Mercurial > hg > truffle
annotate src/share/vm/gc_implementation/g1/g1CollectedHeap.cpp @ 4872:aa3d708d67c4
7141200: log some interesting information in ring buffers for crashes
Reviewed-by: kvn, jrose, kevinw, brutisso, twisti, jmasa
| author | never |
|---|---|
| date | Wed, 01 Feb 2012 07:59:01 -0800 |
| parents | 2ace1c4ee8da |
| children | 379b22e03c32 |
| rev | line source |
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| 342 | 1 /* |
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2 * Copyright (c) 2001, 2012, Oracle and/or its affiliates. All rights reserved. |
| 342 | 3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
| 4 * | |
| 5 * This code is free software; you can redistribute it and/or modify it | |
| 6 * under the terms of the GNU General Public License version 2 only, as | |
| 7 * published by the Free Software Foundation. | |
| 8 * | |
| 9 * This code is distributed in the hope that it will be useful, but WITHOUT | |
| 10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or | |
| 11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License | |
| 12 * version 2 for more details (a copy is included in the LICENSE file that | |
| 13 * accompanied this code). | |
| 14 * | |
| 15 * You should have received a copy of the GNU General Public License version | |
| 16 * 2 along with this work; if not, write to the Free Software Foundation, | |
| 17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. | |
| 18 * | |
|
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19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
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20 * or visit www.oracle.com if you need additional information or have any |
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21 * questions. |
| 342 | 22 * |
| 23 */ | |
| 24 | |
| 1972 | 25 #include "precompiled.hpp" |
| 26 #include "code/icBuffer.hpp" | |
| 27 #include "gc_implementation/g1/bufferingOopClosure.hpp" | |
| 28 #include "gc_implementation/g1/concurrentG1Refine.hpp" | |
| 29 #include "gc_implementation/g1/concurrentG1RefineThread.hpp" | |
| 30 #include "gc_implementation/g1/concurrentMarkThread.inline.hpp" | |
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31 #include "gc_implementation/g1/g1AllocRegion.inline.hpp" |
| 1972 | 32 #include "gc_implementation/g1/g1CollectedHeap.inline.hpp" |
| 33 #include "gc_implementation/g1/g1CollectorPolicy.hpp" | |
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34 #include "gc_implementation/g1/g1ErgoVerbose.hpp" |
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35 #include "gc_implementation/g1/g1EvacFailure.hpp" |
| 1972 | 36 #include "gc_implementation/g1/g1MarkSweep.hpp" |
| 37 #include "gc_implementation/g1/g1OopClosures.inline.hpp" | |
| 38 #include "gc_implementation/g1/g1RemSet.inline.hpp" | |
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39 #include "gc_implementation/g1/heapRegion.inline.hpp" |
| 1972 | 40 #include "gc_implementation/g1/heapRegionRemSet.hpp" |
| 41 #include "gc_implementation/g1/heapRegionSeq.inline.hpp" | |
| 42 #include "gc_implementation/g1/vm_operations_g1.hpp" | |
| 43 #include "gc_implementation/shared/isGCActiveMark.hpp" | |
| 44 #include "memory/gcLocker.inline.hpp" | |
| 45 #include "memory/genOopClosures.inline.hpp" | |
| 46 #include "memory/generationSpec.hpp" | |
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47 #include "memory/referenceProcessor.hpp" |
| 1972 | 48 #include "oops/oop.inline.hpp" |
| 49 #include "oops/oop.pcgc.inline.hpp" | |
| 50 #include "runtime/aprofiler.hpp" | |
| 51 #include "runtime/vmThread.hpp" | |
| 342 | 52 |
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53 size_t G1CollectedHeap::_humongous_object_threshold_in_words = 0; |
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54 |
| 342 | 55 // turn it on so that the contents of the young list (scan-only / |
| 56 // to-be-collected) are printed at "strategic" points before / during | |
| 57 // / after the collection --- this is useful for debugging | |
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58 #define YOUNG_LIST_VERBOSE 0 |
| 342 | 59 // CURRENT STATUS |
| 60 // This file is under construction. Search for "FIXME". | |
| 61 | |
| 62 // INVARIANTS/NOTES | |
| 63 // | |
| 64 // All allocation activity covered by the G1CollectedHeap interface is | |
| 1973 | 65 // serialized by acquiring the HeapLock. This happens in mem_allocate |
| 66 // and allocate_new_tlab, which are the "entry" points to the | |
| 67 // allocation code from the rest of the JVM. (Note that this does not | |
| 68 // apply to TLAB allocation, which is not part of this interface: it | |
| 69 // is done by clients of this interface.) | |
| 342 | 70 |
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71 // Notes on implementation of parallelism in different tasks. |
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72 // |
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73 // G1ParVerifyTask uses heap_region_par_iterate_chunked() for parallelism. |
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74 // The number of GC workers is passed to heap_region_par_iterate_chunked(). |
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75 // It does use run_task() which sets _n_workers in the task. |
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76 // G1ParTask executes g1_process_strong_roots() -> |
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77 // SharedHeap::process_strong_roots() which calls eventuall to |
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78 // CardTableModRefBS::par_non_clean_card_iterate_work() which uses |
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79 // SequentialSubTasksDone. SharedHeap::process_strong_roots() also |
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80 // directly uses SubTasksDone (_process_strong_tasks field in SharedHeap). |
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81 // |
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82 |
| 342 | 83 // Local to this file. |
| 84 | |
| 85 class RefineCardTableEntryClosure: public CardTableEntryClosure { | |
| 86 SuspendibleThreadSet* _sts; | |
| 87 G1RemSet* _g1rs; | |
| 88 ConcurrentG1Refine* _cg1r; | |
| 89 bool _concurrent; | |
| 90 public: | |
| 91 RefineCardTableEntryClosure(SuspendibleThreadSet* sts, | |
| 92 G1RemSet* g1rs, | |
| 93 ConcurrentG1Refine* cg1r) : | |
| 94 _sts(sts), _g1rs(g1rs), _cg1r(cg1r), _concurrent(true) | |
| 95 {} | |
| 96 bool do_card_ptr(jbyte* card_ptr, int worker_i) { | |
| 1705 | 97 bool oops_into_cset = _g1rs->concurrentRefineOneCard(card_ptr, worker_i, false); |
| 98 // This path is executed by the concurrent refine or mutator threads, | |
| 99 // concurrently, and so we do not care if card_ptr contains references | |
| 100 // that point into the collection set. | |
| 101 assert(!oops_into_cset, "should be"); | |
| 102 | |
| 342 | 103 if (_concurrent && _sts->should_yield()) { |
| 104 // Caller will actually yield. | |
| 105 return false; | |
| 106 } | |
| 107 // Otherwise, we finished successfully; return true. | |
| 108 return true; | |
| 109 } | |
| 110 void set_concurrent(bool b) { _concurrent = b; } | |
| 111 }; | |
| 112 | |
| 113 | |
| 114 class ClearLoggedCardTableEntryClosure: public CardTableEntryClosure { | |
| 115 int _calls; | |
| 116 G1CollectedHeap* _g1h; | |
| 117 CardTableModRefBS* _ctbs; | |
| 118 int _histo[256]; | |
| 119 public: | |
| 120 ClearLoggedCardTableEntryClosure() : | |
| 121 _calls(0) | |
| 122 { | |
| 123 _g1h = G1CollectedHeap::heap(); | |
| 124 _ctbs = (CardTableModRefBS*)_g1h->barrier_set(); | |
| 125 for (int i = 0; i < 256; i++) _histo[i] = 0; | |
| 126 } | |
| 127 bool do_card_ptr(jbyte* card_ptr, int worker_i) { | |
| 128 if (_g1h->is_in_reserved(_ctbs->addr_for(card_ptr))) { | |
| 129 _calls++; | |
| 130 unsigned char* ujb = (unsigned char*)card_ptr; | |
| 131 int ind = (int)(*ujb); | |
| 132 _histo[ind]++; | |
| 133 *card_ptr = -1; | |
| 134 } | |
| 135 return true; | |
| 136 } | |
| 137 int calls() { return _calls; } | |
| 138 void print_histo() { | |
| 139 gclog_or_tty->print_cr("Card table value histogram:"); | |
| 140 for (int i = 0; i < 256; i++) { | |
| 141 if (_histo[i] != 0) { | |
| 142 gclog_or_tty->print_cr(" %d: %d", i, _histo[i]); | |
| 143 } | |
| 144 } | |
| 145 } | |
| 146 }; | |
| 147 | |
| 148 class RedirtyLoggedCardTableEntryClosure: public CardTableEntryClosure { | |
| 149 int _calls; | |
| 150 G1CollectedHeap* _g1h; | |
| 151 CardTableModRefBS* _ctbs; | |
| 152 public: | |
| 153 RedirtyLoggedCardTableEntryClosure() : | |
| 154 _calls(0) | |
| 155 { | |
| 156 _g1h = G1CollectedHeap::heap(); | |
| 157 _ctbs = (CardTableModRefBS*)_g1h->barrier_set(); | |
| 158 } | |
| 159 bool do_card_ptr(jbyte* card_ptr, int worker_i) { | |
| 160 if (_g1h->is_in_reserved(_ctbs->addr_for(card_ptr))) { | |
| 161 _calls++; | |
| 162 *card_ptr = 0; | |
| 163 } | |
| 164 return true; | |
| 165 } | |
| 166 int calls() { return _calls; } | |
| 167 }; | |
| 168 | |
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169 class RedirtyLoggedCardTableEntryFastClosure : public CardTableEntryClosure { |
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170 public: |
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171 bool do_card_ptr(jbyte* card_ptr, int worker_i) { |
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172 *card_ptr = CardTableModRefBS::dirty_card_val(); |
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173 return true; |
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174 } |
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175 }; |
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176 |
| 342 | 177 YoungList::YoungList(G1CollectedHeap* g1h) |
| 178 : _g1h(g1h), _head(NULL), | |
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179 _length(0), |
| 342 | 180 _last_sampled_rs_lengths(0), |
| 545 | 181 _survivor_head(NULL), _survivor_tail(NULL), _survivor_length(0) |
| 342 | 182 { |
| 183 guarantee( check_list_empty(false), "just making sure..." ); | |
| 184 } | |
| 185 | |
| 186 void YoungList::push_region(HeapRegion *hr) { | |
| 187 assert(!hr->is_young(), "should not already be young"); | |
| 188 assert(hr->get_next_young_region() == NULL, "cause it should!"); | |
| 189 | |
| 190 hr->set_next_young_region(_head); | |
| 191 _head = hr; | |
| 192 | |
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193 _g1h->g1_policy()->set_region_eden(hr, (int) _length); |
| 342 | 194 ++_length; |
| 195 } | |
| 196 | |
| 197 void YoungList::add_survivor_region(HeapRegion* hr) { | |
| 545 | 198 assert(hr->is_survivor(), "should be flagged as survivor region"); |
| 342 | 199 assert(hr->get_next_young_region() == NULL, "cause it should!"); |
| 200 | |
| 201 hr->set_next_young_region(_survivor_head); | |
| 202 if (_survivor_head == NULL) { | |
| 545 | 203 _survivor_tail = hr; |
| 342 | 204 } |
| 205 _survivor_head = hr; | |
| 206 ++_survivor_length; | |
| 207 } | |
| 208 | |
| 209 void YoungList::empty_list(HeapRegion* list) { | |
| 210 while (list != NULL) { | |
| 211 HeapRegion* next = list->get_next_young_region(); | |
| 212 list->set_next_young_region(NULL); | |
| 213 list->uninstall_surv_rate_group(); | |
| 214 list->set_not_young(); | |
| 215 list = next; | |
| 216 } | |
| 217 } | |
| 218 | |
| 219 void YoungList::empty_list() { | |
| 220 assert(check_list_well_formed(), "young list should be well formed"); | |
| 221 | |
| 222 empty_list(_head); | |
| 223 _head = NULL; | |
| 224 _length = 0; | |
| 225 | |
| 226 empty_list(_survivor_head); | |
| 227 _survivor_head = NULL; | |
| 545 | 228 _survivor_tail = NULL; |
| 342 | 229 _survivor_length = 0; |
| 230 | |
| 231 _last_sampled_rs_lengths = 0; | |
| 232 | |
| 233 assert(check_list_empty(false), "just making sure..."); | |
| 234 } | |
| 235 | |
| 236 bool YoungList::check_list_well_formed() { | |
| 237 bool ret = true; | |
| 238 | |
| 239 size_t length = 0; | |
| 240 HeapRegion* curr = _head; | |
| 241 HeapRegion* last = NULL; | |
| 242 while (curr != NULL) { | |
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243 if (!curr->is_young()) { |
| 342 | 244 gclog_or_tty->print_cr("### YOUNG REGION "PTR_FORMAT"-"PTR_FORMAT" " |
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245 "incorrectly tagged (y: %d, surv: %d)", |
| 342 | 246 curr->bottom(), curr->end(), |
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247 curr->is_young(), curr->is_survivor()); |
| 342 | 248 ret = false; |
| 249 } | |
| 250 ++length; | |
| 251 last = curr; | |
| 252 curr = curr->get_next_young_region(); | |
| 253 } | |
| 254 ret = ret && (length == _length); | |
| 255 | |
| 256 if (!ret) { | |
| 257 gclog_or_tty->print_cr("### YOUNG LIST seems not well formed!"); | |
| 258 gclog_or_tty->print_cr("### list has %d entries, _length is %d", | |
| 259 length, _length); | |
| 260 } | |
| 261 | |
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262 return ret; |
| 342 | 263 } |
| 264 | |
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265 bool YoungList::check_list_empty(bool check_sample) { |
| 342 | 266 bool ret = true; |
| 267 | |
| 268 if (_length != 0) { | |
| 269 gclog_or_tty->print_cr("### YOUNG LIST should have 0 length, not %d", | |
| 270 _length); | |
| 271 ret = false; | |
| 272 } | |
| 273 if (check_sample && _last_sampled_rs_lengths != 0) { | |
| 274 gclog_or_tty->print_cr("### YOUNG LIST has non-zero last sampled RS lengths"); | |
| 275 ret = false; | |
| 276 } | |
| 277 if (_head != NULL) { | |
| 278 gclog_or_tty->print_cr("### YOUNG LIST does not have a NULL head"); | |
| 279 ret = false; | |
| 280 } | |
| 281 if (!ret) { | |
| 282 gclog_or_tty->print_cr("### YOUNG LIST does not seem empty"); | |
| 283 } | |
| 284 | |
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285 return ret; |
| 342 | 286 } |
| 287 | |
| 288 void | |
| 289 YoungList::rs_length_sampling_init() { | |
| 290 _sampled_rs_lengths = 0; | |
| 291 _curr = _head; | |
| 292 } | |
| 293 | |
| 294 bool | |
| 295 YoungList::rs_length_sampling_more() { | |
| 296 return _curr != NULL; | |
| 297 } | |
| 298 | |
| 299 void | |
| 300 YoungList::rs_length_sampling_next() { | |
| 301 assert( _curr != NULL, "invariant" ); | |
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302 size_t rs_length = _curr->rem_set()->occupied(); |
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303 |
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304 _sampled_rs_lengths += rs_length; |
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305 |
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306 // The current region may not yet have been added to the |
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307 // incremental collection set (it gets added when it is |
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308 // retired as the current allocation region). |
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309 if (_curr->in_collection_set()) { |
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310 // Update the collection set policy information for this region |
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311 _g1h->g1_policy()->update_incremental_cset_info(_curr, rs_length); |
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312 } |
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313 |
| 342 | 314 _curr = _curr->get_next_young_region(); |
| 315 if (_curr == NULL) { | |
| 316 _last_sampled_rs_lengths = _sampled_rs_lengths; | |
| 317 // gclog_or_tty->print_cr("last sampled RS lengths = %d", _last_sampled_rs_lengths); | |
| 318 } | |
| 319 } | |
| 320 | |
| 321 void | |
| 322 YoungList::reset_auxilary_lists() { | |
| 323 guarantee( is_empty(), "young list should be empty" ); | |
| 324 assert(check_list_well_formed(), "young list should be well formed"); | |
| 325 | |
| 326 // Add survivor regions to SurvRateGroup. | |
| 327 _g1h->g1_policy()->note_start_adding_survivor_regions(); | |
| 545 | 328 _g1h->g1_policy()->finished_recalculating_age_indexes(true /* is_survivors */); |
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329 |
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330 int young_index_in_cset = 0; |
| 342 | 331 for (HeapRegion* curr = _survivor_head; |
| 332 curr != NULL; | |
| 333 curr = curr->get_next_young_region()) { | |
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334 _g1h->g1_policy()->set_region_survivor(curr, young_index_in_cset); |
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335 |
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336 // The region is a non-empty survivor so let's add it to |
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337 // the incremental collection set for the next evacuation |
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338 // pause. |
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339 _g1h->g1_policy()->add_region_to_incremental_cset_rhs(curr); |
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340 young_index_in_cset += 1; |
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341 } |
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342 assert((size_t) young_index_in_cset == _survivor_length, |
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343 "post-condition"); |
| 342 | 344 _g1h->g1_policy()->note_stop_adding_survivor_regions(); |
| 345 | |
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346 _head = _survivor_head; |
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347 _length = _survivor_length; |
| 342 | 348 if (_survivor_head != NULL) { |
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349 assert(_survivor_tail != NULL, "cause it shouldn't be"); |
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350 assert(_survivor_length > 0, "invariant"); |
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351 _survivor_tail->set_next_young_region(NULL); |
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352 } |
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353 |
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354 // Don't clear the survivor list handles until the start of |
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355 // the next evacuation pause - we need it in order to re-tag |
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356 // the survivor regions from this evacuation pause as 'young' |
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357 // at the start of the next. |
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358 |
| 545 | 359 _g1h->g1_policy()->finished_recalculating_age_indexes(false /* is_survivors */); |
| 342 | 360 |
| 361 assert(check_list_well_formed(), "young list should be well formed"); | |
| 362 } | |
| 363 | |
| 364 void YoungList::print() { | |
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365 HeapRegion* lists[] = {_head, _survivor_head}; |
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366 const char* names[] = {"YOUNG", "SURVIVOR"}; |
| 342 | 367 |
| 368 for (unsigned int list = 0; list < ARRAY_SIZE(lists); ++list) { | |
| 369 gclog_or_tty->print_cr("%s LIST CONTENTS", names[list]); | |
| 370 HeapRegion *curr = lists[list]; | |
| 371 if (curr == NULL) | |
| 372 gclog_or_tty->print_cr(" empty"); | |
| 373 while (curr != NULL) { | |
| 374 gclog_or_tty->print_cr(" [%08x-%08x], t: %08x, P: %08x, N: %08x, C: %08x, " | |
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375 "age: %4d, y: %d, surv: %d", |
| 342 | 376 curr->bottom(), curr->end(), |
| 377 curr->top(), | |
| 378 curr->prev_top_at_mark_start(), | |
| 379 curr->next_top_at_mark_start(), | |
| 380 curr->top_at_conc_mark_count(), | |
| 381 curr->age_in_surv_rate_group_cond(), | |
| 382 curr->is_young(), | |
| 383 curr->is_survivor()); | |
| 384 curr = curr->get_next_young_region(); | |
| 385 } | |
| 386 } | |
| 387 | |
| 388 gclog_or_tty->print_cr(""); | |
| 389 } | |
| 390 | |
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391 void G1CollectedHeap::push_dirty_cards_region(HeapRegion* hr) |
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392 { |
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393 // Claim the right to put the region on the dirty cards region list |
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394 // by installing a self pointer. |
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395 HeapRegion* next = hr->get_next_dirty_cards_region(); |
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396 if (next == NULL) { |
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397 HeapRegion* res = (HeapRegion*) |
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398 Atomic::cmpxchg_ptr(hr, hr->next_dirty_cards_region_addr(), |
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399 NULL); |
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400 if (res == NULL) { |
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401 HeapRegion* head; |
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402 do { |
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403 // Put the region to the dirty cards region list. |
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404 head = _dirty_cards_region_list; |
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405 next = (HeapRegion*) |
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406 Atomic::cmpxchg_ptr(hr, &_dirty_cards_region_list, head); |
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407 if (next == head) { |
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408 assert(hr->get_next_dirty_cards_region() == hr, |
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409 "hr->get_next_dirty_cards_region() != hr"); |
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410 if (next == NULL) { |
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411 // The last region in the list points to itself. |
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412 hr->set_next_dirty_cards_region(hr); |
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413 } else { |
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414 hr->set_next_dirty_cards_region(next); |
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415 } |
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416 } |
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417 } while (next != head); |
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418 } |
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419 } |
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420 } |
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421 |
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422 HeapRegion* G1CollectedHeap::pop_dirty_cards_region() |
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423 { |
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424 HeapRegion* head; |
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425 HeapRegion* hr; |
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426 do { |
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427 head = _dirty_cards_region_list; |
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428 if (head == NULL) { |
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429 return NULL; |
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430 } |
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431 HeapRegion* new_head = head->get_next_dirty_cards_region(); |
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432 if (head == new_head) { |
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433 // The last region. |
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434 new_head = NULL; |
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435 } |
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436 hr = (HeapRegion*)Atomic::cmpxchg_ptr(new_head, &_dirty_cards_region_list, |
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437 head); |
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438 } while (hr != head); |
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439 assert(hr != NULL, "invariant"); |
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440 hr->set_next_dirty_cards_region(NULL); |
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441 return hr; |
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442 } |
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443 |
| 342 | 444 void G1CollectedHeap::stop_conc_gc_threads() { |
| 794 | 445 _cg1r->stop(); |
| 342 | 446 _cmThread->stop(); |
| 447 } | |
| 448 | |
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449 #ifdef ASSERT |
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450 // A region is added to the collection set as it is retired |
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451 // so an address p can point to a region which will be in the |
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452 // collection set but has not yet been retired. This method |
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453 // therefore is only accurate during a GC pause after all |
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454 // regions have been retired. It is used for debugging |
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455 // to check if an nmethod has references to objects that can |
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456 // be move during a partial collection. Though it can be |
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457 // inaccurate, it is sufficient for G1 because the conservative |
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458 // implementation of is_scavengable() for G1 will indicate that |
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459 // all nmethods must be scanned during a partial collection. |
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460 bool G1CollectedHeap::is_in_partial_collection(const void* p) { |
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461 HeapRegion* hr = heap_region_containing(p); |
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462 return hr != NULL && hr->in_collection_set(); |
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463 } |
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464 #endif |
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465 |
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466 // Returns true if the reference points to an object that |
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467 // can move in an incremental collecction. |
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468 bool G1CollectedHeap::is_scavengable(const void* p) { |
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469 G1CollectedHeap* g1h = G1CollectedHeap::heap(); |
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470 G1CollectorPolicy* g1p = g1h->g1_policy(); |
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471 HeapRegion* hr = heap_region_containing(p); |
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472 if (hr == NULL) { |
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473 // perm gen (or null) |
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474 return false; |
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475 } else { |
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476 return !hr->isHumongous(); |
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477 } |
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478 } |
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479 |
| 342 | 480 void G1CollectedHeap::check_ct_logs_at_safepoint() { |
| 481 DirtyCardQueueSet& dcqs = JavaThread::dirty_card_queue_set(); | |
| 482 CardTableModRefBS* ct_bs = (CardTableModRefBS*)barrier_set(); | |
| 483 | |
| 484 // Count the dirty cards at the start. | |
| 485 CountNonCleanMemRegionClosure count1(this); | |
| 486 ct_bs->mod_card_iterate(&count1); | |
| 487 int orig_count = count1.n(); | |
| 488 | |
| 489 // First clear the logged cards. | |
| 490 ClearLoggedCardTableEntryClosure clear; | |
| 491 dcqs.set_closure(&clear); | |
| 492 dcqs.apply_closure_to_all_completed_buffers(); | |
| 493 dcqs.iterate_closure_all_threads(false); | |
| 494 clear.print_histo(); | |
| 495 | |
| 496 // Now ensure that there's no dirty cards. | |
| 497 CountNonCleanMemRegionClosure count2(this); | |
| 498 ct_bs->mod_card_iterate(&count2); | |
| 499 if (count2.n() != 0) { | |
| 500 gclog_or_tty->print_cr("Card table has %d entries; %d originally", | |
| 501 count2.n(), orig_count); | |
| 502 } | |
| 503 guarantee(count2.n() == 0, "Card table should be clean."); | |
| 504 | |
| 505 RedirtyLoggedCardTableEntryClosure redirty; | |
| 506 JavaThread::dirty_card_queue_set().set_closure(&redirty); | |
| 507 dcqs.apply_closure_to_all_completed_buffers(); | |
| 508 dcqs.iterate_closure_all_threads(false); | |
| 509 gclog_or_tty->print_cr("Log entries = %d, dirty cards = %d.", | |
| 510 clear.calls(), orig_count); | |
| 511 guarantee(redirty.calls() == clear.calls(), | |
| 512 "Or else mechanism is broken."); | |
| 513 | |
| 514 CountNonCleanMemRegionClosure count3(this); | |
| 515 ct_bs->mod_card_iterate(&count3); | |
| 516 if (count3.n() != orig_count) { | |
| 517 gclog_or_tty->print_cr("Should have restored them all: orig = %d, final = %d.", | |
| 518 orig_count, count3.n()); | |
| 519 guarantee(count3.n() >= orig_count, "Should have restored them all."); | |
| 520 } | |
| 521 | |
| 522 JavaThread::dirty_card_queue_set().set_closure(_refine_cte_cl); | |
| 523 } | |
| 524 | |
| 525 // Private class members. | |
| 526 | |
| 527 G1CollectedHeap* G1CollectedHeap::_g1h; | |
| 528 | |
| 529 // Private methods. | |
| 530 | |
| 2152 | 531 HeapRegion* |
| 2361 | 532 G1CollectedHeap::new_region_try_secondary_free_list() { |
| 2152 | 533 MutexLockerEx x(SecondaryFreeList_lock, Mutex::_no_safepoint_check_flag); |
| 534 while (!_secondary_free_list.is_empty() || free_regions_coming()) { | |
| 535 if (!_secondary_free_list.is_empty()) { | |
| 536 if (G1ConcRegionFreeingVerbose) { | |
| 537 gclog_or_tty->print_cr("G1ConcRegionFreeing [region alloc] : " | |
| 538 "secondary_free_list has "SIZE_FORMAT" entries", | |
| 539 _secondary_free_list.length()); | |
| 540 } | |
| 541 // It looks as if there are free regions available on the | |
| 542 // secondary_free_list. Let's move them to the free_list and try | |
| 543 // again to allocate from it. | |
| 544 append_secondary_free_list(); | |
| 545 | |
| 546 assert(!_free_list.is_empty(), "if the secondary_free_list was not " | |
| 547 "empty we should have moved at least one entry to the free_list"); | |
| 548 HeapRegion* res = _free_list.remove_head(); | |
| 549 if (G1ConcRegionFreeingVerbose) { | |
| 550 gclog_or_tty->print_cr("G1ConcRegionFreeing [region alloc] : " | |
| 551 "allocated "HR_FORMAT" from secondary_free_list", | |
| 552 HR_FORMAT_PARAMS(res)); | |
| 553 } | |
| 554 return res; | |
| 555 } | |
| 556 | |
| 557 // Wait here until we get notifed either when (a) there are no | |
| 558 // more free regions coming or (b) some regions have been moved on | |
| 559 // the secondary_free_list. | |
| 560 SecondaryFreeList_lock->wait(Mutex::_no_safepoint_check_flag); | |
| 561 } | |
| 562 | |
| 563 if (G1ConcRegionFreeingVerbose) { | |
| 564 gclog_or_tty->print_cr("G1ConcRegionFreeing [region alloc] : " | |
| 565 "could not allocate from secondary_free_list"); | |
| 566 } | |
| 567 return NULL; | |
| 568 } | |
| 569 | |
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570 HeapRegion* G1CollectedHeap::new_region(size_t word_size, bool do_expand) { |
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571 assert(!isHumongous(word_size) || word_size <= HeapRegion::GrainWords, |
| 2152 | 572 "the only time we use this to allocate a humongous region is " |
| 573 "when we are allocating a single humongous region"); | |
| 574 | |
| 575 HeapRegion* res; | |
| 576 if (G1StressConcRegionFreeing) { | |
| 577 if (!_secondary_free_list.is_empty()) { | |
| 578 if (G1ConcRegionFreeingVerbose) { | |
| 579 gclog_or_tty->print_cr("G1ConcRegionFreeing [region alloc] : " | |
| 580 "forced to look at the secondary_free_list"); | |
| 581 } | |
| 2361 | 582 res = new_region_try_secondary_free_list(); |
| 2152 | 583 if (res != NULL) { |
| 584 return res; | |
| 585 } | |
| 586 } | |
| 587 } | |
| 588 res = _free_list.remove_head_or_null(); | |
| 589 if (res == NULL) { | |
| 590 if (G1ConcRegionFreeingVerbose) { | |
| 591 gclog_or_tty->print_cr("G1ConcRegionFreeing [region alloc] : " | |
| 592 "res == NULL, trying the secondary_free_list"); | |
| 593 } | |
| 2361 | 594 res = new_region_try_secondary_free_list(); |
| 2152 | 595 } |
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596 if (res == NULL && do_expand && _expand_heap_after_alloc_failure) { |
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597 // Currently, only attempts to allocate GC alloc regions set |
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598 // do_expand to true. So, we should only reach here during a |
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599 // safepoint. If this assumption changes we might have to |
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600 // reconsider the use of _expand_heap_after_alloc_failure. |
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601 assert(SafepointSynchronize::is_at_safepoint(), "invariant"); |
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602 |
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603 ergo_verbose1(ErgoHeapSizing, |
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604 "attempt heap expansion", |
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605 ergo_format_reason("region allocation request failed") |
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606 ergo_format_byte("allocation request"), |
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607 word_size * HeapWordSize); |
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608 if (expand(word_size * HeapWordSize)) { |
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609 // Given that expand() succeeded in expanding the heap, and we |
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610 // always expand the heap by an amount aligned to the heap |
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611 // region size, the free list should in theory not be empty. So |
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612 // it would probably be OK to use remove_head(). But the extra |
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613 // check for NULL is unlikely to be a performance issue here (we |
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614 // just expanded the heap!) so let's just be conservative and |
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615 // use remove_head_or_null(). |
| 3766 | 616 res = _free_list.remove_head_or_null(); |
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617 } else { |
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618 _expand_heap_after_alloc_failure = false; |
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619 } |
| 342 | 620 } |
| 621 return res; | |
| 622 } | |
| 623 | |
| 3766 | 624 size_t G1CollectedHeap::humongous_obj_allocate_find_first(size_t num_regions, |
| 625 size_t word_size) { | |
| 2361 | 626 assert(isHumongous(word_size), "word_size should be humongous"); |
| 627 assert(num_regions * HeapRegion::GrainWords >= word_size, "pre-condition"); | |
| 628 | |
| 3766 | 629 size_t first = G1_NULL_HRS_INDEX; |
| 2152 | 630 if (num_regions == 1) { |
| 631 // Only one region to allocate, no need to go through the slower | |
| 632 // path. The caller will attempt the expasion if this fails, so | |
| 633 // let's not try to expand here too. | |
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634 HeapRegion* hr = new_region(word_size, false /* do_expand */); |
| 2152 | 635 if (hr != NULL) { |
| 636 first = hr->hrs_index(); | |
| 637 } else { | |
| 3766 | 638 first = G1_NULL_HRS_INDEX; |
| 2152 | 639 } |
| 640 } else { | |
| 641 // We can't allocate humongous regions while cleanupComplete() is | |
| 642 // running, since some of the regions we find to be empty might not | |
| 643 // yet be added to the free list and it is not straightforward to | |
| 644 // know which list they are on so that we can remove them. Note | |
| 645 // that we only need to do this if we need to allocate more than | |
| 646 // one region to satisfy the current humongous allocation | |
| 647 // request. If we are only allocating one region we use the common | |
| 648 // region allocation code (see above). | |
| 649 wait_while_free_regions_coming(); | |
| 2361 | 650 append_secondary_free_list_if_not_empty_with_lock(); |
| 2152 | 651 |
| 652 if (free_regions() >= num_regions) { | |
| 3766 | 653 first = _hrs.find_contiguous(num_regions); |
| 654 if (first != G1_NULL_HRS_INDEX) { | |
| 655 for (size_t i = first; i < first + num_regions; ++i) { | |
| 656 HeapRegion* hr = region_at(i); | |
| 2152 | 657 assert(hr->is_empty(), "sanity"); |
| 2361 | 658 assert(is_on_master_free_list(hr), "sanity"); |
| 2152 | 659 hr->set_pending_removal(true); |
| 660 } | |
| 661 _free_list.remove_all_pending(num_regions); | |
| 662 } | |
| 663 } | |
| 664 } | |
| 665 return first; | |
| 666 } | |
| 667 | |
| 2361 | 668 HeapWord* |
| 3766 | 669 G1CollectedHeap::humongous_obj_allocate_initialize_regions(size_t first, |
| 2361 | 670 size_t num_regions, |
| 671 size_t word_size) { | |
| 3766 | 672 assert(first != G1_NULL_HRS_INDEX, "pre-condition"); |
| 2361 | 673 assert(isHumongous(word_size), "word_size should be humongous"); |
| 674 assert(num_regions * HeapRegion::GrainWords >= word_size, "pre-condition"); | |
| 675 | |
| 676 // Index of last region in the series + 1. | |
| 3766 | 677 size_t last = first + num_regions; |
| 2361 | 678 |
| 679 // We need to initialize the region(s) we just discovered. This is | |
| 680 // a bit tricky given that it can happen concurrently with | |
| 681 // refinement threads refining cards on these regions and | |
| 682 // potentially wanting to refine the BOT as they are scanning | |
| 683 // those cards (this can happen shortly after a cleanup; see CR | |
| 684 // 6991377). So we have to set up the region(s) carefully and in | |
| 685 // a specific order. | |
| 686 | |
| 687 // The word size sum of all the regions we will allocate. | |
| 688 size_t word_size_sum = num_regions * HeapRegion::GrainWords; | |
| 689 assert(word_size <= word_size_sum, "sanity"); | |
| 690 | |
| 691 // This will be the "starts humongous" region. | |
| 3766 | 692 HeapRegion* first_hr = region_at(first); |
| 2361 | 693 // The header of the new object will be placed at the bottom of |
| 694 // the first region. | |
| 695 HeapWord* new_obj = first_hr->bottom(); | |
| 696 // This will be the new end of the first region in the series that | |
| 697 // should also match the end of the last region in the seriers. | |
| 698 HeapWord* new_end = new_obj + word_size_sum; | |
| 699 // This will be the new top of the first region that will reflect | |
| 700 // this allocation. | |
| 701 HeapWord* new_top = new_obj + word_size; | |
| 702 | |
| 703 // First, we need to zero the header of the space that we will be | |
| 704 // allocating. When we update top further down, some refinement | |
| 705 // threads might try to scan the region. By zeroing the header we | |
| 706 // ensure that any thread that will try to scan the region will | |
| 707 // come across the zero klass word and bail out. | |
| 708 // | |
| 709 // NOTE: It would not have been correct to have used | |
| 710 // CollectedHeap::fill_with_object() and make the space look like | |
| 711 // an int array. The thread that is doing the allocation will | |
| 712 // later update the object header to a potentially different array | |
| 713 // type and, for a very short period of time, the klass and length | |
| 714 // fields will be inconsistent. This could cause a refinement | |
| 715 // thread to calculate the object size incorrectly. | |
| 716 Copy::fill_to_words(new_obj, oopDesc::header_size(), 0); | |
| 717 | |
| 718 // We will set up the first region as "starts humongous". This | |
| 719 // will also update the BOT covering all the regions to reflect | |
| 720 // that there is a single object that starts at the bottom of the | |
| 721 // first region. | |
| 722 first_hr->set_startsHumongous(new_top, new_end); | |
| 723 | |
| 724 // Then, if there are any, we will set up the "continues | |
| 725 // humongous" regions. | |
| 726 HeapRegion* hr = NULL; | |
| 3766 | 727 for (size_t i = first + 1; i < last; ++i) { |
| 728 hr = region_at(i); | |
| 2361 | 729 hr->set_continuesHumongous(first_hr); |
| 730 } | |
| 731 // If we have "continues humongous" regions (hr != NULL), then the | |
| 732 // end of the last one should match new_end. | |
| 733 assert(hr == NULL || hr->end() == new_end, "sanity"); | |
| 734 | |
| 735 // Up to this point no concurrent thread would have been able to | |
| 736 // do any scanning on any region in this series. All the top | |
| 737 // fields still point to bottom, so the intersection between | |
| 738 // [bottom,top] and [card_start,card_end] will be empty. Before we | |
| 739 // update the top fields, we'll do a storestore to make sure that | |
| 740 // no thread sees the update to top before the zeroing of the | |
| 741 // object header and the BOT initialization. | |
| 742 OrderAccess::storestore(); | |
| 743 | |
| 744 // Now that the BOT and the object header have been initialized, | |
| 745 // we can update top of the "starts humongous" region. | |
| 746 assert(first_hr->bottom() < new_top && new_top <= first_hr->end(), | |
| 747 "new_top should be in this region"); | |
| 748 first_hr->set_top(new_top); | |
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749 if (_hr_printer.is_active()) { |
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750 HeapWord* bottom = first_hr->bottom(); |
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751 HeapWord* end = first_hr->orig_end(); |
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752 if ((first + 1) == last) { |
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753 // the series has a single humongous region |
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754 _hr_printer.alloc(G1HRPrinter::SingleHumongous, first_hr, new_top); |
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755 } else { |
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756 // the series has more than one humongous regions |
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757 _hr_printer.alloc(G1HRPrinter::StartsHumongous, first_hr, end); |
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758 } |
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759 } |
| 2361 | 760 |
| 761 // Now, we will update the top fields of the "continues humongous" | |
| 762 // regions. The reason we need to do this is that, otherwise, | |
| 763 // these regions would look empty and this will confuse parts of | |
| 764 // G1. For example, the code that looks for a consecutive number | |
| 765 // of empty regions will consider them empty and try to | |
| 766 // re-allocate them. We can extend is_empty() to also include | |
| 767 // !continuesHumongous(), but it is easier to just update the top | |
| 768 // fields here. The way we set top for all regions (i.e., top == | |
| 769 // end for all regions but the last one, top == new_top for the | |
| 770 // last one) is actually used when we will free up the humongous | |
| 771 // region in free_humongous_region(). | |
| 772 hr = NULL; | |
| 3766 | 773 for (size_t i = first + 1; i < last; ++i) { |
| 774 hr = region_at(i); | |
| 2361 | 775 if ((i + 1) == last) { |
| 776 // last continues humongous region | |
| 777 assert(hr->bottom() < new_top && new_top <= hr->end(), | |
| 778 "new_top should fall on this region"); | |
| 779 hr->set_top(new_top); | |
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780 _hr_printer.alloc(G1HRPrinter::ContinuesHumongous, hr, new_top); |
| 2361 | 781 } else { |
| 782 // not last one | |
| 783 assert(new_top > hr->end(), "new_top should be above this region"); | |
| 784 hr->set_top(hr->end()); | |
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785 _hr_printer.alloc(G1HRPrinter::ContinuesHumongous, hr, hr->end()); |
| 2361 | 786 } |
| 787 } | |
| 788 // If we have continues humongous regions (hr != NULL), then the | |
| 789 // end of the last one should match new_end and its top should | |
| 790 // match new_top. | |
| 791 assert(hr == NULL || | |
| 792 (hr->end() == new_end && hr->top() == new_top), "sanity"); | |
| 793 | |
| 794 assert(first_hr->used() == word_size * HeapWordSize, "invariant"); | |
| 795 _summary_bytes_used += first_hr->used(); | |
| 796 _humongous_set.add(first_hr); | |
| 797 | |
| 798 return new_obj; | |
| 799 } | |
| 800 | |
| 342 | 801 // If could fit into free regions w/o expansion, try. |
| 802 // Otherwise, if can expand, do so. | |
| 803 // Otherwise, if using ex regions might help, try with ex given back. | |
| 1973 | 804 HeapWord* G1CollectedHeap::humongous_obj_allocate(size_t word_size) { |
| 2152 | 805 assert_heap_locked_or_at_safepoint(true /* should_be_vm_thread */); |
| 806 | |
| 807 verify_region_sets_optional(); | |
| 342 | 808 |
| 809 size_t num_regions = | |
| 1973 | 810 round_to(word_size, HeapRegion::GrainWords) / HeapRegion::GrainWords; |
| 342 | 811 size_t x_size = expansion_regions(); |
| 3766 | 812 size_t fs = _hrs.free_suffix(); |
| 813 size_t first = humongous_obj_allocate_find_first(num_regions, word_size); | |
| 814 if (first == G1_NULL_HRS_INDEX) { | |
| 2152 | 815 // The only thing we can do now is attempt expansion. |
| 342 | 816 if (fs + x_size >= num_regions) { |
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817 // If the number of regions we're trying to allocate for this |
|
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|
818 // object is at most the number of regions in the free suffix, |
|
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|
819 // then the call to humongous_obj_allocate_find_first() above |
|
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820 // should have succeeded and we wouldn't be here. |
|
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|
821 // |
|
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|
822 // We should only be trying to expand when the free suffix is |
|
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|
823 // not sufficient for the object _and_ we have some expansion |
|
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|
824 // room available. |
|
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|
825 assert(num_regions > fs, "earlier allocation should have succeeded"); |
|
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|
826 |
|
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|
827 ergo_verbose1(ErgoHeapSizing, |
|
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|
828 "attempt heap expansion", |
|
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|
829 ergo_format_reason("humongous allocation request failed") |
|
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|
830 ergo_format_byte("allocation request"), |
|
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|
831 word_size * HeapWordSize); |
|
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832 if (expand((num_regions - fs) * HeapRegion::GrainBytes)) { |
| 3766 | 833 // Even though the heap was expanded, it might not have |
| 834 // reached the desired size. So, we cannot assume that the | |
| 835 // allocation will succeed. | |
|
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836 first = humongous_obj_allocate_find_first(num_regions, word_size); |
|
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|
837 } |
| 2152 | 838 } |
| 839 } | |
| 840 | |
| 2361 | 841 HeapWord* result = NULL; |
| 3766 | 842 if (first != G1_NULL_HRS_INDEX) { |
| 2361 | 843 result = |
| 844 humongous_obj_allocate_initialize_regions(first, num_regions, word_size); | |
| 845 assert(result != NULL, "it should always return a valid result"); | |
|
3980
8229bd737950
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|
846 |
|
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|
847 // A successful humongous object allocation changes the used space |
|
8229bd737950
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|
848 // information of the old generation so we need to recalculate the |
|
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|
849 // sizes and update the jstat counters here. |
|
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|
850 g1mm()->update_sizes(); |
| 2152 | 851 } |
| 852 | |
| 853 verify_region_sets_optional(); | |
| 2361 | 854 |
| 855 return result; | |
| 342 | 856 } |
| 857 | |
| 1973 | 858 HeapWord* G1CollectedHeap::allocate_new_tlab(size_t word_size) { |
| 859 assert_heap_not_locked_and_not_at_safepoint(); | |
|
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|
860 assert(!isHumongous(word_size), "we do not allow humongous TLABs"); |
|
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|
861 |
|
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|
862 unsigned int dummy_gc_count_before; |
|
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|
863 return attempt_allocation(word_size, &dummy_gc_count_before); |
| 342 | 864 } |
| 865 | |
| 866 HeapWord* | |
| 867 G1CollectedHeap::mem_allocate(size_t word_size, | |
| 1973 | 868 bool* gc_overhead_limit_was_exceeded) { |
| 869 assert_heap_not_locked_and_not_at_safepoint(); | |
| 342 | 870 |
|
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|
871 // Loop until the allocation is satisified, or unsatisfied after GC. |
| 1973 | 872 for (int try_count = 1; /* we'll return */; try_count += 1) { |
| 873 unsigned int gc_count_before; | |
|
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|
874 |
|
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|
875 HeapWord* result = NULL; |
|
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|
876 if (!isHumongous(word_size)) { |
|
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|
877 result = attempt_allocation(word_size, &gc_count_before); |
|
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|
878 } else { |
|
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|
879 result = attempt_allocation_humongous(word_size, &gc_count_before); |
|
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|
880 } |
|
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|
881 if (result != NULL) { |
|
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|
882 return result; |
| 342 | 883 } |
| 884 | |
| 885 // Create the garbage collection operation... | |
| 1973 | 886 VM_G1CollectForAllocation op(gc_count_before, word_size); |
| 342 | 887 // ...and get the VM thread to execute it. |
| 888 VMThread::execute(&op); | |
| 1973 | 889 |
| 890 if (op.prologue_succeeded() && op.pause_succeeded()) { | |
| 891 // If the operation was successful we'll return the result even | |
| 892 // if it is NULL. If the allocation attempt failed immediately | |
| 893 // after a Full GC, it's unlikely we'll be able to allocate now. | |
| 894 HeapWord* result = op.result(); | |
| 895 if (result != NULL && !isHumongous(word_size)) { | |
| 896 // Allocations that take place on VM operations do not do any | |
| 897 // card dirtying and we have to do it here. We only have to do | |
| 898 // this for non-humongous allocations, though. | |
| 899 dirty_young_block(result, word_size); | |
| 900 } | |
| 342 | 901 return result; |
| 1973 | 902 } else { |
| 903 assert(op.result() == NULL, | |
| 904 "the result should be NULL if the VM op did not succeed"); | |
| 342 | 905 } |
| 906 | |
| 907 // Give a warning if we seem to be looping forever. | |
| 908 if ((QueuedAllocationWarningCount > 0) && | |
| 909 (try_count % QueuedAllocationWarningCount == 0)) { | |
| 1973 | 910 warning("G1CollectedHeap::mem_allocate retries %d times", try_count); |
| 342 | 911 } |
| 912 } | |
| 1973 | 913 |
| 914 ShouldNotReachHere(); | |
|
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|
915 return NULL; |
| 342 | 916 } |
| 917 | |
|
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|
918 HeapWord* G1CollectedHeap::attempt_allocation_slow(size_t word_size, |
|
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|
919 unsigned int *gc_count_before_ret) { |
|
abdfc822206f
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|
920 // Make sure you read the note in attempt_allocation_humongous(). |
|
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|
921 |
|
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|
922 assert_heap_not_locked_and_not_at_safepoint(); |
|
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|
923 assert(!isHumongous(word_size), "attempt_allocation_slow() should not " |
|
abdfc822206f
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|
924 "be called for humongous allocation requests"); |
|
abdfc822206f
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|
925 |
|
abdfc822206f
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2432
diff
changeset
|
926 // We should only get here after the first-level allocation attempt |
|
abdfc822206f
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2432
diff
changeset
|
927 // (attempt_allocation()) failed to allocate. |
|
abdfc822206f
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2432
diff
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|
928 |
|
abdfc822206f
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2432
diff
changeset
|
929 // 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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diff
changeset
|
930 // allocation or b) we successfully schedule a collection which |
|
abdfc822206f
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diff
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|
931 // fails to perform the allocation. b) is the only case when we'll |
|
abdfc822206f
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diff
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|
932 // return NULL. |
|
abdfc822206f
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diff
changeset
|
933 HeapWord* result = NULL; |
|
abdfc822206f
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changeset
|
934 for (int try_count = 1; /* we'll return */; try_count += 1) { |
|
abdfc822206f
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diff
changeset
|
935 bool should_try_gc; |
|
abdfc822206f
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diff
changeset
|
936 unsigned int gc_count_before; |
|
abdfc822206f
7023069: G1: Introduce symmetric locking in the slow allocation path
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diff
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|
937 |
|
abdfc822206f
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2432
diff
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|
938 { |
|
abdfc822206f
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diff
changeset
|
939 MutexLockerEx x(Heap_lock); |
|
abdfc822206f
7023069: G1: Introduce symmetric locking in the slow allocation path
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diff
changeset
|
940 |
|
abdfc822206f
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diff
changeset
|
941 result = _mutator_alloc_region.attempt_allocation_locked(word_size, |
|
abdfc822206f
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diff
changeset
|
942 false /* bot_updates */); |
|
abdfc822206f
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diff
changeset
|
943 if (result != NULL) { |
|
abdfc822206f
7023069: G1: Introduce symmetric locking in the slow allocation path
tonyp
parents:
2432
diff
changeset
|
944 return result; |
|
abdfc822206f
7023069: G1: Introduce symmetric locking in the slow allocation path
tonyp
parents:
2432
diff
changeset
|
945 } |
|
abdfc822206f
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diff
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|
946 |
|
abdfc822206f
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diff
changeset
|
947 // If we reach here, attempt_allocation_locked() above failed to |
|
abdfc822206f
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diff
changeset
|
948 // allocate a new region. So the mutator alloc region should be NULL. |
|
abdfc822206f
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parents:
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diff
changeset
|
949 assert(_mutator_alloc_region.get() == NULL, "only way to get here"); |
|
abdfc822206f
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|
950 |
|
abdfc822206f
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diff
changeset
|
951 if (GC_locker::is_active_and_needs_gc()) { |
|
abdfc822206f
7023069: G1: Introduce symmetric locking in the slow allocation path
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diff
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|
952 if (g1_policy()->can_expand_young_list()) { |
|
3914
20213c8a3c40
7050392: G1: Introduce flag to generate a log of the G1 ergonomic decisions
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|
953 // No need for an ergo verbose message here, |
|
20213c8a3c40
7050392: G1: Introduce flag to generate a log of the G1 ergonomic decisions
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3886
diff
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|
954 // can_expand_young_list() does this when it returns true. |
|
2433
abdfc822206f
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|
955 result = _mutator_alloc_region.attempt_allocation_force(word_size, |
|
abdfc822206f
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diff
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|
956 false /* bot_updates */); |
|
abdfc822206f
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diff
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|
957 if (result != NULL) { |
|
abdfc822206f
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diff
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|
958 return result; |
|
abdfc822206f
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diff
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|
959 } |
|
abdfc822206f
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|
960 } |
|
abdfc822206f
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changeset
|
961 should_try_gc = false; |
|
abdfc822206f
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|
962 } else { |
|
abdfc822206f
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diff
changeset
|
963 // Read the GC count while still holding the Heap_lock. |
|
abdfc822206f
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|
964 gc_count_before = SharedHeap::heap()->total_collections(); |
|
abdfc822206f
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|
965 should_try_gc = true; |
|
abdfc822206f
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|
966 } |
|
abdfc822206f
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|
967 } |
|
abdfc822206f
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|
968 |
|
abdfc822206f
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|
969 if (should_try_gc) { |
|
abdfc822206f
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|
970 bool succeeded; |
|
abdfc822206f
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|
971 result = do_collection_pause(word_size, gc_count_before, &succeeded); |
|
abdfc822206f
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|
972 if (result != NULL) { |
|
abdfc822206f
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diff
changeset
|
973 assert(succeeded, "only way to get back a non-NULL result"); |
|
abdfc822206f
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|
974 return result; |
|
abdfc822206f
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2432
diff
changeset
|
975 } |
|
abdfc822206f
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diff
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|
976 |
|
abdfc822206f
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diff
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|
977 if (succeeded) { |
|
abdfc822206f
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diff
changeset
|
978 // If we get here we successfully scheduled a collection which |
|
abdfc822206f
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changeset
|
979 // failed to allocate. No point in trying to allocate |
|
abdfc822206f
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tonyp
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diff
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|
980 // further. We'll just return NULL. |
|
abdfc822206f
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changeset
|
981 MutexLockerEx x(Heap_lock); |
|
abdfc822206f
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diff
changeset
|
982 *gc_count_before_ret = SharedHeap::heap()->total_collections(); |
|
abdfc822206f
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changeset
|
983 return NULL; |
|
abdfc822206f
7023069: G1: Introduce symmetric locking in the slow allocation path
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parents:
2432
diff
changeset
|
984 } |
|
abdfc822206f
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diff
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|
985 } else { |
|
abdfc822206f
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changeset
|
986 GC_locker::stall_until_clear(); |
|
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987 } |
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988 |
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989 // We can reach here if we were unsuccessul in scheduling a |
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990 // collection (because another thread beat us to it) or if we were |
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991 // stalled due to the GC locker. In either can we should retry the |
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992 // allocation attempt in case another thread successfully |
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993 // performed a collection and reclaimed enough space. We do the |
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994 // first attempt (without holding the Heap_lock) here and the |
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995 // follow-on attempt will be at the start of the next loop |
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996 // iteration (after taking the Heap_lock). |
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997 result = _mutator_alloc_region.attempt_allocation(word_size, |
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998 false /* bot_updates */); |
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999 if (result != NULL ){ |
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1000 return result; |
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1001 } |
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1002 |
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1003 // Give a warning if we seem to be looping forever. |
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1004 if ((QueuedAllocationWarningCount > 0) && |
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1005 (try_count % QueuedAllocationWarningCount == 0)) { |
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1006 warning("G1CollectedHeap::attempt_allocation_slow() " |
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1007 "retries %d times", try_count); |
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1008 } |
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1009 } |
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1010 |
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1011 ShouldNotReachHere(); |
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1012 return NULL; |
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1013 } |
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1014 |
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1015 HeapWord* G1CollectedHeap::attempt_allocation_humongous(size_t word_size, |
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1016 unsigned int * gc_count_before_ret) { |
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1017 // The structure of this method has a lot of similarities to |
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1018 // attempt_allocation_slow(). The reason these two were not merged |
|
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1019 // into a single one is that such a method would require several "if |
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1020 // allocation is not humongous do this, otherwise do that" |
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1021 // conditional paths which would obscure its flow. In fact, an early |
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1022 // version of this code did use a unified method which was harder to |
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1023 // follow and, as a result, it had subtle bugs that were hard to |
|
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1024 // track down. So keeping these two methods separate allows each to |
|
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1025 // be more readable. It will be good to keep these two in sync as |
|
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1026 // much as possible. |
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1027 |
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1028 assert_heap_not_locked_and_not_at_safepoint(); |
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1029 assert(isHumongous(word_size), "attempt_allocation_humongous() " |
|
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1030 "should only be called for humongous allocations"); |
|
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1031 |
|
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1032 // We will loop until a) we manage to successfully perform the |
|
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1033 // allocation or b) we successfully schedule a collection which |
|
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1034 // fails to perform the allocation. b) is the only case when we'll |
|
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1035 // return NULL. |
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1036 HeapWord* result = NULL; |
|
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1037 for (int try_count = 1; /* we'll return */; try_count += 1) { |
|
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1038 bool should_try_gc; |
|
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1039 unsigned int gc_count_before; |
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1040 |
|
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1041 { |
|
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1042 MutexLockerEx x(Heap_lock); |
|
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1043 |
|
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1044 // Given that humongous objects are not allocated in young |
|
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1045 // regions, we'll first try to do the allocation without doing a |
|
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1046 // collection hoping that there's enough space in the heap. |
|
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1047 result = humongous_obj_allocate(word_size); |
|
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1048 if (result != NULL) { |
|
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1049 return result; |
|
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|
1050 } |
|
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1051 |
|
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1052 if (GC_locker::is_active_and_needs_gc()) { |
|
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1053 should_try_gc = false; |
|
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1054 } else { |
|
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1055 // Read the GC count while still holding the Heap_lock. |
|
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1056 gc_count_before = SharedHeap::heap()->total_collections(); |
|
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1057 should_try_gc = true; |
|
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1058 } |
|
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1059 } |
|
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1060 |
|
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1061 if (should_try_gc) { |
|
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1062 // If we failed to allocate the humongous object, we should try to |
|
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1063 // do a collection pause (if we're allowed) in case it reclaims |
|
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1064 // enough space for the allocation to succeed after the pause. |
|
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|
1065 |
|
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|
1066 bool succeeded; |
|
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1067 result = do_collection_pause(word_size, gc_count_before, &succeeded); |
|
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1068 if (result != NULL) { |
|
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1069 assert(succeeded, "only way to get back a non-NULL result"); |
|
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|
1070 return result; |
|
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|
1071 } |
|
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|
1072 |
|
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|
1073 if (succeeded) { |
|
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|
1074 // If we get here we successfully scheduled a collection which |
|
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|
1075 // failed to allocate. No point in trying to allocate |
|
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1076 // further. We'll just return NULL. |
|
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1077 MutexLockerEx x(Heap_lock); |
|
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1078 *gc_count_before_ret = SharedHeap::heap()->total_collections(); |
|
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|
1079 return NULL; |
|
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|
1080 } |
|
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|
1081 } else { |
|
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|
1082 GC_locker::stall_until_clear(); |
|
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|
1083 } |
|
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|
1084 |
|
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|
1085 // We can reach here if we were unsuccessul in scheduling a |
|
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|
1086 // collection (because another thread beat us to it) or if we were |
|
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1087 // stalled due to the GC locker. In either can we should retry the |
|
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|
1088 // allocation attempt in case another thread successfully |
|
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|
1089 // performed a collection and reclaimed enough space. Give a |
|
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|
1090 // warning if we seem to be looping forever. |
|
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|
1091 |
|
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|
1092 if ((QueuedAllocationWarningCount > 0) && |
|
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|
1093 (try_count % QueuedAllocationWarningCount == 0)) { |
|
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|
1094 warning("G1CollectedHeap::attempt_allocation_humongous() " |
|
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1095 "retries %d times", try_count); |
|
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|
1096 } |
|
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|
1097 } |
|
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|
1098 |
|
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|
1099 ShouldNotReachHere(); |
|
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|
1100 return NULL; |
|
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|
1101 } |
|
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|
1102 |
|
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|
1103 HeapWord* G1CollectedHeap::attempt_allocation_at_safepoint(size_t word_size, |
|
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|
1104 bool expect_null_mutator_alloc_region) { |
| 2152 | 1105 assert_at_safepoint(true /* should_be_vm_thread */); |
|
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1106 assert(_mutator_alloc_region.get() == NULL || |
|
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1107 !expect_null_mutator_alloc_region, |
|
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|
1108 "the current alloc region was unexpectedly found to be non-NULL"); |
|
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|
1109 |
|
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|
1110 if (!isHumongous(word_size)) { |
|
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|
1111 return _mutator_alloc_region.attempt_allocation_locked(word_size, |
|
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1112 false /* bot_updates */); |
|
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1113 } else { |
|
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1114 return humongous_obj_allocate(word_size); |
|
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1115 } |
|
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1116 |
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1117 ShouldNotReachHere(); |
| 342 | 1118 } |
| 1119 | |
| 1120 class PostMCRemSetClearClosure: public HeapRegionClosure { | |
| 1121 ModRefBarrierSet* _mr_bs; | |
| 1122 public: | |
| 1123 PostMCRemSetClearClosure(ModRefBarrierSet* mr_bs) : _mr_bs(mr_bs) {} | |
| 1124 bool doHeapRegion(HeapRegion* r) { | |
| 1125 r->reset_gc_time_stamp(); | |
| 1126 if (r->continuesHumongous()) | |
| 1127 return false; | |
| 1128 HeapRegionRemSet* hrrs = r->rem_set(); | |
| 1129 if (hrrs != NULL) hrrs->clear(); | |
| 1130 // You might think here that we could clear just the cards | |
| 1131 // corresponding to the used region. But no: if we leave a dirty card | |
| 1132 // in a region we might allocate into, then it would prevent that card | |
| 1133 // from being enqueued, and cause it to be missed. | |
| 1134 // Re: the performance cost: we shouldn't be doing full GC anyway! | |
| 1135 _mr_bs->clear(MemRegion(r->bottom(), r->end())); | |
| 1136 return false; | |
| 1137 } | |
| 1138 }; | |
| 1139 | |
| 1140 | |
| 1141 class PostMCRemSetInvalidateClosure: public HeapRegionClosure { | |
| 1142 ModRefBarrierSet* _mr_bs; | |
| 1143 public: | |
| 1144 PostMCRemSetInvalidateClosure(ModRefBarrierSet* mr_bs) : _mr_bs(mr_bs) {} | |
| 1145 bool doHeapRegion(HeapRegion* r) { | |
| 1146 if (r->continuesHumongous()) return false; | |
| 1147 if (r->used_region().word_size() != 0) { | |
| 1148 _mr_bs->invalidate(r->used_region(), true /*whole heap*/); | |
| 1149 } | |
| 1150 return false; | |
| 1151 } | |
| 1152 }; | |
| 1153 | |
|
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1154 class RebuildRSOutOfRegionClosure: public HeapRegionClosure { |
|
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1155 G1CollectedHeap* _g1h; |
|
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1156 UpdateRSOopClosure _cl; |
|
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1157 int _worker_i; |
|
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1158 public: |
|
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1159 RebuildRSOutOfRegionClosure(G1CollectedHeap* g1, int worker_i = 0) : |
| 1861 | 1160 _cl(g1->g1_rem_set(), worker_i), |
|
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1161 _worker_i(worker_i), |
|
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1162 _g1h(g1) |
|
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1163 { } |
|
1960
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1164 |
|
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1165 bool doHeapRegion(HeapRegion* r) { |
|
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1166 if (!r->continuesHumongous()) { |
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1167 _cl.set_from(r); |
|
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1168 r->oop_iterate(&_cl); |
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1169 } |
|
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1170 return false; |
|
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1171 } |
|
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1172 }; |
|
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1173 |
|
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1174 class ParRebuildRSTask: public AbstractGangTask { |
|
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1175 G1CollectedHeap* _g1; |
|
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1176 public: |
|
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1177 ParRebuildRSTask(G1CollectedHeap* g1) |
|
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1178 : AbstractGangTask("ParRebuildRSTask"), |
|
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1179 _g1(g1) |
|
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1180 { } |
|
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1181 |
|
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1182 void work(uint worker_id) { |
|
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1183 RebuildRSOutOfRegionClosure rebuild_rs(_g1, worker_id); |
|
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1184 _g1->heap_region_par_iterate_chunked(&rebuild_rs, worker_id, |
|
4095
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1185 _g1->workers()->active_workers(), |
|
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1186 HeapRegion::RebuildRSClaimValue); |
|
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1187 } |
|
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1188 }; |
|
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1189 |
|
3778
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1190 class PostCompactionPrinterClosure: public HeapRegionClosure { |
|
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1191 private: |
|
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1192 G1HRPrinter* _hr_printer; |
|
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1193 public: |
|
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1194 bool doHeapRegion(HeapRegion* hr) { |
|
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1195 assert(!hr->is_young(), "not expecting to find young regions"); |
|
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1196 // We only generate output for non-empty regions. |
|
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1197 if (!hr->is_empty()) { |
|
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1198 if (!hr->isHumongous()) { |
|
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1199 _hr_printer->post_compaction(hr, G1HRPrinter::Old); |
|
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|
1200 } else if (hr->startsHumongous()) { |
|
3986
65a8ff39a6da
7095194: G1: HeapRegion::GrainBytes, GrainWords, and CardsPerRegion should be size_t
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|
1201 if (hr->capacity() == HeapRegion::GrainBytes) { |
|
3778
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1202 // single humongous region |
|
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1203 _hr_printer->post_compaction(hr, G1HRPrinter::SingleHumongous); |
|
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1204 } else { |
|
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|
1205 _hr_printer->post_compaction(hr, G1HRPrinter::StartsHumongous); |
|
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1206 } |
|
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1207 } else { |
|
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|
1208 assert(hr->continuesHumongous(), "only way to get here"); |
|
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1209 _hr_printer->post_compaction(hr, G1HRPrinter::ContinuesHumongous); |
|
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1210 } |
|
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|
1211 } |
|
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|
1212 return false; |
|
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|
1213 } |
|
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|
1214 |
|
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|
1215 PostCompactionPrinterClosure(G1HRPrinter* hr_printer) |
|
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1216 : _hr_printer(hr_printer) { } |
|
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1217 }; |
|
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|
1218 |
| 1973 | 1219 bool G1CollectedHeap::do_collection(bool explicit_gc, |
|
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|
1220 bool clear_all_soft_refs, |
| 342 | 1221 size_t word_size) { |
| 2152 | 1222 assert_at_safepoint(true /* should_be_vm_thread */); |
| 1223 | |
|
1359
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|
1224 if (GC_locker::check_active_before_gc()) { |
| 1973 | 1225 return false; |
|
1359
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|
1226 } |
|
23b1b27ac76c
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|
1227 |
|
2125
7246a374a9f2
6458402: 3 jvmti tests fail with CMS and +ExplicitGCInvokesConcurrent
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|
1228 SvcGCMarker sgcm(SvcGCMarker::FULL); |
| 342 | 1229 ResourceMark rm; |
| 1230 | |
|
4872
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7141200: log some interesting information in ring buffers for crashes
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|
1231 print_heap_before_gc(); |
|
838
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|
1232 |
| 4072 | 1233 HRSPhaseSetter x(HRSPhaseFullGC); |
| 2152 | 1234 verify_region_sets_optional(); |
| 342 | 1235 |
|
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|
1236 const bool do_clear_all_soft_refs = clear_all_soft_refs || |
|
0bfd3fb24150
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|
1237 collector_policy()->should_clear_all_soft_refs(); |
|
0bfd3fb24150
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|
1238 |
|
0bfd3fb24150
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|
1239 ClearedAllSoftRefs casr(do_clear_all_soft_refs, collector_policy()); |
|
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|
1240 |
| 342 | 1241 { |
| 1242 IsGCActiveMark x; | |
| 1243 | |
| 1244 // Timing | |
|
1656
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|
1245 bool system_gc = (gc_cause() == GCCause::_java_lang_system_gc); |
|
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|
1246 assert(!system_gc || explicit_gc, "invariant"); |
| 342 | 1247 gclog_or_tty->date_stamp(PrintGC && PrintGCDateStamps); |
| 1248 TraceCPUTime tcpu(PrintGCDetails, true, gclog_or_tty); | |
|
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|
1249 TraceTime t(system_gc ? "Full GC (System.gc())" : "Full GC", |
|
1387
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|
1250 PrintGC, true, gclog_or_tty); |
| 342 | 1251 |
|
3289
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6946417: G1: Java VisualVM does not support G1 properly.
