Mercurial > hg > truffle
annotate src/share/vm/gc_implementation/g1/g1CollectedHeap.cpp @ 4785:97c00e21fecb
7125281: G1: heap expansion code is replicated
Reviewed-by: brutisso, johnc
author | tonyp |
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date | Mon, 09 Jan 2012 23:50:41 -0500 |
parents | 02838862dec8 |
children | 2ace1c4ee8da |
rev | line source |
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342 | 1 /* |
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2 * Copyright (c) 2001, 2012, Oracle and/or its affiliates. All rights reserved. |
342 | 3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
4 * | |
5 * This code is free software; you can redistribute it and/or modify it | |
6 * under the terms of the GNU General Public License version 2 only, as | |
7 * published by the Free Software Foundation. | |
8 * | |
9 * This code is distributed in the hope that it will be useful, but WITHOUT | |
10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or | |
11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License | |
12 * version 2 for more details (a copy is included in the LICENSE file that | |
13 * accompanied this code). | |
14 * | |
15 * You should have received a copy of the GNU General Public License version | |
16 * 2 along with this work; if not, write to the Free Software Foundation, | |
17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. | |
18 * | |
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19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
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20 * or visit www.oracle.com if you need additional information or have any |
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21 * questions. |
342 | 22 * |
23 */ | |
24 | |
1972 | 25 #include "precompiled.hpp" |
26 #include "code/icBuffer.hpp" | |
27 #include "gc_implementation/g1/bufferingOopClosure.hpp" | |
28 #include "gc_implementation/g1/concurrentG1Refine.hpp" | |
29 #include "gc_implementation/g1/concurrentG1RefineThread.hpp" | |
30 #include "gc_implementation/g1/concurrentMarkThread.inline.hpp" | |
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31 #include "gc_implementation/g1/g1AllocRegion.inline.hpp" |
1972 | 32 #include "gc_implementation/g1/g1CollectedHeap.inline.hpp" |
33 #include "gc_implementation/g1/g1CollectorPolicy.hpp" | |
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34 #include "gc_implementation/g1/g1ErgoVerbose.hpp" |
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35 #include "gc_implementation/g1/g1EvacFailure.hpp" |
1972 | 36 #include "gc_implementation/g1/g1MarkSweep.hpp" |
37 #include "gc_implementation/g1/g1OopClosures.inline.hpp" | |
38 #include "gc_implementation/g1/g1RemSet.inline.hpp" | |
39 #include "gc_implementation/g1/heapRegionRemSet.hpp" | |
40 #include "gc_implementation/g1/heapRegionSeq.inline.hpp" | |
41 #include "gc_implementation/g1/vm_operations_g1.hpp" | |
42 #include "gc_implementation/shared/isGCActiveMark.hpp" | |
43 #include "memory/gcLocker.inline.hpp" | |
44 #include "memory/genOopClosures.inline.hpp" | |
45 #include "memory/generationSpec.hpp" | |
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46 #include "memory/referenceProcessor.hpp" |
1972 | 47 #include "oops/oop.inline.hpp" |
48 #include "oops/oop.pcgc.inline.hpp" | |
49 #include "runtime/aprofiler.hpp" | |
50 #include "runtime/vmThread.hpp" | |
342 | 51 |
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52 size_t G1CollectedHeap::_humongous_object_threshold_in_words = 0; |
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53 |
342 | 54 // turn it on so that the contents of the young list (scan-only / |
55 // to-be-collected) are printed at "strategic" points before / during | |
56 // / after the collection --- this is useful for debugging | |
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57 #define YOUNG_LIST_VERBOSE 0 |
342 | 58 // CURRENT STATUS |
59 // This file is under construction. Search for "FIXME". | |
60 | |
61 // INVARIANTS/NOTES | |
62 // | |
63 // All allocation activity covered by the G1CollectedHeap interface is | |
1973 | 64 // serialized by acquiring the HeapLock. This happens in mem_allocate |
65 // and allocate_new_tlab, which are the "entry" points to the | |
66 // allocation code from the rest of the JVM. (Note that this does not | |
67 // apply to TLAB allocation, which is not part of this interface: it | |
68 // is done by clients of this interface.) | |
342 | 69 |
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70 // Notes on implementation of parallelism in different tasks. |
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71 // |
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72 // G1ParVerifyTask uses heap_region_par_iterate_chunked() for parallelism. |
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73 // The number of GC workers is passed to heap_region_par_iterate_chunked(). |
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74 // It does use run_task() which sets _n_workers in the task. |
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75 // G1ParTask executes g1_process_strong_roots() -> |
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76 // SharedHeap::process_strong_roots() which calls eventuall to |
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77 // CardTableModRefBS::par_non_clean_card_iterate_work() which uses |
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78 // SequentialSubTasksDone. SharedHeap::process_strong_roots() also |
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79 // directly uses SubTasksDone (_process_strong_tasks field in SharedHeap). |
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80 // |
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81 |
342 | 82 // Local to this file. |
83 | |
84 class RefineCardTableEntryClosure: public CardTableEntryClosure { | |
85 SuspendibleThreadSet* _sts; | |
86 G1RemSet* _g1rs; | |
87 ConcurrentG1Refine* _cg1r; | |
88 bool _concurrent; | |
89 public: | |
90 RefineCardTableEntryClosure(SuspendibleThreadSet* sts, | |
91 G1RemSet* g1rs, | |
92 ConcurrentG1Refine* cg1r) : | |
93 _sts(sts), _g1rs(g1rs), _cg1r(cg1r), _concurrent(true) | |
94 {} | |
95 bool do_card_ptr(jbyte* card_ptr, int worker_i) { | |
1705 | 96 bool oops_into_cset = _g1rs->concurrentRefineOneCard(card_ptr, worker_i, false); |
97 // This path is executed by the concurrent refine or mutator threads, | |
98 // concurrently, and so we do not care if card_ptr contains references | |
99 // that point into the collection set. | |
100 assert(!oops_into_cset, "should be"); | |
101 | |
342 | 102 if (_concurrent && _sts->should_yield()) { |
103 // Caller will actually yield. | |
104 return false; | |
105 } | |
106 // Otherwise, we finished successfully; return true. | |
107 return true; | |
108 } | |
109 void set_concurrent(bool b) { _concurrent = b; } | |
110 }; | |
111 | |
112 | |
113 class ClearLoggedCardTableEntryClosure: public CardTableEntryClosure { | |
114 int _calls; | |
115 G1CollectedHeap* _g1h; | |
116 CardTableModRefBS* _ctbs; | |
117 int _histo[256]; | |
118 public: | |
119 ClearLoggedCardTableEntryClosure() : | |
120 _calls(0) | |
121 { | |
122 _g1h = G1CollectedHeap::heap(); | |
123 _ctbs = (CardTableModRefBS*)_g1h->barrier_set(); | |
124 for (int i = 0; i < 256; i++) _histo[i] = 0; | |
125 } | |
126 bool do_card_ptr(jbyte* card_ptr, int worker_i) { | |
127 if (_g1h->is_in_reserved(_ctbs->addr_for(card_ptr))) { | |
128 _calls++; | |
129 unsigned char* ujb = (unsigned char*)card_ptr; | |
130 int ind = (int)(*ujb); | |
131 _histo[ind]++; | |
132 *card_ptr = -1; | |
133 } | |
134 return true; | |
135 } | |
136 int calls() { return _calls; } | |
137 void print_histo() { | |
138 gclog_or_tty->print_cr("Card table value histogram:"); | |
139 for (int i = 0; i < 256; i++) { | |
140 if (_histo[i] != 0) { | |
141 gclog_or_tty->print_cr(" %d: %d", i, _histo[i]); | |
142 } | |
143 } | |
144 } | |
145 }; | |
146 | |
147 class RedirtyLoggedCardTableEntryClosure: public CardTableEntryClosure { | |
148 int _calls; | |
149 G1CollectedHeap* _g1h; | |
150 CardTableModRefBS* _ctbs; | |
151 public: | |
152 RedirtyLoggedCardTableEntryClosure() : | |
153 _calls(0) | |
154 { | |
155 _g1h = G1CollectedHeap::heap(); | |
156 _ctbs = (CardTableModRefBS*)_g1h->barrier_set(); | |
157 } | |
158 bool do_card_ptr(jbyte* card_ptr, int worker_i) { | |
159 if (_g1h->is_in_reserved(_ctbs->addr_for(card_ptr))) { | |
160 _calls++; | |
161 *card_ptr = 0; | |
162 } | |
163 return true; | |
164 } | |
165 int calls() { return _calls; } | |
166 }; | |
167 | |
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168 class RedirtyLoggedCardTableEntryFastClosure : public CardTableEntryClosure { |
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169 public: |
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170 bool do_card_ptr(jbyte* card_ptr, int worker_i) { |
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171 *card_ptr = CardTableModRefBS::dirty_card_val(); |
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172 return true; |
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173 } |
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174 }; |
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175 |
342 | 176 YoungList::YoungList(G1CollectedHeap* g1h) |
177 : _g1h(g1h), _head(NULL), | |
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178 _length(0), |
342 | 179 _last_sampled_rs_lengths(0), |
545 | 180 _survivor_head(NULL), _survivor_tail(NULL), _survivor_length(0) |
342 | 181 { |
182 guarantee( check_list_empty(false), "just making sure..." ); | |
183 } | |
184 | |
185 void YoungList::push_region(HeapRegion *hr) { | |
186 assert(!hr->is_young(), "should not already be young"); | |
187 assert(hr->get_next_young_region() == NULL, "cause it should!"); | |
188 | |
189 hr->set_next_young_region(_head); | |
190 _head = hr; | |
191 | |
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192 _g1h->g1_policy()->set_region_eden(hr, (int) _length); |
342 | 193 ++_length; |
194 } | |
195 | |
196 void YoungList::add_survivor_region(HeapRegion* hr) { | |
545 | 197 assert(hr->is_survivor(), "should be flagged as survivor region"); |
342 | 198 assert(hr->get_next_young_region() == NULL, "cause it should!"); |
199 | |
200 hr->set_next_young_region(_survivor_head); | |
201 if (_survivor_head == NULL) { | |
545 | 202 _survivor_tail = hr; |
342 | 203 } |
204 _survivor_head = hr; | |
205 ++_survivor_length; | |
206 } | |
207 | |
208 void YoungList::empty_list(HeapRegion* list) { | |
209 while (list != NULL) { | |
210 HeapRegion* next = list->get_next_young_region(); | |
211 list->set_next_young_region(NULL); | |
212 list->uninstall_surv_rate_group(); | |
213 list->set_not_young(); | |
214 list = next; | |
215 } | |
216 } | |
217 | |
218 void YoungList::empty_list() { | |
219 assert(check_list_well_formed(), "young list should be well formed"); | |
220 | |
221 empty_list(_head); | |
222 _head = NULL; | |
223 _length = 0; | |
224 | |
225 empty_list(_survivor_head); | |
226 _survivor_head = NULL; | |
545 | 227 _survivor_tail = NULL; |
342 | 228 _survivor_length = 0; |
229 | |
230 _last_sampled_rs_lengths = 0; | |
231 | |
232 assert(check_list_empty(false), "just making sure..."); | |
233 } | |
234 | |
235 bool YoungList::check_list_well_formed() { | |
236 bool ret = true; | |
237 | |
238 size_t length = 0; | |
239 HeapRegion* curr = _head; | |
240 HeapRegion* last = NULL; | |
241 while (curr != NULL) { | |
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242 if (!curr->is_young()) { |
342 | 243 gclog_or_tty->print_cr("### YOUNG REGION "PTR_FORMAT"-"PTR_FORMAT" " |
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244 "incorrectly tagged (y: %d, surv: %d)", |
342 | 245 curr->bottom(), curr->end(), |
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246 curr->is_young(), curr->is_survivor()); |
342 | 247 ret = false; |
248 } | |
249 ++length; | |
250 last = curr; | |
251 curr = curr->get_next_young_region(); | |
252 } | |
253 ret = ret && (length == _length); | |
254 | |
255 if (!ret) { | |
256 gclog_or_tty->print_cr("### YOUNG LIST seems not well formed!"); | |
257 gclog_or_tty->print_cr("### list has %d entries, _length is %d", | |
258 length, _length); | |
259 } | |
260 | |
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261 return ret; |
342 | 262 } |
263 | |
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264 bool YoungList::check_list_empty(bool check_sample) { |
342 | 265 bool ret = true; |
266 | |
267 if (_length != 0) { | |
268 gclog_or_tty->print_cr("### YOUNG LIST should have 0 length, not %d", | |
269 _length); | |
270 ret = false; | |
271 } | |
272 if (check_sample && _last_sampled_rs_lengths != 0) { | |
273 gclog_or_tty->print_cr("### YOUNG LIST has non-zero last sampled RS lengths"); | |
274 ret = false; | |
275 } | |
276 if (_head != NULL) { | |
277 gclog_or_tty->print_cr("### YOUNG LIST does not have a NULL head"); | |
278 ret = false; | |
279 } | |
280 if (!ret) { | |
281 gclog_or_tty->print_cr("### YOUNG LIST does not seem empty"); | |
282 } | |
283 | |
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284 return ret; |
342 | 285 } |
286 | |
287 void | |
288 YoungList::rs_length_sampling_init() { | |
289 _sampled_rs_lengths = 0; | |
290 _curr = _head; | |
291 } | |
292 | |
293 bool | |
294 YoungList::rs_length_sampling_more() { | |
295 return _curr != NULL; | |
296 } | |
297 | |
298 void | |
299 YoungList::rs_length_sampling_next() { | |
300 assert( _curr != NULL, "invariant" ); | |
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301 size_t rs_length = _curr->rem_set()->occupied(); |
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302 |
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303 _sampled_rs_lengths += rs_length; |
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304 |
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305 // The current region may not yet have been added to the |
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306 // incremental collection set (it gets added when it is |
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307 // retired as the current allocation region). |
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308 if (_curr->in_collection_set()) { |
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309 // Update the collection set policy information for this region |
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310 _g1h->g1_policy()->update_incremental_cset_info(_curr, rs_length); |
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311 } |
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312 |
342 | 313 _curr = _curr->get_next_young_region(); |
314 if (_curr == NULL) { | |
315 _last_sampled_rs_lengths = _sampled_rs_lengths; | |
316 // gclog_or_tty->print_cr("last sampled RS lengths = %d", _last_sampled_rs_lengths); | |
317 } | |
318 } | |
319 | |
320 void | |
321 YoungList::reset_auxilary_lists() { | |
322 guarantee( is_empty(), "young list should be empty" ); | |
323 assert(check_list_well_formed(), "young list should be well formed"); | |
324 | |
325 // Add survivor regions to SurvRateGroup. | |
326 _g1h->g1_policy()->note_start_adding_survivor_regions(); | |
545 | 327 _g1h->g1_policy()->finished_recalculating_age_indexes(true /* is_survivors */); |
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328 |
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329 int young_index_in_cset = 0; |
342 | 330 for (HeapRegion* curr = _survivor_head; |
331 curr != NULL; | |
332 curr = curr->get_next_young_region()) { | |
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333 _g1h->g1_policy()->set_region_survivor(curr, young_index_in_cset); |
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334 |
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335 // The region is a non-empty survivor so let's add it to |
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336 // the incremental collection set for the next evacuation |
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337 // pause. |
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338 _g1h->g1_policy()->add_region_to_incremental_cset_rhs(curr); |
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339 young_index_in_cset += 1; |
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340 } |
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341 assert((size_t) young_index_in_cset == _survivor_length, |
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342 "post-condition"); |
342 | 343 _g1h->g1_policy()->note_stop_adding_survivor_regions(); |
344 | |
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345 _head = _survivor_head; |
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346 _length = _survivor_length; |
342 | 347 if (_survivor_head != NULL) { |
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348 assert(_survivor_tail != NULL, "cause it shouldn't be"); |
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349 assert(_survivor_length > 0, "invariant"); |
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350 _survivor_tail->set_next_young_region(NULL); |
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351 } |
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352 |
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353 // Don't clear the survivor list handles until the start of |
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354 // the next evacuation pause - we need it in order to re-tag |
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355 // the survivor regions from this evacuation pause as 'young' |
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356 // at the start of the next. |
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357 |
545 | 358 _g1h->g1_policy()->finished_recalculating_age_indexes(false /* is_survivors */); |
342 | 359 |
360 assert(check_list_well_formed(), "young list should be well formed"); | |
361 } | |
362 | |
363 void YoungList::print() { | |
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364 HeapRegion* lists[] = {_head, _survivor_head}; |
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365 const char* names[] = {"YOUNG", "SURVIVOR"}; |
342 | 366 |
367 for (unsigned int list = 0; list < ARRAY_SIZE(lists); ++list) { | |
368 gclog_or_tty->print_cr("%s LIST CONTENTS", names[list]); | |
369 HeapRegion *curr = lists[list]; | |
370 if (curr == NULL) | |
371 gclog_or_tty->print_cr(" empty"); | |
372 while (curr != NULL) { | |
373 gclog_or_tty->print_cr(" [%08x-%08x], t: %08x, P: %08x, N: %08x, C: %08x, " | |
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374 "age: %4d, y: %d, surv: %d", |
342 | 375 curr->bottom(), curr->end(), |
376 curr->top(), | |
377 curr->prev_top_at_mark_start(), | |
378 curr->next_top_at_mark_start(), | |
379 curr->top_at_conc_mark_count(), | |
380 curr->age_in_surv_rate_group_cond(), | |
381 curr->is_young(), | |
382 curr->is_survivor()); | |
383 curr = curr->get_next_young_region(); | |
384 } | |
385 } | |
386 | |
387 gclog_or_tty->print_cr(""); | |
388 } | |
389 | |
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390 void G1CollectedHeap::push_dirty_cards_region(HeapRegion* hr) |
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391 { |
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392 // Claim the right to put the region on the dirty cards region list |
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393 // by installing a self pointer. |
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394 HeapRegion* next = hr->get_next_dirty_cards_region(); |
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395 if (next == NULL) { |
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396 HeapRegion* res = (HeapRegion*) |
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397 Atomic::cmpxchg_ptr(hr, hr->next_dirty_cards_region_addr(), |
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398 NULL); |
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399 if (res == NULL) { |
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400 HeapRegion* head; |
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401 do { |
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402 // Put the region to the dirty cards region list. |
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403 head = _dirty_cards_region_list; |
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404 next = (HeapRegion*) |
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405 Atomic::cmpxchg_ptr(hr, &_dirty_cards_region_list, head); |
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406 if (next == head) { |
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407 assert(hr->get_next_dirty_cards_region() == hr, |
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408 "hr->get_next_dirty_cards_region() != hr"); |
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409 if (next == NULL) { |
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410 // The last region in the list points to itself. |
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411 hr->set_next_dirty_cards_region(hr); |
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412 } else { |
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413 hr->set_next_dirty_cards_region(next); |
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414 } |
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415 } |
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416 } while (next != head); |
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417 } |
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418 } |
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419 } |
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420 |
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421 HeapRegion* G1CollectedHeap::pop_dirty_cards_region() |
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422 { |
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423 HeapRegion* head; |
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424 HeapRegion* hr; |
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425 do { |
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426 head = _dirty_cards_region_list; |
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427 if (head == NULL) { |
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428 return NULL; |
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429 } |
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430 HeapRegion* new_head = head->get_next_dirty_cards_region(); |
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431 if (head == new_head) { |
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432 // The last region. |
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433 new_head = NULL; |
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434 } |
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435 hr = (HeapRegion*)Atomic::cmpxchg_ptr(new_head, &_dirty_cards_region_list, |
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436 head); |
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437 } while (hr != head); |
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438 assert(hr != NULL, "invariant"); |
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439 hr->set_next_dirty_cards_region(NULL); |
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440 return hr; |
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441 } |
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442 |
342 | 443 void G1CollectedHeap::stop_conc_gc_threads() { |
794 | 444 _cg1r->stop(); |
342 | 445 _cmThread->stop(); |
446 } | |
447 | |
3377
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448 #ifdef ASSERT |
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449 // A region is added to the collection set as it is retired |
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450 // so an address p can point to a region which will be in the |
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451 // collection set but has not yet been retired. This method |
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452 // therefore is only accurate during a GC pause after all |
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453 // regions have been retired. It is used for debugging |
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454 // to check if an nmethod has references to objects that can |
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455 // be move during a partial collection. Though it can be |
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456 // inaccurate, it is sufficient for G1 because the conservative |
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457 // implementation of is_scavengable() for G1 will indicate that |
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458 // all nmethods must be scanned during a partial collection. |
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459 bool G1CollectedHeap::is_in_partial_collection(const void* p) { |
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460 HeapRegion* hr = heap_region_containing(p); |
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461 return hr != NULL && hr->in_collection_set(); |
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462 } |
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463 #endif |
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464 |
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465 // Returns true if the reference points to an object that |
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466 // can move in an incremental collecction. |
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467 bool G1CollectedHeap::is_scavengable(const void* p) { |
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468 G1CollectedHeap* g1h = G1CollectedHeap::heap(); |
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469 G1CollectorPolicy* g1p = g1h->g1_policy(); |
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470 HeapRegion* hr = heap_region_containing(p); |
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471 if (hr == NULL) { |
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472 // perm gen (or null) |
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473 return false; |
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474 } else { |
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475 return !hr->isHumongous(); |
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476 } |
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477 } |
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478 |
342 | 479 void G1CollectedHeap::check_ct_logs_at_safepoint() { |
480 DirtyCardQueueSet& dcqs = JavaThread::dirty_card_queue_set(); | |
481 CardTableModRefBS* ct_bs = (CardTableModRefBS*)barrier_set(); | |
482 | |
483 // Count the dirty cards at the start. | |
484 CountNonCleanMemRegionClosure count1(this); | |
485 ct_bs->mod_card_iterate(&count1); | |
486 int orig_count = count1.n(); | |
487 | |
488 // First clear the logged cards. | |
489 ClearLoggedCardTableEntryClosure clear; | |
490 dcqs.set_closure(&clear); | |
491 dcqs.apply_closure_to_all_completed_buffers(); | |
492 dcqs.iterate_closure_all_threads(false); | |
493 clear.print_histo(); | |
494 | |
495 // Now ensure that there's no dirty cards. | |
496 CountNonCleanMemRegionClosure count2(this); | |
497 ct_bs->mod_card_iterate(&count2); | |
498 if (count2.n() != 0) { | |
499 gclog_or_tty->print_cr("Card table has %d entries; %d originally", | |
500 count2.n(), orig_count); | |
501 } | |
502 guarantee(count2.n() == 0, "Card table should be clean."); | |
503 | |
504 RedirtyLoggedCardTableEntryClosure redirty; | |
505 JavaThread::dirty_card_queue_set().set_closure(&redirty); | |
506 dcqs.apply_closure_to_all_completed_buffers(); | |
507 dcqs.iterate_closure_all_threads(false); | |
508 gclog_or_tty->print_cr("Log entries = %d, dirty cards = %d.", | |
509 clear.calls(), orig_count); | |
510 guarantee(redirty.calls() == clear.calls(), | |
511 "Or else mechanism is broken."); | |
512 | |
513 CountNonCleanMemRegionClosure count3(this); | |
514 ct_bs->mod_card_iterate(&count3); | |
515 if (count3.n() != orig_count) { | |
516 gclog_or_tty->print_cr("Should have restored them all: orig = %d, final = %d.", | |
517 orig_count, count3.n()); | |
518 guarantee(count3.n() >= orig_count, "Should have restored them all."); | |
519 } | |
520 | |
521 JavaThread::dirty_card_queue_set().set_closure(_refine_cte_cl); | |
522 } | |
523 | |
524 // Private class members. | |
525 | |
526 G1CollectedHeap* G1CollectedHeap::_g1h; | |
527 | |
528 // Private methods. | |
529 | |
2152 | 530 HeapRegion* |
2361 | 531 G1CollectedHeap::new_region_try_secondary_free_list() { |
2152 | 532 MutexLockerEx x(SecondaryFreeList_lock, Mutex::_no_safepoint_check_flag); |
533 while (!_secondary_free_list.is_empty() || free_regions_coming()) { | |
534 if (!_secondary_free_list.is_empty()) { | |
535 if (G1ConcRegionFreeingVerbose) { | |
536 gclog_or_tty->print_cr("G1ConcRegionFreeing [region alloc] : " | |
537 "secondary_free_list has "SIZE_FORMAT" entries", | |
538 _secondary_free_list.length()); | |
539 } | |
540 // It looks as if there are free regions available on the | |
541 // secondary_free_list. Let's move them to the free_list and try | |
542 // again to allocate from it. | |
543 append_secondary_free_list(); | |
544 | |
545 assert(!_free_list.is_empty(), "if the secondary_free_list was not " | |
546 "empty we should have moved at least one entry to the free_list"); | |
547 HeapRegion* res = _free_list.remove_head(); | |
548 if (G1ConcRegionFreeingVerbose) { | |
549 gclog_or_tty->print_cr("G1ConcRegionFreeing [region alloc] : " | |
550 "allocated "HR_FORMAT" from secondary_free_list", | |
551 HR_FORMAT_PARAMS(res)); | |
552 } | |
553 return res; | |
554 } | |
555 | |
556 // Wait here until we get notifed either when (a) there are no | |
557 // more free regions coming or (b) some regions have been moved on | |
558 // the secondary_free_list. | |
559 SecondaryFreeList_lock->wait(Mutex::_no_safepoint_check_flag); | |
560 } | |
561 | |
562 if (G1ConcRegionFreeingVerbose) { | |
563 gclog_or_tty->print_cr("G1ConcRegionFreeing [region alloc] : " | |
564 "could not allocate from secondary_free_list"); | |
565 } | |
566 return NULL; | |
567 } | |
568 | |
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569 HeapRegion* G1CollectedHeap::new_region(size_t word_size, bool do_expand) { |
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570 assert(!isHumongous(word_size) || word_size <= HeapRegion::GrainWords, |
2152 | 571 "the only time we use this to allocate a humongous region is " |
572 "when we are allocating a single humongous region"); | |
573 | |
574 HeapRegion* res; | |
575 if (G1StressConcRegionFreeing) { | |
576 if (!_secondary_free_list.is_empty()) { | |
577 if (G1ConcRegionFreeingVerbose) { | |
578 gclog_or_tty->print_cr("G1ConcRegionFreeing [region alloc] : " | |
579 "forced to look at the secondary_free_list"); | |
580 } | |
2361 | 581 res = new_region_try_secondary_free_list(); |
2152 | 582 if (res != NULL) { |
583 return res; | |
584 } | |
585 } | |
586 } | |
587 res = _free_list.remove_head_or_null(); | |
588 if (res == NULL) { | |
589 if (G1ConcRegionFreeingVerbose) { | |
590 gclog_or_tty->print_cr("G1ConcRegionFreeing [region alloc] : " | |
591 "res == NULL, trying the secondary_free_list"); | |
592 } | |
2361 | 593 res = new_region_try_secondary_free_list(); |
2152 | 594 } |
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595 if (res == NULL && do_expand && _expand_heap_after_alloc_failure) { |
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596 // Currently, only attempts to allocate GC alloc regions set |
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597 // do_expand to true. So, we should only reach here during a |
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598 // safepoint. If this assumption changes we might have to |
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599 // reconsider the use of _expand_heap_after_alloc_failure. |
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600 assert(SafepointSynchronize::is_at_safepoint(), "invariant"); |
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601 |
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602 ergo_verbose1(ErgoHeapSizing, |
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603 "attempt heap expansion", |
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604 ergo_format_reason("region allocation request failed") |
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605 ergo_format_byte("allocation request"), |
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606 word_size * HeapWordSize); |
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607 if (expand(word_size * HeapWordSize)) { |
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608 // Given that expand() succeeded in expanding the heap, and we |
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609 // always expand the heap by an amount aligned to the heap |
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610 // region size, the free list should in theory not be empty. So |
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611 // it would probably be OK to use remove_head(). But the extra |
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612 // check for NULL is unlikely to be a performance issue here (we |
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613 // just expanded the heap!) so let's just be conservative and |
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614 // use remove_head_or_null(). |
3766 | 615 res = _free_list.remove_head_or_null(); |
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616 } else { |
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617 _expand_heap_after_alloc_failure = false; |
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618 } |
342 | 619 } |
620 return res; | |
621 } | |
622 | |
3766 | 623 size_t G1CollectedHeap::humongous_obj_allocate_find_first(size_t num_regions, |
624 size_t word_size) { | |
2361 | 625 assert(isHumongous(word_size), "word_size should be humongous"); |
626 assert(num_regions * HeapRegion::GrainWords >= word_size, "pre-condition"); | |
627 | |
3766 | 628 size_t first = G1_NULL_HRS_INDEX; |
2152 | 629 if (num_regions == 1) { |
630 // Only one region to allocate, no need to go through the slower | |
631 // path. The caller will attempt the expasion if this fails, so | |
632 // let's not try to expand here too. | |
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633 HeapRegion* hr = new_region(word_size, false /* do_expand */); |
2152 | 634 if (hr != NULL) { |
635 first = hr->hrs_index(); | |
636 } else { | |
3766 | 637 first = G1_NULL_HRS_INDEX; |
2152 | 638 } |
639 } else { | |
640 // We can't allocate humongous regions while cleanupComplete() is | |
641 // running, since some of the regions we find to be empty might not | |
642 // yet be added to the free list and it is not straightforward to | |
643 // know which list they are on so that we can remove them. Note | |
644 // that we only need to do this if we need to allocate more than | |
645 // one region to satisfy the current humongous allocation | |
646 // request. If we are only allocating one region we use the common | |
647 // region allocation code (see above). | |
648 wait_while_free_regions_coming(); | |
2361 | 649 append_secondary_free_list_if_not_empty_with_lock(); |
2152 | 650 |
651 if (free_regions() >= num_regions) { | |
3766 | 652 first = _hrs.find_contiguous(num_regions); |
653 if (first != G1_NULL_HRS_INDEX) { | |
654 for (size_t i = first; i < first + num_regions; ++i) { | |
655 HeapRegion* hr = region_at(i); | |
2152 | 656 assert(hr->is_empty(), "sanity"); |
2361 | 657 assert(is_on_master_free_list(hr), "sanity"); |
2152 | 658 hr->set_pending_removal(true); |
659 } | |
660 _free_list.remove_all_pending(num_regions); | |
661 } | |
662 } | |
663 } | |
664 return first; | |
665 } | |
666 | |
2361 | 667 HeapWord* |
3766 | 668 G1CollectedHeap::humongous_obj_allocate_initialize_regions(size_t first, |
2361 | 669 size_t num_regions, |
670 size_t word_size) { | |
3766 | 671 assert(first != G1_NULL_HRS_INDEX, "pre-condition"); |
2361 | 672 assert(isHumongous(word_size), "word_size should be humongous"); |
673 assert(num_regions * HeapRegion::GrainWords >= word_size, "pre-condition"); | |
674 | |
675 // Index of last region in the series + 1. | |
3766 | 676 size_t last = first + num_regions; |
2361 | 677 |
678 // We need to initialize the region(s) we just discovered. This is | |
679 // a bit tricky given that it can happen concurrently with | |
680 // refinement threads refining cards on these regions and | |
681 // potentially wanting to refine the BOT as they are scanning | |
682 // those cards (this can happen shortly after a cleanup; see CR | |
683 // 6991377). So we have to set up the region(s) carefully and in | |
684 // a specific order. | |
685 | |
686 // The word size sum of all the regions we will allocate. | |
687 size_t word_size_sum = num_regions * HeapRegion::GrainWords; | |
688 assert(word_size <= word_size_sum, "sanity"); | |
689 | |
690 // This will be the "starts humongous" region. | |
3766 | 691 HeapRegion* first_hr = region_at(first); |
2361 | 692 // The header of the new object will be placed at the bottom of |
693 // the first region. | |
694 HeapWord* new_obj = first_hr->bottom(); | |
695 // This will be the new end of the first region in the series that | |
696 // should also match the end of the last region in the seriers. | |
697 HeapWord* new_end = new_obj + word_size_sum; | |
698 // This will be the new top of the first region that will reflect | |
699 // this allocation. | |
700 HeapWord* new_top = new_obj + word_size; | |
701 | |
702 // First, we need to zero the header of the space that we will be | |
703 // allocating. When we update top further down, some refinement | |
704 // threads might try to scan the region. By zeroing the header we | |
705 // ensure that any thread that will try to scan the region will | |
706 // come across the zero klass word and bail out. | |
707 // | |
708 // NOTE: It would not have been correct to have used | |
709 // CollectedHeap::fill_with_object() and make the space look like | |
710 // an int array. The thread that is doing the allocation will | |
711 // later update the object header to a potentially different array | |
712 // type and, for a very short period of time, the klass and length | |
713 // fields will be inconsistent. This could cause a refinement | |
714 // thread to calculate the object size incorrectly. | |
715 Copy::fill_to_words(new_obj, oopDesc::header_size(), 0); | |
716 | |
717 // We will set up the first region as "starts humongous". This | |
718 // will also update the BOT covering all the regions to reflect | |
719 // that there is a single object that starts at the bottom of the | |
720 // first region. | |
721 first_hr->set_startsHumongous(new_top, new_end); | |
722 | |
723 // Then, if there are any, we will set up the "continues | |
724 // humongous" regions. | |
725 HeapRegion* hr = NULL; | |
3766 | 726 for (size_t i = first + 1; i < last; ++i) { |
727 hr = region_at(i); | |
2361 | 728 hr->set_continuesHumongous(first_hr); |
729 } | |
730 // If we have "continues humongous" regions (hr != NULL), then the | |
731 // end of the last one should match new_end. | |
732 assert(hr == NULL || hr->end() == new_end, "sanity"); | |
733 | |
734 // Up to this point no concurrent thread would have been able to | |
735 // do any scanning on any region in this series. All the top | |
736 // fields still point to bottom, so the intersection between | |
737 // [bottom,top] and [card_start,card_end] will be empty. Before we | |
738 // update the top fields, we'll do a storestore to make sure that | |
739 // no thread sees the update to top before the zeroing of the | |
740 // object header and the BOT initialization. | |
741 OrderAccess::storestore(); | |
742 | |
743 // Now that the BOT and the object header have been initialized, | |
744 // we can update top of the "starts humongous" region. | |
745 assert(first_hr->bottom() < new_top && new_top <= first_hr->end(), | |
746 "new_top should be in this region"); | |
747 first_hr->set_top(new_top); | |
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748 if (_hr_printer.is_active()) { |
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749 HeapWord* bottom = first_hr->bottom(); |
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750 HeapWord* end = first_hr->orig_end(); |
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751 if ((first + 1) == last) { |
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752 // the series has a single humongous region |
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753 _hr_printer.alloc(G1HRPrinter::SingleHumongous, first_hr, new_top); |
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754 } else { |
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755 // the series has more than one humongous regions |
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756 _hr_printer.alloc(G1HRPrinter::StartsHumongous, first_hr, end); |
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757 } |
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758 } |
2361 | 759 |
760 // Now, we will update the top fields of the "continues humongous" | |
761 // regions. The reason we need to do this is that, otherwise, | |
762 // these regions would look empty and this will confuse parts of | |
763 // G1. For example, the code that looks for a consecutive number | |
764 // of empty regions will consider them empty and try to | |
765 // re-allocate them. We can extend is_empty() to also include | |
766 // !continuesHumongous(), but it is easier to just update the top | |
767 // fields here. The way we set top for all regions (i.e., top == | |
768 // end for all regions but the last one, top == new_top for the | |
769 // last one) is actually used when we will free up the humongous | |
770 // region in free_humongous_region(). | |
771 hr = NULL; | |
3766 | 772 for (size_t i = first + 1; i < last; ++i) { |
773 hr = region_at(i); | |
2361 | 774 if ((i + 1) == last) { |
775 // last continues humongous region | |
776 assert(hr->bottom() < new_top && new_top <= hr->end(), | |
777 "new_top should fall on this region"); | |
778 hr->set_top(new_top); | |
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779 _hr_printer.alloc(G1HRPrinter::ContinuesHumongous, hr, new_top); |
2361 | 780 } else { |
781 // not last one | |
782 assert(new_top > hr->end(), "new_top should be above this region"); | |
783 hr->set_top(hr->end()); | |
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784 _hr_printer.alloc(G1HRPrinter::ContinuesHumongous, hr, hr->end()); |
2361 | 785 } |
786 } | |
787 // If we have continues humongous regions (hr != NULL), then the | |
788 // end of the last one should match new_end and its top should | |
789 // match new_top. | |
790 assert(hr == NULL || | |
791 (hr->end() == new_end && hr->top() == new_top), "sanity"); | |
792 | |
793 assert(first_hr->used() == word_size * HeapWordSize, "invariant"); | |
794 _summary_bytes_used += first_hr->used(); | |
795 _humongous_set.add(first_hr); | |
796 | |
797 return new_obj; | |
798 } | |
799 | |
342 | 800 // If could fit into free regions w/o expansion, try. |
801 // Otherwise, if can expand, do so. | |
802 // Otherwise, if using ex regions might help, try with ex given back. | |
1973 | 803 HeapWord* G1CollectedHeap::humongous_obj_allocate(size_t word_size) { |
2152 | 804 assert_heap_locked_or_at_safepoint(true /* should_be_vm_thread */); |
805 | |
806 verify_region_sets_optional(); | |
342 | 807 |
808 size_t num_regions = | |
1973 | 809 round_to(word_size, HeapRegion::GrainWords) / HeapRegion::GrainWords; |
342 | 810 size_t x_size = expansion_regions(); |
3766 | 811 size_t fs = _hrs.free_suffix(); |
812 size_t first = humongous_obj_allocate_find_first(num_regions, word_size); | |
813 if (first == G1_NULL_HRS_INDEX) { | |
2152 | 814 // The only thing we can do now is attempt expansion. |
342 | 815 if (fs + x_size >= num_regions) { |
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816 // If the number of regions we're trying to allocate for this |
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817 // object is at most the number of regions in the free suffix, |
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818 // then the call to humongous_obj_allocate_find_first() above |
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819 // should have succeeded and we wouldn't be here. |
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820 // |
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821 // We should only be trying to expand when the free suffix is |
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822 // not sufficient for the object _and_ we have some expansion |
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823 // room available. |
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824 assert(num_regions > fs, "earlier allocation should have succeeded"); |
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825 |
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826 ergo_verbose1(ErgoHeapSizing, |
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827 "attempt heap expansion", |
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828 ergo_format_reason("humongous allocation request failed") |
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829 ergo_format_byte("allocation request"), |
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830 word_size * HeapWordSize); |
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831 if (expand((num_regions - fs) * HeapRegion::GrainBytes)) { |
3766 | 832 // Even though the heap was expanded, it might not have |
833 // reached the desired size. So, we cannot assume that the | |
834 // allocation will succeed. | |
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835 first = humongous_obj_allocate_find_first(num_regions, word_size); |
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836 } |
2152 | 837 } |
838 } | |
839 | |
2361 | 840 HeapWord* result = NULL; |
3766 | 841 if (first != G1_NULL_HRS_INDEX) { |
2361 | 842 result = |
843 humongous_obj_allocate_initialize_regions(first, num_regions, word_size); | |
844 assert(result != NULL, "it should always return a valid result"); | |
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845 |
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846 // A successful humongous object allocation changes the used space |
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847 // information of the old generation so we need to recalculate the |
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848 // sizes and update the jstat counters here. |
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849 g1mm()->update_sizes(); |
2152 | 850 } |
851 | |
852 verify_region_sets_optional(); | |
2361 | 853 |
854 return result; | |
342 | 855 } |
856 | |
1973 | 857 HeapWord* G1CollectedHeap::allocate_new_tlab(size_t word_size) { |
858 assert_heap_not_locked_and_not_at_safepoint(); | |
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859 assert(!isHumongous(word_size), "we do not allow humongous TLABs"); |
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860 |
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861 unsigned int dummy_gc_count_before; |
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862 return attempt_allocation(word_size, &dummy_gc_count_before); |
342 | 863 } |
864 | |
865 HeapWord* | |
866 G1CollectedHeap::mem_allocate(size_t word_size, | |
1973 | 867 bool* gc_overhead_limit_was_exceeded) { |
868 assert_heap_not_locked_and_not_at_safepoint(); | |
342 | 869 |
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870 // Loop until the allocation is satisified, or unsatisfied after GC. |
1973 | 871 for (int try_count = 1; /* we'll return */; try_count += 1) { |
872 unsigned int gc_count_before; | |
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873 |
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874 HeapWord* result = NULL; |
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875 if (!isHumongous(word_size)) { |
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876 result = attempt_allocation(word_size, &gc_count_before); |
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877 } else { |
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878 result = attempt_allocation_humongous(word_size, &gc_count_before); |
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879 } |
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880 if (result != NULL) { |
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881 return result; |
342 | 882 } |
883 | |
884 // Create the garbage collection operation... | |
1973 | 885 VM_G1CollectForAllocation op(gc_count_before, word_size); |
342 | 886 // ...and get the VM thread to execute it. |
887 VMThread::execute(&op); | |
1973 | 888 |
889 if (op.prologue_succeeded() && op.pause_succeeded()) { | |
890 // If the operation was successful we'll return the result even | |
891 // if it is NULL. If the allocation attempt failed immediately | |
892 // after a Full GC, it's unlikely we'll be able to allocate now. | |
893 HeapWord* result = op.result(); | |
894 if (result != NULL && !isHumongous(word_size)) { | |
895 // Allocations that take place on VM operations do not do any | |
896 // card dirtying and we have to do it here. We only have to do | |
897 // this for non-humongous allocations, though. | |
898 dirty_young_block(result, word_size); | |
899 } | |
342 | 900 return result; |
1973 | 901 } else { |
902 assert(op.result() == NULL, | |
903 "the result should be NULL if the VM op did not succeed"); | |
342 | 904 } |
905 | |
906 // Give a warning if we seem to be looping forever. | |
907 if ((QueuedAllocationWarningCount > 0) && | |
908 (try_count % QueuedAllocationWarningCount == 0)) { | |
1973 | 909 warning("G1CollectedHeap::mem_allocate retries %d times", try_count); |
342 | 910 } |
911 } | |
1973 | 912 |
913 ShouldNotReachHere(); | |
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914 return NULL; |
342 | 915 } |
916 | |
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917 HeapWord* G1CollectedHeap::attempt_allocation_slow(size_t word_size, |
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918 unsigned int *gc_count_before_ret) { |
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919 // Make sure you read the note in attempt_allocation_humongous(). |
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920 |
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921 assert_heap_not_locked_and_not_at_safepoint(); |
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922 assert(!isHumongous(word_size), "attempt_allocation_slow() should not " |
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923 "be called for humongous allocation requests"); |
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924 |
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925 // We should only get here after the first-level allocation attempt |
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926 // (attempt_allocation()) failed to allocate. |
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927 |
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928 // We will loop until a) we manage to successfully perform the |
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929 // allocation or b) we successfully schedule a collection which |
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930 // fails to perform the allocation. b) is the only case when we'll |
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931 // return NULL. |
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932 HeapWord* result = NULL; |
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933 for (int try_count = 1; /* we'll return */; try_count += 1) { |
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|
934 bool should_try_gc; |
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|
935 unsigned int gc_count_before; |
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936 |
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937 { |
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938 MutexLockerEx x(Heap_lock); |
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939 |
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940 result = _mutator_alloc_region.attempt_allocation_locked(word_size, |
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941 false /* bot_updates */); |
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942 if (result != NULL) { |
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|
943 return result; |
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|
944 } |
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|
945 |
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946 // If we reach here, attempt_allocation_locked() above failed to |
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947 // allocate a new region. So the mutator alloc region should be NULL. |
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948 assert(_mutator_alloc_region.get() == NULL, "only way to get here"); |
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|
949 |
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950 if (GC_locker::is_active_and_needs_gc()) { |
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951 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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|
952 // No need for an ergo verbose message here, |
20213c8a3c40
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|
953 // can_expand_young_list() does this when it returns true. |
2433
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954 result = _mutator_alloc_region.attempt_allocation_force(word_size, |
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955 false /* bot_updates */); |
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|
956 if (result != NULL) { |
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|
957 return result; |
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|
958 } |
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|
959 } |
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960 should_try_gc = false; |
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|
961 } else { |
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962 // Read the GC count while still holding the Heap_lock. |
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963 gc_count_before = SharedHeap::heap()->total_collections(); |
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|
964 should_try_gc = true; |
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|
965 } |
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|
966 } |
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|
967 |
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|
968 if (should_try_gc) { |
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|
969 bool succeeded; |
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970 result = do_collection_pause(word_size, gc_count_before, &succeeded); |
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971 if (result != NULL) { |
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972 assert(succeeded, "only way to get back a non-NULL result"); |
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|
973 return result; |
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|
974 } |
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|
975 |
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|
976 if (succeeded) { |
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|
977 // If we get here we successfully scheduled a collection which |
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|
978 // failed to allocate. No point in trying to allocate |
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|
979 // further. We'll just return NULL. |
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|
980 MutexLockerEx x(Heap_lock); |
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981 *gc_count_before_ret = SharedHeap::heap()->total_collections(); |
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|
982 return NULL; |
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|
983 } |
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|
984 } else { |
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|
985 GC_locker::stall_until_clear(); |
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|
986 } |
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|
987 |
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|
988 // We can reach here if we were unsuccessul in scheduling a |
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989 // collection (because another thread beat us to it) or if we were |
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|
990 // stalled due to the GC locker. In either can we should retry the |
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|
991 // allocation attempt in case another thread successfully |
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992 // performed a collection and reclaimed enough space. We do the |
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|
993 // first attempt (without holding the Heap_lock) here and the |
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994 // follow-on attempt will be at the start of the next loop |
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|
995 // iteration (after taking the Heap_lock). |
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996 result = _mutator_alloc_region.attempt_allocation(word_size, |
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997 false /* bot_updates */); |
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998 if (result != NULL ){ |
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|
999 return result; |
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|
1000 } |
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|
1001 |
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1002 // Give a warning if we seem to be looping forever. |
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1003 if ((QueuedAllocationWarningCount > 0) && |
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1004 (try_count % QueuedAllocationWarningCount == 0)) { |
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1005 warning("G1CollectedHeap::attempt_allocation_slow() " |
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|
1006 "retries %d times", try_count); |
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|
1007 } |
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|
1008 } |
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|
1009 |
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|
1010 ShouldNotReachHere(); |
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|
1011 return NULL; |
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|
1012 } |
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1013 |
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1014 HeapWord* G1CollectedHeap::attempt_allocation_humongous(size_t word_size, |
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1015 unsigned int * gc_count_before_ret) { |
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1016 // The structure of this method has a lot of similarities to |
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1017 // attempt_allocation_slow(). The reason these two were not merged |
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1018 // into a single one is that such a method would require several "if |
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1019 // allocation is not humongous do this, otherwise do that" |
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1020 // conditional paths which would obscure its flow. In fact, an early |
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1021 // version of this code did use a unified method which was harder to |
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1022 // follow and, as a result, it had subtle bugs that were hard to |
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1023 // track down. So keeping these two methods separate allows each to |
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1024 // be more readable. It will be good to keep these two in sync as |
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1025 // much as possible. |
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1026 |
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1027 assert_heap_not_locked_and_not_at_safepoint(); |
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1028 assert(isHumongous(word_size), "attempt_allocation_humongous() " |
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1029 "should only be called for humongous allocations"); |
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1030 |
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1031 // We will loop until a) we manage to successfully perform the |
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1032 // allocation or b) we successfully schedule a collection which |
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1033 // fails to perform the allocation. b) is the only case when we'll |
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1034 // return NULL. |
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1035 HeapWord* result = NULL; |
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1036 for (int try_count = 1; /* we'll return */; try_count += 1) { |
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1037 bool should_try_gc; |
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1038 unsigned int gc_count_before; |
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1039 |
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1040 { |
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1041 MutexLockerEx x(Heap_lock); |
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1042 |
