Mercurial > hg > truffle
annotate src/share/vm/gc_implementation/g1/g1CollectedHeap.cpp @ 6120:37552638d24a
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Reviewed-by: azeemj, jmasa
| author | brutisso |
|---|---|
| date | Tue, 05 Jun 2012 22:30:24 +0200 |
| parents | bbc900c2482a |
| children | b9442ac22f59 |
| rev | line source |
|---|---|
| 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" |
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36 #include "gc_implementation/g1/g1Log.hpp" |
| 1972 | 37 #include "gc_implementation/g1/g1MarkSweep.hpp" |
| 38 #include "gc_implementation/g1/g1OopClosures.inline.hpp" | |
| 39 #include "gc_implementation/g1/g1RemSet.inline.hpp" | |
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40 #include "gc_implementation/g1/heapRegion.inline.hpp" |
| 1972 | 41 #include "gc_implementation/g1/heapRegionRemSet.hpp" |
| 42 #include "gc_implementation/g1/heapRegionSeq.inline.hpp" | |
| 43 #include "gc_implementation/g1/vm_operations_g1.hpp" | |
| 44 #include "gc_implementation/shared/isGCActiveMark.hpp" | |
| 45 #include "memory/gcLocker.inline.hpp" | |
| 46 #include "memory/genOopClosures.inline.hpp" | |
| 47 #include "memory/generationSpec.hpp" | |
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48 #include "memory/referenceProcessor.hpp" |
| 1972 | 49 #include "oops/oop.inline.hpp" |
| 50 #include "oops/oop.pcgc.inline.hpp" | |
| 51 #include "runtime/aprofiler.hpp" | |
| 52 #include "runtime/vmThread.hpp" | |
| 342 | 53 |
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54 size_t G1CollectedHeap::_humongous_object_threshold_in_words = 0; |
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55 |
| 342 | 56 // turn it on so that the contents of the young list (scan-only / |
| 57 // to-be-collected) are printed at "strategic" points before / during | |
| 58 // / after the collection --- this is useful for debugging | |
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59 #define YOUNG_LIST_VERBOSE 0 |
| 342 | 60 // CURRENT STATUS |
| 61 // This file is under construction. Search for "FIXME". | |
| 62 | |
| 63 // INVARIANTS/NOTES | |
| 64 // | |
| 65 // All allocation activity covered by the G1CollectedHeap interface is | |
| 1973 | 66 // serialized by acquiring the HeapLock. This happens in mem_allocate |
| 67 // and allocate_new_tlab, which are the "entry" points to the | |
| 68 // allocation code from the rest of the JVM. (Note that this does not | |
| 69 // apply to TLAB allocation, which is not part of this interface: it | |
| 70 // is done by clients of this interface.) | |
| 342 | 71 |
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72 // Notes on implementation of parallelism in different tasks. |
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73 // |
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74 // G1ParVerifyTask uses heap_region_par_iterate_chunked() for parallelism. |
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75 // The number of GC workers is passed to heap_region_par_iterate_chunked(). |
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76 // It does use run_task() which sets _n_workers in the task. |
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77 // G1ParTask executes g1_process_strong_roots() -> |
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78 // SharedHeap::process_strong_roots() which calls eventuall to |
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79 // CardTableModRefBS::par_non_clean_card_iterate_work() which uses |
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80 // SequentialSubTasksDone. SharedHeap::process_strong_roots() also |
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81 // directly uses SubTasksDone (_process_strong_tasks field in SharedHeap). |
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82 // |
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83 |
| 342 | 84 // Local to this file. |
| 85 | |
| 86 class RefineCardTableEntryClosure: public CardTableEntryClosure { | |
| 87 SuspendibleThreadSet* _sts; | |
| 88 G1RemSet* _g1rs; | |
| 89 ConcurrentG1Refine* _cg1r; | |
| 90 bool _concurrent; | |
| 91 public: | |
| 92 RefineCardTableEntryClosure(SuspendibleThreadSet* sts, | |
| 93 G1RemSet* g1rs, | |
| 94 ConcurrentG1Refine* cg1r) : | |
| 95 _sts(sts), _g1rs(g1rs), _cg1r(cg1r), _concurrent(true) | |
| 96 {} | |
| 97 bool do_card_ptr(jbyte* card_ptr, int worker_i) { | |
| 1705 | 98 bool oops_into_cset = _g1rs->concurrentRefineOneCard(card_ptr, worker_i, false); |
| 99 // This path is executed by the concurrent refine or mutator threads, | |
| 100 // concurrently, and so we do not care if card_ptr contains references | |
| 101 // that point into the collection set. | |
| 102 assert(!oops_into_cset, "should be"); | |
| 103 | |
| 342 | 104 if (_concurrent && _sts->should_yield()) { |
| 105 // Caller will actually yield. | |
| 106 return false; | |
| 107 } | |
| 108 // Otherwise, we finished successfully; return true. | |
| 109 return true; | |
| 110 } | |
| 111 void set_concurrent(bool b) { _concurrent = b; } | |
| 112 }; | |
| 113 | |
| 114 | |
| 115 class ClearLoggedCardTableEntryClosure: public CardTableEntryClosure { | |
| 116 int _calls; | |
| 117 G1CollectedHeap* _g1h; | |
| 118 CardTableModRefBS* _ctbs; | |
| 119 int _histo[256]; | |
| 120 public: | |
| 121 ClearLoggedCardTableEntryClosure() : | |
| 122 _calls(0) | |
| 123 { | |
| 124 _g1h = G1CollectedHeap::heap(); | |
| 125 _ctbs = (CardTableModRefBS*)_g1h->barrier_set(); | |
| 126 for (int i = 0; i < 256; i++) _histo[i] = 0; | |
| 127 } | |
| 128 bool do_card_ptr(jbyte* card_ptr, int worker_i) { | |
| 129 if (_g1h->is_in_reserved(_ctbs->addr_for(card_ptr))) { | |
| 130 _calls++; | |
| 131 unsigned char* ujb = (unsigned char*)card_ptr; | |
| 132 int ind = (int)(*ujb); | |
| 133 _histo[ind]++; | |
| 134 *card_ptr = -1; | |
| 135 } | |
| 136 return true; | |
| 137 } | |
| 138 int calls() { return _calls; } | |
| 139 void print_histo() { | |
| 140 gclog_or_tty->print_cr("Card table value histogram:"); | |
| 141 for (int i = 0; i < 256; i++) { | |
| 142 if (_histo[i] != 0) { | |
| 143 gclog_or_tty->print_cr(" %d: %d", i, _histo[i]); | |
| 144 } | |
| 145 } | |
| 146 } | |
| 147 }; | |
| 148 | |
| 149 class RedirtyLoggedCardTableEntryClosure: public CardTableEntryClosure { | |
| 150 int _calls; | |
| 151 G1CollectedHeap* _g1h; | |
| 152 CardTableModRefBS* _ctbs; | |
| 153 public: | |
| 154 RedirtyLoggedCardTableEntryClosure() : | |
| 155 _calls(0) | |
| 156 { | |
| 157 _g1h = G1CollectedHeap::heap(); | |
| 158 _ctbs = (CardTableModRefBS*)_g1h->barrier_set(); | |
| 159 } | |
| 160 bool do_card_ptr(jbyte* card_ptr, int worker_i) { | |
| 161 if (_g1h->is_in_reserved(_ctbs->addr_for(card_ptr))) { | |
| 162 _calls++; | |
| 163 *card_ptr = 0; | |
| 164 } | |
| 165 return true; | |
| 166 } | |
| 167 int calls() { return _calls; } | |
| 168 }; | |
| 169 | |
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170 class RedirtyLoggedCardTableEntryFastClosure : public CardTableEntryClosure { |
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171 public: |
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172 bool do_card_ptr(jbyte* card_ptr, int worker_i) { |
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173 *card_ptr = CardTableModRefBS::dirty_card_val(); |
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174 return true; |
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175 } |
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176 }; |
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177 |
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178 YoungList::YoungList(G1CollectedHeap* g1h) : |
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179 _g1h(g1h), _head(NULL), _length(0), _last_sampled_rs_lengths(0), |
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180 _survivor_head(NULL), _survivor_tail(NULL), _survivor_length(0) { |
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181 guarantee(check_list_empty(false), "just making sure..."); |
| 342 | 182 } |
| 183 | |
| 184 void YoungList::push_region(HeapRegion *hr) { | |
| 185 assert(!hr->is_young(), "should not already be young"); | |
| 186 assert(hr->get_next_young_region() == NULL, "cause it should!"); | |
| 187 | |
| 188 hr->set_next_young_region(_head); | |
| 189 _head = hr; | |
| 190 | |
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191 _g1h->g1_policy()->set_region_eden(hr, (int) _length); |
| 342 | 192 ++_length; |
| 193 } | |
| 194 | |
| 195 void YoungList::add_survivor_region(HeapRegion* hr) { | |
| 545 | 196 assert(hr->is_survivor(), "should be flagged as survivor region"); |
| 342 | 197 assert(hr->get_next_young_region() == NULL, "cause it should!"); |
| 198 | |
| 199 hr->set_next_young_region(_survivor_head); | |
| 200 if (_survivor_head == NULL) { | |
| 545 | 201 _survivor_tail = hr; |
| 342 | 202 } |
| 203 _survivor_head = hr; | |
| 204 ++_survivor_length; | |
| 205 } | |
| 206 | |
| 207 void YoungList::empty_list(HeapRegion* list) { | |
| 208 while (list != NULL) { | |
| 209 HeapRegion* next = list->get_next_young_region(); | |
| 210 list->set_next_young_region(NULL); | |
| 211 list->uninstall_surv_rate_group(); | |
| 212 list->set_not_young(); | |
| 213 list = next; | |
| 214 } | |
| 215 } | |
| 216 | |
| 217 void YoungList::empty_list() { | |
| 218 assert(check_list_well_formed(), "young list should be well formed"); | |
| 219 | |
| 220 empty_list(_head); | |
| 221 _head = NULL; | |
| 222 _length = 0; | |
| 223 | |
| 224 empty_list(_survivor_head); | |
| 225 _survivor_head = NULL; | |
| 545 | 226 _survivor_tail = NULL; |
| 342 | 227 _survivor_length = 0; |
| 228 | |
| 229 _last_sampled_rs_lengths = 0; | |
| 230 | |
| 231 assert(check_list_empty(false), "just making sure..."); | |
| 232 } | |
| 233 | |
| 234 bool YoungList::check_list_well_formed() { | |
| 235 bool ret = true; | |
| 236 | |
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237 uint length = 0; |
| 342 | 238 HeapRegion* curr = _head; |
| 239 HeapRegion* last = NULL; | |
| 240 while (curr != NULL) { | |
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241 if (!curr->is_young()) { |
| 342 | 242 gclog_or_tty->print_cr("### YOUNG REGION "PTR_FORMAT"-"PTR_FORMAT" " |
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243 "incorrectly tagged (y: %d, surv: %d)", |
| 342 | 244 curr->bottom(), curr->end(), |
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245 curr->is_young(), curr->is_survivor()); |
| 342 | 246 ret = false; |
| 247 } | |
| 248 ++length; | |
| 249 last = curr; | |
| 250 curr = curr->get_next_young_region(); | |
| 251 } | |
| 252 ret = ret && (length == _length); | |
| 253 | |
| 254 if (!ret) { | |
| 255 gclog_or_tty->print_cr("### YOUNG LIST seems not well formed!"); | |
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256 gclog_or_tty->print_cr("### list has %u entries, _length is %u", |
| 342 | 257 length, _length); |
| 258 } | |
| 259 | |
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260 return ret; |
| 342 | 261 } |
| 262 | |
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263 bool YoungList::check_list_empty(bool check_sample) { |
| 342 | 264 bool ret = true; |
| 265 | |
| 266 if (_length != 0) { | |
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267 gclog_or_tty->print_cr("### YOUNG LIST should have 0 length, not %u", |
| 342 | 268 _length); |
| 269 ret = false; | |
| 270 } | |
| 271 if (check_sample && _last_sampled_rs_lengths != 0) { | |
| 272 gclog_or_tty->print_cr("### YOUNG LIST has non-zero last sampled RS lengths"); | |
| 273 ret = false; | |
| 274 } | |
| 275 if (_head != NULL) { | |
| 276 gclog_or_tty->print_cr("### YOUNG LIST does not have a NULL head"); | |
| 277 ret = false; | |
| 278 } | |
| 279 if (!ret) { | |
| 280 gclog_or_tty->print_cr("### YOUNG LIST does not seem empty"); | |
| 281 } | |
| 282 | |
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283 return ret; |
| 342 | 284 } |
| 285 | |
| 286 void | |
| 287 YoungList::rs_length_sampling_init() { | |
| 288 _sampled_rs_lengths = 0; | |
| 289 _curr = _head; | |
| 290 } | |
| 291 | |
| 292 bool | |
| 293 YoungList::rs_length_sampling_more() { | |
| 294 return _curr != NULL; | |
| 295 } | |
| 296 | |
| 297 void | |
| 298 YoungList::rs_length_sampling_next() { | |
| 299 assert( _curr != NULL, "invariant" ); | |
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300 size_t rs_length = _curr->rem_set()->occupied(); |
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301 |
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302 _sampled_rs_lengths += rs_length; |
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303 |
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304 // The current region may not yet have been added to the |
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305 // incremental collection set (it gets added when it is |
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306 // retired as the current allocation region). |
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307 if (_curr->in_collection_set()) { |
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308 // Update the collection set policy information for this region |
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309 _g1h->g1_policy()->update_incremental_cset_info(_curr, rs_length); |
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310 } |
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311 |
| 342 | 312 _curr = _curr->get_next_young_region(); |
| 313 if (_curr == NULL) { | |
| 314 _last_sampled_rs_lengths = _sampled_rs_lengths; | |
| 315 // gclog_or_tty->print_cr("last sampled RS lengths = %d", _last_sampled_rs_lengths); | |
| 316 } | |
| 317 } | |
| 318 | |
| 319 void | |
| 320 YoungList::reset_auxilary_lists() { | |
| 321 guarantee( is_empty(), "young list should be empty" ); | |
| 322 assert(check_list_well_formed(), "young list should be well formed"); | |
| 323 | |
| 324 // Add survivor regions to SurvRateGroup. | |
| 325 _g1h->g1_policy()->note_start_adding_survivor_regions(); | |
| 545 | 326 _g1h->g1_policy()->finished_recalculating_age_indexes(true /* is_survivors */); |
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327 |
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328 int young_index_in_cset = 0; |
| 342 | 329 for (HeapRegion* curr = _survivor_head; |
| 330 curr != NULL; | |
| 331 curr = curr->get_next_young_region()) { | |
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332 _g1h->g1_policy()->set_region_survivor(curr, young_index_in_cset); |
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333 |
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334 // The region is a non-empty survivor so let's add it to |
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335 // the incremental collection set for the next evacuation |
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336 // pause. |
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337 _g1h->g1_policy()->add_region_to_incremental_cset_rhs(curr); |
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338 young_index_in_cset += 1; |
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339 } |
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340 assert((uint) young_index_in_cset == _survivor_length, "post-condition"); |
| 342 | 341 _g1h->g1_policy()->note_stop_adding_survivor_regions(); |
| 342 | |
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343 _head = _survivor_head; |
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344 _length = _survivor_length; |
| 342 | 345 if (_survivor_head != NULL) { |
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346 assert(_survivor_tail != NULL, "cause it shouldn't be"); |
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347 assert(_survivor_length > 0, "invariant"); |
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348 _survivor_tail->set_next_young_region(NULL); |
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349 } |
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350 |
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351 // Don't clear the survivor list handles until the start of |
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352 // the next evacuation pause - we need it in order to re-tag |
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353 // the survivor regions from this evacuation pause as 'young' |
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354 // at the start of the next. |
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355 |
| 545 | 356 _g1h->g1_policy()->finished_recalculating_age_indexes(false /* is_survivors */); |
| 342 | 357 |
| 358 assert(check_list_well_formed(), "young list should be well formed"); | |
| 359 } | |
| 360 | |
| 361 void YoungList::print() { | |
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362 HeapRegion* lists[] = {_head, _survivor_head}; |
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363 const char* names[] = {"YOUNG", "SURVIVOR"}; |
| 342 | 364 |
| 365 for (unsigned int list = 0; list < ARRAY_SIZE(lists); ++list) { | |
| 366 gclog_or_tty->print_cr("%s LIST CONTENTS", names[list]); | |
| 367 HeapRegion *curr = lists[list]; | |
| 368 if (curr == NULL) | |
| 369 gclog_or_tty->print_cr(" empty"); | |
| 370 while (curr != NULL) { | |
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371 gclog_or_tty->print_cr(" "HR_FORMAT", P: "PTR_FORMAT "N: "PTR_FORMAT", age: %4d", |
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372 HR_FORMAT_PARAMS(curr), |
| 342 | 373 curr->prev_top_at_mark_start(), |
| 374 curr->next_top_at_mark_start(), | |
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375 curr->age_in_surv_rate_group_cond()); |
| 342 | 376 curr = curr->get_next_young_region(); |
| 377 } | |
| 378 } | |
| 379 | |
| 380 gclog_or_tty->print_cr(""); | |
| 381 } | |
| 382 | |
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383 void G1CollectedHeap::push_dirty_cards_region(HeapRegion* hr) |
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384 { |
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385 // Claim the right to put the region on the dirty cards region list |
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386 // by installing a self pointer. |
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387 HeapRegion* next = hr->get_next_dirty_cards_region(); |
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388 if (next == NULL) { |
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389 HeapRegion* res = (HeapRegion*) |
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390 Atomic::cmpxchg_ptr(hr, hr->next_dirty_cards_region_addr(), |
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391 NULL); |
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392 if (res == NULL) { |
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393 HeapRegion* head; |
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394 do { |
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395 // Put the region to the dirty cards region list. |
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396 head = _dirty_cards_region_list; |
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397 next = (HeapRegion*) |
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398 Atomic::cmpxchg_ptr(hr, &_dirty_cards_region_list, head); |
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399 if (next == head) { |
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400 assert(hr->get_next_dirty_cards_region() == hr, |
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401 "hr->get_next_dirty_cards_region() != hr"); |
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402 if (next == NULL) { |
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403 // The last region in the list points to itself. |
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404 hr->set_next_dirty_cards_region(hr); |
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405 } else { |
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406 hr->set_next_dirty_cards_region(next); |
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407 } |
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408 } |
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409 } while (next != head); |
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410 } |
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411 } |
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412 } |
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413 |
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414 HeapRegion* G1CollectedHeap::pop_dirty_cards_region() |
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415 { |
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416 HeapRegion* head; |
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417 HeapRegion* hr; |
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418 do { |
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419 head = _dirty_cards_region_list; |
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420 if (head == NULL) { |
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421 return NULL; |
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422 } |
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423 HeapRegion* new_head = head->get_next_dirty_cards_region(); |
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424 if (head == new_head) { |
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425 // The last region. |
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426 new_head = NULL; |
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427 } |
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428 hr = (HeapRegion*)Atomic::cmpxchg_ptr(new_head, &_dirty_cards_region_list, |
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429 head); |
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430 } while (hr != head); |
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431 assert(hr != NULL, "invariant"); |
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432 hr->set_next_dirty_cards_region(NULL); |
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433 return hr; |
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434 } |
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435 |
| 342 | 436 void G1CollectedHeap::stop_conc_gc_threads() { |
| 794 | 437 _cg1r->stop(); |
| 342 | 438 _cmThread->stop(); |
| 439 } | |
| 440 | |
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441 #ifdef ASSERT |
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442 // A region is added to the collection set as it is retired |
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443 // so an address p can point to a region which will be in the |
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444 // collection set but has not yet been retired. This method |
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445 // therefore is only accurate during a GC pause after all |
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446 // regions have been retired. It is used for debugging |
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447 // to check if an nmethod has references to objects that can |
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448 // be move during a partial collection. Though it can be |
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449 // inaccurate, it is sufficient for G1 because the conservative |
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450 // implementation of is_scavengable() for G1 will indicate that |
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451 // all nmethods must be scanned during a partial collection. |
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452 bool G1CollectedHeap::is_in_partial_collection(const void* p) { |
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453 HeapRegion* hr = heap_region_containing(p); |
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454 return hr != NULL && hr->in_collection_set(); |
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455 } |
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456 #endif |
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457 |
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458 // Returns true if the reference points to an object that |
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459 // can move in an incremental collecction. |
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460 bool G1CollectedHeap::is_scavengable(const void* p) { |
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461 G1CollectedHeap* g1h = G1CollectedHeap::heap(); |
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462 G1CollectorPolicy* g1p = g1h->g1_policy(); |
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463 HeapRegion* hr = heap_region_containing(p); |
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464 if (hr == NULL) { |
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465 // perm gen (or null) |
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466 return false; |
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467 } else { |
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468 return !hr->isHumongous(); |
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469 } |
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470 } |
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471 |
| 342 | 472 void G1CollectedHeap::check_ct_logs_at_safepoint() { |
| 473 DirtyCardQueueSet& dcqs = JavaThread::dirty_card_queue_set(); | |
| 474 CardTableModRefBS* ct_bs = (CardTableModRefBS*)barrier_set(); | |
| 475 | |
| 476 // Count the dirty cards at the start. | |
| 477 CountNonCleanMemRegionClosure count1(this); | |
| 478 ct_bs->mod_card_iterate(&count1); | |
| 479 int orig_count = count1.n(); | |
| 480 | |
| 481 // First clear the logged cards. | |
| 482 ClearLoggedCardTableEntryClosure clear; | |
| 483 dcqs.set_closure(&clear); | |
| 484 dcqs.apply_closure_to_all_completed_buffers(); | |
| 485 dcqs.iterate_closure_all_threads(false); | |
| 486 clear.print_histo(); | |
| 487 | |
| 488 // Now ensure that there's no dirty cards. | |
| 489 CountNonCleanMemRegionClosure count2(this); | |
| 490 ct_bs->mod_card_iterate(&count2); | |
| 491 if (count2.n() != 0) { | |
| 492 gclog_or_tty->print_cr("Card table has %d entries; %d originally", | |
| 493 count2.n(), orig_count); | |
| 494 } | |
| 495 guarantee(count2.n() == 0, "Card table should be clean."); | |
| 496 | |
| 497 RedirtyLoggedCardTableEntryClosure redirty; | |
| 498 JavaThread::dirty_card_queue_set().set_closure(&redirty); | |
| 499 dcqs.apply_closure_to_all_completed_buffers(); | |
| 500 dcqs.iterate_closure_all_threads(false); | |
| 501 gclog_or_tty->print_cr("Log entries = %d, dirty cards = %d.", | |
| 502 clear.calls(), orig_count); | |
| 503 guarantee(redirty.calls() == clear.calls(), | |
| 504 "Or else mechanism is broken."); | |
| 505 | |
| 506 CountNonCleanMemRegionClosure count3(this); | |
| 507 ct_bs->mod_card_iterate(&count3); | |
| 508 if (count3.n() != orig_count) { | |
| 509 gclog_or_tty->print_cr("Should have restored them all: orig = %d, final = %d.", | |
| 510 orig_count, count3.n()); | |
| 511 guarantee(count3.n() >= orig_count, "Should have restored them all."); | |
| 512 } | |
| 513 | |
| 514 JavaThread::dirty_card_queue_set().set_closure(_refine_cte_cl); | |
| 515 } | |
| 516 | |
| 517 // Private class members. | |
| 518 | |
| 519 G1CollectedHeap* G1CollectedHeap::_g1h; | |
| 520 | |
| 521 // Private methods. | |
| 522 | |
| 2152 | 523 HeapRegion* |
| 2361 | 524 G1CollectedHeap::new_region_try_secondary_free_list() { |
| 2152 | 525 MutexLockerEx x(SecondaryFreeList_lock, Mutex::_no_safepoint_check_flag); |
| 526 while (!_secondary_free_list.is_empty() || free_regions_coming()) { | |
| 527 if (!_secondary_free_list.is_empty()) { | |
| 528 if (G1ConcRegionFreeingVerbose) { | |
| 529 gclog_or_tty->print_cr("G1ConcRegionFreeing [region alloc] : " | |
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530 "secondary_free_list has %u entries", |
| 2152 | 531 _secondary_free_list.length()); |
| 532 } | |
| 533 // It looks as if there are free regions available on the | |
| 534 // secondary_free_list. Let's move them to the free_list and try | |
| 535 // again to allocate from it. | |
| 536 append_secondary_free_list(); | |
| 537 | |
| 538 assert(!_free_list.is_empty(), "if the secondary_free_list was not " | |
| 539 "empty we should have moved at least one entry to the free_list"); | |
| 540 HeapRegion* res = _free_list.remove_head(); | |
| 541 if (G1ConcRegionFreeingVerbose) { | |
| 542 gclog_or_tty->print_cr("G1ConcRegionFreeing [region alloc] : " | |
| 543 "allocated "HR_FORMAT" from secondary_free_list", | |
| 544 HR_FORMAT_PARAMS(res)); | |
| 545 } | |
| 546 return res; | |
| 547 } | |
| 548 | |
| 549 // Wait here until we get notifed either when (a) there are no | |
| 550 // more free regions coming or (b) some regions have been moved on | |
| 551 // the secondary_free_list. | |
| 552 SecondaryFreeList_lock->wait(Mutex::_no_safepoint_check_flag); | |
| 553 } | |
| 554 | |
| 555 if (G1ConcRegionFreeingVerbose) { | |
| 556 gclog_or_tty->print_cr("G1ConcRegionFreeing [region alloc] : " | |
| 557 "could not allocate from secondary_free_list"); | |
| 558 } | |
| 559 return NULL; | |
| 560 } | |
| 561 | |
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562 HeapRegion* G1CollectedHeap::new_region(size_t word_size, bool do_expand) { |
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563 assert(!isHumongous(word_size) || word_size <= HeapRegion::GrainWords, |
| 2152 | 564 "the only time we use this to allocate a humongous region is " |
| 565 "when we are allocating a single humongous region"); | |
| 566 | |
| 567 HeapRegion* res; | |
| 568 if (G1StressConcRegionFreeing) { | |
| 569 if (!_secondary_free_list.is_empty()) { | |
| 570 if (G1ConcRegionFreeingVerbose) { | |
| 571 gclog_or_tty->print_cr("G1ConcRegionFreeing [region alloc] : " | |
| 572 "forced to look at the secondary_free_list"); | |
| 573 } | |
| 2361 | 574 res = new_region_try_secondary_free_list(); |
| 2152 | 575 if (res != NULL) { |
| 576 return res; | |
| 577 } | |
| 578 } | |
| 579 } | |
| 580 res = _free_list.remove_head_or_null(); | |
| 581 if (res == NULL) { | |
| 582 if (G1ConcRegionFreeingVerbose) { | |
| 583 gclog_or_tty->print_cr("G1ConcRegionFreeing [region alloc] : " | |
| 584 "res == NULL, trying the secondary_free_list"); | |
| 585 } | |
| 2361 | 586 res = new_region_try_secondary_free_list(); |
| 2152 | 587 } |
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588 if (res == NULL && do_expand && _expand_heap_after_alloc_failure) { |
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589 // Currently, only attempts to allocate GC alloc regions set |
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590 // do_expand to true. So, we should only reach here during a |
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591 // safepoint. If this assumption changes we might have to |
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592 // reconsider the use of _expand_heap_after_alloc_failure. |
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593 assert(SafepointSynchronize::is_at_safepoint(), "invariant"); |
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594 |
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595 ergo_verbose1(ErgoHeapSizing, |
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596 "attempt heap expansion", |
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597 ergo_format_reason("region allocation request failed") |
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598 ergo_format_byte("allocation request"), |
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599 word_size * HeapWordSize); |
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600 if (expand(word_size * HeapWordSize)) { |
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601 // Given that expand() succeeded in expanding the heap, and we |
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602 // always expand the heap by an amount aligned to the heap |
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603 // region size, the free list should in theory not be empty. So |
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604 // it would probably be OK to use remove_head(). But the extra |
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605 // check for NULL is unlikely to be a performance issue here (we |
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606 // just expanded the heap!) so let's just be conservative and |
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607 // use remove_head_or_null(). |
| 3766 | 608 res = _free_list.remove_head_or_null(); |
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609 } else { |
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610 _expand_heap_after_alloc_failure = false; |
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611 } |
| 342 | 612 } |
| 613 return res; | |
| 614 } | |
| 615 | |
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616 uint G1CollectedHeap::humongous_obj_allocate_find_first(uint num_regions, |
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617 size_t word_size) { |
| 2361 | 618 assert(isHumongous(word_size), "word_size should be humongous"); |
| 619 assert(num_regions * HeapRegion::GrainWords >= word_size, "pre-condition"); | |
| 620 | |
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621 uint first = G1_NULL_HRS_INDEX; |
| 2152 | 622 if (num_regions == 1) { |
| 623 // Only one region to allocate, no need to go through the slower | |
| 624 // path. The caller will attempt the expasion if this fails, so | |
| 625 // let's not try to expand here too. | |
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626 HeapRegion* hr = new_region(word_size, false /* do_expand */); |
| 2152 | 627 if (hr != NULL) { |
| 628 first = hr->hrs_index(); | |
| 629 } else { | |
| 3766 | 630 first = G1_NULL_HRS_INDEX; |
| 2152 | 631 } |
| 632 } else { | |
| 633 // We can't allocate humongous regions while cleanupComplete() is | |
| 634 // running, since some of the regions we find to be empty might not | |
| 635 // yet be added to the free list and it is not straightforward to | |
| 636 // know which list they are on so that we can remove them. Note | |
| 637 // that we only need to do this if we need to allocate more than | |
| 638 // one region to satisfy the current humongous allocation | |
| 639 // request. If we are only allocating one region we use the common | |
| 640 // region allocation code (see above). | |
| 641 wait_while_free_regions_coming(); | |
| 2361 | 642 append_secondary_free_list_if_not_empty_with_lock(); |
| 2152 | 643 |
| 644 if (free_regions() >= num_regions) { | |
| 3766 | 645 first = _hrs.find_contiguous(num_regions); |
| 646 if (first != G1_NULL_HRS_INDEX) { | |
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647 for (uint i = first; i < first + num_regions; ++i) { |
| 3766 | 648 HeapRegion* hr = region_at(i); |
| 2152 | 649 assert(hr->is_empty(), "sanity"); |
| 2361 | 650 assert(is_on_master_free_list(hr), "sanity"); |
| 2152 | 651 hr->set_pending_removal(true); |
| 652 } | |
| 653 _free_list.remove_all_pending(num_regions); | |
| 654 } | |
| 655 } | |
| 656 } | |
| 657 return first; | |
| 658 } | |
| 659 | |
| 2361 | 660 HeapWord* |
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661 G1CollectedHeap::humongous_obj_allocate_initialize_regions(uint first, |
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662 uint num_regions, |
| 2361 | 663 size_t word_size) { |
| 3766 | 664 assert(first != G1_NULL_HRS_INDEX, "pre-condition"); |
| 2361 | 665 assert(isHumongous(word_size), "word_size should be humongous"); |
| 666 assert(num_regions * HeapRegion::GrainWords >= word_size, "pre-condition"); | |
| 667 | |
| 668 // Index of last region in the series + 1. | |
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669 uint last = first + num_regions; |
| 2361 | 670 |
| 671 // We need to initialize the region(s) we just discovered. This is | |
| 672 // a bit tricky given that it can happen concurrently with | |
| 673 // refinement threads refining cards on these regions and | |
| 674 // potentially wanting to refine the BOT as they are scanning | |
| 675 // those cards (this can happen shortly after a cleanup; see CR | |
| 676 // 6991377). So we have to set up the region(s) carefully and in | |
| 677 // a specific order. | |
| 678 | |
| 679 // The word size sum of all the regions we will allocate. | |
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680 size_t word_size_sum = (size_t) num_regions * HeapRegion::GrainWords; |
| 2361 | 681 assert(word_size <= word_size_sum, "sanity"); |
| 682 | |
| 683 // This will be the "starts humongous" region. | |
| 3766 | 684 HeapRegion* first_hr = region_at(first); |
| 2361 | 685 // The header of the new object will be placed at the bottom of |
| 686 // the first region. | |
| 687 HeapWord* new_obj = first_hr->bottom(); | |
| 688 // This will be the new end of the first region in the series that | |
| 689 // should also match the end of the last region in the seriers. | |
| 690 HeapWord* new_end = new_obj + word_size_sum; | |
| 691 // This will be the new top of the first region that will reflect | |
| 692 // this allocation. | |
| 693 HeapWord* new_top = new_obj + word_size; | |
| 694 | |
| 695 // First, we need to zero the header of the space that we will be | |
| 696 // allocating. When we update top further down, some refinement | |
| 697 // threads might try to scan the region. By zeroing the header we | |
| 698 // ensure that any thread that will try to scan the region will | |
| 699 // come across the zero klass word and bail out. | |
| 700 // | |
| 701 // NOTE: It would not have been correct to have used | |
| 702 // CollectedHeap::fill_with_object() and make the space look like | |
| 703 // an int array. The thread that is doing the allocation will | |
| 704 // later update the object header to a potentially different array | |
| 705 // type and, for a very short period of time, the klass and length | |
| 706 // fields will be inconsistent. This could cause a refinement | |
| 707 // thread to calculate the object size incorrectly. | |
| 708 Copy::fill_to_words(new_obj, oopDesc::header_size(), 0); | |
| 709 | |
| 710 // We will set up the first region as "starts humongous". This | |
| 711 // will also update the BOT covering all the regions to reflect | |
| 712 // that there is a single object that starts at the bottom of the | |
| 713 // first region. | |
| 714 first_hr->set_startsHumongous(new_top, new_end); | |
| 715 | |
| 716 // Then, if there are any, we will set up the "continues | |
| 717 // humongous" regions. | |
| 718 HeapRegion* hr = NULL; | |
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719 for (uint i = first + 1; i < last; ++i) { |
| 3766 | 720 hr = region_at(i); |
| 2361 | 721 hr->set_continuesHumongous(first_hr); |
| 722 } | |
| 723 // If we have "continues humongous" regions (hr != NULL), then the | |
| 724 // end of the last one should match new_end. | |
| 725 assert(hr == NULL || hr->end() == new_end, "sanity"); | |
| 726 | |
| 727 // Up to this point no concurrent thread would have been able to | |
| 728 // do any scanning on any region in this series. All the top | |
| 729 // fields still point to bottom, so the intersection between | |
| 730 // [bottom,top] and [card_start,card_end] will be empty. Before we | |
| 731 // update the top fields, we'll do a storestore to make sure that | |
| 732 // no thread sees the update to top before the zeroing of the | |
| 733 // object header and the BOT initialization. | |
| 734 OrderAccess::storestore(); | |
| 735 | |
| 736 // Now that the BOT and the object header have been initialized, | |
| 737 // we can update top of the "starts humongous" region. | |
| 738 assert(first_hr->bottom() < new_top && new_top <= first_hr->end(), | |
| 739 "new_top should be in this region"); | |
| 740 first_hr->set_top(new_top); | |
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741 if (_hr_printer.is_active()) { |
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742 HeapWord* bottom = first_hr->bottom(); |
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743 HeapWord* end = first_hr->orig_end(); |
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744 if ((first + 1) == last) { |
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745 // the series has a single humongous region |
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746 _hr_printer.alloc(G1HRPrinter::SingleHumongous, first_hr, new_top); |
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747 } else { |
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748 // the series has more than one humongous regions |
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749 _hr_printer.alloc(G1HRPrinter::StartsHumongous, first_hr, end); |
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750 } |
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751 } |
| 2361 | 752 |
| 753 // Now, we will update the top fields of the "continues humongous" | |
| 754 // regions. The reason we need to do this is that, otherwise, | |
| 755 // these regions would look empty and this will confuse parts of | |
| 756 // G1. For example, the code that looks for a consecutive number | |
| 757 // of empty regions will consider them empty and try to | |
| 758 // re-allocate them. We can extend is_empty() to also include | |
| 759 // !continuesHumongous(), but it is easier to just update the top | |
| 760 // fields here. The way we set top for all regions (i.e., top == | |
| 761 // end for all regions but the last one, top == new_top for the | |
| 762 // last one) is actually used when we will free up the humongous | |
| 763 // region in free_humongous_region(). | |
| 764 hr = NULL; | |
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765 for (uint i = first + 1; i < last; ++i) { |
| 3766 | 766 hr = region_at(i); |
| 2361 | 767 if ((i + 1) == last) { |
| 768 // last continues humongous region | |
| 769 assert(hr->bottom() < new_top && new_top <= hr->end(), | |
| 770 "new_top should fall on this region"); | |
| 771 hr->set_top(new_top); | |
|
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772 _hr_printer.alloc(G1HRPrinter::ContinuesHumongous, hr, new_top); |
| 2361 | 773 } else { |
| 774 // not last one | |
| 775 assert(new_top > hr->end(), "new_top should be above this region"); | |
| 776 hr->set_top(hr->end()); | |
|
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777 _hr_printer.alloc(G1HRPrinter::ContinuesHumongous, hr, hr->end()); |
| 2361 | 778 } |
| 779 } | |
| 780 // If we have continues humongous regions (hr != NULL), then the | |
| 781 // end of the last one should match new_end and its top should | |
| 782 // match new_top. | |
| 783 assert(hr == NULL || | |
| 784 (hr->end() == new_end && hr->top() == new_top), "sanity"); | |
| 785 | |
| 786 assert(first_hr->used() == word_size * HeapWordSize, "invariant"); | |
| 787 _summary_bytes_used += first_hr->used(); | |
| 788 _humongous_set.add(first_hr); | |
| 789 | |
| 790 return new_obj; | |
| 791 } | |
| 792 | |
| 342 | 793 // If could fit into free regions w/o expansion, try. |
| 794 // Otherwise, if can expand, do so. | |
| 795 // Otherwise, if using ex regions might help, try with ex given back. | |
| 1973 | 796 HeapWord* G1CollectedHeap::humongous_obj_allocate(size_t word_size) { |
| 2152 | 797 assert_heap_locked_or_at_safepoint(true /* should_be_vm_thread */); |
| 798 | |
| 799 verify_region_sets_optional(); | |
| 342 | 800 |
|
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801 size_t word_size_rounded = round_to(word_size, HeapRegion::GrainWords); |
|
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802 uint num_regions = (uint) (word_size_rounded / HeapRegion::GrainWords); |
|
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803 uint x_num = expansion_regions(); |
|
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804 uint fs = _hrs.free_suffix(); |
|
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805 uint first = humongous_obj_allocate_find_first(num_regions, word_size); |
| 3766 | 806 if (first == G1_NULL_HRS_INDEX) { |
| 2152 | 807 // The only thing we can do now is attempt expansion. |
|
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808 if (fs + x_num >= num_regions) { |
|
2188
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809 // If the number of regions we're trying to allocate for this |
|
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810 // object is at most the number of regions in the free suffix, |
|
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811 // then the call to humongous_obj_allocate_find_first() above |
|
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812 // should have succeeded and we wouldn't be here. |
|
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813 // |
|
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814 // We should only be trying to expand when the free suffix is |
|
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815 // not sufficient for the object _and_ we have some expansion |
|
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816 // room available. |
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817 assert(num_regions > fs, "earlier allocation should have succeeded"); |
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818 |
|
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819 ergo_verbose1(ErgoHeapSizing, |
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820 "attempt heap expansion", |
|
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821 ergo_format_reason("humongous allocation request failed") |
|
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822 ergo_format_byte("allocation request"), |
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|
823 word_size * HeapWordSize); |
|
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824 if (expand((num_regions - fs) * HeapRegion::GrainBytes)) { |
| 3766 | 825 // Even though the heap was expanded, it might not have |
| 826 // reached the desired size. So, we cannot assume that the | |
| 827 // allocation will succeed. | |
|
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828 first = humongous_obj_allocate_find_first(num_regions, word_size); |
|
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|
829 } |
| 2152 | 830 } |
| 831 } | |
| 832 | |
| 2361 | 833 HeapWord* result = NULL; |
| 3766 | 834 if (first != G1_NULL_HRS_INDEX) { |
| 2361 | 835 result = |
| 836 humongous_obj_allocate_initialize_regions(first, num_regions, word_size); | |
| 837 assert(result != NULL, "it should always return a valid result"); | |
|
3980
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|
838 |
|
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|
839 // A successful humongous object allocation changes the used space |
|
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|
840 // information of the old generation so we need to recalculate the |
|
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|
841 // sizes and update the jstat counters here. |
|
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|
842 g1mm()->update_sizes(); |
| 2152 | 843 } |
| 844 | |
| 845 verify_region_sets_optional(); | |
| 2361 | 846 |
| 847 return result; | |
| 342 | 848 } |
| 849 | |
| 1973 | 850 HeapWord* G1CollectedHeap::allocate_new_tlab(size_t word_size) { |
| 851 assert_heap_not_locked_and_not_at_safepoint(); | |
|
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|
852 assert(!isHumongous(word_size), "we do not allow humongous TLABs"); |
|
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|
853 |
|
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|
854 unsigned int dummy_gc_count_before; |
|
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|
855 return attempt_allocation(word_size, &dummy_gc_count_before); |
| 342 | 856 } |
| 857 | |
| 858 HeapWord* | |
| 859 G1CollectedHeap::mem_allocate(size_t word_size, | |
| 1973 | 860 bool* gc_overhead_limit_was_exceeded) { |
| 861 assert_heap_not_locked_and_not_at_safepoint(); | |
| 342 | 862 |
|
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|
863 // Loop until the allocation is satisified, or unsatisfied after GC. |
| 1973 | 864 for (int try_count = 1; /* we'll return */; try_count += 1) { |
| 865 unsigned int gc_count_before; | |
|
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|
866 |
|
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|
867 HeapWord* result = NULL; |
|
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|
868 if (!isHumongous(word_size)) { |
|
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|
869 result = attempt_allocation(word_size, &gc_count_before); |
|
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|
870 } else { |
|
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|
871 result = attempt_allocation_humongous(word_size, &gc_count_before); |
|
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|
872 } |
|
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|
873 if (result != NULL) { |
|
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|
874 return result; |
| 342 | 875 } |
| 876 | |
| 877 // Create the garbage collection operation... | |
| 1973 | 878 VM_G1CollectForAllocation op(gc_count_before, word_size); |
| 342 | 879 // ...and get the VM thread to execute it. |
| 880 VMThread::execute(&op); | |
| 1973 | 881 |
| 882 if (op.prologue_succeeded() && op.pause_succeeded()) { | |
| 883 // If the operation was successful we'll return the result even | |
| 884 // if it is NULL. If the allocation attempt failed immediately | |
| 885 // after a Full GC, it's unlikely we'll be able to allocate now. | |
| 886 HeapWord* result = op.result(); | |
| 887 if (result != NULL && !isHumongous(word_size)) { | |
| 888 // Allocations that take place on VM operations do not do any | |
| 889 // card dirtying and we have to do it here. We only have to do | |
| 890 // this for non-humongous allocations, though. | |
| 891 dirty_young_block(result, word_size); | |
| 892 } | |
| 342 | 893 return result; |
| 1973 | 894 } else { |
| 895 assert(op.result() == NULL, | |
| 896 "the result should be NULL if the VM op did not succeed"); | |
| 342 | 897 } |
| 898 | |
| 899 // Give a warning if we seem to be looping forever. | |
| 900 if ((QueuedAllocationWarningCount > 0) && | |
| 901 (try_count % QueuedAllocationWarningCount == 0)) { | |
| 1973 | 902 warning("G1CollectedHeap::mem_allocate retries %d times", try_count); |
| 342 | 903 } |
| 904 } | |
| 1973 | 905 |
| 906 ShouldNotReachHere(); | |
|
2433
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|
907 return NULL; |
| 342 | 908 } |
| 909 | |
|
2433
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|
910 HeapWord* G1CollectedHeap::attempt_allocation_slow(size_t word_size, |
|
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|
911 unsigned int *gc_count_before_ret) { |
|
abdfc822206f
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|
912 // Make sure you read the note in attempt_allocation_humongous(). |
|
abdfc822206f
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|
913 |
|
abdfc822206f
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|
914 assert_heap_not_locked_and_not_at_safepoint(); |
|
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|
915 assert(!isHumongous(word_size), "attempt_allocation_slow() should not " |
|
abdfc822206f
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|
916 "be called for humongous allocation requests"); |
|
abdfc822206f
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|
917 |
|
abdfc822206f
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|
918 // We should only get here after the first-level allocation attempt |
|
abdfc822206f
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|
919 // (attempt_allocation()) failed to allocate. |
|
abdfc822206f
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diff
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|
920 |
|
abdfc822206f
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changeset
|
921 // We will loop until a) we manage to successfully perform the |
|
abdfc822206f
7023069: G1: Introduce symmetric locking in the slow allocation path
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|
922 // allocation or b) we successfully schedule a collection which |
|
abdfc822206f
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|
923 // fails to perform the allocation. b) is the only case when we'll |
|
abdfc822206f
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|
924 // return NULL. |
|
abdfc822206f
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|
925 HeapWord* result = NULL; |
|
abdfc822206f
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diff
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|
926 for (int try_count = 1; /* we'll return */; try_count += 1) { |
|
abdfc822206f
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diff
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|
927 bool should_try_gc; |
|
abdfc822206f
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diff
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|
928 unsigned int gc_count_before; |
|
abdfc822206f
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|
929 |
|
abdfc822206f
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|
930 { |
|
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|
931 MutexLockerEx x(Heap_lock); |
|
abdfc822206f
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|
932 |
|
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|
933 result = _mutator_alloc_region.attempt_allocation_locked(word_size, |
|
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|
934 false /* bot_updates */); |
|
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diff
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|
935 if (result != NULL) { |
|
abdfc822206f
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diff
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|
936 return result; |
|
abdfc822206f
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|
937 } |
|
abdfc822206f
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|
938 |
|
abdfc822206f
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|
939 // If we reach here, attempt_allocation_locked() above failed to |
|
abdfc822206f
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|
940 // allocate a new region. So the mutator alloc region should be NULL. |
|
abdfc822206f
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|
941 assert(_mutator_alloc_region.get() == NULL, "only way to get here"); |
|
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|
942 |
|
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|
943 if (GC_locker::is_active_and_needs_gc()) { |
|
abdfc822206f
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|
944 if (g1_policy()->can_expand_young_list()) { |
|
3914
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|
945 // No need for an ergo verbose message here, |
|
20213c8a3c40
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|
946 // can_expand_young_list() does this when it returns true. |
|
2433
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|
947 result = _mutator_alloc_region.attempt_allocation_force(word_size, |
|
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|
948 false /* bot_updates */); |
|
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|
949 if (result != NULL) { |
|
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|
950 return result; |
|
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|
951 } |
|
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|
952 } |
|
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|
953 should_try_gc = false; |
|
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|
954 } else { |
|
6106
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|
955 // The GCLocker may not be active but the GCLocker initiated |
|
1d478c993020
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|
956 // GC may not yet have been performed (GCLocker::needs_gc() |
|
1d478c993020
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|
957 // returns true). In this case we do not try this GC and |
|
1d478c993020
7143858: G1: Back to back young GCs with the second GC having a minimally sized eden
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|
958 // wait until the GCLocker initiated GC is performed, and |
|
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959 // then retry the allocation. |
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960 if (GC_locker::needs_gc()) { |
|
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961 should_try_gc = false; |
|
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962 } else { |
|
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963 // Read the GC count while still holding the Heap_lock. |
|
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964 gc_count_before = total_collections(); |
|
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965 should_try_gc = true; |
|
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966 } |
|
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967 } |
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968 } |
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969 |
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970 if (should_try_gc) { |
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971 bool succeeded; |
|
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972 result = do_collection_pause(word_size, gc_count_before, &succeeded); |
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973 if (result != NULL) { |
|
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974 assert(succeeded, "only way to get back a non-NULL result"); |
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975 return result; |
|
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976 } |
|
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|
977 |
|
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978 if (succeeded) { |
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979 // If we get here we successfully scheduled a collection which |
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980 // failed to allocate. No point in trying to allocate |
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981 // further. We'll just return NULL. |
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982 MutexLockerEx x(Heap_lock); |
|
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983 *gc_count_before_ret = total_collections(); |
|
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984 return NULL; |
|
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|
985 } |
|
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986 } else { |
|
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987 // The GCLocker is either active or the GCLocker initiated |
|
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988 // GC has not yet been performed. Stall until it is and |
|
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989 // then retry the allocation. |
|
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990 GC_locker::stall_until_clear(); |
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991 } |
|
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|
992 |
|
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993 // We can reach here if we were unsuccessul in scheduling a |
|
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994 // collection (because another thread beat us to it) or if we were |
|
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995 // stalled due to the GC locker. In either can we should retry the |
|
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996 // allocation attempt in case another thread successfully |
|
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997 // performed a collection and reclaimed enough space. We do the |
|
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998 // first attempt (without holding the Heap_lock) here and the |
|
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999 // follow-on attempt will be at the start of the next loop |
|
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1000 // iteration (after taking the Heap_lock). |
|
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1001 result = _mutator_alloc_region.attempt_allocation(word_size, |
|
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1002 false /* bot_updates */); |
|
5963
64bf7c8270cb
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1003 if (result != NULL) { |
|
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1004 return result; |
|
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|
1005 } |
|
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1006 |
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1007 // Give a warning if we seem to be looping forever. |
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1008 if ((QueuedAllocationWarningCount > 0) && |
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1009 (try_count % QueuedAllocationWarningCount == 0)) { |
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1010 warning("G1CollectedHeap::attempt_allocation_slow() " |
|
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1011 "retries %d times", try_count); |
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1012 } |
|
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1013 } |
|
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|
1014 |
|
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|
1015 ShouldNotReachHere(); |
|
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|
1016 return NULL; |
|
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|
1017 } |
|
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1018 |
|
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1019 HeapWord* G1CollectedHeap::attempt_allocation_humongous(size_t word_size, |
|
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1020 unsigned int * gc_count_before_ret) { |
|
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1021 // The structure of this method has a lot of similarities to |
|
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1022 // attempt_allocation_slow(). The reason these two were not merged |
|
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1023 // into a single one is that such a method would require several "if |
|
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1024 // allocation is not humongous do this, otherwise do that" |
|
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1025 // conditional paths which would obscure its flow. In fact, an early |
|
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|
1026 // version of this code did use a unified method which was harder to |
|
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1027 // follow and, as a result, it had subtle bugs that were hard to |
|
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|
1028 // track down. So keeping these two methods separate allows each to |
|
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|
1029 // be more readable. It will be good to keep these two in sync as |
|
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|
1030 // much as possible. |
|
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|
1031 |
|
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|
1032 assert_heap_not_locked_and_not_at_safepoint(); |
|
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|
1033 assert(isHumongous(word_size), "attempt_allocation_humongous() " |
|
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|
1034 "should only be called for humongous allocations"); |
|
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|
1035 |
|
4834
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|
1036 // Humongous objects can exhaust the heap quickly, so we should check if we |
|
6a78aa6ac1ff
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|
1037 // need to start a marking cycle at each humongous object allocation. We do |
|
6a78aa6ac1ff
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|
1038 // the check before we do the actual allocation. The reason for doing it |
|
6a78aa6ac1ff
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|
1039 // before the allocation is that we avoid having to keep track of the newly |
|
6a78aa6ac1ff
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|
1040 // allocated memory while we do a GC. |
|
4910
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|
1041 if (g1_policy()->need_to_start_conc_mark("concurrent humongous allocation", |
|
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|
1042 word_size)) { |
|
4834
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|
1043 collect(GCCause::_g1_humongous_allocation); |
|
6a78aa6ac1ff
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|
1044 } |
|
6a78aa6ac1ff
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|
1045 |
|
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|
1046 // We will loop until a) we manage to successfully perform the |
|
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|
1047 // allocation or b) we successfully schedule a collection which |
|
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|
1048 // fails to perform the allocation. b) is the only case when we'll |
|
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|
1049 // return NULL. |
|
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|
1050 HeapWord* result = NULL; |
|
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|
1051 for (int try_count = 1; /* we'll return */; try_count += 1) { |
|
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|
1052 bool should_try_gc; |
|
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|
1053 unsigned int gc_count_before; |
|
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|
1054 |
|
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|
1055 { |
|
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|
1056 MutexLockerEx x(Heap_lock); |
|
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|
1057 |
|
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|
1058 // Given that humongous objects are not allocated in young |
|
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|
1059 // regions, we'll first try to do the allocation without doing a |
|
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|
1060 // collection hoping that there's enough space in the heap. |
|
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|
1061 result = humongous_obj_allocate(word_size); |
|
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|
1062 if (result != NULL) { |
|
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|
1063 return result; |
|
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|
1064 } |
|
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|
1065 |
|
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|
1066 if (GC_locker::is_active_and_needs_gc()) { |
|
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|
1067 should_try_gc = false; |
|
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|
1068 } else { |
|
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|
1069 // The GCLocker may not be active but the GCLocker initiated |
|
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|
1070 // GC may not yet have been performed (GCLocker::needs_gc() |
|
1d478c993020
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|
1071 // returns true). In this case we do not try this GC and |
|
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|
1072 // wait until the GCLocker initiated GC is performed, and |
|
1d478c993020
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|
1073 // then retry the allocation. |
|
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|
1074 if (GC_locker::needs_gc()) { |
|
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|
1075 should_try_gc = false; |
|
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1076 } else { |
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1077 // Read the GC count while still holding the Heap_lock. |
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1078 gc_count_before = total_collections(); |
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1079 should_try_gc = true; |
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1080 } |
|
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1081 } |
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1082 } |
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1083 |
|
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1084 if (should_try_gc) { |
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1085 // If we failed to allocate the humongous object, we should try to |
|
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1086 // do a collection pause (if we're allowed) in case it reclaims |
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1087 // enough space for the allocation to succeed after the pause. |
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1088 |
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1089 bool succeeded; |
|
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1090 result = do_collection_pause(word_size, gc_count_before, &succeeded); |
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1091 if (result != NULL) { |
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1092 assert(succeeded, "only way to get back a non-NULL result"); |
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1093 return result; |
|
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1094 } |
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1095 |
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1096 if (succeeded) { |
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1097 // If we get here we successfully scheduled a collection which |
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1098 // failed to allocate. No point in trying to allocate |
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1099 // further. We'll just return NULL. |
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1100 MutexLockerEx x(Heap_lock); |
|
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1101 *gc_count_before_ret = total_collections(); |
|
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1102 return NULL; |
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1103 } |
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1104 } else { |
|
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1105 // The GCLocker is either active or the GCLocker initiated |
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1106 // GC has not yet been performed. Stall until it is and |
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1107 // then retry the allocation. |
|
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1108 GC_locker::stall_until_clear(); |
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1109 } |
|
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1110 |
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1111 // We can reach here if we were unsuccessul in scheduling a |
|
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1112 // collection (because another thread beat us to it) or if we were |
|
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1113 // stalled due to the GC locker. In either can we should retry the |
|
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1114 // allocation attempt in case another thread successfully |
|
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1115 // performed a collection and reclaimed enough space. Give a |
|
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1116 // warning if we seem to be looping forever. |
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1117 |
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1118 if ((QueuedAllocationWarningCount > 0) && |
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1119 (try_count % QueuedAllocationWarningCount == 0)) { |
|
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1120 warning("G1CollectedHeap::attempt_allocation_humongous() " |
|
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1121 "retries %d times", try_count); |
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1122 } |
|
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1123 } |
|
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1124 |
|
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1125 ShouldNotReachHere(); |
|
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1126 return NULL; |
|
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1127 } |
|
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1128 |
|
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1129 HeapWord* G1CollectedHeap::attempt_allocation_at_safepoint(size_t word_size, |
|
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1130 bool expect_null_mutator_alloc_region) { |
| 2152 | 1131 assert_at_safepoint(true /* should_be_vm_thread */); |
|
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1132 assert(_mutator_alloc_region.get() == NULL || |
|
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1133 !expect_null_mutator_alloc_region, |
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1134 "the current alloc region was unexpectedly found to be non-NULL"); |
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1135 |
|
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1136 if (!isHumongous(word_size)) { |
|
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1137 return _mutator_alloc_region.attempt_allocation_locked(word_size, |
|
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1138 false /* bot_updates */); |
|
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1139 } else { |
|
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1140 HeapWord* result = humongous_obj_allocate(word_size); |
|
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1141 if (result != NULL && g1_policy()->need_to_start_conc_mark("STW humongous allocation")) { |
|
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1142 g1_policy()->set_initiate_conc_mark_if_possible(); |
|
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1143 } |
|
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1144 return result; |
|
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1145 } |
|
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1146 |
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1147 ShouldNotReachHere(); |
| 342 | 1148 } |
| 1149 | |
| 1150 class PostMCRemSetClearClosure: public HeapRegionClosure { | |
| 1151 ModRefBarrierSet* _mr_bs; | |
| 1152 public: | |
| 1153 PostMCRemSetClearClosure(ModRefBarrierSet* mr_bs) : _mr_bs(mr_bs) {} | |
| 1154 bool doHeapRegion(HeapRegion* r) { | |
| 1155 r->reset_gc_time_stamp(); | |
| 1156 if (r->continuesHumongous()) | |
| 1157 return false; | |
| 1158 HeapRegionRemSet* hrrs = r->rem_set(); | |
| 1159 if (hrrs != NULL) hrrs->clear(); | |
| 1160 // You might think here that we could clear just the cards | |
| 1161 // corresponding to the used region. But no: if we leave a dirty card | |
| 1162 // in a region we might allocate into, then it would prevent that card | |
| 1163 // from being enqueued, and cause it to be missed. | |
| 1164 // Re: the performance cost: we shouldn't be doing full GC anyway! | |
| 1165 _mr_bs->clear(MemRegion(r->bottom(), r->end())); | |
| 1166 return false; | |
| 1167 } | |
| 1168 }; | |
| 1169 | |
| 1170 | |
| 1171 class PostMCRemSetInvalidateClosure: public HeapRegionClosure { | |
| 1172 ModRefBarrierSet* _mr_bs; | |
| 1173 public: | |
| 1174 PostMCRemSetInvalidateClosure(ModRefBarrierSet* mr_bs) : _mr_bs(mr_bs) {} | |
| 1175 bool doHeapRegion(HeapRegion* r) { | |
| 1176 if (r->continuesHumongous()) return false; | |
| 1177 if (r->used_region().word_size() != 0) { | |
| 1178 _mr_bs->invalidate(r->used_region(), true /*whole heap*/); | |
| 1179 } | |
| 1180 return false; | |
| 1181 } | |
| 1182 }; | |
| 1183 | |
|
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1184 class RebuildRSOutOfRegionClosure: public HeapRegionClosure { |
|
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1185 G1CollectedHeap* _g1h; |
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1186 UpdateRSOopClosure _cl; |
|
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1187 int _worker_i; |
|
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1188 public: |
|
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1189 RebuildRSOutOfRegionClosure(G1CollectedHeap* g1, int worker_i = 0) : |
| 1861 | 1190 _cl(g1->g1_rem_set(), worker_i), |
|
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1191 _worker_i(worker_i), |
|
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1192 _g1h(g1) |
|
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1193 { } |
|
1960
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1194 |
|
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1195 bool doHeapRegion(HeapRegion* r) { |
|
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1196 if (!r->continuesHumongous()) { |
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1197 _cl.set_from(r); |
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1198 r->oop_iterate(&_cl); |
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1199 } |
|
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1200 return false; |
|
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1201 } |
|
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1202 }; |
|
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1203 |
|
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1204 class ParRebuildRSTask: public AbstractGangTask { |
|
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1205 G1CollectedHeap* _g1; |
|
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1206 public: |
|
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1207 ParRebuildRSTask(G1CollectedHeap* g1) |
|
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1208 : AbstractGangTask("ParRebuildRSTask"), |
|
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1209 _g1(g1) |
|
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1210 { } |
|
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1211 |
|
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1212 void work(uint worker_id) { |
|
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1213 RebuildRSOutOfRegionClosure rebuild_rs(_g1, worker_id); |
|
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1214 _g1->heap_region_par_iterate_chunked(&rebuild_rs, worker_id, |
|
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1215 _g1->workers()->active_workers(), |
|
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1216 HeapRegion::RebuildRSClaimValue); |
|
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1217 } |
|
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1218 }; |
|
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1219 |
|
3778
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1220 class PostCompactionPrinterClosure: public HeapRegionClosure { |
|
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1221 private: |
|
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1222 G1HRPrinter* _hr_printer; |
|
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1223 public: |
|
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|
1224 bool doHeapRegion(HeapRegion* hr) { |
|
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1225 assert(!hr->is_young(), "not expecting to find young regions"); |
|
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1226 // We only generate output for non-empty regions. |
|
5f6f2615433a
7049999: G1: Make the G1PrintHeapRegions output consistent and complete
tonyp
parents:
3777
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changeset
|
1227 if (!hr->is_empty()) { |
|
5f6f2615433a
7049999: G1: Make the G1PrintHeapRegions output consistent and complete
tonyp
parents:
3777
diff
changeset
|
1228 if (!hr->isHumongous()) { |
|
5f6f2615433a
7049999: G1: Make the G1PrintHeapRegions output consistent and complete
tonyp
parents:
3777
diff
changeset
|
1229 _hr_printer->post_compaction(hr, G1HRPrinter::Old); |
|
5f6f2615433a
7049999: G1: Make the G1PrintHeapRegions output consistent and complete
tonyp
parents:
3777
diff
changeset
|
1230 } else if (hr->startsHumongous()) { |
|
3986
65a8ff39a6da
7095194: G1: HeapRegion::GrainBytes, GrainWords, and CardsPerRegion should be size_t
johnc
parents:
3983
diff
changeset
|
1231 if (hr->capacity() == HeapRegion::GrainBytes) { |
|
3778
5f6f2615433a
7049999: G1: Make the G1PrintHeapRegions output consistent and complete
tonyp
parents:
3777
diff
changeset
|
1232 // single humongous region |
|
5f6f2615433a
7049999: G1: Make the G1PrintHeapRegions output consistent and complete
tonyp
parents:
3777
diff
changeset
|
1233 _hr_printer->post_compaction(hr, G1HRPrinter::SingleHumongous); |
|
5f6f2615433a
7049999: G1: Make the G1PrintHeapRegions output consistent and complete
tonyp
parents:
3777
diff
changeset
|
1234 } else { |
|
5f6f2615433a
7049999: G1: Make the G1PrintHeapRegions output consistent and complete
tonyp
parents:
3777
diff
changeset
|
1235 _hr_printer->post_compaction(hr, G1HRPrinter::StartsHumongous); |
|
5f6f2615433a
7049999: G1: Make the G1PrintHeapRegions output consistent and complete
tonyp
parents:
3777
diff
changeset
|
1236 } |
|
5f6f2615433a
7049999: G1: Make the G1PrintHeapRegions output consistent and complete
tonyp
parents:
3777
diff
changeset
|
1237 } else { |
|
5f6f2615433a
7049999: G1: Make the G1PrintHeapRegions output consistent and complete
tonyp
parents:
3777
diff
changeset
|
1238 assert(hr->continuesHumongous(), "only way to get here"); |
|
5f6f2615433a
7049999: G1: Make the G1PrintHeapRegions output consistent and complete
tonyp
parents:
3777
diff
changeset
|
1239 _hr_printer->post_compaction(hr, G1HRPrinter::ContinuesHumongous); |
|
5f6f2615433a
7049999: G1: Make the G1PrintHeapRegions output consistent and complete
tonyp
parents:
3777
diff
changeset
|
1240 } |
|
5f6f2615433a
7049999: G1: Make the G1PrintHeapRegions output consistent and complete
tonyp
parents:
3777
diff
changeset
|
1241 } |
|
5f6f2615433a
7049999: G1: Make the G1PrintHeapRegions output consistent and complete
tonyp
parents:
3777
diff
changeset
|
1242 return false; |
|
5f6f2615433a
7049999: G1: Make the G1PrintHeapRegions output consistent and complete
tonyp
parents:
3777
diff
changeset
|
1243 } |
|
5f6f2615433a
7049999: G1: Make the G1PrintHeapRegions output consistent and complete
tonyp
parents:
3777
diff
changeset
|
1244 |
|
5f6f2615433a
7049999: G1: Make the G1PrintHeapRegions output consistent and complete
tonyp
parents:
3777
diff
changeset
|
1245 PostCompactionPrinterClosure(G1HRPrinter* hr_printer) |
|
5f6f2615433a
7049999: G1: Make the G1PrintHeapRegions output consistent and complete
tonyp
parents:
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diff
changeset
|
1246 : _hr_printer(hr_printer) { } |
|
5f6f2615433a
7049999: G1: Make the G1PrintHeapRegions output consistent and complete
tonyp
parents:
3777
diff
changeset
|
1247 }; |
|
5f6f2615433a
7049999: G1: Make the G1PrintHeapRegions output consistent and complete
tonyp
parents:
3777
diff
changeset
|
1248 |
| 1973 | 1249 bool G1CollectedHeap::do_collection(bool explicit_gc, |
|
1656
4e5661ba9d98
6944166: G1: explicit GCs are not always handled correctly
tonyp
parents:
1611
diff
changeset
|
1250 bool clear_all_soft_refs, |
| 342 | 1251 size_t word_size) { |
| 2152 | 1252 assert_at_safepoint(true /* should_be_vm_thread */); |
| 1253 | |
|
1359
23b1b27ac76c
6909756: G1: guarantee(G1CollectedHeap::heap()->mark_in_progress(),"Precondition.")
