Mercurial > hg > truffle
annotate src/share/vm/gc_implementation/g1/g1CollectedHeap.cpp @ 6188:7994a5a35fcf
6921087: G1: remove per-GC-thread expansion tables from the fine-grain remembered sets
Summary: Remove the per-thread expansion tables (PosParPRT) and associated expansion and compaction from the fine grain RSet entries. This code has been unused for a while.
Reviewed-by: johnc, brutisso
Contributed-by: Thomas Schatzl <thomas.schatzl@jku.at>
| author | johnc |
|---|---|
| date | Mon, 25 Jun 2012 16:00:55 -0700 |
| parents | b9442ac22f59 |
| children | 24b9c7f4cae6 922993931b3d |
| rev | line source |
|---|---|
| 342 | 1 /* |
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2 * Copyright (c) 2001, 2012, Oracle and/or its affiliates. All rights reserved. |
| 342 | 3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
| 4 * | |
| 5 * This code is free software; you can redistribute it and/or modify it | |
| 6 * under the terms of the GNU General Public License version 2 only, as | |
| 7 * published by the Free Software Foundation. | |
| 8 * | |
| 9 * This code is distributed in the hope that it will be useful, but WITHOUT | |
| 10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or | |
| 11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License | |
| 12 * version 2 for more details (a copy is included in the LICENSE file that | |
| 13 * accompanied this code). | |
| 14 * | |
| 15 * You should have received a copy of the GNU General Public License version | |
| 16 * 2 along with this work; if not, write to the Free Software Foundation, | |
| 17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. | |
| 18 * | |
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19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
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20 * or visit www.oracle.com if you need additional information or have any |
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21 * questions. |
| 342 | 22 * |
| 23 */ | |
| 24 | |
| 1972 | 25 #include "precompiled.hpp" |
| 26 #include "code/icBuffer.hpp" | |
| 27 #include "gc_implementation/g1/bufferingOopClosure.hpp" | |
| 28 #include "gc_implementation/g1/concurrentG1Refine.hpp" | |
| 29 #include "gc_implementation/g1/concurrentG1RefineThread.hpp" | |
| 30 #include "gc_implementation/g1/concurrentMarkThread.inline.hpp" | |
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31 #include "gc_implementation/g1/g1AllocRegion.inline.hpp" |
| 1972 | 32 #include "gc_implementation/g1/g1CollectedHeap.inline.hpp" |
| 33 #include "gc_implementation/g1/g1CollectorPolicy.hpp" | |
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34 #include "gc_implementation/g1/g1ErgoVerbose.hpp" |
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35 #include "gc_implementation/g1/g1EvacFailure.hpp" |
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36 #include "gc_implementation/g1/g1Log.hpp" |
| 1972 | 37 #include "gc_implementation/g1/g1MarkSweep.hpp" |
| 38 #include "gc_implementation/g1/g1OopClosures.inline.hpp" | |
| 39 #include "gc_implementation/g1/g1RemSet.inline.hpp" | |
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40 #include "gc_implementation/g1/heapRegion.inline.hpp" |
| 1972 | 41 #include "gc_implementation/g1/heapRegionRemSet.hpp" |
| 42 #include "gc_implementation/g1/heapRegionSeq.inline.hpp" | |
| 43 #include "gc_implementation/g1/vm_operations_g1.hpp" | |
| 44 #include "gc_implementation/shared/isGCActiveMark.hpp" | |
| 45 #include "memory/gcLocker.inline.hpp" | |
| 46 #include "memory/genOopClosures.inline.hpp" | |
| 47 #include "memory/generationSpec.hpp" | |
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48 #include "memory/referenceProcessor.hpp" |
| 1972 | 49 #include "oops/oop.inline.hpp" |
| 50 #include "oops/oop.pcgc.inline.hpp" | |
| 51 #include "runtime/aprofiler.hpp" | |
| 52 #include "runtime/vmThread.hpp" | |
| 342 | 53 |
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54 size_t G1CollectedHeap::_humongous_object_threshold_in_words = 0; |
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55 |
| 342 | 56 // turn it on so that the contents of the young list (scan-only / |
| 57 // to-be-collected) are printed at "strategic" points before / during | |
| 58 // / after the collection --- this is useful for debugging | |
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59 #define YOUNG_LIST_VERBOSE 0 |
| 342 | 60 // CURRENT STATUS |
| 61 // This file is under construction. Search for "FIXME". | |
| 62 | |
| 63 // INVARIANTS/NOTES | |
| 64 // | |
| 65 // All allocation activity covered by the G1CollectedHeap interface is | |
| 1973 | 66 // serialized by acquiring the HeapLock. This happens in mem_allocate |
| 67 // and allocate_new_tlab, which are the "entry" points to the | |
| 68 // allocation code from the rest of the JVM. (Note that this does not | |
| 69 // apply to TLAB allocation, which is not part of this interface: it | |
| 70 // is done by clients of this interface.) | |
| 342 | 71 |
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72 // Notes on implementation of parallelism in different tasks. |
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73 // |
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74 // G1ParVerifyTask uses heap_region_par_iterate_chunked() for parallelism. |
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75 // The number of GC workers is passed to heap_region_par_iterate_chunked(). |
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76 // It does use run_task() which sets _n_workers in the task. |
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77 // G1ParTask executes g1_process_strong_roots() -> |
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78 // SharedHeap::process_strong_roots() which calls eventuall to |
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79 // CardTableModRefBS::par_non_clean_card_iterate_work() which uses |
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80 // SequentialSubTasksDone. SharedHeap::process_strong_roots() also |
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81 // directly uses SubTasksDone (_process_strong_tasks field in SharedHeap). |
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82 // |
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83 |
| 342 | 84 // Local to this file. |
| 85 | |
| 86 class RefineCardTableEntryClosure: public CardTableEntryClosure { | |
| 87 SuspendibleThreadSet* _sts; | |
| 88 G1RemSet* _g1rs; | |
| 89 ConcurrentG1Refine* _cg1r; | |
| 90 bool _concurrent; | |
| 91 public: | |
| 92 RefineCardTableEntryClosure(SuspendibleThreadSet* sts, | |
| 93 G1RemSet* g1rs, | |
| 94 ConcurrentG1Refine* cg1r) : | |
| 95 _sts(sts), _g1rs(g1rs), _cg1r(cg1r), _concurrent(true) | |
| 96 {} | |
| 97 bool do_card_ptr(jbyte* card_ptr, int worker_i) { | |
| 1705 | 98 bool oops_into_cset = _g1rs->concurrentRefineOneCard(card_ptr, worker_i, false); |
| 99 // This path is executed by the concurrent refine or mutator threads, | |
| 100 // concurrently, and so we do not care if card_ptr contains references | |
| 101 // that point into the collection set. | |
| 102 assert(!oops_into_cset, "should be"); | |
| 103 | |
| 342 | 104 if (_concurrent && _sts->should_yield()) { |
| 105 // Caller will actually yield. | |
| 106 return false; | |
| 107 } | |
| 108 // Otherwise, we finished successfully; return true. | |
| 109 return true; | |
| 110 } | |
| 111 void set_concurrent(bool b) { _concurrent = b; } | |
| 112 }; | |
| 113 | |
| 114 | |
| 115 class ClearLoggedCardTableEntryClosure: public CardTableEntryClosure { | |
| 116 int _calls; | |
| 117 G1CollectedHeap* _g1h; | |
| 118 CardTableModRefBS* _ctbs; | |
| 119 int _histo[256]; | |
| 120 public: | |
| 121 ClearLoggedCardTableEntryClosure() : | |
| 122 _calls(0) | |
| 123 { | |
| 124 _g1h = G1CollectedHeap::heap(); | |
| 125 _ctbs = (CardTableModRefBS*)_g1h->barrier_set(); | |
| 126 for (int i = 0; i < 256; i++) _histo[i] = 0; | |
| 127 } | |
| 128 bool do_card_ptr(jbyte* card_ptr, int worker_i) { | |
| 129 if (_g1h->is_in_reserved(_ctbs->addr_for(card_ptr))) { | |
| 130 _calls++; | |
| 131 unsigned char* ujb = (unsigned char*)card_ptr; | |
| 132 int ind = (int)(*ujb); | |
| 133 _histo[ind]++; | |
| 134 *card_ptr = -1; | |
| 135 } | |
| 136 return true; | |
| 137 } | |
| 138 int calls() { return _calls; } | |
| 139 void print_histo() { | |
| 140 gclog_or_tty->print_cr("Card table value histogram:"); | |
| 141 for (int i = 0; i < 256; i++) { | |
| 142 if (_histo[i] != 0) { | |
| 143 gclog_or_tty->print_cr(" %d: %d", i, _histo[i]); | |
| 144 } | |
| 145 } | |
| 146 } | |
| 147 }; | |
| 148 | |
| 149 class RedirtyLoggedCardTableEntryClosure: public CardTableEntryClosure { | |
| 150 int _calls; | |
| 151 G1CollectedHeap* _g1h; | |
| 152 CardTableModRefBS* _ctbs; | |
| 153 public: | |
| 154 RedirtyLoggedCardTableEntryClosure() : | |
| 155 _calls(0) | |
| 156 { | |
| 157 _g1h = G1CollectedHeap::heap(); | |
| 158 _ctbs = (CardTableModRefBS*)_g1h->barrier_set(); | |
| 159 } | |
| 160 bool do_card_ptr(jbyte* card_ptr, int worker_i) { | |
| 161 if (_g1h->is_in_reserved(_ctbs->addr_for(card_ptr))) { | |
| 162 _calls++; | |
| 163 *card_ptr = 0; | |
| 164 } | |
| 165 return true; | |
| 166 } | |
| 167 int calls() { return _calls; } | |
| 168 }; | |
| 169 | |
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170 class RedirtyLoggedCardTableEntryFastClosure : public CardTableEntryClosure { |
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171 public: |
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172 bool do_card_ptr(jbyte* card_ptr, int worker_i) { |
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173 *card_ptr = CardTableModRefBS::dirty_card_val(); |
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174 return true; |
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175 } |
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176 }; |
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177 |
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178 YoungList::YoungList(G1CollectedHeap* g1h) : |
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179 _g1h(g1h), _head(NULL), _length(0), _last_sampled_rs_lengths(0), |
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180 _survivor_head(NULL), _survivor_tail(NULL), _survivor_length(0) { |
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181 guarantee(check_list_empty(false), "just making sure..."); |
| 342 | 182 } |
| 183 | |
| 184 void YoungList::push_region(HeapRegion *hr) { | |
| 185 assert(!hr->is_young(), "should not already be young"); | |
| 186 assert(hr->get_next_young_region() == NULL, "cause it should!"); | |
| 187 | |
| 188 hr->set_next_young_region(_head); | |
| 189 _head = hr; | |
| 190 | |
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191 _g1h->g1_policy()->set_region_eden(hr, (int) _length); |
| 342 | 192 ++_length; |
| 193 } | |
| 194 | |
| 195 void YoungList::add_survivor_region(HeapRegion* hr) { | |
| 545 | 196 assert(hr->is_survivor(), "should be flagged as survivor region"); |
| 342 | 197 assert(hr->get_next_young_region() == NULL, "cause it should!"); |
| 198 | |
| 199 hr->set_next_young_region(_survivor_head); | |
| 200 if (_survivor_head == NULL) { | |
| 545 | 201 _survivor_tail = hr; |
| 342 | 202 } |
| 203 _survivor_head = hr; | |
| 204 ++_survivor_length; | |
| 205 } | |
| 206 | |
| 207 void YoungList::empty_list(HeapRegion* list) { | |
| 208 while (list != NULL) { | |
| 209 HeapRegion* next = list->get_next_young_region(); | |
| 210 list->set_next_young_region(NULL); | |
| 211 list->uninstall_surv_rate_group(); | |
| 212 list->set_not_young(); | |
| 213 list = next; | |
| 214 } | |
| 215 } | |
| 216 | |
| 217 void YoungList::empty_list() { | |
| 218 assert(check_list_well_formed(), "young list should be well formed"); | |
| 219 | |
| 220 empty_list(_head); | |
| 221 _head = NULL; | |
| 222 _length = 0; | |
| 223 | |
| 224 empty_list(_survivor_head); | |
| 225 _survivor_head = NULL; | |
| 545 | 226 _survivor_tail = NULL; |
| 342 | 227 _survivor_length = 0; |
| 228 | |
| 229 _last_sampled_rs_lengths = 0; | |
| 230 | |
| 231 assert(check_list_empty(false), "just making sure..."); | |
| 232 } | |
| 233 | |
| 234 bool YoungList::check_list_well_formed() { | |
| 235 bool ret = true; | |
| 236 | |
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237 uint length = 0; |
| 342 | 238 HeapRegion* curr = _head; |
| 239 HeapRegion* last = NULL; | |
| 240 while (curr != NULL) { | |
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241 if (!curr->is_young()) { |
| 342 | 242 gclog_or_tty->print_cr("### YOUNG REGION "PTR_FORMAT"-"PTR_FORMAT" " |
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243 "incorrectly tagged (y: %d, surv: %d)", |
| 342 | 244 curr->bottom(), curr->end(), |
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245 curr->is_young(), curr->is_survivor()); |
| 342 | 246 ret = false; |
| 247 } | |
| 248 ++length; | |
| 249 last = curr; | |
| 250 curr = curr->get_next_young_region(); | |
| 251 } | |
| 252 ret = ret && (length == _length); | |
| 253 | |
| 254 if (!ret) { | |
| 255 gclog_or_tty->print_cr("### YOUNG LIST seems not well formed!"); | |
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256 gclog_or_tty->print_cr("### list has %u entries, _length is %u", |
| 342 | 257 length, _length); |
| 258 } | |
| 259 | |
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260 return ret; |
| 342 | 261 } |
| 262 | |
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263 bool YoungList::check_list_empty(bool check_sample) { |
| 342 | 264 bool ret = true; |
| 265 | |
| 266 if (_length != 0) { | |
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267 gclog_or_tty->print_cr("### YOUNG LIST should have 0 length, not %u", |
| 342 | 268 _length); |
| 269 ret = false; | |
| 270 } | |
| 271 if (check_sample && _last_sampled_rs_lengths != 0) { | |
| 272 gclog_or_tty->print_cr("### YOUNG LIST has non-zero last sampled RS lengths"); | |
| 273 ret = false; | |
| 274 } | |
| 275 if (_head != NULL) { | |
| 276 gclog_or_tty->print_cr("### YOUNG LIST does not have a NULL head"); | |
| 277 ret = false; | |
| 278 } | |
| 279 if (!ret) { | |
| 280 gclog_or_tty->print_cr("### YOUNG LIST does not seem empty"); | |
| 281 } | |
| 282 | |
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283 return ret; |
| 342 | 284 } |
| 285 | |
| 286 void | |
| 287 YoungList::rs_length_sampling_init() { | |
| 288 _sampled_rs_lengths = 0; | |
| 289 _curr = _head; | |
| 290 } | |
| 291 | |
| 292 bool | |
| 293 YoungList::rs_length_sampling_more() { | |
| 294 return _curr != NULL; | |
| 295 } | |
| 296 | |
| 297 void | |
| 298 YoungList::rs_length_sampling_next() { | |
| 299 assert( _curr != NULL, "invariant" ); | |
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300 size_t rs_length = _curr->rem_set()->occupied(); |
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301 |
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302 _sampled_rs_lengths += rs_length; |
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303 |
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304 // The current region may not yet have been added to the |
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305 // incremental collection set (it gets added when it is |
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306 // retired as the current allocation region). |
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307 if (_curr->in_collection_set()) { |
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308 // Update the collection set policy information for this region |
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309 _g1h->g1_policy()->update_incremental_cset_info(_curr, rs_length); |
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310 } |
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311 |
| 342 | 312 _curr = _curr->get_next_young_region(); |
| 313 if (_curr == NULL) { | |
| 314 _last_sampled_rs_lengths = _sampled_rs_lengths; | |
| 315 // gclog_or_tty->print_cr("last sampled RS lengths = %d", _last_sampled_rs_lengths); | |
| 316 } | |
| 317 } | |
| 318 | |
| 319 void | |
| 320 YoungList::reset_auxilary_lists() { | |
| 321 guarantee( is_empty(), "young list should be empty" ); | |
| 322 assert(check_list_well_formed(), "young list should be well formed"); | |
| 323 | |
| 324 // Add survivor regions to SurvRateGroup. | |
| 325 _g1h->g1_policy()->note_start_adding_survivor_regions(); | |
| 545 | 326 _g1h->g1_policy()->finished_recalculating_age_indexes(true /* is_survivors */); |
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327 |
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328 int young_index_in_cset = 0; |
| 342 | 329 for (HeapRegion* curr = _survivor_head; |
| 330 curr != NULL; | |
| 331 curr = curr->get_next_young_region()) { | |
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332 _g1h->g1_policy()->set_region_survivor(curr, young_index_in_cset); |
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333 |
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334 // The region is a non-empty survivor so let's add it to |
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335 // the incremental collection set for the next evacuation |
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336 // pause. |
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337 _g1h->g1_policy()->add_region_to_incremental_cset_rhs(curr); |
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338 young_index_in_cset += 1; |
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339 } |
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340 assert((uint) young_index_in_cset == _survivor_length, "post-condition"); |
| 342 | 341 _g1h->g1_policy()->note_stop_adding_survivor_regions(); |
| 342 | |
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343 _head = _survivor_head; |
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344 _length = _survivor_length; |
| 342 | 345 if (_survivor_head != NULL) { |
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346 assert(_survivor_tail != NULL, "cause it shouldn't be"); |
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347 assert(_survivor_length > 0, "invariant"); |
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348 _survivor_tail->set_next_young_region(NULL); |
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349 } |
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350 |
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351 // Don't clear the survivor list handles until the start of |
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352 // the next evacuation pause - we need it in order to re-tag |
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353 // the survivor regions from this evacuation pause as 'young' |
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354 // at the start of the next. |
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355 |
| 545 | 356 _g1h->g1_policy()->finished_recalculating_age_indexes(false /* is_survivors */); |
| 342 | 357 |
| 358 assert(check_list_well_formed(), "young list should be well formed"); | |
| 359 } | |
| 360 | |
| 361 void YoungList::print() { | |
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362 HeapRegion* lists[] = {_head, _survivor_head}; |
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363 const char* names[] = {"YOUNG", "SURVIVOR"}; |
| 342 | 364 |
| 365 for (unsigned int list = 0; list < ARRAY_SIZE(lists); ++list) { | |
| 366 gclog_or_tty->print_cr("%s LIST CONTENTS", names[list]); | |
| 367 HeapRegion *curr = lists[list]; | |
| 368 if (curr == NULL) | |
| 369 gclog_or_tty->print_cr(" empty"); | |
| 370 while (curr != NULL) { | |
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371 gclog_or_tty->print_cr(" "HR_FORMAT", P: "PTR_FORMAT "N: "PTR_FORMAT", age: %4d", |
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372 HR_FORMAT_PARAMS(curr), |
| 342 | 373 curr->prev_top_at_mark_start(), |
| 374 curr->next_top_at_mark_start(), | |
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375 curr->age_in_surv_rate_group_cond()); |
| 342 | 376 curr = curr->get_next_young_region(); |
| 377 } | |
| 378 } | |
| 379 | |
| 380 gclog_or_tty->print_cr(""); | |
| 381 } | |
| 382 | |
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383 void G1CollectedHeap::push_dirty_cards_region(HeapRegion* hr) |
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384 { |
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385 // Claim the right to put the region on the dirty cards region list |
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386 // by installing a self pointer. |
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387 HeapRegion* next = hr->get_next_dirty_cards_region(); |
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388 if (next == NULL) { |
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389 HeapRegion* res = (HeapRegion*) |
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390 Atomic::cmpxchg_ptr(hr, hr->next_dirty_cards_region_addr(), |
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391 NULL); |
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392 if (res == NULL) { |
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393 HeapRegion* head; |
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394 do { |
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395 // Put the region to the dirty cards region list. |
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396 head = _dirty_cards_region_list; |
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397 next = (HeapRegion*) |
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398 Atomic::cmpxchg_ptr(hr, &_dirty_cards_region_list, head); |
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399 if (next == head) { |
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400 assert(hr->get_next_dirty_cards_region() == hr, |
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401 "hr->get_next_dirty_cards_region() != hr"); |
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402 if (next == NULL) { |
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403 // The last region in the list points to itself. |
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404 hr->set_next_dirty_cards_region(hr); |
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405 } else { |
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406 hr->set_next_dirty_cards_region(next); |
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407 } |
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408 } |
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409 } while (next != head); |
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410 } |
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411 } |
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412 } |
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413 |
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414 HeapRegion* G1CollectedHeap::pop_dirty_cards_region() |
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415 { |
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416 HeapRegion* head; |
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417 HeapRegion* hr; |
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418 do { |
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419 head = _dirty_cards_region_list; |
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420 if (head == NULL) { |
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421 return NULL; |
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422 } |
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423 HeapRegion* new_head = head->get_next_dirty_cards_region(); |
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424 if (head == new_head) { |
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425 // The last region. |
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426 new_head = NULL; |
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427 } |
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428 hr = (HeapRegion*)Atomic::cmpxchg_ptr(new_head, &_dirty_cards_region_list, |
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429 head); |
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430 } while (hr != head); |
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431 assert(hr != NULL, "invariant"); |
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432 hr->set_next_dirty_cards_region(NULL); |
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433 return hr; |
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434 } |
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435 |
| 342 | 436 void G1CollectedHeap::stop_conc_gc_threads() { |
| 794 | 437 _cg1r->stop(); |
| 342 | 438 _cmThread->stop(); |
| 439 } | |
| 440 | |
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441 #ifdef ASSERT |
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442 // A region is added to the collection set as it is retired |
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443 // so an address p can point to a region which will be in the |
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444 // collection set but has not yet been retired. This method |
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445 // therefore is only accurate during a GC pause after all |
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446 // regions have been retired. It is used for debugging |
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447 // to check if an nmethod has references to objects that can |
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448 // be move during a partial collection. Though it can be |
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449 // inaccurate, it is sufficient for G1 because the conservative |
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450 // implementation of is_scavengable() for G1 will indicate that |
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451 // all nmethods must be scanned during a partial collection. |
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452 bool G1CollectedHeap::is_in_partial_collection(const void* p) { |
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453 HeapRegion* hr = heap_region_containing(p); |
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454 return hr != NULL && hr->in_collection_set(); |
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455 } |
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456 #endif |
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457 |
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458 // Returns true if the reference points to an object that |
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459 // can move in an incremental collecction. |
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460 bool G1CollectedHeap::is_scavengable(const void* p) { |
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461 G1CollectedHeap* g1h = G1CollectedHeap::heap(); |
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462 G1CollectorPolicy* g1p = g1h->g1_policy(); |
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463 HeapRegion* hr = heap_region_containing(p); |
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464 if (hr == NULL) { |
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465 // perm gen (or null) |
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466 return false; |
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467 } else { |
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468 return !hr->isHumongous(); |
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469 } |
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470 } |
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471 |
| 342 | 472 void G1CollectedHeap::check_ct_logs_at_safepoint() { |
| 473 DirtyCardQueueSet& dcqs = JavaThread::dirty_card_queue_set(); | |
| 474 CardTableModRefBS* ct_bs = (CardTableModRefBS*)barrier_set(); | |
| 475 | |
| 476 // Count the dirty cards at the start. | |
| 477 CountNonCleanMemRegionClosure count1(this); | |
| 478 ct_bs->mod_card_iterate(&count1); | |
| 479 int orig_count = count1.n(); | |
| 480 | |
| 481 // First clear the logged cards. | |
| 482 ClearLoggedCardTableEntryClosure clear; | |
| 483 dcqs.set_closure(&clear); | |
| 484 dcqs.apply_closure_to_all_completed_buffers(); | |
| 485 dcqs.iterate_closure_all_threads(false); | |
| 486 clear.print_histo(); | |
| 487 | |
| 488 // Now ensure that there's no dirty cards. | |