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1043 // Given that humongous objects are not allocated in young |
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1044 // regions, we'll first try to do the allocation without doing a |
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1045 // collection hoping that there's enough space in the heap. |
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1046 result = humongous_obj_allocate(word_size); |
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1047 if (result != NULL) { |
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1048 return result; |
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1049 } |
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1050 |
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1051 if (GC_locker::is_active_and_needs_gc()) { |
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1052 should_try_gc = false; |
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1053 } else { |
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1054 // Read the GC count while still holding the Heap_lock. |
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1055 gc_count_before = SharedHeap::heap()->total_collections(); |
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1056 should_try_gc = true; |
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1057 } |
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1058 } |
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1059 |
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1060 if (should_try_gc) { |
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1061 // If we failed to allocate the humongous object, we should try to |
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1062 // do a collection pause (if we're allowed) in case it reclaims |
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1063 // enough space for the allocation to succeed after the pause. |
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1064 |
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1065 bool succeeded; |
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1066 result = do_collection_pause(word_size, gc_count_before, &succeeded); |
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1067 if (result != NULL) { |
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1068 assert(succeeded, "only way to get back a non-NULL result"); |
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1069 return result; |
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1070 } |
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1071 |
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1072 if (succeeded) { |
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1073 // If we get here we successfully scheduled a collection which |
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1074 // failed to allocate. No point in trying to allocate |
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1075 // further. We'll just return NULL. |
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1076 MutexLockerEx x(Heap_lock); |
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1077 *gc_count_before_ret = SharedHeap::heap()->total_collections(); |
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1078 return NULL; |
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1079 } |
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1080 } else { |
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1081 GC_locker::stall_until_clear(); |
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1082 } |
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1083 |
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1084 // We can reach here if we were unsuccessul in scheduling a |
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1085 // collection (because another thread beat us to it) or if we were |
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1086 // stalled due to the GC locker. In either can we should retry the |
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1087 // allocation attempt in case another thread successfully |
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1088 // performed a collection and reclaimed enough space. Give a |
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1089 // warning if we seem to be looping forever. |
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1090 |
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1091 if ((QueuedAllocationWarningCount > 0) && |
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1092 (try_count % QueuedAllocationWarningCount == 0)) { |
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1093 warning("G1CollectedHeap::attempt_allocation_humongous() " |
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1094 "retries %d times", try_count); |
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1095 } |
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1096 } |
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1097 |
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1098 ShouldNotReachHere(); |
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1099 return NULL; |
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1100 } |
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1101 |
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1102 HeapWord* G1CollectedHeap::attempt_allocation_at_safepoint(size_t word_size, |
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1103 bool expect_null_mutator_alloc_region) { |
2152 | 1104 assert_at_safepoint(true /* should_be_vm_thread */); |
2433
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1105 assert(_mutator_alloc_region.get() == NULL || |
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1106 !expect_null_mutator_alloc_region, |
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1107 "the current alloc region was unexpectedly found to be non-NULL"); |
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1108 |
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1109 if (!isHumongous(word_size)) { |
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1110 return _mutator_alloc_region.attempt_allocation_locked(word_size, |
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1111 false /* bot_updates */); |
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1112 } else { |
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1113 return humongous_obj_allocate(word_size); |
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1114 } |
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1115 |
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1116 ShouldNotReachHere(); |
342 | 1117 } |
1118 | |
1119 class PostMCRemSetClearClosure: public HeapRegionClosure { | |
1120 ModRefBarrierSet* _mr_bs; | |
1121 public: | |
1122 PostMCRemSetClearClosure(ModRefBarrierSet* mr_bs) : _mr_bs(mr_bs) {} | |
1123 bool doHeapRegion(HeapRegion* r) { | |
1124 r->reset_gc_time_stamp(); | |
1125 if (r->continuesHumongous()) | |
1126 return false; | |
1127 HeapRegionRemSet* hrrs = r->rem_set(); | |
1128 if (hrrs != NULL) hrrs->clear(); | |
1129 // You might think here that we could clear just the cards | |
1130 // corresponding to the used region. But no: if we leave a dirty card | |
1131 // in a region we might allocate into, then it would prevent that card | |
1132 // from being enqueued, and cause it to be missed. | |
1133 // Re: the performance cost: we shouldn't be doing full GC anyway! | |
1134 _mr_bs->clear(MemRegion(r->bottom(), r->end())); | |
1135 return false; | |
1136 } | |
1137 }; | |
1138 | |
1139 | |
1140 class PostMCRemSetInvalidateClosure: public HeapRegionClosure { | |
1141 ModRefBarrierSet* _mr_bs; | |
1142 public: | |
1143 PostMCRemSetInvalidateClosure(ModRefBarrierSet* mr_bs) : _mr_bs(mr_bs) {} | |
1144 bool doHeapRegion(HeapRegion* r) { | |
1145 if (r->continuesHumongous()) return false; | |
1146 if (r->used_region().word_size() != 0) { | |
1147 _mr_bs->invalidate(r->used_region(), true /*whole heap*/); | |
1148 } | |
1149 return false; | |
1150 } | |
1151 }; | |
1152 | |
626
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1153 class RebuildRSOutOfRegionClosure: public HeapRegionClosure { |
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1154 G1CollectedHeap* _g1h; |
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1155 UpdateRSOopClosure _cl; |
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1156 int _worker_i; |
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1157 public: |
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1158 RebuildRSOutOfRegionClosure(G1CollectedHeap* g1, int worker_i = 0) : |
1861 | 1159 _cl(g1->g1_rem_set(), worker_i), |
626
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1160 _worker_i(worker_i), |
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1161 _g1h(g1) |
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1162 { } |
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1163 |
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1164 bool doHeapRegion(HeapRegion* r) { |
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1165 if (!r->continuesHumongous()) { |
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1166 _cl.set_from(r); |
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1167 r->oop_iterate(&_cl); |
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1168 } |
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1169 return false; |
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1170 } |
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1171 }; |
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1172 |
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1173 class ParRebuildRSTask: public AbstractGangTask { |
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1174 G1CollectedHeap* _g1; |
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1175 public: |
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1176 ParRebuildRSTask(G1CollectedHeap* g1) |
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1177 : AbstractGangTask("ParRebuildRSTask"), |
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1178 _g1(g1) |
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1179 { } |
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1180 |
4728
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1181 void work(uint worker_id) { |
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1182 RebuildRSOutOfRegionClosure rebuild_rs(_g1, worker_id); |
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1183 _g1->heap_region_par_iterate_chunked(&rebuild_rs, worker_id, |
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1184 _g1->workers()->active_workers(), |
626
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1185 HeapRegion::RebuildRSClaimValue); |
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1186 } |
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1187 }; |
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1188 |
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1189 class PostCompactionPrinterClosure: public HeapRegionClosure { |
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1190 private: |
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1191 G1HRPrinter* _hr_printer; |
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1192 public: |
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1193 bool doHeapRegion(HeapRegion* hr) { |
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1194 assert(!hr->is_young(), "not expecting to find young regions"); |
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1195 // We only generate output for non-empty regions. |
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1196 if (!hr->is_empty()) { |
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1197 if (!hr->isHumongous()) { |
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1198 _hr_printer->post_compaction(hr, G1HRPrinter::Old); |
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1199 } else if (hr->startsHumongous()) { |
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1200 if (hr->capacity() == HeapRegion::GrainBytes) { |
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1201 // single humongous region |
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1202 _hr_printer->post_compaction(hr, G1HRPrinter::SingleHumongous); |
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1203 } else { |
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1204 _hr_printer->post_compaction(hr, G1HRPrinter::StartsHumongous); |
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1205 } |
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1206 } else { |
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1207 assert(hr->continuesHumongous(), "only way to get here"); |
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1208 _hr_printer->post_compaction(hr, G1HRPrinter::ContinuesHumongous); |
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1209 } |
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1210 } |
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1211 return false; |
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1212 } |
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1213 |
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1214 PostCompactionPrinterClosure(G1HRPrinter* hr_printer) |
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1215 : _hr_printer(hr_printer) { } |
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1216 }; |
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1217 |
1973 | 1218 bool G1CollectedHeap::do_collection(bool explicit_gc, |
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1219 bool clear_all_soft_refs, |
342 | 1220 size_t word_size) { |
2152 | 1221 assert_at_safepoint(true /* should_be_vm_thread */); |
1222 | |
1359
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1223 if (GC_locker::check_active_before_gc()) { |
1973 | 1224 return false; |
1359
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1225 } |
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1226 |
2125
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1227 SvcGCMarker sgcm(SvcGCMarker::FULL); |
342 | 1228 ResourceMark rm; |
1229 | |
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1230 if (PrintHeapAtGC) { |
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1231 Universe::print_heap_before_gc(); |
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1232 } |
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1233 |
4072 | 1234 HRSPhaseSetter x(HRSPhaseFullGC); |
2152 | 1235 verify_region_sets_optional(); |
342 | 1236 |
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1237 const bool do_clear_all_soft_refs = clear_all_soft_refs || |
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1238 collector_policy()->should_clear_all_soft_refs(); |
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1239 |
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1240 ClearedAllSoftRefs casr(do_clear_all_soft_refs, collector_policy()); |
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1241 |
342 | 1242 { |
1243 IsGCActiveMark x; | |
1244 | |
1245 // Timing | |
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1246 bool system_gc = (gc_cause() == GCCause::_java_lang_system_gc); |
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1247 assert(!system_gc || explicit_gc, "invariant"); |
342 | 1248 gclog_or_tty->date_stamp(PrintGC && PrintGCDateStamps); |
1249 TraceCPUTime tcpu(PrintGCDetails, true, gclog_or_tty); | |
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1250 TraceTime t(system_gc ? "Full GC (System.gc())" : "Full GC", |
1387
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1251 PrintGC, true, gclog_or_tty); |
342 | 1252 |
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1253 TraceCollectorStats tcs(g1mm()->full_collection_counters()); |
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1254 TraceMemoryManagerStats tms(true /* fullGC */, gc_cause()); |
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1255 |
342 | 1256 double start = os::elapsedTime(); |
1257 g1_policy()->record_full_collection_start(); | |
1258 | |
2152 | 1259 wait_while_free_regions_coming(); |
2361 | 1260 append_secondary_free_list_if_not_empty_with_lock(); |
2152 | 1261 |
342 | 1262 gc_prologue(true); |
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1263 increment_total_collections(true /* full gc */); |
342 | 1264 |
1265 size_t g1h_prev_used = used(); | |
1266 assert(used() == recalculate_used(), "Should be equal"); | |
1267 | |
1268 if (VerifyBeforeGC && total_collections() >= VerifyGCStartAt) { | |
1269 HandleMark hm; // Discard invalid handles created during verification | |
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1270 gclog_or_tty->print(" VerifyBeforeGC:"); |
342 | 1271 prepare_for_verify(); |
3772
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1272 Universe::verify(/* allow dirty */ true, |
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1273 /* silent */ false, |
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1274 /* option */ VerifyOption_G1UsePrevMarking); |
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1275 |
342 | 1276 } |
3869
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1277 pre_full_gc_dump(); |
342 | 1278 |
1279 COMPILER2_PRESENT(DerivedPointerTable::clear()); | |
1280 | |
3979
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1281 // Disable discovery and empty the discovered lists |
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1282 // for the CM ref processor. |
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1283 ref_processor_cm()->disable_discovery(); |
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1284 ref_processor_cm()->abandon_partial_discovery(); |
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1285 ref_processor_cm()->verify_no_references_recorded(); |
342 | 1286 |
1287 // Abandon current iterations of concurrent marking and concurrent | |
1288 // refinement, if any are in progress. | |
1289 concurrent_mark()->abort(); | |
1290 | |
1291 // Make sure we'll choose a new allocation region afterwards. | |
2433
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1292 release_mutator_alloc_region(); |
636 | 1293 abandon_gc_alloc_regions(); |
1861 | 1294 g1_rem_set()->cleanupHRRS(); |
1394
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1295 |
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1296 // We should call this after we retire any currently active alloc |
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1297 // regions so that all the ALLOC / RETIRE events are generated |
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1298 // before the start GC event. |
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1299 _hr_printer.start_gc(true /* full */, (size_t) total_collections()); |
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1300 |
1394
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1301 // We may have added regions to the current incremental collection |
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1302 // set between the last GC or pause and now. We need to clear the |
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1303 // incremental collection set and then start rebuilding it afresh |
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1304 // after this full GC. |
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1305 abandon_collection_set(g1_policy()->inc_cset_head()); |
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1306 g1_policy()->clear_incremental_cset(); |
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1307 g1_policy()->stop_incremental_cset_building(); |
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1308 |
4072 | 1309 tear_down_region_sets(false /* free_list_only */); |
4710 | 1310 g1_policy()->set_gcs_are_young(true); |
342 | 1311 |
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1312 // See the comments in g1CollectedHeap.hpp and |
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1313 // G1CollectedHeap::ref_processing_init() about |
1974
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1314 // how reference processing currently works in G1. |
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1315 |
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1316 // Temporarily make discovery by the STW ref processor single threaded (non-MT). |
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1317 ReferenceProcessorMTDiscoveryMutator stw_rp_disc_ser(ref_processor_stw(), false); |
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1318 |
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1319 // Temporarily clear the STW ref processor's _is_alive_non_header field. |
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1320 ReferenceProcessorIsAliveMutator stw_rp_is_alive_null(ref_processor_stw(), NULL); |
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1321 |
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1322 ref_processor_stw()->enable_discovery(true /*verify_disabled*/, true /*verify_no_refs*/); |
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1323 ref_processor_stw()->setup_policy(do_clear_all_soft_refs); |
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1324 |
342 | 1325 // Do collection work |
1326 { | |
1327 HandleMark hm; // Discard invalid handles created during gc | |
3979
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1328 G1MarkSweep::invoke_at_safepoint(ref_processor_stw(), do_clear_all_soft_refs); |
342 | 1329 } |
3979
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1330 |
2152 | 1331 assert(free_regions() == 0, "we should not have added any free regions"); |
4072 | 1332 rebuild_region_sets(false /* free_list_only */); |
342 | 1333 |
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1334 // Enqueue any discovered reference objects that have |
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1335 // not been removed from the discovered lists. |
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1336 ref_processor_stw()->enqueue_discovered_references(); |
342 | 1337 |
1338 COMPILER2_PRESENT(DerivedPointerTable::update_pointers()); | |
1339 | |
1089
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1340 MemoryService::track_memory_usage(); |
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1341 |
342 | 1342 if (VerifyAfterGC && total_collections() >= VerifyGCStartAt) { |
1343 HandleMark hm; // Discard invalid handles created during verification | |
1344 gclog_or_tty->print(" VerifyAfterGC:"); | |
637
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|
1345 prepare_for_verify(); |
3772
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|
1346 Universe::verify(/* allow dirty */ false, |
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|
1347 /* silent */ false, |
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1348 /* option */ VerifyOption_G1UsePrevMarking); |
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|
1349 |
342 | 1350 } |
3979
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|
1351 |
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1352 assert(!ref_processor_stw()->discovery_enabled(), "Postcondition"); |
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1353 ref_processor_stw()->verify_no_references_recorded(); |
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1354 |
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|
1355 // Note: since we've just done a full GC, concurrent |
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1356 // marking is no longer active. Therefore we need not |
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|
1357 // re-enable reference discovery for the CM ref processor. |
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|
1358 // That will be done at the start of the next marking cycle. |
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1359 assert(!ref_processor_cm()->discovery_enabled(), "Postcondition"); |
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|
1360 ref_processor_cm()->verify_no_references_recorded(); |
342 | 1361 |
1362 reset_gc_time_stamp(); | |
1363 // Since everything potentially moved, we will clear all remembered | |
626
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1364 // sets, and clear all cards. Later we will rebuild remebered |
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1365 // sets. We will also reset the GC time stamps of the regions. |
342 | 1366 PostMCRemSetClearClosure rs_clear(mr_bs()); |
1367 heap_region_iterate(&rs_clear); | |
1368 | |
1369 // Resize the heap if necessary. | |
1656
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1370 resize_if_necessary_after_full_collection(explicit_gc ? 0 : word_size); |
342 | 1371 |
3778
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1372 if (_hr_printer.is_active()) { |
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1373 // We should do this after we potentially resize the heap so |
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1374 // that all the COMMIT / UNCOMMIT events are generated before |
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1375 // the end GC event. |
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1376 |
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1377 PostCompactionPrinterClosure cl(hr_printer()); |
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1378 heap_region_iterate(&cl); |
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1379 |
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1380 _hr_printer.end_gc(true /* full */, (size_t) total_collections()); |
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1381 } |
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|
1382 |
342 | 1383 if (_cg1r->use_cache()) { |
1384 _cg1r->clear_and_record_card_counts(); | |
1385 _cg1r->clear_hot_cache(); | |
1386 } | |
1387 | |
626
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1388 // Rebuild remembered sets of all regions. |
1833
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1389 if (G1CollectedHeap::use_parallel_gc_threads()) { |
4728
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1390 uint n_workers = |
4095
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1391 AdaptiveSizePolicy::calc_active_workers(workers()->total_workers(), |
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1392 workers()->active_workers(), |
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1393 Threads::number_of_non_daemon_threads()); |
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1394 assert(UseDynamicNumberOfGCThreads || |
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1395 n_workers == workers()->total_workers(), |
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1396 "If not dynamic should be using all the workers"); |
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1397 workers()->set_active_workers(n_workers); |
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|
1398 // Set parallel threads in the heap (_n_par_threads) only |
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1399 // before a parallel phase and always reset it to 0 after |
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1400 // the phase so that the number of parallel threads does |
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1401 // no get carried forward to a serial phase where there |
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1402 // may be code that is "possibly_parallel". |
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1403 set_par_threads(n_workers); |
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1404 |
626
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1405 ParRebuildRSTask rebuild_rs_task(this); |
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1406 assert(check_heap_region_claim_values( |
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1407 HeapRegion::InitialClaimValue), "sanity check"); |
4095
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1408 assert(UseDynamicNumberOfGCThreads || |
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1409 workers()->active_workers() == workers()->total_workers(), |
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1410 "Unless dynamic should use total workers"); |
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1411 // Use the most recent number of active workers |
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1412 assert(workers()->active_workers() > 0, |
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1413 "Active workers not properly set"); |
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|
1414 set_par_threads(workers()->active_workers()); |
626
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1415 workers()->run_task(&rebuild_rs_task); |
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1416 set_par_threads(0); |
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1417 assert(check_heap_region_claim_values( |
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1418 HeapRegion::RebuildRSClaimValue), "sanity check"); |
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1419 reset_heap_region_claim_values(); |
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|
1420 } else { |
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1421 RebuildRSOutOfRegionClosure rebuild_rs(this); |
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1422 heap_region_iterate(&rebuild_rs); |
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1423 } |
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1424 |
342 | 1425 if (PrintGC) { |
1426 print_size_transition(gclog_or_tty, g1h_prev_used, used(), capacity()); | |
1427 } | |
1428 | |
1429 if (true) { // FIXME | |
1430 // Ask the permanent generation to adjust size for full collections | |
1431 perm()->compute_new_size(); | |
1432 } | |
1433 | |
1394
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1434 // Start a new incremental collection set for the next pause |
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1435 assert(g1_policy()->collection_set() == NULL, "must be"); |
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1436 g1_policy()->start_incremental_cset_building(); |
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1437 |
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1438 // Clear the _cset_fast_test bitmap in anticipation of adding |
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1439 // regions to the incremental collection set for the next |
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1440 // evacuation pause. |
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|
1441 clear_cset_fast_test(); |
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|
1442 |
2433
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|
1443 init_mutator_alloc_region(); |
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|
1444 |
342 | 1445 double end = os::elapsedTime(); |
1446 g1_policy()->record_full_collection_end(); | |
1447 | |
546
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1448 #ifdef TRACESPINNING |
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1449 ParallelTaskTerminator::print_termination_counts(); |
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|
1450 #endif |
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1451 |
342 | 1452 gc_epilogue(true); |
1453 | |
794 | 1454 // Discard all rset updates |
1455 JavaThread::dirty_card_queue_set().abandon_logs(); | |
616
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6720309: G1: don't synchronously update RSet during evacuation pauses
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|
1456 assert(!G1DeferredRSUpdate |
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|
1457 || (G1DeferredRSUpdate && (dirty_card_queue_set().completed_buffers_num() == 0)), "Should not be any"); |
342 | 1458 } |
1459 | |
3867
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1460 _young_list->reset_sampled_info(); |
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1461 // At this point there should be no regions in the |
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1462 // entire heap tagged as young. |
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1463 assert( check_young_list_empty(true /* check_heap */), |
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1464 "young list should be empty at this point"); |
838
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1465 |
1656
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1466 // Update the number of full collections that have been completed. |
2030
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1467 increment_full_collections_completed(false /* concurrent */); |
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|
1468 |
3766 | 1469 _hrs.verify_optional(); |
2152 | 1470 verify_region_sets_optional(); |
1471 | |
838
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1472 if (PrintHeapAtGC) { |
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1473 Universe::print_heap_after_gc(); |
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1474 } |
3980
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|
1475 g1mm()->update_sizes(); |
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1476 post_full_gc_dump(); |
1973 | 1477 |
1478 return true; | |
342 | 1479 } |
1480 | |
1481 void G1CollectedHeap::do_full_collection(bool clear_all_soft_refs) { | |
1973 | 1482 // do_collection() will return whether it succeeded in performing |
1483 // the GC. Currently, there is no facility on the | |
1484 // do_full_collection() API to notify the caller than the collection | |
1485 // did not succeed (e.g., because it was locked out by the GC | |
1486 // locker). So, right now, we'll ignore the return value. | |
1487 bool dummy = do_collection(true, /* explicit_gc */ | |
1488 clear_all_soft_refs, | |
1489 0 /* word_size */); | |
342 | 1490 } |
1491 | |
1492 // This code is mostly copied from TenuredGeneration. | |
1493 void | |
1494 G1CollectedHeap:: | |
1495 resize_if_necessary_after_full_collection(size_t word_size) { | |
1496 assert(MinHeapFreeRatio <= MaxHeapFreeRatio, "sanity check"); | |
1497 | |
1498 // Include the current allocation, if any, and bytes that will be | |
1499 // pre-allocated to support collections, as "used". | |
1500 const size_t used_after_gc = used(); | |
1501 const size_t capacity_after_gc = capacity(); | |
1502 const size_t free_after_gc = capacity_after_gc - used_after_gc; | |
1503 | |
1717
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1504 // This is enforced in arguments.cpp. |
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1505 assert(MinHeapFreeRatio <= MaxHeapFreeRatio, |
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1506 "otherwise the code below doesn't make sense"); |
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1507 |
342 | 1508 // We don't have floating point command-line arguments |
1717
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1509 const double minimum_free_percentage = (double) MinHeapFreeRatio / 100.0; |
342 | 1510 const double maximum_used_percentage = 1.0 - minimum_free_percentage; |
1717
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1511 const double maximum_free_percentage = (double) MaxHeapFreeRatio / 100.0; |
342 | 1512 const double minimum_used_percentage = 1.0 - maximum_free_percentage; |
1513 | |
1717
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1514 const size_t min_heap_size = collector_policy()->min_heap_byte_size(); |
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1515 const size_t max_heap_size = collector_policy()->max_heap_byte_size(); |
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1516 |
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1517 // We have to be careful here as these two calculations can overflow |
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1518 // 32-bit size_t's. |
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1519 double used_after_gc_d = (double) used_after_gc; |
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1520 double minimum_desired_capacity_d = used_after_gc_d / maximum_used_percentage; |
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1521 double maximum_desired_capacity_d = used_after_gc_d / minimum_used_percentage; |
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1522 |
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1523 // Let's make sure that they are both under the max heap size, which |
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1524 // by default will make them fit into a size_t. |
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1525 double desired_capacity_upper_bound = (double) max_heap_size; |
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1526 minimum_desired_capacity_d = MIN2(minimum_desired_capacity_d, |
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1527 desired_capacity_upper_bound); |
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1528 maximum_desired_capacity_d = MIN2(maximum_desired_capacity_d, |
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1529 desired_capacity_upper_bound); |
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1530 |
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1531 // We can now safely turn them into size_t's. |
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1532 size_t minimum_desired_capacity = (size_t) minimum_desired_capacity_d; |
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1533 size_t maximum_desired_capacity = (size_t) maximum_desired_capacity_d; |
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1534 |
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1535 // This assert only makes sense here, before we adjust them |
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1536 // with respect to the min and max heap size. |
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1537 assert(minimum_desired_capacity <= maximum_desired_capacity, |
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1538 err_msg("minimum_desired_capacity = "SIZE_FORMAT", " |
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1539 "maximum_desired_capacity = "SIZE_FORMAT, |
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1540 minimum_desired_capacity, maximum_desired_capacity)); |
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1541 |
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1542 // Should not be greater than the heap max size. No need to adjust |
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1543 // it with respect to the heap min size as it's a lower bound (i.e., |
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1544 // we'll try to make the capacity larger than it, not smaller). |
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1545 minimum_desired_capacity = MIN2(minimum_desired_capacity, max_heap_size); |
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1546 // Should not be less than the heap min size. No need to adjust it |
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1547 // with respect to the heap max size as it's an upper bound (i.e., |
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1548 // we'll try to make the capacity smaller than it, not greater). |
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1549 maximum_desired_capacity = MAX2(maximum_desired_capacity, min_heap_size); |
342 | 1550 |
1717
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1551 if (capacity_after_gc < minimum_desired_capacity) { |
342 | 1552 // Don't expand unless it's significant |
1553 size_t expand_bytes = minimum_desired_capacity - capacity_after_gc; | |
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1554 ergo_verbose4(ErgoHeapSizing, |
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1555 "attempt heap expansion", |
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1556 ergo_format_reason("capacity lower than " |
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1557 "min desired capacity after Full GC") |
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1558 ergo_format_byte("capacity") |
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1559 ergo_format_byte("occupancy") |
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1560 ergo_format_byte_perc("min desired capacity"), |
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1561 capacity_after_gc, used_after_gc, |
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1562 minimum_desired_capacity, (double) MinHeapFreeRatio); |
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1563 expand(expand_bytes); |
342 | 1564 |
1565 // No expansion, now see if we want to shrink | |
1717
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1566 } else if (capacity_after_gc > maximum_desired_capacity) { |
342 | 1567 // Capacity too large, compute shrinking size |
1568 size_t shrink_bytes = capacity_after_gc - maximum_desired_capacity; | |
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1569 ergo_verbose4(ErgoHeapSizing, |
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1570 "attempt heap shrinking", |
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1571 ergo_format_reason("capacity higher than " |
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1572 "max desired capacity after Full GC") |
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1573 ergo_format_byte("capacity") |
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1574 ergo_format_byte("occupancy") |
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1575 ergo_format_byte_perc("max desired capacity"), |
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1576 capacity_after_gc, used_after_gc, |
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1577 maximum_desired_capacity, (double) MaxHeapFreeRatio); |
342 | 1578 shrink(shrink_bytes); |
1579 } | |
1580 } | |
1581 | |
1582 | |
1583 HeapWord* | |
1973 | 1584 G1CollectedHeap::satisfy_failed_allocation(size_t word_size, |
1585 bool* succeeded) { | |
2152 | 1586 assert_at_safepoint(true /* should_be_vm_thread */); |
1973 | 1587 |
1588 *succeeded = true; | |
1589 // Let's attempt the allocation first. | |
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1590 HeapWord* result = |
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1591 attempt_allocation_at_safepoint(word_size, |
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1592 false /* expect_null_mutator_alloc_region */); |
1973 | 1593 if (result != NULL) { |
1594 assert(*succeeded, "sanity"); | |
1595 return result; | |
1596 } | |
342 | 1597 |
1598 // In a G1 heap, we're supposed to keep allocation from failing by | |
1599 // incremental pauses. Therefore, at least for now, we'll favor | |
1600 // expansion over collection. (This might change in the future if we can | |
1601 // do something smarter than full collection to satisfy a failed alloc.) | |
1602 result = expand_and_allocate(word_size); | |
1603 if (result != NULL) { | |
1973 | 1604 assert(*succeeded, "sanity"); |
342 | 1605 return result; |
1606 } | |
1607 | |
1973 | 1608 // Expansion didn't work, we'll try to do a Full GC. |
1609 bool gc_succeeded = do_collection(false, /* explicit_gc */ | |
1610 false, /* clear_all_soft_refs */ | |
1611 word_size); | |
1612 if (!gc_succeeded) { | |
1613 *succeeded = false; | |
1614 return NULL; | |
1615 } | |
1616 | |
1617 // Retry the allocation | |
1618 result = attempt_allocation_at_safepoint(word_size, | |
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1619 true /* expect_null_mutator_alloc_region */); |
342 | 1620 if (result != NULL) { |
1973 | 1621 assert(*succeeded, "sanity"); |
342 | 1622 return result; |
1623 } | |
1624 | |
1973 | 1625 // Then, try a Full GC that will collect all soft references. |
1626 gc_succeeded = do_collection(false, /* explicit_gc */ | |
1627 true, /* clear_all_soft_refs */ | |
1628 word_size); | |
1629 if (!gc_succeeded) { | |
1630 *succeeded = false; | |
1631 return NULL; | |
1632 } | |
1633 | |
1634 // Retry the allocation once more | |
1635 result = attempt_allocation_at_safepoint(word_size, | |
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1636 true /* expect_null_mutator_alloc_region */); |
342 | 1637 if (result != NULL) { |
1973 | 1638 assert(*succeeded, "sanity"); |
342 | 1639 return result; |
1640 } | |
1641 | |
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1642 assert(!collector_policy()->should_clear_all_soft_refs(), |
1973 | 1643 "Flag should have been handled and cleared prior to this point"); |
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1644 |
342 | 1645 // What else? We might try synchronous finalization later. If the total |
1646 // space available is large enough for the allocation, then a more | |
1647 // complete compaction phase than we've tried so far might be | |
1648 // appropriate. | |
1973 | 1649 assert(*succeeded, "sanity"); |
342 | 1650 return NULL; |
1651 } | |
1652 | |
1653 // Attempting to expand the heap sufficiently | |
1654 // to support an allocation of the given "word_size". If | |
1655 // successful, perform the allocation and return the address of the | |
1656 // allocated block, or else "NULL". | |
1657 | |
1658 HeapWord* G1CollectedHeap::expand_and_allocate(size_t word_size) { | |
2152 | 1659 assert_at_safepoint(true /* should_be_vm_thread */); |
1660 | |
1661 verify_region_sets_optional(); | |
1973 | 1662 |
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1663 size_t expand_bytes = MAX2(word_size * HeapWordSize, MinHeapDeltaBytes); |
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1664 ergo_verbose1(ErgoHeapSizing, |
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1665 "attempt heap expansion", |
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1666 ergo_format_reason("allocation request failed") |
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1667 ergo_format_byte("allocation request"), |
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1668 word_size * HeapWordSize); |
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1669 if (expand(expand_bytes)) { |
3766 | 1670 _hrs.verify_optional(); |
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1671 verify_region_sets_optional(); |
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1672 return attempt_allocation_at_safepoint(word_size, |
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1673 false /* expect_null_mutator_alloc_region */); |
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1674 } |
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1675 return NULL; |
342 | 1676 } |
1677 | |
3766 | 1678 void G1CollectedHeap::update_committed_space(HeapWord* old_end, |
1679 HeapWord* new_end) { | |
1680 assert(old_end != new_end, "don't call this otherwise"); | |
1681 assert((HeapWord*) _g1_storage.high() == new_end, "invariant"); | |
1682 | |
1683 // Update the committed mem region. | |
1684 _g1_committed.set_end(new_end); | |
1685 // Tell the card table about the update. | |
1686 Universe::heap()->barrier_set()->resize_covered_region(_g1_committed); | |
1687 // Tell the BOT about the update. | |
1688 _bot_shared->resize(_g1_committed.word_size()); | |
1689 } | |
1690 | |
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1691 bool G1CollectedHeap::expand(size_t expand_bytes) { |
342 | 1692 size_t old_mem_size = _g1_storage.committed_size(); |
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1693 size_t aligned_expand_bytes = ReservedSpace::page_align_size_up(expand_bytes); |
342 | 1694 aligned_expand_bytes = align_size_up(aligned_expand_bytes, |
1695 HeapRegion::GrainBytes); | |
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1696 ergo_verbose2(ErgoHeapSizing, |
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1697 "expand the heap", |
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1698 ergo_format_byte("requested expansion amount") |
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1699 ergo_format_byte("attempted expansion amount"), |
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1700 expand_bytes, aligned_expand_bytes); |
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1701 |
3766 | 1702 // First commit the memory. |
1703 HeapWord* old_end = (HeapWord*) _g1_storage.high(); | |
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1704 bool successful = _g1_storage.expand_by(aligned_expand_bytes); |
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1705 if (successful) { |
3766 | 1706 // Then propagate this update to the necessary data structures. |
1707 HeapWord* new_end = (HeapWord*) _g1_storage.high(); | |
1708 update_committed_space(old_end, new_end); | |
1709 | |
1710 FreeRegionList expansion_list("Local Expansion List"); | |
1711 MemRegion mr = _hrs.expand_by(old_end, new_end, &expansion_list); | |
1712 assert(mr.start() == old_end, "post-condition"); | |
1713 // mr might be a smaller region than what was requested if | |
1714 // expand_by() was unable to allocate the HeapRegion instances | |
1715 assert(mr.end() <= new_end, "post-condition"); | |
1716 | |
1717 size_t actual_expand_bytes = mr.byte_size(); | |
1718 assert(actual_expand_bytes <= aligned_expand_bytes, "post-condition"); | |
1719 assert(actual_expand_bytes == expansion_list.total_capacity_bytes(), | |
1720 "post-condition"); | |
1721 if (actual_expand_bytes < aligned_expand_bytes) { | |
1722 // We could not expand _hrs to the desired size. In this case we | |
1723 // need to shrink the committed space accordingly. | |
1724 assert(mr.end() < new_end, "invariant"); | |
1725 | |
1726 size_t diff_bytes = aligned_expand_bytes - actual_expand_bytes; | |
1727 // First uncommit the memory. | |
1728 _g1_storage.shrink_by(diff_bytes); | |
1729 // Then propagate this update to the necessary data structures. | |
1730 update_committed_space(new_end, mr.end()); | |
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1731 } |
3766 | 1732 _free_list.add_as_tail(&expansion_list); |
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1733 |
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1734 if (_hr_printer.is_active()) { |
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1735 HeapWord* curr = mr.start(); |
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1736 while (curr < mr.end()) { |
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1737 HeapWord* curr_end = curr + HeapRegion::GrainWords; |
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1738 _hr_printer.commit(curr, curr_end); |
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1739 curr = curr_end; |
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1740 } |
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1741 assert(curr == mr.end(), "post-condition"); |
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1742 } |
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1743 g1_policy()->record_new_heap_size(n_regions()); |
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1744 } else { |
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1745 ergo_verbose0(ErgoHeapSizing, |
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1746 "did not expand the heap", |
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1747 ergo_format_reason("heap expansion operation failed")); |
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1748 // The expansion of the virtual storage space was unsuccessful. |
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1749 // Let's see if it was because we ran out of swap. |
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1750 if (G1ExitOnExpansionFailure && |
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1751 _g1_storage.uncommitted_size() >= aligned_expand_bytes) { |
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1752 // We had head room... |
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1753 vm_exit_out_of_memory(aligned_expand_bytes, "G1 heap expansion"); |
342 | 1754 } |
1755 } | |
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1756 return successful; |
342 | 1757 } |
1758 | |
3766 | 1759 void G1CollectedHeap::shrink_helper(size_t shrink_bytes) { |
342 | 1760 size_t old_mem_size = _g1_storage.committed_size(); |
1761 size_t aligned_shrink_bytes = | |
1762 ReservedSpace::page_align_size_down(shrink_bytes); | |
1763 aligned_shrink_bytes = align_size_down(aligned_shrink_bytes, | |
1764 HeapRegion::GrainBytes); | |
1765 size_t num_regions_deleted = 0; | |
3766 | 1766 MemRegion mr = _hrs.shrink_by(aligned_shrink_bytes, &num_regions_deleted); |
1767 HeapWord* old_end = (HeapWord*) _g1_storage.high(); | |
1768 assert(mr.end() == old_end, "post-condition"); | |
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1769 |
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1770 ergo_verbose3(ErgoHeapSizing, |
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1771 "shrink the heap", |
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1772 ergo_format_byte("requested shrinking amount") |
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1773 ergo_format_byte("aligned shrinking amount") |
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1774 ergo_format_byte("attempted shrinking amount"), |
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1775 shrink_bytes, aligned_shrink_bytes, mr.byte_size()); |
3766 | 1776 if (mr.byte_size() > 0) { |
3778
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1777 if (_hr_printer.is_active()) { |
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1778 HeapWord* curr = mr.end(); |
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1779 while (curr > mr.start()) { |
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1780 HeapWord* curr_end = curr; |
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1781 curr -= HeapRegion::GrainWords; |
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1782 _hr_printer.uncommit(curr, curr_end); |
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1783 } |
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1784 assert(curr == mr.start(), "post-condition"); |
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1785 } |
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1786 |
342 | 1787 _g1_storage.shrink_by(mr.byte_size()); |
3766 | 1788 HeapWord* new_end = (HeapWord*) _g1_storage.high(); |
1789 assert(mr.start() == new_end, "post-condition"); | |
1790 | |
1791 _expansion_regions += num_regions_deleted; | |
1792 update_committed_space(old_end, new_end); | |
1793 HeapRegionRemSet::shrink_heap(n_regions()); | |
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1794 g1_policy()->record_new_heap_size(n_regions()); |
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1795 } else { |
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1796 ergo_verbose0(ErgoHeapSizing, |
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1797 "did not shrink the heap", |
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1798 ergo_format_reason("heap shrinking operation failed")); |
342 | 1799 } |
1800 } | |
1801 | |
1802 void G1CollectedHeap::shrink(size_t shrink_bytes) { | |
2152 | 1803 verify_region_sets_optional(); |
1804 | |
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1805 // We should only reach here at the end of a Full GC which means we |
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1806 // should not not be holding to any GC alloc regions. The method |
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1807 // below will make sure of that and do any remaining clean up. |
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1808 abandon_gc_alloc_regions(); |
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1809 |
2152 | 1810 // Instead of tearing down / rebuilding the free lists here, we |
1811 // could instead use the remove_all_pending() method on free_list to | |
1812 // remove only the ones that we need to remove. | |
4072 | 1813 tear_down_region_sets(true /* free_list_only */); |
342 | 1814 shrink_helper(shrink_bytes); |
4072 | 1815 rebuild_region_sets(true /* free_list_only */); |
2152 | 1816 |
3766 | 1817 _hrs.verify_optional(); |
2152 | 1818 verify_region_sets_optional(); |
342 | 1819 } |
1820 | |
1821 // Public methods. | |
1822 | |
1823 #ifdef _MSC_VER // the use of 'this' below gets a warning, make it go away | |
1824 #pragma warning( disable:4355 ) // 'this' : used in base member initializer list | |
1825 #endif // _MSC_VER | |
1826 | |
1827 | |
1828 G1CollectedHeap::G1CollectedHeap(G1CollectorPolicy* policy_) : | |
1829 SharedHeap(policy_), | |
1830 _g1_policy(policy_), | |
1111 | 1831 _dirty_card_queue_set(false), |
1705 | 1832 _into_cset_dirty_card_queue_set(false), |
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1833 _is_alive_closure_cm(this), |
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1834 _is_alive_closure_stw(this), |
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1835 _ref_processor_cm(NULL), |
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1836 _ref_processor_stw(NULL), |
342 | 1837 _process_strong_tasks(new SubTasksDone(G1H_PS_NumElements)), |
1838 _bot_shared(NULL), | |
1839 _objs_with_preserved_marks(NULL), _preserved_marks_of_objs(NULL), | |
1840 _evac_failure_scan_stack(NULL) , | |
1841 _mark_in_progress(false), | |
2152 | 1842 _cg1r(NULL), _summary_bytes_used(0), |
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1843 _g1mm(NULL), |
342 | 1844 _refine_cte_cl(NULL), |
1845 _full_collection(false), | |
2152 | 1846 _free_list("Master Free List"), |
1847 _secondary_free_list("Secondary Free List"), | |
4072 | 1848 _old_set("Old Set"), |
2152 | 1849 _humongous_set("Master Humongous Set"), |
1850 _free_regions_coming(false), | |
342 | 1851 _young_list(new YoungList(this)), |
1852 _gc_time_stamp(0), | |
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1853 _retained_old_gc_alloc_region(NULL), |
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1854 _expand_heap_after_alloc_failure(true), |
526 | 1855 _surviving_young_words(NULL), |
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1856 _full_collections_completed(0), |
526 | 1857 _in_cset_fast_test(NULL), |
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1858 _in_cset_fast_test_base(NULL), |
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1859 _dirty_cards_region_list(NULL), |
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1860 _worker_cset_start_region(NULL), |
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1861 _worker_cset_start_region_time_stamp(NULL) { |
342 | 1862 _g1h = this; // To catch bugs. |
1863 if (_process_strong_tasks == NULL || !_process_strong_tasks->valid()) { | |
1864 vm_exit_during_initialization("Failed necessary allocation."); | |
1865 } | |
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1866 |
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1867 _humongous_object_threshold_in_words = HeapRegion::GrainWords / 2; |
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1868 |
342 | 1869 int n_queues = MAX2((int)ParallelGCThreads, 1); |
1870 _task_queues = new RefToScanQueueSet(n_queues); | |
1871 | |
1872 int n_rem_sets = HeapRegionRemSet::num_par_rem_sets(); | |
1873 assert(n_rem_sets > 0, "Invariant."); | |
1874 | |
1875 HeapRegionRemSetIterator** iter_arr = | |
1876 NEW_C_HEAP_ARRAY(HeapRegionRemSetIterator*, n_queues); | |
1877 for (int i = 0; i < n_queues; i++) { | |
1878 iter_arr[i] = new HeapRegionRemSetIterator(); | |
1879 } | |
1880 _rem_set_iterator = iter_arr; | |
1881 | |
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1882 _worker_cset_start_region = NEW_C_HEAP_ARRAY(HeapRegion*, n_queues); |
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1883 _worker_cset_start_region_time_stamp = NEW_C_HEAP_ARRAY(unsigned int, n_queues); |
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1884 |
342 | 1885 for (int i = 0; i < n_queues; i++) { |
1886 RefToScanQueue* q = new RefToScanQueue(); | |
1887 q->initialize(); | |
1888 _task_queues->register_queue(i, q); | |
1889 } | |
1890 | |
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1891 clear_cset_start_regions(); |
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1892 |
342 | 1893 guarantee(_task_queues != NULL, "task_queues allocation failure."); |
1894 } | |
1895 | |
1896 jint G1CollectedHeap::initialize() { | |
1166 | 1897 CollectedHeap::pre_initialize(); |
342 | 1898 os::enable_vtime(); |
1899 | |
1900 // Necessary to satisfy locking discipline assertions. | |
1901 | |
1902 MutexLocker x(Heap_lock); | |
1903 | |
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1904 // We have to initialize the printer before committing the heap, as |
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1905 // it will be used then. |
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1906 _hr_printer.set_active(G1PrintHeapRegions); |
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1907 |
342 | 1908 // While there are no constraints in the GC code that HeapWordSize |
1909 // be any particular value, there are multiple other areas in the | |
1910 // system which believe this to be true (e.g. oop->object_size in some | |
1911 // cases incorrectly returns the size in wordSize units rather than | |
1912 // HeapWordSize). | |
1913 guarantee(HeapWordSize == wordSize, "HeapWordSize must equal wordSize"); | |
1914 | |
1915 size_t init_byte_size = collector_policy()->initial_heap_byte_size(); | |
1916 size_t max_byte_size = collector_policy()->max_heap_byte_size(); | |
1917 | |
1918 // Ensure that the sizes are properly aligned. | |
1919 Universe::check_alignment(init_byte_size, HeapRegion::GrainBytes, "g1 heap"); | |
1920 Universe::check_alignment(max_byte_size, HeapRegion::GrainBytes, "g1 heap"); | |
1921 | |
1922 _cg1r = new ConcurrentG1Refine(); | |
1923 | |
1924 // Reserve the maximum. | |
1925 PermanentGenerationSpec* pgs = collector_policy()->permanent_generation(); | |
1926 // Includes the perm-gen. | |
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1927 |
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1928 // When compressed oops are enabled, the preferred heap base |
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1929 // is calculated by subtracting the requested size from the |
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1930 // 32Gb boundary and using the result as the base address for |