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|
1252 TraceCollectorStats tcs(g1mm()->full_collection_counters()); |
|
3356
78542e2b5e35
7036199: Adding a notification to the implementation of GarbageCollectorMXBeans
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|
1253 TraceMemoryManagerStats tms(true /* fullGC */, gc_cause()); |
|
1089
db0d5eba9d20
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|
1254 |
| 342 | 1255 double start = os::elapsedTime(); |
| 1256 g1_policy()->record_full_collection_start(); | |
| 1257 | |
| 2152 | 1258 wait_while_free_regions_coming(); |
| 2361 | 1259 append_secondary_free_list_if_not_empty_with_lock(); |
| 2152 | 1260 |
| 342 | 1261 gc_prologue(true); |
|
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|
1262 increment_total_collections(true /* full gc */); |
| 342 | 1263 |
| 1264 size_t g1h_prev_used = used(); | |
| 1265 assert(used() == recalculate_used(), "Should be equal"); | |
| 1266 | |
| 1267 if (VerifyBeforeGC && total_collections() >= VerifyGCStartAt) { | |
| 1268 HandleMark hm; // Discard invalid handles created during verification | |
|
2433
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|
1269 gclog_or_tty->print(" VerifyBeforeGC:"); |
| 342 | 1270 prepare_for_verify(); |
|
3772
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|
1271 Universe::verify(/* allow dirty */ true, |
|
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|
1272 /* silent */ false, |
|
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|
1273 /* option */ VerifyOption_G1UsePrevMarking); |
|
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|
1274 |
| 342 | 1275 } |
|
3869
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|
1276 pre_full_gc_dump(); |
| 342 | 1277 |
| 1278 COMPILER2_PRESENT(DerivedPointerTable::clear()); | |
| 1279 | |
|
3979
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|
1280 // Disable discovery and empty the discovered lists |
|
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|
1281 // for the CM ref processor. |
|
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|
1282 ref_processor_cm()->disable_discovery(); |
|
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|
1283 ref_processor_cm()->abandon_partial_discovery(); |
|
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|
1284 ref_processor_cm()->verify_no_references_recorded(); |
| 342 | 1285 |
| 1286 // Abandon current iterations of concurrent marking and concurrent | |
| 1287 // refinement, if any are in progress. | |
| 1288 concurrent_mark()->abort(); | |
| 1289 | |
| 1290 // Make sure we'll choose a new allocation region afterwards. | |
|
2433
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|
1291 release_mutator_alloc_region(); |
| 636 | 1292 abandon_gc_alloc_regions(); |
| 1861 | 1293 g1_rem_set()->cleanupHRRS(); |
|
1394
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1294 |
|
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1295 // We should call this after we retire any currently active alloc |
|
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1296 // regions so that all the ALLOC / RETIRE events are generated |
|
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|
1297 // before the start GC event. |
|
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|
1298 _hr_printer.start_gc(true /* full */, (size_t) total_collections()); |
|
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1299 |
|
1394
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1300 // We may have added regions to the current incremental collection |
|
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1301 // set between the last GC or pause and now. We need to clear the |
|
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1302 // incremental collection set and then start rebuilding it afresh |
|
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1303 // after this full GC. |
|
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|
1304 abandon_collection_set(g1_policy()->inc_cset_head()); |
|
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|
1305 g1_policy()->clear_incremental_cset(); |
|
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1306 g1_policy()->stop_incremental_cset_building(); |
|
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1307 |
| 4072 | 1308 tear_down_region_sets(false /* free_list_only */); |
| 4710 | 1309 g1_policy()->set_gcs_are_young(true); |
| 342 | 1310 |
|
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1311 // See the comments in g1CollectedHeap.hpp and |
|
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1312 // G1CollectedHeap::ref_processing_init() about |
|
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|
1313 // how reference processing currently works in G1. |
|
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1314 |
|
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1315 // Temporarily make discovery by the STW ref processor single threaded (non-MT). |
|
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|
1316 ReferenceProcessorMTDiscoveryMutator stw_rp_disc_ser(ref_processor_stw(), false); |
|
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1317 |
|
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1318 // Temporarily clear the STW ref processor's _is_alive_non_header field. |
|
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|
1319 ReferenceProcessorIsAliveMutator stw_rp_is_alive_null(ref_processor_stw(), NULL); |
|
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1320 |
|
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|
1321 ref_processor_stw()->enable_discovery(true /*verify_disabled*/, true /*verify_no_refs*/); |
|
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|
1322 ref_processor_stw()->setup_policy(do_clear_all_soft_refs); |
|
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1323 |
| 342 | 1324 // Do collection work |
| 1325 { | |
| 1326 HandleMark hm; // Discard invalid handles created during gc | |
|
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|
1327 G1MarkSweep::invoke_at_safepoint(ref_processor_stw(), do_clear_all_soft_refs); |
| 342 | 1328 } |
|
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1329 |
| 2152 | 1330 assert(free_regions() == 0, "we should not have added any free regions"); |
| 4072 | 1331 rebuild_region_sets(false /* free_list_only */); |
| 342 | 1332 |
|
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1333 // Enqueue any discovered reference objects that have |
|
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|
1334 // not been removed from the discovered lists. |
|
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|
1335 ref_processor_stw()->enqueue_discovered_references(); |
| 342 | 1336 |
| 1337 COMPILER2_PRESENT(DerivedPointerTable::update_pointers()); | |
| 1338 | |
|
1089
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|
1339 MemoryService::track_memory_usage(); |
|
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|
1340 |
| 342 | 1341 if (VerifyAfterGC && total_collections() >= VerifyGCStartAt) { |
| 1342 HandleMark hm; // Discard invalid handles created during verification | |
| 1343 gclog_or_tty->print(" VerifyAfterGC:"); | |
|
637
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diff
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|
1344 prepare_for_verify(); |
|
3772
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|
1345 Universe::verify(/* allow dirty */ false, |
|
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|
1346 /* silent */ false, |
|
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|
1347 /* option */ VerifyOption_G1UsePrevMarking); |
|
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|
1348 |
| 342 | 1349 } |
|
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|
1350 |
|
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|
1351 assert(!ref_processor_stw()->discovery_enabled(), "Postcondition"); |
|
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|
1352 ref_processor_stw()->verify_no_references_recorded(); |
|
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|
1353 |
|
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|
1354 // Note: since we've just done a full GC, concurrent |
|
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|
1355 // marking is no longer active. Therefore we need not |
|
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|
1356 // re-enable reference discovery for the CM ref processor. |
|
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|
1357 // That will be done at the start of the next marking cycle. |
|
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|
1358 assert(!ref_processor_cm()->discovery_enabled(), "Postcondition"); |
|
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|
1359 ref_processor_cm()->verify_no_references_recorded(); |
| 342 | 1360 |
| 1361 reset_gc_time_stamp(); | |
| 1362 // Since everything potentially moved, we will clear all remembered | |
|
626
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|
1363 // sets, and clear all cards. Later we will rebuild remebered |
|
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|
1364 // sets. We will also reset the GC time stamps of the regions. |
| 342 | 1365 PostMCRemSetClearClosure rs_clear(mr_bs()); |
| 1366 heap_region_iterate(&rs_clear); | |
| 1367 | |
| 1368 // Resize the heap if necessary. | |
|
1656
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|
1369 resize_if_necessary_after_full_collection(explicit_gc ? 0 : word_size); |
| 342 | 1370 |
|
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1371 if (_hr_printer.is_active()) { |
|
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|
1372 // We should do this after we potentially resize the heap so |
|
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|
1373 // that all the COMMIT / UNCOMMIT events are generated before |
|
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|
1374 // the end GC event. |
|
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|
1375 |
|
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|
1376 PostCompactionPrinterClosure cl(hr_printer()); |
|
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|
1377 heap_region_iterate(&cl); |
|
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|
1378 |
|
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|
1379 _hr_printer.end_gc(true /* full */, (size_t) total_collections()); |
|
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|
1380 } |
|
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|
1381 |
| 342 | 1382 if (_cg1r->use_cache()) { |
| 1383 _cg1r->clear_and_record_card_counts(); | |
| 1384 _cg1r->clear_hot_cache(); | |
| 1385 } | |
| 1386 | |
|
626
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|
1387 // Rebuild remembered sets of all regions. |
|
1833
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diff
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|
1388 if (G1CollectedHeap::use_parallel_gc_threads()) { |
|
4728
441e946dc1af
7121618: Change type of number of GC workers to unsigned int.
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|
1389 uint n_workers = |
|
4095
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|
1390 AdaptiveSizePolicy::calc_active_workers(workers()->total_workers(), |
|
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|
1391 workers()->active_workers(), |
|
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|
1392 Threads::number_of_non_daemon_threads()); |
|
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|
1393 assert(UseDynamicNumberOfGCThreads || |
|
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|
1394 n_workers == workers()->total_workers(), |
|
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|
1395 "If not dynamic should be using all the workers"); |
|
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|
1396 workers()->set_active_workers(n_workers); |
|
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|
1397 // Set parallel threads in the heap (_n_par_threads) only |
|
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|
1398 // before a parallel phase and always reset it to 0 after |
|
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|
1399 // the phase so that the number of parallel threads does |
|
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|
1400 // no get carried forward to a serial phase where there |
|
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|
1401 // may be code that is "possibly_parallel". |
|
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|
1402 set_par_threads(n_workers); |
|
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|
1403 |
|
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|
1404 ParRebuildRSTask rebuild_rs_task(this); |
|
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|
1405 assert(check_heap_region_claim_values( |
|
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|
1406 HeapRegion::InitialClaimValue), "sanity check"); |
|
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|
1407 assert(UseDynamicNumberOfGCThreads || |
|
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|
1408 workers()->active_workers() == workers()->total_workers(), |
|
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|
1409 "Unless dynamic should use total workers"); |
|
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|
1410 // Use the most recent number of active workers |
|
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|
1411 assert(workers()->active_workers() > 0, |
|
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|
1412 "Active workers not properly set"); |
|
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|
1413 set_par_threads(workers()->active_workers()); |
|
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|
1414 workers()->run_task(&rebuild_rs_task); |
|
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|
1415 set_par_threads(0); |
|
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|
1416 assert(check_heap_region_claim_values( |
|
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|
1417 HeapRegion::RebuildRSClaimValue), "sanity check"); |
|
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|
1418 reset_heap_region_claim_values(); |
|
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|
1419 } else { |
|
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|
1420 RebuildRSOutOfRegionClosure rebuild_rs(this); |
|
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|
1421 heap_region_iterate(&rebuild_rs); |
|
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|
1422 } |
|
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|
1423 |
| 342 | 1424 if (PrintGC) { |
| 1425 print_size_transition(gclog_or_tty, g1h_prev_used, used(), capacity()); | |
| 1426 } | |
| 1427 | |
| 1428 if (true) { // FIXME | |
| 1429 // Ask the permanent generation to adjust size for full collections | |
| 1430 perm()->compute_new_size(); | |
| 1431 } | |
| 1432 | |
|
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|
1433 // Start a new incremental collection set for the next pause |
|
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|
1434 assert(g1_policy()->collection_set() == NULL, "must be"); |
|
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|
1435 g1_policy()->start_incremental_cset_building(); |
|
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|
1436 |
|
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1437 // Clear the _cset_fast_test bitmap in anticipation of adding |
|
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1438 // regions to the incremental collection set for the next |
|
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1439 // evacuation pause. |
|
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|
1440 clear_cset_fast_test(); |
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1441 |
|
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1442 init_mutator_alloc_region(); |
|
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1443 |
| 342 | 1444 double end = os::elapsedTime(); |
| 1445 g1_policy()->record_full_collection_end(); | |
| 1446 | |
|
546
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|
1447 #ifdef TRACESPINNING |
|
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1448 ParallelTaskTerminator::print_termination_counts(); |
|
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1449 #endif |
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1450 |
| 342 | 1451 gc_epilogue(true); |
| 1452 | |
| 794 | 1453 // Discard all rset updates |
| 1454 JavaThread::dirty_card_queue_set().abandon_logs(); | |
|
616
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1455 assert(!G1DeferredRSUpdate |
|
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1456 || (G1DeferredRSUpdate && (dirty_card_queue_set().completed_buffers_num() == 0)), "Should not be any"); |
| 342 | 1457 } |
| 1458 | |
|
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1459 _young_list->reset_sampled_info(); |
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1460 // At this point there should be no regions in the |
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1461 // entire heap tagged as young. |
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1462 assert( check_young_list_empty(true /* check_heap */), |
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1463 "young list should be empty at this point"); |
|
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1464 |
|
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1465 // Update the number of full collections that have been completed. |
|
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1466 increment_full_collections_completed(false /* concurrent */); |
|
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1467 |
| 3766 | 1468 _hrs.verify_optional(); |
| 2152 | 1469 verify_region_sets_optional(); |
| 1470 | |
|
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1471 print_heap_after_gc(); |
|
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1472 g1mm()->update_sizes(); |
|
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1473 post_full_gc_dump(); |
| 1973 | 1474 |
| 1475 return true; | |
| 342 | 1476 } |
| 1477 | |
| 1478 void G1CollectedHeap::do_full_collection(bool clear_all_soft_refs) { | |
| 1973 | 1479 // do_collection() will return whether it succeeded in performing |
| 1480 // the GC. Currently, there is no facility on the | |
| 1481 // do_full_collection() API to notify the caller than the collection | |
| 1482 // did not succeed (e.g., because it was locked out by the GC | |
| 1483 // locker). So, right now, we'll ignore the return value. | |
| 1484 bool dummy = do_collection(true, /* explicit_gc */ | |
| 1485 clear_all_soft_refs, | |
| 1486 0 /* word_size */); | |
| 342 | 1487 } |
| 1488 | |
| 1489 // This code is mostly copied from TenuredGeneration. | |
| 1490 void | |
| 1491 G1CollectedHeap:: | |
| 1492 resize_if_necessary_after_full_collection(size_t word_size) { | |
| 1493 assert(MinHeapFreeRatio <= MaxHeapFreeRatio, "sanity check"); | |
| 1494 | |
| 1495 // Include the current allocation, if any, and bytes that will be | |
| 1496 // pre-allocated to support collections, as "used". | |
| 1497 const size_t used_after_gc = used(); | |
| 1498 const size_t capacity_after_gc = capacity(); | |
| 1499 const size_t free_after_gc = capacity_after_gc - used_after_gc; | |
| 1500 | |
|
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1501 // This is enforced in arguments.cpp. |
|
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1502 assert(MinHeapFreeRatio <= MaxHeapFreeRatio, |
|
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1503 "otherwise the code below doesn't make sense"); |
|
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1504 |
| 342 | 1505 // We don't have floating point command-line arguments |
|
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1506 const double minimum_free_percentage = (double) MinHeapFreeRatio / 100.0; |
| 342 | 1507 const double maximum_used_percentage = 1.0 - minimum_free_percentage; |
|
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1508 const double maximum_free_percentage = (double) MaxHeapFreeRatio / 100.0; |
| 342 | 1509 const double minimum_used_percentage = 1.0 - maximum_free_percentage; |
| 1510 | |
|
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1511 const size_t min_heap_size = collector_policy()->min_heap_byte_size(); |
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1512 const size_t max_heap_size = collector_policy()->max_heap_byte_size(); |
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1513 |
|
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1514 // We have to be careful here as these two calculations can overflow |
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1515 // 32-bit size_t's. |
|
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1516 double used_after_gc_d = (double) used_after_gc; |
|
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1517 double minimum_desired_capacity_d = used_after_gc_d / maximum_used_percentage; |
|
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1518 double maximum_desired_capacity_d = used_after_gc_d / minimum_used_percentage; |
|
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1519 |
|
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1520 // Let's make sure that they are both under the max heap size, which |
|
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1521 // by default will make them fit into a size_t. |
|
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|
1522 double desired_capacity_upper_bound = (double) max_heap_size; |
|
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1523 minimum_desired_capacity_d = MIN2(minimum_desired_capacity_d, |
|
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|
1524 desired_capacity_upper_bound); |
|
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1525 maximum_desired_capacity_d = MIN2(maximum_desired_capacity_d, |
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|
1526 desired_capacity_upper_bound); |
|
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|
1527 |
|
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|
1528 // We can now safely turn them into size_t's. |
|
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|
1529 size_t minimum_desired_capacity = (size_t) minimum_desired_capacity_d; |
|
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|
1530 size_t maximum_desired_capacity = (size_t) maximum_desired_capacity_d; |
|
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|
1531 |
|
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|
1532 // This assert only makes sense here, before we adjust them |
|
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|
1533 // with respect to the min and max heap size. |
|
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|
1534 assert(minimum_desired_capacity <= maximum_desired_capacity, |
|
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|
1535 err_msg("minimum_desired_capacity = "SIZE_FORMAT", " |
|
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|
1536 "maximum_desired_capacity = "SIZE_FORMAT, |
|
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|
1537 minimum_desired_capacity, maximum_desired_capacity)); |
|
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|
1538 |
|
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|
1539 // Should not be greater than the heap max size. No need to adjust |
|
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|
1540 // it with respect to the heap min size as it's a lower bound (i.e., |
|
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|
1541 // we'll try to make the capacity larger than it, not smaller). |
|
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|
1542 minimum_desired_capacity = MIN2(minimum_desired_capacity, max_heap_size); |
|
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|
1543 // Should not be less than the heap min size. No need to adjust it |
|
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|
1544 // with respect to the heap max size as it's an upper bound (i.e., |
|
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|
1545 // we'll try to make the capacity smaller than it, not greater). |
|
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|
1546 maximum_desired_capacity = MAX2(maximum_desired_capacity, min_heap_size); |
| 342 | 1547 |
|
1717
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|
1548 if (capacity_after_gc < minimum_desired_capacity) { |
| 342 | 1549 // Don't expand unless it's significant |
| 1550 size_t expand_bytes = minimum_desired_capacity - capacity_after_gc; | |
|
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|
1551 ergo_verbose4(ErgoHeapSizing, |
|
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|
1552 "attempt heap expansion", |
|
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|
1553 ergo_format_reason("capacity lower than " |
|
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|
1554 "min desired capacity after Full GC") |
|
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|
1555 ergo_format_byte("capacity") |
|
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|
1556 ergo_format_byte("occupancy") |
|
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|
1557 ergo_format_byte_perc("min desired capacity"), |
|
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|
1558 capacity_after_gc, used_after_gc, |
|
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|
1559 minimum_desired_capacity, (double) MinHeapFreeRatio); |
|
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|
1560 expand(expand_bytes); |
| 342 | 1561 |
| 1562 // No expansion, now see if we want to shrink | |
|
1717
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|
1563 } else if (capacity_after_gc > maximum_desired_capacity) { |
| 342 | 1564 // Capacity too large, compute shrinking size |
| 1565 size_t shrink_bytes = capacity_after_gc - maximum_desired_capacity; | |
|
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|
1566 ergo_verbose4(ErgoHeapSizing, |
|
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1567 "attempt heap shrinking", |
|
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|
1568 ergo_format_reason("capacity higher than " |
|
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|
1569 "max desired capacity after Full GC") |
|
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|
1570 ergo_format_byte("capacity") |
|
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|
1571 ergo_format_byte("occupancy") |
|
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|
1572 ergo_format_byte_perc("max desired capacity"), |
|
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|
1573 capacity_after_gc, used_after_gc, |
|
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|
1574 maximum_desired_capacity, (double) MaxHeapFreeRatio); |
| 342 | 1575 shrink(shrink_bytes); |
| 1576 } | |
| 1577 } | |
| 1578 | |
| 1579 | |
| 1580 HeapWord* | |
| 1973 | 1581 G1CollectedHeap::satisfy_failed_allocation(size_t word_size, |
| 1582 bool* succeeded) { | |
| 2152 | 1583 assert_at_safepoint(true /* should_be_vm_thread */); |
| 1973 | 1584 |
| 1585 *succeeded = true; | |
| 1586 // Let's attempt the allocation first. | |
|
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|
1587 HeapWord* result = |
|
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|
1588 attempt_allocation_at_safepoint(word_size, |
|
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|
1589 false /* expect_null_mutator_alloc_region */); |
| 1973 | 1590 if (result != NULL) { |
| 1591 assert(*succeeded, "sanity"); | |
| 1592 return result; | |
| 1593 } | |
| 342 | 1594 |
| 1595 // In a G1 heap, we're supposed to keep allocation from failing by | |
| 1596 // incremental pauses. Therefore, at least for now, we'll favor | |
| 1597 // expansion over collection. (This might change in the future if we can | |
| 1598 // do something smarter than full collection to satisfy a failed alloc.) | |
| 1599 result = expand_and_allocate(word_size); | |
| 1600 if (result != NULL) { | |
| 1973 | 1601 assert(*succeeded, "sanity"); |
| 342 | 1602 return result; |
| 1603 } | |
| 1604 | |
| 1973 | 1605 // Expansion didn't work, we'll try to do a Full GC. |
| 1606 bool gc_succeeded = do_collection(false, /* explicit_gc */ | |
| 1607 false, /* clear_all_soft_refs */ | |
| 1608 word_size); | |
| 1609 if (!gc_succeeded) { | |
| 1610 *succeeded = false; | |
| 1611 return NULL; | |
| 1612 } | |
| 1613 | |
| 1614 // Retry the allocation | |
| 1615 result = attempt_allocation_at_safepoint(word_size, | |
|
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1616 true /* expect_null_mutator_alloc_region */); |
| 342 | 1617 if (result != NULL) { |
| 1973 | 1618 assert(*succeeded, "sanity"); |
| 342 | 1619 return result; |
| 1620 } | |
| 1621 | |
| 1973 | 1622 // Then, try a Full GC that will collect all soft references. |
| 1623 gc_succeeded = do_collection(false, /* explicit_gc */ | |
| 1624 true, /* clear_all_soft_refs */ | |
| 1625 word_size); | |
| 1626 if (!gc_succeeded) { | |
| 1627 *succeeded = false; | |
| 1628 return NULL; | |
| 1629 } | |
| 1630 | |
| 1631 // Retry the allocation once more | |
| 1632 result = attempt_allocation_at_safepoint(word_size, | |
|
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1633 true /* expect_null_mutator_alloc_region */); |
| 342 | 1634 if (result != NULL) { |
| 1973 | 1635 assert(*succeeded, "sanity"); |
| 342 | 1636 return result; |
| 1637 } | |
| 1638 | |
|
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1639 assert(!collector_policy()->should_clear_all_soft_refs(), |
| 1973 | 1640 "Flag should have been handled and cleared prior to this point"); |
|
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1641 |
| 342 | 1642 // What else? We might try synchronous finalization later. If the total |
| 1643 // space available is large enough for the allocation, then a more | |
| 1644 // complete compaction phase than we've tried so far might be | |
| 1645 // appropriate. | |
| 1973 | 1646 assert(*succeeded, "sanity"); |
| 342 | 1647 return NULL; |
| 1648 } | |
| 1649 | |
| 1650 // Attempting to expand the heap sufficiently | |
| 1651 // to support an allocation of the given "word_size". If | |
| 1652 // successful, perform the allocation and return the address of the | |
| 1653 // allocated block, or else "NULL". | |
| 1654 | |
| 1655 HeapWord* G1CollectedHeap::expand_and_allocate(size_t word_size) { | |
| 2152 | 1656 assert_at_safepoint(true /* should_be_vm_thread */); |
| 1657 | |
| 1658 verify_region_sets_optional(); | |
| 1973 | 1659 |
|
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1660 size_t expand_bytes = MAX2(word_size * HeapWordSize, MinHeapDeltaBytes); |
|
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1661 ergo_verbose1(ErgoHeapSizing, |
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1662 "attempt heap expansion", |
|
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1663 ergo_format_reason("allocation request failed") |
|
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1664 ergo_format_byte("allocation request"), |
|
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1665 word_size * HeapWordSize); |
|
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1666 if (expand(expand_bytes)) { |
| 3766 | 1667 _hrs.verify_optional(); |
|
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1668 verify_region_sets_optional(); |
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1669 return attempt_allocation_at_safepoint(word_size, |
|
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1670 false /* expect_null_mutator_alloc_region */); |
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1671 } |
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1672 return NULL; |
| 342 | 1673 } |
| 1674 | |
| 3766 | 1675 void G1CollectedHeap::update_committed_space(HeapWord* old_end, |
| 1676 HeapWord* new_end) { | |
| 1677 assert(old_end != new_end, "don't call this otherwise"); | |
| 1678 assert((HeapWord*) _g1_storage.high() == new_end, "invariant"); | |
| 1679 | |
| 1680 // Update the committed mem region. | |
| 1681 _g1_committed.set_end(new_end); | |
| 1682 // Tell the card table about the update. | |
| 1683 Universe::heap()->barrier_set()->resize_covered_region(_g1_committed); | |
| 1684 // Tell the BOT about the update. | |
| 1685 _bot_shared->resize(_g1_committed.word_size()); | |
| 1686 } | |
| 1687 | |
|
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1688 bool G1CollectedHeap::expand(size_t expand_bytes) { |
| 342 | 1689 size_t old_mem_size = _g1_storage.committed_size(); |
|
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1690 size_t aligned_expand_bytes = ReservedSpace::page_align_size_up(expand_bytes); |
| 342 | 1691 aligned_expand_bytes = align_size_up(aligned_expand_bytes, |
| 1692 HeapRegion::GrainBytes); | |
|
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1693 ergo_verbose2(ErgoHeapSizing, |
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1694 "expand the heap", |
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1695 ergo_format_byte("requested expansion amount") |
|
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1696 ergo_format_byte("attempted expansion amount"), |
|
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1697 expand_bytes, aligned_expand_bytes); |
|
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1698 |
| 3766 | 1699 // First commit the memory. |
| 1700 HeapWord* old_end = (HeapWord*) _g1_storage.high(); | |
|
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1701 bool successful = _g1_storage.expand_by(aligned_expand_bytes); |
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1702 if (successful) { |
| 3766 | 1703 // Then propagate this update to the necessary data structures. |
| 1704 HeapWord* new_end = (HeapWord*) _g1_storage.high(); | |
| 1705 update_committed_space(old_end, new_end); | |
| 1706 | |
| 1707 FreeRegionList expansion_list("Local Expansion List"); | |
| 1708 MemRegion mr = _hrs.expand_by(old_end, new_end, &expansion_list); | |
| 1709 assert(mr.start() == old_end, "post-condition"); | |
| 1710 // mr might be a smaller region than what was requested if | |
| 1711 // expand_by() was unable to allocate the HeapRegion instances | |
| 1712 assert(mr.end() <= new_end, "post-condition"); | |
| 1713 | |
| 1714 size_t actual_expand_bytes = mr.byte_size(); | |
| 1715 assert(actual_expand_bytes <= aligned_expand_bytes, "post-condition"); | |
| 1716 assert(actual_expand_bytes == expansion_list.total_capacity_bytes(), | |
| 1717 "post-condition"); | |
| 1718 if (actual_expand_bytes < aligned_expand_bytes) { | |
| 1719 // We could not expand _hrs to the desired size. In this case we | |
| 1720 // need to shrink the committed space accordingly. | |
| 1721 assert(mr.end() < new_end, "invariant"); | |
| 1722 | |
| 1723 size_t diff_bytes = aligned_expand_bytes - actual_expand_bytes; | |
| 1724 // First uncommit the memory. | |
| 1725 _g1_storage.shrink_by(diff_bytes); | |
| 1726 // Then propagate this update to the necessary data structures. | |
| 1727 update_committed_space(new_end, mr.end()); | |
|
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1728 } |
| 3766 | 1729 _free_list.add_as_tail(&expansion_list); |
|
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1730 |
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1731 if (_hr_printer.is_active()) { |
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1732 HeapWord* curr = mr.start(); |
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1733 while (curr < mr.end()) { |
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1734 HeapWord* curr_end = curr + HeapRegion::GrainWords; |
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1735 _hr_printer.commit(curr, curr_end); |
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1736 curr = curr_end; |
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1737 } |
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1738 assert(curr == mr.end(), "post-condition"); |
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1739 } |
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1740 g1_policy()->record_new_heap_size(n_regions()); |
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1741 } else { |
|
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1742 ergo_verbose0(ErgoHeapSizing, |
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1743 "did not expand the heap", |
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1744 ergo_format_reason("heap expansion operation failed")); |
|
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1745 // The expansion of the virtual storage space was unsuccessful. |
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1746 // Let's see if it was because we ran out of swap. |
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1747 if (G1ExitOnExpansionFailure && |
|
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1748 _g1_storage.uncommitted_size() >= aligned_expand_bytes) { |
|
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1749 // We had head room... |
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1750 vm_exit_out_of_memory(aligned_expand_bytes, "G1 heap expansion"); |
| 342 | 1751 } |
| 1752 } | |
|
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1753 return successful; |
| 342 | 1754 } |
| 1755 | |
| 3766 | 1756 void G1CollectedHeap::shrink_helper(size_t shrink_bytes) { |
| 342 | 1757 size_t old_mem_size = _g1_storage.committed_size(); |
| 1758 size_t aligned_shrink_bytes = | |
| 1759 ReservedSpace::page_align_size_down(shrink_bytes); | |
| 1760 aligned_shrink_bytes = align_size_down(aligned_shrink_bytes, | |
| 1761 HeapRegion::GrainBytes); | |
| 1762 size_t num_regions_deleted = 0; | |
| 3766 | 1763 MemRegion mr = _hrs.shrink_by(aligned_shrink_bytes, &num_regions_deleted); |
| 1764 HeapWord* old_end = (HeapWord*) _g1_storage.high(); | |
| 1765 assert(mr.end() == old_end, "post-condition"); | |
|
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1766 |
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1767 ergo_verbose3(ErgoHeapSizing, |
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1768 "shrink the heap", |
|
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1769 ergo_format_byte("requested shrinking amount") |
|
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1770 ergo_format_byte("aligned shrinking amount") |
|
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1771 ergo_format_byte("attempted shrinking amount"), |
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1772 shrink_bytes, aligned_shrink_bytes, mr.byte_size()); |
| 3766 | 1773 if (mr.byte_size() > 0) { |
|
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1774 if (_hr_printer.is_active()) { |
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1775 HeapWord* curr = mr.end(); |
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1776 while (curr > mr.start()) { |
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1777 HeapWord* curr_end = curr; |
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1778 curr -= HeapRegion::GrainWords; |
|
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1779 _hr_printer.uncommit(curr, curr_end); |
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1780 } |
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1781 assert(curr == mr.start(), "post-condition"); |
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1782 } |
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1783 |
| 342 | 1784 _g1_storage.shrink_by(mr.byte_size()); |
| 3766 | 1785 HeapWord* new_end = (HeapWord*) _g1_storage.high(); |
| 1786 assert(mr.start() == new_end, "post-condition"); | |
| 1787 | |
| 1788 _expansion_regions += num_regions_deleted; | |
| 1789 update_committed_space(old_end, new_end); | |
| 1790 HeapRegionRemSet::shrink_heap(n_regions()); | |
|
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1791 g1_policy()->record_new_heap_size(n_regions()); |
|
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1792 } else { |
|
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1793 ergo_verbose0(ErgoHeapSizing, |
|
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1794 "did not shrink the heap", |
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1795 ergo_format_reason("heap shrinking operation failed")); |
| 342 | 1796 } |
| 1797 } | |
| 1798 | |
| 1799 void G1CollectedHeap::shrink(size_t shrink_bytes) { | |
| 2152 | 1800 verify_region_sets_optional(); |
| 1801 | |
|
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1802 // We should only reach here at the end of a Full GC which means we |
|
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1803 // should not not be holding to any GC alloc regions. The method |
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1804 // below will make sure of that and do any remaining clean up. |
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1805 abandon_gc_alloc_regions(); |
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1806 |
| 2152 | 1807 // Instead of tearing down / rebuilding the free lists here, we |
| 1808 // could instead use the remove_all_pending() method on free_list to | |
| 1809 // remove only the ones that we need to remove. | |
| 4072 | 1810 tear_down_region_sets(true /* free_list_only */); |
| 342 | 1811 shrink_helper(shrink_bytes); |
| 4072 | 1812 rebuild_region_sets(true /* free_list_only */); |
| 2152 | 1813 |
| 3766 | 1814 _hrs.verify_optional(); |
| 2152 | 1815 verify_region_sets_optional(); |
| 342 | 1816 } |
| 1817 | |
| 1818 // Public methods. | |
| 1819 | |
| 1820 #ifdef _MSC_VER // the use of 'this' below gets a warning, make it go away | |
| 1821 #pragma warning( disable:4355 ) // 'this' : used in base member initializer list | |
| 1822 #endif // _MSC_VER | |
| 1823 | |
| 1824 | |
| 1825 G1CollectedHeap::G1CollectedHeap(G1CollectorPolicy* policy_) : | |
| 1826 SharedHeap(policy_), | |
| 1827 _g1_policy(policy_), | |
| 1111 | 1828 _dirty_card_queue_set(false), |
| 1705 | 1829 _into_cset_dirty_card_queue_set(false), |
|
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1830 _is_alive_closure_cm(this), |
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1831 _is_alive_closure_stw(this), |
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1832 _ref_processor_cm(NULL), |
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1833 _ref_processor_stw(NULL), |
| 342 | 1834 _process_strong_tasks(new SubTasksDone(G1H_PS_NumElements)), |
| 1835 _bot_shared(NULL), | |
| 1836 _objs_with_preserved_marks(NULL), _preserved_marks_of_objs(NULL), | |
| 1837 _evac_failure_scan_stack(NULL) , | |
| 1838 _mark_in_progress(false), | |
| 2152 | 1839 _cg1r(NULL), _summary_bytes_used(0), |
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1840 _g1mm(NULL), |
| 342 | 1841 _refine_cte_cl(NULL), |
| 1842 _full_collection(false), | |
| 2152 | 1843 _free_list("Master Free List"), |
| 1844 _secondary_free_list("Secondary Free List"), | |
| 4072 | 1845 _old_set("Old Set"), |
| 2152 | 1846 _humongous_set("Master Humongous Set"), |
| 1847 _free_regions_coming(false), | |
| 342 | 1848 _young_list(new YoungList(this)), |
| 1849 _gc_time_stamp(0), | |
|
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1850 _retained_old_gc_alloc_region(NULL), |
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1851 _expand_heap_after_alloc_failure(true), |
| 526 | 1852 _surviving_young_words(NULL), |
|
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1853 _full_collections_completed(0), |
| 526 | 1854 _in_cset_fast_test(NULL), |
|
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1855 _in_cset_fast_test_base(NULL), |
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1856 _dirty_cards_region_list(NULL), |
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1857 _worker_cset_start_region(NULL), |
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1858 _worker_cset_start_region_time_stamp(NULL) { |
| 342 | 1859 _g1h = this; // To catch bugs. |
| 1860 if (_process_strong_tasks == NULL || !_process_strong_tasks->valid()) { | |
| 1861 vm_exit_during_initialization("Failed necessary allocation."); | |
| 1862 } | |
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1863 |
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1864 _humongous_object_threshold_in_words = HeapRegion::GrainWords / 2; |
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1865 |
| 342 | 1866 int n_queues = MAX2((int)ParallelGCThreads, 1); |
| 1867 _task_queues = new RefToScanQueueSet(n_queues); | |
| 1868 | |
| 1869 int n_rem_sets = HeapRegionRemSet::num_par_rem_sets(); | |
| 1870 assert(n_rem_sets > 0, "Invariant."); | |
| 1871 | |
| 1872 HeapRegionRemSetIterator** iter_arr = | |
| 1873 NEW_C_HEAP_ARRAY(HeapRegionRemSetIterator*, n_queues); | |
| 1874 for (int i = 0; i < n_queues; i++) { | |
| 1875 iter_arr[i] = new HeapRegionRemSetIterator(); | |
| 1876 } | |
| 1877 _rem_set_iterator = iter_arr; | |
| 1878 | |
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1879 _worker_cset_start_region = NEW_C_HEAP_ARRAY(HeapRegion*, n_queues); |
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1880 _worker_cset_start_region_time_stamp = NEW_C_HEAP_ARRAY(unsigned int, n_queues); |
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1881 |
| 342 | 1882 for (int i = 0; i < n_queues; i++) { |
| 1883 RefToScanQueue* q = new RefToScanQueue(); | |
| 1884 q->initialize(); | |
| 1885 _task_queues->register_queue(i, q); | |
| 1886 } | |
| 1887 | |
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1888 clear_cset_start_regions(); |
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1889 |
| 342 | 1890 guarantee(_task_queues != NULL, "task_queues allocation failure."); |
| 1891 } | |
| 1892 | |
| 1893 jint G1CollectedHeap::initialize() { | |
| 1166 | 1894 CollectedHeap::pre_initialize(); |
| 342 | 1895 os::enable_vtime(); |
| 1896 | |
| 1897 // Necessary to satisfy locking discipline assertions. | |
| 1898 | |
| 1899 MutexLocker x(Heap_lock); | |
| 1900 | |
|
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1901 // We have to initialize the printer before committing the heap, as |
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1902 // it will be used then. |
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1903 _hr_printer.set_active(G1PrintHeapRegions); |
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1904 |
| 342 | 1905 // While there are no constraints in the GC code that HeapWordSize |
| 1906 // be any particular value, there are multiple other areas in the | |
| 1907 // system which believe this to be true (e.g. oop->object_size in some | |
| 1908 // cases incorrectly returns the size in wordSize units rather than | |
| 1909 // HeapWordSize). | |
| 1910 guarantee(HeapWordSize == wordSize, "HeapWordSize must equal wordSize"); | |
| 1911 | |
| 1912 size_t init_byte_size = collector_policy()->initial_heap_byte_size(); | |
| 1913 size_t max_byte_size = collector_policy()->max_heap_byte_size(); | |
| 1914 | |
| 1915 // Ensure that the sizes are properly aligned. | |
| 1916 Universe::check_alignment(init_byte_size, HeapRegion::GrainBytes, "g1 heap"); | |
| 1917 Universe::check_alignment(max_byte_size, HeapRegion::GrainBytes, "g1 heap"); | |
| 1918 | |
| 1919 _cg1r = new ConcurrentG1Refine(); | |
| 1920 | |
| 1921 // Reserve the maximum. | |
| 1922 PermanentGenerationSpec* pgs = collector_policy()->permanent_generation(); | |
| 1923 // Includes the perm-gen. | |
|
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1924 |
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1925 // When compressed oops are enabled, the preferred heap base |
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1926 // is calculated by subtracting the requested size from the |
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1927 // 32Gb boundary and using the result as the base address for |
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1928 // heap reservation. If the requested size is not aligned to |
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1929 // HeapRegion::GrainBytes (i.e. the alignment that is passed |
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1930 // into the ReservedHeapSpace constructor) then the actual |
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1931 // base of the reserved heap may end up differing from the |
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1932 // address that was requested (i.e. the preferred heap base). |
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1933 // If this happens then we could end up using a non-optimal |
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1934 // compressed oops mode. |
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1935 |
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1936 // Since max_byte_size is aligned to the size of a heap region (checked |
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1937 // above), we also need to align the perm gen size as it might not be. |
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1938 const size_t total_reserved = max_byte_size + |
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1939 align_size_up(pgs->max_size(), HeapRegion::GrainBytes); |
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1940 Universe::check_alignment(total_reserved, HeapRegion::GrainBytes, "g1 heap and perm"); |
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1941 |
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1942 char* addr = Universe::preferred_heap_base(total_reserved, Universe::UnscaledNarrowOop); |
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1943 |
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1944 ReservedHeapSpace heap_rs(total_reserved, HeapRegion::GrainBytes, |
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1945 UseLargePages, addr); |
|
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1946 |
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1947 if (UseCompressedOops) { |
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1948 if (addr != NULL && !heap_rs.is_reserved()) { |
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1949 // Failed to reserve at specified address - the requested memory |
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1950 // region is taken already, for example, by 'java' launcher. |
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1951 // Try again to reserver heap higher. |
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1952 addr = Universe::preferred_heap_base(total_reserved, Universe::ZeroBasedNarrowOop); |
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1953 |
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1954 ReservedHeapSpace heap_rs0(total_reserved, HeapRegion::GrainBytes, |
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1955 UseLargePages, addr); |
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1956 |
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1957 if (addr != NULL && !heap_rs0.is_reserved()) { |
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1958 // Failed to reserve at specified address again - give up. |
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1959 addr = Universe::preferred_heap_base(total_reserved, Universe::HeapBasedNarrowOop); |
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1960 assert(addr == NULL, ""); |
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1961 |
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1962 ReservedHeapSpace heap_rs1(total_reserved, HeapRegion::GrainBytes, |
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1963 UseLargePages, addr); |
|
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1964 heap_rs = heap_rs1; |
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1965 } else { |
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1966 heap_rs = heap_rs0; |
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1967 } |
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1968 } |
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1969 } |
| 342 | 1970 |
| 1971 if (!heap_rs.is_reserved()) { | |
| 1972 vm_exit_during_initialization("Could not reserve enough space for object heap"); | |
| 1973 return JNI_ENOMEM; | |
| 1974 } | |
| 1975 | |
| 1976 // It is important to do this in a way such that concurrent readers can't | |
| 1977 // temporarily think somethings in the heap. (I've actually seen this | |
| 1978 // happen in asserts: DLD.) | |
| 1979 _reserved.set_word_size(0); | |
| 1980 _reserved.set_start((HeapWord*)heap_rs.base()); | |
| 1981 _reserved.set_end((HeapWord*)(heap_rs.base() + heap_rs.size())); | |
| 1982 | |
| 1983 _expansion_regions = max_byte_size/HeapRegion::GrainBytes; | |
| 1984 | |
| 1985 // Create the gen rem set (and barrier set) for the entire reserved region. | |
| 1986 _rem_set = collector_policy()->create_rem_set(_reserved, 2); | |
| 1987 set_barrier_set(rem_set()->bs()); | |
| 1988 if (barrier_set()->is_a(BarrierSet::ModRef)) { | |
| 1989 _mr_bs = (ModRefBarrierSet*)_barrier_set; | |
| 1990 } else { | |
| 1991 vm_exit_during_initialization("G1 requires a mod ref bs."); | |
| 1992 return JNI_ENOMEM; | |
| 1993 } | |
| 1994 | |
| 1995 // Also create a G1 rem set. | |
| 1861 | 1996 if (mr_bs()->is_a(BarrierSet::CardTableModRef)) { |
| 1997 _g1_rem_set = new G1RemSet(this, (CardTableModRefBS*)mr_bs()); | |
| 342 | 1998 } else { |
| 1861 | 1999 vm_exit_during_initialization("G1 requires a cardtable mod ref bs."); |
| 2000 return JNI_ENOMEM; | |
| 342 | 2001 } |
| 2002 | |
| 2003 // Carve out the G1 part of the heap. | |
| 2004 | |
| 2005 ReservedSpace g1_rs = heap_rs.first_part(max_byte_size); | |
| 2006 _g1_reserved = MemRegion((HeapWord*)g1_rs.base(), | |
| 2007 g1_rs.size()/HeapWordSize); | |
| 2008 ReservedSpace perm_gen_rs = heap_rs.last_part(max_byte_size); | |
| 2009 | |
| 2010 _perm_gen = pgs->init(perm_gen_rs, pgs->init_size(), rem_set()); | |
| 2011 | |
| 2012 _g1_storage.initialize(g1_rs, 0); | |
| 2013 _g1_committed = MemRegion((HeapWord*)_g1_storage.low(), (size_t) 0); | |
| 3766 | 2014 _hrs.initialize((HeapWord*) _g1_reserved.start(), |
| 2015 (HeapWord*) _g1_reserved.end(), | |
| 2016 _expansion_regions); | |
| 342 | 2017 |
|
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2018 // 6843694 - ensure that the maximum region index can fit |
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2019 // in the remembered set structures. |
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2020 const size_t max_region_idx = ((size_t)1 << (sizeof(RegionIdx_t)*BitsPerByte-1)) - 1; |
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2021 guarantee((max_regions() - 1) <= max_region_idx, "too many regions"); |
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2022 |
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2023 size_t max_cards_per_region = ((size_t)1 << (sizeof(CardIdx_t)*BitsPerByte-1)) - 1; |
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2024 guarantee(HeapRegion::CardsPerRegion > 0, "make sure it's initialized"); |
|
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2025 guarantee(HeapRegion::CardsPerRegion < max_cards_per_region, |
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2026 "too many cards per region"); |
|
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2027 |
| 2152 | 2028 HeapRegionSet::set_unrealistically_long_length(max_regions() + 1); |
| 2029 | |
| 342 | 2030 _bot_shared = new G1BlockOffsetSharedArray(_reserved, |
| 2031 heap_word_size(init_byte_size)); | |
| 2032 | |
| 2033 _g1h = this; | |
| 2034 | |
|
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2035 _in_cset_fast_test_length = max_regions(); |
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|
2036 _in_cset_fast_test_base = NEW_C_HEAP_ARRAY(bool, _in_cset_fast_test_length); |
|
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
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parents:
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diff
changeset
|
2037 |
|
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
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parents:
1391
diff
changeset
|
2038 // We're biasing _in_cset_fast_test to avoid subtracting the |
|
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
2039 // beginning of the heap every time we want to index; basically |
|
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
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parents:
1391
diff
changeset
|
2040 // it's the same with what we do with the card table. |
|
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
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parents:
1391
diff
changeset
|
2041 _in_cset_fast_test = _in_cset_fast_test_base - |
|
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
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parents:
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diff
changeset
|
2042 ((size_t) _g1_reserved.start() >> HeapRegion::LogOfHRGrainBytes); |
|
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
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parents:
1391
diff
changeset
|
2043 |
|
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
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parents:
1391
diff
changeset
|
2044 // Clear the _cset_fast_test bitmap in anticipation of adding |
|
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
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parents:
1391
diff
changeset
|
2045 // regions to the incremental collection set for the first |
|
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
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parents:
1391
diff
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|
2046 // evacuation pause. |
|
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
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parents:
1391
diff
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|
2047 clear_cset_fast_test(); |
|
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diff
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|
2048 |
| 342 | 2049 // Create the ConcurrentMark data structure and thread. |
| 2050 // (Must do this late, so that "max_regions" is defined.) | |
| 2051 _cm = new ConcurrentMark(heap_rs, (int) max_regions()); | |
| 2052 _cmThread = _cm->cmThread(); | |
| 2053 | |
| 2054 // Initialize the from_card cache structure of HeapRegionRemSet. | |
| 2055 HeapRegionRemSet::init_heap(max_regions()); | |
| 2056 | |
| 677 | 2057 // Now expand into the initial heap size. |
|
2188
c33825b68624
6923430: G1: assert(res != 0,"This should have worked.")
johnc
parents:
2173
diff
changeset
|
2058 if (!expand(init_byte_size)) { |
|
c33825b68624
6923430: G1: assert(res != 0,"This should have worked.")
johnc
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2173
diff
changeset
|
2059 vm_exit_during_initialization("Failed to allocate initial heap."); |
|
c33825b68624
6923430: G1: assert(res != 0,"This should have worked.")
johnc
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2173
diff
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|
2060 return JNI_ENOMEM; |
|
c33825b68624
6923430: G1: assert(res != 0,"This should have worked.")