| 489 CountNonCleanMemRegionClosure count2(this); | |
| 490 ct_bs->mod_card_iterate(&count2); | |
| 491 if (count2.n() != 0) { | |
| 492 gclog_or_tty->print_cr("Card table has %d entries; %d originally", | |
| 493 count2.n(), orig_count); | |
| 494 } | |
| 495 guarantee(count2.n() == 0, "Card table should be clean."); | |
| 496 | |
| 497 RedirtyLoggedCardTableEntryClosure redirty; | |
| 498 JavaThread::dirty_card_queue_set().set_closure(&redirty); | |
| 499 dcqs.apply_closure_to_all_completed_buffers(); | |
| 500 dcqs.iterate_closure_all_threads(false); | |
| 501 gclog_or_tty->print_cr("Log entries = %d, dirty cards = %d.", | |
| 502 clear.calls(), orig_count); | |
| 503 guarantee(redirty.calls() == clear.calls(), | |
| 504 "Or else mechanism is broken."); | |
| 505 | |
| 506 CountNonCleanMemRegionClosure count3(this); | |
| 507 ct_bs->mod_card_iterate(&count3); | |
| 508 if (count3.n() != orig_count) { | |
| 509 gclog_or_tty->print_cr("Should have restored them all: orig = %d, final = %d.", | |
| 510 orig_count, count3.n()); | |
| 511 guarantee(count3.n() >= orig_count, "Should have restored them all."); | |
| 512 } | |
| 513 | |
| 514 JavaThread::dirty_card_queue_set().set_closure(_refine_cte_cl); | |
| 515 } | |
| 516 | |
| 517 // Private class members. | |
| 518 | |
| 519 G1CollectedHeap* G1CollectedHeap::_g1h; | |
| 520 | |
| 521 // Private methods. | |
| 522 | |
| 2152 | 523 HeapRegion* |
| 2361 | 524 G1CollectedHeap::new_region_try_secondary_free_list() { |
| 2152 | 525 MutexLockerEx x(SecondaryFreeList_lock, Mutex::_no_safepoint_check_flag); |
| 526 while (!_secondary_free_list.is_empty() || free_regions_coming()) { | |
| 527 if (!_secondary_free_list.is_empty()) { | |
| 528 if (G1ConcRegionFreeingVerbose) { | |
| 529 gclog_or_tty->print_cr("G1ConcRegionFreeing [region alloc] : " | |
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530 "secondary_free_list has %u entries", |
| 2152 | 531 _secondary_free_list.length()); |
| 532 } | |
| 533 // It looks as if there are free regions available on the | |
| 534 // secondary_free_list. Let's move them to the free_list and try | |
| 535 // again to allocate from it. | |
| 536 append_secondary_free_list(); | |
| 537 | |
| 538 assert(!_free_list.is_empty(), "if the secondary_free_list was not " | |
| 539 "empty we should have moved at least one entry to the free_list"); | |
| 540 HeapRegion* res = _free_list.remove_head(); | |
| 541 if (G1ConcRegionFreeingVerbose) { | |
| 542 gclog_or_tty->print_cr("G1ConcRegionFreeing [region alloc] : " | |
| 543 "allocated "HR_FORMAT" from secondary_free_list", | |
| 544 HR_FORMAT_PARAMS(res)); | |
| 545 } | |
| 546 return res; | |
| 547 } | |
| 548 | |
| 549 // Wait here until we get notifed either when (a) there are no | |
| 550 // more free regions coming or (b) some regions have been moved on | |
| 551 // the secondary_free_list. | |
| 552 SecondaryFreeList_lock->wait(Mutex::_no_safepoint_check_flag); | |
| 553 } | |
| 554 | |
| 555 if (G1ConcRegionFreeingVerbose) { | |
| 556 gclog_or_tty->print_cr("G1ConcRegionFreeing [region alloc] : " | |
| 557 "could not allocate from secondary_free_list"); | |
| 558 } | |
| 559 return NULL; | |
| 560 } | |
| 561 | |
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562 HeapRegion* G1CollectedHeap::new_region(size_t word_size, bool do_expand) { |
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563 assert(!isHumongous(word_size) || word_size <= HeapRegion::GrainWords, |
| 2152 | 564 "the only time we use this to allocate a humongous region is " |
| 565 "when we are allocating a single humongous region"); | |
| 566 | |
| 567 HeapRegion* res; | |
| 568 if (G1StressConcRegionFreeing) { | |
| 569 if (!_secondary_free_list.is_empty()) { | |
| 570 if (G1ConcRegionFreeingVerbose) { | |
| 571 gclog_or_tty->print_cr("G1ConcRegionFreeing [region alloc] : " | |
| 572 "forced to look at the secondary_free_list"); | |
| 573 } | |
| 2361 | 574 res = new_region_try_secondary_free_list(); |
| 2152 | 575 if (res != NULL) { |
| 576 return res; | |
| 577 } | |
| 578 } | |
| 579 } | |
| 580 res = _free_list.remove_head_or_null(); | |
| 581 if (res == NULL) { | |
| 582 if (G1ConcRegionFreeingVerbose) { | |
| 583 gclog_or_tty->print_cr("G1ConcRegionFreeing [region alloc] : " | |
| 584 "res == NULL, trying the secondary_free_list"); | |
| 585 } | |
| 2361 | 586 res = new_region_try_secondary_free_list(); |
| 2152 | 587 } |
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588 if (res == NULL && do_expand && _expand_heap_after_alloc_failure) { |
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589 // Currently, only attempts to allocate GC alloc regions set |
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590 // do_expand to true. So, we should only reach here during a |
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591 // safepoint. If this assumption changes we might have to |
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592 // reconsider the use of _expand_heap_after_alloc_failure. |
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593 assert(SafepointSynchronize::is_at_safepoint(), "invariant"); |
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594 |
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595 ergo_verbose1(ErgoHeapSizing, |
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596 "attempt heap expansion", |
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597 ergo_format_reason("region allocation request failed") |
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598 ergo_format_byte("allocation request"), |
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599 word_size * HeapWordSize); |
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600 if (expand(word_size * HeapWordSize)) { |
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601 // Given that expand() succeeded in expanding the heap, and we |
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602 // always expand the heap by an amount aligned to the heap |
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603 // region size, the free list should in theory not be empty. So |
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604 // it would probably be OK to use remove_head(). But the extra |
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605 // check for NULL is unlikely to be a performance issue here (we |
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606 // just expanded the heap!) so let's just be conservative and |
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607 // use remove_head_or_null(). |
| 3766 | 608 res = _free_list.remove_head_or_null(); |
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609 } else { |
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610 _expand_heap_after_alloc_failure = false; |
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611 } |
| 342 | 612 } |
| 613 return res; | |
| 614 } | |
| 615 | |
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616 uint G1CollectedHeap::humongous_obj_allocate_find_first(uint num_regions, |
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617 size_t word_size) { |
| 2361 | 618 assert(isHumongous(word_size), "word_size should be humongous"); |
| 619 assert(num_regions * HeapRegion::GrainWords >= word_size, "pre-condition"); | |
| 620 | |
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621 uint first = G1_NULL_HRS_INDEX; |
| 2152 | 622 if (num_regions == 1) { |
| 623 // Only one region to allocate, no need to go through the slower | |
| 624 // path. The caller will attempt the expasion if this fails, so | |
| 625 // let's not try to expand here too. | |
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626 HeapRegion* hr = new_region(word_size, false /* do_expand */); |
| 2152 | 627 if (hr != NULL) { |
| 628 first = hr->hrs_index(); | |
| 629 } else { | |
| 3766 | 630 first = G1_NULL_HRS_INDEX; |
| 2152 | 631 } |
| 632 } else { | |
| 633 // We can't allocate humongous regions while cleanupComplete() is | |
| 634 // running, since some of the regions we find to be empty might not | |
| 635 // yet be added to the free list and it is not straightforward to | |
| 636 // know which list they are on so that we can remove them. Note | |
| 637 // that we only need to do this if we need to allocate more than | |
| 638 // one region to satisfy the current humongous allocation | |
| 639 // request. If we are only allocating one region we use the common | |
| 640 // region allocation code (see above). | |
| 641 wait_while_free_regions_coming(); | |
| 2361 | 642 append_secondary_free_list_if_not_empty_with_lock(); |
| 2152 | 643 |
| 644 if (free_regions() >= num_regions) { | |
| 3766 | 645 first = _hrs.find_contiguous(num_regions); |
| 646 if (first != G1_NULL_HRS_INDEX) { | |
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647 for (uint i = first; i < first + num_regions; ++i) { |
| 3766 | 648 HeapRegion* hr = region_at(i); |
| 2152 | 649 assert(hr->is_empty(), "sanity"); |
| 2361 | 650 assert(is_on_master_free_list(hr), "sanity"); |
| 2152 | 651 hr->set_pending_removal(true); |
| 652 } | |
| 653 _free_list.remove_all_pending(num_regions); | |
| 654 } | |
| 655 } | |
| 656 } | |
| 657 return first; | |
| 658 } | |
| 659 | |
| 2361 | 660 HeapWord* |
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661 G1CollectedHeap::humongous_obj_allocate_initialize_regions(uint first, |
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662 uint num_regions, |
| 2361 | 663 size_t word_size) { |
| 3766 | 664 assert(first != G1_NULL_HRS_INDEX, "pre-condition"); |
| 2361 | 665 assert(isHumongous(word_size), "word_size should be humongous"); |
| 666 assert(num_regions * HeapRegion::GrainWords >= word_size, "pre-condition"); | |
| 667 | |
| 668 // Index of last region in the series + 1. | |
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669 uint last = first + num_regions; |
| 2361 | 670 |
| 671 // We need to initialize the region(s) we just discovered. This is | |
| 672 // a bit tricky given that it can happen concurrently with | |
| 673 // refinement threads refining cards on these regions and | |
| 674 // potentially wanting to refine the BOT as they are scanning | |
| 675 // those cards (this can happen shortly after a cleanup; see CR | |
| 676 // 6991377). So we have to set up the region(s) carefully and in | |
| 677 // a specific order. | |
| 678 | |
| 679 // The word size sum of all the regions we will allocate. | |
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680 size_t word_size_sum = (size_t) num_regions * HeapRegion::GrainWords; |
| 2361 | 681 assert(word_size <= word_size_sum, "sanity"); |
| 682 | |
| 683 // This will be the "starts humongous" region. | |
| 3766 | 684 HeapRegion* first_hr = region_at(first); |
| 2361 | 685 // The header of the new object will be placed at the bottom of |
| 686 // the first region. | |
| 687 HeapWord* new_obj = first_hr->bottom(); | |
| 688 // This will be the new end of the first region in the series that | |
| 689 // should also match the end of the last region in the seriers. | |
| 690 HeapWord* new_end = new_obj + word_size_sum; | |
| 691 // This will be the new top of the first region that will reflect | |
| 692 // this allocation. | |
| 693 HeapWord* new_top = new_obj + word_size; | |
| 694 | |
| 695 // First, we need to zero the header of the space that we will be | |
| 696 // allocating. When we update top further down, some refinement | |
| 697 // threads might try to scan the region. By zeroing the header we | |
| 698 // ensure that any thread that will try to scan the region will | |
| 699 // come across the zero klass word and bail out. | |
| 700 // | |
| 701 // NOTE: It would not have been correct to have used | |
| 702 // CollectedHeap::fill_with_object() and make the space look like | |
| 703 // an int array. The thread that is doing the allocation will | |
| 704 // later update the object header to a potentially different array | |
| 705 // type and, for a very short period of time, the klass and length | |
| 706 // fields will be inconsistent. This could cause a refinement | |
| 707 // thread to calculate the object size incorrectly. | |
| 708 Copy::fill_to_words(new_obj, oopDesc::header_size(), 0); | |
| 709 | |
| 710 // We will set up the first region as "starts humongous". This | |
| 711 // will also update the BOT covering all the regions to reflect | |
| 712 // that there is a single object that starts at the bottom of the | |
| 713 // first region. | |
| 714 first_hr->set_startsHumongous(new_top, new_end); | |
| 715 | |
| 716 // Then, if there are any, we will set up the "continues | |
| 717 // humongous" regions. | |
| 718 HeapRegion* hr = NULL; | |
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719 for (uint i = first + 1; i < last; ++i) { |
| 3766 | 720 hr = region_at(i); |
| 2361 | 721 hr->set_continuesHumongous(first_hr); |
| 722 } | |
| 723 // If we have "continues humongous" regions (hr != NULL), then the | |
| 724 // end of the last one should match new_end. | |
| 725 assert(hr == NULL || hr->end() == new_end, "sanity"); | |
| 726 | |
| 727 // Up to this point no concurrent thread would have been able to | |
| 728 // do any scanning on any region in this series. All the top | |
| 729 // fields still point to bottom, so the intersection between | |
| 730 // [bottom,top] and [card_start,card_end] will be empty. Before we | |
| 731 // update the top fields, we'll do a storestore to make sure that | |
| 732 // no thread sees the update to top before the zeroing of the | |
| 733 // object header and the BOT initialization. | |
| 734 OrderAccess::storestore(); | |
| 735 | |
| 736 // Now that the BOT and the object header have been initialized, | |
| 737 // we can update top of the "starts humongous" region. | |
| 738 assert(first_hr->bottom() < new_top && new_top <= first_hr->end(), | |
| 739 "new_top should be in this region"); | |
| 740 first_hr->set_top(new_top); | |
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741 if (_hr_printer.is_active()) { |
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742 HeapWord* bottom = first_hr->bottom(); |
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743 HeapWord* end = first_hr->orig_end(); |
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744 if ((first + 1) == last) { |
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745 // the series has a single humongous region |
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746 _hr_printer.alloc(G1HRPrinter::SingleHumongous, first_hr, new_top); |
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747 } else { |
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748 // the series has more than one humongous regions |
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749 _hr_printer.alloc(G1HRPrinter::StartsHumongous, first_hr, end); |
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750 } |
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751 } |
| 2361 | 752 |
| 753 // Now, we will update the top fields of the "continues humongous" | |
| 754 // regions. The reason we need to do this is that, otherwise, | |
| 755 // these regions would look empty and this will confuse parts of | |
| 756 // G1. For example, the code that looks for a consecutive number | |
| 757 // of empty regions will consider them empty and try to | |
| 758 // re-allocate them. We can extend is_empty() to also include | |
| 759 // !continuesHumongous(), but it is easier to just update the top | |
| 760 // fields here. The way we set top for all regions (i.e., top == | |
| 761 // end for all regions but the last one, top == new_top for the | |
| 762 // last one) is actually used when we will free up the humongous | |
| 763 // region in free_humongous_region(). | |
| 764 hr = NULL; | |
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765 for (uint i = first + 1; i < last; ++i) { |
| 3766 | 766 hr = region_at(i); |
| 2361 | 767 if ((i + 1) == last) { |
| 768 // last continues humongous region | |
| 769 assert(hr->bottom() < new_top && new_top <= hr->end(), | |
| 770 "new_top should fall on this region"); | |
| 771 hr->set_top(new_top); | |
|
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772 _hr_printer.alloc(G1HRPrinter::ContinuesHumongous, hr, new_top); |
| 2361 | 773 } else { |
| 774 // not last one | |
| 775 assert(new_top > hr->end(), "new_top should be above this region"); | |
| 776 hr->set_top(hr->end()); | |
|
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777 _hr_printer.alloc(G1HRPrinter::ContinuesHumongous, hr, hr->end()); |
| 2361 | 778 } |
| 779 } | |
| 780 // If we have continues humongous regions (hr != NULL), then the | |
| 781 // end of the last one should match new_end and its top should | |
| 782 // match new_top. | |
| 783 assert(hr == NULL || | |
| 784 (hr->end() == new_end && hr->top() == new_top), "sanity"); | |
| 785 | |
| 786 assert(first_hr->used() == word_size * HeapWordSize, "invariant"); | |
| 787 _summary_bytes_used += first_hr->used(); | |
| 788 _humongous_set.add(first_hr); | |
| 789 | |
| 790 return new_obj; | |
| 791 } | |
| 792 | |
| 342 | 793 // If could fit into free regions w/o expansion, try. |
| 794 // Otherwise, if can expand, do so. | |
| 795 // Otherwise, if using ex regions might help, try with ex given back. | |
| 1973 | 796 HeapWord* G1CollectedHeap::humongous_obj_allocate(size_t word_size) { |
| 2152 | 797 assert_heap_locked_or_at_safepoint(true /* should_be_vm_thread */); |
| 798 | |
| 799 verify_region_sets_optional(); | |
| 342 | 800 |
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801 size_t word_size_rounded = round_to(word_size, HeapRegion::GrainWords); |
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802 uint num_regions = (uint) (word_size_rounded / HeapRegion::GrainWords); |
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803 uint x_num = expansion_regions(); |
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804 uint fs = _hrs.free_suffix(); |
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805 uint first = humongous_obj_allocate_find_first(num_regions, word_size); |
| 3766 | 806 if (first == G1_NULL_HRS_INDEX) { |
| 2152 | 807 // The only thing we can do now is attempt expansion. |
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808 if (fs + x_num >= num_regions) { |
|
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809 // If the number of regions we're trying to allocate for this |
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810 // object is at most the number of regions in the free suffix, |
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811 // then the call to humongous_obj_allocate_find_first() above |
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812 // should have succeeded and we wouldn't be here. |
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813 // |
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814 // We should only be trying to expand when the free suffix is |
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815 // not sufficient for the object _and_ we have some expansion |
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816 // room available. |
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817 assert(num_regions > fs, "earlier allocation should have succeeded"); |
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818 |
|
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819 ergo_verbose1(ErgoHeapSizing, |
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820 "attempt heap expansion", |
|
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821 ergo_format_reason("humongous allocation request failed") |
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822 ergo_format_byte("allocation request"), |
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823 word_size * HeapWordSize); |
|
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824 if (expand((num_regions - fs) * HeapRegion::GrainBytes)) { |
| 3766 | 825 // Even though the heap was expanded, it might not have |
| 826 // reached the desired size. So, we cannot assume that the | |
| 827 // allocation will succeed. | |
|
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828 first = humongous_obj_allocate_find_first(num_regions, word_size); |
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829 } |
| 2152 | 830 } |
| 831 } | |
| 832 | |
| 2361 | 833 HeapWord* result = NULL; |
| 3766 | 834 if (first != G1_NULL_HRS_INDEX) { |
| 2361 | 835 result = |
| 836 humongous_obj_allocate_initialize_regions(first, num_regions, word_size); | |
| 837 assert(result != NULL, "it should always return a valid result"); | |
|
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838 |
|
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839 // A successful humongous object allocation changes the used space |
|
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840 // information of the old generation so we need to recalculate the |
|
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841 // sizes and update the jstat counters here. |
|
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|
842 g1mm()->update_sizes(); |
| 2152 | 843 } |
| 844 | |
| 845 verify_region_sets_optional(); | |
| 2361 | 846 |
| 847 return result; | |
| 342 | 848 } |
| 849 | |
| 1973 | 850 HeapWord* G1CollectedHeap::allocate_new_tlab(size_t word_size) { |
| 851 assert_heap_not_locked_and_not_at_safepoint(); | |
|
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852 assert(!isHumongous(word_size), "we do not allow humongous TLABs"); |
|
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853 |
|
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|
854 unsigned int dummy_gc_count_before; |
|
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855 return attempt_allocation(word_size, &dummy_gc_count_before); |
| 342 | 856 } |
| 857 | |
| 858 HeapWord* | |
| 859 G1CollectedHeap::mem_allocate(size_t word_size, | |
| 1973 | 860 bool* gc_overhead_limit_was_exceeded) { |
| 861 assert_heap_not_locked_and_not_at_safepoint(); | |
| 342 | 862 |
|
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863 // Loop until the allocation is satisified, or unsatisfied after GC. |
| 1973 | 864 for (int try_count = 1; /* we'll return */; try_count += 1) { |
| 865 unsigned int gc_count_before; | |
|
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|
866 |
|
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|
867 HeapWord* result = NULL; |
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868 if (!isHumongous(word_size)) { |
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869 result = attempt_allocation(word_size, &gc_count_before); |
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870 } else { |
|
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871 result = attempt_allocation_humongous(word_size, &gc_count_before); |
|
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|
872 } |
|
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|
873 if (result != NULL) { |
|
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|
874 return result; |
| 342 | 875 } |
| 876 | |
| 877 // Create the garbage collection operation... | |
| 1973 | 878 VM_G1CollectForAllocation op(gc_count_before, word_size); |
| 342 | 879 // ...and get the VM thread to execute it. |
| 880 VMThread::execute(&op); | |
| 1973 | 881 |
| 882 if (op.prologue_succeeded() && op.pause_succeeded()) { | |
| 883 // If the operation was successful we'll return the result even | |
| 884 // if it is NULL. If the allocation attempt failed immediately | |
| 885 // after a Full GC, it's unlikely we'll be able to allocate now. | |
| 886 HeapWord* result = op.result(); | |
| 887 if (result != NULL && !isHumongous(word_size)) { | |
| 888 // Allocations that take place on VM operations do not do any | |
| 889 // card dirtying and we have to do it here. We only have to do | |
| 890 // this for non-humongous allocations, though. | |
| 891 dirty_young_block(result, word_size); | |
| 892 } | |
| 342 | 893 return result; |
| 1973 | 894 } else { |
| 895 assert(op.result() == NULL, | |
| 896 "the result should be NULL if the VM op did not succeed"); | |
| 342 | 897 } |
| 898 | |
| 899 // Give a warning if we seem to be looping forever. | |
| 900 if ((QueuedAllocationWarningCount > 0) && | |
| 901 (try_count % QueuedAllocationWarningCount == 0)) { | |
| 1973 | 902 warning("G1CollectedHeap::mem_allocate retries %d times", try_count); |
| 342 | 903 } |
| 904 } | |
| 1973 | 905 |
| 906 ShouldNotReachHere(); | |
|
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|
907 return NULL; |
| 342 | 908 } |
| 909 | |
|
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|
910 HeapWord* G1CollectedHeap::attempt_allocation_slow(size_t word_size, |
|
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|
911 unsigned int *gc_count_before_ret) { |
|
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|
912 // Make sure you read the note in attempt_allocation_humongous(). |
|
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|
913 |
|
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|
914 assert_heap_not_locked_and_not_at_safepoint(); |
|
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|
915 assert(!isHumongous(word_size), "attempt_allocation_slow() should not " |
|
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|
916 "be called for humongous allocation requests"); |
|
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|
917 |
|
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|
918 // We should only get here after the first-level allocation attempt |
|
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|
919 // (attempt_allocation()) failed to allocate. |
|
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|
920 |
|
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|
921 // We will loop until a) we manage to successfully perform the |
|
abdfc822206f
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|
922 // allocation or b) we successfully schedule a collection which |
|
abdfc822206f
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|
923 // fails to perform the allocation. b) is the only case when we'll |
|
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|
924 // return NULL. |
|
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|
925 HeapWord* result = NULL; |
|
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|
926 for (int try_count = 1; /* we'll return */; try_count += 1) { |
|
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|
927 bool should_try_gc; |
|
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|
928 unsigned int gc_count_before; |
|
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|
929 |
|
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|
930 { |
|
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|
931 MutexLockerEx x(Heap_lock); |
|
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|
932 |
|
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|
933 result = _mutator_alloc_region.attempt_allocation_locked(word_size, |
|
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|
934 false /* bot_updates */); |
|
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|
935 if (result != NULL) { |
|
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|
936 return result; |
|
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|
937 } |
|
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|
938 |
|
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|
939 // If we reach here, attempt_allocation_locked() above failed to |
|
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|
940 // allocate a new region. So the mutator alloc region should be NULL. |
|
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|
941 assert(_mutator_alloc_region.get() == NULL, "only way to get here"); |
|
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|
942 |
|
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|
943 if (GC_locker::is_active_and_needs_gc()) { |
|
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|
944 if (g1_policy()->can_expand_young_list()) { |
|
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|
945 // No need for an ergo verbose message here, |
|
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|
946 // can_expand_young_list() does this when it returns true. |
|
2433
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|
947 result = _mutator_alloc_region.attempt_allocation_force(word_size, |
|
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|
948 false /* bot_updates */); |