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1931 // heap reservation. If the requested size is not aligned to |
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1932 // HeapRegion::GrainBytes (i.e. the alignment that is passed |
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1933 // into the ReservedHeapSpace constructor) then the actual |
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1934 // base of the reserved heap may end up differing from the |
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1935 // address that was requested (i.e. the preferred heap base). |
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1936 // If this happens then we could end up using a non-optimal |
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1937 // compressed oops mode. |
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1938 |
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1939 // Since max_byte_size is aligned to the size of a heap region (checked |
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1940 // above), we also need to align the perm gen size as it might not be. |
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1941 const size_t total_reserved = max_byte_size + |
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1942 align_size_up(pgs->max_size(), HeapRegion::GrainBytes); |
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1943 Universe::check_alignment(total_reserved, HeapRegion::GrainBytes, "g1 heap and perm"); |
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1944 |
642
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1945 char* addr = Universe::preferred_heap_base(total_reserved, Universe::UnscaledNarrowOop); |
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1946 |
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1947 ReservedHeapSpace heap_rs(total_reserved, HeapRegion::GrainBytes, |
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1948 UseLargePages, addr); |
642
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1949 |
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1950 if (UseCompressedOops) { |
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1951 if (addr != NULL && !heap_rs.is_reserved()) { |
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1952 // Failed to reserve at specified address - the requested memory |
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1953 // region is taken already, for example, by 'java' launcher. |
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1954 // Try again to reserver heap higher. |
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1955 addr = Universe::preferred_heap_base(total_reserved, Universe::ZeroBasedNarrowOop); |
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1956 |
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1957 ReservedHeapSpace heap_rs0(total_reserved, HeapRegion::GrainBytes, |
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1958 UseLargePages, addr); |
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1959 |
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1960 if (addr != NULL && !heap_rs0.is_reserved()) { |
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1961 // Failed to reserve at specified address again - give up. |
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1962 addr = Universe::preferred_heap_base(total_reserved, Universe::HeapBasedNarrowOop); |
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1963 assert(addr == NULL, ""); |
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1964 |
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1965 ReservedHeapSpace heap_rs1(total_reserved, HeapRegion::GrainBytes, |
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1966 UseLargePages, addr); |
642
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1967 heap_rs = heap_rs1; |
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1968 } else { |
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1969 heap_rs = heap_rs0; |
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1970 } |
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1971 } |
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1972 } |
342 | 1973 |
1974 if (!heap_rs.is_reserved()) { | |
1975 vm_exit_during_initialization("Could not reserve enough space for object heap"); | |
1976 return JNI_ENOMEM; | |
1977 } | |
1978 | |
1979 // It is important to do this in a way such that concurrent readers can't | |
1980 // temporarily think somethings in the heap. (I've actually seen this | |
1981 // happen in asserts: DLD.) | |
1982 _reserved.set_word_size(0); | |
1983 _reserved.set_start((HeapWord*)heap_rs.base()); | |
1984 _reserved.set_end((HeapWord*)(heap_rs.base() + heap_rs.size())); | |
1985 | |
1986 _expansion_regions = max_byte_size/HeapRegion::GrainBytes; | |
1987 | |
1988 // Create the gen rem set (and barrier set) for the entire reserved region. | |
1989 _rem_set = collector_policy()->create_rem_set(_reserved, 2); | |
1990 set_barrier_set(rem_set()->bs()); | |
1991 if (barrier_set()->is_a(BarrierSet::ModRef)) { | |
1992 _mr_bs = (ModRefBarrierSet*)_barrier_set; | |
1993 } else { | |
1994 vm_exit_during_initialization("G1 requires a mod ref bs."); | |
1995 return JNI_ENOMEM; | |
1996 } | |
1997 | |
1998 // Also create a G1 rem set. | |
1861 | 1999 if (mr_bs()->is_a(BarrierSet::CardTableModRef)) { |
2000 _g1_rem_set = new G1RemSet(this, (CardTableModRefBS*)mr_bs()); | |
342 | 2001 } else { |
1861 | 2002 vm_exit_during_initialization("G1 requires a cardtable mod ref bs."); |
2003 return JNI_ENOMEM; | |
342 | 2004 } |
2005 | |
2006 // Carve out the G1 part of the heap. | |
2007 | |
2008 ReservedSpace g1_rs = heap_rs.first_part(max_byte_size); | |
2009 _g1_reserved = MemRegion((HeapWord*)g1_rs.base(), | |
2010 g1_rs.size()/HeapWordSize); | |
2011 ReservedSpace perm_gen_rs = heap_rs.last_part(max_byte_size); | |
2012 | |
2013 _perm_gen = pgs->init(perm_gen_rs, pgs->init_size(), rem_set()); | |
2014 | |
2015 _g1_storage.initialize(g1_rs, 0); | |
2016 _g1_committed = MemRegion((HeapWord*)_g1_storage.low(), (size_t) 0); | |
3766 | 2017 _hrs.initialize((HeapWord*) _g1_reserved.start(), |
2018 (HeapWord*) _g1_reserved.end(), | |
2019 _expansion_regions); | |
342 | 2020 |
807
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2021 // 6843694 - ensure that the maximum region index can fit |
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2022 // in the remembered set structures. |
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2023 const size_t max_region_idx = ((size_t)1 << (sizeof(RegionIdx_t)*BitsPerByte-1)) - 1; |
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2024 guarantee((max_regions() - 1) <= max_region_idx, "too many regions"); |
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2025 |
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2026 size_t max_cards_per_region = ((size_t)1 << (sizeof(CardIdx_t)*BitsPerByte-1)) - 1; |
942
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|
2027 guarantee(HeapRegion::CardsPerRegion > 0, "make sure it's initialized"); |
3986
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|
2028 guarantee(HeapRegion::CardsPerRegion < max_cards_per_region, |
942
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2029 "too many cards per region"); |
807
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2030 |
2152 | 2031 HeapRegionSet::set_unrealistically_long_length(max_regions() + 1); |
2032 | |
342 | 2033 _bot_shared = new G1BlockOffsetSharedArray(_reserved, |
2034 heap_word_size(init_byte_size)); | |
2035 | |
2036 _g1h = this; | |
2037 | |
1394
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2038 _in_cset_fast_test_length = max_regions(); |
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|
2039 _in_cset_fast_test_base = NEW_C_HEAP_ARRAY(bool, _in_cset_fast_test_length); |
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|
2040 |
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|
2041 // We're biasing _in_cset_fast_test to avoid subtracting the |
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|
2042 // beginning of the heap every time we want to index; basically |
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|
2043 // it's the same with what we do with the card table. |
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|
2044 _in_cset_fast_test = _in_cset_fast_test_base - |
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2045 ((size_t) _g1_reserved.start() >> HeapRegion::LogOfHRGrainBytes); |
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|
2046 |
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2047 // Clear the _cset_fast_test bitmap in anticipation of adding |
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2048 // regions to the incremental collection set for the first |
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|
2049 // evacuation pause. |
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|
2050 clear_cset_fast_test(); |
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2051 |
342 | 2052 // Create the ConcurrentMark data structure and thread. |
2053 // (Must do this late, so that "max_regions" is defined.) | |
2054 _cm = new ConcurrentMark(heap_rs, (int) max_regions()); | |
2055 _cmThread = _cm->cmThread(); | |
2056 | |
2057 // Initialize the from_card cache structure of HeapRegionRemSet. | |
2058 HeapRegionRemSet::init_heap(max_regions()); | |
2059 | |
677 | 2060 // Now expand into the initial heap size. |
2188
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2061 if (!expand(init_byte_size)) { |
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2062 vm_exit_during_initialization("Failed to allocate initial heap."); |
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2063 return JNI_ENOMEM; |
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|
2064 } |
342 | 2065 |
2066 // Perform any initialization actions delegated to the policy. | |
2067 g1_policy()->init(); | |
2068 | |
2069 _refine_cte_cl = | |
2070 new RefineCardTableEntryClosure(ConcurrentG1RefineThread::sts(), | |
2071 g1_rem_set(), | |
2072 concurrent_g1_refine()); | |
2073 JavaThread::dirty_card_queue_set().set_closure(_refine_cte_cl); | |
2074 | |
2075 JavaThread::satb_mark_queue_set().initialize(SATB_Q_CBL_mon, | |
2076 SATB_Q_FL_lock, | |
1111 | 2077 G1SATBProcessCompletedThreshold, |
342 | 2078 Shared_SATB_Q_lock); |
794 | 2079 |
2080 JavaThread::dirty_card_queue_set().initialize(DirtyCardQ_CBL_mon, | |
2081 DirtyCardQ_FL_lock, | |
1111 | 2082 concurrent_g1_refine()->yellow_zone(), |
2083 concurrent_g1_refine()->red_zone(), | |
794 | 2084 Shared_DirtyCardQ_lock); |
2085 | |
616
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2086 if (G1DeferredRSUpdate) { |
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|
2087 dirty_card_queue_set().initialize(DirtyCardQ_CBL_mon, |
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|
2088 DirtyCardQ_FL_lock, |
1111 | 2089 -1, // never trigger processing |
2090 -1, // no limit on length | |
616
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|
2091 Shared_DirtyCardQ_lock, |
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|
2092 &JavaThread::dirty_card_queue_set()); |
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|
2093 } |
1705 | 2094 |
2095 // Initialize the card queue set used to hold cards containing | |
2096 // references into the collection set. | |
2097 _into_cset_dirty_card_queue_set.initialize(DirtyCardQ_CBL_mon, | |
2098 DirtyCardQ_FL_lock, | |
2099 -1, // never trigger processing | |
2100 -1, // no limit on length | |
2101 Shared_DirtyCardQ_lock, | |
2102 &JavaThread::dirty_card_queue_set()); | |
2103 | |
342 | 2104 // In case we're keeping closure specialization stats, initialize those |
2105 // counts and that mechanism. | |
2106 SpecializationStats::clear(); | |
2107 | |
2108 // Do later initialization work for concurrent refinement. | |
2109 _cg1r->init(); | |
2110 | |
2433
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2111 // Here we allocate the dummy full region that is required by the |
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2112 // G1AllocRegion class. If we don't pass an address in the reserved |
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|
2113 // space here, lots of asserts fire. |
3766 | 2114 |
2115 HeapRegion* dummy_region = new_heap_region(0 /* index of bottom region */, | |
2116 _g1_reserved.start()); | |
2433
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2117 // We'll re-use the same region whether the alloc region will |
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2118 // require BOT updates or not and, if it doesn't, then a non-young |
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2119 // region will complain that it cannot support allocations without |
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|
2120 // BOT updates. So we'll tag the dummy region as young to avoid that. |
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|
2121 dummy_region->set_young(); |
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|
2122 // Make sure it's full. |
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2123 dummy_region->set_top(dummy_region->end()); |
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|
2124 G1AllocRegion::setup(this, dummy_region); |
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2125 |
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|
2126 init_mutator_alloc_region(); |
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2127 |
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2128 // Do create of the monitoring and management support so that |
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|
2129 // values in the heap have been properly initialized. |
3980
8229bd737950
7075646: G1: fix inconsistencies in the monitoring data
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|
2130 _g1mm = new G1MonitoringSupport(this); |
3289
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|
2131 |
342 | 2132 return JNI_OK; |
2133 } | |
2134 | |
2135 void G1CollectedHeap::ref_processing_init() { | |
1974
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diff
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|
2136 // Reference processing in G1 currently works as follows: |
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6983204: G1: Nightly test nsk/regression/b4958615 failing with +ExplicitGCInvokesConcurrent
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diff
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|
2137 // |
3979
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|
2138 // * There are two reference processor instances. One is |
4dfb2df418f2
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diff
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|
2139 // used to record and process discovered references |
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|
2140 // during concurrent marking; the other is used to |
4dfb2df418f2
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diff
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|
2141 // record and process references during STW pauses |
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|
2142 // (both full and incremental). |
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|
2143 // * Both ref processors need to 'span' the entire heap as |
4dfb2df418f2
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diff
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|
2144 // the regions in the collection set may be dotted around. |
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6484982: G1: process references during evacuation pauses
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|
2145 // |
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diff
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|
2146 // * For the concurrent marking ref processor: |
4dfb2df418f2
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|
2147 // * Reference discovery is enabled at initial marking. |
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|
2148 // * Reference discovery is disabled and the discovered |
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|
2149 // references processed etc during remarking. |
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diff
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|
2150 // * Reference discovery is MT (see below). |
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|
2151 // * Reference discovery requires a barrier (see below). |
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|
2152 // * Reference processing may or may not be MT |
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|
2153 // (depending on the value of ParallelRefProcEnabled |
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|
2154 // and ParallelGCThreads). |
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|
2155 // * A full GC disables reference discovery by the CM |
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|
2156 // ref processor and abandons any entries on it's |
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|
2157 // discovered lists. |
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|
2158 // |
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2159 // * For the STW processor: |
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2160 // * Non MT discovery is enabled at the start of a full GC. |
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2161 // * Processing and enqueueing during a full GC is non-MT. |
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2162 // * During a full GC, references are processed after marking. |
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|
2163 // |
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2164 // * Discovery (may or may not be MT) is enabled at the start |
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|
2165 // of an incremental evacuation pause. |
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2166 // * References are processed near the end of a STW evacuation pause. |
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|
2167 // * For both types of GC: |
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|
2168 // * Discovery is atomic - i.e. not concurrent. |
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2169 // * Reference discovery will not need a barrier. |
1974
fd1d227ef1b9
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|
2170 |
342 | 2171 SharedHeap::ref_processing_init(); |
2172 MemRegion mr = reserved_region(); | |
3979
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|
2173 |
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|
2174 // Concurrent Mark ref processor |
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|
2175 _ref_processor_cm = |
2369
92da084fefc9
6668573: CMS: reference processing crash if ParallelCMSThreads > ParallelGCThreads
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diff
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|
2176 new ReferenceProcessor(mr, // span |
3979
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|
2177 ParallelRefProcEnabled && (ParallelGCThreads > 1), |
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|
2178 // mt processing |
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|
2179 (int) ParallelGCThreads, |
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|
2180 // degree of mt processing |
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|
2181 (ParallelGCThreads > 1) || (ConcGCThreads > 1), |
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|
2182 // mt discovery |
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|
2183 (int) MAX2(ParallelGCThreads, ConcGCThreads), |
4dfb2df418f2
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|
2184 // degree of mt discovery |
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|
2185 false, |
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|
2186 // Reference discovery is not atomic |
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|
2187 &_is_alive_closure_cm, |
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|
2188 // is alive closure |
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|
2189 // (for efficiency/performance) |
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diff
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|
2190 true); |
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|
2191 // Setting next fields of discovered |
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|
2192 // lists requires a barrier. |
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diff
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|
2193 |
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|
2194 // STW ref processor |
4dfb2df418f2
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diff
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|
2195 _ref_processor_stw = |
4dfb2df418f2
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|
2196 new ReferenceProcessor(mr, // span |
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|
2197 ParallelRefProcEnabled && (ParallelGCThreads > 1), |
4dfb2df418f2
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diff
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|
2198 // mt processing |
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|
2199 MAX2((int)ParallelGCThreads, 1), |
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6484982: G1: process references during evacuation pauses
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diff
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|
2200 // degree of mt processing |
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diff
changeset
|
2201 (ParallelGCThreads > 1), |
4dfb2df418f2
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diff
changeset
|
2202 // mt discovery |
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diff
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|
2203 MAX2((int)ParallelGCThreads, 1), |
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diff
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|
2204 // degree of mt discovery |
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diff
changeset
|
2205 true, |
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diff
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|
2206 // Reference discovery is atomic |
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diff
changeset
|
2207 &_is_alive_closure_stw, |
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diff
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|
2208 // is alive closure |
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diff
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|
2209 // (for efficiency/performance) |
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diff
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|
2210 false); |
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diff
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|
2211 // Setting next fields of discovered |
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|
2212 // lists requires a barrier. |
342 | 2213 } |
2214 | |
2215 size_t G1CollectedHeap::capacity() const { | |
2216 return _g1_committed.byte_size(); | |
2217 } | |
2218 | |
1705 | 2219 void G1CollectedHeap::iterate_dirty_card_closure(CardTableEntryClosure* cl, |
2220 DirtyCardQueue* into_cset_dcq, | |
2221 bool concurrent, | |
342 | 2222 int worker_i) { |
889 | 2223 // Clean cards in the hot card cache |
1705 | 2224 concurrent_g1_refine()->clean_up_cache(worker_i, g1_rem_set(), into_cset_dcq); |
889 | 2225 |
342 | 2226 DirtyCardQueueSet& dcqs = JavaThread::dirty_card_queue_set(); |
2227 int n_completed_buffers = 0; | |
1705 | 2228 while (dcqs.apply_closure_to_completed_buffer(cl, worker_i, 0, true)) { |
342 | 2229 n_completed_buffers++; |
2230 } | |
2231 g1_policy()->record_update_rs_processed_buffers(worker_i, | |
2232 (double) n_completed_buffers); | |
2233 dcqs.clear_n_completed_buffers(); | |
2234 assert(!dcqs.completed_buffers_exist_dirty(), "Completed buffers exist!"); | |
2235 } | |
2236 | |
2237 | |
2238 // Computes the sum of the storage used by the various regions. | |
2239 | |
2240 size_t G1CollectedHeap::used() const { | |
862
36b5611220a7
6863216: Clean up debugging debris inadvertently pushed with 6700789
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861
diff
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|
2241 assert(Heap_lock->owner() != NULL, |
36b5611220a7
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diff
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|
2242 "Should be owned on this thread's behalf."); |
342 | 2243 size_t result = _summary_bytes_used; |
845
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
ysr
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838
diff
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|
2244 // Read only once in case it is set to NULL concurrently |
2433
abdfc822206f
7023069: G1: Introduce symmetric locking in the slow allocation path
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diff
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|
2245 HeapRegion* hr = _mutator_alloc_region.get(); |
845
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6700789: G1: Enable use of compressed oops with G1 heaps
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|
2246 if (hr != NULL) |
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6700789: G1: Enable use of compressed oops with G1 heaps
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diff
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|
2247 result += hr->used(); |
342 | 2248 return result; |
2249 } | |
2250 | |
846
42d84bbbecf4
6859911: G1: assert(Heap_lock->owner() = NULL, "Should be owned on this thread's behalf")
tonyp
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diff
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|
2251 size_t G1CollectedHeap::used_unlocked() const { |
42d84bbbecf4
6859911: G1: assert(Heap_lock->owner() = NULL, "Should be owned on this thread's behalf")
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|
2252 size_t result = _summary_bytes_used; |
42d84bbbecf4
6859911: G1: assert(Heap_lock->owner() = NULL, "Should be owned on this thread's behalf")
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|
2253 return result; |
42d84bbbecf4
6859911: G1: assert(Heap_lock->owner() = NULL, "Should be owned on this thread's behalf")
tonyp
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|
2254 } |
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6859911: G1: assert(Heap_lock->owner() = NULL, "Should be owned on this thread's behalf")
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|
2255 |
342 | 2256 class SumUsedClosure: public HeapRegionClosure { |
2257 size_t _used; | |
2258 public: | |
2259 SumUsedClosure() : _used(0) {} | |
2260 bool doHeapRegion(HeapRegion* r) { | |
2261 if (!r->continuesHumongous()) { | |
2262 _used += r->used(); | |
2263 } | |
2264 return false; | |
2265 } | |
2266 size_t result() { return _used; } | |
2267 }; | |
2268 | |
2269 size_t G1CollectedHeap::recalculate_used() const { | |
2270 SumUsedClosure blk; | |
3766 | 2271 heap_region_iterate(&blk); |
342 | 2272 return blk.result(); |
2273 } | |
2274 | |
2275 size_t G1CollectedHeap::unsafe_max_alloc() { | |
2152 | 2276 if (free_regions() > 0) return HeapRegion::GrainBytes; |
342 | 2277 // otherwise, is there space in the current allocation region? |
2278 | |
2279 // We need to store the current allocation region in a local variable | |
2280 // here. The problem is that this method doesn't take any locks and | |
2281 // there may be other threads which overwrite the current allocation | |
2282 // region field. attempt_allocation(), for example, sets it to NULL | |
2283 // and this can happen *after* the NULL check here but before the call | |
2284 // to free(), resulting in a SIGSEGV. Note that this doesn't appear | |
2285 // to be a problem in the optimized build, since the two loads of the | |
2286 // current allocation region field are optimized away. | |
2433
abdfc822206f
7023069: G1: Introduce symmetric locking in the slow allocation path
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|
2287 HeapRegion* hr = _mutator_alloc_region.get(); |
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|
2288 if (hr == NULL) { |
342 | 2289 return 0; |
2290 } | |
2433
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|
2291 return hr->free(); |
342 | 2292 } |
2293 | |
1656
4e5661ba9d98
6944166: G1: explicit GCs are not always handled correctly
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1611
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|
2294 bool G1CollectedHeap::should_do_concurrent_full_gc(GCCause::Cause cause) { |
4e5661ba9d98
6944166: G1: explicit GCs are not always handled correctly
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|
2295 return |
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1611
diff
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|
2296 ((cause == GCCause::_gc_locker && GCLockerInvokesConcurrent) || |
4e5661ba9d98
6944166: G1: explicit GCs are not always handled correctly
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1611
diff
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|
2297 (cause == GCCause::_java_lang_system_gc && ExplicitGCInvokesConcurrent)); |
4e5661ba9d98
6944166: G1: explicit GCs are not always handled correctly
tonyp
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1611
diff
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|
2298 } |
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diff
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|
2299 |
3285
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7011855: G1: non-product flag to artificially grow the heap
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diff
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|
2300 #ifndef PRODUCT |
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7011855: G1: non-product flag to artificially grow the heap
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|
2301 void G1CollectedHeap::allocate_dummy_regions() { |
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7011855: G1: non-product flag to artificially grow the heap
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diff
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|
2302 // Let's fill up most of the region |
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diff
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|
2303 size_t word_size = HeapRegion::GrainWords - 1024; |
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7011855: G1: non-product flag to artificially grow the heap
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|
2304 // And as a result the region we'll allocate will be humongous. |
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7011855: G1: non-product flag to artificially grow the heap
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|
2305 guarantee(isHumongous(word_size), "sanity"); |
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7011855: G1: non-product flag to artificially grow the heap
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diff
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|
2306 |
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7011855: G1: non-product flag to artificially grow the heap
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diff
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|
2307 for (uintx i = 0; i < G1DummyRegionsPerGC; ++i) { |
49a67202bc67
7011855: G1: non-product flag to artificially grow the heap
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2433
diff
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|
2308 // Let's use the existing mechanism for the allocation |
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7011855: G1: non-product flag to artificially grow the heap
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|
2309 HeapWord* dummy_obj = humongous_obj_allocate(word_size); |
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7011855: G1: non-product flag to artificially grow the heap
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2433
diff
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|
2310 if (dummy_obj != NULL) { |
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|
2311 MemRegion mr(dummy_obj, word_size); |
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7011855: G1: non-product flag to artificially grow the heap
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|
2312 CollectedHeap::fill_with_object(mr); |
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7011855: G1: non-product flag to artificially grow the heap
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diff
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|
2313 } else { |
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|
2314 // If we can't allocate once, we probably cannot allocate |
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7011855: G1: non-product flag to artificially grow the heap
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diff
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|
2315 // again. Let's get out of the loop. |
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7011855: G1: non-product flag to artificially grow the heap
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|
2316 break; |
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7011855: G1: non-product flag to artificially grow the heap
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|
2317 } |
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|
2318 } |
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|
2319 } |
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2320 #endif // !PRODUCT |
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|
2321 |
2030
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|
2322 void G1CollectedHeap::increment_full_collections_completed(bool concurrent) { |
1656
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2323 MonitorLockerEx x(FullGCCount_lock, Mutex::_no_safepoint_check_flag); |
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2324 |
2030
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2325 // We assume that if concurrent == true, then the caller is a |
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2326 // concurrent thread that was joined the Suspendible Thread |
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2327 // Set. If there's ever a cheap way to check this, we should add an |
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|
2328 // assert here. |
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|
2329 |
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|
2330 // We have already incremented _total_full_collections at the start |
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2331 // of the GC, so total_full_collections() represents how many full |
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|
2332 // collections have been started. |
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|
2333 unsigned int full_collections_started = total_full_collections(); |
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|
2334 |
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|
2335 // Given that this method is called at the end of a Full GC or of a |
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2336 // concurrent cycle, and those can be nested (i.e., a Full GC can |
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|
2337 // interrupt a concurrent cycle), the number of full collections |
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|
2338 // completed should be either one (in the case where there was no |
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|
2339 // nesting) or two (when a Full GC interrupted a concurrent cycle) |
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|
2340 // behind the number of full collections started. |
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|
2341 |
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|
2342 // This is the case for the inner caller, i.e. a Full GC. |
2030
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|
2343 assert(concurrent || |
1656
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|
2344 (full_collections_started == _full_collections_completed + 1) || |
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|
2345 (full_collections_started == _full_collections_completed + 2), |
2030
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|
2346 err_msg("for inner caller (Full GC): full_collections_started = %u " |
1656
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|
2347 "is inconsistent with _full_collections_completed = %u", |
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|
2348 full_collections_started, _full_collections_completed)); |
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|
2349 |
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|
2350 // This is the case for the outer caller, i.e. the concurrent cycle. |
2030
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|
2351 assert(!concurrent || |
1656
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|
2352 (full_collections_started == _full_collections_completed + 1), |
2030
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|
2353 err_msg("for outer caller (concurrent cycle): " |
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|
2354 "full_collections_started = %u " |
1656
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|
2355 "is inconsistent with _full_collections_completed = %u", |
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|
2356 full_collections_started, _full_collections_completed)); |
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|
2357 |
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|
2358 _full_collections_completed += 1; |
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|
2359 |
1840
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|
2360 // We need to clear the "in_progress" flag in the CM thread before |
4e0094bc41fa
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|
2361 // we wake up any waiters (especially when ExplicitInvokesConcurrent |
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diff
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|
2362 // is set) so that if a waiter requests another System.gc() it doesn't |
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1833
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|
2363 // incorrectly see that a marking cyle is still in progress. |
2030
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|
2364 if (concurrent) { |
1840
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|
2365 _cmThread->clear_in_progress(); |
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|
2366 } |
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|
2367 |
1656
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|
2368 // This notify_all() will ensure that a thread that called |
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|
2369 // System.gc() with (with ExplicitGCInvokesConcurrent set or not) |
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|
2370 // and it's waiting for a full GC to finish will be woken up. It is |
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|
2371 // waiting in VM_G1IncCollectionPause::doit_epilogue(). |
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|
2372 FullGCCount_lock->notify_all(); |
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|
2373 } |
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|
2374 |
342 | 2375 void G1CollectedHeap::collect_as_vm_thread(GCCause::Cause cause) { |
2152 | 2376 assert_at_safepoint(true /* should_be_vm_thread */); |
342 | 2377 GCCauseSetter gcs(this, cause); |
2378 switch (cause) { | |
2379 case GCCause::_heap_inspection: | |
2380 case GCCause::_heap_dump: { | |
2381 HandleMark hm; | |
2382 do_full_collection(false); // don't clear all soft refs | |
2383 break; | |
2384 } | |
2385 default: // XXX FIX ME | |
2386 ShouldNotReachHere(); // Unexpected use of this function | |
2387 } | |
2388 } | |
2389 | |
1088
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|
2390 void G1CollectedHeap::collect(GCCause::Cause cause) { |
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6902303: G1: ScavengeALot should cause an incremental, rather than a full, collection
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|
2391 // The caller doesn't have the Heap_lock |
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|
2392 assert(!Heap_lock->owned_by_self(), "this thread should not own the Heap_lock"); |
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|
2393 |
1656
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|
2394 unsigned int gc_count_before; |
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|
2395 unsigned int full_gc_count_before; |
342 | 2396 { |
1088
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|
2397 MutexLocker ml(Heap_lock); |
1973 | 2398 |
1088
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|
2399 // Read the GC count while holding the Heap_lock |
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diff
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|
2400 gc_count_before = SharedHeap::heap()->total_collections(); |
1656
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|
2401 full_gc_count_before = SharedHeap::heap()->total_full_collections(); |
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|
2402 } |
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|
2403 |
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|
2404 if (should_do_concurrent_full_gc(cause)) { |
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|
2405 // Schedule an initial-mark evacuation pause that will start a |
1973 | 2406 // concurrent cycle. We're setting word_size to 0 which means that |
2407 // we are not requesting a post-GC allocation. | |
1656
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|
2408 VM_G1IncCollectionPause op(gc_count_before, |
1973 | 2409 0, /* word_size */ |
2410 true, /* should_initiate_conc_mark */ | |
1656
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|
2411 g1_policy()->max_pause_time_ms(), |
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|
2412 cause); |
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diff
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|
2413 VMThread::execute(&op); |
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|
2414 } else { |
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|
2415 if (cause == GCCause::_gc_locker |
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|
2416 DEBUG_ONLY(|| cause == GCCause::_scavenge_alot)) { |
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|
2417 |
1973 | 2418 // Schedule a standard evacuation pause. We're setting word_size |
2419 // to 0 which means that we are not requesting a post-GC allocation. | |
1656
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|
2420 VM_G1IncCollectionPause op(gc_count_before, |
1973 | 2421 0, /* word_size */ |
1656
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|
2422 false, /* should_initiate_conc_mark */ |
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|
2423 g1_policy()->max_pause_time_ms(), |
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|
2424 cause); |
1088
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diff
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|
2425 VMThread::execute(&op); |
1656
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|
2426 } else { |
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diff
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|
2427 // Schedule a Full GC. |
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diff
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|
2428 VM_G1CollectFull op(gc_count_before, full_gc_count_before, cause); |
1088
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|
2429 VMThread::execute(&op); |
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|
2430 } |
342 | 2431 } |
2432 } | |
2433 | |
2434 bool G1CollectedHeap::is_in(const void* p) const { | |
4708 | 2435 if (_g1_committed.contains(p)) { |
2436 // Given that we know that p is in the committed space, | |
2437 // heap_region_containing_raw() should successfully | |
2438 // return the containing region. | |
2439 HeapRegion* hr = heap_region_containing_raw(p); | |
342 | 2440 return hr->is_in(p); |
2441 } else { | |
2442 return _perm_gen->as_gen()->is_in(p); | |
2443 } | |
2444 } | |
2445 | |
2446 // Iteration functions. | |
2447 | |
2448 // Iterates an OopClosure over all ref-containing fields of objects | |
2449 // within a HeapRegion. | |
2450 | |
2451 class IterateOopClosureRegionClosure: public HeapRegionClosure { | |
2452 MemRegion _mr; | |
2453 OopClosure* _cl; | |
2454 public: | |
2455 IterateOopClosureRegionClosure(MemRegion mr, OopClosure* cl) | |
2456 : _mr(mr), _cl(cl) {} | |
2457 bool doHeapRegion(HeapRegion* r) { | |
2458 if (! r->continuesHumongous()) { | |
2459 r->oop_iterate(_cl); | |
2460 } | |
2461 return false; | |
2462 } | |
2463 }; | |
2464 | |
678 | 2465 void G1CollectedHeap::oop_iterate(OopClosure* cl, bool do_perm) { |
342 | 2466 IterateOopClosureRegionClosure blk(_g1_committed, cl); |
3766 | 2467 heap_region_iterate(&blk); |
678 | 2468 if (do_perm) { |
2469 perm_gen()->oop_iterate(cl); | |
2470 } | |
342 | 2471 } |
2472 | |
678 | 2473 void G1CollectedHeap::oop_iterate(MemRegion mr, OopClosure* cl, bool do_perm) { |
342 | 2474 IterateOopClosureRegionClosure blk(mr, cl); |
3766 | 2475 heap_region_iterate(&blk); |
678 | 2476 if (do_perm) { |
2477 perm_gen()->oop_iterate(cl); | |
2478 } | |
342 | 2479 } |
2480 | |
2481 // Iterates an ObjectClosure over all objects within a HeapRegion. | |
2482 | |
2483 class IterateObjectClosureRegionClosure: public HeapRegionClosure { | |
2484 ObjectClosure* _cl; | |
2485 public: | |
2486 IterateObjectClosureRegionClosure(ObjectClosure* cl) : _cl(cl) {} | |
2487 bool doHeapRegion(HeapRegion* r) { | |
2488 if (! r->continuesHumongous()) { | |
2489 r->object_iterate(_cl); | |
2490 } | |
2491 return false; | |
2492 } | |
2493 }; | |
2494 | |
678 | 2495 void G1CollectedHeap::object_iterate(ObjectClosure* cl, bool do_perm) { |
342 | 2496 IterateObjectClosureRegionClosure blk(cl); |
3766 | 2497 heap_region_iterate(&blk); |
678 | 2498 if (do_perm) { |
2499 perm_gen()->object_iterate(cl); | |
2500 } | |
342 | 2501 } |
2502 | |
2503 void G1CollectedHeap::object_iterate_since_last_GC(ObjectClosure* cl) { | |
2504 // FIXME: is this right? | |
2505 guarantee(false, "object_iterate_since_last_GC not supported by G1 heap"); | |
2506 } | |
2507 | |
2508 // Calls a SpaceClosure on a HeapRegion. | |
2509 | |
2510 class SpaceClosureRegionClosure: public HeapRegionClosure { | |
2511 SpaceClosure* _cl; | |
2512 public: | |
2513 SpaceClosureRegionClosure(SpaceClosure* cl) : _cl(cl) {} | |
2514 bool doHeapRegion(HeapRegion* r) { | |
2515 _cl->do_space(r); | |
2516 return false; | |
2517 } | |
2518 }; | |
2519 | |
2520 void G1CollectedHeap::space_iterate(SpaceClosure* cl) { | |
2521 SpaceClosureRegionClosure blk(cl); | |
3766 | 2522 heap_region_iterate(&blk); |
342 | 2523 } |
2524 | |
3766 | 2525 void G1CollectedHeap::heap_region_iterate(HeapRegionClosure* cl) const { |
2526 _hrs.iterate(cl); | |
342 | 2527 } |
2528 | |
2529 void G1CollectedHeap::heap_region_iterate_from(HeapRegion* r, | |
3766 | 2530 HeapRegionClosure* cl) const { |
2531 _hrs.iterate_from(r, cl); | |
342 | 2532 } |
2533 | |
2534 void | |
2535 G1CollectedHeap::heap_region_par_iterate_chunked(HeapRegionClosure* cl, | |
4728
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|
2536 uint worker, |
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|
2537 uint no_of_par_workers, |
342 | 2538 jint claim_value) { |
355 | 2539 const size_t regions = n_regions(); |
4728
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diff
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|
2540 const uint max_workers = (G1CollectedHeap::use_parallel_gc_threads() ? |
4095
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6593758: RFE: Enhance GC ergonomics to dynamically choose ParallelGCThreads
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4090
diff
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|
2541 no_of_par_workers : |
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2542 1); |
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2543 assert(UseDynamicNumberOfGCThreads || |
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2544 no_of_par_workers == workers()->total_workers(), |
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2545 "Non dynamic should use fixed number of workers"); |
355 | 2546 // try to spread out the starting points of the workers |
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2547 const size_t start_index = regions / max_workers * (size_t) worker; |
355 | 2548 |
2549 // each worker will actually look at all regions | |
2550 for (size_t count = 0; count < regions; ++count) { | |
2551 const size_t index = (start_index + count) % regions; | |
2552 assert(0 <= index && index < regions, "sanity"); | |
2553 HeapRegion* r = region_at(index); | |
2554 // we'll ignore "continues humongous" regions (we'll process them | |
2555 // when we come across their corresponding "start humongous" | |
2556 // region) and regions already claimed | |
2557 if (r->claim_value() == claim_value || r->continuesHumongous()) { | |
2558 continue; | |
2559 } | |
2560 // OK, try to claim it | |
342 | 2561 if (r->claimHeapRegion(claim_value)) { |
355 | 2562 // success! |
2563 assert(!r->continuesHumongous(), "sanity"); | |
2564 if (r->startsHumongous()) { | |
2565 // If the region is "starts humongous" we'll iterate over its | |
2566 // "continues humongous" first; in fact we'll do them | |
2567 // first. The order is important. In on case, calling the | |
2568 // closure on the "starts humongous" region might de-allocate | |
2569 // and clear all its "continues humongous" regions and, as a | |
2570 // result, we might end up processing them twice. So, we'll do | |
2571 // them first (notice: most closures will ignore them anyway) and | |
2572 // then we'll do the "starts humongous" region. | |
2573 for (size_t ch_index = index + 1; ch_index < regions; ++ch_index) { | |
2574 HeapRegion* chr = region_at(ch_index); | |
2575 | |
2576 // if the region has already been claimed or it's not | |
2577 // "continues humongous" we're done | |
2578 if (chr->claim_value() == claim_value || | |
2579 !chr->continuesHumongous()) { | |
2580 break; | |
2581 } | |
2582 | |
2583 // Noone should have claimed it directly. We can given | |
2584 // that we claimed its "starts humongous" region. | |
2585 assert(chr->claim_value() != claim_value, "sanity"); | |
2586 assert(chr->humongous_start_region() == r, "sanity"); | |
2587 | |
2588 if (chr->claimHeapRegion(claim_value)) { | |
2589 // we should always be able to claim it; noone else should | |
2590 // be trying to claim this region | |
2591 | |
2592 bool res2 = cl->doHeapRegion(chr); | |
2593 assert(!res2, "Should not abort"); | |
2594 | |
2595 // Right now, this holds (i.e., no closure that actually | |
2596 // does something with "continues humongous" regions | |
2597 // clears them). We might have to weaken it in the future, | |
2598 // but let's leave these two asserts here for extra safety. | |
2599 assert(chr->continuesHumongous(), "should still be the case"); | |
2600 assert(chr->humongous_start_region() == r, "sanity"); | |
2601 } else { | |
2602 guarantee(false, "we should not reach here"); | |
2603 } | |
2604 } | |
2605 } | |
2606 | |
2607 assert(!r->continuesHumongous(), "sanity"); | |
2608 bool res = cl->doHeapRegion(r); | |
2609 assert(!res, "Should not abort"); | |
2610 } | |
2611 } | |
2612 } | |
2613 | |
390 | 2614 class ResetClaimValuesClosure: public HeapRegionClosure { |
2615 public: | |
2616 bool doHeapRegion(HeapRegion* r) { | |
2617 r->set_claim_value(HeapRegion::InitialClaimValue); | |
2618 return false; | |
2619 } | |
2620 }; | |
2621 | |
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2622 void G1CollectedHeap::reset_heap_region_claim_values() { |
390 | 2623 ResetClaimValuesClosure blk; |
2624 heap_region_iterate(&blk); | |
2625 } | |
2626 | |
4783
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2627 void G1CollectedHeap::reset_cset_heap_region_claim_values() { |
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2628 ResetClaimValuesClosure blk; |
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2629 collection_set_iterate(&blk); |
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2630 } |
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2631 |
355 | 2632 #ifdef ASSERT |
2633 // This checks whether all regions in the heap have the correct claim | |
2634 // value. I also piggy-backed on this a check to ensure that the | |
2635 // humongous_start_region() information on "continues humongous" | |
2636 // regions is correct. | |
2637 | |
2638 class CheckClaimValuesClosure : public HeapRegionClosure { | |
2639 private: | |
2640 jint _claim_value; | |
2641 size_t _failures; | |
2642 HeapRegion* _sh_region; | |
2643 public: | |
2644 CheckClaimValuesClosure(jint claim_value) : | |
2645 _claim_value(claim_value), _failures(0), _sh_region(NULL) { } | |
2646 bool doHeapRegion(HeapRegion* r) { | |
2647 if (r->claim_value() != _claim_value) { | |
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2648 gclog_or_tty->print_cr("Region " HR_FORMAT ", " |
355 | 2649 "claim value = %d, should be %d", |
4097
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2650 HR_FORMAT_PARAMS(r), |
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2651 r->claim_value(), _claim_value); |
355 | 2652 ++_failures; |
2653 } | |
2654 if (!r->isHumongous()) { | |
2655 _sh_region = NULL; | |
2656 } else if (r->startsHumongous()) { | |
2657 _sh_region = r; | |
2658 } else if (r->continuesHumongous()) { | |
2659 if (r->humongous_start_region() != _sh_region) { | |
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2660 gclog_or_tty->print_cr("Region " HR_FORMAT ", " |
355 | 2661 "HS = "PTR_FORMAT", should be "PTR_FORMAT, |
4097
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2662 HR_FORMAT_PARAMS(r), |
355 | 2663 r->humongous_start_region(), |
2664 _sh_region); | |
2665 ++_failures; | |
342 | 2666 } |
2667 } | |
355 | 2668 return false; |
2669 } | |
2670 size_t failures() { | |
2671 return _failures; | |
2672 } | |
2673 }; | |
2674 | |
2675 bool G1CollectedHeap::check_heap_region_claim_values(jint claim_value) { | |
2676 CheckClaimValuesClosure cl(claim_value); | |
2677 heap_region_iterate(&cl); | |
2678 return cl.failures() == 0; | |
2679 } | |
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2680 |
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2681 class CheckClaimValuesInCSetHRClosure: public HeapRegionClosure { |
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2682 jint _claim_value; |
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2683 size_t _failures; |
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2684 |
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2685 public: |
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2686 CheckClaimValuesInCSetHRClosure(jint claim_value) : |
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2687 _claim_value(claim_value), |
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2688 _failures(0) { } |
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2689 |
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2690 size_t failures() { |
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2691 return _failures; |
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|
2692 } |
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2693 |
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2694 bool doHeapRegion(HeapRegion* hr) { |
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2695 assert(hr->in_collection_set(), "how?"); |
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2696 assert(!hr->isHumongous(), "H-region in CSet"); |
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2697 if (hr->claim_value() != _claim_value) { |
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2698 gclog_or_tty->print_cr("CSet Region " HR_FORMAT ", " |
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2699 "claim value = %d, should be %d", |
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2700 HR_FORMAT_PARAMS(hr), |
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2701 hr->claim_value(), _claim_value); |
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2702 _failures += 1; |
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|
2703 } |
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|
2704 return false; |
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|
2705 } |
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|
2706 }; |
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|
2707 |
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|
2708 bool G1CollectedHeap::check_cset_heap_region_claim_values(jint claim_value) { |
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2709 CheckClaimValuesInCSetHRClosure cl(claim_value); |
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2710 collection_set_iterate(&cl); |
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2711 return cl.failures() == 0; |
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2712 } |
355 | 2713 #endif // ASSERT |
342 | 2714 |
4709
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2715 // Clear the cached CSet starting regions and (more importantly) |
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2716 // the time stamps. Called when we reset the GC time stamp. |
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2717 void G1CollectedHeap::clear_cset_start_regions() { |
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2718 assert(_worker_cset_start_region != NULL, "sanity"); |
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2719 assert(_worker_cset_start_region_time_stamp != NULL, "sanity"); |
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2720 |
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2721 int n_queues = MAX2((int)ParallelGCThreads, 1); |
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2722 for (int i = 0; i < n_queues; i++) { |
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2723 _worker_cset_start_region[i] = NULL; |
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2724 _worker_cset_start_region_time_stamp[i] = 0; |
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2725 } |
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|
2726 } |
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2727 |
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2728 // Given the id of a worker, obtain or calculate a suitable |
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2729 // starting region for iterating over the current collection set. |
4097
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2730 HeapRegion* G1CollectedHeap::start_cset_region_for_worker(int worker_i) { |
4709
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2731 assert(get_gc_time_stamp() > 0, "should have been updated by now"); |
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2732 |
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|
2733 HeapRegion* result = NULL; |
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|
2734 unsigned gc_time_stamp = get_gc_time_stamp(); |
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2735 |
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|
2736 if (_worker_cset_start_region_time_stamp[worker_i] == gc_time_stamp) { |
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2737 // Cached starting region for current worker was set |
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2738 // during the current pause - so it's valid. |
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2739 // Note: the cached starting heap region may be NULL |
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2740 // (when the collection set is empty). |
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|
2741 result = _worker_cset_start_region[worker_i]; |
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|
2742 assert(result == NULL || result->in_collection_set(), "sanity"); |
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|
2743 return result; |
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|
2744 } |
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|
2745 |
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|
2746 // The cached entry was not valid so let's calculate |
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2747 // a suitable starting heap region for this worker. |
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|
2748 |
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|
2749 // We want the parallel threads to start their collection |
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2750 // set iteration at different collection set regions to |
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|
2751 // avoid contention. |
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|
2752 // If we have: |
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|
2753 // n collection set regions |
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|
2754 // p threads |
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|
2755 // Then thread t will start at region floor ((t * n) / p) |
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|
2756 |
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|
2757 result = g1_policy()->collection_set(); |
4097
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2758 if (G1CollectedHeap::use_parallel_gc_threads()) { |
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|
2759 size_t cs_size = g1_policy()->cset_region_length(); |
4728
441e946dc1af
7121618: Change type of number of GC workers to unsigned int.
