Mercurial > hg > graal-jvmci-8
annotate src/share/vm/gc_implementation/g1/g1CollectedHeap.cpp @ 4095:bca17e38de00
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Summary: Select number of GC threads dynamically based on heap usage and number of Java threads
Reviewed-by: johnc, ysr, jcoomes
author | jmasa |
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date | Tue, 09 Aug 2011 10:16:01 -0700 |
parents | a88de71c4e3a |
children | dc467e8b2c5e |
rev | line source |
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342 | 1 /* |
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2 * Copyright (c) 2001, 2011, Oracle and/or its affiliates. All rights reserved. |
342 | 3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
4 * | |
5 * This code is free software; you can redistribute it and/or modify it | |
6 * under the terms of the GNU General Public License version 2 only, as | |
7 * published by the Free Software Foundation. | |
8 * | |
9 * This code is distributed in the hope that it will be useful, but WITHOUT | |
10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or | |
11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License | |
12 * version 2 for more details (a copy is included in the LICENSE file that | |
13 * accompanied this code). | |
14 * | |
15 * You should have received a copy of the GNU General Public License version | |
16 * 2 along with this work; if not, write to the Free Software Foundation, | |
17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. | |
18 * | |
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19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
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20 * or visit www.oracle.com if you need additional information or have any |
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21 * questions. |
342 | 22 * |
23 */ | |
24 | |
1972 | 25 #include "precompiled.hpp" |
26 #include "code/icBuffer.hpp" | |
27 #include "gc_implementation/g1/bufferingOopClosure.hpp" | |
28 #include "gc_implementation/g1/concurrentG1Refine.hpp" | |
29 #include "gc_implementation/g1/concurrentG1RefineThread.hpp" | |
30 #include "gc_implementation/g1/concurrentMarkThread.inline.hpp" | |
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31 #include "gc_implementation/g1/g1AllocRegion.inline.hpp" |
1972 | 32 #include "gc_implementation/g1/g1CollectedHeap.inline.hpp" |
33 #include "gc_implementation/g1/g1CollectorPolicy.hpp" | |
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34 #include "gc_implementation/g1/g1ErgoVerbose.hpp" |
1972 | 35 #include "gc_implementation/g1/g1MarkSweep.hpp" |
36 #include "gc_implementation/g1/g1OopClosures.inline.hpp" | |
37 #include "gc_implementation/g1/g1RemSet.inline.hpp" | |
38 #include "gc_implementation/g1/heapRegionRemSet.hpp" | |
39 #include "gc_implementation/g1/heapRegionSeq.inline.hpp" | |
40 #include "gc_implementation/g1/vm_operations_g1.hpp" | |
41 #include "gc_implementation/shared/isGCActiveMark.hpp" | |
42 #include "memory/gcLocker.inline.hpp" | |
43 #include "memory/genOopClosures.inline.hpp" | |
44 #include "memory/generationSpec.hpp" | |
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45 #include "memory/referenceProcessor.hpp" |
1972 | 46 #include "oops/oop.inline.hpp" |
47 #include "oops/oop.pcgc.inline.hpp" | |
48 #include "runtime/aprofiler.hpp" | |
49 #include "runtime/vmThread.hpp" | |
342 | 50 |
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51 size_t G1CollectedHeap::_humongous_object_threshold_in_words = 0; |
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52 |
342 | 53 // turn it on so that the contents of the young list (scan-only / |
54 // to-be-collected) are printed at "strategic" points before / during | |
55 // / after the collection --- this is useful for debugging | |
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56 #define YOUNG_LIST_VERBOSE 0 |
342 | 57 // CURRENT STATUS |
58 // This file is under construction. Search for "FIXME". | |
59 | |
60 // INVARIANTS/NOTES | |
61 // | |
62 // All allocation activity covered by the G1CollectedHeap interface is | |
1973 | 63 // serialized by acquiring the HeapLock. This happens in mem_allocate |
64 // and allocate_new_tlab, which are the "entry" points to the | |
65 // allocation code from the rest of the JVM. (Note that this does not | |
66 // apply to TLAB allocation, which is not part of this interface: it | |
67 // is done by clients of this interface.) | |
342 | 68 |
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69 // Notes on implementation of parallelism in different tasks. |
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70 // |
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71 // G1ParVerifyTask uses heap_region_par_iterate_chunked() for parallelism. |
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72 // The number of GC workers is passed to heap_region_par_iterate_chunked(). |
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73 // It does use run_task() which sets _n_workers in the task. |
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74 // G1ParTask executes g1_process_strong_roots() -> |
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75 // SharedHeap::process_strong_roots() which calls eventuall to |
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76 // CardTableModRefBS::par_non_clean_card_iterate_work() which uses |
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77 // SequentialSubTasksDone. SharedHeap::process_strong_roots() also |
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78 // directly uses SubTasksDone (_process_strong_tasks field in SharedHeap). |
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79 // |
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80 |
342 | 81 // Local to this file. |
82 | |
83 class RefineCardTableEntryClosure: public CardTableEntryClosure { | |
84 SuspendibleThreadSet* _sts; | |
85 G1RemSet* _g1rs; | |
86 ConcurrentG1Refine* _cg1r; | |
87 bool _concurrent; | |
88 public: | |
89 RefineCardTableEntryClosure(SuspendibleThreadSet* sts, | |
90 G1RemSet* g1rs, | |
91 ConcurrentG1Refine* cg1r) : | |
92 _sts(sts), _g1rs(g1rs), _cg1r(cg1r), _concurrent(true) | |
93 {} | |
94 bool do_card_ptr(jbyte* card_ptr, int worker_i) { | |
1705 | 95 bool oops_into_cset = _g1rs->concurrentRefineOneCard(card_ptr, worker_i, false); |
96 // This path is executed by the concurrent refine or mutator threads, | |
97 // concurrently, and so we do not care if card_ptr contains references | |
98 // that point into the collection set. | |
99 assert(!oops_into_cset, "should be"); | |
100 | |
342 | 101 if (_concurrent && _sts->should_yield()) { |
102 // Caller will actually yield. | |
103 return false; | |
104 } | |
105 // Otherwise, we finished successfully; return true. | |
106 return true; | |
107 } | |
108 void set_concurrent(bool b) { _concurrent = b; } | |
109 }; | |
110 | |
111 | |
112 class ClearLoggedCardTableEntryClosure: public CardTableEntryClosure { | |
113 int _calls; | |
114 G1CollectedHeap* _g1h; | |
115 CardTableModRefBS* _ctbs; | |
116 int _histo[256]; | |
117 public: | |
118 ClearLoggedCardTableEntryClosure() : | |
119 _calls(0) | |
120 { | |
121 _g1h = G1CollectedHeap::heap(); | |
122 _ctbs = (CardTableModRefBS*)_g1h->barrier_set(); | |
123 for (int i = 0; i < 256; i++) _histo[i] = 0; | |
124 } | |
125 bool do_card_ptr(jbyte* card_ptr, int worker_i) { | |
126 if (_g1h->is_in_reserved(_ctbs->addr_for(card_ptr))) { | |
127 _calls++; | |
128 unsigned char* ujb = (unsigned char*)card_ptr; | |
129 int ind = (int)(*ujb); | |
130 _histo[ind]++; | |
131 *card_ptr = -1; | |
132 } | |
133 return true; | |
134 } | |
135 int calls() { return _calls; } | |
136 void print_histo() { | |
137 gclog_or_tty->print_cr("Card table value histogram:"); | |
138 for (int i = 0; i < 256; i++) { | |
139 if (_histo[i] != 0) { | |
140 gclog_or_tty->print_cr(" %d: %d", i, _histo[i]); | |
141 } | |
142 } | |
143 } | |
144 }; | |
145 | |
146 class RedirtyLoggedCardTableEntryClosure: public CardTableEntryClosure { | |
147 int _calls; | |
148 G1CollectedHeap* _g1h; | |
149 CardTableModRefBS* _ctbs; | |
150 public: | |
151 RedirtyLoggedCardTableEntryClosure() : | |
152 _calls(0) | |
153 { | |
154 _g1h = G1CollectedHeap::heap(); | |
155 _ctbs = (CardTableModRefBS*)_g1h->barrier_set(); | |
156 } | |
157 bool do_card_ptr(jbyte* card_ptr, int worker_i) { | |
158 if (_g1h->is_in_reserved(_ctbs->addr_for(card_ptr))) { | |
159 _calls++; | |
160 *card_ptr = 0; | |
161 } | |
162 return true; | |
163 } | |
164 int calls() { return _calls; } | |
165 }; | |
166 | |
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167 class RedirtyLoggedCardTableEntryFastClosure : public CardTableEntryClosure { |
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168 public: |
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169 bool do_card_ptr(jbyte* card_ptr, int worker_i) { |
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170 *card_ptr = CardTableModRefBS::dirty_card_val(); |
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171 return true; |
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172 } |
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173 }; |
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174 |
342 | 175 YoungList::YoungList(G1CollectedHeap* g1h) |
176 : _g1h(g1h), _head(NULL), | |
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177 _length(0), |
342 | 178 _last_sampled_rs_lengths(0), |
545 | 179 _survivor_head(NULL), _survivor_tail(NULL), _survivor_length(0) |
342 | 180 { |
181 guarantee( check_list_empty(false), "just making sure..." ); | |
182 } | |
183 | |
184 void YoungList::push_region(HeapRegion *hr) { | |
185 assert(!hr->is_young(), "should not already be young"); | |
186 assert(hr->get_next_young_region() == NULL, "cause it should!"); | |
187 | |
188 hr->set_next_young_region(_head); | |
189 _head = hr; | |
190 | |
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191 _g1h->g1_policy()->set_region_eden(hr, (int) _length); |
342 | 192 ++_length; |
193 } | |
194 | |
195 void YoungList::add_survivor_region(HeapRegion* hr) { | |
545 | 196 assert(hr->is_survivor(), "should be flagged as survivor region"); |
342 | 197 assert(hr->get_next_young_region() == NULL, "cause it should!"); |
198 | |
199 hr->set_next_young_region(_survivor_head); | |
200 if (_survivor_head == NULL) { | |
545 | 201 _survivor_tail = hr; |
342 | 202 } |
203 _survivor_head = hr; | |
204 ++_survivor_length; | |
205 } | |
206 | |
207 void YoungList::empty_list(HeapRegion* list) { | |
208 while (list != NULL) { | |
209 HeapRegion* next = list->get_next_young_region(); | |
210 list->set_next_young_region(NULL); | |
211 list->uninstall_surv_rate_group(); | |
212 list->set_not_young(); | |
213 list = next; | |
214 } | |
215 } | |
216 | |
217 void YoungList::empty_list() { | |
218 assert(check_list_well_formed(), "young list should be well formed"); | |
219 | |
220 empty_list(_head); | |
221 _head = NULL; | |
222 _length = 0; | |
223 | |
224 empty_list(_survivor_head); | |
225 _survivor_head = NULL; | |
545 | 226 _survivor_tail = NULL; |
342 | 227 _survivor_length = 0; |
228 | |
229 _last_sampled_rs_lengths = 0; | |
230 | |
231 assert(check_list_empty(false), "just making sure..."); | |
232 } | |
233 | |
234 bool YoungList::check_list_well_formed() { | |
235 bool ret = true; | |
236 | |
237 size_t length = 0; | |
238 HeapRegion* curr = _head; | |
239 HeapRegion* last = NULL; | |
240 while (curr != NULL) { | |
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241 if (!curr->is_young()) { |
342 | 242 gclog_or_tty->print_cr("### YOUNG REGION "PTR_FORMAT"-"PTR_FORMAT" " |
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243 "incorrectly tagged (y: %d, surv: %d)", |
342 | 244 curr->bottom(), curr->end(), |
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245 curr->is_young(), curr->is_survivor()); |
342 | 246 ret = false; |
247 } | |
248 ++length; | |
249 last = curr; | |
250 curr = curr->get_next_young_region(); | |
251 } | |
252 ret = ret && (length == _length); | |
253 | |
254 if (!ret) { | |
255 gclog_or_tty->print_cr("### YOUNG LIST seems not well formed!"); | |
256 gclog_or_tty->print_cr("### list has %d entries, _length is %d", | |
257 length, _length); | |
258 } | |
259 | |
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260 return ret; |
342 | 261 } |
262 | |
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263 bool YoungList::check_list_empty(bool check_sample) { |
342 | 264 bool ret = true; |
265 | |
266 if (_length != 0) { | |
267 gclog_or_tty->print_cr("### YOUNG LIST should have 0 length, not %d", | |
268 _length); | |
269 ret = false; | |
270 } | |
271 if (check_sample && _last_sampled_rs_lengths != 0) { | |
272 gclog_or_tty->print_cr("### YOUNG LIST has non-zero last sampled RS lengths"); | |
273 ret = false; | |
274 } | |
275 if (_head != NULL) { | |
276 gclog_or_tty->print_cr("### YOUNG LIST does not have a NULL head"); | |
277 ret = false; | |
278 } | |
279 if (!ret) { | |
280 gclog_or_tty->print_cr("### YOUNG LIST does not seem empty"); | |
281 } | |
282 | |
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283 return ret; |
342 | 284 } |
285 | |
286 void | |
287 YoungList::rs_length_sampling_init() { | |
288 _sampled_rs_lengths = 0; | |
289 _curr = _head; | |
290 } | |
291 | |
292 bool | |
293 YoungList::rs_length_sampling_more() { | |
294 return _curr != NULL; | |
295 } | |
296 | |
297 void | |
298 YoungList::rs_length_sampling_next() { | |
299 assert( _curr != NULL, "invariant" ); | |
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300 size_t rs_length = _curr->rem_set()->occupied(); |
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301 |
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302 _sampled_rs_lengths += rs_length; |
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303 |
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304 // The current region may not yet have been added to the |
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305 // incremental collection set (it gets added when it is |
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306 // retired as the current allocation region). |
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307 if (_curr->in_collection_set()) { |
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308 // Update the collection set policy information for this region |
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309 _g1h->g1_policy()->update_incremental_cset_info(_curr, rs_length); |
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310 } |
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311 |
342 | 312 _curr = _curr->get_next_young_region(); |
313 if (_curr == NULL) { | |
314 _last_sampled_rs_lengths = _sampled_rs_lengths; | |
315 // gclog_or_tty->print_cr("last sampled RS lengths = %d", _last_sampled_rs_lengths); | |
316 } | |
317 } | |
318 | |
319 void | |
320 YoungList::reset_auxilary_lists() { | |
321 guarantee( is_empty(), "young list should be empty" ); | |
322 assert(check_list_well_formed(), "young list should be well formed"); | |
323 | |
324 // Add survivor regions to SurvRateGroup. | |
325 _g1h->g1_policy()->note_start_adding_survivor_regions(); | |
545 | 326 _g1h->g1_policy()->finished_recalculating_age_indexes(true /* is_survivors */); |
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327 |
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328 int young_index_in_cset = 0; |
342 | 329 for (HeapRegion* curr = _survivor_head; |
330 curr != NULL; | |
331 curr = curr->get_next_young_region()) { | |
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332 _g1h->g1_policy()->set_region_survivor(curr, young_index_in_cset); |
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333 |
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334 // The region is a non-empty survivor so let's add it to |
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335 // the incremental collection set for the next evacuation |
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336 // pause. |
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337 _g1h->g1_policy()->add_region_to_incremental_cset_rhs(curr); |
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338 young_index_in_cset += 1; |
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339 } |
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340 assert((size_t) young_index_in_cset == _survivor_length, |
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341 "post-condition"); |
342 | 342 _g1h->g1_policy()->note_stop_adding_survivor_regions(); |
343 | |
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344 _head = _survivor_head; |
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345 _length = _survivor_length; |
342 | 346 if (_survivor_head != NULL) { |
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347 assert(_survivor_tail != NULL, "cause it shouldn't be"); |
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348 assert(_survivor_length > 0, "invariant"); |
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349 _survivor_tail->set_next_young_region(NULL); |
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350 } |
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351 |
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352 // Don't clear the survivor list handles until the start of |
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353 // the next evacuation pause - we need it in order to re-tag |
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354 // the survivor regions from this evacuation pause as 'young' |
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355 // at the start of the next. |
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356 |
545 | 357 _g1h->g1_policy()->finished_recalculating_age_indexes(false /* is_survivors */); |
342 | 358 |
359 assert(check_list_well_formed(), "young list should be well formed"); | |
360 } | |
361 | |
362 void YoungList::print() { | |
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363 HeapRegion* lists[] = {_head, _survivor_head}; |
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364 const char* names[] = {"YOUNG", "SURVIVOR"}; |
342 | 365 |
366 for (unsigned int list = 0; list < ARRAY_SIZE(lists); ++list) { | |
367 gclog_or_tty->print_cr("%s LIST CONTENTS", names[list]); | |
368 HeapRegion *curr = lists[list]; | |
369 if (curr == NULL) | |
370 gclog_or_tty->print_cr(" empty"); | |
371 while (curr != NULL) { | |
372 gclog_or_tty->print_cr(" [%08x-%08x], t: %08x, P: %08x, N: %08x, C: %08x, " | |
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373 "age: %4d, y: %d, surv: %d", |
342 | 374 curr->bottom(), curr->end(), |
375 curr->top(), | |
376 curr->prev_top_at_mark_start(), | |
377 curr->next_top_at_mark_start(), | |
378 curr->top_at_conc_mark_count(), | |
379 curr->age_in_surv_rate_group_cond(), | |
380 curr->is_young(), | |
381 curr->is_survivor()); | |
382 curr = curr->get_next_young_region(); | |
383 } | |
384 } | |
385 | |
386 gclog_or_tty->print_cr(""); | |
387 } | |
388 | |
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389 void G1CollectedHeap::push_dirty_cards_region(HeapRegion* hr) |
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390 { |
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391 // Claim the right to put the region on the dirty cards region list |
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392 // by installing a self pointer. |
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393 HeapRegion* next = hr->get_next_dirty_cards_region(); |
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394 if (next == NULL) { |
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395 HeapRegion* res = (HeapRegion*) |
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396 Atomic::cmpxchg_ptr(hr, hr->next_dirty_cards_region_addr(), |
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397 NULL); |
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398 if (res == NULL) { |
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399 HeapRegion* head; |
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400 do { |
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401 // Put the region to the dirty cards region list. |
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402 head = _dirty_cards_region_list; |
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403 next = (HeapRegion*) |
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404 Atomic::cmpxchg_ptr(hr, &_dirty_cards_region_list, head); |
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405 if (next == head) { |
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406 assert(hr->get_next_dirty_cards_region() == hr, |
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407 "hr->get_next_dirty_cards_region() != hr"); |
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408 if (next == NULL) { |
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409 // The last region in the list points to itself. |
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410 hr->set_next_dirty_cards_region(hr); |
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411 } else { |
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412 hr->set_next_dirty_cards_region(next); |
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413 } |
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414 } |
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415 } while (next != head); |
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416 } |
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417 } |
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418 } |
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419 |
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420 HeapRegion* G1CollectedHeap::pop_dirty_cards_region() |
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421 { |
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422 HeapRegion* head; |
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423 HeapRegion* hr; |
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424 do { |
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425 head = _dirty_cards_region_list; |
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426 if (head == NULL) { |
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427 return NULL; |
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428 } |
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429 HeapRegion* new_head = head->get_next_dirty_cards_region(); |
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430 if (head == new_head) { |
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431 // The last region. |
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432 new_head = NULL; |
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433 } |
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434 hr = (HeapRegion*)Atomic::cmpxchg_ptr(new_head, &_dirty_cards_region_list, |
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435 head); |
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436 } while (hr != head); |
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437 assert(hr != NULL, "invariant"); |
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438 hr->set_next_dirty_cards_region(NULL); |
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439 return hr; |
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440 } |
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441 |
342 | 442 void G1CollectedHeap::stop_conc_gc_threads() { |
794 | 443 _cg1r->stop(); |
342 | 444 _cmThread->stop(); |
445 } | |
446 | |
3377
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447 #ifdef ASSERT |
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448 // A region is added to the collection set as it is retired |
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449 // so an address p can point to a region which will be in the |
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450 // collection set but has not yet been retired. This method |
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451 // therefore is only accurate during a GC pause after all |
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452 // regions have been retired. It is used for debugging |
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453 // to check if an nmethod has references to objects that can |
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454 // be move during a partial collection. Though it can be |
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455 // inaccurate, it is sufficient for G1 because the conservative |
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456 // implementation of is_scavengable() for G1 will indicate that |
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457 // all nmethods must be scanned during a partial collection. |
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458 bool G1CollectedHeap::is_in_partial_collection(const void* p) { |
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459 HeapRegion* hr = heap_region_containing(p); |
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460 return hr != NULL && hr->in_collection_set(); |
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461 } |
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462 #endif |
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463 |
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464 // Returns true if the reference points to an object that |
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465 // can move in an incremental collecction. |
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466 bool G1CollectedHeap::is_scavengable(const void* p) { |
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467 G1CollectedHeap* g1h = G1CollectedHeap::heap(); |
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468 G1CollectorPolicy* g1p = g1h->g1_policy(); |
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469 HeapRegion* hr = heap_region_containing(p); |
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470 if (hr == NULL) { |
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471 // perm gen (or null) |
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472 return false; |
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473 } else { |
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474 return !hr->isHumongous(); |
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475 } |
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476 } |
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477 |
342 | 478 void G1CollectedHeap::check_ct_logs_at_safepoint() { |
479 DirtyCardQueueSet& dcqs = JavaThread::dirty_card_queue_set(); | |
480 CardTableModRefBS* ct_bs = (CardTableModRefBS*)barrier_set(); | |
481 | |
482 // Count the dirty cards at the start. | |
483 CountNonCleanMemRegionClosure count1(this); | |
484 ct_bs->mod_card_iterate(&count1); | |
485 int orig_count = count1.n(); | |
486 | |
487 // First clear the logged cards. | |
488 ClearLoggedCardTableEntryClosure clear; | |
489 dcqs.set_closure(&clear); | |
490 dcqs.apply_closure_to_all_completed_buffers(); | |
491 dcqs.iterate_closure_all_threads(false); | |
492 clear.print_histo(); | |
493 | |
494 // Now ensure that there's no dirty cards. | |
495 CountNonCleanMemRegionClosure count2(this); | |
496 ct_bs->mod_card_iterate(&count2); | |
497 if (count2.n() != 0) { | |
498 gclog_or_tty->print_cr("Card table has %d entries; %d originally", | |
499 count2.n(), orig_count); | |
500 } | |
501 guarantee(count2.n() == 0, "Card table should be clean."); | |
502 | |
503 RedirtyLoggedCardTableEntryClosure redirty; | |
504 JavaThread::dirty_card_queue_set().set_closure(&redirty); | |
505 dcqs.apply_closure_to_all_completed_buffers(); | |
506 dcqs.iterate_closure_all_threads(false); | |
507 gclog_or_tty->print_cr("Log entries = %d, dirty cards = %d.", | |
508 clear.calls(), orig_count); | |
509 guarantee(redirty.calls() == clear.calls(), | |
510 "Or else mechanism is broken."); | |
511 | |
512 CountNonCleanMemRegionClosure count3(this); | |
513 ct_bs->mod_card_iterate(&count3); | |
514 if (count3.n() != orig_count) { | |
515 gclog_or_tty->print_cr("Should have restored them all: orig = %d, final = %d.", | |
516 orig_count, count3.n()); | |
517 guarantee(count3.n() >= orig_count, "Should have restored them all."); | |
518 } | |
519 | |
520 JavaThread::dirty_card_queue_set().set_closure(_refine_cte_cl); | |
521 } | |
522 | |
523 // Private class members. | |
524 | |
525 G1CollectedHeap* G1CollectedHeap::_g1h; | |
526 | |
527 // Private methods. | |
528 | |
2152 | 529 HeapRegion* |
2361 | 530 G1CollectedHeap::new_region_try_secondary_free_list() { |
2152 | 531 MutexLockerEx x(SecondaryFreeList_lock, Mutex::_no_safepoint_check_flag); |
532 while (!_secondary_free_list.is_empty() || free_regions_coming()) { | |
533 if (!_secondary_free_list.is_empty()) { | |
534 if (G1ConcRegionFreeingVerbose) { | |
535 gclog_or_tty->print_cr("G1ConcRegionFreeing [region alloc] : " | |
536 "secondary_free_list has "SIZE_FORMAT" entries", | |
537 _secondary_free_list.length()); | |
538 } | |
539 // It looks as if there are free regions available on the | |
540 // secondary_free_list. Let's move them to the free_list and try | |
541 // again to allocate from it. | |
542 append_secondary_free_list(); | |
543 | |
544 assert(!_free_list.is_empty(), "if the secondary_free_list was not " | |
545 "empty we should have moved at least one entry to the free_list"); | |
546 HeapRegion* res = _free_list.remove_head(); | |
547 if (G1ConcRegionFreeingVerbose) { | |
548 gclog_or_tty->print_cr("G1ConcRegionFreeing [region alloc] : " | |
549 "allocated "HR_FORMAT" from secondary_free_list", | |
550 HR_FORMAT_PARAMS(res)); | |
551 } | |
552 return res; | |
553 } | |
554 | |
555 // Wait here until we get notifed either when (a) there are no | |
556 // more free regions coming or (b) some regions have been moved on | |
557 // the secondary_free_list. | |
558 SecondaryFreeList_lock->wait(Mutex::_no_safepoint_check_flag); | |
559 } | |
560 | |
561 if (G1ConcRegionFreeingVerbose) { | |
562 gclog_or_tty->print_cr("G1ConcRegionFreeing [region alloc] : " | |
563 "could not allocate from secondary_free_list"); | |
564 } | |
565 return NULL; | |
566 } | |
567 | |
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568 HeapRegion* G1CollectedHeap::new_region(size_t word_size, bool do_expand) { |
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569 assert(!isHumongous(word_size) || word_size <= HeapRegion::GrainWords, |
2152 | 570 "the only time we use this to allocate a humongous region is " |
571 "when we are allocating a single humongous region"); | |
572 | |
573 HeapRegion* res; | |
574 if (G1StressConcRegionFreeing) { | |
575 if (!_secondary_free_list.is_empty()) { | |
576 if (G1ConcRegionFreeingVerbose) { | |
577 gclog_or_tty->print_cr("G1ConcRegionFreeing [region alloc] : " | |
578 "forced to look at the secondary_free_list"); | |
579 } | |
2361 | 580 res = new_region_try_secondary_free_list(); |
2152 | 581 if (res != NULL) { |
582 return res; | |
583 } | |
584 } | |
585 } | |
586 res = _free_list.remove_head_or_null(); | |
587 if (res == NULL) { | |
588 if (G1ConcRegionFreeingVerbose) { | |
589 gclog_or_tty->print_cr("G1ConcRegionFreeing [region alloc] : " | |
590 "res == NULL, trying the secondary_free_list"); | |
591 } | |
2361 | 592 res = new_region_try_secondary_free_list(); |
2152 | 593 } |
342 | 594 if (res == NULL && do_expand) { |
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595 ergo_verbose1(ErgoHeapSizing, |
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596 "attempt heap expansion", |
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597 ergo_format_reason("region allocation request failed") |
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598 ergo_format_byte("allocation request"), |
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599 word_size * HeapWordSize); |
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600 if (expand(word_size * HeapWordSize)) { |
3766 | 601 // Even though the heap was expanded, it might not have reached |
602 // the desired size. So, we cannot assume that the allocation | |
603 // will succeed. | |
604 res = _free_list.remove_head_or_null(); | |
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605 } |
342 | 606 } |
607 return res; | |
608 } | |
609 | |
3766 | 610 size_t G1CollectedHeap::humongous_obj_allocate_find_first(size_t num_regions, |
611 size_t word_size) { | |
2361 | 612 assert(isHumongous(word_size), "word_size should be humongous"); |
613 assert(num_regions * HeapRegion::GrainWords >= word_size, "pre-condition"); | |
614 | |
3766 | 615 size_t first = G1_NULL_HRS_INDEX; |
2152 | 616 if (num_regions == 1) { |
617 // Only one region to allocate, no need to go through the slower | |
618 // path. The caller will attempt the expasion if this fails, so | |
619 // let's not try to expand here too. | |
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620 HeapRegion* hr = new_region(word_size, false /* do_expand */); |
2152 | 621 if (hr != NULL) { |
622 first = hr->hrs_index(); | |
623 } else { | |
3766 | 624 first = G1_NULL_HRS_INDEX; |
2152 | 625 } |
626 } else { | |
627 // We can't allocate humongous regions while cleanupComplete() is | |
628 // running, since some of the regions we find to be empty might not | |
629 // yet be added to the free list and it is not straightforward to | |
630 // know which list they are on so that we can remove them. Note | |
631 // that we only need to do this if we need to allocate more than | |
632 // one region to satisfy the current humongous allocation | |
633 // request. If we are only allocating one region we use the common | |
634 // region allocation code (see above). | |
635 wait_while_free_regions_coming(); | |
2361 | 636 append_secondary_free_list_if_not_empty_with_lock(); |
2152 | 637 |
638 if (free_regions() >= num_regions) { | |
3766 | 639 first = _hrs.find_contiguous(num_regions); |
640 if (first != G1_NULL_HRS_INDEX) { | |
641 for (size_t i = first; i < first + num_regions; ++i) { | |
642 HeapRegion* hr = region_at(i); | |
2152 | 643 assert(hr->is_empty(), "sanity"); |
2361 | 644 assert(is_on_master_free_list(hr), "sanity"); |
2152 | 645 hr->set_pending_removal(true); |
646 } | |
647 _free_list.remove_all_pending(num_regions); | |
648 } | |
649 } | |
650 } | |
651 return first; | |
652 } | |
653 | |
2361 | 654 HeapWord* |
3766 | 655 G1CollectedHeap::humongous_obj_allocate_initialize_regions(size_t first, |
2361 | 656 size_t num_regions, |
657 size_t word_size) { | |
3766 | 658 assert(first != G1_NULL_HRS_INDEX, "pre-condition"); |
2361 | 659 assert(isHumongous(word_size), "word_size should be humongous"); |
660 assert(num_regions * HeapRegion::GrainWords >= word_size, "pre-condition"); | |
661 | |
662 // Index of last region in the series + 1. | |
3766 | 663 size_t last = first + num_regions; |
2361 | 664 |
665 // We need to initialize the region(s) we just discovered. This is | |
666 // a bit tricky given that it can happen concurrently with | |
667 // refinement threads refining cards on these regions and | |
668 // potentially wanting to refine the BOT as they are scanning | |
669 // those cards (this can happen shortly after a cleanup; see CR | |
670 // 6991377). So we have to set up the region(s) carefully and in | |
671 // a specific order. | |
672 | |
673 // The word size sum of all the regions we will allocate. | |
674 size_t word_size_sum = num_regions * HeapRegion::GrainWords; | |
675 assert(word_size <= word_size_sum, "sanity"); | |
676 | |
677 // This will be the "starts humongous" region. | |
3766 | 678 HeapRegion* first_hr = region_at(first); |
2361 | 679 // The header of the new object will be placed at the bottom of |
680 // the first region. | |
681 HeapWord* new_obj = first_hr->bottom(); | |
682 // This will be the new end of the first region in the series that | |
683 // should also match the end of the last region in the seriers. | |
684 HeapWord* new_end = new_obj + word_size_sum; | |
685 // This will be the new top of the first region that will reflect | |
686 // this allocation. | |
687 HeapWord* new_top = new_obj + word_size; | |
688 | |
689 // First, we need to zero the header of the space that we will be | |
690 // allocating. When we update top further down, some refinement | |
691 // threads might try to scan the region. By zeroing the header we | |
692 // ensure that any thread that will try to scan the region will | |
693 // come across the zero klass word and bail out. | |
694 // | |
695 // NOTE: It would not have been correct to have used | |
696 // CollectedHeap::fill_with_object() and make the space look like | |
697 // an int array. The thread that is doing the allocation will | |
698 // later update the object header to a potentially different array | |
699 // type and, for a very short period of time, the klass and length | |
700 // fields will be inconsistent. This could cause a refinement | |
701 // thread to calculate the object size incorrectly. | |
702 Copy::fill_to_words(new_obj, oopDesc::header_size(), 0); | |
703 | |
704 // We will set up the first region as "starts humongous". This | |
705 // will also update the BOT covering all the regions to reflect | |
706 // that there is a single object that starts at the bottom of the | |
707 // first region. | |
708 first_hr->set_startsHumongous(new_top, new_end); | |
709 | |
710 // Then, if there are any, we will set up the "continues | |
711 // humongous" regions. | |
712 HeapRegion* hr = NULL; | |
3766 | 713 for (size_t i = first + 1; i < last; ++i) { |
714 hr = region_at(i); | |
2361 | 715 hr->set_continuesHumongous(first_hr); |
716 } | |
717 // If we have "continues humongous" regions (hr != NULL), then the | |
718 // end of the last one should match new_end. | |
719 assert(hr == NULL || hr->end() == new_end, "sanity"); | |
720 | |
721 // Up to this point no concurrent thread would have been able to | |
722 // do any scanning on any region in this series. All the top | |
723 // fields still point to bottom, so the intersection between | |
724 // [bottom,top] and [card_start,card_end] will be empty. Before we | |
725 // update the top fields, we'll do a storestore to make sure that | |
726 // no thread sees the update to top before the zeroing of the | |
727 // object header and the BOT initialization. | |
728 OrderAccess::storestore(); | |
729 | |
730 // Now that the BOT and the object header have been initialized, | |
731 // we can update top of the "starts humongous" region. | |
732 assert(first_hr->bottom() < new_top && new_top <= first_hr->end(), | |
733 "new_top should be in this region"); | |
734 first_hr->set_top(new_top); | |
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735 if (_hr_printer.is_active()) { |
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736 HeapWord* bottom = first_hr->bottom(); |
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737 HeapWord* end = first_hr->orig_end(); |
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738 if ((first + 1) == last) { |
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739 // the series has a single humongous region |
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740 _hr_printer.alloc(G1HRPrinter::SingleHumongous, first_hr, new_top); |
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741 } else { |
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742 // the series has more than one humongous regions |
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743 _hr_printer.alloc(G1HRPrinter::StartsHumongous, first_hr, end); |
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744 } |
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745 } |
2361 | 746 |
747 // Now, we will update the top fields of the "continues humongous" | |
748 // regions. The reason we need to do this is that, otherwise, | |
749 // these regions would look empty and this will confuse parts of | |
750 // G1. For example, the code that looks for a consecutive number | |
751 // of empty regions will consider them empty and try to | |
752 // re-allocate them. We can extend is_empty() to also include | |
753 // !continuesHumongous(), but it is easier to just update the top | |
754 // fields here. The way we set top for all regions (i.e., top == | |
755 // end for all regions but the last one, top == new_top for the | |
756 // last one) is actually used when we will free up the humongous | |
757 // region in free_humongous_region(). | |
758 hr = NULL; | |
3766 | 759 for (size_t i = first + 1; i < last; ++i) { |
760 hr = region_at(i); | |
2361 | 761 if ((i + 1) == last) { |
762 // last continues humongous region | |
763 assert(hr->bottom() < new_top && new_top <= hr->end(), | |
764 "new_top should fall on this region"); | |
765 hr->set_top(new_top); | |
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766 _hr_printer.alloc(G1HRPrinter::ContinuesHumongous, hr, new_top); |
2361 | 767 } else { |
768 // not last one | |
769 assert(new_top > hr->end(), "new_top should be above this region"); | |
770 hr->set_top(hr->end()); | |
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771 _hr_printer.alloc(G1HRPrinter::ContinuesHumongous, hr, hr->end()); |
2361 | 772 } |
773 } | |
774 // If we have continues humongous regions (hr != NULL), then the | |
775 // end of the last one should match new_end and its top should | |
776 // match new_top. | |
777 assert(hr == NULL || | |
778 (hr->end() == new_end && hr->top() == new_top), "sanity"); | |
779 | |
780 assert(first_hr->used() == word_size * HeapWordSize, "invariant"); | |
781 _summary_bytes_used += first_hr->used(); | |
782 _humongous_set.add(first_hr); | |
783 | |
784 return new_obj; | |
785 } | |
786 | |
342 | 787 // If could fit into free regions w/o expansion, try. |
788 // Otherwise, if can expand, do so. | |
789 // Otherwise, if using ex regions might help, try with ex given back. | |
1973 | 790 HeapWord* G1CollectedHeap::humongous_obj_allocate(size_t word_size) { |
2152 | 791 assert_heap_locked_or_at_safepoint(true /* should_be_vm_thread */); |
792 | |
793 verify_region_sets_optional(); | |
342 | 794 |
795 size_t num_regions = | |
1973 | 796 round_to(word_size, HeapRegion::GrainWords) / HeapRegion::GrainWords; |
342 | 797 size_t x_size = expansion_regions(); |
3766 | 798 size_t fs = _hrs.free_suffix(); |
799 size_t first = humongous_obj_allocate_find_first(num_regions, word_size); | |
800 if (first == G1_NULL_HRS_INDEX) { | |
2152 | 801 // The only thing we can do now is attempt expansion. |
342 | 802 if (fs + x_size >= num_regions) { |
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803 // If the number of regions we're trying to allocate for this |
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804 // object is at most the number of regions in the free suffix, |
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805 // then the call to humongous_obj_allocate_find_first() above |
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806 // should have succeeded and we wouldn't be here. |
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807 // |
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808 // We should only be trying to expand when the free suffix is |
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809 // not sufficient for the object _and_ we have some expansion |
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810 // room available. |
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811 assert(num_regions > fs, "earlier allocation should have succeeded"); |
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812 |
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813 ergo_verbose1(ErgoHeapSizing, |
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814 "attempt heap expansion", |
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815 ergo_format_reason("humongous allocation request failed") |
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816 ergo_format_byte("allocation request"), |
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817 word_size * HeapWordSize); |
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818 if (expand((num_regions - fs) * HeapRegion::GrainBytes)) { |
3766 | 819 // Even though the heap was expanded, it might not have |
820 // reached the desired size. So, we cannot assume that the | |
821 // allocation will succeed. | |
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822 first = humongous_obj_allocate_find_first(num_regions, word_size); |
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823 } |
2152 | 824 } |
825 } | |
826 | |
2361 | 827 HeapWord* result = NULL; |
3766 | 828 if (first != G1_NULL_HRS_INDEX) { |
2361 | 829 result = |
830 humongous_obj_allocate_initialize_regions(first, num_regions, word_size); | |
831 assert(result != NULL, "it should always return a valid result"); | |
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832 |
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833 // A successful humongous object allocation changes the used space |
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834 // information of the old generation so we need to recalculate the |
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835 // sizes and update the jstat counters here. |
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836 g1mm()->update_sizes(); |
2152 | 837 } |
838 | |
839 verify_region_sets_optional(); | |
2361 | 840 |
841 return result; | |
342 | 842 } |
843 | |
1973 | 844 HeapWord* G1CollectedHeap::allocate_new_tlab(size_t word_size) { |
845 assert_heap_not_locked_and_not_at_safepoint(); | |
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846 assert(!isHumongous(word_size), "we do not allow humongous TLABs"); |
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847 |
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848 unsigned int dummy_gc_count_before; |
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849 return attempt_allocation(word_size, &dummy_gc_count_before); |
342 | 850 } |
851 | |
852 HeapWord* | |
853 G1CollectedHeap::mem_allocate(size_t word_size, | |
1973 | 854 bool* gc_overhead_limit_was_exceeded) { |
855 assert_heap_not_locked_and_not_at_safepoint(); | |
342 | 856 |
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857 // Loop until the allocation is satisified, or unsatisfied after GC. |
1973 | 858 for (int try_count = 1; /* we'll return */; try_count += 1) { |
859 unsigned int gc_count_before; | |
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860 |
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861 HeapWord* result = NULL; |
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862 if (!isHumongous(word_size)) { |
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863 result = attempt_allocation(word_size, &gc_count_before); |
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864 } else { |
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865 result = attempt_allocation_humongous(word_size, &gc_count_before); |
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866 } |
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867 if (result != NULL) { |
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868 return result; |
342 | 869 } |
870 | |
871 // Create the garbage collection operation... | |
1973 | 872 VM_G1CollectForAllocation op(gc_count_before, word_size); |
342 | 873 // ...and get the VM thread to execute it. |
874 VMThread::execute(&op); | |
1973 | 875 |
876 if (op.prologue_succeeded() && op.pause_succeeded()) { | |
877 // If the operation was successful we'll return the result even | |
878 // if it is NULL. If the allocation attempt failed immediately | |
879 // after a Full GC, it's unlikely we'll be able to allocate now. | |
880 HeapWord* result = op.result(); | |
881 if (result != NULL && !isHumongous(word_size)) { | |
882 // Allocations that take place on VM operations do not do any | |
883 // card dirtying and we have to do it here. We only have to do | |
884 // this for non-humongous allocations, though. | |
885 dirty_young_block(result, word_size); | |
886 } | |
342 | 887 return result; |
1973 | 888 } else { |
889 assert(op.result() == NULL, | |
890 "the result should be NULL if the VM op did not succeed"); | |
342 | 891 } |
892 | |
893 // Give a warning if we seem to be looping forever. | |
894 if ((QueuedAllocationWarningCount > 0) && | |
895 (try_count % QueuedAllocationWarningCount == 0)) { | |
1973 | 896 warning("G1CollectedHeap::mem_allocate retries %d times", try_count); |
342 | 897 } |
898 } | |
1973 | 899 |
900 ShouldNotReachHere(); | |
2433
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901 return NULL; |
342 | 902 } |
903 | |
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904 HeapWord* G1CollectedHeap::attempt_allocation_slow(size_t word_size, |
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905 unsigned int *gc_count_before_ret) { |
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906 // Make sure you read the note in attempt_allocation_humongous(). |
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907 |
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908 assert_heap_not_locked_and_not_at_safepoint(); |
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909 assert(!isHumongous(word_size), "attempt_allocation_slow() should not " |
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910 "be called for humongous allocation requests"); |
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911 |
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912 // We should only get here after the first-level allocation attempt |
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913 // (attempt_allocation()) failed to allocate. |
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914 |
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915 // We will loop until a) we manage to successfully perform the |
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916 // allocation or b) we successfully schedule a collection which |
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917 // fails to perform the allocation. b) is the only case when we'll |
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918 // return NULL. |
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919 HeapWord* result = NULL; |
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920 for (int try_count = 1; /* we'll return */; try_count += 1) { |
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921 bool should_try_gc; |
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922 unsigned int gc_count_before; |
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923 |
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924 { |
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925 MutexLockerEx x(Heap_lock); |
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926 |
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927 result = _mutator_alloc_region.attempt_allocation_locked(word_size, |
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928 false /* bot_updates */); |
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929 if (result != NULL) { |
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930 return result; |
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931 } |
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932 |
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933 // If we reach here, attempt_allocation_locked() above failed to |
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934 // allocate a new region. So the mutator alloc region should be NULL. |
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935 assert(_mutator_alloc_region.get() == NULL, "only way to get here"); |
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936 |
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937 if (GC_locker::is_active_and_needs_gc()) { |
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938 if (g1_policy()->can_expand_young_list()) { |
3914
20213c8a3c40
7050392: G1: Introduce flag to generate a log of the G1 ergonomic decisions
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939 // No need for an ergo verbose message here, |
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940 // can_expand_young_list() does this when it returns true. |
2433
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941 result = _mutator_alloc_region.attempt_allocation_force(word_size, |
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942 false /* bot_updates */); |
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943 if (result != NULL) { |
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|
944 return result; |
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|
945 } |
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|
946 } |
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|
947 should_try_gc = false; |
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|
948 } else { |
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949 // Read the GC count while still holding the Heap_lock. |
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950 gc_count_before = SharedHeap::heap()->total_collections(); |
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951 should_try_gc = true; |
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|
952 } |
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|
953 } |
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|
954 |
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955 if (should_try_gc) { |
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|
956 bool succeeded; |
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957 result = do_collection_pause(word_size, gc_count_before, &succeeded); |
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958 if (result != NULL) { |
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959 assert(succeeded, "only way to get back a non-NULL result"); |
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|
960 return result; |
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|
961 } |
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|
962 |
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|
963 if (succeeded) { |
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964 // If we get here we successfully scheduled a collection which |
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965 // failed to allocate. No point in trying to allocate |
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|
966 // further. We'll just return NULL. |
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|
967 MutexLockerEx x(Heap_lock); |
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968 *gc_count_before_ret = SharedHeap::heap()->total_collections(); |
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969 return NULL; |
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|
970 } |
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|
971 } else { |
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|
972 GC_locker::stall_until_clear(); |
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|
973 } |
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|
974 |
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975 // We can reach here if we were unsuccessul in scheduling a |
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|
976 // collection (because another thread beat us to it) or if we were |
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|
977 // stalled due to the GC locker. In either can we should retry the |
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|
978 // allocation attempt in case another thread successfully |
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979 // performed a collection and reclaimed enough space. We do the |
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|
980 // first attempt (without holding the Heap_lock) here and the |
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|
981 // follow-on attempt will be at the start of the next loop |
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|
982 // iteration (after taking the Heap_lock). |
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983 result = _mutator_alloc_region.attempt_allocation(word_size, |
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|
984 false /* bot_updates */); |
abdfc822206f
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|
985 if (result != NULL ){ |
abdfc822206f
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|
986 return result; |
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|
987 } |
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|
988 |
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|
989 // Give a warning if we seem to be looping forever. |
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990 if ((QueuedAllocationWarningCount > 0) && |
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991 (try_count % QueuedAllocationWarningCount == 0)) { |
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992 warning("G1CollectedHeap::attempt_allocation_slow() " |
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993 "retries %d times", try_count); |
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|
994 } |
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|
995 } |
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|
996 |
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|
997 ShouldNotReachHere(); |
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|
998 return NULL; |
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|
999 } |
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|
1000 |
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1001 HeapWord* G1CollectedHeap::attempt_allocation_humongous(size_t word_size, |
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1002 unsigned int * gc_count_before_ret) { |
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1003 // The structure of this method has a lot of similarities to |
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|
1004 // attempt_allocation_slow(). The reason these two were not merged |
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1005 // into a single one is that such a method would require several "if |
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1006 // allocation is not humongous do this, otherwise do that" |
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|
1007 // conditional paths which would obscure its flow. In fact, an early |
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1008 // version of this code did use a unified method which was harder to |
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1009 // follow and, as a result, it had subtle bugs that were hard to |
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1010 // track down. So keeping these two methods separate allows each to |
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1011 // be more readable. It will be good to keep these two in sync as |
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1012 // much as possible. |
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|
1013 |
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|
1014 assert_heap_not_locked_and_not_at_safepoint(); |
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1015 assert(isHumongous(word_size), "attempt_allocation_humongous() " |
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1016 "should only be called for humongous allocations"); |
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|
1017 |
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1018 // We will loop until a) we manage to successfully perform the |
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1019 // allocation or b) we successfully schedule a collection which |
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1020 // fails to perform the allocation. b) is the only case when we'll |
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1021 // return NULL. |
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1022 HeapWord* result = NULL; |
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1023 for (int try_count = 1; /* we'll return */; try_count += 1) { |
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1024 bool should_try_gc; |
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1025 unsigned int gc_count_before; |
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1026 |
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1027 { |
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1028 MutexLockerEx x(Heap_lock); |
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1029 |
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1030 // Given that humongous objects are not allocated in young |
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1031 // regions, we'll first try to do the allocation without doing a |
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1032 // collection hoping that there's enough space in the heap. |
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1033 result = humongous_obj_allocate(word_size); |
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1034 if (result != NULL) { |
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1035 return result; |
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1036 } |
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1037 |
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1038 if (GC_locker::is_active_and_needs_gc()) { |
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1039 should_try_gc = false; |
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1040 } else { |
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1041 // Read the GC count while still holding the Heap_lock. |
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1042 gc_count_before = SharedHeap::heap()->total_collections(); |
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1043 should_try_gc = true; |
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1044 } |
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1045 } |
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1046 |
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1047 if (should_try_gc) { |
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1048 // If we failed to allocate the humongous object, we should try to |
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1049 // do a collection pause (if we're allowed) in case it reclaims |
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1050 // enough space for the allocation to succeed after the pause. |
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1051 |
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1052 bool succeeded; |
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1053 result = do_collection_pause(word_size, gc_count_before, &succeeded); |
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1054 if (result != NULL) { |
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1055 assert(succeeded, "only way to get back a non-NULL result"); |
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1056 return result; |
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1057 } |
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1058 |
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1059 if (succeeded) { |
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1060 // If we get here we successfully scheduled a collection which |
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1061 // failed to allocate. No point in trying to allocate |
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1062 // further. We'll just return NULL. |
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1063 MutexLockerEx x(Heap_lock); |
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1064 *gc_count_before_ret = SharedHeap::heap()->total_collections(); |
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1065 return NULL; |
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1066 } |
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1067 } else { |
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1068 GC_locker::stall_until_clear(); |
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1069 } |
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1070 |
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1071 // We can reach here if we were unsuccessul in scheduling a |
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1072 // collection (because another thread beat us to it) or if we were |
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1073 // stalled due to the GC locker. In either can we should retry the |
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1074 // allocation attempt in case another thread successfully |
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1075 // performed a collection and reclaimed enough space. Give a |
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1076 // warning if we seem to be looping forever. |
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1077 |
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1078 if ((QueuedAllocationWarningCount > 0) && |
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1079 (try_count % QueuedAllocationWarningCount == 0)) { |
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1080 warning("G1CollectedHeap::attempt_allocation_humongous() " |
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1081 "retries %d times", try_count); |
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1082 } |
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1083 } |
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1084 |
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1085 ShouldNotReachHere(); |
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1086 return NULL; |
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1087 } |
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1088 |
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1089 HeapWord* G1CollectedHeap::attempt_allocation_at_safepoint(size_t word_size, |
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1090 bool expect_null_mutator_alloc_region) { |
2152 | 1091 assert_at_safepoint(true /* should_be_vm_thread */); |
2433
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1092 assert(_mutator_alloc_region.get() == NULL || |
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1093 !expect_null_mutator_alloc_region, |
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1094 "the current alloc region was unexpectedly found to be non-NULL"); |
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1095 |
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1096 if (!isHumongous(word_size)) { |
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1097 return _mutator_alloc_region.attempt_allocation_locked(word_size, |
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1098 false /* bot_updates */); |
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1099 } else { |
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1100 return humongous_obj_allocate(word_size); |
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1101 } |
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1102 |
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1103 ShouldNotReachHere(); |
342 | 1104 } |
1105 | |
1106 class PostMCRemSetClearClosure: public HeapRegionClosure { | |
1107 ModRefBarrierSet* _mr_bs; | |
1108 public: | |
1109 PostMCRemSetClearClosure(ModRefBarrierSet* mr_bs) : _mr_bs(mr_bs) {} | |
1110 bool doHeapRegion(HeapRegion* r) { | |
1111 r->reset_gc_time_stamp(); | |
1112 if (r->continuesHumongous()) | |
1113 return false; | |
1114 HeapRegionRemSet* hrrs = r->rem_set(); | |
1115 if (hrrs != NULL) hrrs->clear(); | |
1116 // You might think here that we could clear just the cards | |
1117 // corresponding to the used region. But no: if we leave a dirty card | |
1118 // in a region we might allocate into, then it would prevent that card | |
1119 // from being enqueued, and cause it to be missed. | |
1120 // Re: the performance cost: we shouldn't be doing full GC anyway! | |
1121 _mr_bs->clear(MemRegion(r->bottom(), r->end())); | |
1122 return false; | |
1123 } | |
1124 }; | |
1125 | |
1126 | |
1127 class PostMCRemSetInvalidateClosure: public HeapRegionClosure { | |
1128 ModRefBarrierSet* _mr_bs; | |
1129 public: | |
1130 PostMCRemSetInvalidateClosure(ModRefBarrierSet* mr_bs) : _mr_bs(mr_bs) {} | |
1131 bool doHeapRegion(HeapRegion* r) { | |
1132 if (r->continuesHumongous()) return false; | |