|
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|
949 if (result != NULL) { |
|
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|
950 return result; |
|
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|
951 } |
|
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|
952 } |
|
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|
953 should_try_gc = false; |
|
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|
954 } else { |
|
6106
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|
955 // The GCLocker may not be active but the GCLocker initiated |
|
1d478c993020
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|
956 // GC may not yet have been performed (GCLocker::needs_gc() |
|
1d478c993020
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|
957 // returns true). In this case we do not try this GC and |
|
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958 // wait until the GCLocker initiated GC is performed, and |
|
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959 // then retry the allocation. |
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960 if (GC_locker::needs_gc()) { |
|
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961 should_try_gc = false; |
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962 } else { |
|
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963 // Read the GC count while still holding the Heap_lock. |
|
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964 gc_count_before = total_collections(); |
|
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965 should_try_gc = true; |
|
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966 } |
|
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967 } |
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968 } |
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969 |
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970 if (should_try_gc) { |
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971 bool succeeded; |
|
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972 result = do_collection_pause(word_size, gc_count_before, &succeeded); |
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973 if (result != NULL) { |
|
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974 assert(succeeded, "only way to get back a non-NULL result"); |
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975 return result; |
|
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976 } |
|
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|
977 |
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978 if (succeeded) { |
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979 // If we get here we successfully scheduled a collection which |
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980 // failed to allocate. No point in trying to allocate |
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981 // further. We'll just return NULL. |
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982 MutexLockerEx x(Heap_lock); |
|
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983 *gc_count_before_ret = total_collections(); |
|
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984 return NULL; |
|
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|
985 } |
|
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986 } else { |
|
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987 // The GCLocker is either active or the GCLocker initiated |
|
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988 // GC has not yet been performed. Stall until it is and |
|
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989 // then retry the allocation. |
|
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990 GC_locker::stall_until_clear(); |
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991 } |
|
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|
992 |
|
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993 // We can reach here if we were unsuccessul in scheduling a |
|
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994 // collection (because another thread beat us to it) or if we were |
|
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995 // stalled due to the GC locker. In either can we should retry the |
|
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996 // allocation attempt in case another thread successfully |
|
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997 // performed a collection and reclaimed enough space. We do the |
|
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998 // first attempt (without holding the Heap_lock) here and the |
|
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999 // follow-on attempt will be at the start of the next loop |
|
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1000 // iteration (after taking the Heap_lock). |
|
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1001 result = _mutator_alloc_region.attempt_allocation(word_size, |
|
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1002 false /* bot_updates */); |
|
5963
64bf7c8270cb
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1003 if (result != NULL) { |
|
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1004 return result; |
|
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|
1005 } |
|
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1006 |
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|
1007 // Give a warning if we seem to be looping forever. |
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1008 if ((QueuedAllocationWarningCount > 0) && |
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1009 (try_count % QueuedAllocationWarningCount == 0)) { |
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1010 warning("G1CollectedHeap::attempt_allocation_slow() " |
|
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1011 "retries %d times", try_count); |
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1012 } |
|
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1013 } |
|
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|
1014 |
|
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|
1015 ShouldNotReachHere(); |
|
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|
1016 return NULL; |
|
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|
1017 } |
|
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|
1018 |
|
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1019 HeapWord* G1CollectedHeap::attempt_allocation_humongous(size_t word_size, |
|
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1020 unsigned int * gc_count_before_ret) { |
|
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1021 // The structure of this method has a lot of similarities to |
|
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1022 // attempt_allocation_slow(). The reason these two were not merged |
|
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1023 // into a single one is that such a method would require several "if |
|
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1024 // allocation is not humongous do this, otherwise do that" |
|
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1025 // conditional paths which would obscure its flow. In fact, an early |
|
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|
1026 // version of this code did use a unified method which was harder to |
|
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|
1027 // follow and, as a result, it had subtle bugs that were hard to |
|
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|
1028 // track down. So keeping these two methods separate allows each to |
|
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|
1029 // be more readable. It will be good to keep these two in sync as |
|
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|
1030 // much as possible. |
|
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|
1031 |
|
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|
1032 assert_heap_not_locked_and_not_at_safepoint(); |
|
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|
1033 assert(isHumongous(word_size), "attempt_allocation_humongous() " |
|
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|
1034 "should only be called for humongous allocations"); |
|
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|
1035 |
|
4834
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|
1036 // Humongous objects can exhaust the heap quickly, so we should check if we |
|
6a78aa6ac1ff
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|
1037 // need to start a marking cycle at each humongous object allocation. We do |
|
6a78aa6ac1ff
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|
1038 // the check before we do the actual allocation. The reason for doing it |
|
6a78aa6ac1ff
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|
1039 // before the allocation is that we avoid having to keep track of the newly |
|
6a78aa6ac1ff
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|
1040 // allocated memory while we do a GC. |
|
4910
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|
1041 if (g1_policy()->need_to_start_conc_mark("concurrent humongous allocation", |
|
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|
1042 word_size)) { |
|
4834
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|
1043 collect(GCCause::_g1_humongous_allocation); |
|
6a78aa6ac1ff
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|
1044 } |
|
6a78aa6ac1ff
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|
1045 |
|
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|
1046 // We will loop until a) we manage to successfully perform the |
|
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|
1047 // allocation or b) we successfully schedule a collection which |
|
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|
1048 // fails to perform the allocation. b) is the only case when we'll |
|
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|
1049 // return NULL. |
|
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|
1050 HeapWord* result = NULL; |
|
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|
1051 for (int try_count = 1; /* we'll return */; try_count += 1) { |
|
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|
1052 bool should_try_gc; |
|
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|
1053 unsigned int gc_count_before; |
|
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|
1054 |
|
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|
1055 { |
|
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|
1056 MutexLockerEx x(Heap_lock); |
|
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|
1057 |
|
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|
1058 // Given that humongous objects are not allocated in young |
|
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|
1059 // regions, we'll first try to do the allocation without doing a |
|
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|
1060 // collection hoping that there's enough space in the heap. |
|
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|
1061 result = humongous_obj_allocate(word_size); |
|
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|
1062 if (result != NULL) { |
|
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|
1063 return result; |
|
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|
1064 } |
|
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|
1065 |
|
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|
1066 if (GC_locker::is_active_and_needs_gc()) { |
|
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|
1067 should_try_gc = false; |
|
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|
1068 } else { |
|
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|
1069 // The GCLocker may not be active but the GCLocker initiated |
|
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|
1070 // GC may not yet have been performed (GCLocker::needs_gc() |
|
1d478c993020
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|
1071 // returns true). In this case we do not try this GC and |
|
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|
1072 // wait until the GCLocker initiated GC is performed, and |
|
1d478c993020
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|
1073 // then retry the allocation. |
|
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|
1074 if (GC_locker::needs_gc()) { |
|
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1075 should_try_gc = false; |
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1076 } else { |
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1077 // Read the GC count while still holding the Heap_lock. |
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1078 gc_count_before = total_collections(); |
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1079 should_try_gc = true; |
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1080 } |
|
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1081 } |
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1082 } |
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1083 |
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1084 if (should_try_gc) { |
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1085 // If we failed to allocate the humongous object, we should try to |
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1086 // do a collection pause (if we're allowed) in case it reclaims |
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1087 // enough space for the allocation to succeed after the pause. |
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1088 |
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1089 bool succeeded; |
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1090 result = do_collection_pause(word_size, gc_count_before, &succeeded); |
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1091 if (result != NULL) { |
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1092 assert(succeeded, "only way to get back a non-NULL result"); |
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1093 return result; |
|
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1094 } |
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1095 |
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1096 if (succeeded) { |
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1097 // If we get here we successfully scheduled a collection which |
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1098 // failed to allocate. No point in trying to allocate |
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1099 // further. We'll just return NULL. |
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1100 MutexLockerEx x(Heap_lock); |
|
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1101 *gc_count_before_ret = total_collections(); |
|
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1102 return NULL; |
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1103 } |
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1104 } else { |
|
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1105 // The GCLocker is either active or the GCLocker initiated |
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1106 // GC has not yet been performed. Stall until it is and |
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1107 // then retry the allocation. |
|
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1108 GC_locker::stall_until_clear(); |
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1109 } |
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1110 |
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1111 // We can reach here if we were unsuccessul in scheduling a |
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1112 // collection (because another thread beat us to it) or if we were |
|
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1113 // stalled due to the GC locker. In either can we should retry the |
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1114 // allocation attempt in case another thread successfully |
|
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1115 // performed a collection and reclaimed enough space. Give a |
|
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1116 // warning if we seem to be looping forever. |
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1117 |
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1118 if ((QueuedAllocationWarningCount > 0) && |
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1119 (try_count % QueuedAllocationWarningCount == 0)) { |
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1120 warning("G1CollectedHeap::attempt_allocation_humongous() " |
|
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1121 "retries %d times", try_count); |
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1122 } |
|
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1123 } |
|
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1124 |
|
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1125 ShouldNotReachHere(); |
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1126 return NULL; |
|
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1127 } |
|
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1128 |
|
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1129 HeapWord* G1CollectedHeap::attempt_allocation_at_safepoint(size_t word_size, |
|
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1130 bool expect_null_mutator_alloc_region) { |
| 2152 | 1131 assert_at_safepoint(true /* should_be_vm_thread */); |
|
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1132 assert(_mutator_alloc_region.get() == NULL || |
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1133 !expect_null_mutator_alloc_region, |
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1134 "the current alloc region was unexpectedly found to be non-NULL"); |
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1135 |
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1136 if (!isHumongous(word_size)) { |
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1137 return _mutator_alloc_region.attempt_allocation_locked(word_size, |
|
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1138 false /* bot_updates */); |
|
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1139 } else { |
|
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1140 HeapWord* result = humongous_obj_allocate(word_size); |
|
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1141 if (result != NULL && g1_policy()->need_to_start_conc_mark("STW humongous allocation")) { |
|
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1142 g1_policy()->set_initiate_conc_mark_if_possible(); |
|
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1143 } |
|
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1144 return result; |
|
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1145 } |
|
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1146 |
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1147 ShouldNotReachHere(); |
| 342 | 1148 } |
| 1149 | |
| 1150 class PostMCRemSetClearClosure: public HeapRegionClosure { | |
| 1151 ModRefBarrierSet* _mr_bs; | |
| 1152 public: | |
| 1153 PostMCRemSetClearClosure(ModRefBarrierSet* mr_bs) : _mr_bs(mr_bs) {} | |
| 1154 bool doHeapRegion(HeapRegion* r) { | |
| 1155 r->reset_gc_time_stamp(); | |
| 1156 if (r->continuesHumongous()) | |
| 1157 return false; | |
| 1158 HeapRegionRemSet* hrrs = r->rem_set(); | |
| 1159 if (hrrs != NULL) hrrs->clear(); | |
| 1160 // You might think here that we could clear just the cards | |
| 1161 // corresponding to the used region. But no: if we leave a dirty card | |
| 1162 // in a region we might allocate into, then it would prevent that card | |
| 1163 // from being enqueued, and cause it to be missed. | |
| 1164 // Re: the performance cost: we shouldn't be doing full GC anyway! | |
| 1165 _mr_bs->clear(MemRegion(r->bottom(), r->end())); | |
| 1166 return false; | |
| 1167 } | |
| 1168 }; | |
| 1169 | |
| 1170 | |
| 1171 class PostMCRemSetInvalidateClosure: public HeapRegionClosure { | |
| 1172 ModRefBarrierSet* _mr_bs; | |
| 1173 public: | |
| 1174 PostMCRemSetInvalidateClosure(ModRefBarrierSet* mr_bs) : _mr_bs(mr_bs) {} | |
| 1175 bool doHeapRegion(HeapRegion* r) { | |
| 1176 if (r->continuesHumongous()) return false; | |
| 1177 if (r->used_region().word_size() != 0) { | |
| 1178 _mr_bs->invalidate(r->used_region(), true /*whole heap*/); | |
| 1179 } | |
| 1180 return false; | |
| 1181 } | |
| 1182 }; | |
| 1183 | |
|
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1184 class RebuildRSOutOfRegionClosure: public HeapRegionClosure { |
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1185 G1CollectedHeap* _g1h; |
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1186 UpdateRSOopClosure _cl; |
|
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1187 int _worker_i; |
|
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1188 public: |
|
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1189 RebuildRSOutOfRegionClosure(G1CollectedHeap* g1, int worker_i = 0) : |
| 1861 | 1190 _cl(g1->g1_rem_set(), worker_i), |
|
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1191 _worker_i(worker_i), |
|
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1192 _g1h(g1) |
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1193 { } |
|
1960
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1194 |
|
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1195 bool doHeapRegion(HeapRegion* r) { |
|
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1196 if (!r->continuesHumongous()) { |
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1197 _cl.set_from(r); |
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1198 r->oop_iterate(&_cl); |
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1199 } |
|
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1200 return false; |
|
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1201 } |
|
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1202 }; |
|
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1203 |
|
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1204 class ParRebuildRSTask: public AbstractGangTask { |
|
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1205 G1CollectedHeap* _g1; |
|
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1206 public: |
|
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1207 ParRebuildRSTask(G1CollectedHeap* g1) |
|
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1208 : AbstractGangTask("ParRebuildRSTask"), |
|
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1209 _g1(g1) |
|
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1210 { } |
|
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1211 |
|
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1212 void work(uint worker_id) { |
|
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1213 RebuildRSOutOfRegionClosure rebuild_rs(_g1, worker_id); |
|
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1214 _g1->heap_region_par_iterate_chunked(&rebuild_rs, worker_id, |
|
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1215 _g1->workers()->active_workers(), |
|
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1216 HeapRegion::RebuildRSClaimValue); |
|
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1217 } |
|
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1218 }; |
|
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1219 |
|
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1220 class PostCompactionPrinterClosure: public HeapRegionClosure { |
|
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1221 private: |
|
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1222 G1HRPrinter* _hr_printer; |
|
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1223 public: |
|
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1224 bool doHeapRegion(HeapRegion* hr) { |
|
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1225 assert(!hr->is_young(), "not expecting to find young regions"); |
|
5f6f2615433a
7049999: G1: Make the G1PrintHeapRegions output consistent and complete
tonyp
parents:
3777
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changeset
|
1226 // We only generate output for non-empty regions. |
|
5f6f2615433a
7049999: G1: Make the G1PrintHeapRegions output consistent and complete
tonyp
parents:
3777
diff
changeset
|
1227 if (!hr->is_empty()) { |
|
5f6f2615433a
7049999: G1: Make the G1PrintHeapRegions output consistent and complete
tonyp
parents:
3777
diff
changeset
|
1228 if (!hr->isHumongous()) { |
|
5f6f2615433a
7049999: G1: Make the G1PrintHeapRegions output consistent and complete
tonyp
parents:
3777
diff
changeset
|
1229 _hr_printer->post_compaction(hr, G1HRPrinter::Old); |
|
5f6f2615433a
7049999: G1: Make the G1PrintHeapRegions output consistent and complete
tonyp
parents:
3777
diff
changeset
|
1230 } else if (hr->startsHumongous()) { |
|
3986
65a8ff39a6da
7095194: G1: HeapRegion::GrainBytes, GrainWords, and CardsPerRegion should be size_t
johnc
parents:
3983
diff
changeset
|
1231 if (hr->capacity() == HeapRegion::GrainBytes) { |
|
3778
5f6f2615433a
7049999: G1: Make the G1PrintHeapRegions output consistent and complete
tonyp
parents:
3777
diff
changeset
|
1232 // single humongous region |
|
5f6f2615433a
7049999: G1: Make the G1PrintHeapRegions output consistent and complete
tonyp
parents:
3777
diff
changeset
|
1233 _hr_printer->post_compaction(hr, G1HRPrinter::SingleHumongous); |
|
5f6f2615433a
7049999: G1: Make the G1PrintHeapRegions output consistent and complete
tonyp
parents:
3777
diff
changeset
|
1234 } else { |
|
5f6f2615433a
7049999: G1: Make the G1PrintHeapRegions output consistent and complete
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parents:
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diff
changeset
|
1235 _hr_printer->post_compaction(hr, G1HRPrinter::StartsHumongous); |
|
5f6f2615433a
7049999: G1: Make the G1PrintHeapRegions output consistent and complete
tonyp
parents:
3777
diff
changeset
|
1236 } |
|
5f6f2615433a
7049999: G1: Make the G1PrintHeapRegions output consistent and complete
tonyp
parents:
3777
diff
changeset
|
1237 } else { |
|
5f6f2615433a
7049999: G1: Make the G1PrintHeapRegions output consistent and complete
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parents:
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diff
changeset
|
1238 assert(hr->continuesHumongous(), "only way to get here"); |
|
5f6f2615433a
7049999: G1: Make the G1PrintHeapRegions output consistent and complete
tonyp
parents:
3777
diff
changeset
|
1239 _hr_printer->post_compaction(hr, G1HRPrinter::ContinuesHumongous); |
|
5f6f2615433a
7049999: G1: Make the G1PrintHeapRegions output consistent and complete
tonyp
parents:
3777
diff
changeset
|
1240 } |
|
5f6f2615433a
7049999: G1: Make the G1PrintHeapRegions output consistent and complete
tonyp
parents:
3777
diff
changeset
|
1241 } |
|
5f6f2615433a
7049999: G1: Make the G1PrintHeapRegions output consistent and complete
tonyp
parents:
3777
diff
changeset
|
1242 return false; |
|
5f6f2615433a
7049999: G1: Make the G1PrintHeapRegions output consistent and complete
tonyp
parents:
3777
diff
changeset
|
1243 } |
|
5f6f2615433a
7049999: G1: Make the G1PrintHeapRegions output consistent and complete
tonyp
parents:
3777
diff
changeset
|
1244 |
|
5f6f2615433a
7049999: G1: Make the G1PrintHeapRegions output consistent and complete
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parents:
3777
diff
changeset
|
1245 PostCompactionPrinterClosure(G1HRPrinter* hr_printer) |
|
5f6f2615433a
7049999: G1: Make the G1PrintHeapRegions output consistent and complete
tonyp
parents:
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diff
changeset
|
1246 : _hr_printer(hr_printer) { } |
|
5f6f2615433a
7049999: G1: Make the G1PrintHeapRegions output consistent and complete
tonyp
parents:
3777
diff
changeset
|
1247 }; |
|
5f6f2615433a
7049999: G1: Make the G1PrintHeapRegions output consistent and complete
tonyp
parents:
3777
diff
changeset
|
1248 |
| 1973 | 1249 bool G1CollectedHeap::do_collection(bool explicit_gc, |
|
1656
4e5661ba9d98
6944166: G1: explicit GCs are not always handled correctly
tonyp
parents:
1611
diff
changeset
|
1250 bool clear_all_soft_refs, |
| 342 | 1251 size_t word_size) { |
| 2152 | 1252 assert_at_safepoint(true /* should_be_vm_thread */); |
| 1253 | |
|
1359
23b1b27ac76c
6909756: G1: guarantee(G1CollectedHeap::heap()->mark_in_progress(),"Precondition.")