jmasa
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4711
diff
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|
2760 uint active_workers = workers()->active_workers(); |
4709
fd2b426c30db
7119908: G1: Cache CSet start region for each worker for subsequent reuse
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|
2761 assert(UseDynamicNumberOfGCThreads || |
fd2b426c30db
7119908: G1: Cache CSet start region for each worker for subsequent reuse
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diff
changeset
|
2762 active_workers == workers()->total_workers(), |
fd2b426c30db
7119908: G1: Cache CSet start region for each worker for subsequent reuse
johnc
parents:
4708
diff
changeset
|
2763 "Unless dynamic should use total workers"); |
fd2b426c30db
7119908: G1: Cache CSet start region for each worker for subsequent reuse
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parents:
4708
diff
changeset
|
2764 |
fd2b426c30db
7119908: G1: Cache CSet start region for each worker for subsequent reuse
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parents:
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diff
changeset
|
2765 size_t end_ind = (cs_size * worker_i) / active_workers; |
fd2b426c30db
7119908: G1: Cache CSet start region for each worker for subsequent reuse
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diff
changeset
|
2766 size_t start_ind = 0; |
fd2b426c30db
7119908: G1: Cache CSet start region for each worker for subsequent reuse
johnc
parents:
4708
diff
changeset
|
2767 |
fd2b426c30db
7119908: G1: Cache CSet start region for each worker for subsequent reuse
johnc
parents:
4708
diff
changeset
|
2768 if (worker_i > 0 && |
fd2b426c30db
7119908: G1: Cache CSet start region for each worker for subsequent reuse
johnc
parents:
4708
diff
changeset
|
2769 _worker_cset_start_region_time_stamp[worker_i - 1] == gc_time_stamp) { |
fd2b426c30db
7119908: G1: Cache CSet start region for each worker for subsequent reuse
johnc
parents:
4708
diff
changeset
|
2770 // Previous workers starting region is valid |
fd2b426c30db
7119908: G1: Cache CSet start region for each worker for subsequent reuse
johnc
parents:
4708
diff
changeset
|
2771 // so let's iterate from there |
fd2b426c30db
7119908: G1: Cache CSet start region for each worker for subsequent reuse
johnc
parents:
4708
diff
changeset
|
2772 start_ind = (cs_size * (worker_i - 1)) / active_workers; |
fd2b426c30db
7119908: G1: Cache CSet start region for each worker for subsequent reuse
johnc
parents:
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diff
changeset
|
2773 result = _worker_cset_start_region[worker_i - 1]; |
fd2b426c30db
7119908: G1: Cache CSet start region for each worker for subsequent reuse
johnc
parents:
4708
diff
changeset
|
2774 } |
fd2b426c30db
7119908: G1: Cache CSet start region for each worker for subsequent reuse
johnc
parents:
4708
diff
changeset
|
2775 |
fd2b426c30db
7119908: G1: Cache CSet start region for each worker for subsequent reuse
johnc
parents:
4708
diff
changeset
|
2776 for (size_t i = start_ind; i < end_ind; i++) { |
4097
dc467e8b2c5e
7112743: G1: Reduce overhead of marking closure during evacuation pauses
johnc
parents:
4095
diff
changeset
|
2777 result = result->next_in_collection_set(); |
dc467e8b2c5e
7112743: G1: Reduce overhead of marking closure during evacuation pauses
johnc
parents:
4095
diff
changeset
|
2778 } |
dc467e8b2c5e
7112743: G1: Reduce overhead of marking closure during evacuation pauses
johnc
parents:
4095
diff
changeset
|
2779 } |
4709
fd2b426c30db
7119908: G1: Cache CSet start region for each worker for subsequent reuse
johnc
parents:
4708
diff
changeset
|
2780 |
fd2b426c30db
7119908: G1: Cache CSet start region for each worker for subsequent reuse
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parents:
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diff
changeset
|
2781 // Note: the calculated starting heap region may be NULL |
fd2b426c30db
7119908: G1: Cache CSet start region for each worker for subsequent reuse
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diff
changeset
|
2782 // (when the collection set is empty). |
fd2b426c30db
7119908: G1: Cache CSet start region for each worker for subsequent reuse
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changeset
|
2783 assert(result == NULL || result->in_collection_set(), "sanity"); |
fd2b426c30db
7119908: G1: Cache CSet start region for each worker for subsequent reuse
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changeset
|
2784 assert(_worker_cset_start_region_time_stamp[worker_i] != gc_time_stamp, |
fd2b426c30db
7119908: G1: Cache CSet start region for each worker for subsequent reuse
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diff
changeset
|
2785 "should be updated only once per pause"); |
fd2b426c30db
7119908: G1: Cache CSet start region for each worker for subsequent reuse
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changeset
|
2786 _worker_cset_start_region[worker_i] = result; |
fd2b426c30db
7119908: G1: Cache CSet start region for each worker for subsequent reuse
johnc
parents:
4708
diff
changeset
|
2787 OrderAccess::storestore(); |
fd2b426c30db
7119908: G1: Cache CSet start region for each worker for subsequent reuse
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parents:
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diff
changeset
|
2788 _worker_cset_start_region_time_stamp[worker_i] = gc_time_stamp; |
4097
dc467e8b2c5e
7112743: G1: Reduce overhead of marking closure during evacuation pauses
johnc
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4095
diff
changeset
|
2789 return result; |
dc467e8b2c5e
7112743: G1: Reduce overhead of marking closure during evacuation pauses
johnc
parents:
4095
diff
changeset
|
2790 } |
dc467e8b2c5e
7112743: G1: Reduce overhead of marking closure during evacuation pauses
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|
2791 |
342 | 2792 void G1CollectedHeap::collection_set_iterate(HeapRegionClosure* cl) { |
2793 HeapRegion* r = g1_policy()->collection_set(); | |
2794 while (r != NULL) { | |
2795 HeapRegion* next = r->next_in_collection_set(); | |
2796 if (cl->doHeapRegion(r)) { | |
2797 cl->incomplete(); | |
2798 return; | |
2799 } | |
2800 r = next; | |
2801 } | |
2802 } | |
2803 | |
2804 void G1CollectedHeap::collection_set_iterate_from(HeapRegion* r, | |
2805 HeapRegionClosure *cl) { | |
1656
4e5661ba9d98
6944166: G1: explicit GCs are not always handled correctly
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diff
changeset
|
2806 if (r == NULL) { |
4e5661ba9d98
6944166: G1: explicit GCs are not always handled correctly
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diff
changeset
|
2807 // The CSet is empty so there's nothing to do. |
4e5661ba9d98
6944166: G1: explicit GCs are not always handled correctly
tonyp
parents:
1611
diff
changeset
|
2808 return; |
4e5661ba9d98
6944166: G1: explicit GCs are not always handled correctly
tonyp
parents:
1611
diff
changeset
|
2809 } |
4e5661ba9d98
6944166: G1: explicit GCs are not always handled correctly
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diff
changeset
|
2810 |
342 | 2811 assert(r->in_collection_set(), |
2812 "Start region must be a member of the collection set."); | |
2813 HeapRegion* cur = r; | |
2814 while (cur != NULL) { | |
2815 HeapRegion* next = cur->next_in_collection_set(); | |
2816 if (cl->doHeapRegion(cur) && false) { | |
2817 cl->incomplete(); | |
2818 return; | |
2819 } | |
2820 cur = next; | |
2821 } | |
2822 cur = g1_policy()->collection_set(); | |
2823 while (cur != r) { | |
2824 HeapRegion* next = cur->next_in_collection_set(); | |
2825 if (cl->doHeapRegion(cur) && false) { | |
2826 cl->incomplete(); | |
2827 return; | |
2828 } | |
2829 cur = next; | |
2830 } | |
2831 } | |
2832 | |
2833 CompactibleSpace* G1CollectedHeap::first_compactible_space() { | |
3766 | 2834 return n_regions() > 0 ? region_at(0) : NULL; |
342 | 2835 } |
2836 | |
2837 | |
2838 Space* G1CollectedHeap::space_containing(const void* addr) const { | |
2839 Space* res = heap_region_containing(addr); | |
2840 if (res == NULL) | |
2841 res = perm_gen()->space_containing(addr); | |
2842 return res; | |
2843 } | |
2844 | |
2845 HeapWord* G1CollectedHeap::block_start(const void* addr) const { | |
2846 Space* sp = space_containing(addr); | |
2847 if (sp != NULL) { | |
2848 return sp->block_start(addr); | |
2849 } | |
2850 return NULL; | |
2851 } | |
2852 | |
2853 size_t G1CollectedHeap::block_size(const HeapWord* addr) const { | |
2854 Space* sp = space_containing(addr); | |
2855 assert(sp != NULL, "block_size of address outside of heap"); | |
2856 return sp->block_size(addr); | |
2857 } | |
2858 | |
2859 bool G1CollectedHeap::block_is_obj(const HeapWord* addr) const { | |
2860 Space* sp = space_containing(addr); | |
2861 return sp->block_is_obj(addr); | |
2862 } | |
2863 | |
2864 bool G1CollectedHeap::supports_tlab_allocation() const { | |
2865 return true; | |
2866 } | |
2867 | |
2868 size_t G1CollectedHeap::tlab_capacity(Thread* ignored) const { | |
2869 return HeapRegion::GrainBytes; | |
2870 } | |
2871 | |
2872 size_t G1CollectedHeap::unsafe_max_tlab_alloc(Thread* ignored) const { | |
2873 // Return the remaining space in the cur alloc region, but not less than | |
2874 // the min TLAB size. | |
1313
664ae0c5e0e5
6755988: G1: assert(new_obj != 0 || ... "should be forwarded")
johnc
parents:
1282
diff
changeset
|
2875 |
664ae0c5e0e5
6755988: G1: assert(new_obj != 0 || ... "should be forwarded")
johnc
parents:
1282
diff
changeset
|
2876 // Also, this value can be at most the humongous object threshold, |
664ae0c5e0e5
6755988: G1: assert(new_obj != 0 || ... "should be forwarded")
johnc
parents:
1282
diff
changeset
|
2877 // since we can't allow tlabs to grow big enough to accomodate |
664ae0c5e0e5
6755988: G1: assert(new_obj != 0 || ... "should be forwarded")
johnc
parents:
1282
diff
changeset
|
2878 // humongous objects. |
664ae0c5e0e5
6755988: G1: assert(new_obj != 0 || ... "should be forwarded")
johnc
parents:
1282
diff
changeset
|
2879 |
2433
abdfc822206f
7023069: G1: Introduce symmetric locking in the slow allocation path
tonyp
parents:
2432
diff
changeset
|
2880 HeapRegion* hr = _mutator_alloc_region.get(); |
1313
664ae0c5e0e5
6755988: G1: assert(new_obj != 0 || ... "should be forwarded")
johnc
parents:
1282
diff
changeset
|
2881 size_t max_tlab_size = _humongous_object_threshold_in_words * wordSize; |
2433
abdfc822206f
7023069: G1: Introduce symmetric locking in the slow allocation path
tonyp
parents:
2432
diff
changeset
|
2882 if (hr == NULL) { |
1313
664ae0c5e0e5
6755988: G1: assert(new_obj != 0 || ... "should be forwarded")
johnc
parents:
1282
diff
changeset
|
2883 return max_tlab_size; |
342 | 2884 } else { |
2433
abdfc822206f
7023069: G1: Introduce symmetric locking in the slow allocation path
tonyp
parents:
2432
diff
changeset
|
2885 return MIN2(MAX2(hr->free(), (size_t) MinTLABSize), max_tlab_size); |
342 | 2886 } |
2887 } | |
2888 | |
2889 size_t G1CollectedHeap::max_capacity() const { | |
2188
c33825b68624
6923430: G1: assert(res != 0,"This should have worked.")
johnc
parents:
2173
diff
changeset
|
2890 return _g1_reserved.byte_size(); |
342 | 2891 } |
2892 | |
2893 jlong G1CollectedHeap::millis_since_last_gc() { | |
2894 // assert(false, "NYI"); | |
2895 return 0; | |
2896 } | |
2897 | |
2898 void G1CollectedHeap::prepare_for_verify() { | |
2899 if (SafepointSynchronize::is_at_safepoint() || ! UseTLAB) { | |
2900 ensure_parsability(false); | |
2901 } | |
2902 g1_rem_set()->prepare_for_verify(); | |
2903 } | |
2904 | |
2905 class VerifyLivenessOopClosure: public OopClosure { | |
3772
6747fd0512e0
7004681: G1: Extend marking verification to Full GCs
johnc
parents:
3766
diff
changeset
|
2906 G1CollectedHeap* _g1h; |
6747fd0512e0
7004681: G1: Extend marking verification to Full GCs
johnc
parents:
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diff
changeset
|
2907 VerifyOption _vo; |
342 | 2908 public: |
3772
6747fd0512e0
7004681: G1: Extend marking verification to Full GCs
johnc
parents:
3766
diff
changeset
|
2909 VerifyLivenessOopClosure(G1CollectedHeap* g1h, VerifyOption vo): |
6747fd0512e0
7004681: G1: Extend marking verification to Full GCs
johnc
parents:
3766
diff
changeset
|
2910 _g1h(g1h), _vo(vo) |
6747fd0512e0
7004681: G1: Extend marking verification to Full GCs
johnc
parents:
3766
diff
changeset
|
2911 { } |
845
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
ysr
parents:
838
diff
changeset
|
2912 void do_oop(narrowOop *p) { do_oop_work(p); } |
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
ysr
parents:
838
diff
changeset
|
2913 void do_oop( oop *p) { do_oop_work(p); } |
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
ysr
parents:
838
diff
changeset
|
2914 |
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
ysr
parents:
838
diff
changeset
|
2915 template <class T> void do_oop_work(T *p) { |
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
ysr
parents:
838
diff
changeset
|
2916 oop obj = oopDesc::load_decode_heap_oop(p); |
3772
6747fd0512e0
7004681: G1: Extend marking verification to Full GCs
johnc
parents:
3766
diff
changeset
|
2917 guarantee(obj == NULL || !_g1h->is_obj_dead_cond(obj, _vo), |
845
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
ysr
parents:
838
diff
changeset
|
2918 "Dead object referenced by a not dead object"); |
342 | 2919 } |
2920 }; | |
2921 | |
2922 class VerifyObjsInRegionClosure: public ObjectClosure { | |
811 | 2923 private: |
342 | 2924 G1CollectedHeap* _g1h; |
2925 size_t _live_bytes; | |
2926 HeapRegion *_hr; | |
3772
6747fd0512e0
7004681: G1: Extend marking verification to Full GCs
johnc
parents:
3766
diff
changeset
|
2927 VerifyOption _vo; |
342 | 2928 public: |
3772
6747fd0512e0
7004681: G1: Extend marking verification to Full GCs
johnc
parents:
3766
diff
changeset
|
2929 // _vo == UsePrevMarking -> use "prev" marking information, |
6747fd0512e0
7004681: G1: Extend marking verification to Full GCs
johnc
parents:
3766
diff
changeset
|
2930 // _vo == UseNextMarking -> use "next" marking information, |
6747fd0512e0
7004681: G1: Extend marking verification to Full GCs
johnc
parents:
3766
diff
changeset
|
2931 // _vo == UseMarkWord -> use mark word from object header. |
6747fd0512e0
7004681: G1: Extend marking verification to Full GCs
johnc
parents:
3766
diff
changeset
|
2932 VerifyObjsInRegionClosure(HeapRegion *hr, VerifyOption vo) |
6747fd0512e0
7004681: G1: Extend marking verification to Full GCs
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3766
diff
changeset
|
2933 : _live_bytes(0), _hr(hr), _vo(vo) { |
342 | 2934 _g1h = G1CollectedHeap::heap(); |
2935 } | |
2936 void do_object(oop o) { | |
3772
6747fd0512e0
7004681: G1: Extend marking verification to Full GCs
johnc
parents:
3766
diff
changeset
|
2937 VerifyLivenessOopClosure isLive(_g1h, _vo); |
342 | 2938 assert(o != NULL, "Huh?"); |
3772
6747fd0512e0
7004681: G1: Extend marking verification to Full GCs
johnc
parents:
3766
diff
changeset
|
2939 if (!_g1h->is_obj_dead_cond(o, _vo)) { |
6747fd0512e0
7004681: G1: Extend marking verification to Full GCs
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parents:
3766
diff
changeset
|
2940 // If the object is alive according to the mark word, |
6747fd0512e0
7004681: G1: Extend marking verification to Full GCs
johnc
parents:
3766
diff
changeset
|
2941 // then verify that the marking information agrees. |
6747fd0512e0
7004681: G1: Extend marking verification to Full GCs
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parents:
3766
diff
changeset
|
2942 // Note we can't verify the contra-positive of the |
6747fd0512e0
7004681: G1: Extend marking verification to Full GCs
johnc
parents:
3766
diff
changeset
|
2943 // above: if the object is dead (according to the mark |
6747fd0512e0
7004681: G1: Extend marking verification to Full GCs
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parents:
3766
diff
changeset
|
2944 // word), it may not be marked, or may have been marked |
6747fd0512e0
7004681: G1: Extend marking verification to Full GCs
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parents:
3766
diff
changeset
|
2945 // but has since became dead, or may have been allocated |
6747fd0512e0
7004681: G1: Extend marking verification to Full GCs
johnc
parents:
3766
diff
changeset
|
2946 // since the last marking. |
6747fd0512e0
7004681: G1: Extend marking verification to Full GCs
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3766
diff
changeset
|
2947 if (_vo == VerifyOption_G1UseMarkWord) { |
6747fd0512e0
7004681: G1: Extend marking verification to Full GCs
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parents:
3766
diff
changeset
|
2948 guarantee(!_g1h->is_obj_dead(o), "mark word and concurrent mark mismatch"); |
6747fd0512e0
7004681: G1: Extend marking verification to Full GCs
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parents:
3766
diff
changeset
|
2949 } |
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3766
diff
changeset
|
2950 |
342 | 2951 o->oop_iterate(&isLive); |
1389
5dbd9300cf9c
6943926: G1: Integer overflow during heap region verification
johnc
parents:
1388
diff
changeset
|
2952 if (!_hr->obj_allocated_since_prev_marking(o)) { |
5dbd9300cf9c
6943926: G1: Integer overflow during heap region verification
johnc
parents:
1388
diff
changeset
|
2953 size_t obj_size = o->size(); // Make sure we don't overflow |
5dbd9300cf9c
6943926: G1: Integer overflow during heap region verification
johnc
parents:
1388
diff
changeset
|
2954 _live_bytes += (obj_size * HeapWordSize); |
5dbd9300cf9c
6943926: G1: Integer overflow during heap region verification
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parents:
1388
diff
changeset
|
2955 } |
342 | 2956 } |
2957 } | |
2958 size_t live_bytes() { return _live_bytes; } | |
2959 }; | |
2960 | |
2961 class PrintObjsInRegionClosure : public ObjectClosure { | |
2962 HeapRegion *_hr; | |
2963 G1CollectedHeap *_g1; | |
2964 public: | |
2965 PrintObjsInRegionClosure(HeapRegion *hr) : _hr(hr) { | |
2966 _g1 = G1CollectedHeap::heap(); | |
2967 }; | |
2968 | |
2969 void do_object(oop o) { | |
2970 if (o != NULL) { | |
2971 HeapWord *start = (HeapWord *) o; | |
2972 size_t word_sz = o->size(); | |
2973 gclog_or_tty->print("\nPrinting obj "PTR_FORMAT" of size " SIZE_FORMAT | |
2974 " isMarkedPrev %d isMarkedNext %d isAllocSince %d\n", | |
2975 (void*) o, word_sz, | |
2976 _g1->isMarkedPrev(o), | |
2977 _g1->isMarkedNext(o), | |
2978 _hr->obj_allocated_since_prev_marking(o)); | |
2979 HeapWord *end = start + word_sz; | |
2980 HeapWord *cur; | |
2981 int *val; | |
2982 for (cur = start; cur < end; cur++) { | |
2983 val = (int *) cur; | |
2984 gclog_or_tty->print("\t "PTR_FORMAT":"PTR_FORMAT"\n", val, *val); | |
2985 } | |
2986 } | |
2987 } | |
2988 }; | |
2989 | |
2990 class VerifyRegionClosure: public HeapRegionClosure { | |
811 | 2991 private: |
3772
6747fd0512e0
7004681: G1: Extend marking verification to Full GCs
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parents:
3766
diff
changeset
|
2992 bool _allow_dirty; |
6747fd0512e0
7004681: G1: Extend marking verification to Full GCs
johnc
parents:
3766
diff
changeset
|
2993 bool _par; |
6747fd0512e0
7004681: G1: Extend marking verification to Full GCs
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parents:
3766
diff
changeset
|
2994 VerifyOption _vo; |
6747fd0512e0
7004681: G1: Extend marking verification to Full GCs
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parents:
3766
diff
changeset
|
2995 bool _failures; |
811 | 2996 public: |
3772
6747fd0512e0
7004681: G1: Extend marking verification to Full GCs
johnc
parents:
3766
diff
changeset
|
2997 // _vo == UsePrevMarking -> use "prev" marking information, |
6747fd0512e0
7004681: G1: Extend marking verification to Full GCs
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parents:
3766
diff
changeset
|
2998 // _vo == UseNextMarking -> use "next" marking information, |
6747fd0512e0
7004681: G1: Extend marking verification to Full GCs
johnc
parents:
3766
diff
changeset
|
2999 // _vo == UseMarkWord -> use mark word from object header. |
6747fd0512e0
7004681: G1: Extend marking verification to Full GCs
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3766
diff
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|
3000 VerifyRegionClosure(bool allow_dirty, bool par, VerifyOption vo) |
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3001 : _allow_dirty(allow_dirty), |
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3002 _par(par), |
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3003 _vo(vo), |
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3004 _failures(false) {} |
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3005 |
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3006 bool failures() { |
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3007 return _failures; |
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3008 } |
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3009 |
342 | 3010 bool doHeapRegion(HeapRegion* r) { |
390 | 3011 guarantee(_par || r->claim_value() == HeapRegion::InitialClaimValue, |
3012 "Should be unclaimed at verify points."); | |
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3013 if (!r->continuesHumongous()) { |
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3014 bool failures = false; |
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3015 r->verify(_allow_dirty, _vo, &failures); |
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3016 if (failures) { |
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3017 _failures = true; |
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3018 } else { |
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3019 VerifyObjsInRegionClosure not_dead_yet_cl(r, _vo); |
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3020 r->object_iterate(¬_dead_yet_cl); |
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3021 if (r->max_live_bytes() < not_dead_yet_cl.live_bytes()) { |
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3022 gclog_or_tty->print_cr("["PTR_FORMAT","PTR_FORMAT"] " |
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3023 "max_live_bytes "SIZE_FORMAT" " |
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3024 "< calculated "SIZE_FORMAT, |
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3025 r->bottom(), r->end(), |
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3026 r->max_live_bytes(), |
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3027 not_dead_yet_cl.live_bytes()); |
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3028 _failures = true; |
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3029 } |
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3030 } |
342 | 3031 } |
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3032 return false; // stop the region iteration if we hit a failure |
342 | 3033 } |
3034 }; | |
3035 | |
3036 class VerifyRootsClosure: public OopsInGenClosure { | |
3037 private: | |
3038 G1CollectedHeap* _g1h; | |
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3039 VerifyOption _vo; |
342 | 3040 bool _failures; |
3041 public: | |
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3042 // _vo == UsePrevMarking -> use "prev" marking information, |
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3043 // _vo == UseNextMarking -> use "next" marking information, |
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3044 // _vo == UseMarkWord -> use mark word from object header. |
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3045 VerifyRootsClosure(VerifyOption vo) : |
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3046 _g1h(G1CollectedHeap::heap()), |
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3047 _vo(vo), |
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3048 _failures(false) { } |
342 | 3049 |
3050 bool failures() { return _failures; } | |
3051 | |
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3052 template <class T> void do_oop_nv(T* p) { |
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3053 T heap_oop = oopDesc::load_heap_oop(p); |
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3054 if (!oopDesc::is_null(heap_oop)) { |
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3055 oop obj = oopDesc::decode_heap_oop_not_null(heap_oop); |
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3056 if (_g1h->is_obj_dead_cond(obj, _vo)) { |
342 | 3057 gclog_or_tty->print_cr("Root location "PTR_FORMAT" " |
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3058 "points to dead obj "PTR_FORMAT, p, (void*) obj); |
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3059 if (_vo == VerifyOption_G1UseMarkWord) { |
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3060 gclog_or_tty->print_cr(" Mark word: "PTR_FORMAT, (void*)(obj->mark())); |
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3061 } |
342 | 3062 obj->print_on(gclog_or_tty); |
3063 _failures = true; | |
3064 } | |
3065 } | |
3066 } | |
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3067 |
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3068 void do_oop(oop* p) { do_oop_nv(p); } |
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3069 void do_oop(narrowOop* p) { do_oop_nv(p); } |
342 | 3070 }; |
3071 | |
390 | 3072 // This is the task used for parallel heap verification. |
3073 | |
3074 class G1ParVerifyTask: public AbstractGangTask { | |
3075 private: | |
3076 G1CollectedHeap* _g1h; | |
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|
3077 bool _allow_dirty; |
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3078 VerifyOption _vo; |
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|
3079 bool _failures; |
390 | 3080 |
3081 public: | |
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3082 // _vo == UsePrevMarking -> use "prev" marking information, |
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3083 // _vo == UseNextMarking -> use "next" marking information, |
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3084 // _vo == UseMarkWord -> use mark word from object header. |
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3085 G1ParVerifyTask(G1CollectedHeap* g1h, bool allow_dirty, VerifyOption vo) : |
390 | 3086 AbstractGangTask("Parallel verify task"), |
845
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3087 _g1h(g1h), |
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3088 _allow_dirty(allow_dirty), |
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|
3089 _vo(vo), |
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|
3090 _failures(false) { } |
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|
3091 |
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|
3092 bool failures() { |
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|
3093 return _failures; |
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|
3094 } |
390 | 3095 |
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|
3096 void work(uint worker_id) { |
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|
3097 HandleMark hm; |
3772
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|
3098 VerifyRegionClosure blk(_allow_dirty, true, _vo); |
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|
3099 _g1h->heap_region_par_iterate_chunked(&blk, worker_id, |
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|
3100 _g1h->workers()->active_workers(), |
390 | 3101 HeapRegion::ParVerifyClaimValue); |
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|
3102 if (blk.failures()) { |
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|
3103 _failures = true; |
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|
3104 } |
390 | 3105 } |
3106 }; | |
3107 | |
342 | 3108 void G1CollectedHeap::verify(bool allow_dirty, bool silent) { |
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|
3109 verify(allow_dirty, silent, VerifyOption_G1UsePrevMarking); |
811 | 3110 } |
3111 | |
3112 void G1CollectedHeap::verify(bool allow_dirty, | |
3113 bool silent, | |
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|
3114 VerifyOption vo) { |
342 | 3115 if (SafepointSynchronize::is_at_safepoint() || ! UseTLAB) { |
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|
3116 if (!silent) { gclog_or_tty->print("Roots (excluding permgen) "); } |
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|
3117 VerifyRootsClosure rootsCl(vo); |
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|
3118 |
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|
3119 assert(Thread::current()->is_VM_thread(), |
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|
3120 "Expected to be executed serially by the VM thread at this point"); |
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|
3121 |
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|
3122 CodeBlobToOopClosure blobsCl(&rootsCl, /*do_marking=*/ false); |
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|
3123 |
3293
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|
3124 // We apply the relevant closures to all the oops in the |
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|
3125 // system dictionary, the string table and the code cache. |
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|
3126 const int so = SharedHeap::SO_AllClasses | SharedHeap::SO_Strings | SharedHeap::SO_CodeCache; |
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3127 |
3293
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|
3128 process_strong_roots(true, // activate StrongRootsScope |
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|
3129 true, // we set "collecting perm gen" to true, |
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|
3130 // so we don't reset the dirty cards in the perm gen. |
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|
3131 SharedHeap::ScanningOption(so), // roots scanning options |
342 | 3132 &rootsCl, |
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3133 &blobsCl, |
342 | 3134 &rootsCl); |
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|
3135 |
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|
3136 // If we're verifying after the marking phase of a Full GC then we can't |
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|
3137 // treat the perm gen as roots into the G1 heap. Some of the objects in |
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|
3138 // the perm gen may be dead and hence not marked. If one of these dead |
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|
3139 // objects is considered to be a root then we may end up with a false |
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|
3140 // "Root location <x> points to dead ob <y>" failure. |
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|
3141 if (vo != VerifyOption_G1UseMarkWord) { |
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|
3142 // Since we used "collecting_perm_gen" == true above, we will not have |
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|
3143 // checked the refs from perm into the G1-collected heap. We check those |
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|
3144 // references explicitly below. Whether the relevant cards are dirty |
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|
3145 // is checked further below in the rem set verification. |
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|
3146 if (!silent) { gclog_or_tty->print("Permgen roots "); } |
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|
3147 perm_gen()->oop_iterate(&rootsCl); |
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|
3148 } |
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|
3149 bool failures = rootsCl.failures(); |
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|
3150 |
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|
3151 if (vo != VerifyOption_G1UseMarkWord) { |
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|
3152 // If we're verifying during a full GC then the region sets |
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|
3153 // will have been torn down at the start of the GC. Therefore |
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|
3154 // verifying the region sets will fail. So we only verify |
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|
3155 // the region sets when not in a full GC. |
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|
3156 if (!silent) { gclog_or_tty->print("HeapRegionSets "); } |
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|
3157 verify_region_sets(); |
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|
3158 } |
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3159 |
2152 | 3160 if (!silent) { gclog_or_tty->print("HeapRegions "); } |
390 | 3161 if (GCParallelVerificationEnabled && ParallelGCThreads > 1) { |
3162 assert(check_heap_region_claim_values(HeapRegion::InitialClaimValue), | |
3163 "sanity check"); | |
3164 | |
3772
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3165 G1ParVerifyTask task(this, allow_dirty, vo); |
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3166 assert(UseDynamicNumberOfGCThreads || |
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3167 workers()->active_workers() == workers()->total_workers(), |
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3168 "If not dynamic should be using all the workers"); |
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3169 int n_workers = workers()->active_workers(); |
390 | 3170 set_par_threads(n_workers); |
3171 workers()->run_task(&task); | |
3172 set_par_threads(0); | |
1020
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3173 if (task.failures()) { |
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3174 failures = true; |
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3175 } |
390 | 3176 |
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3177 // Checks that the expected amount of parallel work was done. |
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3178 // The implication is that n_workers is > 0. |
390 | 3179 assert(check_heap_region_claim_values(HeapRegion::ParVerifyClaimValue), |
3180 "sanity check"); | |
3181 | |
3182 reset_heap_region_claim_values(); | |
3183 | |
3184 assert(check_heap_region_claim_values(HeapRegion::InitialClaimValue), | |
3185 "sanity check"); | |
3186 } else { | |
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3187 VerifyRegionClosure blk(allow_dirty, false, vo); |
3766 | 3188 heap_region_iterate(&blk); |
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3189 if (blk.failures()) { |
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3190 failures = true; |
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3191 } |
390 | 3192 } |
2152 | 3193 if (!silent) gclog_or_tty->print("RemSet "); |
342 | 3194 rem_set()->verify(); |
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3195 |
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3196 if (failures) { |
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3197 gclog_or_tty->print_cr("Heap:"); |
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3198 // It helps to have the per-region information in the output to |
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3199 // help us track down what went wrong. This is why we call |
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3200 // print_extended_on() instead of print_on(). |
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3201 print_extended_on(gclog_or_tty); |
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3202 gclog_or_tty->print_cr(""); |
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3203 #ifndef PRODUCT |
1044 | 3204 if (VerifyDuringGC && G1VerifyDuringGCPrintReachable) { |
1388 | 3205 concurrent_mark()->print_reachable("at-verification-failure", |
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3206 vo, false /* all */); |
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3207 } |
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3208 #endif |
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3209 gclog_or_tty->flush(); |
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|
3210 } |
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3211 guarantee(!failures, "there should not have been any failures"); |
342 | 3212 } else { |
3213 if (!silent) gclog_or_tty->print("(SKIPPING roots, heapRegions, remset) "); | |
3214 } | |
3215 } | |
3216 | |
3217 class PrintRegionClosure: public HeapRegionClosure { | |
3218 outputStream* _st; | |
3219 public: | |
3220 PrintRegionClosure(outputStream* st) : _st(st) {} | |
3221 bool doHeapRegion(HeapRegion* r) { | |
3222 r->print_on(_st); | |
3223 return false; | |
3224 } | |
3225 }; | |
3226 | |
3227 void G1CollectedHeap::print_on(outputStream* st) const { | |
838
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3228 st->print(" %-20s", "garbage-first heap"); |
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3229 st->print(" total " SIZE_FORMAT "K, used " SIZE_FORMAT "K", |
846
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3230 capacity()/K, used_unlocked()/K); |
838
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3231 st->print(" [" INTPTR_FORMAT ", " INTPTR_FORMAT ", " INTPTR_FORMAT ")", |
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3232 _g1_storage.low_boundary(), |
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3233 _g1_storage.high(), |
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3234 _g1_storage.high_boundary()); |
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3235 st->cr(); |
3986
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|
3236 st->print(" region size " SIZE_FORMAT "K, ", HeapRegion::GrainBytes / K); |
838
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3237 size_t young_regions = _young_list->length(); |
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3238 st->print(SIZE_FORMAT " young (" SIZE_FORMAT "K), ", |
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3239 young_regions, young_regions * HeapRegion::GrainBytes / K); |
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3240 size_t survivor_regions = g1_policy()->recorded_survivor_regions(); |
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3241 st->print(SIZE_FORMAT " survivors (" SIZE_FORMAT "K)", |
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3242 survivor_regions, survivor_regions * HeapRegion::GrainBytes / K); |
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3243 st->cr(); |
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3244 perm()->as_gen()->print_on(st); |
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3245 } |
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3246 |
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3247 void G1CollectedHeap::print_extended_on(outputStream* st) const { |
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3248 print_on(st); |
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|
3249 |
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3250 // Print the per-region information. |
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|
3251 st->cr(); |
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3252 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 | 3253 PrintRegionClosure blk(st); |
3766 | 3254 heap_region_iterate(&blk); |
342 | 3255 } |
3256 | |
3257 void G1CollectedHeap::print_gc_threads_on(outputStream* st) const { | |
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|
3258 if (G1CollectedHeap::use_parallel_gc_threads()) { |
1019 | 3259 workers()->print_worker_threads_on(st); |
3260 } | |
3261 _cmThread->print_on(st); | |
342 | 3262 st->cr(); |
1019 | 3263 _cm->print_worker_threads_on(st); |
3264 _cg1r->print_worker_threads_on(st); | |
342 | 3265 st->cr(); |
3266 } | |
3267 | |
3268 void G1CollectedHeap::gc_threads_do(ThreadClosure* tc) const { | |
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|
3269 if (G1CollectedHeap::use_parallel_gc_threads()) { |
342 | 3270 workers()->threads_do(tc); |
3271 } | |
3272 tc->do_thread(_cmThread); | |
794 | 3273 _cg1r->threads_do(tc); |
342 | 3274 } |
3275 | |
3276 void G1CollectedHeap::print_tracing_info() const { | |
3277 // We'll overload this to mean "trace GC pause statistics." | |
3278 if (TraceGen0Time || TraceGen1Time) { | |
3279 // The "G1CollectorPolicy" is keeping track of these stats, so delegate | |
3280 // to that. | |
3281 g1_policy()->print_tracing_info(); | |
3282 } | |
751 | 3283 if (G1SummarizeRSetStats) { |
342 | 3284 g1_rem_set()->print_summary_info(); |
3285 } | |
1282 | 3286 if (G1SummarizeConcMark) { |
342 | 3287 concurrent_mark()->print_summary_info(); |
3288 } | |
3289 g1_policy()->print_yg_surv_rate_info(); | |
3290 SpecializationStats::print(); | |
3291 } | |
3292 | |
3777
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|
3293 #ifndef PRODUCT |
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|
3294 // Helpful for debugging RSet issues. |
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|
3295 |
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|
3296 class PrintRSetsClosure : public HeapRegionClosure { |
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|
3297 private: |
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|
3298 const char* _msg; |
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|
3299 size_t _occupied_sum; |
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|
3300 |
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|
3301 public: |
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3302 bool doHeapRegion(HeapRegion* r) { |
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3303 HeapRegionRemSet* hrrs = r->rem_set(); |
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|
3304 size_t occupied = hrrs->occupied(); |
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|
3305 _occupied_sum += occupied; |
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|
3306 |
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|
3307 gclog_or_tty->print_cr("Printing RSet for region "HR_FORMAT, |
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|
3308 HR_FORMAT_PARAMS(r)); |
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|
3309 if (occupied == 0) { |
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|
3310 gclog_or_tty->print_cr(" RSet is empty"); |
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|
3311 } else { |
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|
3312 hrrs->print(); |
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|
3313 } |
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|
3314 gclog_or_tty->print_cr("----------"); |
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|
3315 return false; |
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|
3316 } |
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|
3317 |
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3318 PrintRSetsClosure(const char* msg) : _msg(msg), _occupied_sum(0) { |
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|
3319 gclog_or_tty->cr(); |
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|
3320 gclog_or_tty->print_cr("========================================"); |
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3321 gclog_or_tty->print_cr(msg); |
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|
3322 gclog_or_tty->cr(); |
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|
3323 } |
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|
3324 |
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|
3325 ~PrintRSetsClosure() { |
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|
3326 gclog_or_tty->print_cr("Occupied Sum: "SIZE_FORMAT, _occupied_sum); |
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|
3327 gclog_or_tty->print_cr("========================================"); |
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|
3328 gclog_or_tty->cr(); |
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|
3329 } |
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|
3330 }; |
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|
3331 |
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|
3332 void G1CollectedHeap::print_cset_rsets() { |
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|
3333 PrintRSetsClosure cl("Printing CSet RSets"); |
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|
3334 collection_set_iterate(&cl); |
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|
3335 } |
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|
3336 |
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|
3337 void G1CollectedHeap::print_all_rsets() { |
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|
3338 PrintRSetsClosure cl("Printing All RSets");; |
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|
3339 heap_region_iterate(&cl); |
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|
3340 } |
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|
3341 #endif // PRODUCT |
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|
3342 |
342 | 3343 G1CollectedHeap* G1CollectedHeap::heap() { |
3344 assert(_sh->kind() == CollectedHeap::G1CollectedHeap, | |
3345 "not a garbage-first heap"); | |
3346 return _g1h; | |
3347 } | |
3348 | |
3349 void G1CollectedHeap::gc_prologue(bool full /* Ignored */) { | |
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3350 // always_do_update_barrier = false; |
342 | 3351 assert(InlineCacheBuffer::is_empty(), "should have cleaned up ICBuffer"); |
3352 // Call allocation profiler | |
3353 AllocationProfiler::iterate_since_last_gc(); | |
3354 // Fill TLAB's and such | |
3355 ensure_parsability(true); | |
3356 } | |
3357 | |
3358 void G1CollectedHeap::gc_epilogue(bool full /* Ignored */) { | |
3359 // FIXME: what is this about? | |
3360 // I'm ignoring the "fill_newgen()" call if "alloc_event_enabled" | |
3361 // is set. | |
3362 COMPILER2_PRESENT(assert(DerivedPointerTable::is_empty(), | |
3363 "derived pointer present")); | |
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3364 // always_do_update_barrier = true; |
3979
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|
3365 |
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|
3366 // We have just completed a GC. Update the soft reference |
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6484982: G1: process references during evacuation pauses
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|
3367 // policy with the new heap occupancy |
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|
3368 Universe::update_heap_info_at_gc(); |
342 | 3369 } |
3370 | |
1973 | 3371 HeapWord* G1CollectedHeap::do_collection_pause(size_t word_size, |
3372 unsigned int gc_count_before, | |
3373 bool* succeeded) { | |
3374 assert_heap_not_locked_and_not_at_safepoint(); | |
342 | 3375 g1_policy()->record_stop_world_start(); |
1973 | 3376 VM_G1IncCollectionPause op(gc_count_before, |
3377 word_size, | |
3378 false, /* should_initiate_conc_mark */ | |
3379 g1_policy()->max_pause_time_ms(), | |
3380 GCCause::_g1_inc_collection_pause); | |
3381 VMThread::execute(&op); | |
3382 | |
3383 HeapWord* result = op.result(); | |
3384 bool ret_succeeded = op.prologue_succeeded() && op.pause_succeeded(); | |
3385 assert(result == NULL || ret_succeeded, | |
3386 "the result should be NULL if the VM did not succeed"); | |
3387 *succeeded = ret_succeeded; | |
3388 | |
3389 assert_heap_not_locked(); | |
3390 return result; | |
342 | 3391 } |
3392 | |
3393 void | |
3394 G1CollectedHeap::doConcurrentMark() { | |
845
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3395 MutexLockerEx x(CGC_lock, Mutex::_no_safepoint_check_flag); |
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3396 if (!_cmThread->in_progress()) { |
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|
3397 _cmThread->set_started(); |
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3398 CGC_lock->notify(); |
342 | 3399 } |
3400 } | |
3401 | |
3402 double G1CollectedHeap::predict_region_elapsed_time_ms(HeapRegion *hr, | |
3403 bool young) { | |
3404 return _g1_policy->predict_region_elapsed_time_ms(hr, young); | |
3405 } | |
3406 | |
3407 void G1CollectedHeap::check_if_region_is_too_expensive(double | |
3408 predicted_time_ms) { | |
3409 _g1_policy->check_if_region_is_too_expensive(predicted_time_ms); | |
3410 } | |
3411 | |
3412 size_t G1CollectedHeap::pending_card_num() { | |
3413 size_t extra_cards = 0; | |
3414 JavaThread *curr = Threads::first(); | |
3415 while (curr != NULL) { | |
3416 DirtyCardQueue& dcq = curr->dirty_card_queue(); | |
3417 extra_cards += dcq.size(); | |
3418 curr = curr->next(); | |
3419 } | |
3420 DirtyCardQueueSet& dcqs = JavaThread::dirty_card_queue_set(); | |
3421 size_t buffer_size = dcqs.buffer_size(); | |
3422 size_t buffer_num = dcqs.completed_buffers_num(); | |
3423 return buffer_size * buffer_num + extra_cards; | |
3424 } | |
3425 | |
3426 size_t G1CollectedHeap::max_pending_card_num() { | |
3427 DirtyCardQueueSet& dcqs = JavaThread::dirty_card_queue_set(); | |
3428 size_t buffer_size = dcqs.buffer_size(); | |
3429 size_t buffer_num = dcqs.completed_buffers_num(); | |
3430 int thread_num = Threads::number_of_threads(); | |
3431 return (buffer_num + thread_num) * buffer_size; | |
3432 } | |
3433 | |
3434 size_t G1CollectedHeap::cards_scanned() { | |
1861 | 3435 return g1_rem_set()->cardsScanned(); |
342 | 3436 } |
3437 | |
3438 void | |
3439 G1CollectedHeap::setup_surviving_young_words() { | |
3440 guarantee( _surviving_young_words == NULL, "pre-condition" ); | |
4090
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3441 size_t array_length = g1_policy()->young_cset_region_length(); |
342 | 3442 _surviving_young_words = NEW_C_HEAP_ARRAY(size_t, array_length); |
3443 if (_surviving_young_words == NULL) { | |
3444 vm_exit_out_of_memory(sizeof(size_t) * array_length, | |
3445 "Not enough space for young surv words summary."); | |
3446 } | |
3447 memset(_surviving_young_words, 0, array_length * sizeof(size_t)); | |
845
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|
3448 #ifdef ASSERT |
342 | 3449 for (size_t i = 0; i < array_length; ++i) { |
845
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3450 assert( _surviving_young_words[i] == 0, "memset above" ); |
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3451 } |
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|
3452 #endif // !ASSERT |
342 | 3453 } |
3454 | |
3455 void | |
3456 G1CollectedHeap::update_surviving_young_words(size_t* surv_young_words) { | |
3457 MutexLockerEx x(ParGCRareEvent_lock, Mutex::_no_safepoint_check_flag); | |
4090
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|
3458 size_t array_length = g1_policy()->young_cset_region_length(); |
342 | 3459 for (size_t i = 0; i < array_length; ++i) |
3460 _surviving_young_words[i] += surv_young_words[i]; | |
3461 } | |
3462 | |
3463 void | |
3464 G1CollectedHeap::cleanup_surviving_young_words() { | |
3465 guarantee( _surviving_young_words != NULL, "pre-condition" ); | |
3466 FREE_C_HEAP_ARRAY(size_t, _surviving_young_words); | |
3467 _surviving_young_words = NULL; | |
3468 } | |
3469 | |
3777
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|
3470 #ifdef ASSERT |
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|
3471 class VerifyCSetClosure: public HeapRegionClosure { |
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|
3472 public: |
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|
3473 bool doHeapRegion(HeapRegion* hr) { |
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3474 // Here we check that the CSet region's RSet is ready for parallel |
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|
3475 // iteration. The fields that we'll verify are only manipulated |
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|
3476 // when the region is part of a CSet and is collected. Afterwards, |
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|
3477 // we reset these fields when we clear the region's RSet (when the |
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|
3478 // region is freed) so they are ready when the region is |
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|
3479 // re-allocated. The only exception to this is if there's an |
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|
3480 // evacuation failure and instead of freeing the region we leave |
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|
3481 // it in the heap. In that case, we reset these fields during |
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|
3482 // evacuation failure handling. |
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|
3483 guarantee(hr->rem_set()->verify_ready_for_par_iteration(), "verification"); |
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|
3484 |
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|
3485 // Here's a good place to add any other checks we'd like to |
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diff
changeset
|
3486 // perform on CSet regions. |
1261
0414c1049f15
6923991: G1: improve scalability of RSet scanning
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diff
changeset
|
3487 return false; |
0414c1049f15
6923991: G1: improve scalability of RSet scanning
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diff
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|
3488 } |
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diff
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|
3489 }; |
3777
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|
3490 #endif // ASSERT |
1261
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|
3491 |
1709 | 3492 #if TASKQUEUE_STATS |
3493 void G1CollectedHeap::print_taskqueue_stats_hdr(outputStream* const st) { | |
3494 st->print_raw_cr("GC Task Stats"); | |
3495 st->print_raw("thr "); TaskQueueStats::print_header(1, st); st->cr(); | |
3496 st->print_raw("--- "); TaskQueueStats::print_header(2, st); st->cr(); | |
3497 } | |
3498 | |
3499 void G1CollectedHeap::print_taskqueue_stats(outputStream* const st) const { | |
3500 print_taskqueue_stats_hdr(st); | |
3501 | |
3502 TaskQueueStats totals; | |
1755
8e5955ddf8e4
6978300: G1: debug builds crash if ParallelGCThreads==0
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diff
changeset
|
3503 const int n = workers() != NULL ? workers()->total_workers() : 1; |
1709 | 3504 for (int i = 0; i < n; ++i) { |
3505 st->print("%3d ", i); task_queue(i)->stats.print(st); st->cr(); | |
3506 totals += task_queue(i)->stats; | |
3507 } | |
3508 st->print_raw("tot "); totals.print(st); st->cr(); | |
3509 | |
3510 DEBUG_ONLY(totals.verify()); | |
3511 } | |
3512 | |
3513 void G1CollectedHeap::reset_taskqueue_stats() { | |
1755
8e5955ddf8e4
6978300: G1: debug builds crash if ParallelGCThreads==0
jcoomes
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diff
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|
3514 const int n = workers() != NULL ? workers()->total_workers() : 1; |
1709 | 3515 for (int i = 0; i < n; ++i) { |
3516 task_queue(i)->stats.reset(); | |
3517 } | |
3518 } | |
3519 #endif // TASKQUEUE_STATS | |
3520 | |
1973 | 3521 bool |
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|
3522 G1CollectedHeap::do_collection_pause_at_safepoint(double target_pause_time_ms) { |
2152 | 3523 assert_at_safepoint(true /* should_be_vm_thread */); |
3524 guarantee(!is_gc_active(), "collection is not reentrant"); | |
3525 | |
1359
23b1b27ac76c
6909756: G1: guarantee(G1CollectedHeap::heap()->mark_in_progress(),"Precondition.")