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2173
diff
changeset
|
2061 } |
| 342 | 2062 |
| 2063 // Perform any initialization actions delegated to the policy. | |
| 2064 g1_policy()->init(); | |
| 2065 | |
| 2066 _refine_cte_cl = | |
| 2067 new RefineCardTableEntryClosure(ConcurrentG1RefineThread::sts(), | |
| 2068 g1_rem_set(), | |
| 2069 concurrent_g1_refine()); | |
| 2070 JavaThread::dirty_card_queue_set().set_closure(_refine_cte_cl); | |
| 2071 | |
| 2072 JavaThread::satb_mark_queue_set().initialize(SATB_Q_CBL_mon, | |
| 2073 SATB_Q_FL_lock, | |
| 1111 | 2074 G1SATBProcessCompletedThreshold, |
| 342 | 2075 Shared_SATB_Q_lock); |
| 794 | 2076 |
| 2077 JavaThread::dirty_card_queue_set().initialize(DirtyCardQ_CBL_mon, | |
| 2078 DirtyCardQ_FL_lock, | |
| 1111 | 2079 concurrent_g1_refine()->yellow_zone(), |
| 2080 concurrent_g1_refine()->red_zone(), | |
| 794 | 2081 Shared_DirtyCardQ_lock); |
| 2082 | |
|
616
4f360ec815ba
6720309: G1: don't synchronously update RSet during evacuation pauses
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parents:
595
diff
changeset
|
2083 if (G1DeferredRSUpdate) { |
|
4f360ec815ba
6720309: G1: don't synchronously update RSet during evacuation pauses
iveresov
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595
diff
changeset
|
2084 dirty_card_queue_set().initialize(DirtyCardQ_CBL_mon, |
|
4f360ec815ba
6720309: G1: don't synchronously update RSet during evacuation pauses
iveresov
parents:
595
diff
changeset
|
2085 DirtyCardQ_FL_lock, |
| 1111 | 2086 -1, // never trigger processing |
| 2087 -1, // no limit on length | |
|
616
4f360ec815ba
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iveresov
parents:
595
diff
changeset
|
2088 Shared_DirtyCardQ_lock, |
|
4f360ec815ba
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iveresov
parents:
595
diff
changeset
|
2089 &JavaThread::dirty_card_queue_set()); |
|
4f360ec815ba
6720309: G1: don't synchronously update RSet during evacuation pauses
iveresov
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595
diff
changeset
|
2090 } |
| 1705 | 2091 |
| 2092 // Initialize the card queue set used to hold cards containing | |
| 2093 // references into the collection set. | |
| 2094 _into_cset_dirty_card_queue_set.initialize(DirtyCardQ_CBL_mon, | |
| 2095 DirtyCardQ_FL_lock, | |
| 2096 -1, // never trigger processing | |
| 2097 -1, // no limit on length | |
| 2098 Shared_DirtyCardQ_lock, | |
| 2099 &JavaThread::dirty_card_queue_set()); | |
| 2100 | |
| 342 | 2101 // In case we're keeping closure specialization stats, initialize those |
| 2102 // counts and that mechanism. | |
| 2103 SpecializationStats::clear(); | |
| 2104 | |
| 2105 // Do later initialization work for concurrent refinement. | |
| 2106 _cg1r->init(); | |
| 2107 | |
|
2433
abdfc822206f
7023069: G1: Introduce symmetric locking in the slow allocation path
tonyp
parents:
2432
diff
changeset
|
2108 // Here we allocate the dummy full region that is required by the |
|
abdfc822206f
7023069: G1: Introduce symmetric locking in the slow allocation path
tonyp
parents:
2432
diff
changeset
|
2109 // G1AllocRegion class. If we don't pass an address in the reserved |
|
abdfc822206f
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tonyp
parents:
2432
diff
changeset
|
2110 // space here, lots of asserts fire. |
| 3766 | 2111 |
| 2112 HeapRegion* dummy_region = new_heap_region(0 /* index of bottom region */, | |
| 2113 _g1_reserved.start()); | |
|
2433
abdfc822206f
7023069: G1: Introduce symmetric locking in the slow allocation path
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parents:
2432
diff
changeset
|
2114 // We'll re-use the same region whether the alloc region will |
|
abdfc822206f
7023069: G1: Introduce symmetric locking in the slow allocation path
tonyp
parents:
2432
diff
changeset
|
2115 // require BOT updates or not and, if it doesn't, then a non-young |
|
abdfc822206f
7023069: G1: Introduce symmetric locking in the slow allocation path
tonyp
parents:
2432
diff
changeset
|
2116 // region will complain that it cannot support allocations without |
|
abdfc822206f
7023069: G1: Introduce symmetric locking in the slow allocation path
tonyp
parents:
2432
diff
changeset
|
2117 // BOT updates. So we'll tag the dummy region as young to avoid that. |
|
abdfc822206f
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tonyp
parents:
2432
diff
changeset
|
2118 dummy_region->set_young(); |
|
abdfc822206f
7023069: G1: Introduce symmetric locking in the slow allocation path
tonyp
parents:
2432
diff
changeset
|
2119 // Make sure it's full. |
|
abdfc822206f
7023069: G1: Introduce symmetric locking in the slow allocation path
tonyp
parents:
2432
diff
changeset
|
2120 dummy_region->set_top(dummy_region->end()); |
|
abdfc822206f
7023069: G1: Introduce symmetric locking in the slow allocation path
tonyp
parents:
2432
diff
changeset
|
2121 G1AllocRegion::setup(this, dummy_region); |
|
abdfc822206f
7023069: G1: Introduce symmetric locking in the slow allocation path
tonyp
parents:
2432
diff
changeset
|
2122 |
|
abdfc822206f
7023069: G1: Introduce symmetric locking in the slow allocation path
tonyp
parents:
2432
diff
changeset
|
2123 init_mutator_alloc_region(); |
|
abdfc822206f
7023069: G1: Introduce symmetric locking in the slow allocation path
tonyp
parents:
2432
diff
changeset
|
2124 |
|
3289
b52782ae3880
6946417: G1: Java VisualVM does not support G1 properly.
jmasa
parents:
3285
diff
changeset
|
2125 // Do create of the monitoring and management support so that |
|
b52782ae3880
6946417: G1: Java VisualVM does not support G1 properly.
jmasa
parents:
3285
diff
changeset
|
2126 // values in the heap have been properly initialized. |
|
3980
8229bd737950
7075646: G1: fix inconsistencies in the monitoring data
tonyp
parents:
3979
diff
changeset
|
2127 _g1mm = new G1MonitoringSupport(this); |
|
3289
b52782ae3880
6946417: G1: Java VisualVM does not support G1 properly.
jmasa
parents:
3285
diff
changeset
|
2128 |
| 342 | 2129 return JNI_OK; |
| 2130 } | |
| 2131 | |
| 2132 void G1CollectedHeap::ref_processing_init() { | |
|
1974
fd1d227ef1b9
6983204: G1: Nightly test nsk/regression/b4958615 failing with +ExplicitGCInvokesConcurrent
johnc
parents:
1973
diff
changeset
|
2133 // Reference processing in G1 currently works as follows: |
|
fd1d227ef1b9
6983204: G1: Nightly test nsk/regression/b4958615 failing with +ExplicitGCInvokesConcurrent
johnc
parents:
1973
diff
changeset
|
2134 // |
|
3979
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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parents:
3973
diff
changeset
|
2135 // * There are two reference processor instances. One is |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
2136 // used to record and process discovered references |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
2137 // during concurrent marking; the other is used to |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
2138 // record and process references during STW pauses |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
2139 // (both full and incremental). |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
2140 // * Both ref processors need to 'span' the entire heap as |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
2141 // the regions in the collection set may be dotted around. |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
2142 // |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
2143 // * For the concurrent marking ref processor: |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
2144 // * Reference discovery is enabled at initial marking. |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
2145 // * Reference discovery is disabled and the discovered |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
2146 // references processed etc during remarking. |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
2147 // * Reference discovery is MT (see below). |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
2148 // * Reference discovery requires a barrier (see below). |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
2149 // * Reference processing may or may not be MT |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
2150 // (depending on the value of ParallelRefProcEnabled |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
2151 // and ParallelGCThreads). |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
2152 // * A full GC disables reference discovery by the CM |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
2153 // ref processor and abandons any entries on it's |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
2154 // discovered lists. |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
2155 // |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
2156 // * For the STW processor: |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
2157 // * Non MT discovery is enabled at the start of a full GC. |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
2158 // * Processing and enqueueing during a full GC is non-MT. |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
2159 // * During a full GC, references are processed after marking. |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
2160 // |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
2161 // * Discovery (may or may not be MT) is enabled at the start |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
2162 // of an incremental evacuation pause. |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
2163 // * References are processed near the end of a STW evacuation pause. |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
2164 // * For both types of GC: |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
2165 // * Discovery is atomic - i.e. not concurrent. |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
2166 // * Reference discovery will not need a barrier. |
|
1974
fd1d227ef1b9
6983204: G1: Nightly test nsk/regression/b4958615 failing with +ExplicitGCInvokesConcurrent
johnc
parents:
1973
diff
changeset
|
2167 |
| 342 | 2168 SharedHeap::ref_processing_init(); |
| 2169 MemRegion mr = reserved_region(); | |
|
3979
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
2170 |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
2171 // Concurrent Mark ref processor |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
2172 _ref_processor_cm = |
|
2369
92da084fefc9
6668573: CMS: reference processing crash if ParallelCMSThreads > ParallelGCThreads
ysr
parents:
2361
diff
changeset
|
2173 new ReferenceProcessor(mr, // span |
|
3979
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
2174 ParallelRefProcEnabled && (ParallelGCThreads > 1), |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
2175 // mt processing |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
2176 (int) ParallelGCThreads, |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
2177 // degree of mt processing |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
2178 (ParallelGCThreads > 1) || (ConcGCThreads > 1), |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
2179 // mt discovery |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
2180 (int) MAX2(ParallelGCThreads, ConcGCThreads), |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
2181 // degree of mt discovery |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
2182 false, |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
2183 // Reference discovery is not atomic |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
2184 &_is_alive_closure_cm, |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
2185 // is alive closure |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
2186 // (for efficiency/performance) |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
2187 true); |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
2188 // Setting next fields of discovered |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
2189 // lists requires a barrier. |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
2190 |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
2191 // STW ref processor |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
2192 _ref_processor_stw = |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
2193 new ReferenceProcessor(mr, // span |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
2194 ParallelRefProcEnabled && (ParallelGCThreads > 1), |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
2195 // mt processing |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
2196 MAX2((int)ParallelGCThreads, 1), |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
2197 // degree of mt processing |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
2198 (ParallelGCThreads > 1), |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
2199 // mt discovery |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
2200 MAX2((int)ParallelGCThreads, 1), |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
2201 // degree of mt discovery |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
2202 true, |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
2203 // Reference discovery is atomic |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
2204 &_is_alive_closure_stw, |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
2205 // is alive closure |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
2206 // (for efficiency/performance) |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
2207 false); |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
2208 // Setting next fields of discovered |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
2209 // lists requires a barrier. |
| 342 | 2210 } |
| 2211 | |
| 2212 size_t G1CollectedHeap::capacity() const { | |
| 2213 return _g1_committed.byte_size(); | |
| 2214 } | |
| 2215 | |
| 1705 | 2216 void G1CollectedHeap::iterate_dirty_card_closure(CardTableEntryClosure* cl, |
| 2217 DirtyCardQueue* into_cset_dcq, | |
| 2218 bool concurrent, | |
| 342 | 2219 int worker_i) { |
| 889 | 2220 // Clean cards in the hot card cache |
| 1705 | 2221 concurrent_g1_refine()->clean_up_cache(worker_i, g1_rem_set(), into_cset_dcq); |
| 889 | 2222 |
| 342 | 2223 DirtyCardQueueSet& dcqs = JavaThread::dirty_card_queue_set(); |
| 2224 int n_completed_buffers = 0; | |
| 1705 | 2225 while (dcqs.apply_closure_to_completed_buffer(cl, worker_i, 0, true)) { |
| 342 | 2226 n_completed_buffers++; |
| 2227 } | |
| 2228 g1_policy()->record_update_rs_processed_buffers(worker_i, | |
| 2229 (double) n_completed_buffers); | |
| 2230 dcqs.clear_n_completed_buffers(); | |
| 2231 assert(!dcqs.completed_buffers_exist_dirty(), "Completed buffers exist!"); | |
| 2232 } | |
| 2233 | |
| 2234 | |
| 2235 // Computes the sum of the storage used by the various regions. | |
| 2236 | |
| 2237 size_t G1CollectedHeap::used() const { | |
|
862
36b5611220a7
6863216: Clean up debugging debris inadvertently pushed with 6700789
ysr
parents:
861
diff
changeset
|
2238 assert(Heap_lock->owner() != NULL, |
|
36b5611220a7
6863216: Clean up debugging debris inadvertently pushed with 6700789
ysr
parents:
861
diff
changeset
|
2239 "Should be owned on this thread's behalf."); |
| 342 | 2240 size_t result = _summary_bytes_used; |
|
845
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
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parents:
838
diff
changeset
|
2241 // Read only once in case it is set to NULL concurrently |
|
2433
abdfc822206f
7023069: G1: Introduce symmetric locking in the slow allocation path
tonyp
parents:
2432
diff
changeset
|
2242 HeapRegion* hr = _mutator_alloc_region.get(); |
|
845
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
ysr
parents:
838
diff
changeset
|
2243 if (hr != NULL) |
|
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
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parents:
838
diff
changeset
|
2244 result += hr->used(); |
| 342 | 2245 return result; |
| 2246 } | |
| 2247 | |
|
846
42d84bbbecf4
6859911: G1: assert(Heap_lock->owner() = NULL, "Should be owned on this thread's behalf")
tonyp
parents:
845
diff
changeset
|
2248 size_t G1CollectedHeap::used_unlocked() const { |
|
42d84bbbecf4
6859911: G1: assert(Heap_lock->owner() = NULL, "Should be owned on this thread's behalf")
tonyp
parents:
845
diff
changeset
|
2249 size_t result = _summary_bytes_used; |
|
42d84bbbecf4
6859911: G1: assert(Heap_lock->owner() = NULL, "Should be owned on this thread's behalf")
tonyp
parents:
845
diff
changeset
|
2250 return result; |
|
42d84bbbecf4
6859911: G1: assert(Heap_lock->owner() = NULL, "Should be owned on this thread's behalf")
tonyp
parents:
845
diff
changeset
|
2251 } |
|
42d84bbbecf4
6859911: G1: assert(Heap_lock->owner() = NULL, "Should be owned on this thread's behalf")
tonyp
parents:
845
diff
changeset
|
2252 |
| 342 | 2253 class SumUsedClosure: public HeapRegionClosure { |
| 2254 size_t _used; | |
| 2255 public: | |
| 2256 SumUsedClosure() : _used(0) {} | |
| 2257 bool doHeapRegion(HeapRegion* r) { | |
| 2258 if (!r->continuesHumongous()) { | |
| 2259 _used += r->used(); | |
| 2260 } | |
| 2261 return false; | |
| 2262 } | |
| 2263 size_t result() { return _used; } | |
| 2264 }; | |
| 2265 | |
| 2266 size_t G1CollectedHeap::recalculate_used() const { | |
| 2267 SumUsedClosure blk; | |
| 3766 | 2268 heap_region_iterate(&blk); |
| 342 | 2269 return blk.result(); |
| 2270 } | |
| 2271 | |
| 2272 size_t G1CollectedHeap::unsafe_max_alloc() { | |
| 2152 | 2273 if (free_regions() > 0) return HeapRegion::GrainBytes; |
| 342 | 2274 // otherwise, is there space in the current allocation region? |
| 2275 | |
| 2276 // We need to store the current allocation region in a local variable | |
| 2277 // here. The problem is that this method doesn't take any locks and | |
| 2278 // there may be other threads which overwrite the current allocation | |
| 2279 // region field. attempt_allocation(), for example, sets it to NULL | |
| 2280 // and this can happen *after* the NULL check here but before the call | |
| 2281 // to free(), resulting in a SIGSEGV. Note that this doesn't appear | |
| 2282 // to be a problem in the optimized build, since the two loads of the | |
| 2283 // current allocation region field are optimized away. | |
|
2433
abdfc822206f
7023069: G1: Introduce symmetric locking in the slow allocation path
tonyp
parents:
2432
diff
changeset
|
2284 HeapRegion* hr = _mutator_alloc_region.get(); |
|
abdfc822206f
7023069: G1: Introduce symmetric locking in the slow allocation path
tonyp
parents:
2432
diff
changeset
|
2285 if (hr == NULL) { |
| 342 | 2286 return 0; |
| 2287 } | |
|
2433
abdfc822206f
7023069: G1: Introduce symmetric locking in the slow allocation path
tonyp
parents:
2432
diff
changeset
|
2288 return hr->free(); |
| 342 | 2289 } |
| 2290 | |
|
1656
4e5661ba9d98
6944166: G1: explicit GCs are not always handled correctly
tonyp
parents:
1611
diff
changeset
|
2291 bool G1CollectedHeap::should_do_concurrent_full_gc(GCCause::Cause cause) { |
|
4e5661ba9d98
6944166: G1: explicit GCs are not always handled correctly
tonyp
parents:
1611
diff
changeset
|
2292 return |
|
4e5661ba9d98
6944166: G1: explicit GCs are not always handled correctly
tonyp
parents:
1611
diff
changeset
|
2293 ((cause == GCCause::_gc_locker && GCLockerInvokesConcurrent) || |
|
4e5661ba9d98
6944166: G1: explicit GCs are not always handled correctly
tonyp
parents:
1611
diff
changeset
|
2294 (cause == GCCause::_java_lang_system_gc && ExplicitGCInvokesConcurrent)); |
|
4e5661ba9d98
6944166: G1: explicit GCs are not always handled correctly
tonyp
parents:
1611
diff
changeset
|
2295 } |
|
4e5661ba9d98
6944166: G1: explicit GCs are not always handled correctly
tonyp
parents:
1611
diff
changeset
|
2296 |
|
3285
49a67202bc67
7011855: G1: non-product flag to artificially grow the heap
tonyp
parents:
2433
diff
changeset
|
2297 #ifndef PRODUCT |
|
49a67202bc67
7011855: G1: non-product flag to artificially grow the heap
tonyp
parents:
2433
diff
changeset
|
2298 void G1CollectedHeap::allocate_dummy_regions() { |
|
49a67202bc67
7011855: G1: non-product flag to artificially grow the heap
tonyp
parents:
2433
diff
changeset
|
2299 // Let's fill up most of the region |
|
49a67202bc67
7011855: G1: non-product flag to artificially grow the heap
tonyp
parents:
2433
diff
changeset
|
2300 size_t word_size = HeapRegion::GrainWords - 1024; |
|
49a67202bc67
7011855: G1: non-product flag to artificially grow the heap
tonyp
parents:
2433
diff
changeset
|
2301 // 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
|
2302 guarantee(isHumongous(word_size), "sanity"); |
|
49a67202bc67
7011855: G1: non-product flag to artificially grow the heap
tonyp
parents:
2433
diff
changeset
|
2303 |
|
49a67202bc67
7011855: G1: non-product flag to artificially grow the heap
tonyp
parents:
2433
diff
changeset
|
2304 for (uintx i = 0; i < G1DummyRegionsPerGC; ++i) { |
|
49a67202bc67
7011855: G1: non-product flag to artificially grow the heap
tonyp
parents:
2433
diff
changeset
|
2305 // 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
|
2306 HeapWord* dummy_obj = humongous_obj_allocate(word_size); |
|
49a67202bc67
7011855: G1: non-product flag to artificially grow the heap
tonyp
parents:
2433
diff
changeset
|
2307 if (dummy_obj != NULL) { |
|
49a67202bc67
7011855: G1: non-product flag to artificially grow the heap
tonyp
parents:
2433
diff
changeset
|
2308 MemRegion mr(dummy_obj, word_size); |
|
49a67202bc67
7011855: G1: non-product flag to artificially grow the heap
tonyp
parents:
2433
diff
changeset
|
2309 CollectedHeap::fill_with_object(mr); |
|
49a67202bc67
7011855: G1: non-product flag to artificially grow the heap
tonyp
parents:
2433
diff
changeset
|
2310 } else { |
|
49a67202bc67
7011855: G1: non-product flag to artificially grow the heap
tonyp
parents:
2433
diff
changeset
|
2311 // 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
|
2312 // again. Let's get out of the loop. |
|
49a67202bc67
7011855: G1: non-product flag to artificially grow the heap
tonyp
parents:
2433
diff
changeset
|
2313 break; |
|
49a67202bc67
7011855: G1: non-product flag to artificially grow the heap
tonyp
parents:
2433
diff
changeset
|
2314 } |
|
49a67202bc67
7011855: G1: non-product flag to artificially grow the heap
tonyp
parents:
2433
diff
changeset
|
2315 } |
|
49a67202bc67
7011855: G1: non-product flag to artificially grow the heap
tonyp
parents:
2433
diff
changeset
|
2316 } |
|
49a67202bc67
7011855: G1: non-product flag to artificially grow the heap
tonyp
parents:
2433
diff
changeset
|
2317 #endif // !PRODUCT |
|
49a67202bc67
7011855: G1: non-product flag to artificially grow the heap
tonyp
parents:
2433
diff
changeset
|
2318 |
|
2030
fb712ff22571
7000559: G1: assertion failure !outer || (full_collections_started == _full_collections_completed + 1)
tonyp
parents:
1995
diff
changeset
|
2319 void G1CollectedHeap::increment_full_collections_completed(bool concurrent) { |
|
1656
4e5661ba9d98
6944166: G1: explicit GCs are not always handled correctly
tonyp
parents:
1611
diff
changeset
|
2320 MonitorLockerEx x(FullGCCount_lock, Mutex::_no_safepoint_check_flag); |
|
4e5661ba9d98
6944166: G1: explicit GCs are not always handled correctly
tonyp
parents:
1611
diff
changeset
|
2321 |
|
2030
fb712ff22571
7000559: G1: assertion failure !outer || (full_collections_started == _full_collections_completed + 1)
tonyp
parents:
1995
diff
changeset
|
2322 // 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
|
2323 // 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
|
2324 // 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
|
2325 // assert here. |
|
fb712ff22571
7000559: G1: assertion failure !outer || (full_collections_started == _full_collections_completed + 1)
tonyp
parents:
1995
diff
changeset
|
2326 |
|
1656
4e5661ba9d98
6944166: G1: explicit GCs are not always handled correctly
tonyp
parents:
1611
diff
changeset
|
2327 // We have already incremented _total_full_collections at the start |
|
4e5661ba9d98
6944166: G1: explicit GCs are not always handled correctly
tonyp
parents:
1611
diff
changeset
|
2328 // of the GC, so total_full_collections() represents how many full |
|
4e5661ba9d98
6944166: G1: explicit GCs are not always handled correctly
tonyp
parents:
1611
diff
changeset
|
2329 // collections have been started. |
|
4e5661ba9d98
6944166: G1: explicit GCs are not always handled correctly
tonyp
parents:
1611
diff
changeset
|
2330 unsigned int full_collections_started = total_full_collections(); |
|
4e5661ba9d98
6944166: G1: explicit GCs are not always handled correctly
tonyp
parents:
1611
diff
changeset
|
2331 |
|
4e5661ba9d98
6944166: G1: explicit GCs are not always handled correctly
tonyp
parents:
1611
diff
changeset
|
2332 // 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
|
2333 // 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
|
2334 // interrupt a concurrent cycle), the number of full collections |
|
4e5661ba9d98
6944166: G1: explicit GCs are not always handled correctly
tonyp
parents:
1611
diff
changeset
|
2335 // 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
|
2336 // 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
|
2337 // behind the number of full collections started. |
|
4e5661ba9d98
6944166: G1: explicit GCs are not always handled correctly
tonyp
parents:
1611
diff
changeset
|
2338 |
|
4e5661ba9d98
6944166: G1: explicit GCs are not always handled correctly
tonyp
parents:
1611
diff
changeset
|
2339 // 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
|
2340 assert(concurrent || |
|
1656
4e5661ba9d98
6944166: G1: explicit GCs are not always handled correctly
tonyp
parents:
1611
diff
changeset
|
2341 (full_collections_started == _full_collections_completed + 1) || |
|
4e5661ba9d98
6944166: G1: explicit GCs are not always handled correctly
tonyp
parents:
1611
diff
changeset
|
2342 (full_collections_started == _full_collections_completed + 2), |
|
2030
fb712ff22571
7000559: G1: assertion failure !outer || (full_collections_started == _full_collections_completed + 1)
tonyp
parents:
1995
diff
changeset
|
2343 err_msg("for inner caller (Full GC): full_collections_started = %u " |
|
1656
4e5661ba9d98
6944166: G1: explicit GCs are not always handled correctly
tonyp
parents:
1611
diff
changeset
|
2344 "is inconsistent with _full_collections_completed = %u", |
|
4e5661ba9d98
6944166: G1: explicit GCs are not always handled correctly
tonyp
parents:
1611
diff
changeset
|
2345 full_collections_started, _full_collections_completed)); |
|
4e5661ba9d98
6944166: G1: explicit GCs are not always handled correctly
tonyp
parents:
1611
diff
changeset
|
2346 |
|
4e5661ba9d98
6944166: G1: explicit GCs are not always handled correctly
tonyp
parents:
1611
diff
changeset
|
2347 // 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
|
2348 assert(!concurrent || |
|
1656
4e5661ba9d98
6944166: G1: explicit GCs are not always handled correctly
tonyp
parents:
1611
diff
changeset
|
2349 (full_collections_started == _full_collections_completed + 1), |
|
2030
fb712ff22571
7000559: G1: assertion failure !outer || (full_collections_started == _full_collections_completed + 1)
tonyp
parents:
1995
diff
changeset
|
2350 err_msg("for outer caller (concurrent cycle): " |
|
fb712ff22571
7000559: G1: assertion failure !outer || (full_collections_started == _full_collections_completed + 1)
tonyp
parents:
1995
diff
changeset
|
2351 "full_collections_started = %u " |
|
1656
4e5661ba9d98
6944166: G1: explicit GCs are not always handled correctly
tonyp
parents:
1611
diff
changeset
|
2352 "is inconsistent with _full_collections_completed = %u", |
|
4e5661ba9d98
6944166: G1: explicit GCs are not always handled correctly
tonyp
parents:
1611
diff
changeset
|
2353 full_collections_started, _full_collections_completed)); |
|
4e5661ba9d98
6944166: G1: explicit GCs are not always handled correctly
tonyp
parents:
1611
diff
changeset
|
2354 |
|
4e5661ba9d98
6944166: G1: explicit GCs are not always handled correctly
tonyp
parents:
1611
diff
changeset
|
2355 _full_collections_completed += 1; |
|
4e5661ba9d98
6944166: G1: explicit GCs are not always handled correctly
tonyp
parents:
1611
diff
changeset
|
2356 |
|
1840
4e0094bc41fa
6983311: G1: LoopTest hangs when run with -XX:+ExplicitInvokesConcurrent
johnc
parents:
1833
diff
changeset
|
2357 // 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
|
2358 // we wake up any waiters (especially when ExplicitInvokesConcurrent |
|
4e0094bc41fa
6983311: G1: LoopTest hangs when run with -XX:+ExplicitInvokesConcurrent
johnc
parents:
1833
diff
changeset
|
2359 // 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
|
2360 // 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
|
2361 if (concurrent) { |
|
1840
4e0094bc41fa
6983311: G1: LoopTest hangs when run with -XX:+ExplicitInvokesConcurrent
johnc
parents:
1833
diff
changeset
|
2362 _cmThread->clear_in_progress(); |
|
4e0094bc41fa
6983311: G1: LoopTest hangs when run with -XX:+ExplicitInvokesConcurrent
johnc
parents:
1833
diff
changeset
|
2363 } |
|
4e0094bc41fa
6983311: G1: LoopTest hangs when run with -XX:+ExplicitInvokesConcurrent
johnc
parents:
1833
diff
changeset
|
2364 |
|
1656
4e5661ba9d98
6944166: G1: explicit GCs are not always handled correctly
tonyp
parents:
1611
diff
changeset
|
2365 // 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
|
2366 // System.gc() with (with ExplicitGCInvokesConcurrent set or not) |
|
4e5661ba9d98
6944166: G1: explicit GCs are not always handled correctly
tonyp
parents:
1611
diff
changeset
|
2367 // 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
|
2368 // waiting in VM_G1IncCollectionPause::doit_epilogue(). |
|
4e5661ba9d98
6944166: G1: explicit GCs are not always handled correctly
tonyp
parents:
1611
diff
changeset
|
2369 FullGCCount_lock->notify_all(); |
|
4e5661ba9d98
6944166: G1: explicit GCs are not always handled correctly
tonyp
parents:
1611
diff
changeset
|
2370 } |
|
4e5661ba9d98
6944166: G1: explicit GCs are not always handled correctly
tonyp
parents:
1611
diff
changeset
|
2371 |
| 342 | 2372 void G1CollectedHeap::collect_as_vm_thread(GCCause::Cause cause) { |
| 2152 | 2373 assert_at_safepoint(true /* should_be_vm_thread */); |
| 342 | 2374 GCCauseSetter gcs(this, cause); |
| 2375 switch (cause) { | |
| 2376 case GCCause::_heap_inspection: | |
| 2377 case GCCause::_heap_dump: { | |
| 2378 HandleMark hm; | |
| 2379 do_full_collection(false); // don't clear all soft refs | |
| 2380 break; | |
| 2381 } | |
| 2382 default: // XXX FIX ME | |
| 2383 ShouldNotReachHere(); // Unexpected use of this function | |
| 2384 } | |
| 2385 } | |
| 2386 | |
|
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2387 void G1CollectedHeap::collect(GCCause::Cause cause) { |
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2388 // The caller doesn't have the Heap_lock |
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2389 assert(!Heap_lock->owned_by_self(), "this thread should not own the Heap_lock"); |
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2390 |
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2391 unsigned int gc_count_before; |
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2392 unsigned int full_gc_count_before; |
| 342 | 2393 { |
|
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2394 MutexLocker ml(Heap_lock); |
| 1973 | 2395 |
|
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2396 // Read the GC count while holding the Heap_lock |
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2397 gc_count_before = SharedHeap::heap()->total_collections(); |
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2398 full_gc_count_before = SharedHeap::heap()->total_full_collections(); |
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2399 } |
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2400 |
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2401 if (should_do_concurrent_full_gc(cause)) { |
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2402 // Schedule an initial-mark evacuation pause that will start a |
| 1973 | 2403 // concurrent cycle. We're setting word_size to 0 which means that |
| 2404 // we are not requesting a post-GC allocation. | |
|
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2405 VM_G1IncCollectionPause op(gc_count_before, |
| 1973 | 2406 0, /* word_size */ |
| 2407 true, /* should_initiate_conc_mark */ | |
|
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2408 g1_policy()->max_pause_time_ms(), |
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2409 cause); |
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2410 VMThread::execute(&op); |
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2411 } else { |
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2412 if (cause == GCCause::_gc_locker |
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2413 DEBUG_ONLY(|| cause == GCCause::_scavenge_alot)) { |
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2414 |
| 1973 | 2415 // Schedule a standard evacuation pause. We're setting word_size |
| 2416 // to 0 which means that we are not requesting a post-GC allocation. | |
|
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2417 VM_G1IncCollectionPause op(gc_count_before, |
| 1973 | 2418 0, /* word_size */ |
|
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2419 false, /* should_initiate_conc_mark */ |
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2420 g1_policy()->max_pause_time_ms(), |
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2421 cause); |
|
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2422 VMThread::execute(&op); |
|
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2423 } else { |
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2424 // Schedule a Full GC. |
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2425 VM_G1CollectFull op(gc_count_before, full_gc_count_before, cause); |
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2426 VMThread::execute(&op); |
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|
2427 } |
| 342 | 2428 } |
| 2429 } | |
| 2430 | |
| 2431 bool G1CollectedHeap::is_in(const void* p) const { | |
| 4708 | 2432 if (_g1_committed.contains(p)) { |
| 2433 // Given that we know that p is in the committed space, | |
| 2434 // heap_region_containing_raw() should successfully | |
| 2435 // return the containing region. | |
| 2436 HeapRegion* hr = heap_region_containing_raw(p); | |
| 342 | 2437 return hr->is_in(p); |
| 2438 } else { | |
| 2439 return _perm_gen->as_gen()->is_in(p); | |
| 2440 } | |
| 2441 } | |
| 2442 | |
| 2443 // Iteration functions. | |
| 2444 | |
| 2445 // Iterates an OopClosure over all ref-containing fields of objects | |
| 2446 // within a HeapRegion. | |
| 2447 | |
| 2448 class IterateOopClosureRegionClosure: public HeapRegionClosure { | |
| 2449 MemRegion _mr; | |
| 2450 OopClosure* _cl; | |
| 2451 public: | |
| 2452 IterateOopClosureRegionClosure(MemRegion mr, OopClosure* cl) | |
| 2453 : _mr(mr), _cl(cl) {} | |
| 2454 bool doHeapRegion(HeapRegion* r) { | |
| 2455 if (! r->continuesHumongous()) { | |
| 2456 r->oop_iterate(_cl); | |
| 2457 } | |
| 2458 return false; | |
| 2459 } | |
| 2460 }; | |
| 2461 | |
| 678 | 2462 void G1CollectedHeap::oop_iterate(OopClosure* cl, bool do_perm) { |
| 342 | 2463 IterateOopClosureRegionClosure blk(_g1_committed, cl); |
| 3766 | 2464 heap_region_iterate(&blk); |
| 678 | 2465 if (do_perm) { |
| 2466 perm_gen()->oop_iterate(cl); | |
| 2467 } | |
| 342 | 2468 } |
| 2469 | |
| 678 | 2470 void G1CollectedHeap::oop_iterate(MemRegion mr, OopClosure* cl, bool do_perm) { |
| 342 | 2471 IterateOopClosureRegionClosure blk(mr, cl); |
| 3766 | 2472 heap_region_iterate(&blk); |
| 678 | 2473 if (do_perm) { |
| 2474 perm_gen()->oop_iterate(cl); | |
| 2475 } | |
| 342 | 2476 } |
| 2477 | |
| 2478 // Iterates an ObjectClosure over all objects within a HeapRegion. | |
| 2479 | |
| 2480 class IterateObjectClosureRegionClosure: public HeapRegionClosure { | |
| 2481 ObjectClosure* _cl; | |
| 2482 public: | |
| 2483 IterateObjectClosureRegionClosure(ObjectClosure* cl) : _cl(cl) {} | |
| 2484 bool doHeapRegion(HeapRegion* r) { | |
| 2485 if (! r->continuesHumongous()) { | |
| 2486 r->object_iterate(_cl); | |
| 2487 } | |
| 2488 return false; | |
| 2489 } | |
| 2490 }; | |
| 2491 | |
| 678 | 2492 void G1CollectedHeap::object_iterate(ObjectClosure* cl, bool do_perm) { |
| 342 | 2493 IterateObjectClosureRegionClosure blk(cl); |
| 3766 | 2494 heap_region_iterate(&blk); |
| 678 | 2495 if (do_perm) { |
| 2496 perm_gen()->object_iterate(cl); | |
| 2497 } | |
| 342 | 2498 } |
| 2499 | |
| 2500 void G1CollectedHeap::object_iterate_since_last_GC(ObjectClosure* cl) { | |
| 2501 // FIXME: is this right? | |
| 2502 guarantee(false, "object_iterate_since_last_GC not supported by G1 heap"); | |
| 2503 } | |
| 2504 | |
| 2505 // Calls a SpaceClosure on a HeapRegion. | |
| 2506 | |
| 2507 class SpaceClosureRegionClosure: public HeapRegionClosure { | |
| 2508 SpaceClosure* _cl; | |
| 2509 public: | |
| 2510 SpaceClosureRegionClosure(SpaceClosure* cl) : _cl(cl) {} | |
| 2511 bool doHeapRegion(HeapRegion* r) { | |
| 2512 _cl->do_space(r); | |
| 2513 return false; | |
| 2514 } | |
| 2515 }; | |
| 2516 | |
| 2517 void G1CollectedHeap::space_iterate(SpaceClosure* cl) { | |
| 2518 SpaceClosureRegionClosure blk(cl); | |
| 3766 | 2519 heap_region_iterate(&blk); |
| 342 | 2520 } |
| 2521 | |
| 3766 | 2522 void G1CollectedHeap::heap_region_iterate(HeapRegionClosure* cl) const { |
| 2523 _hrs.iterate(cl); | |
| 342 | 2524 } |
| 2525 | |
| 2526 void G1CollectedHeap::heap_region_iterate_from(HeapRegion* r, | |
| 3766 | 2527 HeapRegionClosure* cl) const { |
| 2528 _hrs.iterate_from(r, cl); | |
| 342 | 2529 } |
| 2530 | |
| 2531 void | |
| 2532 G1CollectedHeap::heap_region_par_iterate_chunked(HeapRegionClosure* cl, | |
|
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2533 uint worker, |
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2534 uint no_of_par_workers, |
| 342 | 2535 jint claim_value) { |
| 355 | 2536 const size_t regions = n_regions(); |
|
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2537 const uint max_workers = (G1CollectedHeap::use_parallel_gc_threads() ? |
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2538 no_of_par_workers : |
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2539 1); |
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2540 assert(UseDynamicNumberOfGCThreads || |
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2541 no_of_par_workers == workers()->total_workers(), |
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2542 "Non dynamic should use fixed number of workers"); |
| 355 | 2543 // try to spread out the starting points of the workers |
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2544 const size_t start_index = regions / max_workers * (size_t) worker; |
| 355 | 2545 |
| 2546 // each worker will actually look at all regions | |
| 2547 for (size_t count = 0; count < regions; ++count) { | |
| 2548 const size_t index = (start_index + count) % regions; | |
| 2549 assert(0 <= index && index < regions, "sanity"); | |
| 2550 HeapRegion* r = region_at(index); | |
| 2551 // we'll ignore "continues humongous" regions (we'll process them | |
| 2552 // when we come across their corresponding "start humongous" | |
| 2553 // region) and regions already claimed | |
| 2554 if (r->claim_value() == claim_value || r->continuesHumongous()) { | |
| 2555 continue; | |
| 2556 } | |
| 2557 // OK, try to claim it | |
| 342 | 2558 if (r->claimHeapRegion(claim_value)) { |
| 355 | 2559 // success! |
| 2560 assert(!r->continuesHumongous(), "sanity"); | |
| 2561 if (r->startsHumongous()) { | |
| 2562 // If the region is "starts humongous" we'll iterate over its | |
| 2563 // "continues humongous" first; in fact we'll do them | |
| 2564 // first. The order is important. In on case, calling the | |
| 2565 // closure on the "starts humongous" region might de-allocate | |
| 2566 // and clear all its "continues humongous" regions and, as a | |
| 2567 // result, we might end up processing them twice. So, we'll do | |
| 2568 // them first (notice: most closures will ignore them anyway) and | |
| 2569 // then we'll do the "starts humongous" region. | |
| 2570 for (size_t ch_index = index + 1; ch_index < regions; ++ch_index) { | |
| 2571 HeapRegion* chr = region_at(ch_index); | |
| 2572 | |
| 2573 // if the region has already been claimed or it's not | |
| 2574 // "continues humongous" we're done | |
| 2575 if (chr->claim_value() == claim_value || | |
| 2576 !chr->continuesHumongous()) { | |
| 2577 break; | |
| 2578 } | |
| 2579 | |
| 2580 // Noone should have claimed it directly. We can given | |
| 2581 // that we claimed its "starts humongous" region. | |
| 2582 assert(chr->claim_value() != claim_value, "sanity"); | |
| 2583 assert(chr->humongous_start_region() == r, "sanity"); | |
| 2584 | |
| 2585 if (chr->claimHeapRegion(claim_value)) { | |
| 2586 // we should always be able to claim it; noone else should | |
| 2587 // be trying to claim this region | |
| 2588 | |
| 2589 bool res2 = cl->doHeapRegion(chr); | |
| 2590 assert(!res2, "Should not abort"); | |
| 2591 | |
| 2592 // Right now, this holds (i.e., no closure that actually | |
| 2593 // does something with "continues humongous" regions | |
| 2594 // clears them). We might have to weaken it in the future, | |
| 2595 // but let's leave these two asserts here for extra safety. | |
| 2596 assert(chr->continuesHumongous(), "should still be the case"); | |
| 2597 assert(chr->humongous_start_region() == r, "sanity"); | |
| 2598 } else { | |
| 2599 guarantee(false, "we should not reach here"); | |
| 2600 } | |
| 2601 } | |
| 2602 } | |
| 2603 | |
| 2604 assert(!r->continuesHumongous(), "sanity"); | |
| 2605 bool res = cl->doHeapRegion(r); | |
| 2606 assert(!res, "Should not abort"); | |
| 2607 } | |
| 2608 } | |
| 2609 } | |
| 2610 | |
| 390 | 2611 class ResetClaimValuesClosure: public HeapRegionClosure { |
| 2612 public: | |
| 2613 bool doHeapRegion(HeapRegion* r) { | |
| 2614 r->set_claim_value(HeapRegion::InitialClaimValue); | |
| 2615 return false; | |
| 2616 } | |
| 2617 }; | |
| 2618 | |
|
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2619 void G1CollectedHeap::reset_heap_region_claim_values() { |
| 390 | 2620 ResetClaimValuesClosure blk; |
| 2621 heap_region_iterate(&blk); | |
| 2622 } | |
| 2623 | |
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2624 void G1CollectedHeap::reset_cset_heap_region_claim_values() { |
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2625 ResetClaimValuesClosure blk; |
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2626 collection_set_iterate(&blk); |
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2627 } |
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2628 |
| 355 | 2629 #ifdef ASSERT |
| 2630 // This checks whether all regions in the heap have the correct claim | |
| 2631 // value. I also piggy-backed on this a check to ensure that the | |
| 2632 // humongous_start_region() information on "continues humongous" | |
| 2633 // regions is correct. | |
| 2634 | |
| 2635 class CheckClaimValuesClosure : public HeapRegionClosure { | |
| 2636 private: | |
| 2637 jint _claim_value; | |
| 2638 size_t _failures; | |
| 2639 HeapRegion* _sh_region; | |
| 2640 public: | |
| 2641 CheckClaimValuesClosure(jint claim_value) : | |
| 2642 _claim_value(claim_value), _failures(0), _sh_region(NULL) { } | |
| 2643 bool doHeapRegion(HeapRegion* r) { | |
| 2644 if (r->claim_value() != _claim_value) { | |
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2645 gclog_or_tty->print_cr("Region " HR_FORMAT ", " |
| 355 | 2646 "claim value = %d, should be %d", |
|
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2647 HR_FORMAT_PARAMS(r), |
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2648 r->claim_value(), _claim_value); |
| 355 | 2649 ++_failures; |
| 2650 } | |
| 2651 if (!r->isHumongous()) { | |
| 2652 _sh_region = NULL; | |
| 2653 } else if (r->startsHumongous()) { | |
| 2654 _sh_region = r; | |
| 2655 } else if (r->continuesHumongous()) { | |
| 2656 if (r->humongous_start_region() != _sh_region) { | |
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2657 gclog_or_tty->print_cr("Region " HR_FORMAT ", " |
| 355 | 2658 "HS = "PTR_FORMAT", should be "PTR_FORMAT, |
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2659 HR_FORMAT_PARAMS(r), |
| 355 | 2660 r->humongous_start_region(), |
| 2661 _sh_region); | |
| 2662 ++_failures; | |
| 342 | 2663 } |
| 2664 } | |
| 355 | 2665 return false; |
| 2666 } | |
| 2667 size_t failures() { | |
| 2668 return _failures; | |
| 2669 } | |
| 2670 }; | |
| 2671 | |
| 2672 bool G1CollectedHeap::check_heap_region_claim_values(jint claim_value) { | |
| 2673 CheckClaimValuesClosure cl(claim_value); | |
| 2674 heap_region_iterate(&cl); | |
| 2675 return cl.failures() == 0; | |
| 2676 } | |
|
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2677 |
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2678 class CheckClaimValuesInCSetHRClosure: public HeapRegionClosure { |
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2679 jint _claim_value; |
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2680 size_t _failures; |
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2681 |
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2682 public: |
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|
2683 CheckClaimValuesInCSetHRClosure(jint claim_value) : |
|
dc467e8b2c5e
7112743: G1: Reduce overhead of marking closure during evacuation pauses
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|
2684 _claim_value(claim_value), |
|
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7112743: G1: Reduce overhead of marking closure during evacuation pauses
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|
2685 _failures(0) { } |
|
dc467e8b2c5e
7112743: G1: Reduce overhead of marking closure during evacuation pauses
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parents:
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diff
changeset
|
2686 |
|
dc467e8b2c5e
7112743: G1: Reduce overhead of marking closure during evacuation pauses
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parents:
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diff
changeset
|
2687 size_t failures() { |
|
dc467e8b2c5e
7112743: G1: Reduce overhead of marking closure during evacuation pauses
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parents:
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changeset
|
2688 return _failures; |
|
dc467e8b2c5e
7112743: G1: Reduce overhead of marking closure during evacuation pauses
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parents:
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diff
changeset
|
2689 } |
|
dc467e8b2c5e
7112743: G1: Reduce overhead of marking closure during evacuation pauses
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diff
changeset
|
2690 |
|
dc467e8b2c5e
7112743: G1: Reduce overhead of marking closure during evacuation pauses
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changeset
|
2691 bool doHeapRegion(HeapRegion* hr) { |
|
dc467e8b2c5e
7112743: G1: Reduce overhead of marking closure during evacuation pauses
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parents:
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diff
changeset
|
2692 assert(hr->in_collection_set(), "how?"); |
|
dc467e8b2c5e
7112743: G1: Reduce overhead of marking closure during evacuation pauses
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parents:
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changeset
|
2693 assert(!hr->isHumongous(), "H-region in CSet"); |
|
dc467e8b2c5e
7112743: G1: Reduce overhead of marking closure during evacuation pauses
johnc
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diff
changeset
|
2694 if (hr->claim_value() != _claim_value) { |
|
dc467e8b2c5e
7112743: G1: Reduce overhead of marking closure during evacuation pauses
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parents:
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changeset
|
2695 gclog_or_tty->print_cr("CSet Region " HR_FORMAT ", " |
|
dc467e8b2c5e
7112743: G1: Reduce overhead of marking closure during evacuation pauses
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parents:
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changeset
|
2696 "claim value = %d, should be %d", |
|
dc467e8b2c5e
7112743: G1: Reduce overhead of marking closure during evacuation pauses
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changeset
|
2697 HR_FORMAT_PARAMS(hr), |
|
dc467e8b2c5e
7112743: G1: Reduce overhead of marking closure during evacuation pauses
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changeset
|
2698 hr->claim_value(), _claim_value); |
|
dc467e8b2c5e
7112743: G1: Reduce overhead of marking closure during evacuation pauses
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changeset
|
2699 _failures += 1; |
|
dc467e8b2c5e
7112743: G1: Reduce overhead of marking closure during evacuation pauses
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parents:
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diff
changeset
|
2700 } |
|
dc467e8b2c5e
7112743: G1: Reduce overhead of marking closure during evacuation pauses
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diff
changeset
|
2701 return false; |
|
dc467e8b2c5e
7112743: G1: Reduce overhead of marking closure during evacuation pauses
johnc
parents:
4095
diff
changeset
|
2702 } |
|
dc467e8b2c5e
7112743: G1: Reduce overhead of marking closure during evacuation pauses
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parents:
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diff
changeset
|
2703 }; |
|
dc467e8b2c5e
7112743: G1: Reduce overhead of marking closure during evacuation pauses
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parents:
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changeset
|
2704 |
|
dc467e8b2c5e
7112743: G1: Reduce overhead of marking closure during evacuation pauses
johnc
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changeset
|
2705 bool G1CollectedHeap::check_cset_heap_region_claim_values(jint claim_value) { |
|
dc467e8b2c5e
7112743: G1: Reduce overhead of marking closure during evacuation pauses
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changeset
|
2706 CheckClaimValuesInCSetHRClosure cl(claim_value); |
|
dc467e8b2c5e
7112743: G1: Reduce overhead of marking closure during evacuation pauses
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changeset
|
2707 collection_set_iterate(&cl); |
|
dc467e8b2c5e
7112743: G1: Reduce overhead of marking closure during evacuation pauses
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parents:
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changeset
|
2708 return cl.failures() == 0; |
|
dc467e8b2c5e
7112743: G1: Reduce overhead of marking closure during evacuation pauses
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changeset
|
2709 } |
| 355 | 2710 #endif // ASSERT |
| 342 | 2711 |
|
4709
fd2b426c30db
7119908: G1: Cache CSet start region for each worker for subsequent reuse
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parents:
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diff
changeset
|
2712 // Clear the cached CSet starting regions and (more importantly) |
|
fd2b426c30db
7119908: G1: Cache CSet start region for each worker for subsequent reuse
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diff
changeset
|
2713 // the time stamps. Called when we reset the GC time stamp. |
|
fd2b426c30db
7119908: G1: Cache CSet start region for each worker for subsequent reuse
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parents:
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diff
changeset
|
2714 void G1CollectedHeap::clear_cset_start_regions() { |
|
fd2b426c30db
7119908: G1: Cache CSet start region for each worker for subsequent reuse
johnc
parents:
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diff
changeset
|
2715 assert(_worker_cset_start_region != NULL, "sanity"); |
|
fd2b426c30db
7119908: G1: Cache CSet start region for each worker for subsequent reuse
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parents:
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diff
changeset
|
2716 assert(_worker_cset_start_region_time_stamp != NULL, "sanity"); |
|
fd2b426c30db
7119908: G1: Cache CSet start region for each worker for subsequent reuse
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parents:
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diff
changeset
|
2717 |
|
fd2b426c30db
7119908: G1: Cache CSet start region for each worker for subsequent reuse
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parents:
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diff
changeset
|
2718 int n_queues = MAX2((int)ParallelGCThreads, 1); |
|
fd2b426c30db
7119908: G1: Cache CSet start region for each worker for subsequent reuse
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parents:
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diff
changeset
|
2719 for (int i = 0; i < n_queues; i++) { |
|
fd2b426c30db
7119908: G1: Cache CSet start region for each worker for subsequent reuse
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parents:
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diff
changeset
|
2720 _worker_cset_start_region[i] = NULL; |
|
fd2b426c30db
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parents:
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diff
changeset
|
2721 _worker_cset_start_region_time_stamp[i] = 0; |
|
fd2b426c30db
7119908: G1: Cache CSet start region for each worker for subsequent reuse
johnc
parents:
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diff
changeset
|
2722 } |
|
fd2b426c30db
7119908: G1: Cache CSet start region for each worker for subsequent reuse
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parents:
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diff
changeset
|
2723 } |
|
fd2b426c30db
7119908: G1: Cache CSet start region for each worker for subsequent reuse
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parents:
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diff
changeset
|
2724 |
|
fd2b426c30db
7119908: G1: Cache CSet start region for each worker for subsequent reuse
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parents:
4708
diff
changeset
|
2725 // Given the id of a worker, obtain or calculate a suitable |
|
fd2b426c30db
7119908: G1: Cache CSet start region for each worker for subsequent reuse
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parents:
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diff
changeset
|
2726 // starting region for iterating over the current collection set. |
|
4097
dc467e8b2c5e
7112743: G1: Reduce overhead of marking closure during evacuation pauses
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parents:
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changeset
|
2727 HeapRegion* G1CollectedHeap::start_cset_region_for_worker(int worker_i) { |
|
4709
fd2b426c30db
7119908: G1: Cache CSet start region for each worker for subsequent reuse
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parents:
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diff
changeset
|
2728 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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parents:
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diff
changeset
|
2729 |
|
fd2b426c30db
7119908: G1: Cache CSet start region for each worker for subsequent reuse
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parents:
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diff
changeset
|
2730 HeapRegion* result = NULL; |
|
fd2b426c30db
7119908: G1: Cache CSet start region for each worker for subsequent reuse
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parents:
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diff
changeset
|
2731 unsigned gc_time_stamp = get_gc_time_stamp(); |
|
fd2b426c30db
7119908: G1: Cache CSet start region for each worker for subsequent reuse
johnc
parents:
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diff
changeset
|
2732 |
|
fd2b426c30db
7119908: G1: Cache CSet start region for each worker for subsequent reuse
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parents:
4708
diff
changeset
|
2733 if (_worker_cset_start_region_time_stamp[worker_i] == gc_time_stamp) { |
|
fd2b426c30db
7119908: G1: Cache CSet start region for each worker for subsequent reuse
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parents:
4708
diff
changeset
|
2734 // Cached starting region for current worker was set |
|
fd2b426c30db
7119908: G1: Cache CSet start region for each worker for subsequent reuse
johnc
parents:
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diff
changeset
|
2735 // during the current pause - so it's valid. |
|
fd2b426c30db
7119908: G1: Cache CSet start region for each worker for subsequent reuse
johnc
parents:
4708
diff
changeset
|
2736 // Note: the cached starting heap region may be NULL |
|
fd2b426c30db
7119908: G1: Cache CSet start region for each worker for subsequent reuse
johnc
parents:
4708
diff
changeset
|
2737 // (when the collection set is empty). |
|
fd2b426c30db
7119908: G1: Cache CSet start region for each worker for subsequent reuse
johnc
parents:
4708
diff
changeset
|
2738 result = _worker_cset_start_region[worker_i]; |
|
fd2b426c30db
7119908: G1: Cache CSet start region for each worker for subsequent reuse
johnc
parents:
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diff
changeset
|
2739 assert(result == NULL || result->in_collection_set(), "sanity"); |
|
fd2b426c30db
7119908: G1: Cache CSet start region for each worker for subsequent reuse
johnc
parents:
4708
diff
changeset
|
2740 return result; |
|
fd2b426c30db
7119908: G1: Cache CSet start region for each worker for subsequent reuse
johnc
parents:
4708
diff
changeset
|
2741 } |
|
fd2b426c30db
7119908: G1: Cache CSet start region for each worker for subsequent reuse
johnc
parents:
4708
diff
changeset
|
2742 |
|
fd2b426c30db
7119908: G1: Cache CSet start region for each worker for subsequent reuse
johnc
parents:
4708
diff
changeset
|
2743 // The cached entry was not valid so let's calculate |
|
fd2b426c30db
7119908: G1: Cache CSet start region for each worker for subsequent reuse
johnc
parents:
4708
diff
changeset
|
2744 // a suitable starting heap region for this worker. |
|
fd2b426c30db
7119908: G1: Cache CSet start region for each worker for subsequent reuse
johnc
parents:
4708
diff
changeset
|
2745 |
|
fd2b426c30db
7119908: G1: Cache CSet start region for each worker for subsequent reuse
johnc
parents:
4708
diff
changeset
|
2746 // We want the parallel threads to start their collection |
|
fd2b426c30db
7119908: G1: Cache CSet start region for each worker for subsequent reuse
johnc
parents:
4708
diff
changeset
|
2747 // set iteration at different collection set regions to |
|
fd2b426c30db
7119908: G1: Cache CSet start region for each worker for subsequent reuse
johnc
parents:
4708
diff
changeset
|
2748 // avoid contention. |
|
fd2b426c30db
7119908: G1: Cache CSet start region for each worker for subsequent reuse
johnc
parents:
4708
diff
changeset
|
2749 // If we have: |
|
fd2b426c30db
7119908: G1: Cache CSet start region for each worker for subsequent reuse
johnc
parents:
4708
diff
changeset
|
2750 // n collection set regions |
|
fd2b426c30db
7119908: G1: Cache CSet start region for each worker for subsequent reuse
johnc
parents:
4708
diff
changeset
|
2751 // p threads |
|
fd2b426c30db
7119908: G1: Cache CSet start region for each worker for subsequent reuse
johnc
parents:
4708
diff
changeset
|
2752 // Then thread t will start at region floor ((t * n) / p) |
|
fd2b426c30db
7119908: G1: Cache CSet start region for each worker for subsequent reuse
johnc
parents:
4708
diff
changeset
|
2753 |
|
fd2b426c30db
7119908: G1: Cache CSet start region for each worker for subsequent reuse
johnc
parents:
4708
diff
changeset
|
2754 result = g1_policy()->collection_set(); |
|
4097
dc467e8b2c5e
7112743: G1: Reduce overhead of marking closure during evacuation pauses
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parents:
4095
diff
changeset
|
2755 if (G1CollectedHeap::use_parallel_gc_threads()) { |
|
dc467e8b2c5e
7112743: G1: Reduce overhead of marking closure during evacuation pauses
johnc
parents:
4095
diff
changeset
|
2756 size_t cs_size = g1_policy()->cset_region_length(); |
|
4728
441e946dc1af
7121618: Change type of number of GC workers to unsigned int.