tonyp
parents:
1313
diff
changeset
|
1254 if (GC_locker::check_active_before_gc()) { |
| 1973 | 1255 return false; |
|
1359
23b1b27ac76c
6909756: G1: guarantee(G1CollectedHeap::heap()->mark_in_progress(),"Precondition.")
tonyp
parents:
1313
diff
changeset
|
1256 } |
|
23b1b27ac76c
6909756: G1: guarantee(G1CollectedHeap::heap()->mark_in_progress(),"Precondition.")
tonyp
parents:
1313
diff
changeset
|
1257 |
|
2125
7246a374a9f2
6458402: 3 jvmti tests fail with CMS and +ExplicitGCInvokesConcurrent
kamg
parents:
2039
diff
changeset
|
1258 SvcGCMarker sgcm(SvcGCMarker::FULL); |
| 342 | 1259 ResourceMark rm; |
| 1260 | |
|
4872
aa3d708d67c4
7141200: log some interesting information in ring buffers for crashes
never
parents:
4787
diff
changeset
|
1261 print_heap_before_gc(); |
|
838
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
parents:
811
diff
changeset
|
1262 |
| 4072 | 1263 HRSPhaseSetter x(HRSPhaseFullGC); |
| 2152 | 1264 verify_region_sets_optional(); |
| 342 | 1265 |
|
1387
0bfd3fb24150
6858496: Clear all SoftReferences before an out-of-memory due to GC overhead limit.
jmasa
parents:
1360
diff
changeset
|
1266 const bool do_clear_all_soft_refs = clear_all_soft_refs || |
|
0bfd3fb24150
6858496: Clear all SoftReferences before an out-of-memory due to GC overhead limit.
jmasa
parents:
1360
diff
changeset
|
1267 collector_policy()->should_clear_all_soft_refs(); |
|
0bfd3fb24150
6858496: Clear all SoftReferences before an out-of-memory due to GC overhead limit.
jmasa
parents:
1360
diff
changeset
|
1268 |
|
0bfd3fb24150
6858496: Clear all SoftReferences before an out-of-memory due to GC overhead limit.
jmasa
parents:
1360
diff
changeset
|
1269 ClearedAllSoftRefs casr(do_clear_all_soft_refs, collector_policy()); |
|
0bfd3fb24150
6858496: Clear all SoftReferences before an out-of-memory due to GC overhead limit.
jmasa
parents:
1360
diff
changeset
|
1270 |
| 342 | 1271 { |
| 1272 IsGCActiveMark x; | |
| 1273 | |
| 1274 // Timing | |
| 6030 | 1275 assert(gc_cause() != GCCause::_java_lang_system_gc || explicit_gc, "invariant"); |
|
6007
5c86f8211d1e
7160728: Introduce an extra logging level for G1 logging
brutisso
parents:
5987
diff
changeset
|
1276 gclog_or_tty->date_stamp(G1Log::fine() && PrintGCDateStamps); |
|
5c86f8211d1e
7160728: Introduce an extra logging level for G1 logging
brutisso
parents:
5987
diff
changeset
|
1277 TraceCPUTime tcpu(G1Log::finer(), true, gclog_or_tty); |
| 6030 | 1278 |
|
6064
9d679effd28c
7166894: Add gc cause to GC logging for all collectors
brutisso
parents:
6059
diff
changeset
|
1279 TraceTime t(GCCauseString("Full GC", gc_cause()), G1Log::fine(), true, gclog_or_tty); |
|
3289
b52782ae3880
6946417: G1: Java VisualVM does not support G1 properly.
jmasa
parents:
3285
diff
changeset
|
1280 TraceCollectorStats tcs(g1mm()->full_collection_counters()); |
|
3356
78542e2b5e35
7036199: Adding a notification to the implementation of GarbageCollectorMXBeans
fparain
parents:
3323
diff
changeset
|
1281 TraceMemoryManagerStats tms(true /* fullGC */, gc_cause()); |
|
1089
db0d5eba9d20
6815790: G1: Missing MemoryPoolMXBeans with -XX:+UseG1GC
tonyp
parents:
1088
diff
changeset
|
1282 |
| 342 | 1283 double start = os::elapsedTime(); |
| 1284 g1_policy()->record_full_collection_start(); | |
| 1285 | |
|
4837
eff609af17d7
7127706: G1: re-enable survivors during the initial-mark pause
tonyp
parents:
4836
diff
changeset
|
1286 // Note: When we have a more flexible GC logging framework that |
|
eff609af17d7
7127706: G1: re-enable survivors during the initial-mark pause
tonyp
parents:
4836
diff
changeset
|
1287 // allows us to add optional attributes to a GC log record we |
|
eff609af17d7
7127706: G1: re-enable survivors during the initial-mark pause
tonyp
parents:
4836
diff
changeset
|
1288 // could consider timing and reporting how long we wait in the |
|
eff609af17d7
7127706: G1: re-enable survivors during the initial-mark pause
tonyp
parents:
4836
diff
changeset
|
1289 // following two methods. |
| 2152 | 1290 wait_while_free_regions_coming(); |
|
4837
eff609af17d7
7127706: G1: re-enable survivors during the initial-mark pause
tonyp
parents:
4836
diff
changeset
|
1291 // If we start the compaction before the CM threads finish |
|
eff609af17d7
7127706: G1: re-enable survivors during the initial-mark pause
tonyp
parents:
4836
diff
changeset
|
1292 // scanning the root regions we might trip them over as we'll |
|
eff609af17d7
7127706: G1: re-enable survivors during the initial-mark pause
tonyp
parents:
4836
diff
changeset
|
1293 // be moving objects / updating references. So let's wait until |
|
eff609af17d7
7127706: G1: re-enable survivors during the initial-mark pause
tonyp
parents:
4836
diff
changeset
|
1294 // they are done. By telling them to abort, they should complete |
|
eff609af17d7
7127706: G1: re-enable survivors during the initial-mark pause
tonyp
parents:
4836
diff
changeset
|
1295 // early. |
|
eff609af17d7
7127706: G1: re-enable survivors during the initial-mark pause
tonyp
parents:
4836
diff
changeset
|
1296 _cm->root_regions()->abort(); |
|
eff609af17d7
7127706: G1: re-enable survivors during the initial-mark pause
tonyp
parents:
4836
diff
changeset
|
1297 _cm->root_regions()->wait_until_scan_finished(); |
| 2361 | 1298 append_secondary_free_list_if_not_empty_with_lock(); |
| 2152 | 1299 |
| 342 | 1300 gc_prologue(true); |
|
838
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
parents:
811
diff
changeset
|
1301 increment_total_collections(true /* full gc */); |
|
6120
37552638d24a
7172388: G1: _total_full_collections should not be incremented for concurrent cycles
brutisso
parents:
6109
diff
changeset
|
1302 increment_old_marking_cycles_started(); |
| 342 | 1303 |
| 1304 size_t g1h_prev_used = used(); | |
| 1305 assert(used() == recalculate_used(), "Should be equal"); | |
| 1306 | |
| 1307 if (VerifyBeforeGC && total_collections() >= VerifyGCStartAt) { | |
| 1308 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
|
1309 gclog_or_tty->print(" VerifyBeforeGC:"); |
| 342 | 1310 prepare_for_verify(); |
| 6008 | 1311 Universe::verify(/* silent */ false, |
|
3772
6747fd0512e0
7004681: G1: Extend marking verification to Full GCs
johnc
parents:
3766
diff
changeset
|
1312 /* option */ VerifyOption_G1UsePrevMarking); |
|
6747fd0512e0
7004681: G1: Extend marking verification to Full GCs
johnc
parents:
3766
diff
changeset
|
1313 |
| 342 | 1314 } |
|
3869
7f776886a215
6810861: G1: support -XX:+{PrintClassHistogram,HeapDump}{Before,After}FullGC
ysr
parents:
3867
diff
changeset
|
1315 pre_full_gc_dump(); |
| 342 | 1316 |
| 1317 COMPILER2_PRESENT(DerivedPointerTable::clear()); | |
| 1318 | |
|
3979
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
1319 // Disable discovery and empty the discovered lists |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
1320 // for the CM ref processor. |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
1321 ref_processor_cm()->disable_discovery(); |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
1322 ref_processor_cm()->abandon_partial_discovery(); |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
1323 ref_processor_cm()->verify_no_references_recorded(); |
| 342 | 1324 |
| 1325 // Abandon current iterations of concurrent marking and concurrent | |
|
4837
eff609af17d7
7127706: G1: re-enable survivors during the initial-mark pause
tonyp
parents:
4836
diff
changeset
|
1326 // refinement, if any are in progress. We have to do this before |
|
eff609af17d7
7127706: G1: re-enable survivors during the initial-mark pause
tonyp
parents:
4836
diff
changeset
|
1327 // wait_until_scan_finished() below. |
| 342 | 1328 concurrent_mark()->abort(); |
| 1329 | |
| 1330 // Make sure we'll choose a new allocation region afterwards. | |
|
2433
abdfc822206f
7023069: G1: Introduce symmetric locking in the slow allocation path
tonyp
parents:
2432
diff
changeset
|
1331 release_mutator_alloc_region(); |
| 636 | 1332 abandon_gc_alloc_regions(); |
| 1861 | 1333 g1_rem_set()->cleanupHRRS(); |
|
1394
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
1334 |
|
3778
5f6f2615433a
7049999: G1: Make the G1PrintHeapRegions output consistent and complete
tonyp
parents:
3777
diff
changeset
|
1335 // We should call this after we retire any currently active alloc |
|
5f6f2615433a
7049999: G1: Make the G1PrintHeapRegions output consistent and complete
tonyp
parents:
3777
diff
changeset
|
1336 // regions so that all the ALLOC / RETIRE events are generated |
|
5f6f2615433a
7049999: G1: Make the G1PrintHeapRegions output consistent and complete
tonyp
parents:
3777
diff
changeset
|
1337 // before the start GC event. |
|
5f6f2615433a
7049999: G1: Make the G1PrintHeapRegions output consistent and complete
tonyp
parents:
3777
diff
changeset
|
1338 _hr_printer.start_gc(true /* full */, (size_t) total_collections()); |
|
5f6f2615433a
7049999: G1: Make the G1PrintHeapRegions output consistent and complete
tonyp
parents:
3777
diff
changeset
|
1339 |
|
1394
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
1340 // We may have added regions to the current incremental collection |
|
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
1341 // set between the last GC or pause and now. We need to clear the |
|
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
1342 // incremental collection set and then start rebuilding it afresh |
|
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
1343 // after this full GC. |
|
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
1344 abandon_collection_set(g1_policy()->inc_cset_head()); |
|
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
1345 g1_policy()->clear_incremental_cset(); |
|
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
1346 g1_policy()->stop_incremental_cset_building(); |
|
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
1347 |
| 4072 | 1348 tear_down_region_sets(false /* free_list_only */); |
| 4710 | 1349 g1_policy()->set_gcs_are_young(true); |
| 342 | 1350 |
|
3979
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
1351 // See the comments in g1CollectedHeap.hpp and |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
1352 // G1CollectedHeap::ref_processing_init() about |
|
1974
fd1d227ef1b9
6983204: G1: Nightly test nsk/regression/b4958615 failing with +ExplicitGCInvokesConcurrent
johnc
parents:
1973
diff
changeset
|
1353 // how reference processing currently works in G1. |
|
fd1d227ef1b9
6983204: G1: Nightly test nsk/regression/b4958615 failing with +ExplicitGCInvokesConcurrent
johnc
parents:
1973
diff
changeset
|
1354 |
|
3979
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
1355 // Temporarily make discovery by the STW ref processor single threaded (non-MT). |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
1356 ReferenceProcessorMTDiscoveryMutator stw_rp_disc_ser(ref_processor_stw(), false); |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
1357 |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
1358 // Temporarily clear the STW ref processor's _is_alive_non_header field. |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
1359 ReferenceProcessorIsAliveMutator stw_rp_is_alive_null(ref_processor_stw(), NULL); |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
1360 |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
1361 ref_processor_stw()->enable_discovery(true /*verify_disabled*/, true /*verify_no_refs*/); |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
1362 ref_processor_stw()->setup_policy(do_clear_all_soft_refs); |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
1363 |
| 342 | 1364 // Do collection work |
| 1365 { | |
| 1366 HandleMark hm; // Discard invalid handles created during gc | |
|
3979
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
1367 G1MarkSweep::invoke_at_safepoint(ref_processor_stw(), do_clear_all_soft_refs); |
| 342 | 1368 } |
|
3979
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
1369 |
| 2152 | 1370 assert(free_regions() == 0, "we should not have added any free regions"); |
| 4072 | 1371 rebuild_region_sets(false /* free_list_only */); |
| 342 | 1372 |
|
3979
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
1373 // Enqueue any discovered reference objects that have |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
1374 // not been removed from the discovered lists. |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
1375 ref_processor_stw()->enqueue_discovered_references(); |
| 342 | 1376 |
| 1377 COMPILER2_PRESENT(DerivedPointerTable::update_pointers()); | |
| 1378 | |
|
1089
db0d5eba9d20
6815790: G1: Missing MemoryPoolMXBeans with -XX:+UseG1GC
tonyp
parents:
1088
diff
changeset
|
1379 MemoryService::track_memory_usage(); |
|
db0d5eba9d20
6815790: G1: Missing MemoryPoolMXBeans with -XX:+UseG1GC
tonyp
parents:
1088
diff
changeset
|
1380 |
| 342 | 1381 if (VerifyAfterGC && total_collections() >= VerifyGCStartAt) { |
| 1382 HandleMark hm; // Discard invalid handles created during verification | |
| 1383 gclog_or_tty->print(" VerifyAfterGC:"); | |
|
637
25e146966e7c
6817419: G1: Enable extensive verification for humongous regions
iveresov
parents:
636
diff
changeset
|
1384 prepare_for_verify(); |
| 6008 | 1385 Universe::verify(/* silent */ false, |
|
3772
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7004681: G1: Extend marking verification to Full GCs
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1386 /* option */ VerifyOption_G1UsePrevMarking); |
|
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1387 |
| 342 | 1388 } |
|
3979
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|
1389 |
|
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|
1390 assert(!ref_processor_stw()->discovery_enabled(), "Postcondition"); |
|
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|
1391 ref_processor_stw()->verify_no_references_recorded(); |
|
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|
1392 |
|
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|
1393 // Note: since we've just done a full GC, concurrent |
|
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|
1394 // marking is no longer active. Therefore we need not |
|
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|
1395 // re-enable reference discovery for the CM ref processor. |
|
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|
1396 // That will be done at the start of the next marking cycle. |
|
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|
1397 assert(!ref_processor_cm()->discovery_enabled(), "Postcondition"); |
|
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|
1398 ref_processor_cm()->verify_no_references_recorded(); |
| 342 | 1399 |
| 1400 reset_gc_time_stamp(); | |
| 1401 // Since everything potentially moved, we will clear all remembered | |
|
626
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1402 // sets, and clear all cards. Later we will rebuild remebered |
|
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1403 // sets. We will also reset the GC time stamps of the regions. |
| 342 | 1404 PostMCRemSetClearClosure rs_clear(mr_bs()); |
| 1405 heap_region_iterate(&rs_clear); | |
| 1406 | |
| 1407 // Resize the heap if necessary. | |
|
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|
1408 resize_if_necessary_after_full_collection(explicit_gc ? 0 : word_size); |
| 342 | 1409 |
|
3778
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|
1410 if (_hr_printer.is_active()) { |
|
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|
1411 // We should do this after we potentially resize the heap so |
|
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|
1412 // that all the COMMIT / UNCOMMIT events are generated before |
|
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1413 // the end GC event. |
|
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|
1414 |
|
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|
1415 PostCompactionPrinterClosure cl(hr_printer()); |
|
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|
1416 heap_region_iterate(&cl); |
|
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|
1417 |
|
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|
1418 _hr_printer.end_gc(true /* full */, (size_t) total_collections()); |
|
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|
1419 } |
|
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|
1420 |
| 342 | 1421 if (_cg1r->use_cache()) { |
| 1422 _cg1r->clear_and_record_card_counts(); | |
| 1423 _cg1r->clear_hot_cache(); | |
| 1424 } | |
| 1425 | |
|
626
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1426 // Rebuild remembered sets of all regions. |
|
1833
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|
1427 if (G1CollectedHeap::use_parallel_gc_threads()) { |
|
4728
441e946dc1af
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|
1428 uint n_workers = |
|
4095
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|
1429 AdaptiveSizePolicy::calc_active_workers(workers()->total_workers(), |
|
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|
1430 workers()->active_workers(), |
|
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|
1431 Threads::number_of_non_daemon_threads()); |
|
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|
1432 assert(UseDynamicNumberOfGCThreads || |
|
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|
1433 n_workers == workers()->total_workers(), |
|
bca17e38de00
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|
1434 "If not dynamic should be using all the workers"); |
|
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|
1435 workers()->set_active_workers(n_workers); |
|
bca17e38de00
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|
1436 // Set parallel threads in the heap (_n_par_threads) only |
|
bca17e38de00
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1437 // before a parallel phase and always reset it to 0 after |
|
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|
1438 // the phase so that the number of parallel threads does |
|
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|
1439 // no get carried forward to a serial phase where there |
|
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|
1440 // may be code that is "possibly_parallel". |
|
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|
1441 set_par_threads(n_workers); |
|
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|
1442 |
|
626
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|
1443 ParRebuildRSTask rebuild_rs_task(this); |
|
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1444 assert(check_heap_region_claim_values( |
|
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|
1445 HeapRegion::InitialClaimValue), "sanity check"); |
|
4095
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|
1446 assert(UseDynamicNumberOfGCThreads || |
|
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|
1447 workers()->active_workers() == workers()->total_workers(), |
|
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|
1448 "Unless dynamic should use total workers"); |
|
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|
1449 // Use the most recent number of active workers |
|
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|
1450 assert(workers()->active_workers() > 0, |
|
bca17e38de00
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|
1451 "Active workers not properly set"); |
|
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|
1452 set_par_threads(workers()->active_workers()); |
|
626
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|
1453 workers()->run_task(&rebuild_rs_task); |
|
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6760309: G1: update remembered sets during Full GCs
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|
1454 set_par_threads(0); |
|
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|
1455 assert(check_heap_region_claim_values( |
|
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|
1456 HeapRegion::RebuildRSClaimValue), "sanity check"); |
|
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|
1457 reset_heap_region_claim_values(); |
|
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|
1458 } else { |
|
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|
1459 RebuildRSOutOfRegionClosure rebuild_rs(this); |
|
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|
1460 heap_region_iterate(&rebuild_rs); |
|
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|
1461 } |
|
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|
1462 |
|
6007
5c86f8211d1e
7160728: Introduce an extra logging level for G1 logging
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|
1463 if (G1Log::fine()) { |
| 342 | 1464 print_size_transition(gclog_or_tty, g1h_prev_used, used(), capacity()); |
| 1465 } | |
| 1466 | |
| 1467 if (true) { // FIXME | |
| 1468 // Ask the permanent generation to adjust size for full collections | |
| 1469 perm()->compute_new_size(); | |
| 1470 } | |
| 1471 | |
|
1394
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
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|
1472 // Start a new incremental collection set for the next pause |
|
1316cec51b4d
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diff
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|
1473 assert(g1_policy()->collection_set() == NULL, "must be"); |
|
1316cec51b4d
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|
1474 g1_policy()->start_incremental_cset_building(); |
|
1316cec51b4d
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|
1475 |
|
1316cec51b4d
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diff
changeset
|
1476 // Clear the _cset_fast_test bitmap in anticipation of adding |
|
1316cec51b4d
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|
1477 // regions to the incremental collection set for the next |
|
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|
1478 // evacuation pause. |
|
1316cec51b4d
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|
1479 clear_cset_fast_test(); |
|
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diff
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|
1480 |
|
2433
abdfc822206f
7023069: G1: Introduce symmetric locking in the slow allocation path
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diff
changeset
|
1481 init_mutator_alloc_region(); |
|
abdfc822206f
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diff
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|
1482 |
| 342 | 1483 double end = os::elapsedTime(); |
| 1484 g1_policy()->record_full_collection_end(); | |
| 1485 | |
|
546
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6690928: Use spinning in combination with yields for workstealing termination.
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diff
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|
1486 #ifdef TRACESPINNING |
|
05c6d52fa7a9
6690928: Use spinning in combination with yields for workstealing termination.
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diff
changeset
|
1487 ParallelTaskTerminator::print_termination_counts(); |
|
05c6d52fa7a9
6690928: Use spinning in combination with yields for workstealing termination.
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545
diff
changeset
|
1488 #endif |
|
05c6d52fa7a9
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diff
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|
1489 |
| 342 | 1490 gc_epilogue(true); |
| 1491 | |
| 794 | 1492 // Discard all rset updates |
| 1493 JavaThread::dirty_card_queue_set().abandon_logs(); | |
|
616
4f360ec815ba
6720309: G1: don't synchronously update RSet during evacuation pauses
iveresov
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diff
changeset
|
1494 assert(!G1DeferredRSUpdate |
|
4f360ec815ba
6720309: G1: don't synchronously update RSet during evacuation pauses
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diff
changeset
|
1495 || (G1DeferredRSUpdate && (dirty_card_queue_set().completed_buffers_num() == 0)), "Should not be any"); |
| 342 | 1496 } |
| 1497 | |
|
3867
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|
1498 _young_list->reset_sampled_info(); |
|
ff53346271fe
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|
1499 // At this point there should be no regions in the |
|
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|
1500 // entire heap tagged as young. |
|
ff53346271fe
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|
1501 assert( check_young_list_empty(true /* check_heap */), |
|
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diff
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|
1502 "young list should be empty at this point"); |
|
838
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
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diff
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|
1503 |
|
1656
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|
1504 // Update the number of full collections that have been completed. |
|
6120
37552638d24a
7172388: G1: _total_full_collections should not be incremented for concurrent cycles
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diff
changeset
|
1505 increment_old_marking_cycles_completed(false /* concurrent */); |
|
1656
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|
1506 |
| 3766 | 1507 _hrs.verify_optional(); |
| 2152 | 1508 verify_region_sets_optional(); |
| 1509 | |
|
4872
aa3d708d67c4
7141200: log some interesting information in ring buffers for crashes
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|
1510 print_heap_after_gc(); |
|
3980
8229bd737950
7075646: G1: fix inconsistencies in the monitoring data
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|
1511 g1mm()->update_sizes(); |
|
3869
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6810861: G1: support -XX:+{PrintClassHistogram,HeapDump}{Before,After}FullGC
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diff
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|
1512 post_full_gc_dump(); |
| 1973 | 1513 |
| 1514 return true; | |
| 342 | 1515 } |
| 1516 | |
| 1517 void G1CollectedHeap::do_full_collection(bool clear_all_soft_refs) { | |
| 1973 | 1518 // do_collection() will return whether it succeeded in performing |
| 1519 // the GC. Currently, there is no facility on the | |
| 1520 // do_full_collection() API to notify the caller than the collection | |
| 1521 // did not succeed (e.g., because it was locked out by the GC | |
| 1522 // locker). So, right now, we'll ignore the return value. | |
| 1523 bool dummy = do_collection(true, /* explicit_gc */ | |
| 1524 clear_all_soft_refs, | |
| 1525 0 /* word_size */); | |
| 342 | 1526 } |
| 1527 | |
| 1528 // This code is mostly copied from TenuredGeneration. | |
| 1529 void | |
| 1530 G1CollectedHeap:: | |
| 1531 resize_if_necessary_after_full_collection(size_t word_size) { | |
| 1532 assert(MinHeapFreeRatio <= MaxHeapFreeRatio, "sanity check"); | |
| 1533 | |
| 1534 // Include the current allocation, if any, and bytes that will be | |
| 1535 // pre-allocated to support collections, as "used". | |
| 1536 const size_t used_after_gc = used(); | |
| 1537 const size_t capacity_after_gc = capacity(); | |
| 1538 const size_t free_after_gc = capacity_after_gc - used_after_gc; | |
| 1539 | |
|
1717
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|
1540 // This is enforced in arguments.cpp. |
|
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|
1541 assert(MinHeapFreeRatio <= MaxHeapFreeRatio, |
|
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|
1542 "otherwise the code below doesn't make sense"); |
|
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|
1543 |
| 342 | 1544 // We don't have floating point command-line arguments |
|
1717
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|
1545 const double minimum_free_percentage = (double) MinHeapFreeRatio / 100.0; |
| 342 | 1546 const double maximum_used_percentage = 1.0 - minimum_free_percentage; |
|
1717
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|
1547 const double maximum_free_percentage = (double) MaxHeapFreeRatio / 100.0; |
| 342 | 1548 const double minimum_used_percentage = 1.0 - maximum_free_percentage; |
| 1549 | |
|
1717
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|
1550 const size_t min_heap_size = collector_policy()->min_heap_byte_size(); |
|
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1551 const size_t max_heap_size = collector_policy()->max_heap_byte_size(); |
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1552 |
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1553 // We have to be careful here as these two calculations can overflow |
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1554 // 32-bit size_t's. |
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1555 double used_after_gc_d = (double) used_after_gc; |
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1556 double minimum_desired_capacity_d = used_after_gc_d / maximum_used_percentage; |
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1557 double maximum_desired_capacity_d = used_after_gc_d / minimum_used_percentage; |
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1558 |
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1559 // Let's make sure that they are both under the max heap size, which |
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1560 // by default will make them fit into a size_t. |
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1561 double desired_capacity_upper_bound = (double) max_heap_size; |
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1562 minimum_desired_capacity_d = MIN2(minimum_desired_capacity_d, |
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1563 desired_capacity_upper_bound); |
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1564 maximum_desired_capacity_d = MIN2(maximum_desired_capacity_d, |
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1565 desired_capacity_upper_bound); |
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1566 |
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1567 // We can now safely turn them into size_t's. |
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1568 size_t minimum_desired_capacity = (size_t) minimum_desired_capacity_d; |
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1569 size_t maximum_desired_capacity = (size_t) maximum_desired_capacity_d; |
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1570 |
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1571 // This assert only makes sense here, before we adjust them |
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1572 // with respect to the min and max heap size. |
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1573 assert(minimum_desired_capacity <= maximum_desired_capacity, |
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1574 err_msg("minimum_desired_capacity = "SIZE_FORMAT", " |
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1575 "maximum_desired_capacity = "SIZE_FORMAT, |
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1576 minimum_desired_capacity, maximum_desired_capacity)); |
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1577 |
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1578 // Should not be greater than the heap max size. No need to adjust |
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1579 // it with respect to the heap min size as it's a lower bound (i.e., |
|
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1580 // we'll try to make the capacity larger than it, not smaller). |
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1581 minimum_desired_capacity = MIN2(minimum_desired_capacity, max_heap_size); |
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1582 // Should not be less than the heap min size. No need to adjust it |
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1583 // with respect to the heap max size as it's an upper bound (i.e., |
|
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1584 // we'll try to make the capacity smaller than it, not greater). |
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1585 maximum_desired_capacity = MAX2(maximum_desired_capacity, min_heap_size); |
| 342 | 1586 |
|
1717
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1587 if (capacity_after_gc < minimum_desired_capacity) { |
| 342 | 1588 // Don't expand unless it's significant |
| 1589 size_t expand_bytes = minimum_desired_capacity - capacity_after_gc; | |
|
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1590 ergo_verbose4(ErgoHeapSizing, |
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1591 "attempt heap expansion", |
|
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1592 ergo_format_reason("capacity lower than " |
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1593 "min desired capacity after Full GC") |
|
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1594 ergo_format_byte("capacity") |
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1595 ergo_format_byte("occupancy") |
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1596 ergo_format_byte_perc("min desired capacity"), |
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1597 capacity_after_gc, used_after_gc, |
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1598 minimum_desired_capacity, (double) MinHeapFreeRatio); |
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1599 expand(expand_bytes); |
| 342 | 1600 |
| 1601 // No expansion, now see if we want to shrink | |
|
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1602 } else if (capacity_after_gc > maximum_desired_capacity) { |
| 342 | 1603 // Capacity too large, compute shrinking size |
| 1604 size_t shrink_bytes = capacity_after_gc - maximum_desired_capacity; | |
|
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1605 ergo_verbose4(ErgoHeapSizing, |
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1606 "attempt heap shrinking", |
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1607 ergo_format_reason("capacity higher than " |
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1608 "max desired capacity after Full GC") |
|
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1609 ergo_format_byte("capacity") |
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1610 ergo_format_byte("occupancy") |
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1611 ergo_format_byte_perc("max desired capacity"), |
|
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1612 capacity_after_gc, used_after_gc, |
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|
1613 maximum_desired_capacity, (double) MaxHeapFreeRatio); |
| 342 | 1614 shrink(shrink_bytes); |
| 1615 } | |
| 1616 } | |
| 1617 | |
| 1618 | |
| 1619 HeapWord* | |
| 1973 | 1620 G1CollectedHeap::satisfy_failed_allocation(size_t word_size, |
| 1621 bool* succeeded) { | |
| 2152 | 1622 assert_at_safepoint(true /* should_be_vm_thread */); |
| 1973 | 1623 |
| 1624 *succeeded = true; | |
| 1625 // Let's attempt the allocation first. | |
|
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1626 HeapWord* result = |
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1627 attempt_allocation_at_safepoint(word_size, |
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|
1628 false /* expect_null_mutator_alloc_region */); |
| 1973 | 1629 if (result != NULL) { |
| 1630 assert(*succeeded, "sanity"); | |
| 1631 return result; | |
| 1632 } | |
| 342 | 1633 |
| 1634 // In a G1 heap, we're supposed to keep allocation from failing by | |
| 1635 // incremental pauses. Therefore, at least for now, we'll favor | |
| 1636 // expansion over collection. (This might change in the future if we can | |
| 1637 // do something smarter than full collection to satisfy a failed alloc.) | |
| 1638 result = expand_and_allocate(word_size); | |
| 1639 if (result != NULL) { | |
| 1973 | 1640 assert(*succeeded, "sanity"); |
| 342 | 1641 return result; |
| 1642 } | |
| 1643 | |
| 1973 | 1644 // Expansion didn't work, we'll try to do a Full GC. |
| 1645 bool gc_succeeded = do_collection(false, /* explicit_gc */ | |
| 1646 false, /* clear_all_soft_refs */ | |
| 1647 word_size); | |
| 1648 if (!gc_succeeded) { | |
| 1649 *succeeded = false; | |
| 1650 return NULL; | |
| 1651 } | |
| 1652 | |
| 1653 // Retry the allocation | |
| 1654 result = attempt_allocation_at_safepoint(word_size, | |
|
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|
1655 true /* expect_null_mutator_alloc_region */); |
| 342 | 1656 if (result != NULL) { |
| 1973 | 1657 assert(*succeeded, "sanity"); |
| 342 | 1658 return result; |
| 1659 } | |
| 1660 | |
| 1973 | 1661 // Then, try a Full GC that will collect all soft references. |
| 1662 gc_succeeded = do_collection(false, /* explicit_gc */ | |
| 1663 true, /* clear_all_soft_refs */ | |
| 1664 word_size); | |
| 1665 if (!gc_succeeded) { | |
| 1666 *succeeded = false; | |
| 1667 return NULL; | |
| 1668 } | |
| 1669 | |
| 1670 // Retry the allocation once more | |
| 1671 result = attempt_allocation_at_safepoint(word_size, | |
|
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|
1672 true /* expect_null_mutator_alloc_region */); |
| 342 | 1673 if (result != NULL) { |
| 1973 | 1674 assert(*succeeded, "sanity"); |
| 342 | 1675 return result; |
| 1676 } | |
| 1677 | |
|
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|
1678 assert(!collector_policy()->should_clear_all_soft_refs(), |
| 1973 | 1679 "Flag should have been handled and cleared prior to this point"); |
|
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|
1680 |
| 342 | 1681 // What else? We might try synchronous finalization later. If the total |
| 1682 // space available is large enough for the allocation, then a more | |
| 1683 // complete compaction phase than we've tried so far might be | |
| 1684 // appropriate. | |
| 1973 | 1685 assert(*succeeded, "sanity"); |
| 342 | 1686 return NULL; |
| 1687 } | |
| 1688 | |
| 1689 // Attempting to expand the heap sufficiently | |
| 1690 // to support an allocation of the given "word_size". If | |
| 1691 // successful, perform the allocation and return the address of the | |
| 1692 // allocated block, or else "NULL". | |
| 1693 | |
| 1694 HeapWord* G1CollectedHeap::expand_and_allocate(size_t word_size) { | |
| 2152 | 1695 assert_at_safepoint(true /* should_be_vm_thread */); |
| 1696 | |
| 1697 verify_region_sets_optional(); | |
| 1973 | 1698 |
|
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|
1699 size_t expand_bytes = MAX2(word_size * HeapWordSize, MinHeapDeltaBytes); |
|
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1700 ergo_verbose1(ErgoHeapSizing, |
|
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1701 "attempt heap expansion", |
|
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|
1702 ergo_format_reason("allocation request failed") |
|
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|
1703 ergo_format_byte("allocation request"), |
|
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1704 word_size * HeapWordSize); |
|
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1705 if (expand(expand_bytes)) { |
| 3766 | 1706 _hrs.verify_optional(); |
|
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1707 verify_region_sets_optional(); |
|
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1708 return attempt_allocation_at_safepoint(word_size, |
|
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1709 false /* expect_null_mutator_alloc_region */); |
|
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1710 } |
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1711 return NULL; |
| 342 | 1712 } |
| 1713 | |
| 3766 | 1714 void G1CollectedHeap::update_committed_space(HeapWord* old_end, |
| 1715 HeapWord* new_end) { | |
| 1716 assert(old_end != new_end, "don't call this otherwise"); | |
| 1717 assert((HeapWord*) _g1_storage.high() == new_end, "invariant"); | |
| 1718 | |
| 1719 // Update the committed mem region. | |
| 1720 _g1_committed.set_end(new_end); | |
| 1721 // Tell the card table about the update. | |
| 1722 Universe::heap()->barrier_set()->resize_covered_region(_g1_committed); | |
| 1723 // Tell the BOT about the update. | |
| 1724 _bot_shared->resize(_g1_committed.word_size()); | |
| 1725 } | |
| 1726 | |
|
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1727 bool G1CollectedHeap::expand(size_t expand_bytes) { |
| 342 | 1728 size_t old_mem_size = _g1_storage.committed_size(); |
|
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|
1729 size_t aligned_expand_bytes = ReservedSpace::page_align_size_up(expand_bytes); |
| 342 | 1730 aligned_expand_bytes = align_size_up(aligned_expand_bytes, |
| 1731 HeapRegion::GrainBytes); | |
|
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1732 ergo_verbose2(ErgoHeapSizing, |
|
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1733 "expand the heap", |
|
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1734 ergo_format_byte("requested expansion amount") |
|
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|
1735 ergo_format_byte("attempted expansion amount"), |
|
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1736 expand_bytes, aligned_expand_bytes); |
|
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1737 |
| 3766 | 1738 // First commit the memory. |
| 1739 HeapWord* old_end = (HeapWord*) _g1_storage.high(); | |
|
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1740 bool successful = _g1_storage.expand_by(aligned_expand_bytes); |
|
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|
1741 if (successful) { |
| 3766 | 1742 // Then propagate this update to the necessary data structures. |
| 1743 HeapWord* new_end = (HeapWord*) _g1_storage.high(); | |
| 1744 update_committed_space(old_end, new_end); | |
| 1745 | |
| 1746 FreeRegionList expansion_list("Local Expansion List"); | |
| 1747 MemRegion mr = _hrs.expand_by(old_end, new_end, &expansion_list); | |
| 1748 assert(mr.start() == old_end, "post-condition"); | |
| 1749 // mr might be a smaller region than what was requested if | |
| 1750 // expand_by() was unable to allocate the HeapRegion instances | |
| 1751 assert(mr.end() <= new_end, "post-condition"); | |
| 1752 | |
| 1753 size_t actual_expand_bytes = mr.byte_size(); | |
| 1754 assert(actual_expand_bytes <= aligned_expand_bytes, "post-condition"); | |
| 1755 assert(actual_expand_bytes == expansion_list.total_capacity_bytes(), | |
| 1756 "post-condition"); | |
| 1757 if (actual_expand_bytes < aligned_expand_bytes) { | |
| 1758 // We could not expand _hrs to the desired size. In this case we | |
| 1759 // need to shrink the committed space accordingly. | |
| 1760 assert(mr.end() < new_end, "invariant"); | |
| 1761 | |
| 1762 size_t diff_bytes = aligned_expand_bytes - actual_expand_bytes; | |
| 1763 // First uncommit the memory. | |
| 1764 _g1_storage.shrink_by(diff_bytes); | |
| 1765 // Then propagate this update to the necessary data structures. | |
| 1766 update_committed_space(new_end, mr.end()); | |
|
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1767 } |
| 3766 | 1768 _free_list.add_as_tail(&expansion_list); |
|
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1769 |
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1770 if (_hr_printer.is_active()) { |
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1771 HeapWord* curr = mr.start(); |
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1772 while (curr < mr.end()) { |
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1773 HeapWord* curr_end = curr + HeapRegion::GrainWords; |
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1774 _hr_printer.commit(curr, curr_end); |
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1775 curr = curr_end; |
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1776 } |
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1777 assert(curr == mr.end(), "post-condition"); |
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1778 } |
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1779 g1_policy()->record_new_heap_size(n_regions()); |
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1780 } else { |
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1781 ergo_verbose0(ErgoHeapSizing, |
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1782 "did not expand the heap", |
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1783 ergo_format_reason("heap expansion operation failed")); |
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1784 // The expansion of the virtual storage space was unsuccessful. |
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1785 // Let's see if it was because we ran out of swap. |
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1786 if (G1ExitOnExpansionFailure && |
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1787 _g1_storage.uncommitted_size() >= aligned_expand_bytes) { |
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1788 // We had head room... |
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1789 vm_exit_out_of_memory(aligned_expand_bytes, "G1 heap expansion"); |
| 342 | 1790 } |
| 1791 } | |
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1792 return successful; |
| 342 | 1793 } |
| 1794 | |
| 3766 | 1795 void G1CollectedHeap::shrink_helper(size_t shrink_bytes) { |
| 342 | 1796 size_t old_mem_size = _g1_storage.committed_size(); |
| 1797 size_t aligned_shrink_bytes = | |
| 1798 ReservedSpace::page_align_size_down(shrink_bytes); | |
| 1799 aligned_shrink_bytes = align_size_down(aligned_shrink_bytes, | |
| 1800 HeapRegion::GrainBytes); | |
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1801 uint num_regions_deleted = 0; |
| 3766 | 1802 MemRegion mr = _hrs.shrink_by(aligned_shrink_bytes, &num_regions_deleted); |
| 1803 HeapWord* old_end = (HeapWord*) _g1_storage.high(); | |
| 1804 assert(mr.end() == old_end, "post-condition"); | |
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1805 |
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1806 ergo_verbose3(ErgoHeapSizing, |
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1807 "shrink the heap", |
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1808 ergo_format_byte("requested shrinking amount") |
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1809 ergo_format_byte("aligned shrinking amount") |
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1810 ergo_format_byte("attempted shrinking amount"), |
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1811 shrink_bytes, aligned_shrink_bytes, mr.byte_size()); |
| 3766 | 1812 if (mr.byte_size() > 0) { |
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1813 if (_hr_printer.is_active()) { |
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1814 HeapWord* curr = mr.end(); |
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1815 while (curr > mr.start()) { |
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1816 HeapWord* curr_end = curr; |
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1817 curr -= HeapRegion::GrainWords; |
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1818 _hr_printer.uncommit(curr, curr_end); |
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1819 } |
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1820 assert(curr == mr.start(), "post-condition"); |
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1821 } |
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1822 |
| 342 | 1823 _g1_storage.shrink_by(mr.byte_size()); |
| 3766 | 1824 HeapWord* new_end = (HeapWord*) _g1_storage.high(); |
| 1825 assert(mr.start() == new_end, "post-condition"); | |
| 1826 | |
| 1827 _expansion_regions += num_regions_deleted; | |
| 1828 update_committed_space(old_end, new_end); | |
| 1829 HeapRegionRemSet::shrink_heap(n_regions()); | |
|
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1830 g1_policy()->record_new_heap_size(n_regions()); |
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1831 } else { |
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1832 ergo_verbose0(ErgoHeapSizing, |
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1833 "did not shrink the heap", |
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1834 ergo_format_reason("heap shrinking operation failed")); |
| 342 | 1835 } |
| 1836 } | |
| 1837 | |
| 1838 void G1CollectedHeap::shrink(size_t shrink_bytes) { | |
| 2152 | 1839 verify_region_sets_optional(); |
| 1840 | |
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1841 // We should only reach here at the end of a Full GC which means we |
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1842 // should not not be holding to any GC alloc regions. The method |
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1843 // below will make sure of that and do any remaining clean up. |
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1844 abandon_gc_alloc_regions(); |
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1845 |
| 2152 | 1846 // Instead of tearing down / rebuilding the free lists here, we |
| 1847 // could instead use the remove_all_pending() method on free_list to | |
| 1848 // remove only the ones that we need to remove. | |
| 4072 | 1849 tear_down_region_sets(true /* free_list_only */); |
| 342 | 1850 shrink_helper(shrink_bytes); |
| 4072 | 1851 rebuild_region_sets(true /* free_list_only */); |
| 2152 | 1852 |
| 3766 | 1853 _hrs.verify_optional(); |
| 2152 | 1854 verify_region_sets_optional(); |
| 342 | 1855 } |
| 1856 | |
| 1857 // Public methods. | |
| 1858 | |
| 1859 #ifdef _MSC_VER // the use of 'this' below gets a warning, make it go away | |
| 1860 #pragma warning( disable:4355 ) // 'this' : used in base member initializer list | |
| 1861 #endif // _MSC_VER | |
| 1862 | |
| 1863 | |
| 1864 G1CollectedHeap::G1CollectedHeap(G1CollectorPolicy* policy_) : | |
| 1865 SharedHeap(policy_), | |
| 1866 _g1_policy(policy_), | |
| 1111 | 1867 _dirty_card_queue_set(false), |
| 1705 | 1868 _into_cset_dirty_card_queue_set(false), |
|
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1869 _is_alive_closure_cm(this), |
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1870 _is_alive_closure_stw(this), |
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1871 _ref_processor_cm(NULL), |
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1872 _ref_processor_stw(NULL), |
| 342 | 1873 _process_strong_tasks(new SubTasksDone(G1H_PS_NumElements)), |
| 1874 _bot_shared(NULL), | |
| 1875 _objs_with_preserved_marks(NULL), _preserved_marks_of_objs(NULL), | |
| 1876 _evac_failure_scan_stack(NULL) , | |
| 1877 _mark_in_progress(false), | |
| 2152 | 1878 _cg1r(NULL), _summary_bytes_used(0), |
|
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1879 _g1mm(NULL), |
| 342 | 1880 _refine_cte_cl(NULL), |
| 1881 _full_collection(false), | |
| 2152 | 1882 _free_list("Master Free List"), |
| 1883 _secondary_free_list("Secondary Free List"), | |
| 4072 | 1884 _old_set("Old Set"), |
| 2152 | 1885 _humongous_set("Master Humongous Set"), |
| 1886 _free_regions_coming(false), | |
| 342 | 1887 _young_list(new YoungList(this)), |
| 1888 _gc_time_stamp(0), | |
|
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1889 _retained_old_gc_alloc_region(NULL), |
|
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1890 _expand_heap_after_alloc_failure(true), |
| 526 | 1891 _surviving_young_words(NULL), |
|
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1892 _old_marking_cycles_started(0), |
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1893 _old_marking_cycles_completed(0), |
| 526 | 1894 _in_cset_fast_test(NULL), |
|
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1895 _in_cset_fast_test_base(NULL), |
|
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1896 _dirty_cards_region_list(NULL), |
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1897 _worker_cset_start_region(NULL), |
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1898 _worker_cset_start_region_time_stamp(NULL) { |
| 342 | 1899 _g1h = this; // To catch bugs. |
| 1900 if (_process_strong_tasks == NULL || !_process_strong_tasks->valid()) { | |
| 1901 vm_exit_during_initialization("Failed necessary allocation."); | |
| 1902 } | |
|
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1903 |
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1904 _humongous_object_threshold_in_words = HeapRegion::GrainWords / 2; |
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1905 |
| 342 | 1906 int n_queues = MAX2((int)ParallelGCThreads, 1); |
| 1907 _task_queues = new RefToScanQueueSet(n_queues); | |
| 1908 | |
| 1909 int n_rem_sets = HeapRegionRemSet::num_par_rem_sets(); | |
| 1910 assert(n_rem_sets > 0, "Invariant."); | |
| 1911 | |
| 1912 HeapRegionRemSetIterator** iter_arr = | |
| 1913 NEW_C_HEAP_ARRAY(HeapRegionRemSetIterator*, n_queues); | |
| 1914 for (int i = 0; i < n_queues; i++) { | |
| 1915 iter_arr[i] = new HeapRegionRemSetIterator(); | |
| 1916 } | |
| 1917 _rem_set_iterator = iter_arr; | |
| 1918 | |
|
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1919 _worker_cset_start_region = NEW_C_HEAP_ARRAY(HeapRegion*, n_queues); |
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1920 _worker_cset_start_region_time_stamp = NEW_C_HEAP_ARRAY(unsigned int, n_queues); |
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1921 |
| 342 | 1922 for (int i = 0; i < n_queues; i++) { |
| 1923 RefToScanQueue* q = new RefToScanQueue(); | |
| 1924 q->initialize(); | |
| 1925 _task_queues->register_queue(i, q); | |
| 1926 } | |
| 1927 | |
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1928 clear_cset_start_regions(); |
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1929 |
| 342 | 1930 guarantee(_task_queues != NULL, "task_queues allocation failure."); |
| 1931 } | |
| 1932 | |
| 1933 jint G1CollectedHeap::initialize() { | |
| 1166 | 1934 CollectedHeap::pre_initialize(); |
| 342 | 1935 os::enable_vtime(); |
| 1936 | |
|
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1937 G1Log::init(); |
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1938 |
| 342 | 1939 // Necessary to satisfy locking discipline assertions. |
| 1940 | |
| 1941 MutexLocker x(Heap_lock); | |
| 1942 | |
|
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1943 // We have to initialize the printer before committing the heap, as |
|
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1944 // it will be used then. |
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1945 _hr_printer.set_active(G1PrintHeapRegions); |
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1946 |
| 342 | 1947 // While there are no constraints in the GC code that HeapWordSize |
| 1948 // be any particular value, there are multiple other areas in the | |
| 1949 // system which believe this to be true (e.g. oop->object_size in some | |
| 1950 // cases incorrectly returns the size in wordSize units rather than | |
| 1951 // HeapWordSize). | |
| 1952 guarantee(HeapWordSize == wordSize, "HeapWordSize must equal wordSize"); | |
| 1953 | |
| 1954 size_t init_byte_size = collector_policy()->initial_heap_byte_size(); | |
| 1955 size_t max_byte_size = collector_policy()->max_heap_byte_size(); | |
| 1956 | |
| 1957 // Ensure that the sizes are properly aligned. | |
| 1958 Universe::check_alignment(init_byte_size, HeapRegion::GrainBytes, "g1 heap"); | |
| 1959 Universe::check_alignment(max_byte_size, HeapRegion::GrainBytes, "g1 heap"); | |
| 1960 | |
| 1961 _cg1r = new ConcurrentG1Refine(); | |
| 1962 | |
| 1963 // Reserve the maximum. | |
| 1964 PermanentGenerationSpec* pgs = collector_policy()->permanent_generation(); | |
| 1965 // Includes the perm-gen. | |
|
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1966 |
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1967 // When compressed oops are enabled, the preferred heap base |
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1968 // is calculated by subtracting the requested size from the |
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1969 // 32Gb boundary and using the result as the base address for |
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1970 // heap reservation. If the requested size is not aligned to |
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1971 // HeapRegion::GrainBytes (i.e. the alignment that is passed |
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1972 // into the ReservedHeapSpace constructor) then the actual |
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1973 // base of the reserved heap may end up differing from the |
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1974 // address that was requested (i.e. the preferred heap base). |
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1975 // If this happens then we could end up using a non-optimal |
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1976 // compressed oops mode. |
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1977 |
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1978 // Since max_byte_size is aligned to the size of a heap region (checked |
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1979 // above), we also need to align the perm gen size as it might not be. |
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1980 const size_t total_reserved = max_byte_size + |
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1981 align_size_up(pgs->max_size(), HeapRegion::GrainBytes); |
|
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1982 Universe::check_alignment(total_reserved, HeapRegion::GrainBytes, "g1 heap and perm"); |
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1983 |
|
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1984 char* addr = Universe::preferred_heap_base(total_reserved, Universe::UnscaledNarrowOop); |
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1985 |
|
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1986 ReservedHeapSpace heap_rs(total_reserved, HeapRegion::GrainBytes, |
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1987 UseLargePages, addr); |
|
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1988 |
|
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1989 if (UseCompressedOops) { |
|
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1990 if (addr != NULL && !heap_rs.is_reserved()) { |
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1991 // Failed to reserve at specified address - the requested memory |
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1992 // region is taken already, for example, by 'java' launcher. |
|
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1993 // Try again to reserver heap higher. |
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1994 addr = Universe::preferred_heap_base(total_reserved, Universe::ZeroBasedNarrowOop); |
|
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1995 |
|
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1996 ReservedHeapSpace heap_rs0(total_reserved, HeapRegion::GrainBytes, |
|
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1997 UseLargePages, addr); |
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1998 |
|
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1999 if (addr != NULL && !heap_rs0.is_reserved()) { |
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2000 // Failed to reserve at specified address again - give up. |
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2001 addr = Universe::preferred_heap_base(total_reserved, Universe::HeapBasedNarrowOop); |
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2002 assert(addr == NULL, ""); |
|
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2003 |
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2004 ReservedHeapSpace heap_rs1(total_reserved, HeapRegion::GrainBytes, |
|
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2005 UseLargePages, addr); |
|
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2006 heap_rs = heap_rs1; |
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2007 } else { |
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2008 heap_rs = heap_rs0; |
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2009 } |
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2010 } |
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2011 } |
| 342 | 2012 |
| 2013 if (!heap_rs.is_reserved()) { | |
| 2014 vm_exit_during_initialization("Could not reserve enough space for object heap"); | |
| 2015 return JNI_ENOMEM; | |
| 2016 } | |
| 2017 | |
| 2018 // It is important to do this in a way such that concurrent readers can't | |
| 2019 // temporarily think somethings in the heap. (I've actually seen this | |
| 2020 // happen in asserts: DLD.) | |
| 2021 _reserved.set_word_size(0); | |
| 2022 _reserved.set_start((HeapWord*)heap_rs.base()); | |
| 2023 _reserved.set_end((HeapWord*)(heap_rs.base() + heap_rs.size())); | |
| 2024 | |
|
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2025 _expansion_regions = (uint) (max_byte_size / HeapRegion::GrainBytes); |
| 342 | 2026 |
| 2027 // Create the gen rem set (and barrier set) for the entire reserved region. | |
| 2028 _rem_set = collector_policy()->create_rem_set(_reserved, 2); | |
| 2029 set_barrier_set(rem_set()->bs()); | |
| 2030 if (barrier_set()->is_a(BarrierSet::ModRef)) { | |
| 2031 _mr_bs = (ModRefBarrierSet*)_barrier_set; | |
| 2032 } else { | |
| 2033 vm_exit_during_initialization("G1 requires a mod ref bs."); | |
| 2034 return JNI_ENOMEM; | |
| 2035 } | |
| 2036 | |
| 2037 // Also create a G1 rem set. | |
| 1861 | 2038 if (mr_bs()->is_a(BarrierSet::CardTableModRef)) { |
| 2039 _g1_rem_set = new G1RemSet(this, (CardTableModRefBS*)mr_bs()); | |
| 342 | 2040 } else { |
| 1861 | 2041 vm_exit_during_initialization("G1 requires a cardtable mod ref bs."); |
| 2042 return JNI_ENOMEM; | |
| 342 | 2043 } |
| 2044 | |
| 2045 // Carve out the G1 part of the heap. | |
| 2046 | |
| 2047 ReservedSpace g1_rs = heap_rs.first_part(max_byte_size); | |
| 2048 _g1_reserved = MemRegion((HeapWord*)g1_rs.base(), | |
| 2049 g1_rs.size()/HeapWordSize); | |
| 2050 ReservedSpace perm_gen_rs = heap_rs.last_part(max_byte_size); | |
| 2051 | |
| 2052 _perm_gen = pgs->init(perm_gen_rs, pgs->init_size(), rem_set()); | |
| 2053 | |
| 2054 _g1_storage.initialize(g1_rs, 0); | |
| 2055 _g1_committed = MemRegion((HeapWord*)_g1_storage.low(), (size_t) 0); | |
| 3766 | 2056 _hrs.initialize((HeapWord*) _g1_reserved.start(), |
| 2057 (HeapWord*) _g1_reserved.end(), | |
| 2058 _expansion_regions); | |
| 342 | 2059 |
|
807
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|
2060 // 6843694 - ensure that the maximum region index can fit |
|
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|
2061 // in the remembered set structures. |
|
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|
2062 const uint max_region_idx = (1U << (sizeof(RegionIdx_t)*BitsPerByte-1)) - 1; |
|
807
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|
2063 guarantee((max_regions() - 1) <= max_region_idx, "too many regions"); |
|
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|
2064 |
|
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|
2065 size_t max_cards_per_region = ((size_t)1 << (sizeof(CardIdx_t)*BitsPerByte-1)) - 1; |
|
942
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|
2066 guarantee(HeapRegion::CardsPerRegion > 0, "make sure it's initialized"); |
|
3986
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|
2067 guarantee(HeapRegion::CardsPerRegion < max_cards_per_region, |
|
942
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|
2068 "too many cards per region"); |
|
807
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|
2069 |
| 2152 | 2070 HeapRegionSet::set_unrealistically_long_length(max_regions() + 1); |
| 2071 | |
| 342 | 2072 _bot_shared = new G1BlockOffsetSharedArray(_reserved, |
| 2073 heap_word_size(init_byte_size)); | |
| 2074 | |
| 2075 _g1h = this; | |
| 2076 | |
|