tonyp
parents:
1313
diff
changeset
|
1254 if (GC_locker::check_active_before_gc()) { |
| 1973 | 1255 return false; |
|
1359
23b1b27ac76c
6909756: G1: guarantee(G1CollectedHeap::heap()->mark_in_progress(),"Precondition.")
tonyp
parents:
1313
diff
changeset
|
1256 } |
|
23b1b27ac76c
6909756: G1: guarantee(G1CollectedHeap::heap()->mark_in_progress(),"Precondition.")
tonyp
parents:
1313
diff
changeset
|
1257 |
|
2125
7246a374a9f2
6458402: 3 jvmti tests fail with CMS and +ExplicitGCInvokesConcurrent
kamg
parents:
2039
diff
changeset
|
1258 SvcGCMarker sgcm(SvcGCMarker::FULL); |
| 342 | 1259 ResourceMark rm; |
| 1260 | |
|
4872
aa3d708d67c4
7141200: log some interesting information in ring buffers for crashes
never
parents:
4787
diff
changeset
|
1261 print_heap_before_gc(); |
|
838
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
parents:
811
diff
changeset
|
1262 |
| 4072 | 1263 HRSPhaseSetter x(HRSPhaseFullGC); |
| 2152 | 1264 verify_region_sets_optional(); |
| 342 | 1265 |
|
1387
0bfd3fb24150
6858496: Clear all SoftReferences before an out-of-memory due to GC overhead limit.
jmasa
parents:
1360
diff
changeset
|
1266 const bool do_clear_all_soft_refs = clear_all_soft_refs || |
|
0bfd3fb24150
6858496: Clear all SoftReferences before an out-of-memory due to GC overhead limit.
jmasa
parents:
1360
diff
changeset
|
1267 collector_policy()->should_clear_all_soft_refs(); |
|
0bfd3fb24150
6858496: Clear all SoftReferences before an out-of-memory due to GC overhead limit.
jmasa
parents:
1360
diff
changeset
|
1268 |
|
0bfd3fb24150
6858496: Clear all SoftReferences before an out-of-memory due to GC overhead limit.
jmasa
parents:
1360
diff
changeset
|
1269 ClearedAllSoftRefs casr(do_clear_all_soft_refs, collector_policy()); |
|
0bfd3fb24150
6858496: Clear all SoftReferences before an out-of-memory due to GC overhead limit.
jmasa
parents:
1360
diff
changeset
|
1270 |
| 342 | 1271 { |
| 1272 IsGCActiveMark x; | |
| 1273 | |
| 1274 // Timing | |
| 6030 | 1275 assert(gc_cause() != GCCause::_java_lang_system_gc || explicit_gc, "invariant"); |
|
6007
5c86f8211d1e
7160728: Introduce an extra logging level for G1 logging
brutisso
parents:
5987
diff
changeset
|
1276 gclog_or_tty->date_stamp(G1Log::fine() && PrintGCDateStamps); |
|
5c86f8211d1e
7160728: Introduce an extra logging level for G1 logging
brutisso
parents:
5987
diff
changeset
|
1277 TraceCPUTime tcpu(G1Log::finer(), true, gclog_or_tty); |
| 6030 | 1278 |
|
6064
9d679effd28c
7166894: Add gc cause to GC logging for all collectors
brutisso
parents:
6059
diff
changeset
|
1279 TraceTime t(GCCauseString("Full GC", gc_cause()), G1Log::fine(), true, gclog_or_tty); |
|
3289
b52782ae3880
6946417: G1: Java VisualVM does not support G1 properly.
jmasa
parents:
3285
diff
changeset
|
1280 TraceCollectorStats tcs(g1mm()->full_collection_counters()); |
|
3356
78542e2b5e35
7036199: Adding a notification to the implementation of GarbageCollectorMXBeans
fparain
parents:
3323
diff
changeset
|
1281 TraceMemoryManagerStats tms(true /* fullGC */, gc_cause()); |
|
1089
db0d5eba9d20
6815790: G1: Missing MemoryPoolMXBeans with -XX:+UseG1GC
tonyp
parents:
1088
diff
changeset
|
1282 |
| 342 | 1283 double start = os::elapsedTime(); |
| 1284 g1_policy()->record_full_collection_start(); | |
| 1285 | |
|
4837
eff609af17d7
7127706: G1: re-enable survivors during the initial-mark pause
tonyp
parents:
4836
diff
changeset
|
1286 // Note: When we have a more flexible GC logging framework that |
|
eff609af17d7
7127706: G1: re-enable survivors during the initial-mark pause
tonyp
parents:
4836
diff
changeset
|
1287 // allows us to add optional attributes to a GC log record we |
|
eff609af17d7
7127706: G1: re-enable survivors during the initial-mark pause
tonyp
parents:
4836
diff
changeset
|
1288 // could consider timing and reporting how long we wait in the |
|
eff609af17d7
7127706: G1: re-enable survivors during the initial-mark pause
tonyp
parents:
4836
diff
changeset
|
1289 // following two methods. |
| 2152 | 1290 wait_while_free_regions_coming(); |
|
4837
eff609af17d7
7127706: G1: re-enable survivors during the initial-mark pause
tonyp
parents:
4836
diff
changeset
|
1291 // If we start the compaction before the CM threads finish |
|
eff609af17d7
7127706: G1: re-enable survivors during the initial-mark pause
tonyp
parents:
4836
diff
changeset
|
1292 // scanning the root regions we might trip them over as we'll |
|
eff609af17d7
7127706: G1: re-enable survivors during the initial-mark pause
tonyp
parents:
4836
diff
changeset
|
1293 // be moving objects / updating references. So let's wait until |
|
eff609af17d7
7127706: G1: re-enable survivors during the initial-mark pause
tonyp
parents:
4836
diff
changeset
|
1294 // they are done. By telling them to abort, they should complete |
|
eff609af17d7
7127706: G1: re-enable survivors during the initial-mark pause
tonyp
parents:
4836
diff
changeset
|
1295 // early. |
|
eff609af17d7
7127706: G1: re-enable survivors during the initial-mark pause
tonyp
parents:
4836
diff
changeset
|
1296 _cm->root_regions()->abort(); |
|
eff609af17d7
7127706: G1: re-enable survivors during the initial-mark pause
tonyp
parents:
4836
diff
changeset
|
1297 _cm->root_regions()->wait_until_scan_finished(); |
| 2361 | 1298 append_secondary_free_list_if_not_empty_with_lock(); |
| 2152 | 1299 |
| 342 | 1300 gc_prologue(true); |
|
838
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
parents:
811
diff
changeset
|
1301 increment_total_collections(true /* full gc */); |
|
6120
37552638d24a
7172388: G1: _total_full_collections should not be incremented for concurrent cycles
brutisso
parents:
6109
diff
changeset
|
1302 increment_old_marking_cycles_started(); |
| 342 | 1303 |
| 1304 size_t g1h_prev_used = used(); | |
| 1305 assert(used() == recalculate_used(), "Should be equal"); | |
| 1306 | |
| 1307 if (VerifyBeforeGC && total_collections() >= VerifyGCStartAt) { | |
| 1308 HandleMark hm; // Discard invalid handles created during verification | |
|
2433
abdfc822206f
7023069: G1: Introduce symmetric locking in the slow allocation path
tonyp
parents:
2432
diff
changeset
|
1309 gclog_or_tty->print(" VerifyBeforeGC:"); |
| 342 | 1310 prepare_for_verify(); |
| 6008 | 1311 Universe::verify(/* silent */ false, |
|
3772
6747fd0512e0
7004681: G1: Extend marking verification to Full GCs
johnc
parents:
3766
diff
changeset
|
1312 /* option */ VerifyOption_G1UsePrevMarking); |
|
6747fd0512e0
7004681: G1: Extend marking verification to Full GCs
johnc
parents:
3766
diff
changeset
|
1313 |
| 342 | 1314 } |
|
3869
7f776886a215
6810861: G1: support -XX:+{PrintClassHistogram,HeapDump}{Before,After}FullGC
ysr
parents:
3867
diff
changeset
|
1315 pre_full_gc_dump(); |
| 342 | 1316 |
| 1317 COMPILER2_PRESENT(DerivedPointerTable::clear()); | |
| 1318 | |
|
3979
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
1319 // Disable discovery and empty the discovered lists |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
1320 // for the CM ref processor. |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
1321 ref_processor_cm()->disable_discovery(); |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
1322 ref_processor_cm()->abandon_partial_discovery(); |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
1323 ref_processor_cm()->verify_no_references_recorded(); |
| 342 | 1324 |
| 1325 // Abandon current iterations of concurrent marking and concurrent | |
|
4837
eff609af17d7
7127706: G1: re-enable survivors during the initial-mark pause
tonyp
parents:
4836
diff
changeset
|
1326 // refinement, if any are in progress. We have to do this before |
|
eff609af17d7
7127706: G1: re-enable survivors during the initial-mark pause
tonyp
parents:
4836
diff
changeset
|
1327 // wait_until_scan_finished() below. |
| 342 | 1328 concurrent_mark()->abort(); |
| 1329 | |
| 1330 // Make sure we'll choose a new allocation region afterwards. | |
|
2433
abdfc822206f
7023069: G1: Introduce symmetric locking in the slow allocation path
tonyp
parents:
2432
diff
changeset
|
1331 release_mutator_alloc_region(); |
| 636 | 1332 abandon_gc_alloc_regions(); |
| 1861 | 1333 g1_rem_set()->cleanupHRRS(); |
|
1394
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
1334 |
|
3778
5f6f2615433a
7049999: G1: Make the G1PrintHeapRegions output consistent and complete
tonyp
parents:
3777
diff
changeset
|
1335 // We should call this after we retire any currently active alloc |
|
5f6f2615433a
7049999: G1: Make the G1PrintHeapRegions output consistent and complete
tonyp
parents:
3777
diff
changeset
|
1336 // regions so that all the ALLOC / RETIRE events are generated |
|
5f6f2615433a
7049999: G1: Make the G1PrintHeapRegions output consistent and complete
tonyp
parents:
3777
diff
changeset
|
1337 // before the start GC event. |
|
5f6f2615433a
7049999: G1: Make the G1PrintHeapRegions output consistent and complete
tonyp
parents:
3777
diff
changeset
|
1338 _hr_printer.start_gc(true /* full */, (size_t) total_collections()); |
|
5f6f2615433a
7049999: G1: Make the G1PrintHeapRegions output consistent and complete
tonyp
parents:
3777
diff
changeset
|
1339 |
|
1394
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
1340 // We may have added regions to the current incremental collection |
|
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
1341 // set between the last GC or pause and now. We need to clear the |
|
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
1342 // incremental collection set and then start rebuilding it afresh |
|
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
1343 // after this full GC. |
|
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
1344 abandon_collection_set(g1_policy()->inc_cset_head()); |
|
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
1345 g1_policy()->clear_incremental_cset(); |
|
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
1346 g1_policy()->stop_incremental_cset_building(); |
|
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
1347 |
| 4072 | 1348 tear_down_region_sets(false /* free_list_only */); |
| 4710 | 1349 g1_policy()->set_gcs_are_young(true); |
| 342 | 1350 |
|
3979
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
1351 // See the comments in g1CollectedHeap.hpp and |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
1352 // G1CollectedHeap::ref_processing_init() about |
|
1974
fd1d227ef1b9
6983204: G1: Nightly test nsk/regression/b4958615 failing with +ExplicitGCInvokesConcurrent
johnc
parents:
1973
diff
changeset
|
1353 // how reference processing currently works in G1. |
|
fd1d227ef1b9
6983204: G1: Nightly test nsk/regression/b4958615 failing with +ExplicitGCInvokesConcurrent
johnc
parents:
1973
diff
changeset
|
1354 |
|
3979
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
1355 // Temporarily make discovery by the STW ref processor single threaded (non-MT). |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
1356 ReferenceProcessorMTDiscoveryMutator stw_rp_disc_ser(ref_processor_stw(), false); |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
1357 |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
1358 // Temporarily clear the STW ref processor's _is_alive_non_header field. |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
1359 ReferenceProcessorIsAliveMutator stw_rp_is_alive_null(ref_processor_stw(), NULL); |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
1360 |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
1361 ref_processor_stw()->enable_discovery(true /*verify_disabled*/, true /*verify_no_refs*/); |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
1362 ref_processor_stw()->setup_policy(do_clear_all_soft_refs); |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
1363 |
| 342 | 1364 // Do collection work |
| 1365 { | |
| 1366 HandleMark hm; // Discard invalid handles created during gc | |
|
3979
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
1367 G1MarkSweep::invoke_at_safepoint(ref_processor_stw(), do_clear_all_soft_refs); |
| 342 | 1368 } |
|
3979
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
1369 |
| 2152 | 1370 assert(free_regions() == 0, "we should not have added any free regions"); |
| 4072 | 1371 rebuild_region_sets(false /* free_list_only */); |
| 342 | 1372 |
|
3979
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
1373 // Enqueue any discovered reference objects that have |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
1374 // not been removed from the discovered lists. |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
1375 ref_processor_stw()->enqueue_discovered_references(); |
| 342 | 1376 |
| 1377 COMPILER2_PRESENT(DerivedPointerTable::update_pointers()); | |
| 1378 | |
|
1089
db0d5eba9d20
6815790: G1: Missing MemoryPoolMXBeans with -XX:+UseG1GC
tonyp
parents:
1088
diff
changeset
|
1379 MemoryService::track_memory_usage(); |
|
db0d5eba9d20
6815790: G1: Missing MemoryPoolMXBeans with -XX:+UseG1GC
tonyp
parents:
1088
diff
changeset
|
1380 |
| 342 | 1381 if (VerifyAfterGC && total_collections() >= VerifyGCStartAt) { |
| 1382 HandleMark hm; // Discard invalid handles created during verification | |
| 1383 gclog_or_tty->print(" VerifyAfterGC:"); | |
|
637
25e146966e7c
6817419: G1: Enable extensive verification for humongous regions
iveresov
parents:
636
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|
1384 prepare_for_verify(); |
| 6008 | 1385 Universe::verify(/* silent */ false, |
|
3772
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|
1386 /* option */ VerifyOption_G1UsePrevMarking); |
|
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1387 |
| 342 | 1388 } |
|
3979
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|
1389 |
|
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|
1390 assert(!ref_processor_stw()->discovery_enabled(), "Postcondition"); |
|
4dfb2df418f2
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|
1391 ref_processor_stw()->verify_no_references_recorded(); |
|
4dfb2df418f2
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|
1392 |
|
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|
1393 // Note: since we've just done a full GC, concurrent |
|
4dfb2df418f2
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|
1394 // marking is no longer active. Therefore we need not |
|
4dfb2df418f2
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|
1395 // re-enable reference discovery for the CM ref processor. |
|
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|
1396 // That will be done at the start of the next marking cycle. |
|
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|
1397 assert(!ref_processor_cm()->discovery_enabled(), "Postcondition"); |
|
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|
1398 ref_processor_cm()->verify_no_references_recorded(); |
| 342 | 1399 |
| 1400 reset_gc_time_stamp(); | |
| 1401 // Since everything potentially moved, we will clear all remembered | |
|
626
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1402 // sets, and clear all cards. Later we will rebuild remebered |
|
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|
1403 // sets. We will also reset the GC time stamps of the regions. |
| 342 | 1404 PostMCRemSetClearClosure rs_clear(mr_bs()); |
| 1405 heap_region_iterate(&rs_clear); | |
| 1406 | |
| 1407 // Resize the heap if necessary. | |
|
1656
4e5661ba9d98
6944166: G1: explicit GCs are not always handled correctly
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|
1408 resize_if_necessary_after_full_collection(explicit_gc ? 0 : word_size); |
| 342 | 1409 |
|
3778
5f6f2615433a
7049999: G1: Make the G1PrintHeapRegions output consistent and complete
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|
1410 if (_hr_printer.is_active()) { |
|
5f6f2615433a
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|
1411 // We should do this after we potentially resize the heap so |
|
5f6f2615433a
7049999: G1: Make the G1PrintHeapRegions output consistent and complete
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changeset
|
1412 // that all the COMMIT / UNCOMMIT events are generated before |
|
5f6f2615433a
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|
1413 // the end GC event. |
|
5f6f2615433a
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|
1414 |
|
5f6f2615433a
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|
1415 PostCompactionPrinterClosure cl(hr_printer()); |
|
5f6f2615433a
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|
1416 heap_region_iterate(&cl); |
|
5f6f2615433a
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|
1417 |
|
5f6f2615433a
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|
1418 _hr_printer.end_gc(true /* full */, (size_t) total_collections()); |
|
5f6f2615433a
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|
1419 } |
|
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changeset
|
1420 |
| 342 | 1421 if (_cg1r->use_cache()) { |
| 1422 _cg1r->clear_and_record_card_counts(); | |
| 1423 _cg1r->clear_hot_cache(); | |
| 1424 } | |
| 1425 | |
|
626
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|
1426 // Rebuild remembered sets of all regions. |
|
1833
8b10f48633dc
6984287: Regularize how GC parallel workers are specified.
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1755
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|
1427 if (G1CollectedHeap::use_parallel_gc_threads()) { |
|
4728
441e946dc1af
7121618: Change type of number of GC workers to unsigned int.