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diff
changeset
|
3526 if (GC_locker::check_active_before_gc()) { |
1973 | 3527 return false; |
1359
23b1b27ac76c
6909756: G1: guarantee(G1CollectedHeap::heap()->mark_in_progress(),"Precondition.")
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diff
changeset
|
3528 } |
23b1b27ac76c
6909756: G1: guarantee(G1CollectedHeap::heap()->mark_in_progress(),"Precondition.")
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diff
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|
3529 |
2125
7246a374a9f2
6458402: 3 jvmti tests fail with CMS and +ExplicitGCInvokesConcurrent
kamg
parents:
2039
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changeset
|
3530 SvcGCMarker sgcm(SvcGCMarker::MINOR); |
2039
7c5250dbd584
6896624: G1: hotspot:::gc and hotspot:::mem-pool-gc probes are not fired
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changeset
|
3531 ResourceMark rm; |
7c5250dbd584
6896624: G1: hotspot:::gc and hotspot:::mem-pool-gc probes are not fired
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|
3532 |
838
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6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
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|
3533 if (PrintHeapAtGC) { |
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|
3534 Universe::print_heap_before_gc(); |
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|
3535 } |
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|
3536 |
4072 | 3537 HRSPhaseSetter x(HRSPhaseEvacuation); |
2152 | 3538 verify_region_sets_optional(); |
2433
abdfc822206f
7023069: G1: Introduce symmetric locking in the slow allocation path
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diff
changeset
|
3539 verify_dirty_young_regions(); |
2152 | 3540 |
838
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
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|
3541 { |
1359
23b1b27ac76c
6909756: G1: guarantee(G1CollectedHeap::heap()->mark_in_progress(),"Precondition.")
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|
3542 // This call will decide whether this pause is an initial-mark |
23b1b27ac76c
6909756: G1: guarantee(G1CollectedHeap::heap()->mark_in_progress(),"Precondition.")
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|
3543 // pause. If it is, during_initial_mark_pause() will return true |
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6909756: G1: guarantee(G1CollectedHeap::heap()->mark_in_progress(),"Precondition.")
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|
3544 // for the duration of this pause. |
23b1b27ac76c
6909756: G1: guarantee(G1CollectedHeap::heap()->mark_in_progress(),"Precondition.")
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diff
changeset
|
3545 g1_policy()->decide_on_conc_mark_initiation(); |
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6909756: G1: guarantee(G1CollectedHeap::heap()->mark_in_progress(),"Precondition.")
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|
3546 |
4710 | 3547 // We do not allow initial-mark to be piggy-backed on a mixed GC. |
3982
273b46400613
7086533: G1: assert(!_g1->is_obj_dead(obj)): We should not be preserving dead objs: g1CollectedHeap.cpp:3835
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3980
diff
changeset
|
3548 assert(!g1_policy()->during_initial_mark_pause() || |
4710 | 3549 g1_policy()->gcs_are_young(), "sanity"); |
3550 | |
3551 // We also do not allow mixed GCs during marking. | |
3552 assert(!mark_in_progress() || g1_policy()->gcs_are_young(), "sanity"); | |
3982
273b46400613
7086533: G1: assert(!_g1->is_obj_dead(obj)): We should not be preserving dead objs: g1CollectedHeap.cpp:3835
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diff
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|
3553 |
838
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6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
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|
3554 char verbose_str[128]; |
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|
3555 sprintf(verbose_str, "GC pause "); |
4710 | 3556 if (g1_policy()->gcs_are_young()) { |
3867
ff53346271fe
6814390: G1: remove the concept of non-generational G1
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diff
changeset
|
3557 strcat(verbose_str, "(young)"); |
ff53346271fe
6814390: G1: remove the concept of non-generational G1
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diff
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|
3558 } else { |
4710 | 3559 strcat(verbose_str, "(mixed)"); |
838
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|
3560 } |
1656
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changeset
|
3561 if (g1_policy()->during_initial_mark_pause()) { |
838
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6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
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|
3562 strcat(verbose_str, " (initial-mark)"); |
1656
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6944166: G1: explicit GCs are not always handled correctly
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changeset
|
3563 // We are about to start a marking cycle, so we increment the |
4e5661ba9d98
6944166: G1: explicit GCs are not always handled correctly
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diff
changeset
|
3564 // full collection counter. |
4e5661ba9d98
6944166: G1: explicit GCs are not always handled correctly
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diff
changeset
|
3565 increment_total_full_collections(); |
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|
3566 } |
838
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
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|
3567 |
0316eac49d5a
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diff
changeset
|
3568 // if PrintGCDetails is on, we'll print long statistics information |
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
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diff
changeset
|
3569 // in the collector policy code, so let's not print this as the output |
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
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changeset
|
3570 // is messy if we do. |
0316eac49d5a
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diff
changeset
|
3571 gclog_or_tty->date_stamp(PrintGC && PrintGCDateStamps); |
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
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changeset
|
3572 TraceCPUTime tcpu(PrintGCDetails, true, gclog_or_tty); |
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
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changeset
|
3573 TraceTime t(verbose_str, PrintGC && !PrintGCDetails, true, gclog_or_tty); |
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6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
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|
3574 |
3289
b52782ae3880
6946417: G1: Java VisualVM does not support G1 properly.
jmasa
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3285
diff
changeset
|
3575 TraceCollectorStats tcs(g1mm()->incremental_collection_counters()); |
3356
78542e2b5e35
7036199: Adding a notification to the implementation of GarbageCollectorMXBeans
fparain
parents:
3323
diff
changeset
|
3576 TraceMemoryManagerStats tms(false /* fullGC */, gc_cause()); |
1089
db0d5eba9d20
6815790: G1: Missing MemoryPoolMXBeans with -XX:+UseG1GC
tonyp
parents:
1088
diff
changeset
|
3577 |
2361 | 3578 // If the secondary_free_list is not empty, append it to the |
3579 // free_list. No need to wait for the cleanup operation to finish; | |
3580 // the region allocation code will check the secondary_free_list | |
3581 // and wait if necessary. If the G1StressConcRegionFreeing flag is | |
3582 // set, skip this step so that the region allocation code has to | |
3583 // get entries from the secondary_free_list. | |
2152 | 3584 if (!G1StressConcRegionFreeing) { |
2361 | 3585 append_secondary_free_list_if_not_empty_with_lock(); |
2152 | 3586 } |
838
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
parents:
811
diff
changeset
|
3587 |
3867
ff53346271fe
6814390: G1: remove the concept of non-generational G1
brutisso
parents:
3830
diff
changeset
|
3588 assert(check_young_list_well_formed(), |
ff53346271fe
6814390: G1: remove the concept of non-generational G1
brutisso
parents:
3830
diff
changeset
|
3589 "young list should be well formed"); |
838
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
parents:
811
diff
changeset
|
3590 |
4095
bca17e38de00
6593758: RFE: Enhance GC ergonomics to dynamically choose ParallelGCThreads
jmasa
parents:
4090
diff
changeset
|
3591 // 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
|
3592 // 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
|
3593 // it will be set. |
bca17e38de00
6593758: RFE: Enhance GC ergonomics to dynamically choose ParallelGCThreads
jmasa
parents:
4090
diff
changeset
|
3594 |
838
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
parents:
811
diff
changeset
|
3595 { // Call to jvmpi::post_class_unload_events must occur outside of active GC |
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
parents:
811
diff
changeset
|
3596 IsGCActiveMark x; |
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
parents:
811
diff
changeset
|
3597 |
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
parents:
811
diff
changeset
|
3598 gc_prologue(false); |
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
parents:
811
diff
changeset
|
3599 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
|
3600 increment_gc_time_stamp(); |
342 | 3601 |
838
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
parents:
811
diff
changeset
|
3602 if (VerifyBeforeGC && total_collections() >= VerifyGCStartAt) { |
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
parents:
811
diff
changeset
|
3603 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
|
3604 gclog_or_tty->print(" VerifyBeforeGC:"); |
838
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
parents:
811
diff
changeset
|
3605 prepare_for_verify(); |
3772
6747fd0512e0
7004681: G1: Extend marking verification to Full GCs
johnc
parents:
3766
diff
changeset
|
3606 Universe::verify(/* allow dirty */ false, |
6747fd0512e0
7004681: G1: Extend marking verification to Full GCs
johnc
parents:
3766
diff
changeset
|
3607 /* silent */ false, |
6747fd0512e0
7004681: G1: Extend marking verification to Full GCs
johnc
parents:
3766
diff
changeset
|
3608 /* option */ VerifyOption_G1UsePrevMarking); |
6747fd0512e0
7004681: G1: Extend marking verification to Full GCs
johnc
parents:
3766
diff
changeset
|
3609 |
838
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
parents:
811
diff
changeset
|
3610 } |
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
parents:
811
diff
changeset
|
3611 |
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
parents:
811
diff
changeset
|
3612 COMPILER2_PRESENT(DerivedPointerTable::clear()); |
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
parents:
811
diff
changeset
|
3613 |
3979
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3614 // Please see comment in g1CollectedHeap.hpp and |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3615 // G1CollectedHeap::ref_processing_init() to see how |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3616 // reference processing currently works in G1. |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3617 |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3618 // Enable discovery in the STW reference processor |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3619 ref_processor_stw()->enable_discovery(true /*verify_disabled*/, |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3620 true /*verify_no_refs*/); |
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 { |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3623 // We want to temporarily turn off discovery by the |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3624 // CM ref processor, if necessary, and turn it back on |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3625 // on again later if we do. Using a scoped |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3626 // NoRefDiscovery object will do this. |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3627 NoRefDiscovery no_cm_discovery(ref_processor_cm()); |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3628 |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3629 // 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
|
3630 // of the collection set!). |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3631 release_mutator_alloc_region(); |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3632 |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3633 // We should call this after we retire the mutator alloc |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3634 // region(s) so that all the ALLOC / RETIRE events are generated |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3635 // before the start GC event. |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3636 _hr_printer.start_gc(false /* full */, (size_t) total_collections()); |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3637 |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3638 // The elapsed time induced by the start time below deliberately elides |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3639 // the possible verification above. |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3640 double start_time_sec = os::elapsedTime(); |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3641 size_t start_used_bytes = used(); |
838
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
parents:
811
diff
changeset
|
3642 |
1394
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
3643 #if YOUNG_LIST_VERBOSE |
3979
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3644 gclog_or_tty->print_cr("\nBefore recording pause start.\nYoung_list:"); |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3645 _young_list->print(); |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3646 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
|
3647 #endif // YOUNG_LIST_VERBOSE |
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
3648 |
3979
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3649 g1_policy()->record_collection_pause_start(start_time_sec, |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3650 start_used_bytes); |
838
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
parents:
811
diff
changeset
|
3651 |
1394
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
3652 #if YOUNG_LIST_VERBOSE |
3979
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3653 gclog_or_tty->print_cr("\nAfter recording pause start.\nYoung_list:"); |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3654 _young_list->print(); |
1394
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
3655 #endif // YOUNG_LIST_VERBOSE |
342 | 3656 |
3979
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3657 if (g1_policy()->during_initial_mark_pause()) { |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3658 concurrent_mark()->checkpointRootsInitialPre(); |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3659 } |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3660 perm_gen()->save_marks(); |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3661 |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3662 // We must do this before any possible evacuation that should propagate |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3663 // marks. |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3664 if (mark_in_progress()) { |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3665 double start_time_sec = os::elapsedTime(); |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3666 |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3667 _cm->drainAllSATBBuffers(); |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3668 double finish_mark_ms = (os::elapsedTime() - start_time_sec) * 1000.0; |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3669 g1_policy()->record_satb_drain_time(finish_mark_ms); |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3670 } |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3671 // 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
|
3672 // only iterate over these. (Since evacuation may add to the mark |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3673 // stack, doing more exposes race conditions.) If no mark is in |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3674 // progress, this will be zero. |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3675 _cm->set_oops_do_bound(); |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3676 |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3677 if (mark_in_progress()) { |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3678 concurrent_mark()->newCSet(); |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3679 } |
838
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
parents:
811
diff
changeset
|
3680 |
1394
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
3681 #if YOUNG_LIST_VERBOSE |
3979
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3682 gclog_or_tty->print_cr("\nBefore choosing collection set.\nYoung_list:"); |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3683 _young_list->print(); |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3684 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
|
3685 #endif // YOUNG_LIST_VERBOSE |
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
3686 |
3979
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3687 g1_policy()->choose_collection_set(target_pause_time_ms); |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3688 |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3689 if (_hr_printer.is_active()) { |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3690 HeapRegion* hr = g1_policy()->collection_set(); |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3691 while (hr != NULL) { |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3692 G1HRPrinter::RegionType type; |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3693 if (!hr->is_young()) { |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3694 type = G1HRPrinter::Old; |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3695 } else if (hr->is_survivor()) { |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3696 type = G1HRPrinter::Survivor; |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3697 } else { |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3698 type = G1HRPrinter::Eden; |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3699 } |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3700 _hr_printer.cset(hr); |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3701 hr = hr->next_in_collection_set(); |
3778
5f6f2615433a
7049999: G1: Make the G1PrintHeapRegions output consistent and complete
tonyp
parents:
3777
diff
changeset
|
3702 } |
5f6f2615433a
7049999: G1: Make the G1PrintHeapRegions output consistent and complete
tonyp
parents:
3777
diff
changeset
|
3703 } |
3979
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3704 |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3705 // We have chosen the complete collection set. If marking is |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3706 // active then, we clear the region fields of any of the |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3707 // concurrent marking tasks whose region fields point into |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3708 // the collection set as these values will become stale. This |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3709 // will cause the owning marking threads to claim a new region |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3710 // when marking restarts. |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3711 if (mark_in_progress()) { |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3712 concurrent_mark()->reset_active_task_region_fields_in_cset(); |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3713 } |
3378
69293e516993
7041440: G1: assert(obj->is_oop_or_null(true )) failed: Error #
johnc
parents:
3377
diff
changeset
|
3714 |
3777
e8b0b0392037
7046182: G1: remove unnecessary iterations over the collection set
tonyp
parents:
3774
diff
changeset
|
3715 #ifdef ASSERT |
3979
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3716 VerifyCSetClosure cl; |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3717 collection_set_iterate(&cl); |
3777
e8b0b0392037
7046182: G1: remove unnecessary iterations over the collection set
tonyp
parents:
3774
diff
changeset
|
3718 #endif // ASSERT |
1707 | 3719 |
3979
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3720 setup_surviving_young_words(); |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3721 |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3722 // Initialize the GC alloc regions. |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3723 init_gc_alloc_regions(); |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3724 |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3725 // Actually do the work... |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3726 evacuate_collection_set(); |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3727 |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3728 free_collection_set(g1_policy()->collection_set()); |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3729 g1_policy()->clear_collection_set(); |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3730 |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3731 cleanup_surviving_young_words(); |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3732 |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3733 // Start a new incremental collection set for the next pause. |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3734 g1_policy()->start_incremental_cset_building(); |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3735 |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3736 // Clear the _cset_fast_test bitmap in anticipation of adding |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3737 // regions to the incremental collection set for the next |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3738 // evacuation pause. |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3739 clear_cset_fast_test(); |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3740 |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3741 _young_list->reset_sampled_info(); |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3742 |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3743 // Don't check the whole heap at this point as the |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3744 // GC alloc regions from this pause have been tagged |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3745 // as survivors and moved on to the survivor list. |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3746 // Survivor regions will fail the !is_young() check. |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3747 assert(check_young_list_empty(false /* check_heap */), |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3748 "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
|
3749 |
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
3750 #if YOUNG_LIST_VERBOSE |
3979
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3751 gclog_or_tty->print_cr("Before recording survivors.\nYoung List:"); |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3752 _young_list->print(); |
1394
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
3753 #endif // YOUNG_LIST_VERBOSE |
342 | 3754 |
3979
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3755 g1_policy()->record_survivor_regions(_young_list->survivor_length(), |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3756 _young_list->first_survivor_region(), |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3757 _young_list->last_survivor_region()); |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3758 |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3759 _young_list->reset_auxilary_lists(); |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3760 |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3761 if (evacuation_failed()) { |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3762 _summary_bytes_used = recalculate_used(); |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3763 } else { |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3764 // The "used" of the the collection set have already been subtracted |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3765 // when they were freed. Add in the bytes evacuated. |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3766 _summary_bytes_used += g1_policy()->bytes_copied_during_gc(); |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3767 } |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3768 |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3769 if (g1_policy()->during_initial_mark_pause()) { |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3770 concurrent_mark()->checkpointRootsInitialPost(); |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3771 set_marking_started(); |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3772 // CAUTION: after the doConcurrentMark() call below, |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3773 // the concurrent marking thread(s) could be running |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3774 // concurrently with us. Make sure that anything after |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3775 // 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
|
3776 // running. Note: of course, the actual marking work will |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3777 // not start until the safepoint itself is released in |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3778 // ConcurrentGCThread::safepoint_desynchronize(). |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3779 doConcurrentMark(); |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3780 } |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3781 |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3782 allocate_dummy_regions(); |
3285
49a67202bc67
7011855: G1: non-product flag to artificially grow the heap
tonyp
parents:
2433
diff
changeset
|
3783 |
1394
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
3784 #if YOUNG_LIST_VERBOSE |
3979
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3785 gclog_or_tty->print_cr("\nEnd of the pause.\nYoung_list:"); |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3786 _young_list->print(); |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3787 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
|
3788 #endif // YOUNG_LIST_VERBOSE |
342 | 3789 |
3979
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3790 init_mutator_alloc_region(); |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3791 |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3792 { |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3793 size_t expand_bytes = g1_policy()->expansion_amount(); |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3794 if (expand_bytes > 0) { |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3795 size_t bytes_before = capacity(); |
4785 | 3796 // No need for an ergo verbose message here, |
3797 // expansion_amount() does this when it returns a value > 0. | |
3979
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3798 if (!expand(expand_bytes)) { |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3799 // We failed to expand the heap so let's verify that |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3800 // committed/uncommitted amount match the backing store |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3801 assert(capacity() == _g1_storage.committed_size(), "committed size mismatch"); |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3802 assert(max_capacity() == _g1_storage.reserved_size(), "reserved size mismatch"); |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3803 } |
3920
af2ab04e0038
6929868: G1: introduce min / max young gen size bounds
brutisso
parents:
3919
diff
changeset
|
3804 } |
af2ab04e0038
6929868: G1: introduce min / max young gen size bounds
brutisso
parents:
3919
diff
changeset
|
3805 } |
3979
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3806 |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3807 double end_time_sec = os::elapsedTime(); |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3808 double pause_time_ms = (end_time_sec - start_time_sec) * MILLIUNITS; |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3809 g1_policy()->record_pause_time_ms(pause_time_ms); |
4711 | 3810 int active_workers = (G1CollectedHeap::use_parallel_gc_threads() ? |
3811 workers()->active_workers() : 1); | |
3812 g1_policy()->record_collection_pause_end(active_workers); | |
3979
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3813 |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3814 MemoryService::track_memory_usage(); |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3815 |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3816 // 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
|
3817 // update buffers to bring the RSets up-to-date if |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3818 // G1HRRSFlushLogBuffersOnVerify has been set. While scanning |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3819 // 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
|
3820 // regions we just allocated to (i.e., the GC alloc |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3821 // regions). However, during the last GC we called |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3822 // set_saved_mark() on all the GC alloc regions, so card |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3823 // scanning might skip the [saved_mark_word()...top()] area of |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3824 // those regions (i.e., the area we allocated objects into |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3825 // during the last GC). But it shouldn't. Given that |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3826 // saved_mark_word() is conditional on whether the GC time stamp |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3827 // 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
|
3828 // 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
|
3829 // regions and saved_mark_word() will simply return top() for |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3830 // 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
|
3831 // than iterating over the regions and fixing them. In fact, the |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3832 // GC time stamp increment here also ensures that |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3833 // saved_mark_word() will return top() between pauses, i.e., |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3834 // during concurrent refinement. So we don't need the |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3835 // is_gc_active() check to decided which top to use when |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3836 // scanning cards (see CR 7039627). |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3837 increment_gc_time_stamp(); |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3838 |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3839 if (VerifyAfterGC && total_collections() >= VerifyGCStartAt) { |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3840 HandleMark hm; // Discard invalid handles created during verification |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3841 gclog_or_tty->print(" VerifyAfterGC:"); |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3842 prepare_for_verify(); |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3843 Universe::verify(/* allow dirty */ true, |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3844 /* silent */ false, |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3845 /* option */ VerifyOption_G1UsePrevMarking); |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3846 } |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3847 |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3848 assert(!ref_processor_stw()->discovery_enabled(), "Postcondition"); |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3849 ref_processor_stw()->verify_no_references_recorded(); |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3850 |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3851 // 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
|
3852 } |
af2ab04e0038
6929868: G1: introduce min / max young gen size bounds
brutisso
parents:
3919
diff
changeset
|
3853 |
3778
5f6f2615433a
7049999: G1: Make the G1PrintHeapRegions output consistent and complete
tonyp
parents:
3777
diff
changeset
|
3854 // 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
|
3855 // 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
|
3856 // 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
|
3857 // RETIRE events are generated before the end GC event. |
5f6f2615433a
7049999: G1: Make the G1PrintHeapRegions output consistent and complete
tonyp
parents:
3777
diff
changeset
|
3858 _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
|
3859 |
3764
053d84a76d3d
7032531: G1: enhance GC logging to include more accurate eden / survivor size transitions
tonyp
parents:
3378
diff
changeset
|
3860 // 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
|
3861 g1_policy()->print_heap_transition(); |
838
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
parents:
811
diff
changeset
|
3862 |
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
parents:
811
diff
changeset
|
3863 if (mark_in_progress()) { |
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
parents:
811
diff
changeset
|
3864 concurrent_mark()->update_g1_committed(); |
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
parents:
811
diff
changeset
|
3865 } |
546
05c6d52fa7a9
6690928: Use spinning in combination with yields for workstealing termination.
jmasa
parents:
545
diff
changeset
|
3866 |
05c6d52fa7a9
6690928: Use spinning in combination with yields for workstealing termination.
jmasa
parents:
545
diff
changeset
|
3867 #ifdef TRACESPINNING |
838
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
parents:
811
diff
changeset
|
3868 ParallelTaskTerminator::print_termination_counts(); |
546
05c6d52fa7a9
6690928: Use spinning in combination with yields for workstealing termination.
jmasa
parents:
545
diff
changeset
|
3869 #endif |
342 | 3870 |
838
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
parents:
811
diff
changeset
|
3871 gc_epilogue(false); |
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
parents:
811
diff
changeset
|
3872 } |
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
parents:
811
diff
changeset
|
3873 |
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
parents:
811
diff
changeset
|
3874 if (ExitAfterGCNum > 0 && total_collections() == ExitAfterGCNum) { |
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
parents:
811
diff
changeset
|
3875 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
|
3876 print_tracing_info(); |
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
parents:
811
diff
changeset
|
3877 vm_exit(-1); |
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
parents:
811
diff
changeset
|
3878 } |
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
parents:
811
diff
changeset
|
3879 } |
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
parents:
811
diff
changeset
|
3880 |
3766 | 3881 _hrs.verify_optional(); |
2152 | 3882 verify_region_sets_optional(); |
3883 | |
1709 | 3884 TASKQUEUE_STATS_ONLY(if (ParallelGCVerbose) print_taskqueue_stats()); |
3885 TASKQUEUE_STATS_ONLY(reset_taskqueue_stats()); | |
3886 | |
838
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
parents:
811
diff
changeset
|
3887 if (PrintHeapAtGC) { |
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
parents:
811
diff
changeset
|
3888 Universe::print_heap_after_gc(); |
342 | 3889 } |
3980
8229bd737950
7075646: G1: fix inconsistencies in the monitoring data
tonyp
parents:
3979
diff
changeset
|
3890 g1mm()->update_sizes(); |
3289
b52782ae3880
6946417: G1: Java VisualVM does not support G1 properly.
jmasa
parents:
3285
diff
changeset
|
3891 |
884
83b687ce3090
6866591: G1: print update buffer processing stats more often
tonyp
parents:
883
diff
changeset
|
3892 if (G1SummarizeRSetStats && |
83b687ce3090
6866591: G1: print update buffer processing stats more often
tonyp
parents:
883
diff
changeset
|
3893 (G1SummarizeRSetStatsPeriod > 0) && |
83b687ce3090
6866591: G1: print update buffer processing stats more often
tonyp
parents:
883
diff
changeset
|
3894 (total_collections() % G1SummarizeRSetStatsPeriod == 0)) { |
83b687ce3090
6866591: G1: print update buffer processing stats more often
tonyp
parents:
883
diff
changeset
|
3895 g1_rem_set()->print_summary_info(); |
83b687ce3090
6866591: G1: print update buffer processing stats more often
tonyp
parents:
883
diff
changeset
|
3896 } |
1973 | 3897 |
3898 return true; | |
342 | 3899 } |
3900 | |
1391
79e419e5ea3b
6942253: G1: replace G1ParallelGCAllocBufferSize with YoungPLABSize and OldPLABSize
apetrusenko
parents:
1390
diff
changeset
|
3901 size_t G1CollectedHeap::desired_plab_sz(GCAllocPurpose purpose) |
79e419e5ea3b
6942253: G1: replace G1ParallelGCAllocBufferSize with YoungPLABSize and OldPLABSize
apetrusenko
parents:
1390
diff
changeset
|
3902 { |
79e419e5ea3b
6942253: G1: replace G1ParallelGCAllocBufferSize with YoungPLABSize and OldPLABSize
apetrusenko
parents:
1390
diff
changeset
|
3903 size_t gclab_word_size; |
79e419e5ea3b
6942253: G1: replace G1ParallelGCAllocBufferSize with YoungPLABSize and OldPLABSize
apetrusenko
parents:
1390
diff
changeset
|
3904 switch (purpose) { |
79e419e5ea3b
6942253: G1: replace G1ParallelGCAllocBufferSize with YoungPLABSize and OldPLABSize
apetrusenko
parents:
1390
diff
changeset
|
3905 case GCAllocForSurvived: |
79e419e5ea3b
6942253: G1: replace G1ParallelGCAllocBufferSize with YoungPLABSize and OldPLABSize
apetrusenko
parents:
1390
diff
changeset
|
3906 gclab_word_size = YoungPLABSize; |
79e419e5ea3b
6942253: G1: replace G1ParallelGCAllocBufferSize with YoungPLABSize and OldPLABSize
apetrusenko
parents:
1390
diff
changeset
|
3907 break; |
79e419e5ea3b
6942253: G1: replace G1ParallelGCAllocBufferSize with YoungPLABSize and OldPLABSize
apetrusenko
parents:
1390
diff
changeset
|
3908 case GCAllocForTenured: |
79e419e5ea3b
6942253: G1: replace G1ParallelGCAllocBufferSize with YoungPLABSize and OldPLABSize
apetrusenko
parents:
1390
diff
changeset
|
3909 gclab_word_size = OldPLABSize; |
79e419e5ea3b
6942253: G1: replace G1ParallelGCAllocBufferSize with YoungPLABSize and OldPLABSize
apetrusenko
parents:
1390
diff
changeset
|
3910 break; |
79e419e5ea3b
6942253: G1: replace G1ParallelGCAllocBufferSize with YoungPLABSize and OldPLABSize
apetrusenko
parents:
1390
diff
changeset
|
3911 default: |
79e419e5ea3b
6942253: G1: replace G1ParallelGCAllocBufferSize with YoungPLABSize and OldPLABSize
apetrusenko
parents:
1390
diff
changeset
|
3912 assert(false, "unknown GCAllocPurpose"); |
79e419e5ea3b
6942253: G1: replace G1ParallelGCAllocBufferSize with YoungPLABSize and OldPLABSize
apetrusenko
parents:
1390
diff
changeset
|
3913 gclab_word_size = OldPLABSize; |
79e419e5ea3b
6942253: G1: replace G1ParallelGCAllocBufferSize with YoungPLABSize and OldPLABSize
apetrusenko
parents:
1390
diff
changeset
|
3914 break; |
79e419e5ea3b
6942253: G1: replace G1ParallelGCAllocBufferSize with YoungPLABSize and OldPLABSize
apetrusenko
parents:
1390
diff
changeset
|
3915 } |
79e419e5ea3b
6942253: G1: replace G1ParallelGCAllocBufferSize with YoungPLABSize and OldPLABSize
apetrusenko
parents:
1390
diff
changeset
|
3916 return gclab_word_size; |
79e419e5ea3b
6942253: G1: replace G1ParallelGCAllocBufferSize with YoungPLABSize and OldPLABSize
apetrusenko
parents:
1390
diff
changeset
|
3917 } |
79e419e5ea3b
6942253: G1: replace G1ParallelGCAllocBufferSize with YoungPLABSize and OldPLABSize
apetrusenko
parents:
1390
diff
changeset
|
3918 |
2433
abdfc822206f
7023069: G1: Introduce symmetric locking in the slow allocation path
tonyp
parents:
2432
diff
changeset
|
3919 void G1CollectedHeap::init_mutator_alloc_region() { |
abdfc822206f
7023069: G1: Introduce symmetric locking in the slow allocation path
tonyp
parents:
2432
diff
changeset
|
3920 assert(_mutator_alloc_region.get() == NULL, "pre-condition"); |
abdfc822206f
7023069: G1: Introduce symmetric locking in the slow allocation path
tonyp
parents:
2432
diff
changeset
|
3921 _mutator_alloc_region.init(); |
abdfc822206f
7023069: G1: Introduce symmetric locking in the slow allocation path
tonyp
parents:
2432
diff
changeset
|
3922 } |
abdfc822206f
7023069: G1: Introduce symmetric locking in the slow allocation path
tonyp
parents:
2432
diff
changeset
|
3923 |
abdfc822206f
7023069: G1: Introduce symmetric locking in the slow allocation path
tonyp
parents:
2432
diff
changeset
|
3924 void G1CollectedHeap::release_mutator_alloc_region() { |
abdfc822206f
7023069: G1: Introduce symmetric locking in the slow allocation path
tonyp
parents:
2432
diff
changeset
|
3925 _mutator_alloc_region.release(); |
abdfc822206f
7023069: G1: Introduce symmetric locking in the slow allocation path
tonyp
parents:
2432
diff
changeset
|
3926 assert(_mutator_alloc_region.get() == NULL, "post-condition"); |
abdfc822206f
7023069: G1: Introduce symmetric locking in the slow allocation path
tonyp
parents:
2432
diff
changeset
|
3927 } |
1391
79e419e5ea3b
6942253: G1: replace G1ParallelGCAllocBufferSize with YoungPLABSize and OldPLABSize
apetrusenko
parents:
1390
diff
changeset
|
3928 |
3830
f44782f04dd4
7039627: G1: avoid BOT updates for survivor allocations and dirty survivor regions incrementally
tonyp
parents:
3824
diff
changeset
|
3929 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
|
3930 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
|
3931 |
f44782f04dd4
7039627: G1: avoid BOT updates for survivor allocations and dirty survivor regions incrementally
tonyp
parents:
3824
diff
changeset
|
3932 _survivor_gc_alloc_region.init(); |
f44782f04dd4
7039627: G1: avoid BOT updates for survivor allocations and dirty survivor regions incrementally
tonyp
parents:
3824
diff
changeset
|
3933 _old_gc_alloc_region.init(); |
f44782f04dd4
7039627: G1: avoid BOT updates for survivor allocations and dirty survivor regions incrementally
tonyp
parents:
3824
diff
changeset
|
3934 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
|
3935 _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
|
3936 |
f44782f04dd4
7039627: G1: avoid BOT updates for survivor allocations and dirty survivor regions incrementally
tonyp
parents:
3824
diff
changeset
|
3937 // 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
|
3938 // 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
|
3939 // 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
|
3940 // 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
|
3941 // 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
|
3942 // 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
|
3943 // 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
|
3944 // 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
|
3945 // 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
|
3946 if (retained_region != NULL && |
f44782f04dd4
7039627: G1: avoid BOT updates for survivor allocations and dirty survivor regions incrementally
tonyp
parents:
3824
diff
changeset
|
3947 !retained_region->in_collection_set() && |
f44782f04dd4
7039627: G1: avoid BOT updates for survivor allocations and dirty survivor regions incrementally
tonyp
parents:
3824
diff
changeset
|
3948 !(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
|
3949 !retained_region->is_empty() && |
f44782f04dd4
7039627: G1: avoid BOT updates for survivor allocations and dirty survivor regions incrementally
tonyp
parents:
3824
diff
changeset
|
3950 !retained_region->isHumongous()) { |
f44782f04dd4
7039627: G1: avoid BOT updates for survivor allocations and dirty survivor regions incrementally
tonyp
parents:
3824
diff
changeset
|
3951 retained_region->set_saved_mark(); |
4072 | 3952 // The retained region was added to the old region set when it was |
3953 // retired. We have to remove it now, since we don't allow regions | |
3954 // we allocate to in the region sets. We'll re-add it later, when | |
3955 // it's retired again. | |
3956 _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
|
3957 _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
|
3958 _hr_printer.reuse(retained_region); |
342 | 3959 } |
3960 } | |
3961 | |
3830
f44782f04dd4
7039627: G1: avoid BOT updates for survivor allocations and dirty survivor regions incrementally
tonyp
parents:
3824
diff
changeset
|
3962 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
|
3963 _survivor_gc_alloc_region.release(); |
f44782f04dd4
7039627: G1: avoid BOT updates for survivor allocations and dirty survivor regions incrementally
tonyp
parents:
3824
diff
changeset
|
3964 // 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
|
3965 // _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
|
3966 // _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
|
3967 // 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
|
3968 // condition. |
f44782f04dd4
7039627: G1: avoid BOT updates for survivor allocations and dirty survivor regions incrementally
tonyp
parents:
3824
diff
changeset
|
3969 _retained_old_gc_alloc_region = _old_gc_alloc_region.release(); |
342 | 3970 } |
3971 | |
3830
f44782f04dd4
7039627: G1: avoid BOT updates for survivor allocations and dirty survivor regions incrementally
tonyp
parents:
3824
diff
changeset
|
3972 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
|
3973 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
|
3974 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
|
3975 _retained_old_gc_alloc_region = NULL; |
342 | 3976 } |
3977 | |
3978 void G1CollectedHeap::init_for_evac_failure(OopsInHeapRegionClosure* cl) { | |
3979 _drain_in_progress = false; | |
3980 set_evac_failure_closure(cl); | |
3981 _evac_failure_scan_stack = new (ResourceObj::C_HEAP) GrowableArray<oop>(40, true); | |
3982 } | |
3983 | |
3984 void G1CollectedHeap::finalize_for_evac_failure() { | |
3985 assert(_evac_failure_scan_stack != NULL && | |
3986 _evac_failure_scan_stack->length() == 0, | |
3987 "Postcondition"); | |
3988 assert(!_drain_in_progress, "Postcondition"); | |
1045 | 3989 delete _evac_failure_scan_stack; |
342 | 3990 _evac_failure_scan_stack = NULL; |
3991 } | |
3992 | |
3993 void G1CollectedHeap::remove_self_forwarding_pointers() { | |
4783
023652e49ac0
7121496: G1: do the per-region evacuation failure handling work in parallel
johnc
parents:
4781
diff
changeset
|
3994 assert(check_cset_heap_region_claim_values(HeapRegion::InitialClaimValue), "sanity"); |
023652e49ac0
7121496: G1: do the per-region evacuation failure handling work in parallel
johnc
parents:
4781
diff
changeset
|
3995 assert(g1_policy()->assertMarkedBytesDataOK(), "Should be!"); |
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7121496: G1: do the per-region evacuation failure handling work in parallel
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3996 |
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3997 G1ParRemoveSelfForwardPtrsTask rsfp_task(this); |
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7121496: G1: do the per-region evacuation failure handling work in parallel
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|
3998 |
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|
3999 if (G1CollectedHeap::use_parallel_gc_threads()) { |
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|
4000 set_par_threads(); |
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|
4001 workers()->run_task(&rsfp_task); |
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|
4002 set_par_threads(0); |
616
4f360ec815ba
6720309: G1: don't synchronously update RSet during evacuation pauses
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diff
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|
4003 } else { |
4783
023652e49ac0
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4004 rsfp_task.work(0); |
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7121496: G1: do the per-region evacuation failure handling work in parallel
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|
4005 } |
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|
4006 |
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|
4007 assert(check_cset_heap_region_claim_values(HeapRegion::ParEvacFailureClaimValue), "sanity"); |
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4008 |
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4009 // Reset the claim values in the regions in the collection set. |
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4010 reset_cset_heap_region_claim_values(); |
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4011 |
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4012 assert(check_cset_heap_region_claim_values(HeapRegion::InitialClaimValue), "sanity"); |
342 | 4013 assert(g1_policy()->assertMarkedBytesDataOK(), "Should be!"); |
4014 | |
4015 // Now restore saved marks, if any. | |
4016 if (_objs_with_preserved_marks != NULL) { | |
4017 assert(_preserved_marks_of_objs != NULL, "Both or none."); | |
4018 guarantee(_objs_with_preserved_marks->length() == | |
4019 _preserved_marks_of_objs->length(), "Both or none."); | |
4020 for (int i = 0; i < _objs_with_preserved_marks->length(); i++) { | |
4021 oop obj = _objs_with_preserved_marks->at(i); | |
4022 markOop m = _preserved_marks_of_objs->at(i); | |
4023 obj->set_mark(m); | |
4024 } | |
4783
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4025 |
342 | 4026 // Delete the preserved marks growable arrays (allocated on the C heap). |
4027 delete _objs_with_preserved_marks; | |
4028 delete _preserved_marks_of_objs; | |
4029 _objs_with_preserved_marks = NULL; | |
4030 _preserved_marks_of_objs = NULL; | |
4031 } | |
4032 } | |
4033 | |
4034 void G1CollectedHeap::push_on_evac_failure_scan_stack(oop obj) { | |
4035 _evac_failure_scan_stack->push(obj); | |
4036 } | |
4037 | |
4038 void G1CollectedHeap::drain_evac_failure_scan_stack() { | |
4039 assert(_evac_failure_scan_stack != NULL, "precondition"); | |
4040 | |
4041 while (_evac_failure_scan_stack->length() > 0) { | |
4042 oop obj = _evac_failure_scan_stack->pop(); | |
4043 _evac_failure_closure->set_region(heap_region_containing(obj)); | |
4044 obj->oop_iterate_backwards(_evac_failure_closure); | |
4045 } | |
4046 } | |
4047 | |
4048 oop | |
4049 G1CollectedHeap::handle_evacuation_failure_par(OopsInHeapRegionClosure* cl, | |
3973
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4050 oop old, |
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|
4051 bool should_mark_root) { |
3323
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|
4052 assert(obj_in_cs(old), |
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4053 err_msg("obj: "PTR_FORMAT" should still be in the CSet", |
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|
4054 (HeapWord*) old)); |
342 | 4055 markOop m = old->mark(); |
4056 oop forward_ptr = old->forward_to_atomic(old); | |
4057 if (forward_ptr == NULL) { | |
4058 // Forward-to-self succeeded. | |
3973
663cb89032b1
7092412: G1: Some roots not marked during an initial mark that gets an evacuation failure
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|
4059 |
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7092412: G1: Some roots not marked during an initial mark that gets an evacuation failure
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|
4060 // should_mark_root will be true when this routine is called |
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|
4061 // from a root scanning closure during an initial mark pause. |
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|
4062 // In this case the thread that succeeds in self-forwarding the |
663cb89032b1
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4063 // object is also responsible for marking the object. |
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|
4064 if (should_mark_root) { |
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|
4065 assert(!oopDesc::is_null(old), "shouldn't be"); |
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|
4066 _cm->grayRoot(old); |
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|
4067 } |
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|
4068 |
342 | 4069 if (_evac_failure_closure != cl) { |
4070 MutexLockerEx x(EvacFailureStack_lock, Mutex::_no_safepoint_check_flag); | |
4071 assert(!_drain_in_progress, | |
4072 "Should only be true while someone holds the lock."); | |
4073 // Set the global evac-failure closure to the current thread's. | |
4074 assert(_evac_failure_closure == NULL, "Or locking has failed."); | |
4075 set_evac_failure_closure(cl); | |
4076 // Now do the common part. | |
4077 handle_evacuation_failure_common(old, m); | |
4078 // Reset to NULL. | |
4079 set_evac_failure_closure(NULL); | |
4080 } else { | |
4081 // The lock is already held, and this is recursive. | |
4082 assert(_drain_in_progress, "This should only be the recursive case."); | |
4083 handle_evacuation_failure_common(old, m); | |
4084 } | |
4085 return old; | |
4086 } else { | |
3323
75af3e8de182
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|
4087 // Forward-to-self failed. Either someone else managed to allocate |
75af3e8de182
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|
4088 // space for this object (old != forward_ptr) or they beat us in |
75af3e8de182
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|
4089 // self-forwarding it (old == forward_ptr). |
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|
4090 assert(old == forward_ptr || !obj_in_cs(forward_ptr), |
75af3e8de182
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|
4091 err_msg("obj: "PTR_FORMAT" forwarded to: "PTR_FORMAT" " |
75af3e8de182
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|
4092 "should not be in the CSet", |
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|
4093 (HeapWord*) old, (HeapWord*) forward_ptr)); |
342 | 4094 return forward_ptr; |
4095 } | |
4096 } | |
4097 | |
4098 void G1CollectedHeap::handle_evacuation_failure_common(oop old, markOop m) { | |
4099 set_evacuation_failed(true); | |
4100 | |
4101 preserve_mark_if_necessary(old, m); | |
4102 | |
4103 HeapRegion* r = heap_region_containing(old); | |
4104 if (!r->evacuation_failed()) { | |
4105 r->set_evacuation_failed(true); | |
3778
5f6f2615433a
7049999: G1: Make the G1PrintHeapRegions output consistent and complete
tonyp
parents:
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|
4106 _hr_printer.evac_failure(r); |
342 | 4107 } |
4108 | |
4109 push_on_evac_failure_scan_stack(old); | |
4110 | |
4111 if (!_drain_in_progress) { | |
4112 // prevent recursion in copy_to_survivor_space() | |
4113 _drain_in_progress = true; | |
4114 drain_evac_failure_scan_stack(); | |
4115 _drain_in_progress = false; | |
4116 } | |
4117 } | |
4118 | |
4119 void G1CollectedHeap::preserve_mark_if_necessary(oop obj, markOop m) { | |
2038
74ee0db180fa
6807801: CMS: could save/restore fewer header words during scavenge
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|
4120 assert(evacuation_failed(), "Oversaving!"); |
74ee0db180fa
6807801: CMS: could save/restore fewer header words during scavenge
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2037
diff
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|
4121 // We want to call the "for_promotion_failure" version only in the |
74ee0db180fa
6807801: CMS: could save/restore fewer header words during scavenge
ysr
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2037
diff
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|
4122 // case of a promotion failure. |
74ee0db180fa
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parents:
2037
diff
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|
4123 if (m->must_be_preserved_for_promotion_failure(obj)) { |
342 | 4124 if (_objs_with_preserved_marks == NULL) { |
4125 assert(_preserved_marks_of_objs == NULL, "Both or none."); | |
4126 _objs_with_preserved_marks = | |
4127 new (ResourceObj::C_HEAP) GrowableArray<oop>(40, true); | |
4128 _preserved_marks_of_objs = | |
4129 new (ResourceObj::C_HEAP) GrowableArray<markOop>(40, true); | |
4130 } | |
4131 _objs_with_preserved_marks->push(obj); | |
4132 _preserved_marks_of_objs->push(m); | |
4133 } | |
4134 } | |
4135 | |
4136 HeapWord* G1CollectedHeap::par_allocate_during_gc(GCAllocPurpose purpose, | |
4137 size_t word_size) { | |
3830
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7039627: G1: avoid BOT updates for survivor allocations and dirty survivor regions incrementally
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|
4138 if (purpose == GCAllocForSurvived) { |
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7039627: G1: avoid BOT updates for survivor allocations and dirty survivor regions incrementally
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|
4139 HeapWord* result = survivor_attempt_allocation(word_size); |
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7039627: G1: avoid BOT updates for survivor allocations and dirty survivor regions incrementally
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|
4140 if (result != NULL) { |
f44782f04dd4
7039627: G1: avoid BOT updates for survivor allocations and dirty survivor regions incrementally
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|
4141 return result; |
342 | 4142 } else { |
3830
f44782f04dd4
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diff
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|
4143 // Let's try to allocate in the old gen in case we can fit the |
f44782f04dd4
7039627: G1: avoid BOT updates for survivor allocations and dirty survivor regions incrementally
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parents:
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diff
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|
4144 // object there. |
f44782f04dd4
7039627: G1: avoid BOT updates for survivor allocations and dirty survivor regions incrementally
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diff
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|
4145 return old_attempt_allocation(word_size); |
342 | 4146 } |
3830
f44782f04dd4
7039627: G1: avoid BOT updates for survivor allocations and dirty survivor regions incrementally
tonyp
parents:
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diff
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|
4147 } else { |
f44782f04dd4
7039627: G1: avoid BOT updates for survivor allocations and dirty survivor regions incrementally
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diff
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|
4148 assert(purpose == GCAllocForTenured, "sanity"); |
f44782f04dd4
7039627: G1: avoid BOT updates for survivor allocations and dirty survivor regions incrementally
tonyp
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diff
changeset
|
4149 HeapWord* result = old_attempt_allocation(word_size); |
f44782f04dd4
7039627: G1: avoid BOT updates for survivor allocations and dirty survivor regions incrementally
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diff
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|
4150 if (result != NULL) { |
f44782f04dd4
7039627: G1: avoid BOT updates for survivor allocations and dirty survivor regions incrementally
tonyp
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diff
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|
4151 return result; |
342 | 4152 } else { |
3830
f44782f04dd4
7039627: G1: avoid BOT updates for survivor allocations and dirty survivor regions incrementally
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diff
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|
4153 // Let's try to allocate in the survivors in case we can fit the |
f44782f04dd4
7039627: G1: avoid BOT updates for survivor allocations and dirty survivor regions incrementally
tonyp
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3824
diff
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|
4154 // object there. |
f44782f04dd4
7039627: G1: avoid BOT updates for survivor allocations and dirty survivor regions incrementally
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diff
changeset
|
4155 return survivor_attempt_allocation(word_size); |
342 | 4156 } |
3830
f44782f04dd4
7039627: G1: avoid BOT updates for survivor allocations and dirty survivor regions incrementally
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diff
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|
4157 } |
f44782f04dd4
7039627: G1: avoid BOT updates for survivor allocations and dirty survivor regions incrementally
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3824
diff
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|
4158 |
f44782f04dd4
7039627: G1: avoid BOT updates for survivor allocations and dirty survivor regions incrementally
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diff
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|
4159 ShouldNotReachHere(); |
f44782f04dd4
7039627: G1: avoid BOT updates for survivor allocations and dirty survivor regions incrementally
tonyp
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diff
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|
4160 // Trying to keep some compilers happy. |
f44782f04dd4
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|
4161 return NULL; |
342 | 4162 } |
4163 | |
4164 #ifndef PRODUCT | |
4165 bool GCLabBitMapClosure::do_bit(size_t offset) { | |
4166 HeapWord* addr = _bitmap->offsetToHeapWord(offset); | |
4167 guarantee(_cm->isMarked(oop(addr)), "it should be!"); | |
4168 return true; | |
4169 } | |
4170 #endif // PRODUCT | |
4171 | |
3886
eeae91c9baba
7080389: G1: refactor marking code in evacuation pause copy closures
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|
4172 G1ParGCAllocBuffer::G1ParGCAllocBuffer(size_t gclab_word_size) : |
eeae91c9baba
7080389: G1: refactor marking code in evacuation pause copy closures
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|
4173 ParGCAllocBuffer(gclab_word_size), |
eeae91c9baba
7080389: G1: refactor marking code in evacuation pause copy closures
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diff
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|
4174 _should_mark_objects(false), |
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|
4175 _bitmap(G1CollectedHeap::heap()->reserved_region().start(), gclab_word_size), |
eeae91c9baba
7080389: G1: refactor marking code in evacuation pause copy closures
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|
4176 _retired(false) |
eeae91c9baba
7080389: G1: refactor marking code in evacuation pause copy closures
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|
4177 { |
eeae91c9baba
7080389: G1: refactor marking code in evacuation pause copy closures
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|
4178 //_should_mark_objects is set to true when G1ParCopyHelper needs to |
eeae91c9baba
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diff
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|
4179 // mark the forwarded location of an evacuated object. |
eeae91c9baba
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|
4180 // We set _should_mark_objects to true if marking is active, i.e. when we |
eeae91c9baba
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|
4181 // need to propagate a mark, or during an initial mark pause, i.e. when we |
eeae91c9baba
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diff
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|
4182 // need to mark objects immediately reachable by the roots. |
eeae91c9baba
7080389: G1: refactor marking code in evacuation pause copy closures
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diff
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|
4183 if (G1CollectedHeap::heap()->mark_in_progress() || |
eeae91c9baba
7080389: G1: refactor marking code in evacuation pause copy closures
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diff
changeset
|
4184 G1CollectedHeap::heap()->g1_policy()->during_initial_mark_pause()) { |
eeae91c9baba
7080389: G1: refactor marking code in evacuation pause copy closures
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diff
changeset
|
4185 _should_mark_objects = true; |
eeae91c9baba
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diff
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|
4186 } |
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diff
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|
4187 } |
eeae91c9baba
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diff
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|
4188 |
845
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
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diff
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|
4189 G1ParScanThreadState::G1ParScanThreadState(G1CollectedHeap* g1h, int queue_num) |
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
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diff
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|
4190 : _g1h(g1h), |
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
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diff
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|
4191 _refs(g1h->task_queue(queue_num)), |
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6700789: G1: Enable use of compressed oops with G1 heaps
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diff
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|
4192 _dcq(&g1h->dirty_card_queue_set()), |
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
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diff
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|
4193 _ct_bs((CardTableModRefBS*)_g1h->barrier_set()), |
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
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diff
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|
4194 _g1_rem(g1h->g1_rem_set()), |
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6700789: G1: Enable use of compressed oops with G1 heaps
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diff
changeset
|
4195 _hash_seed(17), _queue_num(queue_num), |
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
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parents:
838
diff
changeset
|
4196 _term_attempts(0), |
1391
79e419e5ea3b
6942253: G1: replace G1ParallelGCAllocBufferSize with YoungPLABSize and OldPLABSize
apetrusenko
parents:
1390
diff
changeset
|
4197 _surviving_alloc_buffer(g1h->desired_plab_sz(GCAllocForSurvived)), |
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4198 _tenured_alloc_buffer(g1h->desired_plab_sz(GCAllocForTenured)), |
845
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4199 _age_table(false), |
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4200 _strong_roots_time(0), _term_time(0), |
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4201 _alloc_buffer_waste(0), _undo_waste(0) |
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4202 { |
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4203 // we allocate G1YoungSurvRateNumRegions plus one entries, since |
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4204 // we "sacrifice" entry 0 to keep track of surviving bytes for |
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4205 // non-young regions (where the age is -1) |
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4206 // We also add a few elements at the beginning and at the end in |
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4207 // an attempt to eliminate cache contention |
4090
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4208 size_t real_length = 1 + _g1h->g1_policy()->young_cset_region_length(); |
845
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4209 size_t array_length = PADDING_ELEM_NUM + |
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4210 real_length + |
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4211 PADDING_ELEM_NUM; |
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4212 _surviving_young_words_base = NEW_C_HEAP_ARRAY(size_t, array_length); |
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4213 if (_surviving_young_words_base == NULL) |
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4214 vm_exit_out_of_memory(array_length * sizeof(size_t), |
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4215 "Not enough space for young surv histo."); |
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4216 _surviving_young_words = _surviving_young_words_base + PADDING_ELEM_NUM; |
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4217 memset(_surviving_young_words, 0, real_length * sizeof(size_t)); |
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4218 |
1391
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4219 _alloc_buffers[GCAllocForSurvived] = &_surviving_alloc_buffer; |
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4220 _alloc_buffers[GCAllocForTenured] = &_tenured_alloc_buffer; |
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4221 |
845
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4222 _start = os::elapsedTime(); |
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4223 } |
342 | 4224 |
1709 | 4225 void |
4226 G1ParScanThreadState::print_termination_stats_hdr(outputStream* const st) | |
4227 { | |
4228 st->print_raw_cr("GC Termination Stats"); | |
4229 st->print_raw_cr(" elapsed --strong roots-- -------termination-------" | |
4230 " ------waste (KiB)------"); | |
4231 st->print_raw_cr("thr ms ms % ms % attempts" | |
4232 " total alloc undo"); | |
4233 st->print_raw_cr("--- --------- --------- ------ --------- ------ --------" | |
4234 " ------- ------- -------"); | |
4235 } | |
4236 | |
4237 void | |
4238 G1ParScanThreadState::print_termination_stats(int i, | |
4239 outputStream* const st) const | |
4240 { | |
4241 const double elapsed_ms = elapsed_time() * 1000.0; | |
4242 const double s_roots_ms = strong_roots_time() * 1000.0; | |
4243 const double term_ms = term_time() * 1000.0; | |
4244 st->print_cr("%3d %9.2f %9.2f %6.2f " | |
4245 "%9.2f %6.2f " SIZE_FORMAT_W(8) " " | |
4246 SIZE_FORMAT_W(7) " " SIZE_FORMAT_W(7) " " SIZE_FORMAT_W(7), | |
4247 i, elapsed_ms, s_roots_ms, s_roots_ms * 100 / elapsed_ms, | |
4248 term_ms, term_ms * 100 / elapsed_ms, term_attempts(), | |
4249 (alloc_buffer_waste() + undo_waste()) * HeapWordSize / K, | |
4250 alloc_buffer_waste() * HeapWordSize / K, | |
4251 undo_waste() * HeapWordSize / K); | |
4252 } | |
4253 | |
1862
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4254 #ifdef ASSERT |
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4255 bool G1ParScanThreadState::verify_ref(narrowOop* ref) const { |
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4256 assert(ref != NULL, "invariant"); |
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4257 assert(UseCompressedOops, "sanity"); |
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4258 assert(!has_partial_array_mask(ref), err_msg("ref=" PTR_FORMAT, ref)); |
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4259 oop p = oopDesc::load_decode_heap_oop(ref); |
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4260 assert(_g1h->is_in_g1_reserved(p), |
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4261 err_msg("ref=" PTR_FORMAT " p=" PTR_FORMAT, ref, intptr_t(p))); |
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4262 return true; |
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|
4263 } |
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|
4264 |
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4265 bool G1ParScanThreadState::verify_ref(oop* ref) const { |
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4266 assert(ref != NULL, "invariant"); |
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4267 if (has_partial_array_mask(ref)) { |
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4268 // Must be in the collection set--it's already been copied. |
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4269 oop p = clear_partial_array_mask(ref); |
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4270 assert(_g1h->obj_in_cs(p), |
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4271 err_msg("ref=" PTR_FORMAT " p=" PTR_FORMAT, ref, intptr_t(p))); |
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4272 } else { |
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4273 oop p = oopDesc::load_decode_heap_oop(ref); |
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4274 assert(_g1h->is_in_g1_reserved(p), |
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|
4275 err_msg("ref=" PTR_FORMAT " p=" PTR_FORMAT, ref, intptr_t(p))); |
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|
4276 } |
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|
4277 return true; |
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|
4278 } |
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|
4279 |
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|
4280 bool G1ParScanThreadState::verify_task(StarTask ref) const { |
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4281 if (ref.is_narrow()) { |
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4282 return verify_ref((narrowOop*) ref); |
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|
4283 } else { |
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|
4284 return verify_ref((oop*) ref); |
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|
4285 } |
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|
4286 } |
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|
4287 #endif // ASSERT |
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|
4288 |
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|
4289 void G1ParScanThreadState::trim_queue() { |
3979
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6484982: G1: process references during evacuation pauses
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|
4290 assert(_evac_cl != NULL, "not set"); |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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|
4291 assert(_evac_failure_cl != NULL, "not set"); |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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|
4292 assert(_partial_scan_cl != NULL, "not set"); |
4dfb2df418f2
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|
4293 |
1862
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|
4294 StarTask ref; |
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|
4295 do { |
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|
4296 // Drain the overflow stack first, so other threads can steal. |
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|
4297 while (refs()->pop_overflow(ref)) { |
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|
4298 deal_with_reference(ref); |
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|
4299 } |
3979
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|
4300 |
1862
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|
4301 while (refs()->pop_local(ref)) { |
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|
4302 deal_with_reference(ref); |
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|
4303 } |
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|
4304 } while (!refs()->is_empty()); |
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|
4305 } |
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|
4306 |
342 | 4307 G1ParClosureSuper::G1ParClosureSuper(G1CollectedHeap* g1, G1ParScanThreadState* par_scan_state) : |
4308 _g1(g1), _g1_rem(_g1->g1_rem_set()), _cm(_g1->concurrent_mark()), | |
3886
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|
4309 _par_scan_state(par_scan_state), |
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|
4310 _during_initial_mark(_g1->g1_policy()->during_initial_mark_pause()), |
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|
4311 _mark_in_progress(_g1->mark_in_progress()) { } |
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|
4312 |
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|
4313 template <class T> void G1ParCopyHelper::mark_object(T* p) { |
eeae91c9baba
7080389: G1: refactor marking code in evacuation pause copy closures
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|
4314 // This is called from do_oop_work for objects that are not |
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|
4315 // in the collection set. Objects in the collection set |
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|
4316 // are marked after they have been evacuated. |
342 | 4317 |
845
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4318 T heap_oop = oopDesc::load_heap_oop(p); |
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|
4319 if (!oopDesc::is_null(heap_oop)) { |
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|
4320 oop obj = oopDesc::decode_heap_oop(heap_oop); |
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|
4321 HeapWord* addr = (HeapWord*)obj; |
3323
75af3e8de182
7040450: G1: assert((_g1->evacuation_failed()) || (!_g1->obj_in_cs(obj))) failed: shouldn't still be in ...