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|
2077 _in_cset_fast_test_length = max_regions(); |
|
6010
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|
2078 _in_cset_fast_test_base = |
|
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|
2079 NEW_C_HEAP_ARRAY(bool, (size_t) _in_cset_fast_test_length); |
|
1394
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|
2080 |
|
1316cec51b4d
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|
2081 // We're biasing _in_cset_fast_test to avoid subtracting the |
|
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|
2082 // beginning of the heap every time we want to index; basically |
|
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|
2083 // it's the same with what we do with the card table. |
|
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|
2084 _in_cset_fast_test = _in_cset_fast_test_base - |
|
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2085 ((uintx) _g1_reserved.start() >> HeapRegion::LogOfHRGrainBytes); |
|
1394
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|
2086 |
|
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|
2087 // Clear the _cset_fast_test bitmap in anticipation of adding |
|
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|
2088 // regions to the incremental collection set for the first |
|
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|
2089 // evacuation pause. |
|
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|
2090 clear_cset_fast_test(); |
|
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2091 |
| 342 | 2092 // Create the ConcurrentMark data structure and thread. |
| 2093 // (Must do this late, so that "max_regions" is defined.) | |
|
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2094 _cm = new ConcurrentMark(heap_rs, max_regions()); |
| 342 | 2095 _cmThread = _cm->cmThread(); |
| 2096 | |
| 2097 // Initialize the from_card cache structure of HeapRegionRemSet. | |
| 2098 HeapRegionRemSet::init_heap(max_regions()); | |
| 2099 | |
| 677 | 2100 // Now expand into the initial heap size. |
|
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2101 if (!expand(init_byte_size)) { |
|
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2102 vm_exit_during_initialization("Failed to allocate initial heap."); |
|
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|
2103 return JNI_ENOMEM; |
|
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|
2104 } |
| 342 | 2105 |
| 2106 // Perform any initialization actions delegated to the policy. | |
| 2107 g1_policy()->init(); | |
| 2108 | |
| 2109 _refine_cte_cl = | |
| 2110 new RefineCardTableEntryClosure(ConcurrentG1RefineThread::sts(), | |
| 2111 g1_rem_set(), | |
| 2112 concurrent_g1_refine()); | |
| 2113 JavaThread::dirty_card_queue_set().set_closure(_refine_cte_cl); | |
| 2114 | |
| 2115 JavaThread::satb_mark_queue_set().initialize(SATB_Q_CBL_mon, | |
| 2116 SATB_Q_FL_lock, | |
| 1111 | 2117 G1SATBProcessCompletedThreshold, |
| 342 | 2118 Shared_SATB_Q_lock); |
| 794 | 2119 |
| 2120 JavaThread::dirty_card_queue_set().initialize(DirtyCardQ_CBL_mon, | |
| 2121 DirtyCardQ_FL_lock, | |
| 1111 | 2122 concurrent_g1_refine()->yellow_zone(), |
| 2123 concurrent_g1_refine()->red_zone(), | |
| 794 | 2124 Shared_DirtyCardQ_lock); |
| 2125 | |
|
616
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|
2126 if (G1DeferredRSUpdate) { |
|
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|
2127 dirty_card_queue_set().initialize(DirtyCardQ_CBL_mon, |
|
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|
2128 DirtyCardQ_FL_lock, |
| 1111 | 2129 -1, // never trigger processing |
| 2130 -1, // no limit on length | |
|
616
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|
2131 Shared_DirtyCardQ_lock, |
|
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|
2132 &JavaThread::dirty_card_queue_set()); |
|
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|
2133 } |
| 1705 | 2134 |
| 2135 // Initialize the card queue set used to hold cards containing | |
| 2136 // references into the collection set. | |
| 2137 _into_cset_dirty_card_queue_set.initialize(DirtyCardQ_CBL_mon, | |
| 2138 DirtyCardQ_FL_lock, | |
| 2139 -1, // never trigger processing | |
| 2140 -1, // no limit on length | |
| 2141 Shared_DirtyCardQ_lock, | |
| 2142 &JavaThread::dirty_card_queue_set()); | |
| 2143 | |
| 342 | 2144 // In case we're keeping closure specialization stats, initialize those |
| 2145 // counts and that mechanism. | |
| 2146 SpecializationStats::clear(); | |
| 2147 | |
| 2148 // Do later initialization work for concurrent refinement. | |
| 2149 _cg1r->init(); | |
| 2150 | |
|
2433
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|
2151 // Here we allocate the dummy full region that is required by the |
|
abdfc822206f
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|
2152 // G1AllocRegion class. If we don't pass an address in the reserved |
|
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|
2153 // space here, lots of asserts fire. |
| 3766 | 2154 |
| 2155 HeapRegion* dummy_region = new_heap_region(0 /* index of bottom region */, | |
| 2156 _g1_reserved.start()); | |
|
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|
2157 // We'll re-use the same region whether the alloc region will |
|
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|
2158 // require BOT updates or not and, if it doesn't, then a non-young |
|
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|
2159 // region will complain that it cannot support allocations without |
|
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2160 // BOT updates. So we'll tag the dummy region as young to avoid that. |
|
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|
2161 dummy_region->set_young(); |
|
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|
2162 // Make sure it's full. |
|
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|
2163 dummy_region->set_top(dummy_region->end()); |
|
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|
2164 G1AllocRegion::setup(this, dummy_region); |
|
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|
2165 |
|
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|
2166 init_mutator_alloc_region(); |
|
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|
2167 |
|
3289
b52782ae3880
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|
2168 // Do create of the monitoring and management support so that |
|
b52782ae3880
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|
2169 // values in the heap have been properly initialized. |
|
3980
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|
2170 _g1mm = new G1MonitoringSupport(this); |
|
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|
2171 |
| 342 | 2172 return JNI_OK; |
| 2173 } | |
| 2174 | |
| 2175 void G1CollectedHeap::ref_processing_init() { | |
|
1974
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|
2176 // Reference processing in G1 currently works as follows: |
|
fd1d227ef1b9
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|
2177 // |
|
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|
2178 // * There are two reference processor instances. One is |
|
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|
2179 // used to record and process discovered references |
|
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|
2180 // during concurrent marking; the other is used to |
|
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|
2181 // record and process references during STW pauses |
|
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|
2182 // (both full and incremental). |
|
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|
2183 // * Both ref processors need to 'span' the entire heap as |
|
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|
2184 // the regions in the collection set may be dotted around. |
|
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|
2185 // |
|
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|
2186 // * For the concurrent marking ref processor: |
|
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|
2187 // * Reference discovery is enabled at initial marking. |
|
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|
2188 // * Reference discovery is disabled and the discovered |
|
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|
2189 // references processed etc during remarking. |
|
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|
2190 // * Reference discovery is MT (see below). |
|
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2191 // * Reference discovery requires a barrier (see below). |
|
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|
2192 // * Reference processing may or may not be MT |
|
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|
2193 // (depending on the value of ParallelRefProcEnabled |
|
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|
2194 // and ParallelGCThreads). |
|
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|
2195 // * A full GC disables reference discovery by the CM |
|
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|
2196 // ref processor and abandons any entries on it's |
|
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|
2197 // discovered lists. |
|
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|
2198 // |
|
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|
2199 // * For the STW processor: |
|
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|
2200 // * Non MT discovery is enabled at the start of a full GC. |
|
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|
2201 // * Processing and enqueueing during a full GC is non-MT. |
|
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|
2202 // * During a full GC, references are processed after marking. |
|
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|
2203 // |
|
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|
2204 // * Discovery (may or may not be MT) is enabled at the start |
|
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|
2205 // of an incremental evacuation pause. |
|
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|
2206 // * References are processed near the end of a STW evacuation pause. |
|
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|
2207 // * For both types of GC: |
|
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|
2208 // * Discovery is atomic - i.e. not concurrent. |
|
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|
2209 // * Reference discovery will not need a barrier. |
|
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|
2210 |
| 342 | 2211 SharedHeap::ref_processing_init(); |
| 2212 MemRegion mr = reserved_region(); | |
|
3979
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|
2213 |
|
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|
2214 // Concurrent Mark ref processor |
|
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|
2215 _ref_processor_cm = |
|
2369
92da084fefc9
6668573: CMS: reference processing crash if ParallelCMSThreads > ParallelGCThreads
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diff
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|
2216 new ReferenceProcessor(mr, // span |
|
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|
2217 ParallelRefProcEnabled && (ParallelGCThreads > 1), |
|
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|
2218 // mt processing |
|
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|
2219 (int) ParallelGCThreads, |
|
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|
2220 // degree of mt processing |
|
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|
2221 (ParallelGCThreads > 1) || (ConcGCThreads > 1), |
|
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|
2222 // mt discovery |
|
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|
2223 (int) MAX2(ParallelGCThreads, ConcGCThreads), |
|
4dfb2df418f2
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|
2224 // degree of mt discovery |
|
4dfb2df418f2
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diff
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|
2225 false, |
|
4dfb2df418f2
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diff
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|
2226 // Reference discovery is not atomic |
|
4dfb2df418f2
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|
2227 &_is_alive_closure_cm, |
|
4dfb2df418f2
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diff
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|
2228 // is alive closure |
|
4dfb2df418f2
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|
2229 // (for efficiency/performance) |
|
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diff
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|
2230 true); |
|
4dfb2df418f2
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diff
changeset
|
2231 // Setting next fields of discovered |
|
4dfb2df418f2
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diff
changeset
|
2232 // lists requires a barrier. |
|
4dfb2df418f2
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diff
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|
2233 |
|
4dfb2df418f2
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diff
changeset
|
2234 // STW ref processor |
|
4dfb2df418f2
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diff
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|
2235 _ref_processor_stw = |
|
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diff
changeset
|
2236 new ReferenceProcessor(mr, // span |
|
4dfb2df418f2
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diff
changeset
|
2237 ParallelRefProcEnabled && (ParallelGCThreads > 1), |
|
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diff
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|
2238 // mt processing |
|
4dfb2df418f2
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changeset
|
2239 MAX2((int)ParallelGCThreads, 1), |
|
4dfb2df418f2
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diff
changeset
|
2240 // degree of mt processing |
|
4dfb2df418f2
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diff
changeset
|
2241 (ParallelGCThreads > 1), |
|
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diff
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|
2242 // mt discovery |
|
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|
2243 MAX2((int)ParallelGCThreads, 1), |
|
4dfb2df418f2
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diff
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|
2244 // degree of mt discovery |
|
4dfb2df418f2
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diff
changeset
|
2245 true, |
|
4dfb2df418f2
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diff
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|
2246 // Reference discovery is atomic |
|
4dfb2df418f2
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|
2247 &_is_alive_closure_stw, |
|
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|
2248 // is alive closure |
|
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diff
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|
2249 // (for efficiency/performance) |
|
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diff
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|
2250 false); |
|
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diff
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|
2251 // Setting next fields of discovered |
|
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|
2252 // lists requires a barrier. |
| 342 | 2253 } |
| 2254 | |
| 2255 size_t G1CollectedHeap::capacity() const { | |
| 2256 return _g1_committed.byte_size(); | |
| 2257 } | |
| 2258 | |
| 1705 | 2259 void G1CollectedHeap::iterate_dirty_card_closure(CardTableEntryClosure* cl, |
| 2260 DirtyCardQueue* into_cset_dcq, | |
| 2261 bool concurrent, | |
| 342 | 2262 int worker_i) { |
| 889 | 2263 // Clean cards in the hot card cache |
| 1705 | 2264 concurrent_g1_refine()->clean_up_cache(worker_i, g1_rem_set(), into_cset_dcq); |
| 889 | 2265 |
| 342 | 2266 DirtyCardQueueSet& dcqs = JavaThread::dirty_card_queue_set(); |
| 2267 int n_completed_buffers = 0; | |
| 1705 | 2268 while (dcqs.apply_closure_to_completed_buffer(cl, worker_i, 0, true)) { |
| 342 | 2269 n_completed_buffers++; |
| 2270 } | |
| 2271 g1_policy()->record_update_rs_processed_buffers(worker_i, | |
| 2272 (double) n_completed_buffers); | |
| 2273 dcqs.clear_n_completed_buffers(); | |
| 2274 assert(!dcqs.completed_buffers_exist_dirty(), "Completed buffers exist!"); | |
| 2275 } | |
| 2276 | |
| 2277 | |
| 2278 // Computes the sum of the storage used by the various regions. | |
| 2279 | |
| 2280 size_t G1CollectedHeap::used() const { | |
|
862
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|
2281 assert(Heap_lock->owner() != NULL, |
|
36b5611220a7
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|
2282 "Should be owned on this thread's behalf."); |
| 342 | 2283 size_t result = _summary_bytes_used; |
|
845
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|
2284 // Read only once in case it is set to NULL concurrently |
|
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|
2285 HeapRegion* hr = _mutator_alloc_region.get(); |
|
845
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|
2286 if (hr != NULL) |
|
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|
2287 result += hr->used(); |
| 342 | 2288 return result; |
| 2289 } | |
| 2290 | |
|
846
42d84bbbecf4
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|
2291 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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|
2292 size_t result = _summary_bytes_used; |
|
42d84bbbecf4
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|
2293 return result; |
|
42d84bbbecf4
6859911: G1: assert(Heap_lock->owner() = NULL, "Should be owned on this thread's behalf")
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|
2294 } |
|
42d84bbbecf4
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|
2295 |
| 342 | 2296 class SumUsedClosure: public HeapRegionClosure { |
| 2297 size_t _used; | |
| 2298 public: | |
| 2299 SumUsedClosure() : _used(0) {} | |
| 2300 bool doHeapRegion(HeapRegion* r) { | |
| 2301 if (!r->continuesHumongous()) { | |
| 2302 _used += r->used(); | |
| 2303 } | |
| 2304 return false; | |
| 2305 } | |
| 2306 size_t result() { return _used; } | |
| 2307 }; | |
| 2308 | |
| 2309 size_t G1CollectedHeap::recalculate_used() const { | |
| 2310 SumUsedClosure blk; | |
| 3766 | 2311 heap_region_iterate(&blk); |
| 342 | 2312 return blk.result(); |
| 2313 } | |
| 2314 | |
| 2315 size_t G1CollectedHeap::unsafe_max_alloc() { | |
| 2152 | 2316 if (free_regions() > 0) return HeapRegion::GrainBytes; |
| 342 | 2317 // otherwise, is there space in the current allocation region? |
| 2318 | |
| 2319 // We need to store the current allocation region in a local variable | |
| 2320 // here. The problem is that this method doesn't take any locks and | |
| 2321 // there may be other threads which overwrite the current allocation | |
| 2322 // region field. attempt_allocation(), for example, sets it to NULL | |
| 2323 // and this can happen *after* the NULL check here but before the call | |
| 2324 // to free(), resulting in a SIGSEGV. Note that this doesn't appear | |
| 2325 // to be a problem in the optimized build, since the two loads of the | |
| 2326 // current allocation region field are optimized away. | |
|
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|
2327 HeapRegion* hr = _mutator_alloc_region.get(); |
|
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|
2328 if (hr == NULL) { |
| 342 | 2329 return 0; |
| 2330 } | |
|
2433
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|
2331 return hr->free(); |
| 342 | 2332 } |
| 2333 | |
|
1656
4e5661ba9d98
6944166: G1: explicit GCs are not always handled correctly
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1611
diff
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|
2334 bool G1CollectedHeap::should_do_concurrent_full_gc(GCCause::Cause cause) { |
|
4910
caa4652b4414
7129892: G1: explicit marking cycle initiation might fail to initiate a marking cycle
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4875
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changeset
|
2335 switch (cause) { |
|
caa4652b4414
7129892: G1: explicit marking cycle initiation might fail to initiate a marking cycle
tonyp
parents:
4875
diff
changeset
|
2336 case GCCause::_gc_locker: return GCLockerInvokesConcurrent; |
|
caa4652b4414
7129892: G1: explicit marking cycle initiation might fail to initiate a marking cycle
tonyp
parents:
4875
diff
changeset
|
2337 case GCCause::_java_lang_system_gc: return ExplicitGCInvokesConcurrent; |
|
caa4652b4414
7129892: G1: explicit marking cycle initiation might fail to initiate a marking cycle
tonyp
parents:
4875
diff
changeset
|
2338 case GCCause::_g1_humongous_allocation: return true; |
|
caa4652b4414
7129892: G1: explicit marking cycle initiation might fail to initiate a marking cycle
tonyp
parents:
4875
diff
changeset
|
2339 default: return false; |
|
caa4652b4414
7129892: G1: explicit marking cycle initiation might fail to initiate a marking cycle
tonyp
parents:
4875
diff
changeset
|
2340 } |
|
1656
4e5661ba9d98
6944166: G1: explicit GCs are not always handled correctly
tonyp
parents:
1611
diff
changeset
|
2341 } |
|
4e5661ba9d98
6944166: G1: explicit GCs are not always handled correctly
tonyp
parents:
1611
diff
changeset
|
2342 |
|
3285
49a67202bc67
7011855: G1: non-product flag to artificially grow the heap
tonyp
parents:
2433
diff
changeset
|
2343 #ifndef PRODUCT |
|
49a67202bc67
7011855: G1: non-product flag to artificially grow the heap
tonyp
parents:
2433
diff
changeset
|
2344 void G1CollectedHeap::allocate_dummy_regions() { |
|
49a67202bc67
7011855: G1: non-product flag to artificially grow the heap
tonyp
parents:
2433
diff
changeset
|
2345 // Let's fill up most of the region |
|
49a67202bc67
7011855: G1: non-product flag to artificially grow the heap
tonyp
parents:
2433
diff
changeset
|
2346 size_t word_size = HeapRegion::GrainWords - 1024; |
|
49a67202bc67
7011855: G1: non-product flag to artificially grow the heap
tonyp
parents:
2433
diff
changeset
|
2347 // And as a result the region we'll allocate will be humongous. |
|
49a67202bc67
7011855: G1: non-product flag to artificially grow the heap
tonyp
parents:
2433
diff
changeset
|
2348 guarantee(isHumongous(word_size), "sanity"); |
|
49a67202bc67
7011855: G1: non-product flag to artificially grow the heap
tonyp
parents:
2433
diff
changeset
|
2349 |
|
49a67202bc67
7011855: G1: non-product flag to artificially grow the heap
tonyp
parents:
2433
diff
changeset
|
2350 for (uintx i = 0; i < G1DummyRegionsPerGC; ++i) { |
|
49a67202bc67
7011855: G1: non-product flag to artificially grow the heap
tonyp
parents:
2433
diff
changeset
|
2351 // Let's use the existing mechanism for the allocation |
|
49a67202bc67
7011855: G1: non-product flag to artificially grow the heap
tonyp
parents:
2433
diff
changeset
|
2352 HeapWord* dummy_obj = humongous_obj_allocate(word_size); |
|
49a67202bc67
7011855: G1: non-product flag to artificially grow the heap
tonyp
parents:
2433
diff
changeset
|
2353 if (dummy_obj != NULL) { |
|
49a67202bc67
7011855: G1: non-product flag to artificially grow the heap
tonyp
parents:
2433
diff
changeset
|
2354 MemRegion mr(dummy_obj, word_size); |
|
49a67202bc67
7011855: G1: non-product flag to artificially grow the heap
tonyp
parents:
2433
diff
changeset
|
2355 CollectedHeap::fill_with_object(mr); |
|
49a67202bc67
7011855: G1: non-product flag to artificially grow the heap
tonyp
parents:
2433
diff
changeset
|
2356 } else { |
|
49a67202bc67
7011855: G1: non-product flag to artificially grow the heap
tonyp
parents:
2433
diff
changeset
|
2357 // If we can't allocate once, we probably cannot allocate |
|
49a67202bc67
7011855: G1: non-product flag to artificially grow the heap
tonyp
parents:
2433
diff
changeset
|
2358 // again. Let's get out of the loop. |
|
49a67202bc67
7011855: G1: non-product flag to artificially grow the heap
tonyp
parents:
2433
diff
changeset
|
2359 break; |
|
49a67202bc67
7011855: G1: non-product flag to artificially grow the heap
tonyp
parents:
2433
diff
changeset
|
2360 } |
|
49a67202bc67
7011855: G1: non-product flag to artificially grow the heap
tonyp
parents:
2433
diff
changeset
|
2361 } |
|
49a67202bc67
7011855: G1: non-product flag to artificially grow the heap
tonyp
parents:
2433
diff
changeset
|
2362 } |
|
49a67202bc67
7011855: G1: non-product flag to artificially grow the heap
tonyp
parents:
2433
diff
changeset
|
2363 #endif // !PRODUCT |
|
49a67202bc67
7011855: G1: non-product flag to artificially grow the heap
tonyp
parents:
2433
diff
changeset
|
2364 |
|
6120
37552638d24a
7172388: G1: _total_full_collections should not be incremented for concurrent cycles
brutisso
parents:
6109
diff
changeset
|
2365 void G1CollectedHeap::increment_old_marking_cycles_started() { |
|
37552638d24a
7172388: G1: _total_full_collections should not be incremented for concurrent cycles
brutisso
parents:
6109
diff
changeset
|
2366 assert(_old_marking_cycles_started == _old_marking_cycles_completed || |
|
37552638d24a
7172388: G1: _total_full_collections should not be incremented for concurrent cycles
brutisso
parents:
6109
diff
changeset
|
2367 _old_marking_cycles_started == _old_marking_cycles_completed + 1, |
|
37552638d24a
7172388: G1: _total_full_collections should not be incremented for concurrent cycles
brutisso
parents:
6109
diff
changeset
|
2368 err_msg("Wrong marking cycle count (started: %d, completed: %d)", |
|
37552638d24a
7172388: G1: _total_full_collections should not be incremented for concurrent cycles
brutisso
parents:
6109
diff
changeset
|
2369 _old_marking_cycles_started, _old_marking_cycles_completed)); |
|
37552638d24a
7172388: G1: _total_full_collections should not be incremented for concurrent cycles
brutisso
parents:
6109
diff
changeset
|
2370 |
|
37552638d24a
7172388: G1: _total_full_collections should not be incremented for concurrent cycles
brutisso
parents:
6109
diff
changeset
|
2371 _old_marking_cycles_started++; |
|
37552638d24a
7172388: G1: _total_full_collections should not be incremented for concurrent cycles
brutisso
parents:
6109
diff
changeset
|
2372 } |
|
37552638d24a
7172388: G1: _total_full_collections should not be incremented for concurrent cycles
brutisso
parents:
6109
diff
changeset
|
2373 |
|
37552638d24a
7172388: G1: _total_full_collections should not be incremented for concurrent cycles
brutisso
parents:
6109
diff
changeset
|
2374 void G1CollectedHeap::increment_old_marking_cycles_completed(bool concurrent) { |
|
1656
4e5661ba9d98
6944166: G1: explicit GCs are not always handled correctly
tonyp
parents:
1611
diff
changeset
|
2375 MonitorLockerEx x(FullGCCount_lock, Mutex::_no_safepoint_check_flag); |
|
4e5661ba9d98
6944166: G1: explicit GCs are not always handled correctly
tonyp
parents:
1611
diff
changeset
|
2376 |
|
2030
fb712ff22571
7000559: G1: assertion failure !outer || (full_collections_started == _full_collections_completed + 1)
tonyp
parents:
1995
diff
changeset
|
2377 // We assume that if concurrent == true, then the caller is a |
|
fb712ff22571
7000559: G1: assertion failure !outer || (full_collections_started == _full_collections_completed + 1)
tonyp
parents:
1995
diff
changeset
|
2378 // concurrent thread that was joined the Suspendible Thread |
|
fb712ff22571
7000559: G1: assertion failure !outer || (full_collections_started == _full_collections_completed + 1)
tonyp
parents:
1995
diff
changeset
|
2379 // Set. If there's ever a cheap way to check this, we should add an |
|
fb712ff22571
7000559: G1: assertion failure !outer || (full_collections_started == _full_collections_completed + 1)
tonyp
parents:
1995
diff
changeset
|
2380 // assert here. |
|
fb712ff22571
7000559: G1: assertion failure !outer || (full_collections_started == _full_collections_completed + 1)
tonyp
parents:
1995
diff
changeset
|
2381 |
|
1656
4e5661ba9d98
6944166: G1: explicit GCs are not always handled correctly
tonyp
parents:
1611
diff
changeset
|
2382 // Given that this method is called at the end of a Full GC or of a |
|
4e5661ba9d98
6944166: G1: explicit GCs are not always handled correctly
tonyp
parents:
1611
diff
changeset
|
2383 // concurrent cycle, and those can be nested (i.e., a Full GC can |
|
4e5661ba9d98
6944166: G1: explicit GCs are not always handled correctly
tonyp
parents:
1611
diff
changeset
|
2384 // interrupt a concurrent cycle), the number of full collections |
|
4e5661ba9d98
6944166: G1: explicit GCs are not always handled correctly
tonyp
parents:
1611
diff
changeset
|
2385 // completed should be either one (in the case where there was no |
|
4e5661ba9d98
6944166: G1: explicit GCs are not always handled correctly
tonyp
parents:
1611
diff
changeset
|
2386 // nesting) or two (when a Full GC interrupted a concurrent cycle) |
|
4e5661ba9d98
6944166: G1: explicit GCs are not always handled correctly
tonyp
parents:
1611
diff
changeset
|
2387 // behind the number of full collections started. |
|
4e5661ba9d98
6944166: G1: explicit GCs are not always handled correctly
tonyp
parents:
1611
diff
changeset
|
2388 |
|
4e5661ba9d98
6944166: G1: explicit GCs are not always handled correctly
tonyp
parents:
1611
diff
changeset
|
2389 // This is the case for the inner caller, i.e. a Full GC. |
|
2030
fb712ff22571
7000559: G1: assertion failure !outer || (full_collections_started == _full_collections_completed + 1)
tonyp
parents:
1995
diff
changeset
|
2390 assert(concurrent || |
|
6120
37552638d24a
7172388: G1: _total_full_collections should not be incremented for concurrent cycles
brutisso
parents:
6109
diff
changeset
|
2391 (_old_marking_cycles_started == _old_marking_cycles_completed + 1) || |
|
37552638d24a
7172388: G1: _total_full_collections should not be incremented for concurrent cycles
brutisso
parents:
6109
diff
changeset
|
2392 (_old_marking_cycles_started == _old_marking_cycles_completed + 2), |
|
37552638d24a
7172388: G1: _total_full_collections should not be incremented for concurrent cycles
brutisso
parents:
6109
diff
changeset
|
2393 err_msg("for inner caller (Full GC): _old_marking_cycles_started = %u " |
|
37552638d24a
7172388: G1: _total_full_collections should not be incremented for concurrent cycles
brutisso
parents:
6109
diff
changeset
|
2394 "is inconsistent with _old_marking_cycles_completed = %u", |
|
37552638d24a
7172388: G1: _total_full_collections should not be incremented for concurrent cycles
brutisso
parents:
6109
diff
changeset
|
2395 _old_marking_cycles_started, _old_marking_cycles_completed)); |
|
1656
4e5661ba9d98
6944166: G1: explicit GCs are not always handled correctly
tonyp
parents:
1611
diff
changeset
|
2396 |
|
4e5661ba9d98
6944166: G1: explicit GCs are not always handled correctly
tonyp
parents:
1611
diff
changeset
|
2397 // This is the case for the outer caller, i.e. the concurrent cycle. |
|
2030
fb712ff22571
7000559: G1: assertion failure !outer || (full_collections_started == _full_collections_completed + 1)
tonyp
parents:
1995
diff
changeset
|
2398 assert(!concurrent || |
|
6120
37552638d24a
7172388: G1: _total_full_collections should not be incremented for concurrent cycles
brutisso
parents:
6109
diff
changeset
|
2399 (_old_marking_cycles_started == _old_marking_cycles_completed + 1), |
|
2030
fb712ff22571
7000559: G1: assertion failure !outer || (full_collections_started == _full_collections_completed + 1)
tonyp
parents:
1995
diff
changeset
|
2400 err_msg("for outer caller (concurrent cycle): " |
|
6120
37552638d24a
7172388: G1: _total_full_collections should not be incremented for concurrent cycles
brutisso
parents:
6109
diff
changeset
|
2401 "_old_marking_cycles_started = %u " |
|
37552638d24a
7172388: G1: _total_full_collections should not be incremented for concurrent cycles
brutisso
parents:
6109
diff
changeset
|
2402 "is inconsistent with _old_marking_cycles_completed = %u", |
|
37552638d24a
7172388: G1: _total_full_collections should not be incremented for concurrent cycles
brutisso
parents:
6109
diff
changeset
|
2403 _old_marking_cycles_started, _old_marking_cycles_completed)); |
|
37552638d24a
7172388: G1: _total_full_collections should not be incremented for concurrent cycles
brutisso
parents:
6109
diff
changeset
|
2404 |
|
37552638d24a
7172388: G1: _total_full_collections should not be incremented for concurrent cycles
brutisso
parents:
6109
diff
changeset
|
2405 _old_marking_cycles_completed += 1; |
|
1656
4e5661ba9d98
6944166: G1: explicit GCs are not always handled correctly
tonyp
parents:
1611
diff
changeset
|
2406 |
|
1840
4e0094bc41fa
6983311: G1: LoopTest hangs when run with -XX:+ExplicitInvokesConcurrent
johnc
parents:
1833
diff
changeset
|
2407 // We need to clear the "in_progress" flag in the CM thread before |
|
4e0094bc41fa
6983311: G1: LoopTest hangs when run with -XX:+ExplicitInvokesConcurrent
johnc
parents:
1833
diff
changeset
|
2408 // we wake up any waiters (especially when ExplicitInvokesConcurrent |
|
4e0094bc41fa
6983311: G1: LoopTest hangs when run with -XX:+ExplicitInvokesConcurrent
johnc
parents:
1833
diff
changeset
|
2409 // is set) so that if a waiter requests another System.gc() it doesn't |
|
4e0094bc41fa
6983311: G1: LoopTest hangs when run with -XX:+ExplicitInvokesConcurrent
johnc
parents:
1833
diff
changeset
|
2410 // incorrectly see that a marking cyle is still in progress. |
|
2030
fb712ff22571
7000559: G1: assertion failure !outer || (full_collections_started == _full_collections_completed + 1)
tonyp
parents:
1995
diff
changeset
|
2411 if (concurrent) { |
|
1840
4e0094bc41fa
6983311: G1: LoopTest hangs when run with -XX:+ExplicitInvokesConcurrent
johnc
parents:
1833
diff
changeset
|
2412 _cmThread->clear_in_progress(); |
|
4e0094bc41fa
6983311: G1: LoopTest hangs when run with -XX:+ExplicitInvokesConcurrent
johnc
parents:
1833
diff
changeset
|
2413 } |
|
4e0094bc41fa
6983311: G1: LoopTest hangs when run with -XX:+ExplicitInvokesConcurrent
johnc
parents:
1833
diff
changeset
|
2414 |
|
1656
4e5661ba9d98
6944166: G1: explicit GCs are not always handled correctly
tonyp
parents:
1611
diff
changeset
|
2415 // This notify_all() will ensure that a thread that called |
|
4e5661ba9d98
6944166: G1: explicit GCs are not always handled correctly
tonyp
parents:
1611
diff
changeset
|
2416 // System.gc() with (with ExplicitGCInvokesConcurrent set or not) |
|
4e5661ba9d98
6944166: G1: explicit GCs are not always handled correctly
tonyp
parents:
1611
diff
changeset
|
2417 // and it's waiting for a full GC to finish will be woken up. It is |
|
4e5661ba9d98
6944166: G1: explicit GCs are not always handled correctly
tonyp
parents:
1611
diff
changeset
|
2418 // waiting in VM_G1IncCollectionPause::doit_epilogue(). |
|
4e5661ba9d98
6944166: G1: explicit GCs are not always handled correctly
tonyp
parents:
1611
diff
changeset
|
2419 FullGCCount_lock->notify_all(); |
|
4e5661ba9d98
6944166: G1: explicit GCs are not always handled correctly
tonyp
parents:
1611
diff
changeset
|
2420 } |
|
4e5661ba9d98
6944166: G1: explicit GCs are not always handled correctly
tonyp
parents:
1611
diff
changeset
|
2421 |
| 342 | 2422 void G1CollectedHeap::collect_as_vm_thread(GCCause::Cause cause) { |
| 2152 | 2423 assert_at_safepoint(true /* should_be_vm_thread */); |
| 342 | 2424 GCCauseSetter gcs(this, cause); |
| 2425 switch (cause) { | |
| 2426 case GCCause::_heap_inspection: | |
| 2427 case GCCause::_heap_dump: { | |
| 2428 HandleMark hm; | |
| 2429 do_full_collection(false); // don't clear all soft refs | |
| 2430 break; | |
| 2431 } | |
| 2432 default: // XXX FIX ME | |
| 2433 ShouldNotReachHere(); // Unexpected use of this function | |
| 2434 } | |
| 2435 } | |
| 2436 | |
|
1088
3fc996d4edd2
6902303: G1: ScavengeALot should cause an incremental, rather than a full, collection
ysr
parents:
1045
diff
changeset
|
2437 void G1CollectedHeap::collect(GCCause::Cause cause) { |
|
4910
caa4652b4414
7129892: G1: explicit marking cycle initiation might fail to initiate a marking cycle
tonyp
parents:
4875
diff
changeset
|
2438 assert_heap_not_locked(); |
|
1088
3fc996d4edd2
6902303: G1: ScavengeALot should cause an incremental, rather than a full, collection
ysr
parents:
1045
diff
changeset
|
2439 |
|
1656
4e5661ba9d98
6944166: G1: explicit GCs are not always handled correctly
tonyp
parents:
1611
diff
changeset
|
2440 unsigned int gc_count_before; |
|
6120
37552638d24a
7172388: G1: _total_full_collections should not be incremented for concurrent cycles
brutisso
parents:
6109
diff
changeset
|
2441 unsigned int old_marking_count_before; |
|
4910
caa4652b4414
7129892: G1: explicit marking cycle initiation might fail to initiate a marking cycle
tonyp
parents:
4875
diff
changeset
|
2442 bool retry_gc; |
|
caa4652b4414
7129892: G1: explicit marking cycle initiation might fail to initiate a marking cycle
tonyp
parents:
4875
diff
changeset
|
2443 |
|
caa4652b4414
7129892: G1: explicit marking cycle initiation might fail to initiate a marking cycle
tonyp
parents:
4875
diff
changeset
|
2444 do { |
|
caa4652b4414
7129892: G1: explicit marking cycle initiation might fail to initiate a marking cycle
tonyp
parents:
4875
diff
changeset
|
2445 retry_gc = false; |
|
caa4652b4414
7129892: G1: explicit marking cycle initiation might fail to initiate a marking cycle
tonyp
parents:
4875
diff
changeset
|
2446 |
|
caa4652b4414
7129892: G1: explicit marking cycle initiation might fail to initiate a marking cycle
tonyp
parents:
4875
diff
changeset
|
2447 { |
|
caa4652b4414
7129892: G1: explicit marking cycle initiation might fail to initiate a marking cycle
tonyp
parents:
4875
diff
changeset
|
2448 MutexLocker ml(Heap_lock); |
|
caa4652b4414
7129892: G1: explicit marking cycle initiation might fail to initiate a marking cycle
tonyp
parents:
4875
diff
changeset
|
2449 |
|
caa4652b4414
7129892: G1: explicit marking cycle initiation might fail to initiate a marking cycle
tonyp
parents:
4875
diff
changeset
|
2450 // Read the GC count while holding the Heap_lock |
|
caa4652b4414
7129892: G1: explicit marking cycle initiation might fail to initiate a marking cycle
tonyp
parents:
4875
diff
changeset
|
2451 gc_count_before = total_collections(); |
|
6120
37552638d24a
7172388: G1: _total_full_collections should not be incremented for concurrent cycles
brutisso
parents:
6109
diff
changeset
|
2452 old_marking_count_before = _old_marking_cycles_started; |
|
4910
caa4652b4414
7129892: G1: explicit marking cycle initiation might fail to initiate a marking cycle
tonyp
parents:
4875
diff
changeset
|
2453 } |
|
caa4652b4414
7129892: G1: explicit marking cycle initiation might fail to initiate a marking cycle
tonyp
parents:
4875
diff
changeset
|
2454 |
|
caa4652b4414
7129892: G1: explicit marking cycle initiation might fail to initiate a marking cycle
tonyp
parents:
4875
diff
changeset
|
2455 if (should_do_concurrent_full_gc(cause)) { |
|
caa4652b4414
7129892: G1: explicit marking cycle initiation might fail to initiate a marking cycle
tonyp
parents:
4875
diff
changeset
|
2456 // Schedule an initial-mark evacuation pause that will start a |
|
caa4652b4414
7129892: G1: explicit marking cycle initiation might fail to initiate a marking cycle
tonyp
parents:
4875
diff
changeset
|
2457 // concurrent cycle. We're setting word_size to 0 which means that |
|
caa4652b4414
7129892: G1: explicit marking cycle initiation might fail to initiate a marking cycle
tonyp
parents:
4875
diff
changeset
|
2458 // we are not requesting a post-GC allocation. |
|
1656
4e5661ba9d98
6944166: G1: explicit GCs are not always handled correctly
tonyp
parents:
1611
diff
changeset
|
2459 VM_G1IncCollectionPause op(gc_count_before, |
| 1973 | 2460 0, /* word_size */ |
|
4910
caa4652b4414
7129892: G1: explicit marking cycle initiation might fail to initiate a marking cycle
tonyp
parents:
4875
diff
changeset
|
2461 true, /* should_initiate_conc_mark */ |
|
1656
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2462 g1_policy()->max_pause_time_ms(), |
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2463 cause); |
|
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2464 |
|
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2465 VMThread::execute(&op); |
|
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2466 if (!op.pause_succeeded()) { |
|
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2467 if (old_marking_count_before == _old_marking_cycles_started) { |
|
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2468 retry_gc = op.should_retry_gc(); |
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2469 } else { |
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2470 // A Full GC happened while we were trying to schedule the |
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2471 // initial-mark GC. No point in starting a new cycle given |
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2472 // that the whole heap was collected anyway. |
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2473 } |
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2474 |
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2475 if (retry_gc) { |
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2476 if (GC_locker::is_active_and_needs_gc()) { |
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2477 GC_locker::stall_until_clear(); |
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2478 } |
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2479 } |
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2480 } |
|
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2481 } else { |
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2482 if (cause == GCCause::_gc_locker |
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2483 DEBUG_ONLY(|| cause == GCCause::_scavenge_alot)) { |
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2484 |
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2485 // Schedule a standard evacuation pause. We're setting word_size |
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2486 // to 0 which means that we are not requesting a post-GC allocation. |
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2487 VM_G1IncCollectionPause op(gc_count_before, |
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2488 0, /* word_size */ |
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2489 false, /* should_initiate_conc_mark */ |
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2490 g1_policy()->max_pause_time_ms(), |
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2491 cause); |
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2492 VMThread::execute(&op); |
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2493 } else { |
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2494 // Schedule a Full GC. |
|
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2495 VM_G1CollectFull op(gc_count_before, old_marking_count_before, cause); |
|
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2496 VMThread::execute(&op); |
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2497 } |
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2498 } |
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2499 } while (retry_gc); |
| 342 | 2500 } |
| 2501 | |
| 2502 bool G1CollectedHeap::is_in(const void* p) const { | |
| 4708 | 2503 if (_g1_committed.contains(p)) { |
| 2504 // Given that we know that p is in the committed space, | |
| 2505 // heap_region_containing_raw() should successfully | |
| 2506 // return the containing region. | |
| 2507 HeapRegion* hr = heap_region_containing_raw(p); | |
| 342 | 2508 return hr->is_in(p); |
| 2509 } else { | |
| 2510 return _perm_gen->as_gen()->is_in(p); | |
| 2511 } | |
| 2512 } | |
| 2513 | |
| 2514 // Iteration functions. | |
| 2515 | |
| 2516 // Iterates an OopClosure over all ref-containing fields of objects | |
| 2517 // within a HeapRegion. | |
| 2518 | |
| 2519 class IterateOopClosureRegionClosure: public HeapRegionClosure { | |
| 2520 MemRegion _mr; | |
| 2521 OopClosure* _cl; | |
| 2522 public: | |
| 2523 IterateOopClosureRegionClosure(MemRegion mr, OopClosure* cl) | |
| 2524 : _mr(mr), _cl(cl) {} | |
| 2525 bool doHeapRegion(HeapRegion* r) { | |
| 2526 if (! r->continuesHumongous()) { | |
| 2527 r->oop_iterate(_cl); | |
| 2528 } | |
| 2529 return false; | |
| 2530 } | |
| 2531 }; | |
| 2532 | |
| 678 | 2533 void G1CollectedHeap::oop_iterate(OopClosure* cl, bool do_perm) { |
| 342 | 2534 IterateOopClosureRegionClosure blk(_g1_committed, cl); |
| 3766 | 2535 heap_region_iterate(&blk); |
| 678 | 2536 if (do_perm) { |
| 2537 perm_gen()->oop_iterate(cl); | |
| 2538 } | |
| 342 | 2539 } |
| 2540 | |
| 678 | 2541 void G1CollectedHeap::oop_iterate(MemRegion mr, OopClosure* cl, bool do_perm) { |
| 342 | 2542 IterateOopClosureRegionClosure blk(mr, cl); |
| 3766 | 2543 heap_region_iterate(&blk); |
| 678 | 2544 if (do_perm) { |
| 2545 perm_gen()->oop_iterate(cl); | |
| 2546 } | |
| 342 | 2547 } |
| 2548 | |
| 2549 // Iterates an ObjectClosure over all objects within a HeapRegion. | |
| 2550 | |
| 2551 class IterateObjectClosureRegionClosure: public HeapRegionClosure { | |
| 2552 ObjectClosure* _cl; | |
| 2553 public: | |
| 2554 IterateObjectClosureRegionClosure(ObjectClosure* cl) : _cl(cl) {} | |
| 2555 bool doHeapRegion(HeapRegion* r) { | |
| 2556 if (! r->continuesHumongous()) { | |
| 2557 r->object_iterate(_cl); | |
| 2558 } | |
| 2559 return false; | |
| 2560 } | |
| 2561 }; | |
| 2562 | |
| 678 | 2563 void G1CollectedHeap::object_iterate(ObjectClosure* cl, bool do_perm) { |
| 342 | 2564 IterateObjectClosureRegionClosure blk(cl); |
| 3766 | 2565 heap_region_iterate(&blk); |
| 678 | 2566 if (do_perm) { |
| 2567 perm_gen()->object_iterate(cl); | |
| 2568 } | |
| 342 | 2569 } |
| 2570 | |
| 2571 void G1CollectedHeap::object_iterate_since_last_GC(ObjectClosure* cl) { | |
| 2572 // FIXME: is this right? | |
| 2573 guarantee(false, "object_iterate_since_last_GC not supported by G1 heap"); | |
| 2574 } | |
| 2575 | |
| 2576 // Calls a SpaceClosure on a HeapRegion. | |
| 2577 | |
| 2578 class SpaceClosureRegionClosure: public HeapRegionClosure { | |
| 2579 SpaceClosure* _cl; | |
| 2580 public: | |
| 2581 SpaceClosureRegionClosure(SpaceClosure* cl) : _cl(cl) {} | |
| 2582 bool doHeapRegion(HeapRegion* r) { | |
| 2583 _cl->do_space(r); | |
| 2584 return false; | |
| 2585 } | |
| 2586 }; | |
| 2587 | |
| 2588 void G1CollectedHeap::space_iterate(SpaceClosure* cl) { | |
| 2589 SpaceClosureRegionClosure blk(cl); | |
| 3766 | 2590 heap_region_iterate(&blk); |
| 342 | 2591 } |
| 2592 | |
| 3766 | 2593 void G1CollectedHeap::heap_region_iterate(HeapRegionClosure* cl) const { |
| 2594 _hrs.iterate(cl); | |
| 342 | 2595 } |
| 2596 | |
| 2597 void G1CollectedHeap::heap_region_iterate_from(HeapRegion* r, | |
| 3766 | 2598 HeapRegionClosure* cl) const { |
| 2599 _hrs.iterate_from(r, cl); | |
| 342 | 2600 } |
| 2601 | |
| 2602 void | |
| 2603 G1CollectedHeap::heap_region_par_iterate_chunked(HeapRegionClosure* cl, | |
|
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2604 uint worker, |
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2605 uint no_of_par_workers, |
| 342 | 2606 jint claim_value) { |
|
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2607 const uint regions = n_regions(); |
|
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2608 const uint max_workers = (G1CollectedHeap::use_parallel_gc_threads() ? |
|
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2609 no_of_par_workers : |
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2610 1); |
|
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2611 assert(UseDynamicNumberOfGCThreads || |
|
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2612 no_of_par_workers == workers()->total_workers(), |
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2613 "Non dynamic should use fixed number of workers"); |
| 355 | 2614 // try to spread out the starting points of the workers |
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2615 const uint start_index = regions / max_workers * worker; |
| 355 | 2616 |
| 2617 // each worker will actually look at all regions | |
|
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2618 for (uint count = 0; count < regions; ++count) { |
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2619 const uint index = (start_index + count) % regions; |
| 355 | 2620 assert(0 <= index && index < regions, "sanity"); |
| 2621 HeapRegion* r = region_at(index); | |
| 2622 // we'll ignore "continues humongous" regions (we'll process them | |
| 2623 // when we come across their corresponding "start humongous" | |
| 2624 // region) and regions already claimed | |
| 2625 if (r->claim_value() == claim_value || r->continuesHumongous()) { | |
| 2626 continue; | |
| 2627 } | |
| 2628 // OK, try to claim it | |
| 342 | 2629 if (r->claimHeapRegion(claim_value)) { |
| 355 | 2630 // success! |
| 2631 assert(!r->continuesHumongous(), "sanity"); | |
| 2632 if (r->startsHumongous()) { | |
| 2633 // If the region is "starts humongous" we'll iterate over its | |
| 2634 // "continues humongous" first; in fact we'll do them | |
| 2635 // first. The order is important. In on case, calling the | |
| 2636 // closure on the "starts humongous" region might de-allocate | |
| 2637 // and clear all its "continues humongous" regions and, as a | |
| 2638 // result, we might end up processing them twice. So, we'll do | |
| 2639 // them first (notice: most closures will ignore them anyway) and | |
| 2640 // then we'll do the "starts humongous" region. | |
|
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2641 for (uint ch_index = index + 1; ch_index < regions; ++ch_index) { |
| 355 | 2642 HeapRegion* chr = region_at(ch_index); |
| 2643 | |
| 2644 // if the region has already been claimed or it's not | |
| 2645 // "continues humongous" we're done | |
| 2646 if (chr->claim_value() == claim_value || | |
| 2647 !chr->continuesHumongous()) { | |
| 2648 break; | |
| 2649 } | |
| 2650 | |
| 2651 // Noone should have claimed it directly. We can given | |
| 2652 // that we claimed its "starts humongous" region. | |
| 2653 assert(chr->claim_value() != claim_value, "sanity"); | |
| 2654 assert(chr->humongous_start_region() == r, "sanity"); | |
| 2655 | |
| 2656 if (chr->claimHeapRegion(claim_value)) { | |
| 2657 // we should always be able to claim it; noone else should | |
| 2658 // be trying to claim this region | |
| 2659 | |
| 2660 bool res2 = cl->doHeapRegion(chr); | |
| 2661 assert(!res2, "Should not abort"); | |
| 2662 | |
| 2663 // Right now, this holds (i.e., no closure that actually | |
| 2664 // does something with "continues humongous" regions | |
| 2665 // clears them). We might have to weaken it in the future, | |
| 2666 // but let's leave these two asserts here for extra safety. | |
| 2667 assert(chr->continuesHumongous(), "should still be the case"); | |
| 2668 assert(chr->humongous_start_region() == r, "sanity"); | |
| 2669 } else { | |
| 2670 guarantee(false, "we should not reach here"); | |
| 2671 } | |
| 2672 } | |
| 2673 } | |
| 2674 | |
| 2675 assert(!r->continuesHumongous(), "sanity"); | |
| 2676 bool res = cl->doHeapRegion(r); | |
| 2677 assert(!res, "Should not abort"); | |
| 2678 } | |
| 2679 } | |
| 2680 } | |
| 2681 | |
| 390 | 2682 class ResetClaimValuesClosure: public HeapRegionClosure { |
| 2683 public: | |
| 2684 bool doHeapRegion(HeapRegion* r) { | |
| 2685 r->set_claim_value(HeapRegion::InitialClaimValue); | |
| 2686 return false; | |
| 2687 } | |
| 2688 }; | |
| 2689 | |
|
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2690 void G1CollectedHeap::reset_heap_region_claim_values() { |
| 390 | 2691 ResetClaimValuesClosure blk; |
| 2692 heap_region_iterate(&blk); | |
| 2693 } | |
| 2694 | |
|
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2695 void G1CollectedHeap::reset_cset_heap_region_claim_values() { |
|
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2696 ResetClaimValuesClosure blk; |
|
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2697 collection_set_iterate(&blk); |
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2698 } |
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2699 |
| 355 | 2700 #ifdef ASSERT |
| 2701 // This checks whether all regions in the heap have the correct claim | |
| 2702 // value. I also piggy-backed on this a check to ensure that the | |
| 2703 // humongous_start_region() information on "continues humongous" | |
| 2704 // regions is correct. | |
| 2705 | |
| 2706 class CheckClaimValuesClosure : public HeapRegionClosure { | |
| 2707 private: | |
| 2708 jint _claim_value; | |
|
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2709 uint _failures; |
| 355 | 2710 HeapRegion* _sh_region; |
|
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2711 |
| 355 | 2712 public: |
| 2713 CheckClaimValuesClosure(jint claim_value) : | |
| 2714 _claim_value(claim_value), _failures(0), _sh_region(NULL) { } | |
| 2715 bool doHeapRegion(HeapRegion* r) { | |
| 2716 if (r->claim_value() != _claim_value) { | |
|
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2717 gclog_or_tty->print_cr("Region " HR_FORMAT ", " |
| 355 | 2718 "claim value = %d, should be %d", |
|
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2719 HR_FORMAT_PARAMS(r), |
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2720 r->claim_value(), _claim_value); |
| 355 | 2721 ++_failures; |
| 2722 } | |
| 2723 if (!r->isHumongous()) { | |
| 2724 _sh_region = NULL; | |
| 2725 } else if (r->startsHumongous()) { | |
| 2726 _sh_region = r; | |
| 2727 } else if (r->continuesHumongous()) { | |
| 2728 if (r->humongous_start_region() != _sh_region) { | |
|
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2729 gclog_or_tty->print_cr("Region " HR_FORMAT ", " |
| 355 | 2730 "HS = "PTR_FORMAT", should be "PTR_FORMAT, |
|
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2731 HR_FORMAT_PARAMS(r), |
| 355 | 2732 r->humongous_start_region(), |
| 2733 _sh_region); | |
| 2734 ++_failures; | |
| 342 | 2735 } |
| 2736 } | |
| 355 | 2737 return false; |
| 2738 } | |
|
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2739 uint failures() { return _failures; } |
| 355 | 2740 }; |
| 2741 | |
| 2742 bool G1CollectedHeap::check_heap_region_claim_values(jint claim_value) { | |
| 2743 CheckClaimValuesClosure cl(claim_value); | |
| 2744 heap_region_iterate(&cl); | |
| 2745 return cl.failures() == 0; | |
| 2746 } | |
|
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2747 |
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|
2748 class CheckClaimValuesInCSetHRClosure: public HeapRegionClosure { |
|
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|
2749 private: |
|
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|
2750 jint _claim_value; |
|
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|
2751 uint _failures; |
|
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|
2752 |
|
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|
2753 public: |
|
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|
2754 CheckClaimValuesInCSetHRClosure(jint claim_value) : |
|
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|
2755 _claim_value(claim_value), _failures(0) { } |
|
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|
2756 |
|
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|
2757 uint failures() { return _failures; } |
|
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|
2758 |
|
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|
2759 bool doHeapRegion(HeapRegion* hr) { |
|
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|
2760 assert(hr->in_collection_set(), "how?"); |
|
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|
2761 assert(!hr->isHumongous(), "H-region in CSet"); |
|
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|
2762 if (hr->claim_value() != _claim_value) { |
|
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|
2763 gclog_or_tty->print_cr("CSet Region " HR_FORMAT ", " |
|
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|
2764 "claim value = %d, should be %d", |
|
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|
2765 HR_FORMAT_PARAMS(hr), |
|
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|
2766 hr->claim_value(), _claim_value); |
|
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|
2767 _failures += 1; |
|
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|
2768 } |
|
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|
2769 return false; |
|
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|
2770 } |
|
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|
2771 }; |
|
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|
2772 |
|
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|
2773 bool G1CollectedHeap::check_cset_heap_region_claim_values(jint claim_value) { |
|
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|
2774 CheckClaimValuesInCSetHRClosure cl(claim_value); |
|
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|
2775 collection_set_iterate(&cl); |
|
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|
2776 return cl.failures() == 0; |
|
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|
2777 } |
| 355 | 2778 #endif // ASSERT |
| 342 | 2779 |
|
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7119908: G1: Cache CSet start region for each worker for subsequent reuse
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changeset
|
2780 // Clear the cached CSet starting regions and (more importantly) |
|
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|
2781 // the time stamps. Called when we reset the GC time stamp. |
|
fd2b426c30db
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|
2782 void G1CollectedHeap::clear_cset_start_regions() { |
|
fd2b426c30db
7119908: G1: Cache CSet start region for each worker for subsequent reuse
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changeset
|
2783 assert(_worker_cset_start_region != NULL, "sanity"); |
|
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changeset
|
2784 assert(_worker_cset_start_region_time_stamp != NULL, "sanity"); |
|
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|
2785 |
|
fd2b426c30db
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|
2786 int n_queues = MAX2((int)ParallelGCThreads, 1); |
|
fd2b426c30db
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changeset
|
2787 for (int i = 0; i < n_queues; i++) { |
|
fd2b426c30db
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changeset
|
2788 _worker_cset_start_region[i] = NULL; |
|
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changeset
|
2789 _worker_cset_start_region_time_stamp[i] = 0; |
|
fd2b426c30db
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|
2790 } |
|
fd2b426c30db
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|
2791 } |
|
fd2b426c30db
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|
2792 |
|
fd2b426c30db
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changeset
|
2793 // Given the id of a worker, obtain or calculate a suitable |
|
fd2b426c30db
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changeset
|
2794 // starting region for iterating over the current collection set. |
|
4097
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|
2795 HeapRegion* G1CollectedHeap::start_cset_region_for_worker(int worker_i) { |
|
4709
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7119908: G1: Cache CSet start region for each worker for subsequent reuse
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changeset
|
2796 assert(get_gc_time_stamp() > 0, "should have been updated by now"); |
|
fd2b426c30db
7119908: G1: Cache CSet start region for each worker for subsequent reuse
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|
2797 |
|
fd2b426c30db
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changeset
|
2798 HeapRegion* result = NULL; |
|
fd2b426c30db
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diff
changeset
|
2799 unsigned gc_time_stamp = get_gc_time_stamp(); |
|
fd2b426c30db
7119908: G1: Cache CSet start region for each worker for subsequent reuse
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|
2800 |
|
fd2b426c30db
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changeset
|
2801 if (_worker_cset_start_region_time_stamp[worker_i] == gc_time_stamp) { |
|
fd2b426c30db
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|
2802 // Cached starting region for current worker was set |
|
fd2b426c30db
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changeset
|
2803 // during the current pause - so it's valid. |
|
fd2b426c30db
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changeset
|
2804 // Note: the cached starting heap region may be NULL |
|
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|
2805 // (when the collection set is empty). |
|
fd2b426c30db
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changeset
|
2806 result = _worker_cset_start_region[worker_i]; |
|
fd2b426c30db
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changeset
|
2807 assert(result == NULL || result->in_collection_set(), "sanity"); |
|
fd2b426c30db
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changeset
|
2808 return result; |
|
fd2b426c30db
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diff
changeset
|
2809 } |
|
fd2b426c30db
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diff
changeset
|
2810 |
|
fd2b426c30db
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changeset
|
2811 // The cached entry was not valid so let's calculate |
|
fd2b426c30db
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changeset
|
2812 // a suitable starting heap region for this worker. |
|
fd2b426c30db
7119908: G1: Cache CSet start region for each worker for subsequent reuse
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|
2813 |
|
fd2b426c30db
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changeset
|
2814 // We want the parallel threads to start their collection |
|
fd2b426c30db
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changeset
|
2815 // set iteration at different collection set regions to |
|
fd2b426c30db
7119908: G1: Cache CSet start region for each worker for subsequent reuse
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diff
changeset
|
2816 // avoid contention. |
|
fd2b426c30db
7119908: G1: Cache CSet start region for each worker for subsequent reuse
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diff
changeset
|
2817 // If we have: |
|
fd2b426c30db
7119908: G1: Cache CSet start region for each worker for subsequent reuse
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diff
changeset
|
2818 // n collection set regions |
|
fd2b426c30db
7119908: G1: Cache CSet start region for each worker for subsequent reuse
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diff
changeset
|
2819 // p threads |
|
fd2b426c30db
7119908: G1: Cache CSet start region for each worker for subsequent reuse
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diff
changeset
|
2820 // Then thread t will start at region floor ((t * n) / p) |
|
fd2b426c30db
7119908: G1: Cache CSet start region for each worker for subsequent reuse
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|
2821 |
|
fd2b426c30db
7119908: G1: Cache CSet start region for each worker for subsequent reuse
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diff
changeset
|
2822 result = g1_policy()->collection_set(); |
|
4097
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|
2823 if (G1CollectedHeap::use_parallel_gc_threads()) { |
|
6010
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|
2824 uint cs_size = g1_policy()->cset_region_length(); |
|
4728
441e946dc1af
7121618: Change type of number of GC workers to unsigned int.