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diff
changeset
|
1428 uint n_workers = |
|
4095
bca17e38de00
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|
1429 AdaptiveSizePolicy::calc_active_workers(workers()->total_workers(), |
|
bca17e38de00
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|
1430 workers()->active_workers(), |
|
bca17e38de00
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|
1431 Threads::number_of_non_daemon_threads()); |
|
bca17e38de00
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|
1432 assert(UseDynamicNumberOfGCThreads || |
|
bca17e38de00
6593758: RFE: Enhance GC ergonomics to dynamically choose ParallelGCThreads
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|
1433 n_workers == workers()->total_workers(), |
|
bca17e38de00
6593758: RFE: Enhance GC ergonomics to dynamically choose ParallelGCThreads
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|
1434 "If not dynamic should be using all the workers"); |
|
bca17e38de00
6593758: RFE: Enhance GC ergonomics to dynamically choose ParallelGCThreads
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|
1435 workers()->set_active_workers(n_workers); |
|
bca17e38de00
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|
1436 // Set parallel threads in the heap (_n_par_threads) only |
|
bca17e38de00
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|
1437 // before a parallel phase and always reset it to 0 after |
|
bca17e38de00
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|
1438 // the phase so that the number of parallel threads does |
|
bca17e38de00
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|
1439 // no get carried forward to a serial phase where there |
|
bca17e38de00
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|
1440 // may be code that is "possibly_parallel". |
|
bca17e38de00
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|
1441 set_par_threads(n_workers); |
|
bca17e38de00
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|
1442 |
|
626
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|
1443 ParRebuildRSTask rebuild_rs_task(this); |
|
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|
1444 assert(check_heap_region_claim_values( |
|
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|
1445 HeapRegion::InitialClaimValue), "sanity check"); |
|
4095
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6593758: RFE: Enhance GC ergonomics to dynamically choose ParallelGCThreads
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|
1446 assert(UseDynamicNumberOfGCThreads || |
|
bca17e38de00
6593758: RFE: Enhance GC ergonomics to dynamically choose ParallelGCThreads
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changeset
|
1447 workers()->active_workers() == workers()->total_workers(), |
|
bca17e38de00
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changeset
|
1448 "Unless dynamic should use total workers"); |
|
bca17e38de00
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changeset
|
1449 // Use the most recent number of active workers |
|
bca17e38de00
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diff
changeset
|
1450 assert(workers()->active_workers() > 0, |
|
bca17e38de00
6593758: RFE: Enhance GC ergonomics to dynamically choose ParallelGCThreads
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changeset
|
1451 "Active workers not properly set"); |
|
bca17e38de00
6593758: RFE: Enhance GC ergonomics to dynamically choose ParallelGCThreads
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diff
changeset
|
1452 set_par_threads(workers()->active_workers()); |
|
626
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|
1453 workers()->run_task(&rebuild_rs_task); |
|
87fa6e083d82
6760309: G1: update remembered sets during Full GCs
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diff
changeset
|
1454 set_par_threads(0); |
|
87fa6e083d82
6760309: G1: update remembered sets during Full GCs
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changeset
|
1455 assert(check_heap_region_claim_values( |
|
87fa6e083d82
6760309: G1: update remembered sets during Full GCs
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|
1456 HeapRegion::RebuildRSClaimValue), "sanity check"); |
|
87fa6e083d82
6760309: G1: update remembered sets during Full GCs
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|
1457 reset_heap_region_claim_values(); |
|
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changeset
|
1458 } else { |
|
87fa6e083d82
6760309: G1: update remembered sets during Full GCs
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diff
changeset
|
1459 RebuildRSOutOfRegionClosure rebuild_rs(this); |
|
87fa6e083d82
6760309: G1: update remembered sets during Full GCs
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|
1460 heap_region_iterate(&rebuild_rs); |
|
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|
1461 } |
|
87fa6e083d82
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changeset
|
1462 |
|
6007
5c86f8211d1e
7160728: Introduce an extra logging level for G1 logging
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5987
diff
changeset
|
1463 if (G1Log::fine()) { |
| 342 | 1464 print_size_transition(gclog_or_tty, g1h_prev_used, used(), capacity()); |
| 1465 } | |
| 1466 | |
| 1467 if (true) { // FIXME | |
| 1468 // Ask the permanent generation to adjust size for full collections | |
| 1469 perm()->compute_new_size(); | |
| 1470 } | |
| 1471 | |
|
1394
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
1472 // Start a new incremental collection set for the next pause |
|
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
1473 assert(g1_policy()->collection_set() == NULL, "must be"); |
|
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
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1391
diff
changeset
|
1474 g1_policy()->start_incremental_cset_building(); |
|
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
1475 |
|
1316cec51b4d
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johnc
parents:
1391
diff
changeset
|
1476 // 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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diff
changeset
|
1477 // regions to the incremental collection set for the next |
|
1316cec51b4d
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diff
changeset
|
1478 // evacuation pause. |
|
1316cec51b4d
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diff
changeset
|
1479 clear_cset_fast_test(); |
|
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
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1391
diff
changeset
|
1480 |
|
2433
abdfc822206f
7023069: G1: Introduce symmetric locking in the slow allocation path
tonyp
parents:
2432
diff
changeset
|
1481 init_mutator_alloc_region(); |
|
abdfc822206f
7023069: G1: Introduce symmetric locking in the slow allocation path
tonyp
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2432
diff
changeset
|
1482 |
| 342 | 1483 double end = os::elapsedTime(); |
| 1484 g1_policy()->record_full_collection_end(); | |
| 1485 | |
|
546
05c6d52fa7a9
6690928: Use spinning in combination with yields for workstealing termination.
jmasa
parents:
545
diff
changeset
|
1486 #ifdef TRACESPINNING |
|
05c6d52fa7a9
6690928: Use spinning in combination with yields for workstealing termination.
jmasa
parents:
545
diff
changeset
|
1487 ParallelTaskTerminator::print_termination_counts(); |
|
05c6d52fa7a9
6690928: Use spinning in combination with yields for workstealing termination.
jmasa
parents:
545
diff
changeset
|
1488 #endif |
|
05c6d52fa7a9
6690928: Use spinning in combination with yields for workstealing termination.
jmasa
parents:
545
diff
changeset
|
1489 |
| 342 | 1490 gc_epilogue(true); |
| 1491 | |
| 794 | 1492 // Discard all rset updates |
| 1493 JavaThread::dirty_card_queue_set().abandon_logs(); | |
|
616
4f360ec815ba
6720309: G1: don't synchronously update RSet during evacuation pauses
iveresov
parents:
595
diff
changeset
|
1494 assert(!G1DeferredRSUpdate |
|
4f360ec815ba
6720309: G1: don't synchronously update RSet during evacuation pauses
iveresov
parents:
595
diff
changeset
|
1495 || (G1DeferredRSUpdate && (dirty_card_queue_set().completed_buffers_num() == 0)), "Should not be any"); |
|
6121
b9442ac22f59
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|
1496 |
|
b9442ac22f59
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changeset
|
1497 _young_list->reset_sampled_info(); |
|
b9442ac22f59
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|
1498 // At this point there should be no regions in the |
|
b9442ac22f59
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changeset
|
1499 // entire heap tagged as young. |
|
b9442ac22f59
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|
1500 assert( check_young_list_empty(true /* check_heap */), |
|
b9442ac22f59
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diff
changeset
|
1501 "young list should be empty at this point"); |
|
b9442ac22f59
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|
1502 |
|
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changeset
|
1503 // Update the number of full collections that have been completed. |
|
b9442ac22f59
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|
1504 increment_old_marking_cycles_completed(false /* concurrent */); |
|
b9442ac22f59
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|
1505 |
|
b9442ac22f59
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changeset
|
1506 _hrs.verify_optional(); |
|
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changeset
|
1507 verify_region_sets_optional(); |
|
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|
1508 |
|
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changeset
|
1509 print_heap_after_gc(); |
|
b9442ac22f59
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|
1510 |
|
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changeset
|
1511 // We must call G1MonitoringSupport::update_sizes() in the same scoping level |
|
b9442ac22f59
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|
1512 // as an active TraceMemoryManagerStats object (i.e. before the destructor for the |
|
b9442ac22f59
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|
1513 // TraceMemoryManagerStats is called) so that the G1 memory pools are updated |
|
b9442ac22f59
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|
1514 // before any GC notifications are raised. |
|
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|
1515 g1mm()->update_sizes(); |
|
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|
1516 } |
|
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|
1517 |
|
3869
7f776886a215
6810861: G1: support -XX:+{PrintClassHistogram,HeapDump}{Before,After}FullGC
ysr
parents:
3867
diff
changeset
|
1518 post_full_gc_dump(); |
| 1973 | 1519 |
| 1520 return true; | |
| 342 | 1521 } |
| 1522 | |
| 1523 void G1CollectedHeap::do_full_collection(bool clear_all_soft_refs) { | |
| 1973 | 1524 // do_collection() will return whether it succeeded in performing |
| 1525 // the GC. Currently, there is no facility on the | |
| 1526 // do_full_collection() API to notify the caller than the collection | |
| 1527 // did not succeed (e.g., because it was locked out by the GC | |
| 1528 // locker). So, right now, we'll ignore the return value. | |
| 1529 bool dummy = do_collection(true, /* explicit_gc */ | |
| 1530 clear_all_soft_refs, | |
| 1531 0 /* word_size */); | |
| 342 | 1532 } |
| 1533 | |
| 1534 // This code is mostly copied from TenuredGeneration. | |
| 1535 void | |
| 1536 G1CollectedHeap:: | |
| 1537 resize_if_necessary_after_full_collection(size_t word_size) { | |
| 1538 assert(MinHeapFreeRatio <= MaxHeapFreeRatio, "sanity check"); | |
| 1539 | |
| 1540 // Include the current allocation, if any, and bytes that will be | |
| 1541 // pre-allocated to support collections, as "used". | |
| 1542 const size_t used_after_gc = used(); | |
| 1543 const size_t capacity_after_gc = capacity(); | |
| 1544 const size_t free_after_gc = capacity_after_gc - used_after_gc; | |
| 1545 | |
|
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1546 // This is enforced in arguments.cpp. |
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1547 assert(MinHeapFreeRatio <= MaxHeapFreeRatio, |
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1548 "otherwise the code below doesn't make sense"); |
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1549 |
| 342 | 1550 // We don't have floating point command-line arguments |
|
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1551 const double minimum_free_percentage = (double) MinHeapFreeRatio / 100.0; |
| 342 | 1552 const double maximum_used_percentage = 1.0 - minimum_free_percentage; |
|
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1553 const double maximum_free_percentage = (double) MaxHeapFreeRatio / 100.0; |
| 342 | 1554 const double minimum_used_percentage = 1.0 - maximum_free_percentage; |
| 1555 | |
|
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1556 const size_t min_heap_size = collector_policy()->min_heap_byte_size(); |
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1557 const size_t max_heap_size = collector_policy()->max_heap_byte_size(); |
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1558 |
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1559 // We have to be careful here as these two calculations can overflow |
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1560 // 32-bit size_t's. |
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1561 double used_after_gc_d = (double) used_after_gc; |
|
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1562 double minimum_desired_capacity_d = used_after_gc_d / maximum_used_percentage; |
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1563 double maximum_desired_capacity_d = used_after_gc_d / minimum_used_percentage; |
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1564 |
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1565 // Let's make sure that they are both under the max heap size, which |
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1566 // by default will make them fit into a size_t. |
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1567 double desired_capacity_upper_bound = (double) max_heap_size; |
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1568 minimum_desired_capacity_d = MIN2(minimum_desired_capacity_d, |
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1569 desired_capacity_upper_bound); |
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1570 maximum_desired_capacity_d = MIN2(maximum_desired_capacity_d, |
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1571 desired_capacity_upper_bound); |
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1572 |
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1573 // We can now safely turn them into size_t's. |
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1574 size_t minimum_desired_capacity = (size_t) minimum_desired_capacity_d; |
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1575 size_t maximum_desired_capacity = (size_t) maximum_desired_capacity_d; |
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1576 |
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1577 // This assert only makes sense here, before we adjust them |
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1578 // with respect to the min and max heap size. |
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1579 assert(minimum_desired_capacity <= maximum_desired_capacity, |
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1580 err_msg("minimum_desired_capacity = "SIZE_FORMAT", " |
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1581 "maximum_desired_capacity = "SIZE_FORMAT, |
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1582 minimum_desired_capacity, maximum_desired_capacity)); |
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1583 |
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1584 // Should not be greater than the heap max size. No need to adjust |
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1585 // it with respect to the heap min size as it's a lower bound (i.e., |
|
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1586 // we'll try to make the capacity larger than it, not smaller). |
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1587 minimum_desired_capacity = MIN2(minimum_desired_capacity, max_heap_size); |
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1588 // Should not be less than the heap min size. No need to adjust it |
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1589 // with respect to the heap max size as it's an upper bound (i.e., |
|
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1590 // we'll try to make the capacity smaller than it, not greater). |
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1591 maximum_desired_capacity = MAX2(maximum_desired_capacity, min_heap_size); |
| 342 | 1592 |
|
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1593 if (capacity_after_gc < minimum_desired_capacity) { |
| 342 | 1594 // Don't expand unless it's significant |
| 1595 size_t expand_bytes = minimum_desired_capacity - capacity_after_gc; | |
|
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1596 ergo_verbose4(ErgoHeapSizing, |
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1597 "attempt heap expansion", |
|
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1598 ergo_format_reason("capacity lower than " |
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1599 "min desired capacity after Full GC") |
|
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1600 ergo_format_byte("capacity") |
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1601 ergo_format_byte("occupancy") |
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1602 ergo_format_byte_perc("min desired capacity"), |
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1603 capacity_after_gc, used_after_gc, |
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1604 minimum_desired_capacity, (double) MinHeapFreeRatio); |
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1605 expand(expand_bytes); |
| 342 | 1606 |
| 1607 // No expansion, now see if we want to shrink | |
|
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1608 } else if (capacity_after_gc > maximum_desired_capacity) { |
| 342 | 1609 // Capacity too large, compute shrinking size |
| 1610 size_t shrink_bytes = capacity_after_gc - maximum_desired_capacity; | |
|
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1611 ergo_verbose4(ErgoHeapSizing, |
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1612 "attempt heap shrinking", |
|
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1613 ergo_format_reason("capacity higher than " |
|
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1614 "max desired capacity after Full GC") |
|
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|
1615 ergo_format_byte("capacity") |
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|
1616 ergo_format_byte("occupancy") |
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1617 ergo_format_byte_perc("max desired capacity"), |
|
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1618 capacity_after_gc, used_after_gc, |
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|
1619 maximum_desired_capacity, (double) MaxHeapFreeRatio); |
| 342 | 1620 shrink(shrink_bytes); |
| 1621 } | |
| 1622 } | |
| 1623 | |
| 1624 | |
| 1625 HeapWord* | |
| 1973 | 1626 G1CollectedHeap::satisfy_failed_allocation(size_t word_size, |
| 1627 bool* succeeded) { | |
| 2152 | 1628 assert_at_safepoint(true /* should_be_vm_thread */); |
| 1973 | 1629 |
| 1630 *succeeded = true; | |
| 1631 // Let's attempt the allocation first. | |
|
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1632 HeapWord* result = |
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1633 attempt_allocation_at_safepoint(word_size, |
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1634 false /* expect_null_mutator_alloc_region */); |
| 1973 | 1635 if (result != NULL) { |
| 1636 assert(*succeeded, "sanity"); | |
| 1637 return result; | |
| 1638 } | |
| 342 | 1639 |
| 1640 // In a G1 heap, we're supposed to keep allocation from failing by | |
| 1641 // incremental pauses. Therefore, at least for now, we'll favor | |
| 1642 // expansion over collection. (This might change in the future if we can | |
| 1643 // do something smarter than full collection to satisfy a failed alloc.) | |
| 1644 result = expand_and_allocate(word_size); | |
| 1645 if (result != NULL) { | |
| 1973 | 1646 assert(*succeeded, "sanity"); |
| 342 | 1647 return result; |
| 1648 } | |
| 1649 | |
| 1973 | 1650 // Expansion didn't work, we'll try to do a Full GC. |
| 1651 bool gc_succeeded = do_collection(false, /* explicit_gc */ | |
| 1652 false, /* clear_all_soft_refs */ | |
| 1653 word_size); | |
| 1654 if (!gc_succeeded) { | |
| 1655 *succeeded = false; | |
| 1656 return NULL; | |
| 1657 } | |
| 1658 | |
| 1659 // Retry the allocation | |
| 1660 result = attempt_allocation_at_safepoint(word_size, | |
|
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1661 true /* expect_null_mutator_alloc_region */); |
| 342 | 1662 if (result != NULL) { |
| 1973 | 1663 assert(*succeeded, "sanity"); |
| 342 | 1664 return result; |
| 1665 } | |
| 1666 | |
| 1973 | 1667 // Then, try a Full GC that will collect all soft references. |
| 1668 gc_succeeded = do_collection(false, /* explicit_gc */ | |
| 1669 true, /* clear_all_soft_refs */ | |
| 1670 word_size); | |
| 1671 if (!gc_succeeded) { | |
| 1672 *succeeded = false; | |
| 1673 return NULL; | |
| 1674 } | |
| 1675 | |
| 1676 // Retry the allocation once more | |
| 1677 result = attempt_allocation_at_safepoint(word_size, | |
|
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|
1678 true /* expect_null_mutator_alloc_region */); |
| 342 | 1679 if (result != NULL) { |
| 1973 | 1680 assert(*succeeded, "sanity"); |
| 342 | 1681 return result; |
| 1682 } | |
| 1683 | |
|
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1684 assert(!collector_policy()->should_clear_all_soft_refs(), |
| 1973 | 1685 "Flag should have been handled and cleared prior to this point"); |
|
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1686 |
| 342 | 1687 // What else? We might try synchronous finalization later. If the total |
| 1688 // space available is large enough for the allocation, then a more | |
| 1689 // complete compaction phase than we've tried so far might be | |
| 1690 // appropriate. | |
| 1973 | 1691 assert(*succeeded, "sanity"); |
| 342 | 1692 return NULL; |
| 1693 } | |
| 1694 | |
| 1695 // Attempting to expand the heap sufficiently | |
| 1696 // to support an allocation of the given "word_size". If | |
| 1697 // successful, perform the allocation and return the address of the | |
| 1698 // allocated block, or else "NULL". | |
| 1699 | |
| 1700 HeapWord* G1CollectedHeap::expand_and_allocate(size_t word_size) { | |
| 2152 | 1701 assert_at_safepoint(true /* should_be_vm_thread */); |
| 1702 | |
| 1703 verify_region_sets_optional(); | |
| 1973 | 1704 |
|
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1705 size_t expand_bytes = MAX2(word_size * HeapWordSize, MinHeapDeltaBytes); |
|
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1706 ergo_verbose1(ErgoHeapSizing, |
|
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1707 "attempt heap expansion", |
|
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1708 ergo_format_reason("allocation request failed") |
|
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1709 ergo_format_byte("allocation request"), |
|
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1710 word_size * HeapWordSize); |
|
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1711 if (expand(expand_bytes)) { |
| 3766 | 1712 _hrs.verify_optional(); |
|
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1713 verify_region_sets_optional(); |
|
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1714 return attempt_allocation_at_safepoint(word_size, |
|
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1715 false /* expect_null_mutator_alloc_region */); |
|
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1716 } |
|
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1717 return NULL; |
| 342 | 1718 } |
| 1719 | |
| 3766 | 1720 void G1CollectedHeap::update_committed_space(HeapWord* old_end, |