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diff
changeset
|
4322 if (_g1->is_in_g1_reserved(addr)) { |
342 | 4323 _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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|
4324 } |
342 | 4325 } |
4326 } | |
4327 | |
3973
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|
4328 oop G1ParCopyHelper::copy_to_survivor_space(oop old, bool should_mark_root, |
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|
4329 bool should_mark_copy) { |
342 | 4330 size_t word_sz = old->size(); |
4331 HeapRegion* from_region = _g1->heap_region_containing_raw(old); | |
4332 // +1 to make the -1 indexes valid... | |
4333 int young_index = from_region->young_index_in_cset()+1; | |
4334 assert( (from_region->is_young() && young_index > 0) || | |
4335 (!from_region->is_young() && young_index == 0), "invariant" ); | |
4336 G1CollectorPolicy* g1p = _g1->g1_policy(); | |
4337 markOop m = old->mark(); | |
545 | 4338 int age = m->has_displaced_mark_helper() ? m->displaced_mark_helper()->age() |
4339 : m->age(); | |
4340 GCAllocPurpose alloc_purpose = g1p->evacuation_destination(from_region, age, | |
342 | 4341 word_sz); |
4342 HeapWord* obj_ptr = _par_scan_state->allocate(alloc_purpose, word_sz); | |
4343 oop obj = oop(obj_ptr); | |
4344 | |
4345 if (obj_ptr == NULL) { | |
4346 // This will either forward-to-self, or detect that someone else has | |
4347 // installed a forwarding pointer. | |
4348 OopsInHeapRegionClosure* cl = _par_scan_state->evac_failure_closure(); | |
3973
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|
4349 return _g1->handle_evacuation_failure_par(cl, old, should_mark_root); |
342 | 4350 } |
4351 | |
526 | 4352 // We're going to allocate linearly, so might as well prefetch ahead. |
4353 Prefetch::write(obj_ptr, PrefetchCopyIntervalInBytes); | |
4354 | |
342 | 4355 oop forward_ptr = old->forward_to_atomic(obj); |
4356 if (forward_ptr == NULL) { | |
4357 Copy::aligned_disjoint_words((HeapWord*) old, obj_ptr, word_sz); | |
526 | 4358 if (g1p->track_object_age(alloc_purpose)) { |
4359 // We could simply do obj->incr_age(). However, this causes a | |
4360 // performance issue. obj->incr_age() will first check whether | |
4361 // the object has a displaced mark by checking its mark word; | |
4362 // getting the mark word from the new location of the object | |
4363 // stalls. So, given that we already have the mark word and we | |
4364 // are about to install it anyway, it's better to increase the | |
4365 // age on the mark word, when the object does not have a | |
4366 // displaced mark word. We're not expecting many objects to have | |
4367 // a displaced marked word, so that case is not optimized | |
4368 // further (it could be...) and we simply call obj->incr_age(). | |
4369 | |
4370 if (m->has_displaced_mark_helper()) { | |
4371 // in this case, we have to install the mark word first, | |
4372 // otherwise obj looks to be forwarded (the old mark word, | |
4373 // which contains the forward pointer, was copied) | |
4374 obj->set_mark(m); | |
4375 obj->incr_age(); | |
4376 } else { | |
4377 m = m->incr_age(); | |
545 | 4378 obj->set_mark(m); |
526 | 4379 } |
545 | 4380 _par_scan_state->age_table()->add(obj, word_sz); |
4381 } else { | |
4382 obj->set_mark(m); | |
526 | 4383 } |
4384 | |
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4385 // Mark the evacuated object or propagate "next" mark bit |
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|
4386 if (should_mark_copy) { |
342 | 4387 if (!use_local_bitmaps || |
4388 !_par_scan_state->alloc_buffer(alloc_purpose)->mark(obj_ptr)) { | |
4389 // if we couldn't mark it on the local bitmap (this happens when | |
4390 // the object was not allocated in the GCLab), we have to bite | |
4391 // the bullet and do the standard parallel mark | |
4392 _cm->markAndGrayObjectIfNecessary(obj); | |
4393 } | |
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|
4394 |
342 | 4395 if (_g1->isMarkedNext(old)) { |
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4396 // Unmark the object's old location so that marking |
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|
4397 // doesn't think the old object is alive. |
342 | 4398 _cm->nextMarkBitMap()->parClear((HeapWord*)old); |
4399 } | |
4400 } | |
4401 | |
4402 size_t* surv_young_words = _par_scan_state->surviving_young_words(); | |
4403 surv_young_words[young_index] += word_sz; | |
4404 | |
4405 if (obj->is_objArray() && arrayOop(obj)->length() >= ParGCArrayScanChunk) { | |
4784
02838862dec8
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|
4406 // We keep track of the next start index in the length field of |
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|
4407 // the to-space object. The actual length can be found in the |
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|
4408 // length field of the from-space object. |
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|
4409 arrayOop(obj)->set_length(0); |
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4410 oop* old_p = set_partial_array_mask(old); |
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4411 _par_scan_state->push_on_queue(old_p); |
342 | 4412 } else { |
526 | 4413 // No point in using the slower heap_region_containing() method, |
4414 // given that we know obj is in the heap. | |
4415 _scanner->set_region(_g1->heap_region_containing_raw(obj)); | |
342 | 4416 obj->oop_iterate_backwards(_scanner); |
4417 } | |
4418 } else { | |
4419 _par_scan_state->undo_allocation(alloc_purpose, obj_ptr, word_sz); | |
4420 obj = forward_ptr; | |
4421 } | |
4422 return obj; | |
4423 } | |
4424 | |
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|
4425 template <bool do_gen_barrier, G1Barrier barrier, bool do_mark_object> |
845
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4426 template <class T> |
3886
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4427 void G1ParCopyClosure<do_gen_barrier, barrier, do_mark_object> |
845
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4428 ::do_oop_work(T* p) { |
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4429 oop obj = oopDesc::load_decode_heap_oop(p); |
342 | 4430 assert(barrier != G1BarrierRS || obj != NULL, |
4431 "Precondition: G1BarrierRS implies obj is nonNull"); | |
4432 | |
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|
4433 // Marking: |
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|
4434 // If the object is in the collection set, then the thread |
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|
4435 // that copies the object should mark, or propagate the |
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|
4436 // mark to, the evacuated object. |
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|
4437 // If the object is not in the collection set then we |
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|
4438 // should call the mark_object() method depending on the |
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|
4439 // value of the template parameter do_mark_object (which will |
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|
4440 // be true for root scanning closures during an initial mark |
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|
4441 // pause). |
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|
4442 // The mark_object() method first checks whether the object |
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|
4443 // is marked and, if not, attempts to mark the object. |
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|
4444 |
526 | 4445 // here the null check is implicit in the cset_fast_test() test |
1261
0414c1049f15
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|
4446 if (_g1->in_cset_fast_test(obj)) { |
526 | 4447 if (obj->is_forwarded()) { |
845
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changeset
|
4448 oopDesc::encode_store_heap_oop(p, obj->forwardee()); |
3886
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|
4449 // If we are a root scanning closure during an initial |
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|
4450 // mark pause (i.e. do_mark_object will be true) then |
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|
4451 // we also need to handle marking of roots in the |
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|
4452 // event of an evacuation failure. In the event of an |
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|
4453 // evacuation failure, the object is forwarded to itself |
3973
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diff
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|
4454 // 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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|
4455 // object would be marked after a successful self-forward |
663cb89032b1
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|
4456 // but an object could be pointed to by both a root and non |
663cb89032b1
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|
4457 // 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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|
4458 // closure. Therefore we also have to attempt to mark the |
663cb89032b1
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|
4459 // self-forwarded root object here. |
3886
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|
4460 if (do_mark_object && obj->forwardee() == obj) { |
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|
4461 mark_object(p); |
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7080389: G1: refactor marking code in evacuation pause copy closures
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|
4462 } |
526 | 4463 } else { |
3973
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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
|
4464 // 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
|
4465 // 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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|
4466 // 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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|
4467 // 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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changeset
|
4468 // 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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changeset
|
4469 // which will pass it on to the evacuation failure handling |
663cb89032b1
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parents:
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changeset
|
4470 // 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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changeset
|
4471 // 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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|
4472 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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|
4473 |
3886
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7080389: G1: refactor marking code in evacuation pause copy closures
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changeset
|
4474 // We need to mark the copied object if we're a root scanning |
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changeset
|
4475 // closure during an initial mark pause (i.e. do_mark_object |
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changeset
|
4476 // will be true), or the object is already marked and we need |
eeae91c9baba
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diff
changeset
|
4477 // to propagate the mark to the evacuated copy. |
eeae91c9baba
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changeset
|
4478 bool should_mark_copy = do_mark_object || |
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|
4479 _during_initial_mark || |
eeae91c9baba
7080389: G1: refactor marking code in evacuation pause copy closures
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changeset
|
4480 (_mark_in_progress && !_g1->is_obj_ill(obj)); |
eeae91c9baba
7080389: G1: refactor marking code in evacuation pause copy closures
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|
4481 |
3973
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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
|
4482 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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|
4483 should_mark_copy); |
845
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changeset
|
4484 oopDesc::encode_store_heap_oop(p, copy_oop); |
342 | 4485 } |
526 | 4486 // When scanning the RS, we only care about objs in CS. |
4487 if (barrier == G1BarrierRS) { | |
616
4f360ec815ba
6720309: G1: don't synchronously update RSet during evacuation pauses
iveresov
parents:
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diff
changeset
|
4488 _par_scan_state->update_rs(_from, p, _par_scan_state->queue_num()); |
342 | 4489 } |
3886
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|
4490 } else { |
eeae91c9baba
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|
4491 // The object is not in collection set. If we're a root scanning |
eeae91c9baba
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changeset
|
4492 // closure during an initial mark pause (i.e. do_mark_object will |
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changeset
|
4493 // be true) then attempt to mark the object. |
eeae91c9baba
7080389: G1: refactor marking code in evacuation pause copy closures
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changeset
|
4494 if (do_mark_object) { |
eeae91c9baba
7080389: G1: refactor marking code in evacuation pause copy closures
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changeset
|
4495 mark_object(p); |
eeae91c9baba
7080389: G1: refactor marking code in evacuation pause copy closures
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|
4496 } |
526 | 4497 } |
4498 | |
4499 if (barrier == G1BarrierEvac && obj != NULL) { | |
616
4f360ec815ba
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iveresov
parents:
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diff
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|
4500 _par_scan_state->update_rs(_from, p, _par_scan_state->queue_num()); |
526 | 4501 } |
4502 | |
4503 if (do_gen_barrier && obj != NULL) { | |
4504 par_do_barrier(p); | |
4505 } | |
4506 } | |
4507 | |
1261
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|
4508 template void G1ParCopyClosure<false, G1BarrierEvac, false>::do_oop_work(oop* p); |
0414c1049f15
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|
4509 template void G1ParCopyClosure<false, G1BarrierEvac, false>::do_oop_work(narrowOop* p); |
845
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|
4510 |
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|
4511 template <class T> void G1ParScanPartialArrayClosure::do_oop_nv(T* p) { |
526 | 4512 assert(has_partial_array_mask(p), "invariant"); |
4784
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|
4513 oop from_obj = clear_partial_array_mask(p); |
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|
4514 |
02838862dec8
7121623: G1: always be able to reliably calculate the length of a forwarded chunked array
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changeset
|
4515 assert(Universe::heap()->is_in_reserved(from_obj), "must be in heap."); |
02838862dec8
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|
4516 assert(from_obj->is_objArray(), "must be obj array"); |
02838862dec8
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|
4517 objArrayOop from_obj_array = objArrayOop(from_obj); |
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|
4518 // The from-space object contains the real length. |
02838862dec8
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changeset
|
4519 int length = from_obj_array->length(); |
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|
4520 |
02838862dec8
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changeset
|
4521 assert(from_obj->is_forwarded(), "must be forwarded"); |
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|
4522 oop to_obj = from_obj->forwardee(); |
02838862dec8
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changeset
|
4523 assert(from_obj != to_obj, "should not be chunking self-forwarded objects"); |
02838862dec8
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changeset
|
4524 objArrayOop to_obj_array = objArrayOop(to_obj); |
02838862dec8
7121623: G1: always be able to reliably calculate the length of a forwarded chunked array
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changeset
|
4525 // We keep track of the next start index in the length field of the |
02838862dec8
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changeset
|
4526 // to-space object. |
02838862dec8
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changeset
|
4527 int next_index = to_obj_array->length(); |
02838862dec8
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changeset
|
4528 assert(0 <= next_index && next_index < length, |
02838862dec8
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diff
changeset
|
4529 err_msg("invariant, next index: %d, length: %d", next_index, length)); |
02838862dec8
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|
4530 |
02838862dec8
7121623: G1: always be able to reliably calculate the length of a forwarded chunked array
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diff
changeset
|
4531 int start = next_index; |
02838862dec8
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4783
diff
changeset
|
4532 int end = length; |
02838862dec8
7121623: G1: always be able to reliably calculate the length of a forwarded chunked array
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diff
changeset
|
4533 int remainder = end - start; |
02838862dec8
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diff
changeset
|
4534 // We'll try not to push a range that's smaller than ParGCArrayScanChunk. |
342 | 4535 if (remainder > 2 * ParGCArrayScanChunk) { |
4536 end = start + ParGCArrayScanChunk; | |
4784
02838862dec8
7121623: G1: always be able to reliably calculate the length of a forwarded chunked array
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4783
diff
changeset
|
4537 to_obj_array->set_length(end); |
02838862dec8
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changeset
|
4538 // Push the remainder before we process the range in case another |
02838862dec8
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changeset
|
4539 // worker has run out of things to do and can steal it. |
02838862dec8
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changeset
|
4540 oop* from_obj_p = set_partial_array_mask(from_obj); |
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4541 _par_scan_state->push_on_queue(from_obj_p); |
342 | 4542 } else { |
4784
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4543 assert(length == end, "sanity"); |
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4544 // We'll process the final range for this object. Restore the length |
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4545 // so that the heap remains parsable in case of evacuation failure. |
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4546 to_obj_array->set_length(end); |
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|
4547 } |
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4548 _scanner.set_region(_g1->heap_region_containing_raw(to_obj)); |
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4549 // Process indexes [start,end). It will also process the header |
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|
4550 // along with the first chunk (i.e., the chunk with start == 0). |
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4551 // Note that at this point the length field of to_obj_array is not |
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4552 // correct given that we are using it to keep track of the next |
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4553 // start index. oop_iterate_range() (thankfully!) ignores the length |
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4554 // field and only relies on the start / end parameters. It does |
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4555 // however return the size of the object which will be incorrect. So |
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4556 // we have to ignore it even if we wanted to use it. |
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4557 to_obj_array->oop_iterate_range(&_scanner, start, end); |
342 | 4558 } |
4559 | |
4560 class G1ParEvacuateFollowersClosure : public VoidClosure { | |
4561 protected: | |
4562 G1CollectedHeap* _g1h; | |
4563 G1ParScanThreadState* _par_scan_state; | |
4564 RefToScanQueueSet* _queues; | |
4565 ParallelTaskTerminator* _terminator; | |
4566 | |
4567 G1ParScanThreadState* par_scan_state() { return _par_scan_state; } | |
4568 RefToScanQueueSet* queues() { return _queues; } | |
4569 ParallelTaskTerminator* terminator() { return _terminator; } | |
4570 | |
4571 public: | |
4572 G1ParEvacuateFollowersClosure(G1CollectedHeap* g1h, | |
4573 G1ParScanThreadState* par_scan_state, | |
4574 RefToScanQueueSet* queues, | |
4575 ParallelTaskTerminator* terminator) | |
4576 : _g1h(g1h), _par_scan_state(par_scan_state), | |
4577 _queues(queues), _terminator(terminator) {} | |
4578 | |
1862
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4579 void do_void(); |
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4580 |
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4581 private: |
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|
4582 inline bool offer_termination(); |
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|
4583 }; |
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|
4584 |
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4585 bool G1ParEvacuateFollowersClosure::offer_termination() { |
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4586 G1ParScanThreadState* const pss = par_scan_state(); |
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4587 pss->start_term_time(); |
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4588 const bool res = terminator()->offer_termination(); |
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4589 pss->end_term_time(); |
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|
4590 return res; |
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|
4591 } |
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|
4592 |
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|
4593 void G1ParEvacuateFollowersClosure::do_void() { |
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|
4594 StarTask stolen_task; |
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|
4595 G1ParScanThreadState* const pss = par_scan_state(); |
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|
4596 pss->trim_queue(); |
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|
4597 |
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|
4598 do { |
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|
4599 while (queues()->steal(pss->queue_num(), pss->hash_seed(), stolen_task)) { |
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4600 assert(pss->verify_task(stolen_task), "sanity"); |
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4601 if (stolen_task.is_narrow()) { |
1883
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4602 pss->deal_with_reference((narrowOop*) stolen_task); |
1862
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4603 } else { |
1883
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4604 pss->deal_with_reference((oop*) stolen_task); |
1862
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|
4605 } |
1883
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|
4606 |
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|
4607 // We've just processed a reference and we might have made |
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4608 // available new entries on the queues. So we have to make sure |
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|
4609 // we drain the queues as necessary. |
342 | 4610 pss->trim_queue(); |
4611 } | |
1862
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|
4612 } while (!offer_termination()); |
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|
4613 |
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|
4614 pss->retire_alloc_buffers(); |
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|
4615 } |
342 | 4616 |
4617 class G1ParTask : public AbstractGangTask { | |
4618 protected: | |
4619 G1CollectedHeap* _g1h; | |
4620 RefToScanQueueSet *_queues; | |
4621 ParallelTaskTerminator _terminator; | |
4728
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|
4622 uint _n_workers; |
342 | 4623 |
4624 Mutex _stats_lock; | |
4625 Mutex* stats_lock() { return &_stats_lock; } | |
4626 | |
4627 size_t getNCards() { | |
4628 return (_g1h->capacity() + G1BlockOffsetSharedArray::N_bytes - 1) | |
4629 / G1BlockOffsetSharedArray::N_bytes; | |
4630 } | |
4631 | |
4632 public: | |
4095
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|
4633 G1ParTask(G1CollectedHeap* g1h, |
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|
4634 RefToScanQueueSet *task_queues) |
342 | 4635 : AbstractGangTask("G1 collection"), |
4636 _g1h(g1h), | |
4637 _queues(task_queues), | |
4095
bca17e38de00
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|
4638 _terminator(0, _queues), |
bca17e38de00
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|
4639 _stats_lock(Mutex::leaf, "parallel G1 stats lock", true) |
342 | 4640 {} |
4641 | |
4642 RefToScanQueueSet* queues() { return _queues; } | |
4643 | |
4644 RefToScanQueue *work_queue(int i) { | |
4645 return queues()->queue(i); | |
4646 } | |
4647 | |
4095
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|
4648 ParallelTaskTerminator* terminator() { return &_terminator; } |
bca17e38de00
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|
4649 |
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|
4650 virtual void set_for_termination(int active_workers) { |
bca17e38de00
6593758: RFE: Enhance GC ergonomics to dynamically choose ParallelGCThreads
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|
4651 // This task calls set_n_termination() in par_non_clean_card_iterate_work() |
bca17e38de00
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|
4652 // in the young space (_par_seq_tasks) in the G1 heap |
bca17e38de00
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|
4653 // for SequentialSubTasksDone. |
bca17e38de00
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|
4654 // This task also uses SubTasksDone in SharedHeap and G1CollectedHeap |
bca17e38de00
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|
4655 // both of which need setting by set_n_termination(). |
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|
4656 _g1h->SharedHeap::set_n_termination(active_workers); |
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|
4657 _g1h->set_n_termination(active_workers); |
bca17e38de00
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|
4658 terminator()->reset_for_reuse(active_workers); |
bca17e38de00
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|
4659 _n_workers = active_workers; |
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jmasa
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|
4660 } |
bca17e38de00
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|
4661 |
4728
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7121618: Change type of number of GC workers to unsigned int.
jmasa
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diff
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|
4662 void work(uint worker_id) { |
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7121618: Change type of number of GC workers to unsigned int.
jmasa
parents:
4711
diff
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|
4663 if (worker_id >= _n_workers) return; // no work needed this round |
1611 | 4664 |
4665 double start_time_ms = os::elapsedTime() * 1000.0; | |
4728
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jmasa
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diff
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|
4666 _g1h->g1_policy()->record_gc_worker_start_time(worker_id, start_time_ms); |
1611 | 4667 |
342 | 4668 ResourceMark rm; |
4669 HandleMark hm; | |
4670 | |
3979
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
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|
4671 ReferenceProcessor* rp = _g1h->ref_processor_stw(); |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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|
4672 |
4728
441e946dc1af
7121618: Change type of number of GC workers to unsigned int.
jmasa
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diff
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|
4673 G1ParScanThreadState pss(_g1h, worker_id); |
3979
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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diff
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|
4674 G1ParScanHeapEvacClosure scan_evac_cl(_g1h, &pss, rp); |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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|
4675 G1ParScanHeapEvacFailureClosure evac_failure_cl(_g1h, &pss, rp); |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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|
4676 G1ParScanPartialArrayClosure partial_scan_cl(_g1h, &pss, rp); |
342 | 4677 |
4678 pss.set_evac_closure(&scan_evac_cl); | |
4679 pss.set_evac_failure_closure(&evac_failure_cl); | |
4680 pss.set_partial_scan_closure(&partial_scan_cl); | |
4681 | |
3979
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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|
4682 G1ParScanExtRootClosure only_scan_root_cl(_g1h, &pss, rp); |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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|
4683 G1ParScanPermClosure only_scan_perm_cl(_g1h, &pss, rp); |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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|
4684 |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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|
4685 G1ParScanAndMarkExtRootClosure scan_mark_root_cl(_g1h, &pss, rp); |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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|
4686 G1ParScanAndMarkPermClosure scan_mark_perm_cl(_g1h, &pss, rp); |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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|
4687 |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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|
4688 OopClosure* scan_root_cl = &only_scan_root_cl; |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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|
4689 OopsInHeapRegionClosure* scan_perm_cl = &only_scan_perm_cl; |
342 | 4690 |
1359
23b1b27ac76c
6909756: G1: guarantee(G1CollectedHeap::heap()->mark_in_progress(),"Precondition.")
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1313
diff
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|
4691 if (_g1h->g1_policy()->during_initial_mark_pause()) { |
3979
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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3973
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|
4692 // We also need to mark copied objects. |
342 | 4693 scan_root_cl = &scan_mark_root_cl; |
4694 scan_perm_cl = &scan_mark_perm_cl; | |
4695 } | |
4696 | |
3983
811ec3d0833b
7097053: G1: assert(da ? referent->is_oop() : referent->is_oop_or_null()) failed: referenceProcessor.cpp:1054
johnc
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3982
diff
changeset
|
4697 G1ParPushHeapRSClosure push_heap_rs_cl(_g1h, &pss); |
3979
4dfb2df418f2
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|
4698 |
342 | 4699 pss.start_strong_roots(); |
4700 _g1h->g1_process_strong_roots(/* not collecting perm */ false, | |
4701 SharedHeap::SO_AllClasses, | |
4702 scan_root_cl, | |
1261
0414c1049f15
6923991: G1: improve scalability of RSet scanning
iveresov
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1245
diff
changeset
|
4703 &push_heap_rs_cl, |
342 | 4704 scan_perm_cl, |
4728
441e946dc1af
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jmasa
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|
4705 worker_id); |
342 | 4706 pss.end_strong_roots(); |
3823
14a2fd14c0db
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3778
diff
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|
4707 |
342 | 4708 { |
4709 double start = os::elapsedTime(); | |
4710 G1ParEvacuateFollowersClosure evac(_g1h, &pss, _queues, &_terminator); | |
4711 evac.do_void(); | |
4712 double elapsed_ms = (os::elapsedTime()-start)*1000.0; | |
4713 double term_ms = pss.term_time()*1000.0; | |
4728
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|
4714 _g1h->g1_policy()->record_obj_copy_time(worker_id, elapsed_ms-term_ms); |
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|
4715 _g1h->g1_policy()->record_termination(worker_id, term_ms, pss.term_attempts()); |
342 | 4716 } |
1282 | 4717 _g1h->g1_policy()->record_thread_age_table(pss.age_table()); |
342 | 4718 _g1h->update_surviving_young_words(pss.surviving_young_words()+1); |
4719 | |
4720 // Clean up any par-expanded rem sets. | |
4721 HeapRegionRemSet::par_cleanup(); | |
4722 | |
4723 if (ParallelGCVerbose) { | |
1709 | 4724 MutexLocker x(stats_lock()); |
4728
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7121618: Change type of number of GC workers to unsigned int.