jmasa
parents:
4711
diff
changeset
|
2825 uint active_workers = workers()->active_workers(); |
|
4709
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7119908: G1: Cache CSet start region for each worker for subsequent reuse
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changeset
|
2826 assert(UseDynamicNumberOfGCThreads || |
|
fd2b426c30db
7119908: G1: Cache CSet start region for each worker for subsequent reuse
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changeset
|
2827 active_workers == workers()->total_workers(), |
|
fd2b426c30db
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changeset
|
2828 "Unless dynamic should use total workers"); |
|
fd2b426c30db
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changeset
|
2829 |
|
6010
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changeset
|
2830 uint end_ind = (cs_size * worker_i) / active_workers; |
|
720b6a76dd9d
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|
2831 uint start_ind = 0; |
|
4709
fd2b426c30db
7119908: G1: Cache CSet start region for each worker for subsequent reuse
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diff
changeset
|
2832 |
|
fd2b426c30db
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diff
changeset
|
2833 if (worker_i > 0 && |
|
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diff
changeset
|
2834 _worker_cset_start_region_time_stamp[worker_i - 1] == gc_time_stamp) { |
|
fd2b426c30db
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diff
changeset
|
2835 // Previous workers starting region is valid |
|
fd2b426c30db
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diff
changeset
|
2836 // so let's iterate from there |
|
fd2b426c30db
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diff
changeset
|
2837 start_ind = (cs_size * (worker_i - 1)) / active_workers; |
|
fd2b426c30db
7119908: G1: Cache CSet start region for each worker for subsequent reuse
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diff
changeset
|
2838 result = _worker_cset_start_region[worker_i - 1]; |
|
fd2b426c30db
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diff
changeset
|
2839 } |
|
fd2b426c30db
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diff
changeset
|
2840 |
|
6010
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changeset
|
2841 for (uint i = start_ind; i < end_ind; i++) { |
|
4097
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|
2842 result = result->next_in_collection_set(); |
|
dc467e8b2c5e
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4095
diff
changeset
|
2843 } |
|
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4095
diff
changeset
|
2844 } |
|
4709
fd2b426c30db
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diff
changeset
|
2845 |
|
fd2b426c30db
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diff
changeset
|
2846 // Note: the calculated starting heap region may be NULL |
|
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diff
changeset
|
2847 // (when the collection set is empty). |
|
fd2b426c30db
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diff
changeset
|
2848 assert(result == NULL || result->in_collection_set(), "sanity"); |
|
fd2b426c30db
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4708
diff
changeset
|
2849 assert(_worker_cset_start_region_time_stamp[worker_i] != gc_time_stamp, |
|
fd2b426c30db
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4708
diff
changeset
|
2850 "should be updated only once per pause"); |
|
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diff
changeset
|
2851 _worker_cset_start_region[worker_i] = result; |
|
fd2b426c30db
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4708
diff
changeset
|
2852 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
|
2853 _worker_cset_start_region_time_stamp[worker_i] = gc_time_stamp; |
|
4097
dc467e8b2c5e
7112743: G1: Reduce overhead of marking closure during evacuation pauses
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4095
diff
changeset
|
2854 return result; |
|
dc467e8b2c5e
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4095
diff
changeset
|
2855 } |
|
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changeset
|
2856 |
| 342 | 2857 void G1CollectedHeap::collection_set_iterate(HeapRegionClosure* cl) { |
| 2858 HeapRegion* r = g1_policy()->collection_set(); | |
| 2859 while (r != NULL) { | |
| 2860 HeapRegion* next = r->next_in_collection_set(); | |
| 2861 if (cl->doHeapRegion(r)) { | |
| 2862 cl->incomplete(); | |
| 2863 return; | |
| 2864 } | |
| 2865 r = next; | |
| 2866 } | |
| 2867 } | |
| 2868 | |
| 2869 void G1CollectedHeap::collection_set_iterate_from(HeapRegion* r, | |
| 2870 HeapRegionClosure *cl) { | |
|
1656
4e5661ba9d98
6944166: G1: explicit GCs are not always handled correctly
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1611
diff
changeset
|
2871 if (r == NULL) { |
|
4e5661ba9d98
6944166: G1: explicit GCs are not always handled correctly
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1611
diff
changeset
|
2872 // The CSet is empty so there's nothing to do. |
|
4e5661ba9d98
6944166: G1: explicit GCs are not always handled correctly
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parents:
1611
diff
changeset
|
2873 return; |
|
4e5661ba9d98
6944166: G1: explicit GCs are not always handled correctly
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parents:
1611
diff
changeset
|
2874 } |
|
4e5661ba9d98
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1611
diff
changeset
|
2875 |
| 342 | 2876 assert(r->in_collection_set(), |
| 2877 "Start region must be a member of the collection set."); | |
| 2878 HeapRegion* cur = r; | |
| 2879 while (cur != NULL) { | |
| 2880 HeapRegion* next = cur->next_in_collection_set(); | |
| 2881 if (cl->doHeapRegion(cur) && false) { | |
| 2882 cl->incomplete(); | |
| 2883 return; | |
| 2884 } | |
| 2885 cur = next; | |
| 2886 } | |
| 2887 cur = g1_policy()->collection_set(); | |
| 2888 while (cur != r) { | |
| 2889 HeapRegion* next = cur->next_in_collection_set(); | |
| 2890 if (cl->doHeapRegion(cur) && false) { | |
| 2891 cl->incomplete(); | |
| 2892 return; | |
| 2893 } | |
| 2894 cur = next; | |
| 2895 } | |
| 2896 } | |
| 2897 | |
| 2898 CompactibleSpace* G1CollectedHeap::first_compactible_space() { | |
| 3766 | 2899 return n_regions() > 0 ? region_at(0) : NULL; |
| 342 | 2900 } |
| 2901 | |
| 2902 | |
| 2903 Space* G1CollectedHeap::space_containing(const void* addr) const { | |
| 2904 Space* res = heap_region_containing(addr); | |
| 2905 if (res == NULL) | |
| 2906 res = perm_gen()->space_containing(addr); | |
| 2907 return res; | |
| 2908 } | |
| 2909 | |
| 2910 HeapWord* G1CollectedHeap::block_start(const void* addr) const { | |
| 2911 Space* sp = space_containing(addr); | |
| 2912 if (sp != NULL) { | |
| 2913 return sp->block_start(addr); | |
| 2914 } | |
| 2915 return NULL; | |
| 2916 } | |
| 2917 | |
| 2918 size_t G1CollectedHeap::block_size(const HeapWord* addr) const { | |
| 2919 Space* sp = space_containing(addr); | |
| 2920 assert(sp != NULL, "block_size of address outside of heap"); | |
| 2921 return sp->block_size(addr); | |
| 2922 } | |
| 2923 | |
| 2924 bool G1CollectedHeap::block_is_obj(const HeapWord* addr) const { | |
| 2925 Space* sp = space_containing(addr); | |
| 2926 return sp->block_is_obj(addr); | |
| 2927 } | |
| 2928 | |
| 2929 bool G1CollectedHeap::supports_tlab_allocation() const { | |
| 2930 return true; | |
| 2931 } | |
| 2932 | |
| 2933 size_t G1CollectedHeap::tlab_capacity(Thread* ignored) const { | |
| 2934 return HeapRegion::GrainBytes; | |
| 2935 } | |
| 2936 | |
| 2937 size_t G1CollectedHeap::unsafe_max_tlab_alloc(Thread* ignored) const { | |
| 2938 // Return the remaining space in the cur alloc region, but not less than | |
| 2939 // the min TLAB size. | |
|
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|
2940 |
|
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|
2941 // Also, this value can be at most the humongous object threshold, |
|
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|
2942 // since we can't allow tlabs to grow big enough to accomodate |
|
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|
2943 // humongous objects. |
|
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|
2944 |
|
2433
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|
2945 HeapRegion* hr = _mutator_alloc_region.get(); |
|
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|
2946 size_t max_tlab_size = _humongous_object_threshold_in_words * wordSize; |
|
2433
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|
2947 if (hr == NULL) { |
|
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|
2948 return max_tlab_size; |
| 342 | 2949 } else { |
|
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|
2950 return MIN2(MAX2(hr->free(), (size_t) MinTLABSize), max_tlab_size); |
| 342 | 2951 } |
| 2952 } | |
| 2953 | |
| 2954 size_t G1CollectedHeap::max_capacity() const { | |
|
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|
2955 return _g1_reserved.byte_size(); |
| 342 | 2956 } |
| 2957 | |
| 2958 jlong G1CollectedHeap::millis_since_last_gc() { | |
| 2959 // assert(false, "NYI"); | |
| 2960 return 0; | |
| 2961 } | |
| 2962 | |
| 2963 void G1CollectedHeap::prepare_for_verify() { | |
| 2964 if (SafepointSynchronize::is_at_safepoint() || ! UseTLAB) { | |
| 2965 ensure_parsability(false); | |
| 2966 } | |
| 2967 g1_rem_set()->prepare_for_verify(); | |
| 2968 } | |
| 2969 | |
| 2970 class VerifyLivenessOopClosure: public OopClosure { | |
|
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|
2971 G1CollectedHeap* _g1h; |
|
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|
2972 VerifyOption _vo; |
| 342 | 2973 public: |
|
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|
2974 VerifyLivenessOopClosure(G1CollectedHeap* g1h, VerifyOption vo): |
|
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|
2975 _g1h(g1h), _vo(vo) |
|
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|
2976 { } |
|
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|
2977 void do_oop(narrowOop *p) { do_oop_work(p); } |
|
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|
2978 void do_oop( oop *p) { do_oop_work(p); } |
|
df6caf649ff7
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|
2979 |
|
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|
2980 template <class T> void do_oop_work(T *p) { |
|
df6caf649ff7
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|
2981 oop obj = oopDesc::load_decode_heap_oop(p); |
|
3772
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|
2982 guarantee(obj == NULL || !_g1h->is_obj_dead_cond(obj, _vo), |
|
845
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|
2983 "Dead object referenced by a not dead object"); |
| 342 | 2984 } |
| 2985 }; | |
| 2986 | |
| 2987 class VerifyObjsInRegionClosure: public ObjectClosure { | |
| 811 | 2988 private: |
| 342 | 2989 G1CollectedHeap* _g1h; |
| 2990 size_t _live_bytes; | |
| 2991 HeapRegion *_hr; | |
|
3772
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|
2992 VerifyOption _vo; |
| 342 | 2993 public: |
|
3772
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parents:
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diff
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|
2994 // _vo == UsePrevMarking -> use "prev" marking information, |
|
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|
2995 // _vo == UseNextMarking -> use "next" marking information, |
|
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|
2996 // _vo == UseMarkWord -> use mark word from object header. |
|
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|
2997 VerifyObjsInRegionClosure(HeapRegion *hr, VerifyOption vo) |
|
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|
2998 : _live_bytes(0), _hr(hr), _vo(vo) { |
| 342 | 2999 _g1h = G1CollectedHeap::heap(); |
| 3000 } | |
| 3001 void do_object(oop o) { | |
|
3772
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|
3002 VerifyLivenessOopClosure isLive(_g1h, _vo); |
| 342 | 3003 assert(o != NULL, "Huh?"); |
|
3772
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|
3004 if (!_g1h->is_obj_dead_cond(o, _vo)) { |
|
6747fd0512e0
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|
3005 // If the object is alive according to the mark word, |
|
6747fd0512e0
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|
3006 // then verify that the marking information agrees. |
|
6747fd0512e0
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changeset
|
3007 // Note we can't verify the contra-positive of the |
|
6747fd0512e0
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|
3008 // above: if the object is dead (according to the mark |
|
6747fd0512e0
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changeset
|
3009 // word), it may not be marked, or may have been marked |
|
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changeset
|
3010 // but has since became dead, or may have been allocated |
|
6747fd0512e0
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diff
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|
3011 // since the last marking. |
|
6747fd0512e0
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changeset
|
3012 if (_vo == VerifyOption_G1UseMarkWord) { |
|
6747fd0512e0
7004681: G1: Extend marking verification to Full GCs
johnc
parents:
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changeset
|
3013 guarantee(!_g1h->is_obj_dead(o), "mark word and concurrent mark mismatch"); |
|
6747fd0512e0
7004681: G1: Extend marking verification to Full GCs
johnc
parents:
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changeset
|
3014 } |
|
6747fd0512e0
7004681: G1: Extend marking verification to Full GCs
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diff
changeset
|
3015 |
| 342 | 3016 o->oop_iterate(&isLive); |
|
1389
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6943926: G1: Integer overflow during heap region verification
johnc
parents:
1388
diff
changeset
|
3017 if (!_hr->obj_allocated_since_prev_marking(o)) { |
|
5dbd9300cf9c
6943926: G1: Integer overflow during heap region verification
johnc
parents:
1388
diff
changeset
|
3018 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
|
3019 _live_bytes += (obj_size * HeapWordSize); |
|
5dbd9300cf9c
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diff
changeset
|
3020 } |
| 342 | 3021 } |
| 3022 } | |
| 3023 size_t live_bytes() { return _live_bytes; } | |
| 3024 }; | |
| 3025 | |
| 3026 class PrintObjsInRegionClosure : public ObjectClosure { | |
| 3027 HeapRegion *_hr; | |
| 3028 G1CollectedHeap *_g1; | |
| 3029 public: | |
| 3030 PrintObjsInRegionClosure(HeapRegion *hr) : _hr(hr) { | |
| 3031 _g1 = G1CollectedHeap::heap(); | |
| 3032 }; | |
| 3033 | |
| 3034 void do_object(oop o) { | |
| 3035 if (o != NULL) { | |
| 3036 HeapWord *start = (HeapWord *) o; | |
| 3037 size_t word_sz = o->size(); | |
| 3038 gclog_or_tty->print("\nPrinting obj "PTR_FORMAT" of size " SIZE_FORMAT | |
| 3039 " isMarkedPrev %d isMarkedNext %d isAllocSince %d\n", | |
| 3040 (void*) o, word_sz, | |
| 3041 _g1->isMarkedPrev(o), | |
| 3042 _g1->isMarkedNext(o), | |
| 3043 _hr->obj_allocated_since_prev_marking(o)); | |
| 3044 HeapWord *end = start + word_sz; | |
| 3045 HeapWord *cur; | |
| 3046 int *val; | |
| 3047 for (cur = start; cur < end; cur++) { | |
| 3048 val = (int *) cur; | |
| 3049 gclog_or_tty->print("\t "PTR_FORMAT":"PTR_FORMAT"\n", val, *val); | |
| 3050 } | |
| 3051 } | |
| 3052 } | |
| 3053 }; | |
| 3054 | |
| 3055 class VerifyRegionClosure: public HeapRegionClosure { | |
| 811 | 3056 private: |
|
3772
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diff
changeset
|
3057 bool _par; |
|
6747fd0512e0
7004681: G1: Extend marking verification to Full GCs
johnc
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3766
diff
changeset
|
3058 VerifyOption _vo; |
|
6747fd0512e0
7004681: G1: Extend marking verification to Full GCs
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diff
changeset
|
3059 bool _failures; |
| 811 | 3060 public: |
|
3772
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7004681: G1: Extend marking verification to Full GCs
johnc
parents:
3766
diff
changeset
|
3061 // _vo == UsePrevMarking -> use "prev" marking information, |
|
6747fd0512e0
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johnc
parents:
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diff
changeset
|
3062 // _vo == UseNextMarking -> use "next" marking information, |
|
6747fd0512e0
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johnc
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3766
diff
changeset
|
3063 // _vo == UseMarkWord -> use mark word from object header. |
| 6008 | 3064 VerifyRegionClosure(bool par, VerifyOption vo) |
| 3065 : _par(par), | |
|
3772
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7004681: G1: Extend marking verification to Full GCs
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diff
changeset
|
3066 _vo(vo), |
|
1020
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1019
diff
changeset
|
3067 _failures(false) {} |
|
ff2402f6a50b
6882730: G1: parallel heap verification messes up region dump
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parents:
1019
diff
changeset
|
3068 |
|
ff2402f6a50b
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parents:
1019
diff
changeset
|
3069 bool failures() { |
|
ff2402f6a50b
6882730: G1: parallel heap verification messes up region dump
tonyp
parents:
1019
diff
changeset
|
3070 return _failures; |
|
ff2402f6a50b
6882730: G1: parallel heap verification messes up region dump
tonyp
parents:
1019
diff
changeset
|
3071 } |
|
845
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|
3072 |
| 342 | 3073 bool doHeapRegion(HeapRegion* r) { |
| 390 | 3074 guarantee(_par || r->claim_value() == HeapRegion::InitialClaimValue, |
| 3075 "Should be unclaimed at verify points."); | |
|
637
25e146966e7c
6817419: G1: Enable extensive verification for humongous regions
iveresov
parents:
636
diff
changeset
|
3076 if (!r->continuesHumongous()) { |
|
1020
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1019
diff
changeset
|
3077 bool failures = false; |
| 6008 | 3078 r->verify(_vo, &failures); |
|
1020
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1019
diff
changeset
|
3079 if (failures) { |
|
ff2402f6a50b
6882730: G1: parallel heap verification messes up region dump
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1019
diff
changeset
|
3080 _failures = true; |
|
ff2402f6a50b
6882730: G1: parallel heap verification messes up region dump
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diff
changeset
|
3081 } else { |
|
3772
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diff
changeset
|
3082 VerifyObjsInRegionClosure not_dead_yet_cl(r, _vo); |
|
1020
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diff
changeset
|
3083 r->object_iterate(¬_dead_yet_cl); |
|
4787
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diff
changeset
|
3084 if (_vo != VerifyOption_G1UseNextMarking) { |
|
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
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4785
diff
changeset
|
3085 if (r->max_live_bytes() < not_dead_yet_cl.live_bytes()) { |
|
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
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4785
diff
changeset
|
3086 gclog_or_tty->print_cr("["PTR_FORMAT","PTR_FORMAT"] " |
|
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
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4785
diff
changeset
|
3087 "max_live_bytes "SIZE_FORMAT" " |
|
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
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4785
diff
changeset
|
3088 "< calculated "SIZE_FORMAT, |
|
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
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diff
changeset
|
3089 r->bottom(), r->end(), |
|
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
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diff
changeset
|
3090 r->max_live_bytes(), |
|
1020
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diff
changeset
|
3091 not_dead_yet_cl.live_bytes()); |
|
4787
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4785
diff
changeset
|
3092 _failures = true; |
|
2ace1c4ee8da
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4785
diff
changeset
|
3093 } |
|
2ace1c4ee8da
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4785
diff
changeset
|
3094 } else { |
|
2ace1c4ee8da
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4785
diff
changeset
|
3095 // When vo == UseNextMarking we cannot currently do a sanity |
|
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
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diff
changeset
|
3096 // check on the live bytes as the calculation has not been |
|
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
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diff
changeset
|
3097 // finalized yet. |
|
1020
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diff
changeset
|
3098 } |
|
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changeset
|
3099 } |
| 342 | 3100 } |
|
1020
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diff
changeset
|
3101 return false; // stop the region iteration if we hit a failure |
| 342 | 3102 } |
| 3103 }; | |
| 3104 | |
| 3105 class VerifyRootsClosure: public OopsInGenClosure { | |
| 3106 private: | |
| 3107 G1CollectedHeap* _g1h; | |
|
3772
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changeset
|
3108 VerifyOption _vo; |
| 342 | 3109 bool _failures; |
| 3110 public: | |
|
3772
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changeset
|
3111 // _vo == UsePrevMarking -> use "prev" marking information, |
|
6747fd0512e0
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diff
changeset
|
3112 // _vo == UseNextMarking -> use "next" marking information, |
|
6747fd0512e0
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3766
diff
changeset
|
3113 // _vo == UseMarkWord -> use mark word from object header. |
|
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|
3114 VerifyRootsClosure(VerifyOption vo) : |
|
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3115 _g1h(G1CollectedHeap::heap()), |
|
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|
3116 _vo(vo), |
|
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|
3117 _failures(false) { } |
| 342 | 3118 |
| 3119 bool failures() { return _failures; } | |
| 3120 | |
|
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|
3121 template <class T> void do_oop_nv(T* p) { |
|
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|
3122 T heap_oop = oopDesc::load_heap_oop(p); |
|
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|
3123 if (!oopDesc::is_null(heap_oop)) { |
|
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|
3124 oop obj = oopDesc::decode_heap_oop_not_null(heap_oop); |
|
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|
3125 if (_g1h->is_obj_dead_cond(obj, _vo)) { |
| 342 | 3126 gclog_or_tty->print_cr("Root location "PTR_FORMAT" " |
|
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|
3127 "points to dead obj "PTR_FORMAT, p, (void*) obj); |
|
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|
3128 if (_vo == VerifyOption_G1UseMarkWord) { |
|
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|
3129 gclog_or_tty->print_cr(" Mark word: "PTR_FORMAT, (void*)(obj->mark())); |
|
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|
3130 } |
| 342 | 3131 obj->print_on(gclog_or_tty); |
| 3132 _failures = true; | |
| 3133 } | |
| 3134 } | |
| 3135 } | |
|
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|
3136 |
|
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|
3137 void do_oop(oop* p) { do_oop_nv(p); } |
|
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|
3138 void do_oop(narrowOop* p) { do_oop_nv(p); } |
| 342 | 3139 }; |
| 3140 | |
| 390 | 3141 // This is the task used for parallel heap verification. |
| 3142 | |
| 3143 class G1ParVerifyTask: public AbstractGangTask { | |
| 3144 private: | |
| 3145 G1CollectedHeap* _g1h; | |
|
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|
3146 VerifyOption _vo; |
|
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|
3147 bool _failures; |
| 390 | 3148 |
| 3149 public: | |
|
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|
3150 // _vo == UsePrevMarking -> use "prev" marking information, |
|
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|
3151 // _vo == UseNextMarking -> use "next" marking information, |
|
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|
3152 // _vo == UseMarkWord -> use mark word from object header. |
| 6008 | 3153 G1ParVerifyTask(G1CollectedHeap* g1h, VerifyOption vo) : |
| 390 | 3154 AbstractGangTask("Parallel verify task"), |
|
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|
3155 _g1h(g1h), |
|
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|
3156 _vo(vo), |
|
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|
3157 _failures(false) { } |
|
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|
3158 |
|
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|
3159 bool failures() { |
|
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|
3160 return _failures; |
|
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|
3161 } |
| 390 | 3162 |
|
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|
3163 void work(uint worker_id) { |
|
637
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|
3164 HandleMark hm; |
| 6008 | 3165 VerifyRegionClosure blk(true, _vo); |
|
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|
3166 _g1h->heap_region_par_iterate_chunked(&blk, worker_id, |
|
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|
3167 _g1h->workers()->active_workers(), |
| 390 | 3168 HeapRegion::ParVerifyClaimValue); |
|
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|
3169 if (blk.failures()) { |
|
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|
3170 _failures = true; |
|
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|
3171 } |
| 390 | 3172 } |
| 3173 }; | |
| 3174 | |
| 6008 | 3175 void G1CollectedHeap::verify(bool silent) { |
| 3176 verify(silent, VerifyOption_G1UsePrevMarking); | |
| 3177 } | |
| 3178 | |
| 3179 void G1CollectedHeap::verify(bool silent, | |
|
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|
3180 VerifyOption vo) { |
| 342 | 3181 if (SafepointSynchronize::is_at_safepoint() || ! UseTLAB) { |
|
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|
3182 if (!silent) { gclog_or_tty->print("Roots (excluding permgen) "); } |
|
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|
3183 VerifyRootsClosure rootsCl(vo); |
|
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|
3184 |
|
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|
3185 assert(Thread::current()->is_VM_thread(), |
|
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|
3186 "Expected to be executed serially by the VM thread at this point"); |
|
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|
3187 |
|
989
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|
3188 CodeBlobToOopClosure blobsCl(&rootsCl, /*do_marking=*/ false); |
|
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|
3189 |
|
3293
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|
3190 // We apply the relevant closures to all the oops in the |
|
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|
3191 // system dictionary, the string table and the code cache. |
|
4910
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|
3192 const int so = SO_AllClasses | SO_Strings | SO_CodeCache; |
|
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|
3193 |
|
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changeset
|
3194 process_strong_roots(true, // activate StrongRootsScope |
|
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|
3195 true, // we set "collecting perm gen" to true, |
|
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|
3196 // so we don't reset the dirty cards in the perm gen. |
|
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|
3197 ScanningOption(so), // roots scanning options |
| 342 | 3198 &rootsCl, |
|
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|
3199 &blobsCl, |
| 342 | 3200 &rootsCl); |
|
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|
3201 |
|
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|
3202 // If we're verifying after the marking phase of a Full GC then we can't |
|
6747fd0512e0
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|
3203 // treat the perm gen as roots into the G1 heap. Some of the objects in |
|
6747fd0512e0
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|
3204 // the perm gen may be dead and hence not marked. If one of these dead |
|
6747fd0512e0
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|
3205 // objects is considered to be a root then we may end up with a false |
|
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|
3206 // "Root location <x> points to dead ob <y>" failure. |
|
6747fd0512e0
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|
3207 if (vo != VerifyOption_G1UseMarkWord) { |
|
6747fd0512e0
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changeset
|
3208 // Since we used "collecting_perm_gen" == true above, we will not have |
|
6747fd0512e0
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changeset
|
3209 // checked the refs from perm into the G1-collected heap. We check those |
|
6747fd0512e0
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changeset
|
3210 // references explicitly below. Whether the relevant cards are dirty |
|
6747fd0512e0
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diff
changeset
|
3211 // is checked further below in the rem set verification. |
|
6747fd0512e0
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changeset
|
3212 if (!silent) { gclog_or_tty->print("Permgen roots "); } |
|
6747fd0512e0
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changeset
|
3213 perm_gen()->oop_iterate(&rootsCl); |
|
6747fd0512e0
7004681: G1: Extend marking verification to Full GCs
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|
3214 } |
|
1020
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changeset
|
3215 bool failures = rootsCl.failures(); |
|
3772
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|
3216 |
|
6747fd0512e0
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changeset
|
3217 if (vo != VerifyOption_G1UseMarkWord) { |
|
6747fd0512e0
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diff
changeset
|
3218 // If we're verifying during a full GC then the region sets |
|
6747fd0512e0
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diff
changeset
|
3219 // will have been torn down at the start of the GC. Therefore |
|
6747fd0512e0
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diff
changeset
|
3220 // verifying the region sets will fail. So we only verify |
|
6747fd0512e0
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diff
changeset
|
3221 // the region sets when not in a full GC. |
|
6747fd0512e0
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diff
changeset
|
3222 if (!silent) { gclog_or_tty->print("HeapRegionSets "); } |
|
6747fd0512e0
7004681: G1: Extend marking verification to Full GCs
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3766
diff
changeset
|
3223 verify_region_sets(); |
|
6747fd0512e0
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diff
changeset
|
3224 } |
|
6747fd0512e0
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diff
changeset
|
3225 |
| 2152 | 3226 if (!silent) { gclog_or_tty->print("HeapRegions "); } |
| 390 | 3227 if (GCParallelVerificationEnabled && ParallelGCThreads > 1) { |
| 3228 assert(check_heap_region_claim_values(HeapRegion::InitialClaimValue), | |
| 3229 "sanity check"); | |
| 3230 | |
| 6008 | 3231 G1ParVerifyTask task(this, vo); |
|
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|
3232 assert(UseDynamicNumberOfGCThreads || |
|
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|
3233 workers()->active_workers() == workers()->total_workers(), |
|
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|
3234 "If not dynamic should be using all the workers"); |
|
bca17e38de00
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changeset
|
3235 int n_workers = workers()->active_workers(); |
| 390 | 3236 set_par_threads(n_workers); |
| 3237 workers()->run_task(&task); | |
| 3238 set_par_threads(0); | |
|
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|
3239 if (task.failures()) { |
|
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|
3240 failures = true; |
|
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|
3241 } |
| 390 | 3242 |
|
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|
3243 // Checks that the expected amount of parallel work was done. |
|
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|
3244 // The implication is that n_workers is > 0. |
| 390 | 3245 assert(check_heap_region_claim_values(HeapRegion::ParVerifyClaimValue), |
| 3246 "sanity check"); | |
| 3247 | |
| 3248 reset_heap_region_claim_values(); | |
| 3249 | |
| 3250 assert(check_heap_region_claim_values(HeapRegion::InitialClaimValue), | |
| 3251 "sanity check"); | |
| 3252 } else { | |
| 6008 | 3253 VerifyRegionClosure blk(false, vo); |
| 3766 | 3254 heap_region_iterate(&blk); |
|
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|
3255 if (blk.failures()) { |
|
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|
3256 failures = true; |
|
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|
3257 } |
| 390 | 3258 } |
| 2152 | 3259 if (!silent) gclog_or_tty->print("RemSet "); |
| 342 | 3260 rem_set()->verify(); |
|
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|
3261 |
|
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|
3262 if (failures) { |
|
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|
3263 gclog_or_tty->print_cr("Heap:"); |
|
4073
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|
3264 // It helps to have the per-region information in the output to |
|
53074c2c4600
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changeset
|
3265 // help us track down what went wrong. This is why we call |
|
53074c2c4600
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|
3266 // print_extended_on() instead of print_on(). |
|
53074c2c4600
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|
3267 print_extended_on(gclog_or_tty); |
|
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|
3268 gclog_or_tty->print_cr(""); |
|
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1545
diff
changeset
|
3269 #ifndef PRODUCT |
| 1044 | 3270 if (VerifyDuringGC && G1VerifyDuringGCPrintReachable) { |
| 1388 | 3271 concurrent_mark()->print_reachable("at-verification-failure", |
|
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|
3272 vo, false /* all */); |
|
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|
3273 } |
|
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changeset
|
3274 #endif |
|
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|
3275 gclog_or_tty->flush(); |
|
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|
3276 } |
|
ff2402f6a50b
6882730: G1: parallel heap verification messes up region dump
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1019
diff
changeset
|
3277 guarantee(!failures, "there should not have been any failures"); |
| 342 | 3278 } else { |
| 3279 if (!silent) gclog_or_tty->print("(SKIPPING roots, heapRegions, remset) "); | |
| 3280 } | |
| 3281 } | |
| 3282 | |
| 3283 class PrintRegionClosure: public HeapRegionClosure { | |
| 3284 outputStream* _st; | |
| 3285 public: | |
| 3286 PrintRegionClosure(outputStream* st) : _st(st) {} | |
| 3287 bool doHeapRegion(HeapRegion* r) { | |
| 3288 r->print_on(_st); | |
| 3289 return false; | |
| 3290 } | |
| 3291 }; | |
| 3292 | |
| 3293 void G1CollectedHeap::print_on(outputStream* st) const { | |
|
838
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
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|
3294 st->print(" %-20s", "garbage-first heap"); |
|
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
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diff
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|
3295 st->print(" total " SIZE_FORMAT "K, used " SIZE_FORMAT "K", |
|
846
42d84bbbecf4
6859911: G1: assert(Heap_lock->owner() = NULL, "Should be owned on this thread's behalf")
tonyp
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diff
changeset
|
3296 capacity()/K, used_unlocked()/K); |
|
838
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
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|
3297 st->print(" [" INTPTR_FORMAT ", " INTPTR_FORMAT ", " INTPTR_FORMAT ")", |
|
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
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|
3298 _g1_storage.low_boundary(), |
|
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
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|
3299 _g1_storage.high(), |
|
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
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|
3300 _g1_storage.high_boundary()); |
|
0316eac49d5a
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diff
changeset
|
3301 st->cr(); |
|
3986
65a8ff39a6da
7095194: G1: HeapRegion::GrainBytes, GrainWords, and CardsPerRegion should be size_t
johnc
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3983
diff
changeset
|
3302 st->print(" region size " SIZE_FORMAT "K, ", HeapRegion::GrainBytes / K); |
|
6010
720b6a76dd9d
7157073: G1: type change size_t -> uint for region counts / indexes
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diff
changeset
|
3303 uint young_regions = _young_list->length(); |
|
720b6a76dd9d
7157073: G1: type change size_t -> uint for region counts / indexes
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diff
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|
3304 st->print("%u young (" SIZE_FORMAT "K), ", young_regions, |
|
720b6a76dd9d
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changeset
|
3305 (size_t) young_regions * HeapRegion::GrainBytes / K); |
|
720b6a76dd9d
7157073: G1: type change size_t -> uint for region counts / indexes
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diff
changeset
|
3306 uint survivor_regions = g1_policy()->recorded_survivor_regions(); |
|
720b6a76dd9d
7157073: G1: type change size_t -> uint for region counts / indexes
tonyp
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diff
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|
3307 st->print("%u survivors (" SIZE_FORMAT "K)", survivor_regions, |
|
720b6a76dd9d
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diff
changeset
|
3308 (size_t) survivor_regions * HeapRegion::GrainBytes / K); |
|
838
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
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|
3309 st->cr(); |
|
0316eac49d5a
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|
3310 perm()->as_gen()->print_on(st); |
|
4073
53074c2c4600
7099849: G1: include heap region information in hs_err files
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|
3311 } |
|
53074c2c4600
7099849: G1: include heap region information in hs_err files
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|
3312 |
|
53074c2c4600
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|
3313 void G1CollectedHeap::print_extended_on(outputStream* st) const { |
|
53074c2c4600
7099849: G1: include heap region information in hs_err files
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|
3314 print_on(st); |
|
53074c2c4600
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|
3315 |
|
53074c2c4600
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|
3316 // Print the per-region information. |
|
53074c2c4600
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|
3317 st->cr(); |
|
6010
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|
3318 st->print_cr("Heap Regions: (Y=young(eden), SU=young(survivor), " |
|
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|
3319 "HS=humongous(starts), HC=humongous(continues), " |
|
720b6a76dd9d
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|
3320 "CS=collection set, F=free, TS=gc time stamp, " |
|
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|
3321 "PTAMS=previous top-at-mark-start, " |
|
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|
3322 "NTAMS=next top-at-mark-start)"); |
| 342 | 3323 PrintRegionClosure blk(st); |
| 3766 | 3324 heap_region_iterate(&blk); |
| 342 | 3325 } |
| 3326 | |
| 3327 void G1CollectedHeap::print_gc_threads_on(outputStream* st) const { | |
|
1833
8b10f48633dc
6984287: Regularize how GC parallel workers are specified.
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diff
changeset
|
3328 if (G1CollectedHeap::use_parallel_gc_threads()) { |
| 1019 | 3329 workers()->print_worker_threads_on(st); |
| 3330 } | |
| 3331 _cmThread->print_on(st); | |
| 342 | 3332 st->cr(); |
| 1019 | 3333 _cm->print_worker_threads_on(st); |
| 3334 _cg1r->print_worker_threads_on(st); | |
| 342 | 3335 st->cr(); |
| 3336 } | |
| 3337 | |
| 3338 void G1CollectedHeap::gc_threads_do(ThreadClosure* tc) const { | |
|
1833
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diff
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|
3339 if (G1CollectedHeap::use_parallel_gc_threads()) { |
| 342 | 3340 workers()->threads_do(tc); |
| 3341 } | |
| 3342 tc->do_thread(_cmThread); | |
| 794 | 3343 _cg1r->threads_do(tc); |
| 342 | 3344 } |
| 3345 | |
| 3346 void G1CollectedHeap::print_tracing_info() const { | |
| 3347 // We'll overload this to mean "trace GC pause statistics." | |
| 3348 if (TraceGen0Time || TraceGen1Time) { | |
| 3349 // The "G1CollectorPolicy" is keeping track of these stats, so delegate | |
| 3350 // to that. | |
| 3351 g1_policy()->print_tracing_info(); | |
| 3352 } | |
| 751 | 3353 if (G1SummarizeRSetStats) { |
| 342 | 3354 g1_rem_set()->print_summary_info(); |
| 3355 } | |
| 1282 | 3356 if (G1SummarizeConcMark) { |
| 342 | 3357 concurrent_mark()->print_summary_info(); |
| 3358 } | |
| 3359 g1_policy()->print_yg_surv_rate_info(); | |
| 3360 SpecializationStats::print(); | |
| 3361 } | |
| 3362 | |
|
3777
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|
3363 #ifndef PRODUCT |
|
e8b0b0392037
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|
3364 // Helpful for debugging RSet issues. |
|
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|
3365 |
|
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|
3366 class PrintRSetsClosure : public HeapRegionClosure { |
|
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|
3367 private: |
|
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|
3368 const char* _msg; |
|
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|
3369 size_t _occupied_sum; |
|
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|
3370 |
|
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changeset
|
3371 public: |
|
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|
3372 bool doHeapRegion(HeapRegion* r) { |
|
e8b0b0392037
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|
3373 HeapRegionRemSet* hrrs = r->rem_set(); |
|
e8b0b0392037
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diff
changeset
|
3374 size_t occupied = hrrs->occupied(); |
|
e8b0b0392037
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parents:
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diff
changeset
|
3375 _occupied_sum += occupied; |
|
e8b0b0392037
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changeset
|
3376 |
|
e8b0b0392037
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changeset
|
3377 gclog_or_tty->print_cr("Printing RSet for region "HR_FORMAT, |
|
e8b0b0392037
7046182: G1: remove unnecessary iterations over the collection set
tonyp
parents:
3774
diff
changeset
|
3378 HR_FORMAT_PARAMS(r)); |
|
e8b0b0392037
7046182: G1: remove unnecessary iterations over the collection set
tonyp
parents:
3774
diff
changeset
|
3379 if (occupied == 0) { |
|
e8b0b0392037
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tonyp
parents:
3774
diff
changeset
|
3380 gclog_or_tty->print_cr(" RSet is empty"); |
|
e8b0b0392037
7046182: G1: remove unnecessary iterations over the collection set
tonyp
parents:
3774
diff
changeset
|
3381 } else { |
|
e8b0b0392037
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tonyp
parents:
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diff
changeset
|
3382 hrrs->print(); |
|
e8b0b0392037
7046182: G1: remove unnecessary iterations over the collection set
tonyp
parents:
3774
diff
changeset
|
3383 } |
|
e8b0b0392037
7046182: G1: remove unnecessary iterations over the collection set
tonyp
parents:
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diff
changeset
|
3384 gclog_or_tty->print_cr("----------"); |
|
e8b0b0392037
7046182: G1: remove unnecessary iterations over the collection set
tonyp
parents:
3774
diff
changeset
|
3385 return false; |
|
e8b0b0392037
7046182: G1: remove unnecessary iterations over the collection set
tonyp
parents:
3774
diff
changeset
|
3386 } |
|
e8b0b0392037
7046182: G1: remove unnecessary iterations over the collection set
tonyp
parents:
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diff
changeset
|
3387 |
|
e8b0b0392037
7046182: G1: remove unnecessary iterations over the collection set
tonyp
parents:
3774
diff
changeset
|
3388 PrintRSetsClosure(const char* msg) : _msg(msg), _occupied_sum(0) { |
|
e8b0b0392037
7046182: G1: remove unnecessary iterations over the collection set
tonyp
parents:
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diff
changeset
|
3389 gclog_or_tty->cr(); |
|
e8b0b0392037
7046182: G1: remove unnecessary iterations over the collection set
tonyp
parents:
3774
diff
changeset
|
3390 gclog_or_tty->print_cr("========================================"); |
|
e8b0b0392037
7046182: G1: remove unnecessary iterations over the collection set
tonyp
parents:
3774
diff
changeset
|
3391 gclog_or_tty->print_cr(msg); |
|
e8b0b0392037
7046182: G1: remove unnecessary iterations over the collection set
tonyp
parents:
3774
diff
changeset
|
3392 gclog_or_tty->cr(); |
|
e8b0b0392037
7046182: G1: remove unnecessary iterations over the collection set
tonyp
parents:
3774
diff
changeset
|
3393 } |
|
e8b0b0392037
7046182: G1: remove unnecessary iterations over the collection set
tonyp
parents:
3774
diff
changeset
|
3394 |
|
e8b0b0392037
7046182: G1: remove unnecessary iterations over the collection set
tonyp
parents:
3774
diff
changeset
|
3395 ~PrintRSetsClosure() { |
|
e8b0b0392037
7046182: G1: remove unnecessary iterations over the collection set
tonyp
parents:
3774
diff
changeset
|
3396 gclog_or_tty->print_cr("Occupied Sum: "SIZE_FORMAT, _occupied_sum); |
|
e8b0b0392037
7046182: G1: remove unnecessary iterations over the collection set
tonyp
parents:
3774
diff
changeset
|
3397 gclog_or_tty->print_cr("========================================"); |
|
e8b0b0392037
7046182: G1: remove unnecessary iterations over the collection set
tonyp
parents:
3774
diff
changeset
|
3398 gclog_or_tty->cr(); |
|
e8b0b0392037
7046182: G1: remove unnecessary iterations over the collection set
tonyp
parents:
3774
diff
changeset
|
3399 } |
|
e8b0b0392037
7046182: G1: remove unnecessary iterations over the collection set
tonyp
parents:
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diff
changeset
|
3400 }; |
|
e8b0b0392037
7046182: G1: remove unnecessary iterations over the collection set
tonyp
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diff
changeset
|
3401 |
|
e8b0b0392037
7046182: G1: remove unnecessary iterations over the collection set
tonyp
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diff
changeset
|
3402 void G1CollectedHeap::print_cset_rsets() { |
|
e8b0b0392037
7046182: G1: remove unnecessary iterations over the collection set
tonyp
parents:
3774
diff
changeset
|
3403 PrintRSetsClosure cl("Printing CSet RSets"); |
|
e8b0b0392037
7046182: G1: remove unnecessary iterations over the collection set
tonyp
parents:
3774
diff
changeset
|
3404 collection_set_iterate(&cl); |
|
e8b0b0392037
7046182: G1: remove unnecessary iterations over the collection set
tonyp
parents:
3774
diff
changeset
|
3405 } |
|
e8b0b0392037
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diff
changeset
|
3406 |
|
e8b0b0392037
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diff
changeset
|
3407 void G1CollectedHeap::print_all_rsets() { |
|
e8b0b0392037
7046182: G1: remove unnecessary iterations over the collection set
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3774
diff
changeset
|
3408 PrintRSetsClosure cl("Printing All RSets");; |
|
e8b0b0392037
7046182: G1: remove unnecessary iterations over the collection set
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parents:
3774
diff
changeset
|
3409 heap_region_iterate(&cl); |
|
e8b0b0392037
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parents:
3774
diff
changeset
|
3410 } |
|
e8b0b0392037
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diff
changeset
|
3411 #endif // PRODUCT |
|
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|
3412 |
| 342 | 3413 G1CollectedHeap* G1CollectedHeap::heap() { |
| 3414 assert(_sh->kind() == CollectedHeap::G1CollectedHeap, | |
| 3415 "not a garbage-first heap"); | |
| 3416 return _g1h; | |
| 3417 } | |
| 3418 | |
| 3419 void G1CollectedHeap::gc_prologue(bool full /* Ignored */) { | |
|
1245
6484c4ee11cb
6904516: More object array barrier fixes, following up on 6906727
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1166
diff
changeset
|
3420 // always_do_update_barrier = false; |
| 342 | 3421 assert(InlineCacheBuffer::is_empty(), "should have cleaned up ICBuffer"); |
| 3422 // Call allocation profiler | |
| 3423 AllocationProfiler::iterate_since_last_gc(); | |
| 3424 // Fill TLAB's and such | |
| 3425 ensure_parsability(true); | |
| 3426 } | |
| 3427 | |
| 3428 void G1CollectedHeap::gc_epilogue(bool full /* Ignored */) { | |
| 3429 // FIXME: what is this about? | |
| 3430 // I'm ignoring the "fill_newgen()" call if "alloc_event_enabled" | |
| 3431 // is set. | |
| 3432 COMPILER2_PRESENT(assert(DerivedPointerTable::is_empty(), | |
| 3433 "derived pointer present")); | |
|
1245
6484c4ee11cb
6904516: More object array barrier fixes, following up on 6906727
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parents:
1166
diff
changeset
|
3434 // always_do_update_barrier = true; |
|
3979
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3435 |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3436 // We have just completed a GC. Update the soft reference |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3437 // policy with the new heap occupancy |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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parents:
3973
diff
changeset
|
3438 Universe::update_heap_info_at_gc(); |
| 342 | 3439 } |
| 3440 | |
| 1973 | 3441 HeapWord* G1CollectedHeap::do_collection_pause(size_t word_size, |
| 3442 unsigned int gc_count_before, | |
| 3443 bool* succeeded) { | |
| 3444 assert_heap_not_locked_and_not_at_safepoint(); | |
| 342 | 3445 g1_policy()->record_stop_world_start(); |
| 1973 | 3446 VM_G1IncCollectionPause op(gc_count_before, |
| 3447 word_size, | |
| 3448 false, /* should_initiate_conc_mark */ | |
| 3449 g1_policy()->max_pause_time_ms(), | |
| 3450 GCCause::_g1_inc_collection_pause); | |
| 3451 VMThread::execute(&op); | |
| 3452 | |
| 3453 HeapWord* result = op.result(); | |
| 3454 bool ret_succeeded = op.prologue_succeeded() && op.pause_succeeded(); | |
| 3455 assert(result == NULL || ret_succeeded, | |
| 3456 "the result should be NULL if the VM did not succeed"); | |
| 3457 *succeeded = ret_succeeded; | |
| 3458 | |
| 3459 assert_heap_not_locked(); | |
| 3460 return result; | |
| 342 | 3461 } |
| 3462 | |
| 3463 void | |
| 3464 G1CollectedHeap::doConcurrentMark() { | |
|
845
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6700789: G1: Enable use of compressed oops with G1 heaps
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838
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|
3465 MutexLockerEx x(CGC_lock, Mutex::_no_safepoint_check_flag); |
|
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
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838
diff
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|
3466 if (!_cmThread->in_progress()) { |
|
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
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838
diff
changeset
|
3467 _cmThread->set_started(); |
|
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6700789: G1: Enable use of compressed oops with G1 heaps
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diff
changeset
|
3468 CGC_lock->notify(); |
| 342 | 3469 } |
| 3470 } | |
| 3471 | |
| 3472 size_t G1CollectedHeap::pending_card_num() { | |
| 3473 size_t extra_cards = 0; | |
| 3474 JavaThread *curr = Threads::first(); | |
| 3475 while (curr != NULL) { | |
| 3476 DirtyCardQueue& dcq = curr->dirty_card_queue(); | |
| 3477 extra_cards += dcq.size(); | |
| 3478 curr = curr->next(); | |
| 3479 } | |
| 3480 DirtyCardQueueSet& dcqs = JavaThread::dirty_card_queue_set(); | |
| 3481 size_t buffer_size = dcqs.buffer_size(); | |
| 3482 size_t buffer_num = dcqs.completed_buffers_num(); | |
| 3483 return buffer_size * buffer_num + extra_cards; | |
| 3484 } | |
| 3485 | |
| 3486 size_t G1CollectedHeap::max_pending_card_num() { | |
| 3487 DirtyCardQueueSet& dcqs = JavaThread::dirty_card_queue_set(); | |
| 3488 size_t buffer_size = dcqs.buffer_size(); | |
| 3489 size_t buffer_num = dcqs.completed_buffers_num(); | |
| 3490 int thread_num = Threads::number_of_threads(); | |
| 3491 return (buffer_num + thread_num) * buffer_size; | |
| 3492 } | |
| 3493 | |
| 3494 size_t G1CollectedHeap::cards_scanned() { | |
| 1861 | 3495 return g1_rem_set()->cardsScanned(); |
| 342 | 3496 } |
| 3497 | |
| 3498 void | |
| 3499 G1CollectedHeap::setup_surviving_young_words() { | |
|
6010
720b6a76dd9d
7157073: G1: type change size_t -> uint for region counts / indexes
tonyp
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6008
diff
changeset
|
3500 assert(_surviving_young_words == NULL, "pre-condition"); |
|
720b6a76dd9d
7157073: G1: type change size_t -> uint for region counts / indexes
tonyp
parents:
6008
diff
changeset
|
3501 uint array_length = g1_policy()->young_cset_region_length(); |
|
720b6a76dd9d
7157073: G1: type change size_t -> uint for region counts / indexes
tonyp
parents:
6008
diff
changeset
|
3502 _surviving_young_words = NEW_C_HEAP_ARRAY(size_t, (size_t) array_length); |
| 342 | 3503 if (_surviving_young_words == NULL) { |
| 3504 vm_exit_out_of_memory(sizeof(size_t) * array_length, | |
| 3505 "Not enough space for young surv words summary."); | |
| 3506 } | |
|
6010
720b6a76dd9d
7157073: G1: type change size_t -> uint for region counts / indexes
tonyp
parents:
6008
diff
changeset
|
3507 memset(_surviving_young_words, 0, (size_t) array_length * sizeof(size_t)); |
|
845
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
ysr
parents:
838
diff
changeset
|
3508 #ifdef ASSERT |
|
6010
720b6a76dd9d
7157073: G1: type change size_t -> uint for region counts / indexes
tonyp
parents:
6008
diff
changeset
|
3509 for (uint i = 0; i < array_length; ++i) { |
|
845
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
ysr
parents:
838
diff
changeset
|
3510 assert( _surviving_young_words[i] == 0, "memset above" ); |
|
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
ysr
parents:
838
diff
changeset
|
3511 } |
|
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
ysr
parents:
838
diff
changeset
|
3512 #endif // !ASSERT |
| 342 | 3513 } |
| 3514 | |
| 3515 void | |
| 3516 G1CollectedHeap::update_surviving_young_words(size_t* surv_young_words) { | |
| 3517 MutexLockerEx x(ParGCRareEvent_lock, Mutex::_no_safepoint_check_flag); | |
|
6010
720b6a76dd9d
7157073: G1: type change size_t -> uint for region counts / indexes
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parents:
6008
diff
changeset
|
3518 uint array_length = g1_policy()->young_cset_region_length(); |
|
720b6a76dd9d
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tonyp
parents:
6008
diff
changeset
|
3519 for (uint i = 0; i < array_length; ++i) { |
| 342 | 3520 _surviving_young_words[i] += surv_young_words[i]; |
|
6010
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6008
diff
changeset
|
3521 } |
| 342 | 3522 } |
| 3523 | |
| 3524 void | |
| 3525 G1CollectedHeap::cleanup_surviving_young_words() { | |
| 3526 guarantee( _surviving_young_words != NULL, "pre-condition" ); | |
| 3527 FREE_C_HEAP_ARRAY(size_t, _surviving_young_words); | |
| 3528 _surviving_young_words = NULL; | |
| 3529 } | |
| 3530 | |
|
3777
e8b0b0392037
7046182: G1: remove unnecessary iterations over the collection set
tonyp
parents:
3774
diff
changeset
|
3531 #ifdef ASSERT |
|
e8b0b0392037
7046182: G1: remove unnecessary iterations over the collection set
tonyp
parents:
3774
diff
changeset
|
3532 class VerifyCSetClosure: public HeapRegionClosure { |
|
e8b0b0392037
7046182: G1: remove unnecessary iterations over the collection set
tonyp
parents:
3774
diff
changeset
|
3533 public: |
|
e8b0b0392037
7046182: G1: remove unnecessary iterations over the collection set
tonyp
parents:
3774
diff
changeset
|
3534 bool doHeapRegion(HeapRegion* hr) { |
|
e8b0b0392037
7046182: G1: remove unnecessary iterations over the collection set
tonyp
parents:
3774
diff
changeset
|
3535 // Here we check that the CSet region's RSet is ready for parallel |
|
e8b0b0392037
7046182: G1: remove unnecessary iterations over the collection set
tonyp
parents:
3774
diff
changeset
|
3536 // iteration. The fields that we'll verify are only manipulated |
|
e8b0b0392037
7046182: G1: remove unnecessary iterations over the collection set
tonyp
parents:
3774
diff
changeset
|
3537 // when the region is part of a CSet and is collected. Afterwards, |
|
e8b0b0392037
7046182: G1: remove unnecessary iterations over the collection set
tonyp
parents:
3774
diff
changeset
|
3538 // we reset these fields when we clear the region's RSet (when the |
|
e8b0b0392037
7046182: G1: remove unnecessary iterations over the collection set
tonyp
parents:
3774
diff
changeset
|
3539 // region is freed) so they are ready when the region is |
|
e8b0b0392037
7046182: G1: remove unnecessary iterations over the collection set
tonyp
parents:
3774
diff
changeset
|
3540 // re-allocated. The only exception to this is if there's an |
|
e8b0b0392037
7046182: G1: remove unnecessary iterations over the collection set
tonyp
parents:
3774
diff
changeset
|
3541 // evacuation failure and instead of freeing the region we leave |
|
e8b0b0392037
7046182: G1: remove unnecessary iterations over the collection set
tonyp
parents:
3774
diff
changeset
|
3542 // it in the heap. In that case, we reset these fields during |
|
e8b0b0392037
7046182: G1: remove unnecessary iterations over the collection set
tonyp
parents:
3774
diff
changeset
|
3543 // evacuation failure handling. |
|
e8b0b0392037
7046182: G1: remove unnecessary iterations over the collection set
tonyp
parents:
3774
diff
changeset
|
3544 guarantee(hr->rem_set()->verify_ready_for_par_iteration(), "verification"); |
|
e8b0b0392037
7046182: G1: remove unnecessary iterations over the collection set
tonyp
parents:
3774
diff
changeset
|
3545 |
|
e8b0b0392037
7046182: G1: remove unnecessary iterations over the collection set
tonyp
parents:
3774
diff
changeset
|
3546 // Here's a good place to add any other checks we'd like to |
|
e8b0b0392037
7046182: G1: remove unnecessary iterations over the collection set
tonyp
parents:
3774
diff
changeset
|
3547 // perform on CSet regions. |
|
1261
0414c1049f15
6923991: G1: improve scalability of RSet scanning
iveresov
parents:
1245
diff
changeset
|
3548 return false; |
|
0414c1049f15
6923991: G1: improve scalability of RSet scanning
iveresov
parents:
1245
diff
changeset
|
3549 } |
|
0414c1049f15
6923991: G1: improve scalability of RSet scanning
iveresov
parents:
1245
diff
changeset
|
3550 }; |
|
3777
e8b0b0392037
7046182: G1: remove unnecessary iterations over the collection set
tonyp
parents:
3774
diff
changeset
|
3551 #endif // ASSERT |
|
1261
0414c1049f15
6923991: G1: improve scalability of RSet scanning
iveresov
parents:
1245
diff
changeset
|
3552 |
| 1709 | 3553 #if TASKQUEUE_STATS |
| 3554 void G1CollectedHeap::print_taskqueue_stats_hdr(outputStream* const st) { | |
| 3555 st->print_raw_cr("GC Task Stats"); | |
| 3556 st->print_raw("thr "); TaskQueueStats::print_header(1, st); st->cr(); | |
| 3557 st->print_raw("--- "); TaskQueueStats::print_header(2, st); st->cr(); | |
| 3558 } | |
| 3559 | |
| 3560 void G1CollectedHeap::print_taskqueue_stats(outputStream* const st) const { | |
| 3561 print_taskqueue_stats_hdr(st); | |
| 3562 | |
| 3563 TaskQueueStats totals; | |
|
1755
8e5955ddf8e4
6978300: G1: debug builds crash if ParallelGCThreads==0
jcoomes
parents:
1719
diff
changeset
|
3564 const int n = workers() != NULL ? workers()->total_workers() : 1; |
| 1709 | 3565 for (int i = 0; i < n; ++i) { |
| 3566 st->print("%3d ", i); task_queue(i)->stats.print(st); st->cr(); | |
| 3567 totals += task_queue(i)->stats; | |
| 3568 } | |
| 3569 st->print_raw("tot "); totals.print(st); st->cr(); | |
| 3570 | |
| 3571 DEBUG_ONLY(totals.verify()); | |
| 3572 } | |
| 3573 | |
| 3574 void G1CollectedHeap::reset_taskqueue_stats() { | |
|
1755
8e5955ddf8e4
6978300: G1: debug builds crash if ParallelGCThreads==0
jcoomes
parents:
1719
diff
changeset
|
3575 const int n = workers() != NULL ? workers()->total_workers() : 1; |
| 1709 | 3576 for (int i = 0; i < n; ++i) { |
| 3577 task_queue(i)->stats.reset(); | |
| 3578 } | |
| 3579 } | |
| 3580 #endif // TASKQUEUE_STATS | |
| 3581 | |
| 1973 | 3582 bool |
|
1656
4e5661ba9d98
6944166: G1: explicit GCs are not always handled correctly
tonyp
parents:
1611
diff
changeset
|
3583 G1CollectedHeap::do_collection_pause_at_safepoint(double target_pause_time_ms) { |
| 2152 | 3584 assert_at_safepoint(true /* should_be_vm_thread */); |
| 3585 guarantee(!is_gc_active(), "collection is not reentrant"); | |
| 3586 | |
|
1359
23b1b27ac76c
6909756: G1: guarantee(G1CollectedHeap::heap()->mark_in_progress(),"Precondition.")