| 1721 HeapWord* new_end) { | |
| 1722 assert(old_end != new_end, "don't call this otherwise"); | |
| 1723 assert((HeapWord*) _g1_storage.high() == new_end, "invariant"); | |
| 1724 | |
| 1725 // Update the committed mem region. | |
| 1726 _g1_committed.set_end(new_end); | |
| 1727 // Tell the card table about the update. | |
| 1728 Universe::heap()->barrier_set()->resize_covered_region(_g1_committed); | |
| 1729 // Tell the BOT about the update. | |
| 1730 _bot_shared->resize(_g1_committed.word_size()); | |
| 1731 } | |
| 1732 | |
|
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1733 bool G1CollectedHeap::expand(size_t expand_bytes) { |
| 342 | 1734 size_t old_mem_size = _g1_storage.committed_size(); |
|
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1735 size_t aligned_expand_bytes = ReservedSpace::page_align_size_up(expand_bytes); |
| 342 | 1736 aligned_expand_bytes = align_size_up(aligned_expand_bytes, |
| 1737 HeapRegion::GrainBytes); | |
|
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1738 ergo_verbose2(ErgoHeapSizing, |
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1739 "expand the heap", |
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1740 ergo_format_byte("requested expansion amount") |
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1741 ergo_format_byte("attempted expansion amount"), |
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1742 expand_bytes, aligned_expand_bytes); |
|
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1743 |
| 3766 | 1744 // First commit the memory. |
| 1745 HeapWord* old_end = (HeapWord*) _g1_storage.high(); | |
|
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1746 bool successful = _g1_storage.expand_by(aligned_expand_bytes); |
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1747 if (successful) { |
| 3766 | 1748 // Then propagate this update to the necessary data structures. |
| 1749 HeapWord* new_end = (HeapWord*) _g1_storage.high(); | |
| 1750 update_committed_space(old_end, new_end); | |
| 1751 | |
| 1752 FreeRegionList expansion_list("Local Expansion List"); | |
| 1753 MemRegion mr = _hrs.expand_by(old_end, new_end, &expansion_list); | |
| 1754 assert(mr.start() == old_end, "post-condition"); | |
| 1755 // mr might be a smaller region than what was requested if | |
| 1756 // expand_by() was unable to allocate the HeapRegion instances | |
| 1757 assert(mr.end() <= new_end, "post-condition"); | |
| 1758 | |
| 1759 size_t actual_expand_bytes = mr.byte_size(); | |
| 1760 assert(actual_expand_bytes <= aligned_expand_bytes, "post-condition"); | |
| 1761 assert(actual_expand_bytes == expansion_list.total_capacity_bytes(), | |
| 1762 "post-condition"); | |
| 1763 if (actual_expand_bytes < aligned_expand_bytes) { | |
| 1764 // We could not expand _hrs to the desired size. In this case we | |
| 1765 // need to shrink the committed space accordingly. | |
| 1766 assert(mr.end() < new_end, "invariant"); | |
| 1767 | |
| 1768 size_t diff_bytes = aligned_expand_bytes - actual_expand_bytes; | |
| 1769 // First uncommit the memory. | |
| 1770 _g1_storage.shrink_by(diff_bytes); | |
| 1771 // Then propagate this update to the necessary data structures. | |
| 1772 update_committed_space(new_end, mr.end()); | |
|
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1773 } |
| 3766 | 1774 _free_list.add_as_tail(&expansion_list); |
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1775 |
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1776 if (_hr_printer.is_active()) { |
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1777 HeapWord* curr = mr.start(); |
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1778 while (curr < mr.end()) { |
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1779 HeapWord* curr_end = curr + HeapRegion::GrainWords; |
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1780 _hr_printer.commit(curr, curr_end); |
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1781 curr = curr_end; |
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1782 } |
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1783 assert(curr == mr.end(), "post-condition"); |
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1784 } |
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1785 g1_policy()->record_new_heap_size(n_regions()); |
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1786 } else { |
|
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1787 ergo_verbose0(ErgoHeapSizing, |
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1788 "did not expand the heap", |
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1789 ergo_format_reason("heap expansion operation failed")); |
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1790 // The expansion of the virtual storage space was unsuccessful. |
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1791 // Let's see if it was because we ran out of swap. |
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1792 if (G1ExitOnExpansionFailure && |
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1793 _g1_storage.uncommitted_size() >= aligned_expand_bytes) { |
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1794 // We had head room... |
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1795 vm_exit_out_of_memory(aligned_expand_bytes, "G1 heap expansion"); |
| 342 | 1796 } |
| 1797 } | |
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1798 return successful; |
| 342 | 1799 } |
| 1800 | |
| 3766 | 1801 void G1CollectedHeap::shrink_helper(size_t shrink_bytes) { |
| 342 | 1802 size_t old_mem_size = _g1_storage.committed_size(); |
| 1803 size_t aligned_shrink_bytes = | |
| 1804 ReservedSpace::page_align_size_down(shrink_bytes); | |
| 1805 aligned_shrink_bytes = align_size_down(aligned_shrink_bytes, | |
| 1806 HeapRegion::GrainBytes); | |
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1807 uint num_regions_deleted = 0; |
| 3766 | 1808 MemRegion mr = _hrs.shrink_by(aligned_shrink_bytes, &num_regions_deleted); |
| 1809 HeapWord* old_end = (HeapWord*) _g1_storage.high(); | |
| 1810 assert(mr.end() == old_end, "post-condition"); | |
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1811 |
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1812 ergo_verbose3(ErgoHeapSizing, |
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1813 "shrink the heap", |
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1814 ergo_format_byte("requested shrinking amount") |
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1815 ergo_format_byte("aligned shrinking amount") |
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1816 ergo_format_byte("attempted shrinking amount"), |
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1817 shrink_bytes, aligned_shrink_bytes, mr.byte_size()); |
| 3766 | 1818 if (mr.byte_size() > 0) { |
|
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1819 if (_hr_printer.is_active()) { |
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1820 HeapWord* curr = mr.end(); |
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1821 while (curr > mr.start()) { |
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1822 HeapWord* curr_end = curr; |
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1823 curr -= HeapRegion::GrainWords; |
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1824 _hr_printer.uncommit(curr, curr_end); |
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1825 } |
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1826 assert(curr == mr.start(), "post-condition"); |
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1827 } |
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1828 |
| 342 | 1829 _g1_storage.shrink_by(mr.byte_size()); |
| 3766 | 1830 HeapWord* new_end = (HeapWord*) _g1_storage.high(); |
| 1831 assert(mr.start() == new_end, "post-condition"); | |
| 1832 | |
| 1833 _expansion_regions += num_regions_deleted; | |
| 1834 update_committed_space(old_end, new_end); | |
| 1835 HeapRegionRemSet::shrink_heap(n_regions()); | |
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1836 g1_policy()->record_new_heap_size(n_regions()); |
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1837 } else { |
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1838 ergo_verbose0(ErgoHeapSizing, |
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1839 "did not shrink the heap", |
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1840 ergo_format_reason("heap shrinking operation failed")); |
| 342 | 1841 } |
| 1842 } | |
| 1843 | |
| 1844 void G1CollectedHeap::shrink(size_t shrink_bytes) { | |
| 2152 | 1845 verify_region_sets_optional(); |
| 1846 | |
|
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1847 // We should only reach here at the end of a Full GC which means we |
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1848 // should not not be holding to any GC alloc regions. The method |
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1849 // below will make sure of that and do any remaining clean up. |
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1850 abandon_gc_alloc_regions(); |
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1851 |
| 2152 | 1852 // Instead of tearing down / rebuilding the free lists here, we |
| 1853 // could instead use the remove_all_pending() method on free_list to | |
| 1854 // remove only the ones that we need to remove. | |
| 4072 | 1855 tear_down_region_sets(true /* free_list_only */); |
| 342 | 1856 shrink_helper(shrink_bytes); |
| 4072 | 1857 rebuild_region_sets(true /* free_list_only */); |
| 2152 | 1858 |
| 3766 | 1859 _hrs.verify_optional(); |
| 2152 | 1860 verify_region_sets_optional(); |
| 342 | 1861 } |
| 1862 | |
| 1863 // Public methods. | |
| 1864 | |
| 1865 #ifdef _MSC_VER // the use of 'this' below gets a warning, make it go away | |
| 1866 #pragma warning( disable:4355 ) // 'this' : used in base member initializer list | |
| 1867 #endif // _MSC_VER | |
| 1868 | |
| 1869 | |
| 1870 G1CollectedHeap::G1CollectedHeap(G1CollectorPolicy* policy_) : | |
| 1871 SharedHeap(policy_), | |
| 1872 _g1_policy(policy_), | |
| 1111 | 1873 _dirty_card_queue_set(false), |
| 1705 | 1874 _into_cset_dirty_card_queue_set(false), |
|
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1875 _is_alive_closure_cm(this), |
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1876 _is_alive_closure_stw(this), |
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1877 _ref_processor_cm(NULL), |
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1878 _ref_processor_stw(NULL), |
| 342 | 1879 _process_strong_tasks(new SubTasksDone(G1H_PS_NumElements)), |
| 1880 _bot_shared(NULL), | |
| 1881 _objs_with_preserved_marks(NULL), _preserved_marks_of_objs(NULL), | |
| 1882 _evac_failure_scan_stack(NULL) , | |
| 1883 _mark_in_progress(false), | |
| 2152 | 1884 _cg1r(NULL), _summary_bytes_used(0), |
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1885 _g1mm(NULL), |
| 342 | 1886 _refine_cte_cl(NULL), |
| 1887 _full_collection(false), | |
| 2152 | 1888 _free_list("Master Free List"), |
| 1889 _secondary_free_list("Secondary Free List"), | |
| 4072 | 1890 _old_set("Old Set"), |
| 2152 | 1891 _humongous_set("Master Humongous Set"), |
| 1892 _free_regions_coming(false), | |
| 342 | 1893 _young_list(new YoungList(this)), |
| 1894 _gc_time_stamp(0), | |
|
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1895 _retained_old_gc_alloc_region(NULL), |
|
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1896 _expand_heap_after_alloc_failure(true), |
| 526 | 1897 _surviving_young_words(NULL), |
|
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1898 _old_marking_cycles_started(0), |
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1899 _old_marking_cycles_completed(0), |
| 526 | 1900 _in_cset_fast_test(NULL), |
|
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1901 _in_cset_fast_test_base(NULL), |
|
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1902 _dirty_cards_region_list(NULL), |
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1903 _worker_cset_start_region(NULL), |
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1904 _worker_cset_start_region_time_stamp(NULL) { |
| 342 | 1905 _g1h = this; // To catch bugs. |
| 1906 if (_process_strong_tasks == NULL || !_process_strong_tasks->valid()) { | |
| 1907 vm_exit_during_initialization("Failed necessary allocation."); | |
| 1908 } | |
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1909 |
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1910 _humongous_object_threshold_in_words = HeapRegion::GrainWords / 2; |
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1911 |
| 342 | 1912 int n_queues = MAX2((int)ParallelGCThreads, 1); |
| 1913 _task_queues = new RefToScanQueueSet(n_queues); | |
| 1914 | |
| 1915 int n_rem_sets = HeapRegionRemSet::num_par_rem_sets(); | |
| 1916 assert(n_rem_sets > 0, "Invariant."); | |
| 1917 | |
| 1918 HeapRegionRemSetIterator** iter_arr = | |
| 1919 NEW_C_HEAP_ARRAY(HeapRegionRemSetIterator*, n_queues); | |
| 1920 for (int i = 0; i < n_queues; i++) { | |
| 1921 iter_arr[i] = new HeapRegionRemSetIterator(); | |
| 1922 } | |
| 1923 _rem_set_iterator = iter_arr; | |
| 1924 | |
|
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1925 _worker_cset_start_region = NEW_C_HEAP_ARRAY(HeapRegion*, n_queues); |
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1926 _worker_cset_start_region_time_stamp = NEW_C_HEAP_ARRAY(unsigned int, n_queues); |
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1927 |
| 342 | 1928 for (int i = 0; i < n_queues; i++) { |
| 1929 RefToScanQueue* q = new RefToScanQueue(); | |
| 1930 q->initialize(); | |
| 1931 _task_queues->register_queue(i, q); | |
| 1932 } | |
| 1933 | |
|
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1934 clear_cset_start_regions(); |
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1935 |
| 342 | 1936 guarantee(_task_queues != NULL, "task_queues allocation failure."); |
| 1937 } | |
| 1938 | |
| 1939 jint G1CollectedHeap::initialize() { | |
| 1166 | 1940 CollectedHeap::pre_initialize(); |
| 342 | 1941 os::enable_vtime(); |
| 1942 | |
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1943 G1Log::init(); |
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1944 |
| 342 | 1945 // Necessary to satisfy locking discipline assertions. |
| 1946 | |
| 1947 MutexLocker x(Heap_lock); | |
| 1948 | |
|
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1949 // We have to initialize the printer before committing the heap, as |
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1950 // it will be used then. |
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1951 _hr_printer.set_active(G1PrintHeapRegions); |
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1952 |
| 342 | 1953 // While there are no constraints in the GC code that HeapWordSize |
| 1954 // be any particular value, there are multiple other areas in the | |
| 1955 // system which believe this to be true (e.g. oop->object_size in some | |
| 1956 // cases incorrectly returns the size in wordSize units rather than | |
| 1957 // HeapWordSize). | |
| 1958 guarantee(HeapWordSize == wordSize, "HeapWordSize must equal wordSize"); | |
| 1959 | |
| 1960 size_t init_byte_size = collector_policy()->initial_heap_byte_size(); | |
| 1961 size_t max_byte_size = collector_policy()->max_heap_byte_size(); | |
| 1962 | |
| 1963 // Ensure that the sizes are properly aligned. | |
| 1964 Universe::check_alignment(init_byte_size, HeapRegion::GrainBytes, "g1 heap"); | |
| 1965 Universe::check_alignment(max_byte_size, HeapRegion::GrainBytes, "g1 heap"); | |
| 1966 | |
| 1967 _cg1r = new ConcurrentG1Refine(); | |
| 1968 | |
| 1969 // Reserve the maximum. | |
| 1970 PermanentGenerationSpec* pgs = collector_policy()->permanent_generation(); | |
| 1971 // Includes the perm-gen. | |
|
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1972 |
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1973 // When compressed oops are enabled, the preferred heap base |
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1974 // is calculated by subtracting the requested size from the |
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1975 // 32Gb boundary and using the result as the base address for |
|
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1976 // heap reservation. If the requested size is not aligned to |
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1977 // HeapRegion::GrainBytes (i.e. the alignment that is passed |
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1978 // into the ReservedHeapSpace constructor) then the actual |
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1979 // base of the reserved heap may end up differing from the |
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1980 // address that was requested (i.e. the preferred heap base). |
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1981 // If this happens then we could end up using a non-optimal |
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1982 // compressed oops mode. |
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1983 |
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1984 // Since max_byte_size is aligned to the size of a heap region (checked |
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1985 // above), we also need to align the perm gen size as it might not be. |
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1986 const size_t total_reserved = max_byte_size + |
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1987 align_size_up(pgs->max_size(), HeapRegion::GrainBytes); |
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1988 Universe::check_alignment(total_reserved, HeapRegion::GrainBytes, "g1 heap and perm"); |
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1989 |
|
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1990 char* addr = Universe::preferred_heap_base(total_reserved, Universe::UnscaledNarrowOop); |
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1991 |
|
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1992 ReservedHeapSpace heap_rs(total_reserved, HeapRegion::GrainBytes, |
|
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1993 UseLargePages, addr); |
|
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1994 |
|
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1995 if (UseCompressedOops) { |
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1996 if (addr != NULL && !heap_rs.is_reserved()) { |
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1997 // Failed to reserve at specified address - the requested memory |
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1998 // region is taken already, for example, by 'java' launcher. |
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1999 // Try again to reserver heap higher. |
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2000 addr = Universe::preferred_heap_base(total_reserved, Universe::ZeroBasedNarrowOop); |
|
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2001 |
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2002 ReservedHeapSpace heap_rs0(total_reserved, HeapRegion::GrainBytes, |
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2003 UseLargePages, addr); |
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2004 |
|
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2005 if (addr != NULL && !heap_rs0.is_reserved()) { |
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2006 // Failed to reserve at specified address again - give up. |
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2007 addr = Universe::preferred_heap_base(total_reserved, Universe::HeapBasedNarrowOop); |
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2008 assert(addr == NULL, ""); |
|
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2009 |
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2010 ReservedHeapSpace heap_rs1(total_reserved, HeapRegion::GrainBytes, |
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2011 UseLargePages, addr); |
|
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2012 heap_rs = heap_rs1; |
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2013 } else { |
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2014 heap_rs = heap_rs0; |
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2015 } |
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2016 } |
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2017 } |
| 342 | 2018 |
| 2019 if (!heap_rs.is_reserved()) { | |
| 2020 vm_exit_during_initialization("Could not reserve enough space for object heap"); | |
| 2021 return JNI_ENOMEM; | |
| 2022 } | |
| 2023 | |
| 2024 // It is important to do this in a way such that concurrent readers can't | |
| 2025 // temporarily think somethings in the heap. (I've actually seen this | |
| 2026 // happen in asserts: DLD.) | |
| 2027 _reserved.set_word_size(0); | |
| 2028 _reserved.set_start((HeapWord*)heap_rs.base()); | |
| 2029 _reserved.set_end((HeapWord*)(heap_rs.base() + heap_rs.size())); | |
| 2030 | |
|
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2031 _expansion_regions = (uint) (max_byte_size / HeapRegion::GrainBytes); |
| 342 | 2032 |
| 2033 // Create the gen rem set (and barrier set) for the entire reserved region. | |
| 2034 _rem_set = collector_policy()->create_rem_set(_reserved, 2); | |
| 2035 set_barrier_set(rem_set()->bs()); | |
| 2036 if (barrier_set()->is_a(BarrierSet::ModRef)) { | |
| 2037 _mr_bs = (ModRefBarrierSet*)_barrier_set; | |
| 2038 } else { | |
| 2039 vm_exit_during_initialization("G1 requires a mod ref bs."); | |
| 2040 return JNI_ENOMEM; | |
| 2041 } | |
| 2042 | |
| 2043 // Also create a G1 rem set. | |
| 1861 | 2044 if (mr_bs()->is_a(BarrierSet::CardTableModRef)) { |
| 2045 _g1_rem_set = new G1RemSet(this, (CardTableModRefBS*)mr_bs()); | |
| 342 | 2046 } else { |
| 1861 | 2047 vm_exit_during_initialization("G1 requires a cardtable mod ref bs."); |
| 2048 return JNI_ENOMEM; | |
| 342 | 2049 } |
| 2050 | |
| 2051 // Carve out the G1 part of the heap. | |
| 2052 | |
| 2053 ReservedSpace g1_rs = heap_rs.first_part(max_byte_size); | |
| 2054 _g1_reserved = MemRegion((HeapWord*)g1_rs.base(), | |
| 2055 g1_rs.size()/HeapWordSize); | |
| 2056 ReservedSpace perm_gen_rs = heap_rs.last_part(max_byte_size); | |
| 2057 | |
| 2058 _perm_gen = pgs->init(perm_gen_rs, pgs->init_size(), rem_set()); | |
| 2059 | |
| 2060 _g1_storage.initialize(g1_rs, 0); | |
| 2061 _g1_committed = MemRegion((HeapWord*)_g1_storage.low(), (size_t) 0); | |
| 3766 | 2062 _hrs.initialize((HeapWord*) _g1_reserved.start(), |
| 2063 (HeapWord*) _g1_reserved.end(), | |
| 2064 _expansion_regions); | |
| 342 | 2065 |
|
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2066 // 6843694 - ensure that the maximum region index can fit |
|
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2067 // in the remembered set structures. |
|
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2068 const uint max_region_idx = (1U << (sizeof(RegionIdx_t)*BitsPerByte-1)) - 1; |
|
807
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2069 guarantee((max_regions() - 1) <= max_region_idx, "too many regions"); |
|
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2070 |
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2071 size_t max_cards_per_region = ((size_t)1 << (sizeof(CardIdx_t)*BitsPerByte-1)) - 1; |
|
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2072 guarantee(HeapRegion::CardsPerRegion > 0, "make sure it's initialized"); |
|
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2073 guarantee(HeapRegion::CardsPerRegion < max_cards_per_region, |
|
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2074 "too many cards per region"); |
|
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2075 |
| 2152 | 2076 HeapRegionSet::set_unrealistically_long_length(max_regions() + 1); |
| 2077 | |
| 342 | 2078 _bot_shared = new G1BlockOffsetSharedArray(_reserved, |
| 2079 heap_word_size(init_byte_size)); | |
| 2080 | |
| 2081 _g1h = this; | |
| 2082 | |
|
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2083 _in_cset_fast_test_length = max_regions(); |
|
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2084 _in_cset_fast_test_base = |
|
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2085 NEW_C_HEAP_ARRAY(bool, (size_t) _in_cset_fast_test_length); |
|
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2086 |
|