jmasa
parents:
4711
diff
changeset
|
2757 uint active_workers = workers()->active_workers(); |
|
4709
fd2b426c30db
7119908: G1: Cache CSet start region for each worker for subsequent reuse
johnc
parents:
4708
diff
changeset
|
2758 assert(UseDynamicNumberOfGCThreads || |
|
fd2b426c30db
7119908: G1: Cache CSet start region for each worker for subsequent reuse
johnc
parents:
4708
diff
changeset
|
2759 active_workers == workers()->total_workers(), |
|
fd2b426c30db
7119908: G1: Cache CSet start region for each worker for subsequent reuse
johnc
parents:
4708
diff
changeset
|
2760 "Unless dynamic should use total workers"); |
|
fd2b426c30db
7119908: G1: Cache CSet start region for each worker for subsequent reuse
johnc
parents:
4708
diff
changeset
|
2761 |
|
fd2b426c30db
7119908: G1: Cache CSet start region for each worker for subsequent reuse
johnc
parents:
4708
diff
changeset
|
2762 size_t end_ind = (cs_size * worker_i) / active_workers; |
|
fd2b426c30db
7119908: G1: Cache CSet start region for each worker for subsequent reuse
johnc
parents:
4708
diff
changeset
|
2763 size_t start_ind = 0; |
|
fd2b426c30db
7119908: G1: Cache CSet start region for each worker for subsequent reuse
johnc
parents:
4708
diff
changeset
|
2764 |
|
fd2b426c30db
7119908: G1: Cache CSet start region for each worker for subsequent reuse
johnc
parents:
4708
diff
changeset
|
2765 if (worker_i > 0 && |
|
fd2b426c30db
7119908: G1: Cache CSet start region for each worker for subsequent reuse
johnc
parents:
4708
diff
changeset
|
2766 _worker_cset_start_region_time_stamp[worker_i - 1] == gc_time_stamp) { |
|
fd2b426c30db
7119908: G1: Cache CSet start region for each worker for subsequent reuse
johnc
parents:
4708
diff
changeset
|
2767 // Previous workers starting region is valid |
|
fd2b426c30db
7119908: G1: Cache CSet start region for each worker for subsequent reuse
johnc
parents:
4708
diff
changeset
|
2768 // so let's iterate from there |
|
fd2b426c30db
7119908: G1: Cache CSet start region for each worker for subsequent reuse
johnc
parents:
4708
diff
changeset
|
2769 start_ind = (cs_size * (worker_i - 1)) / active_workers; |
|
fd2b426c30db
7119908: G1: Cache CSet start region for each worker for subsequent reuse
johnc
parents:
4708
diff
changeset
|
2770 result = _worker_cset_start_region[worker_i - 1]; |
|
fd2b426c30db
7119908: G1: Cache CSet start region for each worker for subsequent reuse
johnc
parents:
4708
diff
changeset
|
2771 } |
|
fd2b426c30db
7119908: G1: Cache CSet start region for each worker for subsequent reuse
johnc
parents:
4708
diff
changeset
|
2772 |
|
fd2b426c30db
7119908: G1: Cache CSet start region for each worker for subsequent reuse
johnc
parents:
4708
diff
changeset
|
2773 for (size_t i = start_ind; i < end_ind; i++) { |
|
4097
dc467e8b2c5e
7112743: G1: Reduce overhead of marking closure during evacuation pauses
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parents:
4095
diff
changeset
|
2774 result = result->next_in_collection_set(); |
|
dc467e8b2c5e
7112743: G1: Reduce overhead of marking closure during evacuation pauses
johnc
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4095
diff
changeset
|
2775 } |
|
dc467e8b2c5e
7112743: G1: Reduce overhead of marking closure during evacuation pauses
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parents:
4095
diff
changeset
|
2776 } |
|
4709
fd2b426c30db
7119908: G1: Cache CSet start region for each worker for subsequent reuse
johnc
parents:
4708
diff
changeset
|
2777 |
|
fd2b426c30db
7119908: G1: Cache CSet start region for each worker for subsequent reuse
johnc
parents:
4708
diff
changeset
|
2778 // Note: the calculated starting heap region may be NULL |
|
fd2b426c30db
7119908: G1: Cache CSet start region for each worker for subsequent reuse
johnc
parents:
4708
diff
changeset
|
2779 // (when the collection set is empty). |
|
fd2b426c30db
7119908: G1: Cache CSet start region for each worker for subsequent reuse
johnc
parents:
4708
diff
changeset
|
2780 assert(result == NULL || result->in_collection_set(), "sanity"); |
|
fd2b426c30db
7119908: G1: Cache CSet start region for each worker for subsequent reuse
johnc
parents:
4708
diff
changeset
|
2781 assert(_worker_cset_start_region_time_stamp[worker_i] != gc_time_stamp, |
|
fd2b426c30db
7119908: G1: Cache CSet start region for each worker for subsequent reuse
johnc
parents:
4708
diff
changeset
|
2782 "should be updated only once per pause"); |
|
fd2b426c30db
7119908: G1: Cache CSet start region for each worker for subsequent reuse
johnc
parents:
4708
diff
changeset
|
2783 _worker_cset_start_region[worker_i] = result; |
|
fd2b426c30db
7119908: G1: Cache CSet start region for each worker for subsequent reuse
johnc
parents:
4708
diff
changeset
|
2784 OrderAccess::storestore(); |
|
fd2b426c30db
7119908: G1: Cache CSet start region for each worker for subsequent reuse
johnc
parents:
4708
diff
changeset
|
2785 _worker_cset_start_region_time_stamp[worker_i] = gc_time_stamp; |
|
4097
dc467e8b2c5e
7112743: G1: Reduce overhead of marking closure during evacuation pauses
johnc
parents:
4095
diff
changeset
|
2786 return result; |
|
dc467e8b2c5e
7112743: G1: Reduce overhead of marking closure during evacuation pauses
johnc
parents:
4095
diff
changeset
|
2787 } |
|
dc467e8b2c5e
7112743: G1: Reduce overhead of marking closure during evacuation pauses
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4095
diff
changeset
|
2788 |
| 342 | 2789 void G1CollectedHeap::collection_set_iterate(HeapRegionClosure* cl) { |
| 2790 HeapRegion* r = g1_policy()->collection_set(); | |
| 2791 while (r != NULL) { | |
| 2792 HeapRegion* next = r->next_in_collection_set(); | |
| 2793 if (cl->doHeapRegion(r)) { | |
| 2794 cl->incomplete(); | |
| 2795 return; | |
| 2796 } | |
| 2797 r = next; | |
| 2798 } | |
| 2799 } | |
| 2800 | |
| 2801 void G1CollectedHeap::collection_set_iterate_from(HeapRegion* r, | |
| 2802 HeapRegionClosure *cl) { | |
|
1656
4e5661ba9d98
6944166: G1: explicit GCs are not always handled correctly
tonyp
parents:
1611
diff
changeset
|
2803 if (r == NULL) { |
|
4e5661ba9d98
6944166: G1: explicit GCs are not always handled correctly
tonyp
parents:
1611
diff
changeset
|
2804 // The CSet is empty so there's nothing to do. |
|
4e5661ba9d98
6944166: G1: explicit GCs are not always handled correctly
tonyp
parents:
1611
diff
changeset
|
2805 return; |
|
4e5661ba9d98
6944166: G1: explicit GCs are not always handled correctly
tonyp
parents:
1611
diff
changeset
|
2806 } |
|
4e5661ba9d98
6944166: G1: explicit GCs are not always handled correctly
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parents:
1611
diff
changeset
|
2807 |
| 342 | 2808 assert(r->in_collection_set(), |
| 2809 "Start region must be a member of the collection set."); | |
| 2810 HeapRegion* cur = r; | |
| 2811 while (cur != NULL) { | |
| 2812 HeapRegion* next = cur->next_in_collection_set(); | |
| 2813 if (cl->doHeapRegion(cur) && false) { | |
| 2814 cl->incomplete(); | |
| 2815 return; | |
| 2816 } | |
| 2817 cur = next; | |
| 2818 } | |
| 2819 cur = g1_policy()->collection_set(); | |
| 2820 while (cur != r) { | |
| 2821 HeapRegion* next = cur->next_in_collection_set(); | |
| 2822 if (cl->doHeapRegion(cur) && false) { | |
| 2823 cl->incomplete(); | |
| 2824 return; | |
| 2825 } | |
| 2826 cur = next; | |
| 2827 } | |
| 2828 } | |
| 2829 | |
| 2830 CompactibleSpace* G1CollectedHeap::first_compactible_space() { | |
| 3766 | 2831 return n_regions() > 0 ? region_at(0) : NULL; |
| 342 | 2832 } |
| 2833 | |
| 2834 | |
| 2835 Space* G1CollectedHeap::space_containing(const void* addr) const { | |
| 2836 Space* res = heap_region_containing(addr); | |
| 2837 if (res == NULL) | |
| 2838 res = perm_gen()->space_containing(addr); | |
| 2839 return res; | |
| 2840 } | |
| 2841 | |
| 2842 HeapWord* G1CollectedHeap::block_start(const void* addr) const { | |
| 2843 Space* sp = space_containing(addr); | |
| 2844 if (sp != NULL) { | |
| 2845 return sp->block_start(addr); | |
| 2846 } | |
| 2847 return NULL; | |
| 2848 } | |
| 2849 | |
| 2850 size_t G1CollectedHeap::block_size(const HeapWord* addr) const { | |
| 2851 Space* sp = space_containing(addr); | |
| 2852 assert(sp != NULL, "block_size of address outside of heap"); | |
| 2853 return sp->block_size(addr); | |
| 2854 } | |
| 2855 | |
| 2856 bool G1CollectedHeap::block_is_obj(const HeapWord* addr) const { | |
| 2857 Space* sp = space_containing(addr); | |
| 2858 return sp->block_is_obj(addr); | |
| 2859 } | |
| 2860 | |
| 2861 bool G1CollectedHeap::supports_tlab_allocation() const { | |
| 2862 return true; | |
| 2863 } | |
| 2864 | |
| 2865 size_t G1CollectedHeap::tlab_capacity(Thread* ignored) const { | |
| 2866 return HeapRegion::GrainBytes; | |
| 2867 } | |
| 2868 | |
| 2869 size_t G1CollectedHeap::unsafe_max_tlab_alloc(Thread* ignored) const { | |
| 2870 // Return the remaining space in the cur alloc region, but not less than | |
| 2871 // the min TLAB size. | |
|
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|
2872 |
|
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|
2873 // Also, this value can be at most the humongous object threshold, |
|
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|
2874 // since we can't allow tlabs to grow big enough to accomodate |
|
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|
2875 // humongous objects. |
|
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|
2876 |
|
2433
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|
2877 HeapRegion* hr = _mutator_alloc_region.get(); |
|
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|
2878 size_t max_tlab_size = _humongous_object_threshold_in_words * wordSize; |
|
2433
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|
2879 if (hr == NULL) { |
|
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|
2880 return max_tlab_size; |
| 342 | 2881 } else { |
|
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|
2882 return MIN2(MAX2(hr->free(), (size_t) MinTLABSize), max_tlab_size); |
| 342 | 2883 } |
| 2884 } | |
| 2885 | |
| 2886 size_t G1CollectedHeap::max_capacity() const { | |
|
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|
2887 return _g1_reserved.byte_size(); |
| 342 | 2888 } |
| 2889 | |
| 2890 jlong G1CollectedHeap::millis_since_last_gc() { | |
| 2891 // assert(false, "NYI"); | |
| 2892 return 0; | |
| 2893 } | |
| 2894 | |
| 2895 void G1CollectedHeap::prepare_for_verify() { | |
| 2896 if (SafepointSynchronize::is_at_safepoint() || ! UseTLAB) { | |
| 2897 ensure_parsability(false); | |
| 2898 } | |
| 2899 g1_rem_set()->prepare_for_verify(); | |
| 2900 } | |
| 2901 | |
| 2902 class VerifyLivenessOopClosure: public OopClosure { | |
|
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|
2903 G1CollectedHeap* _g1h; |
|
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|
2904 VerifyOption _vo; |
| 342 | 2905 public: |
|
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|
2906 VerifyLivenessOopClosure(G1CollectedHeap* g1h, VerifyOption vo): |
|
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2907 _g1h(g1h), _vo(vo) |
|
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|
2908 { } |
|
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|
2909 void do_oop(narrowOop *p) { do_oop_work(p); } |
|
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|
2910 void do_oop( oop *p) { do_oop_work(p); } |
|
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|
2911 |
|
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|
2912 template <class T> void do_oop_work(T *p) { |
|
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|
2913 oop obj = oopDesc::load_decode_heap_oop(p); |
|
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|
2914 guarantee(obj == NULL || !_g1h->is_obj_dead_cond(obj, _vo), |
|
845
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|
2915 "Dead object referenced by a not dead object"); |
| 342 | 2916 } |
| 2917 }; | |
| 2918 | |
| 2919 class VerifyObjsInRegionClosure: public ObjectClosure { | |
| 811 | 2920 private: |
| 342 | 2921 G1CollectedHeap* _g1h; |
| 2922 size_t _live_bytes; | |
| 2923 HeapRegion *_hr; | |
|
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|
2924 VerifyOption _vo; |
| 342 | 2925 public: |
|
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|
2926 // _vo == UsePrevMarking -> use "prev" marking information, |
|
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|
2927 // _vo == UseNextMarking -> use "next" marking information, |
|
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|
2928 // _vo == UseMarkWord -> use mark word from object header. |
|
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|
2929 VerifyObjsInRegionClosure(HeapRegion *hr, VerifyOption vo) |
|
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|
2930 : _live_bytes(0), _hr(hr), _vo(vo) { |
| 342 | 2931 _g1h = G1CollectedHeap::heap(); |
| 2932 } | |
| 2933 void do_object(oop o) { | |
|
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|
2934 VerifyLivenessOopClosure isLive(_g1h, _vo); |
| 342 | 2935 assert(o != NULL, "Huh?"); |
|
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|
2936 if (!_g1h->is_obj_dead_cond(o, _vo)) { |
|
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|
2937 // If the object is alive according to the mark word, |
|
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|
2938 // then verify that the marking information agrees. |
|
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|
2939 // Note we can't verify the contra-positive of the |
|
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|
2940 // above: if the object is dead (according to the mark |
|
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|
2941 // word), it may not be marked, or may have been marked |
|
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|
2942 // but has since became dead, or may have been allocated |
|
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|
2943 // since the last marking. |
|
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|
2944 if (_vo == VerifyOption_G1UseMarkWord) { |
|
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|
2945 guarantee(!_g1h->is_obj_dead(o), "mark word and concurrent mark mismatch"); |
|
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|
2946 } |
|
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|
2947 |
| 342 | 2948 o->oop_iterate(&isLive); |
|
1389
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|
2949 if (!_hr->obj_allocated_since_prev_marking(o)) { |
|
5dbd9300cf9c
6943926: G1: Integer overflow during heap region verification
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|
2950 size_t obj_size = o->size(); // Make sure we don't overflow |
|
5dbd9300cf9c
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|
2951 _live_bytes += (obj_size * HeapWordSize); |
|
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|
2952 } |
| 342 | 2953 } |
| 2954 } | |
| 2955 size_t live_bytes() { return _live_bytes; } | |
| 2956 }; | |
| 2957 | |
| 2958 class PrintObjsInRegionClosure : public ObjectClosure { | |
| 2959 HeapRegion *_hr; | |
| 2960 G1CollectedHeap *_g1; | |
| 2961 public: | |
| 2962 PrintObjsInRegionClosure(HeapRegion *hr) : _hr(hr) { | |
| 2963 _g1 = G1CollectedHeap::heap(); | |
| 2964 }; | |
| 2965 | |
| 2966 void do_object(oop o) { | |
| 2967 if (o != NULL) { | |
| 2968 HeapWord *start = (HeapWord *) o; | |
| 2969 size_t word_sz = o->size(); | |
| 2970 gclog_or_tty->print("\nPrinting obj "PTR_FORMAT" of size " SIZE_FORMAT | |
| 2971 " isMarkedPrev %d isMarkedNext %d isAllocSince %d\n", | |
| 2972 (void*) o, word_sz, | |
| 2973 _g1->isMarkedPrev(o), | |
| 2974 _g1->isMarkedNext(o), | |
| 2975 _hr->obj_allocated_since_prev_marking(o)); | |
| 2976 HeapWord *end = start + word_sz; | |
| 2977 HeapWord *cur; | |
| 2978 int *val; | |
| 2979 for (cur = start; cur < end; cur++) { | |
| 2980 val = (int *) cur; | |
| 2981 gclog_or_tty->print("\t "PTR_FORMAT":"PTR_FORMAT"\n", val, *val); | |
| 2982 } | |
| 2983 } | |
| 2984 } | |
| 2985 }; | |
| 2986 | |
| 2987 class VerifyRegionClosure: public HeapRegionClosure { | |
| 811 | 2988 private: |
|
3772
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|
2989 bool _allow_dirty; |
|
6747fd0512e0
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|
2990 bool _par; |
|
6747fd0512e0
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|
2991 VerifyOption _vo; |
|
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|
2992 bool _failures; |
| 811 | 2993 public: |
|
3772
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|
2994 // _vo == UsePrevMarking -> use "prev" marking information, |
|
6747fd0512e0
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|
2995 // _vo == UseNextMarking -> use "next" marking information, |
|
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|
2996 // _vo == UseMarkWord -> use mark word from object header. |
|
6747fd0512e0
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|
2997 VerifyRegionClosure(bool allow_dirty, bool par, VerifyOption vo) |
|
845
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|
2998 : _allow_dirty(allow_dirty), |
|
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6700789: G1: Enable use of compressed oops with G1 heaps
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|
2999 _par(par), |
|
3772
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changeset
|
3000 _vo(vo), |
|
1020
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changeset
|
3001 _failures(false) {} |
|
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changeset
|
3002 |
|
ff2402f6a50b
6882730: G1: parallel heap verification messes up region dump
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changeset
|
3003 bool failures() { |
|
ff2402f6a50b
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diff
changeset
|
3004 return _failures; |
|
ff2402f6a50b
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changeset
|
3005 } |
|
845
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|
3006 |
| 342 | 3007 bool doHeapRegion(HeapRegion* r) { |
| 390 | 3008 guarantee(_par || r->claim_value() == HeapRegion::InitialClaimValue, |
| 3009 "Should be unclaimed at verify points."); | |
|
637
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6817419: G1: Enable extensive verification for humongous regions
iveresov
parents:
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diff
changeset
|
3010 if (!r->continuesHumongous()) { |
|
1020
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|
3011 bool failures = false; |
|
3772
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changeset
|
3012 r->verify(_allow_dirty, _vo, &failures); |
|
1020
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|
3013 if (failures) { |
|
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changeset
|
3014 _failures = true; |
|
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|
3015 } else { |
|
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|
3016 VerifyObjsInRegionClosure not_dead_yet_cl(r, _vo); |
|
1020
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|
3017 r->object_iterate(¬_dead_yet_cl); |
|
4787
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|
3018 if (_vo != VerifyOption_G1UseNextMarking) { |
|
2ace1c4ee8da
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changeset
|
3019 if (r->max_live_bytes() < not_dead_yet_cl.live_bytes()) { |
|
2ace1c4ee8da
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|
3020 gclog_or_tty->print_cr("["PTR_FORMAT","PTR_FORMAT"] " |
|
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
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changeset
|
3021 "max_live_bytes "SIZE_FORMAT" " |
|
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changeset
|
3022 "< calculated "SIZE_FORMAT, |
|
2ace1c4ee8da
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|
3023 r->bottom(), r->end(), |
|
2ace1c4ee8da
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changeset
|
3024 r->max_live_bytes(), |
|
1020
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changeset
|
3025 not_dead_yet_cl.live_bytes()); |
|
4787
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changeset
|
3026 _failures = true; |
|
2ace1c4ee8da
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changeset
|
3027 } |
|
2ace1c4ee8da
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diff
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|
3028 } else { |
|
2ace1c4ee8da
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changeset
|
3029 // When vo == UseNextMarking we cannot currently do a sanity |
|
2ace1c4ee8da
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changeset
|
3030 // check on the live bytes as the calculation has not been |
|
2ace1c4ee8da
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|
3031 // finalized yet. |
|
1020
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|
3032 } |
|
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|
3033 } |
| 342 | 3034 } |
|
1020
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changeset
|
3035 return false; // stop the region iteration if we hit a failure |
| 342 | 3036 } |
| 3037 }; | |
| 3038 | |
| 3039 class VerifyRootsClosure: public OopsInGenClosure { | |
| 3040 private: | |
| 3041 G1CollectedHeap* _g1h; | |
|
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changeset
|
3042 VerifyOption _vo; |
| 342 | 3043 bool _failures; |
| 3044 public: | |
|
3772
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changeset
|
3045 // _vo == UsePrevMarking -> use "prev" marking information, |
|
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changeset
|
3046 // _vo == UseNextMarking -> use "next" marking information, |
|
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|
3047 // _vo == UseMarkWord -> use mark word from object header. |
|
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|
3048 VerifyRootsClosure(VerifyOption vo) : |
|
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3049 _g1h(G1CollectedHeap::heap()), |
|
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|
3050 _vo(vo), |
|
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|
3051 _failures(false) { } |
| 342 | 3052 |
| 3053 bool failures() { return _failures; } | |
| 3054 | |
|
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|
3055 template <class T> void do_oop_nv(T* p) { |
|
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|
3056 T heap_oop = oopDesc::load_heap_oop(p); |
|
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|
3057 if (!oopDesc::is_null(heap_oop)) { |
|
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|
3058 oop obj = oopDesc::decode_heap_oop_not_null(heap_oop); |
|
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|
3059 if (_g1h->is_obj_dead_cond(obj, _vo)) { |
| 342 | 3060 gclog_or_tty->print_cr("Root location "PTR_FORMAT" " |
|
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|
3061 "points to dead obj "PTR_FORMAT, p, (void*) obj); |
|
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|
3062 if (_vo == VerifyOption_G1UseMarkWord) { |
|
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|
3063 gclog_or_tty->print_cr(" Mark word: "PTR_FORMAT, (void*)(obj->mark())); |
|
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|
3064 } |
| 342 | 3065 obj->print_on(gclog_or_tty); |
| 3066 _failures = true; | |
| 3067 } | |
| 3068 } | |
| 3069 } | |
|
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|
3070 |
|
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|
3071 void do_oop(oop* p) { do_oop_nv(p); } |
|
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|
3072 void do_oop(narrowOop* p) { do_oop_nv(p); } |
| 342 | 3073 }; |
| 3074 | |
| 390 | 3075 // This is the task used for parallel heap verification. |
| 3076 | |
| 3077 class G1ParVerifyTask: public AbstractGangTask { | |
| 3078 private: | |
| 3079 G1CollectedHeap* _g1h; | |
|
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|
3080 bool _allow_dirty; |
|
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|
3081 VerifyOption _vo; |
|
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|
3082 bool _failures; |
| 390 | 3083 |
| 3084 public: | |
|
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|
3085 // _vo == UsePrevMarking -> use "prev" marking information, |
|
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|
3086 // _vo == UseNextMarking -> use "next" marking information, |
|
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|
3087 // _vo == UseMarkWord -> use mark word from object header. |
|
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|
3088 G1ParVerifyTask(G1CollectedHeap* g1h, bool allow_dirty, VerifyOption vo) : |
| 390 | 3089 AbstractGangTask("Parallel verify task"), |
|
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|
3090 _g1h(g1h), |
|
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|
3091 _allow_dirty(allow_dirty), |
|
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|
3092 _vo(vo), |
|
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|
3093 _failures(false) { } |
|
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|
3094 |
|
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|
3095 bool failures() { |
|
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|
3096 return _failures; |
|
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|
3097 } |
| 390 | 3098 |
|
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|
3099 void work(uint worker_id) { |
|
637
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|
3100 HandleMark hm; |
|
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|
3101 VerifyRegionClosure blk(_allow_dirty, true, _vo); |
|
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|
3102 _g1h->heap_region_par_iterate_chunked(&blk, worker_id, |
|
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|
3103 _g1h->workers()->active_workers(), |
| 390 | 3104 HeapRegion::ParVerifyClaimValue); |
|
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|
3105 if (blk.failures()) { |
|
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|
3106 _failures = true; |
|
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|
3107 } |
| 390 | 3108 } |
| 3109 }; | |
| 3110 | |
| 342 | 3111 void G1CollectedHeap::verify(bool allow_dirty, bool silent) { |
|
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|
3112 verify(allow_dirty, silent, VerifyOption_G1UsePrevMarking); |
| 811 | 3113 } |
| 3114 | |
| 3115 void G1CollectedHeap::verify(bool allow_dirty, | |
| 3116 bool silent, | |
|
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|
3117 VerifyOption vo) { |
| 342 | 3118 if (SafepointSynchronize::is_at_safepoint() || ! UseTLAB) { |
|
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|
3119 if (!silent) { gclog_or_tty->print("Roots (excluding permgen) "); } |
|
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|
3120 VerifyRootsClosure rootsCl(vo); |
|
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|
3121 |
|
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|
3122 assert(Thread::current()->is_VM_thread(), |
|
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|
3123 "Expected to be executed serially by the VM thread at this point"); |
|
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|
3124 |
|
989
148e5441d916
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|
3125 CodeBlobToOopClosure blobsCl(&rootsCl, /*do_marking=*/ false); |
|
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|
3126 |
|
3293
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|
3127 // We apply the relevant closures to all the oops in the |
|
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|
3128 // system dictionary, the string table and the code cache. |
|
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|
3129 const int so = SharedHeap::SO_AllClasses | SharedHeap::SO_Strings | SharedHeap::SO_CodeCache; |
|
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|
3130 |
|
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|
3131 process_strong_roots(true, // activate StrongRootsScope |
|
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|
3132 true, // we set "collecting perm gen" to true, |
|
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changeset
|
3133 // so we don't reset the dirty cards in the perm gen. |
|
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changeset
|
3134 SharedHeap::ScanningOption(so), // roots scanning options |
| 342 | 3135 &rootsCl, |
|
989
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|
3136 &blobsCl, |
| 342 | 3137 &rootsCl); |
|
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|
3138 |
|
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changeset
|
3139 // If we're verifying after the marking phase of a Full GC then we can't |
|
6747fd0512e0
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changeset
|
3140 // treat the perm gen as roots into the G1 heap. Some of the objects in |
|
6747fd0512e0
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|
3141 // the perm gen may be dead and hence not marked. If one of these dead |
|
6747fd0512e0
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changeset
|
3142 // objects is considered to be a root then we may end up with a false |
|
6747fd0512e0
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changeset
|
3143 // "Root location <x> points to dead ob <y>" failure. |
|
6747fd0512e0
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changeset
|
3144 if (vo != VerifyOption_G1UseMarkWord) { |
|
6747fd0512e0
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diff
changeset
|
3145 // Since we used "collecting_perm_gen" == true above, we will not have |
|
6747fd0512e0
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diff
changeset
|
3146 // checked the refs from perm into the G1-collected heap. We check those |
|
6747fd0512e0
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changeset
|
3147 // references explicitly below. Whether the relevant cards are dirty |
|
6747fd0512e0
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changeset
|
3148 // is checked further below in the rem set verification. |
|
6747fd0512e0
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diff
changeset
|
3149 if (!silent) { gclog_or_tty->print("Permgen roots "); } |
|
6747fd0512e0
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changeset
|
3150 perm_gen()->oop_iterate(&rootsCl); |
|
6747fd0512e0
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|
3151 } |
|
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|
3152 bool failures = rootsCl.failures(); |
|
3772
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3766
diff
changeset
|
3153 |
|
6747fd0512e0
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3766
diff
changeset
|
3154 if (vo != VerifyOption_G1UseMarkWord) { |
|
6747fd0512e0
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diff
changeset
|
3155 // If we're verifying during a full GC then the region sets |
|
6747fd0512e0
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diff
changeset
|
3156 // will have been torn down at the start of the GC. Therefore |
|
6747fd0512e0
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3766
diff
changeset
|
3157 // verifying the region sets will fail. So we only verify |
|
6747fd0512e0
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3766
diff
changeset
|
3158 // the region sets when not in a full GC. |
|
6747fd0512e0
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diff
changeset
|
3159 if (!silent) { gclog_or_tty->print("HeapRegionSets "); } |
|
6747fd0512e0
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johnc
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3766
diff
changeset
|
3160 verify_region_sets(); |
|
6747fd0512e0
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diff
changeset
|
3161 } |
|
6747fd0512e0
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|
3162 |
| 2152 | 3163 if (!silent) { gclog_or_tty->print("HeapRegions "); } |
| 390 | 3164 if (GCParallelVerificationEnabled && ParallelGCThreads > 1) { |
| 3165 assert(check_heap_region_claim_values(HeapRegion::InitialClaimValue), | |
| 3166 "sanity check"); | |
| 3167 | |
|
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|
3168 G1ParVerifyTask task(this, allow_dirty, vo); |
|
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|
3169 assert(UseDynamicNumberOfGCThreads || |
|
bca17e38de00
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changeset
|
3170 workers()->active_workers() == workers()->total_workers(), |
|
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|
3171 "If not dynamic should be using all the workers"); |
|
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|
3172 int n_workers = workers()->active_workers(); |
| 390 | 3173 set_par_threads(n_workers); |
| 3174 workers()->run_task(&task); | |
| 3175 set_par_threads(0); | |
|
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|
3176 if (task.failures()) { |
|
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|
3177 failures = true; |
|
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|
3178 } |
| 390 | 3179 |
|
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|
3180 // Checks that the expected amount of parallel work was done. |
|
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|
3181 // The implication is that n_workers is > 0. |
| 390 | 3182 assert(check_heap_region_claim_values(HeapRegion::ParVerifyClaimValue), |
| 3183 "sanity check"); | |
| 3184 | |
| 3185 reset_heap_region_claim_values(); | |
| 3186 | |
| 3187 assert(check_heap_region_claim_values(HeapRegion::InitialClaimValue), | |
| 3188 "sanity check"); | |
| 3189 } else { | |
|
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|
3190 VerifyRegionClosure blk(allow_dirty, false, vo); |
| 3766 | 3191 heap_region_iterate(&blk); |
|
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|
3192 if (blk.failures()) { |
|
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|
3193 failures = true; |
|
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|
3194 } |
| 390 | 3195 } |
| 2152 | 3196 if (!silent) gclog_or_tty->print("RemSet "); |
| 342 | 3197 rem_set()->verify(); |
|
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|
3198 |
|
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|
3199 if (failures) { |
|
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|
3200 gclog_or_tty->print_cr("Heap:"); |
|
4073
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|
3201 // It helps to have the per-region information in the output to |
|
53074c2c4600
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4072
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changeset
|
3202 // help us track down what went wrong. This is why we call |
|
53074c2c4600
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|
3203 // print_extended_on() instead of print_on(). |
|
53074c2c4600
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changeset
|
3204 print_extended_on(gclog_or_tty); |
|
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|
3205 gclog_or_tty->print_cr(""); |
|
1547
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|
3206 #ifndef PRODUCT |
| 1044 | 3207 if (VerifyDuringGC && G1VerifyDuringGCPrintReachable) { |
| 1388 | 3208 concurrent_mark()->print_reachable("at-verification-failure", |
|
3772
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|
3209 vo, false /* all */); |
|
1020
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|
3210 } |
|
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|
3211 #endif |
|
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|
3212 gclog_or_tty->flush(); |
|
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|
3213 } |
|
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|
3214 guarantee(!failures, "there should not have been any failures"); |
| 342 | 3215 } else { |
| 3216 if (!silent) gclog_or_tty->print("(SKIPPING roots, heapRegions, remset) "); | |
| 3217 } | |
| 3218 } | |
| 3219 | |
| 3220 class PrintRegionClosure: public HeapRegionClosure { | |
| 3221 outputStream* _st; | |
| 3222 public: | |
| 3223 PrintRegionClosure(outputStream* st) : _st(st) {} | |
| 3224 bool doHeapRegion(HeapRegion* r) { | |
| 3225 r->print_on(_st); | |
| 3226 return false; | |
| 3227 } | |
| 3228 }; | |
| 3229 | |
| 3230 void G1CollectedHeap::print_on(outputStream* st) const { | |
|
838
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|
3231 st->print(" %-20s", "garbage-first heap"); |
|
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|
3232 st->print(" total " SIZE_FORMAT "K, used " SIZE_FORMAT "K", |
|
846
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6859911: G1: assert(Heap_lock->owner() = NULL, "Should be owned on this thread's behalf")
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|
3233 capacity()/K, used_unlocked()/K); |
|
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|
3234 st->print(" [" INTPTR_FORMAT ", " INTPTR_FORMAT ", " INTPTR_FORMAT ")", |
|
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|
3235 _g1_storage.low_boundary(), |
|
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|
3236 _g1_storage.high(), |
|
0316eac49d5a
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|
3237 _g1_storage.high_boundary()); |
|
0316eac49d5a
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|
3238 st->cr(); |
|
3986
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7095194: G1: HeapRegion::GrainBytes, GrainWords, and CardsPerRegion should be size_t
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|
3239 st->print(" region size " SIZE_FORMAT "K, ", HeapRegion::GrainBytes / K); |
|
838
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|
3240 size_t young_regions = _young_list->length(); |
|
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|
3241 st->print(SIZE_FORMAT " young (" SIZE_FORMAT "K), ", |
|
0316eac49d5a
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|
3242 young_regions, young_regions * HeapRegion::GrainBytes / K); |
|
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|
3243 size_t survivor_regions = g1_policy()->recorded_survivor_regions(); |
|
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3244 st->print(SIZE_FORMAT " survivors (" SIZE_FORMAT "K)", |
|
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|
3245 survivor_regions, survivor_regions * HeapRegion::GrainBytes / K); |
|
0316eac49d5a
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|
3246 st->cr(); |
|
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|
3247 perm()->as_gen()->print_on(st); |
|
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|
3248 } |
|
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|
3249 |
|
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|
3250 void G1CollectedHeap::print_extended_on(outputStream* st) const { |
|
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|
3251 print_on(st); |
|
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|
3252 |
|
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|
3253 // Print the per-region information. |
|
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|
3254 st->cr(); |
|
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|
3255 st->print_cr("Heap Regions: (Y=young(eden), SU=young(survivor), HS=humongous(starts), HC=humongous(continues), CS=collection set, F=free, TS=gc time stamp, PTAMS=previous top-at-mark-start, NTAMS=next top-at-mark-start)"); |
| 342 | 3256 PrintRegionClosure blk(st); |
| 3766 | 3257 heap_region_iterate(&blk); |
| 342 | 3258 } |
| 3259 | |
| 3260 void G1CollectedHeap::print_gc_threads_on(outputStream* st) const { | |
|
1833
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|
3261 if (G1CollectedHeap::use_parallel_gc_threads()) { |
| 1019 | 3262 workers()->print_worker_threads_on(st); |
| 3263 } | |
| 3264 _cmThread->print_on(st); | |
| 342 | 3265 st->cr(); |
| 1019 | 3266 _cm->print_worker_threads_on(st); |
| 3267 _cg1r->print_worker_threads_on(st); | |
| 342 | 3268 st->cr(); |
| 3269 } | |
| 3270 | |
| 3271 void G1CollectedHeap::gc_threads_do(ThreadClosure* tc) const { | |
|
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|
3272 if (G1CollectedHeap::use_parallel_gc_threads()) { |
| 342 | 3273 workers()->threads_do(tc); |
| 3274 } | |
| 3275 tc->do_thread(_cmThread); | |
| 794 | 3276 _cg1r->threads_do(tc); |
| 342 | 3277 } |
| 3278 | |
| 3279 void G1CollectedHeap::print_tracing_info() const { | |
| 3280 // We'll overload this to mean "trace GC pause statistics." | |
| 3281 if (TraceGen0Time || TraceGen1Time) { | |
| 3282 // The "G1CollectorPolicy" is keeping track of these stats, so delegate | |
| 3283 // to that. | |
| 3284 g1_policy()->print_tracing_info(); | |
| 3285 } | |
| 751 | 3286 if (G1SummarizeRSetStats) { |
| 342 | 3287 g1_rem_set()->print_summary_info(); |
| 3288 } | |
| 1282 | 3289 if (G1SummarizeConcMark) { |
| 342 | 3290 concurrent_mark()->print_summary_info(); |
| 3291 } | |
| 3292 g1_policy()->print_yg_surv_rate_info(); | |
| 3293 SpecializationStats::print(); | |
| 3294 } | |
| 3295 | |
|
3777
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|
3296 #ifndef PRODUCT |
|
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|
3297 // Helpful for debugging RSet issues. |
|
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|
3298 |
|
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|
3299 class PrintRSetsClosure : public HeapRegionClosure { |
|
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|
3300 private: |
|
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|
3301 const char* _msg; |
|
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|
3302 size_t _occupied_sum; |
|
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|
3303 |
|
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|
3304 public: |
|
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|
3305 bool doHeapRegion(HeapRegion* r) { |
|
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|
3306 HeapRegionRemSet* hrrs = r->rem_set(); |
|
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|
3307 size_t occupied = hrrs->occupied(); |
|
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|
3308 _occupied_sum += occupied; |
|
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|
3309 |
|
e8b0b0392037
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|
3310 gclog_or_tty->print_cr("Printing RSet for region "HR_FORMAT, |
|
e8b0b0392037
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|
3311 HR_FORMAT_PARAMS(r)); |
|
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|
3312 if (occupied == 0) { |
|
e8b0b0392037
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|
3313 gclog_or_tty->print_cr(" RSet is empty"); |
|
e8b0b0392037
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|
3314 } else { |
|
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|
3315 hrrs->print(); |
|
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|
3316 } |
|
e8b0b0392037
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|
3317 gclog_or_tty->print_cr("----------"); |
|
e8b0b0392037
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|
3318 return false; |
|
e8b0b0392037
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|
3319 } |
|
e8b0b0392037
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|
3320 |
|
e8b0b0392037
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|
3321 PrintRSetsClosure(const char* msg) : _msg(msg), _occupied_sum(0) { |
|
e8b0b0392037
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|
3322 gclog_or_tty->cr(); |
|
e8b0b0392037
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|
3323 gclog_or_tty->print_cr("========================================"); |
|
e8b0b0392037
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|
3324 gclog_or_tty->print_cr(msg); |
|
e8b0b0392037
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|
3325 gclog_or_tty->cr(); |
|
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|
3326 } |
|
e8b0b0392037
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|
3327 |
|
e8b0b0392037
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|
3328 ~PrintRSetsClosure() { |
|
e8b0b0392037
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changeset
|
3329 gclog_or_tty->print_cr("Occupied Sum: "SIZE_FORMAT, _occupied_sum); |
|
e8b0b0392037
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|
3330 gclog_or_tty->print_cr("========================================"); |
|
e8b0b0392037
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|
3331 gclog_or_tty->cr(); |
|
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|
3332 } |
|
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|
3333 }; |
|
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|
3334 |
|
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|
3335 void G1CollectedHeap::print_cset_rsets() { |
|
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|
3336 PrintRSetsClosure cl("Printing CSet RSets"); |
|
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|
3337 collection_set_iterate(&cl); |
|
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|
3338 } |
|
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|
3339 |
|
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|
3340 void G1CollectedHeap::print_all_rsets() { |
|
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|
3341 PrintRSetsClosure cl("Printing All RSets");; |
|
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|
3342 heap_region_iterate(&cl); |
|
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|
3343 } |
|
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|
3344 #endif // PRODUCT |
|
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|
3345 |
| 342 | 3346 G1CollectedHeap* G1CollectedHeap::heap() { |
| 3347 assert(_sh->kind() == CollectedHeap::G1CollectedHeap, | |
| 3348 "not a garbage-first heap"); | |
| 3349 return _g1h; | |
| 3350 } | |
| 3351 | |
| 3352 void G1CollectedHeap::gc_prologue(bool full /* Ignored */) { | |
|
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|
3353 // always_do_update_barrier = false; |
| 342 | 3354 assert(InlineCacheBuffer::is_empty(), "should have cleaned up ICBuffer"); |
| 3355 // Call allocation profiler | |
| 3356 AllocationProfiler::iterate_since_last_gc(); | |
| 3357 // Fill TLAB's and such | |
| 3358 ensure_parsability(true); | |
| 3359 } | |
| 3360 | |
| 3361 void G1CollectedHeap::gc_epilogue(bool full /* Ignored */) { | |
| 3362 // FIXME: what is this about? | |
| 3363 // I'm ignoring the "fill_newgen()" call if "alloc_event_enabled" | |
| 3364 // is set. | |
| 3365 COMPILER2_PRESENT(assert(DerivedPointerTable::is_empty(), | |
| 3366 "derived pointer present")); | |
|
1245
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|
3367 // always_do_update_barrier = true; |
|
3979
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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changeset
|
3368 |
|
4dfb2df418f2
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diff
changeset
|
3369 // We have just completed a GC. Update the soft reference |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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diff
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|
3370 // policy with the new heap occupancy |
|
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|
3371 Universe::update_heap_info_at_gc(); |
| 342 | 3372 } |
| 3373 | |
| 1973 | 3374 HeapWord* G1CollectedHeap::do_collection_pause(size_t word_size, |
| 3375 unsigned int gc_count_before, | |
| 3376 bool* succeeded) { | |
| 3377 assert_heap_not_locked_and_not_at_safepoint(); | |
| 342 | 3378 g1_policy()->record_stop_world_start(); |
| 1973 | 3379 VM_G1IncCollectionPause op(gc_count_before, |
| 3380 word_size, | |
| 3381 false, /* should_initiate_conc_mark */ | |
| 3382 g1_policy()->max_pause_time_ms(), | |
| 3383 GCCause::_g1_inc_collection_pause); | |
| 3384 VMThread::execute(&op); | |
| 3385 | |
| 3386 HeapWord* result = op.result(); | |
| 3387 bool ret_succeeded = op.prologue_succeeded() && op.pause_succeeded(); | |
| 3388 assert(result == NULL || ret_succeeded, | |
| 3389 "the result should be NULL if the VM did not succeed"); | |
| 3390 *succeeded = ret_succeeded; | |
| 3391 | |
| 3392 assert_heap_not_locked(); | |
| 3393 return result; | |
| 342 | 3394 } |
| 3395 | |
| 3396 void | |
| 3397 G1CollectedHeap::doConcurrentMark() { | |
|
845
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|
3398 MutexLockerEx x(CGC_lock, Mutex::_no_safepoint_check_flag); |
|
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|
3399 if (!_cmThread->in_progress()) { |
|
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|
3400 _cmThread->set_started(); |
|
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|
3401 CGC_lock->notify(); |
| 342 | 3402 } |
| 3403 } | |
| 3404 | |
| 3405 double G1CollectedHeap::predict_region_elapsed_time_ms(HeapRegion *hr, | |
| 3406 bool young) { | |
| 3407 return _g1_policy->predict_region_elapsed_time_ms(hr, young); | |
| 3408 } | |
| 3409 | |
| 3410 void G1CollectedHeap::check_if_region_is_too_expensive(double | |
| 3411 predicted_time_ms) { | |
| 3412 _g1_policy->check_if_region_is_too_expensive(predicted_time_ms); | |
| 3413 } | |
| 3414 | |
| 3415 size_t G1CollectedHeap::pending_card_num() { | |
| 3416 size_t extra_cards = 0; | |
| 3417 JavaThread *curr = Threads::first(); | |
| 3418 while (curr != NULL) { | |
| 3419 DirtyCardQueue& dcq = curr->dirty_card_queue(); | |
| 3420 extra_cards += dcq.size(); | |
| 3421 curr = curr->next(); | |
| 3422 } | |
| 3423 DirtyCardQueueSet& dcqs = JavaThread::dirty_card_queue_set(); | |
| 3424 size_t buffer_size = dcqs.buffer_size(); | |
| 3425 size_t buffer_num = dcqs.completed_buffers_num(); | |
| 3426 return buffer_size * buffer_num + extra_cards; | |
| 3427 } | |
| 3428 | |
| 3429 size_t G1CollectedHeap::max_pending_card_num() { | |
| 3430 DirtyCardQueueSet& dcqs = JavaThread::dirty_card_queue_set(); | |
| 3431 size_t buffer_size = dcqs.buffer_size(); | |
| 3432 size_t buffer_num = dcqs.completed_buffers_num(); | |
| 3433 int thread_num = Threads::number_of_threads(); | |
| 3434 return (buffer_num + thread_num) * buffer_size; | |
| 3435 } | |
| 3436 | |
| 3437 size_t G1CollectedHeap::cards_scanned() { | |
| 1861 | 3438 return g1_rem_set()->cardsScanned(); |
| 342 | 3439 } |
| 3440 | |
| 3441 void | |
| 3442 G1CollectedHeap::setup_surviving_young_words() { | |
| 3443 guarantee( _surviving_young_words == NULL, "pre-condition" ); | |
|
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|
3444 size_t array_length = g1_policy()->young_cset_region_length(); |
| 342 | 3445 _surviving_young_words = NEW_C_HEAP_ARRAY(size_t, array_length); |
| 3446 if (_surviving_young_words == NULL) { | |
| 3447 vm_exit_out_of_memory(sizeof(size_t) * array_length, | |
| 3448 "Not enough space for young surv words summary."); | |
| 3449 } | |
| 3450 memset(_surviving_young_words, 0, array_length * sizeof(size_t)); | |
|
845
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6700789: G1: Enable use of compressed oops with G1 heaps
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diff
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|
3451 #ifdef ASSERT |
| 342 | 3452 for (size_t i = 0; i < array_length; ++i) { |
|
845
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
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diff
changeset
|
3453 assert( _surviving_young_words[i] == 0, "memset above" ); |
|
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6700789: G1: Enable use of compressed oops with G1 heaps
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diff
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|
3454 } |
|
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diff
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|
3455 #endif // !ASSERT |
| 342 | 3456 } |
| 3457 | |
| 3458 void | |
| 3459 G1CollectedHeap::update_surviving_young_words(size_t* surv_young_words) { | |
| 3460 MutexLockerEx x(ParGCRareEvent_lock, Mutex::_no_safepoint_check_flag); | |
|
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7097002: G1: remove a lot of unused / redundant code from the G1CollectorPolicy class
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|
3461 size_t array_length = g1_policy()->young_cset_region_length(); |
| 342 | 3462 for (size_t i = 0; i < array_length; ++i) |
| 3463 _surviving_young_words[i] += surv_young_words[i]; | |
| 3464 } | |
| 3465 | |
| 3466 void | |
| 3467 G1CollectedHeap::cleanup_surviving_young_words() { | |
| 3468 guarantee( _surviving_young_words != NULL, "pre-condition" ); | |
| 3469 FREE_C_HEAP_ARRAY(size_t, _surviving_young_words); | |
| 3470 _surviving_young_words = NULL; | |
| 3471 } | |
| 3472 | |
|
3777
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7046182: G1: remove unnecessary iterations over the collection set
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diff
changeset
|
3473 #ifdef ASSERT |
|
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diff
changeset
|
3474 class VerifyCSetClosure: public HeapRegionClosure { |
|
e8b0b0392037
7046182: G1: remove unnecessary iterations over the collection set
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parents:
3774
diff
changeset
|
3475 public: |
|
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7046182: G1: remove unnecessary iterations over the collection set
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diff
changeset
|
3476 bool doHeapRegion(HeapRegion* hr) { |
|
e8b0b0392037
7046182: G1: remove unnecessary iterations over the collection set
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parents:
3774
diff
changeset
|
3477 // Here we check that the CSet region's RSet is ready for parallel |
|
e8b0b0392037
7046182: G1: remove unnecessary iterations over the collection set
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parents:
3774
diff
changeset
|
3478 // iteration. The fields that we'll verify are only manipulated |
|
e8b0b0392037
7046182: G1: remove unnecessary iterations over the collection set
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3774
diff
changeset
|
3479 // when the region is part of a CSet and is collected. Afterwards, |
|
e8b0b0392037
7046182: G1: remove unnecessary iterations over the collection set
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diff
changeset
|
3480 // we reset these fields when we clear the region's RSet (when the |
|
e8b0b0392037
7046182: G1: remove unnecessary iterations over the collection set
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3774
diff
changeset
|
3481 // region is freed) so they are ready when the region is |
|
e8b0b0392037
7046182: G1: remove unnecessary iterations over the collection set
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diff
changeset
|
3482 // re-allocated. The only exception to this is if there's an |
|
e8b0b0392037
7046182: G1: remove unnecessary iterations over the collection set
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diff
changeset
|
3483 // evacuation failure and instead of freeing the region we leave |
|
e8b0b0392037
7046182: G1: remove unnecessary iterations over the collection set
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3774
diff
changeset
|
3484 // it in the heap. In that case, we reset these fields during |
|
e8b0b0392037
7046182: G1: remove unnecessary iterations over the collection set
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3774
diff
changeset
|
3485 // evacuation failure handling. |
|
e8b0b0392037
7046182: G1: remove unnecessary iterations over the collection set
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diff
changeset
|
3486 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
|
3487 |
|
e8b0b0392037
7046182: G1: remove unnecessary iterations over the collection set
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diff
changeset
|
3488 // Here's a good place to add any other checks we'd like to |
|
e8b0b0392037
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3774
diff
changeset
|
3489 // perform on CSet regions. |
|
1261
0414c1049f15
6923991: G1: improve scalability of RSet scanning
iveresov
parents:
1245
diff
changeset
|
3490 return false; |
|
0414c1049f15
6923991: G1: improve scalability of RSet scanning
iveresov
parents:
1245
diff
changeset
|
3491 } |
|
0414c1049f15
6923991: G1: improve scalability of RSet scanning
iveresov
parents:
1245
diff
changeset
|
3492 }; |
|
3777
e8b0b0392037
7046182: G1: remove unnecessary iterations over the collection set
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3774
diff
changeset
|
3493 #endif // ASSERT |
|
1261
0414c1049f15
6923991: G1: improve scalability of RSet scanning
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parents:
1245
diff
changeset
|
3494 |
| 1709 | 3495 #if TASKQUEUE_STATS |
| 3496 void G1CollectedHeap::print_taskqueue_stats_hdr(outputStream* const st) { | |
| 3497 st->print_raw_cr("GC Task Stats"); | |
| 3498 st->print_raw("thr "); TaskQueueStats::print_header(1, st); st->cr(); | |
| 3499 st->print_raw("--- "); TaskQueueStats::print_header(2, st); st->cr(); | |
| 3500 } | |
| 3501 | |
| 3502 void G1CollectedHeap::print_taskqueue_stats(outputStream* const st) const { | |
| 3503 print_taskqueue_stats_hdr(st); | |
| 3504 | |
| 3505 TaskQueueStats totals; | |
|
1755
8e5955ddf8e4
6978300: G1: debug builds crash if ParallelGCThreads==0
jcoomes
parents:
1719
diff
changeset
|
3506 const int n = workers() != NULL ? workers()->total_workers() : 1; |
| 1709 | 3507 for (int i = 0; i < n; ++i) { |
| 3508 st->print("%3d ", i); task_queue(i)->stats.print(st); st->cr(); | |
| 3509 totals += task_queue(i)->stats; | |
| 3510 } | |
| 3511 st->print_raw("tot "); totals.print(st); st->cr(); | |
| 3512 | |
| 3513 DEBUG_ONLY(totals.verify()); | |
| 3514 } | |
| 3515 | |
| 3516 void G1CollectedHeap::reset_taskqueue_stats() { | |
|
1755
8e5955ddf8e4
6978300: G1: debug builds crash if ParallelGCThreads==0
jcoomes
parents:
1719
diff
changeset
|
3517 const int n = workers() != NULL ? workers()->total_workers() : 1; |
| 1709 | 3518 for (int i = 0; i < n; ++i) { |
| 3519 task_queue(i)->stats.reset(); | |
| 3520 } | |
| 3521 } | |
| 3522 #endif // TASKQUEUE_STATS | |
| 3523 | |
| 1973 | 3524 bool |
|
1656
4e5661ba9d98
6944166: G1: explicit GCs are not always handled correctly
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1611
diff
changeset
|
3525 G1CollectedHeap::do_collection_pause_at_safepoint(double target_pause_time_ms) { |
| 2152 | 3526 assert_at_safepoint(true /* should_be_vm_thread */); |
| 3527 guarantee(!is_gc_active(), "collection is not reentrant"); | |
| 3528 | |
|
1359
23b1b27ac76c
6909756: G1: guarantee(G1CollectedHeap::heap()->mark_in_progress(),"Precondition.")