tonyp
parents:
1313
diff
changeset
|
3587 if (GC_locker::check_active_before_gc()) { |
| 1973 | 3588 return false; |
|
1359
23b1b27ac76c
6909756: G1: guarantee(G1CollectedHeap::heap()->mark_in_progress(),"Precondition.")
tonyp
parents:
1313
diff
changeset
|
3589 } |
|
23b1b27ac76c
6909756: G1: guarantee(G1CollectedHeap::heap()->mark_in_progress(),"Precondition.")
tonyp
parents:
1313
diff
changeset
|
3590 |
|
2125
7246a374a9f2
6458402: 3 jvmti tests fail with CMS and +ExplicitGCInvokesConcurrent
kamg
parents:
2039
diff
changeset
|
3591 SvcGCMarker sgcm(SvcGCMarker::MINOR); |
|
2039
7c5250dbd584
6896624: G1: hotspot:::gc and hotspot:::mem-pool-gc probes are not fired
tonyp
parents:
2038
diff
changeset
|
3592 ResourceMark rm; |
|
7c5250dbd584
6896624: G1: hotspot:::gc and hotspot:::mem-pool-gc probes are not fired
tonyp
parents:
2038
diff
changeset
|
3593 |
|
4872
aa3d708d67c4
7141200: log some interesting information in ring buffers for crashes
never
parents:
4787
diff
changeset
|
3594 print_heap_before_gc(); |
|
838
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
parents:
811
diff
changeset
|
3595 |
| 4072 | 3596 HRSPhaseSetter x(HRSPhaseEvacuation); |
| 2152 | 3597 verify_region_sets_optional(); |
|
2433
abdfc822206f
7023069: G1: Introduce symmetric locking in the slow allocation path
tonyp
parents:
2432
diff
changeset
|
3598 verify_dirty_young_regions(); |
| 2152 | 3599 |
|
4831
7ca7be5a6a0b
7129271: G1: Interference from multiple threads in PrintGC/PrintGCDetails output
johnc
parents:
4829
diff
changeset
|
3600 // This call will decide whether this pause is an initial-mark |
|
7ca7be5a6a0b
7129271: G1: Interference from multiple threads in PrintGC/PrintGCDetails output
johnc
parents:
4829
diff
changeset
|
3601 // pause. If it is, during_initial_mark_pause() will return true |
|
7ca7be5a6a0b
7129271: G1: Interference from multiple threads in PrintGC/PrintGCDetails output
johnc
parents:
4829
diff
changeset
|
3602 // for the duration of this pause. |
|
7ca7be5a6a0b
7129271: G1: Interference from multiple threads in PrintGC/PrintGCDetails output
johnc
parents:
4829
diff
changeset
|
3603 g1_policy()->decide_on_conc_mark_initiation(); |
|
7ca7be5a6a0b
7129271: G1: Interference from multiple threads in PrintGC/PrintGCDetails output
johnc
parents:
4829
diff
changeset
|
3604 |
|
7ca7be5a6a0b
7129271: G1: Interference from multiple threads in PrintGC/PrintGCDetails output
johnc
parents:
4829
diff
changeset
|
3605 // We do not allow initial-mark to be piggy-backed on a mixed GC. |
|
7ca7be5a6a0b
7129271: G1: Interference from multiple threads in PrintGC/PrintGCDetails output
johnc
parents:
4829
diff
changeset
|
3606 assert(!g1_policy()->during_initial_mark_pause() || |
|
7ca7be5a6a0b
7129271: G1: Interference from multiple threads in PrintGC/PrintGCDetails output
johnc
parents:
4829
diff
changeset
|
3607 g1_policy()->gcs_are_young(), "sanity"); |
|
7ca7be5a6a0b
7129271: G1: Interference from multiple threads in PrintGC/PrintGCDetails output
johnc
parents:
4829
diff
changeset
|
3608 |
|
7ca7be5a6a0b
7129271: G1: Interference from multiple threads in PrintGC/PrintGCDetails output
johnc
parents:
4829
diff
changeset
|
3609 // We also do not allow mixed GCs during marking. |
|
7ca7be5a6a0b
7129271: G1: Interference from multiple threads in PrintGC/PrintGCDetails output
johnc
parents:
4829
diff
changeset
|
3610 assert(!mark_in_progress() || g1_policy()->gcs_are_young(), "sanity"); |
|
7ca7be5a6a0b
7129271: G1: Interference from multiple threads in PrintGC/PrintGCDetails output
johnc
parents:
4829
diff
changeset
|
3611 |
|
7ca7be5a6a0b
7129271: G1: Interference from multiple threads in PrintGC/PrintGCDetails output
johnc
parents:
4829
diff
changeset
|
3612 // Record whether this pause is an initial mark. When the current |
|
7ca7be5a6a0b
7129271: G1: Interference from multiple threads in PrintGC/PrintGCDetails output
johnc
parents:
4829
diff
changeset
|
3613 // thread has completed its logging output and it's safe to signal |
|
7ca7be5a6a0b
7129271: G1: Interference from multiple threads in PrintGC/PrintGCDetails output
johnc
parents:
4829
diff
changeset
|
3614 // the CM thread, the flag's value in the policy has been reset. |
|
7ca7be5a6a0b
7129271: G1: Interference from multiple threads in PrintGC/PrintGCDetails output
johnc
parents:
4829
diff
changeset
|
3615 bool should_start_conc_mark = g1_policy()->during_initial_mark_pause(); |
|
7ca7be5a6a0b
7129271: G1: Interference from multiple threads in PrintGC/PrintGCDetails output
johnc
parents:
4829
diff
changeset
|
3616 |
|
7ca7be5a6a0b
7129271: G1: Interference from multiple threads in PrintGC/PrintGCDetails output
johnc
parents:
4829
diff
changeset
|
3617 // Inner scope for scope based logging, timers, and stats collection |
|
838
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
parents:
811
diff
changeset
|
3618 { |
|
1656
4e5661ba9d98
6944166: G1: explicit GCs are not always handled correctly
tonyp
parents:
1611
diff
changeset
|
3619 if (g1_policy()->during_initial_mark_pause()) { |
|
4e5661ba9d98
6944166: G1: explicit GCs are not always handled correctly
tonyp
parents:
1611
diff
changeset
|
3620 // We are about to start a marking cycle, so we increment the |
|
4e5661ba9d98
6944166: G1: explicit GCs are not always handled correctly
tonyp
parents:
1611
diff
changeset
|
3621 // full collection counter. |
|
6120
37552638d24a
7172388: G1: _total_full_collections should not be incremented for concurrent cycles
brutisso
parents:
6109
diff
changeset
|
3622 increment_old_marking_cycles_started(); |
|
1656
4e5661ba9d98
6944166: G1: explicit GCs are not always handled correctly
tonyp
parents:
1611
diff
changeset
|
3623 } |
|
6007
5c86f8211d1e
7160728: Introduce an extra logging level for G1 logging
brutisso
parents:
5987
diff
changeset
|
3624 // if the log level is "finer" is on, we'll print long statistics information |
|
838
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
parents:
811
diff
changeset
|
3625 // in the collector policy code, so let's not print this as the output |
|
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
parents:
811
diff
changeset
|
3626 // is messy if we do. |
|
6007
5c86f8211d1e
7160728: Introduce an extra logging level for G1 logging
brutisso
parents:
5987
diff
changeset
|
3627 gclog_or_tty->date_stamp(G1Log::fine() && PrintGCDateStamps); |
|
5c86f8211d1e
7160728: Introduce an extra logging level for G1 logging
brutisso
parents:
5987
diff
changeset
|
3628 TraceCPUTime tcpu(G1Log::finer(), true, gclog_or_tty); |
| 6030 | 3629 |
|
6064
9d679effd28c
7166894: Add gc cause to GC logging for all collectors
brutisso
parents:
6059
diff
changeset
|
3630 GCCauseString gc_cause_str = GCCauseString("GC pause", gc_cause()) |
|
9d679effd28c
7166894: Add gc cause to GC logging for all collectors
brutisso
parents:
6059
diff
changeset
|
3631 .append(g1_policy()->gcs_are_young() ? " (young)" : " (mixed)") |
|
9d679effd28c
7166894: Add gc cause to GC logging for all collectors
brutisso
parents:
6059
diff
changeset
|
3632 .append(g1_policy()->during_initial_mark_pause() ? " (initial-mark)" : ""); |
|
9d679effd28c
7166894: Add gc cause to GC logging for all collectors
brutisso
parents:
6059
diff
changeset
|
3633 TraceTime t(gc_cause_str, G1Log::fine() && !G1Log::finer(), true, gclog_or_tty); |
|
838
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
parents:
811
diff
changeset
|
3634 |
|
3289
b52782ae3880
6946417: G1: Java VisualVM does not support G1 properly.
jmasa
parents:
3285
diff
changeset
|
3635 TraceCollectorStats tcs(g1mm()->incremental_collection_counters()); |
|
3356
78542e2b5e35
7036199: Adding a notification to the implementation of GarbageCollectorMXBeans
fparain
parents:
3323
diff
changeset
|
3636 TraceMemoryManagerStats tms(false /* fullGC */, gc_cause()); |
|
1089
db0d5eba9d20
6815790: G1: Missing MemoryPoolMXBeans with -XX:+UseG1GC
tonyp
parents:
1088
diff
changeset
|
3637 |
| 2361 | 3638 // If the secondary_free_list is not empty, append it to the |
| 3639 // free_list. No need to wait for the cleanup operation to finish; | |
| 3640 // the region allocation code will check the secondary_free_list | |
| 3641 // and wait if necessary. If the G1StressConcRegionFreeing flag is | |
| 3642 // set, skip this step so that the region allocation code has to | |
| 3643 // get entries from the secondary_free_list. | |
| 2152 | 3644 if (!G1StressConcRegionFreeing) { |
| 2361 | 3645 append_secondary_free_list_if_not_empty_with_lock(); |
| 2152 | 3646 } |
|
838
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
parents:
811
diff
changeset
|
3647 |
|
3867
ff53346271fe
6814390: G1: remove the concept of non-generational G1
brutisso
parents:
3830
diff
changeset
|
3648 assert(check_young_list_well_formed(), |
|
ff53346271fe
6814390: G1: remove the concept of non-generational G1
brutisso
parents:
3830
diff
changeset
|
3649 "young list should be well formed"); |
|
838
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
parents:
811
diff
changeset
|
3650 |
|
4095
bca17e38de00
6593758: RFE: Enhance GC ergonomics to dynamically choose ParallelGCThreads
jmasa
parents:
4090
diff
changeset
|
3651 // 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
|
3652 // 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
|
3653 // it will be set. |
|
bca17e38de00
6593758: RFE: Enhance GC ergonomics to dynamically choose ParallelGCThreads
jmasa
parents:
4090
diff
changeset
|
3654 |
|
838
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
parents:
811
diff
changeset
|
3655 { // 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
|
3656 IsGCActiveMark x; |
|
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
parents:
811
diff
changeset
|
3657 |
|
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
parents:
811
diff
changeset
|
3658 gc_prologue(false); |
|
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
parents:
811
diff
changeset
|
3659 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
|
3660 increment_gc_time_stamp(); |
| 342 | 3661 |
|
838
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
parents:
811
diff
changeset
|
3662 if (VerifyBeforeGC && total_collections() >= VerifyGCStartAt) { |
|
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
parents:
811
diff
changeset
|
3663 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
|
3664 gclog_or_tty->print(" VerifyBeforeGC:"); |
|
838
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
parents:
811
diff
changeset
|
3665 prepare_for_verify(); |
| 6008 | 3666 Universe::verify(/* silent */ false, |
|
3772
6747fd0512e0
7004681: G1: Extend marking verification to Full GCs
johnc
parents:
3766
diff
changeset
|
3667 /* option */ VerifyOption_G1UsePrevMarking); |
|
838
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
parents:
811
diff
changeset
|
3668 } |
|
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
parents:
811
diff
changeset
|
3669 |
|
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
parents:
811
diff
changeset
|
3670 COMPILER2_PRESENT(DerivedPointerTable::clear()); |
|
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
parents:
811
diff
changeset
|
3671 |
|
3979
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3672 // Please see comment in g1CollectedHeap.hpp and |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3673 // G1CollectedHeap::ref_processing_init() to see how |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3674 // reference processing currently works in G1. |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3675 |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3676 // Enable discovery in the STW reference processor |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3677 ref_processor_stw()->enable_discovery(true /*verify_disabled*/, |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3678 true /*verify_no_refs*/); |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3679 |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3680 { |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3681 // We want to temporarily turn off discovery by the |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3682 // CM ref processor, if necessary, and turn it back on |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3683 // on again later if we do. Using a scoped |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3684 // NoRefDiscovery object will do this. |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3685 NoRefDiscovery no_cm_discovery(ref_processor_cm()); |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3686 |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3687 // 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
|
3688 // of the collection set!). |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3689 release_mutator_alloc_region(); |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3690 |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3691 // We should call this after we retire the mutator alloc |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3692 // region(s) so that all the ALLOC / RETIRE events are generated |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3693 // before the start GC event. |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3694 _hr_printer.start_gc(false /* full */, (size_t) total_collections()); |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3695 |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3696 // The elapsed time induced by the start time below deliberately elides |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3697 // the possible verification above. |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3698 double start_time_sec = os::elapsedTime(); |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3699 size_t start_used_bytes = used(); |
|
838
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
parents:
811
diff
changeset
|
3700 |
|
1394
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
3701 #if YOUNG_LIST_VERBOSE |
|
3979
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3702 gclog_or_tty->print_cr("\nBefore recording pause start.\nYoung_list:"); |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3703 _young_list->print(); |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3704 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
|
3705 #endif // YOUNG_LIST_VERBOSE |
|
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
3706 |
|
3979
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3707 g1_policy()->record_collection_pause_start(start_time_sec, |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3708 start_used_bytes); |
|
838
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
parents:
811
diff
changeset
|
3709 |
|
4837
eff609af17d7
7127706: G1: re-enable survivors during the initial-mark pause
tonyp
parents:
4836
diff
changeset
|
3710 double scan_wait_start = os::elapsedTime(); |
|
eff609af17d7
7127706: G1: re-enable survivors during the initial-mark pause
tonyp
parents:
4836
diff
changeset
|
3711 // We have to wait until the CM threads finish scanning the |
|
eff609af17d7
7127706: G1: re-enable survivors during the initial-mark pause
tonyp
parents:
4836
diff
changeset
|
3712 // root regions as it's the only way to ensure that all the |
|
eff609af17d7
7127706: G1: re-enable survivors during the initial-mark pause
tonyp
parents:
4836
diff
changeset
|
3713 // objects on them have been correctly scanned before we start |
|
eff609af17d7
7127706: G1: re-enable survivors during the initial-mark pause
tonyp
parents:
4836
diff
changeset
|
3714 // moving them during the GC. |
|
eff609af17d7
7127706: G1: re-enable survivors during the initial-mark pause
tonyp
parents:
4836
diff
changeset
|
3715 bool waited = _cm->root_regions()->wait_until_scan_finished(); |
|
eff609af17d7
7127706: G1: re-enable survivors during the initial-mark pause
tonyp
parents:
4836
diff
changeset
|
3716 if (waited) { |
|
eff609af17d7
7127706: G1: re-enable survivors during the initial-mark pause
tonyp
parents:
4836
diff
changeset
|
3717 double scan_wait_end = os::elapsedTime(); |
|
eff609af17d7
7127706: G1: re-enable survivors during the initial-mark pause
tonyp
parents:
4836
diff
changeset
|
3718 double wait_time_ms = (scan_wait_end - scan_wait_start) * 1000.0; |
|
eff609af17d7
7127706: G1: re-enable survivors during the initial-mark pause
tonyp
parents:
4836
diff
changeset
|
3719 g1_policy()->record_root_region_scan_wait_time(wait_time_ms); |
|
eff609af17d7
7127706: G1: re-enable survivors during the initial-mark pause
tonyp
parents:
4836
diff
changeset
|
3720 } |
|
eff609af17d7
7127706: G1: re-enable survivors during the initial-mark pause
tonyp
parents:
4836
diff
changeset
|
3721 |
|
1394
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
3722 #if YOUNG_LIST_VERBOSE |
|
3979
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3723 gclog_or_tty->print_cr("\nAfter recording pause start.\nYoung_list:"); |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3724 _young_list->print(); |
|
1394
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
3725 #endif // YOUNG_LIST_VERBOSE |
| 342 | 3726 |
|
3979
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3727 if (g1_policy()->during_initial_mark_pause()) { |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3728 concurrent_mark()->checkpointRootsInitialPre(); |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3729 } |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3730 perm_gen()->save_marks(); |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3731 |
|
1394
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
3732 #if YOUNG_LIST_VERBOSE |
|
3979
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3733 gclog_or_tty->print_cr("\nBefore choosing collection set.\nYoung_list:"); |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3734 _young_list->print(); |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3735 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
|
3736 #endif // YOUNG_LIST_VERBOSE |
|
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
3737 |
|
4912
a9647476d1a4
7132029: G1: mixed GC phase lasts for longer than it should
tonyp
parents:
4910
diff
changeset
|
3738 g1_policy()->finalize_cset(target_pause_time_ms); |
|
3979
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3739 |
|
4787
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
4785
diff
changeset
|
3740 _cm->note_start_of_gc(); |
|
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
4785
diff
changeset
|
3741 // We should not verify the per-thread SATB buffers given that |
|
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
4785
diff
changeset
|
3742 // we have not filtered them yet (we'll do so during the |
|
4912
a9647476d1a4
7132029: G1: mixed GC phase lasts for longer than it should
tonyp
parents:
4910
diff
changeset
|
3743 // GC). We also call this after finalize_cset() to |
|
4787
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
4785
diff
changeset
|
3744 // ensure that the CSet has been finalized. |
|
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
4785
diff
changeset
|
3745 _cm->verify_no_cset_oops(true /* verify_stacks */, |
|
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
4785
diff
changeset
|
3746 true /* verify_enqueued_buffers */, |
|
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
4785
diff
changeset
|
3747 false /* verify_thread_buffers */, |
|
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
4785
diff
changeset
|
3748 true /* verify_fingers */); |
|
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
4785
diff
changeset
|
3749 |
|
3979
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3750 if (_hr_printer.is_active()) { |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3751 HeapRegion* hr = g1_policy()->collection_set(); |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3752 while (hr != NULL) { |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3753 G1HRPrinter::RegionType type; |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3754 if (!hr->is_young()) { |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3755 type = G1HRPrinter::Old; |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3756 } else if (hr->is_survivor()) { |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3757 type = G1HRPrinter::Survivor; |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3758 } else { |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3759 type = G1HRPrinter::Eden; |
|
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 _hr_printer.cset(hr); |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3762 hr = hr->next_in_collection_set(); |
|
3778
5f6f2615433a
7049999: G1: Make the G1PrintHeapRegions output consistent and complete
tonyp
parents:
3777
diff
changeset
|
3763 } |
|
5f6f2615433a
7049999: G1: Make the G1PrintHeapRegions output consistent and complete
tonyp
parents:
3777
diff
changeset
|
3764 } |
|
3979
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3765 |
|
3777
e8b0b0392037
7046182: G1: remove unnecessary iterations over the collection set
tonyp
parents:
3774
diff
changeset
|
3766 #ifdef ASSERT |
|
3979
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3767 VerifyCSetClosure cl; |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3768 collection_set_iterate(&cl); |
|
3777
e8b0b0392037
7046182: G1: remove unnecessary iterations over the collection set
tonyp
parents:
3774
diff
changeset
|
3769 #endif // ASSERT |
| 1707 | 3770 |
|
3979
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3771 setup_surviving_young_words(); |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3772 |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3773 // Initialize the GC alloc regions. |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3774 init_gc_alloc_regions(); |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3775 |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3776 // Actually do the work... |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3777 evacuate_collection_set(); |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3778 |
|
4787
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
4785
diff
changeset
|
3779 // We do this to mainly verify the per-thread SATB buffers |
|
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
4785
diff
changeset
|
3780 // (which have been filtered by now) since we didn't verify |
|
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
4785
diff
changeset
|
3781 // them earlier. No point in re-checking the stacks / enqueued |
|
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
4785
diff
changeset
|
3782 // buffers given that the CSet has not changed since last time |
|
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
4785
diff
changeset
|
3783 // we checked. |
|
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
4785
diff
changeset
|
3784 _cm->verify_no_cset_oops(false /* verify_stacks */, |
|
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
4785
diff
changeset
|
3785 false /* verify_enqueued_buffers */, |
|
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
4785
diff
changeset
|
3786 true /* verify_thread_buffers */, |
|
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
4785
diff
changeset
|
3787 true /* verify_fingers */); |
|
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
4785
diff
changeset
|
3788 |
|
3979
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3789 free_collection_set(g1_policy()->collection_set()); |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3790 g1_policy()->clear_collection_set(); |
|
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 cleanup_surviving_young_words(); |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3793 |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3794 // Start a new incremental collection set for the next pause. |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3795 g1_policy()->start_incremental_cset_building(); |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3796 |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3797 // Clear the _cset_fast_test bitmap in anticipation of adding |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3798 // regions to the incremental collection set for the next |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3799 // evacuation pause. |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3800 clear_cset_fast_test(); |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3801 |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3802 _young_list->reset_sampled_info(); |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3803 |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3804 // Don't check the whole heap at this point as the |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3805 // GC alloc regions from this pause have been tagged |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3806 // as survivors and moved on to the survivor list. |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3807 // Survivor regions will fail the !is_young() check. |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3808 assert(check_young_list_empty(false /* check_heap */), |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3809 "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
|
3810 |
|
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
3811 #if YOUNG_LIST_VERBOSE |
|
3979
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3812 gclog_or_tty->print_cr("Before recording survivors.\nYoung List:"); |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3813 _young_list->print(); |
|
1394
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
3814 #endif // YOUNG_LIST_VERBOSE |
| 342 | 3815 |
|
3979
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3816 g1_policy()->record_survivor_regions(_young_list->survivor_length(), |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3817 _young_list->first_survivor_region(), |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3818 _young_list->last_survivor_region()); |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3819 |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3820 _young_list->reset_auxilary_lists(); |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3821 |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3822 if (evacuation_failed()) { |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3823 _summary_bytes_used = recalculate_used(); |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3824 } else { |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3825 // The "used" of the the collection set have already been subtracted |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3826 // when they were freed. Add in the bytes evacuated. |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3827 _summary_bytes_used += g1_policy()->bytes_copied_during_gc(); |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3828 } |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3829 |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3830 if (g1_policy()->during_initial_mark_pause()) { |
|
4837
eff609af17d7
7127706: G1: re-enable survivors during the initial-mark pause
tonyp
parents:
4836
diff
changeset
|
3831 // We have to do this before we notify the CM threads that |
|
eff609af17d7
7127706: G1: re-enable survivors during the initial-mark pause
tonyp
parents:
4836
diff
changeset
|
3832 // they can start working to make sure that all the |
|
eff609af17d7
7127706: G1: re-enable survivors during the initial-mark pause
tonyp
parents:
4836
diff
changeset
|
3833 // appropriate initialization is done on the CM object. |
|
3979
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3834 concurrent_mark()->checkpointRootsInitialPost(); |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3835 set_marking_started(); |
|
4831
7ca7be5a6a0b
7129271: G1: Interference from multiple threads in PrintGC/PrintGCDetails output
johnc
parents:
4829
diff
changeset
|
3836 // Note that we don't actually trigger the CM thread at |
|
7ca7be5a6a0b
7129271: G1: Interference from multiple threads in PrintGC/PrintGCDetails output
johnc
parents:
4829
diff
changeset
|
3837 // this point. We do that later when we're sure that |
|
7ca7be5a6a0b
7129271: G1: Interference from multiple threads in PrintGC/PrintGCDetails output
johnc
parents:
4829
diff
changeset
|
3838 // the current thread has completed its logging output. |
|
3979
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3839 } |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3840 |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3841 allocate_dummy_regions(); |
|
3285
49a67202bc67
7011855: G1: non-product flag to artificially grow the heap
tonyp
parents:
2433
diff
changeset
|
3842 |
|
1394
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
3843 #if YOUNG_LIST_VERBOSE |
|
3979
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3844 gclog_or_tty->print_cr("\nEnd of the pause.\nYoung_list:"); |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3845 _young_list->print(); |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3846 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
|
3847 #endif // YOUNG_LIST_VERBOSE |
| 342 | 3848 |
|
3979
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3849 init_mutator_alloc_region(); |
|
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 { |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3852 size_t expand_bytes = g1_policy()->expansion_amount(); |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3853 if (expand_bytes > 0) { |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3854 size_t bytes_before = capacity(); |
| 4785 | 3855 // No need for an ergo verbose message here, |
| 3856 // expansion_amount() does this when it returns a value > 0. | |
|
3979
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3857 if (!expand(expand_bytes)) { |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3858 // We failed to expand the heap so let's verify that |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3859 // committed/uncommitted amount match the backing store |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3860 assert(capacity() == _g1_storage.committed_size(), "committed size mismatch"); |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3861 assert(max_capacity() == _g1_storage.reserved_size(), "reserved size mismatch"); |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3862 } |
|
3920
af2ab04e0038
6929868: G1: introduce min / max young gen size bounds
brutisso
parents:
3919
diff
changeset
|
3863 } |
|
af2ab04e0038
6929868: G1: introduce min / max young gen size bounds
brutisso
parents:
3919
diff
changeset
|
3864 } |
|
3979
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3865 |
|
4787
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
4785
diff
changeset
|
3866 // We redo the verificaiton but now wrt to the new CSet which |
|
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
4785
diff
changeset
|
3867 // has just got initialized after the previous CSet was freed. |
|
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
4785
diff
changeset
|
3868 _cm->verify_no_cset_oops(true /* verify_stacks */, |
|
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
4785
diff
changeset
|
3869 true /* verify_enqueued_buffers */, |
|
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
4785
diff
changeset
|
3870 true /* verify_thread_buffers */, |
|
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
4785
diff
changeset
|
3871 true /* verify_fingers */); |
|
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
4785
diff
changeset
|
3872 _cm->note_end_of_gc(); |
|
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
4785
diff
changeset
|
3873 |
|
3979
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3874 double end_time_sec = os::elapsedTime(); |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3875 double pause_time_ms = (end_time_sec - start_time_sec) * MILLIUNITS; |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3876 g1_policy()->record_pause_time_ms(pause_time_ms); |
| 4711 | 3877 int active_workers = (G1CollectedHeap::use_parallel_gc_threads() ? |
| 3878 workers()->active_workers() : 1); | |
| 3879 g1_policy()->record_collection_pause_end(active_workers); | |
|
3979
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3880 |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3881 MemoryService::track_memory_usage(); |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3882 |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3883 // 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
|
3884 // update buffers to bring the RSets up-to-date if |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3885 // G1HRRSFlushLogBuffersOnVerify has been set. While scanning |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3886 // 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
|
3887 // regions we just allocated to (i.e., the GC alloc |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3888 // regions). However, during the last GC we called |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3889 // set_saved_mark() on all the GC alloc regions, so card |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3890 // scanning might skip the [saved_mark_word()...top()] area of |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3891 // those regions (i.e., the area we allocated objects into |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3892 // during the last GC). But it shouldn't. Given that |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3893 // saved_mark_word() is conditional on whether the GC time stamp |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3894 // 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
|
3895 // 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
|
3896 // regions and saved_mark_word() will simply return top() for |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3897 // 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
|
3898 // than iterating over the regions and fixing them. In fact, the |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3899 // GC time stamp increment here also ensures that |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3900 // saved_mark_word() will return top() between pauses, i.e., |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3901 // during concurrent refinement. So we don't need the |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3902 // is_gc_active() check to decided which top to use when |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3903 // scanning cards (see CR 7039627). |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3904 increment_gc_time_stamp(); |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3905 |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3906 if (VerifyAfterGC && total_collections() >= VerifyGCStartAt) { |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3907 HandleMark hm; // Discard invalid handles created during verification |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3908 gclog_or_tty->print(" VerifyAfterGC:"); |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3909 prepare_for_verify(); |
| 6008 | 3910 Universe::verify(/* silent */ false, |
|
3979
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3911 /* option */ VerifyOption_G1UsePrevMarking); |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3912 } |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3913 |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3914 assert(!ref_processor_stw()->discovery_enabled(), "Postcondition"); |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3915 ref_processor_stw()->verify_no_references_recorded(); |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3916 |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3917 // 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
|
3918 } |
|
af2ab04e0038
6929868: G1: introduce min / max young gen size bounds
brutisso
parents:
3919
diff
changeset
|
3919 |
|
3778
5f6f2615433a
7049999: G1: Make the G1PrintHeapRegions output consistent and complete
tonyp
parents:
3777
diff
changeset
|
3920 // 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
|
3921 // 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
|
3922 // 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
|
3923 // RETIRE events are generated before the end GC event. |
|
5f6f2615433a
7049999: G1: Make the G1PrintHeapRegions output consistent and complete
tonyp
parents:
3777
diff
changeset
|
3924 _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
|
3925 |
|
3764
053d84a76d3d
7032531: G1: enhance GC logging to include more accurate eden / survivor size transitions
tonyp
parents:
3378
diff
changeset
|
3926 // 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
|
3927 g1_policy()->print_heap_transition(); |
|
838
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
parents:
811
diff
changeset
|
3928 |
|
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
parents:
811
diff
changeset
|
3929 if (mark_in_progress()) { |
|
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
parents:
811
diff
changeset
|
3930 concurrent_mark()->update_g1_committed(); |
|
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
parents:
811
diff
changeset
|
3931 } |
|
546
05c6d52fa7a9
6690928: Use spinning in combination with yields for workstealing termination.
jmasa
parents:
545
diff
changeset
|
3932 |
|
05c6d52fa7a9
6690928: Use spinning in combination with yields for workstealing termination.
jmasa
parents:
545
diff
changeset
|
3933 #ifdef TRACESPINNING |
|
838
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
parents:
811
diff
changeset
|
3934 ParallelTaskTerminator::print_termination_counts(); |
|
546
05c6d52fa7a9
6690928: Use spinning in combination with yields for workstealing termination.
jmasa
parents:
545
diff
changeset
|
3935 #endif |
| 342 | 3936 |
|
838
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
parents:
811
diff
changeset
|
3937 gc_epilogue(false); |
|
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
parents:
811
diff
changeset
|
3938 } |
|
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
parents:
811
diff
changeset
|
3939 } |
|
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
parents:
811
diff
changeset
|
3940 |
|
4831
7ca7be5a6a0b
7129271: G1: Interference from multiple threads in PrintGC/PrintGCDetails output
johnc
parents:
4829
diff
changeset
|
3941 // The closing of the inner scope, immediately above, will complete |
|
6007
5c86f8211d1e
7160728: Introduce an extra logging level for G1 logging
brutisso
parents:
5987
diff
changeset
|
3942 // logging at the "fine" level. The record_collection_pause_end() call |
|
5c86f8211d1e
7160728: Introduce an extra logging level for G1 logging
brutisso
parents:
5987
diff
changeset
|
3943 // above will complete logging at the "finer" level. |
|
4831
7ca7be5a6a0b
7129271: G1: Interference from multiple threads in PrintGC/PrintGCDetails output
johnc
parents:
4829
diff
changeset
|
3944 // |
|
7ca7be5a6a0b
7129271: G1: Interference from multiple threads in PrintGC/PrintGCDetails output
johnc
parents:
4829
diff
changeset
|
3945 // It is not yet to safe, however, to tell the concurrent mark to |
|
7ca7be5a6a0b
7129271: G1: Interference from multiple threads in PrintGC/PrintGCDetails output
johnc
parents:
4829
diff
changeset
|
3946 // start as we have some optional output below. We don't want the |
|
7ca7be5a6a0b
7129271: G1: Interference from multiple threads in PrintGC/PrintGCDetails output
johnc
parents:
4829
diff
changeset
|
3947 // output from the concurrent mark thread interfering with this |
|
7ca7be5a6a0b
7129271: G1: Interference from multiple threads in PrintGC/PrintGCDetails output
johnc
parents:
4829
diff
changeset
|
3948 // logging output either. |
|
7ca7be5a6a0b
7129271: G1: Interference from multiple threads in PrintGC/PrintGCDetails output
johnc
parents:
4829
diff
changeset
|
3949 |
| 3766 | 3950 _hrs.verify_optional(); |
| 2152 | 3951 verify_region_sets_optional(); |
| 3952 | |
| 1709 | 3953 TASKQUEUE_STATS_ONLY(if (ParallelGCVerbose) print_taskqueue_stats()); |
| 3954 TASKQUEUE_STATS_ONLY(reset_taskqueue_stats()); | |
| 3955 | |
|
4872
aa3d708d67c4
7141200: log some interesting information in ring buffers for crashes
never
parents:
4787
diff
changeset
|
3956 print_heap_after_gc(); |
|
3980
8229bd737950
7075646: G1: fix inconsistencies in the monitoring data
tonyp
parents:
3979
diff
changeset
|
3957 g1mm()->update_sizes(); |
|
3289
b52782ae3880
6946417: G1: Java VisualVM does not support G1 properly.
jmasa
parents:
3285
diff
changeset
|
3958 |
|
884
83b687ce3090
6866591: G1: print update buffer processing stats more often
tonyp
parents:
883
diff
changeset
|
3959 if (G1SummarizeRSetStats && |
|
83b687ce3090
6866591: G1: print update buffer processing stats more often
tonyp
parents:
883
diff
changeset
|
3960 (G1SummarizeRSetStatsPeriod > 0) && |
|
83b687ce3090
6866591: G1: print update buffer processing stats more often
tonyp
parents:
883
diff
changeset
|
3961 (total_collections() % G1SummarizeRSetStatsPeriod == 0)) { |
|
83b687ce3090
6866591: G1: print update buffer processing stats more often
tonyp
parents:
883
diff
changeset
|
3962 g1_rem_set()->print_summary_info(); |
|
83b687ce3090
6866591: G1: print update buffer processing stats more often
tonyp
parents:
883
diff
changeset
|
3963 } |
| 1973 | 3964 |
|
4831
7ca7be5a6a0b
7129271: G1: Interference from multiple threads in PrintGC/PrintGCDetails output
johnc
parents:
4829
diff
changeset
|
3965 // It should now be safe to tell the concurrent mark thread to start |
|
7ca7be5a6a0b
7129271: G1: Interference from multiple threads in PrintGC/PrintGCDetails output
johnc
parents:
4829
diff
changeset
|
3966 // without its logging output interfering with the logging output |
|
7ca7be5a6a0b
7129271: G1: Interference from multiple threads in PrintGC/PrintGCDetails output
johnc
parents:
4829
diff
changeset
|
3967 // that came from the pause. |
|
7ca7be5a6a0b
7129271: G1: Interference from multiple threads in PrintGC/PrintGCDetails output
johnc
parents:
4829
diff
changeset
|
3968 |
|
7ca7be5a6a0b
7129271: G1: Interference from multiple threads in PrintGC/PrintGCDetails output
johnc
parents:
4829
diff
changeset
|
3969 if (should_start_conc_mark) { |
|
7ca7be5a6a0b
7129271: G1: Interference from multiple threads in PrintGC/PrintGCDetails output
johnc
parents:
4829
diff
changeset
|
3970 // CAUTION: after the doConcurrentMark() call below, |
|
7ca7be5a6a0b
7129271: G1: Interference from multiple threads in PrintGC/PrintGCDetails output
johnc
parents:
4829
diff
changeset
|
3971 // the concurrent marking thread(s) could be running |
|
7ca7be5a6a0b
7129271: G1: Interference from multiple threads in PrintGC/PrintGCDetails output
johnc
parents:
4829
diff
changeset
|
3972 // concurrently with us. Make sure that anything after |
|
7ca7be5a6a0b
7129271: G1: Interference from multiple threads in PrintGC/PrintGCDetails output
johnc
parents:
4829
diff
changeset
|
3973 // this point does not assume that we are the only GC thread |
|
7ca7be5a6a0b
7129271: G1: Interference from multiple threads in PrintGC/PrintGCDetails output
johnc
parents:
4829
diff
changeset
|
3974 // running. Note: of course, the actual marking work will |
|
7ca7be5a6a0b
7129271: G1: Interference from multiple threads in PrintGC/PrintGCDetails output
johnc
parents:
4829
diff
changeset
|
3975 // not start until the safepoint itself is released in |
|
7ca7be5a6a0b
7129271: G1: Interference from multiple threads in PrintGC/PrintGCDetails output
johnc
parents:
4829
diff
changeset
|
3976 // ConcurrentGCThread::safepoint_desynchronize(). |
|
7ca7be5a6a0b
7129271: G1: Interference from multiple threads in PrintGC/PrintGCDetails output
johnc
parents:
4829
diff
changeset
|
3977 doConcurrentMark(); |
|
7ca7be5a6a0b
7129271: G1: Interference from multiple threads in PrintGC/PrintGCDetails output
johnc
parents:
4829
diff
changeset
|
3978 } |
|
7ca7be5a6a0b
7129271: G1: Interference from multiple threads in PrintGC/PrintGCDetails output
johnc
parents:
4829
diff
changeset
|
3979 |
| 1973 | 3980 return true; |
| 342 | 3981 } |
| 3982 | |
|
1391
79e419e5ea3b
6942253: G1: replace G1ParallelGCAllocBufferSize with YoungPLABSize and OldPLABSize
apetrusenko
parents:
1390
diff
changeset
|
3983 size_t G1CollectedHeap::desired_plab_sz(GCAllocPurpose purpose) |
|
79e419e5ea3b
6942253: G1: replace G1ParallelGCAllocBufferSize with YoungPLABSize and OldPLABSize
apetrusenko
parents:
1390
diff
changeset
|
3984 { |
|
79e419e5ea3b
6942253: G1: replace G1ParallelGCAllocBufferSize with YoungPLABSize and OldPLABSize
apetrusenko
parents:
1390
diff
changeset
|
3985 size_t gclab_word_size; |
|
79e419e5ea3b
6942253: G1: replace G1ParallelGCAllocBufferSize with YoungPLABSize and OldPLABSize
apetrusenko
parents:
1390
diff
changeset
|
3986 switch (purpose) { |
|
79e419e5ea3b
6942253: G1: replace G1ParallelGCAllocBufferSize with YoungPLABSize and OldPLABSize
apetrusenko
parents:
1390
diff
changeset
|
3987 case GCAllocForSurvived: |
|
79e419e5ea3b
6942253: G1: replace G1ParallelGCAllocBufferSize with YoungPLABSize and OldPLABSize
apetrusenko
parents:
1390
diff
changeset
|
3988 gclab_word_size = YoungPLABSize; |
|
79e419e5ea3b
6942253: G1: replace G1ParallelGCAllocBufferSize with YoungPLABSize and OldPLABSize
apetrusenko
parents:
1390
diff
changeset
|
3989 break; |
|
79e419e5ea3b
6942253: G1: replace G1ParallelGCAllocBufferSize with YoungPLABSize and OldPLABSize
apetrusenko
parents:
1390
diff
changeset
|
3990 case GCAllocForTenured: |
|
79e419e5ea3b
6942253: G1: replace G1ParallelGCAllocBufferSize with YoungPLABSize and OldPLABSize
apetrusenko
parents:
1390
diff
changeset
|
3991 gclab_word_size = OldPLABSize; |
|
79e419e5ea3b
6942253: G1: replace G1ParallelGCAllocBufferSize with YoungPLABSize and OldPLABSize
apetrusenko
parents:
1390
diff
changeset
|
3992 break; |
|
79e419e5ea3b
6942253: G1: replace G1ParallelGCAllocBufferSize with YoungPLABSize and OldPLABSize
apetrusenko
parents:
1390
diff
changeset
|
3993 default: |
|
79e419e5ea3b
6942253: G1: replace G1ParallelGCAllocBufferSize with YoungPLABSize and OldPLABSize
apetrusenko
parents:
1390
diff
changeset
|
3994 assert(false, "unknown GCAllocPurpose"); |
|
79e419e5ea3b
6942253: G1: replace G1ParallelGCAllocBufferSize with YoungPLABSize and OldPLABSize
apetrusenko
parents:
1390
diff
changeset
|
3995 gclab_word_size = OldPLABSize; |
|
79e419e5ea3b
6942253: G1: replace G1ParallelGCAllocBufferSize with YoungPLABSize and OldPLABSize
apetrusenko
parents:
1390
diff
changeset
|
3996 break; |
|
79e419e5ea3b
6942253: G1: replace G1ParallelGCAllocBufferSize with YoungPLABSize and OldPLABSize
apetrusenko
parents:
1390
diff
changeset
|
3997 } |
|
79e419e5ea3b
6942253: G1: replace G1ParallelGCAllocBufferSize with YoungPLABSize and OldPLABSize
apetrusenko
parents:
1390
diff
changeset
|
3998 return gclab_word_size; |
|
79e419e5ea3b
6942253: G1: replace G1ParallelGCAllocBufferSize with YoungPLABSize and OldPLABSize
apetrusenko
parents:
1390
diff
changeset
|
3999 } |
|
79e419e5ea3b
6942253: G1: replace G1ParallelGCAllocBufferSize with YoungPLABSize and OldPLABSize
apetrusenko
parents:
1390
diff
changeset
|
4000 |
|
2433
abdfc822206f
7023069: G1: Introduce symmetric locking in the slow allocation path
tonyp
parents:
2432
diff
changeset
|
4001 void G1CollectedHeap::init_mutator_alloc_region() { |
|
abdfc822206f
7023069: G1: Introduce symmetric locking in the slow allocation path
tonyp
parents:
2432
diff
changeset
|
4002 assert(_mutator_alloc_region.get() == NULL, "pre-condition"); |
|
abdfc822206f
7023069: G1: Introduce symmetric locking in the slow allocation path
tonyp
parents:
2432
diff
changeset
|
4003 _mutator_alloc_region.init(); |
|
abdfc822206f
7023069: G1: Introduce symmetric locking in the slow allocation path
tonyp
parents:
2432
diff
changeset
|
4004 } |
|
abdfc822206f
7023069: G1: Introduce symmetric locking in the slow allocation path
tonyp
parents:
2432
diff
changeset
|
4005 |
|
abdfc822206f
7023069: G1: Introduce symmetric locking in the slow allocation path
tonyp
parents:
2432
diff
changeset
|
4006 void G1CollectedHeap::release_mutator_alloc_region() { |
|
abdfc822206f
7023069: G1: Introduce symmetric locking in the slow allocation path
tonyp
parents:
2432
diff
changeset
|
4007 _mutator_alloc_region.release(); |
|
abdfc822206f
7023069: G1: Introduce symmetric locking in the slow allocation path
tonyp
parents:
2432
diff
changeset
|
4008 assert(_mutator_alloc_region.get() == NULL, "post-condition"); |
|
abdfc822206f
7023069: G1: Introduce symmetric locking in the slow allocation path
tonyp
parents:
2432
diff
changeset
|
4009 } |
|
1391
79e419e5ea3b
6942253: G1: replace G1ParallelGCAllocBufferSize with YoungPLABSize and OldPLABSize
apetrusenko
parents:
1390
diff
changeset
|
4010 |
|
3830
f44782f04dd4
7039627: G1: avoid BOT updates for survivor allocations and dirty survivor regions incrementally
tonyp
parents:
3824
diff
changeset
|
4011 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
|
4012 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
|
4013 |
|
f44782f04dd4
7039627: G1: avoid BOT updates for survivor allocations and dirty survivor regions incrementally
tonyp
parents:
3824
diff
changeset
|
4014 _survivor_gc_alloc_region.init(); |
|
f44782f04dd4
7039627: G1: avoid BOT updates for survivor allocations and dirty survivor regions incrementally
tonyp
parents:
3824
diff
changeset
|
4015 _old_gc_alloc_region.init(); |
|
f44782f04dd4
7039627: G1: avoid BOT updates for survivor allocations and dirty survivor regions incrementally
tonyp
parents:
3824
diff
changeset
|
4016 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
|
4017 _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
|
4018 |
|
f44782f04dd4
7039627: G1: avoid BOT updates for survivor allocations and dirty survivor regions incrementally
tonyp
parents:
3824
diff
changeset
|
4019 // 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
|
4020 // 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
|
4021 // 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
|
4022 // 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
|
4023 // 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
|
4024 // 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
|
4025 // 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
|
4026 // 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
|
4027 // 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
|
4028 if (retained_region != NULL && |
|
f44782f04dd4
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4029 !retained_region->in_collection_set() && |
|
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4030 !(retained_region->top() == retained_region->end()) && |
|
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4031 !retained_region->is_empty() && |
|
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|
4032 !retained_region->isHumongous()) { |
|
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|
4033 retained_region->set_saved_mark(); |
| 4072 | 4034 // The retained region was added to the old region set when it was |
| 4035 // retired. We have to remove it now, since we don't allow regions | |
| 4036 // we allocate to in the region sets. We'll re-add it later, when | |
| 4037 // it's retired again. | |
| 4038 _old_set.remove(retained_region); | |
|
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4039 bool during_im = g1_policy()->during_initial_mark_pause(); |
|
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4040 retained_region->note_start_of_copying(during_im); |
|
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4041 _old_gc_alloc_region.set(retained_region); |
|
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|
4042 _hr_printer.reuse(retained_region); |
| 342 | 4043 } |
| 4044 } | |
| 4045 | |
|
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4046 void G1CollectedHeap::release_gc_alloc_regions() { |
|
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4047 _survivor_gc_alloc_region.release(); |
|
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4048 // If we have an old GC alloc region to release, we'll save it in |
|
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4049 // _retained_old_gc_alloc_region. If we don't |
|
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|
4050 // _retained_old_gc_alloc_region will become NULL. This is what we |
|
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|
4051 // want either way so no reason to check explicitly for either |
|
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|
4052 // condition. |
|
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4053 _retained_old_gc_alloc_region = _old_gc_alloc_region.release(); |
| 342 | 4054 } |
| 4055 | |
|
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4056 void G1CollectedHeap::abandon_gc_alloc_regions() { |
|
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4057 assert(_survivor_gc_alloc_region.get() == NULL, "pre-condition"); |
|
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4058 assert(_old_gc_alloc_region.get() == NULL, "pre-condition"); |
|
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|
4059 _retained_old_gc_alloc_region = NULL; |
| 342 | 4060 } |
| 4061 | |
| 4062 void G1CollectedHeap::init_for_evac_failure(OopsInHeapRegionClosure* cl) { | |
| 4063 _drain_in_progress = false; | |
| 4064 set_evac_failure_closure(cl); | |
| 4065 _evac_failure_scan_stack = new (ResourceObj::C_HEAP) GrowableArray<oop>(40, true); | |
| 4066 } | |
| 4067 | |
| 4068 void G1CollectedHeap::finalize_for_evac_failure() { | |
| 4069 assert(_evac_failure_scan_stack != NULL && | |
| 4070 _evac_failure_scan_stack->length() == 0, | |
| 4071 "Postcondition"); | |
| 4072 assert(!_drain_in_progress, "Postcondition"); | |
| 1045 | 4073 delete _evac_failure_scan_stack; |
| 342 | 4074 _evac_failure_scan_stack = NULL; |
| 4075 } | |
| 4076 | |
| 4077 void G1CollectedHeap::remove_self_forwarding_pointers() { | |
|
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|
4078 assert(check_cset_heap_region_claim_values(HeapRegion::InitialClaimValue), "sanity"); |
|
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|
4079 |
|
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|
4080 G1ParRemoveSelfForwardPtrsTask rsfp_task(this); |
|
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4081 |
|
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|
4082 if (G1CollectedHeap::use_parallel_gc_threads()) { |
|
023652e49ac0
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|
4083 set_par_threads(); |
|
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|
4084 workers()->run_task(&rsfp_task); |
|
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|
4085 set_par_threads(0); |
|
616
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6720309: G1: don't synchronously update RSet during evacuation pauses
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|
4086 } else { |
|
4783
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|
4087 rsfp_task.work(0); |
|
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|
4088 } |
|
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|
4089 |
|
023652e49ac0
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|
4090 assert(check_cset_heap_region_claim_values(HeapRegion::ParEvacFailureClaimValue), "sanity"); |
|
023652e49ac0
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|
4091 |
|
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|
4092 // Reset the claim values in the regions in the collection set. |
|
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|
4093 reset_cset_heap_region_claim_values(); |
|
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|
4094 |
|
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|
4095 assert(check_cset_heap_region_claim_values(HeapRegion::InitialClaimValue), "sanity"); |
| 342 | 4096 |
| 4097 // Now restore saved marks, if any. | |
| 4098 if (_objs_with_preserved_marks != NULL) { | |
| 4099 assert(_preserved_marks_of_objs != NULL, "Both or none."); | |
| 4100 guarantee(_objs_with_preserved_marks->length() == | |
| 4101 _preserved_marks_of_objs->length(), "Both or none."); | |
| 4102 for (int i = 0; i < _objs_with_preserved_marks->length(); i++) { | |
| 4103 oop obj = _objs_with_preserved_marks->at(i); | |
| 4104 markOop m = _preserved_marks_of_objs->at(i); | |
| 4105 obj->set_mark(m); | |
| 4106 } | |
|
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|
4107 |
| 342 | 4108 // Delete the preserved marks growable arrays (allocated on the C heap). |
| 4109 delete _objs_with_preserved_marks; | |
| 4110 delete _preserved_marks_of_objs; | |
| 4111 _objs_with_preserved_marks = NULL; | |
| 4112 _preserved_marks_of_objs = NULL; | |
| 4113 } | |
| 4114 } | |
| 4115 | |
| 4116 void G1CollectedHeap::push_on_evac_failure_scan_stack(oop obj) { | |
| 4117 _evac_failure_scan_stack->push(obj); | |
| 4118 } | |
| 4119 | |
| 4120 void G1CollectedHeap::drain_evac_failure_scan_stack() { | |
| 4121 assert(_evac_failure_scan_stack != NULL, "precondition"); | |
| 4122 | |
| 4123 while (_evac_failure_scan_stack->length() > 0) { | |
| 4124 oop obj = _evac_failure_scan_stack->pop(); | |
| 4125 _evac_failure_closure->set_region(heap_region_containing(obj)); | |
| 4126 obj->oop_iterate_backwards(_evac_failure_closure); | |
| 4127 } | |
| 4128 } | |
| 4129 | |
| 4130 oop | |
| 4131 G1CollectedHeap::handle_evacuation_failure_par(OopsInHeapRegionClosure* cl, | |
|
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|
4132 oop old) { |
|
3323
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|
4133 assert(obj_in_cs(old), |
|
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|
4134 err_msg("obj: "PTR_FORMAT" should still be in the CSet", |
|
75af3e8de182
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|
4135 (HeapWord*) old)); |
| 342 | 4136 markOop m = old->mark(); |
| 4137 oop forward_ptr = old->forward_to_atomic(old); | |
| 4138 if (forward_ptr == NULL) { | |
| 4139 // Forward-to-self succeeded. | |
|
3973
663cb89032b1
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|
4140 |
| 342 | 4141 if (_evac_failure_closure != cl) { |
| 4142 MutexLockerEx x(EvacFailureStack_lock, Mutex::_no_safepoint_check_flag); | |
| 4143 assert(!_drain_in_progress, | |
| 4144 "Should only be true while someone holds the lock."); | |
| 4145 // Set the global evac-failure closure to the current thread's. | |
| 4146 assert(_evac_failure_closure == NULL, "Or locking has failed."); | |
| 4147 set_evac_failure_closure(cl); | |
| 4148 // Now do the common part. | |
| 4149 handle_evacuation_failure_common(old, m); | |
| 4150 // Reset to NULL. | |
| 4151 set_evac_failure_closure(NULL); | |
| 4152 } else { | |
| 4153 // The lock is already held, and this is recursive. | |
| 4154 assert(_drain_in_progress, "This should only be the recursive case."); | |
| 4155 handle_evacuation_failure_common(old, m); | |
| 4156 } | |
| 4157 return old; | |
| 4158 } else { | |
|
3323
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|
4159 // Forward-to-self failed. Either someone else managed to allocate |
|
75af3e8de182
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|
4160 // space for this object (old != forward_ptr) or they beat us in |
|
75af3e8de182
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|
4161 // self-forwarding it (old == forward_ptr). |
|
75af3e8de182
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|
4162 assert(old == forward_ptr || !obj_in_cs(forward_ptr), |
|
75af3e8de182
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|
4163 err_msg("obj: "PTR_FORMAT" forwarded to: "PTR_FORMAT" " |
|
75af3e8de182
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|
4164 "should not be in the CSet", |
|
75af3e8de182
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|
4165 (HeapWord*) old, (HeapWord*) forward_ptr)); |
| 342 | 4166 return forward_ptr; |
| 4167 } | |
| 4168 } | |
| 4169 | |
| 4170 void G1CollectedHeap::handle_evacuation_failure_common(oop old, markOop m) { | |
| 4171 set_evacuation_failed(true); | |
| 4172 | |
| 4173 preserve_mark_if_necessary(old, m); | |
| 4174 | |
| 4175 HeapRegion* r = heap_region_containing(old); | |
| 4176 if (!r->evacuation_failed()) { | |
| 4177 r->set_evacuation_failed(true); | |
|
3778
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7049999: G1: Make the G1PrintHeapRegions output consistent and complete
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|
4178 _hr_printer.evac_failure(r); |
| 342 | 4179 } |
| 4180 | |
| 4181 push_on_evac_failure_scan_stack(old); | |
| 4182 | |
| 4183 if (!_drain_in_progress) { | |
| 4184 // prevent recursion in copy_to_survivor_space() | |
| 4185 _drain_in_progress = true; | |
| 4186 drain_evac_failure_scan_stack(); | |
| 4187 _drain_in_progress = false; | |
| 4188 } | |
| 4189 } | |
| 4190 | |
| 4191 void G1CollectedHeap::preserve_mark_if_necessary(oop obj, markOop m) { | |
|
2038
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|
4192 assert(evacuation_failed(), "Oversaving!"); |
|
74ee0db180fa
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|
4193 // We want to call the "for_promotion_failure" version only in the |
|
74ee0db180fa
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|
4194 // case of a promotion failure. |
|
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|
4195 if (m->must_be_preserved_for_promotion_failure(obj)) { |
| 342 | 4196 if (_objs_with_preserved_marks == NULL) { |
| 4197 assert(_preserved_marks_of_objs == NULL, "Both or none."); | |
| 4198 _objs_with_preserved_marks = | |
| 4199 new (ResourceObj::C_HEAP) GrowableArray<oop>(40, true); | |
| 4200 _preserved_marks_of_objs = | |
| 4201 new (ResourceObj::C_HEAP) GrowableArray<markOop>(40, true); | |
| 4202 } | |
| 4203 _objs_with_preserved_marks->push(obj); | |
| 4204 _preserved_marks_of_objs->push(m); | |
| 4205 } | |
| 4206 } | |
| 4207 | |
| 4208 HeapWord* G1CollectedHeap::par_allocate_during_gc(GCAllocPurpose purpose, | |
| 4209 size_t word_size) { | |
|
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|
4210 if (purpose == GCAllocForSurvived) { |
|
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|
4211 HeapWord* result = survivor_attempt_allocation(word_size); |
|
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|
4212 if (result != NULL) { |
|
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|
4213 return result; |
| 342 | 4214 } else { |
|
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|
4215 // Let's try to allocate in the old gen in case we can fit the |
|
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|
4216 // object there. |
|
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|
4217 return old_attempt_allocation(word_size); |
| 342 | 4218 } |
|
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|
4219 } else { |
|
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|