1133 if (r->used_region().word_size() != 0) { | |
1134 _mr_bs->invalidate(r->used_region(), true /*whole heap*/); | |
1135 } | |
1136 return false; | |
1137 } | |
1138 }; | |
1139 | |
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1140 class RebuildRSOutOfRegionClosure: public HeapRegionClosure { |
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1141 G1CollectedHeap* _g1h; |
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1142 UpdateRSOopClosure _cl; |
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1143 int _worker_i; |
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1144 public: |
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1145 RebuildRSOutOfRegionClosure(G1CollectedHeap* g1, int worker_i = 0) : |
1861 | 1146 _cl(g1->g1_rem_set(), worker_i), |
626
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1147 _worker_i(worker_i), |
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1148 _g1h(g1) |
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1149 { } |
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1150 |
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1151 bool doHeapRegion(HeapRegion* r) { |
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1152 if (!r->continuesHumongous()) { |
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1153 _cl.set_from(r); |
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1154 r->oop_iterate(&_cl); |
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1155 } |
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1156 return false; |
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1157 } |
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1158 }; |
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1159 |
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1160 class ParRebuildRSTask: public AbstractGangTask { |
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1161 G1CollectedHeap* _g1; |
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1162 public: |
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1163 ParRebuildRSTask(G1CollectedHeap* g1) |
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1164 : AbstractGangTask("ParRebuildRSTask"), |
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1165 _g1(g1) |
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1166 { } |
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1167 |
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1168 void work(int i) { |
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1169 RebuildRSOutOfRegionClosure rebuild_rs(_g1, i); |
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1170 _g1->heap_region_par_iterate_chunked(&rebuild_rs, i, |
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1171 _g1->workers()->active_workers(), |
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1172 HeapRegion::RebuildRSClaimValue); |
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1173 } |
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1174 }; |
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1175 |
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1176 class PostCompactionPrinterClosure: public HeapRegionClosure { |
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1177 private: |
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1178 G1HRPrinter* _hr_printer; |
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1179 public: |
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1180 bool doHeapRegion(HeapRegion* hr) { |
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1181 assert(!hr->is_young(), "not expecting to find young regions"); |
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1182 // We only generate output for non-empty regions. |
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1183 if (!hr->is_empty()) { |
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1184 if (!hr->isHumongous()) { |
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1185 _hr_printer->post_compaction(hr, G1HRPrinter::Old); |
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1186 } else if (hr->startsHumongous()) { |
3986
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1187 if (hr->capacity() == HeapRegion::GrainBytes) { |
3778
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1188 // single humongous region |
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1189 _hr_printer->post_compaction(hr, G1HRPrinter::SingleHumongous); |
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1190 } else { |
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1191 _hr_printer->post_compaction(hr, G1HRPrinter::StartsHumongous); |
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1192 } |
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1193 } else { |
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1194 assert(hr->continuesHumongous(), "only way to get here"); |
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1195 _hr_printer->post_compaction(hr, G1HRPrinter::ContinuesHumongous); |
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1196 } |
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1197 } |
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1198 return false; |
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1199 } |
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1200 |
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1201 PostCompactionPrinterClosure(G1HRPrinter* hr_printer) |
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1202 : _hr_printer(hr_printer) { } |
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1203 }; |
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1204 |
1973 | 1205 bool G1CollectedHeap::do_collection(bool explicit_gc, |
1656
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1206 bool clear_all_soft_refs, |
342 | 1207 size_t word_size) { |
2152 | 1208 assert_at_safepoint(true /* should_be_vm_thread */); |
1209 | |
1359
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1210 if (GC_locker::check_active_before_gc()) { |
1973 | 1211 return false; |
1359
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1212 } |
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1213 |
2125
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1214 SvcGCMarker sgcm(SvcGCMarker::FULL); |
342 | 1215 ResourceMark rm; |
1216 | |
838
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1217 if (PrintHeapAtGC) { |
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1218 Universe::print_heap_before_gc(); |
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1219 } |
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1220 |
4072 | 1221 HRSPhaseSetter x(HRSPhaseFullGC); |
2152 | 1222 verify_region_sets_optional(); |
342 | 1223 |
1387
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1224 const bool do_clear_all_soft_refs = clear_all_soft_refs || |
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1225 collector_policy()->should_clear_all_soft_refs(); |
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1226 |
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1227 ClearedAllSoftRefs casr(do_clear_all_soft_refs, collector_policy()); |
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1228 |
342 | 1229 { |
1230 IsGCActiveMark x; | |
1231 | |
1232 // Timing | |
1656
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1233 bool system_gc = (gc_cause() == GCCause::_java_lang_system_gc); |
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1234 assert(!system_gc || explicit_gc, "invariant"); |
342 | 1235 gclog_or_tty->date_stamp(PrintGC && PrintGCDateStamps); |
1236 TraceCPUTime tcpu(PrintGCDetails, true, gclog_or_tty); | |
1656
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1237 TraceTime t(system_gc ? "Full GC (System.gc())" : "Full GC", |
1387
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1238 PrintGC, true, gclog_or_tty); |
342 | 1239 |
3289
b52782ae3880
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|
1240 TraceCollectorStats tcs(g1mm()->full_collection_counters()); |
3356
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7036199: Adding a notification to the implementation of GarbageCollectorMXBeans
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1241 TraceMemoryManagerStats tms(true /* fullGC */, gc_cause()); |
1089
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|
1242 |
342 | 1243 double start = os::elapsedTime(); |
1244 g1_policy()->record_full_collection_start(); | |
1245 | |
2152 | 1246 wait_while_free_regions_coming(); |
2361 | 1247 append_secondary_free_list_if_not_empty_with_lock(); |
2152 | 1248 |
342 | 1249 gc_prologue(true); |
838
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1250 increment_total_collections(true /* full gc */); |
342 | 1251 |
1252 size_t g1h_prev_used = used(); | |
1253 assert(used() == recalculate_used(), "Should be equal"); | |
1254 | |
1255 if (VerifyBeforeGC && total_collections() >= VerifyGCStartAt) { | |
1256 HandleMark hm; // Discard invalid handles created during verification | |
2433
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1257 gclog_or_tty->print(" VerifyBeforeGC:"); |
342 | 1258 prepare_for_verify(); |
3772
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1259 Universe::verify(/* allow dirty */ true, |
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1260 /* silent */ false, |
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1261 /* option */ VerifyOption_G1UsePrevMarking); |
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|
1262 |
342 | 1263 } |
3869
7f776886a215
6810861: G1: support -XX:+{PrintClassHistogram,HeapDump}{Before,After}FullGC
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|
1264 pre_full_gc_dump(); |
342 | 1265 |
1266 COMPILER2_PRESENT(DerivedPointerTable::clear()); | |
1267 | |
3979
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1268 // Disable discovery and empty the discovered lists |
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1269 // for the CM ref processor. |
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1270 ref_processor_cm()->disable_discovery(); |
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1271 ref_processor_cm()->abandon_partial_discovery(); |
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|
1272 ref_processor_cm()->verify_no_references_recorded(); |
342 | 1273 |
1274 // Abandon current iterations of concurrent marking and concurrent | |
1275 // refinement, if any are in progress. | |
1276 concurrent_mark()->abort(); | |
1277 | |
1278 // Make sure we'll choose a new allocation region afterwards. | |
2433
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|
1279 release_mutator_alloc_region(); |
636 | 1280 abandon_gc_alloc_regions(); |
1861 | 1281 g1_rem_set()->cleanupHRRS(); |
1394
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|
1282 |
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1283 // We should call this after we retire any currently active alloc |
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1284 // regions so that all the ALLOC / RETIRE events are generated |
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1285 // before the start GC event. |
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1286 _hr_printer.start_gc(true /* full */, (size_t) total_collections()); |
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1287 |
1394
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1288 // We may have added regions to the current incremental collection |
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1289 // set between the last GC or pause and now. We need to clear the |
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|
1290 // incremental collection set and then start rebuilding it afresh |
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|
1291 // after this full GC. |
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|
1292 abandon_collection_set(g1_policy()->inc_cset_head()); |
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|
1293 g1_policy()->clear_incremental_cset(); |
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|
1294 g1_policy()->stop_incremental_cset_building(); |
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|
1295 |
4072 | 1296 tear_down_region_sets(false /* free_list_only */); |
3867
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1297 g1_policy()->set_full_young_gcs(true); |
342 | 1298 |
3979
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1299 // See the comments in g1CollectedHeap.hpp and |
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1300 // G1CollectedHeap::ref_processing_init() about |
1974
fd1d227ef1b9
6983204: G1: Nightly test nsk/regression/b4958615 failing with +ExplicitGCInvokesConcurrent
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1973
diff
changeset
|
1301 // how reference processing currently works in G1. |
fd1d227ef1b9
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1973
diff
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|
1302 |
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1303 // Temporarily make discovery by the STW ref processor single threaded (non-MT). |
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|
1304 ReferenceProcessorMTDiscoveryMutator stw_rp_disc_ser(ref_processor_stw(), false); |
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1305 |
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1306 // Temporarily clear the STW ref processor's _is_alive_non_header field. |
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|
1307 ReferenceProcessorIsAliveMutator stw_rp_is_alive_null(ref_processor_stw(), NULL); |
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|
1308 |
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|
1309 ref_processor_stw()->enable_discovery(true /*verify_disabled*/, true /*verify_no_refs*/); |
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1310 ref_processor_stw()->setup_policy(do_clear_all_soft_refs); |
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1311 |
342 | 1312 // Do collection work |
1313 { | |
1314 HandleMark hm; // Discard invalid handles created during gc | |
3979
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|
1315 G1MarkSweep::invoke_at_safepoint(ref_processor_stw(), do_clear_all_soft_refs); |
342 | 1316 } |
3979
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|
1317 |
2152 | 1318 assert(free_regions() == 0, "we should not have added any free regions"); |
4072 | 1319 rebuild_region_sets(false /* free_list_only */); |
342 | 1320 |
3979
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1321 // Enqueue any discovered reference objects that have |
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1322 // not been removed from the discovered lists. |
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|
1323 ref_processor_stw()->enqueue_discovered_references(); |
342 | 1324 |
1325 COMPILER2_PRESENT(DerivedPointerTable::update_pointers()); | |
1326 | |
1089
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|
1327 MemoryService::track_memory_usage(); |
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|
1328 |
342 | 1329 if (VerifyAfterGC && total_collections() >= VerifyGCStartAt) { |
1330 HandleMark hm; // Discard invalid handles created during verification | |
1331 gclog_or_tty->print(" VerifyAfterGC:"); | |
637
25e146966e7c
6817419: G1: Enable extensive verification for humongous regions
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diff
changeset
|
1332 prepare_for_verify(); |
3772
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changeset
|
1333 Universe::verify(/* allow dirty */ false, |
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|
1334 /* silent */ false, |
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|
1335 /* option */ VerifyOption_G1UsePrevMarking); |
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1336 |
342 | 1337 } |
3979
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|
1338 |
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|
1339 assert(!ref_processor_stw()->discovery_enabled(), "Postcondition"); |
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|
1340 ref_processor_stw()->verify_no_references_recorded(); |
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|
1341 |
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1342 // Note: since we've just done a full GC, concurrent |
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1343 // marking is no longer active. Therefore we need not |
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1344 // re-enable reference discovery for the CM ref processor. |
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1345 // That will be done at the start of the next marking cycle. |
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1346 assert(!ref_processor_cm()->discovery_enabled(), "Postcondition"); |
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1347 ref_processor_cm()->verify_no_references_recorded(); |
342 | 1348 |
1349 reset_gc_time_stamp(); | |
1350 // Since everything potentially moved, we will clear all remembered | |
626
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1351 // sets, and clear all cards. Later we will rebuild remebered |
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1352 // sets. We will also reset the GC time stamps of the regions. |
342 | 1353 PostMCRemSetClearClosure rs_clear(mr_bs()); |
1354 heap_region_iterate(&rs_clear); | |
1355 | |
1356 // Resize the heap if necessary. | |
1656
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1357 resize_if_necessary_after_full_collection(explicit_gc ? 0 : word_size); |
342 | 1358 |
3778
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1359 if (_hr_printer.is_active()) { |
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1360 // We should do this after we potentially resize the heap so |
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1361 // that all the COMMIT / UNCOMMIT events are generated before |
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1362 // the end GC event. |
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1363 |
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1364 PostCompactionPrinterClosure cl(hr_printer()); |
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1365 heap_region_iterate(&cl); |
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1366 |
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1367 _hr_printer.end_gc(true /* full */, (size_t) total_collections()); |
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1368 } |
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1369 |
342 | 1370 if (_cg1r->use_cache()) { |
1371 _cg1r->clear_and_record_card_counts(); | |
1372 _cg1r->clear_hot_cache(); | |
1373 } | |
1374 | |
626
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1375 // Rebuild remembered sets of all regions. |
1833
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1376 if (G1CollectedHeap::use_parallel_gc_threads()) { |
4095
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1377 int n_workers = |
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1378 AdaptiveSizePolicy::calc_active_workers(workers()->total_workers(), |
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1379 workers()->active_workers(), |
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1380 Threads::number_of_non_daemon_threads()); |
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1381 assert(UseDynamicNumberOfGCThreads || |
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1382 n_workers == workers()->total_workers(), |
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1383 "If not dynamic should be using all the workers"); |
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1384 workers()->set_active_workers(n_workers); |
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1385 // Set parallel threads in the heap (_n_par_threads) only |
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1386 // before a parallel phase and always reset it to 0 after |
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1387 // the phase so that the number of parallel threads does |
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1388 // no get carried forward to a serial phase where there |
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1389 // may be code that is "possibly_parallel". |
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1390 set_par_threads(n_workers); |
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1391 |
626
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1392 ParRebuildRSTask rebuild_rs_task(this); |
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1393 assert(check_heap_region_claim_values( |
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1394 HeapRegion::InitialClaimValue), "sanity check"); |
4095
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|
1395 assert(UseDynamicNumberOfGCThreads || |
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1396 workers()->active_workers() == workers()->total_workers(), |
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1397 "Unless dynamic should use total workers"); |
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1398 // Use the most recent number of active workers |
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1399 assert(workers()->active_workers() > 0, |
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1400 "Active workers not properly set"); |
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1401 set_par_threads(workers()->active_workers()); |
626
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1402 workers()->run_task(&rebuild_rs_task); |
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1403 set_par_threads(0); |
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1404 assert(check_heap_region_claim_values( |
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1405 HeapRegion::RebuildRSClaimValue), "sanity check"); |
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1406 reset_heap_region_claim_values(); |
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1407 } else { |
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1408 RebuildRSOutOfRegionClosure rebuild_rs(this); |
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1409 heap_region_iterate(&rebuild_rs); |
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1410 } |
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1411 |
342 | 1412 if (PrintGC) { |
1413 print_size_transition(gclog_or_tty, g1h_prev_used, used(), capacity()); | |
1414 } | |
1415 | |
1416 if (true) { // FIXME | |
1417 // Ask the permanent generation to adjust size for full collections | |
1418 perm()->compute_new_size(); | |
1419 } | |
1420 | |
1394
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1421 // Start a new incremental collection set for the next pause |
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1422 assert(g1_policy()->collection_set() == NULL, "must be"); |
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1423 g1_policy()->start_incremental_cset_building(); |
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1424 |
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1425 // Clear the _cset_fast_test bitmap in anticipation of adding |
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1426 // regions to the incremental collection set for the next |
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1427 // evacuation pause. |
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|
1428 clear_cset_fast_test(); |
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|
1429 |
2433
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|
1430 init_mutator_alloc_region(); |
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|
1431 |
342 | 1432 double end = os::elapsedTime(); |
1433 g1_policy()->record_full_collection_end(); | |
1434 | |
546
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1435 #ifdef TRACESPINNING |
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6690928: Use spinning in combination with yields for workstealing termination.
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1436 ParallelTaskTerminator::print_termination_counts(); |
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|
1437 #endif |
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1438 |
342 | 1439 gc_epilogue(true); |
1440 | |
794 | 1441 // Discard all rset updates |
1442 JavaThread::dirty_card_queue_set().abandon_logs(); | |
616
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|
1443 assert(!G1DeferredRSUpdate |
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1444 || (G1DeferredRSUpdate && (dirty_card_queue_set().completed_buffers_num() == 0)), "Should not be any"); |
342 | 1445 } |
1446 | |
3867
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1447 _young_list->reset_sampled_info(); |
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1448 // At this point there should be no regions in the |
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1449 // entire heap tagged as young. |
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1450 assert( check_young_list_empty(true /* check_heap */), |
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1451 "young list should be empty at this point"); |
838
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1452 |
1656
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1453 // Update the number of full collections that have been completed. |
2030
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1454 increment_full_collections_completed(false /* concurrent */); |
1656
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|
1455 |
3766 | 1456 _hrs.verify_optional(); |
2152 | 1457 verify_region_sets_optional(); |
1458 | |
838
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1459 if (PrintHeapAtGC) { |
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1460 Universe::print_heap_after_gc(); |
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|
1461 } |
3980
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|
1462 g1mm()->update_sizes(); |
3869
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1463 post_full_gc_dump(); |
1973 | 1464 |
1465 return true; | |
342 | 1466 } |
1467 | |
1468 void G1CollectedHeap::do_full_collection(bool clear_all_soft_refs) { | |
1973 | 1469 // do_collection() will return whether it succeeded in performing |
1470 // the GC. Currently, there is no facility on the | |
1471 // do_full_collection() API to notify the caller than the collection | |
1472 // did not succeed (e.g., because it was locked out by the GC | |
1473 // locker). So, right now, we'll ignore the return value. | |
1474 bool dummy = do_collection(true, /* explicit_gc */ | |
1475 clear_all_soft_refs, | |
1476 0 /* word_size */); | |
342 | 1477 } |
1478 | |
1479 // This code is mostly copied from TenuredGeneration. | |
1480 void | |
1481 G1CollectedHeap:: | |
1482 resize_if_necessary_after_full_collection(size_t word_size) { | |
1483 assert(MinHeapFreeRatio <= MaxHeapFreeRatio, "sanity check"); | |
1484 | |
1485 // Include the current allocation, if any, and bytes that will be | |
1486 // pre-allocated to support collections, as "used". | |
1487 const size_t used_after_gc = used(); | |
1488 const size_t capacity_after_gc = capacity(); | |
1489 const size_t free_after_gc = capacity_after_gc - used_after_gc; | |
1490 | |
1717
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1491 // This is enforced in arguments.cpp. |
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1492 assert(MinHeapFreeRatio <= MaxHeapFreeRatio, |
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1493 "otherwise the code below doesn't make sense"); |
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1494 |
342 | 1495 // We don't have floating point command-line arguments |
1717
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1496 const double minimum_free_percentage = (double) MinHeapFreeRatio / 100.0; |
342 | 1497 const double maximum_used_percentage = 1.0 - minimum_free_percentage; |
1717
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1498 const double maximum_free_percentage = (double) MaxHeapFreeRatio / 100.0; |
342 | 1499 const double minimum_used_percentage = 1.0 - maximum_free_percentage; |
1500 | |
1717
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1501 const size_t min_heap_size = collector_policy()->min_heap_byte_size(); |
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1502 const size_t max_heap_size = collector_policy()->max_heap_byte_size(); |
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1503 |
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1504 // We have to be careful here as these two calculations can overflow |
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1505 // 32-bit size_t's. |
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1506 double used_after_gc_d = (double) used_after_gc; |
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1507 double minimum_desired_capacity_d = used_after_gc_d / maximum_used_percentage; |
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1508 double maximum_desired_capacity_d = used_after_gc_d / minimum_used_percentage; |
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1509 |
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1510 // Let's make sure that they are both under the max heap size, which |
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1511 // by default will make them fit into a size_t. |
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1512 double desired_capacity_upper_bound = (double) max_heap_size; |
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1513 minimum_desired_capacity_d = MIN2(minimum_desired_capacity_d, |
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1514 desired_capacity_upper_bound); |
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1515 maximum_desired_capacity_d = MIN2(maximum_desired_capacity_d, |
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1516 desired_capacity_upper_bound); |
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1517 |
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1518 // We can now safely turn them into size_t's. |
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1519 size_t minimum_desired_capacity = (size_t) minimum_desired_capacity_d; |
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1520 size_t maximum_desired_capacity = (size_t) maximum_desired_capacity_d; |
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1521 |
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1522 // This assert only makes sense here, before we adjust them |
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1523 // with respect to the min and max heap size. |
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1524 assert(minimum_desired_capacity <= maximum_desired_capacity, |
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1525 err_msg("minimum_desired_capacity = "SIZE_FORMAT", " |
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1526 "maximum_desired_capacity = "SIZE_FORMAT, |
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1527 minimum_desired_capacity, maximum_desired_capacity)); |
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1528 |
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1529 // Should not be greater than the heap max size. No need to adjust |
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1530 // it with respect to the heap min size as it's a lower bound (i.e., |
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1531 // we'll try to make the capacity larger than it, not smaller). |
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1532 minimum_desired_capacity = MIN2(minimum_desired_capacity, max_heap_size); |
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1533 // Should not be less than the heap min size. No need to adjust it |
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1534 // with respect to the heap max size as it's an upper bound (i.e., |
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1535 // we'll try to make the capacity smaller than it, not greater). |
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1536 maximum_desired_capacity = MAX2(maximum_desired_capacity, min_heap_size); |
342 | 1537 |
1717
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1538 if (capacity_after_gc < minimum_desired_capacity) { |
342 | 1539 // Don't expand unless it's significant |
1540 size_t expand_bytes = minimum_desired_capacity - capacity_after_gc; | |
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1541 ergo_verbose4(ErgoHeapSizing, |
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1542 "attempt heap expansion", |
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1543 ergo_format_reason("capacity lower than " |
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1544 "min desired capacity after Full GC") |
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1545 ergo_format_byte("capacity") |
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1546 ergo_format_byte("occupancy") |
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1547 ergo_format_byte_perc("min desired capacity"), |
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1548 capacity_after_gc, used_after_gc, |
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1549 minimum_desired_capacity, (double) MinHeapFreeRatio); |
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1550 expand(expand_bytes); |
342 | 1551 |
1552 // No expansion, now see if we want to shrink | |
1717
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1553 } else if (capacity_after_gc > maximum_desired_capacity) { |
342 | 1554 // Capacity too large, compute shrinking size |
1555 size_t shrink_bytes = capacity_after_gc - maximum_desired_capacity; | |
3914
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1556 ergo_verbose4(ErgoHeapSizing, |
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1557 "attempt heap shrinking", |
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1558 ergo_format_reason("capacity higher than " |
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1559 "max desired capacity after Full GC") |
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1560 ergo_format_byte("capacity") |
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1561 ergo_format_byte("occupancy") |
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1562 ergo_format_byte_perc("max desired capacity"), |
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1563 capacity_after_gc, used_after_gc, |
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1564 maximum_desired_capacity, (double) MaxHeapFreeRatio); |
342 | 1565 shrink(shrink_bytes); |
1566 } | |
1567 } | |
1568 | |
1569 | |
1570 HeapWord* | |
1973 | 1571 G1CollectedHeap::satisfy_failed_allocation(size_t word_size, |
1572 bool* succeeded) { | |
2152 | 1573 assert_at_safepoint(true /* should_be_vm_thread */); |
1973 | 1574 |
1575 *succeeded = true; | |
1576 // Let's attempt the allocation first. | |
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1577 HeapWord* result = |
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1578 attempt_allocation_at_safepoint(word_size, |
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1579 false /* expect_null_mutator_alloc_region */); |
1973 | 1580 if (result != NULL) { |
1581 assert(*succeeded, "sanity"); | |
1582 return result; | |
1583 } | |
342 | 1584 |
1585 // In a G1 heap, we're supposed to keep allocation from failing by | |
1586 // incremental pauses. Therefore, at least for now, we'll favor | |
1587 // expansion over collection. (This might change in the future if we can | |
1588 // do something smarter than full collection to satisfy a failed alloc.) | |
1589 result = expand_and_allocate(word_size); | |
1590 if (result != NULL) { | |
1973 | 1591 assert(*succeeded, "sanity"); |
342 | 1592 return result; |
1593 } | |
1594 | |
1973 | 1595 // Expansion didn't work, we'll try to do a Full GC. |
1596 bool gc_succeeded = do_collection(false, /* explicit_gc */ | |
1597 false, /* clear_all_soft_refs */ | |
1598 word_size); | |
1599 if (!gc_succeeded) { | |
1600 *succeeded = false; | |
1601 return NULL; | |
1602 } | |
1603 | |
1604 // Retry the allocation | |
1605 result = attempt_allocation_at_safepoint(word_size, | |
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1606 true /* expect_null_mutator_alloc_region */); |
342 | 1607 if (result != NULL) { |
1973 | 1608 assert(*succeeded, "sanity"); |
342 | 1609 return result; |
1610 } | |
1611 | |
1973 | 1612 // Then, try a Full GC that will collect all soft references. |
1613 gc_succeeded = do_collection(false, /* explicit_gc */ | |
1614 true, /* clear_all_soft_refs */ | |
1615 word_size); | |
1616 if (!gc_succeeded) { | |
1617 *succeeded = false; | |
1618 return NULL; | |
1619 } | |
1620 | |
1621 // Retry the allocation once more | |
1622 result = attempt_allocation_at_safepoint(word_size, | |
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1623 true /* expect_null_mutator_alloc_region */); |
342 | 1624 if (result != NULL) { |
1973 | 1625 assert(*succeeded, "sanity"); |
342 | 1626 return result; |
1627 } | |
1628 | |
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1629 assert(!collector_policy()->should_clear_all_soft_refs(), |
1973 | 1630 "Flag should have been handled and cleared prior to this point"); |
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1631 |
342 | 1632 // What else? We might try synchronous finalization later. If the total |
1633 // space available is large enough for the allocation, then a more | |
1634 // complete compaction phase than we've tried so far might be | |
1635 // appropriate. | |
1973 | 1636 assert(*succeeded, "sanity"); |
342 | 1637 return NULL; |
1638 } | |
1639 | |
1640 // Attempting to expand the heap sufficiently | |
1641 // to support an allocation of the given "word_size". If | |
1642 // successful, perform the allocation and return the address of the | |
1643 // allocated block, or else "NULL". | |
1644 | |
1645 HeapWord* G1CollectedHeap::expand_and_allocate(size_t word_size) { | |
2152 | 1646 assert_at_safepoint(true /* should_be_vm_thread */); |
1647 | |
1648 verify_region_sets_optional(); | |
1973 | 1649 |
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1650 size_t expand_bytes = MAX2(word_size * HeapWordSize, MinHeapDeltaBytes); |
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1651 ergo_verbose1(ErgoHeapSizing, |
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1652 "attempt heap expansion", |
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1653 ergo_format_reason("allocation request failed") |
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1654 ergo_format_byte("allocation request"), |
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1655 word_size * HeapWordSize); |
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1656 if (expand(expand_bytes)) { |
3766 | 1657 _hrs.verify_optional(); |
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1658 verify_region_sets_optional(); |
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1659 return attempt_allocation_at_safepoint(word_size, |
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1660 false /* expect_null_mutator_alloc_region */); |
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1661 } |
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1662 return NULL; |
342 | 1663 } |
1664 | |
3766 | 1665 void G1CollectedHeap::update_committed_space(HeapWord* old_end, |
1666 HeapWord* new_end) { | |
1667 assert(old_end != new_end, "don't call this otherwise"); | |
1668 assert((HeapWord*) _g1_storage.high() == new_end, "invariant"); | |
1669 | |
1670 // Update the committed mem region. | |
1671 _g1_committed.set_end(new_end); | |
1672 // Tell the card table about the update. | |
1673 Universe::heap()->barrier_set()->resize_covered_region(_g1_committed); | |
1674 // Tell the BOT about the update. | |
1675 _bot_shared->resize(_g1_committed.word_size()); | |
1676 } | |
1677 | |
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1678 bool G1CollectedHeap::expand(size_t expand_bytes) { |
342 | 1679 size_t old_mem_size = _g1_storage.committed_size(); |
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1680 size_t aligned_expand_bytes = ReservedSpace::page_align_size_up(expand_bytes); |
342 | 1681 aligned_expand_bytes = align_size_up(aligned_expand_bytes, |
1682 HeapRegion::GrainBytes); | |
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1683 ergo_verbose2(ErgoHeapSizing, |
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1684 "expand the heap", |
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1685 ergo_format_byte("requested expansion amount") |
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1686 ergo_format_byte("attempted expansion amount"), |
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1687 expand_bytes, aligned_expand_bytes); |
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1688 |
3766 | 1689 // First commit the memory. |
1690 HeapWord* old_end = (HeapWord*) _g1_storage.high(); | |
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1691 bool successful = _g1_storage.expand_by(aligned_expand_bytes); |
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1692 if (successful) { |
3766 | 1693 // Then propagate this update to the necessary data structures. |
1694 HeapWord* new_end = (HeapWord*) _g1_storage.high(); | |
1695 update_committed_space(old_end, new_end); | |
1696 | |
1697 FreeRegionList expansion_list("Local Expansion List"); | |
1698 MemRegion mr = _hrs.expand_by(old_end, new_end, &expansion_list); | |
1699 assert(mr.start() == old_end, "post-condition"); | |
1700 // mr might be a smaller region than what was requested if | |
1701 // expand_by() was unable to allocate the HeapRegion instances | |
1702 assert(mr.end() <= new_end, "post-condition"); | |
1703 | |
1704 size_t actual_expand_bytes = mr.byte_size(); | |
1705 assert(actual_expand_bytes <= aligned_expand_bytes, "post-condition"); | |
1706 assert(actual_expand_bytes == expansion_list.total_capacity_bytes(), | |
1707 "post-condition"); | |
1708 if (actual_expand_bytes < aligned_expand_bytes) { | |
1709 // We could not expand _hrs to the desired size. In this case we | |
1710 // need to shrink the committed space accordingly. | |
1711 assert(mr.end() < new_end, "invariant"); | |
1712 | |
1713 size_t diff_bytes = aligned_expand_bytes - actual_expand_bytes; | |
1714 // First uncommit the memory. | |
1715 _g1_storage.shrink_by(diff_bytes); | |
1716 // Then propagate this update to the necessary data structures. | |
1717 update_committed_space(new_end, mr.end()); | |
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1718 } |
3766 | 1719 _free_list.add_as_tail(&expansion_list); |
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1720 |
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1721 if (_hr_printer.is_active()) { |
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1722 HeapWord* curr = mr.start(); |
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1723 while (curr < mr.end()) { |
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1724 HeapWord* curr_end = curr + HeapRegion::GrainWords; |
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1725 _hr_printer.commit(curr, curr_end); |
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1726 curr = curr_end; |
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1727 } |
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1728 assert(curr == mr.end(), "post-condition"); |
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1729 } |
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1730 g1_policy()->record_new_heap_size(n_regions()); |
2188
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1731 } else { |
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1732 ergo_verbose0(ErgoHeapSizing, |
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1733 "did not expand the heap", |
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1734 ergo_format_reason("heap expansion operation failed")); |
2188
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1735 // The expansion of the virtual storage space was unsuccessful. |
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1736 // Let's see if it was because we ran out of swap. |
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1737 if (G1ExitOnExpansionFailure && |
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1738 _g1_storage.uncommitted_size() >= aligned_expand_bytes) { |
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1739 // We had head room... |
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1740 vm_exit_out_of_memory(aligned_expand_bytes, "G1 heap expansion"); |
342 | 1741 } |
1742 } | |
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1743 return successful; |
342 | 1744 } |
1745 | |
3766 | 1746 void G1CollectedHeap::shrink_helper(size_t shrink_bytes) { |
342 | 1747 size_t old_mem_size = _g1_storage.committed_size(); |
1748 size_t aligned_shrink_bytes = | |
1749 ReservedSpace::page_align_size_down(shrink_bytes); | |
1750 aligned_shrink_bytes = align_size_down(aligned_shrink_bytes, | |
1751 HeapRegion::GrainBytes); | |
1752 size_t num_regions_deleted = 0; | |
3766 | 1753 MemRegion mr = _hrs.shrink_by(aligned_shrink_bytes, &num_regions_deleted); |
1754 HeapWord* old_end = (HeapWord*) _g1_storage.high(); | |
1755 assert(mr.end() == old_end, "post-condition"); | |
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1756 |
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1757 ergo_verbose3(ErgoHeapSizing, |
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1758 "shrink the heap", |
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1759 ergo_format_byte("requested shrinking amount") |
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1760 ergo_format_byte("aligned shrinking amount") |
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1761 ergo_format_byte("attempted shrinking amount"), |
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1762 shrink_bytes, aligned_shrink_bytes, mr.byte_size()); |
3766 | 1763 if (mr.byte_size() > 0) { |
3778
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1764 if (_hr_printer.is_active()) { |
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1765 HeapWord* curr = mr.end(); |
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1766 while (curr > mr.start()) { |
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1767 HeapWord* curr_end = curr; |
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1768 curr -= HeapRegion::GrainWords; |
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1769 _hr_printer.uncommit(curr, curr_end); |
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1770 } |
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1771 assert(curr == mr.start(), "post-condition"); |
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1772 } |
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1773 |
342 | 1774 _g1_storage.shrink_by(mr.byte_size()); |
3766 | 1775 HeapWord* new_end = (HeapWord*) _g1_storage.high(); |
1776 assert(mr.start() == new_end, "post-condition"); | |
1777 | |
1778 _expansion_regions += num_regions_deleted; | |
1779 update_committed_space(old_end, new_end); | |
1780 HeapRegionRemSet::shrink_heap(n_regions()); | |
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1781 g1_policy()->record_new_heap_size(n_regions()); |
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1782 } else { |
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1783 ergo_verbose0(ErgoHeapSizing, |
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1784 "did not shrink the heap", |
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1785 ergo_format_reason("heap shrinking operation failed")); |
342 | 1786 } |
1787 } | |
1788 | |
1789 void G1CollectedHeap::shrink(size_t shrink_bytes) { | |
2152 | 1790 verify_region_sets_optional(); |
1791 | |
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1792 // We should only reach here at the end of a Full GC which means we |
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1793 // should not not be holding to any GC alloc regions. The method |
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1794 // below will make sure of that and do any remaining clean up. |
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1795 abandon_gc_alloc_regions(); |
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1796 |
2152 | 1797 // Instead of tearing down / rebuilding the free lists here, we |
1798 // could instead use the remove_all_pending() method on free_list to | |
1799 // remove only the ones that we need to remove. | |
4072 | 1800 tear_down_region_sets(true /* free_list_only */); |
342 | 1801 shrink_helper(shrink_bytes); |
4072 | 1802 rebuild_region_sets(true /* free_list_only */); |
2152 | 1803 |
3766 | 1804 _hrs.verify_optional(); |
2152 | 1805 verify_region_sets_optional(); |
342 | 1806 } |
1807 | |
1808 // Public methods. | |
1809 | |
1810 #ifdef _MSC_VER // the use of 'this' below gets a warning, make it go away | |
1811 #pragma warning( disable:4355 ) // 'this' : used in base member initializer list | |
1812 #endif // _MSC_VER | |
1813 | |
1814 | |
1815 G1CollectedHeap::G1CollectedHeap(G1CollectorPolicy* policy_) : | |
1816 SharedHeap(policy_), | |
1817 _g1_policy(policy_), | |
1111 | 1818 _dirty_card_queue_set(false), |
1705 | 1819 _into_cset_dirty_card_queue_set(false), |
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1820 _is_alive_closure_cm(this), |
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1821 _is_alive_closure_stw(this), |
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1822 _ref_processor_cm(NULL), |
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1823 _ref_processor_stw(NULL), |
342 | 1824 _process_strong_tasks(new SubTasksDone(G1H_PS_NumElements)), |
1825 _bot_shared(NULL), | |
1826 _objs_with_preserved_marks(NULL), _preserved_marks_of_objs(NULL), | |
1827 _evac_failure_scan_stack(NULL) , | |
1828 _mark_in_progress(false), | |
2152 | 1829 _cg1r(NULL), _summary_bytes_used(0), |
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1830 _g1mm(NULL), |
342 | 1831 _refine_cte_cl(NULL), |
1832 _full_collection(false), | |
2152 | 1833 _free_list("Master Free List"), |
1834 _secondary_free_list("Secondary Free List"), | |
4072 | 1835 _old_set("Old Set"), |
2152 | 1836 _humongous_set("Master Humongous Set"), |
1837 _free_regions_coming(false), | |
342 | 1838 _young_list(new YoungList(this)), |
1839 _gc_time_stamp(0), | |
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1840 _retained_old_gc_alloc_region(NULL), |
526 | 1841 _surviving_young_words(NULL), |
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1842 _full_collections_completed(0), |
526 | 1843 _in_cset_fast_test(NULL), |
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1844 _in_cset_fast_test_base(NULL), |
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1845 _dirty_cards_region_list(NULL) { |
342 | 1846 _g1h = this; // To catch bugs. |
1847 if (_process_strong_tasks == NULL || !_process_strong_tasks->valid()) { | |
1848 vm_exit_during_initialization("Failed necessary allocation."); | |
1849 } | |
942
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1850 |
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1851 _humongous_object_threshold_in_words = HeapRegion::GrainWords / 2; |
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1852 |
342 | 1853 int n_queues = MAX2((int)ParallelGCThreads, 1); |
1854 _task_queues = new RefToScanQueueSet(n_queues); | |
1855 | |
1856 int n_rem_sets = HeapRegionRemSet::num_par_rem_sets(); | |
1857 assert(n_rem_sets > 0, "Invariant."); | |
1858 | |
1859 HeapRegionRemSetIterator** iter_arr = | |
1860 NEW_C_HEAP_ARRAY(HeapRegionRemSetIterator*, n_queues); | |
1861 for (int i = 0; i < n_queues; i++) { | |
1862 iter_arr[i] = new HeapRegionRemSetIterator(); | |
1863 } | |
1864 _rem_set_iterator = iter_arr; | |
1865 | |
1866 for (int i = 0; i < n_queues; i++) { | |
1867 RefToScanQueue* q = new RefToScanQueue(); | |
1868 q->initialize(); | |
1869 _task_queues->register_queue(i, q); | |
1870 } | |
1871 | |
1872 guarantee(_task_queues != NULL, "task_queues allocation failure."); | |
1873 } | |
1874 | |
1875 jint G1CollectedHeap::initialize() { | |
1166 | 1876 CollectedHeap::pre_initialize(); |
342 | 1877 os::enable_vtime(); |
1878 | |
1879 // Necessary to satisfy locking discipline assertions. | |
1880 | |
1881 MutexLocker x(Heap_lock); | |
1882 | |
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1883 // We have to initialize the printer before committing the heap, as |
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1884 // it will be used then. |
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1885 _hr_printer.set_active(G1PrintHeapRegions); |
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1886 |
342 | 1887 // While there are no constraints in the GC code that HeapWordSize |
1888 // be any particular value, there are multiple other areas in the | |
1889 // system which believe this to be true (e.g. oop->object_size in some | |
1890 // cases incorrectly returns the size in wordSize units rather than | |
1891 // HeapWordSize). | |
1892 guarantee(HeapWordSize == wordSize, "HeapWordSize must equal wordSize"); | |
1893 | |
1894 size_t init_byte_size = collector_policy()->initial_heap_byte_size(); | |
1895 size_t max_byte_size = collector_policy()->max_heap_byte_size(); | |
1896 | |
1897 // Ensure that the sizes are properly aligned. | |
1898 Universe::check_alignment(init_byte_size, HeapRegion::GrainBytes, "g1 heap"); | |
1899 Universe::check_alignment(max_byte_size, HeapRegion::GrainBytes, "g1 heap"); | |
1900 | |
1901 _cg1r = new ConcurrentG1Refine(); | |
1902 | |
1903 // Reserve the maximum. | |
1904 PermanentGenerationSpec* pgs = collector_policy()->permanent_generation(); | |
1905 // Includes the perm-gen. | |
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1906 |
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1907 // When compressed oops are enabled, the preferred heap base |
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1908 // is calculated by subtracting the requested size from the |
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1909 // 32Gb boundary and using the result as the base address for |
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1910 // heap reservation. If the requested size is not aligned to |
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1911 // HeapRegion::GrainBytes (i.e. the alignment that is passed |
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1912 // into the ReservedHeapSpace constructor) then the actual |
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1913 // base of the reserved heap may end up differing from the |
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1914 // address that was requested (i.e. the preferred heap base). |
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1915 // If this happens then we could end up using a non-optimal |
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1916 // compressed oops mode. |
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1917 |
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1918 // Since max_byte_size is aligned to the size of a heap region (checked |
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1919 // above), we also need to align the perm gen size as it might not be. |
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1920 const size_t total_reserved = max_byte_size + |
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1921 align_size_up(pgs->max_size(), HeapRegion::GrainBytes); |
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1922 Universe::check_alignment(total_reserved, HeapRegion::GrainBytes, "g1 heap and perm"); |
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1923 |
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1924 char* addr = Universe::preferred_heap_base(total_reserved, Universe::UnscaledNarrowOop); |
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1925 |
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1926 ReservedHeapSpace heap_rs(total_reserved, HeapRegion::GrainBytes, |
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1927 UseLargePages, addr); |
642
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1928 |
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1929 if (UseCompressedOops) { |
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1930 if (addr != NULL && !heap_rs.is_reserved()) { |
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1931 // Failed to reserve at specified address - the requested memory |
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1932 // region is taken already, for example, by 'java' launcher. |
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1933 // Try again to reserver heap higher. |
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1934 addr = Universe::preferred_heap_base(total_reserved, Universe::ZeroBasedNarrowOop); |
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1935 |
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1936 ReservedHeapSpace heap_rs0(total_reserved, HeapRegion::GrainBytes, |
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1937 UseLargePages, addr); |
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1938 |
642
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1939 if (addr != NULL && !heap_rs0.is_reserved()) { |
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1940 // Failed to reserve at specified address again - give up. |
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1941 addr = Universe::preferred_heap_base(total_reserved, Universe::HeapBasedNarrowOop); |
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1942 assert(addr == NULL, ""); |
3824
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1943 |
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1944 ReservedHeapSpace heap_rs1(total_reserved, HeapRegion::GrainBytes, |
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1945 UseLargePages, addr); |
642
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1946 heap_rs = heap_rs1; |
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1947 } else { |
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1948 heap_rs = heap_rs0; |
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1949 } |
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1950 } |
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1951 } |
342 | 1952 |
1953 if (!heap_rs.is_reserved()) { | |
1954 vm_exit_during_initialization("Could not reserve enough space for object heap"); | |
1955 return JNI_ENOMEM; | |
1956 } | |
1957 | |
1958 // It is important to do this in a way such that concurrent readers can't | |
1959 // temporarily think somethings in the heap. (I've actually seen this | |
1960 // happen in asserts: DLD.) | |
1961 _reserved.set_word_size(0); | |
1962 _reserved.set_start((HeapWord*)heap_rs.base()); | |
1963 _reserved.set_end((HeapWord*)(heap_rs.base() + heap_rs.size())); | |
1964 | |
1965 _expansion_regions = max_byte_size/HeapRegion::GrainBytes; | |
1966 | |
1967 // Create the gen rem set (and barrier set) for the entire reserved region. | |
1968 _rem_set = collector_policy()->create_rem_set(_reserved, 2); | |
1969 set_barrier_set(rem_set()->bs()); | |
1970 if (barrier_set()->is_a(BarrierSet::ModRef)) { | |
1971 _mr_bs = (ModRefBarrierSet*)_barrier_set; | |
1972 } else { | |
1973 vm_exit_during_initialization("G1 requires a mod ref bs."); | |
1974 return JNI_ENOMEM; | |
1975 } | |
1976 | |
1977 // Also create a G1 rem set. | |
1861 | 1978 if (mr_bs()->is_a(BarrierSet::CardTableModRef)) { |
1979 _g1_rem_set = new G1RemSet(this, (CardTableModRefBS*)mr_bs()); | |
342 | 1980 } else { |
1861 | 1981 vm_exit_during_initialization("G1 requires a cardtable mod ref bs."); |
1982 return JNI_ENOMEM; | |
342 | 1983 } |
1984 | |
1985 // Carve out the G1 part of the heap. | |
1986 | |
1987 ReservedSpace g1_rs = heap_rs.first_part(max_byte_size); | |
1988 _g1_reserved = MemRegion((HeapWord*)g1_rs.base(), | |
1989 g1_rs.size()/HeapWordSize); | |
1990 ReservedSpace perm_gen_rs = heap_rs.last_part(max_byte_size); | |
1991 | |
1992 _perm_gen = pgs->init(perm_gen_rs, pgs->init_size(), rem_set()); | |
1993 | |
1994 _g1_storage.initialize(g1_rs, 0); | |
1995 _g1_committed = MemRegion((HeapWord*)_g1_storage.low(), (size_t) 0); | |
3766 | 1996 _hrs.initialize((HeapWord*) _g1_reserved.start(), |
1997 (HeapWord*) _g1_reserved.end(), | |
1998 _expansion_regions); | |
342 | 1999 |
807
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2000 // 6843694 - ensure that the maximum region index can fit |
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2001 // in the remembered set structures. |
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2002 const size_t max_region_idx = ((size_t)1 << (sizeof(RegionIdx_t)*BitsPerByte-1)) - 1; |
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2003 guarantee((max_regions() - 1) <= max_region_idx, "too many regions"); |
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2004 |
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2005 size_t max_cards_per_region = ((size_t)1 << (sizeof(CardIdx_t)*BitsPerByte-1)) - 1; |
942
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2006 guarantee(HeapRegion::CardsPerRegion > 0, "make sure it's initialized"); |
3986
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2007 guarantee(HeapRegion::CardsPerRegion < max_cards_per_region, |
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2008 "too many cards per region"); |
807
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2009 |
2152 | 2010 HeapRegionSet::set_unrealistically_long_length(max_regions() + 1); |
2011 | |
342 | 2012 _bot_shared = new G1BlockOffsetSharedArray(_reserved, |
2013 heap_word_size(init_byte_size)); | |
2014 | |
2015 _g1h = this; | |
2016 | |
1394
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2017 _in_cset_fast_test_length = max_regions(); |
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2018 _in_cset_fast_test_base = NEW_C_HEAP_ARRAY(bool, _in_cset_fast_test_length); |
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|
2019 |
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2020 // We're biasing _in_cset_fast_test to avoid subtracting the |
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2021 // beginning of the heap every time we want to index; basically |
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2022 // it's the same with what we do with the card table. |
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2023 _in_cset_fast_test = _in_cset_fast_test_base - |
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2024 ((size_t) _g1_reserved.start() >> HeapRegion::LogOfHRGrainBytes); |
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|
2025 |
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2026 // Clear the _cset_fast_test bitmap in anticipation of adding |
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2027 // regions to the incremental collection set for the first |
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2028 // evacuation pause. |
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2029 clear_cset_fast_test(); |
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2030 |
342 | 2031 // Create the ConcurrentMark data structure and thread. |
2032 // (Must do this late, so that "max_regions" is defined.) | |
2033 _cm = new ConcurrentMark(heap_rs, (int) max_regions()); | |
2034 _cmThread = _cm->cmThread(); | |
2035 | |
2036 // Initialize the from_card cache structure of HeapRegionRemSet. | |
2037 HeapRegionRemSet::init_heap(max_regions()); | |
2038 | |
677 | 2039 // Now expand into the initial heap size. |
2188
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2040 if (!expand(init_byte_size)) { |
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2041 vm_exit_during_initialization("Failed to allocate initial heap."); |
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2042 return JNI_ENOMEM; |
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|
2043 } |
342 | 2044 |
2045 // Perform any initialization actions delegated to the policy. | |
2046 g1_policy()->init(); | |
2047 | |
2048 _refine_cte_cl = | |
2049 new RefineCardTableEntryClosure(ConcurrentG1RefineThread::sts(), | |
2050 g1_rem_set(), | |
2051 concurrent_g1_refine()); | |
2052 JavaThread::dirty_card_queue_set().set_closure(_refine_cte_cl); | |
2053 | |
2054 JavaThread::satb_mark_queue_set().initialize(SATB_Q_CBL_mon, | |
2055 SATB_Q_FL_lock, | |
1111 | 2056 G1SATBProcessCompletedThreshold, |
342 | 2057 Shared_SATB_Q_lock); |
794 | 2058 |
2059 JavaThread::dirty_card_queue_set().initialize(DirtyCardQ_CBL_mon, | |
2060 DirtyCardQ_FL_lock, | |
1111 | 2061 concurrent_g1_refine()->yellow_zone(), |
2062 concurrent_g1_refine()->red_zone(), | |
794 | 2063 Shared_DirtyCardQ_lock); |
2064 | |
616
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|
2065 if (G1DeferredRSUpdate) { |
4f360ec815ba
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|
2066 dirty_card_queue_set().initialize(DirtyCardQ_CBL_mon, |
4f360ec815ba
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|
2067 DirtyCardQ_FL_lock, |
1111 | 2068 -1, // never trigger processing |
2069 -1, // no limit on length | |
616
4f360ec815ba
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|
2070 Shared_DirtyCardQ_lock, |
4f360ec815ba
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|
2071 &JavaThread::dirty_card_queue_set()); |
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|
2072 } |
1705 | 2073 |
2074 // Initialize the card queue set used to hold cards containing | |
2075 // references into the collection set. | |
2076 _into_cset_dirty_card_queue_set.initialize(DirtyCardQ_CBL_mon, | |
2077 DirtyCardQ_FL_lock, | |
2078 -1, // never trigger processing | |
2079 -1, // no limit on length | |
2080 Shared_DirtyCardQ_lock, | |
2081 &JavaThread::dirty_card_queue_set()); | |
2082 | |
342 | 2083 // In case we're keeping closure specialization stats, initialize those |
2084 // counts and that mechanism. | |
2085 SpecializationStats::clear(); | |
2086 | |
2087 // Do later initialization work for concurrent refinement. | |
2088 _cg1r->init(); | |
2089 | |
2433
abdfc822206f
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|
2090 // Here we allocate the dummy full region that is required by the |
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diff
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|
2091 // G1AllocRegion class. If we don't pass an address in the reserved |
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diff
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|
2092 // space here, lots of asserts fire. |
3766 | 2093 |
2094 HeapRegion* dummy_region = new_heap_region(0 /* index of bottom region */, | |
2095 _g1_reserved.start()); | |
2433
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7023069: G1: Introduce symmetric locking in the slow allocation path
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|
2096 // We'll re-use the same region whether the alloc region will |
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|
2097 // require BOT updates or not and, if it doesn't, then a non-young |
abdfc822206f
7023069: G1: Introduce symmetric locking in the slow allocation path
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|
2098 // region will complain that it cannot support allocations without |
abdfc822206f
7023069: G1: Introduce symmetric locking in the slow allocation path
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diff
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|
2099 // BOT updates. So we'll tag the dummy region as young to avoid that. |
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|
2100 dummy_region->set_young(); |
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|
2101 // Make sure it's full. |
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|
2102 dummy_region->set_top(dummy_region->end()); |
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|
2103 G1AllocRegion::setup(this, dummy_region); |
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|
2104 |
abdfc822206f
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|
2105 init_mutator_alloc_region(); |
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|
2106 |
3289
b52782ae3880
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jmasa
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diff
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|
2107 // Do create of the monitoring and management support so that |
b52782ae3880
6946417: G1: Java VisualVM does not support G1 properly.