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2087 // We're biasing _in_cset_fast_test to avoid subtracting the |
|
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2088 // beginning of the heap every time we want to index; basically |
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2089 // it's the same with what we do with the card table. |
|
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2090 _in_cset_fast_test = _in_cset_fast_test_base - |
|
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2091 ((uintx) _g1_reserved.start() >> HeapRegion::LogOfHRGrainBytes); |
|
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2092 |
|
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2093 // Clear the _cset_fast_test bitmap in anticipation of adding |
|
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2094 // regions to the incremental collection set for the first |
|
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2095 // evacuation pause. |
|
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2096 clear_cset_fast_test(); |
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2097 |
| 342 | 2098 // Create the ConcurrentMark data structure and thread. |
| 2099 // (Must do this late, so that "max_regions" is defined.) | |
|
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2100 _cm = new ConcurrentMark(heap_rs, max_regions()); |
| 342 | 2101 _cmThread = _cm->cmThread(); |
| 2102 | |
| 2103 // Initialize the from_card cache structure of HeapRegionRemSet. | |
| 2104 HeapRegionRemSet::init_heap(max_regions()); | |
| 2105 | |
| 677 | 2106 // Now expand into the initial heap size. |
|
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2107 if (!expand(init_byte_size)) { |
|
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2108 vm_exit_during_initialization("Failed to allocate initial heap."); |
|
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2109 return JNI_ENOMEM; |
|
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2110 } |
| 342 | 2111 |
| 2112 // Perform any initialization actions delegated to the policy. | |
| 2113 g1_policy()->init(); | |
| 2114 | |
| 2115 _refine_cte_cl = | |
| 2116 new RefineCardTableEntryClosure(ConcurrentG1RefineThread::sts(), | |
| 2117 g1_rem_set(), | |
| 2118 concurrent_g1_refine()); | |
| 2119 JavaThread::dirty_card_queue_set().set_closure(_refine_cte_cl); | |
| 2120 | |
| 2121 JavaThread::satb_mark_queue_set().initialize(SATB_Q_CBL_mon, | |
| 2122 SATB_Q_FL_lock, | |
| 1111 | 2123 G1SATBProcessCompletedThreshold, |
| 342 | 2124 Shared_SATB_Q_lock); |
| 794 | 2125 |
| 2126 JavaThread::dirty_card_queue_set().initialize(DirtyCardQ_CBL_mon, | |
| 2127 DirtyCardQ_FL_lock, | |
| 1111 | 2128 concurrent_g1_refine()->yellow_zone(), |
| 2129 concurrent_g1_refine()->red_zone(), | |
| 794 | 2130 Shared_DirtyCardQ_lock); |
| 2131 | |
|
616
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|
2132 if (G1DeferredRSUpdate) { |
|
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|
2133 dirty_card_queue_set().initialize(DirtyCardQ_CBL_mon, |
|
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|
2134 DirtyCardQ_FL_lock, |
| 1111 | 2135 -1, // never trigger processing |
| 2136 -1, // no limit on length | |
|
616
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|
2137 Shared_DirtyCardQ_lock, |
|
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|
2138 &JavaThread::dirty_card_queue_set()); |
|
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|
2139 } |
| 1705 | 2140 |
| 2141 // Initialize the card queue set used to hold cards containing | |
| 2142 // references into the collection set. | |
| 2143 _into_cset_dirty_card_queue_set.initialize(DirtyCardQ_CBL_mon, | |
| 2144 DirtyCardQ_FL_lock, | |
| 2145 -1, // never trigger processing | |
| 2146 -1, // no limit on length | |
| 2147 Shared_DirtyCardQ_lock, | |
| 2148 &JavaThread::dirty_card_queue_set()); | |
| 2149 | |
| 342 | 2150 // In case we're keeping closure specialization stats, initialize those |
| 2151 // counts and that mechanism. | |
| 2152 SpecializationStats::clear(); | |
| 2153 | |
| 2154 // Do later initialization work for concurrent refinement. | |
| 2155 _cg1r->init(); | |
| 2156 | |
|
2433
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|
2157 // Here we allocate the dummy full region that is required by the |
|
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|
2158 // G1AllocRegion class. If we don't pass an address in the reserved |
|
abdfc822206f
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|
2159 // space here, lots of asserts fire. |
| 3766 | 2160 |
| 2161 HeapRegion* dummy_region = new_heap_region(0 /* index of bottom region */, | |
| 2162 _g1_reserved.start()); | |
|
2433
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|
2163 // We'll re-use the same region whether the alloc region will |
|
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|
2164 // require BOT updates or not and, if it doesn't, then a non-young |
|
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|
2165 // region will complain that it cannot support allocations without |
|
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|
2166 // BOT updates. So we'll tag the dummy region as young to avoid that. |
|
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|
2167 dummy_region->set_young(); |
|
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|
2168 // Make sure it's full. |
|
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|
2169 dummy_region->set_top(dummy_region->end()); |
|
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|
2170 G1AllocRegion::setup(this, dummy_region); |
|
abdfc822206f
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|
2171 |
|
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|
2172 init_mutator_alloc_region(); |
|
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|
2173 |
|
3289
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|
2174 // Do create of the monitoring and management support so that |
|
b52782ae3880
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|
2175 // values in the heap have been properly initialized. |
|
3980
8229bd737950
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|
2176 _g1mm = new G1MonitoringSupport(this); |
|
3289
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|
2177 |
| 342 | 2178 return JNI_OK; |
| 2179 } | |
| 2180 | |
| 2181 void G1CollectedHeap::ref_processing_init() { | |
|
1974
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|
2182 // Reference processing in G1 currently works as follows: |
|
fd1d227ef1b9
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|
2183 // |
|
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|
2184 // * There are two reference processor instances. One is |
|
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|
2185 // used to record and process discovered references |
|
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|
2186 // during concurrent marking; the other is used to |
|
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|
2187 // record and process references during STW pauses |
|
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|
2188 // (both full and incremental). |
|
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|
2189 // * Both ref processors need to 'span' the entire heap as |
|
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|
2190 // the regions in the collection set may be dotted around. |
|
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|
2191 // |
|
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|
2192 // * For the concurrent marking ref processor: |
|
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|
2193 // * Reference discovery is enabled at initial marking. |
|
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|
2194 // * Reference discovery is disabled and the discovered |
|
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|
2195 // references processed etc during remarking. |
|
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|
2196 // * Reference discovery is MT (see below). |
|
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|
2197 // * Reference discovery requires a barrier (see below). |
|
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|
2198 // * Reference processing may or may not be MT |
|
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|
2199 // (depending on the value of ParallelRefProcEnabled |
|
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|
2200 // and ParallelGCThreads). |
|
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|
2201 // * A full GC disables reference discovery by the CM |
|
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|
2202 // ref processor and abandons any entries on it's |
|
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|
2203 // discovered lists. |
|
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|
2204 // |
|
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|
2205 // * For the STW processor: |
|
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|
2206 // * Non MT discovery is enabled at the start of a full GC. |
|
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|
2207 // * Processing and enqueueing during a full GC is non-MT. |
|
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|
2208 // * During a full GC, references are processed after marking. |
|
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|
2209 // |
|
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|
2210 // * Discovery (may or may not be MT) is enabled at the start |
|
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|
2211 // of an incremental evacuation pause. |
|
4dfb2df418f2
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changeset
|
2212 // * References are processed near the end of a STW evacuation pause. |
|
4dfb2df418f2
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3973
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|
2213 // * For both types of GC: |
|
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|
2214 // * Discovery is atomic - i.e. not concurrent. |
|
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|
2215 // * Reference discovery will not need a barrier. |
|
1974
fd1d227ef1b9
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diff
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|
2216 |
| 342 | 2217 SharedHeap::ref_processing_init(); |
| 2218 MemRegion mr = reserved_region(); | |
|
3979
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|
2219 |
|
4dfb2df418f2
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changeset
|
2220 // Concurrent Mark ref processor |
|
4dfb2df418f2
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diff
changeset
|
2221 _ref_processor_cm = |
|
2369
92da084fefc9
6668573: CMS: reference processing crash if ParallelCMSThreads > ParallelGCThreads
ysr
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2361
diff
changeset
|
2222 new ReferenceProcessor(mr, // span |
|
3979
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diff
changeset
|
2223 ParallelRefProcEnabled && (ParallelGCThreads > 1), |
|
4dfb2df418f2
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3973
diff
changeset
|
2224 // mt processing |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
2225 (int) ParallelGCThreads, |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
2226 // degree of mt processing |
|
4dfb2df418f2
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diff
changeset
|
2227 (ParallelGCThreads > 1) || (ConcGCThreads > 1), |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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parents:
3973
diff
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|
2228 // mt discovery |
|
4dfb2df418f2
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diff
changeset
|
2229 (int) MAX2(ParallelGCThreads, ConcGCThreads), |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
2230 // degree of mt discovery |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
2231 false, |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
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3973
diff
changeset
|
2232 // Reference discovery is not atomic |
|
4dfb2df418f2
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diff
changeset
|
2233 &_is_alive_closure_cm, |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
2234 // is alive closure |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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3973
diff
changeset
|
2235 // (for efficiency/performance) |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
2236 true); |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
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3973
diff
changeset
|
2237 // Setting next fields of discovered |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
2238 // lists requires a barrier. |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
2239 |
|
4dfb2df418f2
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parents:
3973
diff
changeset
|
2240 // STW ref processor |
|
4dfb2df418f2
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johnc
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3973
diff
changeset
|
2241 _ref_processor_stw = |
|
4dfb2df418f2
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johnc
parents:
3973
diff
changeset
|
2242 new ReferenceProcessor(mr, // span |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
2243 ParallelRefProcEnabled && (ParallelGCThreads > 1), |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
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|
2244 // mt processing |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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diff
changeset
|
2245 MAX2((int)ParallelGCThreads, 1), |
|
4dfb2df418f2
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diff
changeset
|
2246 // degree of mt processing |
|
4dfb2df418f2
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3973
diff
changeset
|
2247 (ParallelGCThreads > 1), |
|
4dfb2df418f2
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diff
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|
2248 // mt discovery |
|
4dfb2df418f2
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diff
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|
2249 MAX2((int)ParallelGCThreads, 1), |
|
4dfb2df418f2
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diff
changeset
|
2250 // degree of mt discovery |
|
4dfb2df418f2
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johnc
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3973
diff
changeset
|
2251 true, |
|
4dfb2df418f2
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diff
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|
2252 // Reference discovery is atomic |
|
4dfb2df418f2
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diff
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|
2253 &_is_alive_closure_stw, |
|
4dfb2df418f2
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diff
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|
2254 // is alive closure |
|
4dfb2df418f2
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diff
changeset
|
2255 // (for efficiency/performance) |
|
4dfb2df418f2
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diff
changeset
|
2256 false); |
|
4dfb2df418f2
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diff
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|
2257 // Setting next fields of discovered |
|
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|
2258 // lists requires a barrier. |
| 342 | 2259 } |
| 2260 | |
| 2261 size_t G1CollectedHeap::capacity() const { | |
| 2262 return _g1_committed.byte_size(); | |
| 2263 } | |
| 2264 | |
| 1705 | 2265 void G1CollectedHeap::iterate_dirty_card_closure(CardTableEntryClosure* cl, |
| 2266 DirtyCardQueue* into_cset_dcq, | |
| 2267 bool concurrent, | |
| 342 | 2268 int worker_i) { |
| 889 | 2269 // Clean cards in the hot card cache |
| 1705 | 2270 concurrent_g1_refine()->clean_up_cache(worker_i, g1_rem_set(), into_cset_dcq); |
| 889 | 2271 |
| 342 | 2272 DirtyCardQueueSet& dcqs = JavaThread::dirty_card_queue_set(); |
| 2273 int n_completed_buffers = 0; | |
| 1705 | 2274 while (dcqs.apply_closure_to_completed_buffer(cl, worker_i, 0, true)) { |
| 342 | 2275 n_completed_buffers++; |
| 2276 } | |
| 2277 g1_policy()->record_update_rs_processed_buffers(worker_i, | |
| 2278 (double) n_completed_buffers); | |
| 2279 dcqs.clear_n_completed_buffers(); | |
| 2280 assert(!dcqs.completed_buffers_exist_dirty(), "Completed buffers exist!"); | |
| 2281 } | |
| 2282 | |
| 2283 | |
| 2284 // Computes the sum of the storage used by the various regions. | |
| 2285 | |
| 2286 size_t G1CollectedHeap::used() const { | |
|
862
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ysr
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861
diff
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|
2287 assert(Heap_lock->owner() != NULL, |
|
36b5611220a7
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861
diff
changeset
|
2288 "Should be owned on this thread's behalf."); |
| 342 | 2289 size_t result = _summary_bytes_used; |
|
845
df6caf649ff7
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838
diff
changeset
|
2290 // Read only once in case it is set to NULL concurrently |
|
2433
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|
2291 HeapRegion* hr = _mutator_alloc_region.get(); |
|
845
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|
2292 if (hr != NULL) |
|
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diff
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|
2293 result += hr->used(); |
| 342 | 2294 return result; |
| 2295 } | |
| 2296 | |
|
846
42d84bbbecf4
6859911: G1: assert(Heap_lock->owner() = NULL, "Should be owned on this thread's behalf")
tonyp
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845
diff
changeset
|
2297 size_t G1CollectedHeap::used_unlocked() const { |
|
42d84bbbecf4
6859911: G1: assert(Heap_lock->owner() = NULL, "Should be owned on this thread's behalf")
tonyp
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diff
changeset
|
2298 size_t result = _summary_bytes_used; |
|
42d84bbbecf4
6859911: G1: assert(Heap_lock->owner() = NULL, "Should be owned on this thread's behalf")
tonyp
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845
diff
changeset
|
2299 return result; |
|
42d84bbbecf4
6859911: G1: assert(Heap_lock->owner() = NULL, "Should be owned on this thread's behalf")
tonyp
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845
diff
changeset
|
2300 } |
|
42d84bbbecf4
6859911: G1: assert(Heap_lock->owner() = NULL, "Should be owned on this thread's behalf")
tonyp
parents:
845
diff
changeset
|
2301 |
| 342 | 2302 class SumUsedClosure: public HeapRegionClosure { |
| 2303 size_t _used; | |
| 2304 public: | |
| 2305 SumUsedClosure() : _used(0) {} | |
| 2306 bool doHeapRegion(HeapRegion* r) { | |
| 2307 if (!r->continuesHumongous()) { | |
| 2308 _used += r->used(); | |
| 2309 } | |
| 2310 return false; | |
| 2311 } | |
| 2312 size_t result() { return _used; } | |
| 2313 }; | |
| 2314 | |
| 2315 size_t G1CollectedHeap::recalculate_used() const { | |
| 2316 SumUsedClosure blk; | |
| 3766 | 2317 heap_region_iterate(&blk); |
| 342 | 2318 return blk.result(); |
| 2319 } | |
| 2320 | |
| 2321 size_t G1CollectedHeap::unsafe_max_alloc() { | |
| 2152 | 2322 if (free_regions() > 0) return HeapRegion::GrainBytes; |
| 342 | 2323 // otherwise, is there space in the current allocation region? |
| 2324 | |
| 2325 // We need to store the current allocation region in a local variable | |
| 2326 // here. The problem is that this method doesn't take any locks and | |
| 2327 // there may be other threads which overwrite the current allocation | |
| 2328 // region field. attempt_allocation(), for example, sets it to NULL | |
| 2329 // and this can happen *after* the NULL check here but before the call | |
| 2330 // to free(), resulting in a SIGSEGV. Note that this doesn't appear | |
| 2331 // to be a problem in the optimized build, since the two loads of the | |
| 2332 // current allocation region field are optimized away. | |
|
2433
abdfc822206f
7023069: G1: Introduce symmetric locking in the slow allocation path
tonyp
parents:
2432
diff
changeset
|
2333 HeapRegion* hr = _mutator_alloc_region.get(); |
|
abdfc822206f
7023069: G1: Introduce symmetric locking in the slow allocation path
tonyp
parents:
2432
diff
changeset
|
2334 if (hr == NULL) { |
| 342 | 2335 return 0; |
| 2336 } | |
|
2433
abdfc822206f
7023069: G1: Introduce symmetric locking in the slow allocation path
tonyp
parents:
2432
diff
changeset
|
2337 return hr->free(); |
| 342 | 2338 } |
| 2339 | |
|
1656
4e5661ba9d98
6944166: G1: explicit GCs are not always handled correctly
tonyp
parents:
1611
diff
changeset
|
2340 bool G1CollectedHeap::should_do_concurrent_full_gc(GCCause::Cause cause) { |
|
4910
caa4652b4414
7129892: G1: explicit marking cycle initiation might fail to initiate a marking cycle
tonyp
parents:
4875
diff
changeset
|
2341 switch (cause) { |
|
caa4652b4414
7129892: G1: explicit marking cycle initiation might fail to initiate a marking cycle
tonyp
parents:
4875
diff
changeset
|
2342 case GCCause::_gc_locker: return GCLockerInvokesConcurrent; |
|
caa4652b4414
7129892: G1: explicit marking cycle initiation might fail to initiate a marking cycle
tonyp
parents:
4875
diff
changeset
|
2343 case GCCause::_java_lang_system_gc: return ExplicitGCInvokesConcurrent; |
|
caa4652b4414
7129892: G1: explicit marking cycle initiation might fail to initiate a marking cycle
tonyp
parents:
4875
diff
changeset
|
2344 case GCCause::_g1_humongous_allocation: return true; |
|
caa4652b4414
7129892: G1: explicit marking cycle initiation might fail to initiate a marking cycle
tonyp
parents:
4875
diff
changeset
|
2345 default: return false; |
|
caa4652b4414
7129892: G1: explicit marking cycle initiation might fail to initiate a marking cycle
tonyp
parents:
4875
diff
changeset
|
2346 } |
|
1656
4e5661ba9d98
6944166: G1: explicit GCs are not always handled correctly
tonyp
parents:
1611
diff
changeset
|
2347 } |
|
4e5661ba9d98
6944166: G1: explicit GCs are not always handled correctly
tonyp
parents:
1611
diff
changeset
|
2348 |
|
3285
49a67202bc67
7011855: G1: non-product flag to artificially grow the heap
tonyp
parents:
2433
diff
changeset
|
2349 #ifndef PRODUCT |
|
49a67202bc67
7011855: G1: non-product flag to artificially grow the heap
tonyp
parents:
2433
diff
changeset
|
2350 void G1CollectedHeap::allocate_dummy_regions() { |
|
49a67202bc67
7011855: G1: non-product flag to artificially grow the heap
tonyp
parents:
2433
diff
changeset
|
2351 // Let's fill up most of the region |
|
49a67202bc67
7011855: G1: non-product flag to artificially grow the heap
tonyp
parents:
2433
diff
changeset
|
2352 size_t word_size = HeapRegion::GrainWords - 1024; |
|
49a67202bc67
7011855: G1: non-product flag to artificially grow the heap
tonyp
parents:
2433
diff
changeset
|
2353 // 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
|
2354 guarantee(isHumongous(word_size), "sanity"); |
|
49a67202bc67
7011855: G1: non-product flag to artificially grow the heap
tonyp
parents:
2433
diff
changeset
|
2355 |
|
49a67202bc67
7011855: G1: non-product flag to artificially grow the heap
tonyp
parents:
2433
diff
changeset
|
2356 for (uintx i = 0; i < G1DummyRegionsPerGC; ++i) { |
|
49a67202bc67
7011855: G1: non-product flag to artificially grow the heap
tonyp
parents:
2433
diff
changeset
|
2357 // 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
|
2358 HeapWord* dummy_obj = humongous_obj_allocate(word_size); |
|
49a67202bc67
7011855: G1: non-product flag to artificially grow the heap
tonyp
parents:
2433
diff
changeset
|
2359 if (dummy_obj != NULL) { |
|
49a67202bc67
7011855: G1: non-product flag to artificially grow the heap
tonyp
parents:
2433
diff
changeset
|
2360 MemRegion mr(dummy_obj, word_size); |
|
49a67202bc67
7011855: G1: non-product flag to artificially grow the heap
tonyp
parents:
2433
diff
changeset
|
2361 CollectedHeap::fill_with_object(mr); |
|
49a67202bc67
7011855: G1: non-product flag to artificially grow the heap
tonyp
parents:
2433
diff
changeset
|
2362 } else { |
|
49a67202bc67
7011855: G1: non-product flag to artificially grow the heap
tonyp
parents:
2433
diff
changeset
|
2363 // 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
|
2364 // again. Let's get out of the loop. |
|
49a67202bc67