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parents:
1313
diff
changeset
|
3529 if (GC_locker::check_active_before_gc()) { |
| 1973 | 3530 return false; |
|
1359
23b1b27ac76c
6909756: G1: guarantee(G1CollectedHeap::heap()->mark_in_progress(),"Precondition.")
tonyp
parents:
1313
diff
changeset
|
3531 } |
|
23b1b27ac76c
6909756: G1: guarantee(G1CollectedHeap::heap()->mark_in_progress(),"Precondition.")
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parents:
1313
diff
changeset
|
3532 |
|
2125
7246a374a9f2
6458402: 3 jvmti tests fail with CMS and +ExplicitGCInvokesConcurrent
kamg
parents:
2039
diff
changeset
|
3533 SvcGCMarker sgcm(SvcGCMarker::MINOR); |
|
2039
7c5250dbd584
6896624: G1: hotspot:::gc and hotspot:::mem-pool-gc probes are not fired
tonyp
parents:
2038
diff
changeset
|
3534 ResourceMark rm; |
|
7c5250dbd584
6896624: G1: hotspot:::gc and hotspot:::mem-pool-gc probes are not fired
tonyp
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2038
diff
changeset
|
3535 |
|
4872
aa3d708d67c4
7141200: log some interesting information in ring buffers for crashes
never
parents:
4787
diff
changeset
|
3536 print_heap_before_gc(); |
|
838
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
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811
diff
changeset
|
3537 |
| 4072 | 3538 HRSPhaseSetter x(HRSPhaseEvacuation); |
| 2152 | 3539 verify_region_sets_optional(); |
|
2433
abdfc822206f
7023069: G1: Introduce symmetric locking in the slow allocation path
tonyp
parents:
2432
diff
changeset
|
3540 verify_dirty_young_regions(); |
| 2152 | 3541 |
|
838
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
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811
diff
changeset
|
3542 { |
|
1359
23b1b27ac76c
6909756: G1: guarantee(G1CollectedHeap::heap()->mark_in_progress(),"Precondition.")
tonyp
parents:
1313
diff
changeset
|
3543 // This call will decide whether this pause is an initial-mark |
|
23b1b27ac76c
6909756: G1: guarantee(G1CollectedHeap::heap()->mark_in_progress(),"Precondition.")
tonyp
parents:
1313
diff
changeset
|
3544 // pause. If it is, during_initial_mark_pause() will return true |
|
23b1b27ac76c
6909756: G1: guarantee(G1CollectedHeap::heap()->mark_in_progress(),"Precondition.")
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1313
diff
changeset
|
3545 // for the duration of this pause. |
|
23b1b27ac76c
6909756: G1: guarantee(G1CollectedHeap::heap()->mark_in_progress(),"Precondition.")
tonyp
parents:
1313
diff
changeset
|
3546 g1_policy()->decide_on_conc_mark_initiation(); |
|
23b1b27ac76c
6909756: G1: guarantee(G1CollectedHeap::heap()->mark_in_progress(),"Precondition.")
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parents:
1313
diff
changeset
|
3547 |
| 4710 | 3548 // We do not allow initial-mark to be piggy-backed on a mixed GC. |
|
3982
273b46400613
7086533: G1: assert(!_g1->is_obj_dead(obj)): We should not be preserving dead objs: g1CollectedHeap.cpp:3835
johnc
parents:
3980
diff
changeset
|
3549 assert(!g1_policy()->during_initial_mark_pause() || |
| 4710 | 3550 g1_policy()->gcs_are_young(), "sanity"); |
| 3551 | |
| 3552 // We also do not allow mixed GCs during marking. | |
| 3553 assert(!mark_in_progress() || g1_policy()->gcs_are_young(), "sanity"); | |
|
3982
273b46400613
7086533: G1: assert(!_g1->is_obj_dead(obj)): We should not be preserving dead objs: g1CollectedHeap.cpp:3835
johnc
parents:
3980
diff
changeset
|
3554 |
|
838
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
parents:
811
diff
changeset
|
3555 char verbose_str[128]; |
|
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
parents:
811
diff
changeset
|
3556 sprintf(verbose_str, "GC pause "); |
| 4710 | 3557 if (g1_policy()->gcs_are_young()) { |
|
3867
ff53346271fe
6814390: G1: remove the concept of non-generational G1
brutisso
parents:
3830
diff
changeset
|
3558 strcat(verbose_str, "(young)"); |
|
ff53346271fe
6814390: G1: remove the concept of non-generational G1
brutisso
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3830
diff
changeset
|
3559 } else { |
| 4710 | 3560 strcat(verbose_str, "(mixed)"); |
|
838
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
parents:
811
diff
changeset
|
3561 } |
|
1656
4e5661ba9d98
6944166: G1: explicit GCs are not always handled correctly
tonyp
parents:
1611
diff
changeset
|
3562 if (g1_policy()->during_initial_mark_pause()) { |
|
838
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
parents:
811
diff
changeset
|
3563 strcat(verbose_str, " (initial-mark)"); |
|
1656
4e5661ba9d98
6944166: G1: explicit GCs are not always handled correctly
tonyp
parents:
1611
diff
changeset
|
3564 // 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
|
3565 // full collection counter. |
|
4e5661ba9d98
6944166: G1: explicit GCs are not always handled correctly
tonyp
parents:
1611
diff
changeset
|
3566 increment_total_full_collections(); |
|
4e5661ba9d98
6944166: G1: explicit GCs are not always handled correctly
tonyp
parents:
1611
diff
changeset
|
3567 } |
|
838
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
parents:
811
diff
changeset
|
3568 |
|
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
parents:
811
diff
changeset
|
3569 // if PrintGCDetails is on, we'll print long statistics information |
|
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
parents:
811
diff
changeset
|
3570 // 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
|
3571 // is messy if we do. |
|
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
parents:
811
diff
changeset
|
3572 gclog_or_tty->date_stamp(PrintGC && PrintGCDateStamps); |
|
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
parents:
811
diff
changeset
|
3573 TraceCPUTime tcpu(PrintGCDetails, true, gclog_or_tty); |
|
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
parents:
811
diff
changeset
|
3574 TraceTime t(verbose_str, PrintGC && !PrintGCDetails, true, gclog_or_tty); |
|
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
parents:
811
diff
changeset
|
3575 |
|
3289
b52782ae3880
6946417: G1: Java VisualVM does not support G1 properly.
jmasa
parents:
3285
diff
changeset
|
3576 TraceCollectorStats tcs(g1mm()->incremental_collection_counters()); |
|
3356
78542e2b5e35
7036199: Adding a notification to the implementation of GarbageCollectorMXBeans
fparain
parents:
3323
diff
changeset
|
3577 TraceMemoryManagerStats tms(false /* fullGC */, gc_cause()); |
|
1089
db0d5eba9d20
6815790: G1: Missing MemoryPoolMXBeans with -XX:+UseG1GC
tonyp
parents:
1088
diff
changeset
|
3578 |
| 2361 | 3579 // If the secondary_free_list is not empty, append it to the |
| 3580 // free_list. No need to wait for the cleanup operation to finish; | |
| 3581 // the region allocation code will check the secondary_free_list | |
| 3582 // and wait if necessary. If the G1StressConcRegionFreeing flag is | |
| 3583 // set, skip this step so that the region allocation code has to | |
| 3584 // get entries from the secondary_free_list. | |
| 2152 | 3585 if (!G1StressConcRegionFreeing) { |
| 2361 | 3586 append_secondary_free_list_if_not_empty_with_lock(); |
| 2152 | 3587 } |
|
838
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
parents:
811
diff
changeset
|
3588 |
|
3867
ff53346271fe
6814390: G1: remove the concept of non-generational G1
brutisso
parents:
3830
diff
changeset
|
3589 assert(check_young_list_well_formed(), |
|
ff53346271fe
6814390: G1: remove the concept of non-generational G1
brutisso
parents:
3830
diff
changeset
|
3590 "young list should be well formed"); |
|
838
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
parents:
811
diff
changeset
|
3591 |
|
4095
bca17e38de00
6593758: RFE: Enhance GC ergonomics to dynamically choose ParallelGCThreads
jmasa
parents:
4090
diff
changeset
|
3592 // 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
|
3593 // 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
|
3594 // it will be set. |
|
bca17e38de00
6593758: RFE: Enhance GC ergonomics to dynamically choose ParallelGCThreads
jmasa
parents:
4090
diff
changeset
|
3595 |
|
838
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
parents:
811
diff
changeset
|
3596 { // 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
|
3597 IsGCActiveMark x; |
|
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
parents:
811
diff
changeset
|
3598 |
|
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
parents:
811
diff
changeset
|
3599 gc_prologue(false); |
|
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
parents:
811
diff
changeset
|
3600 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
|
3601 increment_gc_time_stamp(); |
| 342 | 3602 |
|
838
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
parents:
811
diff
changeset
|
3603 if (VerifyBeforeGC && total_collections() >= VerifyGCStartAt) { |
|
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
parents:
811
diff
changeset
|
3604 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
|
3605 gclog_or_tty->print(" VerifyBeforeGC:"); |
|
838
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
parents:
811
diff
changeset
|
3606 prepare_for_verify(); |
|
3772
6747fd0512e0
7004681: G1: Extend marking verification to Full GCs
johnc
parents:
3766
diff
changeset
|
3607 Universe::verify(/* allow dirty */ false, |
|
6747fd0512e0
7004681: G1: Extend marking verification to Full GCs
johnc
parents:
3766
diff
changeset
|
3608 /* silent */ false, |
|
6747fd0512e0
7004681: G1: Extend marking verification to Full GCs
johnc
parents:
3766
diff
changeset
|
3609 /* option */ VerifyOption_G1UsePrevMarking); |
|
6747fd0512e0
7004681: G1: Extend marking verification to Full GCs
johnc
parents:
3766
diff
changeset
|
3610 |
|
838
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
parents:
811
diff
changeset
|
3611 } |
|
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
parents:
811
diff
changeset
|
3612 |
|
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
parents:
811
diff
changeset
|
3613 COMPILER2_PRESENT(DerivedPointerTable::clear()); |
|
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
parents:
811
diff
changeset
|
3614 |
|
3979
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3615 // Please see comment in g1CollectedHeap.hpp and |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3616 // G1CollectedHeap::ref_processing_init() to see how |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3617 // reference processing currently works in G1. |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3618 |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3619 // Enable discovery in the STW reference processor |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3620 ref_processor_stw()->enable_discovery(true /*verify_disabled*/, |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3621 true /*verify_no_refs*/); |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3622 |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3623 { |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3624 // We want to temporarily turn off discovery by the |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3625 // CM ref processor, if necessary, and turn it back on |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3626 // on again later if we do. Using a scoped |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3627 // NoRefDiscovery object will do this. |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3628 NoRefDiscovery no_cm_discovery(ref_processor_cm()); |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3629 |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3630 // 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
|
3631 // of the collection set!). |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3632 release_mutator_alloc_region(); |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3633 |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3634 // We should call this after we retire the mutator alloc |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3635 // region(s) so that all the ALLOC / RETIRE events are generated |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3636 // before the start GC event. |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3637 _hr_printer.start_gc(false /* full */, (size_t) total_collections()); |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3638 |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3639 // The elapsed time induced by the start time below deliberately elides |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3640 // the possible verification above. |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3641 double start_time_sec = os::elapsedTime(); |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3642 size_t start_used_bytes = used(); |
|
838
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
parents:
811
diff
changeset
|
3643 |
|
1394
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
3644 #if YOUNG_LIST_VERBOSE |
|
3979
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3645 gclog_or_tty->print_cr("\nBefore recording pause start.\nYoung_list:"); |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3646 _young_list->print(); |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3647 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
|
3648 #endif // YOUNG_LIST_VERBOSE |
|
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
3649 |
|
3979
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3650 g1_policy()->record_collection_pause_start(start_time_sec, |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3651 start_used_bytes); |
|
838
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
parents:
811
diff
changeset
|
3652 |
|
1394
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
3653 #if YOUNG_LIST_VERBOSE |
|
3979
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3654 gclog_or_tty->print_cr("\nAfter recording pause start.\nYoung_list:"); |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3655 _young_list->print(); |
|
1394
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
3656 #endif // YOUNG_LIST_VERBOSE |
| 342 | 3657 |
|
3979
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3658 if (g1_policy()->during_initial_mark_pause()) { |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3659 concurrent_mark()->checkpointRootsInitialPre(); |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3660 } |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3661 perm_gen()->save_marks(); |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3662 |
|
1394
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
3663 #if YOUNG_LIST_VERBOSE |
|
3979
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3664 gclog_or_tty->print_cr("\nBefore choosing collection set.\nYoung_list:"); |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3665 _young_list->print(); |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3666 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
|
3667 #endif // YOUNG_LIST_VERBOSE |
|
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
3668 |
|
3979
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3669 g1_policy()->choose_collection_set(target_pause_time_ms); |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3670 |
|
4787
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
4785
diff
changeset
|
3671 _cm->note_start_of_gc(); |
|
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
4785
diff
changeset
|
3672 // 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
|
3673 // we have not filtered them yet (we'll do so during the |
|
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
4785
diff
changeset
|
3674 // GC). We also call this after choose_collection_set() to |
|
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
4785
diff
changeset
|
3675 // ensure that the CSet has been finalized. |
|
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
4785
diff
changeset
|
3676 _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
|
3677 true /* verify_enqueued_buffers */, |
|
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
4785
diff
changeset
|
3678 false /* verify_thread_buffers */, |
|
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
4785
diff
changeset
|
3679 true /* verify_fingers */); |
|
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
4785
diff
changeset
|
3680 |
|
3979
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3681 if (_hr_printer.is_active()) { |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3682 HeapRegion* hr = g1_policy()->collection_set(); |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3683 while (hr != NULL) { |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3684 G1HRPrinter::RegionType type; |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3685 if (!hr->is_young()) { |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3686 type = G1HRPrinter::Old; |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3687 } else if (hr->is_survivor()) { |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3688 type = G1HRPrinter::Survivor; |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3689 } else { |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3690 type = G1HRPrinter::Eden; |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3691 } |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3692 _hr_printer.cset(hr); |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3693 hr = hr->next_in_collection_set(); |
|
3778
5f6f2615433a
7049999: G1: Make the G1PrintHeapRegions output consistent and complete
tonyp
parents:
3777
diff
changeset
|
3694 } |
|
5f6f2615433a
7049999: G1: Make the G1PrintHeapRegions output consistent and complete
tonyp
parents:
3777
diff
changeset
|
3695 } |
|
3979
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3696 |
|
3777
e8b0b0392037
7046182: G1: remove unnecessary iterations over the collection set
tonyp
parents:
3774
diff
changeset
|
3697 #ifdef ASSERT |
|
3979
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3698 VerifyCSetClosure cl; |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3699 collection_set_iterate(&cl); |
|
3777
e8b0b0392037
7046182: G1: remove unnecessary iterations over the collection set
tonyp
parents:
3774
diff
changeset
|
3700 #endif // ASSERT |
| 1707 | 3701 |
|
3979
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3702 setup_surviving_young_words(); |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3703 |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3704 // Initialize the GC alloc regions. |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3705 init_gc_alloc_regions(); |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3706 |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3707 // Actually do the work... |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3708 evacuate_collection_set(); |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3709 |
|
4787
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
4785
diff
changeset
|
3710 // 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
|
3711 // (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
|
3712 // 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
|
3713 // 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
|
3714 // we checked. |
|
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
4785
diff
changeset
|
3715 _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
|
3716 false /* verify_enqueued_buffers */, |
|
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
4785
diff
changeset
|
3717 true /* verify_thread_buffers */, |
|
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
4785
diff
changeset
|
3718 true /* verify_fingers */); |
|
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
4785
diff
changeset
|
3719 |
|
3979
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3720 free_collection_set(g1_policy()->collection_set()); |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3721 g1_policy()->clear_collection_set(); |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3722 |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3723 cleanup_surviving_young_words(); |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3724 |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3725 // Start a new incremental collection set for the next pause. |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3726 g1_policy()->start_incremental_cset_building(); |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3727 |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3728 // Clear the _cset_fast_test bitmap in anticipation of adding |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3729 // regions to the incremental collection set for the next |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3730 // evacuation pause. |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3731 clear_cset_fast_test(); |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3732 |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3733 _young_list->reset_sampled_info(); |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3734 |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3735 // Don't check the whole heap at this point as the |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3736 // GC alloc regions from this pause have been tagged |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3737 // as survivors and moved on to the survivor list. |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3738 // Survivor regions will fail the !is_young() check. |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3739 assert(check_young_list_empty(false /* check_heap */), |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3740 "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
|
3741 |
|
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
3742 #if YOUNG_LIST_VERBOSE |
|
3979
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3743 gclog_or_tty->print_cr("Before recording survivors.\nYoung List:"); |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3744 _young_list->print(); |
|
1394
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
3745 #endif // YOUNG_LIST_VERBOSE |
| 342 | 3746 |
|
3979
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3747 g1_policy()->record_survivor_regions(_young_list->survivor_length(), |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3748 _young_list->first_survivor_region(), |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3749 _young_list->last_survivor_region()); |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3750 |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3751 _young_list->reset_auxilary_lists(); |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3752 |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3753 if (evacuation_failed()) { |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3754 _summary_bytes_used = recalculate_used(); |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3755 } else { |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3756 // The "used" of the the collection set have already been subtracted |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3757 // when they were freed. Add in the bytes evacuated. |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3758 _summary_bytes_used += g1_policy()->bytes_copied_during_gc(); |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3759 } |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3760 |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3761 if (g1_policy()->during_initial_mark_pause()) { |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3762 concurrent_mark()->checkpointRootsInitialPost(); |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3763 set_marking_started(); |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3764 // CAUTION: after the doConcurrentMark() call below, |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3765 // the concurrent marking thread(s) could be running |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3766 // concurrently with us. Make sure that anything after |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3767 // this point does not assume that we are the only GC thread |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3768 // running. Note: of course, the actual marking work will |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3769 // not start until the safepoint itself is released in |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3770 // ConcurrentGCThread::safepoint_desynchronize(). |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3771 doConcurrentMark(); |
|
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 |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3774 allocate_dummy_regions(); |
|
3285
49a67202bc67
7011855: G1: non-product flag to artificially grow the heap
tonyp
parents:
2433
diff
changeset
|
3775 |
|
1394
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
3776 #if YOUNG_LIST_VERBOSE |
|
3979
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3777 gclog_or_tty->print_cr("\nEnd of the pause.\nYoung_list:"); |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3778 _young_list->print(); |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3779 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
|
3780 #endif // YOUNG_LIST_VERBOSE |
| 342 | 3781 |
|
3979
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3782 init_mutator_alloc_region(); |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3783 |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3784 { |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3785 size_t expand_bytes = g1_policy()->expansion_amount(); |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3786 if (expand_bytes > 0) { |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3787 size_t bytes_before = capacity(); |
| 4785 | 3788 // No need for an ergo verbose message here, |
| 3789 // expansion_amount() does this when it returns a value > 0. | |
|
3979
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3790 if (!expand(expand_bytes)) { |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3791 // We failed to expand the heap so let's verify that |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3792 // committed/uncommitted amount match the backing store |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3793 assert(capacity() == _g1_storage.committed_size(), "committed size mismatch"); |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3794 assert(max_capacity() == _g1_storage.reserved_size(), "reserved size mismatch"); |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3795 } |
|
3920
af2ab04e0038
6929868: G1: introduce min / max young gen size bounds
brutisso
parents:
3919
diff
changeset
|
3796 } |
|
af2ab04e0038
6929868: G1: introduce min / max young gen size bounds
brutisso
parents:
3919
diff
changeset
|
3797 } |
|
3979
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3798 |
|
4787
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
4785
diff
changeset
|
3799 // 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
|
3800 // 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
|
3801 _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
|
3802 true /* verify_enqueued_buffers */, |
|
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
4785
diff
changeset
|
3803 true /* verify_thread_buffers */, |
|
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
4785
diff
changeset
|
3804 true /* verify_fingers */); |
|
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
4785
diff
changeset
|
3805 _cm->note_end_of_gc(); |
|
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
4785
diff
changeset
|
3806 |
|
3979
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3807 double end_time_sec = os::elapsedTime(); |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3808 double pause_time_ms = (end_time_sec - start_time_sec) * MILLIUNITS; |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3809 g1_policy()->record_pause_time_ms(pause_time_ms); |
| 4711 | 3810 int active_workers = (G1CollectedHeap::use_parallel_gc_threads() ? |
| 3811 workers()->active_workers() : 1); | |
| 3812 g1_policy()->record_collection_pause_end(active_workers); | |
|
3979
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3813 |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3814 MemoryService::track_memory_usage(); |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3815 |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3816 // In prepare_for_verify() below we'll need to scan the deferred |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3817 // update buffers to bring the RSets up-to-date if |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3818 // G1HRRSFlushLogBuffersOnVerify has been set. While scanning |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3819 // the update buffers we'll probably need to scan cards on the |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3820 // regions we just allocated to (i.e., the GC alloc |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3821 // regions). However, during the last GC we called |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3822 // set_saved_mark() on all the GC alloc regions, so card |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3823 // scanning might skip the [saved_mark_word()...top()] area of |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3824 // those regions (i.e., the area we allocated objects into |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3825 // during the last GC). But it shouldn't. Given that |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3826 // saved_mark_word() is conditional on whether the GC time stamp |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3827 // on the region is current or not, by incrementing the GC time |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3828 // stamp here we invalidate all the GC time stamps on all the |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3829 // regions and saved_mark_word() will simply return top() for |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3830 // all the regions. This is a nicer way of ensuring this rather |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3831 // than iterating over the regions and fixing them. In fact, the |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3832 // GC time stamp increment here also ensures that |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3833 // saved_mark_word() will return top() between pauses, i.e., |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3834 // during concurrent refinement. So we don't need the |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3835 // is_gc_active() check to decided which top to use when |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3836 // scanning cards (see CR 7039627). |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3837 increment_gc_time_stamp(); |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3838 |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3839 if (VerifyAfterGC && total_collections() >= VerifyGCStartAt) { |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3840 HandleMark hm; // Discard invalid handles created during verification |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3841 gclog_or_tty->print(" VerifyAfterGC:"); |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3842 prepare_for_verify(); |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3843 Universe::verify(/* allow dirty */ true, |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3844 /* silent */ false, |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3845 /* option */ VerifyOption_G1UsePrevMarking); |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3846 } |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3847 |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3848 assert(!ref_processor_stw()->discovery_enabled(), "Postcondition"); |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3849 ref_processor_stw()->verify_no_references_recorded(); |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3850 |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3851 // CM reference discovery will be re-enabled if necessary. |
|
3920
af2ab04e0038
6929868: G1: introduce min / max young gen size bounds
brutisso
parents:
3919
diff
changeset
|
3852 } |
|
af2ab04e0038
6929868: G1: introduce min / max young gen size bounds
brutisso
parents:
3919
diff
changeset
|
3853 |
|
3778
5f6f2615433a
7049999: G1: Make the G1PrintHeapRegions output consistent and complete
tonyp
parents:
3777
diff
changeset
|
3854 // We should do this after we potentially expand the heap so |
|
5f6f2615433a
7049999: G1: Make the G1PrintHeapRegions output consistent and complete
tonyp
parents:
3777
diff
changeset
|
3855 // that all the COMMIT events are generated before the end GC |
|
5f6f2615433a
7049999: G1: Make the G1PrintHeapRegions output consistent and complete
tonyp
parents:
3777
diff
changeset
|
3856 // event, and after we retire the GC alloc regions so that all |
|
5f6f2615433a
7049999: G1: Make the G1PrintHeapRegions output consistent and complete
tonyp
parents:
3777
diff
changeset
|
3857 // RETIRE events are generated before the end GC event. |
|
5f6f2615433a
7049999: G1: Make the G1PrintHeapRegions output consistent and complete
tonyp
parents:
3777
diff
changeset
|
3858 _hr_printer.end_gc(false /* full */, (size_t) total_collections()); |
|
5f6f2615433a
7049999: G1: Make the G1PrintHeapRegions output consistent and complete
tonyp
parents:
3777
diff
changeset
|
3859 |
|
3764
053d84a76d3d
7032531: G1: enhance GC logging to include more accurate eden / survivor size transitions
tonyp
parents:
3378
diff
changeset
|
3860 // We have to do this after we decide whether to expand the heap or not. |
|
053d84a76d3d
7032531: G1: enhance GC logging to include more accurate eden / survivor size transitions
tonyp
parents:
3378
diff
changeset
|
3861 g1_policy()->print_heap_transition(); |
|
838
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
parents:
811
diff
changeset
|
3862 |
|
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
parents:
811
diff
changeset
|
3863 if (mark_in_progress()) { |
|
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
parents:
811
diff
changeset
|
3864 concurrent_mark()->update_g1_committed(); |
|
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
parents:
811
diff
changeset
|
3865 } |
|
546
05c6d52fa7a9
6690928: Use spinning in combination with yields for workstealing termination.
jmasa
parents:
545
diff
changeset
|
3866 |
|
05c6d52fa7a9
6690928: Use spinning in combination with yields for workstealing termination.
jmasa
parents:
545
diff
changeset
|
3867 #ifdef TRACESPINNING |
|
838
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
parents:
811
diff
changeset
|
3868 ParallelTaskTerminator::print_termination_counts(); |
|
546
05c6d52fa7a9
6690928: Use spinning in combination with yields for workstealing termination.
jmasa
parents:
545
diff
changeset
|
3869 #endif |
| 342 | 3870 |
|
838
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
parents:
811
diff
changeset
|
3871 gc_epilogue(false); |
|
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
parents:
811
diff
changeset
|
3872 } |
|
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
parents:
811
diff
changeset
|
3873 |
|
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
parents:
811
diff
changeset
|
3874 if (ExitAfterGCNum > 0 && total_collections() == ExitAfterGCNum) { |
|
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
parents:
811
diff
changeset
|
3875 gclog_or_tty->print_cr("Stopping after GC #%d", ExitAfterGCNum); |
|
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
parents:
811
diff
changeset
|
3876 print_tracing_info(); |
|
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
parents:
811
diff
changeset
|
3877 vm_exit(-1); |
|
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
parents:
811
diff
changeset
|
3878 } |
|
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
parents:
811
diff
changeset
|
3879 } |
|
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
parents:
811
diff
changeset
|
3880 |
| 3766 | 3881 _hrs.verify_optional(); |
| 2152 | 3882 verify_region_sets_optional(); |
| 3883 | |
| 1709 | 3884 TASKQUEUE_STATS_ONLY(if (ParallelGCVerbose) print_taskqueue_stats()); |
| 3885 TASKQUEUE_STATS_ONLY(reset_taskqueue_stats()); | |
| 3886 | |
|
4872
aa3d708d67c4
7141200: log some interesting information in ring buffers for crashes
never
parents:
4787
diff
changeset
|
3887 print_heap_after_gc(); |
|
3980
8229bd737950
7075646: G1: fix inconsistencies in the monitoring data
tonyp
parents:
3979
diff
changeset
|
3888 g1mm()->update_sizes(); |
|
3289
b52782ae3880
6946417: G1: Java VisualVM does not support G1 properly.
jmasa
parents:
3285
diff
changeset
|
3889 |
|
884
83b687ce3090
6866591: G1: print update buffer processing stats more often
tonyp
parents:
883
diff
changeset
|
3890 if (G1SummarizeRSetStats && |
|
83b687ce3090
6866591: G1: print update buffer processing stats more often
tonyp
parents:
883
diff
changeset
|
3891 (G1SummarizeRSetStatsPeriod > 0) && |
|
83b687ce3090
6866591: G1: print update buffer processing stats more often
tonyp
parents:
883
diff
changeset
|
3892 (total_collections() % G1SummarizeRSetStatsPeriod == 0)) { |
|
83b687ce3090
6866591: G1: print update buffer processing stats more often
tonyp
parents:
883
diff
changeset
|
3893 g1_rem_set()->print_summary_info(); |
|
83b687ce3090
6866591: G1: print update buffer processing stats more often
tonyp
parents:
883
diff
changeset
|
3894 } |
| 1973 | 3895 |
| 3896 return true; | |
| 342 | 3897 } |
| 3898 | |
|
1391
79e419e5ea3b
6942253: G1: replace G1ParallelGCAllocBufferSize with YoungPLABSize and OldPLABSize
apetrusenko
parents:
1390
diff
changeset
|
3899 size_t G1CollectedHeap::desired_plab_sz(GCAllocPurpose purpose) |
|
79e419e5ea3b
6942253: G1: replace G1ParallelGCAllocBufferSize with YoungPLABSize and OldPLABSize
apetrusenko
parents:
1390
diff
changeset
|
3900 { |
|
79e419e5ea3b
6942253: G1: replace G1ParallelGCAllocBufferSize with YoungPLABSize and OldPLABSize
apetrusenko
parents:
1390
diff
changeset
|
3901 size_t gclab_word_size; |
|
79e419e5ea3b
6942253: G1: replace G1ParallelGCAllocBufferSize with YoungPLABSize and OldPLABSize
apetrusenko
parents:
1390
diff
changeset
|
3902 switch (purpose) { |
|
79e419e5ea3b
6942253: G1: replace G1ParallelGCAllocBufferSize with YoungPLABSize and OldPLABSize
apetrusenko
parents:
1390
diff
changeset
|
3903 case GCAllocForSurvived: |
|
79e419e5ea3b
6942253: G1: replace G1ParallelGCAllocBufferSize with YoungPLABSize and OldPLABSize
apetrusenko
parents:
1390
diff
changeset
|
3904 gclab_word_size = YoungPLABSize; |
|
79e419e5ea3b
6942253: G1: replace G1ParallelGCAllocBufferSize with YoungPLABSize and OldPLABSize
apetrusenko
parents:
1390
diff
changeset
|
3905 break; |
|
79e419e5ea3b
6942253: G1: replace G1ParallelGCAllocBufferSize with YoungPLABSize and OldPLABSize
apetrusenko
parents:
1390
diff
changeset
|
3906 case GCAllocForTenured: |
|
79e419e5ea3b
6942253: G1: replace G1ParallelGCAllocBufferSize with YoungPLABSize and OldPLABSize
apetrusenko
parents:
1390
diff
changeset
|
3907 gclab_word_size = OldPLABSize; |
|
79e419e5ea3b
6942253: G1: replace G1ParallelGCAllocBufferSize with YoungPLABSize and OldPLABSize
apetrusenko
parents:
1390
diff
changeset
|
3908 break; |
|
79e419e5ea3b
6942253: G1: replace G1ParallelGCAllocBufferSize with YoungPLABSize and OldPLABSize
apetrusenko
parents:
1390
diff
changeset
|
3909 default: |
|
79e419e5ea3b
6942253: G1: replace G1ParallelGCAllocBufferSize with YoungPLABSize and OldPLABSize
apetrusenko
parents:
1390
diff
changeset
|
3910 assert(false, "unknown GCAllocPurpose"); |
|
79e419e5ea3b
6942253: G1: replace G1ParallelGCAllocBufferSize with YoungPLABSize and OldPLABSize
apetrusenko
parents:
1390
diff
changeset
|
3911 gclab_word_size = OldPLABSize; |
|
79e419e5ea3b
6942253: G1: replace G1ParallelGCAllocBufferSize with YoungPLABSize and OldPLABSize
apetrusenko
parents:
1390
diff
changeset
|
3912 break; |
|
79e419e5ea3b
6942253: G1: replace G1ParallelGCAllocBufferSize with YoungPLABSize and OldPLABSize
apetrusenko
parents:
1390
diff
changeset
|
3913 } |
|
79e419e5ea3b
6942253: G1: replace G1ParallelGCAllocBufferSize with YoungPLABSize and OldPLABSize
apetrusenko
parents:
1390
diff
changeset
|
3914 return gclab_word_size; |
|
79e419e5ea3b
6942253: G1: replace G1ParallelGCAllocBufferSize with YoungPLABSize and OldPLABSize
apetrusenko
parents:
1390
diff
changeset
|
3915 } |
|
79e419e5ea3b
6942253: G1: replace G1ParallelGCAllocBufferSize with YoungPLABSize and OldPLABSize
apetrusenko
parents:
1390
diff
changeset
|
3916 |
|
2433
abdfc822206f
7023069: G1: Introduce symmetric locking in the slow allocation path
tonyp
parents:
2432
diff
changeset
|
3917 void G1CollectedHeap::init_mutator_alloc_region() { |
|
abdfc822206f
7023069: G1: Introduce symmetric locking in the slow allocation path
tonyp
parents:
2432
diff
changeset
|
3918 assert(_mutator_alloc_region.get() == NULL, "pre-condition"); |
|
abdfc822206f
7023069: G1: Introduce symmetric locking in the slow allocation path
tonyp
parents:
2432
diff
changeset
|
3919 _mutator_alloc_region.init(); |
|
abdfc822206f
7023069: G1: Introduce symmetric locking in the slow allocation path
tonyp
parents:
2432
diff
changeset
|
3920 } |
|
abdfc822206f
7023069: G1: Introduce symmetric locking in the slow allocation path
tonyp
parents:
2432
diff
changeset
|
3921 |
|
abdfc822206f
7023069: G1: Introduce symmetric locking in the slow allocation path
tonyp
parents:
2432
diff
changeset
|
3922 void G1CollectedHeap::release_mutator_alloc_region() { |
|
abdfc822206f
7023069: G1: Introduce symmetric locking in the slow allocation path
tonyp
parents:
2432
diff
changeset
|
3923 _mutator_alloc_region.release(); |
|
abdfc822206f
7023069: G1: Introduce symmetric locking in the slow allocation path
tonyp
parents:
2432
diff
changeset
|
3924 assert(_mutator_alloc_region.get() == NULL, "post-condition"); |
|
abdfc822206f
7023069: G1: Introduce symmetric locking in the slow allocation path
tonyp
parents:
2432
diff
changeset
|
3925 } |
|
1391
79e419e5ea3b
6942253: G1: replace G1ParallelGCAllocBufferSize with YoungPLABSize and OldPLABSize
apetrusenko
parents:
1390
diff
changeset
|
3926 |
|
3830
f44782f04dd4
7039627: G1: avoid BOT updates for survivor allocations and dirty survivor regions incrementally
tonyp
parents:
3824
diff
changeset
|
3927 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
|
3928 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
|
3929 |
|
f44782f04dd4
7039627: G1: avoid BOT updates for survivor allocations and dirty survivor regions incrementally
tonyp
parents:
3824
diff
changeset
|
3930 _survivor_gc_alloc_region.init(); |
|
f44782f04dd4
7039627: G1: avoid BOT updates for survivor allocations and dirty survivor regions incrementally
tonyp
parents:
3824
diff
changeset
|
3931 _old_gc_alloc_region.init(); |
|
f44782f04dd4
7039627: G1: avoid BOT updates for survivor allocations and dirty survivor regions incrementally
tonyp
parents:
3824
diff
changeset
|
3932 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
|
3933 _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
|
3934 |
|
f44782f04dd4
7039627: G1: avoid BOT updates for survivor allocations and dirty survivor regions incrementally
tonyp
parents:
3824
diff
changeset
|
3935 // 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
|
3936 // 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
|
3937 // 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
|
3938 // 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
|
3939 // 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
|
3940 // 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
|
3941 // 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
|
3942 // 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
|
3943 // 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
|
3944 if (retained_region != NULL && |
|
f44782f04dd4
7039627: G1: avoid BOT updates for survivor allocations and dirty survivor regions incrementally
tonyp
parents:
3824
diff
changeset
|
3945 !retained_region->in_collection_set() && |
|
f44782f04dd4
7039627: G1: avoid BOT updates for survivor allocations and dirty survivor regions incrementally
tonyp
parents:
3824
diff
changeset
|
3946 !(retained_region->top() == retained_region->end()) && |
|
f44782f04dd4
7039627: G1: avoid BOT updates for survivor allocations and dirty survivor regions incrementally
tonyp
parents:
3824
diff
changeset
|
3947 !retained_region->is_empty() && |
|
f44782f04dd4
7039627: G1: avoid BOT updates for survivor allocations and dirty survivor regions incrementally
tonyp
parents:
3824
diff
changeset
|
3948 !retained_region->isHumongous()) { |
|
f44782f04dd4
7039627: G1: avoid BOT updates for survivor allocations and dirty survivor regions incrementally
tonyp
parents:
3824
diff
changeset
|
3949 retained_region->set_saved_mark(); |
| 4072 | 3950 // The retained region was added to the old region set when it was |
| 3951 // retired. We have to remove it now, since we don't allow regions | |
| 3952 // we allocate to in the region sets. We'll re-add it later, when | |
| 3953 // it's retired again. | |
| 3954 _old_set.remove(retained_region); | |
|
4787
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
4785
diff
changeset
|
3955 bool during_im = g1_policy()->during_initial_mark_pause(); |
|
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
4785
diff
changeset
|
3956 retained_region->note_start_of_copying(during_im); |
|
3830
f44782f04dd4
7039627: G1: avoid BOT updates for survivor allocations and dirty survivor regions incrementally
tonyp
parents:
3824
diff
changeset
|
3957 _old_gc_alloc_region.set(retained_region); |
|
f44782f04dd4
7039627: G1: avoid BOT updates for survivor allocations and dirty survivor regions incrementally
tonyp
parents:
3824
diff
changeset
|
3958 _hr_printer.reuse(retained_region); |
| 342 | 3959 } |
| 3960 } | |
| 3961 | |
|
3830
f44782f04dd4
7039627: G1: avoid BOT updates for survivor allocations and dirty survivor regions incrementally
tonyp
parents:
3824
diff
changeset
|
3962 void G1CollectedHeap::release_gc_alloc_regions() { |
|
f44782f04dd4
7039627: G1: avoid BOT updates for survivor allocations and dirty survivor regions incrementally
tonyp
parents:
3824
diff
changeset
|
3963 _survivor_gc_alloc_region.release(); |
|
f44782f04dd4
7039627: G1: avoid BOT updates for survivor allocations and dirty survivor regions incrementally
tonyp
parents:
3824
diff
changeset
|
3964 // If we have an old GC alloc region to release, we'll save it in |
|
f44782f04dd4
7039627: G1: avoid BOT updates for survivor allocations and dirty survivor regions incrementally
tonyp
parents:
3824
diff
changeset
|
3965 // _retained_old_gc_alloc_region. If we don't |
|
f44782f04dd4
7039627: G1: avoid BOT updates for survivor allocations and dirty survivor regions incrementally
tonyp
parents:
3824
diff
changeset
|
3966 // _retained_old_gc_alloc_region will become NULL. This is what we |
|
f44782f04dd4
7039627: G1: avoid BOT updates for survivor allocations and dirty survivor regions incrementally
tonyp
parents:
3824
diff
changeset
|
3967 // want either way so no reason to check explicitly for either |
|
f44782f04dd4
7039627: G1: avoid BOT updates for survivor allocations and dirty survivor regions incrementally
tonyp
parents:
3824
diff
changeset
|
3968 // condition. |
|
f44782f04dd4
7039627: G1: avoid BOT updates for survivor allocations and dirty survivor regions incrementally
tonyp
parents:
3824
diff
changeset
|
3969 _retained_old_gc_alloc_region = _old_gc_alloc_region.release(); |
| 342 | 3970 } |
| 3971 | |
|
3830
f44782f04dd4
7039627: G1: avoid BOT updates for survivor allocations and dirty survivor regions incrementally
tonyp
parents:
3824
diff
changeset
|
3972 void G1CollectedHeap::abandon_gc_alloc_regions() { |
|
f44782f04dd4
7039627: G1: avoid BOT updates for survivor allocations and dirty survivor regions incrementally
tonyp
parents:
3824
diff
changeset
|
3973 assert(_survivor_gc_alloc_region.get() == NULL, "pre-condition"); |
|
f44782f04dd4
7039627: G1: avoid BOT updates for survivor allocations and dirty survivor regions incrementally
tonyp
parents:
3824
diff
changeset
|
3974 assert(_old_gc_alloc_region.get() == NULL, "pre-condition"); |
|
f44782f04dd4
7039627: G1: avoid BOT updates for survivor allocations and dirty survivor regions incrementally
tonyp
parents:
3824
diff
changeset
|
3975 _retained_old_gc_alloc_region = NULL; |
| 342 | 3976 } |
| 3977 | |
| 3978 void G1CollectedHeap::init_for_evac_failure(OopsInHeapRegionClosure* cl) { | |
| 3979 _drain_in_progress = false; | |
| 3980 set_evac_failure_closure(cl); | |
| 3981 _evac_failure_scan_stack = new (ResourceObj::C_HEAP) GrowableArray<oop>(40, true); | |
| 3982 } | |
| 3983 | |
| 3984 void G1CollectedHeap::finalize_for_evac_failure() { | |
| 3985 assert(_evac_failure_scan_stack != NULL && | |
| 3986 _evac_failure_scan_stack->length() == 0, | |
| 3987 "Postcondition"); | |
| 3988 assert(!_drain_in_progress, "Postcondition"); | |
| 1045 | 3989 delete _evac_failure_scan_stack; |
| 342 | 3990 _evac_failure_scan_stack = NULL; |
| 3991 } | |
| 3992 | |
| 3993 void G1CollectedHeap::remove_self_forwarding_pointers() { | |
|
4783
023652e49ac0
7121496: G1: do the per-region evacuation failure handling work in parallel
johnc
parents:
4781
diff
changeset
|
3994 assert(check_cset_heap_region_claim_values(HeapRegion::InitialClaimValue), "sanity"); |
|
023652e49ac0
7121496: G1: do the per-region evacuation failure handling work in parallel
johnc
parents:
4781
diff
changeset
|
3995 assert(g1_policy()->assertMarkedBytesDataOK(), "Should be!"); |
|
023652e49ac0
7121496: G1: do the per-region evacuation failure handling work in parallel
johnc
parents:
4781
diff
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|
3996 |
|
023652e49ac0
7121496: G1: do the per-region evacuation failure handling work in parallel
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4781
diff
changeset
|
3997 G1ParRemoveSelfForwardPtrsTask rsfp_task(this); |
|
023652e49ac0
7121496: G1: do the per-region evacuation failure handling work in parallel
johnc
parents:
4781
diff
changeset
|
3998 |
|
023652e49ac0
7121496: G1: do the per-region evacuation failure handling work in parallel
johnc
parents:
4781
diff
changeset
|
3999 if (G1CollectedHeap::use_parallel_gc_threads()) { |
|
023652e49ac0
7121496: G1: do the per-region evacuation failure handling work in parallel
johnc
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4781
diff
changeset
|
4000 set_par_threads(); |
|
023652e49ac0
7121496: G1: do the per-region evacuation failure handling work in parallel
johnc
parents:
4781
diff
changeset
|
4001 workers()->run_task(&rsfp_task); |
|
023652e49ac0
7121496: G1: do the per-region evacuation failure handling work in parallel
johnc
parents:
4781
diff
changeset
|
4002 set_par_threads(0); |
|
616
4f360ec815ba
6720309: G1: don't synchronously update RSet during evacuation pauses
iveresov
parents:
595
diff
changeset
|
4003 } else { |
|
4783
023652e49ac0
7121496: G1: do the per-region evacuation failure handling work in parallel
johnc
parents:
4781
diff
changeset
|
4004 rsfp_task.work(0); |
|
023652e49ac0
7121496: G1: do the per-region evacuation failure handling work in parallel
johnc
parents:
4781
diff
changeset
|
4005 } |
|
023652e49ac0
7121496: G1: do the per-region evacuation failure handling work in parallel
johnc
parents:
4781
diff
changeset
|
4006 |
|
023652e49ac0
7121496: G1: do the per-region evacuation failure handling work in parallel
johnc
parents:
4781
diff
changeset
|
4007 assert(check_cset_heap_region_claim_values(HeapRegion::ParEvacFailureClaimValue), "sanity"); |
|
023652e49ac0
7121496: G1: do the per-region evacuation failure handling work in parallel
johnc
parents:
4781
diff
changeset
|
4008 |
|
023652e49ac0
7121496: G1: do the per-region evacuation failure handling work in parallel
johnc
parents:
4781
diff
changeset
|
4009 // Reset the claim values in the regions in the collection set. |
|
023652e49ac0
7121496: G1: do the per-region evacuation failure handling work in parallel
johnc
parents:
4781
diff
changeset
|
4010 reset_cset_heap_region_claim_values(); |
|
023652e49ac0
7121496: G1: do the per-region evacuation failure handling work in parallel
johnc
parents:
4781
diff
changeset
|
4011 |
|
023652e49ac0
7121496: G1: do the per-region evacuation failure handling work in parallel
johnc
parents:
4781
diff
changeset
|
4012 assert(check_cset_heap_region_claim_values(HeapRegion::InitialClaimValue), "sanity"); |
| 342 | 4013 assert(g1_policy()->assertMarkedBytesDataOK(), "Should be!"); |
| 4014 | |
| 4015 // Now restore saved marks, if any. | |
| 4016 if (_objs_with_preserved_marks != NULL) { | |
| 4017 assert(_preserved_marks_of_objs != NULL, "Both or none."); | |
| 4018 guarantee(_objs_with_preserved_marks->length() == | |
| 4019 _preserved_marks_of_objs->length(), "Both or none."); | |
| 4020 for (int i = 0; i < _objs_with_preserved_marks->length(); i++) { | |
| 4021 oop obj = _objs_with_preserved_marks->at(i); | |
| 4022 markOop m = _preserved_marks_of_objs->at(i); | |
| 4023 obj->set_mark(m); | |
| 4024 } | |
|
4783
023652e49ac0
7121496: G1: do the per-region evacuation failure handling work in parallel
johnc
parents:
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diff
changeset
|
4025 |
| 342 | 4026 // Delete the preserved marks growable arrays (allocated on the C heap). |
| 4027 delete _objs_with_preserved_marks; | |
| 4028 delete _preserved_marks_of_objs; | |
| 4029 _objs_with_preserved_marks = NULL; | |
| 4030 _preserved_marks_of_objs = NULL; | |
| 4031 } | |
| 4032 } | |
| 4033 | |
| 4034 void G1CollectedHeap::push_on_evac_failure_scan_stack(oop obj) { | |
| 4035 _evac_failure_scan_stack->push(obj); | |
| 4036 } | |
| 4037 | |
| 4038 void G1CollectedHeap::drain_evac_failure_scan_stack() { | |
| 4039 assert(_evac_failure_scan_stack != NULL, "precondition"); | |
| 4040 | |
| 4041 while (_evac_failure_scan_stack->length() > 0) { | |
| 4042 oop obj = _evac_failure_scan_stack->pop(); | |
| 4043 _evac_failure_closure->set_region(heap_region_containing(obj)); | |
| 4044 obj->oop_iterate_backwards(_evac_failure_closure); | |
| 4045 } | |
| 4046 } | |
| 4047 | |
| 4048 oop | |
| 4049 G1CollectedHeap::handle_evacuation_failure_par(OopsInHeapRegionClosure* cl, | |
|
4787
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
4785
diff
changeset
|
4050 oop old) { |
|
3323
75af3e8de182
7040450: G1: assert((_g1->evacuation_failed()) || (!_g1->obj_in_cs(obj))) failed: shouldn't still be in ...