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|
2108 // values in the heap have been properly initialized. |
3980
8229bd737950
7075646: G1: fix inconsistencies in the monitoring data
tonyp
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diff
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|
2109 _g1mm = new G1MonitoringSupport(this); |
3289
b52782ae3880
6946417: G1: Java VisualVM does not support G1 properly.
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2110 |
342 | 2111 return JNI_OK; |
2112 } | |
2113 | |
2114 void G1CollectedHeap::ref_processing_init() { | |
1974
fd1d227ef1b9
6983204: G1: Nightly test nsk/regression/b4958615 failing with +ExplicitGCInvokesConcurrent
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diff
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|
2115 // Reference processing in G1 currently works as follows: |
fd1d227ef1b9
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diff
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|
2116 // |
3979
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|
2117 // * There are two reference processor instances. One is |
4dfb2df418f2
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|
2118 // used to record and process discovered references |
4dfb2df418f2
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|
2119 // during concurrent marking; the other is used to |
4dfb2df418f2
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|
2120 // record and process references during STW pauses |
4dfb2df418f2
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|
2121 // (both full and incremental). |
4dfb2df418f2
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|
2122 // * Both ref processors need to 'span' the entire heap as |
4dfb2df418f2
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|
2123 // the regions in the collection set may be dotted around. |
4dfb2df418f2
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|
2124 // |
4dfb2df418f2
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|
2125 // * For the concurrent marking ref processor: |
4dfb2df418f2
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|
2126 // * Reference discovery is enabled at initial marking. |
4dfb2df418f2
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|
2127 // * Reference discovery is disabled and the discovered |
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|
2128 // references processed etc during remarking. |
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|
2129 // * Reference discovery is MT (see below). |
4dfb2df418f2
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|
2130 // * Reference discovery requires a barrier (see below). |
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|
2131 // * Reference processing may or may not be MT |
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|
2132 // (depending on the value of ParallelRefProcEnabled |
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|
2133 // and ParallelGCThreads). |
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|
2134 // * A full GC disables reference discovery by the CM |
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|
2135 // ref processor and abandons any entries on it's |
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|
2136 // discovered lists. |
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|
2137 // |
4dfb2df418f2
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|
2138 // * For the STW processor: |
4dfb2df418f2
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|
2139 // * Non MT discovery is enabled at the start of a full GC. |
4dfb2df418f2
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|
2140 // * Processing and enqueueing during a full GC is non-MT. |
4dfb2df418f2
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|
2141 // * During a full GC, references are processed after marking. |
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|
2142 // |
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|
2143 // * Discovery (may or may not be MT) is enabled at the start |
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6484982: G1: process references during evacuation pauses
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|
2144 // of an incremental evacuation pause. |
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|
2145 // * References are processed near the end of a STW evacuation pause. |
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|
2146 // * For both types of GC: |
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|
2147 // * Discovery is atomic - i.e. not concurrent. |
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6484982: G1: process references during evacuation pauses
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|
2148 // * Reference discovery will not need a barrier. |
1974
fd1d227ef1b9
6983204: G1: Nightly test nsk/regression/b4958615 failing with +ExplicitGCInvokesConcurrent
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diff
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|
2149 |
342 | 2150 SharedHeap::ref_processing_init(); |
2151 MemRegion mr = reserved_region(); | |
3979
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|
2152 |
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6484982: G1: process references during evacuation pauses
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|
2153 // Concurrent Mark ref processor |
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|
2154 _ref_processor_cm = |
2369
92da084fefc9
6668573: CMS: reference processing crash if ParallelCMSThreads > ParallelGCThreads
ysr
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2361
diff
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|
2155 new ReferenceProcessor(mr, // span |
3979
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6484982: G1: process references during evacuation pauses
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|
2156 ParallelRefProcEnabled && (ParallelGCThreads > 1), |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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|
2157 // mt processing |
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diff
changeset
|
2158 (int) ParallelGCThreads, |
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6484982: G1: process references during evacuation pauses
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diff
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|
2159 // degree of mt processing |
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changeset
|
2160 (ParallelGCThreads > 1) || (ConcGCThreads > 1), |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
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diff
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|
2161 // mt discovery |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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diff
changeset
|
2162 (int) MAX2(ParallelGCThreads, ConcGCThreads), |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
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diff
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|
2163 // degree of mt discovery |
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6484982: G1: process references during evacuation pauses
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diff
changeset
|
2164 false, |
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6484982: G1: process references during evacuation pauses
johnc
parents:
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diff
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|
2165 // Reference discovery is not atomic |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
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diff
changeset
|
2166 &_is_alive_closure_cm, |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
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diff
changeset
|
2167 // is alive closure |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
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diff
changeset
|
2168 // (for efficiency/performance) |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
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diff
changeset
|
2169 true); |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
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diff
changeset
|
2170 // Setting next fields of discovered |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
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diff
changeset
|
2171 // lists requires a barrier. |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
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diff
changeset
|
2172 |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
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diff
changeset
|
2173 // STW ref processor |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
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diff
changeset
|
2174 _ref_processor_stw = |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
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diff
changeset
|
2175 new ReferenceProcessor(mr, // span |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
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diff
changeset
|
2176 ParallelRefProcEnabled && (ParallelGCThreads > 1), |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
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diff
changeset
|
2177 // mt processing |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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diff
changeset
|
2178 MAX2((int)ParallelGCThreads, 1), |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
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diff
changeset
|
2179 // degree of mt processing |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
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diff
changeset
|
2180 (ParallelGCThreads > 1), |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
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diff
changeset
|
2181 // mt discovery |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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diff
changeset
|
2182 MAX2((int)ParallelGCThreads, 1), |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
2183 // degree of mt discovery |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
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diff
changeset
|
2184 true, |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
2185 // Reference discovery is atomic |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
2186 &_is_alive_closure_stw, |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
2187 // is alive closure |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
2188 // (for efficiency/performance) |
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6484982: G1: process references during evacuation pauses
johnc
parents:
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diff
changeset
|
2189 false); |
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6484982: G1: process references during evacuation pauses
johnc
parents:
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diff
changeset
|
2190 // Setting next fields of discovered |
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|
2191 // lists requires a barrier. |
342 | 2192 } |
2193 | |
2194 size_t G1CollectedHeap::capacity() const { | |
2195 return _g1_committed.byte_size(); | |
2196 } | |
2197 | |
1705 | 2198 void G1CollectedHeap::iterate_dirty_card_closure(CardTableEntryClosure* cl, |
2199 DirtyCardQueue* into_cset_dcq, | |
2200 bool concurrent, | |
342 | 2201 int worker_i) { |
889 | 2202 // Clean cards in the hot card cache |
1705 | 2203 concurrent_g1_refine()->clean_up_cache(worker_i, g1_rem_set(), into_cset_dcq); |
889 | 2204 |
342 | 2205 DirtyCardQueueSet& dcqs = JavaThread::dirty_card_queue_set(); |
2206 int n_completed_buffers = 0; | |
1705 | 2207 while (dcqs.apply_closure_to_completed_buffer(cl, worker_i, 0, true)) { |
342 | 2208 n_completed_buffers++; |
2209 } | |
2210 g1_policy()->record_update_rs_processed_buffers(worker_i, | |
2211 (double) n_completed_buffers); | |
2212 dcqs.clear_n_completed_buffers(); | |
2213 assert(!dcqs.completed_buffers_exist_dirty(), "Completed buffers exist!"); | |
2214 } | |
2215 | |
2216 | |
2217 // Computes the sum of the storage used by the various regions. | |
2218 | |
2219 size_t G1CollectedHeap::used() const { | |
862
36b5611220a7
6863216: Clean up debugging debris inadvertently pushed with 6700789
ysr
parents:
861
diff
changeset
|
2220 assert(Heap_lock->owner() != NULL, |
36b5611220a7
6863216: Clean up debugging debris inadvertently pushed with 6700789
ysr
parents:
861
diff
changeset
|
2221 "Should be owned on this thread's behalf."); |
342 | 2222 size_t result = _summary_bytes_used; |
845
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
ysr
parents:
838
diff
changeset
|
2223 // Read only once in case it is set to NULL concurrently |
2433
abdfc822206f
7023069: G1: Introduce symmetric locking in the slow allocation path
tonyp
parents:
2432
diff
changeset
|
2224 HeapRegion* hr = _mutator_alloc_region.get(); |
845
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
ysr
parents:
838
diff
changeset
|
2225 if (hr != NULL) |
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
ysr
parents:
838
diff
changeset
|
2226 result += hr->used(); |
342 | 2227 return result; |
2228 } | |
2229 | |
846
42d84bbbecf4
6859911: G1: assert(Heap_lock->owner() = NULL, "Should be owned on this thread's behalf")
tonyp
parents:
845
diff
changeset
|
2230 size_t G1CollectedHeap::used_unlocked() const { |
42d84bbbecf4
6859911: G1: assert(Heap_lock->owner() = NULL, "Should be owned on this thread's behalf")
tonyp
parents:
845
diff
changeset
|
2231 size_t result = _summary_bytes_used; |
42d84bbbecf4
6859911: G1: assert(Heap_lock->owner() = NULL, "Should be owned on this thread's behalf")
tonyp
parents:
845
diff
changeset
|
2232 return result; |
42d84bbbecf4
6859911: G1: assert(Heap_lock->owner() = NULL, "Should be owned on this thread's behalf")
tonyp
parents:
845
diff
changeset
|
2233 } |
42d84bbbecf4
6859911: G1: assert(Heap_lock->owner() = NULL, "Should be owned on this thread's behalf")
tonyp
parents:
845
diff
changeset
|
2234 |
342 | 2235 class SumUsedClosure: public HeapRegionClosure { |
2236 size_t _used; | |
2237 public: | |
2238 SumUsedClosure() : _used(0) {} | |
2239 bool doHeapRegion(HeapRegion* r) { | |
2240 if (!r->continuesHumongous()) { | |
2241 _used += r->used(); | |
2242 } | |
2243 return false; | |
2244 } | |
2245 size_t result() { return _used; } | |
2246 }; | |
2247 | |
2248 size_t G1CollectedHeap::recalculate_used() const { | |
2249 SumUsedClosure blk; | |
3766 | 2250 heap_region_iterate(&blk); |
342 | 2251 return blk.result(); |
2252 } | |
2253 | |
2254 size_t G1CollectedHeap::unsafe_max_alloc() { | |
2152 | 2255 if (free_regions() > 0) return HeapRegion::GrainBytes; |
342 | 2256 // otherwise, is there space in the current allocation region? |
2257 | |
2258 // We need to store the current allocation region in a local variable | |
2259 // here. The problem is that this method doesn't take any locks and | |
2260 // there may be other threads which overwrite the current allocation | |
2261 // region field. attempt_allocation(), for example, sets it to NULL | |
2262 // and this can happen *after* the NULL check here but before the call | |
2263 // to free(), resulting in a SIGSEGV. Note that this doesn't appear | |
2264 // to be a problem in the optimized build, since the two loads of the | |
2265 // current allocation region field are optimized away. | |
2433
abdfc822206f
7023069: G1: Introduce symmetric locking in the slow allocation path
tonyp
parents:
2432
diff
changeset
|
2266 HeapRegion* hr = _mutator_alloc_region.get(); |
abdfc822206f
7023069: G1: Introduce symmetric locking in the slow allocation path
tonyp
parents:
2432
diff
changeset
|
2267 if (hr == NULL) { |
342 | 2268 return 0; |
2269 } | |
2433
abdfc822206f
7023069: G1: Introduce symmetric locking in the slow allocation path
tonyp
parents:
2432
diff
changeset
|
2270 return hr->free(); |
342 | 2271 } |
2272 | |
1656
4e5661ba9d98
6944166: G1: explicit GCs are not always handled correctly
tonyp
parents:
1611
diff
changeset
|
2273 bool G1CollectedHeap::should_do_concurrent_full_gc(GCCause::Cause cause) { |
4e5661ba9d98
6944166: G1: explicit GCs are not always handled correctly
tonyp
parents:
1611
diff
changeset
|
2274 return |
4e5661ba9d98
6944166: G1: explicit GCs are not always handled correctly
tonyp
parents:
1611
diff
changeset
|
2275 ((cause == GCCause::_gc_locker && GCLockerInvokesConcurrent) || |
4e5661ba9d98
6944166: G1: explicit GCs are not always handled correctly
tonyp
parents:
1611
diff
changeset
|
2276 (cause == GCCause::_java_lang_system_gc && ExplicitGCInvokesConcurrent)); |
4e5661ba9d98
6944166: G1: explicit GCs are not always handled correctly
tonyp
parents:
1611
diff
changeset
|
2277 } |
4e5661ba9d98
6944166: G1: explicit GCs are not always handled correctly
tonyp
parents:
1611
diff
changeset
|
2278 |
3285
49a67202bc67
7011855: G1: non-product flag to artificially grow the heap
tonyp
parents:
2433
diff
changeset
|
2279 #ifndef PRODUCT |
49a67202bc67
7011855: G1: non-product flag to artificially grow the heap
tonyp
parents:
2433
diff
changeset
|
2280 void G1CollectedHeap::allocate_dummy_regions() { |
49a67202bc67
7011855: G1: non-product flag to artificially grow the heap
tonyp
parents:
2433
diff
changeset
|
2281 // Let's fill up most of the region |
49a67202bc67
7011855: G1: non-product flag to artificially grow the heap
tonyp
parents:
2433
diff
changeset
|
2282 size_t word_size = HeapRegion::GrainWords - 1024; |
49a67202bc67
7011855: G1: non-product flag to artificially grow the heap
tonyp
parents:
2433
diff
changeset
|
2283 // 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
|
2284 guarantee(isHumongous(word_size), "sanity"); |
49a67202bc67
7011855: G1: non-product flag to artificially grow the heap
tonyp
parents:
2433
diff
changeset
|
2285 |
49a67202bc67
7011855: G1: non-product flag to artificially grow the heap
tonyp
parents:
2433
diff
changeset
|
2286 for (uintx i = 0; i < G1DummyRegionsPerGC; ++i) { |
49a67202bc67
7011855: G1: non-product flag to artificially grow the heap
tonyp
parents:
2433
diff
changeset
|
2287 // 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
|
2288 HeapWord* dummy_obj = humongous_obj_allocate(word_size); |
49a67202bc67
7011855: G1: non-product flag to artificially grow the heap
tonyp
parents:
2433
diff
changeset
|
2289 if (dummy_obj != NULL) { |
49a67202bc67
7011855: G1: non-product flag to artificially grow the heap
tonyp
parents:
2433
diff
changeset
|
2290 MemRegion mr(dummy_obj, word_size); |
49a67202bc67
7011855: G1: non-product flag to artificially grow the heap
tonyp
parents:
2433
diff
changeset
|
2291 CollectedHeap::fill_with_object(mr); |
49a67202bc67
7011855: G1: non-product flag to artificially grow the heap
tonyp
parents:
2433
diff
changeset
|
2292 } else { |
49a67202bc67
7011855: G1: non-product flag to artificially grow the heap
tonyp
parents:
2433
diff
changeset
|
2293 // 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
|
2294 // again. Let's get out of the loop. |
49a67202bc67
7011855: G1: non-product flag to artificially grow the heap
tonyp
parents:
2433
diff
changeset
|
2295 break; |
49a67202bc67
7011855: G1: non-product flag to artificially grow the heap
tonyp
parents:
2433
diff
changeset
|
2296 } |
49a67202bc67
7011855: G1: non-product flag to artificially grow the heap
tonyp
parents:
2433
diff
changeset
|
2297 } |
49a67202bc67
7011855: G1: non-product flag to artificially grow the heap
tonyp
parents:
2433
diff
changeset
|
2298 } |
49a67202bc67
7011855: G1: non-product flag to artificially grow the heap
tonyp
parents:
2433
diff
changeset
|
2299 #endif // !PRODUCT |
49a67202bc67
7011855: G1: non-product flag to artificially grow the heap
tonyp
parents:
2433
diff
changeset
|
2300 |
2030
fb712ff22571
7000559: G1: assertion failure !outer || (full_collections_started == _full_collections_completed + 1)
tonyp
parents:
1995
diff
changeset
|
2301 void G1CollectedHeap::increment_full_collections_completed(bool concurrent) { |
1656
4e5661ba9d98
6944166: G1: explicit GCs are not always handled correctly
tonyp
parents:
1611
diff
changeset
|
2302 MonitorLockerEx x(FullGCCount_lock, Mutex::_no_safepoint_check_flag); |
4e5661ba9d98
6944166: G1: explicit GCs are not always handled correctly
tonyp
parents:
1611
diff
changeset
|
2303 |
2030
fb712ff22571
7000559: G1: assertion failure !outer || (full_collections_started == _full_collections_completed + 1)
tonyp
parents:
1995
diff
changeset
|
2304 // 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
|
2305 // 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
|
2306 // 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
|
2307 // assert here. |
fb712ff22571
7000559: G1: assertion failure !outer || (full_collections_started == _full_collections_completed + 1)
tonyp
parents:
1995
diff
changeset
|
2308 |
1656
4e5661ba9d98
6944166: G1: explicit GCs are not always handled correctly
tonyp
parents:
1611
diff
changeset
|
2309 // 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
|
2310 // 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
|
2311 // collections have been started. |
4e5661ba9d98
6944166: G1: explicit GCs are not always handled correctly
tonyp
parents:
1611
diff
changeset
|
2312 unsigned int full_collections_started = total_full_collections(); |
4e5661ba9d98
6944166: G1: explicit GCs are not always handled correctly
tonyp
parents:
1611
diff
changeset
|
2313 |
4e5661ba9d98
6944166: G1: explicit GCs are not always handled correctly
tonyp
parents:
1611
diff
changeset
|
2314 // 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
|
2315 // 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
|
2316 // interrupt a concurrent cycle), the number of full collections |
4e5661ba9d98
6944166: G1: explicit GCs are not always handled correctly
tonyp
parents:
1611
diff
changeset
|
2317 // 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
|
2318 // 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
|
2319 // behind the number of full collections started. |
4e5661ba9d98
6944166: G1: explicit GCs are not always handled correctly
tonyp
parents:
1611
diff
changeset
|
2320 |
4e5661ba9d98
6944166: G1: explicit GCs are not always handled correctly
tonyp
parents:
1611
diff
changeset
|
2321 // 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
|
2322 assert(concurrent || |
1656
4e5661ba9d98
6944166: G1: explicit GCs are not always handled correctly
tonyp
parents:
1611
diff
changeset
|
2323 (full_collections_started == _full_collections_completed + 1) || |
4e5661ba9d98
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2324 (full_collections_started == _full_collections_completed + 2), |
2030
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7000559: G1: assertion failure !outer || (full_collections_started == _full_collections_completed + 1)
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|
2325 err_msg("for inner caller (Full GC): full_collections_started = %u " |
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|
2326 "is inconsistent with _full_collections_completed = %u", |
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|
2327 full_collections_started, _full_collections_completed)); |
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|
2328 |
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|
2329 // This is the case for the outer caller, i.e. the concurrent cycle. |
2030
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7000559: G1: assertion failure !outer || (full_collections_started == _full_collections_completed + 1)
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|
2330 assert(!concurrent || |
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|
2331 (full_collections_started == _full_collections_completed + 1), |
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|
2332 err_msg("for outer caller (concurrent cycle): " |
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|
2333 "full_collections_started = %u " |
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2334 "is inconsistent with _full_collections_completed = %u", |
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|
2335 full_collections_started, _full_collections_completed)); |
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|
2336 |
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|
2337 _full_collections_completed += 1; |
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|
2338 |
1840
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2339 // We need to clear the "in_progress" flag in the CM thread before |
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|
2340 // we wake up any waiters (especially when ExplicitInvokesConcurrent |
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|
2341 // is set) so that if a waiter requests another System.gc() it doesn't |
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|
2342 // incorrectly see that a marking cyle is still in progress. |
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2343 if (concurrent) { |
1840
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2344 _cmThread->clear_in_progress(); |
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|
2345 } |
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|
2346 |
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|
2347 // This notify_all() will ensure that a thread that called |
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2348 // System.gc() with (with ExplicitGCInvokesConcurrent set or not) |
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2349 // and it's waiting for a full GC to finish will be woken up. It is |
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2350 // waiting in VM_G1IncCollectionPause::doit_epilogue(). |
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|
2351 FullGCCount_lock->notify_all(); |
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|
2352 } |
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|
2353 |
342 | 2354 void G1CollectedHeap::collect_as_vm_thread(GCCause::Cause cause) { |
2152 | 2355 assert_at_safepoint(true /* should_be_vm_thread */); |
342 | 2356 GCCauseSetter gcs(this, cause); |
2357 switch (cause) { | |
2358 case GCCause::_heap_inspection: | |
2359 case GCCause::_heap_dump: { | |
2360 HandleMark hm; | |
2361 do_full_collection(false); // don't clear all soft refs | |
2362 break; | |
2363 } | |
2364 default: // XXX FIX ME | |
2365 ShouldNotReachHere(); // Unexpected use of this function | |
2366 } | |
2367 } | |
2368 | |
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|
2369 void G1CollectedHeap::collect(GCCause::Cause cause) { |
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2370 // The caller doesn't have the Heap_lock |
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|
2371 assert(!Heap_lock->owned_by_self(), "this thread should not own the Heap_lock"); |
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|
2372 |
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|
2373 unsigned int gc_count_before; |
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|
2374 unsigned int full_gc_count_before; |
342 | 2375 { |
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|
2376 MutexLocker ml(Heap_lock); |
1973 | 2377 |
1088
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|
2378 // Read the GC count while holding the Heap_lock |
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|
2379 gc_count_before = SharedHeap::heap()->total_collections(); |
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2380 full_gc_count_before = SharedHeap::heap()->total_full_collections(); |
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|
2381 } |
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|
2382 |
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|
2383 if (should_do_concurrent_full_gc(cause)) { |
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|
2384 // Schedule an initial-mark evacuation pause that will start a |
1973 | 2385 // concurrent cycle. We're setting word_size to 0 which means that |
2386 // we are not requesting a post-GC allocation. | |
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|
2387 VM_G1IncCollectionPause op(gc_count_before, |
1973 | 2388 0, /* word_size */ |
2389 true, /* should_initiate_conc_mark */ | |
1656
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|
2390 g1_policy()->max_pause_time_ms(), |
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|
2391 cause); |
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|
2392 VMThread::execute(&op); |
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|
2393 } else { |
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|
2394 if (cause == GCCause::_gc_locker |
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|
2395 DEBUG_ONLY(|| cause == GCCause::_scavenge_alot)) { |
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|
2396 |
1973 | 2397 // Schedule a standard evacuation pause. We're setting word_size |
2398 // to 0 which means that we are not requesting a post-GC allocation. | |
1656
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|
2399 VM_G1IncCollectionPause op(gc_count_before, |
1973 | 2400 0, /* word_size */ |
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|
2401 false, /* should_initiate_conc_mark */ |
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|
2402 g1_policy()->max_pause_time_ms(), |
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|
2403 cause); |
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|
2404 VMThread::execute(&op); |
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|
2405 } else { |
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|
2406 // Schedule a Full GC. |
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|
2407 VM_G1CollectFull op(gc_count_before, full_gc_count_before, cause); |
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|
2408 VMThread::execute(&op); |
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|
2409 } |
342 | 2410 } |
2411 } | |
2412 | |
2413 bool G1CollectedHeap::is_in(const void* p) const { | |
3766 | 2414 HeapRegion* hr = _hrs.addr_to_region((HeapWord*) p); |
2415 if (hr != NULL) { | |
342 | 2416 return hr->is_in(p); |
2417 } else { | |
2418 return _perm_gen->as_gen()->is_in(p); | |
2419 } | |
2420 } | |
2421 | |
2422 // Iteration functions. | |
2423 | |
2424 // Iterates an OopClosure over all ref-containing fields of objects | |
2425 // within a HeapRegion. | |
2426 | |
2427 class IterateOopClosureRegionClosure: public HeapRegionClosure { | |
2428 MemRegion _mr; | |
2429 OopClosure* _cl; | |
2430 public: | |
2431 IterateOopClosureRegionClosure(MemRegion mr, OopClosure* cl) | |
2432 : _mr(mr), _cl(cl) {} | |
2433 bool doHeapRegion(HeapRegion* r) { | |
2434 if (! r->continuesHumongous()) { | |
2435 r->oop_iterate(_cl); | |
2436 } | |
2437 return false; | |
2438 } | |
2439 }; | |
2440 | |
678 | 2441 void G1CollectedHeap::oop_iterate(OopClosure* cl, bool do_perm) { |
342 | 2442 IterateOopClosureRegionClosure blk(_g1_committed, cl); |
3766 | 2443 heap_region_iterate(&blk); |
678 | 2444 if (do_perm) { |
2445 perm_gen()->oop_iterate(cl); | |
2446 } | |
342 | 2447 } |
2448 | |
678 | 2449 void G1CollectedHeap::oop_iterate(MemRegion mr, OopClosure* cl, bool do_perm) { |
342 | 2450 IterateOopClosureRegionClosure blk(mr, cl); |
3766 | 2451 heap_region_iterate(&blk); |
678 | 2452 if (do_perm) { |
2453 perm_gen()->oop_iterate(cl); | |
2454 } | |
342 | 2455 } |
2456 | |
2457 // Iterates an ObjectClosure over all objects within a HeapRegion. | |
2458 | |
2459 class IterateObjectClosureRegionClosure: public HeapRegionClosure { | |
2460 ObjectClosure* _cl; | |
2461 public: | |
2462 IterateObjectClosureRegionClosure(ObjectClosure* cl) : _cl(cl) {} | |
2463 bool doHeapRegion(HeapRegion* r) { | |
2464 if (! r->continuesHumongous()) { | |
2465 r->object_iterate(_cl); | |
2466 } | |
2467 return false; | |
2468 } | |
2469 }; | |
2470 | |
678 | 2471 void G1CollectedHeap::object_iterate(ObjectClosure* cl, bool do_perm) { |
342 | 2472 IterateObjectClosureRegionClosure blk(cl); |
3766 | 2473 heap_region_iterate(&blk); |
678 | 2474 if (do_perm) { |
2475 perm_gen()->object_iterate(cl); | |
2476 } | |
342 | 2477 } |
2478 | |
2479 void G1CollectedHeap::object_iterate_since_last_GC(ObjectClosure* cl) { | |
2480 // FIXME: is this right? | |
2481 guarantee(false, "object_iterate_since_last_GC not supported by G1 heap"); | |
2482 } | |
2483 | |
2484 // Calls a SpaceClosure on a HeapRegion. | |
2485 | |
2486 class SpaceClosureRegionClosure: public HeapRegionClosure { | |
2487 SpaceClosure* _cl; | |
2488 public: | |
2489 SpaceClosureRegionClosure(SpaceClosure* cl) : _cl(cl) {} | |
2490 bool doHeapRegion(HeapRegion* r) { | |
2491 _cl->do_space(r); | |
2492 return false; | |
2493 } | |
2494 }; | |
2495 | |
2496 void G1CollectedHeap::space_iterate(SpaceClosure* cl) { | |
2497 SpaceClosureRegionClosure blk(cl); | |
3766 | 2498 heap_region_iterate(&blk); |
342 | 2499 } |
2500 | |
3766 | 2501 void G1CollectedHeap::heap_region_iterate(HeapRegionClosure* cl) const { |
2502 _hrs.iterate(cl); | |
342 | 2503 } |
2504 | |
2505 void G1CollectedHeap::heap_region_iterate_from(HeapRegion* r, | |
3766 | 2506 HeapRegionClosure* cl) const { |
2507 _hrs.iterate_from(r, cl); | |
342 | 2508 } |
2509 | |
2510 void | |
2511 G1CollectedHeap::heap_region_par_iterate_chunked(HeapRegionClosure* cl, | |
2512 int worker, | |
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|
2513 int no_of_par_workers, |
342 | 2514 jint claim_value) { |
355 | 2515 const size_t regions = n_regions(); |
4095
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|
2516 const size_t max_workers = (G1CollectedHeap::use_parallel_gc_threads() ? |
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|
2517 no_of_par_workers : |
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4090
diff
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|
2518 1); |
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diff
changeset
|
2519 assert(UseDynamicNumberOfGCThreads || |
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|
2520 no_of_par_workers == workers()->total_workers(), |
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diff
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|
2521 "Non dynamic should use fixed number of workers"); |
355 | 2522 // try to spread out the starting points of the workers |
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diff
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|
2523 const size_t start_index = regions / max_workers * (size_t) worker; |
355 | 2524 |
2525 // each worker will actually look at all regions | |
2526 for (size_t count = 0; count < regions; ++count) { | |
2527 const size_t index = (start_index + count) % regions; | |
2528 assert(0 <= index && index < regions, "sanity"); | |
2529 HeapRegion* r = region_at(index); | |
2530 // we'll ignore "continues humongous" regions (we'll process them | |
2531 // when we come across their corresponding "start humongous" | |
2532 // region) and regions already claimed | |
2533 if (r->claim_value() == claim_value || r->continuesHumongous()) { | |
2534 continue; | |
2535 } | |
2536 // OK, try to claim it | |
342 | 2537 if (r->claimHeapRegion(claim_value)) { |
355 | 2538 // success! |
2539 assert(!r->continuesHumongous(), "sanity"); | |
2540 if (r->startsHumongous()) { | |
2541 // If the region is "starts humongous" we'll iterate over its | |
2542 // "continues humongous" first; in fact we'll do them | |
2543 // first. The order is important. In on case, calling the | |
2544 // closure on the "starts humongous" region might de-allocate | |
2545 // and clear all its "continues humongous" regions and, as a | |
2546 // result, we might end up processing them twice. So, we'll do | |
2547 // them first (notice: most closures will ignore them anyway) and | |
2548 // then we'll do the "starts humongous" region. | |
2549 for (size_t ch_index = index + 1; ch_index < regions; ++ch_index) { | |
2550 HeapRegion* chr = region_at(ch_index); | |
2551 | |
2552 // if the region has already been claimed or it's not | |
2553 // "continues humongous" we're done | |
2554 if (chr->claim_value() == claim_value || | |
2555 !chr->continuesHumongous()) { | |
2556 break; | |
2557 } | |
2558 | |
2559 // Noone should have claimed it directly. We can given | |
2560 // that we claimed its "starts humongous" region. | |
2561 assert(chr->claim_value() != claim_value, "sanity"); | |
2562 assert(chr->humongous_start_region() == r, "sanity"); | |
2563 | |
2564 if (chr->claimHeapRegion(claim_value)) { | |
2565 // we should always be able to claim it; noone else should | |
2566 // be trying to claim this region | |
2567 | |
2568 bool res2 = cl->doHeapRegion(chr); | |
2569 assert(!res2, "Should not abort"); | |
2570 | |
2571 // Right now, this holds (i.e., no closure that actually | |
2572 // does something with "continues humongous" regions | |
2573 // clears them). We might have to weaken it in the future, | |
2574 // but let's leave these two asserts here for extra safety. | |
2575 assert(chr->continuesHumongous(), "should still be the case"); | |
2576 assert(chr->humongous_start_region() == r, "sanity"); | |
2577 } else { | |
2578 guarantee(false, "we should not reach here"); | |
2579 } | |
2580 } | |
2581 } | |
2582 | |
2583 assert(!r->continuesHumongous(), "sanity"); | |
2584 bool res = cl->doHeapRegion(r); | |
2585 assert(!res, "Should not abort"); | |
2586 } | |
2587 } | |
2588 } | |
2589 | |
390 | 2590 class ResetClaimValuesClosure: public HeapRegionClosure { |
2591 public: | |
2592 bool doHeapRegion(HeapRegion* r) { | |
2593 r->set_claim_value(HeapRegion::InitialClaimValue); | |
2594 return false; | |
2595 } | |
2596 }; | |
2597 | |
2598 void | |
2599 G1CollectedHeap::reset_heap_region_claim_values() { | |
2600 ResetClaimValuesClosure blk; | |
2601 heap_region_iterate(&blk); | |
2602 } | |
2603 | |
355 | 2604 #ifdef ASSERT |
2605 // This checks whether all regions in the heap have the correct claim | |
2606 // value. I also piggy-backed on this a check to ensure that the | |
2607 // humongous_start_region() information on "continues humongous" | |
2608 // regions is correct. | |
2609 | |
2610 class CheckClaimValuesClosure : public HeapRegionClosure { | |
2611 private: | |
2612 jint _claim_value; | |
2613 size_t _failures; | |
2614 HeapRegion* _sh_region; | |
2615 public: | |
2616 CheckClaimValuesClosure(jint claim_value) : | |
2617 _claim_value(claim_value), _failures(0), _sh_region(NULL) { } | |
2618 bool doHeapRegion(HeapRegion* r) { | |
2619 if (r->claim_value() != _claim_value) { | |
2620 gclog_or_tty->print_cr("Region ["PTR_FORMAT","PTR_FORMAT"), " | |
2621 "claim value = %d, should be %d", | |
2622 r->bottom(), r->end(), r->claim_value(), | |
2623 _claim_value); | |
2624 ++_failures; | |
2625 } | |
2626 if (!r->isHumongous()) { | |
2627 _sh_region = NULL; | |
2628 } else if (r->startsHumongous()) { | |
2629 _sh_region = r; | |
2630 } else if (r->continuesHumongous()) { | |
2631 if (r->humongous_start_region() != _sh_region) { | |
2632 gclog_or_tty->print_cr("Region ["PTR_FORMAT","PTR_FORMAT"), " | |
2633 "HS = "PTR_FORMAT", should be "PTR_FORMAT, | |
2634 r->bottom(), r->end(), | |
2635 r->humongous_start_region(), | |
2636 _sh_region); | |
2637 ++_failures; | |
342 | 2638 } |
2639 } | |
355 | 2640 return false; |
2641 } | |
2642 size_t failures() { | |
2643 return _failures; | |
2644 } | |
2645 }; | |
2646 | |
2647 bool G1CollectedHeap::check_heap_region_claim_values(jint claim_value) { | |
2648 CheckClaimValuesClosure cl(claim_value); | |
2649 heap_region_iterate(&cl); | |
2650 return cl.failures() == 0; | |
2651 } | |
2652 #endif // ASSERT | |
342 | 2653 |
2654 void G1CollectedHeap::collection_set_iterate(HeapRegionClosure* cl) { | |
2655 HeapRegion* r = g1_policy()->collection_set(); | |
2656 while (r != NULL) { | |
2657 HeapRegion* next = r->next_in_collection_set(); | |
2658 if (cl->doHeapRegion(r)) { | |
2659 cl->incomplete(); | |
2660 return; | |
2661 } | |
2662 r = next; | |
2663 } | |
2664 } | |
2665 | |
2666 void G1CollectedHeap::collection_set_iterate_from(HeapRegion* r, | |
2667 HeapRegionClosure *cl) { | |
1656
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2668 if (r == NULL) { |
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2669 // The CSet is empty so there's nothing to do. |
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|
2670 return; |
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|
2671 } |
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|
2672 |
342 | 2673 assert(r->in_collection_set(), |
2674 "Start region must be a member of the collection set."); | |
2675 HeapRegion* cur = r; | |
2676 while (cur != NULL) { | |
2677 HeapRegion* next = cur->next_in_collection_set(); | |
2678 if (cl->doHeapRegion(cur) && false) { | |
2679 cl->incomplete(); | |
2680 return; | |
2681 } | |
2682 cur = next; | |
2683 } | |
2684 cur = g1_policy()->collection_set(); | |
2685 while (cur != r) { | |
2686 HeapRegion* next = cur->next_in_collection_set(); | |
2687 if (cl->doHeapRegion(cur) && false) { | |
2688 cl->incomplete(); | |
2689 return; | |
2690 } | |
2691 cur = next; | |
2692 } | |
2693 } | |
2694 | |
2695 CompactibleSpace* G1CollectedHeap::first_compactible_space() { | |
3766 | 2696 return n_regions() > 0 ? region_at(0) : NULL; |
342 | 2697 } |
2698 | |
2699 | |
2700 Space* G1CollectedHeap::space_containing(const void* addr) const { | |
2701 Space* res = heap_region_containing(addr); | |
2702 if (res == NULL) | |
2703 res = perm_gen()->space_containing(addr); | |
2704 return res; | |
2705 } | |
2706 | |
2707 HeapWord* G1CollectedHeap::block_start(const void* addr) const { | |
2708 Space* sp = space_containing(addr); | |
2709 if (sp != NULL) { | |
2710 return sp->block_start(addr); | |
2711 } | |
2712 return NULL; | |
2713 } | |
2714 | |
2715 size_t G1CollectedHeap::block_size(const HeapWord* addr) const { | |
2716 Space* sp = space_containing(addr); | |
2717 assert(sp != NULL, "block_size of address outside of heap"); | |
2718 return sp->block_size(addr); | |
2719 } | |
2720 | |
2721 bool G1CollectedHeap::block_is_obj(const HeapWord* addr) const { | |
2722 Space* sp = space_containing(addr); | |
2723 return sp->block_is_obj(addr); | |
2724 } | |
2725 | |
2726 bool G1CollectedHeap::supports_tlab_allocation() const { | |
2727 return true; | |
2728 } | |
2729 | |
2730 size_t G1CollectedHeap::tlab_capacity(Thread* ignored) const { | |
2731 return HeapRegion::GrainBytes; | |
2732 } | |
2733 | |
2734 size_t G1CollectedHeap::unsafe_max_tlab_alloc(Thread* ignored) const { | |
2735 // Return the remaining space in the cur alloc region, but not less than | |
2736 // the min TLAB size. | |
1313
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2737 |
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2738 // Also, this value can be at most the humongous object threshold, |
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2739 // since we can't allow tlabs to grow big enough to accomodate |
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2740 // humongous objects. |
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|
2741 |
2433
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|
2742 HeapRegion* hr = _mutator_alloc_region.get(); |
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2743 size_t max_tlab_size = _humongous_object_threshold_in_words * wordSize; |
2433
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2744 if (hr == NULL) { |
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2745 return max_tlab_size; |
342 | 2746 } else { |
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|
2747 return MIN2(MAX2(hr->free(), (size_t) MinTLABSize), max_tlab_size); |
342 | 2748 } |
2749 } | |
2750 | |
2751 size_t G1CollectedHeap::max_capacity() const { | |
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6923430: G1: assert(res != 0,"This should have worked.")