4220 assert(purpose == GCAllocForTenured, "sanity"); |
|
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|
4221 HeapWord* result = old_attempt_allocation(word_size); |
|
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|
4222 if (result != NULL) { |
|
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|
4223 return result; |
| 342 | 4224 } else { |
|
3830
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|
4225 // Let's try to allocate in the survivors in case we can fit the |
|
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|
4226 // object there. |
|
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|
4227 return survivor_attempt_allocation(word_size); |
| 342 | 4228 } |
|
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|
4229 } |
|
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|
4230 |
|
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|
4231 ShouldNotReachHere(); |
|
f44782f04dd4
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changeset
|
4232 // Trying to keep some compilers happy. |
|
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|
4233 return NULL; |
| 342 | 4234 } |
| 4235 | |
|
3886
eeae91c9baba
7080389: G1: refactor marking code in evacuation pause copy closures
johnc
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3869
diff
changeset
|
4236 G1ParGCAllocBuffer::G1ParGCAllocBuffer(size_t gclab_word_size) : |
|
4787
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6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
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|
4237 ParGCAllocBuffer(gclab_word_size), _retired(false) { } |
|
3886
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|
4238 |
|
4836
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|
4239 G1ParScanThreadState::G1ParScanThreadState(G1CollectedHeap* g1h, uint queue_num) |
|
845
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|
4240 : _g1h(g1h), |
|
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|
4241 _refs(g1h->task_queue(queue_num)), |
|
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|
4242 _dcq(&g1h->dirty_card_queue_set()), |
|
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changeset
|
4243 _ct_bs((CardTableModRefBS*)_g1h->barrier_set()), |
|
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|
4244 _g1_rem(g1h->g1_rem_set()), |
|
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|
4245 _hash_seed(17), _queue_num(queue_num), |
|
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|
4246 _term_attempts(0), |
|
1391
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apetrusenko
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|
4247 _surviving_alloc_buffer(g1h->desired_plab_sz(GCAllocForSurvived)), |
|
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|
4248 _tenured_alloc_buffer(g1h->desired_plab_sz(GCAllocForTenured)), |
|
845
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|
4249 _age_table(false), |
|
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|
4250 _strong_roots_time(0), _term_time(0), |
|
4787
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6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
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|
4251 _alloc_buffer_waste(0), _undo_waste(0) { |
|
845
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|
4252 // we allocate G1YoungSurvRateNumRegions plus one entries, since |
|
df6caf649ff7
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|
4253 // we "sacrifice" entry 0 to keep track of surviving bytes for |
|
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|
4254 // non-young regions (where the age is -1) |
|
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|
4255 // We also add a few elements at the beginning and at the end in |
|
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|
4256 // an attempt to eliminate cache contention |
|
6010
720b6a76dd9d
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tonyp
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changeset
|
4257 uint real_length = 1 + _g1h->g1_policy()->young_cset_region_length(); |
|
720b6a76dd9d
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changeset
|
4258 uint array_length = PADDING_ELEM_NUM + |
|
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|
4259 real_length + |
|
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|
4260 PADDING_ELEM_NUM; |
|
845
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|
4261 _surviving_young_words_base = NEW_C_HEAP_ARRAY(size_t, array_length); |
|
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|
4262 if (_surviving_young_words_base == NULL) |
|
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|
4263 vm_exit_out_of_memory(array_length * sizeof(size_t), |
|
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|
4264 "Not enough space for young surv histo."); |
|
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|
4265 _surviving_young_words = _surviving_young_words_base + PADDING_ELEM_NUM; |
|
6010
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|
4266 memset(_surviving_young_words, 0, (size_t) real_length * sizeof(size_t)); |
|
845
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|
4267 |
|
1391
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changeset
|
4268 _alloc_buffers[GCAllocForSurvived] = &_surviving_alloc_buffer; |
|
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changeset
|
4269 _alloc_buffers[GCAllocForTenured] = &_tenured_alloc_buffer; |
|
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changeset
|
4270 |
|
845
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changeset
|
4271 _start = os::elapsedTime(); |
|
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|
4272 } |
| 342 | 4273 |
| 1709 | 4274 void |
| 4275 G1ParScanThreadState::print_termination_stats_hdr(outputStream* const st) | |
| 4276 { | |
| 4277 st->print_raw_cr("GC Termination Stats"); | |
| 4278 st->print_raw_cr(" elapsed --strong roots-- -------termination-------" | |
| 4279 " ------waste (KiB)------"); | |
| 4280 st->print_raw_cr("thr ms ms % ms % attempts" | |
| 4281 " total alloc undo"); | |
| 4282 st->print_raw_cr("--- --------- --------- ------ --------- ------ --------" | |
| 4283 " ------- ------- -------"); | |
| 4284 } | |
| 4285 | |
| 4286 void | |
| 4287 G1ParScanThreadState::print_termination_stats(int i, | |
| 4288 outputStream* const st) const | |
| 4289 { | |
| 4290 const double elapsed_ms = elapsed_time() * 1000.0; | |
| 4291 const double s_roots_ms = strong_roots_time() * 1000.0; | |
| 4292 const double term_ms = term_time() * 1000.0; | |
| 4293 st->print_cr("%3d %9.2f %9.2f %6.2f " | |
| 4294 "%9.2f %6.2f " SIZE_FORMAT_W(8) " " | |
| 4295 SIZE_FORMAT_W(7) " " SIZE_FORMAT_W(7) " " SIZE_FORMAT_W(7), | |
| 4296 i, elapsed_ms, s_roots_ms, s_roots_ms * 100 / elapsed_ms, | |
| 4297 term_ms, term_ms * 100 / elapsed_ms, term_attempts(), | |
| 4298 (alloc_buffer_waste() + undo_waste()) * HeapWordSize / K, | |
| 4299 alloc_buffer_waste() * HeapWordSize / K, | |
| 4300 undo_waste() * HeapWordSize / K); | |
| 4301 } | |
| 4302 | |
|
1862
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|
4303 #ifdef ASSERT |
|
b14ec34b1e07
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changeset
|
4304 bool G1ParScanThreadState::verify_ref(narrowOop* ref) const { |
|
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diff
changeset
|
4305 assert(ref != NULL, "invariant"); |
|
b14ec34b1e07
6989448: G1: refactor and simplify G1ParScanThreadState
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parents:
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diff
changeset
|
4306 assert(UseCompressedOops, "sanity"); |
|
b14ec34b1e07
6989448: G1: refactor and simplify G1ParScanThreadState
jcoomes
parents:
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diff
changeset
|
4307 assert(!has_partial_array_mask(ref), err_msg("ref=" PTR_FORMAT, ref)); |
|
b14ec34b1e07
6989448: G1: refactor and simplify G1ParScanThreadState
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changeset
|
4308 oop p = oopDesc::load_decode_heap_oop(ref); |
|
b14ec34b1e07
6989448: G1: refactor and simplify G1ParScanThreadState
jcoomes
parents:
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diff
changeset
|
4309 assert(_g1h->is_in_g1_reserved(p), |
|
b14ec34b1e07
6989448: G1: refactor and simplify G1ParScanThreadState
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parents:
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diff
changeset
|
4310 err_msg("ref=" PTR_FORMAT " p=" PTR_FORMAT, ref, intptr_t(p))); |
|
b14ec34b1e07
6989448: G1: refactor and simplify G1ParScanThreadState
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parents:
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diff
changeset
|
4311 return true; |
|
b14ec34b1e07
6989448: G1: refactor and simplify G1ParScanThreadState
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parents:
1861
diff
changeset
|
4312 } |
|
b14ec34b1e07
6989448: G1: refactor and simplify G1ParScanThreadState
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parents:
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diff
changeset
|
4313 |
|
b14ec34b1e07
6989448: G1: refactor and simplify G1ParScanThreadState
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parents:
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diff
changeset
|
4314 bool G1ParScanThreadState::verify_ref(oop* ref) const { |
|
b14ec34b1e07
6989448: G1: refactor and simplify G1ParScanThreadState
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parents:
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diff
changeset
|
4315 assert(ref != NULL, "invariant"); |
|
b14ec34b1e07
6989448: G1: refactor and simplify G1ParScanThreadState
jcoomes
parents:
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diff
changeset
|
4316 if (has_partial_array_mask(ref)) { |
|
b14ec34b1e07
6989448: G1: refactor and simplify G1ParScanThreadState
jcoomes
parents:
1861
diff
changeset
|
4317 // Must be in the collection set--it's already been copied. |
|
b14ec34b1e07
6989448: G1: refactor and simplify G1ParScanThreadState
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parents:
1861
diff
changeset
|
4318 oop p = clear_partial_array_mask(ref); |
|
b14ec34b1e07
6989448: G1: refactor and simplify G1ParScanThreadState
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parents:
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diff
changeset
|
4319 assert(_g1h->obj_in_cs(p), |
|
b14ec34b1e07
6989448: G1: refactor and simplify G1ParScanThreadState
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parents:
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diff
changeset
|
4320 err_msg("ref=" PTR_FORMAT " p=" PTR_FORMAT, ref, intptr_t(p))); |
|
b14ec34b1e07
6989448: G1: refactor and simplify G1ParScanThreadState
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parents:
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diff
changeset
|
4321 } else { |
|
b14ec34b1e07
6989448: G1: refactor and simplify G1ParScanThreadState
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diff
changeset
|
4322 oop p = oopDesc::load_decode_heap_oop(ref); |
|
b14ec34b1e07
6989448: G1: refactor and simplify G1ParScanThreadState
jcoomes
parents:
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diff
changeset
|
4323 assert(_g1h->is_in_g1_reserved(p), |
|
b14ec34b1e07
6989448: G1: refactor and simplify G1ParScanThreadState
jcoomes
parents:
1861
diff
changeset
|
4324 err_msg("ref=" PTR_FORMAT " p=" PTR_FORMAT, ref, intptr_t(p))); |
|
b14ec34b1e07
6989448: G1: refactor and simplify G1ParScanThreadState
jcoomes
parents:
1861
diff
changeset
|
4325 } |
|
b14ec34b1e07
6989448: G1: refactor and simplify G1ParScanThreadState
jcoomes
parents:
1861
diff
changeset
|
4326 return true; |
|
b14ec34b1e07
6989448: G1: refactor and simplify G1ParScanThreadState
jcoomes
parents:
1861
diff
changeset
|
4327 } |
|
b14ec34b1e07
6989448: G1: refactor and simplify G1ParScanThreadState
jcoomes
parents:
1861
diff
changeset
|
4328 |
|
b14ec34b1e07
6989448: G1: refactor and simplify G1ParScanThreadState
jcoomes
parents:
1861
diff
changeset
|
4329 bool G1ParScanThreadState::verify_task(StarTask ref) const { |
|
b14ec34b1e07
6989448: G1: refactor and simplify G1ParScanThreadState
jcoomes
parents:
1861
diff
changeset
|
4330 if (ref.is_narrow()) { |
|
b14ec34b1e07
6989448: G1: refactor and simplify G1ParScanThreadState
jcoomes
parents:
1861
diff
changeset
|
4331 return verify_ref((narrowOop*) ref); |
|
b14ec34b1e07
6989448: G1: refactor and simplify G1ParScanThreadState
jcoomes
parents:
1861
diff
changeset
|
4332 } else { |
|
b14ec34b1e07
6989448: G1: refactor and simplify G1ParScanThreadState
jcoomes
parents:
1861
diff
changeset
|
4333 return verify_ref((oop*) ref); |
|
b14ec34b1e07
6989448: G1: refactor and simplify G1ParScanThreadState
jcoomes
parents:
1861
diff
changeset
|
4334 } |
|
b14ec34b1e07
6989448: G1: refactor and simplify G1ParScanThreadState
jcoomes
parents:
1861
diff
changeset
|
4335 } |
|
b14ec34b1e07
6989448: G1: refactor and simplify G1ParScanThreadState
jcoomes
parents:
1861
diff
changeset
|
4336 #endif // ASSERT |
|
b14ec34b1e07
6989448: G1: refactor and simplify G1ParScanThreadState
jcoomes
parents:
1861
diff
changeset
|
4337 |
|
b14ec34b1e07
6989448: G1: refactor and simplify G1ParScanThreadState
jcoomes
parents:
1861
diff
changeset
|
4338 void G1ParScanThreadState::trim_queue() { |
|
3979
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
4339 assert(_evac_cl != NULL, "not set"); |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
4340 assert(_evac_failure_cl != NULL, "not set"); |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
4341 assert(_partial_scan_cl != NULL, "not set"); |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
4342 |
|
1862
b14ec34b1e07
6989448: G1: refactor and simplify G1ParScanThreadState
jcoomes
parents:
1861
diff
changeset
|
4343 StarTask ref; |
|
b14ec34b1e07
6989448: G1: refactor and simplify G1ParScanThreadState
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parents:
1861
diff
changeset
|
4344 do { |
|
b14ec34b1e07
6989448: G1: refactor and simplify G1ParScanThreadState
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parents:
1861
diff
changeset
|
4345 // Drain the overflow stack first, so other threads can steal. |
|
b14ec34b1e07
6989448: G1: refactor and simplify G1ParScanThreadState
jcoomes
parents:
1861
diff
changeset
|
4346 while (refs()->pop_overflow(ref)) { |
|
b14ec34b1e07
6989448: G1: refactor and simplify G1ParScanThreadState
jcoomes
parents:
1861
diff
changeset
|
4347 deal_with_reference(ref); |
|
b14ec34b1e07
6989448: G1: refactor and simplify G1ParScanThreadState
jcoomes
parents:
1861
diff
changeset
|
4348 } |
|
3979
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
4349 |
|
1862
b14ec34b1e07
6989448: G1: refactor and simplify G1ParScanThreadState
jcoomes
parents:
1861
diff
changeset
|
4350 while (refs()->pop_local(ref)) { |
|
b14ec34b1e07
6989448: G1: refactor and simplify G1ParScanThreadState
jcoomes
parents:
1861
diff
changeset
|
4351 deal_with_reference(ref); |
|
b14ec34b1e07
6989448: G1: refactor and simplify G1ParScanThreadState
jcoomes
parents:
1861
diff
changeset
|
4352 } |
|
b14ec34b1e07
6989448: G1: refactor and simplify G1ParScanThreadState
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parents:
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diff
changeset
|
4353 } while (!refs()->is_empty()); |
|
b14ec34b1e07
6989448: G1: refactor and simplify G1ParScanThreadState
jcoomes
parents:
1861
diff
changeset
|
4354 } |
|
b14ec34b1e07
6989448: G1: refactor and simplify G1ParScanThreadState
jcoomes
parents:
1861
diff
changeset
|
4355 |
|
4787
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
4785
diff
changeset
|
4356 G1ParClosureSuper::G1ParClosureSuper(G1CollectedHeap* g1, |
|
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
4785
diff
changeset
|
4357 G1ParScanThreadState* par_scan_state) : |
| 342 | 4358 _g1(g1), _g1_rem(_g1->g1_rem_set()), _cm(_g1->concurrent_mark()), |
|
3886
eeae91c9baba
7080389: G1: refactor marking code in evacuation pause copy closures
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parents:
3869
diff
changeset
|
4359 _par_scan_state(par_scan_state), |
|
4836
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4834
diff
changeset
|
4360 _worker_id(par_scan_state->queue_num()), |
|
3886
eeae91c9baba
7080389: G1: refactor marking code in evacuation pause copy closures
johnc
parents:
3869
diff
changeset
|
4361 _during_initial_mark(_g1->g1_policy()->during_initial_mark_pause()), |
|
eeae91c9baba
7080389: G1: refactor marking code in evacuation pause copy closures
johnc
parents:
3869
diff
changeset
|
4362 _mark_in_progress(_g1->mark_in_progress()) { } |
|
eeae91c9baba
7080389: G1: refactor marking code in evacuation pause copy closures
johnc
parents:
3869
diff
changeset
|
4363 |
| 5987 | 4364 template <bool do_gen_barrier, G1Barrier barrier, bool do_mark_object> |
| 4365 void G1ParCopyClosure<do_gen_barrier, barrier, do_mark_object>::mark_object(oop obj) { | |
|
4787
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
4785
diff
changeset
|
4366 #ifdef ASSERT |
|
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
4785
diff
changeset
|
4367 HeapRegion* hr = _g1->heap_region_containing(obj); |
|
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
4785
diff
changeset
|
4368 assert(hr != NULL, "sanity"); |
|
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
4785
diff
changeset
|
4369 assert(!hr->in_collection_set(), "should not mark objects in the CSet"); |
|
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
4785
diff
changeset
|
4370 #endif // ASSERT |
|
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
4785
diff
changeset
|
4371 |
|
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
4785
diff
changeset
|
4372 // We know that the object is not moving so it's safe to read its size. |
|
4836
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4834
diff
changeset
|
4373 _cm->grayRoot(obj, (size_t) obj->size(), _worker_id); |
|
4787
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6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
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|
4374 } |
|
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|
4375 |
| 5987 | 4376 template <bool do_gen_barrier, G1Barrier barrier, bool do_mark_object> |
| 4377 void G1ParCopyClosure<do_gen_barrier, barrier, do_mark_object> | |
| 4378 ::mark_forwarded_object(oop from_obj, oop to_obj) { | |
|
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|
4379 #ifdef ASSERT |
|
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|
4380 assert(from_obj->is_forwarded(), "from obj should be forwarded"); |
|
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|
4381 assert(from_obj->forwardee() == to_obj, "to obj should be the forwardee"); |
|
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|
4382 assert(from_obj != to_obj, "should not be self-forwarded"); |
|
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|
4383 |
|
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|
4384 HeapRegion* from_hr = _g1->heap_region_containing(from_obj); |
|
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|
4385 assert(from_hr != NULL, "sanity"); |
|
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|
4386 assert(from_hr->in_collection_set(), "from obj should be in the CSet"); |
|
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4387 |
|
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|
4388 HeapRegion* to_hr = _g1->heap_region_containing(to_obj); |
|
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|
4389 assert(to_hr != NULL, "sanity"); |
|
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|
4390 assert(!to_hr->in_collection_set(), "should not mark objects in the CSet"); |
|
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|
4391 #endif // ASSERT |
|
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|
4392 |
|
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|
4393 // The object might be in the process of being copied by another |
|
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|
4394 // worker so we cannot trust that its to-space image is |
|
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|
4395 // well-formed. So we have to read its size from its from-space |
|
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|
4396 // image which we know should not be changing. |
|
4836
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|
4397 _cm->grayRoot(to_obj, (size_t) from_obj->size(), _worker_id); |
|
4787
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|
4398 } |
|
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|
4399 |
| 5987 | 4400 template <bool do_gen_barrier, G1Barrier barrier, bool do_mark_object> |
| 4401 oop G1ParCopyClosure<do_gen_barrier, barrier, do_mark_object> | |
| 4402 ::copy_to_survivor_space(oop old) { | |
|
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|
4403 size_t word_sz = old->size(); |
| 342 | 4404 HeapRegion* from_region = _g1->heap_region_containing_raw(old); |
| 4405 // +1 to make the -1 indexes valid... | |
| 4406 int young_index = from_region->young_index_in_cset()+1; | |
|
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4407 assert( (from_region->is_young() && young_index > 0) || |
|
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|
4408 (!from_region->is_young() && young_index == 0), "invariant" ); |
| 342 | 4409 G1CollectorPolicy* g1p = _g1->g1_policy(); |
| 4410 markOop m = old->mark(); | |
| 545 | 4411 int age = m->has_displaced_mark_helper() ? m->displaced_mark_helper()->age() |
| 4412 : m->age(); | |
| 4413 GCAllocPurpose alloc_purpose = g1p->evacuation_destination(from_region, age, | |
| 342 | 4414 word_sz); |
| 4415 HeapWord* obj_ptr = _par_scan_state->allocate(alloc_purpose, word_sz); | |
| 4416 oop obj = oop(obj_ptr); | |
| 4417 | |
| 4418 if (obj_ptr == NULL) { | |
| 4419 // This will either forward-to-self, or detect that someone else has | |
| 4420 // installed a forwarding pointer. | |
| 4421 OopsInHeapRegionClosure* cl = _par_scan_state->evac_failure_closure(); | |
|
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|
4422 return _g1->handle_evacuation_failure_par(cl, old); |
| 342 | 4423 } |
| 4424 | |
| 526 | 4425 // We're going to allocate linearly, so might as well prefetch ahead. |
| 4426 Prefetch::write(obj_ptr, PrefetchCopyIntervalInBytes); | |
| 4427 | |
| 342 | 4428 oop forward_ptr = old->forward_to_atomic(obj); |
| 4429 if (forward_ptr == NULL) { | |
| 4430 Copy::aligned_disjoint_words((HeapWord*) old, obj_ptr, word_sz); | |
| 526 | 4431 if (g1p->track_object_age(alloc_purpose)) { |
| 4432 // We could simply do obj->incr_age(). However, this causes a | |
| 4433 // performance issue. obj->incr_age() will first check whether | |
| 4434 // the object has a displaced mark by checking its mark word; | |
| 4435 // getting the mark word from the new location of the object | |
| 4436 // stalls. So, given that we already have the mark word and we | |
| 4437 // are about to install it anyway, it's better to increase the | |
| 4438 // age on the mark word, when the object does not have a | |
| 4439 // displaced mark word. We're not expecting many objects to have | |
| 4440 // a displaced marked word, so that case is not optimized | |
| 4441 // further (it could be...) and we simply call obj->incr_age(). | |
| 4442 | |
| 4443 if (m->has_displaced_mark_helper()) { | |
| 4444 // in this case, we have to install the mark word first, | |
| 4445 // otherwise obj looks to be forwarded (the old mark word, | |
| 4446 // which contains the forward pointer, was copied) | |
| 4447 obj->set_mark(m); | |
| 4448 obj->incr_age(); | |
| 4449 } else { | |
| 4450 m = m->incr_age(); | |
| 545 | 4451 obj->set_mark(m); |
| 526 | 4452 } |
| 545 | 4453 _par_scan_state->age_table()->add(obj, word_sz); |
| 4454 } else { | |
| 4455 obj->set_mark(m); | |
| 526 | 4456 } |
| 4457 | |
| 342 | 4458 size_t* surv_young_words = _par_scan_state->surviving_young_words(); |
| 4459 surv_young_words[young_index] += word_sz; | |
| 4460 | |
| 4461 if (obj->is_objArray() && arrayOop(obj)->length() >= ParGCArrayScanChunk) { | |
|
4784
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|
4462 // We keep track of the next start index in the length field of |
|
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|
4463 // the to-space object. The actual length can be found in the |
|
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|
4464 // length field of the from-space object. |
|
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|
4465 arrayOop(obj)->set_length(0); |
|
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|
4466 oop* old_p = set_partial_array_mask(old); |
|
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4467 _par_scan_state->push_on_queue(old_p); |
| 342 | 4468 } else { |
| 526 | 4469 // No point in using the slower heap_region_containing() method, |
| 4470 // given that we know obj is in the heap. | |
| 5987 | 4471 _scanner.set_region(_g1->heap_region_containing_raw(obj)); |
| 4472 obj->oop_iterate_backwards(&_scanner); | |
| 342 | 4473 } |
| 4474 } else { | |
| 4475 _par_scan_state->undo_allocation(alloc_purpose, obj_ptr, word_sz); | |
| 4476 obj = forward_ptr; | |
| 4477 } | |
| 4478 return obj; | |
| 4479 } | |
| 4480 | |
|
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|
4481 template <bool do_gen_barrier, G1Barrier barrier, bool do_mark_object> |
|
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|
4482 template <class T> |
|
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|
4483 void G1ParCopyClosure<do_gen_barrier, barrier, do_mark_object> |
|
845
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|
4484 ::do_oop_work(T* p) { |
|
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|
4485 oop obj = oopDesc::load_decode_heap_oop(p); |
| 342 | 4486 assert(barrier != G1BarrierRS || obj != NULL, |
|
4787
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|
4487 "Precondition: G1BarrierRS implies obj is non-NULL"); |
|
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|
4488 |
|
4836
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|
4489 assert(_worker_id == _par_scan_state->queue_num(), "sanity"); |
|
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|
4490 |
| 526 | 4491 // here the null check is implicit in the cset_fast_test() test |
|
1261
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|
4492 if (_g1->in_cset_fast_test(obj)) { |
|
4787
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|
4493 oop forwardee; |
| 526 | 4494 if (obj->is_forwarded()) { |
|
4787
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|
4495 forwardee = obj->forwardee(); |
| 526 | 4496 } else { |
|
4787
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|
4497 forwardee = copy_to_survivor_space(obj); |
| 342 | 4498 } |
|
4787
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|
4499 assert(forwardee != NULL, "forwardee should not be NULL"); |
|
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|
4500 oopDesc::encode_store_heap_oop(p, forwardee); |
|
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|
4501 if (do_mark_object && forwardee != obj) { |
|
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|
4502 // If the object is self-forwarded we don't need to explicitly |
|
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|
4503 // mark it, the evacuation failure protocol will do so. |
|
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|
4504 mark_forwarded_object(obj, forwardee); |
|
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|
4505 } |
|
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|
4506 |
| 526 | 4507 // When scanning the RS, we only care about objs in CS. |
| 4508 if (barrier == G1BarrierRS) { | |
|
4836
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|
4509 _par_scan_state->update_rs(_from, p, _worker_id); |
| 342 | 4510 } |
|
3886
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|
4511 } else { |
|
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|
4512 // The object is not in collection set. If we're a root scanning |
|
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|
4513 // closure during an initial mark pause (i.e. do_mark_object will |
|
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|
4514 // be true) then attempt to mark the object. |
|
4787
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|
4515 if (do_mark_object && _g1->is_in_g1_reserved(obj)) { |
|
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|
4516 mark_object(obj); |
|
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|
4517 } |
| 526 | 4518 } |
| 4519 | |
| 4520 if (barrier == G1BarrierEvac && obj != NULL) { | |
|
4836
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|
4521 _par_scan_state->update_rs(_from, p, _worker_id); |
| 526 | 4522 } |
| 4523 | |
| 4524 if (do_gen_barrier && obj != NULL) { | |
| 4525 par_do_barrier(p); | |
| 4526 } | |
| 4527 } | |
| 4528 | |
|
1261
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|
4529 template void G1ParCopyClosure<false, G1BarrierEvac, false>::do_oop_work(oop* p); |
|
0414c1049f15
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|
4530 template void G1ParCopyClosure<false, G1BarrierEvac, false>::do_oop_work(narrowOop* p); |
|
845
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|
4531 |
|
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|
4532 template <class T> void G1ParScanPartialArrayClosure::do_oop_nv(T* p) { |
| 526 | 4533 assert(has_partial_array_mask(p), "invariant"); |
|
4784
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|
4534 oop from_obj = clear_partial_array_mask(p); |
|
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|
4535 |
|
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|
4536 assert(Universe::heap()->is_in_reserved(from_obj), "must be in heap."); |
|
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|
4537 assert(from_obj->is_objArray(), "must be obj array"); |
|
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|
4538 objArrayOop from_obj_array = objArrayOop(from_obj); |
|
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|
4539 // The from-space object contains the real length. |
|
02838862dec8
7121623: G1: always be able to reliably calculate the length of a forwarded chunked array
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|
4540 int length = from_obj_array->length(); |
|
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|
4541 |
|
02838862dec8
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|
4542 assert(from_obj->is_forwarded(), "must be forwarded"); |
|
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|
4543 oop to_obj = from_obj->forwardee(); |
|
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|
4544 assert(from_obj != to_obj, "should not be chunking self-forwarded objects"); |
|
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|
4545 objArrayOop to_obj_array = objArrayOop(to_obj); |
|
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|
4546 // We keep track of the next start index in the length field of the |
|
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|
4547 // to-space object. |
|
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|
4548 int next_index = to_obj_array->length(); |
|
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changeset
|
4549 assert(0 <= next_index && next_index < length, |
|
02838862dec8
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|
4550 err_msg("invariant, next index: %d, length: %d", next_index, length)); |
|
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|
4551 |
|
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|
4552 int start = next_index; |
|
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|
4553 int end = length; |
|
02838862dec8
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|
4554 int remainder = end - start; |
|
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changeset
|
4555 // We'll try not to push a range that's smaller than ParGCArrayScanChunk. |
| 342 | 4556 if (remainder > 2 * ParGCArrayScanChunk) { |
| 4557 end = start + ParGCArrayScanChunk; | |
|
4784
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|
4558 to_obj_array->set_length(end); |
|
02838862dec8
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|
4559 // Push the remainder before we process the range in case another |
|
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7121623: G1: always be able to reliably calculate the length of a forwarded chunked array
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|
4560 // worker has run out of things to do and can steal it. |
|
02838862dec8
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|
4561 oop* from_obj_p = set_partial_array_mask(from_obj); |
|
02838862dec8
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|
4562 _par_scan_state->push_on_queue(from_obj_p); |
| 342 | 4563 } else { |
|
4784
02838862dec8
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|
4564 assert(length == end, "sanity"); |
|
02838862dec8
7121623: G1: always be able to reliably calculate the length of a forwarded chunked array
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|
4565 // We'll process the final range for this object. Restore the length |
|
02838862dec8
7121623: G1: always be able to reliably calculate the length of a forwarded chunked array
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|
4566 // so that the heap remains parsable in case of evacuation failure. |
|
02838862dec8
7121623: G1: always be able to reliably calculate the length of a forwarded chunked array
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|
4567 to_obj_array->set_length(end); |
|
02838862dec8
7121623: G1: always be able to reliably calculate the length of a forwarded chunked array
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|
4568 } |
|
02838862dec8
7121623: G1: always be able to reliably calculate the length of a forwarded chunked array
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|
4569 _scanner.set_region(_g1->heap_region_containing_raw(to_obj)); |
|
02838862dec8
7121623: G1: always be able to reliably calculate the length of a forwarded chunked array
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|
4570 // Process indexes [start,end). It will also process the header |
|
02838862dec8
7121623: G1: always be able to reliably calculate the length of a forwarded chunked array
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|
4571 // along with the first chunk (i.e., the chunk with start == 0). |
|
02838862dec8
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|
4572 // Note that at this point the length field of to_obj_array is not |
|
02838862dec8
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|
4573 // correct given that we are using it to keep track of the next |
|
02838862dec8
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|
4574 // start index. oop_iterate_range() (thankfully!) ignores the length |
|
02838862dec8
7121623: G1: always be able to reliably calculate the length of a forwarded chunked array
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|
4575 // field and only relies on the start / end parameters. It does |
|
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7121623: G1: always be able to reliably calculate the length of a forwarded chunked array
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|
4576 // however return the size of the object which will be incorrect. So |
|
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|
4577 // we have to ignore it even if we wanted to use it. |
|
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|
4578 to_obj_array->oop_iterate_range(&_scanner, start, end); |
| 342 | 4579 } |
| 4580 | |
| 4581 class G1ParEvacuateFollowersClosure : public VoidClosure { | |
| 4582 protected: | |
| 4583 G1CollectedHeap* _g1h; | |
| 4584 G1ParScanThreadState* _par_scan_state; | |
| 4585 RefToScanQueueSet* _queues; | |
| 4586 ParallelTaskTerminator* _terminator; | |
| 4587 | |
| 4588 G1ParScanThreadState* par_scan_state() { return _par_scan_state; } | |
| 4589 RefToScanQueueSet* queues() { return _queues; } | |
| 4590 ParallelTaskTerminator* terminator() { return _terminator; } | |
| 4591 | |
| 4592 public: | |
| 4593 G1ParEvacuateFollowersClosure(G1CollectedHeap* g1h, | |
| 4594 G1ParScanThreadState* par_scan_state, | |
| 4595 RefToScanQueueSet* queues, | |
| 4596 ParallelTaskTerminator* terminator) | |
| 4597 : _g1h(g1h), _par_scan_state(par_scan_state), | |
| 4598 _queues(queues), _terminator(terminator) {} | |
| 4599 | |
|
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|
4600 void do_void(); |
|
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|
4601 |
|
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|
4602 private: |
|
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|
4603 inline bool offer_termination(); |
|
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|
4604 }; |
|
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|
4605 |
|
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|
4606 bool G1ParEvacuateFollowersClosure::offer_termination() { |
|
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|
4607 G1ParScanThreadState* const pss = par_scan_state(); |
|
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|
4608 pss->start_term_time(); |
|
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|
4609 const bool res = terminator()->offer_termination(); |
|
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|
4610 pss->end_term_time(); |
|
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|
4611 return res; |
|
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|
4612 } |
|
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|
4613 |
|
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6989448: G1: refactor and simplify G1ParScanThreadState
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|
4614 void G1ParEvacuateFollowersClosure::do_void() { |
|
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|
4615 StarTask stolen_task; |
|
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|
4616 G1ParScanThreadState* const pss = par_scan_state(); |
|
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|
4617 pss->trim_queue(); |
|
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6989448: G1: refactor and simplify G1ParScanThreadState
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|
4618 |
|
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|
4619 do { |
|
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|
4620 while (queues()->steal(pss->queue_num(), pss->hash_seed(), stolen_task)) { |
|
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|
4621 assert(pss->verify_task(stolen_task), "sanity"); |
|
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|
4622 if (stolen_task.is_narrow()) { |
|
1883
35e4e086d5f5
6990359: G1: don't push a stolen entry on the taskqueue, deal with it directly
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diff
changeset
|
4623 pss->deal_with_reference((narrowOop*) stolen_task); |
|
1862
b14ec34b1e07
6989448: G1: refactor and simplify G1ParScanThreadState
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diff
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|
4624 } else { |
|
1883
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6990359: G1: don't push a stolen entry on the taskqueue, deal with it directly
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diff
changeset
|
4625 pss->deal_with_reference((oop*) stolen_task); |
|
1862
b14ec34b1e07
6989448: G1: refactor and simplify G1ParScanThreadState
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|
4626 } |
|
1883
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6990359: G1: don't push a stolen entry on the taskqueue, deal with it directly
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changeset
|
4627 |
|
35e4e086d5f5
6990359: G1: don't push a stolen entry on the taskqueue, deal with it directly
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diff
changeset
|
4628 // We've just processed a reference and we might have made |
|
35e4e086d5f5
6990359: G1: don't push a stolen entry on the taskqueue, deal with it directly
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diff
changeset
|
4629 // available new entries on the queues. So we have to make sure |
|
35e4e086d5f5
6990359: G1: don't push a stolen entry on the taskqueue, deal with it directly
tonyp
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diff
changeset
|
4630 // we drain the queues as necessary. |
| 342 | 4631 pss->trim_queue(); |
| 4632 } | |
|
1862
b14ec34b1e07
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jcoomes
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diff
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|
4633 } while (!offer_termination()); |
|
b14ec34b1e07
6989448: G1: refactor and simplify G1ParScanThreadState
jcoomes
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diff
changeset
|
4634 |
|
b14ec34b1e07
6989448: G1: refactor and simplify G1ParScanThreadState
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diff
changeset
|
4635 pss->retire_alloc_buffers(); |
|
b14ec34b1e07
6989448: G1: refactor and simplify G1ParScanThreadState
jcoomes
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diff
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|
4636 } |
| 342 | 4637 |
| 4638 class G1ParTask : public AbstractGangTask { | |
| 4639 protected: | |
| 4640 G1CollectedHeap* _g1h; | |
| 4641 RefToScanQueueSet *_queues; | |
| 4642 ParallelTaskTerminator _terminator; | |
|
4728
441e946dc1af
7121618: Change type of number of GC workers to unsigned int.
jmasa
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4711
diff
changeset
|
4643 uint _n_workers; |
| 342 | 4644 |
| 4645 Mutex _stats_lock; | |
| 4646 Mutex* stats_lock() { return &_stats_lock; } | |
| 4647 | |
| 4648 size_t getNCards() { | |
| 4649 return (_g1h->capacity() + G1BlockOffsetSharedArray::N_bytes - 1) | |
| 4650 / G1BlockOffsetSharedArray::N_bytes; | |
| 4651 } | |
| 4652 | |
| 4653 public: | |
|
4095
bca17e38de00
6593758: RFE: Enhance GC ergonomics to dynamically choose ParallelGCThreads
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diff
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|
4654 G1ParTask(G1CollectedHeap* g1h, |
|
bca17e38de00
6593758: RFE: Enhance GC ergonomics to dynamically choose ParallelGCThreads
jmasa
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diff
changeset
|
4655 RefToScanQueueSet *task_queues) |
| 342 | 4656 : AbstractGangTask("G1 collection"), |
| 4657 _g1h(g1h), | |
| 4658 _queues(task_queues), | |
|
4095
bca17e38de00
6593758: RFE: Enhance GC ergonomics to dynamically choose ParallelGCThreads
jmasa
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diff
changeset
|
4659 _terminator(0, _queues), |
|
bca17e38de00
6593758: RFE: Enhance GC ergonomics to dynamically choose ParallelGCThreads
jmasa
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4090
diff
changeset
|
4660 _stats_lock(Mutex::leaf, "parallel G1 stats lock", true) |
| 342 | 4661 {} |
| 4662 | |
| 4663 RefToScanQueueSet* queues() { return _queues; } | |
| 4664 | |
| 4665 RefToScanQueue *work_queue(int i) { | |
| 4666 return queues()->queue(i); | |
| 4667 } | |
| 4668 | |
|
4095
bca17e38de00
6593758: RFE: Enhance GC ergonomics to dynamically choose ParallelGCThreads
jmasa
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4090
diff
changeset
|
4669 ParallelTaskTerminator* terminator() { return &_terminator; } |
|
bca17e38de00
6593758: RFE: Enhance GC ergonomics to dynamically choose ParallelGCThreads
jmasa
parents:
4090
diff
changeset
|
4670 |
|
bca17e38de00
6593758: RFE: Enhance GC ergonomics to dynamically choose ParallelGCThreads
jmasa
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4090
diff
changeset
|
4671 virtual void set_for_termination(int active_workers) { |
|
bca17e38de00
6593758: RFE: Enhance GC ergonomics to dynamically choose ParallelGCThreads
jmasa
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4090
diff
changeset
|
4672 // This task calls set_n_termination() in par_non_clean_card_iterate_work() |
|
bca17e38de00
6593758: RFE: Enhance GC ergonomics to dynamically choose ParallelGCThreads
jmasa
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4090
diff
changeset
|
4673 // in the young space (_par_seq_tasks) in the G1 heap |
|
bca17e38de00
6593758: RFE: Enhance GC ergonomics to dynamically choose ParallelGCThreads
jmasa
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4090
diff
changeset
|
4674 // for SequentialSubTasksDone. |
|
bca17e38de00
6593758: RFE: Enhance GC ergonomics to dynamically choose ParallelGCThreads
jmasa
parents:
4090
diff
changeset
|
4675 // This task also uses SubTasksDone in SharedHeap and G1CollectedHeap |
|
bca17e38de00
6593758: RFE: Enhance GC ergonomics to dynamically choose ParallelGCThreads
jmasa
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4090
diff
changeset
|
4676 // both of which need setting by set_n_termination(). |
|
bca17e38de00
6593758: RFE: Enhance GC ergonomics to dynamically choose ParallelGCThreads
jmasa
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4090
diff
changeset
|
4677 _g1h->SharedHeap::set_n_termination(active_workers); |
|
bca17e38de00
6593758: RFE: Enhance GC ergonomics to dynamically choose ParallelGCThreads
jmasa
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4090
diff
changeset
|
4678 _g1h->set_n_termination(active_workers); |
|
bca17e38de00
6593758: RFE: Enhance GC ergonomics to dynamically choose ParallelGCThreads
jmasa
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4090
diff
changeset
|
4679 terminator()->reset_for_reuse(active_workers); |
|
bca17e38de00
6593758: RFE: Enhance GC ergonomics to dynamically choose ParallelGCThreads
jmasa
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4090
diff
changeset
|
4680 _n_workers = active_workers; |
|
bca17e38de00
6593758: RFE: Enhance GC ergonomics to dynamically choose ParallelGCThreads
jmasa
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4090
diff
changeset
|
4681 } |
|
bca17e38de00
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4090
diff
changeset
|
4682 |
|
4728
441e946dc1af
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jmasa
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4711
diff
changeset
|
4683 void work(uint worker_id) { |
|
441e946dc1af
7121618: Change type of number of GC workers to unsigned int.
jmasa
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4711
diff
changeset
|
4684 if (worker_id >= _n_workers) return; // no work needed this round |
| 1611 | 4685 |
| 4686 double start_time_ms = os::elapsedTime() * 1000.0; | |
|
4728
441e946dc1af
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jmasa
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4711
diff
changeset
|
4687 _g1h->g1_policy()->record_gc_worker_start_time(worker_id, start_time_ms); |
| 1611 | 4688 |
|
5986
500023bd0818
7143511: G1: Another instance of high GC Worker Other time (50ms)
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5963
diff
changeset
|
4689 { |
|
500023bd0818
7143511: G1: Another instance of high GC Worker Other time (50ms)
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5963
diff
changeset
|
4690 ResourceMark rm; |
|
500023bd0818
7143511: G1: Another instance of high GC Worker Other time (50ms)
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5963
diff
changeset
|
4691 HandleMark hm; |
|
500023bd0818
7143511: G1: Another instance of high GC Worker Other time (50ms)
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5963
diff
changeset
|
4692 |
|
500023bd0818
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diff
changeset
|
4693 ReferenceProcessor* rp = _g1h->ref_processor_stw(); |
|
500023bd0818
7143511: G1: Another instance of high GC Worker Other time (50ms)
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5963
diff
changeset
|
4694 |
|
500023bd0818
7143511: G1: Another instance of high GC Worker Other time (50ms)
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5963
diff
changeset
|
4695 G1ParScanThreadState pss(_g1h, worker_id); |
|
500023bd0818
7143511: G1: Another instance of high GC Worker Other time (50ms)
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5963
diff
changeset
|
4696 G1ParScanHeapEvacClosure scan_evac_cl(_g1h, &pss, rp); |
|
500023bd0818
7143511: G1: Another instance of high GC Worker Other time (50ms)
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5963
diff
changeset
|
4697 G1ParScanHeapEvacFailureClosure evac_failure_cl(_g1h, &pss, rp); |
|
500023bd0818
7143511: G1: Another instance of high GC Worker Other time (50ms)
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5963
diff
changeset
|
4698 G1ParScanPartialArrayClosure partial_scan_cl(_g1h, &pss, rp); |
|
500023bd0818
7143511: G1: Another instance of high GC Worker Other time (50ms)
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diff
changeset
|
4699 |
|
500023bd0818
7143511: G1: Another instance of high GC Worker Other time (50ms)
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5963
diff
changeset
|
4700 pss.set_evac_closure(&scan_evac_cl); |
|
500023bd0818
7143511: G1: Another instance of high GC Worker Other time (50ms)
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5963
diff
changeset
|
4701 pss.set_evac_failure_closure(&evac_failure_cl); |
|
500023bd0818
7143511: G1: Another instance of high GC Worker Other time (50ms)
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5963
diff
changeset
|
4702 pss.set_partial_scan_closure(&partial_scan_cl); |
|
500023bd0818
7143511: G1: Another instance of high GC Worker Other time (50ms)
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5963
diff
changeset
|
4703 |
|
500023bd0818
7143511: G1: Another instance of high GC Worker Other time (50ms)
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5963
diff
changeset
|
4704 G1ParScanExtRootClosure only_scan_root_cl(_g1h, &pss, rp); |
|
500023bd0818
7143511: G1: Another instance of high GC Worker Other time (50ms)
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5963
diff
changeset
|
4705 G1ParScanPermClosure only_scan_perm_cl(_g1h, &pss, rp); |
|
500023bd0818
7143511: G1: Another instance of high GC Worker Other time (50ms)
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diff
changeset
|
4706 |
|
500023bd0818
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5963
diff
changeset
|
4707 G1ParScanAndMarkExtRootClosure scan_mark_root_cl(_g1h, &pss, rp); |
|
500023bd0818
7143511: G1: Another instance of high GC Worker Other time (50ms)
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5963
diff
changeset
|
4708 G1ParScanAndMarkPermClosure scan_mark_perm_cl(_g1h, &pss, rp); |
|
500023bd0818
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5963
diff
changeset
|
4709 |
|
500023bd0818
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5963
diff
changeset
|
4710 OopClosure* scan_root_cl = &only_scan_root_cl; |
|
500023bd0818
7143511: G1: Another instance of high GC Worker Other time (50ms)
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5963
diff
changeset
|
4711 OopsInHeapRegionClosure* scan_perm_cl = &only_scan_perm_cl; |
|
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|
4712 |
|
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|
4713 if (_g1h->g1_policy()->during_initial_mark_pause()) { |
|
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|
4714 // We also need to mark copied objects. |
|
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|
4715 scan_root_cl = &scan_mark_root_cl; |
|
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|
4716 scan_perm_cl = &scan_mark_perm_cl; |
|
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|
4717 } |
|
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|
4718 |
|
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|
4719 G1ParPushHeapRSClosure push_heap_rs_cl(_g1h, &pss); |
|
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|
4720 |
|
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|
4721 pss.start_strong_roots(); |
|
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|
4722 _g1h->g1_process_strong_roots(/* not collecting perm */ false, |
|
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|
4723 SharedHeap::SO_AllClasses, |
|
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|
4724 scan_root_cl, |
|
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|
4725 &push_heap_rs_cl, |
|
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|
4726 scan_perm_cl, |
|
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|
4727 worker_id); |
|
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|
4728 pss.end_strong_roots(); |
|
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|
4729 |
|
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|
4730 { |
|
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|
4731 double start = os::elapsedTime(); |
|
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|
4732 G1ParEvacuateFollowersClosure evac(_g1h, &pss, _queues, &_terminator); |
|
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|
4733 evac.do_void(); |
|
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|
4734 double elapsed_ms = (os::elapsedTime()-start)*1000.0; |
|
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|
4735 double term_ms = pss.term_time()*1000.0; |
|
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|
4736 _g1h->g1_policy()->record_obj_copy_time(worker_id, elapsed_ms-term_ms); |
|
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|
4737 _g1h->g1_policy()->record_termination(worker_id, term_ms, pss.term_attempts()); |
|
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|
4738 } |
|
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|
4739 _g1h->g1_policy()->record_thread_age_table(pss.age_table()); |
|
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|
4740 _g1h->update_surviving_young_words(pss.surviving_young_words()+1); |
|
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|
4741 |
|
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|
4742 // Clean up any par-expanded rem sets. |
|
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|
4743 HeapRegionRemSet::par_cleanup(); |
|
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|
4744 |
|
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|
4745 if (ParallelGCVerbose) { |
|
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|
4746 MutexLocker x(stats_lock()); |
|
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|
4747 pss.print_termination_stats(worker_id); |
|
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|
4748 } |
|
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changeset
|
4749 |
|
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|
4750 assert(pss.refs()->is_empty(), "should be empty"); |
|
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|
4751 |
|
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|
4752 // Close the inner scope so that the ResourceMark and HandleMark |
|
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|
4753 // destructors are executed here and are included as part of the |
|
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|
4754 // "GC Worker Time". |
| 342 | 4755 } |
| 4756 | |
| 1611 | 4757 double end_time_ms = os::elapsedTime() * 1000.0; |
|
4728
441e946dc1af
7121618: Change type of number of GC workers to unsigned int.
jmasa
parents:
4711
diff
changeset
|
4758 _g1h->g1_policy()->record_gc_worker_end_time(worker_id, end_time_ms); |
| 342 | 4759 } |
| 4760 }; | |
| 4761 | |
| 4762 // *** Common G1 Evacuation Stuff | |
| 4763 | |
|
5986
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|
4764 // Closures that support the filtering of CodeBlobs scanned during |
|
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5963
diff
changeset
|
4765 // external root scanning. |
|
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diff
changeset
|
4766 |
|
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changeset
|
4767 // Closure applied to reference fields in code blobs (specifically nmethods) |
|
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|
4768 // to determine whether an nmethod contains references that point into |
|
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|
4769 // the collection set. Used as a predicate when walking code roots so |
|
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|
4770 // that only nmethods that point into the collection set are added to the |
|
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|
4771 // 'marked' list. |
|
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|
4772 |
|
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diff
changeset
|
4773 class G1FilteredCodeBlobToOopClosure : public CodeBlobToOopClosure { |
|
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|
4774 |
|
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|
4775 class G1PointsIntoCSOopClosure : public OopClosure { |
|
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|
4776 G1CollectedHeap* _g1; |
|
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|
4777 bool _points_into_cs; |
|
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|
4778 public: |
|
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diff
changeset
|
4779 G1PointsIntoCSOopClosure(G1CollectedHeap* g1) : |
|
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|
4780 _g1(g1), _points_into_cs(false) { } |
|
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|
4781 |
|
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diff
changeset
|
4782 bool points_into_cs() const { return _points_into_cs; } |
|
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|
4783 |
|
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diff
changeset
|
4784 template <class T> |
|
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diff
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|
4785 void do_oop_nv(T* p) { |
|
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changeset
|
4786 if (!_points_into_cs) { |
|
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diff
changeset
|
4787 T heap_oop = oopDesc::load_heap_oop(p); |
|
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5963
diff
changeset
|
4788 if (!oopDesc::is_null(heap_oop) && |
|
500023bd0818
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5963
diff
changeset
|
4789 _g1->in_cset_fast_test(oopDesc::decode_heap_oop_not_null(heap_oop))) { |
|
500023bd0818
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diff
changeset
|
4790 _points_into_cs = true; |
|
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5963
diff
changeset
|
4791 } |
|
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diff
changeset
|
4792 } |
|
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5963
diff
changeset
|
4793 } |
|
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5963
diff
changeset
|
4794 |
|
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diff
changeset
|
4795 virtual void do_oop(oop* p) { do_oop_nv(p); } |
|
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parents:
5963
diff
changeset
|
4796 virtual void do_oop(narrowOop* p) { do_oop_nv(p); } |
|
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diff
changeset
|
4797 }; |
|
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diff
changeset
|
4798 |
|
500023bd0818
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parents:
5963
diff
changeset
|
4799 G1CollectedHeap* _g1; |
|
500023bd0818
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parents:
5963
diff
changeset
|
4800 |
|
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5963
diff
changeset
|
4801 public: |
|
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parents:
5963
diff
changeset
|
4802 G1FilteredCodeBlobToOopClosure(G1CollectedHeap* g1, OopClosure* cl) : |
|
500023bd0818
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5963
diff
changeset
|
4803 CodeBlobToOopClosure(cl, true), _g1(g1) { } |
|
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diff
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|
4804 |
|
500023bd0818
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diff
changeset
|
4805 virtual void do_code_blob(CodeBlob* cb) { |
|
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5963
diff
changeset
|
4806 nmethod* nm = cb->as_nmethod_or_null(); |
|
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5963
diff
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|
4807 if (nm != NULL && !(nm->test_oops_do_mark())) { |
|
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diff
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|
4808 G1PointsIntoCSOopClosure predicate_cl(_g1); |
|
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diff
changeset
|
4809 nm->oops_do(&predicate_cl); |
|
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diff
changeset
|
4810 |
|
500023bd0818
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5963
diff
changeset
|
4811 if (predicate_cl.points_into_cs()) { |
|
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5963
diff
changeset
|
4812 // At least one of the reference fields or the oop relocations |
|
500023bd0818
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diff
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|
4813 // in the nmethod points into the collection set. We have to |
|
500023bd0818
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diff
changeset
|
4814 // 'mark' this nmethod. |
|
500023bd0818
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5963
diff
changeset
|
4815 // Note: Revisit the following if CodeBlobToOopClosure::do_code_blob() |
|
500023bd0818
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5963
diff
changeset
|
4816 // or MarkingCodeBlobClosure::do_code_blob() change. |
|
500023bd0818
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diff
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|
4817 if (!nm->test_set_oops_do_mark()) { |
|
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5963
diff
changeset
|
4818 do_newly_marked_nmethod(nm); |
|
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diff
changeset
|
4819 } |
|
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diff
changeset
|
4820 } |
|
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diff
changeset
|
4821 } |
|
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changeset
|
4822 } |
|
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|
4823 }; |
|
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diff
changeset
|
4824 |
|
1833
8b10f48633dc
6984287: Regularize how GC parallel workers are specified.
jmasa
parents:
1755
diff
changeset
|
4825 // This method is run in a GC worker. |
|
8b10f48633dc
6984287: Regularize how GC parallel workers are specified.