tonyp
parents:
3317
diff
changeset
|
4051 assert(obj_in_cs(old), |
|
75af3e8de182
7040450: G1: assert((_g1->evacuation_failed()) || (!_g1->obj_in_cs(obj))) failed: shouldn't still be in ...
tonyp
parents:
3317
diff
changeset
|
4052 err_msg("obj: "PTR_FORMAT" should still be in the CSet", |
|
75af3e8de182
7040450: G1: assert((_g1->evacuation_failed()) || (!_g1->obj_in_cs(obj))) failed: shouldn't still be in ...
tonyp
parents:
3317
diff
changeset
|
4053 (HeapWord*) old)); |
| 342 | 4054 markOop m = old->mark(); |
| 4055 oop forward_ptr = old->forward_to_atomic(old); | |
| 4056 if (forward_ptr == NULL) { | |
| 4057 // Forward-to-self succeeded. | |
|
3973
663cb89032b1
7092412: G1: Some roots not marked during an initial mark that gets an evacuation failure
johnc
parents:
3920
diff
changeset
|
4058 |
| 342 | 4059 if (_evac_failure_closure != cl) { |
| 4060 MutexLockerEx x(EvacFailureStack_lock, Mutex::_no_safepoint_check_flag); | |
| 4061 assert(!_drain_in_progress, | |
| 4062 "Should only be true while someone holds the lock."); | |
| 4063 // Set the global evac-failure closure to the current thread's. | |
| 4064 assert(_evac_failure_closure == NULL, "Or locking has failed."); | |
| 4065 set_evac_failure_closure(cl); | |
| 4066 // Now do the common part. | |
| 4067 handle_evacuation_failure_common(old, m); | |
| 4068 // Reset to NULL. | |
| 4069 set_evac_failure_closure(NULL); | |
| 4070 } else { | |
| 4071 // The lock is already held, and this is recursive. | |
| 4072 assert(_drain_in_progress, "This should only be the recursive case."); | |
| 4073 handle_evacuation_failure_common(old, m); | |
| 4074 } | |
| 4075 return old; | |
| 4076 } else { | |
|
3323
75af3e8de182
7040450: G1: assert((_g1->evacuation_failed()) || (!_g1->obj_in_cs(obj))) failed: shouldn't still be in ...
tonyp
parents:
3317
diff
changeset
|
4077 // Forward-to-self failed. Either someone else managed to allocate |
|
75af3e8de182
7040450: G1: assert((_g1->evacuation_failed()) || (!_g1->obj_in_cs(obj))) failed: shouldn't still be in ...
tonyp
parents:
3317
diff
changeset
|
4078 // space for this object (old != forward_ptr) or they beat us in |
|
75af3e8de182
7040450: G1: assert((_g1->evacuation_failed()) || (!_g1->obj_in_cs(obj))) failed: shouldn't still be in ...
tonyp
parents:
3317
diff
changeset
|
4079 // self-forwarding it (old == forward_ptr). |
|
75af3e8de182
7040450: G1: assert((_g1->evacuation_failed()) || (!_g1->obj_in_cs(obj))) failed: shouldn't still be in ...
tonyp
parents:
3317
diff
changeset
|
4080 assert(old == forward_ptr || !obj_in_cs(forward_ptr), |
|
75af3e8de182
7040450: G1: assert((_g1->evacuation_failed()) || (!_g1->obj_in_cs(obj))) failed: shouldn't still be in ...
tonyp
parents:
3317
diff
changeset
|
4081 err_msg("obj: "PTR_FORMAT" forwarded to: "PTR_FORMAT" " |
|
75af3e8de182
7040450: G1: assert((_g1->evacuation_failed()) || (!_g1->obj_in_cs(obj))) failed: shouldn't still be in ...
tonyp
parents:
3317
diff
changeset
|
4082 "should not be in the CSet", |
|
75af3e8de182
7040450: G1: assert((_g1->evacuation_failed()) || (!_g1->obj_in_cs(obj))) failed: shouldn't still be in ...
tonyp
parents:
3317
diff
changeset
|
4083 (HeapWord*) old, (HeapWord*) forward_ptr)); |
| 342 | 4084 return forward_ptr; |
| 4085 } | |
| 4086 } | |
| 4087 | |
| 4088 void G1CollectedHeap::handle_evacuation_failure_common(oop old, markOop m) { | |
| 4089 set_evacuation_failed(true); | |
| 4090 | |
| 4091 preserve_mark_if_necessary(old, m); | |
| 4092 | |
| 4093 HeapRegion* r = heap_region_containing(old); | |
| 4094 if (!r->evacuation_failed()) { | |
| 4095 r->set_evacuation_failed(true); | |
|
3778
5f6f2615433a
7049999: G1: Make the G1PrintHeapRegions output consistent and complete
tonyp
parents:
3777
diff
changeset
|
4096 _hr_printer.evac_failure(r); |
| 342 | 4097 } |
| 4098 | |
| 4099 push_on_evac_failure_scan_stack(old); | |
| 4100 | |
| 4101 if (!_drain_in_progress) { | |
| 4102 // prevent recursion in copy_to_survivor_space() | |
| 4103 _drain_in_progress = true; | |
| 4104 drain_evac_failure_scan_stack(); | |
| 4105 _drain_in_progress = false; | |
| 4106 } | |
| 4107 } | |
| 4108 | |
| 4109 void G1CollectedHeap::preserve_mark_if_necessary(oop obj, markOop m) { | |
|
2038
74ee0db180fa
6807801: CMS: could save/restore fewer header words during scavenge
ysr
parents:
2037
diff
changeset
|
4110 assert(evacuation_failed(), "Oversaving!"); |
|
74ee0db180fa
6807801: CMS: could save/restore fewer header words during scavenge
ysr
parents:
2037
diff
changeset
|
4111 // We want to call the "for_promotion_failure" version only in the |
|
74ee0db180fa
6807801: CMS: could save/restore fewer header words during scavenge
ysr
parents:
2037
diff
changeset
|
4112 // case of a promotion failure. |
|
74ee0db180fa
6807801: CMS: could save/restore fewer header words during scavenge
ysr
parents:
2037
diff
changeset
|
4113 if (m->must_be_preserved_for_promotion_failure(obj)) { |
| 342 | 4114 if (_objs_with_preserved_marks == NULL) { |
| 4115 assert(_preserved_marks_of_objs == NULL, "Both or none."); | |
| 4116 _objs_with_preserved_marks = | |
| 4117 new (ResourceObj::C_HEAP) GrowableArray<oop>(40, true); | |
| 4118 _preserved_marks_of_objs = | |
| 4119 new (ResourceObj::C_HEAP) GrowableArray<markOop>(40, true); | |
| 4120 } | |
| 4121 _objs_with_preserved_marks->push(obj); | |
| 4122 _preserved_marks_of_objs->push(m); | |
| 4123 } | |
| 4124 } | |
| 4125 | |
| 4126 HeapWord* G1CollectedHeap::par_allocate_during_gc(GCAllocPurpose purpose, | |
| 4127 size_t word_size) { | |
|
3830
f44782f04dd4
7039627: G1: avoid BOT updates for survivor allocations and dirty survivor regions incrementally
tonyp
parents:
3824
diff
changeset
|
4128 if (purpose == GCAllocForSurvived) { |
|
f44782f04dd4
7039627: G1: avoid BOT updates for survivor allocations and dirty survivor regions incrementally
tonyp
parents:
3824
diff
changeset
|
4129 HeapWord* result = survivor_attempt_allocation(word_size); |
|
f44782f04dd4
7039627: G1: avoid BOT updates for survivor allocations and dirty survivor regions incrementally
tonyp
parents:
3824
diff
changeset
|
4130 if (result != NULL) { |
|
f44782f04dd4
7039627: G1: avoid BOT updates for survivor allocations and dirty survivor regions incrementally
tonyp
parents:
3824
diff
changeset
|
4131 return result; |
| 342 | 4132 } else { |
|
3830
f44782f04dd4
7039627: G1: avoid BOT updates for survivor allocations and dirty survivor regions incrementally
tonyp
parents:
3824
diff
changeset
|
4133 // Let's try to allocate in the old gen in case we can fit the |
|
f44782f04dd4
7039627: G1: avoid BOT updates for survivor allocations and dirty survivor regions incrementally
tonyp
parents:
3824
diff
changeset
|
4134 // object there. |
|
f44782f04dd4
7039627: G1: avoid BOT updates for survivor allocations and dirty survivor regions incrementally
tonyp
parents:
3824
diff
changeset
|
4135 return old_attempt_allocation(word_size); |
| 342 | 4136 } |
|
3830
f44782f04dd4
7039627: G1: avoid BOT updates for survivor allocations and dirty survivor regions incrementally
tonyp
parents:
3824
diff
changeset
|
4137 } else { |
|
f44782f04dd4
7039627: G1: avoid BOT updates for survivor allocations and dirty survivor regions incrementally
tonyp
parents:
3824
diff
changeset
|
4138 assert(purpose == GCAllocForTenured, "sanity"); |
|
f44782f04dd4
7039627: G1: avoid BOT updates for survivor allocations and dirty survivor regions incrementally
tonyp
parents:
3824
diff
changeset
|
4139 HeapWord* result = old_attempt_allocation(word_size); |
|
f44782f04dd4
7039627: G1: avoid BOT updates for survivor allocations and dirty survivor regions incrementally
tonyp
parents:
3824
diff
changeset
|
4140 if (result != NULL) { |
|
f44782f04dd4
7039627: G1: avoid BOT updates for survivor allocations and dirty survivor regions incrementally
tonyp
parents:
3824
diff
changeset
|
4141 return result; |
| 342 | 4142 } else { |
|
3830
f44782f04dd4
7039627: G1: avoid BOT updates for survivor allocations and dirty survivor regions incrementally
tonyp
parents:
3824
diff
changeset
|
4143 // Let's try to allocate in the survivors in case we can fit the |
|
f44782f04dd4
7039627: G1: avoid BOT updates for survivor allocations and dirty survivor regions incrementally
tonyp
parents:
3824
diff
changeset
|
4144 // object there. |
|
f44782f04dd4
7039627: G1: avoid BOT updates for survivor allocations and dirty survivor regions incrementally
tonyp
parents:
3824
diff
changeset
|
4145 return survivor_attempt_allocation(word_size); |
| 342 | 4146 } |
|
3830
f44782f04dd4
7039627: G1: avoid BOT updates for survivor allocations and dirty survivor regions incrementally
tonyp
parents:
3824
diff
changeset
|
4147 } |
|
f44782f04dd4
7039627: G1: avoid BOT updates for survivor allocations and dirty survivor regions incrementally
tonyp
parents:
3824
diff
changeset
|
4148 |
|
f44782f04dd4
7039627: G1: avoid BOT updates for survivor allocations and dirty survivor regions incrementally
tonyp
parents:
3824
diff
changeset
|
4149 ShouldNotReachHere(); |
|
f44782f04dd4
7039627: G1: avoid BOT updates for survivor allocations and dirty survivor regions incrementally
tonyp
parents:
3824
diff
changeset
|
4150 // Trying to keep some compilers happy. |
|
f44782f04dd4
7039627: G1: avoid BOT updates for survivor allocations and dirty survivor regions incrementally
tonyp
parents:
3824
diff
changeset
|
4151 return NULL; |
| 342 | 4152 } |
| 4153 | |
|
3886
eeae91c9baba
7080389: G1: refactor marking code in evacuation pause copy closures
johnc
parents:
3869
diff
changeset
|
4154 G1ParGCAllocBuffer::G1ParGCAllocBuffer(size_t gclab_word_size) : |
|
4787
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
4785
diff
changeset
|
4155 ParGCAllocBuffer(gclab_word_size), _retired(false) { } |
|
3886
eeae91c9baba
7080389: G1: refactor marking code in evacuation pause copy closures
johnc
parents:
3869
diff
changeset
|
4156 |
|
845
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
ysr
parents:
838
diff
changeset
|
4157 G1ParScanThreadState::G1ParScanThreadState(G1CollectedHeap* g1h, int queue_num) |
|
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
ysr
parents:
838
diff
changeset
|
4158 : _g1h(g1h), |
|
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
ysr
parents:
838
diff
changeset
|
4159 _refs(g1h->task_queue(queue_num)), |
|
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
ysr
parents:
838
diff
changeset
|
4160 _dcq(&g1h->dirty_card_queue_set()), |
|
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
ysr
parents:
838
diff
changeset
|
4161 _ct_bs((CardTableModRefBS*)_g1h->barrier_set()), |
|
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
ysr
parents:
838
diff
changeset
|
4162 _g1_rem(g1h->g1_rem_set()), |
|
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
ysr
parents:
838
diff
changeset
|
4163 _hash_seed(17), _queue_num(queue_num), |
|
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
ysr
parents:
838
diff
changeset
|
4164 _term_attempts(0), |
|
1391
79e419e5ea3b
6942253: G1: replace G1ParallelGCAllocBufferSize with YoungPLABSize and OldPLABSize
apetrusenko
parents:
1390
diff
changeset
|
4165 _surviving_alloc_buffer(g1h->desired_plab_sz(GCAllocForSurvived)), |
|
79e419e5ea3b
6942253: G1: replace G1ParallelGCAllocBufferSize with YoungPLABSize and OldPLABSize
apetrusenko
parents:
1390
diff
changeset
|
4166 _tenured_alloc_buffer(g1h->desired_plab_sz(GCAllocForTenured)), |
|
845
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
ysr
parents:
838
diff
changeset
|
4167 _age_table(false), |
|
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
ysr
parents:
838
diff
changeset
|
4168 _strong_roots_time(0), _term_time(0), |
|
4787
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
4785
diff
changeset
|
4169 _alloc_buffer_waste(0), _undo_waste(0) { |
|
845
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
ysr
parents:
838
diff
changeset
|
4170 // we allocate G1YoungSurvRateNumRegions plus one entries, since |
|
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
ysr
parents:
838
diff
changeset
|
4171 // we "sacrifice" entry 0 to keep track of surviving bytes for |
|
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
ysr
parents:
838
diff
changeset
|
4172 // non-young regions (where the age is -1) |
|
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
ysr
parents:
838
diff
changeset
|
4173 // We also add a few elements at the beginning and at the end in |
|
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
ysr
parents:
838
diff
changeset
|
4174 // an attempt to eliminate cache contention |
|
4090
a88de71c4e3a
7097002: G1: remove a lot of unused / redundant code from the G1CollectorPolicy class
tonyp
parents:
4073
diff
changeset
|
4175 size_t real_length = 1 + _g1h->g1_policy()->young_cset_region_length(); |
|
845
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
ysr
parents:
838
diff
changeset
|
4176 size_t array_length = PADDING_ELEM_NUM + |
|
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
ysr
parents:
838
diff
changeset
|
4177 real_length + |
|
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
ysr
parents:
838
diff
changeset
|
4178 PADDING_ELEM_NUM; |
|
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
ysr
parents:
838
diff
changeset
|
4179 _surviving_young_words_base = NEW_C_HEAP_ARRAY(size_t, array_length); |
|
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
ysr
parents:
838
diff
changeset
|
4180 if (_surviving_young_words_base == NULL) |
|
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
ysr
parents:
838
diff
changeset
|
4181 vm_exit_out_of_memory(array_length * sizeof(size_t), |
|
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
ysr
parents:
838
diff
changeset
|
4182 "Not enough space for young surv histo."); |
|
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
ysr
parents:
838
diff
changeset
|
4183 _surviving_young_words = _surviving_young_words_base + PADDING_ELEM_NUM; |
|
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
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|
4184 memset(_surviving_young_words, 0, real_length * sizeof(size_t)); |
|
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
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diff
changeset
|
4185 |
|
1391
79e419e5ea3b
6942253: G1: replace G1ParallelGCAllocBufferSize with YoungPLABSize and OldPLABSize
apetrusenko
parents:
1390
diff
changeset
|
4186 _alloc_buffers[GCAllocForSurvived] = &_surviving_alloc_buffer; |
|
79e419e5ea3b
6942253: G1: replace G1ParallelGCAllocBufferSize with YoungPLABSize and OldPLABSize
apetrusenko
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diff
changeset
|
4187 _alloc_buffers[GCAllocForTenured] = &_tenured_alloc_buffer; |
|
79e419e5ea3b
6942253: G1: replace G1ParallelGCAllocBufferSize with YoungPLABSize and OldPLABSize
apetrusenko
parents:
1390
diff
changeset
|
4188 |
|
845
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
ysr
parents:
838
diff
changeset
|
4189 _start = os::elapsedTime(); |
|
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
ysr
parents:
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diff
changeset
|
4190 } |
| 342 | 4191 |
| 1709 | 4192 void |
| 4193 G1ParScanThreadState::print_termination_stats_hdr(outputStream* const st) | |
| 4194 { | |
| 4195 st->print_raw_cr("GC Termination Stats"); | |
| 4196 st->print_raw_cr(" elapsed --strong roots-- -------termination-------" | |
| 4197 " ------waste (KiB)------"); | |
| 4198 st->print_raw_cr("thr ms ms % ms % attempts" | |
| 4199 " total alloc undo"); | |
| 4200 st->print_raw_cr("--- --------- --------- ------ --------- ------ --------" | |
| 4201 " ------- ------- -------"); | |
| 4202 } | |
| 4203 | |
| 4204 void | |
| 4205 G1ParScanThreadState::print_termination_stats(int i, | |
| 4206 outputStream* const st) const | |
| 4207 { | |
| 4208 const double elapsed_ms = elapsed_time() * 1000.0; | |
| 4209 const double s_roots_ms = strong_roots_time() * 1000.0; | |
| 4210 const double term_ms = term_time() * 1000.0; | |
| 4211 st->print_cr("%3d %9.2f %9.2f %6.2f " | |
| 4212 "%9.2f %6.2f " SIZE_FORMAT_W(8) " " | |
| 4213 SIZE_FORMAT_W(7) " " SIZE_FORMAT_W(7) " " SIZE_FORMAT_W(7), | |
| 4214 i, elapsed_ms, s_roots_ms, s_roots_ms * 100 / elapsed_ms, | |
| 4215 term_ms, term_ms * 100 / elapsed_ms, term_attempts(), | |
| 4216 (alloc_buffer_waste() + undo_waste()) * HeapWordSize / K, | |
| 4217 alloc_buffer_waste() * HeapWordSize / K, | |
| 4218 undo_waste() * HeapWordSize / K); | |
| 4219 } | |
| 4220 | |
|
1862
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6989448: G1: refactor and simplify G1ParScanThreadState
jcoomes
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diff
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|
4221 #ifdef ASSERT |
|
b14ec34b1e07
6989448: G1: refactor and simplify G1ParScanThreadState
jcoomes
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1861
diff
changeset
|
4222 bool G1ParScanThreadState::verify_ref(narrowOop* ref) const { |
|
b14ec34b1e07
6989448: G1: refactor and simplify G1ParScanThreadState
jcoomes
parents:
1861
diff
changeset
|
4223 assert(ref != NULL, "invariant"); |
|
b14ec34b1e07
6989448: G1: refactor and simplify G1ParScanThreadState
jcoomes
parents:
1861
diff
changeset
|
4224 assert(UseCompressedOops, "sanity"); |
|
b14ec34b1e07
6989448: G1: refactor and simplify G1ParScanThreadState
jcoomes
parents:
1861
diff
changeset
|
4225 assert(!has_partial_array_mask(ref), err_msg("ref=" PTR_FORMAT, ref)); |
|
b14ec34b1e07
6989448: G1: refactor and simplify G1ParScanThreadState
jcoomes
parents:
1861
diff
changeset
|
4226 oop p = oopDesc::load_decode_heap_oop(ref); |
|
b14ec34b1e07
6989448: G1: refactor and simplify G1ParScanThreadState
jcoomes
parents:
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diff
changeset
|
4227 assert(_g1h->is_in_g1_reserved(p), |
|
b14ec34b1e07
6989448: G1: refactor and simplify G1ParScanThreadState
jcoomes
parents:
1861
diff
changeset
|
4228 err_msg("ref=" PTR_FORMAT " p=" PTR_FORMAT, ref, intptr_t(p))); |
|
b14ec34b1e07
6989448: G1: refactor and simplify G1ParScanThreadState
jcoomes
parents:
1861
diff
changeset
|
4229 return true; |
|
b14ec34b1e07
6989448: G1: refactor and simplify G1ParScanThreadState
jcoomes
parents:
1861
diff
changeset
|
4230 } |
|
b14ec34b1e07
6989448: G1: refactor and simplify G1ParScanThreadState
jcoomes
parents:
1861
diff
changeset
|
4231 |
|
b14ec34b1e07
6989448: G1: refactor and simplify G1ParScanThreadState
jcoomes
parents:
1861
diff
changeset
|
4232 bool G1ParScanThreadState::verify_ref(oop* ref) const { |
|
b14ec34b1e07
6989448: G1: refactor and simplify G1ParScanThreadState
jcoomes
parents:
1861
diff
changeset
|
4233 assert(ref != NULL, "invariant"); |
|
b14ec34b1e07
6989448: G1: refactor and simplify G1ParScanThreadState
jcoomes
parents:
1861
diff
changeset
|
4234 if (has_partial_array_mask(ref)) { |
|
b14ec34b1e07
6989448: G1: refactor and simplify G1ParScanThreadState
jcoomes
parents:
1861
diff
changeset
|
4235 // Must be in the collection set--it's already been copied. |
|
b14ec34b1e07
6989448: G1: refactor and simplify G1ParScanThreadState
jcoomes
parents:
1861
diff
changeset
|
4236 oop p = clear_partial_array_mask(ref); |
|
b14ec34b1e07
6989448: G1: refactor and simplify G1ParScanThreadState
jcoomes
parents:
1861
diff
changeset
|
4237 assert(_g1h->obj_in_cs(p), |
|
b14ec34b1e07
6989448: G1: refactor and simplify G1ParScanThreadState
jcoomes
parents:
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diff
changeset
|
4238 err_msg("ref=" PTR_FORMAT " p=" PTR_FORMAT, ref, intptr_t(p))); |
|
b14ec34b1e07
6989448: G1: refactor and simplify G1ParScanThreadState
jcoomes
parents:
1861
diff
changeset
|
4239 } else { |
|
b14ec34b1e07
6989448: G1: refactor and simplify G1ParScanThreadState
jcoomes
parents:
1861
diff
changeset
|
4240 oop p = oopDesc::load_decode_heap_oop(ref); |
|
b14ec34b1e07
6989448: G1: refactor and simplify G1ParScanThreadState
jcoomes
parents:
1861
diff
changeset
|
4241 assert(_g1h->is_in_g1_reserved(p), |
|
b14ec34b1e07
6989448: G1: refactor and simplify G1ParScanThreadState
jcoomes
parents:
1861
diff
changeset
|
4242 err_msg("ref=" PTR_FORMAT " p=" PTR_FORMAT, ref, intptr_t(p))); |
|
b14ec34b1e07
6989448: G1: refactor and simplify G1ParScanThreadState
jcoomes
parents:
1861
diff
changeset
|
4243 } |
|
b14ec34b1e07
6989448: G1: refactor and simplify G1ParScanThreadState
jcoomes
parents:
1861
diff
changeset
|
4244 return true; |
|
b14ec34b1e07
6989448: G1: refactor and simplify G1ParScanThreadState
jcoomes
parents:
1861
diff
changeset
|
4245 } |
|
b14ec34b1e07
6989448: G1: refactor and simplify G1ParScanThreadState
jcoomes
parents:
1861
diff
changeset
|
4246 |
|
b14ec34b1e07
6989448: G1: refactor and simplify G1ParScanThreadState
jcoomes
parents:
1861
diff
changeset
|
4247 bool G1ParScanThreadState::verify_task(StarTask ref) const { |
|
b14ec34b1e07
6989448: G1: refactor and simplify G1ParScanThreadState
jcoomes
parents:
1861
diff
changeset
|
4248 if (ref.is_narrow()) { |
|
b14ec34b1e07
6989448: G1: refactor and simplify G1ParScanThreadState
jcoomes
parents:
1861
diff
changeset
|
4249 return verify_ref((narrowOop*) ref); |
|
b14ec34b1e07
6989448: G1: refactor and simplify G1ParScanThreadState
jcoomes
parents:
1861
diff
changeset
|
4250 } else { |
|
b14ec34b1e07
6989448: G1: refactor and simplify G1ParScanThreadState
jcoomes
parents:
1861
diff
changeset
|
4251 return verify_ref((oop*) ref); |
|
b14ec34b1e07
6989448: G1: refactor and simplify G1ParScanThreadState
jcoomes
parents:
1861
diff
changeset
|
4252 } |
|
b14ec34b1e07
6989448: G1: refactor and simplify G1ParScanThreadState
jcoomes
parents:
1861
diff
changeset
|
4253 } |
|
b14ec34b1e07
6989448: G1: refactor and simplify G1ParScanThreadState
jcoomes
parents:
1861
diff
changeset
|
4254 #endif // ASSERT |
|
b14ec34b1e07
6989448: G1: refactor and simplify G1ParScanThreadState
jcoomes
parents:
1861
diff
changeset
|
4255 |
|
b14ec34b1e07
6989448: G1: refactor and simplify G1ParScanThreadState
jcoomes
parents:
1861
diff
changeset
|
4256 void G1ParScanThreadState::trim_queue() { |
|
3979
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
4257 assert(_evac_cl != NULL, "not set"); |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
4258 assert(_evac_failure_cl != NULL, "not set"); |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
4259 assert(_partial_scan_cl != NULL, "not set"); |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
4260 |
|
1862
b14ec34b1e07
6989448: G1: refactor and simplify G1ParScanThreadState
jcoomes
parents:
1861
diff
changeset
|
4261 StarTask ref; |
|
b14ec34b1e07
6989448: G1: refactor and simplify G1ParScanThreadState
jcoomes
parents:
1861
diff
changeset
|
4262 do { |
|
b14ec34b1e07
6989448: G1: refactor and simplify G1ParScanThreadState
jcoomes
parents:
1861
diff
changeset
|
4263 // Drain the overflow stack first, so other threads can steal. |
|
b14ec34b1e07
6989448: G1: refactor and simplify G1ParScanThreadState
jcoomes
parents:
1861
diff
changeset
|
4264 while (refs()->pop_overflow(ref)) { |
|
b14ec34b1e07
6989448: G1: refactor and simplify G1ParScanThreadState
jcoomes
parents:
1861
diff
changeset
|
4265 deal_with_reference(ref); |
|
b14ec34b1e07
6989448: G1: refactor and simplify G1ParScanThreadState
jcoomes
parents:
1861
diff
changeset
|
4266 } |
|
3979
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
4267 |
|
1862
b14ec34b1e07
6989448: G1: refactor and simplify G1ParScanThreadState
jcoomes
parents:
1861
diff
changeset
|
4268 while (refs()->pop_local(ref)) { |
|
b14ec34b1e07
6989448: G1: refactor and simplify G1ParScanThreadState
jcoomes
parents:
1861
diff
changeset
|
4269 deal_with_reference(ref); |
|
b14ec34b1e07
6989448: G1: refactor and simplify G1ParScanThreadState
jcoomes
parents:
1861
diff
changeset
|
4270 } |
|
b14ec34b1e07
6989448: G1: refactor and simplify G1ParScanThreadState
jcoomes
parents:
1861
diff
changeset
|
4271 } while (!refs()->is_empty()); |
|
b14ec34b1e07
6989448: G1: refactor and simplify G1ParScanThreadState
jcoomes
parents:
1861
diff
changeset
|
4272 } |
|
b14ec34b1e07
6989448: G1: refactor and simplify G1ParScanThreadState
jcoomes
parents:
1861
diff
changeset
|
4273 |
|
4787
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
4785
diff
changeset
|
4274 G1ParClosureSuper::G1ParClosureSuper(G1CollectedHeap* g1, |
|
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
4785
diff
changeset
|
4275 G1ParScanThreadState* par_scan_state) : |
| 342 | 4276 _g1(g1), _g1_rem(_g1->g1_rem_set()), _cm(_g1->concurrent_mark()), |
|
3886
eeae91c9baba
7080389: G1: refactor marking code in evacuation pause copy closures
johnc
parents:
3869
diff
changeset
|
4277 _par_scan_state(par_scan_state), |
|
eeae91c9baba
7080389: G1: refactor marking code in evacuation pause copy closures
johnc
parents:
3869
diff
changeset
|
4278 _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
|
4279 _mark_in_progress(_g1->mark_in_progress()) { } |
|
eeae91c9baba
7080389: G1: refactor marking code in evacuation pause copy closures
johnc
parents:
3869
diff
changeset
|
4280 |
|
4787
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
4785
diff
changeset
|
4281 void G1ParCopyHelper::mark_object(oop obj) { |
|
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
4785
diff
changeset
|
4282 #ifdef ASSERT |
|
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
4785
diff
changeset
|
4283 HeapRegion* hr = _g1->heap_region_containing(obj); |
|
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
4785
diff
changeset
|
4284 assert(hr != NULL, "sanity"); |
|
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
4785
diff
changeset
|
4285 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
|
4286 #endif // ASSERT |
|
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
4785
diff
changeset
|
4287 |
|
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
4785
diff
changeset
|
4288 // We know that the object is not moving so it's safe to read its size. |
|
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
4785
diff
changeset
|
4289 _cm->grayRoot(obj, (size_t) obj->size()); |
|
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
4785
diff
changeset
|
4290 } |
|
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
4785
diff
changeset
|
4291 |
|
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
4785
diff
changeset
|
4292 void G1ParCopyHelper::mark_forwarded_object(oop from_obj, oop to_obj) { |
|
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
4785
diff
changeset
|
4293 #ifdef ASSERT |
|
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
4785
diff
changeset
|
4294 assert(from_obj->is_forwarded(), "from obj should be forwarded"); |
|
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
4785
diff
changeset
|
4295 assert(from_obj->forwardee() == to_obj, "to obj should be the forwardee"); |
|
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
4785
diff
changeset
|
4296 assert(from_obj != to_obj, "should not be self-forwarded"); |
|
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
4785
diff
changeset
|
4297 |
|
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
4785
diff
changeset
|
4298 HeapRegion* from_hr = _g1->heap_region_containing(from_obj); |
|
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
4785
diff
changeset
|
4299 assert(from_hr != NULL, "sanity"); |
|
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
4785
diff
changeset
|
4300 assert(from_hr->in_collection_set(), "from obj should be in the CSet"); |
|
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
4785
diff
changeset
|
4301 |
|
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
4785
diff
changeset
|
4302 HeapRegion* to_hr = _g1->heap_region_containing(to_obj); |
|
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
4785
diff
changeset
|
4303 assert(to_hr != NULL, "sanity"); |
|
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
4785
diff
changeset
|
4304 assert(!to_hr->in_collection_set(), "should not mark objects in the CSet"); |
|
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
4785
diff
changeset
|
4305 #endif // ASSERT |
|
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
4785
diff
changeset
|
4306 |
|
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
4785
diff
changeset
|
4307 // The object might be in the process of being copied by another |
|
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
4785
diff
changeset
|
4308 // worker so we cannot trust that its to-space image is |
|
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
4785
diff
changeset
|
4309 // well-formed. So we have to read its size from its from-space |
|
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
4785
diff
changeset
|
4310 // image which we know should not be changing. |
|
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
4785
diff
changeset
|
4311 _cm->grayRoot(to_obj, (size_t) from_obj->size()); |
|
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
4785
diff
changeset
|
4312 } |
|
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
4785
diff
changeset
|
4313 |
|
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
4785
diff
changeset
|
4314 oop G1ParCopyHelper::copy_to_survivor_space(oop old) { |
| 342 | 4315 size_t word_sz = old->size(); |
| 4316 HeapRegion* from_region = _g1->heap_region_containing_raw(old); | |
| 4317 // +1 to make the -1 indexes valid... | |
| 4318 int young_index = from_region->young_index_in_cset()+1; | |
|
4787
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
4785
diff
changeset
|
4319 assert( (from_region->is_young() && young_index > 0) || |
|
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
4785
diff
changeset
|
4320 (!from_region->is_young() && young_index == 0), "invariant" ); |
| 342 | 4321 G1CollectorPolicy* g1p = _g1->g1_policy(); |
| 4322 markOop m = old->mark(); | |
| 545 | 4323 int age = m->has_displaced_mark_helper() ? m->displaced_mark_helper()->age() |
| 4324 : m->age(); | |
| 4325 GCAllocPurpose alloc_purpose = g1p->evacuation_destination(from_region, age, | |
| 342 | 4326 word_sz); |
| 4327 HeapWord* obj_ptr = _par_scan_state->allocate(alloc_purpose, word_sz); | |
| 4328 oop obj = oop(obj_ptr); | |
| 4329 | |
| 4330 if (obj_ptr == NULL) { | |
| 4331 // This will either forward-to-self, or detect that someone else has | |
| 4332 // installed a forwarding pointer. | |
| 4333 OopsInHeapRegionClosure* cl = _par_scan_state->evac_failure_closure(); | |
|
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|
4334 return _g1->handle_evacuation_failure_par(cl, old); |
| 342 | 4335 } |
| 4336 | |
| 526 | 4337 // We're going to allocate linearly, so might as well prefetch ahead. |
| 4338 Prefetch::write(obj_ptr, PrefetchCopyIntervalInBytes); | |
| 4339 | |
| 342 | 4340 oop forward_ptr = old->forward_to_atomic(obj); |
| 4341 if (forward_ptr == NULL) { | |
| 4342 Copy::aligned_disjoint_words((HeapWord*) old, obj_ptr, word_sz); | |
| 526 | 4343 if (g1p->track_object_age(alloc_purpose)) { |
| 4344 // We could simply do obj->incr_age(). However, this causes a | |
| 4345 // performance issue. obj->incr_age() will first check whether | |
| 4346 // the object has a displaced mark by checking its mark word; | |
| 4347 // getting the mark word from the new location of the object | |
| 4348 // stalls. So, given that we already have the mark word and we | |
| 4349 // are about to install it anyway, it's better to increase the | |
| 4350 // age on the mark word, when the object does not have a | |
| 4351 // displaced mark word. We're not expecting many objects to have | |
| 4352 // a displaced marked word, so that case is not optimized | |
| 4353 // further (it could be...) and we simply call obj->incr_age(). | |
| 4354 | |
| 4355 if (m->has_displaced_mark_helper()) { | |
| 4356 // in this case, we have to install the mark word first, | |
| 4357 // otherwise obj looks to be forwarded (the old mark word, | |
| 4358 // which contains the forward pointer, was copied) | |
| 4359 obj->set_mark(m); | |
| 4360 obj->incr_age(); | |
| 4361 } else { | |
| 4362 m = m->incr_age(); | |
| 545 | 4363 obj->set_mark(m); |
| 526 | 4364 } |
| 545 | 4365 _par_scan_state->age_table()->add(obj, word_sz); |
| 4366 } else { | |
| 4367 obj->set_mark(m); | |
| 526 | 4368 } |
| 4369 | |
| 342 | 4370 size_t* surv_young_words = _par_scan_state->surviving_young_words(); |
| 4371 surv_young_words[young_index] += word_sz; | |
| 4372 | |
| 4373 if (obj->is_objArray() && arrayOop(obj)->length() >= ParGCArrayScanChunk) { | |
|
4784
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|
4374 // We keep track of the next start index in the length field of |
|
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|
4375 // the to-space object. The actual length can be found in the |
|
02838862dec8
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|
4376 // length field of the from-space object. |
|
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|
4377 arrayOop(obj)->set_length(0); |
|
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|
4378 oop* old_p = set_partial_array_mask(old); |
|
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|
4379 _par_scan_state->push_on_queue(old_p); |
| 342 | 4380 } else { |
| 526 | 4381 // No point in using the slower heap_region_containing() method, |
| 4382 // given that we know obj is in the heap. | |
| 4383 _scanner->set_region(_g1->heap_region_containing_raw(obj)); | |
| 342 | 4384 obj->oop_iterate_backwards(_scanner); |
| 4385 } | |
| 4386 } else { | |
| 4387 _par_scan_state->undo_allocation(alloc_purpose, obj_ptr, word_sz); | |
| 4388 obj = forward_ptr; | |
| 4389 } | |
| 4390 return obj; | |
| 4391 } | |
| 4392 | |
|
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|
4393 template <bool do_gen_barrier, G1Barrier barrier, bool do_mark_object> |
|
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|
4394 template <class T> |
|
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|
4395 void G1ParCopyClosure<do_gen_barrier, barrier, do_mark_object> |
|
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4396 ::do_oop_work(T* p) { |
|
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4397 oop obj = oopDesc::load_decode_heap_oop(p); |
| 342 | 4398 assert(barrier != G1BarrierRS || obj != NULL, |
|
4787
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|
4399 "Precondition: G1BarrierRS implies obj is non-NULL"); |
|
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|
4400 |
| 526 | 4401 // here the null check is implicit in the cset_fast_test() test |
|
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|
4402 if (_g1->in_cset_fast_test(obj)) { |
|
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|
4403 oop forwardee; |
| 526 | 4404 if (obj->is_forwarded()) { |
|
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|
4405 forwardee = obj->forwardee(); |
| 526 | 4406 } else { |
|
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|
4407 forwardee = copy_to_survivor_space(obj); |
| 342 | 4408 } |
|
4787
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|
4409 assert(forwardee != NULL, "forwardee should not be NULL"); |
|
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|
4410 oopDesc::encode_store_heap_oop(p, forwardee); |
|
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|
4411 if (do_mark_object && forwardee != obj) { |
|
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|
4412 // If the object is self-forwarded we don't need to explicitly |
|
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|
4413 // mark it, the evacuation failure protocol will do so. |
|
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|
4414 mark_forwarded_object(obj, forwardee); |
|
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|
4415 } |
|
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|
4416 |
| 526 | 4417 // When scanning the RS, we only care about objs in CS. |
| 4418 if (barrier == G1BarrierRS) { | |
|
616
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|
4419 _par_scan_state->update_rs(_from, p, _par_scan_state->queue_num()); |
| 342 | 4420 } |
|
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|
4421 } else { |
|
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|
4422 // The object is not in collection set. If we're a root scanning |
|
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|
4423 // closure during an initial mark pause (i.e. do_mark_object will |
|
eeae91c9baba
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|
4424 // be true) then attempt to mark the object. |
|
4787
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|
4425 if (do_mark_object && _g1->is_in_g1_reserved(obj)) { |
|
2ace1c4ee8da
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|
4426 mark_object(obj); |
|
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|
4427 } |
| 526 | 4428 } |
| 4429 | |
| 4430 if (barrier == G1BarrierEvac && obj != NULL) { | |
|
616
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|
4431 _par_scan_state->update_rs(_from, p, _par_scan_state->queue_num()); |
| 526 | 4432 } |
| 4433 | |
| 4434 if (do_gen_barrier && obj != NULL) { | |
| 4435 par_do_barrier(p); | |
| 4436 } | |
| 4437 } | |
| 4438 | |
|
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|
4439 template void G1ParCopyClosure<false, G1BarrierEvac, false>::do_oop_work(oop* p); |
|
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|
4440 template void G1ParCopyClosure<false, G1BarrierEvac, false>::do_oop_work(narrowOop* p); |
|
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|
4441 |
|
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|
4442 template <class T> void G1ParScanPartialArrayClosure::do_oop_nv(T* p) { |
| 526 | 4443 assert(has_partial_array_mask(p), "invariant"); |
|
4784
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|
4444 oop from_obj = clear_partial_array_mask(p); |
|
02838862dec8
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|
4445 |
|
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changeset
|
4446 assert(Universe::heap()->is_in_reserved(from_obj), "must be in heap."); |
|
02838862dec8
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|
4447 assert(from_obj->is_objArray(), "must be obj array"); |
|
02838862dec8
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|
4448 objArrayOop from_obj_array = objArrayOop(from_obj); |
|
02838862dec8
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|
4449 // The from-space object contains the real length. |
|
02838862dec8
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|
4450 int length = from_obj_array->length(); |
|
02838862dec8
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|
4451 |
|
02838862dec8
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changeset
|
4452 assert(from_obj->is_forwarded(), "must be forwarded"); |
|
02838862dec8
7121623: G1: always be able to reliably calculate the length of a forwarded chunked array
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|
4453 oop to_obj = from_obj->forwardee(); |
|
02838862dec8
7121623: G1: always be able to reliably calculate the length of a forwarded chunked array
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changeset
|
4454 assert(from_obj != to_obj, "should not be chunking self-forwarded objects"); |
|
02838862dec8
7121623: G1: always be able to reliably calculate the length of a forwarded chunked array
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|
4455 objArrayOop to_obj_array = objArrayOop(to_obj); |
|
02838862dec8
7121623: G1: always be able to reliably calculate the length of a forwarded chunked array
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changeset
|
4456 // We keep track of the next start index in the length field of the |
|
02838862dec8
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|
4457 // to-space object. |
|
02838862dec8
7121623: G1: always be able to reliably calculate the length of a forwarded chunked array
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changeset
|
4458 int next_index = to_obj_array->length(); |
|
02838862dec8
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changeset
|
4459 assert(0 <= next_index && next_index < length, |
|
02838862dec8
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changeset
|
4460 err_msg("invariant, next index: %d, length: %d", next_index, length)); |
|
02838862dec8
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|
4461 |
|
02838862dec8
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|
4462 int start = next_index; |
|
02838862dec8
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|
4463 int end = length; |
|
02838862dec8
7121623: G1: always be able to reliably calculate the length of a forwarded chunked array
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|
4464 int remainder = end - start; |
|
02838862dec8
7121623: G1: always be able to reliably calculate the length of a forwarded chunked array
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changeset
|
4465 // We'll try not to push a range that's smaller than ParGCArrayScanChunk. |
| 342 | 4466 if (remainder > 2 * ParGCArrayScanChunk) { |
| 4467 end = start + ParGCArrayScanChunk; | |
|
4784
02838862dec8
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|
4468 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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|
4469 // Push the remainder before we process the range in case another |
|
02838862dec8
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|
4470 // worker has run out of things to do and can steal it. |
|
02838862dec8
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|
4471 oop* from_obj_p = set_partial_array_mask(from_obj); |
|
02838862dec8
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|
4472 _par_scan_state->push_on_queue(from_obj_p); |
| 342 | 4473 } else { |
|
4784
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changeset
|
4474 assert(length == end, "sanity"); |
|
02838862dec8
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changeset
|
4475 // 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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|
4476 // 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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changeset
|
4477 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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|
4478 } |
|
02838862dec8
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changeset
|
4479 _scanner.set_region(_g1->heap_region_containing_raw(to_obj)); |
|
02838862dec8
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|
4480 // Process indexes [start,end). It will also process the header |
|
02838862dec8
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|
4481 // along with the first chunk (i.e., the chunk with start == 0). |
|
02838862dec8
7121623: G1: always be able to reliably calculate the length of a forwarded chunked array
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changeset
|
4482 // Note that at this point the length field of to_obj_array is not |
|
02838862dec8
7121623: G1: always be able to reliably calculate the length of a forwarded chunked array
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changeset
|
4483 // correct given that we are using it to keep track of the next |
|
02838862dec8
7121623: G1: always be able to reliably calculate the length of a forwarded chunked array
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changeset
|
4484 // start index. oop_iterate_range() (thankfully!) ignores the length |
|
02838862dec8
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changeset
|
4485 // field and only relies on the start / end parameters. It does |
|
02838862dec8
7121623: G1: always be able to reliably calculate the length of a forwarded chunked array
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changeset
|
4486 // however return the size of the object which will be incorrect. So |
|
02838862dec8
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changeset
|
4487 // we have to ignore it even if we wanted to use it. |
|
02838862dec8
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changeset
|
4488 to_obj_array->oop_iterate_range(&_scanner, start, end); |
| 342 | 4489 } |
| 4490 | |
| 4491 class G1ParEvacuateFollowersClosure : public VoidClosure { | |
| 4492 protected: | |
| 4493 G1CollectedHeap* _g1h; | |
| 4494 G1ParScanThreadState* _par_scan_state; | |
| 4495 RefToScanQueueSet* _queues; | |
| 4496 ParallelTaskTerminator* _terminator; | |
| 4497 | |
| 4498 G1ParScanThreadState* par_scan_state() { return _par_scan_state; } | |
| 4499 RefToScanQueueSet* queues() { return _queues; } | |
| 4500 ParallelTaskTerminator* terminator() { return _terminator; } | |
| 4501 | |
| 4502 public: | |
| 4503 G1ParEvacuateFollowersClosure(G1CollectedHeap* g1h, | |
| 4504 G1ParScanThreadState* par_scan_state, | |
| 4505 RefToScanQueueSet* queues, | |
| 4506 ParallelTaskTerminator* terminator) | |
| 4507 : _g1h(g1h), _par_scan_state(par_scan_state), | |
| 4508 _queues(queues), _terminator(terminator) {} | |
| 4509 | |
|
1862
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diff
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|
4510 void do_void(); |
|
b14ec34b1e07
6989448: G1: refactor and simplify G1ParScanThreadState
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changeset
|
4511 |
|
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changeset
|
4512 private: |
|
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diff
changeset
|
4513 inline bool offer_termination(); |
|
b14ec34b1e07
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jcoomes
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diff
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|
4514 }; |
|
b14ec34b1e07
6989448: G1: refactor and simplify G1ParScanThreadState
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diff
changeset
|
4515 |
|
b14ec34b1e07
6989448: G1: refactor and simplify G1ParScanThreadState
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diff
changeset
|
4516 bool G1ParEvacuateFollowersClosure::offer_termination() { |
|
b14ec34b1e07
6989448: G1: refactor and simplify G1ParScanThreadState
jcoomes
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1861
diff
changeset
|
4517 G1ParScanThreadState* const pss = par_scan_state(); |
|
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|
4518 pss->start_term_time(); |
|
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|
4519 const bool res = terminator()->offer_termination(); |
|
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4520 pss->end_term_time(); |
|
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|
4521 return res; |
|
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|
4522 } |
|
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|
4523 |
|
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|
4524 void G1ParEvacuateFollowersClosure::do_void() { |
|
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|
4525 StarTask stolen_task; |
|
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|
4526 G1ParScanThreadState* const pss = par_scan_state(); |
|
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4527 pss->trim_queue(); |
|
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|
4528 |
|
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|
4529 do { |
|
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|
4530 while (queues()->steal(pss->queue_num(), pss->hash_seed(), stolen_task)) { |
|
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|
4531 assert(pss->verify_task(stolen_task), "sanity"); |
|
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|
4532 if (stolen_task.is_narrow()) { |
|
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|
4533 pss->deal_with_reference((narrowOop*) stolen_task); |
|
1862
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|
4534 } else { |
|
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|
4535 pss->deal_with_reference((oop*) stolen_task); |
|
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|
4536 } |
|
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|
4537 |
|
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|
4538 // We've just processed a reference and we might have made |
|
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|
4539 // available new entries on the queues. So we have to make sure |
|
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|
4540 // we drain the queues as necessary. |
| 342 | 4541 pss->trim_queue(); |
| 4542 } | |
|
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|
4543 } while (!offer_termination()); |
|
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|
4544 |
|
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|
4545 pss->retire_alloc_buffers(); |
|
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|
4546 } |
| 342 | 4547 |
| 4548 class G1ParTask : public AbstractGangTask { | |
| 4549 protected: | |
| 4550 G1CollectedHeap* _g1h; | |
| 4551 RefToScanQueueSet *_queues; | |
| 4552 ParallelTaskTerminator _terminator; | |
|
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|
4553 uint _n_workers; |
| 342 | 4554 |
| 4555 Mutex _stats_lock; | |
| 4556 Mutex* stats_lock() { return &_stats_lock; } | |
| 4557 | |
| 4558 size_t getNCards() { | |
| 4559 return (_g1h->capacity() + G1BlockOffsetSharedArray::N_bytes - 1) | |
| 4560 / G1BlockOffsetSharedArray::N_bytes; | |
| 4561 } | |
| 4562 | |
| 4563 public: | |
|
4095
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|
4564 G1ParTask(G1CollectedHeap* g1h, |
|
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|
4565 RefToScanQueueSet *task_queues) |
| 342 | 4566 : AbstractGangTask("G1 collection"), |
| 4567 _g1h(g1h), | |
| 4568 _queues(task_queues), | |
|
4095
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|
4569 _terminator(0, _queues), |
|
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|
4570 _stats_lock(Mutex::leaf, "parallel G1 stats lock", true) |
| 342 | 4571 {} |
| 4572 | |
| 4573 RefToScanQueueSet* queues() { return _queues; } | |
| 4574 | |
| 4575 RefToScanQueue *work_queue(int i) { | |
| 4576 return queues()->queue(i); | |
| 4577 } | |
| 4578 | |
|
4095
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|
4579 ParallelTaskTerminator* terminator() { return &_terminator; } |
|
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|
4580 |
|
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|
4581 virtual void set_for_termination(int active_workers) { |
|
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|
4582 // This task calls set_n_termination() in par_non_clean_card_iterate_work() |
|
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|
4583 // in the young space (_par_seq_tasks) in the G1 heap |
|
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|
4584 // for SequentialSubTasksDone. |
|
bca17e38de00
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|
4585 // This task also uses SubTasksDone in SharedHeap and G1CollectedHeap |
|
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|
4586 // both of which need setting by set_n_termination(). |
|
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|
4587 _g1h->SharedHeap::set_n_termination(active_workers); |
|
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|
4588 _g1h->set_n_termination(active_workers); |
|
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|
4589 terminator()->reset_for_reuse(active_workers); |
|
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|
4590 _n_workers = active_workers; |
|
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|
4591 } |
|
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|
4592 |
|
4728
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|
4593 void work(uint worker_id) { |
|
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|
4594 if (worker_id >= _n_workers) return; // no work needed this round |
| 1611 | 4595 |
| 4596 double start_time_ms = os::elapsedTime() * 1000.0; | |
|
4728
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|
4597 _g1h->g1_policy()->record_gc_worker_start_time(worker_id, start_time_ms); |
| 1611 | 4598 |
| 342 | 4599 ResourceMark rm; |
| 4600 HandleMark hm; | |
| 4601 | |
|
3979
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|
4602 ReferenceProcessor* rp = _g1h->ref_processor_stw(); |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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|
4603 |
|
4728
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|
4604 G1ParScanThreadState pss(_g1h, worker_id); |
|
3979
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6484982: G1: process references during evacuation pauses
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|
4605 G1ParScanHeapEvacClosure scan_evac_cl(_g1h, &pss, rp); |
|
4dfb2df418f2
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|
4606 G1ParScanHeapEvacFailureClosure evac_failure_cl(_g1h, &pss, rp); |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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|
4607 G1ParScanPartialArrayClosure partial_scan_cl(_g1h, &pss, rp); |
| 342 | 4608 |
| 4609 pss.set_evac_closure(&scan_evac_cl); | |
| 4610 pss.set_evac_failure_closure(&evac_failure_cl); | |
| 4611 pss.set_partial_scan_closure(&partial_scan_cl); | |
| 4612 | |
|
3979
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|
4613 G1ParScanExtRootClosure only_scan_root_cl(_g1h, &pss, rp); |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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|
4614 G1ParScanPermClosure only_scan_perm_cl(_g1h, &pss, rp); |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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|
4615 |
|
4dfb2df418f2
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|
4616 G1ParScanAndMarkExtRootClosure scan_mark_root_cl(_g1h, &pss, rp); |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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|
4617 G1ParScanAndMarkPermClosure scan_mark_perm_cl(_g1h, &pss, rp); |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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|
4618 |
|
4dfb2df418f2
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changeset
|
4619 OopClosure* scan_root_cl = &only_scan_root_cl; |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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3973
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|
4620 OopsInHeapRegionClosure* scan_perm_cl = &only_scan_perm_cl; |
| 342 | 4621 |
|
1359
23b1b27ac76c
6909756: G1: guarantee(G1CollectedHeap::heap()->mark_in_progress(),"Precondition.")
tonyp
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1313
diff
changeset
|
4622 if (_g1h->g1_policy()->during_initial_mark_pause()) { |
|
3979
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6484982: G1: process references during evacuation pauses
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changeset
|
4623 // We also need to mark copied objects. |
| 342 | 4624 scan_root_cl = &scan_mark_root_cl; |
| 4625 scan_perm_cl = &scan_mark_perm_cl; | |
| 4626 } | |
| 4627 | |
|
3983
811ec3d0833b
7097053: G1: assert(da ? referent->is_oop() : referent->is_oop_or_null()) failed: referenceProcessor.cpp:1054
johnc
parents:
3982
diff
changeset
|
4628 G1ParPushHeapRSClosure push_heap_rs_cl(_g1h, &pss); |
|
3979
4dfb2df418f2
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|
4629 |
| 342 | 4630 pss.start_strong_roots(); |
| 4631 _g1h->g1_process_strong_roots(/* not collecting perm */ false, | |
| 4632 SharedHeap::SO_AllClasses, | |
| 4633 scan_root_cl, | |
|
1261
0414c1049f15
6923991: G1: improve scalability of RSet scanning
iveresov
parents:
1245
diff
changeset
|
4634 &push_heap_rs_cl, |
| 342 | 4635 scan_perm_cl, |
|
4728
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jmasa
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|
4636 worker_id); |
| 342 | 4637 pss.end_strong_roots(); |
|
3823
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|
4638 |
| 342 | 4639 { |
| 4640 double start = os::elapsedTime(); | |
| 4641 G1ParEvacuateFollowersClosure evac(_g1h, &pss, _queues, &_terminator); | |
| 4642 evac.do_void(); | |
| 4643 double elapsed_ms = (os::elapsedTime()-start)*1000.0; | |
| 4644 double term_ms = pss.term_time()*1000.0; | |
|
4728
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|
4645 _g1h->g1_policy()->record_obj_copy_time(worker_id, elapsed_ms-term_ms); |
|
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|
4646 _g1h->g1_policy()->record_termination(worker_id, term_ms, pss.term_attempts()); |
| 342 | 4647 } |
| 1282 | 4648 _g1h->g1_policy()->record_thread_age_table(pss.age_table()); |
| 342 | 4649 _g1h->update_surviving_young_words(pss.surviving_young_words()+1); |
| 4650 | |
| 4651 // Clean up any par-expanded rem sets. | |
| 4652 HeapRegionRemSet::par_cleanup(); | |
| 4653 | |
| 4654 if (ParallelGCVerbose) { | |
| 1709 | 4655 MutexLocker x(stats_lock()); |
|
4728
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|
4656 pss.print_termination_stats(worker_id); |
| 342 | 4657 } |
| 4658 | |
|
1862
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|
4659 assert(pss.refs()->is_empty(), "should be empty"); |
| 1611 | 4660 double end_time_ms = os::elapsedTime() * 1000.0; |
|
4728
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|
4661 _g1h->g1_policy()->record_gc_worker_end_time(worker_id, end_time_ms); |
| 342 | 4662 } |
| 4663 }; | |
| 4664 | |
| 4665 // *** Common G1 Evacuation Stuff | |
| 4666 | |
|
1833
8b10f48633dc
6984287: Regularize how GC parallel workers are specified.
jmasa
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1755
diff
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|
4667 // This method is run in a GC worker. |
|
8b10f48633dc
6984287: Regularize how GC parallel workers are specified.