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|
2752 return _g1_reserved.byte_size(); |
342 | 2753 } |
2754 | |
2755 jlong G1CollectedHeap::millis_since_last_gc() { | |
2756 // assert(false, "NYI"); | |
2757 return 0; | |
2758 } | |
2759 | |
2760 void G1CollectedHeap::prepare_for_verify() { | |
2761 if (SafepointSynchronize::is_at_safepoint() || ! UseTLAB) { | |
2762 ensure_parsability(false); | |
2763 } | |
2764 g1_rem_set()->prepare_for_verify(); | |
2765 } | |
2766 | |
2767 class VerifyLivenessOopClosure: public OopClosure { | |
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2768 G1CollectedHeap* _g1h; |
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|
2769 VerifyOption _vo; |
342 | 2770 public: |
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|
2771 VerifyLivenessOopClosure(G1CollectedHeap* g1h, VerifyOption vo): |
6747fd0512e0
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2772 _g1h(g1h), _vo(vo) |
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|
2773 { } |
845
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|
2774 void do_oop(narrowOop *p) { do_oop_work(p); } |
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2775 void do_oop( oop *p) { do_oop_work(p); } |
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|
2776 |
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2777 template <class T> void do_oop_work(T *p) { |
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6700789: G1: Enable use of compressed oops with G1 heaps
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2778 oop obj = oopDesc::load_decode_heap_oop(p); |
3772
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|
2779 guarantee(obj == NULL || !_g1h->is_obj_dead_cond(obj, _vo), |
845
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diff
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|
2780 "Dead object referenced by a not dead object"); |
342 | 2781 } |
2782 }; | |
2783 | |
2784 class VerifyObjsInRegionClosure: public ObjectClosure { | |
811 | 2785 private: |
342 | 2786 G1CollectedHeap* _g1h; |
2787 size_t _live_bytes; | |
2788 HeapRegion *_hr; | |
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|
2789 VerifyOption _vo; |
342 | 2790 public: |
3772
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diff
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|
2791 // _vo == UsePrevMarking -> use "prev" marking information, |
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|
2792 // _vo == UseNextMarking -> use "next" marking information, |
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|
2793 // _vo == UseMarkWord -> use mark word from object header. |
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diff
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|
2794 VerifyObjsInRegionClosure(HeapRegion *hr, VerifyOption vo) |
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|
2795 : _live_bytes(0), _hr(hr), _vo(vo) { |
342 | 2796 _g1h = G1CollectedHeap::heap(); |
2797 } | |
2798 void do_object(oop o) { | |
3772
6747fd0512e0
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3766
diff
changeset
|
2799 VerifyLivenessOopClosure isLive(_g1h, _vo); |
342 | 2800 assert(o != NULL, "Huh?"); |
3772
6747fd0512e0
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diff
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|
2801 if (!_g1h->is_obj_dead_cond(o, _vo)) { |
6747fd0512e0
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|
2802 // If the object is alive according to the mark word, |
6747fd0512e0
7004681: G1: Extend marking verification to Full GCs
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3766
diff
changeset
|
2803 // then verify that the marking information agrees. |
6747fd0512e0
7004681: G1: Extend marking verification to Full GCs
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diff
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|
2804 // Note we can't verify the contra-positive of the |
6747fd0512e0
7004681: G1: Extend marking verification to Full GCs
johnc
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diff
changeset
|
2805 // above: if the object is dead (according to the mark |
6747fd0512e0
7004681: G1: Extend marking verification to Full GCs
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diff
changeset
|
2806 // word), it may not be marked, or may have been marked |
6747fd0512e0
7004681: G1: Extend marking verification to Full GCs
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diff
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|
2807 // but has since became dead, or may have been allocated |
6747fd0512e0
7004681: G1: Extend marking verification to Full GCs
johnc
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3766
diff
changeset
|
2808 // since the last marking. |
6747fd0512e0
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diff
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|
2809 if (_vo == VerifyOption_G1UseMarkWord) { |
6747fd0512e0
7004681: G1: Extend marking verification to Full GCs
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diff
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|
2810 guarantee(!_g1h->is_obj_dead(o), "mark word and concurrent mark mismatch"); |
6747fd0512e0
7004681: G1: Extend marking verification to Full GCs
johnc
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3766
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|
2811 } |
6747fd0512e0
7004681: G1: Extend marking verification to Full GCs
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diff
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|
2812 |
342 | 2813 o->oop_iterate(&isLive); |
1389
5dbd9300cf9c
6943926: G1: Integer overflow during heap region verification
johnc
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1388
diff
changeset
|
2814 if (!_hr->obj_allocated_since_prev_marking(o)) { |
5dbd9300cf9c
6943926: G1: Integer overflow during heap region verification
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1388
diff
changeset
|
2815 size_t obj_size = o->size(); // Make sure we don't overflow |
5dbd9300cf9c
6943926: G1: Integer overflow during heap region verification
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1388
diff
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|
2816 _live_bytes += (obj_size * HeapWordSize); |
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diff
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|
2817 } |
342 | 2818 } |
2819 } | |
2820 size_t live_bytes() { return _live_bytes; } | |
2821 }; | |
2822 | |
2823 class PrintObjsInRegionClosure : public ObjectClosure { | |
2824 HeapRegion *_hr; | |
2825 G1CollectedHeap *_g1; | |
2826 public: | |
2827 PrintObjsInRegionClosure(HeapRegion *hr) : _hr(hr) { | |
2828 _g1 = G1CollectedHeap::heap(); | |
2829 }; | |
2830 | |
2831 void do_object(oop o) { | |
2832 if (o != NULL) { | |
2833 HeapWord *start = (HeapWord *) o; | |
2834 size_t word_sz = o->size(); | |
2835 gclog_or_tty->print("\nPrinting obj "PTR_FORMAT" of size " SIZE_FORMAT | |
2836 " isMarkedPrev %d isMarkedNext %d isAllocSince %d\n", | |
2837 (void*) o, word_sz, | |
2838 _g1->isMarkedPrev(o), | |
2839 _g1->isMarkedNext(o), | |
2840 _hr->obj_allocated_since_prev_marking(o)); | |
2841 HeapWord *end = start + word_sz; | |
2842 HeapWord *cur; | |
2843 int *val; | |
2844 for (cur = start; cur < end; cur++) { | |
2845 val = (int *) cur; | |
2846 gclog_or_tty->print("\t "PTR_FORMAT":"PTR_FORMAT"\n", val, *val); | |
2847 } | |
2848 } | |
2849 } | |
2850 }; | |
2851 | |
2852 class VerifyRegionClosure: public HeapRegionClosure { | |
811 | 2853 private: |
3772
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7004681: G1: Extend marking verification to Full GCs
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diff
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|
2854 bool _allow_dirty; |
6747fd0512e0
7004681: G1: Extend marking verification to Full GCs
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diff
changeset
|
2855 bool _par; |
6747fd0512e0
7004681: G1: Extend marking verification to Full GCs
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diff
changeset
|
2856 VerifyOption _vo; |
6747fd0512e0
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diff
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|
2857 bool _failures; |
811 | 2858 public: |
3772
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diff
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|
2859 // _vo == UsePrevMarking -> use "prev" marking information, |
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diff
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|
2860 // _vo == UseNextMarking -> use "next" marking information, |
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diff
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|
2861 // _vo == UseMarkWord -> use mark word from object header. |
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diff
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|
2862 VerifyRegionClosure(bool allow_dirty, bool par, VerifyOption vo) |
845
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2863 : _allow_dirty(allow_dirty), |
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6700789: G1: Enable use of compressed oops with G1 heaps
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|
2864 _par(par), |
3772
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diff
changeset
|
2865 _vo(vo), |
1020
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1019
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|
2866 _failures(false) {} |
ff2402f6a50b
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|
2867 |
ff2402f6a50b
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|
2868 bool failures() { |
ff2402f6a50b
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1019
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|
2869 return _failures; |
ff2402f6a50b
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|
2870 } |
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|
2871 |
342 | 2872 bool doHeapRegion(HeapRegion* r) { |
390 | 2873 guarantee(_par || r->claim_value() == HeapRegion::InitialClaimValue, |
2874 "Should be unclaimed at verify points."); | |
637
25e146966e7c
6817419: G1: Enable extensive verification for humongous regions
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diff
changeset
|
2875 if (!r->continuesHumongous()) { |
1020
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diff
changeset
|
2876 bool failures = false; |
3772
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|
2877 r->verify(_allow_dirty, _vo, &failures); |
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|
2878 if (failures) { |
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diff
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|
2879 _failures = true; |
ff2402f6a50b
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|
2880 } else { |
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|
2881 VerifyObjsInRegionClosure not_dead_yet_cl(r, _vo); |
1020
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changeset
|
2882 r->object_iterate(¬_dead_yet_cl); |
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diff
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|
2883 if (r->max_live_bytes() < not_dead_yet_cl.live_bytes()) { |
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|
2884 gclog_or_tty->print_cr("["PTR_FORMAT","PTR_FORMAT"] " |
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|
2885 "max_live_bytes "SIZE_FORMAT" " |
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diff
changeset
|
2886 "< calculated "SIZE_FORMAT, |
ff2402f6a50b
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changeset
|
2887 r->bottom(), r->end(), |
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changeset
|
2888 r->max_live_bytes(), |
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2889 not_dead_yet_cl.live_bytes()); |
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2890 _failures = true; |
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2891 } |
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2892 } |
342 | 2893 } |
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2894 return false; // stop the region iteration if we hit a failure |
342 | 2895 } |
2896 }; | |
2897 | |
2898 class VerifyRootsClosure: public OopsInGenClosure { | |
2899 private: | |
2900 G1CollectedHeap* _g1h; | |
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2901 VerifyOption _vo; |
342 | 2902 bool _failures; |
2903 public: | |
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2904 // _vo == UsePrevMarking -> use "prev" marking information, |
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2905 // _vo == UseNextMarking -> use "next" marking information, |
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2906 // _vo == UseMarkWord -> use mark word from object header. |
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2907 VerifyRootsClosure(VerifyOption vo) : |
845
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2908 _g1h(G1CollectedHeap::heap()), |
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2909 _vo(vo), |
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2910 _failures(false) { } |
342 | 2911 |
2912 bool failures() { return _failures; } | |
2913 | |
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2914 template <class T> void do_oop_nv(T* p) { |
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2915 T heap_oop = oopDesc::load_heap_oop(p); |
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2916 if (!oopDesc::is_null(heap_oop)) { |
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2917 oop obj = oopDesc::decode_heap_oop_not_null(heap_oop); |
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2918 if (_g1h->is_obj_dead_cond(obj, _vo)) { |
342 | 2919 gclog_or_tty->print_cr("Root location "PTR_FORMAT" " |
1020
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2920 "points to dead obj "PTR_FORMAT, p, (void*) obj); |
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2921 if (_vo == VerifyOption_G1UseMarkWord) { |
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2922 gclog_or_tty->print_cr(" Mark word: "PTR_FORMAT, (void*)(obj->mark())); |
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2923 } |
342 | 2924 obj->print_on(gclog_or_tty); |
2925 _failures = true; | |
2926 } | |
2927 } | |
2928 } | |
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2929 |
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2930 void do_oop(oop* p) { do_oop_nv(p); } |
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2931 void do_oop(narrowOop* p) { do_oop_nv(p); } |
342 | 2932 }; |
2933 | |
390 | 2934 // This is the task used for parallel heap verification. |
2935 | |
2936 class G1ParVerifyTask: public AbstractGangTask { | |
2937 private: | |
2938 G1CollectedHeap* _g1h; | |
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2939 bool _allow_dirty; |
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2940 VerifyOption _vo; |
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2941 bool _failures; |
390 | 2942 |
2943 public: | |
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2944 // _vo == UsePrevMarking -> use "prev" marking information, |
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2945 // _vo == UseNextMarking -> use "next" marking information, |
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2946 // _vo == UseMarkWord -> use mark word from object header. |
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2947 G1ParVerifyTask(G1CollectedHeap* g1h, bool allow_dirty, VerifyOption vo) : |
390 | 2948 AbstractGangTask("Parallel verify task"), |
845
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2949 _g1h(g1h), |
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2950 _allow_dirty(allow_dirty), |
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2951 _vo(vo), |
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2952 _failures(false) { } |
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2953 |
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2954 bool failures() { |
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2955 return _failures; |
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2956 } |
390 | 2957 |
2958 void work(int worker_i) { | |
637
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2959 HandleMark hm; |
3772
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2960 VerifyRegionClosure blk(_allow_dirty, true, _vo); |
390 | 2961 _g1h->heap_region_par_iterate_chunked(&blk, worker_i, |
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2962 _g1h->workers()->active_workers(), |
390 | 2963 HeapRegion::ParVerifyClaimValue); |
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2964 if (blk.failures()) { |
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2965 _failures = true; |
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2966 } |
390 | 2967 } |
2968 }; | |
2969 | |
342 | 2970 void G1CollectedHeap::verify(bool allow_dirty, bool silent) { |
3772
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2971 verify(allow_dirty, silent, VerifyOption_G1UsePrevMarking); |
811 | 2972 } |
2973 | |
2974 void G1CollectedHeap::verify(bool allow_dirty, | |
2975 bool silent, | |
3772
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2976 VerifyOption vo) { |
342 | 2977 if (SafepointSynchronize::is_at_safepoint() || ! UseTLAB) { |
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2978 if (!silent) { gclog_or_tty->print("Roots (excluding permgen) "); } |
3772
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2979 VerifyRootsClosure rootsCl(vo); |
4095
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2980 |
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2981 assert(Thread::current()->is_VM_thread(), |
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2982 "Expected to be executed serially by the VM thread at this point"); |
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2983 |
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2984 CodeBlobToOopClosure blobsCl(&rootsCl, /*do_marking=*/ false); |
3772
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2985 |
3293
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2986 // We apply the relevant closures to all the oops in the |
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2987 // system dictionary, the string table and the code cache. |
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2988 const int so = SharedHeap::SO_AllClasses | SharedHeap::SO_Strings | SharedHeap::SO_CodeCache; |
3772
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|
2989 |
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|
2990 process_strong_roots(true, // activate StrongRootsScope |
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2991 true, // we set "collecting perm gen" to true, |
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2992 // so we don't reset the dirty cards in the perm gen. |
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|
2993 SharedHeap::ScanningOption(so), // roots scanning options |
342 | 2994 &rootsCl, |
989
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2995 &blobsCl, |
342 | 2996 &rootsCl); |
3772
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|
2997 |
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|
2998 // If we're verifying after the marking phase of a Full GC then we can't |
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|
2999 // treat the perm gen as roots into the G1 heap. Some of the objects in |
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|
3000 // the perm gen may be dead and hence not marked. If one of these dead |
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3001 // objects is considered to be a root then we may end up with a false |
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|
3002 // "Root location <x> points to dead ob <y>" failure. |
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|
3003 if (vo != VerifyOption_G1UseMarkWord) { |
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|
3004 // Since we used "collecting_perm_gen" == true above, we will not have |
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|
3005 // checked the refs from perm into the G1-collected heap. We check those |
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|
3006 // references explicitly below. Whether the relevant cards are dirty |
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|
3007 // is checked further below in the rem set verification. |
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|
3008 if (!silent) { gclog_or_tty->print("Permgen roots "); } |
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|
3009 perm_gen()->oop_iterate(&rootsCl); |
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|
3010 } |
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|
3011 bool failures = rootsCl.failures(); |
3772
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|
3012 |
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|
3013 if (vo != VerifyOption_G1UseMarkWord) { |
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|
3014 // If we're verifying during a full GC then the region sets |
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|
3015 // will have been torn down at the start of the GC. Therefore |
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|
3016 // verifying the region sets will fail. So we only verify |
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|
3017 // the region sets when not in a full GC. |
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|
3018 if (!silent) { gclog_or_tty->print("HeapRegionSets "); } |
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|
3019 verify_region_sets(); |
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|
3020 } |
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|
3021 |
2152 | 3022 if (!silent) { gclog_or_tty->print("HeapRegions "); } |
390 | 3023 if (GCParallelVerificationEnabled && ParallelGCThreads > 1) { |
3024 assert(check_heap_region_claim_values(HeapRegion::InitialClaimValue), | |
3025 "sanity check"); | |
3026 | |
3772
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|
3027 G1ParVerifyTask task(this, allow_dirty, vo); |
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|
3028 assert(UseDynamicNumberOfGCThreads || |
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|
3029 workers()->active_workers() == workers()->total_workers(), |
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|
3030 "If not dynamic should be using all the workers"); |
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|
3031 int n_workers = workers()->active_workers(); |
390 | 3032 set_par_threads(n_workers); |
3033 workers()->run_task(&task); | |
3034 set_par_threads(0); | |
1020
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|
3035 if (task.failures()) { |
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|
3036 failures = true; |
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|
3037 } |
390 | 3038 |
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|
3039 // Checks that the expected amount of parallel work was done. |
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|
3040 // The implication is that n_workers is > 0. |
390 | 3041 assert(check_heap_region_claim_values(HeapRegion::ParVerifyClaimValue), |
3042 "sanity check"); | |
3043 | |
3044 reset_heap_region_claim_values(); | |
3045 | |
3046 assert(check_heap_region_claim_values(HeapRegion::InitialClaimValue), | |
3047 "sanity check"); | |
3048 } else { | |
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|
3049 VerifyRegionClosure blk(allow_dirty, false, vo); |
3766 | 3050 heap_region_iterate(&blk); |
1020
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|
3051 if (blk.failures()) { |
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|
3052 failures = true; |
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|
3053 } |
390 | 3054 } |
2152 | 3055 if (!silent) gclog_or_tty->print("RemSet "); |
342 | 3056 rem_set()->verify(); |
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|
3057 |
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|
3058 if (failures) { |
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|
3059 gclog_or_tty->print_cr("Heap:"); |
4073
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|
3060 // It helps to have the per-region information in the output to |
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|
3061 // help us track down what went wrong. This is why we call |
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3062 // print_extended_on() instead of print_on(). |
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3063 print_extended_on(gclog_or_tty); |
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3064 gclog_or_tty->print_cr(""); |
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3065 #ifndef PRODUCT |
1044 | 3066 if (VerifyDuringGC && G1VerifyDuringGCPrintReachable) { |
1388 | 3067 concurrent_mark()->print_reachable("at-verification-failure", |
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3068 vo, false /* all */); |
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3069 } |
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3070 #endif |
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3071 gclog_or_tty->flush(); |
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3072 } |
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3073 guarantee(!failures, "there should not have been any failures"); |
342 | 3074 } else { |
3075 if (!silent) gclog_or_tty->print("(SKIPPING roots, heapRegions, remset) "); | |
3076 } | |
3077 } | |
3078 | |
3079 class PrintRegionClosure: public HeapRegionClosure { | |
3080 outputStream* _st; | |
3081 public: | |
3082 PrintRegionClosure(outputStream* st) : _st(st) {} | |
3083 bool doHeapRegion(HeapRegion* r) { | |
3084 r->print_on(_st); | |
3085 return false; | |
3086 } | |
3087 }; | |
3088 | |
3089 void G1CollectedHeap::print_on(outputStream* st) const { | |
838
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3090 st->print(" %-20s", "garbage-first heap"); |
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3091 st->print(" total " SIZE_FORMAT "K, used " SIZE_FORMAT "K", |
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3092 capacity()/K, used_unlocked()/K); |
838
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3093 st->print(" [" INTPTR_FORMAT ", " INTPTR_FORMAT ", " INTPTR_FORMAT ")", |
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3094 _g1_storage.low_boundary(), |
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3095 _g1_storage.high(), |
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3096 _g1_storage.high_boundary()); |
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3097 st->cr(); |
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3098 st->print(" region size " SIZE_FORMAT "K, ", HeapRegion::GrainBytes / K); |
838
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3099 size_t young_regions = _young_list->length(); |
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3100 st->print(SIZE_FORMAT " young (" SIZE_FORMAT "K), ", |
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3101 young_regions, young_regions * HeapRegion::GrainBytes / K); |
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3102 size_t survivor_regions = g1_policy()->recorded_survivor_regions(); |
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3103 st->print(SIZE_FORMAT " survivors (" SIZE_FORMAT "K)", |
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3104 survivor_regions, survivor_regions * HeapRegion::GrainBytes / K); |
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3105 st->cr(); |
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3106 perm()->as_gen()->print_on(st); |
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3107 } |
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3108 |
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3109 void G1CollectedHeap::print_extended_on(outputStream* st) const { |
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3110 print_on(st); |
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3111 |
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3112 // Print the per-region information. |
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3113 st->cr(); |
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3114 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 | 3115 PrintRegionClosure blk(st); |
3766 | 3116 heap_region_iterate(&blk); |
342 | 3117 } |
3118 | |
3119 void G1CollectedHeap::print_gc_threads_on(outputStream* st) const { | |
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3120 if (G1CollectedHeap::use_parallel_gc_threads()) { |
1019 | 3121 workers()->print_worker_threads_on(st); |
3122 } | |
3123 _cmThread->print_on(st); | |
342 | 3124 st->cr(); |
1019 | 3125 _cm->print_worker_threads_on(st); |
3126 _cg1r->print_worker_threads_on(st); | |
342 | 3127 st->cr(); |
3128 } | |
3129 | |
3130 void G1CollectedHeap::gc_threads_do(ThreadClosure* tc) const { | |
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3131 if (G1CollectedHeap::use_parallel_gc_threads()) { |
342 | 3132 workers()->threads_do(tc); |
3133 } | |
3134 tc->do_thread(_cmThread); | |
794 | 3135 _cg1r->threads_do(tc); |
342 | 3136 } |
3137 | |
3138 void G1CollectedHeap::print_tracing_info() const { | |
3139 // We'll overload this to mean "trace GC pause statistics." | |
3140 if (TraceGen0Time || TraceGen1Time) { | |
3141 // The "G1CollectorPolicy" is keeping track of these stats, so delegate | |
3142 // to that. | |
3143 g1_policy()->print_tracing_info(); | |
3144 } | |
751 | 3145 if (G1SummarizeRSetStats) { |
342 | 3146 g1_rem_set()->print_summary_info(); |
3147 } | |
1282 | 3148 if (G1SummarizeConcMark) { |
342 | 3149 concurrent_mark()->print_summary_info(); |
3150 } | |
3151 g1_policy()->print_yg_surv_rate_info(); | |
3152 SpecializationStats::print(); | |
3153 } | |
3154 | |
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3155 #ifndef PRODUCT |
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3156 // Helpful for debugging RSet issues. |
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3157 |
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3158 class PrintRSetsClosure : public HeapRegionClosure { |
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3159 private: |
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3160 const char* _msg; |
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3161 size_t _occupied_sum; |
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3162 |
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3163 public: |
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3164 bool doHeapRegion(HeapRegion* r) { |
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3165 HeapRegionRemSet* hrrs = r->rem_set(); |
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3166 size_t occupied = hrrs->occupied(); |
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3167 _occupied_sum += occupied; |
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3168 |
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3169 gclog_or_tty->print_cr("Printing RSet for region "HR_FORMAT, |
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3170 HR_FORMAT_PARAMS(r)); |
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3171 if (occupied == 0) { |
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3172 gclog_or_tty->print_cr(" RSet is empty"); |
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3173 } else { |
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|
3174 hrrs->print(); |
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|
3175 } |
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|
3176 gclog_or_tty->print_cr("----------"); |
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|
3177 return false; |
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|
3178 } |
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|
3179 |
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3180 PrintRSetsClosure(const char* msg) : _msg(msg), _occupied_sum(0) { |
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|
3181 gclog_or_tty->cr(); |
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3182 gclog_or_tty->print_cr("========================================"); |
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3183 gclog_or_tty->print_cr(msg); |
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|
3184 gclog_or_tty->cr(); |
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|
3185 } |
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|
3186 |
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3187 ~PrintRSetsClosure() { |
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3188 gclog_or_tty->print_cr("Occupied Sum: "SIZE_FORMAT, _occupied_sum); |
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3189 gclog_or_tty->print_cr("========================================"); |
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|
3190 gclog_or_tty->cr(); |
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|
3191 } |
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|
3192 }; |
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|
3193 |
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3194 void G1CollectedHeap::print_cset_rsets() { |
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3195 PrintRSetsClosure cl("Printing CSet RSets"); |
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|
3196 collection_set_iterate(&cl); |
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|
3197 } |
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|
3198 |
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3199 void G1CollectedHeap::print_all_rsets() { |
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3200 PrintRSetsClosure cl("Printing All RSets");; |
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|
3201 heap_region_iterate(&cl); |
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|
3202 } |
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3203 #endif // PRODUCT |
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3204 |
342 | 3205 G1CollectedHeap* G1CollectedHeap::heap() { |
3206 assert(_sh->kind() == CollectedHeap::G1CollectedHeap, | |
3207 "not a garbage-first heap"); | |
3208 return _g1h; | |
3209 } | |
3210 | |
3211 void G1CollectedHeap::gc_prologue(bool full /* Ignored */) { | |
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3212 // always_do_update_barrier = false; |
342 | 3213 assert(InlineCacheBuffer::is_empty(), "should have cleaned up ICBuffer"); |
3214 // Call allocation profiler | |
3215 AllocationProfiler::iterate_since_last_gc(); | |
3216 // Fill TLAB's and such | |
3217 ensure_parsability(true); | |
3218 } | |
3219 | |
3220 void G1CollectedHeap::gc_epilogue(bool full /* Ignored */) { | |
3221 // FIXME: what is this about? | |
3222 // I'm ignoring the "fill_newgen()" call if "alloc_event_enabled" | |
3223 // is set. | |
3224 COMPILER2_PRESENT(assert(DerivedPointerTable::is_empty(), | |
3225 "derived pointer present")); | |
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3226 // always_do_update_barrier = true; |
3979
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|
3227 |
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|
3228 // We have just completed a GC. Update the soft reference |
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|
3229 // policy with the new heap occupancy |
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3230 Universe::update_heap_info_at_gc(); |
342 | 3231 } |
3232 | |
1973 | 3233 HeapWord* G1CollectedHeap::do_collection_pause(size_t word_size, |
3234 unsigned int gc_count_before, | |
3235 bool* succeeded) { | |
3236 assert_heap_not_locked_and_not_at_safepoint(); | |
342 | 3237 g1_policy()->record_stop_world_start(); |
1973 | 3238 VM_G1IncCollectionPause op(gc_count_before, |
3239 word_size, | |
3240 false, /* should_initiate_conc_mark */ | |
3241 g1_policy()->max_pause_time_ms(), | |
3242 GCCause::_g1_inc_collection_pause); | |
3243 VMThread::execute(&op); | |
3244 | |
3245 HeapWord* result = op.result(); | |
3246 bool ret_succeeded = op.prologue_succeeded() && op.pause_succeeded(); | |
3247 assert(result == NULL || ret_succeeded, | |
3248 "the result should be NULL if the VM did not succeed"); | |
3249 *succeeded = ret_succeeded; | |
3250 | |
3251 assert_heap_not_locked(); | |
3252 return result; | |
342 | 3253 } |
3254 | |
3255 void | |
3256 G1CollectedHeap::doConcurrentMark() { | |
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3257 MutexLockerEx x(CGC_lock, Mutex::_no_safepoint_check_flag); |
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3258 if (!_cmThread->in_progress()) { |
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|
3259 _cmThread->set_started(); |
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3260 CGC_lock->notify(); |
342 | 3261 } |
3262 } | |
3263 | |
3264 double G1CollectedHeap::predict_region_elapsed_time_ms(HeapRegion *hr, | |
3265 bool young) { | |
3266 return _g1_policy->predict_region_elapsed_time_ms(hr, young); | |
3267 } | |
3268 | |
3269 void G1CollectedHeap::check_if_region_is_too_expensive(double | |
3270 predicted_time_ms) { | |
3271 _g1_policy->check_if_region_is_too_expensive(predicted_time_ms); | |
3272 } | |
3273 | |
3274 size_t G1CollectedHeap::pending_card_num() { | |
3275 size_t extra_cards = 0; | |
3276 JavaThread *curr = Threads::first(); | |
3277 while (curr != NULL) { | |
3278 DirtyCardQueue& dcq = curr->dirty_card_queue(); | |
3279 extra_cards += dcq.size(); | |
3280 curr = curr->next(); | |
3281 } | |
3282 DirtyCardQueueSet& dcqs = JavaThread::dirty_card_queue_set(); | |
3283 size_t buffer_size = dcqs.buffer_size(); | |
3284 size_t buffer_num = dcqs.completed_buffers_num(); | |
3285 return buffer_size * buffer_num + extra_cards; | |
3286 } | |
3287 | |
3288 size_t G1CollectedHeap::max_pending_card_num() { | |
3289 DirtyCardQueueSet& dcqs = JavaThread::dirty_card_queue_set(); | |
3290 size_t buffer_size = dcqs.buffer_size(); | |
3291 size_t buffer_num = dcqs.completed_buffers_num(); | |
3292 int thread_num = Threads::number_of_threads(); | |
3293 return (buffer_num + thread_num) * buffer_size; | |
3294 } | |
3295 | |
3296 size_t G1CollectedHeap::cards_scanned() { | |
1861 | 3297 return g1_rem_set()->cardsScanned(); |
342 | 3298 } |
3299 | |
3300 void | |
3301 G1CollectedHeap::setup_surviving_young_words() { | |
3302 guarantee( _surviving_young_words == NULL, "pre-condition" ); | |
4090
a88de71c4e3a
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|
3303 size_t array_length = g1_policy()->young_cset_region_length(); |
342 | 3304 _surviving_young_words = NEW_C_HEAP_ARRAY(size_t, array_length); |
3305 if (_surviving_young_words == NULL) { | |
3306 vm_exit_out_of_memory(sizeof(size_t) * array_length, | |
3307 "Not enough space for young surv words summary."); | |
3308 } | |
3309 memset(_surviving_young_words, 0, array_length * sizeof(size_t)); | |
845
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
ysr
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diff
changeset
|
3310 #ifdef ASSERT |
342 | 3311 for (size_t i = 0; i < array_length; ++i) { |
845
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6700789: G1: Enable use of compressed oops with G1 heaps
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|
3312 assert( _surviving_young_words[i] == 0, "memset above" ); |
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
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|
3313 } |
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|
3314 #endif // !ASSERT |
342 | 3315 } |
3316 | |
3317 void | |
3318 G1CollectedHeap::update_surviving_young_words(size_t* surv_young_words) { | |
3319 MutexLockerEx x(ParGCRareEvent_lock, Mutex::_no_safepoint_check_flag); | |
4090
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|
3320 size_t array_length = g1_policy()->young_cset_region_length(); |
342 | 3321 for (size_t i = 0; i < array_length; ++i) |
3322 _surviving_young_words[i] += surv_young_words[i]; | |
3323 } | |
3324 | |
3325 void | |
3326 G1CollectedHeap::cleanup_surviving_young_words() { | |
3327 guarantee( _surviving_young_words != NULL, "pre-condition" ); | |
3328 FREE_C_HEAP_ARRAY(size_t, _surviving_young_words); | |
3329 _surviving_young_words = NULL; | |
3330 } | |
3331 | |
3777
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7046182: G1: remove unnecessary iterations over the collection set
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|
3332 #ifdef ASSERT |
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|
3333 class VerifyCSetClosure: public HeapRegionClosure { |
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7046182: G1: remove unnecessary iterations over the collection set
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changeset
|
3334 public: |
e8b0b0392037
7046182: G1: remove unnecessary iterations over the collection set
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diff
changeset
|
3335 bool doHeapRegion(HeapRegion* hr) { |
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7046182: G1: remove unnecessary iterations over the collection set
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changeset
|
3336 // Here we check that the CSet region's RSet is ready for parallel |
e8b0b0392037
7046182: G1: remove unnecessary iterations over the collection set
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diff
changeset
|
3337 // iteration. The fields that we'll verify are only manipulated |
e8b0b0392037
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diff
changeset
|
3338 // when the region is part of a CSet and is collected. Afterwards, |
e8b0b0392037
7046182: G1: remove unnecessary iterations over the collection set
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changeset
|
3339 // we reset these fields when we clear the region's RSet (when the |
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7046182: G1: remove unnecessary iterations over the collection set
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diff
changeset
|
3340 // region is freed) so they are ready when the region is |
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diff
changeset
|
3341 // re-allocated. The only exception to this is if there's an |
e8b0b0392037
7046182: G1: remove unnecessary iterations over the collection set
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diff
changeset
|
3342 // evacuation failure and instead of freeing the region we leave |
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7046182: G1: remove unnecessary iterations over the collection set
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changeset
|
3343 // it in the heap. In that case, we reset these fields during |
e8b0b0392037
7046182: G1: remove unnecessary iterations over the collection set
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changeset
|
3344 // evacuation failure handling. |
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7046182: G1: remove unnecessary iterations over the collection set
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changeset
|
3345 guarantee(hr->rem_set()->verify_ready_for_par_iteration(), "verification"); |
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7046182: G1: remove unnecessary iterations over the collection set
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changeset
|
3346 |
e8b0b0392037
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diff
changeset
|
3347 // Here's a good place to add any other checks we'd like to |
e8b0b0392037
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parents:
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diff
changeset
|
3348 // perform on CSet regions. |
1261
0414c1049f15
6923991: G1: improve scalability of RSet scanning
iveresov
parents:
1245
diff
changeset
|
3349 return false; |
0414c1049f15
6923991: G1: improve scalability of RSet scanning
iveresov
parents:
1245
diff
changeset
|
3350 } |
0414c1049f15
6923991: G1: improve scalability of RSet scanning
iveresov
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diff
changeset
|
3351 }; |
3777
e8b0b0392037
7046182: G1: remove unnecessary iterations over the collection set
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3774
diff
changeset
|
3352 #endif // ASSERT |
1261
0414c1049f15
6923991: G1: improve scalability of RSet scanning
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parents:
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diff
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|
3353 |
1709 | 3354 #if TASKQUEUE_STATS |
3355 void G1CollectedHeap::print_taskqueue_stats_hdr(outputStream* const st) { | |
3356 st->print_raw_cr("GC Task Stats"); | |
3357 st->print_raw("thr "); TaskQueueStats::print_header(1, st); st->cr(); | |
3358 st->print_raw("--- "); TaskQueueStats::print_header(2, st); st->cr(); | |
3359 } | |
3360 | |
3361 void G1CollectedHeap::print_taskqueue_stats(outputStream* const st) const { | |
3362 print_taskqueue_stats_hdr(st); | |
3363 | |
3364 TaskQueueStats totals; | |
1755
8e5955ddf8e4
6978300: G1: debug builds crash if ParallelGCThreads==0
jcoomes
parents:
1719
diff
changeset
|
3365 const int n = workers() != NULL ? workers()->total_workers() : 1; |
1709 | 3366 for (int i = 0; i < n; ++i) { |
3367 st->print("%3d ", i); task_queue(i)->stats.print(st); st->cr(); | |
3368 totals += task_queue(i)->stats; | |
3369 } | |
3370 st->print_raw("tot "); totals.print(st); st->cr(); | |
3371 | |
3372 DEBUG_ONLY(totals.verify()); | |
3373 } | |
3374 | |
3375 void G1CollectedHeap::reset_taskqueue_stats() { | |
1755
8e5955ddf8e4
6978300: G1: debug builds crash if ParallelGCThreads==0
jcoomes
parents:
1719
diff
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|
3376 const int n = workers() != NULL ? workers()->total_workers() : 1; |
1709 | 3377 for (int i = 0; i < n; ++i) { |
3378 task_queue(i)->stats.reset(); | |
3379 } | |
3380 } | |
3381 #endif // TASKQUEUE_STATS | |
3382 | |
1973 | 3383 bool |
1656
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6944166: G1: explicit GCs are not always handled correctly
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diff
changeset
|
3384 G1CollectedHeap::do_collection_pause_at_safepoint(double target_pause_time_ms) { |
2152 | 3385 assert_at_safepoint(true /* should_be_vm_thread */); |
3386 guarantee(!is_gc_active(), "collection is not reentrant"); | |
3387 | |
1359
23b1b27ac76c
6909756: G1: guarantee(G1CollectedHeap::heap()->mark_in_progress(),"Precondition.")
tonyp
parents:
1313
diff
changeset
|
3388 if (GC_locker::check_active_before_gc()) { |
1973 | 3389 return false; |
1359
23b1b27ac76c
6909756: G1: guarantee(G1CollectedHeap::heap()->mark_in_progress(),"Precondition.")
tonyp
parents:
1313
diff
changeset
|
3390 } |
23b1b27ac76c
6909756: G1: guarantee(G1CollectedHeap::heap()->mark_in_progress(),"Precondition.")
tonyp
parents:
1313
diff
changeset
|
3391 |
2125
7246a374a9f2
6458402: 3 jvmti tests fail with CMS and +ExplicitGCInvokesConcurrent
kamg
parents:
2039
diff
changeset
|
3392 SvcGCMarker sgcm(SvcGCMarker::MINOR); |
2039
7c5250dbd584
6896624: G1: hotspot:::gc and hotspot:::mem-pool-gc probes are not fired
tonyp
parents:
2038
diff
changeset
|
3393 ResourceMark rm; |
7c5250dbd584
6896624: G1: hotspot:::gc and hotspot:::mem-pool-gc probes are not fired
tonyp
parents:
2038
diff
changeset
|
3394 |
838
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
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811
diff
changeset
|
3395 if (PrintHeapAtGC) { |
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
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diff
changeset
|
3396 Universe::print_heap_before_gc(); |
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
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diff
changeset
|
3397 } |
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
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diff
changeset
|
3398 |
4072 | 3399 HRSPhaseSetter x(HRSPhaseEvacuation); |
2152 | 3400 verify_region_sets_optional(); |
2433
abdfc822206f
7023069: G1: Introduce symmetric locking in the slow allocation path
tonyp
parents:
2432
diff
changeset
|
3401 verify_dirty_young_regions(); |
2152 | 3402 |
838
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
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811
diff
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|
3403 { |
1359
23b1b27ac76c
6909756: G1: guarantee(G1CollectedHeap::heap()->mark_in_progress(),"Precondition.")
tonyp
parents:
1313
diff
changeset
|
3404 // This call will decide whether this pause is an initial-mark |
23b1b27ac76c
6909756: G1: guarantee(G1CollectedHeap::heap()->mark_in_progress(),"Precondition.")
tonyp
parents:
1313
diff
changeset
|
3405 // pause. If it is, during_initial_mark_pause() will return true |
23b1b27ac76c
6909756: G1: guarantee(G1CollectedHeap::heap()->mark_in_progress(),"Precondition.")
tonyp
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1313
diff
changeset
|
3406 // for the duration of this pause. |
23b1b27ac76c
6909756: G1: guarantee(G1CollectedHeap::heap()->mark_in_progress(),"Precondition.")
tonyp
parents:
1313
diff
changeset
|
3407 g1_policy()->decide_on_conc_mark_initiation(); |
23b1b27ac76c
6909756: G1: guarantee(G1CollectedHeap::heap()->mark_in_progress(),"Precondition.")
tonyp
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1313
diff
changeset
|
3408 |
3982
273b46400613
7086533: G1: assert(!_g1->is_obj_dead(obj)): We should not be preserving dead objs: g1CollectedHeap.cpp:3835
johnc
parents:
3980
diff
changeset
|
3409 // We do not allow initial-mark to be piggy-backed on a |
273b46400613
7086533: G1: assert(!_g1->is_obj_dead(obj)): We should not be preserving dead objs: g1CollectedHeap.cpp:3835
johnc
parents:
3980
diff
changeset
|
3410 // partially-young GC. |
273b46400613
7086533: G1: assert(!_g1->is_obj_dead(obj)): We should not be preserving dead objs: g1CollectedHeap.cpp:3835
johnc
parents:
3980
diff
changeset
|
3411 assert(!g1_policy()->during_initial_mark_pause() || |
273b46400613
7086533: G1: assert(!_g1->is_obj_dead(obj)): We should not be preserving dead objs: g1CollectedHeap.cpp:3835
johnc
parents:
3980
diff
changeset
|
3412 g1_policy()->full_young_gcs(), "sanity"); |
273b46400613
7086533: G1: assert(!_g1->is_obj_dead(obj)): We should not be preserving dead objs: g1CollectedHeap.cpp:3835
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parents:
3980
diff
changeset
|
3413 |
273b46400613
7086533: G1: assert(!_g1->is_obj_dead(obj)): We should not be preserving dead objs: g1CollectedHeap.cpp:3835
johnc
parents:
3980
diff
changeset
|
3414 // We also do not allow partially-young GCs during marking. |
273b46400613
7086533: G1: assert(!_g1->is_obj_dead(obj)): We should not be preserving dead objs: g1CollectedHeap.cpp:3835
johnc
parents:
3980
diff
changeset
|
3415 assert(!mark_in_progress() || g1_policy()->full_young_gcs(), "sanity"); |
273b46400613
7086533: G1: assert(!_g1->is_obj_dead(obj)): We should not be preserving dead objs: g1CollectedHeap.cpp:3835
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parents:
3980
diff
changeset
|
3416 |
838
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
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811
diff
changeset
|
3417 char verbose_str[128]; |
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
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811
diff
changeset
|
3418 sprintf(verbose_str, "GC pause "); |
3867
ff53346271fe
6814390: G1: remove the concept of non-generational G1
brutisso
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3830
diff
changeset
|
3419 if (g1_policy()->full_young_gcs()) { |
ff53346271fe
6814390: G1: remove the concept of non-generational G1
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3830
diff
changeset
|
3420 strcat(verbose_str, "(young)"); |
ff53346271fe
6814390: G1: remove the concept of non-generational G1
brutisso
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3830
diff
changeset
|
3421 } else { |
ff53346271fe
6814390: G1: remove the concept of non-generational G1
brutisso
parents:
3830
diff
changeset
|
3422 strcat(verbose_str, "(partial)"); |
838
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
parents:
811
diff
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|
3423 } |
1656
4e5661ba9d98
6944166: G1: explicit GCs are not always handled correctly
tonyp
parents:
1611
diff
changeset
|
3424 if (g1_policy()->during_initial_mark_pause()) { |
838
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
parents:
811
diff
changeset
|
3425 strcat(verbose_str, " (initial-mark)"); |
1656
4e5661ba9d98
6944166: G1: explicit GCs are not always handled correctly
tonyp
parents:
1611
diff
changeset
|
3426 // 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
|
3427 // full collection counter. |
4e5661ba9d98
6944166: G1: explicit GCs are not always handled correctly
tonyp
parents:
1611
diff
changeset
|
3428 increment_total_full_collections(); |
4e5661ba9d98
6944166: G1: explicit GCs are not always handled correctly
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1611
diff
changeset
|
3429 } |
838
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
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811
diff
changeset
|
3430 |
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
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811
diff
changeset
|
3431 // 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
|
3432 // 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
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811
diff
changeset
|
3433 // is messy if we do. |
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
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parents:
811
diff
changeset
|
3434 gclog_or_tty->date_stamp(PrintGC && PrintGCDateStamps); |
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
parents:
811
diff
changeset
|
3435 TraceCPUTime tcpu(PrintGCDetails, true, gclog_or_tty); |
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
parents:
811
diff
changeset
|
3436 TraceTime t(verbose_str, PrintGC && !PrintGCDetails, true, gclog_or_tty); |
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
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diff
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|
3437 |
3289
b52782ae3880
6946417: G1: Java VisualVM does not support G1 properly.