jmasa
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1755
diff
changeset
|
4826 |
| 342 | 4827 void |
| 4828 G1CollectedHeap:: | |
| 4829 g1_process_strong_roots(bool collecting_perm_gen, | |
|
4910
caa4652b4414
7129892: G1: explicit marking cycle initiation might fail to initiate a marking cycle
tonyp
parents:
4875
diff
changeset
|
4830 ScanningOption so, |
| 342 | 4831 OopClosure* scan_non_heap_roots, |
| 4832 OopsInHeapRegionClosure* scan_rs, | |
| 4833 OopsInGenClosure* scan_perm, | |
| 4834 int worker_i) { | |
|
3979
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
4835 |
| 342 | 4836 // First scan the strong roots, including the perm gen. |
| 4837 double ext_roots_start = os::elapsedTime(); | |
| 4838 double closure_app_time_sec = 0.0; | |
| 4839 | |
| 4840 BufferingOopClosure buf_scan_non_heap_roots(scan_non_heap_roots); | |
| 4841 BufferingOopsInGenClosure buf_scan_perm(scan_perm); | |
| 4842 buf_scan_perm.set_generation(perm_gen()); | |
| 4843 | |
|
989
148e5441d916
6863023: need non-perm oops in code cache for JSR 292
jrose
parents:
890
diff
changeset
|
4844 // Walk the code cache w/o buffering, because StarTask cannot handle |
|
148e5441d916
6863023: need non-perm oops in code cache for JSR 292
jrose
parents:
890
diff
changeset
|
4845 // unaligned oop locations. |
|
5986
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5963
diff
changeset
|
4846 G1FilteredCodeBlobToOopClosure eager_scan_code_roots(this, scan_non_heap_roots); |
|
989
148e5441d916
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|
4847 |
|
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|
4848 process_strong_roots(false, // no scoping; this is parallel code |
|
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diff
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|
4849 collecting_perm_gen, so, |
| 342 | 4850 &buf_scan_non_heap_roots, |
|
989
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|
4851 &eager_scan_code_roots, |
| 342 | 4852 &buf_scan_perm); |
|
1394
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
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1391
diff
changeset
|
4853 |
|
3979
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|
4854 // Now the CM ref_processor roots. |
|
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|
4855 if (!_process_strong_tasks->is_task_claimed(G1H_PS_refProcessor_oops_do)) { |
|
3979
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|
4856 // We need to treat the discovered reference lists of the |
|
4dfb2df418f2
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|
4857 // concurrent mark ref processor as roots and keep entries |
|
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|
4858 // (which are added by the marking threads) on them live |
|
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|
4859 // until they can be processed at the end of marking. |
|
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|
4860 ref_processor_cm()->weak_oops_do(&buf_scan_non_heap_roots); |
|
3823
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|
4861 } |
|
14a2fd14c0db
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|
4862 |
|
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|
4863 // Finish up any enqueued closure apps (attributed as object copy time). |
| 342 | 4864 buf_scan_non_heap_roots.done(); |
| 4865 buf_scan_perm.done(); | |
|
3823
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|
4866 |
| 342 | 4867 double ext_roots_end = os::elapsedTime(); |
|
3823
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|
4868 |
| 342 | 4869 g1_policy()->reset_obj_copy_time(worker_i); |
|
3823
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|
4870 double obj_copy_time_sec = buf_scan_perm.closure_app_seconds() + |
|
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|
4871 buf_scan_non_heap_roots.closure_app_seconds(); |
| 342 | 4872 g1_policy()->record_obj_copy_time(worker_i, obj_copy_time_sec * 1000.0); |
|
3823
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|
4873 |
| 342 | 4874 double ext_root_time_ms = |
| 4875 ((ext_roots_end - ext_roots_start) - obj_copy_time_sec) * 1000.0; | |
|
3823
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|
4876 |
| 342 | 4877 g1_policy()->record_ext_root_scan_time(worker_i, ext_root_time_ms); |
| 4878 | |
|
4787
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
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4785
diff
changeset
|
4879 // During conc marking we have to filter the per-thread SATB buffers |
|
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
4785
diff
changeset
|
4880 // to make sure we remove any oops into the CSet (which will show up |
|
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
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4785
diff
changeset
|
4881 // as implicitly live). |
|
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
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4785
diff
changeset
|
4882 if (!_process_strong_tasks->is_task_claimed(G1H_PS_filter_satb_buffers)) { |
|
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
4785
diff
changeset
|
4883 if (mark_in_progress()) { |
|
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
4785
diff
changeset
|
4884 JavaThread::satb_mark_queue_set().filter_thread_buffers(); |
|
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
4785
diff
changeset
|
4885 } |
|
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
4785
diff
changeset
|
4886 } |
|
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
4785
diff
changeset
|
4887 double satb_filtering_ms = (os::elapsedTime() - ext_roots_end) * 1000.0; |
|
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
4785
diff
changeset
|
4888 g1_policy()->record_satb_filtering_time(worker_i, satb_filtering_ms); |
| 342 | 4889 |
| 4890 // Now scan the complement of the collection set. | |
| 4891 if (scan_rs != NULL) { | |
| 4892 g1_rem_set()->oops_into_collection_set_do(scan_rs, worker_i); | |
| 4893 } | |
|
3823
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|
4894 |
| 342 | 4895 _process_strong_tasks->all_tasks_completed(); |
| 4896 } | |
| 4897 | |
| 4898 void | |
| 4899 G1CollectedHeap::g1_process_weak_roots(OopClosure* root_closure, | |
| 4900 OopClosure* non_root_closure) { | |
|
989
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890
diff
changeset
|
4901 CodeBlobToOopClosure roots_in_blobs(root_closure, /*do_marking=*/ false); |
|
148e5441d916
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diff
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|
4902 SharedHeap::process_weak_roots(root_closure, &roots_in_blobs, non_root_closure); |
| 342 | 4903 } |
| 4904 | |
|
3979
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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diff
changeset
|
4905 // Weak Reference Processing support |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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diff
changeset
|
4906 |
|
4dfb2df418f2
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diff
changeset
|
4907 // An always "is_alive" closure that is used to preserve referents. |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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parents:
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diff
changeset
|
4908 // If the object is non-null then it's alive. Used in the preservation |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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diff
changeset
|
4909 // of referent objects that are pointed to by reference objects |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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parents:
3973
diff
changeset
|
4910 // discovered by the CM ref processor. |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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parents:
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diff
changeset
|
4911 class G1AlwaysAliveClosure: public BoolObjectClosure { |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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parents:
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diff
changeset
|
4912 G1CollectedHeap* _g1; |
|
4dfb2df418f2
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johnc
parents:
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diff
changeset
|
4913 public: |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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parents:
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diff
changeset
|
4914 G1AlwaysAliveClosure(G1CollectedHeap* g1) : _g1(g1) {} |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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parents:
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diff
changeset
|
4915 void do_object(oop p) { assert(false, "Do not call."); } |
|
4dfb2df418f2
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parents:
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diff
changeset
|
4916 bool do_object_b(oop p) { |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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parents:
3973
diff
changeset
|
4917 if (p != NULL) { |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
4918 return true; |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
4919 } |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
4920 return false; |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
4921 } |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
4922 }; |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
4923 |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
4924 bool G1STWIsAliveClosure::do_object_b(oop p) { |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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parents:
3973
diff
changeset
|
4925 // An object is reachable if it is outside the collection set, |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
4926 // or is inside and copied. |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
4927 return !_g1->obj_in_cs(p) || p->is_forwarded(); |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
4928 } |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
4929 |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
4930 // Non Copying Keep Alive closure |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
4931 class G1KeepAliveClosure: public OopClosure { |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
4932 G1CollectedHeap* _g1; |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
4933 public: |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
4934 G1KeepAliveClosure(G1CollectedHeap* g1) : _g1(g1) {} |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
4935 void do_oop(narrowOop* p) { guarantee(false, "Not needed"); } |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
4936 void do_oop( oop* p) { |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
4937 oop obj = *p; |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
4938 |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
4939 if (_g1->obj_in_cs(obj)) { |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
4940 assert( obj->is_forwarded(), "invariant" ); |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
4941 *p = obj->forwardee(); |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
4942 } |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
4943 } |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
4944 }; |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
4945 |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
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diff
changeset
|
4946 // Copying Keep Alive closure - can be called from both |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
4947 // serial and parallel code as long as different worker |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
4948 // threads utilize different G1ParScanThreadState instances |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
4949 // and different queues. |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
4950 |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
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diff
changeset
|
4951 class G1CopyingKeepAliveClosure: public OopClosure { |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
4952 G1CollectedHeap* _g1h; |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
4953 OopClosure* _copy_non_heap_obj_cl; |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
4954 OopsInHeapRegionClosure* _copy_perm_obj_cl; |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
4955 G1ParScanThreadState* _par_scan_state; |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
4956 |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
4957 public: |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
4958 G1CopyingKeepAliveClosure(G1CollectedHeap* g1h, |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
4959 OopClosure* non_heap_obj_cl, |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
4960 OopsInHeapRegionClosure* perm_obj_cl, |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
4961 G1ParScanThreadState* pss): |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
4962 _g1h(g1h), |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
4963 _copy_non_heap_obj_cl(non_heap_obj_cl), |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
4964 _copy_perm_obj_cl(perm_obj_cl), |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
4965 _par_scan_state(pss) |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
4966 {} |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
4967 |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
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diff
changeset
|
4968 virtual void do_oop(narrowOop* p) { do_oop_work(p); } |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
4969 virtual void do_oop( oop* p) { do_oop_work(p); } |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
4970 |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
4971 template <class T> void do_oop_work(T* p) { |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
4972 oop obj = oopDesc::load_decode_heap_oop(p); |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
4973 |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
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diff
changeset
|
4974 if (_g1h->obj_in_cs(obj)) { |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
4975 // If the referent object has been forwarded (either copied |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
4976 // to a new location or to itself in the event of an |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
4977 // evacuation failure) then we need to update the reference |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
4978 // field and, if both reference and referent are in the G1 |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
4979 // heap, update the RSet for the referent. |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
4980 // |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
4981 // If the referent has not been forwarded then we have to keep |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
4982 // it alive by policy. Therefore we have copy the referent. |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
4983 // |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
4984 // If the reference field is in the G1 heap then we can push |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
4985 // on the PSS queue. When the queue is drained (after each |
|
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|
4986 // phase of reference processing) the object and it's followers |
|
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|
4987 // will be copied, the reference field set to point to the |
|
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|
4988 // new location, and the RSet updated. Otherwise we need to |
|
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|
4989 // use the the non-heap or perm closures directly to copy |
|
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|
4990 // the refernt object and update the pointer, while avoiding |
|
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|
4991 // updating the RSet. |
|
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parents:
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diff
changeset
|
4992 |
|
4dfb2df418f2
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diff
changeset
|
4993 if (_g1h->is_in_g1_reserved(p)) { |
|
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changeset
|
4994 _par_scan_state->push_on_queue(p); |
|
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6484982: G1: process references during evacuation pauses
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parents:
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|
4995 } else { |
|
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parents:
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diff
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|
4996 // The reference field is not in the G1 heap. |
|
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diff
changeset
|
4997 if (_g1h->perm_gen()->is_in(p)) { |
|
4dfb2df418f2
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parents:
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diff
changeset
|
4998 _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
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|
4999 } else { |
|
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diff
changeset
|
5000 _copy_non_heap_obj_cl->do_oop(p); |
|
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|
5001 } |
|
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parents:
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diff
changeset
|
5002 } |
|
4dfb2df418f2
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parents:
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diff
changeset
|
5003 } |
|
4dfb2df418f2
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parents:
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diff
changeset
|
5004 } |
|
4dfb2df418f2
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parents:
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diff
changeset
|
5005 }; |
|
4dfb2df418f2
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parents:
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diff
changeset
|
5006 |
|
4dfb2df418f2
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diff
changeset
|
5007 // Serial drain queue closure. Called as the 'complete_gc' |
|
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changeset
|
5008 // closure for each discovered list in some of the |
|
4dfb2df418f2
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changeset
|
5009 // reference processing phases. |
|
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parents:
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diff
changeset
|
5010 |
|
4dfb2df418f2
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parents:
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diff
changeset
|
5011 class G1STWDrainQueueClosure: public VoidClosure { |
|
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6484982: G1: process references during evacuation pauses
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parents:
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|
5012 protected: |
|
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parents:
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diff
changeset
|
5013 G1CollectedHeap* _g1h; |
|
4dfb2df418f2
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changeset
|
5014 G1ParScanThreadState* _par_scan_state; |
|
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parents:
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changeset
|
5015 |
|
4dfb2df418f2
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diff
changeset
|
5016 G1ParScanThreadState* par_scan_state() { return _par_scan_state; } |
|
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parents:
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changeset
|
5017 |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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parents:
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diff
changeset
|
5018 public: |
|
4dfb2df418f2
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parents:
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diff
changeset
|
5019 G1STWDrainQueueClosure(G1CollectedHeap* g1h, G1ParScanThreadState* pss) : |
|
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parents:
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changeset
|
5020 _g1h(g1h), |
|
4dfb2df418f2
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parents:
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diff
changeset
|
5021 _par_scan_state(pss) |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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parents:
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changeset
|
5022 { } |
|
4dfb2df418f2
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parents:
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diff
changeset
|
5023 |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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parents:
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diff
changeset
|
5024 void do_void() { |
|
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parents:
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diff
changeset
|
5025 G1ParScanThreadState* const pss = par_scan_state(); |
|
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parents:
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diff
changeset
|
5026 pss->trim_queue(); |
|
4dfb2df418f2
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parents:
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diff
changeset
|
5027 } |
|
4dfb2df418f2
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parents:
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diff
changeset
|
5028 }; |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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parents:
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diff
changeset
|
5029 |
|
4dfb2df418f2
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parents:
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diff
changeset
|
5030 // Parallel Reference Processing closures |
|
4dfb2df418f2
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parents:
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diff
changeset
|
5031 |
|
4dfb2df418f2
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parents:
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diff
changeset
|
5032 // Implementation of AbstractRefProcTaskExecutor for parallel reference |
|
4dfb2df418f2
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parents:
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diff
changeset
|
5033 // processing during G1 evacuation pauses. |
|
4dfb2df418f2
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parents:
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diff
changeset
|
5034 |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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parents:
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diff
changeset
|
5035 class G1STWRefProcTaskExecutor: public AbstractRefProcTaskExecutor { |
|
4dfb2df418f2
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parents:
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diff
changeset
|
5036 private: |
|
4dfb2df418f2
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parents:
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diff
changeset
|
5037 G1CollectedHeap* _g1h; |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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parents:
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diff
changeset
|
5038 RefToScanQueueSet* _queues; |
|
4095
bca17e38de00
6593758: RFE: Enhance GC ergonomics to dynamically choose ParallelGCThreads
jmasa
parents:
4090
diff
changeset
|
5039 FlexibleWorkGang* _workers; |
|
3979
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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parents:
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diff
changeset
|
5040 int _active_workers; |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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parents:
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diff
changeset
|
5041 |
|
4dfb2df418f2
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parents:
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diff
changeset
|
5042 public: |
|
4dfb2df418f2
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johnc
parents:
3973
diff
changeset
|
5043 G1STWRefProcTaskExecutor(G1CollectedHeap* g1h, |
|
4095
bca17e38de00
6593758: RFE: Enhance GC ergonomics to dynamically choose ParallelGCThreads
jmasa
parents:
4090
diff
changeset
|
5044 FlexibleWorkGang* workers, |
|
3979
4dfb2df418f2
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parents:
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diff
changeset
|
5045 RefToScanQueueSet *task_queues, |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
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diff
changeset
|
5046 int n_workers) : |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5047 _g1h(g1h), |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5048 _queues(task_queues), |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5049 _workers(workers), |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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parents:
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diff
changeset
|
5050 _active_workers(n_workers) |
|
4dfb2df418f2
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parents:
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diff
changeset
|
5051 { |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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parents:
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diff
changeset
|
5052 assert(n_workers > 0, "shouldn't call this otherwise"); |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5053 } |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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parents:
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diff
changeset
|
5054 |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
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diff
changeset
|
5055 // Executes the given task using concurrent marking worker threads. |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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parents:
3973
diff
changeset
|
5056 virtual void execute(ProcessTask& task); |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5057 virtual void execute(EnqueueTask& task); |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5058 }; |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5059 |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5060 // Gang task for possibly parallel reference processing |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5061 |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5062 class G1STWRefProcTaskProxy: public AbstractGangTask { |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5063 typedef AbstractRefProcTaskExecutor::ProcessTask ProcessTask; |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5064 ProcessTask& _proc_task; |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5065 G1CollectedHeap* _g1h; |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
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diff
changeset
|
5066 RefToScanQueueSet *_task_queues; |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5067 ParallelTaskTerminator* _terminator; |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5068 |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5069 public: |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5070 G1STWRefProcTaskProxy(ProcessTask& proc_task, |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5071 G1CollectedHeap* g1h, |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5072 RefToScanQueueSet *task_queues, |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5073 ParallelTaskTerminator* terminator) : |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5074 AbstractGangTask("Process reference objects in parallel"), |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5075 _proc_task(proc_task), |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5076 _g1h(g1h), |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5077 _task_queues(task_queues), |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5078 _terminator(terminator) |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5079 {} |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5080 |
|
4728
441e946dc1af
7121618: Change type of number of GC workers to unsigned int.
jmasa
parents:
4711
diff
changeset
|
5081 virtual void work(uint worker_id) { |
|
3979
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5082 // The reference processing task executed by a single worker. |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5083 ResourceMark rm; |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5084 HandleMark hm; |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5085 |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5086 G1STWIsAliveClosure is_alive(_g1h); |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5087 |
|
4728
441e946dc1af
7121618: Change type of number of GC workers to unsigned int.
jmasa
parents:
4711
diff
changeset
|
5088 G1ParScanThreadState pss(_g1h, worker_id); |
|
3979
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5089 |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5090 G1ParScanHeapEvacClosure scan_evac_cl(_g1h, &pss, NULL); |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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parents:
3973
diff
changeset
|
5091 G1ParScanHeapEvacFailureClosure evac_failure_cl(_g1h, &pss, NULL); |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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parents:
3973
diff
changeset
|
5092 G1ParScanPartialArrayClosure partial_scan_cl(_g1h, &pss, NULL); |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5093 |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5094 pss.set_evac_closure(&scan_evac_cl); |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5095 pss.set_evac_failure_closure(&evac_failure_cl); |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5096 pss.set_partial_scan_closure(&partial_scan_cl); |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5097 |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5098 G1ParScanExtRootClosure only_copy_non_heap_cl(_g1h, &pss, NULL); |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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parents:
3973
diff
changeset
|
5099 G1ParScanPermClosure only_copy_perm_cl(_g1h, &pss, NULL); |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5100 |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5101 G1ParScanAndMarkExtRootClosure copy_mark_non_heap_cl(_g1h, &pss, NULL); |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5102 G1ParScanAndMarkPermClosure copy_mark_perm_cl(_g1h, &pss, NULL); |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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parents:
3973
diff
changeset
|
5103 |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5104 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
|
5105 OopsInHeapRegionClosure* copy_perm_cl = &only_copy_perm_cl; |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5106 |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5107 if (_g1h->g1_policy()->during_initial_mark_pause()) { |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5108 // We also need to mark copied objects. |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5109 copy_non_heap_cl = ©_mark_non_heap_cl; |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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parents:
3973
diff
changeset
|
5110 copy_perm_cl = ©_mark_perm_cl; |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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parents:
3973
diff
changeset
|
5111 } |
|
4dfb2df418f2
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|
5112 |
|
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|
5113 // Keep alive closure. |
|
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|
5114 G1CopyingKeepAliveClosure keep_alive(_g1h, copy_non_heap_cl, copy_perm_cl, &pss); |
|
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|
5115 |
|
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|
5116 // Complete GC closure |
|
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|
5117 G1ParEvacuateFollowersClosure drain_queue(_g1h, &pss, _task_queues, _terminator); |
|
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|
5118 |
|
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|
5119 // Call the reference processing task's work routine. |
|
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5120 _proc_task.work(worker_id, is_alive, keep_alive, drain_queue); |
|
3979
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|
5121 |
|
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|
5122 // Note we cannot assert that the refs array is empty here as not all |
|
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5123 // of the processing tasks (specifically phase2 - pp2_work) execute |
|
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5124 // the complete_gc closure (which ordinarily would drain the queue) so |
|
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|
5125 // the queue may not be empty. |
|
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|
5126 } |
|
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|
5127 }; |
|
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|
5128 |
|
4dfb2df418f2
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|
5129 // Driver routine for parallel reference processing. |
|
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|
5130 // Creates an instance of the ref processing gang |
|
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|
5131 // task and has the worker threads execute it. |
|
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|
5132 void G1STWRefProcTaskExecutor::execute(ProcessTask& proc_task) { |
|
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|
5133 assert(_workers != NULL, "Need parallel worker threads."); |
|
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|
5134 |
|
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|
5135 ParallelTaskTerminator terminator(_active_workers, _queues); |
|
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|
5136 G1STWRefProcTaskProxy proc_task_proxy(proc_task, _g1h, _queues, &terminator); |
|
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|
5137 |
|
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|
5138 _g1h->set_par_threads(_active_workers); |
|
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|
5139 _workers->run_task(&proc_task_proxy); |
|
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|
5140 _g1h->set_par_threads(0); |
|
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|
5141 } |
|
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|
5142 |
|
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|
5143 // Gang task for parallel reference enqueueing. |
|
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|
5144 |
|
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|
5145 class G1STWRefEnqueueTaskProxy: public AbstractGangTask { |
|
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|
5146 typedef AbstractRefProcTaskExecutor::EnqueueTask EnqueueTask; |
|
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|
5147 EnqueueTask& _enq_task; |
|
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|
5148 |
|
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|
5149 public: |
|
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|
5150 G1STWRefEnqueueTaskProxy(EnqueueTask& enq_task) : |
|
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|
5151 AbstractGangTask("Enqueue reference objects in parallel"), |
|
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|
5152 _enq_task(enq_task) |
|
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|
5153 { } |
|
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|
5154 |
|
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|
5155 virtual void work(uint worker_id) { |
|
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|
5156 _enq_task.work(worker_id); |
|
3979
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|
5157 } |
|
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|
5158 }; |
|
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|
5159 |
|
4dfb2df418f2
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|
5160 // Driver routine for parallel reference enqueing. |
|
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|
5161 // Creates an instance of the ref enqueueing gang |
|
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|
5162 // task and has the worker threads execute it. |
|
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|
5163 |
|
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|
5164 void G1STWRefProcTaskExecutor::execute(EnqueueTask& enq_task) { |
|
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|
5165 assert(_workers != NULL, "Need parallel worker threads."); |
|
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|
5166 |
|
4dfb2df418f2
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|
5167 G1STWRefEnqueueTaskProxy enq_task_proxy(enq_task); |
|
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|
5168 |
|
4dfb2df418f2
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|
5169 _g1h->set_par_threads(_active_workers); |
|
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|
5170 _workers->run_task(&enq_task_proxy); |
|
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|
5171 _g1h->set_par_threads(0); |
|
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|
5172 } |
|
4dfb2df418f2
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parents:
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diff
changeset
|
5173 |
|
4dfb2df418f2
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diff
changeset
|
5174 // End of weak reference support closures |
|
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parents:
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diff
changeset
|
5175 |
|
4dfb2df418f2
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diff
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|
5176 // Abstract task used to preserve (i.e. copy) any referent objects |
|
4dfb2df418f2
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|
5177 // that are in the collection set and are pointed to by reference |
|
4dfb2df418f2
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|
5178 // objects discovered by the CM ref processor. |
|
4dfb2df418f2
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parents:
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diff
changeset
|
5179 |
|
4dfb2df418f2
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|
5180 class G1ParPreserveCMReferentsTask: public AbstractGangTask { |
|
4dfb2df418f2
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|
5181 protected: |
|
4dfb2df418f2
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parents:
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diff
changeset
|
5182 G1CollectedHeap* _g1h; |
|
4dfb2df418f2
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diff
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|
5183 RefToScanQueueSet *_queues; |
|
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changeset
|
5184 ParallelTaskTerminator _terminator; |
|
4728
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|
5185 uint _n_workers; |
|
3979
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|
5186 |
|
4dfb2df418f2
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diff
changeset
|
5187 public: |
|
4dfb2df418f2
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parents:
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diff
changeset
|
5188 G1ParPreserveCMReferentsTask(G1CollectedHeap* g1h,int workers, RefToScanQueueSet *task_queues) : |
|
4dfb2df418f2
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diff
changeset
|
5189 AbstractGangTask("ParPreserveCMReferents"), |
|
4dfb2df418f2
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parents:
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diff
changeset
|
5190 _g1h(g1h), |
|
4dfb2df418f2
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parents:
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diff
changeset
|
5191 _queues(task_queues), |
|
4dfb2df418f2
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diff
changeset
|
5192 _terminator(workers, _queues), |
|
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diff
changeset
|
5193 _n_workers(workers) |
|
4dfb2df418f2
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parents:
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diff
changeset
|
5194 { } |
|
4dfb2df418f2
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diff
changeset
|
5195 |
|
4728
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changeset
|
5196 void work(uint worker_id) { |
|
3979
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|
5197 ResourceMark rm; |
|
4dfb2df418f2
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parents:
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diff
changeset
|
5198 HandleMark hm; |
|
4dfb2df418f2
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diff
changeset
|
5199 |
|
4728
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changeset
|
5200 G1ParScanThreadState pss(_g1h, worker_id); |
|
3979
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|
5201 G1ParScanHeapEvacClosure scan_evac_cl(_g1h, &pss, NULL); |
|
4dfb2df418f2
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|
5202 G1ParScanHeapEvacFailureClosure evac_failure_cl(_g1h, &pss, NULL); |
|
4dfb2df418f2
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|
5203 G1ParScanPartialArrayClosure partial_scan_cl(_g1h, &pss, NULL); |
|
4dfb2df418f2
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changeset
|
5204 |
|
4dfb2df418f2
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diff
changeset
|
5205 pss.set_evac_closure(&scan_evac_cl); |
|
4dfb2df418f2
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|
5206 pss.set_evac_failure_closure(&evac_failure_cl); |
|
4dfb2df418f2
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|
5207 pss.set_partial_scan_closure(&partial_scan_cl); |
|
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|
5208 |
|
4dfb2df418f2
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diff
changeset
|
5209 assert(pss.refs()->is_empty(), "both queue and overflow should be empty"); |
|
4dfb2df418f2
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changeset
|
5210 |
|
4dfb2df418f2
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diff
changeset
|
5211 |
|
4dfb2df418f2
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diff
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|
5212 G1ParScanExtRootClosure only_copy_non_heap_cl(_g1h, &pss, NULL); |
|
4dfb2df418f2
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|
5213 G1ParScanPermClosure only_copy_perm_cl(_g1h, &pss, NULL); |
|
4dfb2df418f2
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|
5214 |
|
4dfb2df418f2
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diff
changeset
|
5215 G1ParScanAndMarkExtRootClosure copy_mark_non_heap_cl(_g1h, &pss, NULL); |
|
4dfb2df418f2
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|
5216 G1ParScanAndMarkPermClosure copy_mark_perm_cl(_g1h, &pss, NULL); |
|
4dfb2df418f2
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|
5217 |
|
4dfb2df418f2
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|
5218 OopClosure* copy_non_heap_cl = &only_copy_non_heap_cl; |
|
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|
5219 OopsInHeapRegionClosure* copy_perm_cl = &only_copy_perm_cl; |
|
4dfb2df418f2
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|
5220 |
|
4dfb2df418f2
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diff
changeset
|
5221 if (_g1h->g1_policy()->during_initial_mark_pause()) { |
|
4dfb2df418f2
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diff
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|
5222 // We also need to mark copied objects. |
|
4dfb2df418f2
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diff
changeset
|
5223 copy_non_heap_cl = ©_mark_non_heap_cl; |
|
4dfb2df418f2
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|
5224 copy_perm_cl = ©_mark_perm_cl; |
|
4dfb2df418f2
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|
5225 } |
|
4dfb2df418f2
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diff
changeset
|
5226 |
|
4dfb2df418f2
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diff
changeset
|
5227 // Is alive closure |
|
4dfb2df418f2
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diff
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|
5228 G1AlwaysAliveClosure always_alive(_g1h); |
|
4dfb2df418f2
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changeset
|
5229 |
|
4dfb2df418f2
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diff
changeset
|
5230 // Copying keep alive closure. Applied to referent objects that need |
|
4dfb2df418f2
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diff
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|
5231 // to be copied. |
|
4dfb2df418f2
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diff
changeset
|
5232 G1CopyingKeepAliveClosure keep_alive(_g1h, copy_non_heap_cl, copy_perm_cl, &pss); |
|
4dfb2df418f2
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changeset
|
5233 |
|
4dfb2df418f2
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changeset
|
5234 ReferenceProcessor* rp = _g1h->ref_processor_cm(); |
|
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|
5235 |
|
4728
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changeset
|
5236 uint limit = ReferenceProcessor::number_of_subclasses_of_ref() * rp->max_num_q(); |
|
441e946dc1af
7121618: Change type of number of GC workers to unsigned int.
jmasa
parents:
4711
diff
changeset
|
5237 uint stride = MIN2(MAX2(_n_workers, 1U), limit); |
|
3979
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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parents:
3973
diff
changeset
|
5238 |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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parents:
3973
diff
changeset
|
5239 // limit is set using max_num_q() - which was set using ParallelGCThreads. |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5240 // So this must be true - but assert just in case someone decides to |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5241 // change the worker ids. |
|
4728
441e946dc1af
7121618: Change type of number of GC workers to unsigned int.
jmasa
parents:
4711
diff
changeset
|
5242 assert(0 <= worker_id && worker_id < limit, "sanity"); |
|
3979
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5243 assert(!rp->discovery_is_atomic(), "check this code"); |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5244 |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5245 // Select discovered lists [i, i+stride, i+2*stride,...,limit) |
|
4728
441e946dc1af
7121618: Change type of number of GC workers to unsigned int.
jmasa
parents:
4711
diff
changeset
|
5246 for (uint idx = worker_id; idx < limit; idx += stride) { |
|
4014
bf2d2b8b1726
7095243: Disambiguate ReferenceProcessor::_discoveredSoftRefs
johnc
parents:
4013
diff
changeset
|
5247 DiscoveredList& ref_list = rp->discovered_refs()[idx]; |
|
3979
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 DiscoveredListIterator iter(ref_list, &keep_alive, &always_alive); |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5250 while (iter.has_next()) { |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5251 // Since discovery is not atomic for the CM ref processor, we |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5252 // can see some null referent objects. |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5253 iter.load_ptrs(DEBUG_ONLY(true)); |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5254 oop ref = iter.obj(); |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5255 |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5256 // This will filter nulls. |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5257 if (iter.is_referent_alive()) { |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5258 iter.make_referent_alive(); |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5259 } |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5260 iter.move_to_next(); |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5261 } |
|
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 // Drain the queue - which may cause stealing |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5265 G1ParEvacuateFollowersClosure drain_queue(_g1h, &pss, _queues, &_terminator); |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5266 drain_queue.do_void(); |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5267 // Allocation buffers were retired at the end of G1ParEvacuateFollowersClosure |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5268 assert(pss.refs()->is_empty(), "should be"); |
|
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 }; |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5271 |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5272 // Weak Reference processing during an evacuation pause (part 1). |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5273 void G1CollectedHeap::process_discovered_references() { |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5274 double ref_proc_start = os::elapsedTime(); |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5275 |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5276 ReferenceProcessor* rp = _ref_processor_stw; |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5277 assert(rp->discovery_enabled(), "should have been enabled"); |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5278 |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5279 // Any reference objects, in the collection set, that were 'discovered' |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5280 // 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
|
5281 // applying the external root copy closure to the discovered lists, or |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5282 // by following an RSet entry). |
|
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 // But some of the referents, that are in the collection set, that these |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5285 // 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
|
5286 // processor would have seen that the reference object had already |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5287 // been 'discovered' and would have skipped discovering the reference, |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5288 // 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
|
5289 // 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
|
5290 // referent object. |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5291 // |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5292 // We need to explicitly copy these referent objects - the references |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5293 // will be processed at the end of remarking. |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5294 // |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5295 // 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
|
5296 // 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
|
5297 // referents points to another object which is also referenced by an |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5298 // object discovered by the STW ref processor. |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5299 |
|
4728
441e946dc1af
7121618: Change type of number of GC workers to unsigned int.
jmasa
parents:
4711
diff
changeset
|
5300 uint active_workers = (G1CollectedHeap::use_parallel_gc_threads() ? |
|
4095
bca17e38de00
6593758: RFE: Enhance GC ergonomics to dynamically choose ParallelGCThreads
jmasa
parents:
4090
diff
changeset
|
5301 workers()->active_workers() : 1); |
|
bca17e38de00
6593758: RFE: Enhance GC ergonomics to dynamically choose ParallelGCThreads
jmasa
parents:
4090
diff
changeset
|
5302 |
| 4711 | 5303 assert(!G1CollectedHeap::use_parallel_gc_threads() || |
| 5304 active_workers == workers()->active_workers(), | |
| 5305 "Need to reset active_workers"); | |
| 5306 | |
|
4095
bca17e38de00
6593758: RFE: Enhance GC ergonomics to dynamically choose ParallelGCThreads
jmasa
parents:
4090
diff
changeset
|
5307 set_par_threads(active_workers); |
|
bca17e38de00
6593758: RFE: Enhance GC ergonomics to dynamically choose ParallelGCThreads
jmasa
parents:
4090
diff
changeset
|
5308 G1ParPreserveCMReferentsTask keep_cm_referents(this, active_workers, _task_queues); |
|
3979
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5309 |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5310 if (G1CollectedHeap::use_parallel_gc_threads()) { |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5311 workers()->run_task(&keep_cm_referents); |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5312 } else { |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5313 keep_cm_referents.work(0); |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5314 } |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5315 |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5316 set_par_threads(0); |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5317 |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5318 // Closure to test whether a referent is alive. |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5319 G1STWIsAliveClosure is_alive(this); |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5320 |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5321 // Even when parallel reference processing is enabled, the processing |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5322 // 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
|
5323 // 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
|
5324 // JNI refs. |
|
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 // Use only a single queue for this PSS. |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5327 G1ParScanThreadState pss(this, 0); |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5328 |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5329 // We do not embed a reference processor in the copying/scanning |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5330 // closures while we're actually processing the discovered |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5331 // reference objects. |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5332 G1ParScanHeapEvacClosure scan_evac_cl(this, &pss, NULL); |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5333 G1ParScanHeapEvacFailureClosure evac_failure_cl(this, &pss, NULL); |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5334 G1ParScanPartialArrayClosure partial_scan_cl(this, &pss, NULL); |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5335 |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5336 pss.set_evac_closure(&scan_evac_cl); |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5337 pss.set_evac_failure_closure(&evac_failure_cl); |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5338 pss.set_partial_scan_closure(&partial_scan_cl); |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5339 |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5340 assert(pss.refs()->is_empty(), "pre-condition"); |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5341 |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5342 G1ParScanExtRootClosure only_copy_non_heap_cl(this, &pss, NULL); |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5343 G1ParScanPermClosure only_copy_perm_cl(this, &pss, NULL); |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5344 |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5345 G1ParScanAndMarkExtRootClosure copy_mark_non_heap_cl(this, &pss, NULL); |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5346 G1ParScanAndMarkPermClosure copy_mark_perm_cl(this, &pss, NULL); |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5347 |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5348 OopClosure* copy_non_heap_cl = &only_copy_non_heap_cl; |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5349 OopsInHeapRegionClosure* copy_perm_cl = &only_copy_perm_cl; |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5350 |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5351 if (_g1h->g1_policy()->during_initial_mark_pause()) { |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5352 // We also need to mark copied objects. |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5353 copy_non_heap_cl = ©_mark_non_heap_cl; |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5354 copy_perm_cl = ©_mark_perm_cl; |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5355 } |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5356 |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5357 // Keep alive closure. |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5358 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
|
5359 |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5360 // Serial Complete GC closure |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5361 G1STWDrainQueueClosure drain_queue(this, &pss); |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5362 |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5363 // Setup the soft refs policy... |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5364 rp->setup_policy(false); |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5365 |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5366 if (!rp->processing_is_mt()) { |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5367 // Serial reference processing... |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5368 rp->process_discovered_references(&is_alive, |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5369 &keep_alive, |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5370 &drain_queue, |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5371 NULL); |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5372 } else { |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5373 // Parallel reference processing |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5374 assert(rp->num_q() == active_workers, "sanity"); |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5375 assert(active_workers <= rp->max_num_q(), "sanity"); |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5376 |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5377 G1STWRefProcTaskExecutor par_task_executor(this, workers(), _task_queues, active_workers); |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5378 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
|
5379 } |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5380 |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5381 // We have completed copying any necessary live referent objects |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5382 // (that were not copied during the actual pause) so we can |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5383 // retire any active alloc buffers |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5384 pss.retire_alloc_buffers(); |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5385 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
|
5386 |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5387 double ref_proc_time = os::elapsedTime() - ref_proc_start; |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5388 g1_policy()->record_ref_proc_time(ref_proc_time * 1000.0); |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5389 } |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5390 |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5391 // Weak Reference processing during an evacuation pause (part 2). |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5392 void G1CollectedHeap::enqueue_discovered_references() { |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5393 double ref_enq_start = os::elapsedTime(); |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5394 |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5395 ReferenceProcessor* rp = _ref_processor_stw; |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5396 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
|
5397 |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5398 // Now enqueue any remaining on the discovered lists on to |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5399 // the pending list. |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5400 if (!rp->processing_is_mt()) { |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5401 // Serial reference processing... |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5402 rp->enqueue_discovered_references(); |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5403 } else { |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5404 // Parallel reference enqueuing |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5405 |
|
4728
441e946dc1af
7121618: Change type of number of GC workers to unsigned int.
jmasa
parents:
4711
diff
changeset
|
5406 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
|
5407 assert(active_workers == workers()->active_workers(), |
|
bca17e38de00
6593758: RFE: Enhance GC ergonomics to dynamically choose ParallelGCThreads
jmasa
parents:
4090
diff
changeset
|
5408 "Need to reset active_workers"); |
|
3979
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5409 assert(rp->num_q() == active_workers, "sanity"); |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5410 assert(active_workers <= rp->max_num_q(), "sanity"); |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5411 |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5412 G1STWRefProcTaskExecutor par_task_executor(this, workers(), _task_queues, active_workers); |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5413 rp->enqueue_discovered_references(&par_task_executor); |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5414 } |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5415 |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5416 rp->verify_no_references_recorded(); |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5417 assert(!rp->discovery_enabled(), "should have been disabled"); |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5418 |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5419 // FIXME |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5420 // 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
|
5421 // 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
|
5422 // and could signicantly increase the pause time. |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5423 |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5424 double ref_enq_time = os::elapsedTime() - ref_enq_start; |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5425 g1_policy()->record_ref_enq_time(ref_enq_time * 1000.0); |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5426 } |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5427 |
| 342 | 5428 void G1CollectedHeap::evacuate_collection_set() { |
|
4781
bacb651cf5bf
7113006: G1: excessive ergo output when an evac failure happens
tonyp
parents:
4728
diff
changeset
|
5429 _expand_heap_after_alloc_failure = true; |
| 342 | 5430 set_evacuation_failed(false); |
| 5431 | |
| 5432 g1_rem_set()->prepare_for_oops_into_collection_set_do(); | |
| 5433 concurrent_g1_refine()->set_use_cache(false); | |
| 889 | 5434 concurrent_g1_refine()->clear_hot_cache_claimed_index(); |
| 5435 | |
|
4728
441e946dc1af
7121618: Change type of number of GC workers to unsigned int.
jmasa
parents:
4711
diff
changeset
|
5436 uint n_workers; |
|
4095
bca17e38de00
6593758: RFE: Enhance GC ergonomics to dynamically choose ParallelGCThreads
jmasa
parents:
4090
diff
changeset
|
5437 if (G1CollectedHeap::use_parallel_gc_threads()) { |
|
bca17e38de00
6593758: RFE: Enhance GC ergonomics to dynamically choose ParallelGCThreads
jmasa
parents:
4090
diff
changeset
|
5438 n_workers = |
|
bca17e38de00
6593758: RFE: Enhance GC ergonomics to dynamically choose ParallelGCThreads
jmasa
parents:
4090
diff
changeset
|
5439 AdaptiveSizePolicy::calc_active_workers(workers()->total_workers(), |
|
bca17e38de00
6593758: RFE: Enhance GC ergonomics to dynamically choose ParallelGCThreads
jmasa
parents:
4090
diff
changeset
|
5440 workers()->active_workers(), |
|
bca17e38de00
6593758: RFE: Enhance GC ergonomics to dynamically choose ParallelGCThreads
jmasa
parents:
4090
diff
changeset
|
5441 Threads::number_of_non_daemon_threads()); |
|
bca17e38de00
6593758: RFE: Enhance GC ergonomics to dynamically choose ParallelGCThreads
jmasa
parents:
4090
diff
changeset
|
5442 assert(UseDynamicNumberOfGCThreads || |
|
bca17e38de00
6593758: RFE: Enhance GC ergonomics to dynamically choose ParallelGCThreads
jmasa
parents:
4090
diff
changeset
|
5443 n_workers == workers()->total_workers(), |
|
bca17e38de00
6593758: RFE: Enhance GC ergonomics to dynamically choose ParallelGCThreads
jmasa
parents:
4090
diff
changeset
|
5444 "If not dynamic should be using all the workers"); |
| 4711 | 5445 workers()->set_active_workers(n_workers); |
|
4095
bca17e38de00
6593758: RFE: Enhance GC ergonomics to dynamically choose ParallelGCThreads
jmasa
parents:
4090
diff
changeset
|
5446 set_par_threads(n_workers); |
|
bca17e38de00
6593758: RFE: Enhance GC ergonomics to dynamically choose ParallelGCThreads
jmasa
parents:
4090
diff
changeset
|
5447 } else { |
|
bca17e38de00
6593758: RFE: Enhance GC ergonomics to dynamically choose ParallelGCThreads
jmasa
parents:
4090
diff
changeset
|
5448 assert(n_par_threads() == 0, |
|
bca17e38de00
6593758: RFE: Enhance GC ergonomics to dynamically choose ParallelGCThreads
jmasa
parents:
4090
diff
changeset
|
5449 "Should be the original non-parallel value"); |
|
bca17e38de00
6593758: RFE: Enhance GC ergonomics to dynamically choose ParallelGCThreads
jmasa
parents:
4090
diff
changeset
|
5450 n_workers = 1; |
|
bca17e38de00
6593758: RFE: Enhance GC ergonomics to dynamically choose ParallelGCThreads
jmasa
parents:
4090
diff
changeset
|
5451 } |
|
bca17e38de00
6593758: RFE: Enhance GC ergonomics to dynamically choose ParallelGCThreads
jmasa
parents:
4090
diff
changeset
|
5452 |
|
bca17e38de00
6593758: RFE: Enhance GC ergonomics to dynamically choose ParallelGCThreads
jmasa
parents:
4090
diff
changeset
|
5453 G1ParTask g1_par_task(this, _task_queues); |
| 342 | 5454 |
| 5455 init_for_evac_failure(NULL); | |
| 5456 | |
| 5457 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
|
5458 |
|
4f360ec815ba
6720309: G1: don't synchronously update RSet during evacuation pauses
iveresov
parents:
595
diff
changeset
|
5459 assert(dirty_card_queue_set().completed_buffers_num() == 0, "Should be empty"); |
|
5986
500023bd0818
7143511: G1: Another instance of high GC Worker Other time (50ms)
johnc
parents:
5963
diff
changeset
|
5460 double start_par_time_sec = os::elapsedTime(); |
|
500023bd0818
7143511: G1: Another instance of high GC Worker Other time (50ms)
johnc
parents:
5963
diff
changeset
|
5461 double end_par_time_sec; |
|
500023bd0818
7143511: G1: Another instance of high GC Worker Other time (50ms)
johnc
parents:
5963
diff
changeset
|
5462 |
|
500023bd0818
7143511: G1: Another instance of high GC Worker Other time (50ms)
johnc
parents:
5963
diff
changeset
|
5463 { |
|
989
148e5441d916
6863023: need non-perm oops in code cache for JSR 292
jrose
parents:
890
diff
changeset
|
5464 StrongRootsScope srs(this); |
|
5986
500023bd0818
7143511: G1: Another instance of high GC Worker Other time (50ms)
johnc
parents:
5963
diff
changeset
|
5465 |
|
500023bd0818
7143511: G1: Another instance of high GC Worker Other time (50ms)
johnc
parents:
5963
diff
changeset
|
5466 if (G1CollectedHeap::use_parallel_gc_threads()) { |
|
500023bd0818
7143511: G1: Another instance of high GC Worker Other time (50ms)
johnc
parents:
5963
diff
changeset
|
5467 // The individual threads will set their evac-failure closures. |
|
500023bd0818
7143511: G1: Another instance of high GC Worker Other time (50ms)
johnc
parents:
5963
diff
changeset
|
5468 if (ParallelGCVerbose) G1ParScanThreadState::print_termination_stats_hdr(); |
|
500023bd0818
7143511: G1: Another instance of high GC Worker Other time (50ms)
johnc
parents:
5963
diff
changeset
|
5469 // These tasks use ShareHeap::_process_strong_tasks |
|
500023bd0818
7143511: G1: Another instance of high GC Worker Other time (50ms)
johnc
parents:
5963
diff
changeset
|
5470 assert(UseDynamicNumberOfGCThreads || |
|
500023bd0818
7143511: G1: Another instance of high GC Worker Other time (50ms)
johnc
parents:
5963
diff
changeset
|
5471 workers()->active_workers() == workers()->total_workers(), |
|
500023bd0818
7143511: G1: Another instance of high GC Worker Other time (50ms)
johnc
parents:
5963
diff
changeset
|
5472 "If not dynamic should be using all the workers"); |
|
500023bd0818
7143511: G1: Another instance of high GC Worker Other time (50ms)
johnc
parents:
5963
diff
changeset
|
5473 workers()->run_task(&g1_par_task); |
|
500023bd0818
7143511: G1: Another instance of high GC Worker Other time (50ms)
johnc
parents:
5963
diff
changeset
|
5474 } else { |
|
500023bd0818
7143511: G1: Another instance of high GC Worker Other time (50ms)
johnc
parents:
5963
diff
changeset
|
5475 g1_par_task.set_for_termination(n_workers); |
|
500023bd0818
7143511: G1: Another instance of high GC Worker Other time (50ms)
johnc
parents:
5963
diff
changeset
|
5476 g1_par_task.work(0); |
|
500023bd0818
7143511: G1: Another instance of high GC Worker Other time (50ms)
johnc
parents:
5963
diff
changeset
|
5477 } |
|
500023bd0818
7143511: G1: Another instance of high GC Worker Other time (50ms)
johnc
parents:
5963
diff
changeset
|
5478 end_par_time_sec = os::elapsedTime(); |
|
500023bd0818
7143511: G1: Another instance of high GC Worker Other time (50ms)
johnc
parents:
5963
diff
changeset
|
5479 |
|
500023bd0818
7143511: G1: Another instance of high GC Worker Other time (50ms)
johnc
parents:
5963
diff
changeset
|
5480 // Closing the inner scope will execute the destructor |
|
500023bd0818
7143511: G1: Another instance of high GC Worker Other time (50ms)
johnc
parents:
5963
diff
changeset
|
5481 // for the StrongRootsScope object. We record the current |
|
500023bd0818
7143511: G1: Another instance of high GC Worker Other time (50ms)
johnc
parents:
5963
diff
changeset
|
5482 // elapsed time before closing the scope so that time |
|
500023bd0818
7143511: G1: Another instance of high GC Worker Other time (50ms)
johnc
parents:
5963
diff
changeset
|
5483 // taken for the SRS destructor is NOT included in the |
|
500023bd0818
7143511: G1: Another instance of high GC Worker Other time (50ms)
johnc
parents:
5963
diff
changeset
|
5484 // reported parallel time. |
|
500023bd0818
7143511: G1: Another instance of high GC Worker Other time (50ms)
johnc
parents:
5963
diff
changeset
|
5485 } |
|
500023bd0818
7143511: G1: Another instance of high GC Worker Other time (50ms)
johnc
parents:
5963
diff
changeset
|
5486 |
|
500023bd0818
7143511: G1: Another instance of high GC Worker Other time (50ms)
johnc
parents:
5963
diff
changeset
|
5487 double par_time_ms = (end_par_time_sec - start_par_time_sec) * 1000.0; |
|
500023bd0818
7143511: G1: Another instance of high GC Worker Other time (50ms)
johnc
parents:
5963
diff
changeset
|
5488 g1_policy()->record_par_time(par_time_ms); |
|
500023bd0818
7143511: G1: Another instance of high GC Worker Other time (50ms)
johnc
parents:
5963
diff
changeset
|
5489 |
|
500023bd0818
7143511: G1: Another instance of high GC Worker Other time (50ms)
johnc
parents:
5963
diff
changeset
|
5490 double code_root_fixup_time_ms = |
|
500023bd0818
7143511: G1: Another instance of high GC Worker Other time (50ms)
johnc
parents:
5963
diff
changeset
|
5491 (os::elapsedTime() - end_par_time_sec) * 1000.0; |
|
500023bd0818
7143511: G1: Another instance of high GC Worker Other time (50ms)
johnc
parents:
5963
diff
changeset
|
5492 g1_policy()->record_code_root_fixup_time(code_root_fixup_time_ms); |
|
4095
bca17e38de00
6593758: RFE: Enhance GC ergonomics to dynamically choose ParallelGCThreads
jmasa
parents:
4090
diff
changeset
|
5493 |
| 342 | 5494 set_par_threads(0); |
|
1974
fd1d227ef1b9
6983204: G1: Nightly test nsk/regression/b4958615 failing with +ExplicitGCInvokesConcurrent
johnc
parents:
1973
diff
changeset
|
5495 |
|
3979
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5496 // Process any discovered reference objects - we have |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5497 // to do this _before_ we retire the GC alloc regions |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5498 // as we may have to copy some 'reachable' referent |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5499 // objects (and their reachable sub-graphs) that were |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5500 // not copied during the pause. |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5501 process_discovered_references(); |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5502 |
|
1974
fd1d227ef1b9
6983204: G1: Nightly test nsk/regression/b4958615 failing with +ExplicitGCInvokesConcurrent
johnc
parents:
1973
diff
changeset
|
5503 // Weak root processing. |
|
fd1d227ef1b9
6983204: G1: Nightly test nsk/regression/b4958615 failing with +ExplicitGCInvokesConcurrent
johnc
parents:
1973
diff
changeset
|
5504 // 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
|
5505 // 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
|
5506 // here too. |
| 342 | 5507 { |
|
3979
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5508 G1STWIsAliveClosure is_alive(this); |
| 342 | 5509 G1KeepAliveClosure keep_alive(this); |
| 5510 JNIHandles::weak_oops_do(&is_alive, &keep_alive); | |
| 5511 } | |
|
3979
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5512 |
|
3830
f44782f04dd4
7039627: G1: avoid BOT updates for survivor allocations and dirty survivor regions incrementally
tonyp
parents:
3824
diff
changeset
|
5513 release_gc_alloc_regions(); |
| 342 | 5514 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
|
5515 |
| 889 | 5516 concurrent_g1_refine()->clear_hot_cache(); |
| 342 | 5517 concurrent_g1_refine()->set_use_cache(true); |
| 5518 | |
| 5519 finalize_for_evac_failure(); | |
| 5520 | |
| 5521 if (evacuation_failed()) { | |
| 5522 remove_self_forwarding_pointers(); | |
|
6007
5c86f8211d1e
7160728: Introduce an extra logging level for G1 logging
brutisso
parents:
5987
diff
changeset
|
5523 if (G1Log::finer()) { |
| 6059 | 5524 gclog_or_tty->print(" (to-space exhausted)"); |
|
6007
5c86f8211d1e
7160728: Introduce an extra logging level for G1 logging
brutisso
parents:
5987
diff
changeset
|
5525 } else if (G1Log::fine()) { |
| 342 | 5526 gclog_or_tty->print("--"); |
| 5527 } | |
| 5528 } | |
| 5529 | |
|
3979
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5530 // Enqueue any remaining references remaining on the STW |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5531 // reference processor's discovered lists. We need to do |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5532 // this after the card table is cleaned (and verified) as |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5533 // the act of enqueuing entries on to the pending list |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5534 // will log these updates (and dirty their associated |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5535 // cards). We need these updates logged to update any |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5536 // RSets. |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5537 enqueue_discovered_references(); |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5538 |
|
616
4f360ec815ba
6720309: G1: don't synchronously update RSet during evacuation pauses
iveresov
parents:
595
diff
changeset
|
5539 if (G1DeferredRSUpdate) { |
|
4f360ec815ba
6720309: G1: don't synchronously update RSet during evacuation pauses
iveresov
parents:
595
diff
changeset
|
5540 RedirtyLoggedCardTableEntryFastClosure redirty; |
|
4f360ec815ba
6720309: G1: don't synchronously update RSet during evacuation pauses
iveresov
parents:
595
diff
changeset
|
5541 dirty_card_queue_set().set_closure(&redirty); |
|
4f360ec815ba
6720309: G1: don't synchronously update RSet during evacuation pauses
iveresov
parents:
595
diff
changeset
|
5542 dirty_card_queue_set().apply_closure_to_all_completed_buffers(); |
| 1111 | 5543 |
| 5544 DirtyCardQueueSet& dcq = JavaThread::dirty_card_queue_set(); | |
| 5545 dcq.merge_bufferlists(&dirty_card_queue_set()); | |
|
616
4f360ec815ba
6720309: G1: don't synchronously update RSet during evacuation pauses
iveresov
parents:
595
diff
changeset
|
5546 assert(dirty_card_queue_set().completed_buffers_num() == 0, "All should be consumed"); |
|
4f360ec815ba
6720309: G1: don't synchronously update RSet during evacuation pauses
iveresov
parents:
595
diff
changeset
|
5547 } |
| 342 | 5548 COMPILER2_PRESENT(DerivedPointerTable::update_pointers()); |
| 5549 } | |
| 5550 | |
| 2173 | 5551 void G1CollectedHeap::free_region_if_empty(HeapRegion* hr, |
| 2152 | 5552 size_t* pre_used, |
| 5553 FreeRegionList* free_list, | |
| 4072 | 5554 OldRegionSet* old_proxy_set, |
| 2152 | 5555 HumongousRegionSet* humongous_proxy_set, |
| 2173 | 5556 HRRSCleanupTask* hrrs_cleanup_task, |
| 2152 | 5557 bool par) { |
| 5558 if (hr->used() > 0 && hr->max_live_bytes() == 0 && !hr->is_young()) { | |
| 5559 if (hr->isHumongous()) { | |
| 5560 assert(hr->startsHumongous(), "we should only see starts humongous"); | |
| 5561 free_humongous_region(hr, pre_used, free_list, humongous_proxy_set, par); | |
| 5562 } else { | |
| 4072 | 5563 _old_set.remove_with_proxy(hr, old_proxy_set); |
| 2152 | 5564 free_region(hr, pre_used, free_list, par); |
| 342 | 5565 } |
| 2173 | 5566 } else { |
| 5567 hr->rem_set()->do_cleanup_work(hrrs_cleanup_task); | |
| 342 | 5568 } |
| 5569 } | |
| 5570 | |
| 2152 | 5571 void G1CollectedHeap::free_region(HeapRegion* hr, |
| 5572 size_t* pre_used, | |
| 5573 FreeRegionList* free_list, | |
| 5574 bool par) { | |
| 5575 assert(!hr->isHumongous(), "this is only for non-humongous regions"); | |
| 5576 assert(!hr->is_empty(), "the region should not be empty"); | |
| 5577 assert(free_list != NULL, "pre-condition"); | |
| 5578 | |
| 5579 *pre_used += hr->used(); | |
| 5580 hr->hr_clear(par, true /* clear_space */); | |
|
2432
455328d90876
7029458: G1: Add newly-reclaimed regions to the beginning of the region free list, not the end
tonyp
parents:
2369
diff
changeset
|
5581 free_list->add_as_head(hr); |
| 2152 | 5582 } |
| 5583 | |
| 5584 void G1CollectedHeap::free_humongous_region(HeapRegion* hr, | |
| 5585 size_t* pre_used, | |
| 5586 FreeRegionList* free_list, | |
| 5587 HumongousRegionSet* humongous_proxy_set, | |
| 5588 bool par) { | |
| 5589 assert(hr->startsHumongous(), "this is only for starts humongous regions"); | |
| 5590 assert(free_list != NULL, "pre-condition"); | |
| 5591 assert(humongous_proxy_set != NULL, "pre-condition"); | |
| 5592 | |
| 5593 size_t hr_used = hr->used(); | |
| 5594 size_t hr_capacity = hr->capacity(); | |
| 5595 size_t hr_pre_used = 0; | |
| 5596 _humongous_set.remove_with_proxy(hr, humongous_proxy_set); | |
| 5597 hr->set_notHumongous(); | |
| 5598 free_region(hr, &hr_pre_used, free_list, par); | |
| 5599 | |
|
6010
720b6a76dd9d
7157073: G1: type change size_t -> uint for region counts / indexes
tonyp
parents:
6008
diff
changeset
|
5600 uint i = hr->hrs_index() + 1; |
|
720b6a76dd9d
7157073: G1: type change size_t -> uint for region counts / indexes
tonyp
parents:
6008
diff
changeset
|
5601 uint num = 1; |
| 3766 | 5602 while (i < n_regions()) { |
| 5603 HeapRegion* curr_hr = region_at(i); | |
| 2152 | 5604 if (!curr_hr->continuesHumongous()) { |
| 5605 break; | |
| 5606 } | |
| 5607 curr_hr->set_notHumongous(); | |
| 5608 free_region(curr_hr, &hr_pre_used, free_list, par); | |
| 5609 num += 1; | |
| 5610 i += 1; | |
| 5611 } | |
| 5612 assert(hr_pre_used == hr_used, | |
| 5613 err_msg("hr_pre_used: "SIZE_FORMAT" and hr_used: "SIZE_FORMAT" " | |
| 5614 "should be the same", hr_pre_used, hr_used)); | |
| 5615 *pre_used += hr_pre_used; | |
| 5616 } | |
| 5617 | |
| 5618 void G1CollectedHeap::update_sets_after_freeing_regions(size_t pre_used, | |
| 5619 FreeRegionList* free_list, | |
| 4072 | 5620 OldRegionSet* old_proxy_set, |
| 2152 | 5621 HumongousRegionSet* humongous_proxy_set, |
| 5622 bool par) { | |
| 5623 if (pre_used > 0) { | |
| 5624 Mutex* lock = (par) ? ParGCRareEvent_lock : NULL; | |
| 342 | 5625 MutexLockerEx x(lock, Mutex::_no_safepoint_check_flag); |
| 2152 | 5626 assert(_summary_bytes_used >= pre_used, |
| 5627 err_msg("invariant: _summary_bytes_used: "SIZE_FORMAT" " | |
| 5628 "should be >= pre_used: "SIZE_FORMAT, | |
| 5629 _summary_bytes_used, pre_used)); | |
| 342 | 5630 _summary_bytes_used -= pre_used; |
| 2152 | 5631 } |
| 5632 if (free_list != NULL && !free_list->is_empty()) { | |
| 5633 MutexLockerEx x(FreeList_lock, Mutex::_no_safepoint_check_flag); | |
|
2432
455328d90876
7029458: G1: Add newly-reclaimed regions to the beginning of the region free list, not the end
tonyp
parents:
2369
diff
changeset
|
5634 _free_list.add_as_head(free_list); |
| 2152 | 5635 } |
| 4072 | 5636 if (old_proxy_set != NULL && !old_proxy_set->is_empty()) { |
| 5637 MutexLockerEx x(OldSets_lock, Mutex::_no_safepoint_check_flag); | |
| 5638 _old_set.update_from_proxy(old_proxy_set); | |
| 5639 } | |
| 2152 | 5640 if (humongous_proxy_set != NULL && !humongous_proxy_set->is_empty()) { |
| 5641 MutexLockerEx x(OldSets_lock, Mutex::_no_safepoint_check_flag); | |
| 5642 _humongous_set.update_from_proxy(humongous_proxy_set); | |
| 342 | 5643 } |
| 5644 } | |
| 5645 | |
|
796
29e7d79232b9
6819065: G1: eliminate high serial card table clearing time
apetrusenko
parents:
794
diff
changeset
|
5646 class G1ParCleanupCTTask : public AbstractGangTask { |
|
29e7d79232b9
6819065: G1: eliminate high serial card table clearing time
apetrusenko
parents:
794
diff
changeset
|
5647 CardTableModRefBS* _ct_bs; |
|
29e7d79232b9
6819065: G1: eliminate high serial card table clearing time
apetrusenko
parents:
794
diff
changeset
|
5648 G1CollectedHeap* _g1h; |
|
940
8624da129f0b
6841313: G1: dirty cards of survivor regions in parallel
apetrusenko
parents:
936
diff
changeset
|
5649 HeapRegion* volatile _su_head; |
|
796
29e7d79232b9
6819065: G1: eliminate high serial card table clearing time
apetrusenko
parents:
794
diff
changeset
|
5650 public: |
|
29e7d79232b9
6819065: G1: eliminate high serial card table clearing time
apetrusenko
parents:
794
diff
changeset
|
5651 G1ParCleanupCTTask(CardTableModRefBS* ct_bs, |
|
3830
f44782f04dd4
7039627: G1: avoid BOT updates for survivor allocations and dirty survivor regions incrementally
tonyp
parents:
3824
diff
changeset
|
5652 G1CollectedHeap* g1h) : |
|
796
29e7d79232b9
6819065: G1: eliminate high serial card table clearing time
apetrusenko
parents:
794
diff
changeset
|
5653 AbstractGangTask("G1 Par Cleanup CT Task"), |
|
3830
f44782f04dd4
7039627: G1: avoid BOT updates for survivor allocations and dirty survivor regions incrementally
tonyp
parents:
3824
diff
changeset
|
5654 _ct_bs(ct_bs), _g1h(g1h) { } |
|
796
29e7d79232b9
6819065: G1: eliminate high serial card table clearing time
apetrusenko
parents:
794
diff
changeset
|
5655 |
|
4728
441e946dc1af
7121618: Change type of number of GC workers to unsigned int.