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4711
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|
4725 pss.print_termination_stats(worker_id); |
342 | 4726 } |
4727 | |
1862
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4728 assert(pss.refs()->is_empty(), "should be empty"); |
1611 | 4729 double end_time_ms = os::elapsedTime() * 1000.0; |
4728
441e946dc1af
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|
4730 _g1h->g1_policy()->record_gc_worker_end_time(worker_id, end_time_ms); |
342 | 4731 } |
4732 }; | |
4733 | |
4734 // *** Common G1 Evacuation Stuff | |
4735 | |
1833
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|
4736 // This method is run in a GC worker. |
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4737 |
342 | 4738 void |
4739 G1CollectedHeap:: | |
4740 g1_process_strong_roots(bool collecting_perm_gen, | |
4741 SharedHeap::ScanningOption so, | |
4742 OopClosure* scan_non_heap_roots, | |
4743 OopsInHeapRegionClosure* scan_rs, | |
4744 OopsInGenClosure* scan_perm, | |
4745 int worker_i) { | |
3979
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4746 |
342 | 4747 // First scan the strong roots, including the perm gen. |
4748 double ext_roots_start = os::elapsedTime(); | |
4749 double closure_app_time_sec = 0.0; | |
4750 | |
4751 BufferingOopClosure buf_scan_non_heap_roots(scan_non_heap_roots); | |
4752 BufferingOopsInGenClosure buf_scan_perm(scan_perm); | |
4753 buf_scan_perm.set_generation(perm_gen()); | |
4754 | |
989
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4755 // Walk the code cache w/o buffering, because StarTask cannot handle |
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4756 // unaligned oop locations. |
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|
4757 CodeBlobToOopClosure eager_scan_code_roots(scan_non_heap_roots, /*do_marking=*/ true); |
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4758 |
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4759 process_strong_roots(false, // no scoping; this is parallel code |
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4760 collecting_perm_gen, so, |
342 | 4761 &buf_scan_non_heap_roots, |
989
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|
4762 &eager_scan_code_roots, |
342 | 4763 &buf_scan_perm); |
1394
1316cec51b4d
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|
4764 |
3979
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4765 // Now the CM ref_processor roots. |
3823
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|
4766 if (!_process_strong_tasks->is_task_claimed(G1H_PS_refProcessor_oops_do)) { |
3979
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4767 // We need to treat the discovered reference lists of the |
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4768 // concurrent mark ref processor as roots and keep entries |
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4769 // (which are added by the marking threads) on them live |
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4770 // until they can be processed at the end of marking. |
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|
4771 ref_processor_cm()->weak_oops_do(&buf_scan_non_heap_roots); |
3823
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|
4772 } |
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4773 |
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|
4774 // Finish up any enqueued closure apps (attributed as object copy time). |
342 | 4775 buf_scan_non_heap_roots.done(); |
4776 buf_scan_perm.done(); | |
3823
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4777 |
342 | 4778 double ext_roots_end = os::elapsedTime(); |
3823
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4779 |
342 | 4780 g1_policy()->reset_obj_copy_time(worker_i); |
3823
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4781 double obj_copy_time_sec = buf_scan_perm.closure_app_seconds() + |
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|
4782 buf_scan_non_heap_roots.closure_app_seconds(); |
342 | 4783 g1_policy()->record_obj_copy_time(worker_i, obj_copy_time_sec * 1000.0); |
3823
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|
4784 |
342 | 4785 double ext_root_time_ms = |
4786 ((ext_roots_end - ext_roots_start) - obj_copy_time_sec) * 1000.0; | |
3823
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|
4787 |
342 | 4788 g1_policy()->record_ext_root_scan_time(worker_i, ext_root_time_ms); |
4789 | |
4790 // Scan strong roots in mark stack. | |
4791 if (!_process_strong_tasks->is_task_claimed(G1H_PS_mark_stack_oops_do)) { | |
4792 concurrent_mark()->oops_do(scan_non_heap_roots); | |
4793 } | |
4794 double mark_stack_scan_ms = (os::elapsedTime() - ext_roots_end) * 1000.0; | |
4795 g1_policy()->record_mark_stack_scan_time(worker_i, mark_stack_scan_ms); | |
4796 | |
4797 // Now scan the complement of the collection set. | |
4798 if (scan_rs != NULL) { | |
4799 g1_rem_set()->oops_into_collection_set_do(scan_rs, worker_i); | |
4800 } | |
3823
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|
4801 |
342 | 4802 _process_strong_tasks->all_tasks_completed(); |
4803 } | |
4804 | |
4805 void | |
4806 G1CollectedHeap::g1_process_weak_roots(OopClosure* root_closure, | |
4807 OopClosure* non_root_closure) { | |
989
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4808 CodeBlobToOopClosure roots_in_blobs(root_closure, /*do_marking=*/ false); |
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|
4809 SharedHeap::process_weak_roots(root_closure, &roots_in_blobs, non_root_closure); |
342 | 4810 } |
4811 | |
3979
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|
4812 // Weak Reference Processing support |
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|
4813 |
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|
4814 // An always "is_alive" closure that is used to preserve referents. |
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|
4815 // If the object is non-null then it's alive. Used in the preservation |
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|
4816 // of referent objects that are pointed to by reference objects |
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|
4817 // discovered by the CM ref processor. |
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|
4818 class G1AlwaysAliveClosure: public BoolObjectClosure { |
4dfb2df418f2
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|
4819 G1CollectedHeap* _g1; |
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|
4820 public: |
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|
4821 G1AlwaysAliveClosure(G1CollectedHeap* g1) : _g1(g1) {} |
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|
4822 void do_object(oop p) { assert(false, "Do not call."); } |
4dfb2df418f2
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|
4823 bool do_object_b(oop p) { |
4dfb2df418f2
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diff
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|
4824 if (p != NULL) { |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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diff
changeset
|
4825 return true; |
4dfb2df418f2
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diff
changeset
|
4826 } |
4dfb2df418f2
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diff
changeset
|
4827 return false; |
4dfb2df418f2
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diff
changeset
|
4828 } |
4dfb2df418f2
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diff
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|
4829 }; |
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diff
changeset
|
4830 |
4dfb2df418f2
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|
4831 bool G1STWIsAliveClosure::do_object_b(oop p) { |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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parents:
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diff
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|
4832 // 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
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|
4833 // or is inside and copied. |
4dfb2df418f2
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|
4834 return !_g1->obj_in_cs(p) || p->is_forwarded(); |
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|
4835 } |
4dfb2df418f2
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diff
changeset
|
4836 |
4dfb2df418f2
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|
4837 // Non Copying Keep Alive closure |
4dfb2df418f2
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|
4838 class G1KeepAliveClosure: public OopClosure { |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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diff
changeset
|
4839 G1CollectedHeap* _g1; |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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diff
changeset
|
4840 public: |
4dfb2df418f2
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diff
changeset
|
4841 G1KeepAliveClosure(G1CollectedHeap* g1) : _g1(g1) {} |
4dfb2df418f2
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|
4842 void do_oop(narrowOop* p) { guarantee(false, "Not needed"); } |
4dfb2df418f2
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changeset
|
4843 void do_oop( oop* p) { |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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diff
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|
4844 oop obj = *p; |
4dfb2df418f2
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diff
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|
4845 |
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|
4846 if (_g1->obj_in_cs(obj)) { |
4dfb2df418f2
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|
4847 assert( obj->is_forwarded(), "invariant" ); |
4dfb2df418f2
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changeset
|
4848 *p = obj->forwardee(); |
4dfb2df418f2
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diff
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|
4849 } |
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diff
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|
4850 } |
4dfb2df418f2
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|
4851 }; |
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|
4852 |
4dfb2df418f2
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|
4853 // Copying Keep Alive closure - can be called from both |
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|
4854 // serial and parallel code as long as different worker |
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diff
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|
4855 // threads utilize different G1ParScanThreadState instances |
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diff
changeset
|
4856 // and different queues. |
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|
4857 |
4dfb2df418f2
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|
4858 class G1CopyingKeepAliveClosure: public OopClosure { |
4dfb2df418f2
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|
4859 G1CollectedHeap* _g1h; |
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|
4860 OopClosure* _copy_non_heap_obj_cl; |
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|
4861 OopsInHeapRegionClosure* _copy_perm_obj_cl; |
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|
4862 G1ParScanThreadState* _par_scan_state; |
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|
4863 |
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|
4864 public: |
4dfb2df418f2
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|
4865 G1CopyingKeepAliveClosure(G1CollectedHeap* g1h, |
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|
4866 OopClosure* non_heap_obj_cl, |
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|
4867 OopsInHeapRegionClosure* perm_obj_cl, |
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|
4868 G1ParScanThreadState* pss): |
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|
4869 _g1h(g1h), |
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|
4870 _copy_non_heap_obj_cl(non_heap_obj_cl), |
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|
4871 _copy_perm_obj_cl(perm_obj_cl), |
4dfb2df418f2
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diff
changeset
|
4872 _par_scan_state(pss) |
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|
4873 {} |
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|
4874 |
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|
4875 virtual void do_oop(narrowOop* p) { do_oop_work(p); } |
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|
4876 virtual void do_oop( oop* p) { do_oop_work(p); } |
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|
4877 |
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|
4878 template <class T> void do_oop_work(T* p) { |
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|
4879 oop obj = oopDesc::load_decode_heap_oop(p); |
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|
4880 |
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|
4881 if (_g1h->obj_in_cs(obj)) { |
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|
4882 // If the referent object has been forwarded (either copied |
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|
4883 // to a new location or to itself in the event of an |
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|
4884 // evacuation failure) then we need to update the reference |
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|
4885 // field and, if both reference and referent are in the G1 |
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|
4886 // heap, update the RSet for the referent. |
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|
4887 // |
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|
4888 // If the referent has not been forwarded then we have to keep |
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|
4889 // it alive by policy. Therefore we have copy the referent. |
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|
4890 // |
4dfb2df418f2
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|
4891 // If the reference field is in the G1 heap then we can push |
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diff
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|
4892 // on the PSS queue. When the queue is drained (after each |
4dfb2df418f2
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parents:
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diff
changeset
|
4893 // phase of reference processing) the object and it's followers |
4dfb2df418f2
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parents:
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diff
changeset
|
4894 // will be copied, the reference field set to point to the |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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parents:
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diff
changeset
|
4895 // new location, and the RSet updated. Otherwise we need to |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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parents:
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changeset
|
4896 // use the the non-heap or perm closures directly to copy |
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parents:
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changeset
|
4897 // the refernt object and update the pointer, while avoiding |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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parents:
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diff
changeset
|
4898 // updating the RSet. |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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parents:
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diff
changeset
|
4899 |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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parents:
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diff
changeset
|
4900 if (_g1h->is_in_g1_reserved(p)) { |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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parents:
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diff
changeset
|
4901 _par_scan_state->push_on_queue(p); |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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parents:
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diff
changeset
|
4902 } else { |
4dfb2df418f2
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parents:
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diff
changeset
|
4903 // The reference field is not in the G1 heap. |
4dfb2df418f2
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parents:
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diff
changeset
|
4904 if (_g1h->perm_gen()->is_in(p)) { |
4dfb2df418f2
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parents:
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changeset
|
4905 _copy_perm_obj_cl->do_oop(p); |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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parents:
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diff
changeset
|
4906 } else { |
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parents:
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diff
changeset
|
4907 _copy_non_heap_obj_cl->do_oop(p); |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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parents:
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diff
changeset
|
4908 } |
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parents:
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diff
changeset
|
4909 } |
4dfb2df418f2
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parents:
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diff
changeset
|
4910 } |
4dfb2df418f2
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parents:
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diff
changeset
|
4911 } |
4dfb2df418f2
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parents:
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diff
changeset
|
4912 }; |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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parents:
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diff
changeset
|
4913 |
4dfb2df418f2
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diff
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|
4914 // Serial drain queue closure. Called as the 'complete_gc' |
4dfb2df418f2
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parents:
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diff
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|
4915 // closure for each discovered list in some of the |
4dfb2df418f2
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parents:
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diff
changeset
|
4916 // reference processing phases. |
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diff
changeset
|
4917 |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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|
4918 class G1STWDrainQueueClosure: public VoidClosure { |
4dfb2df418f2
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parents:
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diff
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|
4919 protected: |
4dfb2df418f2
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parents:
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diff
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|
4920 G1CollectedHeap* _g1h; |
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|
4921 G1ParScanThreadState* _par_scan_state; |
4dfb2df418f2
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|
4922 |
4dfb2df418f2
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diff
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|
4923 G1ParScanThreadState* par_scan_state() { return _par_scan_state; } |
4dfb2df418f2
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parents:
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changeset
|
4924 |
4dfb2df418f2
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parents:
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diff
changeset
|
4925 public: |
4dfb2df418f2
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parents:
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diff
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|
4926 G1STWDrainQueueClosure(G1CollectedHeap* g1h, G1ParScanThreadState* pss) : |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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parents:
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|
4927 _g1h(g1h), |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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parents:
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diff
changeset
|
4928 _par_scan_state(pss) |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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parents:
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diff
changeset
|
4929 { } |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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parents:
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diff
changeset
|
4930 |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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parents:
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diff
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|
4931 void do_void() { |
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parents:
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diff
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|
4932 G1ParScanThreadState* const pss = par_scan_state(); |
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parents:
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|
4933 pss->trim_queue(); |
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parents:
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diff
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|
4934 } |
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parents:
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diff
changeset
|
4935 }; |
4dfb2df418f2
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parents:
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diff
changeset
|
4936 |
4dfb2df418f2
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parents:
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|
4937 // Parallel Reference Processing closures |
4dfb2df418f2
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parents:
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diff
changeset
|
4938 |
4dfb2df418f2
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parents:
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diff
changeset
|
4939 // Implementation of AbstractRefProcTaskExecutor for parallel reference |
4dfb2df418f2
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parents:
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diff
changeset
|
4940 // processing during G1 evacuation pauses. |
4dfb2df418f2
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parents:
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diff
changeset
|
4941 |
4dfb2df418f2
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parents:
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|
4942 class G1STWRefProcTaskExecutor: public AbstractRefProcTaskExecutor { |
4dfb2df418f2
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parents:
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diff
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|
4943 private: |
4dfb2df418f2
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parents:
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diff
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|
4944 G1CollectedHeap* _g1h; |
4dfb2df418f2
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parents:
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diff
changeset
|
4945 RefToScanQueueSet* _queues; |
4095
bca17e38de00
6593758: RFE: Enhance GC ergonomics to dynamically choose ParallelGCThreads
jmasa
parents:
4090
diff
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|
4946 FlexibleWorkGang* _workers; |
3979
4dfb2df418f2
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parents:
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diff
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|
4947 int _active_workers; |
4dfb2df418f2
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parents:
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diff
changeset
|
4948 |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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parents:
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diff
changeset
|
4949 public: |
4dfb2df418f2
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parents:
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diff
changeset
|
4950 G1STWRefProcTaskExecutor(G1CollectedHeap* g1h, |
4095
bca17e38de00
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jmasa
parents:
4090
diff
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|
4951 FlexibleWorkGang* workers, |
3979
4dfb2df418f2
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parents:
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diff
changeset
|
4952 RefToScanQueueSet *task_queues, |
4dfb2df418f2
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parents:
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diff
changeset
|
4953 int n_workers) : |
4dfb2df418f2
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parents:
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diff
changeset
|
4954 _g1h(g1h), |
4dfb2df418f2
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parents:
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diff
changeset
|
4955 _queues(task_queues), |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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parents:
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diff
changeset
|
4956 _workers(workers), |
4dfb2df418f2
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parents:
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diff
changeset
|
4957 _active_workers(n_workers) |
4dfb2df418f2
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parents:
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diff
changeset
|
4958 { |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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parents:
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diff
changeset
|
4959 assert(n_workers > 0, "shouldn't call this otherwise"); |
4dfb2df418f2
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parents:
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diff
changeset
|
4960 } |
4dfb2df418f2
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parents:
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diff
changeset
|
4961 |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
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diff
changeset
|
4962 // Executes the given task using concurrent marking worker threads. |
4dfb2df418f2
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parents:
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diff
changeset
|
4963 virtual void execute(ProcessTask& task); |
4dfb2df418f2
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parents:
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diff
changeset
|
4964 virtual void execute(EnqueueTask& task); |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
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diff
changeset
|
4965 }; |
4dfb2df418f2
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parents:
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diff
changeset
|
4966 |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
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diff
changeset
|
4967 // Gang task for possibly parallel reference processing |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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parents:
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diff
changeset
|
4968 |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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parents:
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diff
changeset
|
4969 class G1STWRefProcTaskProxy: public AbstractGangTask { |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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parents:
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diff
changeset
|
4970 typedef AbstractRefProcTaskExecutor::ProcessTask ProcessTask; |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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parents:
3973
diff
changeset
|
4971 ProcessTask& _proc_task; |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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parents:
3973
diff
changeset
|
4972 G1CollectedHeap* _g1h; |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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parents:
3973
diff
changeset
|
4973 RefToScanQueueSet *_task_queues; |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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parents:
3973
diff
changeset
|
4974 ParallelTaskTerminator* _terminator; |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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parents:
3973
diff
changeset
|
4975 |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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parents:
3973
diff
changeset
|
4976 public: |
4dfb2df418f2
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johnc
parents:
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diff
changeset
|
4977 G1STWRefProcTaskProxy(ProcessTask& proc_task, |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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parents:
3973
diff
changeset
|
4978 G1CollectedHeap* g1h, |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
4979 RefToScanQueueSet *task_queues, |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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parents:
3973
diff
changeset
|
4980 ParallelTaskTerminator* terminator) : |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
4981 AbstractGangTask("Process reference objects in parallel"), |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
4982 _proc_task(proc_task), |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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parents:
3973
diff
changeset
|
4983 _g1h(g1h), |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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parents:
3973
diff
changeset
|
4984 _task_queues(task_queues), |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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parents:
3973
diff
changeset
|
4985 _terminator(terminator) |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
4986 {} |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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parents:
3973
diff
changeset
|
4987 |
4728
441e946dc1af
7121618: Change type of number of GC workers to unsigned int.
jmasa
parents:
4711
diff
changeset
|
4988 virtual void work(uint worker_id) { |
3979
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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parents:
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diff
changeset
|
4989 // The reference processing task executed by a single worker. |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
4990 ResourceMark rm; |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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parents:
3973
diff
changeset
|
4991 HandleMark hm; |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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parents:
3973
diff
changeset
|
4992 |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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parents:
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diff
changeset
|
4993 G1STWIsAliveClosure is_alive(_g1h); |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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parents:
3973
diff
changeset
|
4994 |
4728
441e946dc1af
7121618: Change type of number of GC workers to unsigned int.
jmasa
parents:
4711
diff
changeset
|
4995 G1ParScanThreadState pss(_g1h, worker_id); |
3979
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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parents:
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diff
changeset
|
4996 |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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parents:
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diff
changeset
|
4997 G1ParScanHeapEvacClosure scan_evac_cl(_g1h, &pss, NULL); |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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diff
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|
4998 G1ParScanHeapEvacFailureClosure evac_failure_cl(_g1h, &pss, NULL); |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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parents:
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diff
changeset
|
4999 G1ParScanPartialArrayClosure partial_scan_cl(_g1h, &pss, NULL); |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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parents:
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diff
changeset
|
5000 |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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parents:
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diff
changeset
|
5001 pss.set_evac_closure(&scan_evac_cl); |
4dfb2df418f2
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parents:
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diff
changeset
|
5002 pss.set_evac_failure_closure(&evac_failure_cl); |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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parents:
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diff
changeset
|
5003 pss.set_partial_scan_closure(&partial_scan_cl); |
4dfb2df418f2
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parents:
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diff
changeset
|
5004 |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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diff
changeset
|
5005 G1ParScanExtRootClosure only_copy_non_heap_cl(_g1h, &pss, NULL); |
4dfb2df418f2
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diff
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|
5006 G1ParScanPermClosure only_copy_perm_cl(_g1h, &pss, NULL); |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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parents:
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diff
changeset
|
5007 |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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diff
changeset
|
5008 G1ParScanAndMarkExtRootClosure copy_mark_non_heap_cl(_g1h, &pss, NULL); |
4dfb2df418f2
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parents:
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diff
changeset
|
5009 G1ParScanAndMarkPermClosure copy_mark_perm_cl(_g1h, &pss, NULL); |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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parents:
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diff
changeset
|
5010 |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5011 OopClosure* copy_non_heap_cl = &only_copy_non_heap_cl; |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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parents:
3973
diff
changeset
|
5012 OopsInHeapRegionClosure* copy_perm_cl = &only_copy_perm_cl; |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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parents:
3973
diff
changeset
|
5013 |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5014 if (_g1h->g1_policy()->during_initial_mark_pause()) { |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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parents:
3973
diff
changeset
|
5015 // We also need to mark copied objects. |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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parents:
3973
diff
changeset
|
5016 copy_non_heap_cl = ©_mark_non_heap_cl; |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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parents:
3973
diff
changeset
|
5017 copy_perm_cl = ©_mark_perm_cl; |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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parents:
3973
diff
changeset
|
5018 } |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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parents:
3973
diff
changeset
|
5019 |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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parents:
3973
diff
changeset
|
5020 // Keep alive closure. |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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parents:
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diff
changeset
|
5021 G1CopyingKeepAliveClosure keep_alive(_g1h, copy_non_heap_cl, copy_perm_cl, &pss); |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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parents:
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diff
changeset
|
5022 |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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parents:
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diff
changeset
|
5023 // Complete GC closure |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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parents:
3973
diff
changeset
|
5024 G1ParEvacuateFollowersClosure drain_queue(_g1h, &pss, _task_queues, _terminator); |
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5025 |
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5026 // Call the reference processing task's work routine. |
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5027 _proc_task.work(worker_id, is_alive, keep_alive, drain_queue); |
3979
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|
5028 |
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|
5029 // Note we cannot assert that the refs array is empty here as not all |
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|
5030 // of the processing tasks (specifically phase2 - pp2_work) execute |
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5031 // the complete_gc closure (which ordinarily would drain the queue) so |
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|
5032 // the queue may not be empty. |
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|
5033 } |
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|
5034 }; |
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|
5035 |
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|
5036 // Driver routine for parallel reference processing. |
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|
5037 // Creates an instance of the ref processing gang |
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|
5038 // task and has the worker threads execute it. |
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|
5039 void G1STWRefProcTaskExecutor::execute(ProcessTask& proc_task) { |
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|
5040 assert(_workers != NULL, "Need parallel worker threads."); |
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|
5041 |
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|
5042 ParallelTaskTerminator terminator(_active_workers, _queues); |
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5043 G1STWRefProcTaskProxy proc_task_proxy(proc_task, _g1h, _queues, &terminator); |
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|
5044 |
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|
5045 _g1h->set_par_threads(_active_workers); |
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5046 _workers->run_task(&proc_task_proxy); |
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5047 _g1h->set_par_threads(0); |
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|
5048 } |
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|
5049 |
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|
5050 // Gang task for parallel reference enqueueing. |
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|
5051 |
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5052 class G1STWRefEnqueueTaskProxy: public AbstractGangTask { |
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5053 typedef AbstractRefProcTaskExecutor::EnqueueTask EnqueueTask; |
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|
5054 EnqueueTask& _enq_task; |
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5055 |
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|
5056 public: |
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|
5057 G1STWRefEnqueueTaskProxy(EnqueueTask& enq_task) : |
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|
5058 AbstractGangTask("Enqueue reference objects in parallel"), |
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|
5059 _enq_task(enq_task) |
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|
5060 { } |
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|
5061 |
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5062 virtual void work(uint worker_id) { |
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5063 _enq_task.work(worker_id); |
3979
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|
5064 } |
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|
5065 }; |
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|
5066 |
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|
5067 // Driver routine for parallel reference enqueing. |
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|
5068 // Creates an instance of the ref enqueueing gang |
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|
5069 // task and has the worker threads execute it. |
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|
5070 |
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|
5071 void G1STWRefProcTaskExecutor::execute(EnqueueTask& enq_task) { |
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|
5072 assert(_workers != NULL, "Need parallel worker threads."); |
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|
5073 |
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|
5074 G1STWRefEnqueueTaskProxy enq_task_proxy(enq_task); |
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|
5075 |
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|
5076 _g1h->set_par_threads(_active_workers); |
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|
5077 _workers->run_task(&enq_task_proxy); |
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|
5078 _g1h->set_par_threads(0); |
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|
5079 } |
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changeset
|
5080 |
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|
5081 // End of weak reference support closures |
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|
5082 |
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|
5083 // Abstract task used to preserve (i.e. copy) any referent objects |
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|
5084 // that are in the collection set and are pointed to by reference |
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|
5085 // objects discovered by the CM ref processor. |
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diff
changeset
|
5086 |
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|
5087 class G1ParPreserveCMReferentsTask: public AbstractGangTask { |
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|
5088 protected: |
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diff
changeset
|
5089 G1CollectedHeap* _g1h; |
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diff
changeset
|
5090 RefToScanQueueSet *_queues; |
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|
5091 ParallelTaskTerminator _terminator; |
4728
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|
5092 uint _n_workers; |
3979
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diff
changeset
|
5093 |
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diff
changeset
|
5094 public: |
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diff
changeset
|
5095 G1ParPreserveCMReferentsTask(G1CollectedHeap* g1h,int workers, RefToScanQueueSet *task_queues) : |
4dfb2df418f2
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|
5096 AbstractGangTask("ParPreserveCMReferents"), |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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|
5097 _g1h(g1h), |
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parents:
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diff
changeset
|
5098 _queues(task_queues), |
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diff
changeset
|
5099 _terminator(workers, _queues), |
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diff
changeset
|
5100 _n_workers(workers) |
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diff
changeset
|
5101 { } |
4dfb2df418f2
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diff
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|
5102 |
4728
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|
5103 void work(uint worker_id) { |
3979
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|
5104 ResourceMark rm; |
4dfb2df418f2
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diff
changeset
|
5105 HandleMark hm; |
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diff
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|
5106 |
4728
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|
5107 G1ParScanThreadState pss(_g1h, worker_id); |
3979
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|
5108 G1ParScanHeapEvacClosure scan_evac_cl(_g1h, &pss, NULL); |
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|
5109 G1ParScanHeapEvacFailureClosure evac_failure_cl(_g1h, &pss, NULL); |
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|
5110 G1ParScanPartialArrayClosure partial_scan_cl(_g1h, &pss, NULL); |
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|
5111 |
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diff
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|
5112 pss.set_evac_closure(&scan_evac_cl); |
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changeset
|
5113 pss.set_evac_failure_closure(&evac_failure_cl); |
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|
5114 pss.set_partial_scan_closure(&partial_scan_cl); |
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|
5115 |
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diff
changeset
|
5116 assert(pss.refs()->is_empty(), "both queue and overflow should be empty"); |
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diff
changeset
|
5117 |
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diff
changeset
|
5118 |
4dfb2df418f2
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diff
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|
5119 G1ParScanExtRootClosure only_copy_non_heap_cl(_g1h, &pss, NULL); |
4dfb2df418f2
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|
5120 G1ParScanPermClosure only_copy_perm_cl(_g1h, &pss, NULL); |
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|
5121 |
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diff
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|
5122 G1ParScanAndMarkExtRootClosure copy_mark_non_heap_cl(_g1h, &pss, NULL); |
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|
5123 G1ParScanAndMarkPermClosure copy_mark_perm_cl(_g1h, &pss, NULL); |
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|
5124 |
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diff
changeset
|
5125 OopClosure* copy_non_heap_cl = &only_copy_non_heap_cl; |
4dfb2df418f2
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|
5126 OopsInHeapRegionClosure* copy_perm_cl = &only_copy_perm_cl; |
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|
5127 |
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diff
changeset
|
5128 if (_g1h->g1_policy()->during_initial_mark_pause()) { |
4dfb2df418f2
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diff
changeset
|
5129 // We also need to mark copied objects. |
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diff
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|
5130 copy_non_heap_cl = ©_mark_non_heap_cl; |
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|
5131 copy_perm_cl = ©_mark_perm_cl; |
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|
5132 } |
4dfb2df418f2
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diff
changeset
|
5133 |
4dfb2df418f2
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diff
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|
5134 // Is alive closure |
4dfb2df418f2
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diff
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|
5135 G1AlwaysAliveClosure always_alive(_g1h); |
4dfb2df418f2
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diff
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|
5136 |
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diff
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|
5137 // Copying keep alive closure. Applied to referent objects that need |
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diff
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|
5138 // to be copied. |
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diff
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|
5139 G1CopyingKeepAliveClosure keep_alive(_g1h, copy_non_heap_cl, copy_perm_cl, &pss); |
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|
5140 |
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diff
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|
5141 ReferenceProcessor* rp = _g1h->ref_processor_cm(); |
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|
5142 |
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|
5143 uint limit = ReferenceProcessor::number_of_subclasses_of_ref() * rp->max_num_q(); |
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|
5144 uint stride = MIN2(MAX2(_n_workers, 1U), limit); |
3979
4dfb2df418f2
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diff
changeset
|
5145 |
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diff
changeset
|
5146 // limit is set using max_num_q() - which was set using ParallelGCThreads. |
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|
5147 // So this must be true - but assert just in case someone decides to |
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diff
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|
5148 // change the worker ids. |
4728
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diff
changeset
|
5149 assert(0 <= worker_id && worker_id < limit, "sanity"); |
3979
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|
5150 assert(!rp->discovery_is_atomic(), "check this code"); |
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changeset
|
5151 |
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diff
changeset
|
5152 // Select discovered lists [i, i+stride, i+2*stride,...,limit) |
4728
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jmasa
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diff
changeset
|
5153 for (uint idx = worker_id; idx < limit; idx += stride) { |
4014
bf2d2b8b1726
7095243: Disambiguate ReferenceProcessor::_discoveredSoftRefs
johnc
parents:
4013
diff
changeset
|
5154 DiscoveredList& ref_list = rp->discovered_refs()[idx]; |
3979
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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parents:
3973
diff
changeset
|
5155 |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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parents:
3973
diff
changeset
|
5156 DiscoveredListIterator iter(ref_list, &keep_alive, &always_alive); |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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parents:
3973
diff
changeset
|
5157 while (iter.has_next()) { |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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parents:
3973
diff
changeset
|
5158 // Since discovery is not atomic for the CM ref processor, we |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5159 // can see some null referent objects. |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5160 iter.load_ptrs(DEBUG_ONLY(true)); |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5161 oop ref = iter.obj(); |
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 // This will filter nulls. |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5164 if (iter.is_referent_alive()) { |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5165 iter.make_referent_alive(); |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5166 } |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5167 iter.move_to_next(); |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5168 } |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5169 } |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5170 |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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parents:
3973
diff
changeset
|
5171 // Drain the queue - which may cause stealing |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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parents:
3973
diff
changeset
|
5172 G1ParEvacuateFollowersClosure drain_queue(_g1h, &pss, _queues, &_terminator); |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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parents:
3973
diff
changeset
|
5173 drain_queue.do_void(); |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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parents:
3973
diff
changeset
|
5174 // Allocation buffers were retired at the end of G1ParEvacuateFollowersClosure |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5175 assert(pss.refs()->is_empty(), "should be"); |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5176 } |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5177 }; |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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parents:
3973
diff
changeset
|
5178 |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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parents:
3973
diff
changeset
|
5179 // 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
|
5180 void G1CollectedHeap::process_discovered_references() { |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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parents:
3973
diff
changeset
|
5181 double ref_proc_start = os::elapsedTime(); |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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parents:
3973
diff
changeset
|
5182 |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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parents:
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diff
changeset
|
5183 ReferenceProcessor* rp = _ref_processor_stw; |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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parents:
3973
diff
changeset
|
5184 assert(rp->discovery_enabled(), "should have been enabled"); |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5185 |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5186 // Any reference objects, in the collection set, that were 'discovered' |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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parents:
3973
diff
changeset
|
5187 // by the CM ref processor should have already been copied (either by |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5188 // applying the external root copy closure to the discovered lists, or |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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parents:
3973
diff
changeset
|
5189 // by following an RSet entry). |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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parents:
3973
diff
changeset
|
5190 // |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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parents:
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diff
changeset
|
5191 // But some of the referents, that are in the collection set, that these |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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parents:
3973
diff
changeset
|
5192 // reference objects point to may not have been copied: the STW ref |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5193 // processor would have seen that the reference object had already |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5194 // been 'discovered' and would have skipped discovering the reference, |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5195 // but would not have treated the reference object as a regular oop. |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5196 // As a reult the copy closure would not have been applied to the |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5197 // referent object. |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5198 // |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5199 // We need to explicitly copy these referent objects - the references |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5200 // will be processed at the end of remarking. |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5201 // |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5202 // We also need to do this copying before we process the reference |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5203 // objects discovered by the STW ref processor in case one of these |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5204 // referents points to another object which is also referenced by an |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5205 // object discovered by the STW ref processor. |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5206 |
4728
441e946dc1af
7121618: Change type of number of GC workers to unsigned int.
jmasa
parents:
4711
diff
changeset
|
5207 uint active_workers = (G1CollectedHeap::use_parallel_gc_threads() ? |
4095
bca17e38de00
6593758: RFE: Enhance GC ergonomics to dynamically choose ParallelGCThreads
jmasa
parents:
4090
diff
changeset
|
5208 workers()->active_workers() : 1); |
bca17e38de00
6593758: RFE: Enhance GC ergonomics to dynamically choose ParallelGCThreads
jmasa
parents:
4090
diff
changeset
|
5209 |
4711 | 5210 assert(!G1CollectedHeap::use_parallel_gc_threads() || |
5211 active_workers == workers()->active_workers(), | |
5212 "Need to reset active_workers"); | |
5213 | |
4095
bca17e38de00
6593758: RFE: Enhance GC ergonomics to dynamically choose ParallelGCThreads
jmasa
parents:
4090
diff
changeset
|
5214 set_par_threads(active_workers); |
bca17e38de00
6593758: RFE: Enhance GC ergonomics to dynamically choose ParallelGCThreads
jmasa
parents:
4090
diff
changeset
|
5215 G1ParPreserveCMReferentsTask keep_cm_referents(this, active_workers, _task_queues); |
3979
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5216 |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5217 if (G1CollectedHeap::use_parallel_gc_threads()) { |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5218 workers()->run_task(&keep_cm_referents); |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5219 } else { |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5220 keep_cm_referents.work(0); |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5221 } |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5222 |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5223 set_par_threads(0); |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5224 |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5225 // Closure to test whether a referent is alive. |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5226 G1STWIsAliveClosure is_alive(this); |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5227 |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5228 // Even when parallel reference processing is enabled, the processing |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5229 // of JNI refs is serial and performed serially by the current thread |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5230 // rather than by a worker. The following PSS will be used for processing |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5231 // JNI refs. |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5232 |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5233 // Use only a single queue for this PSS. |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5234 G1ParScanThreadState pss(this, 0); |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5235 |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5236 // We do not embed a reference processor in the copying/scanning |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5237 // closures while we're actually processing the discovered |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5238 // reference objects. |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5239 G1ParScanHeapEvacClosure scan_evac_cl(this, &pss, NULL); |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5240 G1ParScanHeapEvacFailureClosure evac_failure_cl(this, &pss, NULL); |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5241 G1ParScanPartialArrayClosure partial_scan_cl(this, &pss, NULL); |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5242 |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5243 pss.set_evac_closure(&scan_evac_cl); |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5244 pss.set_evac_failure_closure(&evac_failure_cl); |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5245 pss.set_partial_scan_closure(&partial_scan_cl); |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5246 |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5247 assert(pss.refs()->is_empty(), "pre-condition"); |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5248 |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5249 G1ParScanExtRootClosure only_copy_non_heap_cl(this, &pss, NULL); |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5250 G1ParScanPermClosure only_copy_perm_cl(this, &pss, NULL); |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5251 |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5252 G1ParScanAndMarkExtRootClosure copy_mark_non_heap_cl(this, &pss, NULL); |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5253 G1ParScanAndMarkPermClosure copy_mark_perm_cl(this, &pss, NULL); |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5254 |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5255 OopClosure* copy_non_heap_cl = &only_copy_non_heap_cl; |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5256 OopsInHeapRegionClosure* copy_perm_cl = &only_copy_perm_cl; |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5257 |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5258 if (_g1h->g1_policy()->during_initial_mark_pause()) { |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5259 // We also need to mark copied objects. |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5260 copy_non_heap_cl = ©_mark_non_heap_cl; |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5261 copy_perm_cl = ©_mark_perm_cl; |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5262 } |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5263 |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5264 // Keep alive closure. |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5265 G1CopyingKeepAliveClosure keep_alive(this, copy_non_heap_cl, copy_perm_cl, &pss); |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5266 |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5267 // Serial Complete GC closure |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5268 G1STWDrainQueueClosure drain_queue(this, &pss); |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5269 |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5270 // Setup the soft refs policy... |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5271 rp->setup_policy(false); |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5272 |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5273 if (!rp->processing_is_mt()) { |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5274 // Serial reference processing... |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5275 rp->process_discovered_references(&is_alive, |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5276 &keep_alive, |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5277 &drain_queue, |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5278 NULL); |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5279 } else { |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5280 // Parallel reference processing |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5281 assert(rp->num_q() == active_workers, "sanity"); |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5282 assert(active_workers <= rp->max_num_q(), "sanity"); |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5283 |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5284 G1STWRefProcTaskExecutor par_task_executor(this, workers(), _task_queues, active_workers); |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5285 rp->process_discovered_references(&is_alive, &keep_alive, &drain_queue, &par_task_executor); |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5286 } |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5287 |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5288 // We have completed copying any necessary live referent objects |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5289 // (that were not copied during the actual pause) so we can |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5290 // retire any active alloc buffers |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5291 pss.retire_alloc_buffers(); |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5292 assert(pss.refs()->is_empty(), "both queue and overflow should be empty"); |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5293 |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5294 double ref_proc_time = os::elapsedTime() - ref_proc_start; |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5295 g1_policy()->record_ref_proc_time(ref_proc_time * 1000.0); |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5296 } |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5297 |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5298 // Weak Reference processing during an evacuation pause (part 2). |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5299 void G1CollectedHeap::enqueue_discovered_references() { |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5300 double ref_enq_start = os::elapsedTime(); |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5301 |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5302 ReferenceProcessor* rp = _ref_processor_stw; |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5303 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
|
5304 |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5305 // Now enqueue any remaining on the discovered lists on to |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5306 // the pending list. |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5307 if (!rp->processing_is_mt()) { |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5308 // Serial reference processing... |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5309 rp->enqueue_discovered_references(); |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5310 } else { |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5311 // Parallel reference enqueuing |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5312 |
4728
441e946dc1af
7121618: Change type of number of GC workers to unsigned int.
jmasa
parents:
4711
diff
changeset
|
5313 uint active_workers = (ParallelGCThreads > 0 ? workers()->active_workers() : 1); |
4095
bca17e38de00
6593758: RFE: Enhance GC ergonomics to dynamically choose ParallelGCThreads
jmasa
parents:
4090
diff
changeset
|
5314 assert(active_workers == workers()->active_workers(), |
bca17e38de00
6593758: RFE: Enhance GC ergonomics to dynamically choose ParallelGCThreads
jmasa
parents:
4090
diff
changeset
|
5315 "Need to reset active_workers"); |
3979
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5316 assert(rp->num_q() == active_workers, "sanity"); |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5317 assert(active_workers <= rp->max_num_q(), "sanity"); |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5318 |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5319 G1STWRefProcTaskExecutor par_task_executor(this, workers(), _task_queues, active_workers); |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5320 rp->enqueue_discovered_references(&par_task_executor); |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5321 } |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5322 |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5323 rp->verify_no_references_recorded(); |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5324 assert(!rp->discovery_enabled(), "should have been disabled"); |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5325 |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5326 // FIXME |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5327 // CM's reference processing also cleans up the string and symbol tables. |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5328 // Should we do that here also? We could, but it is a serial operation |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5329 // and could signicantly increase the pause time. |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5330 |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5331 double ref_enq_time = os::elapsedTime() - ref_enq_start; |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5332 g1_policy()->record_ref_enq_time(ref_enq_time * 1000.0); |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
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|
5333 } |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5334 |
342 | 5335 void G1CollectedHeap::evacuate_collection_set() { |
4781
bacb651cf5bf
7113006: G1: excessive ergo output when an evac failure happens
tonyp
parents:
4728
diff
changeset
|
5336 _expand_heap_after_alloc_failure = true; |
342 | 5337 set_evacuation_failed(false); |
5338 | |
5339 g1_rem_set()->prepare_for_oops_into_collection_set_do(); | |
5340 concurrent_g1_refine()->set_use_cache(false); | |
889 | 5341 concurrent_g1_refine()->clear_hot_cache_claimed_index(); |
5342 | |
4728
441e946dc1af
7121618: Change type of number of GC workers to unsigned int.
jmasa
parents:
4711
diff
changeset
|
5343 uint n_workers; |
4095
bca17e38de00
6593758: RFE: Enhance GC ergonomics to dynamically choose ParallelGCThreads
jmasa
parents:
4090
diff
changeset
|
5344 if (G1CollectedHeap::use_parallel_gc_threads()) { |
bca17e38de00
6593758: RFE: Enhance GC ergonomics to dynamically choose ParallelGCThreads
jmasa
parents:
4090
diff
changeset
|
5345 n_workers = |
bca17e38de00
6593758: RFE: Enhance GC ergonomics to dynamically choose ParallelGCThreads
jmasa
parents:
4090
diff
changeset
|
5346 AdaptiveSizePolicy::calc_active_workers(workers()->total_workers(), |
bca17e38de00
6593758: RFE: Enhance GC ergonomics to dynamically choose ParallelGCThreads
jmasa
parents:
4090
diff
changeset
|
5347 workers()->active_workers(), |
bca17e38de00
6593758: RFE: Enhance GC ergonomics to dynamically choose ParallelGCThreads
jmasa
parents:
4090
diff
changeset
|
5348 Threads::number_of_non_daemon_threads()); |
bca17e38de00
6593758: RFE: Enhance GC ergonomics to dynamically choose ParallelGCThreads
jmasa
parents:
4090
diff
changeset
|
5349 assert(UseDynamicNumberOfGCThreads || |
bca17e38de00
6593758: RFE: Enhance GC ergonomics to dynamically choose ParallelGCThreads
jmasa
parents:
4090
diff
changeset
|
5350 n_workers == workers()->total_workers(), |
bca17e38de00
6593758: RFE: Enhance GC ergonomics to dynamically choose ParallelGCThreads
jmasa
parents:
4090
diff
changeset
|
5351 "If not dynamic should be using all the workers"); |
4711 | 5352 workers()->set_active_workers(n_workers); |
4095
bca17e38de00
6593758: RFE: Enhance GC ergonomics to dynamically choose ParallelGCThreads
jmasa
parents:
4090
diff
changeset
|
5353 set_par_threads(n_workers); |
bca17e38de00
6593758: RFE: Enhance GC ergonomics to dynamically choose ParallelGCThreads
jmasa
parents:
4090
diff
changeset
|
5354 } else { |
bca17e38de00
6593758: RFE: Enhance GC ergonomics to dynamically choose ParallelGCThreads
jmasa
parents:
4090
diff
changeset
|
5355 assert(n_par_threads() == 0, |
bca17e38de00
6593758: RFE: Enhance GC ergonomics to dynamically choose ParallelGCThreads
jmasa
parents:
4090
diff
changeset
|
5356 "Should be the original non-parallel value"); |
bca17e38de00
6593758: RFE: Enhance GC ergonomics to dynamically choose ParallelGCThreads
jmasa
parents:
4090
diff
changeset
|
5357 n_workers = 1; |
bca17e38de00
6593758: RFE: Enhance GC ergonomics to dynamically choose ParallelGCThreads
jmasa
parents:
4090
diff
changeset
|
5358 } |
bca17e38de00
6593758: RFE: Enhance GC ergonomics to dynamically choose ParallelGCThreads
jmasa
parents:
4090
diff
changeset
|
5359 |
bca17e38de00
6593758: RFE: Enhance GC ergonomics to dynamically choose ParallelGCThreads
jmasa
parents:
4090
diff
changeset
|
5360 G1ParTask g1_par_task(this, _task_queues); |
342 | 5361 |
5362 init_for_evac_failure(NULL); | |
5363 | |
5364 rem_set()->prepare_for_younger_refs_iterate(true); | |
616
4f360ec815ba
6720309: G1: don't synchronously update RSet during evacuation pauses
iveresov
parents:
595
diff
changeset
|
5365 |
4f360ec815ba
6720309: G1: don't synchronously update RSet during evacuation pauses
iveresov
parents:
595
diff
changeset
|
5366 assert(dirty_card_queue_set().completed_buffers_num() == 0, "Should be empty"); |
342 | 5367 double start_par = os::elapsedTime(); |
3979
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5368 |
1833
8b10f48633dc
6984287: Regularize how GC parallel workers are specified.
jmasa
parents:
1755
diff
changeset
|
5369 if (G1CollectedHeap::use_parallel_gc_threads()) { |
342 | 5370 // The individual threads will set their evac-failure closures. |
989
148e5441d916
6863023: need non-perm oops in code cache for JSR 292
jrose
parents:
890
diff
changeset
|
5371 StrongRootsScope srs(this); |
1709 | 5372 if (ParallelGCVerbose) G1ParScanThreadState::print_termination_stats_hdr(); |
4095
bca17e38de00
6593758: RFE: Enhance GC ergonomics to dynamically choose ParallelGCThreads
jmasa
parents:
4090
diff
changeset
|
5373 // These tasks use ShareHeap::_process_strong_tasks |
bca17e38de00
6593758: RFE: Enhance GC ergonomics to dynamically choose ParallelGCThreads
jmasa
parents:
4090
diff
changeset
|
5374 assert(UseDynamicNumberOfGCThreads || |
bca17e38de00
6593758: RFE: Enhance GC ergonomics to dynamically choose ParallelGCThreads
jmasa
parents:
4090
diff
changeset
|
5375 workers()->active_workers() == workers()->total_workers(), |
bca17e38de00
6593758: RFE: Enhance GC ergonomics to dynamically choose ParallelGCThreads
jmasa
parents:
4090
diff
changeset
|
5376 "If not dynamic should be using all the workers"); |
342 | 5377 workers()->run_task(&g1_par_task); |
5378 } else { | |
989
148e5441d916
6863023: need non-perm oops in code cache for JSR 292
jrose
parents:
890
diff
changeset
|
5379 StrongRootsScope srs(this); |
4711 | 5380 g1_par_task.set_for_termination(n_workers); |
342 | 5381 g1_par_task.work(0); |
5382 } | |
5383 | |
5384 double par_time = (os::elapsedTime() - start_par) * 1000.0; | |
5385 g1_policy()->record_par_time(par_time); | |
4095
bca17e38de00
6593758: RFE: Enhance GC ergonomics to dynamically choose ParallelGCThreads
jmasa
parents:
4090
diff
changeset
|
5386 |
342 | 5387 set_par_threads(0); |
1974
fd1d227ef1b9
6983204: G1: Nightly test nsk/regression/b4958615 failing with +ExplicitGCInvokesConcurrent
johnc
parents:
1973
diff
changeset
|
5388 |
3979
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5389 // Process any discovered reference objects - we have |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5390 // to do this _before_ we retire the GC alloc regions |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5391 // as we may have to copy some 'reachable' referent |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5392 // objects (and their reachable sub-graphs) that were |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5393 // not copied during the pause. |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5394 process_discovered_references(); |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5395 |
1974
fd1d227ef1b9
6983204: G1: Nightly test nsk/regression/b4958615 failing with +ExplicitGCInvokesConcurrent
johnc
parents:
1973
diff
changeset
|
5396 // Weak root processing. |
fd1d227ef1b9
6983204: G1: Nightly test nsk/regression/b4958615 failing with +ExplicitGCInvokesConcurrent
johnc
parents:
1973
diff
changeset
|
5397 // Note: when JSR 292 is enabled and code blobs can contain |
fd1d227ef1b9
6983204: G1: Nightly test nsk/regression/b4958615 failing with +ExplicitGCInvokesConcurrent
johnc
parents:
1973
diff
changeset
|
5398 // non-perm oops then we will need to process the code blobs |
fd1d227ef1b9
6983204: G1: Nightly test nsk/regression/b4958615 failing with +ExplicitGCInvokesConcurrent
johnc
parents:
1973
diff
changeset
|
5399 // here too. |
342 | 5400 { |
3979
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5401 G1STWIsAliveClosure is_alive(this); |
342 | 5402 G1KeepAliveClosure keep_alive(this); |
5403 JNIHandles::weak_oops_do(&is_alive, &keep_alive); | |
5404 } | |
3979
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5405 |
3830
f44782f04dd4
7039627: G1: avoid BOT updates for survivor allocations and dirty survivor regions incrementally
tonyp
parents:
3824
diff
changeset
|
5406 release_gc_alloc_regions(); |
342 | 5407 g1_rem_set()->cleanup_after_oops_into_collection_set_do(); |
616
4f360ec815ba
6720309: G1: don't synchronously update RSet during evacuation pauses
iveresov
parents:
595
diff
changeset
|
5408 |
889 | 5409 concurrent_g1_refine()->clear_hot_cache(); |
342 | 5410 concurrent_g1_refine()->set_use_cache(true); |
5411 | |
5412 finalize_for_evac_failure(); | |
5413 | |
4097
dc467e8b2c5e
7112743: G1: Reduce overhead of marking closure during evacuation pauses
johnc
parents:
4095
diff
changeset
|
5414 // Must do this before clearing the per-region evac-failure flags |
dc467e8b2c5e
7112743: G1: Reduce overhead of marking closure during evacuation pauses
johnc
parents:
4095
diff
changeset
|
5415 // (which is currently done when we free the collection set). |
dc467e8b2c5e
7112743: G1: Reduce overhead of marking closure during evacuation pauses
johnc
parents:
4095
diff
changeset
|
5416 // We also only do this if marking is actually in progress and so |
dc467e8b2c5e
7112743: G1: Reduce overhead of marking closure during evacuation pauses
johnc
parents:
4095
diff
changeset
|
5417 // have to do this before we set the mark_in_progress flag at the |
dc467e8b2c5e
7112743: G1: Reduce overhead of marking closure during evacuation pauses
johnc
parents:
4095
diff
changeset
|
5418 // end of an initial mark pause. |
342 | 5419 concurrent_mark()->complete_marking_in_collection_set(); |
5420 | |
5421 if (evacuation_failed()) { | |
5422 remove_self_forwarding_pointers(); | |
5423 if (PrintGCDetails) { | |
1719
b63010841f78
6975964: G1: print out a more descriptive message for evacuation failure when +PrintGCDetails is set
tonyp
parents:
1718
diff
changeset
|
5424 gclog_or_tty->print(" (to-space overflow)"); |
342 | 5425 } else if (PrintGC) { |
5426 gclog_or_tty->print("--"); | |
5427 } | |
5428 } | |
5429 | |
3979
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5430 // Enqueue any remaining references remaining on the STW |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5431 // reference processor's discovered lists. We need to do |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5432 // this after the card table is cleaned (and verified) as |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5433 // the act of enqueuing entries on to the pending list |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5434 // will log these updates (and dirty their associated |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5435 // cards). We need these updates logged to update any |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5436 // RSets. |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5437 enqueue_discovered_references(); |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5438 |
616
4f360ec815ba
6720309: G1: don't synchronously update RSet during evacuation pauses
iveresov
parents:
595
diff
changeset
|
5439 if (G1DeferredRSUpdate) { |
4f360ec815ba
6720309: G1: don't synchronously update RSet during evacuation pauses
iveresov
parents:
595
diff
changeset
|
5440 RedirtyLoggedCardTableEntryFastClosure redirty; |
4f360ec815ba
6720309: G1: don't synchronously update RSet during evacuation pauses
iveresov
parents:
595
diff
changeset
|
5441 dirty_card_queue_set().set_closure(&redirty); |
4f360ec815ba
6720309: G1: don't synchronously update RSet during evacuation pauses
iveresov
parents:
595
diff
changeset
|
5442 dirty_card_queue_set().apply_closure_to_all_completed_buffers(); |
1111 | 5443 |
5444 DirtyCardQueueSet& dcq = JavaThread::dirty_card_queue_set(); | |
5445 dcq.merge_bufferlists(&dirty_card_queue_set()); | |
616
4f360ec815ba
6720309: G1: don't synchronously update RSet during evacuation pauses
iveresov
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5446 assert(dirty_card_queue_set().completed_buffers_num() == 0, "All should be consumed"); |
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5447 } |
342 | 5448 COMPILER2_PRESENT(DerivedPointerTable::update_pointers()); |
5449 } | |
5450 | |
2173 | 5451 void G1CollectedHeap::free_region_if_empty(HeapRegion* hr, |
2152 | 5452 size_t* pre_used, |
5453 FreeRegionList* free_list, | |
4072 | 5454 OldRegionSet* old_proxy_set, |
2152 | 5455 HumongousRegionSet* humongous_proxy_set, |
2173 | 5456 HRRSCleanupTask* hrrs_cleanup_task, |
2152 | 5457 bool par) { |
5458 if (hr->used() > 0 && hr->max_live_bytes() == 0 && !hr->is_young()) { | |
5459 if (hr->isHumongous()) { | |
5460 assert(hr->startsHumongous(), "we should only see starts humongous"); | |
5461 free_humongous_region(hr, pre_used, free_list, humongous_proxy_set, par); | |
5462 } else { | |
4072 | 5463 _old_set.remove_with_proxy(hr, old_proxy_set); |
2152 | 5464 free_region(hr, pre_used, free_list, par); |
342 | 5465 } |
2173 | 5466 } else { |
5467 hr->rem_set()->do_cleanup_work(hrrs_cleanup_task); | |
342 | 5468 } |
5469 } | |
5470 | |
2152 | 5471 void G1CollectedHeap::free_region(HeapRegion* hr, |
5472 size_t* pre_used, | |
5473 FreeRegionList* free_list, | |
5474 bool par) { | |
5475 assert(!hr->isHumongous(), "this is only for non-humongous regions"); | |
5476 assert(!hr->is_empty(), "the region should not be empty"); | |
5477 assert(free_list != NULL, "pre-condition"); | |
5478 | |
5479 *pre_used += hr->used(); | |
5480 hr->hr_clear(par, true /* clear_space */); | |
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5481 free_list->add_as_head(hr); |
2152 | 5482 } |
5483 | |
5484 void G1CollectedHeap::free_humongous_region(HeapRegion* hr, | |
5485 size_t* pre_used, | |
5486 FreeRegionList* free_list, | |
5487 HumongousRegionSet* humongous_proxy_set, | |
5488 bool par) { | |
5489 assert(hr->startsHumongous(), "this is only for starts humongous regions"); | |
5490 assert(free_list != NULL, "pre-condition"); | |
5491 assert(humongous_proxy_set != NULL, "pre-condition"); | |
5492 | |
5493 size_t hr_used = hr->used(); | |
5494 size_t hr_capacity = hr->capacity(); | |
5495 size_t hr_pre_used = 0; | |
5496 _humongous_set.remove_with_proxy(hr, humongous_proxy_set); | |
5497 hr->set_notHumongous(); | |
5498 free_region(hr, &hr_pre_used, free_list, par); | |
5499 | |
3766 | 5500 size_t i = hr->hrs_index() + 1; |
2152 | 5501 size_t num = 1; |
3766 | 5502 while (i < n_regions()) { |
5503 HeapRegion* curr_hr = region_at(i); | |
2152 | 5504 if (!curr_hr->continuesHumongous()) { |
5505 break; | |
5506 } | |
5507 curr_hr->set_notHumongous(); | |
5508 free_region(curr_hr, &hr_pre_used, free_list, par); | |
5509 num += 1; | |
5510 i += 1; | |
5511 } | |
5512 assert(hr_pre_used == hr_used, | |
5513 err_msg("hr_pre_used: "SIZE_FORMAT" and hr_used: "SIZE_FORMAT" " | |
5514 "should be the same", hr_pre_used, hr_used)); | |
5515 *pre_used += hr_pre_used; | |
5516 } | |
5517 | |
5518 void G1CollectedHeap::update_sets_after_freeing_regions(size_t pre_used, | |
5519 FreeRegionList* free_list, | |
4072 | 5520 OldRegionSet* old_proxy_set, |
2152 | 5521 HumongousRegionSet* humongous_proxy_set, |
5522 bool par) { | |
5523 if (pre_used > 0) { | |
5524 Mutex* lock = (par) ? ParGCRareEvent_lock : NULL; | |
342 | 5525 MutexLockerEx x(lock, Mutex::_no_safepoint_check_flag); |
2152 | 5526 assert(_summary_bytes_used >= pre_used, |
5527 err_msg("invariant: _summary_bytes_used: "SIZE_FORMAT" " | |
5528 "should be >= pre_used: "SIZE_FORMAT, | |
5529 _summary_bytes_used, pre_used)); | |
342 | 5530 _summary_bytes_used -= pre_used; |
2152 | 5531 } |
5532 if (free_list != NULL && !free_list->is_empty()) { | |
5533 MutexLockerEx x(FreeList_lock, Mutex::_no_safepoint_check_flag); | |
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5534 _free_list.add_as_head(free_list); |
2152 | 5535 } |
4072 | 5536 if (old_proxy_set != NULL && !old_proxy_set->is_empty()) { |
5537 MutexLockerEx x(OldSets_lock, Mutex::_no_safepoint_check_flag); | |
5538 _old_set.update_from_proxy(old_proxy_set); | |
5539 } | |
2152 | 5540 if (humongous_proxy_set != NULL && !humongous_proxy_set->is_empty()) { |
5541 MutexLockerEx x(OldSets_lock, Mutex::_no_safepoint_check_flag); | |
5542 _humongous_set.update_from_proxy(humongous_proxy_set); | |
342 | 5543 } |
5544 } | |
5545 | |
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5546 class G1ParCleanupCTTask : public AbstractGangTask { |
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5547 CardTableModRefBS* _ct_bs; |
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5548 G1CollectedHeap* _g1h; |
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5549 HeapRegion* volatile _su_head; |
796
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5550 public: |
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5551 G1ParCleanupCTTask(CardTableModRefBS* ct_bs, |
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5552 G1CollectedHeap* g1h) : |
796
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5553 AbstractGangTask("G1 Par Cleanup CT Task"), |
3830
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5554 _ct_bs(ct_bs), _g1h(g1h) { } |
796
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5555 |
4728
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7121618: Change type of number of GC workers to unsigned int.