jmasa
parents:
3285
diff
changeset
|
3438 TraceCollectorStats tcs(g1mm()->incremental_collection_counters()); |
3356
78542e2b5e35
7036199: Adding a notification to the implementation of GarbageCollectorMXBeans
fparain
parents:
3323
diff
changeset
|
3439 TraceMemoryManagerStats tms(false /* fullGC */, gc_cause()); |
1089
db0d5eba9d20
6815790: G1: Missing MemoryPoolMXBeans with -XX:+UseG1GC
tonyp
parents:
1088
diff
changeset
|
3440 |
2361 | 3441 // If the secondary_free_list is not empty, append it to the |
3442 // free_list. No need to wait for the cleanup operation to finish; | |
3443 // the region allocation code will check the secondary_free_list | |
3444 // and wait if necessary. If the G1StressConcRegionFreeing flag is | |
3445 // set, skip this step so that the region allocation code has to | |
3446 // get entries from the secondary_free_list. | |
2152 | 3447 if (!G1StressConcRegionFreeing) { |
2361 | 3448 append_secondary_free_list_if_not_empty_with_lock(); |
2152 | 3449 } |
838
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
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parents:
811
diff
changeset
|
3450 |
3867
ff53346271fe
6814390: G1: remove the concept of non-generational G1
brutisso
parents:
3830
diff
changeset
|
3451 assert(check_young_list_well_formed(), |
ff53346271fe
6814390: G1: remove the concept of non-generational G1
brutisso
parents:
3830
diff
changeset
|
3452 "young list should be well formed"); |
838
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
parents:
811
diff
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|
3453 |
4095
bca17e38de00
6593758: RFE: Enhance GC ergonomics to dynamically choose ParallelGCThreads
jmasa
parents:
4090
diff
changeset
|
3454 // 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
|
3455 // 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
|
3456 // it will be set. |
bca17e38de00
6593758: RFE: Enhance GC ergonomics to dynamically choose ParallelGCThreads
jmasa
parents:
4090
diff
changeset
|
3457 |
838
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
parents:
811
diff
changeset
|
3458 { // Call to jvmpi::post_class_unload_events must occur outside of active GC |
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
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diff
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|
3459 IsGCActiveMark x; |
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
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811
diff
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|
3460 |
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
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diff
changeset
|
3461 gc_prologue(false); |
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
parents:
811
diff
changeset
|
3462 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
|
3463 increment_gc_time_stamp(); |
342 | 3464 |
838
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
parents:
811
diff
changeset
|
3465 if (VerifyBeforeGC && total_collections() >= VerifyGCStartAt) { |
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
parents:
811
diff
changeset
|
3466 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
|
3467 gclog_or_tty->print(" VerifyBeforeGC:"); |
838
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
parents:
811
diff
changeset
|
3468 prepare_for_verify(); |
3772
6747fd0512e0
7004681: G1: Extend marking verification to Full GCs
johnc
parents:
3766
diff
changeset
|
3469 Universe::verify(/* allow dirty */ false, |
6747fd0512e0
7004681: G1: Extend marking verification to Full GCs
johnc
parents:
3766
diff
changeset
|
3470 /* silent */ false, |
6747fd0512e0
7004681: G1: Extend marking verification to Full GCs
johnc
parents:
3766
diff
changeset
|
3471 /* option */ VerifyOption_G1UsePrevMarking); |
6747fd0512e0
7004681: G1: Extend marking verification to Full GCs
johnc
parents:
3766
diff
changeset
|
3472 |
838
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
parents:
811
diff
changeset
|
3473 } |
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
parents:
811
diff
changeset
|
3474 |
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
parents:
811
diff
changeset
|
3475 COMPILER2_PRESENT(DerivedPointerTable::clear()); |
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
parents:
811
diff
changeset
|
3476 |
3979
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3477 // Please see comment in g1CollectedHeap.hpp and |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3478 // G1CollectedHeap::ref_processing_init() to see how |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3479 // reference processing currently works in G1. |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3480 |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3481 // Enable discovery in the STW reference processor |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3482 ref_processor_stw()->enable_discovery(true /*verify_disabled*/, |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3483 true /*verify_no_refs*/); |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3484 |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3485 { |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3486 // We want to temporarily turn off discovery by the |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3487 // CM ref processor, if necessary, and turn it back on |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3488 // on again later if we do. Using a scoped |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3489 // NoRefDiscovery object will do this. |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3490 NoRefDiscovery no_cm_discovery(ref_processor_cm()); |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3491 |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3492 // 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
|
3493 // of the collection set!). |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3494 release_mutator_alloc_region(); |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3495 |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3496 // We should call this after we retire the mutator alloc |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3497 // region(s) so that all the ALLOC / RETIRE events are generated |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3498 // before the start GC event. |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3499 _hr_printer.start_gc(false /* full */, (size_t) total_collections()); |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3500 |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3501 // The elapsed time induced by the start time below deliberately elides |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3502 // the possible verification above. |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3503 double start_time_sec = os::elapsedTime(); |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3504 size_t start_used_bytes = used(); |
838
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
parents:
811
diff
changeset
|
3505 |
1394
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
3506 #if YOUNG_LIST_VERBOSE |
3979
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3507 gclog_or_tty->print_cr("\nBefore recording pause start.\nYoung_list:"); |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3508 _young_list->print(); |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3509 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
|
3510 #endif // YOUNG_LIST_VERBOSE |
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
3511 |
3979
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3512 g1_policy()->record_collection_pause_start(start_time_sec, |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3513 start_used_bytes); |
838
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
parents:
811
diff
changeset
|
3514 |
1394
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
3515 #if YOUNG_LIST_VERBOSE |
3979
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3516 gclog_or_tty->print_cr("\nAfter recording pause start.\nYoung_list:"); |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3517 _young_list->print(); |
1394
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
3518 #endif // YOUNG_LIST_VERBOSE |
342 | 3519 |
3979
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3520 if (g1_policy()->during_initial_mark_pause()) { |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3521 concurrent_mark()->checkpointRootsInitialPre(); |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3522 } |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3523 perm_gen()->save_marks(); |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3524 |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3525 // We must do this before any possible evacuation that should propagate |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3526 // marks. |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3527 if (mark_in_progress()) { |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3528 double start_time_sec = os::elapsedTime(); |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3529 |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3530 _cm->drainAllSATBBuffers(); |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3531 double finish_mark_ms = (os::elapsedTime() - start_time_sec) * 1000.0; |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3532 g1_policy()->record_satb_drain_time(finish_mark_ms); |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3533 } |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3534 // Record the number of elements currently on the mark stack, so we |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3535 // only iterate over these. (Since evacuation may add to the mark |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3536 // stack, doing more exposes race conditions.) If no mark is in |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3537 // progress, this will be zero. |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3538 _cm->set_oops_do_bound(); |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3539 |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3540 if (mark_in_progress()) { |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3541 concurrent_mark()->newCSet(); |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3542 } |
838
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
parents:
811
diff
changeset
|
3543 |
1394
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
3544 #if YOUNG_LIST_VERBOSE |
3979
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3545 gclog_or_tty->print_cr("\nBefore choosing collection set.\nYoung_list:"); |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3546 _young_list->print(); |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3547 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
|
3548 #endif // YOUNG_LIST_VERBOSE |
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
3549 |
3979
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3550 g1_policy()->choose_collection_set(target_pause_time_ms); |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3551 |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3552 if (_hr_printer.is_active()) { |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3553 HeapRegion* hr = g1_policy()->collection_set(); |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3554 while (hr != NULL) { |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3555 G1HRPrinter::RegionType type; |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3556 if (!hr->is_young()) { |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3557 type = G1HRPrinter::Old; |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3558 } else if (hr->is_survivor()) { |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3559 type = G1HRPrinter::Survivor; |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3560 } else { |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3561 type = G1HRPrinter::Eden; |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3562 } |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3563 _hr_printer.cset(hr); |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3564 hr = hr->next_in_collection_set(); |
3778
5f6f2615433a
7049999: G1: Make the G1PrintHeapRegions output consistent and complete
tonyp
parents:
3777
diff
changeset
|
3565 } |
5f6f2615433a
7049999: G1: Make the G1PrintHeapRegions output consistent and complete
tonyp
parents:
3777
diff
changeset
|
3566 } |
3979
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3567 |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3568 // We have chosen the complete collection set. If marking is |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3569 // active then, we clear the region fields of any of the |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3570 // concurrent marking tasks whose region fields point into |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3571 // the collection set as these values will become stale. This |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3572 // will cause the owning marking threads to claim a new region |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3573 // when marking restarts. |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3574 if (mark_in_progress()) { |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3575 concurrent_mark()->reset_active_task_region_fields_in_cset(); |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3576 } |
3378
69293e516993
7041440: G1: assert(obj->is_oop_or_null(true )) failed: Error #
johnc
parents:
3377
diff
changeset
|
3577 |
3777
e8b0b0392037
7046182: G1: remove unnecessary iterations over the collection set
tonyp
parents:
3774
diff
changeset
|
3578 #ifdef ASSERT |
3979
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3579 VerifyCSetClosure cl; |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3580 collection_set_iterate(&cl); |
3777
e8b0b0392037
7046182: G1: remove unnecessary iterations over the collection set
tonyp
parents:
3774
diff
changeset
|
3581 #endif // ASSERT |
1707 | 3582 |
3979
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3583 setup_surviving_young_words(); |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3584 |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3585 // Initialize the GC alloc regions. |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3586 init_gc_alloc_regions(); |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3587 |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3588 // Actually do the work... |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3589 evacuate_collection_set(); |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3590 |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3591 free_collection_set(g1_policy()->collection_set()); |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3592 g1_policy()->clear_collection_set(); |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3593 |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3594 cleanup_surviving_young_words(); |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3595 |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3596 // Start a new incremental collection set for the next pause. |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3597 g1_policy()->start_incremental_cset_building(); |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3598 |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3599 // Clear the _cset_fast_test bitmap in anticipation of adding |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3600 // regions to the incremental collection set for the next |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3601 // evacuation pause. |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3602 clear_cset_fast_test(); |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3603 |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3604 _young_list->reset_sampled_info(); |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3605 |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3606 // Don't check the whole heap at this point as the |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3607 // GC alloc regions from this pause have been tagged |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3608 // as survivors and moved on to the survivor list. |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3609 // Survivor regions will fail the !is_young() check. |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3610 assert(check_young_list_empty(false /* check_heap */), |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3611 "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
|
3612 |
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
3613 #if YOUNG_LIST_VERBOSE |
3979
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3614 gclog_or_tty->print_cr("Before recording survivors.\nYoung List:"); |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3615 _young_list->print(); |
1394
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
3616 #endif // YOUNG_LIST_VERBOSE |
342 | 3617 |
3979
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3618 g1_policy()->record_survivor_regions(_young_list->survivor_length(), |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3619 _young_list->first_survivor_region(), |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3620 _young_list->last_survivor_region()); |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3621 |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3622 _young_list->reset_auxilary_lists(); |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3623 |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3624 if (evacuation_failed()) { |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3625 _summary_bytes_used = recalculate_used(); |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3626 } else { |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3627 // The "used" of the the collection set have already been subtracted |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3628 // when they were freed. Add in the bytes evacuated. |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3629 _summary_bytes_used += g1_policy()->bytes_copied_during_gc(); |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3630 } |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3631 |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3632 if (g1_policy()->during_initial_mark_pause()) { |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3633 concurrent_mark()->checkpointRootsInitialPost(); |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3634 set_marking_started(); |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3635 // CAUTION: after the doConcurrentMark() call below, |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3636 // the concurrent marking thread(s) could be running |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3637 // concurrently with us. Make sure that anything after |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3638 // this point does not assume that we are the only GC thread |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3639 // running. Note: of course, the actual marking work will |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3640 // not start until the safepoint itself is released in |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3641 // ConcurrentGCThread::safepoint_desynchronize(). |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3642 doConcurrentMark(); |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3643 } |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3644 |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3645 allocate_dummy_regions(); |
3285
49a67202bc67
7011855: G1: non-product flag to artificially grow the heap
tonyp
parents:
2433
diff
changeset
|
3646 |
1394
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
3647 #if YOUNG_LIST_VERBOSE |
3979
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3648 gclog_or_tty->print_cr("\nEnd of the pause.\nYoung_list:"); |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3649 _young_list->print(); |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3650 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
|
3651 #endif // YOUNG_LIST_VERBOSE |
342 | 3652 |
3979
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3653 init_mutator_alloc_region(); |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3654 |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3655 { |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3656 size_t expand_bytes = g1_policy()->expansion_amount(); |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3657 if (expand_bytes > 0) { |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3658 size_t bytes_before = capacity(); |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3659 if (!expand(expand_bytes)) { |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3660 // We failed to expand the heap so let's verify that |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3661 // committed/uncommitted amount match the backing store |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3662 assert(capacity() == _g1_storage.committed_size(), "committed size mismatch"); |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3663 assert(max_capacity() == _g1_storage.reserved_size(), "reserved size mismatch"); |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3664 } |
3920
af2ab04e0038
6929868: G1: introduce min / max young gen size bounds
brutisso
parents:
3919
diff
changeset
|
3665 } |
af2ab04e0038
6929868: G1: introduce min / max young gen size bounds
brutisso
parents:
3919
diff
changeset
|
3666 } |
3979
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3667 |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3668 double end_time_sec = os::elapsedTime(); |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3669 double pause_time_ms = (end_time_sec - start_time_sec) * MILLIUNITS; |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3670 g1_policy()->record_pause_time_ms(pause_time_ms); |
4095
bca17e38de00
6593758: RFE: Enhance GC ergonomics to dynamically choose ParallelGCThreads
jmasa
parents:
4090
diff
changeset
|
3671 int active_gc_threads = workers()->active_workers(); |
bca17e38de00
6593758: RFE: Enhance GC ergonomics to dynamically choose ParallelGCThreads
jmasa
parents:
4090
diff
changeset
|
3672 g1_policy()->record_collection_pause_end(active_gc_threads); |
3979
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 MemoryService::track_memory_usage(); |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3675 |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3676 // 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
|
3677 // update buffers to bring the RSets up-to-date if |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3678 // G1HRRSFlushLogBuffersOnVerify has been set. While scanning |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3679 // 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
|
3680 // regions we just allocated to (i.e., the GC alloc |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3681 // regions). However, during the last GC we called |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3682 // set_saved_mark() on all the GC alloc regions, so card |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3683 // scanning might skip the [saved_mark_word()...top()] area of |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3684 // those regions (i.e., the area we allocated objects into |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3685 // during the last GC). But it shouldn't. Given that |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3686 // saved_mark_word() is conditional on whether the GC time stamp |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3687 // 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
|
3688 // 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
|
3689 // regions and saved_mark_word() will simply return top() for |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3690 // 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
|
3691 // than iterating over the regions and fixing them. In fact, the |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3692 // GC time stamp increment here also ensures that |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3693 // saved_mark_word() will return top() between pauses, i.e., |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3694 // during concurrent refinement. So we don't need the |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3695 // is_gc_active() check to decided which top to use when |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3696 // scanning cards (see CR 7039627). |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3697 increment_gc_time_stamp(); |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3698 |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3699 if (VerifyAfterGC && total_collections() >= VerifyGCStartAt) { |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3700 HandleMark hm; // Discard invalid handles created during verification |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3701 gclog_or_tty->print(" VerifyAfterGC:"); |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3702 prepare_for_verify(); |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3703 Universe::verify(/* allow dirty */ true, |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3704 /* silent */ false, |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3705 /* option */ VerifyOption_G1UsePrevMarking); |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3706 } |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3707 |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3708 assert(!ref_processor_stw()->discovery_enabled(), "Postcondition"); |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3709 ref_processor_stw()->verify_no_references_recorded(); |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3710 |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3711 // 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
|
3712 } |
af2ab04e0038
6929868: G1: introduce min / max young gen size bounds
brutisso
parents:
3919
diff
changeset
|
3713 |
838
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
parents:
811
diff
changeset
|
3714 { |
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
parents:
811
diff
changeset
|
3715 size_t expand_bytes = g1_policy()->expansion_amount(); |
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
parents:
811
diff
changeset
|
3716 if (expand_bytes > 0) { |
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
parents:
811
diff
changeset
|
3717 size_t bytes_before = capacity(); |
3914
20213c8a3c40
7050392: G1: Introduce flag to generate a log of the G1 ergonomic decisions
tonyp
parents:
3886
diff
changeset
|
3718 // No need for an ergo verbose message here, |
20213c8a3c40
7050392: G1: Introduce flag to generate a log of the G1 ergonomic decisions
tonyp
parents:
3886
diff
changeset
|
3719 // expansion_amount() does this when it returns a value > 0. |
2188
c33825b68624
6923430: G1: assert(res != 0,"This should have worked.")
johnc
parents:
2173
diff
changeset
|
3720 if (!expand(expand_bytes)) { |
c33825b68624
6923430: G1: assert(res != 0,"This should have worked.")
johnc
parents:
2173
diff
changeset
|
3721 // We failed to expand the heap so let's verify that |
c33825b68624
6923430: G1: assert(res != 0,"This should have worked.")
johnc
parents:
2173
diff
changeset
|
3722 // committed/uncommitted amount match the backing store |
c33825b68624
6923430: G1: assert(res != 0,"This should have worked.")
johnc
parents:
2173
diff
changeset
|
3723 assert(capacity() == _g1_storage.committed_size(), "committed size mismatch"); |
c33825b68624
6923430: G1: assert(res != 0,"This should have worked.")
johnc
parents:
2173
diff
changeset
|
3724 assert(max_capacity() == _g1_storage.reserved_size(), "reserved size mismatch"); |
c33825b68624
6923430: G1: assert(res != 0,"This should have worked.")
johnc
parents:
2173
diff
changeset
|
3725 } |
838
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
parents:
811
diff
changeset
|
3726 } |
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
parents:
811
diff
changeset
|
3727 } |
3778
5f6f2615433a
7049999: G1: Make the G1PrintHeapRegions output consistent and complete
tonyp
parents:
3777
diff
changeset
|
3728 |
5f6f2615433a
7049999: G1: Make the G1PrintHeapRegions output consistent and complete
tonyp
parents:
3777
diff
changeset
|
3729 // 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
|
3730 // 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
|
3731 // 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
|
3732 // RETIRE events are generated before the end GC event. |
5f6f2615433a
7049999: G1: Make the G1PrintHeapRegions output consistent and complete
tonyp
parents:
3777
diff
changeset
|
3733 _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
|
3734 |
3764
053d84a76d3d
7032531: G1: enhance GC logging to include more accurate eden / survivor size transitions
tonyp
parents:
3378
diff
changeset
|
3735 // 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
|
3736 g1_policy()->print_heap_transition(); |
838
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
parents:
811
diff
changeset
|
3737 |
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
parents:
811
diff
changeset
|
3738 if (mark_in_progress()) { |
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
parents:
811
diff
changeset
|
3739 concurrent_mark()->update_g1_committed(); |
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
parents:
811
diff
changeset
|
3740 } |
546
05c6d52fa7a9
6690928: Use spinning in combination with yields for workstealing termination.
jmasa
parents:
545
diff
changeset
|
3741 |
05c6d52fa7a9
6690928: Use spinning in combination with yields for workstealing termination.
jmasa
parents:
545
diff
changeset
|
3742 #ifdef TRACESPINNING |
838
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
parents:
811
diff
changeset
|
3743 ParallelTaskTerminator::print_termination_counts(); |
546
05c6d52fa7a9
6690928: Use spinning in combination with yields for workstealing termination.
jmasa
parents:
545
diff
changeset
|
3744 #endif |
342 | 3745 |
838
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
parents:
811
diff
changeset
|
3746 gc_epilogue(false); |
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
parents:
811
diff
changeset
|
3747 } |
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
parents:
811
diff
changeset
|
3748 |
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
parents:
811
diff
changeset
|
3749 if (ExitAfterGCNum > 0 && total_collections() == ExitAfterGCNum) { |
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
parents:
811
diff
changeset
|
3750 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
|
3751 print_tracing_info(); |
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
parents:
811
diff
changeset
|
3752 vm_exit(-1); |
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
parents:
811
diff
changeset
|
3753 } |
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
parents:
811
diff
changeset
|
3754 } |
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
parents:
811
diff
changeset
|
3755 |
3766 | 3756 _hrs.verify_optional(); |
2152 | 3757 verify_region_sets_optional(); |
3758 | |
1709 | 3759 TASKQUEUE_STATS_ONLY(if (ParallelGCVerbose) print_taskqueue_stats()); |
3760 TASKQUEUE_STATS_ONLY(reset_taskqueue_stats()); | |
3761 | |
838
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
parents:
811
diff
changeset
|
3762 if (PrintHeapAtGC) { |
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
parents:
811
diff
changeset
|
3763 Universe::print_heap_after_gc(); |
342 | 3764 } |
3980
8229bd737950
7075646: G1: fix inconsistencies in the monitoring data
tonyp
parents:
3979
diff
changeset
|
3765 g1mm()->update_sizes(); |
3289
b52782ae3880
6946417: G1: Java VisualVM does not support G1 properly.
jmasa
parents:
3285
diff
changeset
|
3766 |
884
83b687ce3090
6866591: G1: print update buffer processing stats more often
tonyp
parents:
883
diff
changeset
|
3767 if (G1SummarizeRSetStats && |
83b687ce3090
6866591: G1: print update buffer processing stats more often
tonyp
parents:
883
diff
changeset
|
3768 (G1SummarizeRSetStatsPeriod > 0) && |
83b687ce3090
6866591: G1: print update buffer processing stats more often
tonyp
parents:
883
diff
changeset
|
3769 (total_collections() % G1SummarizeRSetStatsPeriod == 0)) { |
83b687ce3090
6866591: G1: print update buffer processing stats more often
tonyp
parents:
883
diff
changeset
|
3770 g1_rem_set()->print_summary_info(); |
83b687ce3090
6866591: G1: print update buffer processing stats more often
tonyp
parents:
883
diff
changeset
|
3771 } |
1973 | 3772 |
3773 return true; | |
342 | 3774 } |
3775 | |
1391
79e419e5ea3b
6942253: G1: replace G1ParallelGCAllocBufferSize with YoungPLABSize and OldPLABSize
apetrusenko
parents:
1390
diff
changeset
|
3776 size_t G1CollectedHeap::desired_plab_sz(GCAllocPurpose purpose) |
79e419e5ea3b
6942253: G1: replace G1ParallelGCAllocBufferSize with YoungPLABSize and OldPLABSize
apetrusenko
parents:
1390
diff
changeset
|
3777 { |
79e419e5ea3b
6942253: G1: replace G1ParallelGCAllocBufferSize with YoungPLABSize and OldPLABSize
apetrusenko
parents:
1390
diff
changeset
|
3778 size_t gclab_word_size; |
79e419e5ea3b
6942253: G1: replace G1ParallelGCAllocBufferSize with YoungPLABSize and OldPLABSize
apetrusenko
parents:
1390
diff
changeset
|
3779 switch (purpose) { |
79e419e5ea3b
6942253: G1: replace G1ParallelGCAllocBufferSize with YoungPLABSize and OldPLABSize
apetrusenko
parents:
1390
diff
changeset
|
3780 case GCAllocForSurvived: |
79e419e5ea3b
6942253: G1: replace G1ParallelGCAllocBufferSize with YoungPLABSize and OldPLABSize
apetrusenko
parents:
1390
diff
changeset
|
3781 gclab_word_size = YoungPLABSize; |
79e419e5ea3b
6942253: G1: replace G1ParallelGCAllocBufferSize with YoungPLABSize and OldPLABSize
apetrusenko
parents:
1390
diff
changeset
|
3782 break; |
79e419e5ea3b
6942253: G1: replace G1ParallelGCAllocBufferSize with YoungPLABSize and OldPLABSize
apetrusenko
parents:
1390
diff
changeset
|
3783 case GCAllocForTenured: |
79e419e5ea3b
6942253: G1: replace G1ParallelGCAllocBufferSize with YoungPLABSize and OldPLABSize
apetrusenko
parents:
1390
diff
changeset
|
3784 gclab_word_size = OldPLABSize; |
79e419e5ea3b
6942253: G1: replace G1ParallelGCAllocBufferSize with YoungPLABSize and OldPLABSize
apetrusenko
parents:
1390
diff
changeset
|
3785 break; |
79e419e5ea3b
6942253: G1: replace G1ParallelGCAllocBufferSize with YoungPLABSize and OldPLABSize
apetrusenko
parents:
1390
diff
changeset
|
3786 default: |
79e419e5ea3b
6942253: G1: replace G1ParallelGCAllocBufferSize with YoungPLABSize and OldPLABSize
apetrusenko
parents:
1390
diff
changeset
|
3787 assert(false, "unknown GCAllocPurpose"); |
79e419e5ea3b
6942253: G1: replace G1ParallelGCAllocBufferSize with YoungPLABSize and OldPLABSize
apetrusenko
parents:
1390
diff
changeset
|
3788 gclab_word_size = OldPLABSize; |
79e419e5ea3b
6942253: G1: replace G1ParallelGCAllocBufferSize with YoungPLABSize and OldPLABSize
apetrusenko
parents:
1390
diff
changeset
|
3789 break; |
79e419e5ea3b
6942253: G1: replace G1ParallelGCAllocBufferSize with YoungPLABSize and OldPLABSize
apetrusenko
parents:
1390
diff
changeset
|
3790 } |
79e419e5ea3b
6942253: G1: replace G1ParallelGCAllocBufferSize with YoungPLABSize and OldPLABSize
apetrusenko
parents:
1390
diff
changeset
|
3791 return gclab_word_size; |
79e419e5ea3b
6942253: G1: replace G1ParallelGCAllocBufferSize with YoungPLABSize and OldPLABSize
apetrusenko
parents:
1390
diff
changeset
|
3792 } |
79e419e5ea3b
6942253: G1: replace G1ParallelGCAllocBufferSize with YoungPLABSize and OldPLABSize
apetrusenko
parents:
1390
diff
changeset
|
3793 |
2433
abdfc822206f
7023069: G1: Introduce symmetric locking in the slow allocation path
tonyp
parents:
2432
diff
changeset
|
3794 void G1CollectedHeap::init_mutator_alloc_region() { |
abdfc822206f
7023069: G1: Introduce symmetric locking in the slow allocation path
tonyp
parents:
2432
diff
changeset
|
3795 assert(_mutator_alloc_region.get() == NULL, "pre-condition"); |
abdfc822206f
7023069: G1: Introduce symmetric locking in the slow allocation path
tonyp
parents:
2432
diff
changeset
|
3796 _mutator_alloc_region.init(); |
abdfc822206f
7023069: G1: Introduce symmetric locking in the slow allocation path
tonyp
parents:
2432
diff
changeset
|
3797 } |
abdfc822206f
7023069: G1: Introduce symmetric locking in the slow allocation path
tonyp
parents:
2432
diff
changeset
|
3798 |
abdfc822206f
7023069: G1: Introduce symmetric locking in the slow allocation path
tonyp
parents:
2432
diff
changeset
|
3799 void G1CollectedHeap::release_mutator_alloc_region() { |
abdfc822206f
7023069: G1: Introduce symmetric locking in the slow allocation path
tonyp
parents:
2432
diff
changeset
|
3800 _mutator_alloc_region.release(); |
abdfc822206f
7023069: G1: Introduce symmetric locking in the slow allocation path
tonyp
parents:
2432
diff
changeset
|
3801 assert(_mutator_alloc_region.get() == NULL, "post-condition"); |
abdfc822206f
7023069: G1: Introduce symmetric locking in the slow allocation path
tonyp
parents:
2432
diff
changeset
|
3802 } |
1391
79e419e5ea3b
6942253: G1: replace G1ParallelGCAllocBufferSize with YoungPLABSize and OldPLABSize
apetrusenko
parents:
1390
diff
changeset
|
3803 |
3830
f44782f04dd4
7039627: G1: avoid BOT updates for survivor allocations and dirty survivor regions incrementally
tonyp
parents:
3824
diff
changeset
|
3804 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
|
3805 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
|
3806 |
f44782f04dd4
7039627: G1: avoid BOT updates for survivor allocations and dirty survivor regions incrementally
tonyp
parents:
3824
diff
changeset
|
3807 _survivor_gc_alloc_region.init(); |
f44782f04dd4
7039627: G1: avoid BOT updates for survivor allocations and dirty survivor regions incrementally
tonyp
parents:
3824
diff
changeset
|
3808 _old_gc_alloc_region.init(); |
f44782f04dd4
7039627: G1: avoid BOT updates for survivor allocations and dirty survivor regions incrementally
tonyp
parents:
3824
diff
changeset
|
3809 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
|
3810 _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
|
3811 |
f44782f04dd4
7039627: G1: avoid BOT updates for survivor allocations and dirty survivor regions incrementally
tonyp
parents:
3824
diff
changeset
|
3812 // 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
|
3813 // 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
|
3814 // 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
|
3815 // 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
|
3816 // 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
|
3817 // 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
|
3818 // 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
|
3819 // 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
|
3820 // 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
|
3821 if (retained_region != NULL && |
f44782f04dd4
7039627: G1: avoid BOT updates for survivor allocations and dirty survivor regions incrementally
tonyp
parents:
3824
diff
changeset
|
3822 !retained_region->in_collection_set() && |
f44782f04dd4
7039627: G1: avoid BOT updates for survivor allocations and dirty survivor regions incrementally
tonyp
parents:
3824
diff
changeset
|
3823 !(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
|
3824 !retained_region->is_empty() && |
f44782f04dd4
7039627: G1: avoid BOT updates for survivor allocations and dirty survivor regions incrementally
tonyp
parents:
3824
diff
changeset
|
3825 !retained_region->isHumongous()) { |
f44782f04dd4
7039627: G1: avoid BOT updates for survivor allocations and dirty survivor regions incrementally
tonyp
parents:
3824
diff
changeset
|
3826 retained_region->set_saved_mark(); |
4072 | 3827 // The retained region was added to the old region set when it was |
3828 // retired. We have to remove it now, since we don't allow regions | |
3829 // we allocate to in the region sets. We'll re-add it later, when | |
3830 // it's retired again. | |
3831 _old_set.remove(retained_region); | |
3830
f44782f04dd4
7039627: G1: avoid BOT updates for survivor allocations and dirty survivor regions incrementally
tonyp
parents:
3824
diff
changeset
|
3832 _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
|
3833 _hr_printer.reuse(retained_region); |
342 | 3834 } |
3835 } | |
3836 | |
3830
f44782f04dd4
7039627: G1: avoid BOT updates for survivor allocations and dirty survivor regions incrementally
tonyp
parents:
3824
diff
changeset
|
3837 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
|
3838 _survivor_gc_alloc_region.release(); |
f44782f04dd4
7039627: G1: avoid BOT updates for survivor allocations and dirty survivor regions incrementally
tonyp
parents:
3824
diff
changeset
|
3839 // 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
|
3840 // _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
|
3841 // _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
|
3842 // 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
|
3843 // condition. |
f44782f04dd4
7039627: G1: avoid BOT updates for survivor allocations and dirty survivor regions incrementally
tonyp
parents:
3824
diff
changeset
|
3844 _retained_old_gc_alloc_region = _old_gc_alloc_region.release(); |
342 | 3845 } |
3846 | |
3830
f44782f04dd4
7039627: G1: avoid BOT updates for survivor allocations and dirty survivor regions incrementally
tonyp
parents:
3824
diff
changeset
|
3847 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
|
3848 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
|
3849 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
|
3850 _retained_old_gc_alloc_region = NULL; |
342 | 3851 } |
3852 | |
3853 void G1CollectedHeap::init_for_evac_failure(OopsInHeapRegionClosure* cl) { | |
3854 _drain_in_progress = false; | |
3855 set_evac_failure_closure(cl); | |
3856 _evac_failure_scan_stack = new (ResourceObj::C_HEAP) GrowableArray<oop>(40, true); | |
3857 } | |
3858 | |
3859 void G1CollectedHeap::finalize_for_evac_failure() { | |
3860 assert(_evac_failure_scan_stack != NULL && | |
3861 _evac_failure_scan_stack->length() == 0, | |
3862 "Postcondition"); | |
3863 assert(!_drain_in_progress, "Postcondition"); | |
1045 | 3864 delete _evac_failure_scan_stack; |
342 | 3865 _evac_failure_scan_stack = NULL; |
3866 } | |
3867 | |
616
4f360ec815ba
6720309: G1: don't synchronously update RSet during evacuation pauses
iveresov
parents:
595
diff
changeset
|
3868 class UpdateRSetDeferred : public OopsInHeapRegionClosure { |
4f360ec815ba
6720309: G1: don't synchronously update RSet during evacuation pauses
iveresov
parents:
595
diff
changeset
|
3869 private: |
4f360ec815ba
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3870 G1CollectedHeap* _g1; |
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3871 DirtyCardQueue *_dcq; |
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3872 CardTableModRefBS* _ct_bs; |
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3873 |
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3874 public: |
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3875 UpdateRSetDeferred(G1CollectedHeap* g1, DirtyCardQueue* dcq) : |
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3876 _g1(g1), _ct_bs((CardTableModRefBS*)_g1->barrier_set()), _dcq(dcq) {} |
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3877 |
845
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3878 virtual void do_oop(narrowOop* p) { do_oop_work(p); } |
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3879 virtual void do_oop( oop* p) { do_oop_work(p); } |
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3880 template <class T> void do_oop_work(T* p) { |
616
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3881 assert(_from->is_in_reserved(p), "paranoia"); |
845
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3882 if (!_from->is_in_reserved(oopDesc::load_decode_heap_oop(p)) && |
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3883 !_from->is_survivor()) { |
616
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3884 size_t card_index = _ct_bs->index_for(p); |
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3885 if (_ct_bs->mark_card_deferred(card_index)) { |
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3886 _dcq->enqueue((jbyte*)_ct_bs->byte_for_index(card_index)); |
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3887 } |
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3888 } |
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3889 } |
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3890 }; |
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|
3891 |
342 | 3892 class RemoveSelfPointerClosure: public ObjectClosure { |
3893 private: | |
3894 G1CollectedHeap* _g1; | |
3895 ConcurrentMark* _cm; | |
3896 HeapRegion* _hr; | |
3897 size_t _prev_marked_bytes; | |
3898 size_t _next_marked_bytes; | |
616
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3899 OopsInHeapRegionClosure *_cl; |
342 | 3900 public: |
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3901 RemoveSelfPointerClosure(G1CollectedHeap* g1, HeapRegion* hr, |
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3902 OopsInHeapRegionClosure* cl) : |
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3903 _g1(g1), _hr(hr), _cm(_g1->concurrent_mark()), _prev_marked_bytes(0), |
616
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3904 _next_marked_bytes(0), _cl(cl) {} |
342 | 3905 |
3906 size_t prev_marked_bytes() { return _prev_marked_bytes; } | |
3907 size_t next_marked_bytes() { return _next_marked_bytes; } | |
3908 | |
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3909 // <original comment> |
352
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3910 // The original idea here was to coalesce evacuated and dead objects. |
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3911 // However that caused complications with the block offset table (BOT). |
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3912 // In particular if there were two TLABs, one of them partially refined. |
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3913 // |----- TLAB_1--------|----TLAB_2-~~~(partially refined part)~~~| |
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3914 // The BOT entries of the unrefined part of TLAB_2 point to the start |
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3915 // of TLAB_2. If the last object of the TLAB_1 and the first object |
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3916 // of TLAB_2 are coalesced, then the cards of the unrefined part |
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3917 // would point into middle of the filler object. |
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3918 // The current approach is to not coalesce and leave the BOT contents intact. |
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3919 // </original comment> |
352
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3920 // |
2133
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3921 // We now reset the BOT when we start the object iteration over the |
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3922 // region and refine its entries for every object we come across. So |
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3923 // the above comment is not really relevant and we should be able |
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3924 // to coalesce dead objects if we want to. |
352
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3925 void do_object(oop obj) { |
2133
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3926 HeapWord* obj_addr = (HeapWord*) obj; |
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3927 assert(_hr->is_in(obj_addr), "sanity"); |
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3928 size_t obj_size = obj->size(); |
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3929 _hr->update_bot_for_object(obj_addr, obj_size); |
352
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3930 if (obj->is_forwarded() && obj->forwardee() == obj) { |
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3931 // The object failed to move. |
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3932 assert(!_g1->is_obj_dead(obj), "We should not be preserving dead objs."); |
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3933 _cm->markPrev(obj); |
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3934 assert(_cm->isPrevMarked(obj), "Should be marked!"); |
2133
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3935 _prev_marked_bytes += (obj_size * HeapWordSize); |
352
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3936 if (_g1->mark_in_progress() && !_g1->is_obj_ill(obj)) { |
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3937 _cm->markAndGrayObjectIfNecessary(obj); |
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3938 } |
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3939 obj->set_mark(markOopDesc::prototype()); |
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3940 // While we were processing RSet buffers during the |
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3941 // collection, we actually didn't scan any cards on the |
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3942 // collection set, since we didn't want to update remebered |
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3943 // sets with entries that point into the collection set, given |
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3944 // that live objects fromthe collection set are about to move |
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3945 // and such entries will be stale very soon. This change also |
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3946 // dealt with a reliability issue which involved scanning a |
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3947 // card in the collection set and coming across an array that |
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3948 // was being chunked and looking malformed. The problem is |
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3949 // that, if evacuation fails, we might have remembered set |
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3950 // entries missing given that we skipped cards on the |
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3951 // collection set. So, we'll recreate such entries now. |
616
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3952 obj->oop_iterate(_cl); |
352
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3953 assert(_cm->isPrevMarked(obj), "Should be marked!"); |
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3954 } else { |
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3955 // The object has been either evacuated or is dead. Fill it with a |
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3956 // dummy object. |
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3957 MemRegion mr((HeapWord*)obj, obj_size); |
481
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3958 CollectedHeap::fill_with_object(mr); |
342 | 3959 _cm->clearRangeBothMaps(mr); |
3960 } | |
3961 } | |
3962 }; | |
3963 | |
3964 void G1CollectedHeap::remove_self_forwarding_pointers() { | |
1705 | 3965 UpdateRSetImmediate immediate_update(_g1h->g1_rem_set()); |
616
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3966 DirtyCardQueue dcq(&_g1h->dirty_card_queue_set()); |
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3967 UpdateRSetDeferred deferred_update(_g1h, &dcq); |
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3968 OopsInHeapRegionClosure *cl; |
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3969 if (G1DeferredRSUpdate) { |
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3970 cl = &deferred_update; |
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3971 } else { |
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|
3972 cl = &immediate_update; |
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|
3973 } |
342 | 3974 HeapRegion* cur = g1_policy()->collection_set(); |
3975 while (cur != NULL) { | |
3976 assert(g1_policy()->assertMarkedBytesDataOK(), "Should be!"); | |
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3977 assert(!cur->isHumongous(), "sanity"); |
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3978 |
342 | 3979 if (cur->evacuation_failed()) { |
3980 assert(cur->in_collection_set(), "bad CS"); | |
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3981 RemoveSelfPointerClosure rspc(_g1h, cur, cl); |
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3982 |
3777
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3983 // In the common case we make sure that this is done when the |
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3984 // region is freed so that it is "ready-to-go" when it's |
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3985 // re-allocated. However, when evacuation failure happens, a |
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3986 // region will remain in the heap and might ultimately be added |
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3987 // to a CSet in the future. So we have to be careful here and |
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3988 // make sure the region's RSet is ready for parallel iteration |
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|
3989 // whenever this might be required in the future. |
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3990 cur->rem_set()->reset_for_par_iteration(); |
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3991 cur->reset_bot(); |
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3992 cl->set_region(cur); |
342 | 3993 cur->object_iterate(&rspc); |
3994 | |
3995 // A number of manipulations to make the TAMS be the current top, | |
3996 // and the marked bytes be the ones observed in the iteration. | |
3997 if (_g1h->concurrent_mark()->at_least_one_mark_complete()) { | |
3998 // The comments below are the postconditions achieved by the | |
3999 // calls. Note especially the last such condition, which says that | |
4000 // the count of marked bytes has been properly restored. | |
4001 cur->note_start_of_marking(false); | |
4002 // _next_top_at_mark_start == top, _next_marked_bytes == 0 | |
4003 cur->add_to_marked_bytes(rspc.prev_marked_bytes()); | |
4004 // _next_marked_bytes == prev_marked_bytes. | |
4005 cur->note_end_of_marking(); | |
4006 // _prev_top_at_mark_start == top(), | |
4007 // _prev_marked_bytes == prev_marked_bytes | |
4008 } | |
4009 // If there is no mark in progress, we modified the _next variables | |
4010 // above needlessly, but harmlessly. | |
4011 if (_g1h->mark_in_progress()) { | |
4012 cur->note_start_of_marking(false); | |
4013 // _next_top_at_mark_start == top, _next_marked_bytes == 0 | |
4014 // _next_marked_bytes == next_marked_bytes. | |
4015 } | |
4016 } | |
4017 cur = cur->next_in_collection_set(); | |
4018 } | |
4019 assert(g1_policy()->assertMarkedBytesDataOK(), "Should be!"); | |
4020 | |
4021 // Now restore saved marks, if any. | |
4022 if (_objs_with_preserved_marks != NULL) { | |
4023 assert(_preserved_marks_of_objs != NULL, "Both or none."); | |
4024 guarantee(_objs_with_preserved_marks->length() == | |
4025 _preserved_marks_of_objs->length(), "Both or none."); | |
4026 for (int i = 0; i < _objs_with_preserved_marks->length(); i++) { | |
4027 oop obj = _objs_with_preserved_marks->at(i); | |
4028 markOop m = _preserved_marks_of_objs->at(i); | |
4029 obj->set_mark(m); | |
4030 } | |
4031 // Delete the preserved marks growable arrays (allocated on the C heap). | |
4032 delete _objs_with_preserved_marks; | |
4033 delete _preserved_marks_of_objs; | |
4034 _objs_with_preserved_marks = NULL; | |
4035 _preserved_marks_of_objs = NULL; | |
4036 } | |
4037 } | |
4038 | |
4039 void G1CollectedHeap::push_on_evac_failure_scan_stack(oop obj) { | |
4040 _evac_failure_scan_stack->push(obj); | |
4041 } | |
4042 | |
4043 void G1CollectedHeap::drain_evac_failure_scan_stack() { | |
4044 assert(_evac_failure_scan_stack != NULL, "precondition"); | |
4045 | |
4046 while (_evac_failure_scan_stack->length() > 0) { | |
4047 oop obj = _evac_failure_scan_stack->pop(); | |
4048 _evac_failure_closure->set_region(heap_region_containing(obj)); | |
4049 obj->oop_iterate_backwards(_evac_failure_closure); | |
4050 } | |
4051 } | |
4052 | |
4053 oop | |
4054 G1CollectedHeap::handle_evacuation_failure_par(OopsInHeapRegionClosure* cl, | |
3973
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4055 oop old, |
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|
4056 bool should_mark_root) { |
3323
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|
4057 assert(obj_in_cs(old), |
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4058 err_msg("obj: "PTR_FORMAT" should still be in the CSet", |
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4059 (HeapWord*) old)); |
342 | 4060 markOop m = old->mark(); |
4061 oop forward_ptr = old->forward_to_atomic(old); | |
4062 if (forward_ptr == NULL) { | |
4063 // Forward-to-self succeeded. | |
3973
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|
4064 |
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|
4065 // should_mark_root will be true when this routine is called |
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4066 // from a root scanning closure during an initial mark pause. |
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4067 // In this case the thread that succeeds in self-forwarding the |
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4068 // object is also responsible for marking the object. |
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4069 if (should_mark_root) { |
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4070 assert(!oopDesc::is_null(old), "shouldn't be"); |
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4071 _cm->grayRoot(old); |
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|
4072 } |
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|
4073 |
342 | 4074 if (_evac_failure_closure != cl) { |
4075 MutexLockerEx x(EvacFailureStack_lock, Mutex::_no_safepoint_check_flag); | |
4076 assert(!_drain_in_progress, | |
4077 "Should only be true while someone holds the lock."); | |
4078 // Set the global evac-failure closure to the current thread's. | |
4079 assert(_evac_failure_closure == NULL, "Or locking has failed."); | |
4080 set_evac_failure_closure(cl); | |
4081 // Now do the common part. | |
4082 handle_evacuation_failure_common(old, m); | |
4083 // Reset to NULL. | |
4084 set_evac_failure_closure(NULL); | |
4085 } else { | |
4086 // The lock is already held, and this is recursive. | |
4087 assert(_drain_in_progress, "This should only be the recursive case."); | |
4088 handle_evacuation_failure_common(old, m); | |
4089 } | |
4090 return old; | |
4091 } else { | |
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4092 // Forward-to-self failed. Either someone else managed to allocate |
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|
4093 // space for this object (old != forward_ptr) or they beat us in |
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|
4094 // self-forwarding it (old == forward_ptr). |
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|
4095 assert(old == forward_ptr || !obj_in_cs(forward_ptr), |
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|
4096 err_msg("obj: "PTR_FORMAT" forwarded to: "PTR_FORMAT" " |
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|
4097 "should not be in the CSet", |
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|
4098 (HeapWord*) old, (HeapWord*) forward_ptr)); |
342 | 4099 return forward_ptr; |
4100 } | |
4101 } | |
4102 | |
4103 void G1CollectedHeap::handle_evacuation_failure_common(oop old, markOop m) { | |
4104 set_evacuation_failed(true); | |
4105 | |
4106 preserve_mark_if_necessary(old, m); | |
4107 | |
4108 HeapRegion* r = heap_region_containing(old); | |
4109 if (!r->evacuation_failed()) { | |
4110 r->set_evacuation_failed(true); | |
3778
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7049999: G1: Make the G1PrintHeapRegions output consistent and complete
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|
4111 _hr_printer.evac_failure(r); |
342 | 4112 } |
4113 | |
4114 push_on_evac_failure_scan_stack(old); | |
4115 | |
4116 if (!_drain_in_progress) { | |
4117 // prevent recursion in copy_to_survivor_space() | |
4118 _drain_in_progress = true; | |
4119 drain_evac_failure_scan_stack(); | |
4120 _drain_in_progress = false; | |
4121 } | |
4122 } | |
4123 | |
4124 void G1CollectedHeap::preserve_mark_if_necessary(oop obj, markOop m) { | |
2038
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|
4125 assert(evacuation_failed(), "Oversaving!"); |
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4126 // We want to call the "for_promotion_failure" version only in the |
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|
4127 // case of a promotion failure. |
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|
4128 if (m->must_be_preserved_for_promotion_failure(obj)) { |
342 | 4129 if (_objs_with_preserved_marks == NULL) { |
4130 assert(_preserved_marks_of_objs == NULL, "Both or none."); | |
4131 _objs_with_preserved_marks = | |
4132 new (ResourceObj::C_HEAP) GrowableArray<oop>(40, true); | |
4133 _preserved_marks_of_objs = | |
4134 new (ResourceObj::C_HEAP) GrowableArray<markOop>(40, true); | |
4135 } | |
4136 _objs_with_preserved_marks->push(obj); | |
4137 _preserved_marks_of_objs->push(m); | |
4138 } | |
4139 } | |
4140 | |
4141 HeapWord* G1CollectedHeap::par_allocate_during_gc(GCAllocPurpose purpose, | |
4142 size_t word_size) { | |
3830
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4143 if (purpose == GCAllocForSurvived) { |
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4144 HeapWord* result = survivor_attempt_allocation(word_size); |
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4145 if (result != NULL) { |
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|
4146 return result; |
342 | 4147 } else { |
3830
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|
4148 // Let's try to allocate in the old gen in case we can fit the |
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|
4149 // object there. |
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|
4150 return old_attempt_allocation(word_size); |
342 | 4151 } |
3830
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|
4152 } else { |
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|
4153 assert(purpose == GCAllocForTenured, "sanity"); |
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|
4154 HeapWord* result = old_attempt_allocation(word_size); |
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|
4155 if (result != NULL) { |
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|
4156 return result; |
342 | 4157 } else { |
3830
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|
4158 // Let's try to allocate in the survivors in case we can fit the |
f44782f04dd4
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|
4159 // object there. |
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|
4160 return survivor_attempt_allocation(word_size); |
342 | 4161 } |
3830
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|
4162 } |
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|
4163 |
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|
4164 ShouldNotReachHere(); |
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|
4165 // Trying to keep some compilers happy. |
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|
4166 return NULL; |
342 | 4167 } |
4168 | |
4169 #ifndef PRODUCT | |
4170 bool GCLabBitMapClosure::do_bit(size_t offset) { | |
4171 HeapWord* addr = _bitmap->offsetToHeapWord(offset); | |
4172 guarantee(_cm->isMarked(oop(addr)), "it should be!"); | |
4173 return true; | |
4174 } | |
4175 #endif // PRODUCT | |
4176 | |
3886
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7080389: G1: refactor marking code in evacuation pause copy closures
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|
4177 G1ParGCAllocBuffer::G1ParGCAllocBuffer(size_t gclab_word_size) : |
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|
4178 ParGCAllocBuffer(gclab_word_size), |
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|
4179 _should_mark_objects(false), |
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|
4180 _bitmap(G1CollectedHeap::heap()->reserved_region().start(), gclab_word_size), |
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|
4181 _retired(false) |
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|
4182 { |
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|
4183 //_should_mark_objects is set to true when G1ParCopyHelper needs to |
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|
4184 // mark the forwarded location of an evacuated object. |
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|
4185 // We set _should_mark_objects to true if marking is active, i.e. when we |
eeae91c9baba
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|
4186 // need to propagate a mark, or during an initial mark pause, i.e. when we |
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|
4187 // need to mark objects immediately reachable by the roots. |
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|
4188 if (G1CollectedHeap::heap()->mark_in_progress() || |
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7080389: G1: refactor marking code in evacuation pause copy closures
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|
4189 G1CollectedHeap::heap()->g1_policy()->during_initial_mark_pause()) { |
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7080389: G1: refactor marking code in evacuation pause copy closures
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|
4190 _should_mark_objects = true; |
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|
4191 } |
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|
4192 } |
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|
4193 |
845
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|
4194 G1ParScanThreadState::G1ParScanThreadState(G1CollectedHeap* g1h, int queue_num) |
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4195 : _g1h(g1h), |
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4196 _refs(g1h->task_queue(queue_num)), |
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4197 _dcq(&g1h->dirty_card_queue_set()), |
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4198 _ct_bs((CardTableModRefBS*)_g1h->barrier_set()), |
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|
4199 _g1_rem(g1h->g1_rem_set()), |
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6700789: G1: Enable use of compressed oops with G1 heaps
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|
4200 _hash_seed(17), _queue_num(queue_num), |
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|
4201 _term_attempts(0), |
1391
79e419e5ea3b
6942253: G1: replace G1ParallelGCAllocBufferSize with YoungPLABSize and OldPLABSize
apetrusenko
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1390
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|
4202 _surviving_alloc_buffer(g1h->desired_plab_sz(GCAllocForSurvived)), |
79e419e5ea3b
6942253: G1: replace G1ParallelGCAllocBufferSize with YoungPLABSize and OldPLABSize
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|
4203 _tenured_alloc_buffer(g1h->desired_plab_sz(GCAllocForTenured)), |
845
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|
4204 _age_table(false), |
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|
4205 _strong_roots_time(0), _term_time(0), |
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|
4206 _alloc_buffer_waste(0), _undo_waste(0) |
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|
4207 { |
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|
4208 // we allocate G1YoungSurvRateNumRegions plus one entries, since |
df6caf649ff7
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diff
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|
4209 // we "sacrifice" entry 0 to keep track of surviving bytes for |
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|
4210 // non-young regions (where the age is -1) |
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diff
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|
4211 // We also add a few elements at the beginning and at the end in |
df6caf649ff7
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diff
changeset
|
4212 // an attempt to eliminate cache contention |
4090
a88de71c4e3a
7097002: G1: remove a lot of unused / redundant code from the G1CollectorPolicy class
tonyp
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4073
diff
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|
4213 size_t real_length = 1 + _g1h->g1_policy()->young_cset_region_length(); |
845
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|
4214 size_t array_length = PADDING_ELEM_NUM + |
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diff
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|
4215 real_length + |
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|
4216 PADDING_ELEM_NUM; |
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4217 _surviving_young_words_base = NEW_C_HEAP_ARRAY(size_t, array_length); |
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4218 if (_surviving_young_words_base == NULL) |
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4219 vm_exit_out_of_memory(array_length * sizeof(size_t), |
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4220 "Not enough space for young surv histo."); |
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4221 _surviving_young_words = _surviving_young_words_base + PADDING_ELEM_NUM; |
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4222 memset(_surviving_young_words, 0, real_length * sizeof(size_t)); |
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4223 |
1391
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|
4224 _alloc_buffers[GCAllocForSurvived] = &_surviving_alloc_buffer; |
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4225 _alloc_buffers[GCAllocForTenured] = &_tenured_alloc_buffer; |
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4226 |
845
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4227 _start = os::elapsedTime(); |
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4228 } |
342 | 4229 |
1709 | 4230 void |
4231 G1ParScanThreadState::print_termination_stats_hdr(outputStream* const st) | |
4232 { | |
4233 st->print_raw_cr("GC Termination Stats"); | |
4234 st->print_raw_cr(" elapsed --strong roots-- -------termination-------" | |
4235 " ------waste (KiB)------"); | |
4236 st->print_raw_cr("thr ms ms % ms % attempts" | |
4237 " total alloc undo"); | |
4238 st->print_raw_cr("--- --------- --------- ------ --------- ------ --------" | |
4239 " ------- ------- -------"); | |
4240 } | |
4241 | |
4242 void | |
4243 G1ParScanThreadState::print_termination_stats(int i, | |
4244 outputStream* const st) const | |
4245 { | |
4246 const double elapsed_ms = elapsed_time() * 1000.0; | |
4247 const double s_roots_ms = strong_roots_time() * 1000.0; | |
4248 const double term_ms = term_time() * 1000.0; | |
4249 st->print_cr("%3d %9.2f %9.2f %6.2f " | |
4250 "%9.2f %6.2f " SIZE_FORMAT_W(8) " " | |
4251 SIZE_FORMAT_W(7) " " SIZE_FORMAT_W(7) " " SIZE_FORMAT_W(7), | |
4252 i, elapsed_ms, s_roots_ms, s_roots_ms * 100 / elapsed_ms, | |
4253 term_ms, term_ms * 100 / elapsed_ms, term_attempts(), | |
4254 (alloc_buffer_waste() + undo_waste()) * HeapWordSize / K, | |
4255 alloc_buffer_waste() * HeapWordSize / K, | |
4256 undo_waste() * HeapWordSize / K); | |
4257 } | |
4258 | |
1862
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|
4259 #ifdef ASSERT |
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4260 bool G1ParScanThreadState::verify_ref(narrowOop* ref) const { |
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4261 assert(ref != NULL, "invariant"); |
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4262 assert(UseCompressedOops, "sanity"); |
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4263 assert(!has_partial_array_mask(ref), err_msg("ref=" PTR_FORMAT, ref)); |
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4264 oop p = oopDesc::load_decode_heap_oop(ref); |
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4265 assert(_g1h->is_in_g1_reserved(p), |
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4266 err_msg("ref=" PTR_FORMAT " p=" PTR_FORMAT, ref, intptr_t(p))); |
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|
4267 return true; |
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|
4268 } |
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|
4269 |
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|
4270 bool G1ParScanThreadState::verify_ref(oop* ref) const { |
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4271 assert(ref != NULL, "invariant"); |
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|
4272 if (has_partial_array_mask(ref)) { |
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4273 // Must be in the collection set--it's already been copied. |
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|
4274 oop p = clear_partial_array_mask(ref); |
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4275 assert(_g1h->obj_in_cs(p), |
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4276 err_msg("ref=" PTR_FORMAT " p=" PTR_FORMAT, ref, intptr_t(p))); |
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4277 } else { |
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|
4278 oop p = oopDesc::load_decode_heap_oop(ref); |
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4279 assert(_g1h->is_in_g1_reserved(p), |
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|
4280 err_msg("ref=" PTR_FORMAT " p=" PTR_FORMAT, ref, intptr_t(p))); |
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|
4281 } |
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|
4282 return true; |
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|
4283 } |
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|
4284 |
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|
4285 bool G1ParScanThreadState::verify_task(StarTask ref) const { |
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4286 if (ref.is_narrow()) { |
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4287 return verify_ref((narrowOop*) ref); |
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|
4288 } else { |
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4289 return verify_ref((oop*) ref); |
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|
4290 } |
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|
4291 } |
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|
4292 #endif // ASSERT |
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|
4293 |
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|
4294 void G1ParScanThreadState::trim_queue() { |
3979
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6484982: G1: process references during evacuation pauses
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|
4295 assert(_evac_cl != NULL, "not set"); |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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|
4296 assert(_evac_failure_cl != NULL, "not set"); |
4dfb2df418f2
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|
4297 assert(_partial_scan_cl != NULL, "not set"); |
4dfb2df418f2
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|
4298 |
1862
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|
4299 StarTask ref; |
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|
4300 do { |
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|
4301 // Drain the overflow stack first, so other threads can steal. |
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6989448: G1: refactor and simplify G1ParScanThreadState
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|
4302 while (refs()->pop_overflow(ref)) { |
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|
4303 deal_with_reference(ref); |
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|
4304 } |
3979
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|
4305 |
1862
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|
4306 while (refs()->pop_local(ref)) { |
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|
4307 deal_with_reference(ref); |
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|
4308 } |
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|
4309 } while (!refs()->is_empty()); |
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|
4310 } |
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|
4311 |
342 | 4312 G1ParClosureSuper::G1ParClosureSuper(G1CollectedHeap* g1, G1ParScanThreadState* par_scan_state) : |
4313 _g1(g1), _g1_rem(_g1->g1_rem_set()), _cm(_g1->concurrent_mark()), | |
3886
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4314 _par_scan_state(par_scan_state), |
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4315 _during_initial_mark(_g1->g1_policy()->during_initial_mark_pause()), |
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4316 _mark_in_progress(_g1->mark_in_progress()) { } |
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|
4317 |
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|
4318 template <class T> void G1ParCopyHelper::mark_object(T* p) { |
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4319 // This is called from do_oop_work for objects that are not |
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4320 // in the collection set. Objects in the collection set |
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|
4321 // are marked after they have been evacuated. |
342 | 4322 |
845
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|
4323 T heap_oop = oopDesc::load_heap_oop(p); |
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|
4324 if (!oopDesc::is_null(heap_oop)) { |
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4325 oop obj = oopDesc::decode_heap_oop(heap_oop); |
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|
4326 HeapWord* addr = (HeapWord*)obj; |
3323
75af3e8de182
7040450: G1: assert((_g1->evacuation_failed()) || (!_g1->obj_in_cs(obj))) failed: shouldn't still be in ...