jmasa
parents:
4711
diff
changeset
|
5656 void work(uint worker_id) { |
|
796
29e7d79232b9
6819065: G1: eliminate high serial card table clearing time
apetrusenko
parents:
794
diff
changeset
|
5657 HeapRegion* r; |
|
29e7d79232b9
6819065: G1: eliminate high serial card table clearing time
apetrusenko
parents:
794
diff
changeset
|
5658 while (r = _g1h->pop_dirty_cards_region()) { |
|
29e7d79232b9
6819065: G1: eliminate high serial card table clearing time
apetrusenko
parents:
794
diff
changeset
|
5659 clear_cards(r); |
|
29e7d79232b9
6819065: G1: eliminate high serial card table clearing time
apetrusenko
parents:
794
diff
changeset
|
5660 } |
|
940
8624da129f0b
6841313: G1: dirty cards of survivor regions in parallel
apetrusenko
parents:
936
diff
changeset
|
5661 } |
|
8624da129f0b
6841313: G1: dirty cards of survivor regions in parallel
apetrusenko
parents:
936
diff
changeset
|
5662 |
|
796
29e7d79232b9
6819065: G1: eliminate high serial card table clearing time
apetrusenko
parents:
794
diff
changeset
|
5663 void clear_cards(HeapRegion* r) { |
|
3830
f44782f04dd4
7039627: G1: avoid BOT updates for survivor allocations and dirty survivor regions incrementally
tonyp
parents:
3824
diff
changeset
|
5664 // Cards of the survivors should have already been dirtied. |
|
1394
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
5665 if (!r->is_survivor()) { |
|
796
29e7d79232b9
6819065: G1: eliminate high serial card table clearing time
apetrusenko
parents:
794
diff
changeset
|
5666 _ct_bs->clear(MemRegion(r->bottom(), r->end())); |
|
29e7d79232b9
6819065: G1: eliminate high serial card table clearing time
apetrusenko
parents:
794
diff
changeset
|
5667 } |
|
29e7d79232b9
6819065: G1: eliminate high serial card table clearing time
apetrusenko
parents:
794
diff
changeset
|
5668 } |
|
29e7d79232b9
6819065: G1: eliminate high serial card table clearing time
apetrusenko
parents:
794
diff
changeset
|
5669 }; |
|
29e7d79232b9
6819065: G1: eliminate high serial card table clearing time
apetrusenko
parents:
794
diff
changeset
|
5670 |
|
940
8624da129f0b
6841313: G1: dirty cards of survivor regions in parallel
apetrusenko
parents:
936
diff
changeset
|
5671 #ifndef PRODUCT |
|
8624da129f0b
6841313: G1: dirty cards of survivor regions in parallel
apetrusenko
parents:
936
diff
changeset
|
5672 class G1VerifyCardTableCleanup: public HeapRegionClosure { |
|
3317
063382f9b575
7035144: G1: nightly failure: Non-dirty cards in region that should be dirty (failures still exist...)
tonyp
parents:
3293
diff
changeset
|
5673 G1CollectedHeap* _g1h; |
|
940
8624da129f0b
6841313: G1: dirty cards of survivor regions in parallel
apetrusenko
parents:
936
diff
changeset
|
5674 CardTableModRefBS* _ct_bs; |
|
8624da129f0b
6841313: G1: dirty cards of survivor regions in parallel
apetrusenko
parents:
936
diff
changeset
|
5675 public: |
|
3317
063382f9b575
7035144: G1: nightly failure: Non-dirty cards in region that should be dirty (failures still exist...)
tonyp
parents:
3293
diff
changeset
|
5676 G1VerifyCardTableCleanup(G1CollectedHeap* g1h, CardTableModRefBS* ct_bs) |
|
063382f9b575
7035144: G1: nightly failure: Non-dirty cards in region that should be dirty (failures still exist...)
tonyp
parents:
3293
diff
changeset
|
5677 : _g1h(g1h), _ct_bs(ct_bs) { } |
|
2433
abdfc822206f
7023069: G1: Introduce symmetric locking in the slow allocation path
tonyp
parents:
2432
diff
changeset
|
5678 virtual bool doHeapRegion(HeapRegion* r) { |
|
1394
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
5679 if (r->is_survivor()) { |
|
3317
063382f9b575
7035144: G1: nightly failure: Non-dirty cards in region that should be dirty (failures still exist...)
tonyp
parents:
3293
diff
changeset
|
5680 _g1h->verify_dirty_region(r); |
|
940
8624da129f0b
6841313: G1: dirty cards of survivor regions in parallel
apetrusenko
parents:
936
diff
changeset
|
5681 } else { |
|
3317
063382f9b575
7035144: G1: nightly failure: Non-dirty cards in region that should be dirty (failures still exist...)
tonyp
parents:
3293
diff
changeset
|
5682 _g1h->verify_not_dirty_region(r); |
|
940
8624da129f0b
6841313: G1: dirty cards of survivor regions in parallel
apetrusenko
parents:
936
diff
changeset
|
5683 } |
|
8624da129f0b
6841313: G1: dirty cards of survivor regions in parallel
apetrusenko
parents:
936
diff
changeset
|
5684 return false; |
|
8624da129f0b
6841313: G1: dirty cards of survivor regions in parallel
apetrusenko
parents:
936
diff
changeset
|
5685 } |
|
8624da129f0b
6841313: G1: dirty cards of survivor regions in parallel
apetrusenko
parents:
936
diff
changeset
|
5686 }; |
|
2433
abdfc822206f
7023069: G1: Introduce symmetric locking in the slow allocation path
tonyp
parents:
2432
diff
changeset
|
5687 |
|
3317
063382f9b575
7035144: G1: nightly failure: Non-dirty cards in region that should be dirty (failures still exist...)
tonyp
parents:
3293
diff
changeset
|
5688 void G1CollectedHeap::verify_not_dirty_region(HeapRegion* hr) { |
|
063382f9b575
7035144: G1: nightly failure: Non-dirty cards in region that should be dirty (failures still exist...)
tonyp
parents:
3293
diff
changeset
|
5689 // All of the region should be clean. |
|
063382f9b575
7035144: G1: nightly failure: Non-dirty cards in region that should be dirty (failures still exist...)
tonyp
parents:
3293
diff
changeset
|
5690 CardTableModRefBS* ct_bs = (CardTableModRefBS*)barrier_set(); |
|
063382f9b575
7035144: G1: nightly failure: Non-dirty cards in region that should be dirty (failures still exist...)
tonyp
parents:
3293
diff
changeset
|
5691 MemRegion mr(hr->bottom(), hr->end()); |
|
063382f9b575
7035144: G1: nightly failure: Non-dirty cards in region that should be dirty (failures still exist...)
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3293
diff
changeset
|
5692 ct_bs->verify_not_dirty_region(mr); |
|
063382f9b575
7035144: G1: nightly failure: Non-dirty cards in region that should be dirty (failures still exist...)
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parents:
3293
diff
changeset
|
5693 } |
|
063382f9b575
7035144: G1: nightly failure: Non-dirty cards in region that should be dirty (failures still exist...)
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diff
changeset
|
5694 |
|
063382f9b575
7035144: G1: nightly failure: Non-dirty cards in region that should be dirty (failures still exist...)
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parents:
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diff
changeset
|
5695 void G1CollectedHeap::verify_dirty_region(HeapRegion* hr) { |
|
063382f9b575
7035144: G1: nightly failure: Non-dirty cards in region that should be dirty (failures still exist...)
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parents:
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diff
changeset
|
5696 // We cannot guarantee that [bottom(),end()] is dirty. Threads |
|
063382f9b575
7035144: G1: nightly failure: Non-dirty cards in region that should be dirty (failures still exist...)
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diff
changeset
|
5697 // dirty allocated blocks as they allocate them. The thread that |
|
063382f9b575
7035144: G1: nightly failure: Non-dirty cards in region that should be dirty (failures still exist...)
tonyp
parents:
3293
diff
changeset
|
5698 // retires each region and replaces it with a new one will do a |
|
063382f9b575
7035144: G1: nightly failure: Non-dirty cards in region that should be dirty (failures still exist...)
tonyp
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diff
changeset
|
5699 // maximal allocation to fill in [pre_dummy_top(),end()] but will |
|
063382f9b575
7035144: G1: nightly failure: Non-dirty cards in region that should be dirty (failures still exist...)
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changeset
|
5700 // not dirty that area (one less thing to have to do while holding |
|
063382f9b575
7035144: G1: nightly failure: Non-dirty cards in region that should be dirty (failures still exist...)
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changeset
|
5701 // a lock). So we can only verify that [bottom(),pre_dummy_top()] |
|
063382f9b575
7035144: G1: nightly failure: Non-dirty cards in region that should be dirty (failures still exist...)
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diff
changeset
|
5702 // is dirty. |
|
063382f9b575
7035144: G1: nightly failure: Non-dirty cards in region that should be dirty (failures still exist...)
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parents:
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changeset
|
5703 CardTableModRefBS* ct_bs = (CardTableModRefBS*) barrier_set(); |
|
063382f9b575
7035144: G1: nightly failure: Non-dirty cards in region that should be dirty (failures still exist...)
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changeset
|
5704 MemRegion mr(hr->bottom(), hr->pre_dummy_top()); |
|
063382f9b575
7035144: G1: nightly failure: Non-dirty cards in region that should be dirty (failures still exist...)
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|
5705 ct_bs->verify_dirty_region(mr); |
|
063382f9b575
7035144: G1: nightly failure: Non-dirty cards in region that should be dirty (failures still exist...)
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|
5706 } |
|
063382f9b575
7035144: G1: nightly failure: Non-dirty cards in region that should be dirty (failures still exist...)
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diff
changeset
|
5707 |
|
2433
abdfc822206f
7023069: G1: Introduce symmetric locking in the slow allocation path
tonyp
parents:
2432
diff
changeset
|
5708 void G1CollectedHeap::verify_dirty_young_list(HeapRegion* head) { |
|
3317
063382f9b575
7035144: G1: nightly failure: Non-dirty cards in region that should be dirty (failures still exist...)
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changeset
|
5709 CardTableModRefBS* ct_bs = (CardTableModRefBS*) barrier_set(); |
|
2433
abdfc822206f
7023069: G1: Introduce symmetric locking in the slow allocation path
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changeset
|
5710 for (HeapRegion* hr = head; hr != NULL; hr = hr->get_next_young_region()) { |
|
3317
063382f9b575
7035144: G1: nightly failure: Non-dirty cards in region that should be dirty (failures still exist...)
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|
5711 verify_dirty_region(hr); |
|
2433
abdfc822206f
7023069: G1: Introduce symmetric locking in the slow allocation path
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diff
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|
5712 } |
|
abdfc822206f
7023069: G1: Introduce symmetric locking in the slow allocation path
tonyp
parents:
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diff
changeset
|
5713 } |
|
abdfc822206f
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tonyp
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diff
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|
5714 |
|
abdfc822206f
7023069: G1: Introduce symmetric locking in the slow allocation path
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diff
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|
5715 void G1CollectedHeap::verify_dirty_young_regions() { |
|
abdfc822206f
7023069: G1: Introduce symmetric locking in the slow allocation path
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|
5716 verify_dirty_young_list(_young_list->first_region()); |
|
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|
5717 verify_dirty_young_list(_young_list->first_survivor_region()); |
|
abdfc822206f
7023069: G1: Introduce symmetric locking in the slow allocation path
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|
5718 } |
|
940
8624da129f0b
6841313: G1: dirty cards of survivor regions in parallel
apetrusenko
parents:
936
diff
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|
5719 #endif |
|
8624da129f0b
6841313: G1: dirty cards of survivor regions in parallel
apetrusenko
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|
5720 |
| 342 | 5721 void G1CollectedHeap::cleanUpCardTable() { |
| 5722 CardTableModRefBS* ct_bs = (CardTableModRefBS*) (barrier_set()); | |
| 5723 double start = os::elapsedTime(); | |
| 5724 | |
| 4023 | 5725 { |
| 5726 // Iterate over the dirty cards region list. | |
| 5727 G1ParCleanupCTTask cleanup_task(ct_bs, this); | |
| 5728 | |
| 4711 | 5729 if (G1CollectedHeap::use_parallel_gc_threads()) { |
| 5730 set_par_threads(); | |
| 4023 | 5731 workers()->run_task(&cleanup_task); |
| 5732 set_par_threads(0); | |
| 5733 } else { | |
| 5734 while (_dirty_cards_region_list) { | |
| 5735 HeapRegion* r = _dirty_cards_region_list; | |
| 5736 cleanup_task.clear_cards(r); | |
| 5737 _dirty_cards_region_list = r->get_next_dirty_cards_region(); | |
| 5738 if (_dirty_cards_region_list == r) { | |
| 5739 // The last region. | |
| 5740 _dirty_cards_region_list = NULL; | |
| 5741 } | |
| 5742 r->set_next_dirty_cards_region(NULL); | |
|
796
29e7d79232b9
6819065: G1: eliminate high serial card table clearing time
apetrusenko
parents:
794
diff
changeset
|
5743 } |
|
29e7d79232b9
6819065: G1: eliminate high serial card table clearing time
apetrusenko
parents:
794
diff
changeset
|
5744 } |
| 4023 | 5745 #ifndef PRODUCT |
| 5746 if (G1VerifyCTCleanup || VerifyAfterGC) { | |
| 5747 G1VerifyCardTableCleanup cleanup_verifier(this, ct_bs); | |
| 5748 heap_region_iterate(&cleanup_verifier); | |
| 5749 } | |
| 5750 #endif | |
|
940
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6841313: G1: dirty cards of survivor regions in parallel
apetrusenko
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936
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|
5751 } |
|
1394
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6819061: G1: eliminate serial Other times that are proportional to the collection set length
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|
5752 |
| 342 | 5753 double elapsed = os::elapsedTime() - start; |
|
3979
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5754 g1_policy()->record_clear_ct_time(elapsed * 1000.0); |
| 342 | 5755 } |
| 5756 | |
| 5757 void G1CollectedHeap::free_collection_set(HeapRegion* cs_head) { | |
| 2152 | 5758 size_t pre_used = 0; |
| 5759 FreeRegionList local_free_list("Local List for CSet Freeing"); | |
| 5760 | |
| 342 | 5761 double young_time_ms = 0.0; |
| 5762 double non_young_time_ms = 0.0; | |
| 5763 | |
|
1394
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
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diff
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|
5764 // Since the collection set is a superset of the the young list, |
|
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
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1391
diff
changeset
|
5765 // all we need to do to clear the young list is clear its |
|
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
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changeset
|
5766 // head and length, and unlink any young regions in the code below |
|
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
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parents:
1391
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|
5767 _young_list->clear(); |
|
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6819061: G1: eliminate serial Other times that are proportional to the collection set length
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|
5768 |
| 342 | 5769 G1CollectorPolicy* policy = g1_policy(); |
| 5770 | |
| 5771 double start_sec = os::elapsedTime(); | |
| 5772 bool non_young = true; | |
| 5773 | |
| 5774 HeapRegion* cur = cs_head; | |
| 5775 int age_bound = -1; | |
| 5776 size_t rs_lengths = 0; | |
| 5777 | |
| 5778 while (cur != NULL) { | |
| 2361 | 5779 assert(!is_on_master_free_list(cur), "sanity"); |
| 342 | 5780 if (non_young) { |
| 5781 if (cur->is_young()) { | |
| 5782 double end_sec = os::elapsedTime(); | |
| 5783 double elapsed_ms = (end_sec - start_sec) * 1000.0; | |
| 5784 non_young_time_ms += elapsed_ms; | |
| 5785 | |
| 5786 start_sec = os::elapsedTime(); | |
| 5787 non_young = false; | |
| 5788 } | |
| 5789 } else { | |
|
4097
dc467e8b2c5e
7112743: G1: Reduce overhead of marking closure during evacuation pauses
johnc
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4095
diff
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|
5790 if (!cur->is_young()) { |
|
dc467e8b2c5e
7112743: G1: Reduce overhead of marking closure during evacuation pauses
johnc
parents:
4095
diff
changeset
|
5791 double end_sec = os::elapsedTime(); |
|
dc467e8b2c5e
7112743: G1: Reduce overhead of marking closure during evacuation pauses
johnc
parents:
4095
diff
changeset
|
5792 double elapsed_ms = (end_sec - start_sec) * 1000.0; |
|
dc467e8b2c5e
7112743: G1: Reduce overhead of marking closure during evacuation pauses
johnc
parents:
4095
diff
changeset
|
5793 young_time_ms += elapsed_ms; |
|
dc467e8b2c5e
7112743: G1: Reduce overhead of marking closure during evacuation pauses
johnc
parents:
4095
diff
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|
5794 |
|
dc467e8b2c5e
7112743: G1: Reduce overhead of marking closure during evacuation pauses
johnc
parents:
4095
diff
changeset
|
5795 start_sec = os::elapsedTime(); |
|
dc467e8b2c5e
7112743: G1: Reduce overhead of marking closure during evacuation pauses
johnc
parents:
4095
diff
changeset
|
5796 non_young = true; |
|
dc467e8b2c5e
7112743: G1: Reduce overhead of marking closure during evacuation pauses
johnc
parents:
4095
diff
changeset
|
5797 } |
| 342 | 5798 } |
| 5799 | |
| 5800 rs_lengths += cur->rem_set()->occupied(); | |
| 5801 | |
| 5802 HeapRegion* next = cur->next_in_collection_set(); | |
| 5803 assert(cur->in_collection_set(), "bad CS"); | |
| 5804 cur->set_next_in_collection_set(NULL); | |
| 5805 cur->set_in_collection_set(false); | |
| 5806 | |
| 5807 if (cur->is_young()) { | |
| 5808 int index = cur->young_index_in_cset(); | |
|
4090
a88de71c4e3a
7097002: G1: remove a lot of unused / redundant code from the G1CollectorPolicy class
tonyp
parents:
4073
diff
changeset
|
5809 assert(index != -1, "invariant"); |
|
6010
720b6a76dd9d
7157073: G1: type change size_t -> uint for region counts / indexes
tonyp
parents:
6008
diff
changeset
|
5810 assert((uint) index < policy->young_cset_region_length(), "invariant"); |
| 342 | 5811 size_t words_survived = _surviving_young_words[index]; |
| 5812 cur->record_surv_words_in_group(words_survived); | |
|
1394
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
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1391
diff
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|
5813 |
|
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
5814 // At this point the we have 'popped' cur from the collection set |
|
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
5815 // (linked via next_in_collection_set()) but it is still in the |
|
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
5816 // young list (linked via next_young_region()). Clear the |
|
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
5817 // _next_young_region field. |
|
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
5818 cur->set_next_young_region(NULL); |
| 342 | 5819 } else { |
| 5820 int index = cur->young_index_in_cset(); | |
|
4090
a88de71c4e3a
7097002: G1: remove a lot of unused / redundant code from the G1CollectorPolicy class
tonyp
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4073
diff
changeset
|
5821 assert(index == -1, "invariant"); |
| 342 | 5822 } |
| 5823 | |
| 5824 assert( (cur->is_young() && cur->young_index_in_cset() > -1) || | |
| 5825 (!cur->is_young() && cur->young_index_in_cset() == -1), | |
| 5826 "invariant" ); | |
| 5827 | |
| 5828 if (!cur->evacuation_failed()) { | |
|
4097
dc467e8b2c5e
7112743: G1: Reduce overhead of marking closure during evacuation pauses
johnc
parents:
4095
diff
changeset
|
5829 MemRegion used_mr = cur->used_region(); |
|
dc467e8b2c5e
7112743: G1: Reduce overhead of marking closure during evacuation pauses
johnc
parents:
4095
diff
changeset
|
5830 |
| 342 | 5831 // And the region is empty. |
|
4097
dc467e8b2c5e
7112743: G1: Reduce overhead of marking closure during evacuation pauses
johnc
parents:
4095
diff
changeset
|
5832 assert(!used_mr.is_empty(), "Should not have empty regions in a CS."); |
| 2152 | 5833 free_region(cur, &pre_used, &local_free_list, false /* par */); |
| 342 | 5834 } else { |
| 5835 cur->uninstall_surv_rate_group(); | |
|
4090
a88de71c4e3a
7097002: G1: remove a lot of unused / redundant code from the G1CollectorPolicy class
tonyp
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4073
diff
changeset
|
5836 if (cur->is_young()) { |
| 342 | 5837 cur->set_young_index_in_cset(-1); |
|
4090
a88de71c4e3a
7097002: G1: remove a lot of unused / redundant code from the G1CollectorPolicy class
tonyp
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4073
diff
changeset
|
5838 } |
| 342 | 5839 cur->set_not_young(); |
| 5840 cur->set_evacuation_failed(false); | |
| 4072 | 5841 // The region is now considered to be old. |
| 5842 _old_set.add(cur); | |
| 342 | 5843 } |
| 5844 cur = next; | |
| 5845 } | |
| 5846 | |
| 5847 policy->record_max_rs_lengths(rs_lengths); | |
| 5848 policy->cset_regions_freed(); | |
| 5849 | |
| 5850 double end_sec = os::elapsedTime(); | |
| 5851 double elapsed_ms = (end_sec - start_sec) * 1000.0; | |
|
4097
dc467e8b2c5e
7112743: G1: Reduce overhead of marking closure during evacuation pauses
johnc
parents:
4095
diff
changeset
|
5852 |
|
dc467e8b2c5e
7112743: G1: Reduce overhead of marking closure during evacuation pauses
johnc
parents:
4095
diff
changeset
|
5853 if (non_young) { |
| 342 | 5854 non_young_time_ms += elapsed_ms; |
|
4097
dc467e8b2c5e
7112743: G1: Reduce overhead of marking closure during evacuation pauses
johnc
parents:
4095
diff
changeset
|
5855 } else { |
| 342 | 5856 young_time_ms += elapsed_ms; |
|
4097
dc467e8b2c5e
7112743: G1: Reduce overhead of marking closure during evacuation pauses
johnc
parents:
4095
diff
changeset
|
5857 } |
| 342 | 5858 |
| 2152 | 5859 update_sets_after_freeing_regions(pre_used, &local_free_list, |
| 4072 | 5860 NULL /* old_proxy_set */, |
| 2152 | 5861 NULL /* humongous_proxy_set */, |
| 5862 false /* par */); | |
| 342 | 5863 policy->record_young_free_cset_time_ms(young_time_ms); |
| 5864 policy->record_non_young_free_cset_time_ms(non_young_time_ms); | |
| 5865 } | |
| 5866 | |
|
1394
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
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1391
diff
changeset
|
5867 // This routine is similar to the above but does not record |
|
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
5868 // any policy statistics or update free lists; we are abandoning |
|
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
5869 // the current incremental collection set in preparation of a |
|
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
5870 // full collection. After the full GC we will start to build up |
|
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
5871 // the incremental collection set again. |
|
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
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1391
diff
changeset
|
5872 // This is only called when we're doing a full collection |
|
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
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1391
diff
changeset
|
5873 // and is immediately followed by the tearing down of the young list. |
|
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
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parents:
1391
diff
changeset
|
5874 |
|
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
5875 void G1CollectedHeap::abandon_collection_set(HeapRegion* cs_head) { |
|
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
5876 HeapRegion* cur = cs_head; |
|
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
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parents:
1391
diff
changeset
|
5877 |
|
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
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1391
diff
changeset
|
5878 while (cur != NULL) { |
|
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
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parents:
1391
diff
changeset
|
5879 HeapRegion* next = cur->next_in_collection_set(); |
|
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
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1391
diff
changeset
|
5880 assert(cur->in_collection_set(), "bad CS"); |
|
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
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parents:
1391
diff
changeset
|
5881 cur->set_next_in_collection_set(NULL); |
|
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
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parents:
1391
diff
changeset
|
5882 cur->set_in_collection_set(false); |
|
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
5883 cur->set_young_index_in_cset(-1); |
|
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
5884 cur = next; |
|
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
5885 } |
|
1316cec51b4d
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1391
diff
changeset
|
5886 } |
|
1316cec51b4d
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1391
diff
changeset
|
5887 |
| 2152 | 5888 void G1CollectedHeap::set_free_regions_coming() { |
| 5889 if (G1ConcRegionFreeingVerbose) { | |
| 5890 gclog_or_tty->print_cr("G1ConcRegionFreeing [cm thread] : " | |
| 5891 "setting free regions coming"); | |
| 5892 } | |
| 5893 | |
| 5894 assert(!free_regions_coming(), "pre-condition"); | |
| 5895 _free_regions_coming = true; | |
| 342 | 5896 } |
| 5897 | |
| 2152 | 5898 void G1CollectedHeap::reset_free_regions_coming() { |
|
4837
eff609af17d7
7127706: G1: re-enable survivors during the initial-mark pause
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4836
diff
changeset
|
5899 assert(free_regions_coming(), "pre-condition"); |
|
eff609af17d7
7127706: G1: re-enable survivors during the initial-mark pause
tonyp
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|
5900 |
| 2152 | 5901 { |
| 5902 MutexLockerEx x(SecondaryFreeList_lock, Mutex::_no_safepoint_check_flag); | |
| 5903 _free_regions_coming = false; | |
| 5904 SecondaryFreeList_lock->notify_all(); | |
| 5905 } | |
| 5906 | |
| 5907 if (G1ConcRegionFreeingVerbose) { | |
| 5908 gclog_or_tty->print_cr("G1ConcRegionFreeing [cm thread] : " | |
| 5909 "reset free regions coming"); | |
| 342 | 5910 } |
| 5911 } | |
| 5912 | |
| 2152 | 5913 void G1CollectedHeap::wait_while_free_regions_coming() { |
| 5914 // Most of the time we won't have to wait, so let's do a quick test | |
| 5915 // first before we take the lock. | |
| 5916 if (!free_regions_coming()) { | |
| 5917 return; | |
| 5918 } | |
| 5919 | |
| 5920 if (G1ConcRegionFreeingVerbose) { | |
| 5921 gclog_or_tty->print_cr("G1ConcRegionFreeing [other] : " | |
| 5922 "waiting for free regions"); | |
| 342 | 5923 } |
| 5924 | |
| 5925 { | |
| 2152 | 5926 MutexLockerEx x(SecondaryFreeList_lock, Mutex::_no_safepoint_check_flag); |
| 5927 while (free_regions_coming()) { | |
| 5928 SecondaryFreeList_lock->wait(Mutex::_no_safepoint_check_flag); | |
| 342 | 5929 } |
| 2152 | 5930 } |
| 5931 | |
| 5932 if (G1ConcRegionFreeingVerbose) { | |
| 5933 gclog_or_tty->print_cr("G1ConcRegionFreeing [other] : " | |
| 5934 "done waiting for free regions"); | |
| 5935 } | |
| 342 | 5936 } |
| 5937 | |
| 5938 void G1CollectedHeap::set_region_short_lived_locked(HeapRegion* hr) { | |
| 5939 assert(heap_lock_held_for_gc(), | |
| 5940 "the heap lock should already be held by or for this thread"); | |
| 5941 _young_list->push_region(hr); | |
| 5942 } | |
| 5943 | |
| 5944 class NoYoungRegionsClosure: public HeapRegionClosure { | |
| 5945 private: | |
| 5946 bool _success; | |
| 5947 public: | |
| 5948 NoYoungRegionsClosure() : _success(true) { } | |
| 5949 bool doHeapRegion(HeapRegion* r) { | |
| 5950 if (r->is_young()) { | |
| 5951 gclog_or_tty->print_cr("Region ["PTR_FORMAT", "PTR_FORMAT") tagged as young", | |
| 5952 r->bottom(), r->end()); | |
| 5953 _success = false; | |
| 5954 } | |
| 5955 return false; | |
| 5956 } | |
| 5957 bool success() { return _success; } | |
| 5958 }; | |
| 5959 | |
|
1394
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
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diff
changeset
|
5960 bool G1CollectedHeap::check_young_list_empty(bool check_heap, bool check_sample) { |
|
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
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diff
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|
5961 bool ret = _young_list->check_list_empty(check_sample); |
|
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
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|
5962 |
|
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|
5963 if (check_heap) { |
| 342 | 5964 NoYoungRegionsClosure closure; |
| 5965 heap_region_iterate(&closure); | |
| 5966 ret = ret && closure.success(); | |
| 5967 } | |
| 5968 | |
| 5969 return ret; | |
| 5970 } | |
| 5971 | |
| 4072 | 5972 class TearDownRegionSetsClosure : public HeapRegionClosure { |
| 5973 private: | |
| 5974 OldRegionSet *_old_set; | |
| 2152 | 5975 |
| 342 | 5976 public: |
| 4072 | 5977 TearDownRegionSetsClosure(OldRegionSet* old_set) : _old_set(old_set) { } |
| 2152 | 5978 |
| 342 | 5979 bool doHeapRegion(HeapRegion* r) { |
| 4072 | 5980 if (r->is_empty()) { |
| 5981 // We ignore empty regions, we'll empty the free list afterwards | |
| 5982 } else if (r->is_young()) { | |
| 5983 // We ignore young regions, we'll empty the young list afterwards | |
| 5984 } else if (r->isHumongous()) { | |
| 5985 // We ignore humongous regions, we're not tearing down the | |
| 5986 // humongous region set | |
| 342 | 5987 } else { |
| 4072 | 5988 // The rest should be old |
| 5989 _old_set->remove(r); | |
| 342 | 5990 } |
| 5991 return false; | |
| 5992 } | |
| 5993 | |
| 4072 | 5994 ~TearDownRegionSetsClosure() { |
| 5995 assert(_old_set->is_empty(), "post-condition"); | |
| 2152 | 5996 } |
| 342 | 5997 }; |
| 5998 | |
| 4072 | 5999 void G1CollectedHeap::tear_down_region_sets(bool free_list_only) { |
| 6000 assert_at_safepoint(true /* should_be_vm_thread */); | |
| 6001 | |
| 6002 if (!free_list_only) { | |
| 6003 TearDownRegionSetsClosure cl(&_old_set); | |
| 6004 heap_region_iterate(&cl); | |
| 6005 | |
| 6006 // Need to do this after the heap iteration to be able to | |
| 6007 // recognize the young regions and ignore them during the iteration. | |
| 6008 _young_list->empty_list(); | |
| 6009 } | |
| 6010 _free_list.remove_all(); | |
| 6011 } | |
| 6012 | |
| 6013 class RebuildRegionSetsClosure : public HeapRegionClosure { | |
| 6014 private: | |
| 6015 bool _free_list_only; | |
| 6016 OldRegionSet* _old_set; | |
| 6017 FreeRegionList* _free_list; | |
| 6018 size_t _total_used; | |
| 6019 | |
| 6020 public: | |
| 6021 RebuildRegionSetsClosure(bool free_list_only, | |
| 6022 OldRegionSet* old_set, FreeRegionList* free_list) : | |
| 6023 _free_list_only(free_list_only), | |
| 6024 _old_set(old_set), _free_list(free_list), _total_used(0) { | |
| 6025 assert(_free_list->is_empty(), "pre-condition"); | |
| 6026 if (!free_list_only) { | |
| 6027 assert(_old_set->is_empty(), "pre-condition"); | |
| 6028 } | |
| 6029 } | |
| 6030 | |
| 6031 bool doHeapRegion(HeapRegion* r) { | |
| 6032 if (r->continuesHumongous()) { | |
| 6033 return false; | |
| 6034 } | |
| 6035 | |
| 6036 if (r->is_empty()) { | |
| 6037 // Add free regions to the free list | |
| 6038 _free_list->add_as_tail(r); | |
| 6039 } else if (!_free_list_only) { | |
| 6040 assert(!r->is_young(), "we should not come across young regions"); | |
| 6041 | |
| 6042 if (r->isHumongous()) { | |
| 6043 // We ignore humongous regions, we left the humongous set unchanged | |
| 6044 } else { | |
| 6045 // The rest should be old, add them to the old set | |
| 6046 _old_set->add(r); | |
| 6047 } | |
| 6048 _total_used += r->used(); | |
| 6049 } | |
| 6050 | |
| 6051 return false; | |
| 6052 } | |
| 6053 | |
| 6054 size_t total_used() { | |
| 6055 return _total_used; | |
| 6056 } | |
| 6057 }; | |
| 6058 | |
| 6059 void G1CollectedHeap::rebuild_region_sets(bool free_list_only) { | |
| 6060 assert_at_safepoint(true /* should_be_vm_thread */); | |
| 6061 | |
| 6062 RebuildRegionSetsClosure cl(free_list_only, &_old_set, &_free_list); | |
| 6063 heap_region_iterate(&cl); | |
| 6064 | |
| 6065 if (!free_list_only) { | |
| 6066 _summary_bytes_used = cl.total_used(); | |
| 6067 } | |
| 6068 assert(_summary_bytes_used == recalculate_used(), | |
| 6069 err_msg("inconsistent _summary_bytes_used, " | |
| 6070 "value: "SIZE_FORMAT" recalculated: "SIZE_FORMAT, | |
| 6071 _summary_bytes_used, recalculate_used())); | |
| 342 | 6072 } |
| 6073 | |
| 6074 void G1CollectedHeap::set_refine_cte_cl_concurrency(bool concurrent) { | |
| 6075 _refine_cte_cl->set_concurrent(concurrent); | |
| 6076 } | |
| 6077 | |
| 6078 bool G1CollectedHeap::is_in_closed_subset(const void* p) const { | |
| 6079 HeapRegion* hr = heap_region_containing(p); | |
| 6080 if (hr == NULL) { | |
| 6081 return is_in_permanent(p); | |
| 6082 } else { | |
| 6083 return hr->is_in(p); | |
| 6084 } | |
| 6085 } | |
| 2152 | 6086 |
|
3830
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7039627: G1: avoid BOT updates for survivor allocations and dirty survivor regions incrementally
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diff
changeset
|
6087 // Methods for the mutator alloc region |
|
f44782f04dd4
7039627: G1: avoid BOT updates for survivor allocations and dirty survivor regions incrementally
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diff
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|
6088 |
|
2433
abdfc822206f
7023069: G1: Introduce symmetric locking in the slow allocation path
tonyp
parents:
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diff
changeset
|
6089 HeapRegion* G1CollectedHeap::new_mutator_alloc_region(size_t word_size, |
|
abdfc822206f
7023069: G1: Introduce symmetric locking in the slow allocation path
tonyp
parents:
2432
diff
changeset
|
6090 bool force) { |
|
abdfc822206f
7023069: G1: Introduce symmetric locking in the slow allocation path
tonyp
parents:
2432
diff
changeset
|
6091 assert_heap_locked_or_at_safepoint(true /* should_be_vm_thread */); |
|
abdfc822206f
7023069: G1: Introduce symmetric locking in the slow allocation path
tonyp
parents:
2432
diff
changeset
|
6092 assert(!force || g1_policy()->can_expand_young_list(), |
|
abdfc822206f
7023069: G1: Introduce symmetric locking in the slow allocation path
tonyp
parents:
2432
diff
changeset
|
6093 "if force is true we should be able to expand the young list"); |
|
3778
5f6f2615433a
7049999: G1: Make the G1PrintHeapRegions output consistent and complete
tonyp
parents:
3777
diff
changeset
|
6094 bool young_list_full = g1_policy()->is_young_list_full(); |
|
5f6f2615433a
7049999: G1: Make the G1PrintHeapRegions output consistent and complete
tonyp
parents:
3777
diff
changeset
|
6095 if (force || !young_list_full) { |
|
2433
abdfc822206f
7023069: G1: Introduce symmetric locking in the slow allocation path
tonyp
parents:
2432
diff
changeset
|
6096 HeapRegion* new_alloc_region = new_region(word_size, |
|
abdfc822206f
7023069: G1: Introduce symmetric locking in the slow allocation path
tonyp
parents:
2432
diff
changeset
|
6097 false /* do_expand */); |
|
abdfc822206f
7023069: G1: Introduce symmetric locking in the slow allocation path
tonyp
parents:
2432
diff
changeset
|
6098 if (new_alloc_region != NULL) { |
|
abdfc822206f
7023069: G1: Introduce symmetric locking in the slow allocation path
tonyp
parents:
2432
diff
changeset
|
6099 set_region_short_lived_locked(new_alloc_region); |
|
3778
5f6f2615433a
7049999: G1: Make the G1PrintHeapRegions output consistent and complete
tonyp
parents:
3777
diff
changeset
|
6100 _hr_printer.alloc(new_alloc_region, G1HRPrinter::Eden, young_list_full); |
|
2433
abdfc822206f
7023069: G1: Introduce symmetric locking in the slow allocation path
tonyp
parents:
2432
diff
changeset
|
6101 return new_alloc_region; |
|
abdfc822206f
7023069: G1: Introduce symmetric locking in the slow allocation path
tonyp
parents:
2432
diff
changeset
|
6102 } |
|
abdfc822206f
7023069: G1: Introduce symmetric locking in the slow allocation path
tonyp
parents:
2432
diff
changeset
|
6103 } |
|
abdfc822206f
7023069: G1: Introduce symmetric locking in the slow allocation path
tonyp
parents:
2432
diff
changeset
|
6104 return NULL; |
|
abdfc822206f
7023069: G1: Introduce symmetric locking in the slow allocation path
tonyp
parents:
2432
diff
changeset
|
6105 } |
|
abdfc822206f
7023069: G1: Introduce symmetric locking in the slow allocation path
tonyp
parents:
2432
diff
changeset
|
6106 |
|
abdfc822206f
7023069: G1: Introduce symmetric locking in the slow allocation path
tonyp
parents:
2432
diff
changeset
|
6107 void G1CollectedHeap::retire_mutator_alloc_region(HeapRegion* alloc_region, |
|
abdfc822206f
7023069: G1: Introduce symmetric locking in the slow allocation path
tonyp
parents:
2432
diff
changeset
|
6108 size_t allocated_bytes) { |
|
abdfc822206f
7023069: G1: Introduce symmetric locking in the slow allocation path
tonyp
parents:
2432
diff
changeset
|
6109 assert_heap_locked_or_at_safepoint(true /* should_be_vm_thread */); |
|
abdfc822206f
7023069: G1: Introduce symmetric locking in the slow allocation path
tonyp
parents:
2432
diff
changeset
|
6110 assert(alloc_region->is_young(), "all mutator alloc regions should be young"); |
|
abdfc822206f
7023069: G1: Introduce symmetric locking in the slow allocation path
tonyp
parents:
2432
diff
changeset
|
6111 |
|
abdfc822206f
7023069: G1: Introduce symmetric locking in the slow allocation path
tonyp
parents:
2432
diff
changeset
|
6112 g1_policy()->add_region_to_incremental_cset_lhs(alloc_region); |
|
abdfc822206f
7023069: G1: Introduce symmetric locking in the slow allocation path
tonyp
parents:
2432
diff
changeset
|
6113 _summary_bytes_used += allocated_bytes; |
|
3778
5f6f2615433a
7049999: G1: Make the G1PrintHeapRegions output consistent and complete
tonyp
parents:
3777
diff
changeset
|
6114 _hr_printer.retire(alloc_region); |
|
3980
8229bd737950
7075646: G1: fix inconsistencies in the monitoring data
tonyp
parents:
3979
diff
changeset
|
6115 // 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
|
6116 // 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
|
6117 // used space has been recored in _summary_bytes_used. |
|
8229bd737950
7075646: G1: fix inconsistencies in the monitoring data
tonyp
parents:
3979
diff
changeset
|
6118 g1mm()->update_eden_size(); |
|
2433
abdfc822206f
7023069: G1: Introduce symmetric locking in the slow allocation path
tonyp
parents:
2432
diff
changeset
|
6119 } |
|
abdfc822206f
7023069: G1: Introduce symmetric locking in the slow allocation path
tonyp
parents:
2432
diff
changeset
|
6120 |
|
abdfc822206f
7023069: G1: Introduce symmetric locking in the slow allocation path
tonyp
parents:
2432
diff
changeset
|
6121 HeapRegion* MutatorAllocRegion::allocate_new_region(size_t word_size, |
|
abdfc822206f
7023069: G1: Introduce symmetric locking in the slow allocation path
tonyp
parents:
2432
diff
changeset
|
6122 bool force) { |
|
abdfc822206f
7023069: G1: Introduce symmetric locking in the slow allocation path
tonyp
parents:
2432
diff
changeset
|
6123 return _g1h->new_mutator_alloc_region(word_size, force); |
|
abdfc822206f
7023069: G1: Introduce symmetric locking in the slow allocation path
tonyp
parents:
2432
diff
changeset
|
6124 } |
|
abdfc822206f
7023069: G1: Introduce symmetric locking in the slow allocation path
tonyp
parents:
2432
diff
changeset
|
6125 |
|
4095
bca17e38de00
6593758: RFE: Enhance GC ergonomics to dynamically choose ParallelGCThreads
jmasa
parents:
4090
diff
changeset
|
6126 void G1CollectedHeap::set_par_threads() { |
|
bca17e38de00
6593758: RFE: Enhance GC ergonomics to dynamically choose ParallelGCThreads
jmasa
parents:
4090
diff
changeset
|
6127 // 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
|
6128 // in the workgroup. |
| 4711 | 6129 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
|
6130 uint n_workers = workers()->active_workers(); |
| 4711 | 6131 assert(UseDynamicNumberOfGCThreads || |
|
4095
bca17e38de00
6593758: RFE: Enhance GC ergonomics to dynamically choose ParallelGCThreads
jmasa
parents:
4090
diff
changeset
|
6132 n_workers == workers()->total_workers(), |
|
bca17e38de00
6593758: RFE: Enhance GC ergonomics to dynamically choose ParallelGCThreads
jmasa
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4090
diff
changeset
|
6133 "Otherwise should be using the total number of workers"); |
|
bca17e38de00
6593758: RFE: Enhance GC ergonomics to dynamically choose ParallelGCThreads
jmasa
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4090
diff
changeset
|
6134 if (n_workers == 0) { |
|
bca17e38de00
6593758: RFE: Enhance GC ergonomics to dynamically choose ParallelGCThreads
jmasa
parents:
4090
diff
changeset
|
6135 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
|
6136 n_workers = ParallelGCThreads; |
|
bca17e38de00
6593758: RFE: Enhance GC ergonomics to dynamically choose ParallelGCThreads
jmasa
parents:
4090
diff
changeset
|
6137 workers()->set_active_workers(n_workers); |
|
bca17e38de00
6593758: RFE: Enhance GC ergonomics to dynamically choose ParallelGCThreads
jmasa
parents:
4090
diff
changeset
|
6138 } |
|
bca17e38de00
6593758: RFE: Enhance GC ergonomics to dynamically choose ParallelGCThreads
jmasa
parents:
4090
diff
changeset
|
6139 set_par_threads(n_workers); |
|
bca17e38de00
6593758: RFE: Enhance GC ergonomics to dynamically choose ParallelGCThreads
jmasa
parents:
4090
diff
changeset
|
6140 } |
|
bca17e38de00
6593758: RFE: Enhance GC ergonomics to dynamically choose ParallelGCThreads
jmasa
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4090
diff
changeset
|
6141 |
|
2433
abdfc822206f
7023069: G1: Introduce symmetric locking in the slow allocation path
tonyp
parents:
2432
diff
changeset
|
6142 void MutatorAllocRegion::retire_region(HeapRegion* alloc_region, |
|
abdfc822206f
7023069: G1: Introduce symmetric locking in the slow allocation path
tonyp
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2432
diff
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|
6143 size_t allocated_bytes) { |
|
abdfc822206f
7023069: G1: Introduce symmetric locking in the slow allocation path
tonyp
parents:
2432
diff
changeset
|
6144 _g1h->retire_mutator_alloc_region(alloc_region, allocated_bytes); |
|
abdfc822206f
7023069: G1: Introduce symmetric locking in the slow allocation path
tonyp
parents:
2432
diff
changeset
|
6145 } |
|
abdfc822206f
7023069: G1: Introduce symmetric locking in the slow allocation path
tonyp
parents:
2432
diff
changeset
|
6146 |
|
3830
f44782f04dd4
7039627: G1: avoid BOT updates for survivor allocations and dirty survivor regions incrementally
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3824
diff
changeset
|
6147 // 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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3824
diff
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|
6148 |
|
f44782f04dd4
7039627: G1: avoid BOT updates for survivor allocations and dirty survivor regions incrementally
tonyp
parents:
3824
diff
changeset
|
6149 HeapRegion* G1CollectedHeap::new_gc_alloc_region(size_t word_size, |
|
6010
720b6a76dd9d
7157073: G1: type change size_t -> uint for region counts / indexes
tonyp
parents:
6008
diff
changeset
|
6150 uint count, |
|
3830
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7039627: G1: avoid BOT updates for survivor allocations and dirty survivor regions incrementally
tonyp
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3824
diff
changeset
|
6151 GCAllocPurpose ap) { |
|
f44782f04dd4
7039627: G1: avoid BOT updates for survivor allocations and dirty survivor regions incrementally
tonyp
parents:
3824
diff
changeset
|
6152 assert(FreeList_lock->owned_by_self(), "pre-condition"); |
|
f44782f04dd4
7039627: G1: avoid BOT updates for survivor allocations and dirty survivor regions incrementally
tonyp
parents:
3824
diff
changeset
|
6153 |
|
f44782f04dd4
7039627: G1: avoid BOT updates for survivor allocations and dirty survivor regions incrementally
tonyp
parents:
3824
diff
changeset
|
6154 if (count < g1_policy()->max_regions(ap)) { |
|
f44782f04dd4
7039627: G1: avoid BOT updates for survivor allocations and dirty survivor regions incrementally
tonyp
parents:
3824
diff
changeset
|
6155 HeapRegion* new_alloc_region = new_region(word_size, |
|
f44782f04dd4
7039627: G1: avoid BOT updates for survivor allocations and dirty survivor regions incrementally
tonyp
parents:
3824
diff
changeset
|
6156 true /* do_expand */); |
|
f44782f04dd4
7039627: G1: avoid BOT updates for survivor allocations and dirty survivor regions incrementally
tonyp
parents:
3824
diff
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|
6157 if (new_alloc_region != NULL) { |
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6158 // We really only need to do this for old regions given that we |
|
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6159 // should never scan survivors. But it doesn't hurt to do it |
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6160 // for survivors too. |
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6161 new_alloc_region->set_saved_mark(); |
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6162 if (ap == GCAllocForSurvived) { |
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6163 new_alloc_region->set_survivor(); |
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6164 _hr_printer.alloc(new_alloc_region, G1HRPrinter::Survivor); |
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6165 } else { |
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6166 _hr_printer.alloc(new_alloc_region, G1HRPrinter::Old); |
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6167 } |
|
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6168 bool during_im = g1_policy()->during_initial_mark_pause(); |
|
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6169 new_alloc_region->note_start_of_copying(during_im); |
|
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6170 return new_alloc_region; |
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6171 } else { |
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6172 g1_policy()->note_alloc_region_limit_reached(ap); |
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6173 } |
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6174 } |
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6175 return NULL; |
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6176 } |
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6177 |
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6178 void G1CollectedHeap::retire_gc_alloc_region(HeapRegion* alloc_region, |
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6179 size_t allocated_bytes, |
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6180 GCAllocPurpose ap) { |
|
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6181 bool during_im = g1_policy()->during_initial_mark_pause(); |
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6182 alloc_region->note_end_of_copying(during_im); |
|
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6183 g1_policy()->record_bytes_copied_during_gc(allocated_bytes); |
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6184 if (ap == GCAllocForSurvived) { |
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6185 young_list()->add_survivor_region(alloc_region); |
| 4072 | 6186 } else { |
| 6187 _old_set.add(alloc_region); | |
|
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6188 } |
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6189 _hr_printer.retire(alloc_region); |
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6190 } |
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6191 |
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6192 HeapRegion* SurvivorGCAllocRegion::allocate_new_region(size_t word_size, |
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6193 bool force) { |
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6194 assert(!force, "not supported for GC alloc regions"); |
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6195 return _g1h->new_gc_alloc_region(word_size, count(), GCAllocForSurvived); |
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6196 } |
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6197 |
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6198 void SurvivorGCAllocRegion::retire_region(HeapRegion* alloc_region, |
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6199 size_t allocated_bytes) { |
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6200 _g1h->retire_gc_alloc_region(alloc_region, allocated_bytes, |
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6201 GCAllocForSurvived); |
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6202 } |
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6203 |
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6204 HeapRegion* OldGCAllocRegion::allocate_new_region(size_t word_size, |
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6205 bool force) { |
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6206 assert(!force, "not supported for GC alloc regions"); |
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6207 return _g1h->new_gc_alloc_region(word_size, count(), GCAllocForTenured); |
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6208 } |
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6209 |
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6210 void OldGCAllocRegion::retire_region(HeapRegion* alloc_region, |
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6211 size_t allocated_bytes) { |
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6212 _g1h->retire_gc_alloc_region(alloc_region, allocated_bytes, |
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6213 GCAllocForTenured); |
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6214 } |
|
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|
6215 // Heap region set verification |
|
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6216 |
| 2152 | 6217 class VerifyRegionListsClosure : public HeapRegionClosure { |
| 6218 private: | |
| 4072 | 6219 FreeRegionList* _free_list; |
| 6220 OldRegionSet* _old_set; | |
| 2152 | 6221 HumongousRegionSet* _humongous_set; |
|
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|
6222 uint _region_count; |
| 2152 | 6223 |
| 6224 public: | |
| 4072 | 6225 VerifyRegionListsClosure(OldRegionSet* old_set, |
| 6226 HumongousRegionSet* humongous_set, | |
| 2152 | 6227 FreeRegionList* free_list) : |
| 4072 | 6228 _old_set(old_set), _humongous_set(humongous_set), |
| 6229 _free_list(free_list), _region_count(0) { } | |
| 2152 | 6230 |
|
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|
6231 uint region_count() { return _region_count; } |
| 2152 | 6232 |
| 6233 bool doHeapRegion(HeapRegion* hr) { | |
| 6234 _region_count += 1; | |
| 6235 | |
| 6236 if (hr->continuesHumongous()) { | |
| 6237 return false; | |
| 6238 } | |
| 6239 | |
| 6240 if (hr->is_young()) { | |
| 6241 // TODO | |
| 6242 } else if (hr->startsHumongous()) { | |
| 6243 _humongous_set->verify_next_region(hr); | |
| 6244 } else if (hr->is_empty()) { | |
| 6245 _free_list->verify_next_region(hr); | |
| 4072 | 6246 } else { |
| 6247 _old_set->verify_next_region(hr); | |
| 2152 | 6248 } |
| 6249 return false; | |
| 6250 } | |
| 6251 }; | |
| 6252 | |
|
6010
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|
6253 HeapRegion* G1CollectedHeap::new_heap_region(uint hrs_index, |
| 3766 | 6254 HeapWord* bottom) { |
| 6255 HeapWord* end = bottom + HeapRegion::GrainWords; | |
| 6256 MemRegion mr(bottom, end); | |
| 6257 assert(_g1_reserved.contains(mr), "invariant"); | |
| 6258 // This might return NULL if the allocation fails | |
| 6259 return new HeapRegion(hrs_index, _bot_shared, mr, true /* is_zeroed */); | |
| 6260 } | |
| 6261 | |
| 2152 | 6262 void G1CollectedHeap::verify_region_sets() { |
| 6263 assert_heap_locked_or_at_safepoint(true /* should_be_vm_thread */); | |
| 6264 | |
| 6265 // First, check the explicit lists. | |
| 6266 _free_list.verify(); | |
| 6267 { | |
| 6268 // Given that a concurrent operation might be adding regions to | |
| 6269 // the secondary free list we have to take the lock before | |
| 6270 // verifying it. | |
| 6271 MutexLockerEx x(SecondaryFreeList_lock, Mutex::_no_safepoint_check_flag); | |
| 6272 _secondary_free_list.verify(); | |
| 6273 } | |
| 4072 | 6274 _old_set.verify(); |
| 2152 | 6275 _humongous_set.verify(); |
| 6276 | |
| 6277 // If a concurrent region freeing operation is in progress it will | |
| 6278 // be difficult to correctly attributed any free regions we come | |
| 6279 // across to the correct free list given that they might belong to | |
| 6280 // one of several (free_list, secondary_free_list, any local lists, | |
| 6281 // etc.). So, if that's the case we will skip the rest of the | |
| 6282 // verification operation. Alternatively, waiting for the concurrent | |
| 6283 // operation to complete will have a non-trivial effect on the GC's | |
| 6284 // operation (no concurrent operation will last longer than the | |
| 6285 // interval between two calls to verification) and it might hide | |
| 6286 // any issues that we would like to catch during testing. | |
| 6287 if (free_regions_coming()) { | |
| 6288 return; | |
| 6289 } | |
| 6290 | |
| 2361 | 6291 // Make sure we append the secondary_free_list on the free_list so |
| 6292 // that all free regions we will come across can be safely | |
| 6293 // attributed to the free_list. | |
| 6294 append_secondary_free_list_if_not_empty_with_lock(); | |
| 2152 | 6295 |
| 6296 // Finally, make sure that the region accounting in the lists is | |
| 6297 // consistent with what we see in the heap. | |
| 4072 | 6298 _old_set.verify_start(); |
| 2152 | 6299 _humongous_set.verify_start(); |
| 6300 _free_list.verify_start(); | |
| 6301 | |
| 4072 | 6302 VerifyRegionListsClosure cl(&_old_set, &_humongous_set, &_free_list); |
| 2152 | 6303 heap_region_iterate(&cl); |
| 6304 | |
| 4072 | 6305 _old_set.verify_end(); |
| 2152 | 6306 _humongous_set.verify_end(); |
| 6307 _free_list.verify_end(); | |
| 342 | 6308 } |