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diff
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|
4668 |
| 342 | 4669 void |
| 4670 G1CollectedHeap:: | |
| 4671 g1_process_strong_roots(bool collecting_perm_gen, | |
| 4672 SharedHeap::ScanningOption so, | |
| 4673 OopClosure* scan_non_heap_roots, | |
| 4674 OopsInHeapRegionClosure* scan_rs, | |
| 4675 OopsInGenClosure* scan_perm, | |
| 4676 int worker_i) { | |
|
3979
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|
4677 |
| 342 | 4678 // First scan the strong roots, including the perm gen. |
| 4679 double ext_roots_start = os::elapsedTime(); | |
| 4680 double closure_app_time_sec = 0.0; | |
| 4681 | |
| 4682 BufferingOopClosure buf_scan_non_heap_roots(scan_non_heap_roots); | |
| 4683 BufferingOopsInGenClosure buf_scan_perm(scan_perm); | |
| 4684 buf_scan_perm.set_generation(perm_gen()); | |
| 4685 | |
|
989
148e5441d916
6863023: need non-perm oops in code cache for JSR 292
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|
4686 // Walk the code cache w/o buffering, because StarTask cannot handle |
|
148e5441d916
6863023: need non-perm oops in code cache for JSR 292
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diff
changeset
|
4687 // unaligned oop locations. |
|
148e5441d916
6863023: need non-perm oops in code cache for JSR 292
jrose
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890
diff
changeset
|
4688 CodeBlobToOopClosure eager_scan_code_roots(scan_non_heap_roots, /*do_marking=*/ true); |
|
148e5441d916
6863023: need non-perm oops in code cache for JSR 292
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890
diff
changeset
|
4689 |
|
148e5441d916
6863023: need non-perm oops in code cache for JSR 292
jrose
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890
diff
changeset
|
4690 process_strong_roots(false, // no scoping; this is parallel code |
|
148e5441d916
6863023: need non-perm oops in code cache for JSR 292
jrose
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890
diff
changeset
|
4691 collecting_perm_gen, so, |
| 342 | 4692 &buf_scan_non_heap_roots, |
|
989
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890
diff
changeset
|
4693 &eager_scan_code_roots, |
| 342 | 4694 &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
|
4695 |
|
3979
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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|
4696 // Now the CM ref_processor roots. |
|
3823
14a2fd14c0db
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3778
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|
4697 if (!_process_strong_tasks->is_task_claimed(G1H_PS_refProcessor_oops_do)) { |
|
3979
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|
4698 // We need to treat the discovered reference lists of the |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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|
4699 // concurrent mark ref processor as roots and keep entries |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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changeset
|
4700 // (which are added by the marking threads) on them live |
|
4dfb2df418f2
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|
4701 // until they can be processed at the end of marking. |
|
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|
4702 ref_processor_cm()->weak_oops_do(&buf_scan_non_heap_roots); |
|
3823
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|
4703 } |
|
14a2fd14c0db
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|
4704 |
|
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|
4705 // Finish up any enqueued closure apps (attributed as object copy time). |
| 342 | 4706 buf_scan_non_heap_roots.done(); |
| 4707 buf_scan_perm.done(); | |
|
3823
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|
4708 |
| 342 | 4709 double ext_roots_end = os::elapsedTime(); |
|
3823
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|
4710 |
| 342 | 4711 g1_policy()->reset_obj_copy_time(worker_i); |
|
3823
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|
4712 double obj_copy_time_sec = buf_scan_perm.closure_app_seconds() + |
|
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|
4713 buf_scan_non_heap_roots.closure_app_seconds(); |
| 342 | 4714 g1_policy()->record_obj_copy_time(worker_i, obj_copy_time_sec * 1000.0); |
|
3823
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|
4715 |
| 342 | 4716 double ext_root_time_ms = |
| 4717 ((ext_roots_end - ext_roots_start) - obj_copy_time_sec) * 1000.0; | |
|
3823
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|
4718 |
| 342 | 4719 g1_policy()->record_ext_root_scan_time(worker_i, ext_root_time_ms); |
| 4720 | |
|
4787
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
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4785
diff
changeset
|
4721 // 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
|
4722 // to make sure we remove any oops into the CSet (which will show up |
|
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
4785
diff
changeset
|
4723 // as implicitly live). |
|
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
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4785
diff
changeset
|
4724 if (!_process_strong_tasks->is_task_claimed(G1H_PS_filter_satb_buffers)) { |
|
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
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parents:
4785
diff
changeset
|
4725 if (mark_in_progress()) { |
|
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
4785
diff
changeset
|
4726 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
|
4727 } |
|
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
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parents:
4785
diff
changeset
|
4728 } |
|
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
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parents:
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diff
changeset
|
4729 double satb_filtering_ms = (os::elapsedTime() - ext_roots_end) * 1000.0; |
|
2ace1c4ee8da
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tonyp
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diff
changeset
|
4730 g1_policy()->record_satb_filtering_time(worker_i, satb_filtering_ms); |
| 342 | 4731 |
| 4732 // Now scan the complement of the collection set. | |
| 4733 if (scan_rs != NULL) { | |
| 4734 g1_rem_set()->oops_into_collection_set_do(scan_rs, worker_i); | |
| 4735 } | |
|
3823
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|
4736 |
| 342 | 4737 _process_strong_tasks->all_tasks_completed(); |
| 4738 } | |
| 4739 | |
| 4740 void | |
| 4741 G1CollectedHeap::g1_process_weak_roots(OopClosure* root_closure, | |
| 4742 OopClosure* non_root_closure) { | |
|
989
148e5441d916
6863023: need non-perm oops in code cache for JSR 292
jrose
parents:
890
diff
changeset
|
4743 CodeBlobToOopClosure roots_in_blobs(root_closure, /*do_marking=*/ false); |
|
148e5441d916
6863023: need non-perm oops in code cache for JSR 292
jrose
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changeset
|
4744 SharedHeap::process_weak_roots(root_closure, &roots_in_blobs, non_root_closure); |
| 342 | 4745 } |
| 4746 | |
|
3979
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|
4747 // Weak Reference Processing support |
|
4dfb2df418f2
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changeset
|
4748 |
|
4dfb2df418f2
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changeset
|
4749 // An always "is_alive" closure that is used to preserve referents. |
|
4dfb2df418f2
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|
4750 // If the object is non-null then it's alive. Used in the preservation |
|
4dfb2df418f2
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|
4751 // of referent objects that are pointed to by reference objects |
|
4dfb2df418f2
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|
4752 // discovered by the CM ref processor. |
|
4dfb2df418f2
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changeset
|
4753 class G1AlwaysAliveClosure: public BoolObjectClosure { |
|
4dfb2df418f2
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|
4754 G1CollectedHeap* _g1; |
|
4dfb2df418f2
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|
4755 public: |
|
4dfb2df418f2
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parents:
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changeset
|
4756 G1AlwaysAliveClosure(G1CollectedHeap* g1) : _g1(g1) {} |
|
4dfb2df418f2
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changeset
|
4757 void do_object(oop p) { assert(false, "Do not call."); } |
|
4dfb2df418f2
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parents:
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changeset
|
4758 bool do_object_b(oop p) { |
|
4dfb2df418f2
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parents:
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diff
changeset
|
4759 if (p != NULL) { |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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parents:
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diff
changeset
|
4760 return true; |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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parents:
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diff
changeset
|
4761 } |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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parents:
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diff
changeset
|
4762 return false; |
|
4dfb2df418f2
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parents:
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diff
changeset
|
4763 } |
|
4dfb2df418f2
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parents:
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diff
changeset
|
4764 }; |
|
4dfb2df418f2
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changeset
|
4765 |
|
4dfb2df418f2
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parents:
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diff
changeset
|
4766 bool G1STWIsAliveClosure::do_object_b(oop p) { |
|
4dfb2df418f2
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parents:
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diff
changeset
|
4767 // An object is reachable if it is outside the collection set, |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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parents:
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diff
changeset
|
4768 // or is inside and copied. |
|
4dfb2df418f2
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parents:
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diff
changeset
|
4769 return !_g1->obj_in_cs(p) || p->is_forwarded(); |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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parents:
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diff
changeset
|
4770 } |
|
4dfb2df418f2
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parents:
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diff
changeset
|
4771 |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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parents:
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diff
changeset
|
4772 // Non Copying Keep Alive closure |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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parents:
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diff
changeset
|
4773 class G1KeepAliveClosure: public OopClosure { |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
4774 G1CollectedHeap* _g1; |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
4775 public: |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
4776 G1KeepAliveClosure(G1CollectedHeap* g1) : _g1(g1) {} |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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parents:
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diff
changeset
|
4777 void do_oop(narrowOop* p) { guarantee(false, "Not needed"); } |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
4778 void do_oop( oop* p) { |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
4779 oop obj = *p; |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
4780 |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
4781 if (_g1->obj_in_cs(obj)) { |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
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diff
changeset
|
4782 assert( obj->is_forwarded(), "invariant" ); |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
4783 *p = obj->forwardee(); |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
4784 } |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
4785 } |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
4786 }; |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
4787 |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
4788 // Copying Keep Alive closure - can be called from both |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
4789 // serial and parallel code as long as different worker |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
4790 // threads utilize different G1ParScanThreadState instances |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
4791 // and different queues. |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
4792 |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
4793 class G1CopyingKeepAliveClosure: public OopClosure { |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
4794 G1CollectedHeap* _g1h; |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
4795 OopClosure* _copy_non_heap_obj_cl; |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
4796 OopsInHeapRegionClosure* _copy_perm_obj_cl; |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
4797 G1ParScanThreadState* _par_scan_state; |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
4798 |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
4799 public: |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
4800 G1CopyingKeepAliveClosure(G1CollectedHeap* g1h, |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
4801 OopClosure* non_heap_obj_cl, |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
4802 OopsInHeapRegionClosure* perm_obj_cl, |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
4803 G1ParScanThreadState* pss): |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
4804 _g1h(g1h), |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
4805 _copy_non_heap_obj_cl(non_heap_obj_cl), |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
4806 _copy_perm_obj_cl(perm_obj_cl), |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
4807 _par_scan_state(pss) |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
4808 {} |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
4809 |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
4810 virtual void do_oop(narrowOop* p) { do_oop_work(p); } |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
4811 virtual void do_oop( oop* p) { do_oop_work(p); } |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
4812 |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
4813 template <class T> void do_oop_work(T* p) { |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
4814 oop obj = oopDesc::load_decode_heap_oop(p); |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
4815 |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
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diff
changeset
|
4816 if (_g1h->obj_in_cs(obj)) { |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
4817 // If the referent object has been forwarded (either copied |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
4818 // to a new location or to itself in the event of an |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
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diff
changeset
|
4819 // evacuation failure) then we need to update the reference |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
4820 // field and, if both reference and referent are in the G1 |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
4821 // heap, update the RSet for the referent. |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
4822 // |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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parents:
3973
diff
changeset
|
4823 // 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
|
4824 // it alive by policy. Therefore we have copy the referent. |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
4825 // |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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parents:
3973
diff
changeset
|
4826 // 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
|
4827 // on the PSS queue. When the queue is drained (after each |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
4828 // phase of reference processing) the object and it's followers |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
4829 // will be copied, the reference field set to point to the |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
4830 // new location, and the RSet updated. Otherwise we need to |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
4831 // use the the non-heap or perm closures directly to copy |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
4832 // the refernt object and update the pointer, while avoiding |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
4833 // updating the RSet. |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
4834 |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
4835 if (_g1h->is_in_g1_reserved(p)) { |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
4836 _par_scan_state->push_on_queue(p); |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
4837 } else { |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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parents:
3973
diff
changeset
|
4838 // The reference field is not in the G1 heap. |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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diff
changeset
|
4839 if (_g1h->perm_gen()->is_in(p)) { |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
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diff
changeset
|
4840 _copy_perm_obj_cl->do_oop(p); |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
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diff
changeset
|
4841 } else { |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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parents:
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diff
changeset
|
4842 _copy_non_heap_obj_cl->do_oop(p); |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
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diff
changeset
|
4843 } |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
4844 } |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
4845 } |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
4846 } |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
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diff
changeset
|
4847 }; |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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parents:
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diff
changeset
|
4848 |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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parents:
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diff
changeset
|
4849 // Serial drain queue closure. Called as the 'complete_gc' |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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parents:
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diff
changeset
|
4850 // closure for each discovered list in some of the |
|
4dfb2df418f2
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parents:
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diff
changeset
|
4851 // reference processing phases. |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
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diff
changeset
|
4852 |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
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diff
changeset
|
4853 class G1STWDrainQueueClosure: public VoidClosure { |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
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diff
changeset
|
4854 protected: |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
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diff
changeset
|
4855 G1CollectedHeap* _g1h; |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
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diff
changeset
|
4856 G1ParScanThreadState* _par_scan_state; |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
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diff
changeset
|
4857 |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
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diff
changeset
|
4858 G1ParScanThreadState* par_scan_state() { return _par_scan_state; } |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
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diff
changeset
|
4859 |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
4860 public: |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
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diff
changeset
|
4861 G1STWDrainQueueClosure(G1CollectedHeap* g1h, G1ParScanThreadState* pss) : |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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parents:
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diff
changeset
|
4862 _g1h(g1h), |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
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diff
changeset
|
4863 _par_scan_state(pss) |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
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diff
changeset
|
4864 { } |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
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diff
changeset
|
4865 |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
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diff
changeset
|
4866 void do_void() { |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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parents:
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diff
changeset
|
4867 G1ParScanThreadState* const pss = par_scan_state(); |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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parents:
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diff
changeset
|
4868 pss->trim_queue(); |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
4869 } |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
4870 }; |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
4871 |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
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diff
changeset
|
4872 // Parallel Reference Processing closures |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
4873 |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
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diff
changeset
|
4874 // Implementation of AbstractRefProcTaskExecutor for parallel reference |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
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diff
changeset
|
4875 // processing during G1 evacuation pauses. |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
4876 |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
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diff
changeset
|
4877 class G1STWRefProcTaskExecutor: public AbstractRefProcTaskExecutor { |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
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diff
changeset
|
4878 private: |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
4879 G1CollectedHeap* _g1h; |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
4880 RefToScanQueueSet* _queues; |
|
4095
bca17e38de00
6593758: RFE: Enhance GC ergonomics to dynamically choose ParallelGCThreads
jmasa
parents:
4090
diff
changeset
|
4881 FlexibleWorkGang* _workers; |
|
3979
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
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diff
changeset
|
4882 int _active_workers; |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
4883 |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
4884 public: |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
4885 G1STWRefProcTaskExecutor(G1CollectedHeap* g1h, |
|
4095
bca17e38de00
6593758: RFE: Enhance GC ergonomics to dynamically choose ParallelGCThreads
jmasa
parents:
4090
diff
changeset
|
4886 FlexibleWorkGang* workers, |
|
3979
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
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diff
changeset
|
4887 RefToScanQueueSet *task_queues, |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
4888 int n_workers) : |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
4889 _g1h(g1h), |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
4890 _queues(task_queues), |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
4891 _workers(workers), |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
4892 _active_workers(n_workers) |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
4893 { |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
4894 assert(n_workers > 0, "shouldn't call this otherwise"); |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
4895 } |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
4896 |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
4897 // Executes the given task using concurrent marking worker threads. |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
4898 virtual void execute(ProcessTask& task); |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
4899 virtual void execute(EnqueueTask& task); |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
4900 }; |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
4901 |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
4902 // Gang task for possibly parallel reference processing |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
4903 |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
4904 class G1STWRefProcTaskProxy: public AbstractGangTask { |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
4905 typedef AbstractRefProcTaskExecutor::ProcessTask ProcessTask; |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
4906 ProcessTask& _proc_task; |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
4907 G1CollectedHeap* _g1h; |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
4908 RefToScanQueueSet *_task_queues; |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
4909 ParallelTaskTerminator* _terminator; |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
4910 |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
4911 public: |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
4912 G1STWRefProcTaskProxy(ProcessTask& proc_task, |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
4913 G1CollectedHeap* g1h, |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
4914 RefToScanQueueSet *task_queues, |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
4915 ParallelTaskTerminator* terminator) : |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
4916 AbstractGangTask("Process reference objects in parallel"), |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
4917 _proc_task(proc_task), |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
4918 _g1h(g1h), |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
4919 _task_queues(task_queues), |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
4920 _terminator(terminator) |
|
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 |
|
4728
441e946dc1af
7121618: Change type of number of GC workers to unsigned int.
jmasa
parents:
4711
diff
changeset
|
4923 virtual void work(uint worker_id) { |
|
3979
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
4924 // The reference processing task executed by a single worker. |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
4925 ResourceMark rm; |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
4926 HandleMark hm; |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
4927 |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
4928 G1STWIsAliveClosure is_alive(_g1h); |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
4929 |
|
4728
441e946dc1af
7121618: Change type of number of GC workers to unsigned int.
jmasa
parents:
4711
diff
changeset
|
4930 G1ParScanThreadState pss(_g1h, worker_id); |
|
3979
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
4931 |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
4932 G1ParScanHeapEvacClosure scan_evac_cl(_g1h, &pss, NULL); |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
4933 G1ParScanHeapEvacFailureClosure evac_failure_cl(_g1h, &pss, NULL); |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
4934 G1ParScanPartialArrayClosure partial_scan_cl(_g1h, &pss, NULL); |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
4935 |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
4936 pss.set_evac_closure(&scan_evac_cl); |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
4937 pss.set_evac_failure_closure(&evac_failure_cl); |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
4938 pss.set_partial_scan_closure(&partial_scan_cl); |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
4939 |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
4940 G1ParScanExtRootClosure only_copy_non_heap_cl(_g1h, &pss, NULL); |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
4941 G1ParScanPermClosure only_copy_perm_cl(_g1h, &pss, NULL); |
|
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 G1ParScanAndMarkExtRootClosure copy_mark_non_heap_cl(_g1h, &pss, NULL); |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
4944 G1ParScanAndMarkPermClosure copy_mark_perm_cl(_g1h, &pss, NULL); |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
4945 |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
4946 OopClosure* copy_non_heap_cl = &only_copy_non_heap_cl; |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
4947 OopsInHeapRegionClosure* copy_perm_cl = &only_copy_perm_cl; |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
4948 |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
4949 if (_g1h->g1_policy()->during_initial_mark_pause()) { |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
4950 // We also need to mark copied objects. |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
4951 copy_non_heap_cl = ©_mark_non_heap_cl; |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
4952 copy_perm_cl = ©_mark_perm_cl; |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
4953 } |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
4954 |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
4955 // Keep alive closure. |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
4956 G1CopyingKeepAliveClosure keep_alive(_g1h, copy_non_heap_cl, copy_perm_cl, &pss); |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
4957 |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
4958 // Complete GC closure |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
4959 G1ParEvacuateFollowersClosure drain_queue(_g1h, &pss, _task_queues, _terminator); |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
4960 |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
4961 // Call the reference processing task's work routine. |
|
4728
441e946dc1af
7121618: Change type of number of GC workers to unsigned int.
jmasa
parents:
4711
diff
changeset
|
4962 _proc_task.work(worker_id, is_alive, keep_alive, drain_queue); |
|
3979
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
4963 |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
4964 // Note we cannot assert that the refs array is empty here as not all |
|
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|
4965 // of the processing tasks (specifically phase2 - pp2_work) execute |
|
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|
4966 // the complete_gc closure (which ordinarily would drain the queue) so |
|
4dfb2df418f2
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|
4967 // the queue may not be empty. |
|
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diff
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|
4968 } |
|
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|
4969 }; |
|
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|
4970 |
|
4dfb2df418f2
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|
4971 // Driver routine for parallel reference processing. |
|
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|
4972 // Creates an instance of the ref processing gang |
|
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|
4973 // task and has the worker threads execute it. |
|
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|
4974 void G1STWRefProcTaskExecutor::execute(ProcessTask& proc_task) { |
|
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|
4975 assert(_workers != NULL, "Need parallel worker threads."); |
|
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|
4976 |
|
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|
4977 ParallelTaskTerminator terminator(_active_workers, _queues); |
|
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|
4978 G1STWRefProcTaskProxy proc_task_proxy(proc_task, _g1h, _queues, &terminator); |
|
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|
4979 |
|
4dfb2df418f2
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changeset
|
4980 _g1h->set_par_threads(_active_workers); |
|
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|
4981 _workers->run_task(&proc_task_proxy); |
|
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|
4982 _g1h->set_par_threads(0); |
|
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|
4983 } |
|
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changeset
|
4984 |
|
4dfb2df418f2
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|
4985 // Gang task for parallel reference enqueueing. |
|
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changeset
|
4986 |
|
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|
4987 class G1STWRefEnqueueTaskProxy: public AbstractGangTask { |
|
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|
4988 typedef AbstractRefProcTaskExecutor::EnqueueTask EnqueueTask; |
|
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|
4989 EnqueueTask& _enq_task; |
|
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|
4990 |
|
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|
4991 public: |
|
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|
4992 G1STWRefEnqueueTaskProxy(EnqueueTask& enq_task) : |
|
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|
4993 AbstractGangTask("Enqueue reference objects in parallel"), |
|
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|
4994 _enq_task(enq_task) |
|
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|
4995 { } |
|
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|
4996 |
|
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|
4997 virtual void work(uint worker_id) { |
|
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|
4998 _enq_task.work(worker_id); |
|
3979
4dfb2df418f2
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|
4999 } |
|
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|
5000 }; |
|
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|
5001 |
|
4dfb2df418f2
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|
5002 // Driver routine for parallel reference enqueing. |
|
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|
5003 // Creates an instance of the ref enqueueing gang |
|
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|
5004 // task and has the worker threads execute it. |
|
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changeset
|
5005 |
|
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|
5006 void G1STWRefProcTaskExecutor::execute(EnqueueTask& enq_task) { |
|
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|
5007 assert(_workers != NULL, "Need parallel worker threads."); |
|
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|
5008 |
|
4dfb2df418f2
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|
5009 G1STWRefEnqueueTaskProxy enq_task_proxy(enq_task); |
|
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changeset
|
5010 |
|
4dfb2df418f2
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changeset
|
5011 _g1h->set_par_threads(_active_workers); |
|
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|
5012 _workers->run_task(&enq_task_proxy); |
|
4dfb2df418f2
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|
5013 _g1h->set_par_threads(0); |
|
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parents:
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|
5014 } |
|
4dfb2df418f2
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parents:
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diff
changeset
|
5015 |
|
4dfb2df418f2
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parents:
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diff
changeset
|
5016 // End of weak reference support closures |
|
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parents:
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diff
changeset
|
5017 |
|
4dfb2df418f2
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|
5018 // Abstract task used to preserve (i.e. copy) any referent objects |
|
4dfb2df418f2
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|
5019 // that are in the collection set and are pointed to by reference |
|
4dfb2df418f2
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parents:
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diff
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|
5020 // objects discovered by the CM ref processor. |
|
4dfb2df418f2
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parents:
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diff
changeset
|
5021 |
|
4dfb2df418f2
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parents:
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changeset
|
5022 class G1ParPreserveCMReferentsTask: public AbstractGangTask { |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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parents:
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diff
changeset
|
5023 protected: |
|
4dfb2df418f2
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parents:
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diff
changeset
|
5024 G1CollectedHeap* _g1h; |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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parents:
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diff
changeset
|
5025 RefToScanQueueSet *_queues; |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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diff
changeset
|
5026 ParallelTaskTerminator _terminator; |
|
4728
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7121618: Change type of number of GC workers to unsigned int.
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|
5027 uint _n_workers; |
|
3979
4dfb2df418f2
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parents:
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changeset
|
5028 |
|
4dfb2df418f2
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parents:
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diff
changeset
|
5029 public: |
|
4dfb2df418f2
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parents:
3973
diff
changeset
|
5030 G1ParPreserveCMReferentsTask(G1CollectedHeap* g1h,int workers, RefToScanQueueSet *task_queues) : |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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parents:
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diff
changeset
|
5031 AbstractGangTask("ParPreserveCMReferents"), |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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parents:
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diff
changeset
|
5032 _g1h(g1h), |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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parents:
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diff
changeset
|
5033 _queues(task_queues), |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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parents:
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diff
changeset
|
5034 _terminator(workers, _queues), |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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parents:
3973
diff
changeset
|
5035 _n_workers(workers) |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5036 { } |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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parents:
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diff
changeset
|
5037 |
|
4728
441e946dc1af
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jmasa
parents:
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diff
changeset
|
5038 void work(uint worker_id) { |
|
3979
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5039 ResourceMark rm; |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5040 HandleMark hm; |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5041 |
|
4728
441e946dc1af
7121618: Change type of number of GC workers to unsigned int.
jmasa
parents:
4711
diff
changeset
|
5042 G1ParScanThreadState pss(_g1h, worker_id); |
|
3979
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5043 G1ParScanHeapEvacClosure scan_evac_cl(_g1h, &pss, NULL); |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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parents:
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diff
changeset
|
5044 G1ParScanHeapEvacFailureClosure evac_failure_cl(_g1h, &pss, NULL); |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
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diff
changeset
|
5045 G1ParScanPartialArrayClosure partial_scan_cl(_g1h, &pss, NULL); |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
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diff
changeset
|
5046 |
|
4dfb2df418f2
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johnc
parents:
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diff
changeset
|
5047 pss.set_evac_closure(&scan_evac_cl); |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
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diff
changeset
|
5048 pss.set_evac_failure_closure(&evac_failure_cl); |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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parents:
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diff
changeset
|
5049 pss.set_partial_scan_closure(&partial_scan_cl); |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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parents:
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diff
changeset
|
5050 |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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parents:
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diff
changeset
|
5051 assert(pss.refs()->is_empty(), "both queue and overflow should be empty"); |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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parents:
3973
diff
changeset
|
5052 |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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parents:
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diff
changeset
|
5053 |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
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diff
changeset
|
5054 G1ParScanExtRootClosure only_copy_non_heap_cl(_g1h, &pss, NULL); |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
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diff
changeset
|
5055 G1ParScanPermClosure only_copy_perm_cl(_g1h, &pss, NULL); |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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parents:
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diff
changeset
|
5056 |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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parents:
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diff
changeset
|
5057 G1ParScanAndMarkExtRootClosure copy_mark_non_heap_cl(_g1h, &pss, NULL); |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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parents:
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diff
changeset
|
5058 G1ParScanAndMarkPermClosure copy_mark_perm_cl(_g1h, &pss, NULL); |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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parents:
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diff
changeset
|
5059 |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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parents:
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diff
changeset
|
5060 OopClosure* copy_non_heap_cl = &only_copy_non_heap_cl; |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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parents:
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diff
changeset
|
5061 OopsInHeapRegionClosure* copy_perm_cl = &only_copy_perm_cl; |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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diff
changeset
|
5062 |
|
4dfb2df418f2
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parents:
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diff
changeset
|
5063 if (_g1h->g1_policy()->during_initial_mark_pause()) { |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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parents:
3973
diff
changeset
|
5064 // We also need to mark copied objects. |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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diff
changeset
|
5065 copy_non_heap_cl = ©_mark_non_heap_cl; |
|
4dfb2df418f2
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diff
changeset
|
5066 copy_perm_cl = ©_mark_perm_cl; |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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parents:
3973
diff
changeset
|
5067 } |
|
4dfb2df418f2
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3973
diff
changeset
|
5068 |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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diff
changeset
|
5069 // Is alive closure |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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parents:
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diff
changeset
|
5070 G1AlwaysAliveClosure always_alive(_g1h); |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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parents:
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diff
changeset
|
5071 |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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diff
changeset
|
5072 // Copying keep alive closure. Applied to referent objects that need |
|
4dfb2df418f2
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parents:
3973
diff
changeset
|
5073 // to be copied. |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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parents:
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diff
changeset
|
5074 G1CopyingKeepAliveClosure keep_alive(_g1h, copy_non_heap_cl, copy_perm_cl, &pss); |
|
4dfb2df418f2
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diff
changeset
|
5075 |
|
4dfb2df418f2
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diff
changeset
|
5076 ReferenceProcessor* rp = _g1h->ref_processor_cm(); |
|
4dfb2df418f2
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parents:
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diff
changeset
|
5077 |
|
4728
441e946dc1af
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jmasa
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4711
diff
changeset
|
5078 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
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diff
changeset
|
5079 uint stride = MIN2(MAX2(_n_workers, 1U), limit); |
|
3979
4dfb2df418f2
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parents:
3973
diff
changeset
|
5080 |
|
4dfb2df418f2
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diff
changeset
|
5081 // limit is set using max_num_q() - which was set using ParallelGCThreads. |
|
4dfb2df418f2
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parents:
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diff
changeset
|
5082 // So this must be true - but assert just in case someone decides to |
|
4dfb2df418f2
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diff
changeset
|
5083 // change the worker ids. |
|
4728
441e946dc1af
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jmasa
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4711
diff
changeset
|
5084 assert(0 <= worker_id && worker_id < limit, "sanity"); |
|
3979
4dfb2df418f2
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parents:
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diff
changeset
|
5085 assert(!rp->discovery_is_atomic(), "check this code"); |
|
4dfb2df418f2
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parents:
3973
diff
changeset
|
5086 |
|
4dfb2df418f2
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parents:
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diff
changeset
|
5087 // Select discovered lists [i, i+stride, i+2*stride,...,limit) |
|
4728
441e946dc1af
7121618: Change type of number of GC workers to unsigned int.
jmasa
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4711
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changeset
|
5088 for (uint idx = worker_id; idx < limit; idx += stride) { |
|
4014
bf2d2b8b1726
7095243: Disambiguate ReferenceProcessor::_discoveredSoftRefs
johnc
parents:
4013
diff
changeset
|
5089 DiscoveredList& ref_list = rp->discovered_refs()[idx]; |
|
3979
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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3973
diff
changeset
|
5090 |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5091 DiscoveredListIterator iter(ref_list, &keep_alive, &always_alive); |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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parents:
3973
diff
changeset
|
5092 while (iter.has_next()) { |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5093 // Since discovery is not atomic for the CM ref processor, we |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5094 // can see some null referent objects. |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5095 iter.load_ptrs(DEBUG_ONLY(true)); |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5096 oop ref = iter.obj(); |
|
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 // This will filter nulls. |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5099 if (iter.is_referent_alive()) { |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5100 iter.make_referent_alive(); |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5101 } |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5102 iter.move_to_next(); |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5103 } |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5104 } |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5105 |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5106 // Drain the queue - which may cause stealing |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5107 G1ParEvacuateFollowersClosure drain_queue(_g1h, &pss, _queues, &_terminator); |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5108 drain_queue.do_void(); |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5109 // Allocation buffers were retired at the end of G1ParEvacuateFollowersClosure |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5110 assert(pss.refs()->is_empty(), "should be"); |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5111 } |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5112 }; |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5113 |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5114 // Weak Reference processing during an evacuation pause (part 1). |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5115 void G1CollectedHeap::process_discovered_references() { |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5116 double ref_proc_start = os::elapsedTime(); |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5117 |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5118 ReferenceProcessor* rp = _ref_processor_stw; |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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parents:
3973
diff
changeset
|
5119 assert(rp->discovery_enabled(), "should have been enabled"); |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5120 |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5121 // Any reference objects, in the collection set, that were 'discovered' |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5122 // 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
|
5123 // applying the external root copy closure to the discovered lists, or |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5124 // by following an RSet entry). |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5125 // |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5126 // 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
|
5127 // 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
|
5128 // processor would have seen that the reference object had already |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5129 // been 'discovered' and would have skipped discovering the reference, |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5130 // 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
|
5131 // 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
|
5132 // referent object. |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5133 // |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5134 // We need to explicitly copy these referent objects - the references |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5135 // will be processed at the end of remarking. |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5136 // |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5137 // 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
|
5138 // 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
|
5139 // referents points to another object which is also referenced by an |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5140 // object discovered by the STW ref processor. |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5141 |
|
4728
441e946dc1af
7121618: Change type of number of GC workers to unsigned int.
jmasa
parents:
4711
diff
changeset
|
5142 uint active_workers = (G1CollectedHeap::use_parallel_gc_threads() ? |
|
4095
bca17e38de00
6593758: RFE: Enhance GC ergonomics to dynamically choose ParallelGCThreads
jmasa
parents:
4090
diff
changeset
|
5143 workers()->active_workers() : 1); |
|
bca17e38de00
6593758: RFE: Enhance GC ergonomics to dynamically choose ParallelGCThreads
jmasa
parents:
4090
diff
changeset
|
5144 |
| 4711 | 5145 assert(!G1CollectedHeap::use_parallel_gc_threads() || |
| 5146 active_workers == workers()->active_workers(), | |
| 5147 "Need to reset active_workers"); | |
| 5148 | |
|
4095
bca17e38de00
6593758: RFE: Enhance GC ergonomics to dynamically choose ParallelGCThreads
jmasa
parents:
4090
diff
changeset
|
5149 set_par_threads(active_workers); |
|
bca17e38de00
6593758: RFE: Enhance GC ergonomics to dynamically choose ParallelGCThreads
jmasa
parents:
4090
diff
changeset
|
5150 G1ParPreserveCMReferentsTask keep_cm_referents(this, active_workers, _task_queues); |
|
3979
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5151 |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5152 if (G1CollectedHeap::use_parallel_gc_threads()) { |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5153 workers()->run_task(&keep_cm_referents); |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5154 } else { |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5155 keep_cm_referents.work(0); |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5156 } |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5157 |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5158 set_par_threads(0); |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5159 |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5160 // Closure to test whether a referent is alive. |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5161 G1STWIsAliveClosure is_alive(this); |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5162 |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5163 // Even when parallel reference processing is enabled, the processing |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5164 // 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
|
5165 // 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
|
5166 // JNI refs. |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5167 |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5168 // Use only a single queue for this PSS. |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5169 G1ParScanThreadState pss(this, 0); |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5170 |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5171 // We do not embed a reference processor in the copying/scanning |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5172 // closures while we're actually processing the discovered |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5173 // reference objects. |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5174 G1ParScanHeapEvacClosure scan_evac_cl(this, &pss, NULL); |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5175 G1ParScanHeapEvacFailureClosure evac_failure_cl(this, &pss, NULL); |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5176 G1ParScanPartialArrayClosure partial_scan_cl(this, &pss, NULL); |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5177 |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5178 pss.set_evac_closure(&scan_evac_cl); |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5179 pss.set_evac_failure_closure(&evac_failure_cl); |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5180 pss.set_partial_scan_closure(&partial_scan_cl); |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5181 |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5182 assert(pss.refs()->is_empty(), "pre-condition"); |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5183 |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5184 G1ParScanExtRootClosure only_copy_non_heap_cl(this, &pss, NULL); |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5185 G1ParScanPermClosure only_copy_perm_cl(this, &pss, NULL); |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5186 |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5187 G1ParScanAndMarkExtRootClosure copy_mark_non_heap_cl(this, &pss, NULL); |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5188 G1ParScanAndMarkPermClosure copy_mark_perm_cl(this, &pss, NULL); |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5189 |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5190 OopClosure* copy_non_heap_cl = &only_copy_non_heap_cl; |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5191 OopsInHeapRegionClosure* copy_perm_cl = &only_copy_perm_cl; |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5192 |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5193 if (_g1h->g1_policy()->during_initial_mark_pause()) { |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5194 // We also need to mark copied objects. |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5195 copy_non_heap_cl = ©_mark_non_heap_cl; |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5196 copy_perm_cl = ©_mark_perm_cl; |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5197 } |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5198 |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5199 // Keep alive closure. |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5200 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
|
5201 |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5202 // Serial Complete GC closure |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5203 G1STWDrainQueueClosure drain_queue(this, &pss); |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5204 |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5205 // Setup the soft refs policy... |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5206 rp->setup_policy(false); |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5207 |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5208 if (!rp->processing_is_mt()) { |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5209 // Serial reference processing... |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5210 rp->process_discovered_references(&is_alive, |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5211 &keep_alive, |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5212 &drain_queue, |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5213 NULL); |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5214 } else { |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5215 // Parallel reference processing |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5216 assert(rp->num_q() == active_workers, "sanity"); |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5217 assert(active_workers <= rp->max_num_q(), "sanity"); |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5218 |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5219 G1STWRefProcTaskExecutor par_task_executor(this, workers(), _task_queues, active_workers); |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5220 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
|
5221 } |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5222 |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5223 // We have completed copying any necessary live referent objects |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5224 // (that were not copied during the actual pause) so we can |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5225 // retire any active alloc buffers |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5226 pss.retire_alloc_buffers(); |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5227 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
|
5228 |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5229 double ref_proc_time = os::elapsedTime() - ref_proc_start; |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5230 g1_policy()->record_ref_proc_time(ref_proc_time * 1000.0); |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5231 } |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5232 |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5233 // Weak Reference processing during an evacuation pause (part 2). |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5234 void G1CollectedHeap::enqueue_discovered_references() { |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5235 double ref_enq_start = os::elapsedTime(); |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5236 |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5237 ReferenceProcessor* rp = _ref_processor_stw; |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5238 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
|
5239 |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5240 // Now enqueue any remaining on the discovered lists on to |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5241 // the pending list. |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5242 if (!rp->processing_is_mt()) { |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5243 // Serial reference processing... |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5244 rp->enqueue_discovered_references(); |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5245 } else { |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5246 // Parallel reference enqueuing |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5247 |
|
4728
441e946dc1af
7121618: Change type of number of GC workers to unsigned int.
jmasa
parents:
4711
diff
changeset
|
5248 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
|
5249 assert(active_workers == workers()->active_workers(), |
|
bca17e38de00
6593758: RFE: Enhance GC ergonomics to dynamically choose ParallelGCThreads
jmasa
parents:
4090
diff
changeset
|
5250 "Need to reset active_workers"); |
|
3979
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5251 assert(rp->num_q() == active_workers, "sanity"); |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5252 assert(active_workers <= rp->max_num_q(), "sanity"); |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5253 |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5254 G1STWRefProcTaskExecutor par_task_executor(this, workers(), _task_queues, active_workers); |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5255 rp->enqueue_discovered_references(&par_task_executor); |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5256 } |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5257 |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5258 rp->verify_no_references_recorded(); |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5259 assert(!rp->discovery_enabled(), "should have been disabled"); |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5260 |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5261 // FIXME |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5262 // 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
|
5263 // 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
|
5264 // and could signicantly increase the pause time. |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5265 |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5266 double ref_enq_time = os::elapsedTime() - ref_enq_start; |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5267 g1_policy()->record_ref_enq_time(ref_enq_time * 1000.0); |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5268 } |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5269 |
| 342 | 5270 void G1CollectedHeap::evacuate_collection_set() { |
|
4781
bacb651cf5bf
7113006: G1: excessive ergo output when an evac failure happens
tonyp
parents:
4728
diff
changeset
|
5271 _expand_heap_after_alloc_failure = true; |
| 342 | 5272 set_evacuation_failed(false); |
| 5273 | |
| 5274 g1_rem_set()->prepare_for_oops_into_collection_set_do(); | |
| 5275 concurrent_g1_refine()->set_use_cache(false); | |
| 889 | 5276 concurrent_g1_refine()->clear_hot_cache_claimed_index(); |
| 5277 | |
|
4728
441e946dc1af
7121618: Change type of number of GC workers to unsigned int.
jmasa
parents:
4711
diff
changeset
|
5278 uint n_workers; |
|
4095
bca17e38de00
6593758: RFE: Enhance GC ergonomics to dynamically choose ParallelGCThreads
jmasa
parents:
4090
diff
changeset
|
5279 if (G1CollectedHeap::use_parallel_gc_threads()) { |
|
bca17e38de00
6593758: RFE: Enhance GC ergonomics to dynamically choose ParallelGCThreads
jmasa
parents:
4090
diff
changeset
|
5280 n_workers = |
|
bca17e38de00
6593758: RFE: Enhance GC ergonomics to dynamically choose ParallelGCThreads
jmasa
parents:
4090
diff
changeset
|
5281 AdaptiveSizePolicy::calc_active_workers(workers()->total_workers(), |
|
bca17e38de00
6593758: RFE: Enhance GC ergonomics to dynamically choose ParallelGCThreads
jmasa
parents:
4090
diff
changeset
|
5282 workers()->active_workers(), |
|
bca17e38de00
6593758: RFE: Enhance GC ergonomics to dynamically choose ParallelGCThreads
jmasa
parents:
4090
diff
changeset
|
5283 Threads::number_of_non_daemon_threads()); |
|
bca17e38de00
6593758: RFE: Enhance GC ergonomics to dynamically choose ParallelGCThreads
jmasa
parents:
4090
diff
changeset
|
5284 assert(UseDynamicNumberOfGCThreads || |
|
bca17e38de00
6593758: RFE: Enhance GC ergonomics to dynamically choose ParallelGCThreads
jmasa
parents:
4090
diff
changeset
|
5285 n_workers == workers()->total_workers(), |
|
bca17e38de00
6593758: RFE: Enhance GC ergonomics to dynamically choose ParallelGCThreads
jmasa
parents:
4090
diff
changeset
|
5286 "If not dynamic should be using all the workers"); |
| 4711 | 5287 workers()->set_active_workers(n_workers); |
|
4095
bca17e38de00
6593758: RFE: Enhance GC ergonomics to dynamically choose ParallelGCThreads
jmasa
parents:
4090
diff
changeset
|
5288 set_par_threads(n_workers); |
|
bca17e38de00
6593758: RFE: Enhance GC ergonomics to dynamically choose ParallelGCThreads
jmasa
parents:
4090
diff
changeset
|
5289 } else { |
|
bca17e38de00
6593758: RFE: Enhance GC ergonomics to dynamically choose ParallelGCThreads
jmasa
parents:
4090
diff
changeset
|
5290 assert(n_par_threads() == 0, |
|
bca17e38de00
6593758: RFE: Enhance GC ergonomics to dynamically choose ParallelGCThreads
jmasa
parents:
4090
diff
changeset
|
5291 "Should be the original non-parallel value"); |
|
bca17e38de00
6593758: RFE: Enhance GC ergonomics to dynamically choose ParallelGCThreads
jmasa
parents:
4090
diff
changeset
|
5292 n_workers = 1; |
|
bca17e38de00
6593758: RFE: Enhance GC ergonomics to dynamically choose ParallelGCThreads
jmasa
parents:
4090
diff
changeset
|
5293 } |
|
bca17e38de00
6593758: RFE: Enhance GC ergonomics to dynamically choose ParallelGCThreads
jmasa
parents:
4090
diff
changeset
|
5294 |
|
bca17e38de00
6593758: RFE: Enhance GC ergonomics to dynamically choose ParallelGCThreads
jmasa
parents:
4090
diff
changeset
|
5295 G1ParTask g1_par_task(this, _task_queues); |
| 342 | 5296 |
| 5297 init_for_evac_failure(NULL); | |
| 5298 | |
| 5299 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
|
5300 |
|
4f360ec815ba
6720309: G1: don't synchronously update RSet during evacuation pauses
iveresov
parents:
595
diff
changeset
|
5301 assert(dirty_card_queue_set().completed_buffers_num() == 0, "Should be empty"); |
| 342 | 5302 double start_par = os::elapsedTime(); |
|
3979
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5303 |
|
1833
8b10f48633dc
6984287: Regularize how GC parallel workers are specified.