tonyp
parents:
3317
diff
changeset
|
4327 if (_g1->is_in_g1_reserved(addr)) { |
342 | 4328 _cm->grayRoot(oop(addr)); |
3323
75af3e8de182
7040450: G1: assert((_g1->evacuation_failed()) || (!_g1->obj_in_cs(obj))) failed: shouldn't still be in ...
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|
4329 } |
342 | 4330 } |
4331 } | |
4332 | |
3973
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|
4333 oop G1ParCopyHelper::copy_to_survivor_space(oop old, bool should_mark_root, |
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|
4334 bool should_mark_copy) { |
342 | 4335 size_t word_sz = old->size(); |
4336 HeapRegion* from_region = _g1->heap_region_containing_raw(old); | |
4337 // +1 to make the -1 indexes valid... | |
4338 int young_index = from_region->young_index_in_cset()+1; | |
4339 assert( (from_region->is_young() && young_index > 0) || | |
4340 (!from_region->is_young() && young_index == 0), "invariant" ); | |
4341 G1CollectorPolicy* g1p = _g1->g1_policy(); | |
4342 markOop m = old->mark(); | |
545 | 4343 int age = m->has_displaced_mark_helper() ? m->displaced_mark_helper()->age() |
4344 : m->age(); | |
4345 GCAllocPurpose alloc_purpose = g1p->evacuation_destination(from_region, age, | |
342 | 4346 word_sz); |
4347 HeapWord* obj_ptr = _par_scan_state->allocate(alloc_purpose, word_sz); | |
4348 oop obj = oop(obj_ptr); | |
4349 | |
4350 if (obj_ptr == NULL) { | |
4351 // This will either forward-to-self, or detect that someone else has | |
4352 // installed a forwarding pointer. | |
4353 OopsInHeapRegionClosure* cl = _par_scan_state->evac_failure_closure(); | |
3973
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diff
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|
4354 return _g1->handle_evacuation_failure_par(cl, old, should_mark_root); |
342 | 4355 } |
4356 | |
526 | 4357 // We're going to allocate linearly, so might as well prefetch ahead. |
4358 Prefetch::write(obj_ptr, PrefetchCopyIntervalInBytes); | |
4359 | |
342 | 4360 oop forward_ptr = old->forward_to_atomic(obj); |
4361 if (forward_ptr == NULL) { | |
4362 Copy::aligned_disjoint_words((HeapWord*) old, obj_ptr, word_sz); | |
526 | 4363 if (g1p->track_object_age(alloc_purpose)) { |
4364 // We could simply do obj->incr_age(). However, this causes a | |
4365 // performance issue. obj->incr_age() will first check whether | |
4366 // the object has a displaced mark by checking its mark word; | |
4367 // getting the mark word from the new location of the object | |
4368 // stalls. So, given that we already have the mark word and we | |
4369 // are about to install it anyway, it's better to increase the | |
4370 // age on the mark word, when the object does not have a | |
4371 // displaced mark word. We're not expecting many objects to have | |
4372 // a displaced marked word, so that case is not optimized | |
4373 // further (it could be...) and we simply call obj->incr_age(). | |
4374 | |
4375 if (m->has_displaced_mark_helper()) { | |
4376 // in this case, we have to install the mark word first, | |
4377 // otherwise obj looks to be forwarded (the old mark word, | |
4378 // which contains the forward pointer, was copied) | |
4379 obj->set_mark(m); | |
4380 obj->incr_age(); | |
4381 } else { | |
4382 m = m->incr_age(); | |
545 | 4383 obj->set_mark(m); |
526 | 4384 } |
545 | 4385 _par_scan_state->age_table()->add(obj, word_sz); |
4386 } else { | |
4387 obj->set_mark(m); | |
526 | 4388 } |
4389 | |
3886
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4390 // Mark the evacuated object or propagate "next" mark bit |
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4391 if (should_mark_copy) { |
342 | 4392 if (!use_local_bitmaps || |
4393 !_par_scan_state->alloc_buffer(alloc_purpose)->mark(obj_ptr)) { | |
4394 // if we couldn't mark it on the local bitmap (this happens when | |
4395 // the object was not allocated in the GCLab), we have to bite | |
4396 // the bullet and do the standard parallel mark | |
4397 _cm->markAndGrayObjectIfNecessary(obj); | |
4398 } | |
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|
4399 |
342 | 4400 if (_g1->isMarkedNext(old)) { |
3886
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|
4401 // Unmark the object's old location so that marking |
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|
4402 // doesn't think the old object is alive. |
342 | 4403 _cm->nextMarkBitMap()->parClear((HeapWord*)old); |
4404 } | |
4405 } | |
4406 | |
4407 size_t* surv_young_words = _par_scan_state->surviving_young_words(); | |
4408 surv_young_words[young_index] += word_sz; | |
4409 | |
4410 if (obj->is_objArray() && arrayOop(obj)->length() >= ParGCArrayScanChunk) { | |
4411 arrayOop(old)->set_length(0); | |
845
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|
4412 oop* old_p = set_partial_array_mask(old); |
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4413 _par_scan_state->push_on_queue(old_p); |
342 | 4414 } else { |
526 | 4415 // No point in using the slower heap_region_containing() method, |
4416 // given that we know obj is in the heap. | |
4417 _scanner->set_region(_g1->heap_region_containing_raw(obj)); | |
342 | 4418 obj->oop_iterate_backwards(_scanner); |
4419 } | |
4420 } else { | |
4421 _par_scan_state->undo_allocation(alloc_purpose, obj_ptr, word_sz); | |
4422 obj = forward_ptr; | |
4423 } | |
4424 return obj; | |
4425 } | |
4426 | |
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|
4427 template <bool do_gen_barrier, G1Barrier barrier, bool do_mark_object> |
845
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4428 template <class T> |
3886
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|
4429 void G1ParCopyClosure<do_gen_barrier, barrier, do_mark_object> |
845
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4430 ::do_oop_work(T* p) { |
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4431 oop obj = oopDesc::load_decode_heap_oop(p); |
342 | 4432 assert(barrier != G1BarrierRS || obj != NULL, |
4433 "Precondition: G1BarrierRS implies obj is nonNull"); | |
4434 | |
3886
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|
4435 // Marking: |
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7080389: G1: refactor marking code in evacuation pause copy closures
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|
4436 // If the object is in the collection set, then the thread |
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7080389: G1: refactor marking code in evacuation pause copy closures
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|
4437 // that copies the object should mark, or propagate the |
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7080389: G1: refactor marking code in evacuation pause copy closures
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changeset
|
4438 // mark to, the evacuated object. |
eeae91c9baba
7080389: G1: refactor marking code in evacuation pause copy closures
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changeset
|
4439 // If the object is not in the collection set then we |
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7080389: G1: refactor marking code in evacuation pause copy closures
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changeset
|
4440 // should call the mark_object() method depending on the |
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7080389: G1: refactor marking code in evacuation pause copy closures
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changeset
|
4441 // value of the template parameter do_mark_object (which will |
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changeset
|
4442 // be true for root scanning closures during an initial mark |
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7080389: G1: refactor marking code in evacuation pause copy closures
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changeset
|
4443 // pause). |
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changeset
|
4444 // The mark_object() method first checks whether the object |
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|
4445 // is marked and, if not, attempts to mark the object. |
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7080389: G1: refactor marking code in evacuation pause copy closures
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|
4446 |
526 | 4447 // here the null check is implicit in the cset_fast_test() test |
1261
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changeset
|
4448 if (_g1->in_cset_fast_test(obj)) { |
526 | 4449 if (obj->is_forwarded()) { |
845
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changeset
|
4450 oopDesc::encode_store_heap_oop(p, obj->forwardee()); |
3886
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|
4451 // If we are a root scanning closure during an initial |
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changeset
|
4452 // mark pause (i.e. do_mark_object will be true) then |
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|
4453 // we also need to handle marking of roots in the |
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7080389: G1: refactor marking code in evacuation pause copy closures
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|
4454 // event of an evacuation failure. In the event of an |
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changeset
|
4455 // evacuation failure, the object is forwarded to itself |
3973
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7092412: G1: Some roots not marked during an initial mark that gets an evacuation failure
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changeset
|
4456 // and not copied. For root-scanning closures, the |
663cb89032b1
7092412: G1: Some roots not marked during an initial mark that gets an evacuation failure
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changeset
|
4457 // object would be marked after a successful self-forward |
663cb89032b1
7092412: G1: Some roots not marked during an initial mark that gets an evacuation failure
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changeset
|
4458 // but an object could be pointed to by both a root and non |
663cb89032b1
7092412: G1: Some roots not marked during an initial mark that gets an evacuation failure
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changeset
|
4459 // root location and be self-forwarded by a non-root-scanning |
663cb89032b1
7092412: G1: Some roots not marked during an initial mark that gets an evacuation failure
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|
4460 // closure. Therefore we also have to attempt to mark the |
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7092412: G1: Some roots not marked during an initial mark that gets an evacuation failure
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changeset
|
4461 // self-forwarded root object here. |
3886
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changeset
|
4462 if (do_mark_object && obj->forwardee() == obj) { |
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7080389: G1: refactor marking code in evacuation pause copy closures
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changeset
|
4463 mark_object(p); |
eeae91c9baba
7080389: G1: refactor marking code in evacuation pause copy closures
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|
4464 } |
526 | 4465 } else { |
3973
663cb89032b1
7092412: G1: Some roots not marked during an initial mark that gets an evacuation failure
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parents:
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diff
changeset
|
4466 // During an initial mark pause, objects that are pointed to |
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7092412: G1: Some roots not marked during an initial mark that gets an evacuation failure
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changeset
|
4467 // by the roots need to be marked - even in the event of an |
663cb89032b1
7092412: G1: Some roots not marked during an initial mark that gets an evacuation failure
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changeset
|
4468 // evacuation failure. We pass the template parameter |
663cb89032b1
7092412: G1: Some roots not marked during an initial mark that gets an evacuation failure
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parents:
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diff
changeset
|
4469 // do_mark_object (which is true for root scanning closures |
663cb89032b1
7092412: G1: Some roots not marked during an initial mark that gets an evacuation failure
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parents:
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diff
changeset
|
4470 // during an initial mark pause) to copy_to_survivor_space |
663cb89032b1
7092412: G1: Some roots not marked during an initial mark that gets an evacuation failure
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parents:
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diff
changeset
|
4471 // which will pass it on to the evacuation failure handling |
663cb89032b1
7092412: G1: Some roots not marked during an initial mark that gets an evacuation failure
johnc
parents:
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diff
changeset
|
4472 // code. The thread that successfully self-forwards a root |
663cb89032b1
7092412: G1: Some roots not marked during an initial mark that gets an evacuation failure
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parents:
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diff
changeset
|
4473 // object to itself is responsible for marking the object. |
663cb89032b1
7092412: G1: Some roots not marked during an initial mark that gets an evacuation failure
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parents:
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changeset
|
4474 bool should_mark_root = do_mark_object; |
663cb89032b1
7092412: G1: Some roots not marked during an initial mark that gets an evacuation failure
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changeset
|
4475 |
3886
eeae91c9baba
7080389: G1: refactor marking code in evacuation pause copy closures
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diff
changeset
|
4476 // We need to mark the copied object if we're a root scanning |
eeae91c9baba
7080389: G1: refactor marking code in evacuation pause copy closures
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changeset
|
4477 // closure during an initial mark pause (i.e. do_mark_object |
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7080389: G1: refactor marking code in evacuation pause copy closures
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parents:
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changeset
|
4478 // will be true), or the object is already marked and we need |
eeae91c9baba
7080389: G1: refactor marking code in evacuation pause copy closures
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parents:
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diff
changeset
|
4479 // to propagate the mark to the evacuated copy. |
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changeset
|
4480 bool should_mark_copy = do_mark_object || |
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diff
changeset
|
4481 _during_initial_mark || |
eeae91c9baba
7080389: G1: refactor marking code in evacuation pause copy closures
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parents:
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diff
changeset
|
4482 (_mark_in_progress && !_g1->is_obj_ill(obj)); |
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7080389: G1: refactor marking code in evacuation pause copy closures
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|
4483 |
3973
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7092412: G1: Some roots not marked during an initial mark that gets an evacuation failure
johnc
parents:
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diff
changeset
|
4484 oop copy_oop = copy_to_survivor_space(obj, should_mark_root, |
663cb89032b1
7092412: G1: Some roots not marked during an initial mark that gets an evacuation failure
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diff
changeset
|
4485 should_mark_copy); |
845
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6700789: G1: Enable use of compressed oops with G1 heaps
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changeset
|
4486 oopDesc::encode_store_heap_oop(p, copy_oop); |
342 | 4487 } |
526 | 4488 // When scanning the RS, we only care about objs in CS. |
4489 if (barrier == G1BarrierRS) { | |
616
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6720309: G1: don't synchronously update RSet during evacuation pauses
iveresov
parents:
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diff
changeset
|
4490 _par_scan_state->update_rs(_from, p, _par_scan_state->queue_num()); |
342 | 4491 } |
3886
eeae91c9baba
7080389: G1: refactor marking code in evacuation pause copy closures
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parents:
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changeset
|
4492 } else { |
eeae91c9baba
7080389: G1: refactor marking code in evacuation pause copy closures
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parents:
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diff
changeset
|
4493 // The object is not in collection set. If we're a root scanning |
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changeset
|
4494 // closure during an initial mark pause (i.e. do_mark_object will |
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7080389: G1: refactor marking code in evacuation pause copy closures
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changeset
|
4495 // be true) then attempt to mark the object. |
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7080389: G1: refactor marking code in evacuation pause copy closures
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parents:
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diff
changeset
|
4496 if (do_mark_object) { |
eeae91c9baba
7080389: G1: refactor marking code in evacuation pause copy closures
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parents:
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changeset
|
4497 mark_object(p); |
eeae91c9baba
7080389: G1: refactor marking code in evacuation pause copy closures
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|
4498 } |
526 | 4499 } |
4500 | |
4501 if (barrier == G1BarrierEvac && obj != NULL) { | |
616
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parents:
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|
4502 _par_scan_state->update_rs(_from, p, _par_scan_state->queue_num()); |
526 | 4503 } |
4504 | |
4505 if (do_gen_barrier && obj != NULL) { | |
4506 par_do_barrier(p); | |
4507 } | |
4508 } | |
4509 | |
1261
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1245
diff
changeset
|
4510 template void G1ParCopyClosure<false, G1BarrierEvac, false>::do_oop_work(oop* p); |
0414c1049f15
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|
4511 template void G1ParCopyClosure<false, G1BarrierEvac, false>::do_oop_work(narrowOop* p); |
845
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|
4512 |
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|
4513 template <class T> void G1ParScanPartialArrayClosure::do_oop_nv(T* p) { |
526 | 4514 assert(has_partial_array_mask(p), "invariant"); |
4515 oop old = clear_partial_array_mask(p); | |
342 | 4516 assert(old->is_objArray(), "must be obj array"); |
4517 assert(old->is_forwarded(), "must be forwarded"); | |
4518 assert(Universe::heap()->is_in_reserved(old), "must be in heap."); | |
4519 | |
4520 objArrayOop obj = objArrayOop(old->forwardee()); | |
4521 assert((void*)old != (void*)old->forwardee(), "self forwarding here?"); | |
4522 // Process ParGCArrayScanChunk elements now | |
4523 // and push the remainder back onto queue | |
4524 int start = arrayOop(old)->length(); | |
4525 int end = obj->length(); | |
4526 int remainder = end - start; | |
4527 assert(start <= end, "just checking"); | |
4528 if (remainder > 2 * ParGCArrayScanChunk) { | |
4529 // Test above combines last partial chunk with a full chunk | |
4530 end = start + ParGCArrayScanChunk; | |
4531 arrayOop(old)->set_length(end); | |
4532 // Push remainder. | |
845
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changeset
|
4533 oop* old_p = set_partial_array_mask(old); |
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
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diff
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|
4534 assert(arrayOop(old)->length() < obj->length(), "Empty push?"); |
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|
4535 _par_scan_state->push_on_queue(old_p); |
342 | 4536 } else { |
4537 // Restore length so that the heap remains parsable in | |
4538 // case of evacuation failure. | |
4539 arrayOop(old)->set_length(end); | |
4540 } | |
845
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|
4541 _scanner.set_region(_g1->heap_region_containing_raw(obj)); |
342 | 4542 // process our set of indices (include header in first chunk) |
845
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|
4543 obj->oop_iterate_range(&_scanner, start, end); |
342 | 4544 } |
4545 | |
4546 class G1ParEvacuateFollowersClosure : public VoidClosure { | |
4547 protected: | |
4548 G1CollectedHeap* _g1h; | |
4549 G1ParScanThreadState* _par_scan_state; | |
4550 RefToScanQueueSet* _queues; | |
4551 ParallelTaskTerminator* _terminator; | |
4552 | |
4553 G1ParScanThreadState* par_scan_state() { return _par_scan_state; } | |
4554 RefToScanQueueSet* queues() { return _queues; } | |
4555 ParallelTaskTerminator* terminator() { return _terminator; } | |
4556 | |
4557 public: | |
4558 G1ParEvacuateFollowersClosure(G1CollectedHeap* g1h, | |
4559 G1ParScanThreadState* par_scan_state, | |
4560 RefToScanQueueSet* queues, | |
4561 ParallelTaskTerminator* terminator) | |
4562 : _g1h(g1h), _par_scan_state(par_scan_state), | |
4563 _queues(queues), _terminator(terminator) {} | |
4564 | |
1862
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diff
changeset
|
4565 void do_void(); |
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|
4566 |
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|
4567 private: |
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changeset
|
4568 inline bool offer_termination(); |
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|
4569 }; |
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diff
changeset
|
4570 |
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diff
changeset
|
4571 bool G1ParEvacuateFollowersClosure::offer_termination() { |
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6989448: G1: refactor and simplify G1ParScanThreadState
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|
4572 G1ParScanThreadState* const pss = par_scan_state(); |
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6989448: G1: refactor and simplify G1ParScanThreadState
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diff
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|
4573 pss->start_term_time(); |
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|
4574 const bool res = terminator()->offer_termination(); |
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diff
changeset
|
4575 pss->end_term_time(); |
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6989448: G1: refactor and simplify G1ParScanThreadState
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diff
changeset
|
4576 return res; |
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diff
changeset
|
4577 } |
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diff
changeset
|
4578 |
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diff
changeset
|
4579 void G1ParEvacuateFollowersClosure::do_void() { |
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6989448: G1: refactor and simplify G1ParScanThreadState
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diff
changeset
|
4580 StarTask stolen_task; |
b14ec34b1e07
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diff
changeset
|
4581 G1ParScanThreadState* const pss = par_scan_state(); |
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diff
changeset
|
4582 pss->trim_queue(); |
b14ec34b1e07
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diff
changeset
|
4583 |
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diff
changeset
|
4584 do { |
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diff
changeset
|
4585 while (queues()->steal(pss->queue_num(), pss->hash_seed(), stolen_task)) { |
b14ec34b1e07
6989448: G1: refactor and simplify G1ParScanThreadState
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diff
changeset
|
4586 assert(pss->verify_task(stolen_task), "sanity"); |
b14ec34b1e07
6989448: G1: refactor and simplify G1ParScanThreadState
jcoomes
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diff
changeset
|
4587 if (stolen_task.is_narrow()) { |
1883
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6990359: G1: don't push a stolen entry on the taskqueue, deal with it directly
tonyp
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1862
diff
changeset
|
4588 pss->deal_with_reference((narrowOop*) stolen_task); |
1862
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6989448: G1: refactor and simplify G1ParScanThreadState
jcoomes
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diff
changeset
|
4589 } else { |
1883
35e4e086d5f5
6990359: G1: don't push a stolen entry on the taskqueue, deal with it directly
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1862
diff
changeset
|
4590 pss->deal_with_reference((oop*) stolen_task); |
1862
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diff
changeset
|
4591 } |
1883
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6990359: G1: don't push a stolen entry on the taskqueue, deal with it directly
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1862
diff
changeset
|
4592 |
35e4e086d5f5
6990359: G1: don't push a stolen entry on the taskqueue, deal with it directly
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1862
diff
changeset
|
4593 // 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
|
4594 // 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
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4595 // we drain the queues as necessary. |
342 | 4596 pss->trim_queue(); |
4597 } | |
1862
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4598 } while (!offer_termination()); |
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4599 |
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4600 pss->retire_alloc_buffers(); |
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4601 } |
342 | 4602 |
4603 class G1ParTask : public AbstractGangTask { | |
4604 protected: | |
4605 G1CollectedHeap* _g1h; | |
4606 RefToScanQueueSet *_queues; | |
4607 ParallelTaskTerminator _terminator; | |
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4608 int _n_workers; |
342 | 4609 |
4610 Mutex _stats_lock; | |
4611 Mutex* stats_lock() { return &_stats_lock; } | |
4612 | |
4613 size_t getNCards() { | |
4614 return (_g1h->capacity() + G1BlockOffsetSharedArray::N_bytes - 1) | |
4615 / G1BlockOffsetSharedArray::N_bytes; | |
4616 } | |
4617 | |
4618 public: | |
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4619 G1ParTask(G1CollectedHeap* g1h, |
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4620 RefToScanQueueSet *task_queues) |
342 | 4621 : AbstractGangTask("G1 collection"), |
4622 _g1h(g1h), | |
4623 _queues(task_queues), | |
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4624 _terminator(0, _queues), |
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4625 _stats_lock(Mutex::leaf, "parallel G1 stats lock", true) |
342 | 4626 {} |
4627 | |
4628 RefToScanQueueSet* queues() { return _queues; } | |
4629 | |
4630 RefToScanQueue *work_queue(int i) { | |
4631 return queues()->queue(i); | |
4632 } | |
4633 | |
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4634 ParallelTaskTerminator* terminator() { return &_terminator; } |
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4635 |
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4636 virtual void set_for_termination(int active_workers) { |
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4637 // This task calls set_n_termination() in par_non_clean_card_iterate_work() |
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4638 // in the young space (_par_seq_tasks) in the G1 heap |
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4639 // for SequentialSubTasksDone. |
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4640 // This task also uses SubTasksDone in SharedHeap and G1CollectedHeap |
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4641 // both of which need setting by set_n_termination(). |
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4642 _g1h->SharedHeap::set_n_termination(active_workers); |
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4643 _g1h->set_n_termination(active_workers); |
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4644 terminator()->reset_for_reuse(active_workers); |
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4645 _n_workers = active_workers; |
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4646 } |
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4647 |
342 | 4648 void work(int i) { |
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4649 if (i >= _n_workers) return; // no work needed this round |
1611 | 4650 |
4651 double start_time_ms = os::elapsedTime() * 1000.0; | |
4652 _g1h->g1_policy()->record_gc_worker_start_time(i, start_time_ms); | |
4653 | |
342 | 4654 ResourceMark rm; |
4655 HandleMark hm; | |
4656 | |
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4657 ReferenceProcessor* rp = _g1h->ref_processor_stw(); |
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4658 |
526 | 4659 G1ParScanThreadState pss(_g1h, i); |
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4660 G1ParScanHeapEvacClosure scan_evac_cl(_g1h, &pss, rp); |
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4661 G1ParScanHeapEvacFailureClosure evac_failure_cl(_g1h, &pss, rp); |
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4662 G1ParScanPartialArrayClosure partial_scan_cl(_g1h, &pss, rp); |
342 | 4663 |
4664 pss.set_evac_closure(&scan_evac_cl); | |
4665 pss.set_evac_failure_closure(&evac_failure_cl); | |
4666 pss.set_partial_scan_closure(&partial_scan_cl); | |
4667 | |
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4668 G1ParScanExtRootClosure only_scan_root_cl(_g1h, &pss, rp); |
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4669 G1ParScanPermClosure only_scan_perm_cl(_g1h, &pss, rp); |
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4670 |
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4671 G1ParScanAndMarkExtRootClosure scan_mark_root_cl(_g1h, &pss, rp); |
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4672 G1ParScanAndMarkPermClosure scan_mark_perm_cl(_g1h, &pss, rp); |
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4673 |
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4674 OopClosure* scan_root_cl = &only_scan_root_cl; |
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4675 OopsInHeapRegionClosure* scan_perm_cl = &only_scan_perm_cl; |
342 | 4676 |
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4677 if (_g1h->g1_policy()->during_initial_mark_pause()) { |
3979
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4678 // We also need to mark copied objects. |
342 | 4679 scan_root_cl = &scan_mark_root_cl; |
4680 scan_perm_cl = &scan_mark_perm_cl; | |
4681 } | |
4682 | |
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4683 G1ParPushHeapRSClosure push_heap_rs_cl(_g1h, &pss); |
3979
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4684 |
342 | 4685 pss.start_strong_roots(); |
4686 _g1h->g1_process_strong_roots(/* not collecting perm */ false, | |
4687 SharedHeap::SO_AllClasses, | |
4688 scan_root_cl, | |
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4689 &push_heap_rs_cl, |
342 | 4690 scan_perm_cl, |
4691 i); | |
4692 pss.end_strong_roots(); | |
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4693 |
342 | 4694 { |
4695 double start = os::elapsedTime(); | |
4696 G1ParEvacuateFollowersClosure evac(_g1h, &pss, _queues, &_terminator); | |
4697 evac.do_void(); | |
4698 double elapsed_ms = (os::elapsedTime()-start)*1000.0; | |
4699 double term_ms = pss.term_time()*1000.0; | |
4700 _g1h->g1_policy()->record_obj_copy_time(i, elapsed_ms-term_ms); | |
1611 | 4701 _g1h->g1_policy()->record_termination(i, term_ms, pss.term_attempts()); |
342 | 4702 } |
1282 | 4703 _g1h->g1_policy()->record_thread_age_table(pss.age_table()); |
342 | 4704 _g1h->update_surviving_young_words(pss.surviving_young_words()+1); |
4705 | |
4706 // Clean up any par-expanded rem sets. | |
4707 HeapRegionRemSet::par_cleanup(); | |
4708 | |
4709 if (ParallelGCVerbose) { | |
1709 | 4710 MutexLocker x(stats_lock()); |
4711 pss.print_termination_stats(i); | |
342 | 4712 } |
4713 | |
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4714 assert(pss.refs()->is_empty(), "should be empty"); |
1611 | 4715 double end_time_ms = os::elapsedTime() * 1000.0; |
4716 _g1h->g1_policy()->record_gc_worker_end_time(i, end_time_ms); | |
342 | 4717 } |
4718 }; | |
4719 | |
4720 // *** Common G1 Evacuation Stuff | |
4721 | |
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4722 // This method is run in a GC worker. |
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4723 |
342 | 4724 void |
4725 G1CollectedHeap:: | |
4726 g1_process_strong_roots(bool collecting_perm_gen, | |
4727 SharedHeap::ScanningOption so, | |
4728 OopClosure* scan_non_heap_roots, | |
4729 OopsInHeapRegionClosure* scan_rs, | |
4730 OopsInGenClosure* scan_perm, | |
4731 int worker_i) { | |
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4732 |
342 | 4733 // First scan the strong roots, including the perm gen. |
4734 double ext_roots_start = os::elapsedTime(); | |
4735 double closure_app_time_sec = 0.0; | |
4736 | |
4737 BufferingOopClosure buf_scan_non_heap_roots(scan_non_heap_roots); | |
4738 BufferingOopsInGenClosure buf_scan_perm(scan_perm); | |
4739 buf_scan_perm.set_generation(perm_gen()); | |
4740 | |
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4741 // Walk the code cache w/o buffering, because StarTask cannot handle |
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4742 // unaligned oop locations. |
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4743 CodeBlobToOopClosure eager_scan_code_roots(scan_non_heap_roots, /*do_marking=*/ true); |
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4744 |
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4745 process_strong_roots(false, // no scoping; this is parallel code |
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4746 collecting_perm_gen, so, |
342 | 4747 &buf_scan_non_heap_roots, |
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4748 &eager_scan_code_roots, |
342 | 4749 &buf_scan_perm); |
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4750 |
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4751 // Now the CM ref_processor roots. |
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4752 if (!_process_strong_tasks->is_task_claimed(G1H_PS_refProcessor_oops_do)) { |
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4753 // We need to treat the discovered reference lists of the |
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4754 // concurrent mark ref processor as roots and keep entries |
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4755 // (which are added by the marking threads) on them live |
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4756 // until they can be processed at the end of marking. |
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4757 ref_processor_cm()->weak_oops_do(&buf_scan_non_heap_roots); |
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4758 } |
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4759 |
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4760 // Finish up any enqueued closure apps (attributed as object copy time). |
342 | 4761 buf_scan_non_heap_roots.done(); |
4762 buf_scan_perm.done(); | |
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4763 |
342 | 4764 double ext_roots_end = os::elapsedTime(); |
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4765 |
342 | 4766 g1_policy()->reset_obj_copy_time(worker_i); |
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4767 double obj_copy_time_sec = buf_scan_perm.closure_app_seconds() + |
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4768 buf_scan_non_heap_roots.closure_app_seconds(); |
342 | 4769 g1_policy()->record_obj_copy_time(worker_i, obj_copy_time_sec * 1000.0); |
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4770 |
342 | 4771 double ext_root_time_ms = |
4772 ((ext_roots_end - ext_roots_start) - obj_copy_time_sec) * 1000.0; | |
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4773 |
342 | 4774 g1_policy()->record_ext_root_scan_time(worker_i, ext_root_time_ms); |
4775 | |
4776 // Scan strong roots in mark stack. | |
4777 if (!_process_strong_tasks->is_task_claimed(G1H_PS_mark_stack_oops_do)) { | |
4778 concurrent_mark()->oops_do(scan_non_heap_roots); | |
4779 } | |
4780 double mark_stack_scan_ms = (os::elapsedTime() - ext_roots_end) * 1000.0; | |
4781 g1_policy()->record_mark_stack_scan_time(worker_i, mark_stack_scan_ms); | |
4782 | |
4783 // Now scan the complement of the collection set. | |
4784 if (scan_rs != NULL) { | |
4785 g1_rem_set()->oops_into_collection_set_do(scan_rs, worker_i); | |
4786 } | |
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4787 |
342 | 4788 _process_strong_tasks->all_tasks_completed(); |
4789 } | |
4790 | |
4791 void | |
4792 G1CollectedHeap::g1_process_weak_roots(OopClosure* root_closure, | |
4793 OopClosure* non_root_closure) { | |
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4794 CodeBlobToOopClosure roots_in_blobs(root_closure, /*do_marking=*/ false); |
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4795 SharedHeap::process_weak_roots(root_closure, &roots_in_blobs, non_root_closure); |
342 | 4796 } |
4797 | |
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|
4798 // Weak Reference Processing support |
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4799 |
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4800 // An always "is_alive" closure that is used to preserve referents. |
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4801 // If the object is non-null then it's alive. Used in the preservation |
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4802 // of referent objects that are pointed to by reference objects |
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4803 // discovered by the CM ref processor. |
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4804 class G1AlwaysAliveClosure: public BoolObjectClosure { |
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4805 G1CollectedHeap* _g1; |
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4806 public: |
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4807 G1AlwaysAliveClosure(G1CollectedHeap* g1) : _g1(g1) {} |
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4808 void do_object(oop p) { assert(false, "Do not call."); } |
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4809 bool do_object_b(oop p) { |
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|
4810 if (p != NULL) { |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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diff
changeset
|
4811 return true; |
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parents:
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diff
changeset
|
4812 } |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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parents:
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diff
changeset
|
4813 return false; |
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6484982: G1: process references during evacuation pauses
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parents:
3973
diff
changeset
|
4814 } |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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parents:
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diff
changeset
|
4815 }; |
4dfb2df418f2
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parents:
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diff
changeset
|
4816 |
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6484982: G1: process references during evacuation pauses
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parents:
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diff
changeset
|
4817 bool G1STWIsAliveClosure::do_object_b(oop p) { |
4dfb2df418f2
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parents:
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diff
changeset
|
4818 // An object is reachable if it is outside the collection set, |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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parents:
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diff
changeset
|
4819 // or is inside and copied. |
4dfb2df418f2
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parents:
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diff
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|
4820 return !_g1->obj_in_cs(p) || p->is_forwarded(); |
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6484982: G1: process references during evacuation pauses
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parents:
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diff
changeset
|
4821 } |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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parents:
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diff
changeset
|
4822 |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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parents:
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diff
changeset
|
4823 // Non Copying Keep Alive closure |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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parents:
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diff
changeset
|
4824 class G1KeepAliveClosure: public OopClosure { |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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parents:
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diff
changeset
|
4825 G1CollectedHeap* _g1; |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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parents:
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diff
changeset
|
4826 public: |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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parents:
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diff
changeset
|
4827 G1KeepAliveClosure(G1CollectedHeap* g1) : _g1(g1) {} |
4dfb2df418f2
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parents:
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diff
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|
4828 void do_oop(narrowOop* p) { guarantee(false, "Not needed"); } |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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parents:
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diff
changeset
|
4829 void do_oop( oop* p) { |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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parents:
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diff
changeset
|
4830 oop obj = *p; |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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parents:
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diff
changeset
|
4831 |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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parents:
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diff
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|
4832 if (_g1->obj_in_cs(obj)) { |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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parents:
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diff
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|
4833 assert( obj->is_forwarded(), "invariant" ); |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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parents:
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diff
changeset
|
4834 *p = obj->forwardee(); |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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parents:
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diff
changeset
|
4835 } |
4dfb2df418f2
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parents:
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diff
changeset
|
4836 } |
4dfb2df418f2
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parents:
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diff
changeset
|
4837 }; |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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parents:
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diff
changeset
|
4838 |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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parents:
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diff
changeset
|
4839 // Copying Keep Alive closure - can be called from both |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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parents:
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diff
changeset
|
4840 // serial and parallel code as long as different worker |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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parents:
3973
diff
changeset
|
4841 // threads utilize different G1ParScanThreadState instances |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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parents:
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diff
changeset
|
4842 // and different queues. |
4dfb2df418f2
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parents:
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diff
changeset
|
4843 |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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parents:
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diff
changeset
|
4844 class G1CopyingKeepAliveClosure: public OopClosure { |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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parents:
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diff
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|
4845 G1CollectedHeap* _g1h; |
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6484982: G1: process references during evacuation pauses
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parents:
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diff
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|
4846 OopClosure* _copy_non_heap_obj_cl; |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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parents:
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diff
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|
4847 OopsInHeapRegionClosure* _copy_perm_obj_cl; |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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parents:
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diff
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|
4848 G1ParScanThreadState* _par_scan_state; |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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parents:
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diff
changeset
|
4849 |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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parents:
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diff
changeset
|
4850 public: |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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parents:
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diff
changeset
|
4851 G1CopyingKeepAliveClosure(G1CollectedHeap* g1h, |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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parents:
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diff
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|
4852 OopClosure* non_heap_obj_cl, |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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parents:
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diff
changeset
|
4853 OopsInHeapRegionClosure* perm_obj_cl, |
4dfb2df418f2
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parents:
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diff
changeset
|
4854 G1ParScanThreadState* pss): |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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parents:
3973
diff
changeset
|
4855 _g1h(g1h), |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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parents:
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diff
changeset
|
4856 _copy_non_heap_obj_cl(non_heap_obj_cl), |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
4857 _copy_perm_obj_cl(perm_obj_cl), |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
4858 _par_scan_state(pss) |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
4859 {} |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
4860 |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
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diff
changeset
|
4861 virtual void do_oop(narrowOop* p) { do_oop_work(p); } |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
4862 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
|
4863 |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
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diff
changeset
|
4864 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
|
4865 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
|
4866 |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
4867 if (_g1h->obj_in_cs(obj)) { |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
4868 // If the referent object has been forwarded (either copied |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
4869 // to a new location or to itself in the event of an |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
4870 // evacuation failure) then we need to update the reference |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
4871 // field and, if both reference and referent are in the G1 |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
4872 // heap, update the RSet for the referent. |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
4873 // |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
4874 // If the referent has not been forwarded then we have to keep |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
4875 // it alive by policy. Therefore we have copy the referent. |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
4876 // |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
4877 // If the reference field is in the G1 heap then we can push |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
4878 // on the PSS queue. When the queue is drained (after each |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
4879 // phase of reference processing) the object and it's followers |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
4880 // will be copied, the reference field set to point to the |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
4881 // new location, and the RSet updated. Otherwise we need to |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
4882 // use the the non-heap or perm closures directly to copy |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
4883 // the refernt object and update the pointer, while avoiding |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
4884 // updating the RSet. |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
4885 |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
4886 if (_g1h->is_in_g1_reserved(p)) { |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
4887 _par_scan_state->push_on_queue(p); |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
4888 } else { |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
4889 // The reference field is not in the G1 heap. |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
4890 if (_g1h->perm_gen()->is_in(p)) { |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
4891 _copy_perm_obj_cl->do_oop(p); |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
4892 } else { |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
4893 _copy_non_heap_obj_cl->do_oop(p); |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
4894 } |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
4895 } |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
4896 } |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
4897 } |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
4898 }; |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
4899 |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
4900 // Serial drain queue closure. Called as the 'complete_gc' |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
4901 // closure for each discovered list in some of the |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
4902 // reference processing phases. |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
4903 |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
4904 class G1STWDrainQueueClosure: public VoidClosure { |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
4905 protected: |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
4906 G1CollectedHeap* _g1h; |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
4907 G1ParScanThreadState* _par_scan_state; |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
4908 |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
4909 G1ParScanThreadState* par_scan_state() { return _par_scan_state; } |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
4910 |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
4911 public: |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
4912 G1STWDrainQueueClosure(G1CollectedHeap* g1h, G1ParScanThreadState* pss) : |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
4913 _g1h(g1h), |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
4914 _par_scan_state(pss) |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
4915 { } |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
4916 |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
4917 void do_void() { |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
4918 G1ParScanThreadState* const pss = par_scan_state(); |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
4919 pss->trim_queue(); |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
4920 } |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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
johnc
parents:
3973
diff
changeset
|
4923 // Parallel Reference Processing closures |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
4924 |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
4925 // Implementation of AbstractRefProcTaskExecutor for parallel reference |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
4926 // processing during G1 evacuation pauses. |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
4927 |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
4928 class G1STWRefProcTaskExecutor: public AbstractRefProcTaskExecutor { |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
4929 private: |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
4930 G1CollectedHeap* _g1h; |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
4931 RefToScanQueueSet* _queues; |
4095
bca17e38de00
6593758: RFE: Enhance GC ergonomics to dynamically choose ParallelGCThreads
jmasa
parents:
4090
diff
changeset
|
4932 FlexibleWorkGang* _workers; |
3979
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
4933 int _active_workers; |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
4934 |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
4935 public: |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
4936 G1STWRefProcTaskExecutor(G1CollectedHeap* g1h, |
4095
bca17e38de00
6593758: RFE: Enhance GC ergonomics to dynamically choose ParallelGCThreads
jmasa
parents:
4090
diff
changeset
|
4937 FlexibleWorkGang* workers, |
3979
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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parents:
3973
diff
changeset
|
4938 RefToScanQueueSet *task_queues, |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
4939 int n_workers) : |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
4940 _g1h(g1h), |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
4941 _queues(task_queues), |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
4942 _workers(workers), |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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parents:
3973
diff
changeset
|
4943 _active_workers(n_workers) |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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parents:
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|
4944 { |
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4945 assert(n_workers > 0, "shouldn't call this otherwise"); |
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4946 } |
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|
4947 |
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4948 // Executes the given task using concurrent marking worker threads. |
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|
4949 virtual void execute(ProcessTask& task); |
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|
4950 virtual void execute(EnqueueTask& task); |
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|
4951 }; |
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|
4952 |
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4953 // Gang task for possibly parallel reference processing |
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|
4954 |
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4955 class G1STWRefProcTaskProxy: public AbstractGangTask { |
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4956 typedef AbstractRefProcTaskExecutor::ProcessTask ProcessTask; |
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4957 ProcessTask& _proc_task; |
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4958 G1CollectedHeap* _g1h; |
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4959 RefToScanQueueSet *_task_queues; |
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4960 ParallelTaskTerminator* _terminator; |
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4961 |
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4962 public: |
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4963 G1STWRefProcTaskProxy(ProcessTask& proc_task, |
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4964 G1CollectedHeap* g1h, |
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4965 RefToScanQueueSet *task_queues, |
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4966 ParallelTaskTerminator* terminator) : |
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|
4967 AbstractGangTask("Process reference objects in parallel"), |
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|
4968 _proc_task(proc_task), |
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|
4969 _g1h(g1h), |
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|
4970 _task_queues(task_queues), |
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|
4971 _terminator(terminator) |
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|
4972 {} |
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4973 |
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4974 virtual void work(int i) { |
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4975 // The reference processing task executed by a single worker. |
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|
4976 ResourceMark rm; |
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4977 HandleMark hm; |
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4978 |
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4979 G1STWIsAliveClosure is_alive(_g1h); |
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4980 |
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4981 G1ParScanThreadState pss(_g1h, i); |
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|
4982 |
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4983 G1ParScanHeapEvacClosure scan_evac_cl(_g1h, &pss, NULL); |
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4984 G1ParScanHeapEvacFailureClosure evac_failure_cl(_g1h, &pss, NULL); |
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4985 G1ParScanPartialArrayClosure partial_scan_cl(_g1h, &pss, NULL); |
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4986 |