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|
5556 void work(uint worker_id) { |
796
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5557 HeapRegion* r; |
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5558 while (r = _g1h->pop_dirty_cards_region()) { |
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5559 clear_cards(r); |
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|
5560 } |
940
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|
5561 } |
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5562 |
796
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|
5563 void clear_cards(HeapRegion* r) { |
3830
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5564 // Cards of the survivors should have already been dirtied. |
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5565 if (!r->is_survivor()) { |
796
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5566 _ct_bs->clear(MemRegion(r->bottom(), r->end())); |
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|
5567 } |
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|
5568 } |
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|
5569 }; |
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|
5570 |
940
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|
5571 #ifndef PRODUCT |
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5572 class G1VerifyCardTableCleanup: public HeapRegionClosure { |
3317
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5573 G1CollectedHeap* _g1h; |
940
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5574 CardTableModRefBS* _ct_bs; |
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5575 public: |
3317
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5576 G1VerifyCardTableCleanup(G1CollectedHeap* g1h, CardTableModRefBS* ct_bs) |
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5577 : _g1h(g1h), _ct_bs(ct_bs) { } |
2433
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|
5578 virtual bool doHeapRegion(HeapRegion* r) { |
1394
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|
5579 if (r->is_survivor()) { |
3317
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|
5580 _g1h->verify_dirty_region(r); |
940
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5581 } else { |
3317
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|
5582 _g1h->verify_not_dirty_region(r); |
940
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|
5583 } |
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diff
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|
5584 return false; |
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6841313: G1: dirty cards of survivor regions in parallel
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|
5585 } |
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|
5586 }; |
2433
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|
5587 |
3317
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|
5588 void G1CollectedHeap::verify_not_dirty_region(HeapRegion* hr) { |
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5589 // All of the region should be clean. |
063382f9b575
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|
5590 CardTableModRefBS* ct_bs = (CardTableModRefBS*)barrier_set(); |
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|
5591 MemRegion mr(hr->bottom(), hr->end()); |
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|
5592 ct_bs->verify_not_dirty_region(mr); |
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|
5593 } |
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|
5594 |
063382f9b575
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|
5595 void G1CollectedHeap::verify_dirty_region(HeapRegion* hr) { |
063382f9b575
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|
5596 // We cannot guarantee that [bottom(),end()] is dirty. Threads |
063382f9b575
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|
5597 // dirty allocated blocks as they allocate them. The thread that |
063382f9b575
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|
5598 // retires each region and replaces it with a new one will do a |
063382f9b575
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|
5599 // maximal allocation to fill in [pre_dummy_top(),end()] but will |
063382f9b575
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5600 // not dirty that area (one less thing to have to do while holding |
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|
5601 // a lock). So we can only verify that [bottom(),pre_dummy_top()] |
063382f9b575
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|
5602 // is dirty. |
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|
5603 CardTableModRefBS* ct_bs = (CardTableModRefBS*) barrier_set(); |
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|
5604 MemRegion mr(hr->bottom(), hr->pre_dummy_top()); |
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|
5605 ct_bs->verify_dirty_region(mr); |
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|
5606 } |
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|
5607 |
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|
5608 void G1CollectedHeap::verify_dirty_young_list(HeapRegion* head) { |
3317
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5609 CardTableModRefBS* ct_bs = (CardTableModRefBS*) barrier_set(); |
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|
5610 for (HeapRegion* hr = head; hr != NULL; hr = hr->get_next_young_region()) { |
3317
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|
5611 verify_dirty_region(hr); |
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|
5612 } |
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|
5613 } |
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|
5614 |
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|
5615 void G1CollectedHeap::verify_dirty_young_regions() { |
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5616 verify_dirty_young_list(_young_list->first_region()); |
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5617 verify_dirty_young_list(_young_list->first_survivor_region()); |
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|
5618 } |
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|
5619 #endif |
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5620 |
342 | 5621 void G1CollectedHeap::cleanUpCardTable() { |
5622 CardTableModRefBS* ct_bs = (CardTableModRefBS*) (barrier_set()); | |
5623 double start = os::elapsedTime(); | |
5624 | |
4023 | 5625 { |
5626 // Iterate over the dirty cards region list. | |
5627 G1ParCleanupCTTask cleanup_task(ct_bs, this); | |
5628 | |
4711 | 5629 if (G1CollectedHeap::use_parallel_gc_threads()) { |
5630 set_par_threads(); | |
4023 | 5631 workers()->run_task(&cleanup_task); |
5632 set_par_threads(0); | |
5633 } else { | |
5634 while (_dirty_cards_region_list) { | |
5635 HeapRegion* r = _dirty_cards_region_list; | |
5636 cleanup_task.clear_cards(r); | |
5637 _dirty_cards_region_list = r->get_next_dirty_cards_region(); | |
5638 if (_dirty_cards_region_list == r) { | |
5639 // The last region. | |
5640 _dirty_cards_region_list = NULL; | |
5641 } | |
5642 r->set_next_dirty_cards_region(NULL); | |
796
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|
5643 } |
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|
5644 } |
4023 | 5645 #ifndef PRODUCT |
5646 if (G1VerifyCTCleanup || VerifyAfterGC) { | |
5647 G1VerifyCardTableCleanup cleanup_verifier(this, ct_bs); | |
5648 heap_region_iterate(&cleanup_verifier); | |
5649 } | |
5650 #endif | |
940
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|
5651 } |
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5652 |
342 | 5653 double elapsed = os::elapsedTime() - start; |
3979
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diff
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|
5654 g1_policy()->record_clear_ct_time(elapsed * 1000.0); |
342 | 5655 } |
5656 | |
5657 void G1CollectedHeap::free_collection_set(HeapRegion* cs_head) { | |
2152 | 5658 size_t pre_used = 0; |
5659 FreeRegionList local_free_list("Local List for CSet Freeing"); | |
5660 | |
342 | 5661 double young_time_ms = 0.0; |
5662 double non_young_time_ms = 0.0; | |
5663 | |
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5664 // Since the collection set is a superset of the the young list, |
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5665 // all we need to do to clear the young list is clear its |
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5666 // head and length, and unlink any young regions in the code below |
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5667 _young_list->clear(); |
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5668 |
342 | 5669 G1CollectorPolicy* policy = g1_policy(); |
5670 | |
5671 double start_sec = os::elapsedTime(); | |
5672 bool non_young = true; | |
5673 | |
5674 HeapRegion* cur = cs_head; | |
5675 int age_bound = -1; | |
5676 size_t rs_lengths = 0; | |
5677 | |
5678 while (cur != NULL) { | |
2361 | 5679 assert(!is_on_master_free_list(cur), "sanity"); |
342 | 5680 if (non_young) { |
5681 if (cur->is_young()) { | |
5682 double end_sec = os::elapsedTime(); | |
5683 double elapsed_ms = (end_sec - start_sec) * 1000.0; | |
5684 non_young_time_ms += elapsed_ms; | |
5685 | |
5686 start_sec = os::elapsedTime(); | |
5687 non_young = false; | |
5688 } | |
5689 } else { | |
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5690 if (!cur->is_young()) { |
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5691 double end_sec = os::elapsedTime(); |
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5692 double elapsed_ms = (end_sec - start_sec) * 1000.0; |
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5693 young_time_ms += elapsed_ms; |
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5694 |
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5695 start_sec = os::elapsedTime(); |
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5696 non_young = true; |
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5697 } |
342 | 5698 } |
5699 | |
5700 rs_lengths += cur->rem_set()->occupied(); | |
5701 | |
5702 HeapRegion* next = cur->next_in_collection_set(); | |
5703 assert(cur->in_collection_set(), "bad CS"); | |
5704 cur->set_next_in_collection_set(NULL); | |
5705 cur->set_in_collection_set(false); | |
5706 | |
5707 if (cur->is_young()) { | |
5708 int index = cur->young_index_in_cset(); | |
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5709 assert(index != -1, "invariant"); |
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5710 assert((size_t) index < policy->young_cset_region_length(), "invariant"); |
342 | 5711 size_t words_survived = _surviving_young_words[index]; |
5712 cur->record_surv_words_in_group(words_survived); | |
1394
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5713 |
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5714 // At this point the we have 'popped' cur from the collection set |
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5715 // (linked via next_in_collection_set()) but it is still in the |
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5716 // young list (linked via next_young_region()). Clear the |
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5717 // _next_young_region field. |
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5718 cur->set_next_young_region(NULL); |
342 | 5719 } else { |
5720 int index = cur->young_index_in_cset(); | |
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5721 assert(index == -1, "invariant"); |
342 | 5722 } |
5723 | |
5724 assert( (cur->is_young() && cur->young_index_in_cset() > -1) || | |
5725 (!cur->is_young() && cur->young_index_in_cset() == -1), | |
5726 "invariant" ); | |
5727 | |
5728 if (!cur->evacuation_failed()) { | |
4097
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5729 MemRegion used_mr = cur->used_region(); |
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5730 |
342 | 5731 // And the region is empty. |
4097
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5732 assert(!used_mr.is_empty(), "Should not have empty regions in a CS."); |
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5733 |
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5734 // If marking is in progress then clear any objects marked in |
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5735 // the current region. Note mark_in_progress() returns false, |
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5736 // even during an initial mark pause, until the set_marking_started() |
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5737 // call which takes place later in the pause. |
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5738 if (mark_in_progress()) { |
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5739 assert(!g1_policy()->during_initial_mark_pause(), "sanity"); |
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5740 _cm->nextMarkBitMap()->clearRange(used_mr); |
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5741 } |
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5742 |
2152 | 5743 free_region(cur, &pre_used, &local_free_list, false /* par */); |
342 | 5744 } else { |
5745 cur->uninstall_surv_rate_group(); | |
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5746 if (cur->is_young()) { |
342 | 5747 cur->set_young_index_in_cset(-1); |
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5748 } |
342 | 5749 cur->set_not_young(); |
5750 cur->set_evacuation_failed(false); | |
4072 | 5751 // The region is now considered to be old. |
5752 _old_set.add(cur); | |
342 | 5753 } |
5754 cur = next; | |
5755 } | |
5756 | |
5757 policy->record_max_rs_lengths(rs_lengths); | |
5758 policy->cset_regions_freed(); | |
5759 | |
5760 double end_sec = os::elapsedTime(); | |
5761 double elapsed_ms = (end_sec - start_sec) * 1000.0; | |
4097
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5762 |
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5763 if (non_young) { |
342 | 5764 non_young_time_ms += elapsed_ms; |
4097
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5765 } else { |
342 | 5766 young_time_ms += elapsed_ms; |
4097
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5767 } |
342 | 5768 |
2152 | 5769 update_sets_after_freeing_regions(pre_used, &local_free_list, |
4072 | 5770 NULL /* old_proxy_set */, |
2152 | 5771 NULL /* humongous_proxy_set */, |
5772 false /* par */); | |
342 | 5773 policy->record_young_free_cset_time_ms(young_time_ms); |
5774 policy->record_non_young_free_cset_time_ms(non_young_time_ms); | |
5775 } | |
5776 | |
1394
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5777 // This routine is similar to the above but does not record |
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5778 // any policy statistics or update free lists; we are abandoning |
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5779 // the current incremental collection set in preparation of a |
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5780 // full collection. After the full GC we will start to build up |
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|
5781 // the incremental collection set again. |
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5782 // This is only called when we're doing a full collection |
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5783 // and is immediately followed by the tearing down of the young list. |
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5784 |
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5785 void G1CollectedHeap::abandon_collection_set(HeapRegion* cs_head) { |
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5786 HeapRegion* cur = cs_head; |
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|
5787 |
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|
5788 while (cur != NULL) { |
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|
5789 HeapRegion* next = cur->next_in_collection_set(); |
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|
5790 assert(cur->in_collection_set(), "bad CS"); |
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5791 cur->set_next_in_collection_set(NULL); |
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5792 cur->set_in_collection_set(false); |
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|
5793 cur->set_young_index_in_cset(-1); |
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|
5794 cur = next; |
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|
5795 } |
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|
5796 } |
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|
5797 |
2152 | 5798 void G1CollectedHeap::set_free_regions_coming() { |
5799 if (G1ConcRegionFreeingVerbose) { | |
5800 gclog_or_tty->print_cr("G1ConcRegionFreeing [cm thread] : " | |
5801 "setting free regions coming"); | |
5802 } | |
5803 | |
5804 assert(!free_regions_coming(), "pre-condition"); | |
5805 _free_regions_coming = true; | |
342 | 5806 } |
5807 | |
2152 | 5808 void G1CollectedHeap::reset_free_regions_coming() { |
5809 { | |
5810 assert(free_regions_coming(), "pre-condition"); | |
5811 MutexLockerEx x(SecondaryFreeList_lock, Mutex::_no_safepoint_check_flag); | |
5812 _free_regions_coming = false; | |
5813 SecondaryFreeList_lock->notify_all(); | |
5814 } | |
5815 | |
5816 if (G1ConcRegionFreeingVerbose) { | |
5817 gclog_or_tty->print_cr("G1ConcRegionFreeing [cm thread] : " | |
5818 "reset free regions coming"); | |
342 | 5819 } |
5820 } | |
5821 | |
2152 | 5822 void G1CollectedHeap::wait_while_free_regions_coming() { |
5823 // Most of the time we won't have to wait, so let's do a quick test | |
5824 // first before we take the lock. | |
5825 if (!free_regions_coming()) { | |
5826 return; | |
5827 } | |
5828 | |
5829 if (G1ConcRegionFreeingVerbose) { | |
5830 gclog_or_tty->print_cr("G1ConcRegionFreeing [other] : " | |
5831 "waiting for free regions"); | |
342 | 5832 } |
5833 | |
5834 { | |
2152 | 5835 MutexLockerEx x(SecondaryFreeList_lock, Mutex::_no_safepoint_check_flag); |
5836 while (free_regions_coming()) { | |
5837 SecondaryFreeList_lock->wait(Mutex::_no_safepoint_check_flag); | |
342 | 5838 } |
2152 | 5839 } |
5840 | |
5841 if (G1ConcRegionFreeingVerbose) { | |
5842 gclog_or_tty->print_cr("G1ConcRegionFreeing [other] : " | |
5843 "done waiting for free regions"); | |
5844 } | |
342 | 5845 } |
5846 | |
5847 void G1CollectedHeap::set_region_short_lived_locked(HeapRegion* hr) { | |
5848 assert(heap_lock_held_for_gc(), | |
5849 "the heap lock should already be held by or for this thread"); | |
5850 _young_list->push_region(hr); | |
5851 } | |
5852 | |
5853 class NoYoungRegionsClosure: public HeapRegionClosure { | |
5854 private: | |
5855 bool _success; | |
5856 public: | |
5857 NoYoungRegionsClosure() : _success(true) { } | |
5858 bool doHeapRegion(HeapRegion* r) { | |
5859 if (r->is_young()) { | |
5860 gclog_or_tty->print_cr("Region ["PTR_FORMAT", "PTR_FORMAT") tagged as young", | |
5861 r->bottom(), r->end()); | |
5862 _success = false; | |
5863 } | |
5864 return false; | |
5865 } | |
5866 bool success() { return _success; } | |
5867 }; | |
5868 | |
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5869 bool G1CollectedHeap::check_young_list_empty(bool check_heap, bool check_sample) { |
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5870 bool ret = _young_list->check_list_empty(check_sample); |
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5871 |
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5872 if (check_heap) { |
342 | 5873 NoYoungRegionsClosure closure; |
5874 heap_region_iterate(&closure); | |
5875 ret = ret && closure.success(); | |
5876 } | |
5877 | |
5878 return ret; | |
5879 } | |
5880 | |
4072 | 5881 class TearDownRegionSetsClosure : public HeapRegionClosure { |
5882 private: | |
5883 OldRegionSet *_old_set; | |
2152 | 5884 |
342 | 5885 public: |
4072 | 5886 TearDownRegionSetsClosure(OldRegionSet* old_set) : _old_set(old_set) { } |
2152 | 5887 |
342 | 5888 bool doHeapRegion(HeapRegion* r) { |
4072 | 5889 if (r->is_empty()) { |
5890 // We ignore empty regions, we'll empty the free list afterwards | |
5891 } else if (r->is_young()) { | |
5892 // We ignore young regions, we'll empty the young list afterwards | |
5893 } else if (r->isHumongous()) { | |
5894 // We ignore humongous regions, we're not tearing down the | |
5895 // humongous region set | |
342 | 5896 } else { |
4072 | 5897 // The rest should be old |
5898 _old_set->remove(r); | |
342 | 5899 } |
5900 return false; | |
5901 } | |
5902 | |
4072 | 5903 ~TearDownRegionSetsClosure() { |
5904 assert(_old_set->is_empty(), "post-condition"); | |
2152 | 5905 } |
342 | 5906 }; |
5907 | |
4072 | 5908 void G1CollectedHeap::tear_down_region_sets(bool free_list_only) { |
5909 assert_at_safepoint(true /* should_be_vm_thread */); | |
5910 | |
5911 if (!free_list_only) { | |
5912 TearDownRegionSetsClosure cl(&_old_set); | |
5913 heap_region_iterate(&cl); | |
5914 | |
5915 // Need to do this after the heap iteration to be able to | |
5916 // recognize the young regions and ignore them during the iteration. | |
5917 _young_list->empty_list(); | |
5918 } | |
5919 _free_list.remove_all(); | |
5920 } | |
5921 | |
5922 class RebuildRegionSetsClosure : public HeapRegionClosure { | |
5923 private: | |
5924 bool _free_list_only; | |
5925 OldRegionSet* _old_set; | |
5926 FreeRegionList* _free_list; | |
5927 size_t _total_used; | |
5928 | |
5929 public: | |
5930 RebuildRegionSetsClosure(bool free_list_only, | |
5931 OldRegionSet* old_set, FreeRegionList* free_list) : | |
5932 _free_list_only(free_list_only), | |
5933 _old_set(old_set), _free_list(free_list), _total_used(0) { | |
5934 assert(_free_list->is_empty(), "pre-condition"); | |
5935 if (!free_list_only) { | |
5936 assert(_old_set->is_empty(), "pre-condition"); | |
5937 } | |
5938 } | |
5939 | |
5940 bool doHeapRegion(HeapRegion* r) { | |
5941 if (r->continuesHumongous()) { | |
5942 return false; | |
5943 } | |
5944 | |
5945 if (r->is_empty()) { | |
5946 // Add free regions to the free list | |
5947 _free_list->add_as_tail(r); | |
5948 } else if (!_free_list_only) { | |
5949 assert(!r->is_young(), "we should not come across young regions"); | |
5950 | |
5951 if (r->isHumongous()) { | |
5952 // We ignore humongous regions, we left the humongous set unchanged | |
5953 } else { | |
5954 // The rest should be old, add them to the old set | |
5955 _old_set->add(r); | |
5956 } | |
5957 _total_used += r->used(); | |
5958 } | |
5959 | |
5960 return false; | |
5961 } | |
5962 | |
5963 size_t total_used() { | |
5964 return _total_used; | |
5965 } | |
5966 }; | |
5967 | |
5968 void G1CollectedHeap::rebuild_region_sets(bool free_list_only) { | |
5969 assert_at_safepoint(true /* should_be_vm_thread */); | |
5970 | |
5971 RebuildRegionSetsClosure cl(free_list_only, &_old_set, &_free_list); | |
5972 heap_region_iterate(&cl); | |
5973 | |
5974 if (!free_list_only) { | |
5975 _summary_bytes_used = cl.total_used(); | |
5976 } | |
5977 assert(_summary_bytes_used == recalculate_used(), | |
5978 err_msg("inconsistent _summary_bytes_used, " | |
5979 "value: "SIZE_FORMAT" recalculated: "SIZE_FORMAT, | |
5980 _summary_bytes_used, recalculate_used())); | |
342 | 5981 } |
5982 | |
5983 void G1CollectedHeap::set_refine_cte_cl_concurrency(bool concurrent) { | |
5984 _refine_cte_cl->set_concurrent(concurrent); | |
5985 } | |
5986 | |
5987 bool G1CollectedHeap::is_in_closed_subset(const void* p) const { | |
5988 HeapRegion* hr = heap_region_containing(p); | |
5989 if (hr == NULL) { | |
5990 return is_in_permanent(p); | |
5991 } else { | |
5992 return hr->is_in(p); | |
5993 } | |
5994 } | |
2152 | 5995 |
3830
f44782f04dd4
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|
5996 // Methods for the mutator alloc region |
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|
5997 |
2433
abdfc822206f
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|
5998 HeapRegion* G1CollectedHeap::new_mutator_alloc_region(size_t word_size, |
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7023069: G1: Introduce symmetric locking in the slow allocation path
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|
5999 bool force) { |
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diff
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|
6000 assert_heap_locked_or_at_safepoint(true /* should_be_vm_thread */); |
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7023069: G1: Introduce symmetric locking in the slow allocation path
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diff
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|
6001 assert(!force || g1_policy()->can_expand_young_list(), |
abdfc822206f
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|
6002 "if force is true we should be able to expand the young list"); |
3778
5f6f2615433a
7049999: G1: Make the G1PrintHeapRegions output consistent and complete
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parents:
3777
diff
changeset
|
6003 bool young_list_full = g1_policy()->is_young_list_full(); |
5f6f2615433a
7049999: G1: Make the G1PrintHeapRegions output consistent and complete
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parents:
3777
diff
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|
6004 if (force || !young_list_full) { |
2433
abdfc822206f
7023069: G1: Introduce symmetric locking in the slow allocation path
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|
6005 HeapRegion* new_alloc_region = new_region(word_size, |
abdfc822206f
7023069: G1: Introduce symmetric locking in the slow allocation path
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diff
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|
6006 false /* do_expand */); |
abdfc822206f
7023069: G1: Introduce symmetric locking in the slow allocation path
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diff
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|
6007 if (new_alloc_region != NULL) { |
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7023069: G1: Introduce symmetric locking in the slow allocation path
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|
6008 set_region_short_lived_locked(new_alloc_region); |
3778
5f6f2615433a
7049999: G1: Make the G1PrintHeapRegions output consistent and complete
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parents:
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diff
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|
6009 _hr_printer.alloc(new_alloc_region, G1HRPrinter::Eden, young_list_full); |
2433
abdfc822206f
7023069: G1: Introduce symmetric locking in the slow allocation path
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|
6010 return new_alloc_region; |
abdfc822206f
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diff
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|
6011 } |
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diff
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|
6012 } |
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diff
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|
6013 return NULL; |
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diff
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|
6014 } |
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|
6015 |
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|
6016 void G1CollectedHeap::retire_mutator_alloc_region(HeapRegion* alloc_region, |
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|
6017 size_t allocated_bytes) { |
abdfc822206f
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|
6018 assert_heap_locked_or_at_safepoint(true /* should_be_vm_thread */); |
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|
6019 assert(alloc_region->is_young(), "all mutator alloc regions should be young"); |
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|
6020 |
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|
6021 g1_policy()->add_region_to_incremental_cset_lhs(alloc_region); |
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|
6022 _summary_bytes_used += allocated_bytes; |
3778
5f6f2615433a
7049999: G1: Make the G1PrintHeapRegions output consistent and complete
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parents:
3777
diff
changeset
|
6023 _hr_printer.retire(alloc_region); |
3980
8229bd737950
7075646: G1: fix inconsistencies in the monitoring data
tonyp
parents:
3979
diff
changeset
|
6024 // 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
|
6025 // 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
|
6026 // used space has been recored in _summary_bytes_used. |
8229bd737950
7075646: G1: fix inconsistencies in the monitoring data
tonyp
parents:
3979
diff
changeset
|
6027 g1mm()->update_eden_size(); |
2433
abdfc822206f
7023069: G1: Introduce symmetric locking in the slow allocation path
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|
6028 } |
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parents:
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diff
changeset
|
6029 |
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diff
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|
6030 HeapRegion* MutatorAllocRegion::allocate_new_region(size_t word_size, |
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|
6031 bool force) { |
abdfc822206f
7023069: G1: Introduce symmetric locking in the slow allocation path
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parents:
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diff
changeset
|
6032 return _g1h->new_mutator_alloc_region(word_size, force); |
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parents:
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|
6033 } |
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diff
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|
6034 |
4095
bca17e38de00
6593758: RFE: Enhance GC ergonomics to dynamically choose ParallelGCThreads
jmasa
parents:
4090
diff
changeset
|
6035 void G1CollectedHeap::set_par_threads() { |
bca17e38de00
6593758: RFE: Enhance GC ergonomics to dynamically choose ParallelGCThreads
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parents:
4090
diff
changeset
|
6036 // 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
|
6037 // in the workgroup. |
4711 | 6038 assert(G1CollectedHeap::use_parallel_gc_threads(), "shouldn't be here otherwise"); |
4728
441e946dc1af
7121618: Change type of number of GC workers to unsigned int.
jmasa
parents:
4711
diff
changeset
|
6039 uint n_workers = workers()->active_workers(); |
4711 | 6040 assert(UseDynamicNumberOfGCThreads || |
4095
bca17e38de00
6593758: RFE: Enhance GC ergonomics to dynamically choose ParallelGCThreads
jmasa
parents:
4090
diff
changeset
|
6041 n_workers == workers()->total_workers(), |
bca17e38de00
6593758: RFE: Enhance GC ergonomics to dynamically choose ParallelGCThreads
jmasa
parents:
4090
diff
changeset
|
6042 "Otherwise should be using the total number of workers"); |
bca17e38de00
6593758: RFE: Enhance GC ergonomics to dynamically choose ParallelGCThreads
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parents:
4090
diff
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|
6043 if (n_workers == 0) { |
bca17e38de00
6593758: RFE: Enhance GC ergonomics to dynamically choose ParallelGCThreads
jmasa
parents:
4090
diff
changeset
|
6044 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
|
6045 n_workers = ParallelGCThreads; |
bca17e38de00
6593758: RFE: Enhance GC ergonomics to dynamically choose ParallelGCThreads
jmasa
parents:
4090
diff
changeset
|
6046 workers()->set_active_workers(n_workers); |
bca17e38de00
6593758: RFE: Enhance GC ergonomics to dynamically choose ParallelGCThreads
jmasa
parents:
4090
diff
changeset
|
6047 } |
bca17e38de00
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jmasa
parents:
4090
diff
changeset
|
6048 set_par_threads(n_workers); |
bca17e38de00
6593758: RFE: Enhance GC ergonomics to dynamically choose ParallelGCThreads
jmasa
parents:
4090
diff
changeset
|
6049 } |
bca17e38de00
6593758: RFE: Enhance GC ergonomics to dynamically choose ParallelGCThreads
jmasa
parents:
4090
diff
changeset
|
6050 |
2433
abdfc822206f
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parents:
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diff
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|
6051 void MutatorAllocRegion::retire_region(HeapRegion* alloc_region, |
abdfc822206f
7023069: G1: Introduce symmetric locking in the slow allocation path
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parents:
2432
diff
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|
6052 size_t allocated_bytes) { |
abdfc822206f
7023069: G1: Introduce symmetric locking in the slow allocation path
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parents:
2432
diff
changeset
|
6053 _g1h->retire_mutator_alloc_region(alloc_region, allocated_bytes); |
abdfc822206f
7023069: G1: Introduce symmetric locking in the slow allocation path
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parents:
2432
diff
changeset
|
6054 } |
abdfc822206f
7023069: G1: Introduce symmetric locking in the slow allocation path
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parents:
2432
diff
changeset
|
6055 |
3830
f44782f04dd4
7039627: G1: avoid BOT updates for survivor allocations and dirty survivor regions incrementally
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3824
diff
changeset
|
6056 // Methods for the GC alloc regions |
f44782f04dd4
7039627: G1: avoid BOT updates for survivor allocations and dirty survivor regions incrementally
tonyp
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diff
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|
6057 |
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7039627: G1: avoid BOT updates for survivor allocations and dirty survivor regions incrementally
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|
6058 HeapRegion* G1CollectedHeap::new_gc_alloc_region(size_t word_size, |
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7039627: G1: avoid BOT updates for survivor allocations and dirty survivor regions incrementally
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diff
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|
6059 size_t count, |
f44782f04dd4
7039627: G1: avoid BOT updates for survivor allocations and dirty survivor regions incrementally
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parents:
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diff
changeset
|
6060 GCAllocPurpose ap) { |
f44782f04dd4
7039627: G1: avoid BOT updates for survivor allocations and dirty survivor regions incrementally
tonyp
parents:
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diff
changeset
|
6061 assert(FreeList_lock->owned_by_self(), "pre-condition"); |
f44782f04dd4
7039627: G1: avoid BOT updates for survivor allocations and dirty survivor regions incrementally
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parents:
3824
diff
changeset
|
6062 |
f44782f04dd4
7039627: G1: avoid BOT updates for survivor allocations and dirty survivor regions incrementally
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parents:
3824
diff
changeset
|
6063 if (count < g1_policy()->max_regions(ap)) { |
f44782f04dd4
7039627: G1: avoid BOT updates for survivor allocations and dirty survivor regions incrementally
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parents:
3824
diff
changeset
|
6064 HeapRegion* new_alloc_region = new_region(word_size, |
f44782f04dd4
7039627: G1: avoid BOT updates for survivor allocations and dirty survivor regions incrementally
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parents:
3824
diff
changeset
|
6065 true /* do_expand */); |
f44782f04dd4
7039627: G1: avoid BOT updates for survivor allocations and dirty survivor regions incrementally
tonyp
parents:
3824
diff
changeset
|
6066 if (new_alloc_region != NULL) { |
f44782f04dd4
7039627: G1: avoid BOT updates for survivor allocations and dirty survivor regions incrementally
tonyp
parents:
3824
diff
changeset
|
6067 // 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
|
6068 // 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
|
6069 // for survivors too. |
f44782f04dd4
7039627: G1: avoid BOT updates for survivor allocations and dirty survivor regions incrementally
tonyp
parents:
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diff
changeset
|
6070 new_alloc_region->set_saved_mark(); |
f44782f04dd4
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parents:
3824
diff
changeset
|
6071 if (ap == GCAllocForSurvived) { |
f44782f04dd4
7039627: G1: avoid BOT updates for survivor allocations and dirty survivor regions incrementally
tonyp
parents:
3824
diff
changeset
|
6072 new_alloc_region->set_survivor(); |
f44782f04dd4
7039627: G1: avoid BOT updates for survivor allocations and dirty survivor regions incrementally
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parents:
3824
diff
changeset
|
6073 _hr_printer.alloc(new_alloc_region, G1HRPrinter::Survivor); |
f44782f04dd4
7039627: G1: avoid BOT updates for survivor allocations and dirty survivor regions incrementally
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diff
changeset
|
6074 } else { |
f44782f04dd4
7039627: G1: avoid BOT updates for survivor allocations and dirty survivor regions incrementally
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parents:
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diff
changeset
|
6075 _hr_printer.alloc(new_alloc_region, G1HRPrinter::Old); |
f44782f04dd4
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parents:
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diff
changeset
|
6076 } |
f44782f04dd4
7039627: G1: avoid BOT updates for survivor allocations and dirty survivor regions incrementally
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parents:
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diff
changeset
|
6077 return new_alloc_region; |
f44782f04dd4
7039627: G1: avoid BOT updates for survivor allocations and dirty survivor regions incrementally
tonyp
parents:
3824
diff
changeset
|
6078 } else { |
f44782f04dd4
7039627: G1: avoid BOT updates for survivor allocations and dirty survivor regions incrementally
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parents:
3824
diff
changeset
|
6079 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
|
6080 } |
f44782f04dd4
7039627: G1: avoid BOT updates for survivor allocations and dirty survivor regions incrementally
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parents:
3824
diff
changeset
|
6081 } |
f44782f04dd4
7039627: G1: avoid BOT updates for survivor allocations and dirty survivor regions incrementally
tonyp
parents:
3824
diff
changeset
|
6082 return NULL; |
f44782f04dd4
7039627: G1: avoid BOT updates for survivor allocations and dirty survivor regions incrementally
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parents:
3824
diff
changeset
|
6083 } |
f44782f04dd4
7039627: G1: avoid BOT updates for survivor allocations and dirty survivor regions incrementally
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parents:
3824
diff
changeset
|
6084 |
f44782f04dd4
7039627: G1: avoid BOT updates for survivor allocations and dirty survivor regions incrementally
tonyp
parents:
3824
diff
changeset
|
6085 void G1CollectedHeap::retire_gc_alloc_region(HeapRegion* alloc_region, |
f44782f04dd4
7039627: G1: avoid BOT updates for survivor allocations and dirty survivor regions incrementally
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parents:
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diff
changeset
|
6086 size_t allocated_bytes, |
f44782f04dd4
7039627: G1: avoid BOT updates for survivor allocations and dirty survivor regions incrementally
tonyp
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diff
changeset
|
6087 GCAllocPurpose ap) { |
f44782f04dd4
7039627: G1: avoid BOT updates for survivor allocations and dirty survivor regions incrementally
tonyp
parents:
3824
diff
changeset
|
6088 alloc_region->note_end_of_copying(); |
f44782f04dd4
7039627: G1: avoid BOT updates for survivor allocations and dirty survivor regions incrementally
tonyp
parents:
3824
diff
changeset
|
6089 g1_policy()->record_bytes_copied_during_gc(allocated_bytes); |
f44782f04dd4
7039627: G1: avoid BOT updates for survivor allocations and dirty survivor regions incrementally
tonyp
parents:
3824
diff
changeset
|
6090 if (ap == GCAllocForSurvived) { |
f44782f04dd4
7039627: G1: avoid BOT updates for survivor allocations and dirty survivor regions incrementally
tonyp
parents:
3824
diff
changeset
|
6091 young_list()->add_survivor_region(alloc_region); |
4072 | 6092 } else { |
6093 _old_set.add(alloc_region); | |
3830
f44782f04dd4
7039627: G1: avoid BOT updates for survivor allocations and dirty survivor regions incrementally
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parents:
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diff
changeset
|
6094 } |
f44782f04dd4
7039627: G1: avoid BOT updates for survivor allocations and dirty survivor regions incrementally
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diff
changeset
|
6095 _hr_printer.retire(alloc_region); |
f44782f04dd4
7039627: G1: avoid BOT updates for survivor allocations and dirty survivor regions incrementally
tonyp
parents:
3824
diff
changeset
|
6096 } |
f44782f04dd4
7039627: G1: avoid BOT updates for survivor allocations and dirty survivor regions incrementally
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parents:
3824
diff
changeset
|
6097 |
f44782f04dd4
7039627: G1: avoid BOT updates for survivor allocations and dirty survivor regions incrementally
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parents:
3824
diff
changeset
|
6098 HeapRegion* SurvivorGCAllocRegion::allocate_new_region(size_t word_size, |
f44782f04dd4
7039627: G1: avoid BOT updates for survivor allocations and dirty survivor regions incrementally
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parents:
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diff
changeset
|
6099 bool force) { |
f44782f04dd4
7039627: G1: avoid BOT updates for survivor allocations and dirty survivor regions incrementally
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parents:
3824
diff
changeset
|
6100 assert(!force, "not supported for GC alloc regions"); |
f44782f04dd4
7039627: G1: avoid BOT updates for survivor allocations and dirty survivor regions incrementally
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3824
diff
changeset
|
6101 return _g1h->new_gc_alloc_region(word_size, count(), GCAllocForSurvived); |
f44782f04dd4
7039627: G1: avoid BOT updates for survivor allocations and dirty survivor regions incrementally
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diff
changeset
|
6102 } |
f44782f04dd4
7039627: G1: avoid BOT updates for survivor allocations and dirty survivor regions incrementally
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parents:
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diff
changeset
|
6103 |
f44782f04dd4
7039627: G1: avoid BOT updates for survivor allocations and dirty survivor regions incrementally
tonyp
parents:
3824
diff
changeset
|
6104 void SurvivorGCAllocRegion::retire_region(HeapRegion* alloc_region, |
f44782f04dd4
7039627: G1: avoid BOT updates for survivor allocations and dirty survivor regions incrementally
tonyp
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diff
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|
6105 size_t allocated_bytes) { |
f44782f04dd4
7039627: G1: avoid BOT updates for survivor allocations and dirty survivor regions incrementally
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parents:
3824
diff
changeset
|
6106 _g1h->retire_gc_alloc_region(alloc_region, allocated_bytes, |
f44782f04dd4
7039627: G1: avoid BOT updates for survivor allocations and dirty survivor regions incrementally
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diff
changeset
|
6107 GCAllocForSurvived); |
f44782f04dd4
7039627: G1: avoid BOT updates for survivor allocations and dirty survivor regions incrementally
tonyp
parents:
3824
diff
changeset
|
6108 } |
f44782f04dd4
7039627: G1: avoid BOT updates for survivor allocations and dirty survivor regions incrementally
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parents:
3824
diff
changeset
|
6109 |
f44782f04dd4
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diff
changeset
|
6110 HeapRegion* OldGCAllocRegion::allocate_new_region(size_t word_size, |
f44782f04dd4
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diff
changeset
|
6111 bool force) { |
f44782f04dd4
7039627: G1: avoid BOT updates for survivor allocations and dirty survivor regions incrementally
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parents:
3824
diff
changeset
|
6112 assert(!force, "not supported for GC alloc regions"); |
f44782f04dd4
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parents:
3824
diff
changeset
|
6113 return _g1h->new_gc_alloc_region(word_size, count(), GCAllocForTenured); |
f44782f04dd4
7039627: G1: avoid BOT updates for survivor allocations and dirty survivor regions incrementally
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diff
changeset
|
6114 } |
f44782f04dd4
7039627: G1: avoid BOT updates for survivor allocations and dirty survivor regions incrementally
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diff
changeset
|
6115 |
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6116 void OldGCAllocRegion::retire_region(HeapRegion* alloc_region, |
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6117 size_t allocated_bytes) { |
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6118 _g1h->retire_gc_alloc_region(alloc_region, allocated_bytes, |
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6119 GCAllocForTenured); |
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6120 } |
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6121 // Heap region set verification |
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6122 |
2152 | 6123 class VerifyRegionListsClosure : public HeapRegionClosure { |
6124 private: | |
4072 | 6125 FreeRegionList* _free_list; |
6126 OldRegionSet* _old_set; | |
2152 | 6127 HumongousRegionSet* _humongous_set; |
6128 size_t _region_count; | |
6129 | |
6130 public: | |
4072 | 6131 VerifyRegionListsClosure(OldRegionSet* old_set, |
6132 HumongousRegionSet* humongous_set, | |
2152 | 6133 FreeRegionList* free_list) : |
4072 | 6134 _old_set(old_set), _humongous_set(humongous_set), |
6135 _free_list(free_list), _region_count(0) { } | |
2152 | 6136 |
6137 size_t region_count() { return _region_count; } | |
6138 | |
6139 bool doHeapRegion(HeapRegion* hr) { | |
6140 _region_count += 1; | |
6141 | |
6142 if (hr->continuesHumongous()) { | |
6143 return false; | |
6144 } | |
6145 | |
6146 if (hr->is_young()) { | |
6147 // TODO | |
6148 } else if (hr->startsHumongous()) { | |
6149 _humongous_set->verify_next_region(hr); | |
6150 } else if (hr->is_empty()) { | |
6151 _free_list->verify_next_region(hr); | |
4072 | 6152 } else { |
6153 _old_set->verify_next_region(hr); | |
2152 | 6154 } |
6155 return false; | |
6156 } | |
6157 }; | |
6158 | |
3766 | 6159 HeapRegion* G1CollectedHeap::new_heap_region(size_t hrs_index, |
6160 HeapWord* bottom) { | |
6161 HeapWord* end = bottom + HeapRegion::GrainWords; | |
6162 MemRegion mr(bottom, end); | |
6163 assert(_g1_reserved.contains(mr), "invariant"); | |
6164 // This might return NULL if the allocation fails | |
6165 return new HeapRegion(hrs_index, _bot_shared, mr, true /* is_zeroed */); | |
6166 } | |
6167 | |
2152 | 6168 void G1CollectedHeap::verify_region_sets() { |
6169 assert_heap_locked_or_at_safepoint(true /* should_be_vm_thread */); | |
6170 | |
6171 // First, check the explicit lists. | |
6172 _free_list.verify(); | |
6173 { | |
6174 // Given that a concurrent operation might be adding regions to | |
6175 // the secondary free list we have to take the lock before | |
6176 // verifying it. | |
6177 MutexLockerEx x(SecondaryFreeList_lock, Mutex::_no_safepoint_check_flag); | |
6178 _secondary_free_list.verify(); | |
6179 } | |
4072 | 6180 _old_set.verify(); |
2152 | 6181 _humongous_set.verify(); |
6182 | |
6183 // If a concurrent region freeing operation is in progress it will | |
6184 // be difficult to correctly attributed any free regions we come | |
6185 // across to the correct free list given that they might belong to | |
6186 // one of several (free_list, secondary_free_list, any local lists, | |
6187 // etc.). So, if that's the case we will skip the rest of the | |
6188 // verification operation. Alternatively, waiting for the concurrent | |
6189 // operation to complete will have a non-trivial effect on the GC's | |
6190 // operation (no concurrent operation will last longer than the | |
6191 // interval between two calls to verification) and it might hide | |
6192 // any issues that we would like to catch during testing. | |
6193 if (free_regions_coming()) { | |
6194 return; | |
6195 } | |
6196 | |
2361 | 6197 // Make sure we append the secondary_free_list on the free_list so |
6198 // that all free regions we will come across can be safely | |
6199 // attributed to the free_list. | |
6200 append_secondary_free_list_if_not_empty_with_lock(); | |
2152 | 6201 |
6202 // Finally, make sure that the region accounting in the lists is | |
6203 // consistent with what we see in the heap. | |
4072 | 6204 _old_set.verify_start(); |
2152 | 6205 _humongous_set.verify_start(); |
6206 _free_list.verify_start(); | |
6207 | |
4072 | 6208 VerifyRegionListsClosure cl(&_old_set, &_humongous_set, &_free_list); |
2152 | 6209 heap_region_iterate(&cl); |
6210 | |
4072 | 6211 _old_set.verify_end(); |
2152 | 6212 _humongous_set.verify_end(); |
6213 _free_list.verify_end(); | |
342 | 6214 } |