jmasa
parents:
1755
diff
changeset
|
5304 if (G1CollectedHeap::use_parallel_gc_threads()) { |
| 342 | 5305 // The individual threads will set their evac-failure closures. |
|
989
148e5441d916
6863023: need non-perm oops in code cache for JSR 292
jrose
parents:
890
diff
changeset
|
5306 StrongRootsScope srs(this); |
| 1709 | 5307 if (ParallelGCVerbose) G1ParScanThreadState::print_termination_stats_hdr(); |
|
4095
bca17e38de00
6593758: RFE: Enhance GC ergonomics to dynamically choose ParallelGCThreads
jmasa
parents:
4090
diff
changeset
|
5308 // These tasks use ShareHeap::_process_strong_tasks |
|
bca17e38de00
6593758: RFE: Enhance GC ergonomics to dynamically choose ParallelGCThreads
jmasa
parents:
4090
diff
changeset
|
5309 assert(UseDynamicNumberOfGCThreads || |
|
bca17e38de00
6593758: RFE: Enhance GC ergonomics to dynamically choose ParallelGCThreads
jmasa
parents:
4090
diff
changeset
|
5310 workers()->active_workers() == workers()->total_workers(), |
|
bca17e38de00
6593758: RFE: Enhance GC ergonomics to dynamically choose ParallelGCThreads
jmasa
parents:
4090
diff
changeset
|
5311 "If not dynamic should be using all the workers"); |
| 342 | 5312 workers()->run_task(&g1_par_task); |
| 5313 } else { | |
|
989
148e5441d916
6863023: need non-perm oops in code cache for JSR 292
jrose
parents:
890
diff
changeset
|
5314 StrongRootsScope srs(this); |
| 4711 | 5315 g1_par_task.set_for_termination(n_workers); |
| 342 | 5316 g1_par_task.work(0); |
| 5317 } | |
| 5318 | |
| 5319 double par_time = (os::elapsedTime() - start_par) * 1000.0; | |
| 5320 g1_policy()->record_par_time(par_time); | |
|
4095
bca17e38de00
6593758: RFE: Enhance GC ergonomics to dynamically choose ParallelGCThreads
jmasa
parents:
4090
diff
changeset
|
5321 |
| 342 | 5322 set_par_threads(0); |
|
1974
fd1d227ef1b9
6983204: G1: Nightly test nsk/regression/b4958615 failing with +ExplicitGCInvokesConcurrent
johnc
parents:
1973
diff
changeset
|
5323 |
|
3979
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5324 // Process any discovered reference objects - we have |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5325 // to do this _before_ we retire the GC alloc regions |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5326 // as we may have to copy some 'reachable' referent |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5327 // objects (and their reachable sub-graphs) that were |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5328 // not copied during the pause. |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5329 process_discovered_references(); |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5330 |
|
1974
fd1d227ef1b9
6983204: G1: Nightly test nsk/regression/b4958615 failing with +ExplicitGCInvokesConcurrent
johnc
parents:
1973
diff
changeset
|
5331 // Weak root processing. |
|
fd1d227ef1b9
6983204: G1: Nightly test nsk/regression/b4958615 failing with +ExplicitGCInvokesConcurrent
johnc
parents:
1973
diff
changeset
|
5332 // 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
|
5333 // 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
|
5334 // here too. |
| 342 | 5335 { |
|
3979
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5336 G1STWIsAliveClosure is_alive(this); |
| 342 | 5337 G1KeepAliveClosure keep_alive(this); |
| 5338 JNIHandles::weak_oops_do(&is_alive, &keep_alive); | |
| 5339 } | |
|
3979
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5340 |
|
3830
f44782f04dd4
7039627: G1: avoid BOT updates for survivor allocations and dirty survivor regions incrementally
tonyp
parents:
3824
diff
changeset
|
5341 release_gc_alloc_regions(); |
| 342 | 5342 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
|
5343 |
| 889 | 5344 concurrent_g1_refine()->clear_hot_cache(); |
| 342 | 5345 concurrent_g1_refine()->set_use_cache(true); |
| 5346 | |
| 5347 finalize_for_evac_failure(); | |
| 5348 | |
| 5349 if (evacuation_failed()) { | |
| 5350 remove_self_forwarding_pointers(); | |
| 5351 if (PrintGCDetails) { | |
|
1719
b63010841f78
6975964: G1: print out a more descriptive message for evacuation failure when +PrintGCDetails is set
tonyp
parents:
1718
diff
changeset
|
5352 gclog_or_tty->print(" (to-space overflow)"); |
| 342 | 5353 } else if (PrintGC) { |
| 5354 gclog_or_tty->print("--"); | |
| 5355 } | |
| 5356 } | |
| 5357 | |
|
3979
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5358 // Enqueue any remaining references remaining on the STW |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5359 // reference processor's discovered lists. We need to do |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5360 // this after the card table is cleaned (and verified) as |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5361 // the act of enqueuing entries on to the pending list |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5362 // will log these updates (and dirty their associated |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5363 // cards). We need these updates logged to update any |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5364 // RSets. |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5365 enqueue_discovered_references(); |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
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|
5366 |
|
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|
5367 if (G1DeferredRSUpdate) { |
|
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|
5368 RedirtyLoggedCardTableEntryFastClosure redirty; |
|
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diff
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|
5369 dirty_card_queue_set().set_closure(&redirty); |
|
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|
5370 dirty_card_queue_set().apply_closure_to_all_completed_buffers(); |
| 1111 | 5371 |
| 5372 DirtyCardQueueSet& dcq = JavaThread::dirty_card_queue_set(); | |
| 5373 dcq.merge_bufferlists(&dirty_card_queue_set()); | |
|
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|
5374 assert(dirty_card_queue_set().completed_buffers_num() == 0, "All should be consumed"); |
|
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|
5375 } |
| 342 | 5376 COMPILER2_PRESENT(DerivedPointerTable::update_pointers()); |
| 5377 } | |
| 5378 | |
| 2173 | 5379 void G1CollectedHeap::free_region_if_empty(HeapRegion* hr, |
| 2152 | 5380 size_t* pre_used, |
| 5381 FreeRegionList* free_list, | |
| 4072 | 5382 OldRegionSet* old_proxy_set, |
| 2152 | 5383 HumongousRegionSet* humongous_proxy_set, |
| 2173 | 5384 HRRSCleanupTask* hrrs_cleanup_task, |
| 2152 | 5385 bool par) { |
| 5386 if (hr->used() > 0 && hr->max_live_bytes() == 0 && !hr->is_young()) { | |
| 5387 if (hr->isHumongous()) { | |
| 5388 assert(hr->startsHumongous(), "we should only see starts humongous"); | |
| 5389 free_humongous_region(hr, pre_used, free_list, humongous_proxy_set, par); | |
| 5390 } else { | |
| 4072 | 5391 _old_set.remove_with_proxy(hr, old_proxy_set); |
| 2152 | 5392 free_region(hr, pre_used, free_list, par); |
| 342 | 5393 } |
| 2173 | 5394 } else { |
| 5395 hr->rem_set()->do_cleanup_work(hrrs_cleanup_task); | |
| 342 | 5396 } |
| 5397 } | |
| 5398 | |
| 2152 | 5399 void G1CollectedHeap::free_region(HeapRegion* hr, |
| 5400 size_t* pre_used, | |
| 5401 FreeRegionList* free_list, | |
| 5402 bool par) { | |
| 5403 assert(!hr->isHumongous(), "this is only for non-humongous regions"); | |
| 5404 assert(!hr->is_empty(), "the region should not be empty"); | |
| 5405 assert(free_list != NULL, "pre-condition"); | |
| 5406 | |
| 5407 *pre_used += hr->used(); | |
| 5408 hr->hr_clear(par, true /* clear_space */); | |
|
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|
5409 free_list->add_as_head(hr); |
| 2152 | 5410 } |
| 5411 | |
| 5412 void G1CollectedHeap::free_humongous_region(HeapRegion* hr, | |
| 5413 size_t* pre_used, | |
| 5414 FreeRegionList* free_list, | |
| 5415 HumongousRegionSet* humongous_proxy_set, | |
| 5416 bool par) { | |
| 5417 assert(hr->startsHumongous(), "this is only for starts humongous regions"); | |
| 5418 assert(free_list != NULL, "pre-condition"); | |
| 5419 assert(humongous_proxy_set != NULL, "pre-condition"); | |
| 5420 | |
| 5421 size_t hr_used = hr->used(); | |
| 5422 size_t hr_capacity = hr->capacity(); | |
| 5423 size_t hr_pre_used = 0; | |
| 5424 _humongous_set.remove_with_proxy(hr, humongous_proxy_set); | |
| 5425 hr->set_notHumongous(); | |
| 5426 free_region(hr, &hr_pre_used, free_list, par); | |
| 5427 | |
| 3766 | 5428 size_t i = hr->hrs_index() + 1; |
| 2152 | 5429 size_t num = 1; |
| 3766 | 5430 while (i < n_regions()) { |
| 5431 HeapRegion* curr_hr = region_at(i); | |
| 2152 | 5432 if (!curr_hr->continuesHumongous()) { |
| 5433 break; | |
| 5434 } | |
| 5435 curr_hr->set_notHumongous(); | |
| 5436 free_region(curr_hr, &hr_pre_used, free_list, par); | |
| 5437 num += 1; | |
| 5438 i += 1; | |
| 5439 } | |
| 5440 assert(hr_pre_used == hr_used, | |
| 5441 err_msg("hr_pre_used: "SIZE_FORMAT" and hr_used: "SIZE_FORMAT" " | |
| 5442 "should be the same", hr_pre_used, hr_used)); | |
| 5443 *pre_used += hr_pre_used; | |
| 5444 } | |
| 5445 | |
| 5446 void G1CollectedHeap::update_sets_after_freeing_regions(size_t pre_used, | |
| 5447 FreeRegionList* free_list, | |
| 4072 | 5448 OldRegionSet* old_proxy_set, |
| 2152 | 5449 HumongousRegionSet* humongous_proxy_set, |
| 5450 bool par) { | |
| 5451 if (pre_used > 0) { | |
| 5452 Mutex* lock = (par) ? ParGCRareEvent_lock : NULL; | |
| 342 | 5453 MutexLockerEx x(lock, Mutex::_no_safepoint_check_flag); |
| 2152 | 5454 assert(_summary_bytes_used >= pre_used, |
| 5455 err_msg("invariant: _summary_bytes_used: "SIZE_FORMAT" " | |
| 5456 "should be >= pre_used: "SIZE_FORMAT, | |
| 5457 _summary_bytes_used, pre_used)); | |
| 342 | 5458 _summary_bytes_used -= pre_used; |
| 2152 | 5459 } |
| 5460 if (free_list != NULL && !free_list->is_empty()) { | |
| 5461 MutexLockerEx x(FreeList_lock, Mutex::_no_safepoint_check_flag); | |
|
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|
5462 _free_list.add_as_head(free_list); |
| 2152 | 5463 } |
| 4072 | 5464 if (old_proxy_set != NULL && !old_proxy_set->is_empty()) { |
| 5465 MutexLockerEx x(OldSets_lock, Mutex::_no_safepoint_check_flag); | |
| 5466 _old_set.update_from_proxy(old_proxy_set); | |
| 5467 } | |
| 2152 | 5468 if (humongous_proxy_set != NULL && !humongous_proxy_set->is_empty()) { |
| 5469 MutexLockerEx x(OldSets_lock, Mutex::_no_safepoint_check_flag); | |
| 5470 _humongous_set.update_from_proxy(humongous_proxy_set); | |
| 342 | 5471 } |
| 5472 } | |
| 5473 | |
|
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|
5474 class G1ParCleanupCTTask : public AbstractGangTask { |
|
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|
5475 CardTableModRefBS* _ct_bs; |
|
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|
5476 G1CollectedHeap* _g1h; |
|
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|
5477 HeapRegion* volatile _su_head; |
|
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|
5478 public: |
|
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|
5479 G1ParCleanupCTTask(CardTableModRefBS* ct_bs, |
|
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|
5480 G1CollectedHeap* g1h) : |
|
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|
5481 AbstractGangTask("G1 Par Cleanup CT Task"), |
|
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|
5482 _ct_bs(ct_bs), _g1h(g1h) { } |
|
796
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|
5483 |
|
4728
441e946dc1af
7121618: Change type of number of GC workers to unsigned int.
jmasa
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diff
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|
5484 void work(uint worker_id) { |
|
796
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|
5485 HeapRegion* r; |
|
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|
5486 while (r = _g1h->pop_dirty_cards_region()) { |
|
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|
5487 clear_cards(r); |
|
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|
5488 } |
|
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|
5489 } |
|
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|
5490 |
|
796
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|
5491 void clear_cards(HeapRegion* r) { |
|
3830
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|
5492 // Cards of the survivors should have already been dirtied. |
|
1394
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|
5493 if (!r->is_survivor()) { |
|
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|
5494 _ct_bs->clear(MemRegion(r->bottom(), r->end())); |
|
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|
5495 } |
|
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|
5496 } |
|
29e7d79232b9
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|
5497 }; |
|
29e7d79232b9
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|
5498 |
|
940
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6841313: G1: dirty cards of survivor regions in parallel
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diff
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|
5499 #ifndef PRODUCT |
|
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6841313: G1: dirty cards of survivor regions in parallel
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diff
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|
5500 class G1VerifyCardTableCleanup: public HeapRegionClosure { |
|
3317
063382f9b575
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3293
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|
5501 G1CollectedHeap* _g1h; |
|
940
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|
5502 CardTableModRefBS* _ct_bs; |
|
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diff
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|
5503 public: |
|
3317
063382f9b575
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|
5504 G1VerifyCardTableCleanup(G1CollectedHeap* g1h, CardTableModRefBS* ct_bs) |
|
063382f9b575
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|
5505 : _g1h(g1h), _ct_bs(ct_bs) { } |
|
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2432
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|
5506 virtual bool doHeapRegion(HeapRegion* r) { |
|
1394
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|
5507 if (r->is_survivor()) { |
|
3317
063382f9b575
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changeset
|
5508 _g1h->verify_dirty_region(r); |
|
940
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diff
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|
5509 } else { |
|
3317
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|
5510 _g1h->verify_not_dirty_region(r); |
|
940
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diff
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|
5511 } |
|
8624da129f0b
6841313: G1: dirty cards of survivor regions in parallel
apetrusenko
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diff
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|
5512 return false; |
|
8624da129f0b
6841313: G1: dirty cards of survivor regions in parallel
apetrusenko
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936
diff
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|
5513 } |
|
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|
5514 }; |
|
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|
5515 |
|
3317
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|
5516 void G1CollectedHeap::verify_not_dirty_region(HeapRegion* hr) { |
|
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|
5517 // All of the region should be clean. |
|
063382f9b575
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|
5518 CardTableModRefBS* ct_bs = (CardTableModRefBS*)barrier_set(); |
|
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|
5519 MemRegion mr(hr->bottom(), hr->end()); |
|
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|
5520 ct_bs->verify_not_dirty_region(mr); |
|
063382f9b575
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|
5521 } |
|
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|
5522 |
|
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|
5523 void G1CollectedHeap::verify_dirty_region(HeapRegion* hr) { |
|
063382f9b575
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|
5524 // We cannot guarantee that [bottom(),end()] is dirty. Threads |
|
063382f9b575
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|
5525 // dirty allocated blocks as they allocate them. The thread that |
|
063382f9b575
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|
5526 // retires each region and replaces it with a new one will do a |
|
063382f9b575
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|
5527 // maximal allocation to fill in [pre_dummy_top(),end()] but will |
|
063382f9b575
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|
5528 // not dirty that area (one less thing to have to do while holding |
|
063382f9b575
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|
5529 // a lock). So we can only verify that [bottom(),pre_dummy_top()] |
|
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|
5530 // is dirty. |
|
063382f9b575
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|
5531 CardTableModRefBS* ct_bs = (CardTableModRefBS*) barrier_set(); |
|
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|
5532 MemRegion mr(hr->bottom(), hr->pre_dummy_top()); |
|
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|
5533 ct_bs->verify_dirty_region(mr); |
|
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|
5534 } |
|
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|
5535 |
|
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|
5536 void G1CollectedHeap::verify_dirty_young_list(HeapRegion* head) { |
|
3317
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|
5537 CardTableModRefBS* ct_bs = (CardTableModRefBS*) barrier_set(); |
|
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|
5538 for (HeapRegion* hr = head; hr != NULL; hr = hr->get_next_young_region()) { |
|
3317
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|
5539 verify_dirty_region(hr); |
|
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|
5540 } |
|
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|
5541 } |
|
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|
5542 |
|
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|
5543 void G1CollectedHeap::verify_dirty_young_regions() { |
|
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|
5544 verify_dirty_young_list(_young_list->first_region()); |
|
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|
5545 verify_dirty_young_list(_young_list->first_survivor_region()); |
|
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|
5546 } |
|
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|
5547 #endif |
|
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|
5548 |
| 342 | 5549 void G1CollectedHeap::cleanUpCardTable() { |
| 5550 CardTableModRefBS* ct_bs = (CardTableModRefBS*) (barrier_set()); | |
| 5551 double start = os::elapsedTime(); | |
| 5552 | |
| 4023 | 5553 { |
| 5554 // Iterate over the dirty cards region list. | |
| 5555 G1ParCleanupCTTask cleanup_task(ct_bs, this); | |
| 5556 | |
| 4711 | 5557 if (G1CollectedHeap::use_parallel_gc_threads()) { |
| 5558 set_par_threads(); | |
| 4023 | 5559 workers()->run_task(&cleanup_task); |
| 5560 set_par_threads(0); | |
| 5561 } else { | |
| 5562 while (_dirty_cards_region_list) { | |
| 5563 HeapRegion* r = _dirty_cards_region_list; | |
| 5564 cleanup_task.clear_cards(r); | |
| 5565 _dirty_cards_region_list = r->get_next_dirty_cards_region(); | |
| 5566 if (_dirty_cards_region_list == r) { | |
| 5567 // The last region. | |
| 5568 _dirty_cards_region_list = NULL; | |
| 5569 } | |
| 5570 r->set_next_dirty_cards_region(NULL); | |
|
796
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|
5571 } |
|
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|
5572 } |
| 4023 | 5573 #ifndef PRODUCT |
| 5574 if (G1VerifyCTCleanup || VerifyAfterGC) { | |
| 5575 G1VerifyCardTableCleanup cleanup_verifier(this, ct_bs); | |
| 5576 heap_region_iterate(&cleanup_verifier); | |
| 5577 } | |
| 5578 #endif | |
|
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|
5579 } |
|
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|
5580 |
| 342 | 5581 double elapsed = os::elapsedTime() - start; |
|
3979
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|
5582 g1_policy()->record_clear_ct_time(elapsed * 1000.0); |
| 342 | 5583 } |
| 5584 | |
| 5585 void G1CollectedHeap::free_collection_set(HeapRegion* cs_head) { | |
| 2152 | 5586 size_t pre_used = 0; |
| 5587 FreeRegionList local_free_list("Local List for CSet Freeing"); | |
| 5588 | |
| 342 | 5589 double young_time_ms = 0.0; |
| 5590 double non_young_time_ms = 0.0; | |
| 5591 | |
|
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|
5592 // Since the collection set is a superset of the the young list, |
|
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|
5593 // all we need to do to clear the young list is clear its |
|
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|
5594 // head and length, and unlink any young regions in the code below |
|
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|
5595 _young_list->clear(); |
|
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|
5596 |
| 342 | 5597 G1CollectorPolicy* policy = g1_policy(); |
| 5598 | |
| 5599 double start_sec = os::elapsedTime(); | |
| 5600 bool non_young = true; | |
| 5601 | |
| 5602 HeapRegion* cur = cs_head; | |
| 5603 int age_bound = -1; | |
| 5604 size_t rs_lengths = 0; | |
| 5605 | |
| 5606 while (cur != NULL) { | |
| 2361 | 5607 assert(!is_on_master_free_list(cur), "sanity"); |
| 342 | 5608 if (non_young) { |
| 5609 if (cur->is_young()) { | |
| 5610 double end_sec = os::elapsedTime(); | |
| 5611 double elapsed_ms = (end_sec - start_sec) * 1000.0; | |
| 5612 non_young_time_ms += elapsed_ms; | |
| 5613 | |
| 5614 start_sec = os::elapsedTime(); | |
| 5615 non_young = false; | |
| 5616 } | |
| 5617 } else { | |
|
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|
5618 if (!cur->is_young()) { |
|
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|
5619 double end_sec = os::elapsedTime(); |
|
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|
5620 double elapsed_ms = (end_sec - start_sec) * 1000.0; |
|
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|
5621 young_time_ms += elapsed_ms; |
|
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|
5622 |
|
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|
5623 start_sec = os::elapsedTime(); |
|
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|
5624 non_young = true; |
|
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|
5625 } |
| 342 | 5626 } |
| 5627 | |
| 5628 rs_lengths += cur->rem_set()->occupied(); | |
| 5629 | |
| 5630 HeapRegion* next = cur->next_in_collection_set(); | |
| 5631 assert(cur->in_collection_set(), "bad CS"); | |
| 5632 cur->set_next_in_collection_set(NULL); | |
| 5633 cur->set_in_collection_set(false); | |
| 5634 | |
| 5635 if (cur->is_young()) { | |
| 5636 int index = cur->young_index_in_cset(); | |
|
4090
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|
5637 assert(index != -1, "invariant"); |
|
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|
5638 assert((size_t) index < policy->young_cset_region_length(), "invariant"); |
| 342 | 5639 size_t words_survived = _surviving_young_words[index]; |
| 5640 cur->record_surv_words_in_group(words_survived); | |
|
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|
5641 |
|
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|
5642 // At this point the we have 'popped' cur from the collection set |
|
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|
5643 // (linked via next_in_collection_set()) but it is still in the |
|
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|
5644 // young list (linked via next_young_region()). Clear the |
|
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|
5645 // _next_young_region field. |
|
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|
5646 cur->set_next_young_region(NULL); |
| 342 | 5647 } else { |
| 5648 int index = cur->young_index_in_cset(); | |
|
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|
5649 assert(index == -1, "invariant"); |
| 342 | 5650 } |
| 5651 | |
| 5652 assert( (cur->is_young() && cur->young_index_in_cset() > -1) || | |
| 5653 (!cur->is_young() && cur->young_index_in_cset() == -1), | |
| 5654 "invariant" ); | |
| 5655 | |
| 5656 if (!cur->evacuation_failed()) { | |
|
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|
5657 MemRegion used_mr = cur->used_region(); |
|
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|
5658 |
| 342 | 5659 // And the region is empty. |
|
4097
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|
5660 assert(!used_mr.is_empty(), "Should not have empty regions in a CS."); |
|
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|
5661 |
|
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|
5662 // If marking is in progress then clear any objects marked in |
|
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7112743: G1: Reduce overhead of marking closure during evacuation pauses
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|
5663 // the current region. Note mark_in_progress() returns false, |
|
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|
5664 // even during an initial mark pause, until the set_marking_started() |
|
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|
5665 // call which takes place later in the pause. |
|
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|
5666 if (mark_in_progress()) { |
|
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|
5667 assert(!g1_policy()->during_initial_mark_pause(), "sanity"); |
|
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|
5668 _cm->nextMarkBitMap()->clearRange(used_mr); |
|
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7112743: G1: Reduce overhead of marking closure during evacuation pauses
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|
5669 } |
|
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diff
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|
5670 |
| 2152 | 5671 free_region(cur, &pre_used, &local_free_list, false /* par */); |
| 342 | 5672 } else { |
| 5673 cur->uninstall_surv_rate_group(); | |
|
4090
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|
5674 if (cur->is_young()) { |
| 342 | 5675 cur->set_young_index_in_cset(-1); |
|
4090
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|
5676 } |
| 342 | 5677 cur->set_not_young(); |
| 5678 cur->set_evacuation_failed(false); | |
| 4072 | 5679 // The region is now considered to be old. |
| 5680 _old_set.add(cur); | |
| 342 | 5681 } |
| 5682 cur = next; | |
| 5683 } | |
| 5684 | |
| 5685 policy->record_max_rs_lengths(rs_lengths); | |
| 5686 policy->cset_regions_freed(); | |
| 5687 | |
| 5688 double end_sec = os::elapsedTime(); | |
| 5689 double elapsed_ms = (end_sec - start_sec) * 1000.0; | |
|
4097
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|
5690 |
|
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changeset
|
5691 if (non_young) { |
| 342 | 5692 non_young_time_ms += elapsed_ms; |
|
4097
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|
5693 } else { |
| 342 | 5694 young_time_ms += elapsed_ms; |
|
4097
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|
5695 } |
| 342 | 5696 |
| 2152 | 5697 update_sets_after_freeing_regions(pre_used, &local_free_list, |
| 4072 | 5698 NULL /* old_proxy_set */, |
| 2152 | 5699 NULL /* humongous_proxy_set */, |
| 5700 false /* par */); | |
| 342 | 5701 policy->record_young_free_cset_time_ms(young_time_ms); |
| 5702 policy->record_non_young_free_cset_time_ms(non_young_time_ms); | |
| 5703 } | |
| 5704 | |
|
1394
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|
5705 // This routine is similar to the above but does not record |
|
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|
5706 // any policy statistics or update free lists; we are abandoning |
|
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6819061: G1: eliminate serial Other times that are proportional to the collection set length
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|
5707 // the current incremental collection set in preparation of a |
|
1316cec51b4d
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|
5708 // full collection. After the full GC we will start to build up |
|
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diff
changeset
|
5709 // the incremental collection set again. |
|
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
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diff
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|
5710 // This is only called when we're doing a full collection |
|
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diff
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|
5711 // and is immediately followed by the tearing down of the young list. |
|
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|
5712 |
|
1316cec51b4d
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changeset
|
5713 void G1CollectedHeap::abandon_collection_set(HeapRegion* cs_head) { |
|
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|
5714 HeapRegion* cur = cs_head; |
|
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6819061: G1: eliminate serial Other times that are proportional to the collection set length
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|
5715 |
|
1316cec51b4d
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diff
changeset
|
5716 while (cur != NULL) { |
|
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diff
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|
5717 HeapRegion* next = cur->next_in_collection_set(); |
|
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|
5718 assert(cur->in_collection_set(), "bad CS"); |
|
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|
5719 cur->set_next_in_collection_set(NULL); |
|
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|
5720 cur->set_in_collection_set(false); |
|
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diff
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|
5721 cur->set_young_index_in_cset(-1); |
|
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|
5722 cur = next; |
|
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|
5723 } |
|
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|
5724 } |
|
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|
5725 |
| 2152 | 5726 void G1CollectedHeap::set_free_regions_coming() { |
| 5727 if (G1ConcRegionFreeingVerbose) { | |
| 5728 gclog_or_tty->print_cr("G1ConcRegionFreeing [cm thread] : " | |
| 5729 "setting free regions coming"); | |
| 5730 } | |
| 5731 | |
| 5732 assert(!free_regions_coming(), "pre-condition"); | |
| 5733 _free_regions_coming = true; | |
| 342 | 5734 } |
| 5735 | |
| 2152 | 5736 void G1CollectedHeap::reset_free_regions_coming() { |
| 5737 { | |
| 5738 assert(free_regions_coming(), "pre-condition"); | |
| 5739 MutexLockerEx x(SecondaryFreeList_lock, Mutex::_no_safepoint_check_flag); | |
| 5740 _free_regions_coming = false; | |
| 5741 SecondaryFreeList_lock->notify_all(); | |
| 5742 } | |
| 5743 | |
| 5744 if (G1ConcRegionFreeingVerbose) { | |
| 5745 gclog_or_tty->print_cr("G1ConcRegionFreeing [cm thread] : " | |
| 5746 "reset free regions coming"); | |
| 342 | 5747 } |
| 5748 } | |
| 5749 | |
| 2152 | 5750 void G1CollectedHeap::wait_while_free_regions_coming() { |
| 5751 // Most of the time we won't have to wait, so let's do a quick test | |
| 5752 // first before we take the lock. | |
| 5753 if (!free_regions_coming()) { | |
| 5754 return; | |
| 5755 } | |
| 5756 | |
| 5757 if (G1ConcRegionFreeingVerbose) { | |
| 5758 gclog_or_tty->print_cr("G1ConcRegionFreeing [other] : " | |
| 5759 "waiting for free regions"); | |
| 342 | 5760 } |
| 5761 | |
| 5762 { | |
| 2152 | 5763 MutexLockerEx x(SecondaryFreeList_lock, Mutex::_no_safepoint_check_flag); |
| 5764 while (free_regions_coming()) { | |
| 5765 SecondaryFreeList_lock->wait(Mutex::_no_safepoint_check_flag); | |
| 342 | 5766 } |
| 2152 | 5767 } |
| 5768 | |
| 5769 if (G1ConcRegionFreeingVerbose) { | |
| 5770 gclog_or_tty->print_cr("G1ConcRegionFreeing [other] : " | |
| 5771 "done waiting for free regions"); | |
| 5772 } | |
| 342 | 5773 } |
| 5774 | |
| 5775 void G1CollectedHeap::set_region_short_lived_locked(HeapRegion* hr) { | |
| 5776 assert(heap_lock_held_for_gc(), | |
| 5777 "the heap lock should already be held by or for this thread"); | |
| 5778 _young_list->push_region(hr); | |
| 5779 } | |
| 5780 | |
| 5781 class NoYoungRegionsClosure: public HeapRegionClosure { | |
| 5782 private: | |
| 5783 bool _success; | |
| 5784 public: | |
| 5785 NoYoungRegionsClosure() : _success(true) { } | |
| 5786 bool doHeapRegion(HeapRegion* r) { | |
| 5787 if (r->is_young()) { | |
| 5788 gclog_or_tty->print_cr("Region ["PTR_FORMAT", "PTR_FORMAT") tagged as young", | |
| 5789 r->bottom(), r->end()); | |
| 5790 _success = false; | |
| 5791 } | |
| 5792 return false; | |
| 5793 } | |
| 5794 bool success() { return _success; } | |
| 5795 }; | |
| 5796 | |
|
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|
5797 bool G1CollectedHeap::check_young_list_empty(bool check_heap, bool check_sample) { |
|
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|
5798 bool ret = _young_list->check_list_empty(check_sample); |
|
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|
5799 |
|
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|
5800 if (check_heap) { |
| 342 | 5801 NoYoungRegionsClosure closure; |
| 5802 heap_region_iterate(&closure); | |
| 5803 ret = ret && closure.success(); | |
| 5804 } | |
| 5805 | |
| 5806 return ret; | |
| 5807 } | |
| 5808 | |
| 4072 | 5809 class TearDownRegionSetsClosure : public HeapRegionClosure { |
| 5810 private: | |
| 5811 OldRegionSet *_old_set; | |
| 2152 | 5812 |
| 342 | 5813 public: |
| 4072 | 5814 TearDownRegionSetsClosure(OldRegionSet* old_set) : _old_set(old_set) { } |
| 2152 | 5815 |
| 342 | 5816 bool doHeapRegion(HeapRegion* r) { |
| 4072 | 5817 if (r->is_empty()) { |
| 5818 // We ignore empty regions, we'll empty the free list afterwards | |
| 5819 } else if (r->is_young()) { | |
| 5820 // We ignore young regions, we'll empty the young list afterwards | |
| 5821 } else if (r->isHumongous()) { | |
| 5822 // We ignore humongous regions, we're not tearing down the | |
| 5823 // humongous region set | |
| 342 | 5824 } else { |
| 4072 | 5825 // The rest should be old |
| 5826 _old_set->remove(r); | |
| 342 | 5827 } |
| 5828 return false; | |
| 5829 } | |
| 5830 | |
| 4072 | 5831 ~TearDownRegionSetsClosure() { |
| 5832 assert(_old_set->is_empty(), "post-condition"); | |
| 2152 | 5833 } |
| 342 | 5834 }; |
| 5835 | |
| 4072 | 5836 void G1CollectedHeap::tear_down_region_sets(bool free_list_only) { |
| 5837 assert_at_safepoint(true /* should_be_vm_thread */); | |
| 5838 | |
| 5839 if (!free_list_only) { | |
| 5840 TearDownRegionSetsClosure cl(&_old_set); | |
| 5841 heap_region_iterate(&cl); | |
| 5842 | |
| 5843 // Need to do this after the heap iteration to be able to | |
| 5844 // recognize the young regions and ignore them during the iteration. | |
| 5845 _young_list->empty_list(); | |
| 5846 } | |
| 5847 _free_list.remove_all(); | |
| 5848 } | |
| 5849 | |
| 5850 class RebuildRegionSetsClosure : public HeapRegionClosure { | |
| 5851 private: | |
| 5852 bool _free_list_only; | |
| 5853 OldRegionSet* _old_set; | |
| 5854 FreeRegionList* _free_list; | |
| 5855 size_t _total_used; | |
| 5856 | |
| 5857 public: | |
| 5858 RebuildRegionSetsClosure(bool free_list_only, | |
| 5859 OldRegionSet* old_set, FreeRegionList* free_list) : | |
| 5860 _free_list_only(free_list_only), | |
| 5861 _old_set(old_set), _free_list(free_list), _total_used(0) { | |
| 5862 assert(_free_list->is_empty(), "pre-condition"); | |
| 5863 if (!free_list_only) { | |
| 5864 assert(_old_set->is_empty(), "pre-condition"); | |
| 5865 } | |
| 5866 } | |
| 5867 | |
| 5868 bool doHeapRegion(HeapRegion* r) { | |
| 5869 if (r->continuesHumongous()) { | |
| 5870 return false; | |
| 5871 } | |
| 5872 | |
| 5873 if (r->is_empty()) { | |
| 5874 // Add free regions to the free list | |
| 5875 _free_list->add_as_tail(r); | |
| 5876 } else if (!_free_list_only) { | |
| 5877 assert(!r->is_young(), "we should not come across young regions"); | |
| 5878 | |
| 5879 if (r->isHumongous()) { | |
| 5880 // We ignore humongous regions, we left the humongous set unchanged | |
| 5881 } else { | |
| 5882 // The rest should be old, add them to the old set | |
| 5883 _old_set->add(r); | |
| 5884 } | |
| 5885 _total_used += r->used(); | |
| 5886 } | |
| 5887 | |
| 5888 return false; | |
| 5889 } | |
| 5890 | |
| 5891 size_t total_used() { | |
| 5892 return _total_used; | |
| 5893 } | |
| 5894 }; | |
| 5895 | |
| 5896 void G1CollectedHeap::rebuild_region_sets(bool free_list_only) { | |
| 5897 assert_at_safepoint(true /* should_be_vm_thread */); | |
| 5898 | |
| 5899 RebuildRegionSetsClosure cl(free_list_only, &_old_set, &_free_list); | |
| 5900 heap_region_iterate(&cl); | |
| 5901 | |
| 5902 if (!free_list_only) { | |
| 5903 _summary_bytes_used = cl.total_used(); | |
| 5904 } | |
| 5905 assert(_summary_bytes_used == recalculate_used(), | |
| 5906 err_msg("inconsistent _summary_bytes_used, " | |
| 5907 "value: "SIZE_FORMAT" recalculated: "SIZE_FORMAT, | |
| 5908 _summary_bytes_used, recalculate_used())); | |
| 342 | 5909 } |
| 5910 | |
| 5911 void G1CollectedHeap::set_refine_cte_cl_concurrency(bool concurrent) { | |
| 5912 _refine_cte_cl->set_concurrent(concurrent); | |
| 5913 } | |
| 5914 | |
| 5915 bool G1CollectedHeap::is_in_closed_subset(const void* p) const { | |
| 5916 HeapRegion* hr = heap_region_containing(p); | |
| 5917 if (hr == NULL) { | |
| 5918 return is_in_permanent(p); | |
| 5919 } else { | |
| 5920 return hr->is_in(p); | |
| 5921 } | |
| 5922 } | |
| 2152 | 5923 |
|
3830
f44782f04dd4
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parents:
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diff
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|
5924 // 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
changeset
|
5925 |
|
2433
abdfc822206f
7023069: G1: Introduce symmetric locking in the slow allocation path
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diff
changeset
|
5926 HeapRegion* G1CollectedHeap::new_mutator_alloc_region(size_t word_size, |
|
abdfc822206f
7023069: G1: Introduce symmetric locking in the slow allocation path
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parents:
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diff
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|
5927 bool force) { |
|
abdfc822206f
7023069: G1: Introduce symmetric locking in the slow allocation path
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parents:
2432
diff
changeset
|
5928 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
|
5929 assert(!force || g1_policy()->can_expand_young_list(), |
|
abdfc822206f
7023069: G1: Introduce symmetric locking in the slow allocation path
tonyp
parents:
2432
diff
changeset
|
5930 "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
|
5931 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
|
5932 if (force || !young_list_full) { |
|
2433
abdfc822206f
7023069: G1: Introduce symmetric locking in the slow allocation path
tonyp
parents:
2432
diff
changeset
|
5933 HeapRegion* new_alloc_region = new_region(word_size, |
|
abdfc822206f
7023069: G1: Introduce symmetric locking in the slow allocation path
tonyp
parents:
2432
diff
changeset
|
5934 false /* do_expand */); |
|
abdfc822206f
7023069: G1: Introduce symmetric locking in the slow allocation path
tonyp
parents:
2432
diff
changeset
|
5935 if (new_alloc_region != NULL) { |
|
abdfc822206f
7023069: G1: Introduce symmetric locking in the slow allocation path
tonyp
parents:
2432
diff
changeset
|
5936 set_region_short_lived_locked(new_alloc_region); |
|
3778
5f6f2615433a
7049999: G1: Make the G1PrintHeapRegions output consistent and complete
tonyp
parents:
3777
diff
changeset
|
5937 _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
|
5938 return new_alloc_region; |
|
abdfc822206f
7023069: G1: Introduce symmetric locking in the slow allocation path
tonyp
parents:
2432
diff
changeset
|
5939 } |
|
abdfc822206f
7023069: G1: Introduce symmetric locking in the slow allocation path
tonyp
parents:
2432
diff
changeset
|
5940 } |
|
abdfc822206f
7023069: G1: Introduce symmetric locking in the slow allocation path
tonyp
parents:
2432
diff
changeset
|
5941 return NULL; |
|
abdfc822206f
7023069: G1: Introduce symmetric locking in the slow allocation path
tonyp
parents:
2432
diff
changeset
|
5942 } |
|
abdfc822206f
7023069: G1: Introduce symmetric locking in the slow allocation path
tonyp
parents:
2432
diff
changeset
|
5943 |
|
abdfc822206f
7023069: G1: Introduce symmetric locking in the slow allocation path
tonyp
parents:
2432
diff
changeset
|
5944 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
|
5945 size_t allocated_bytes) { |
|
abdfc822206f
7023069: G1: Introduce symmetric locking in the slow allocation path
tonyp
parents:
2432
diff
changeset
|
5946 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
|
5947 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
|
5948 |
|
abdfc822206f
7023069: G1: Introduce symmetric locking in the slow allocation path
tonyp
parents:
2432
diff
changeset
|
5949 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
|
5950 _summary_bytes_used += allocated_bytes; |
|
3778
5f6f2615433a
7049999: G1: Make the G1PrintHeapRegions output consistent and complete
tonyp
parents:
3777
diff
changeset
|
5951 _hr_printer.retire(alloc_region); |
|
3980
8229bd737950
7075646: G1: fix inconsistencies in the monitoring data
tonyp
parents:
3979
diff
changeset
|
5952 // 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
|
5953 // 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
|
5954 // used space has been recored in _summary_bytes_used. |
|
8229bd737950
7075646: G1: fix inconsistencies in the monitoring data
tonyp
parents:
3979
diff
changeset
|
5955 g1mm()->update_eden_size(); |
|
2433
abdfc822206f
7023069: G1: Introduce symmetric locking in the slow allocation path
tonyp
parents:
2432
diff
changeset
|
5956 } |
|
abdfc822206f
7023069: G1: Introduce symmetric locking in the slow allocation path
tonyp
parents:
2432
diff
changeset
|
5957 |
|
abdfc822206f
7023069: G1: Introduce symmetric locking in the slow allocation path
tonyp
parents:
2432
diff
changeset
|
5958 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
|
5959 bool force) { |
|
abdfc822206f
7023069: G1: Introduce symmetric locking in the slow allocation path
tonyp
parents:
2432
diff
changeset
|
5960 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
|
5961 } |
|
abdfc822206f
7023069: G1: Introduce symmetric locking in the slow allocation path
tonyp
parents:
2432
diff
changeset
|
5962 |
|
4095
bca17e38de00
6593758: RFE: Enhance GC ergonomics to dynamically choose ParallelGCThreads
jmasa
parents:
4090
diff
changeset
|
5963 void G1CollectedHeap::set_par_threads() { |
|
bca17e38de00
6593758: RFE: Enhance GC ergonomics to dynamically choose ParallelGCThreads
jmasa
parents:
4090
diff
changeset
|
5964 // 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
|
5965 // in the workgroup. |
| 4711 | 5966 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
|
5967 uint n_workers = workers()->active_workers(); |
| 4711 | 5968 assert(UseDynamicNumberOfGCThreads || |
|
4095
bca17e38de00
6593758: RFE: Enhance GC ergonomics to dynamically choose ParallelGCThreads
jmasa
parents:
4090
diff
changeset
|
5969 n_workers == workers()->total_workers(), |
|
bca17e38de00
6593758: RFE: Enhance GC ergonomics to dynamically choose ParallelGCThreads
jmasa
parents:
4090
diff
changeset
|
5970 "Otherwise should be using the total number of workers"); |
|
bca17e38de00
6593758: RFE: Enhance GC ergonomics to dynamically choose ParallelGCThreads
jmasa
parents:
4090
diff
changeset
|
5971 if (n_workers == 0) { |
|
bca17e38de00
6593758: RFE: Enhance GC ergonomics to dynamically choose ParallelGCThreads
jmasa
parents:
4090
diff
changeset
|
5972 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
|
5973 n_workers = ParallelGCThreads; |
|
bca17e38de00
6593758: RFE: Enhance GC ergonomics to dynamically choose ParallelGCThreads
jmasa
parents:
4090
diff
changeset
|
5974 workers()->set_active_workers(n_workers); |
|
bca17e38de00
6593758: RFE: Enhance GC ergonomics to dynamically choose ParallelGCThreads
jmasa
parents:
4090
diff
changeset
|
5975 } |
|
bca17e38de00
6593758: RFE: Enhance GC ergonomics to dynamically choose ParallelGCThreads
jmasa
parents:
4090
diff
changeset
|
5976 set_par_threads(n_workers); |
|
bca17e38de00
6593758: RFE: Enhance GC ergonomics to dynamically choose ParallelGCThreads
jmasa
parents:
4090
diff
changeset
|
5977 } |
|
bca17e38de00
6593758: RFE: Enhance GC ergonomics to dynamically choose ParallelGCThreads
jmasa
parents:
4090
diff
changeset
|
5978 |
|
2433
abdfc822206f
7023069: G1: Introduce symmetric locking in the slow allocation path
tonyp
parents:
2432
diff
changeset
|
5979 void MutatorAllocRegion::retire_region(HeapRegion* alloc_region, |
|
abdfc822206f
7023069: G1: Introduce symmetric locking in the slow allocation path
tonyp
parents:
2432
diff
changeset
|
5980 size_t allocated_bytes) { |
|
abdfc822206f
7023069: G1: Introduce symmetric locking in the slow allocation path
tonyp
parents:
2432
diff
changeset
|
5981 _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
|
5982 } |
|
abdfc822206f
7023069: G1: Introduce symmetric locking in the slow allocation path
tonyp
parents:
2432
diff
changeset
|
5983 |
|
3830
f44782f04dd4
7039627: G1: avoid BOT updates for survivor allocations and dirty survivor regions incrementally
tonyp
parents:
3824
diff
changeset
|
5984 // Methods for the GC alloc regions |
|
f44782f04dd4
7039627: G1: avoid BOT updates for survivor allocations and dirty survivor regions incrementally
tonyp
parents:
3824
diff
changeset
|
5985 |
|
f44782f04dd4
7039627: G1: avoid BOT updates for survivor allocations and dirty survivor regions incrementally
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parents:
3824
diff
changeset
|
5986 HeapRegion* G1CollectedHeap::new_gc_alloc_region(size_t word_size, |
|
f44782f04dd4
7039627: G1: avoid BOT updates for survivor allocations and dirty survivor regions incrementally
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parents:
3824
diff
changeset
|
5987 size_t count, |
|
f44782f04dd4
7039627: G1: avoid BOT updates for survivor allocations and dirty survivor regions incrementally
tonyp
parents:
3824
diff
changeset
|
5988 GCAllocPurpose ap) { |
|
f44782f04dd4
7039627: G1: avoid BOT updates for survivor allocations and dirty survivor regions incrementally
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parents:
3824
diff
changeset
|
5989 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
|
5990 |
|
f44782f04dd4
7039627: G1: avoid BOT updates for survivor allocations and dirty survivor regions incrementally
tonyp
parents:
3824
diff
changeset
|
5991 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
|
5992 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
|
5993 true /* do_expand */); |
|
f44782f04dd4
7039627: G1: avoid BOT updates for survivor allocations and dirty survivor regions incrementally
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parents:
3824
diff
changeset
|
5994 if (new_alloc_region != NULL) { |
|
f44782f04dd4
7039627: G1: avoid BOT updates for survivor allocations and dirty survivor regions incrementally
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parents:
3824
diff
changeset
|
5995 // We really only need to do this for old regions given that we |
|
f44782f04dd4
7039627: G1: avoid BOT updates for survivor allocations and dirty survivor regions incrementally
tonyp
parents:
3824
diff
changeset
|
5996 // should never scan survivors. But it doesn't hurt to do it |
|
f44782f04dd4
7039627: G1: avoid BOT updates for survivor allocations and dirty survivor regions incrementally
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parents:
3824
diff
changeset
|
5997 // for survivors too. |
|
f44782f04dd4
7039627: G1: avoid BOT updates for survivor allocations and dirty survivor regions incrementally
tonyp
parents:
3824
diff
changeset
|
5998 new_alloc_region->set_saved_mark(); |
|
f44782f04dd4
7039627: G1: avoid BOT updates for survivor allocations and dirty survivor regions incrementally
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parents:
3824
diff
changeset
|
5999 if (ap == GCAllocForSurvived) { |
|
f44782f04dd4
7039627: G1: avoid BOT updates for survivor allocations and dirty survivor regions incrementally
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parents:
3824
diff
changeset
|
6000 new_alloc_region->set_survivor(); |
|
f44782f04dd4
7039627: G1: avoid BOT updates for survivor allocations and dirty survivor regions incrementally
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parents:
3824
diff
changeset
|
6001 _hr_printer.alloc(new_alloc_region, G1HRPrinter::Survivor); |
|
f44782f04dd4
7039627: G1: avoid BOT updates for survivor allocations and dirty survivor regions incrementally
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diff
changeset
|
6002 } else { |
|
f44782f04dd4
7039627: G1: avoid BOT updates for survivor allocations and dirty survivor regions incrementally
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parents:
3824
diff
changeset
|
6003 _hr_printer.alloc(new_alloc_region, G1HRPrinter::Old); |
|
f44782f04dd4
7039627: G1: avoid BOT updates for survivor allocations and dirty survivor regions incrementally
tonyp
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3824
diff
changeset
|
6004 } |
|
4787
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
4785
diff
changeset
|
6005 bool during_im = g1_policy()->during_initial_mark_pause(); |
|
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
4785
diff
changeset
|
6006 new_alloc_region->note_start_of_copying(during_im); |
|
3830
f44782f04dd4
7039627: G1: avoid BOT updates for survivor allocations and dirty survivor regions incrementally
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parents:
3824
diff
changeset
|
6007 return new_alloc_region; |
|
f44782f04dd4
7039627: G1: avoid BOT updates for survivor allocations and dirty survivor regions incrementally
tonyp
parents:
3824
diff
changeset
|
6008 } else { |
|
f44782f04dd4
7039627: G1: avoid BOT updates for survivor allocations and dirty survivor regions incrementally
tonyp
parents:
3824
diff
changeset
|
6009 g1_policy()->note_alloc_region_limit_reached(ap); |
|
f44782f04dd4
7039627: G1: avoid BOT updates for survivor allocations and dirty survivor regions incrementally
tonyp
parents:
3824
diff
changeset
|
6010 } |
|
f44782f04dd4
7039627: G1: avoid BOT updates for survivor allocations and dirty survivor regions incrementally
tonyp
parents:
3824
diff
changeset
|
6011 } |
|
f44782f04dd4
7039627: G1: avoid BOT updates for survivor allocations and dirty survivor regions incrementally
tonyp
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3824
diff
changeset
|
6012 return NULL; |
|
f44782f04dd4
7039627: G1: avoid BOT updates for survivor allocations and dirty survivor regions incrementally
tonyp
parents:
3824
diff
changeset
|
6013 } |
|
f44782f04dd4
7039627: G1: avoid BOT updates for survivor allocations and dirty survivor regions incrementally
tonyp
parents:
3824
diff
changeset
|
6014 |
|
f44782f04dd4
7039627: G1: avoid BOT updates for survivor allocations and dirty survivor regions incrementally
tonyp
parents:
3824
diff
changeset
|
6015 void G1CollectedHeap::retire_gc_alloc_region(HeapRegion* alloc_region, |
|
f44782f04dd4
7039627: G1: avoid BOT updates for survivor allocations and dirty survivor regions incrementally
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parents:
3824
diff
changeset
|
6016 size_t allocated_bytes, |
|
f44782f04dd4
7039627: G1: avoid BOT updates for survivor allocations and dirty survivor regions incrementally
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parents:
3824
diff
changeset
|
6017 GCAllocPurpose ap) { |
|
4787
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
4785
diff
changeset
|
6018 bool during_im = g1_policy()->during_initial_mark_pause(); |
|
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
4785
diff
changeset
|
6019 alloc_region->note_end_of_copying(during_im); |
|
3830
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6020 g1_policy()->record_bytes_copied_during_gc(allocated_bytes); |
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6021 if (ap == GCAllocForSurvived) { |
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6022 young_list()->add_survivor_region(alloc_region); |
| 4072 | 6023 } else { |
| 6024 _old_set.add(alloc_region); | |
|
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6025 } |
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6026 _hr_printer.retire(alloc_region); |
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6027 } |
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6028 |
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6029 HeapRegion* SurvivorGCAllocRegion::allocate_new_region(size_t word_size, |
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6030 bool force) { |
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6031 assert(!force, "not supported for GC alloc regions"); |
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6032 return _g1h->new_gc_alloc_region(word_size, count(), GCAllocForSurvived); |
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6033 } |
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6034 |
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6035 void SurvivorGCAllocRegion::retire_region(HeapRegion* alloc_region, |
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6036 size_t allocated_bytes) { |
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6037 _g1h->retire_gc_alloc_region(alloc_region, allocated_bytes, |
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6038 GCAllocForSurvived); |
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6039 } |
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6040 |
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6041 HeapRegion* OldGCAllocRegion::allocate_new_region(size_t word_size, |
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6042 bool force) { |
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6043 assert(!force, "not supported for GC alloc regions"); |
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6044 return _g1h->new_gc_alloc_region(word_size, count(), GCAllocForTenured); |
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6045 } |
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6046 |
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6047 void OldGCAllocRegion::retire_region(HeapRegion* alloc_region, |
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6048 size_t allocated_bytes) { |
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6049 _g1h->retire_gc_alloc_region(alloc_region, allocated_bytes, |
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6050 GCAllocForTenured); |
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6051 } |
|
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6052 // Heap region set verification |
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6053 |
| 2152 | 6054 class VerifyRegionListsClosure : public HeapRegionClosure { |
| 6055 private: | |
| 4072 | 6056 FreeRegionList* _free_list; |
| 6057 OldRegionSet* _old_set; | |
| 2152 | 6058 HumongousRegionSet* _humongous_set; |
| 6059 size_t _region_count; | |
| 6060 | |
| 6061 public: | |
| 4072 | 6062 VerifyRegionListsClosure(OldRegionSet* old_set, |
| 6063 HumongousRegionSet* humongous_set, | |
| 2152 | 6064 FreeRegionList* free_list) : |
| 4072 | 6065 _old_set(old_set), _humongous_set(humongous_set), |
| 6066 _free_list(free_list), _region_count(0) { } | |
| 2152 | 6067 |
| 6068 size_t region_count() { return _region_count; } | |
| 6069 | |
| 6070 bool doHeapRegion(HeapRegion* hr) { | |
| 6071 _region_count += 1; | |
| 6072 | |
| 6073 if (hr->continuesHumongous()) { | |
| 6074 return false; | |
| 6075 } | |
| 6076 | |
| 6077 if (hr->is_young()) { | |
| 6078 // TODO | |
| 6079 } else if (hr->startsHumongous()) { | |
| 6080 _humongous_set->verify_next_region(hr); | |
| 6081 } else if (hr->is_empty()) { | |
| 6082 _free_list->verify_next_region(hr); | |
| 4072 | 6083 } else { |
| 6084 _old_set->verify_next_region(hr); | |
| 2152 | 6085 } |
| 6086 return false; | |
| 6087 } | |
| 6088 }; | |
| 6089 | |
| 3766 | 6090 HeapRegion* G1CollectedHeap::new_heap_region(size_t hrs_index, |
| 6091 HeapWord* bottom) { | |
| 6092 HeapWord* end = bottom + HeapRegion::GrainWords; | |
| 6093 MemRegion mr(bottom, end); | |
| 6094 assert(_g1_reserved.contains(mr), "invariant"); | |
| 6095 // This might return NULL if the allocation fails | |
| 6096 return new HeapRegion(hrs_index, _bot_shared, mr, true /* is_zeroed */); | |
| 6097 } | |
| 6098 | |
| 2152 | 6099 void G1CollectedHeap::verify_region_sets() { |
| 6100 assert_heap_locked_or_at_safepoint(true /* should_be_vm_thread */); | |
| 6101 | |
| 6102 // First, check the explicit lists. | |
| 6103 _free_list.verify(); | |
| 6104 { | |
| 6105 // Given that a concurrent operation might be adding regions to | |
| 6106 // the secondary free list we have to take the lock before | |
| 6107 // verifying it. | |
| 6108 MutexLockerEx x(SecondaryFreeList_lock, Mutex::_no_safepoint_check_flag); | |
| 6109 _secondary_free_list.verify(); | |
| 6110 } | |
| 4072 | 6111 _old_set.verify(); |
| 2152 | 6112 _humongous_set.verify(); |
| 6113 | |
| 6114 // If a concurrent region freeing operation is in progress it will | |
| 6115 // be difficult to correctly attributed any free regions we come | |
| 6116 // across to the correct free list given that they might belong to | |
| 6117 // one of several (free_list, secondary_free_list, any local lists, | |
| 6118 // etc.). So, if that's the case we will skip the rest of the | |
| 6119 // verification operation. Alternatively, waiting for the concurrent | |
| 6120 // operation to complete will have a non-trivial effect on the GC's | |
| 6121 // operation (no concurrent operation will last longer than the | |
| 6122 // interval between two calls to verification) and it might hide | |
| 6123 // any issues that we would like to catch during testing. | |
| 6124 if (free_regions_coming()) { | |
| 6125 return; | |
| 6126 } | |
| 6127 | |
| 2361 | 6128 // Make sure we append the secondary_free_list on the free_list so |
| 6129 // that all free regions we will come across can be safely | |
| 6130 // attributed to the free_list. | |
| 6131 append_secondary_free_list_if_not_empty_with_lock(); | |
| 2152 | 6132 |
| 6133 // Finally, make sure that the region accounting in the lists is | |
| 6134 // consistent with what we see in the heap. | |
| 4072 | 6135 _old_set.verify_start(); |
| 2152 | 6136 _humongous_set.verify_start(); |
| 6137 _free_list.verify_start(); | |
| 6138 | |
| 4072 | 6139 VerifyRegionListsClosure cl(&_old_set, &_humongous_set, &_free_list); |
| 2152 | 6140 heap_region_iterate(&cl); |
| 6141 | |
| 4072 | 6142 _old_set.verify_end(); |
| 2152 | 6143 _humongous_set.verify_end(); |
| 6144 _free_list.verify_end(); | |
| 342 | 6145 } |