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4987 pss.set_evac_closure(&scan_evac_cl); |
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4988 pss.set_evac_failure_closure(&evac_failure_cl); |
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4989 pss.set_partial_scan_closure(&partial_scan_cl); |
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|
4990 |
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4991 G1ParScanExtRootClosure only_copy_non_heap_cl(_g1h, &pss, NULL); |
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4992 G1ParScanPermClosure only_copy_perm_cl(_g1h, &pss, NULL); |
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4993 |
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4994 G1ParScanAndMarkExtRootClosure copy_mark_non_heap_cl(_g1h, &pss, NULL); |
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4995 G1ParScanAndMarkPermClosure copy_mark_perm_cl(_g1h, &pss, NULL); |
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4996 |
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4997 OopClosure* copy_non_heap_cl = &only_copy_non_heap_cl; |
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4998 OopsInHeapRegionClosure* copy_perm_cl = &only_copy_perm_cl; |
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4999 |
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5000 if (_g1h->g1_policy()->during_initial_mark_pause()) { |
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5001 // We also need to mark copied objects. |
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|
5002 copy_non_heap_cl = ©_mark_non_heap_cl; |
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5003 copy_perm_cl = ©_mark_perm_cl; |
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|
5004 } |
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|
5005 |
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|
5006 // Keep alive closure. |
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|
5007 G1CopyingKeepAliveClosure keep_alive(_g1h, copy_non_heap_cl, copy_perm_cl, &pss); |
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|
5008 |
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|
5009 // Complete GC closure |
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|
5010 G1ParEvacuateFollowersClosure drain_queue(_g1h, &pss, _task_queues, _terminator); |
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|
5011 |
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|
5012 // Call the reference processing task's work routine. |
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|
5013 _proc_task.work(i, is_alive, keep_alive, drain_queue); |
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|
5014 |
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|
5015 // Note we cannot assert that the refs array is empty here as not all |
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|
5016 // of the processing tasks (specifically phase2 - pp2_work) execute |
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|
5017 // the complete_gc closure (which ordinarily would drain the queue) so |
4dfb2df418f2
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|
5018 // the queue may not be empty. |
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diff
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|
5019 } |
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|
5020 }; |
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|
5021 |
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|
5022 // Driver routine for parallel reference processing. |
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|
5023 // Creates an instance of the ref processing gang |
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|
5024 // task and has the worker threads execute it. |
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|
5025 void G1STWRefProcTaskExecutor::execute(ProcessTask& proc_task) { |
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|
5026 assert(_workers != NULL, "Need parallel worker threads."); |
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|
5027 |
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|
5028 ParallelTaskTerminator terminator(_active_workers, _queues); |
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|
5029 G1STWRefProcTaskProxy proc_task_proxy(proc_task, _g1h, _queues, &terminator); |
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|
5030 |
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|
5031 _g1h->set_par_threads(_active_workers); |
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|
5032 _workers->run_task(&proc_task_proxy); |
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|
5033 _g1h->set_par_threads(0); |
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|
5034 } |
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|
5035 |
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|
5036 // Gang task for parallel reference enqueueing. |
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|
5037 |
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|
5038 class G1STWRefEnqueueTaskProxy: public AbstractGangTask { |
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|
5039 typedef AbstractRefProcTaskExecutor::EnqueueTask EnqueueTask; |
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|
5040 EnqueueTask& _enq_task; |
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|
5041 |
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|
5042 public: |
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diff
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|
5043 G1STWRefEnqueueTaskProxy(EnqueueTask& enq_task) : |
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diff
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|
5044 AbstractGangTask("Enqueue reference objects in parallel"), |
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diff
changeset
|
5045 _enq_task(enq_task) |
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|
5046 { } |
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diff
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|
5047 |
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|
5048 virtual void work(int i) { |
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diff
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|
5049 _enq_task.work(i); |
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|
5050 } |
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|
5051 }; |
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|
5052 |
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|
5053 // Driver routine for parallel reference enqueing. |
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|
5054 // Creates an instance of the ref enqueueing gang |
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diff
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|
5055 // task and has the worker threads execute it. |
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|
5056 |
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|
5057 void G1STWRefProcTaskExecutor::execute(EnqueueTask& enq_task) { |
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diff
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|
5058 assert(_workers != NULL, "Need parallel worker threads."); |
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|
5059 |
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|
5060 G1STWRefEnqueueTaskProxy enq_task_proxy(enq_task); |
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|
5061 |
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|
5062 _g1h->set_par_threads(_active_workers); |
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|
5063 _workers->run_task(&enq_task_proxy); |
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|
5064 _g1h->set_par_threads(0); |
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|
5065 } |
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diff
changeset
|
5066 |
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diff
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|
5067 // End of weak reference support closures |
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|
5068 |
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|
5069 // Abstract task used to preserve (i.e. copy) any referent objects |
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|
5070 // that are in the collection set and are pointed to by reference |
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|
5071 // objects discovered by the CM ref processor. |
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diff
changeset
|
5072 |
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diff
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|
5073 class G1ParPreserveCMReferentsTask: public AbstractGangTask { |
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|
5074 protected: |
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diff
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|
5075 G1CollectedHeap* _g1h; |
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|
5076 RefToScanQueueSet *_queues; |
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changeset
|
5077 ParallelTaskTerminator _terminator; |
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diff
changeset
|
5078 int _n_workers; |
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diff
changeset
|
5079 |
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diff
changeset
|
5080 public: |
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diff
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|
5081 G1ParPreserveCMReferentsTask(G1CollectedHeap* g1h,int workers, RefToScanQueueSet *task_queues) : |
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changeset
|
5082 AbstractGangTask("ParPreserveCMReferents"), |
4dfb2df418f2
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diff
changeset
|
5083 _g1h(g1h), |
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diff
changeset
|
5084 _queues(task_queues), |
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diff
changeset
|
5085 _terminator(workers, _queues), |
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diff
changeset
|
5086 _n_workers(workers) |
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diff
changeset
|
5087 { } |
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diff
changeset
|
5088 |
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diff
changeset
|
5089 void work(int i) { |
4dfb2df418f2
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diff
changeset
|
5090 ResourceMark rm; |
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diff
changeset
|
5091 HandleMark hm; |
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diff
changeset
|
5092 |
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diff
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|
5093 G1ParScanThreadState pss(_g1h, i); |
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diff
changeset
|
5094 G1ParScanHeapEvacClosure scan_evac_cl(_g1h, &pss, NULL); |
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|
5095 G1ParScanHeapEvacFailureClosure evac_failure_cl(_g1h, &pss, NULL); |
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|
5096 G1ParScanPartialArrayClosure partial_scan_cl(_g1h, &pss, NULL); |
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changeset
|
5097 |
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diff
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|
5098 pss.set_evac_closure(&scan_evac_cl); |
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|
5099 pss.set_evac_failure_closure(&evac_failure_cl); |
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|
5100 pss.set_partial_scan_closure(&partial_scan_cl); |
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|
5101 |
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|
5102 assert(pss.refs()->is_empty(), "both queue and overflow should be empty"); |
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|
5103 |
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diff
changeset
|
5104 |
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|
5105 G1ParScanExtRootClosure only_copy_non_heap_cl(_g1h, &pss, NULL); |
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|
5106 G1ParScanPermClosure only_copy_perm_cl(_g1h, &pss, NULL); |
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|
5107 |
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|
5108 G1ParScanAndMarkExtRootClosure copy_mark_non_heap_cl(_g1h, &pss, NULL); |
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|
5109 G1ParScanAndMarkPermClosure copy_mark_perm_cl(_g1h, &pss, NULL); |
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|
5110 |
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|
5111 OopClosure* copy_non_heap_cl = &only_copy_non_heap_cl; |
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|
5112 OopsInHeapRegionClosure* copy_perm_cl = &only_copy_perm_cl; |
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|
5113 |
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diff
changeset
|
5114 if (_g1h->g1_policy()->during_initial_mark_pause()) { |
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diff
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|
5115 // We also need to mark copied objects. |
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diff
changeset
|
5116 copy_non_heap_cl = ©_mark_non_heap_cl; |
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|
5117 copy_perm_cl = ©_mark_perm_cl; |
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changeset
|
5118 } |
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diff
changeset
|
5119 |
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diff
changeset
|
5120 // Is alive closure |
4dfb2df418f2
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diff
changeset
|
5121 G1AlwaysAliveClosure always_alive(_g1h); |
4dfb2df418f2
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diff
changeset
|
5122 |
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diff
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|
5123 // Copying keep alive closure. Applied to referent objects that need |
4dfb2df418f2
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diff
changeset
|
5124 // to be copied. |
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diff
changeset
|
5125 G1CopyingKeepAliveClosure keep_alive(_g1h, copy_non_heap_cl, copy_perm_cl, &pss); |
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|
5126 |
4dfb2df418f2
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diff
changeset
|
5127 ReferenceProcessor* rp = _g1h->ref_processor_cm(); |
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diff
changeset
|
5128 |
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diff
changeset
|
5129 int limit = ReferenceProcessor::number_of_subclasses_of_ref() * rp->max_num_q(); |
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diff
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|
5130 int stride = MIN2(MAX2(_n_workers, 1), limit); |
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diff
changeset
|
5131 |
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diff
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|
5132 // limit is set using max_num_q() - which was set using ParallelGCThreads. |
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diff
changeset
|
5133 // So this must be true - but assert just in case someone decides to |
4dfb2df418f2
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parents:
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diff
changeset
|
5134 // change the worker ids. |
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diff
changeset
|
5135 assert(0 <= i && i < limit, "sanity"); |
4dfb2df418f2
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diff
changeset
|
5136 assert(!rp->discovery_is_atomic(), "check this code"); |
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diff
changeset
|
5137 |
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diff
changeset
|
5138 // Select discovered lists [i, i+stride, i+2*stride,...,limit) |
4dfb2df418f2
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parents:
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diff
changeset
|
5139 for (int idx = i; idx < limit; idx += stride) { |
4014
bf2d2b8b1726
7095243: Disambiguate ReferenceProcessor::_discoveredSoftRefs
johnc
parents:
4013
diff
changeset
|
5140 DiscoveredList& ref_list = rp->discovered_refs()[idx]; |
3979
4dfb2df418f2
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parents:
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diff
changeset
|
5141 |
4dfb2df418f2
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parents:
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diff
changeset
|
5142 DiscoveredListIterator iter(ref_list, &keep_alive, &always_alive); |
4dfb2df418f2
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parents:
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diff
changeset
|
5143 while (iter.has_next()) { |
4dfb2df418f2
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parents:
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diff
changeset
|
5144 // Since discovery is not atomic for the CM ref processor, we |
4dfb2df418f2
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parents:
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diff
changeset
|
5145 // can see some null referent objects. |
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parents:
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diff
changeset
|
5146 iter.load_ptrs(DEBUG_ONLY(true)); |
4dfb2df418f2
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parents:
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diff
changeset
|
5147 oop ref = iter.obj(); |
4dfb2df418f2
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parents:
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diff
changeset
|
5148 |
4dfb2df418f2
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parents:
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diff
changeset
|
5149 // This will filter nulls. |
4dfb2df418f2
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parents:
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diff
changeset
|
5150 if (iter.is_referent_alive()) { |
4dfb2df418f2
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parents:
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diff
changeset
|
5151 iter.make_referent_alive(); |
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parents:
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diff
changeset
|
5152 } |
4dfb2df418f2
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parents:
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diff
changeset
|
5153 iter.move_to_next(); |
4dfb2df418f2
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johnc
parents:
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diff
changeset
|
5154 } |
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parents:
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diff
changeset
|
5155 } |
4dfb2df418f2
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parents:
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diff
changeset
|
5156 |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
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diff
changeset
|
5157 // Drain the queue - which may cause stealing |
4dfb2df418f2
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parents:
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diff
changeset
|
5158 G1ParEvacuateFollowersClosure drain_queue(_g1h, &pss, _queues, &_terminator); |
4dfb2df418f2
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parents:
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diff
changeset
|
5159 drain_queue.do_void(); |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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parents:
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diff
changeset
|
5160 // Allocation buffers were retired at the end of G1ParEvacuateFollowersClosure |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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parents:
3973
diff
changeset
|
5161 assert(pss.refs()->is_empty(), "should be"); |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5162 } |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5163 }; |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5164 |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
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diff
changeset
|
5165 // Weak Reference processing during an evacuation pause (part 1). |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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parents:
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diff
changeset
|
5166 void G1CollectedHeap::process_discovered_references() { |
4dfb2df418f2
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parents:
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diff
changeset
|
5167 double ref_proc_start = os::elapsedTime(); |
4dfb2df418f2
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diff
changeset
|
5168 |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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diff
changeset
|
5169 ReferenceProcessor* rp = _ref_processor_stw; |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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diff
changeset
|
5170 assert(rp->discovery_enabled(), "should have been enabled"); |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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parents:
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diff
changeset
|
5171 |
4dfb2df418f2
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diff
changeset
|
5172 // Any reference objects, in the collection set, that were 'discovered' |
4dfb2df418f2
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diff
changeset
|
5173 // by the CM ref processor should have already been copied (either by |
4dfb2df418f2
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3973
diff
changeset
|
5174 // applying the external root copy closure to the discovered lists, or |
4dfb2df418f2
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diff
changeset
|
5175 // by following an RSet entry). |
4dfb2df418f2
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diff
changeset
|
5176 // |
4dfb2df418f2
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diff
changeset
|
5177 // But some of the referents, that are in the collection set, that these |
4dfb2df418f2
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diff
changeset
|
5178 // reference objects point to may not have been copied: the STW ref |
4dfb2df418f2
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diff
changeset
|
5179 // processor would have seen that the reference object had already |
4dfb2df418f2
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diff
changeset
|
5180 // been 'discovered' and would have skipped discovering the reference, |
4dfb2df418f2
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diff
changeset
|
5181 // but would not have treated the reference object as a regular oop. |
4dfb2df418f2
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diff
changeset
|
5182 // As a reult the copy closure would not have been applied to the |
4dfb2df418f2
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parents:
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diff
changeset
|
5183 // referent object. |
4dfb2df418f2
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parents:
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diff
changeset
|
5184 // |
4dfb2df418f2
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diff
changeset
|
5185 // We need to explicitly copy these referent objects - the references |
4dfb2df418f2
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parents:
3973
diff
changeset
|
5186 // will be processed at the end of remarking. |
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diff
changeset
|
5187 // |
4dfb2df418f2
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diff
changeset
|
5188 // We also need to do this copying before we process the reference |
4dfb2df418f2
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diff
changeset
|
5189 // objects discovered by the STW ref processor in case one of these |
4dfb2df418f2
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diff
changeset
|
5190 // referents points to another object which is also referenced by an |
4dfb2df418f2
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diff
changeset
|
5191 // object discovered by the STW ref processor. |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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diff
changeset
|
5192 |
4095
bca17e38de00
6593758: RFE: Enhance GC ergonomics to dynamically choose ParallelGCThreads
jmasa
parents:
4090
diff
changeset
|
5193 int active_workers = (G1CollectedHeap::use_parallel_gc_threads() ? |
bca17e38de00
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diff
changeset
|
5194 workers()->active_workers() : 1); |
bca17e38de00
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jmasa
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diff
changeset
|
5195 |
bca17e38de00
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parents:
4090
diff
changeset
|
5196 assert(active_workers == workers()->active_workers(), |
bca17e38de00
6593758: RFE: Enhance GC ergonomics to dynamically choose ParallelGCThreads
jmasa
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4090
diff
changeset
|
5197 "Need to reset active_workers"); |
bca17e38de00
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jmasa
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4090
diff
changeset
|
5198 set_par_threads(active_workers); |
bca17e38de00
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4090
diff
changeset
|
5199 G1ParPreserveCMReferentsTask keep_cm_referents(this, active_workers, _task_queues); |
3979
4dfb2df418f2
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parents:
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diff
changeset
|
5200 |
4dfb2df418f2
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parents:
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diff
changeset
|
5201 if (G1CollectedHeap::use_parallel_gc_threads()) { |
4dfb2df418f2
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diff
changeset
|
5202 workers()->run_task(&keep_cm_referents); |
4dfb2df418f2
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diff
changeset
|
5203 } else { |
4dfb2df418f2
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parents:
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diff
changeset
|
5204 keep_cm_referents.work(0); |
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changeset
|
5205 } |
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changeset
|
5206 |
4dfb2df418f2
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diff
changeset
|
5207 set_par_threads(0); |
4dfb2df418f2
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diff
changeset
|
5208 |
4dfb2df418f2
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parents:
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diff
changeset
|
5209 // Closure to test whether a referent is alive. |
4dfb2df418f2
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diff
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|
5210 G1STWIsAliveClosure is_alive(this); |
4dfb2df418f2
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changeset
|
5211 |
4dfb2df418f2
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parents:
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diff
changeset
|
5212 // Even when parallel reference processing is enabled, the processing |
4dfb2df418f2
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diff
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|
5213 // of JNI refs is serial and performed serially by the current thread |
4dfb2df418f2
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|
5214 // rather than by a worker. The following PSS will be used for processing |
4dfb2df418f2
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|
5215 // JNI refs. |
4dfb2df418f2
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diff
changeset
|
5216 |
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diff
changeset
|
5217 // Use only a single queue for this PSS. |
4dfb2df418f2
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diff
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|
5218 G1ParScanThreadState pss(this, 0); |
4dfb2df418f2
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changeset
|
5219 |
4dfb2df418f2
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diff
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|
5220 // We do not embed a reference processor in the copying/scanning |
4dfb2df418f2
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diff
changeset
|
5221 // closures while we're actually processing the discovered |
4dfb2df418f2
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parents:
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diff
changeset
|
5222 // reference objects. |
4dfb2df418f2
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diff
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|
5223 G1ParScanHeapEvacClosure scan_evac_cl(this, &pss, NULL); |
4dfb2df418f2
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|
5224 G1ParScanHeapEvacFailureClosure evac_failure_cl(this, &pss, NULL); |
4dfb2df418f2
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|
5225 G1ParScanPartialArrayClosure partial_scan_cl(this, &pss, NULL); |
4dfb2df418f2
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|
5226 |
4dfb2df418f2
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|
5227 pss.set_evac_closure(&scan_evac_cl); |
4dfb2df418f2
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|
5228 pss.set_evac_failure_closure(&evac_failure_cl); |
4dfb2df418f2
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|
5229 pss.set_partial_scan_closure(&partial_scan_cl); |
4dfb2df418f2
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|
5230 |
4dfb2df418f2
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|
5231 assert(pss.refs()->is_empty(), "pre-condition"); |
4dfb2df418f2
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|
5232 |
4dfb2df418f2
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|
5233 G1ParScanExtRootClosure only_copy_non_heap_cl(this, &pss, NULL); |
4dfb2df418f2
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|
5234 G1ParScanPermClosure only_copy_perm_cl(this, &pss, NULL); |
4dfb2df418f2
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|
5235 |
4dfb2df418f2
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diff
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|
5236 G1ParScanAndMarkExtRootClosure copy_mark_non_heap_cl(this, &pss, NULL); |
4dfb2df418f2
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|
5237 G1ParScanAndMarkPermClosure copy_mark_perm_cl(this, &pss, NULL); |
4dfb2df418f2
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|
5238 |
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|
5239 OopClosure* copy_non_heap_cl = &only_copy_non_heap_cl; |
4dfb2df418f2
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|
5240 OopsInHeapRegionClosure* copy_perm_cl = &only_copy_perm_cl; |
4dfb2df418f2
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|
5241 |
4dfb2df418f2
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diff
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|
5242 if (_g1h->g1_policy()->during_initial_mark_pause()) { |
4dfb2df418f2
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diff
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|
5243 // We also need to mark copied objects. |
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diff
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|
5244 copy_non_heap_cl = ©_mark_non_heap_cl; |
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|
5245 copy_perm_cl = ©_mark_perm_cl; |
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|
5246 } |
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parents:
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diff
changeset
|
5247 |
4dfb2df418f2
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diff
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|
5248 // Keep alive closure. |
4dfb2df418f2
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parents:
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diff
changeset
|
5249 G1CopyingKeepAliveClosure keep_alive(this, copy_non_heap_cl, copy_perm_cl, &pss); |
4dfb2df418f2
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diff
changeset
|
5250 |
4dfb2df418f2
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parents:
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diff
changeset
|
5251 // Serial Complete GC closure |
4dfb2df418f2
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parents:
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diff
changeset
|
5252 G1STWDrainQueueClosure drain_queue(this, &pss); |
4dfb2df418f2
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parents:
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diff
changeset
|
5253 |
4dfb2df418f2
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parents:
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diff
changeset
|
5254 // Setup the soft refs policy... |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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parents:
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diff
changeset
|
5255 rp->setup_policy(false); |
4dfb2df418f2
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parents:
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diff
changeset
|
5256 |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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parents:
3973
diff
changeset
|
5257 if (!rp->processing_is_mt()) { |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
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diff
changeset
|
5258 // Serial reference processing... |
4dfb2df418f2
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parents:
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diff
changeset
|
5259 rp->process_discovered_references(&is_alive, |
4dfb2df418f2
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parents:
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diff
changeset
|
5260 &keep_alive, |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
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diff
changeset
|
5261 &drain_queue, |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
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diff
changeset
|
5262 NULL); |
4dfb2df418f2
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johnc
parents:
3973
diff
changeset
|
5263 } else { |
4dfb2df418f2
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parents:
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diff
changeset
|
5264 // Parallel reference processing |
4dfb2df418f2
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parents:
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diff
changeset
|
5265 assert(rp->num_q() == active_workers, "sanity"); |
4dfb2df418f2
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parents:
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diff
changeset
|
5266 assert(active_workers <= rp->max_num_q(), "sanity"); |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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parents:
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diff
changeset
|
5267 |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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parents:
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diff
changeset
|
5268 G1STWRefProcTaskExecutor par_task_executor(this, workers(), _task_queues, active_workers); |
4dfb2df418f2
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parents:
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diff
changeset
|
5269 rp->process_discovered_references(&is_alive, &keep_alive, &drain_queue, &par_task_executor); |
4dfb2df418f2
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parents:
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diff
changeset
|
5270 } |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5271 |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5272 // We have completed copying any necessary live referent objects |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5273 // (that were not copied during the actual pause) so we can |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5274 // retire any active alloc buffers |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5275 pss.retire_alloc_buffers(); |
4dfb2df418f2
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parents:
3973
diff
changeset
|
5276 assert(pss.refs()->is_empty(), "both queue and overflow should be empty"); |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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parents:
3973
diff
changeset
|
5277 |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
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diff
changeset
|
5278 double ref_proc_time = os::elapsedTime() - ref_proc_start; |
4dfb2df418f2
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parents:
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diff
changeset
|
5279 g1_policy()->record_ref_proc_time(ref_proc_time * 1000.0); |
4dfb2df418f2
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parents:
3973
diff
changeset
|
5280 } |
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 // Weak Reference processing during an evacuation pause (part 2). |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5283 void G1CollectedHeap::enqueue_discovered_references() { |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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parents:
3973
diff
changeset
|
5284 double ref_enq_start = os::elapsedTime(); |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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parents:
3973
diff
changeset
|
5285 |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5286 ReferenceProcessor* rp = _ref_processor_stw; |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5287 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
|
5288 |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5289 // Now enqueue any remaining on the discovered lists on to |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5290 // the pending list. |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5291 if (!rp->processing_is_mt()) { |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5292 // Serial reference processing... |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5293 rp->enqueue_discovered_references(); |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5294 } else { |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5295 // Parallel reference enqueuing |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5296 |
4095
bca17e38de00
6593758: RFE: Enhance GC ergonomics to dynamically choose ParallelGCThreads
jmasa
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4090
diff
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|
5297 int active_workers = (ParallelGCThreads > 0 ? workers()->active_workers() : 1); |
bca17e38de00
6593758: RFE: Enhance GC ergonomics to dynamically choose ParallelGCThreads
jmasa
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4090
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|
5298 assert(active_workers == workers()->active_workers(), |
bca17e38de00
6593758: RFE: Enhance GC ergonomics to dynamically choose ParallelGCThreads
jmasa
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4090
diff
changeset
|
5299 "Need to reset active_workers"); |
3979
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5300 assert(rp->num_q() == active_workers, "sanity"); |
4dfb2df418f2
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parents:
3973
diff
changeset
|
5301 assert(active_workers <= rp->max_num_q(), "sanity"); |
4dfb2df418f2
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parents:
3973
diff
changeset
|
5302 |
4dfb2df418f2
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3973
diff
changeset
|
5303 G1STWRefProcTaskExecutor par_task_executor(this, workers(), _task_queues, active_workers); |
4dfb2df418f2
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diff
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|
5304 rp->enqueue_discovered_references(&par_task_executor); |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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parents:
3973
diff
changeset
|
5305 } |
4dfb2df418f2
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johnc
parents:
3973
diff
changeset
|
5306 |
4dfb2df418f2
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johnc
parents:
3973
diff
changeset
|
5307 rp->verify_no_references_recorded(); |
4dfb2df418f2
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3973
diff
changeset
|
5308 assert(!rp->discovery_enabled(), "should have been disabled"); |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5309 |
4dfb2df418f2
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parents:
3973
diff
changeset
|
5310 // FIXME |
4dfb2df418f2
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parents:
3973
diff
changeset
|
5311 // CM's reference processing also cleans up the string and symbol tables. |
4dfb2df418f2
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parents:
3973
diff
changeset
|
5312 // Should we do that here also? We could, but it is a serial operation |
4dfb2df418f2
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parents:
3973
diff
changeset
|
5313 // and could signicantly increase the pause time. |
4dfb2df418f2
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parents:
3973
diff
changeset
|
5314 |
4dfb2df418f2
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diff
changeset
|
5315 double ref_enq_time = os::elapsedTime() - ref_enq_start; |
4dfb2df418f2
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|
5316 g1_policy()->record_ref_enq_time(ref_enq_time * 1000.0); |
4dfb2df418f2
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|
5317 } |
4dfb2df418f2
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diff
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|
5318 |
342 | 5319 void G1CollectedHeap::evacuate_collection_set() { |
5320 set_evacuation_failed(false); | |
5321 | |
5322 g1_rem_set()->prepare_for_oops_into_collection_set_do(); | |
5323 concurrent_g1_refine()->set_use_cache(false); | |
889 | 5324 concurrent_g1_refine()->clear_hot_cache_claimed_index(); |
5325 | |
4095
bca17e38de00
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4090
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|
5326 int n_workers; |
bca17e38de00
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4090
diff
changeset
|
5327 if (G1CollectedHeap::use_parallel_gc_threads()) { |
bca17e38de00
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4090
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changeset
|
5328 n_workers = |
bca17e38de00
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jmasa
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4090
diff
changeset
|
5329 AdaptiveSizePolicy::calc_active_workers(workers()->total_workers(), |
bca17e38de00
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jmasa
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4090
diff
changeset
|
5330 workers()->active_workers(), |
bca17e38de00
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jmasa
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4090
diff
changeset
|
5331 Threads::number_of_non_daemon_threads()); |
bca17e38de00
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4090
diff
changeset
|
5332 assert(UseDynamicNumberOfGCThreads || |
bca17e38de00
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4090
diff
changeset
|
5333 n_workers == workers()->total_workers(), |
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4090
diff
changeset
|
5334 "If not dynamic should be using all the workers"); |
bca17e38de00
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diff
changeset
|
5335 set_par_threads(n_workers); |
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diff
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|
5336 } else { |
bca17e38de00
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jmasa
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4090
diff
changeset
|
5337 assert(n_par_threads() == 0, |
bca17e38de00
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4090
diff
changeset
|
5338 "Should be the original non-parallel value"); |
bca17e38de00
6593758: RFE: Enhance GC ergonomics to dynamically choose ParallelGCThreads
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|
5339 n_workers = 1; |
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|
5340 } |
bca17e38de00
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diff
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|
5341 workers()->set_active_workers(n_workers); |
bca17e38de00
6593758: RFE: Enhance GC ergonomics to dynamically choose ParallelGCThreads
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|
5342 |
bca17e38de00
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|
5343 G1ParTask g1_par_task(this, _task_queues); |
342 | 5344 |
5345 init_for_evac_failure(NULL); | |
5346 | |
5347 rem_set()->prepare_for_younger_refs_iterate(true); | |
616
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|
5348 |
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|
5349 assert(dirty_card_queue_set().completed_buffers_num() == 0, "Should be empty"); |
342 | 5350 double start_par = os::elapsedTime(); |
3979
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|
5351 |
1833
8b10f48633dc
6984287: Regularize how GC parallel workers are specified.
jmasa
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1755
diff
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|
5352 if (G1CollectedHeap::use_parallel_gc_threads()) { |
342 | 5353 // 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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|
5354 StrongRootsScope srs(this); |
1709 | 5355 if (ParallelGCVerbose) G1ParScanThreadState::print_termination_stats_hdr(); |
4095
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|
5356 // These tasks use ShareHeap::_process_strong_tasks |
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|
5357 assert(UseDynamicNumberOfGCThreads || |
bca17e38de00
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|
5358 workers()->active_workers() == workers()->total_workers(), |
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|
5359 "If not dynamic should be using all the workers"); |
342 | 5360 workers()->run_task(&g1_par_task); |
5361 } else { | |
989
148e5441d916
6863023: need non-perm oops in code cache for JSR 292
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|
5362 StrongRootsScope srs(this); |
342 | 5363 g1_par_task.work(0); |
5364 } | |
5365 | |
5366 double par_time = (os::elapsedTime() - start_par) * 1000.0; | |
5367 g1_policy()->record_par_time(par_time); | |
4095
bca17e38de00
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|
5368 |
342 | 5369 set_par_threads(0); |
1974
fd1d227ef1b9
6983204: G1: Nightly test nsk/regression/b4958615 failing with +ExplicitGCInvokesConcurrent
johnc
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diff
changeset
|
5370 |
3979
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|
5371 // Process any discovered reference objects - we have |
4dfb2df418f2
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|
5372 // to do this _before_ we retire the GC alloc regions |
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|
5373 // as we may have to copy some 'reachable' referent |
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|
5374 // objects (and their reachable sub-graphs) that were |
4dfb2df418f2
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|
5375 // not copied during the pause. |
4dfb2df418f2
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|
5376 process_discovered_references(); |
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|
5377 |
1974
fd1d227ef1b9
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diff
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|
5378 // Weak root processing. |
fd1d227ef1b9
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diff
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|
5379 // Note: when JSR 292 is enabled and code blobs can contain |
fd1d227ef1b9
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diff
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|
5380 // non-perm oops then we will need to process the code blobs |
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|
5381 // here too. |
342 | 5382 { |
3979
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|
5383 G1STWIsAliveClosure is_alive(this); |
342 | 5384 G1KeepAliveClosure keep_alive(this); |
5385 JNIHandles::weak_oops_do(&is_alive, &keep_alive); | |
5386 } | |
3979
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|
5387 |
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|
5388 release_gc_alloc_regions(); |
342 | 5389 g1_rem_set()->cleanup_after_oops_into_collection_set_do(); |
616
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|
5390 |
889 | 5391 concurrent_g1_refine()->clear_hot_cache(); |
342 | 5392 concurrent_g1_refine()->set_use_cache(true); |
5393 | |
5394 finalize_for_evac_failure(); | |
5395 | |
5396 // Must do this before removing self-forwarding pointers, which clears | |
5397 // the per-region evac-failure flags. | |
5398 concurrent_mark()->complete_marking_in_collection_set(); | |
5399 | |
5400 if (evacuation_failed()) { | |
5401 remove_self_forwarding_pointers(); | |
5402 if (PrintGCDetails) { | |
1719
b63010841f78
6975964: G1: print out a more descriptive message for evacuation failure when +PrintGCDetails is set
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diff
changeset
|
5403 gclog_or_tty->print(" (to-space overflow)"); |
342 | 5404 } else if (PrintGC) { |
5405 gclog_or_tty->print("--"); | |
5406 } | |
5407 } | |
5408 | |
3979
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|
5409 // Enqueue any remaining references remaining on the STW |
4dfb2df418f2
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diff
changeset
|
5410 // reference processor's discovered lists. We need to do |
4dfb2df418f2
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|
5411 // this after the card table is cleaned (and verified) as |
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|
5412 // the act of enqueuing entries on to the pending list |
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|
5413 // will log these updates (and dirty their associated |
4dfb2df418f2
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changeset
|
5414 // cards). We need these updates logged to update any |
4dfb2df418f2
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|
5415 // RSets. |
4dfb2df418f2
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|
5416 enqueue_discovered_references(); |
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|
5417 |
616
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|
5418 if (G1DeferredRSUpdate) { |
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|
5419 RedirtyLoggedCardTableEntryFastClosure redirty; |
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|
5420 dirty_card_queue_set().set_closure(&redirty); |
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|
5421 dirty_card_queue_set().apply_closure_to_all_completed_buffers(); |
1111 | 5422 |
5423 DirtyCardQueueSet& dcq = JavaThread::dirty_card_queue_set(); | |
5424 dcq.merge_bufferlists(&dirty_card_queue_set()); | |
616
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|
5425 assert(dirty_card_queue_set().completed_buffers_num() == 0, "All should be consumed"); |
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|
5426 } |
342 | 5427 COMPILER2_PRESENT(DerivedPointerTable::update_pointers()); |
5428 } | |
5429 | |
2173 | 5430 void G1CollectedHeap::free_region_if_empty(HeapRegion* hr, |
2152 | 5431 size_t* pre_used, |
5432 FreeRegionList* free_list, | |
4072 | 5433 OldRegionSet* old_proxy_set, |
2152 | 5434 HumongousRegionSet* humongous_proxy_set, |
2173 | 5435 HRRSCleanupTask* hrrs_cleanup_task, |
2152 | 5436 bool par) { |
5437 if (hr->used() > 0 && hr->max_live_bytes() == 0 && !hr->is_young()) { | |
5438 if (hr->isHumongous()) { | |
5439 assert(hr->startsHumongous(), "we should only see starts humongous"); | |
5440 free_humongous_region(hr, pre_used, free_list, humongous_proxy_set, par); | |
5441 } else { | |
4072 | 5442 _old_set.remove_with_proxy(hr, old_proxy_set); |
2152 | 5443 free_region(hr, pre_used, free_list, par); |
342 | 5444 } |
2173 | 5445 } else { |
5446 hr->rem_set()->do_cleanup_work(hrrs_cleanup_task); | |
342 | 5447 } |
5448 } | |
5449 | |
2152 | 5450 void G1CollectedHeap::free_region(HeapRegion* hr, |
5451 size_t* pre_used, | |
5452 FreeRegionList* free_list, | |
5453 bool par) { | |
5454 assert(!hr->isHumongous(), "this is only for non-humongous regions"); | |
5455 assert(!hr->is_empty(), "the region should not be empty"); | |
5456 assert(free_list != NULL, "pre-condition"); | |
5457 | |
5458 *pre_used += hr->used(); | |
5459 hr->hr_clear(par, true /* clear_space */); | |
2432
455328d90876
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|
5460 free_list->add_as_head(hr); |
2152 | 5461 } |
5462 | |
5463 void G1CollectedHeap::free_humongous_region(HeapRegion* hr, | |
5464 size_t* pre_used, | |
5465 FreeRegionList* free_list, | |
5466 HumongousRegionSet* humongous_proxy_set, | |
5467 bool par) { | |
5468 assert(hr->startsHumongous(), "this is only for starts humongous regions"); | |
5469 assert(free_list != NULL, "pre-condition"); | |
5470 assert(humongous_proxy_set != NULL, "pre-condition"); | |
5471 | |
5472 size_t hr_used = hr->used(); | |
5473 size_t hr_capacity = hr->capacity(); | |
5474 size_t hr_pre_used = 0; | |
5475 _humongous_set.remove_with_proxy(hr, humongous_proxy_set); | |
5476 hr->set_notHumongous(); | |
5477 free_region(hr, &hr_pre_used, free_list, par); | |
5478 | |
3766 | 5479 size_t i = hr->hrs_index() + 1; |
2152 | 5480 size_t num = 1; |
3766 | 5481 while (i < n_regions()) { |
5482 HeapRegion* curr_hr = region_at(i); | |
2152 | 5483 if (!curr_hr->continuesHumongous()) { |
5484 break; | |
5485 } | |
5486 curr_hr->set_notHumongous(); | |
5487 free_region(curr_hr, &hr_pre_used, free_list, par); | |
5488 num += 1; | |
5489 i += 1; | |
5490 } | |
5491 assert(hr_pre_used == hr_used, | |
5492 err_msg("hr_pre_used: "SIZE_FORMAT" and hr_used: "SIZE_FORMAT" " | |
5493 "should be the same", hr_pre_used, hr_used)); | |
5494 *pre_used += hr_pre_used; | |
5495 } | |
5496 | |
5497 void G1CollectedHeap::update_sets_after_freeing_regions(size_t pre_used, | |
5498 FreeRegionList* free_list, | |
4072 | 5499 OldRegionSet* old_proxy_set, |
2152 | 5500 HumongousRegionSet* humongous_proxy_set, |
5501 bool par) { | |
5502 if (pre_used > 0) { | |
5503 Mutex* lock = (par) ? ParGCRareEvent_lock : NULL; | |
342 | 5504 MutexLockerEx x(lock, Mutex::_no_safepoint_check_flag); |
2152 | 5505 assert(_summary_bytes_used >= pre_used, |
5506 err_msg("invariant: _summary_bytes_used: "SIZE_FORMAT" " | |
5507 "should be >= pre_used: "SIZE_FORMAT, | |
5508 _summary_bytes_used, pre_used)); | |
342 | 5509 _summary_bytes_used -= pre_used; |
2152 | 5510 } |
5511 if (free_list != NULL && !free_list->is_empty()) { | |
5512 MutexLockerEx x(FreeList_lock, Mutex::_no_safepoint_check_flag); | |
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|
5513 _free_list.add_as_head(free_list); |
2152 | 5514 } |
4072 | 5515 if (old_proxy_set != NULL && !old_proxy_set->is_empty()) { |
5516 MutexLockerEx x(OldSets_lock, Mutex::_no_safepoint_check_flag); | |
5517 _old_set.update_from_proxy(old_proxy_set); | |
5518 } | |
2152 | 5519 if (humongous_proxy_set != NULL && !humongous_proxy_set->is_empty()) { |
5520 MutexLockerEx x(OldSets_lock, Mutex::_no_safepoint_check_flag); | |
5521 _humongous_set.update_from_proxy(humongous_proxy_set); | |
342 | 5522 } |
5523 } | |
5524 | |
796
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6819065: G1: eliminate high serial card table clearing time
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|
5525 class G1ParCleanupCTTask : public AbstractGangTask { |
29e7d79232b9
6819065: G1: eliminate high serial card table clearing time
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diff
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|
5526 CardTableModRefBS* _ct_bs; |
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diff
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|
5527 G1CollectedHeap* _g1h; |
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|
5528 HeapRegion* volatile _su_head; |
796
29e7d79232b9
6819065: G1: eliminate high serial card table clearing time
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794
diff
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|
5529 public: |
29e7d79232b9
6819065: G1: eliminate high serial card table clearing time
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diff
changeset
|
5530 G1ParCleanupCTTask(CardTableModRefBS* ct_bs, |
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3824
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|
5531 G1CollectedHeap* g1h) : |
796
29e7d79232b9
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794
diff
changeset
|
5532 AbstractGangTask("G1 Par Cleanup CT Task"), |
3830
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3824
diff
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|
5533 _ct_bs(ct_bs), _g1h(g1h) { } |
796
29e7d79232b9
6819065: G1: eliminate high serial card table clearing time
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794
diff
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|
5534 |
29e7d79232b9
6819065: G1: eliminate high serial card table clearing time
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794
diff
changeset
|
5535 void work(int i) { |
29e7d79232b9
6819065: G1: eliminate high serial card table clearing time
apetrusenko
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794
diff
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|
5536 HeapRegion* r; |
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diff
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|
5537 while (r = _g1h->pop_dirty_cards_region()) { |
29e7d79232b9
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diff
changeset
|
5538 clear_cards(r); |
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diff
changeset
|
5539 } |
940
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|
5540 } |
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diff
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|
5541 |
796
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diff
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|
5542 void clear_cards(HeapRegion* r) { |
3830
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3824
diff
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|
5543 // Cards of the survivors should have already been dirtied. |
1394
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|
5544 if (!r->is_survivor()) { |
796
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diff
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|
5545 _ct_bs->clear(MemRegion(r->bottom(), r->end())); |
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|
5546 } |
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|
5547 } |
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|
5548 }; |
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|
5549 |
940
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|
5550 #ifndef PRODUCT |
8624da129f0b
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diff
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|
5551 class G1VerifyCardTableCleanup: public HeapRegionClosure { |
3317
063382f9b575
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|
5552 G1CollectedHeap* _g1h; |
940
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|
5553 CardTableModRefBS* _ct_bs; |
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|
5554 public: |
3317
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tonyp
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diff
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|
5555 G1VerifyCardTableCleanup(G1CollectedHeap* g1h, CardTableModRefBS* ct_bs) |
063382f9b575
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|
5556 : _g1h(g1h), _ct_bs(ct_bs) { } |
2433
abdfc822206f
7023069: G1: Introduce symmetric locking in the slow allocation path
tonyp
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2432
diff
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|
5557 virtual bool doHeapRegion(HeapRegion* r) { |
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|
5558 if (r->is_survivor()) { |
3317
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|
5559 _g1h->verify_dirty_region(r); |
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|
5560 } else { |
3317
063382f9b575
7035144: G1: nightly failure: Non-dirty cards in region that should be dirty (failures still exist...)
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parents:
3293
diff
changeset
|
5561 _g1h->verify_not_dirty_region(r); |
940
8624da129f0b
6841313: G1: dirty cards of survivor regions in parallel
apetrusenko
parents:
936
diff
changeset
|
5562 } |
8624da129f0b
6841313: G1: dirty cards of survivor regions in parallel
apetrusenko
parents:
936
diff
changeset
|
5563 return false; |
8624da129f0b
6841313: G1: dirty cards of survivor regions in parallel
apetrusenko
parents:
936
diff
changeset
|
5564 } |
8624da129f0b
6841313: G1: dirty cards of survivor regions in parallel
apetrusenko
parents:
936
diff
changeset
|
5565 }; |
2433
abdfc822206f
7023069: G1: Introduce symmetric locking in the slow allocation path
tonyp
parents:
2432
diff
changeset
|
5566 |
3317
063382f9b575
7035144: G1: nightly failure: Non-dirty cards in region that should be dirty (failures still exist...)
tonyp
parents:
3293
diff
changeset
|
5567 void G1CollectedHeap::verify_not_dirty_region(HeapRegion* hr) { |
063382f9b575
7035144: G1: nightly failure: Non-dirty cards in region that should be dirty (failures still exist...)
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changeset
|
5568 // All of the region should be clean. |
063382f9b575
7035144: G1: nightly failure: Non-dirty cards in region that should be dirty (failures still exist...)
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parents:
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diff
changeset
|
5569 CardTableModRefBS* ct_bs = (CardTableModRefBS*)barrier_set(); |
063382f9b575
7035144: G1: nightly failure: Non-dirty cards in region that should be dirty (failures still exist...)
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parents:
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diff
changeset
|
5570 MemRegion mr(hr->bottom(), hr->end()); |
063382f9b575
7035144: G1: nightly failure: Non-dirty cards in region that should be dirty (failures still exist...)
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parents:
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diff
changeset
|
5571 ct_bs->verify_not_dirty_region(mr); |
063382f9b575
7035144: G1: nightly failure: Non-dirty cards in region that should be dirty (failures still exist...)
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diff
changeset
|
5572 } |
063382f9b575
7035144: G1: nightly failure: Non-dirty cards in region that should be dirty (failures still exist...)
tonyp
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diff
changeset
|
5573 |
063382f9b575
7035144: G1: nightly failure: Non-dirty cards in region that should be dirty (failures still exist...)
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diff
changeset
|
5574 void G1CollectedHeap::verify_dirty_region(HeapRegion* hr) { |
063382f9b575
7035144: G1: nightly failure: Non-dirty cards in region that should be dirty (failures still exist...)
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diff
changeset
|
5575 // We cannot guarantee that [bottom(),end()] is dirty. Threads |
063382f9b575
7035144: G1: nightly failure: Non-dirty cards in region that should be dirty (failures still exist...)
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parents:
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diff
changeset
|
5576 // dirty allocated blocks as they allocate them. The thread that |
063382f9b575
7035144: G1: nightly failure: Non-dirty cards in region that should be dirty (failures still exist...)
tonyp
parents:
3293
diff
changeset
|
5577 // retires each region and replaces it with a new one will do a |
063382f9b575
7035144: G1: nightly failure: Non-dirty cards in region that should be dirty (failures still exist...)
tonyp
parents:
3293
diff
changeset
|
5578 // maximal allocation to fill in [pre_dummy_top(),end()] but will |
063382f9b575
7035144: G1: nightly failure: Non-dirty cards in region that should be dirty (failures still exist...)
tonyp
parents:
3293
diff
changeset
|
5579 // not dirty that area (one less thing to have to do while holding |
063382f9b575
7035144: G1: nightly failure: Non-dirty cards in region that should be dirty (failures still exist...)
tonyp
parents:
3293
diff
changeset
|
5580 // a lock). So we can only verify that [bottom(),pre_dummy_top()] |
063382f9b575
7035144: G1: nightly failure: Non-dirty cards in region that should be dirty (failures still exist...)
tonyp
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diff
changeset
|
5581 // is dirty. |
063382f9b575
7035144: G1: nightly failure: Non-dirty cards in region that should be dirty (failures still exist...)
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parents:
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changeset
|
5582 CardTableModRefBS* ct_bs = (CardTableModRefBS*) barrier_set(); |
063382f9b575
7035144: G1: nightly failure: Non-dirty cards in region that should be dirty (failures still exist...)
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|
5583 MemRegion mr(hr->bottom(), hr->pre_dummy_top()); |
063382f9b575
7035144: G1: nightly failure: Non-dirty cards in region that should be dirty (failures still exist...)
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changeset
|
5584 ct_bs->verify_dirty_region(mr); |
063382f9b575
7035144: G1: nightly failure: Non-dirty cards in region that should be dirty (failures still exist...)
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|
5585 } |
063382f9b575
7035144: G1: nightly failure: Non-dirty cards in region that should be dirty (failures still exist...)
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diff
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|
5586 |
2433
abdfc822206f
7023069: G1: Introduce symmetric locking in the slow allocation path
tonyp
parents:
2432
diff
changeset
|
5587 void G1CollectedHeap::verify_dirty_young_list(HeapRegion* head) { |
3317
063382f9b575
7035144: G1: nightly failure: Non-dirty cards in region that should be dirty (failures still exist...)
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parents:
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changeset
|
5588 CardTableModRefBS* ct_bs = (CardTableModRefBS*) barrier_set(); |
2433
abdfc822206f
7023069: G1: Introduce symmetric locking in the slow allocation path
tonyp
parents:
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diff
changeset
|
5589 for (HeapRegion* hr = head; hr != NULL; hr = hr->get_next_young_region()) { |
3317
063382f9b575
7035144: G1: nightly failure: Non-dirty cards in region that should be dirty (failures still exist...)
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parents:
3293
diff
changeset
|
5590 verify_dirty_region(hr); |
2433
abdfc822206f
7023069: G1: Introduce symmetric locking in the slow allocation path
tonyp
parents:
2432
diff
changeset
|
5591 } |
abdfc822206f
7023069: G1: Introduce symmetric locking in the slow allocation path
tonyp
parents:
2432
diff
changeset
|
5592 } |
abdfc822206f
7023069: G1: Introduce symmetric locking in the slow allocation path
tonyp
parents:
2432
diff
changeset
|
5593 |
abdfc822206f
7023069: G1: Introduce symmetric locking in the slow allocation path
tonyp
parents:
2432
diff
changeset
|
5594 void G1CollectedHeap::verify_dirty_young_regions() { |
abdfc822206f
7023069: G1: Introduce symmetric locking in the slow allocation path
tonyp
parents:
2432
diff
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|
5595 verify_dirty_young_list(_young_list->first_region()); |
abdfc822206f
7023069: G1: Introduce symmetric locking in the slow allocation path
tonyp
parents:
2432
diff
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|
5596 verify_dirty_young_list(_young_list->first_survivor_region()); |
abdfc822206f
7023069: G1: Introduce symmetric locking in the slow allocation path
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parents:
2432
diff
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|
5597 } |
940
8624da129f0b
6841313: G1: dirty cards of survivor regions in parallel
apetrusenko
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936
diff
changeset
|
5598 #endif |
8624da129f0b
6841313: G1: dirty cards of survivor regions in parallel
apetrusenko
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936
diff
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|
5599 |
342 | 5600 void G1CollectedHeap::cleanUpCardTable() { |
5601 CardTableModRefBS* ct_bs = (CardTableModRefBS*) (barrier_set()); | |
5602 double start = os::elapsedTime(); | |
5603 | |
4023 | 5604 { |
5605 // Iterate over the dirty cards region list. | |
5606 G1ParCleanupCTTask cleanup_task(ct_bs, this); | |
5607 | |
5608 if (ParallelGCThreads > 0) { | |
5609 set_par_threads(workers()->total_workers()); | |
5610 workers()->run_task(&cleanup_task); | |
5611 set_par_threads(0); | |
5612 } else { | |
5613 while (_dirty_cards_region_list) { | |
5614 HeapRegion* r = _dirty_cards_region_list; | |
5615 cleanup_task.clear_cards(r); | |
5616 _dirty_cards_region_list = r->get_next_dirty_cards_region(); | |
5617 if (_dirty_cards_region_list == r) { | |
5618 // The last region. | |
5619 _dirty_cards_region_list = NULL; | |
5620 } | |
5621 r->set_next_dirty_cards_region(NULL); | |
796
29e7d79232b9
6819065: G1: eliminate high serial card table clearing time
apetrusenko
parents:
794
diff
changeset
|
5622 } |
29e7d79232b9
6819065: G1: eliminate high serial card table clearing time
apetrusenko
parents:
794
diff
changeset
|
5623 } |
4023 | 5624 #ifndef PRODUCT |
5625 if (G1VerifyCTCleanup || VerifyAfterGC) { | |
5626 G1VerifyCardTableCleanup cleanup_verifier(this, ct_bs); | |
5627 heap_region_iterate(&cleanup_verifier); | |
5628 } | |
5629 #endif | |
940
8624da129f0b
6841313: G1: dirty cards of survivor regions in parallel
apetrusenko
parents:
936
diff
changeset
|
5630 } |
1394
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
5631 |
342 | 5632 double elapsed = os::elapsedTime() - start; |
3979
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5633 g1_policy()->record_clear_ct_time(elapsed * 1000.0); |
342 | 5634 } |
5635 | |
5636 void G1CollectedHeap::free_collection_set(HeapRegion* cs_head) { | |
2152 | 5637 size_t pre_used = 0; |
5638 FreeRegionList local_free_list("Local List for CSet Freeing"); | |
5639 | |
342 | 5640 double young_time_ms = 0.0; |
5641 double non_young_time_ms = 0.0; | |
5642 | |
1394
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
5643 // Since the collection set is a superset of the the young list, |
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
5644 // all we need to do to clear the young list is clear its |
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
5645 // head and length, and unlink any young regions in the code below |
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
5646 _young_list->clear(); |
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
5647 |
342 | 5648 G1CollectorPolicy* policy = g1_policy(); |
5649 | |
5650 double start_sec = os::elapsedTime(); | |
5651 bool non_young = true; | |
5652 | |
5653 HeapRegion* cur = cs_head; | |
5654 int age_bound = -1; | |
5655 size_t rs_lengths = 0; | |
5656 | |
5657 while (cur != NULL) { | |
2361 | 5658 assert(!is_on_master_free_list(cur), "sanity"); |
2152 | 5659 |
342 | 5660 if (non_young) { |
5661 if (cur->is_young()) { | |
5662 double end_sec = os::elapsedTime(); | |
5663 double elapsed_ms = (end_sec - start_sec) * 1000.0; | |
5664 non_young_time_ms += elapsed_ms; | |
5665 | |
5666 start_sec = os::elapsedTime(); | |
5667 non_young = false; | |
5668 } | |
5669 } else { | |
2152 | 5670 double end_sec = os::elapsedTime(); |
5671 double elapsed_ms = (end_sec - start_sec) * 1000.0; | |
5672 young_time_ms += elapsed_ms; | |
5673 | |
5674 start_sec = os::elapsedTime(); | |
5675 non_young = true; | |
342 | 5676 } |
5677 | |
5678 rs_lengths += cur->rem_set()->occupied(); | |
5679 | |
5680 HeapRegion* next = cur->next_in_collection_set(); | |
5681 assert(cur->in_collection_set(), "bad CS"); | |
5682 cur->set_next_in_collection_set(NULL); | |
5683 cur->set_in_collection_set(false); | |
5684 | |
5685 if (cur->is_young()) { | |
5686 int index = cur->young_index_in_cset(); | |
4090
a88de71c4e3a
7097002: G1: remove a lot of unused / redundant code from the G1CollectorPolicy class
tonyp
parents:
4073
diff
changeset
|
5687 assert(index != -1, "invariant"); |
a88de71c4e3a
7097002: G1: remove a lot of unused / redundant code from the G1CollectorPolicy class
tonyp
parents:
4073
diff
changeset
|
5688 assert((size_t) index < policy->young_cset_region_length(), "invariant"); |
342 | 5689 size_t words_survived = _surviving_young_words[index]; |
5690 cur->record_surv_words_in_group(words_survived); | |
1394
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
5691 |
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
5692 // At this point the we have 'popped' cur from the collection set |
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
5693 // (linked via next_in_collection_set()) but it is still in the |
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
5694 // young list (linked via next_young_region()). Clear the |
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
5695 // _next_young_region field. |
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
5696 cur->set_next_young_region(NULL); |
342 | 5697 } else { |
5698 int index = cur->young_index_in_cset(); | |
4090
a88de71c4e3a
7097002: G1: remove a lot of unused / redundant code from the G1CollectorPolicy class
tonyp
parents:
4073
diff
changeset
|
5699 assert(index == -1, "invariant"); |
342 | 5700 } |
5701 | |
5702 assert( (cur->is_young() && cur->young_index_in_cset() > -1) || | |
5703 (!cur->is_young() && cur->young_index_in_cset() == -1), | |
5704 "invariant" ); | |
5705 | |
5706 if (!cur->evacuation_failed()) { | |
5707 // And the region is empty. | |
2152 | 5708 assert(!cur->is_empty(), "Should not have empty regions in a CS."); |
5709 free_region(cur, &pre_used, &local_free_list, false /* par */); | |
342 | 5710 } else { |
5711 cur->uninstall_surv_rate_group(); | |
4090
a88de71c4e3a
7097002: G1: remove a lot of unused / redundant code from the G1CollectorPolicy class
tonyp
parents:
4073
diff
changeset
|
5712 if (cur->is_young()) { |
342 | 5713 cur->set_young_index_in_cset(-1); |
4090
a88de71c4e3a
7097002: G1: remove a lot of unused / redundant code from the G1CollectorPolicy class
tonyp
parents:
4073
diff
changeset
|
5714 } |
342 | 5715 cur->set_not_young(); |
5716 cur->set_evacuation_failed(false); | |
4072 | 5717 // The region is now considered to be old. |
5718 _old_set.add(cur); | |
342 | 5719 } |
5720 cur = next; | |
5721 } | |
5722 | |
5723 policy->record_max_rs_lengths(rs_lengths); | |
5724 policy->cset_regions_freed(); | |
5725 | |
5726 double end_sec = os::elapsedTime(); | |
5727 double elapsed_ms = (end_sec - start_sec) * 1000.0; | |
5728 if (non_young) | |
5729 non_young_time_ms += elapsed_ms; | |
5730 else | |
5731 young_time_ms += elapsed_ms; | |
5732 | |
2152 | 5733 update_sets_after_freeing_regions(pre_used, &local_free_list, |
4072 | 5734 NULL /* old_proxy_set */, |
2152 | 5735 NULL /* humongous_proxy_set */, |
5736 false /* par */); | |
342 | 5737 policy->record_young_free_cset_time_ms(young_time_ms); |
5738 policy->record_non_young_free_cset_time_ms(non_young_time_ms); | |
5739 } | |
5740 | |
1394
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
5741 // This routine is similar to the above but does not record |
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
5742 // any policy statistics or update free lists; we are abandoning |
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
5743 // the current incremental collection set in preparation of a |
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
5744 // full collection. After the full GC we will start to build up |
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
5745 // the incremental collection set again. |
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
5746 // This is only called when we're doing a full collection |
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
5747 // and is immediately followed by the tearing down of the young list. |
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
5748 |
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
5749 void G1CollectedHeap::abandon_collection_set(HeapRegion* cs_head) { |
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
5750 HeapRegion* cur = cs_head; |
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
5751 |
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
5752 while (cur != NULL) { |
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
5753 HeapRegion* next = cur->next_in_collection_set(); |
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
5754 assert(cur->in_collection_set(), "bad CS"); |
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
5755 cur->set_next_in_collection_set(NULL); |
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
5756 cur->set_in_collection_set(false); |
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
5757 cur->set_young_index_in_cset(-1); |
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
5758 cur = next; |
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
5759 } |
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
5760 } |
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
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1391
diff
changeset
|
5761 |
2152 | 5762 void G1CollectedHeap::set_free_regions_coming() { |
5763 if (G1ConcRegionFreeingVerbose) { | |
5764 gclog_or_tty->print_cr("G1ConcRegionFreeing [cm thread] : " | |
5765 "setting free regions coming"); | |
5766 } | |
5767 | |
5768 assert(!free_regions_coming(), "pre-condition"); | |
5769 _free_regions_coming = true; | |
342 | 5770 } |
5771 | |
2152 | 5772 void G1CollectedHeap::reset_free_regions_coming() { |
5773 { | |
5774 assert(free_regions_coming(), "pre-condition"); | |
5775 MutexLockerEx x(SecondaryFreeList_lock, Mutex::_no_safepoint_check_flag); | |
5776 _free_regions_coming = false; | |
5777 SecondaryFreeList_lock->notify_all(); | |
5778 } | |
5779 | |
5780 if (G1ConcRegionFreeingVerbose) { | |
5781 gclog_or_tty->print_cr("G1ConcRegionFreeing [cm thread] : " | |
5782 "reset free regions coming"); | |
342 | 5783 } |
5784 } | |
5785 | |
2152 | 5786 void G1CollectedHeap::wait_while_free_regions_coming() { |
5787 // Most of the time we won't have to wait, so let's do a quick test | |
5788 // first before we take the lock. | |
5789 if (!free_regions_coming()) { | |
5790 return; | |
5791 } | |
5792 | |
5793 if (G1ConcRegionFreeingVerbose) { | |
5794 gclog_or_tty->print_cr("G1ConcRegionFreeing [other] : " | |
5795 "waiting for free regions"); | |
342 | 5796 } |
5797 | |
5798 { | |
2152 | 5799 MutexLockerEx x(SecondaryFreeList_lock, Mutex::_no_safepoint_check_flag); |
5800 while (free_regions_coming()) { | |
5801 SecondaryFreeList_lock->wait(Mutex::_no_safepoint_check_flag); | |
342 | 5802 } |
2152 | 5803 } |
5804 | |
5805 if (G1ConcRegionFreeingVerbose) { | |
5806 gclog_or_tty->print_cr("G1ConcRegionFreeing [other] : " | |
5807 "done waiting for free regions"); | |
5808 } | |
342 | 5809 } |
5810 | |
5811 void G1CollectedHeap::set_region_short_lived_locked(HeapRegion* hr) { | |
5812 assert(heap_lock_held_for_gc(), | |
5813 "the heap lock should already be held by or for this thread"); | |
5814 _young_list->push_region(hr); | |
5815 } | |
5816 | |
5817 class NoYoungRegionsClosure: public HeapRegionClosure { | |
5818 private: | |
5819 bool _success; | |
5820 public: | |
5821 NoYoungRegionsClosure() : _success(true) { } | |
5822 bool doHeapRegion(HeapRegion* r) { | |
5823 if (r->is_young()) { | |
5824 gclog_or_tty->print_cr("Region ["PTR_FORMAT", "PTR_FORMAT") tagged as young", | |
5825 r->bottom(), r->end()); | |
5826 _success = false; | |
5827 } | |
5828 return false; | |
5829 } | |
5830 bool success() { return _success; } | |
5831 }; | |
5832 | |
1394
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
5833 bool G1CollectedHeap::check_young_list_empty(bool check_heap, bool check_sample) { |
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
5834 bool ret = _young_list->check_list_empty(check_sample); |
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
5835 |
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
5836 if (check_heap) { |
342 | 5837 NoYoungRegionsClosure closure; |
5838 heap_region_iterate(&closure); | |
5839 ret = ret && closure.success(); | |
5840 } | |
5841 | |
5842 return ret; | |
5843 } | |
5844 | |
4072 | 5845 class TearDownRegionSetsClosure : public HeapRegionClosure { |
5846 private: | |
5847 OldRegionSet *_old_set; | |
2152 | 5848 |
342 | 5849 public: |
4072 | 5850 TearDownRegionSetsClosure(OldRegionSet* old_set) : _old_set(old_set) { } |
2152 | 5851 |
342 | 5852 bool doHeapRegion(HeapRegion* r) { |
4072 | 5853 if (r->is_empty()) { |
5854 // We ignore empty regions, we'll empty the free list afterwards | |
5855 } else if (r->is_young()) { | |
5856 // We ignore young regions, we'll empty the young list afterwards | |
5857 } else if (r->isHumongous()) { | |
5858 // We ignore humongous regions, we're not tearing down the | |
5859 // humongous region set | |
342 | 5860 } else { |
4072 | 5861 // The rest should be old |
5862 _old_set->remove(r); | |
342 | 5863 } |
5864 return false; | |
5865 } | |
5866 | |
4072 | 5867 ~TearDownRegionSetsClosure() { |
5868 assert(_old_set->is_empty(), "post-condition"); | |
2152 | 5869 } |
342 | 5870 }; |
5871 | |
4072 | 5872 void G1CollectedHeap::tear_down_region_sets(bool free_list_only) { |
5873 assert_at_safepoint(true /* should_be_vm_thread */); | |
5874 | |
5875 if (!free_list_only) { | |
5876 TearDownRegionSetsClosure cl(&_old_set); | |
5877 heap_region_iterate(&cl); | |
5878 | |
5879 // Need to do this after the heap iteration to be able to | |
5880 // recognize the young regions and ignore them during the iteration. | |
5881 _young_list->empty_list(); | |
5882 } | |
5883 _free_list.remove_all(); | |
5884 } | |
5885 | |
5886 class RebuildRegionSetsClosure : public HeapRegionClosure { | |
5887 private: | |
5888 bool _free_list_only; | |
5889 OldRegionSet* _old_set; | |
5890 FreeRegionList* _free_list; | |
5891 size_t _total_used; | |
5892 | |
5893 public: | |
5894 RebuildRegionSetsClosure(bool free_list_only, | |
5895 OldRegionSet* old_set, FreeRegionList* free_list) : | |
5896 _free_list_only(free_list_only), | |
5897 _old_set(old_set), _free_list(free_list), _total_used(0) { | |
5898 assert(_free_list->is_empty(), "pre-condition"); | |
5899 if (!free_list_only) { | |
5900 assert(_old_set->is_empty(), "pre-condition"); | |
5901 } | |
5902 } | |
5903 | |
5904 bool doHeapRegion(HeapRegion* r) { | |
5905 if (r->continuesHumongous()) { | |
5906 return false; | |
5907 } | |
5908 | |
5909 if (r->is_empty()) { | |
5910 // Add free regions to the free list | |
5911 _free_list->add_as_tail(r); | |
5912 } else if (!_free_list_only) { | |
5913 assert(!r->is_young(), "we should not come across young regions"); | |
5914 | |
5915 if (r->isHumongous()) { | |
5916 // We ignore humongous regions, we left the humongous set unchanged | |
5917 } else { | |
5918 // The rest should be old, add them to the old set | |
5919 _old_set->add(r); | |
5920 } | |
5921 _total_used += r->used(); | |
5922 } | |
5923 | |
5924 return false; | |
5925 } | |
5926 | |
5927 size_t total_used() { | |
5928 return _total_used; | |
5929 } | |
5930 }; | |
5931 | |
5932 void G1CollectedHeap::rebuild_region_sets(bool free_list_only) { | |
5933 assert_at_safepoint(true /* should_be_vm_thread */); | |
5934 | |
5935 RebuildRegionSetsClosure cl(free_list_only, &_old_set, &_free_list); | |
5936 heap_region_iterate(&cl); | |
5937 | |
5938 if (!free_list_only) { | |
5939 _summary_bytes_used = cl.total_used(); | |
5940 } | |
5941 assert(_summary_bytes_used == recalculate_used(), | |
5942 err_msg("inconsistent _summary_bytes_used, " | |
5943 "value: "SIZE_FORMAT" recalculated: "SIZE_FORMAT, | |
5944 _summary_bytes_used, recalculate_used())); | |
342 | 5945 } |
5946 | |
5947 void G1CollectedHeap::set_refine_cte_cl_concurrency(bool concurrent) { | |
5948 _refine_cte_cl->set_concurrent(concurrent); | |
5949 } | |
5950 | |
5951 bool G1CollectedHeap::is_in_closed_subset(const void* p) const { | |
5952 HeapRegion* hr = heap_region_containing(p); | |
5953 if (hr == NULL) { | |
5954 return is_in_permanent(p); | |
5955 } else { | |
5956 return hr->is_in(p); | |
5957 } | |
5958 } | |
2152 | 5959 |
3830
f44782f04dd4
7039627: G1: avoid BOT updates for survivor allocations and dirty survivor regions incrementally
tonyp
parents:
3824
diff
changeset
|
5960 // Methods for the mutator alloc region |
f44782f04dd4
7039627: G1: avoid BOT updates for survivor allocations and dirty survivor regions incrementally
tonyp
parents:
3824
diff
changeset
|
5961 |
2433
abdfc822206f
7023069: G1: Introduce symmetric locking in the slow allocation path
tonyp
parents:
2432
diff
changeset
|
5962 HeapRegion* G1CollectedHeap::new_mutator_alloc_region(size_t word_size, |
abdfc822206f
7023069: G1: Introduce symmetric locking in the slow allocation path
tonyp
parents:
2432
diff
changeset
|
5963 bool force) { |
abdfc822206f
7023069: G1: Introduce symmetric locking in the slow allocation path
tonyp
parents:
2432
diff
changeset
|
5964 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
|
5965 assert(!force || g1_policy()->can_expand_young_list(), |
abdfc822206f
7023069: G1: Introduce symmetric locking in the slow allocation path
tonyp
parents:
2432
diff
changeset
|
5966 "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
|
5967 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
|
5968 if (force || !young_list_full) { |
2433
abdfc822206f
7023069: G1: Introduce symmetric locking in the slow allocation path
tonyp
parents:
2432
diff
changeset
|
5969 HeapRegion* new_alloc_region = new_region(word_size, |
abdfc822206f
7023069: G1: Introduce symmetric locking in the slow allocation path
tonyp
parents:
2432
diff
changeset
|
5970 false /* do_expand */); |
abdfc822206f
7023069: G1: Introduce symmetric locking in the slow allocation path
tonyp
parents:
2432
diff
changeset
|
5971 if (new_alloc_region != NULL) { |
abdfc822206f
7023069: G1: Introduce symmetric locking in the slow allocation path
tonyp
parents:
2432
diff
changeset
|
5972 set_region_short_lived_locked(new_alloc_region); |
3778
5f6f2615433a
7049999: G1: Make the G1PrintHeapRegions output consistent and complete
tonyp
parents:
3777
diff
changeset
|
5973 _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
|
5974 return new_alloc_region; |
abdfc822206f
7023069: G1: Introduce symmetric locking in the slow allocation path
tonyp
parents:
2432
diff
changeset
|
5975 } |
abdfc822206f
7023069: G1: Introduce symmetric locking in the slow allocation path
tonyp
parents:
2432
diff
changeset
|
5976 } |
abdfc822206f
7023069: G1: Introduce symmetric locking in the slow allocation path
tonyp
parents:
2432
diff
changeset
|
5977 return NULL; |
abdfc822206f
7023069: G1: Introduce symmetric locking in the slow allocation path
tonyp
parents:
2432
diff
changeset
|
5978 } |
abdfc822206f
7023069: G1: Introduce symmetric locking in the slow allocation path
tonyp
parents:
2432
diff
changeset
|
5979 |
abdfc822206f
7023069: G1: Introduce symmetric locking in the slow allocation path
tonyp
parents:
2432
diff
changeset
|
5980 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
|
5981 size_t allocated_bytes) { |
abdfc822206f
7023069: G1: Introduce symmetric locking in the slow allocation path
tonyp
parents:
2432
diff
changeset
|
5982 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
|
5983 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
|
5984 |
abdfc822206f
7023069: G1: Introduce symmetric locking in the slow allocation path
tonyp
parents:
2432
diff
changeset
|
5985 g1_policy()->add_region_to_incremental_cset_lhs(alloc_region); |
abdfc822206f
7023069: G1: Introduce symmetric locking in the slow allocation path
tonyp
parents:
2432
diff
changeset
|
5986 _summary_bytes_used += allocated_bytes; |
3778
5f6f2615433a
7049999: G1: Make the G1PrintHeapRegions output consistent and complete
tonyp
parents:
3777
diff
changeset
|
5987 _hr_printer.retire(alloc_region); |
3980
8229bd737950
7075646: G1: fix inconsistencies in the monitoring data
tonyp
parents:
3979
diff
changeset
|
5988 // 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
|
5989 // 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
|
5990 // used space has been recored in _summary_bytes_used. |
8229bd737950
7075646: G1: fix inconsistencies in the monitoring data
tonyp
parents:
3979
diff
changeset
|
5991 g1mm()->update_eden_size(); |
2433
abdfc822206f
7023069: G1: Introduce symmetric locking in the slow allocation path
tonyp
parents:
2432
diff
changeset
|
5992 } |
abdfc822206f
7023069: G1: Introduce symmetric locking in the slow allocation path
tonyp
parents:
2432
diff
changeset
|
5993 |
abdfc822206f
7023069: G1: Introduce symmetric locking in the slow allocation path
tonyp
parents:
2432
diff
changeset
|
5994 HeapRegion* MutatorAllocRegion::allocate_new_region(size_t word_size, |
abdfc822206f
7023069: G1: Introduce symmetric locking in the slow allocation path
tonyp
parents:
2432
diff
changeset
|
5995 bool force) { |
abdfc822206f
7023069: G1: Introduce symmetric locking in the slow allocation path
tonyp
parents:
2432
diff
changeset
|
5996 return _g1h->new_mutator_alloc_region(word_size, force); |
abdfc822206f
7023069: G1: Introduce symmetric locking in the slow allocation path
tonyp
parents:
2432
diff
changeset
|
5997 } |
abdfc822206f
7023069: G1: Introduce symmetric locking in the slow allocation path
tonyp
parents:
2432
diff
changeset
|
5998 |
4095
bca17e38de00
6593758: RFE: Enhance GC ergonomics to dynamically choose ParallelGCThreads
jmasa
parents:
4090
diff
changeset
|
5999 void G1CollectedHeap::set_par_threads() { |
bca17e38de00
6593758: RFE: Enhance GC ergonomics to dynamically choose ParallelGCThreads
jmasa
parents:
4090
diff
changeset
|
6000 // Don't change the number of workers. Use the value previously set |
bca17e38de00
6593758: RFE: Enhance GC ergonomics to dynamically choose ParallelGCThreads
jmasa
parents:
4090
diff
changeset
|
6001 // in the workgroup. |
bca17e38de00
6593758: RFE: Enhance GC ergonomics to dynamically choose ParallelGCThreads
jmasa
parents:
4090
diff
changeset
|
6002 int n_workers = workers()->active_workers(); |
bca17e38de00
6593758: RFE: Enhance GC ergonomics to dynamically choose ParallelGCThreads
jmasa
parents:
4090
diff
changeset
|
6003 assert(UseDynamicNumberOfGCThreads || |
bca17e38de00
6593758: RFE: Enhance GC ergonomics to dynamically choose ParallelGCThreads
jmasa
parents:
4090
diff
changeset
|
6004 n_workers == workers()->total_workers(), |
bca17e38de00
6593758: RFE: Enhance GC ergonomics to dynamically choose ParallelGCThreads
jmasa
parents:
4090
diff
changeset
|
6005 "Otherwise should be using the total number of workers"); |
bca17e38de00
6593758: RFE: Enhance GC ergonomics to dynamically choose ParallelGCThreads
jmasa
parents:
4090
diff
changeset
|
6006 if (n_workers == 0) { |
bca17e38de00
6593758: RFE: Enhance GC ergonomics to dynamically choose ParallelGCThreads
jmasa
parents:
4090
diff
changeset
|
6007 assert(false, "Should have been set in prior evacuation pause."); |
bca17e38de00
6593758: RFE: Enhance GC ergonomics to dynamically choose ParallelGCThreads
jmasa
parents:
4090
diff
changeset
|
6008 n_workers = ParallelGCThreads; |
bca17e38de00
6593758: RFE: Enhance GC ergonomics to dynamically choose ParallelGCThreads
jmasa
parents:
4090
diff
changeset
|
6009 workers()->set_active_workers(n_workers); |
bca17e38de00
6593758: RFE: Enhance GC ergonomics to dynamically choose ParallelGCThreads
jmasa
parents:
4090
diff
changeset
|
6010 } |
bca17e38de00
6593758: RFE: Enhance GC ergonomics to dynamically choose ParallelGCThreads
jmasa
parents:
4090
diff
changeset
|
6011 set_par_threads(n_workers); |
bca17e38de00
6593758: RFE: Enhance GC ergonomics to dynamically choose ParallelGCThreads
jmasa
parents:
4090
diff
changeset
|
6012 } |
bca17e38de00
6593758: RFE: Enhance GC ergonomics to dynamically choose ParallelGCThreads
jmasa
parents:
4090
diff
changeset
|
6013 |
2433
abdfc822206f
7023069: G1: Introduce symmetric locking in the slow allocation path
tonyp
parents:
2432
diff
changeset
|
6014 void MutatorAllocRegion::retire_region(HeapRegion* alloc_region, |
abdfc822206f
7023069: G1: Introduce symmetric locking in the slow allocation path
tonyp
parents:
2432
diff
changeset
|
6015 size_t allocated_bytes) { |
abdfc822206f
7023069: G1: Introduce symmetric locking in the slow allocation path
tonyp
parents:
2432
diff
changeset
|
6016 _g1h->retire_mutator_alloc_region(alloc_region, allocated_bytes); |
abdfc822206f
7023069: G1: Introduce symmetric locking in the slow allocation path
tonyp
parents:
2432
diff
changeset
|
6017 } |
abdfc822206f
7023069: G1: Introduce symmetric locking in the slow allocation path
tonyp
parents:
2432
diff
changeset
|
6018 |
3830
f44782f04dd4
7039627: G1: avoid BOT updates for survivor allocations and dirty survivor regions incrementally
tonyp
parents:
3824
diff
changeset
|
6019 // Methods for the GC alloc regions |
f44782f04dd4
7039627: G1: avoid BOT updates for survivor allocations and dirty survivor regions incrementally
tonyp
parents:
3824
diff
changeset
|
6020 |
f44782f04dd4
7039627: G1: avoid BOT updates for survivor allocations and dirty survivor regions incrementally
tonyp
parents:
3824
diff
changeset
|
6021 HeapRegion* G1CollectedHeap::new_gc_alloc_region(size_t word_size, |
f44782f04dd4
7039627: G1: avoid BOT updates for survivor allocations and dirty survivor regions incrementally
tonyp
parents:
3824
diff
changeset
|
6022 size_t count, |
f44782f04dd4
7039627: G1: avoid BOT updates for survivor allocations and dirty survivor regions incrementally
tonyp
parents:
3824
diff
changeset
|
6023 GCAllocPurpose ap) { |
f44782f04dd4
7039627: G1: avoid BOT updates for survivor allocations and dirty survivor regions incrementally
tonyp
parents:
3824
diff
changeset
|
6024 assert(FreeList_lock->owned_by_self(), "pre-condition"); |
f44782f04dd4
7039627: G1: avoid BOT updates for survivor allocations and dirty survivor regions incrementally
tonyp
parents:
3824
diff
changeset
|
6025 |
f44782f04dd4
7039627: G1: avoid BOT updates for survivor allocations and dirty survivor regions incrementally
tonyp
parents:
3824
diff
changeset
|
6026 if (count < g1_policy()->max_regions(ap)) { |
f44782f04dd4
7039627: G1: avoid BOT updates for survivor allocations and dirty survivor regions incrementally
tonyp
parents:
3824
diff
changeset
|
6027 HeapRegion* new_alloc_region = new_region(word_size, |
f44782f04dd4
7039627: G1: avoid BOT updates for survivor allocations and dirty survivor regions incrementally
tonyp
parents:
3824
diff
changeset
|
6028 true /* do_expand */); |
f44782f04dd4
7039627: G1: avoid BOT updates for survivor allocations and dirty survivor regions incrementally
tonyp
parents:
3824
diff
changeset
|
6029 if (new_alloc_region != NULL) { |
f44782f04dd4
7039627: G1: avoid BOT updates for survivor allocations and dirty survivor regions incrementally
tonyp
parents:
3824
diff
changeset
|
6030 // We really only need to do this for old regions given that we |
f44782f04dd4
7039627: G1: avoid BOT updates for survivor allocations and dirty survivor regions incrementally
tonyp
parents:
3824
diff
changeset
|
6031 // should never scan survivors. But it doesn't hurt to do it |
f44782f04dd4
7039627: G1: avoid BOT updates for survivor allocations and dirty survivor regions incrementally
tonyp
parents:
3824
diff
changeset
|
6032 // for survivors too. |
f44782f04dd4
7039627: G1: avoid BOT updates for survivor allocations and dirty survivor regions incrementally
tonyp
parents:
3824
diff
changeset
|
6033 new_alloc_region->set_saved_mark(); |
f44782f04dd4
7039627: G1: avoid BOT updates for survivor allocations and dirty survivor regions incrementally
tonyp
parents:
3824
diff
changeset
|
6034 if (ap == GCAllocForSurvived) { |
f44782f04dd4
7039627: G1: avoid BOT updates for survivor allocations and dirty survivor regions incrementally
tonyp
parents:
3824
diff
changeset
|
6035 new_alloc_region->set_survivor(); |
f44782f04dd4
7039627: G1: avoid BOT updates for survivor allocations and dirty survivor regions incrementally
tonyp
parents:
3824
diff
changeset
|
6036 _hr_printer.alloc(new_alloc_region, G1HRPrinter::Survivor); |
f44782f04dd4
7039627: G1: avoid BOT updates for survivor allocations and dirty survivor regions incrementally
tonyp
parents:
3824
diff
changeset
|
6037 } else { |
f44782f04dd4
7039627: G1: avoid BOT updates for survivor allocations and dirty survivor regions incrementally
tonyp
parents:
3824
diff
changeset
|
6038 _hr_printer.alloc(new_alloc_region, G1HRPrinter::Old); |
f44782f04dd4
7039627: G1: avoid BOT updates for survivor allocations and dirty survivor regions incrementally
tonyp
parents:
3824
diff
changeset
|
6039 } |
f44782f04dd4
7039627: G1: avoid BOT updates for survivor allocations and dirty survivor regions incrementally
tonyp
parents:
3824
diff
changeset
|
6040 return new_alloc_region; |
f44782f04dd4
7039627: G1: avoid BOT updates for survivor allocations and dirty survivor regions incrementally
tonyp
parents:
3824
diff
changeset
|
6041 } else { |
f44782f04dd4
7039627: G1: avoid BOT updates for survivor allocations and dirty survivor regions incrementally
tonyp
parents:
3824
diff
changeset
|
6042 g1_policy()->note_alloc_region_limit_reached(ap); |
f44782f04dd4
7039627: G1: avoid BOT updates for survivor allocations and dirty survivor regions incrementally
tonyp
parents:
3824
diff
changeset
|
6043 } |
f44782f04dd4
7039627: G1: avoid BOT updates for survivor allocations and dirty survivor regions incrementally
tonyp
parents:
3824
diff
changeset
|
6044 } |
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6045 return NULL; |
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6046 } |
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6047 |
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6048 void G1CollectedHeap::retire_gc_alloc_region(HeapRegion* alloc_region, |
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6049 size_t allocated_bytes, |
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6050 GCAllocPurpose ap) { |
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6051 alloc_region->note_end_of_copying(); |
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6052 g1_policy()->record_bytes_copied_during_gc(allocated_bytes); |
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6053 if (ap == GCAllocForSurvived) { |
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6054 young_list()->add_survivor_region(alloc_region); |
4072 | 6055 } else { |
6056 _old_set.add(alloc_region); | |
3830
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6057 } |
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6058 _hr_printer.retire(alloc_region); |
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6059 } |
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6060 |
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6061 HeapRegion* SurvivorGCAllocRegion::allocate_new_region(size_t word_size, |
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6062 bool force) { |
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6063 assert(!force, "not supported for GC alloc regions"); |
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6064 return _g1h->new_gc_alloc_region(word_size, count(), GCAllocForSurvived); |
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6065 } |
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6066 |
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6067 void SurvivorGCAllocRegion::retire_region(HeapRegion* alloc_region, |
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6068 size_t allocated_bytes) { |
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6069 _g1h->retire_gc_alloc_region(alloc_region, allocated_bytes, |
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6070 GCAllocForSurvived); |
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6071 } |
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6072 |
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6073 HeapRegion* OldGCAllocRegion::allocate_new_region(size_t word_size, |
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6074 bool force) { |
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6075 assert(!force, "not supported for GC alloc regions"); |
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6076 return _g1h->new_gc_alloc_region(word_size, count(), GCAllocForTenured); |
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6077 } |
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6078 |
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6079 void OldGCAllocRegion::retire_region(HeapRegion* alloc_region, |
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6080 size_t allocated_bytes) { |
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6081 _g1h->retire_gc_alloc_region(alloc_region, allocated_bytes, |
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6082 GCAllocForTenured); |
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6083 } |
2433
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6084 // Heap region set verification |
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6085 |
2152 | 6086 class VerifyRegionListsClosure : public HeapRegionClosure { |
6087 private: | |
4072 | 6088 FreeRegionList* _free_list; |
6089 OldRegionSet* _old_set; | |
2152 | 6090 HumongousRegionSet* _humongous_set; |
6091 size_t _region_count; | |
6092 | |
6093 public: | |
4072 | 6094 VerifyRegionListsClosure(OldRegionSet* old_set, |
6095 HumongousRegionSet* humongous_set, | |
2152 | 6096 FreeRegionList* free_list) : |
4072 | 6097 _old_set(old_set), _humongous_set(humongous_set), |
6098 _free_list(free_list), _region_count(0) { } | |
2152 | 6099 |
6100 size_t region_count() { return _region_count; } | |
6101 | |
6102 bool doHeapRegion(HeapRegion* hr) { | |
6103 _region_count += 1; | |
6104 | |
6105 if (hr->continuesHumongous()) { | |
6106 return false; | |
6107 } | |
6108 | |
6109 if (hr->is_young()) { | |
6110 // TODO | |
6111 } else if (hr->startsHumongous()) { | |
6112 _humongous_set->verify_next_region(hr); | |
6113 } else if (hr->is_empty()) { | |
6114 _free_list->verify_next_region(hr); | |
4072 | 6115 } else { |
6116 _old_set->verify_next_region(hr); | |
2152 | 6117 } |
6118 return false; | |
6119 } | |
6120 }; | |
6121 | |
3766 | 6122 HeapRegion* G1CollectedHeap::new_heap_region(size_t hrs_index, |
6123 HeapWord* bottom) { | |
6124 HeapWord* end = bottom + HeapRegion::GrainWords; | |
6125 MemRegion mr(bottom, end); | |
6126 assert(_g1_reserved.contains(mr), "invariant"); | |
6127 // This might return NULL if the allocation fails | |
6128 return new HeapRegion(hrs_index, _bot_shared, mr, true /* is_zeroed */); | |
6129 } | |
6130 | |
2152 | 6131 void G1CollectedHeap::verify_region_sets() { |
6132 assert_heap_locked_or_at_safepoint(true /* should_be_vm_thread */); | |
6133 | |
6134 // First, check the explicit lists. | |
6135 _free_list.verify(); | |
6136 { | |
6137 // Given that a concurrent operation might be adding regions to | |
6138 // the secondary free list we have to take the lock before | |
6139 // verifying it. | |
6140 MutexLockerEx x(SecondaryFreeList_lock, Mutex::_no_safepoint_check_flag); | |
6141 _secondary_free_list.verify(); | |
6142 } | |
4072 | 6143 _old_set.verify(); |
2152 | 6144 _humongous_set.verify(); |
6145 | |
6146 // If a concurrent region freeing operation is in progress it will | |
6147 // be difficult to correctly attributed any free regions we come | |
6148 // across to the correct free list given that they might belong to | |
6149 // one of several (free_list, secondary_free_list, any local lists, | |
6150 // etc.). So, if that's the case we will skip the rest of the | |
6151 // verification operation. Alternatively, waiting for the concurrent | |
6152 // operation to complete will have a non-trivial effect on the GC's | |
6153 // operation (no concurrent operation will last longer than the | |
6154 // interval between two calls to verification) and it might hide | |
6155 // any issues that we would like to catch during testing. | |
6156 if (free_regions_coming()) { | |
6157 return; | |
6158 } | |
6159 | |
2361 | 6160 // Make sure we append the secondary_free_list on the free_list so |
6161 // that all free regions we will come across can be safely | |
6162 // attributed to the free_list. | |
6163 append_secondary_free_list_if_not_empty_with_lock(); | |
2152 | 6164 |
6165 // Finally, make sure that the region accounting in the lists is | |
6166 // consistent with what we see in the heap. | |
4072 | 6167 _old_set.verify_start(); |
2152 | 6168 _humongous_set.verify_start(); |
6169 _free_list.verify_start(); | |
6170 | |
4072 | 6171 VerifyRegionListsClosure cl(&_old_set, &_humongous_set, &_free_list); |
2152 | 6172 heap_region_iterate(&cl); |
6173 | |
4072 | 6174 _old_set.verify_end(); |
2152 | 6175 _humongous_set.verify_end(); |
6176 _free_list.verify_end(); | |
342 | 6177 } |