7011855: G1: non-product flag to artificially grow the heap
tonyp
parents:
2433
diff
changeset
|
2365 break; |
|
49a67202bc67
7011855: G1: non-product flag to artificially grow the heap
tonyp
parents:
2433
diff
changeset
|
2366 } |
|
49a67202bc67
7011855: G1: non-product flag to artificially grow the heap
tonyp
parents:
2433
diff
changeset
|
2367 } |
|
49a67202bc67
7011855: G1: non-product flag to artificially grow the heap
tonyp
parents:
2433
diff
changeset
|
2368 } |
|
49a67202bc67
7011855: G1: non-product flag to artificially grow the heap
tonyp
parents:
2433
diff
changeset
|
2369 #endif // !PRODUCT |
|
49a67202bc67
7011855: G1: non-product flag to artificially grow the heap
tonyp
parents:
2433
diff
changeset
|
2370 |
|
6120
37552638d24a
7172388: G1: _total_full_collections should not be incremented for concurrent cycles
brutisso
parents:
6109
diff
changeset
|
2371 void G1CollectedHeap::increment_old_marking_cycles_started() { |
|
37552638d24a
7172388: G1: _total_full_collections should not be incremented for concurrent cycles
brutisso
parents:
6109
diff
changeset
|
2372 assert(_old_marking_cycles_started == _old_marking_cycles_completed || |
|
37552638d24a
7172388: G1: _total_full_collections should not be incremented for concurrent cycles
brutisso
parents:
6109
diff
changeset
|
2373 _old_marking_cycles_started == _old_marking_cycles_completed + 1, |
|
37552638d24a
7172388: G1: _total_full_collections should not be incremented for concurrent cycles
brutisso
parents:
6109
diff
changeset
|
2374 err_msg("Wrong marking cycle count (started: %d, completed: %d)", |
|
37552638d24a
7172388: G1: _total_full_collections should not be incremented for concurrent cycles
brutisso
parents:
6109
diff
changeset
|
2375 _old_marking_cycles_started, _old_marking_cycles_completed)); |
|
37552638d24a
7172388: G1: _total_full_collections should not be incremented for concurrent cycles
brutisso
parents:
6109
diff
changeset
|
2376 |
|
37552638d24a
7172388: G1: _total_full_collections should not be incremented for concurrent cycles
brutisso
parents:
6109
diff
changeset
|
2377 _old_marking_cycles_started++; |
|
37552638d24a
7172388: G1: _total_full_collections should not be incremented for concurrent cycles
brutisso
parents:
6109
diff
changeset
|
2378 } |
|
37552638d24a
7172388: G1: _total_full_collections should not be incremented for concurrent cycles
brutisso
parents:
6109
diff
changeset
|
2379 |
|
37552638d24a
7172388: G1: _total_full_collections should not be incremented for concurrent cycles
brutisso
parents:
6109
diff
changeset
|
2380 void G1CollectedHeap::increment_old_marking_cycles_completed(bool concurrent) { |
|
1656
4e5661ba9d98
6944166: G1: explicit GCs are not always handled correctly
tonyp
parents:
1611
diff
changeset
|
2381 MonitorLockerEx x(FullGCCount_lock, Mutex::_no_safepoint_check_flag); |
|
4e5661ba9d98
6944166: G1: explicit GCs are not always handled correctly
tonyp
parents:
1611
diff
changeset
|
2382 |
|
2030
fb712ff22571
7000559: G1: assertion failure !outer || (full_collections_started == _full_collections_completed + 1)
tonyp
parents:
1995
diff
changeset
|
2383 // 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
|
2384 // 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
|
2385 // 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
|
2386 // assert here. |
|
fb712ff22571
7000559: G1: assertion failure !outer || (full_collections_started == _full_collections_completed + 1)
tonyp
parents:
1995
diff
changeset
|
2387 |
|
1656
4e5661ba9d98
6944166: G1: explicit GCs are not always handled correctly
tonyp
parents:
1611
diff
changeset
|
2388 // 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
|
2389 // 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
|
2390 // interrupt a concurrent cycle), the number of full collections |
|
4e5661ba9d98
6944166: G1: explicit GCs are not always handled correctly
tonyp
parents:
1611
diff
changeset
|
2391 // 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
|
2392 // 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
|
2393 // behind the number of full collections started. |
|
4e5661ba9d98
6944166: G1: explicit GCs are not always handled correctly
tonyp
parents:
1611
diff
changeset
|
2394 |
|
4e5661ba9d98
6944166: G1: explicit GCs are not always handled correctly
tonyp
parents:
1611
diff
changeset
|
2395 // 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
|
2396 assert(concurrent || |
|
6120
37552638d24a
7172388: G1: _total_full_collections should not be incremented for concurrent cycles
brutisso
parents:
6109
diff
changeset
|
2397 (_old_marking_cycles_started == _old_marking_cycles_completed + 1) || |
|
37552638d24a
7172388: G1: _total_full_collections should not be incremented for concurrent cycles
brutisso
parents:
6109
diff
changeset
|
2398 (_old_marking_cycles_started == _old_marking_cycles_completed + 2), |
|
37552638d24a
7172388: G1: _total_full_collections should not be incremented for concurrent cycles
brutisso
parents:
6109
diff
changeset
|
2399 err_msg("for inner caller (Full GC): _old_marking_cycles_started = %u " |
|
37552638d24a
7172388: G1: _total_full_collections should not be incremented for concurrent cycles
brutisso
parents:
6109
diff
changeset
|
2400 "is inconsistent with _old_marking_cycles_completed = %u", |
|
37552638d24a
7172388: G1: _total_full_collections should not be incremented for concurrent cycles
brutisso
parents:
6109
diff
changeset
|
2401 _old_marking_cycles_started, _old_marking_cycles_completed)); |
|
1656
4e5661ba9d98
6944166: G1: explicit GCs are not always handled correctly
tonyp
parents:
1611
diff
changeset
|
2402 |
|
4e5661ba9d98
6944166: G1: explicit GCs are not always handled correctly
tonyp
parents:
1611
diff
changeset
|
2403 // 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
|
2404 assert(!concurrent || |
|
6120
37552638d24a
7172388: G1: _total_full_collections should not be incremented for concurrent cycles
brutisso
parents:
6109
diff
changeset
|
2405 (_old_marking_cycles_started == _old_marking_cycles_completed + 1), |
|
2030
fb712ff22571
7000559: G1: assertion failure !outer || (full_collections_started == _full_collections_completed + 1)
tonyp
parents:
1995
diff
changeset
|
2406 err_msg("for outer caller (concurrent cycle): " |
|
6120
37552638d24a
7172388: G1: _total_full_collections should not be incremented for concurrent cycles
brutisso
parents:
6109
diff
changeset
|
2407 "_old_marking_cycles_started = %u " |
|
37552638d24a
7172388: G1: _total_full_collections should not be incremented for concurrent cycles
brutisso
parents:
6109
diff
changeset
|
2408 "is inconsistent with _old_marking_cycles_completed = %u", |
|
37552638d24a
7172388: G1: _total_full_collections should not be incremented for concurrent cycles
brutisso
parents:
6109
diff
changeset
|
2409 _old_marking_cycles_started, _old_marking_cycles_completed)); |
|
37552638d24a
7172388: G1: _total_full_collections should not be incremented for concurrent cycles
brutisso
parents:
6109
diff
changeset
|
2410 |
|
37552638d24a
7172388: G1: _total_full_collections should not be incremented for concurrent cycles
brutisso
parents:
6109
diff
changeset
|
2411 _old_marking_cycles_completed += 1; |
|
1656
4e5661ba9d98
6944166: G1: explicit GCs are not always handled correctly
tonyp
parents:
1611
diff
changeset
|
2412 |
|
1840
4e0094bc41fa
6983311: G1: LoopTest hangs when run with -XX:+ExplicitInvokesConcurrent
johnc
parents:
1833
diff
changeset
|
2413 // 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
|
2414 // we wake up any waiters (especially when ExplicitInvokesConcurrent |
|
4e0094bc41fa
6983311: G1: LoopTest hangs when run with -XX:+ExplicitInvokesConcurrent
johnc
parents:
1833
diff
changeset
|
2415 // 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
|
2416 // 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
|
2417 if (concurrent) { |
|
1840
4e0094bc41fa
6983311: G1: LoopTest hangs when run with -XX:+ExplicitInvokesConcurrent
johnc
parents:
1833
diff
changeset
|
2418 _cmThread->clear_in_progress(); |
|
4e0094bc41fa
6983311: G1: LoopTest hangs when run with -XX:+ExplicitInvokesConcurrent
johnc
parents:
1833
diff
changeset
|
2419 } |
|
4e0094bc41fa
6983311: G1: LoopTest hangs when run with -XX:+ExplicitInvokesConcurrent
johnc
parents:
1833
diff
changeset
|
2420 |
|
1656
4e5661ba9d98
6944166: G1: explicit GCs are not always handled correctly
tonyp
parents:
1611
diff
changeset
|
2421 // 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
|
2422 // System.gc() with (with ExplicitGCInvokesConcurrent set or not) |
|
4e5661ba9d98
6944166: G1: explicit GCs are not always handled correctly
tonyp
parents:
1611
diff
changeset
|
2423 // 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
|
2424 // waiting in VM_G1IncCollectionPause::doit_epilogue(). |
|
4e5661ba9d98
6944166: G1: explicit GCs are not always handled correctly
tonyp
parents:
1611
diff
changeset
|
2425 FullGCCount_lock->notify_all(); |
|
4e5661ba9d98
6944166: G1: explicit GCs are not always handled correctly
tonyp
parents:
1611
diff
changeset
|
2426 } |
|
4e5661ba9d98
6944166: G1: explicit GCs are not always handled correctly
tonyp
parents:
1611
diff
changeset
|
2427 |
| 342 | 2428 void G1CollectedHeap::collect_as_vm_thread(GCCause::Cause cause) { |
| 2152 | 2429 assert_at_safepoint(true /* should_be_vm_thread */); |
| 342 | 2430 GCCauseSetter gcs(this, cause); |
| 2431 switch (cause) { | |
| 2432 case GCCause::_heap_inspection: | |
| 2433 case GCCause::_heap_dump: { | |
| 2434 HandleMark hm; | |
| 2435 do_full_collection(false); // don't clear all soft refs | |
| 2436 break; | |
| 2437 } | |
| 2438 default: // XXX FIX ME | |
| 2439 ShouldNotReachHere(); // Unexpected use of this function | |
| 2440 } | |
| 2441 } | |
| 2442 | |
|
1088
3fc996d4edd2
6902303: G1: ScavengeALot should cause an incremental, rather than a full, collection
ysr
parents:
1045
diff
changeset
|
2443 void G1CollectedHeap::collect(GCCause::Cause cause) { |
|
4910
caa4652b4414
7129892: G1: explicit marking cycle initiation might fail to initiate a marking cycle
tonyp
parents:
4875
diff
changeset
|
2444 assert_heap_not_locked(); |
|
1088
3fc996d4edd2
6902303: G1: ScavengeALot should cause an incremental, rather than a full, collection
ysr
parents:
1045
diff
changeset
|
2445 |
|
1656
4e5661ba9d98
6944166: G1: explicit GCs are not always handled correctly
tonyp
parents:
1611
diff
changeset
|
2446 unsigned int gc_count_before; |
|
6120
37552638d24a
7172388: G1: _total_full_collections should not be incremented for concurrent cycles
brutisso
parents:
6109
diff
changeset
|
2447 unsigned int old_marking_count_before; |
|
4910
caa4652b4414
7129892: G1: explicit marking cycle initiation might fail to initiate a marking cycle
tonyp
parents:
4875
diff
changeset
|
2448 bool retry_gc; |
|
caa4652b4414
7129892: G1: explicit marking cycle initiation might fail to initiate a marking cycle
tonyp
parents:
4875
diff
changeset
|
2449 |
|
caa4652b4414
7129892: G1: explicit marking cycle initiation might fail to initiate a marking cycle
tonyp
parents:
4875
diff
changeset
|
2450 do { |
|
caa4652b4414
7129892: G1: explicit marking cycle initiation might fail to initiate a marking cycle
tonyp
parents:
4875
diff
changeset
|
2451 retry_gc = false; |
|
caa4652b4414
7129892: G1: explicit marking cycle initiation might fail to initiate a marking cycle
tonyp
parents:
4875
diff
changeset
|
2452 |
|
caa4652b4414
7129892: G1: explicit marking cycle initiation might fail to initiate a marking cycle
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2453 { |
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2454 MutexLocker ml(Heap_lock); |
|
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2455 |
|
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2456 // Read the GC count while holding the Heap_lock |
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2457 gc_count_before = total_collections(); |
|
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2458 old_marking_count_before = _old_marking_cycles_started; |
|
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2459 } |
|
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2460 |
|
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2461 if (should_do_concurrent_full_gc(cause)) { |
|
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2462 // Schedule an initial-mark evacuation pause that will start a |
|
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2463 // concurrent cycle. We're setting word_size to 0 which means that |
|
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2464 // we are not requesting a post-GC allocation. |
|
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2465 VM_G1IncCollectionPause op(gc_count_before, |
| 1973 | 2466 0, /* word_size */ |
|
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2467 true, /* should_initiate_conc_mark */ |
|
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2468 g1_policy()->max_pause_time_ms(), |
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2469 cause); |
|
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2470 |
|
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2471 VMThread::execute(&op); |
|
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2472 if (!op.pause_succeeded()) { |
|
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2473 if (old_marking_count_before == _old_marking_cycles_started) { |
|
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2474 retry_gc = op.should_retry_gc(); |
|
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2475 } else { |
|
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2476 // A Full GC happened while we were trying to schedule the |
|
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2477 // initial-mark GC. No point in starting a new cycle given |
|
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2478 // that the whole heap was collected anyway. |
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2479 } |
|
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2480 |
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2481 if (retry_gc) { |
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2482 if (GC_locker::is_active_and_needs_gc()) { |
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2483 GC_locker::stall_until_clear(); |
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2484 } |
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2485 } |
|
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2486 } |
|
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2487 } else { |
|
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2488 if (cause == GCCause::_gc_locker |
|
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2489 DEBUG_ONLY(|| cause == GCCause::_scavenge_alot)) { |
|
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2490 |
|
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2491 // Schedule a standard evacuation pause. We're setting word_size |
|
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2492 // to 0 which means that we are not requesting a post-GC allocation. |
|
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2493 VM_G1IncCollectionPause op(gc_count_before, |
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2494 0, /* word_size */ |
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2495 false, /* should_initiate_conc_mark */ |
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2496 g1_policy()->max_pause_time_ms(), |
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2497 cause); |
|
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2498 VMThread::execute(&op); |
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2499 } else { |
|
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2500 // Schedule a Full GC. |
|
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2501 VM_G1CollectFull op(gc_count_before, old_marking_count_before, cause); |
|
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2502 VMThread::execute(&op); |
|
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2503 } |
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2504 } |
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|
2505 } while (retry_gc); |
| 342 | 2506 } |
| 2507 | |
| 2508 bool G1CollectedHeap::is_in(const void* p) const { | |
| 4708 | 2509 if (_g1_committed.contains(p)) { |
| 2510 // Given that we know that p is in the committed space, | |
| 2511 // heap_region_containing_raw() should successfully | |
| 2512 // return the containing region. | |
| 2513 HeapRegion* hr = heap_region_containing_raw(p); | |
| 342 | 2514 return hr->is_in(p); |
| 2515 } else { | |
| 2516 return _perm_gen->as_gen()->is_in(p); | |
| 2517 } | |
| 2518 } | |
| 2519 | |
| 2520 // Iteration functions. | |
| 2521 | |
| 2522 // Iterates an OopClosure over all ref-containing fields of objects | |
| 2523 // within a HeapRegion. | |
| 2524 | |
| 2525 class IterateOopClosureRegionClosure: public HeapRegionClosure { | |
| 2526 MemRegion _mr; | |
| 2527 OopClosure* _cl; | |
| 2528 public: | |
| 2529 IterateOopClosureRegionClosure(MemRegion mr, OopClosure* cl) | |
| 2530 : _mr(mr), _cl(cl) {} | |
| 2531 bool doHeapRegion(HeapRegion* r) { | |
| 2532 if (! r->continuesHumongous()) { | |
| 2533 r->oop_iterate(_cl); | |
| 2534 } | |
| 2535 return false; | |
| 2536 } | |
| 2537 }; | |
| 2538 | |
| 678 | 2539 void G1CollectedHeap::oop_iterate(OopClosure* cl, bool do_perm) { |
| 342 | 2540 IterateOopClosureRegionClosure blk(_g1_committed, cl); |
| 3766 | 2541 heap_region_iterate(&blk); |
| 678 | 2542 if (do_perm) { |
| 2543 perm_gen()->oop_iterate(cl); | |
| 2544 } | |
| 342 | 2545 } |
| 2546 | |
| 678 | 2547 void G1CollectedHeap::oop_iterate(MemRegion mr, OopClosure* cl, bool do_perm) { |
| 342 | 2548 IterateOopClosureRegionClosure blk(mr, cl); |
| 3766 | 2549 heap_region_iterate(&blk); |
| 678 | 2550 if (do_perm) { |
| 2551 perm_gen()->oop_iterate(cl); | |
| 2552 } | |
| 342 | 2553 } |
| 2554 | |
| 2555 // Iterates an ObjectClosure over all objects within a HeapRegion. | |
| 2556 | |
| 2557 class IterateObjectClosureRegionClosure: public HeapRegionClosure { | |
| 2558 ObjectClosure* _cl; | |
| 2559 public: | |
| 2560 IterateObjectClosureRegionClosure(ObjectClosure* cl) : _cl(cl) {} | |
| 2561 bool doHeapRegion(HeapRegion* r) { | |
| 2562 if (! r->continuesHumongous()) { | |
| 2563 r->object_iterate(_cl); | |
| 2564 } | |
| 2565 return false; | |
| 2566 } | |
| 2567 }; | |
| 2568 | |
| 678 | 2569 void G1CollectedHeap::object_iterate(ObjectClosure* cl, bool do_perm) { |
| 342 | 2570 IterateObjectClosureRegionClosure blk(cl); |
| 3766 | 2571 heap_region_iterate(&blk); |
| 678 | 2572 if (do_perm) { |
| 2573 perm_gen()->object_iterate(cl); | |
| 2574 } | |
| 342 | 2575 } |
| 2576 | |
| 2577 void G1CollectedHeap::object_iterate_since_last_GC(ObjectClosure* cl) { | |
| 2578 // FIXME: is this right? | |
| 2579 guarantee(false, "object_iterate_since_last_GC not supported by G1 heap"); | |
| 2580 } | |
| 2581 | |
| 2582 // Calls a SpaceClosure on a HeapRegion. | |
| 2583 | |
| 2584 class SpaceClosureRegionClosure: public HeapRegionClosure { | |
| 2585 SpaceClosure* _cl; | |
| 2586 public: | |
| 2587 SpaceClosureRegionClosure(SpaceClosure* cl) : _cl(cl) {} | |
| 2588 bool doHeapRegion(HeapRegion* r) { | |
| 2589 _cl->do_space(r); | |
| 2590 return false; | |
| 2591 } | |
| 2592 }; | |
| 2593 | |
| 2594 void G1CollectedHeap::space_iterate(SpaceClosure* cl) { | |
| 2595 SpaceClosureRegionClosure blk(cl); | |
| 3766 | 2596 heap_region_iterate(&blk); |
| 342 | 2597 } |
| 2598 | |
| 3766 | 2599 void G1CollectedHeap::heap_region_iterate(HeapRegionClosure* cl) const { |
| 2600 _hrs.iterate(cl); | |
| 342 | 2601 } |
| 2602 | |
| 2603 void G1CollectedHeap::heap_region_iterate_from(HeapRegion* r, | |
| 3766 | 2604 HeapRegionClosure* cl) const { |
| 2605 _hrs.iterate_from(r, cl); | |
| 342 | 2606 } |
| 2607 | |
| 2608 void | |
| 2609 G1CollectedHeap::heap_region_par_iterate_chunked(HeapRegionClosure* cl, | |
|
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2610 uint worker, |
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2611 uint no_of_par_workers, |
| 342 | 2612 jint claim_value) { |
|
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2613 const uint regions = n_regions(); |
|
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2614 const uint max_workers = (G1CollectedHeap::use_parallel_gc_threads() ? |
|
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2615 no_of_par_workers : |
|
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2616 1); |
|
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2617 assert(UseDynamicNumberOfGCThreads || |
|
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2618 no_of_par_workers == workers()->total_workers(), |
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2619 "Non dynamic should use fixed number of workers"); |
| 355 | 2620 // try to spread out the starting points of the workers |
|
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2621 const uint start_index = regions / max_workers * worker; |
| 355 | 2622 |
| 2623 // each worker will actually look at all regions | |
|
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2624 for (uint count = 0; count < regions; ++count) { |
|
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2625 const uint index = (start_index + count) % regions; |
| 355 | 2626 assert(0 <= index && index < regions, "sanity"); |
| 2627 HeapRegion* r = region_at(index); | |
| 2628 // we'll ignore "continues humongous" regions (we'll process them | |
| 2629 // when we come across their corresponding "start humongous" | |
| 2630 // region) and regions already claimed | |
| 2631 if (r->claim_value() == claim_value || r->continuesHumongous()) { | |
| 2632 continue; | |
| 2633 } | |
| 2634 // OK, try to claim it | |
| 342 | 2635 if (r->claimHeapRegion(claim_value)) { |
| 355 | 2636 // success! |
| 2637 assert(!r->continuesHumongous(), "sanity"); | |
| 2638 if (r->startsHumongous()) { | |
| 2639 // If the region is "starts humongous" we'll iterate over its | |
| 2640 // "continues humongous" first; in fact we'll do them | |
| 2641 // first. The order is important. In on case, calling the | |
| 2642 // closure on the "starts humongous" region might de-allocate | |
| 2643 // and clear all its "continues humongous" regions and, as a | |
| 2644 // result, we might end up processing them twice. So, we'll do | |
| 2645 // them first (notice: most closures will ignore them anyway) and | |
| 2646 // then we'll do the "starts humongous" region. | |
|
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2647 for (uint ch_index = index + 1; ch_index < regions; ++ch_index) { |
| 355 | 2648 HeapRegion* chr = region_at(ch_index); |
| 2649 | |
| 2650 // if the region has already been claimed or it's not | |
| 2651 // "continues humongous" we're done | |
| 2652 if (chr->claim_value() == claim_value || | |
| 2653 !chr->continuesHumongous()) { | |
| 2654 break; | |
| 2655 } | |
| 2656 | |
| 2657 // Noone should have claimed it directly. We can given | |
| 2658 // that we claimed its "starts humongous" region. | |
| 2659 assert(chr->claim_value() != claim_value, "sanity"); | |
| 2660 assert(chr->humongous_start_region() == r, "sanity"); | |
| 2661 | |
| 2662 if (chr->claimHeapRegion(claim_value)) { | |
| 2663 // we should always be able to claim it; noone else should | |
| 2664 // be trying to claim this region | |
| 2665 | |
| 2666 bool res2 = cl->doHeapRegion(chr); | |
| 2667 assert(!res2, "Should not abort"); | |
| 2668 | |
| 2669 // Right now, this holds (i.e., no closure that actually | |
| 2670 // does something with "continues humongous" regions | |
| 2671 // clears them). We might have to weaken it in the future, | |
| 2672 // but let's leave these two asserts here for extra safety. | |
| 2673 assert(chr->continuesHumongous(), "should still be the case"); | |
| 2674 assert(chr->humongous_start_region() == r, "sanity"); | |
| 2675 } else { | |
| 2676 guarantee(false, "we should not reach here"); | |
| 2677 } | |
| 2678 } | |
| 2679 } | |
| 2680 | |
| 2681 assert(!r->continuesHumongous(), "sanity"); | |
| 2682 bool res = cl->doHeapRegion(r); | |
| 2683 assert(!res, "Should not abort"); | |
| 2684 } | |
| 2685 } | |
| 2686 } | |
| 2687 | |
| 390 | 2688 class ResetClaimValuesClosure: public HeapRegionClosure { |
| 2689 public: | |
| 2690 bool doHeapRegion(HeapRegion* r) { | |
| 2691 r->set_claim_value(HeapRegion::InitialClaimValue); | |
| 2692 return false; | |
| 2693 } | |
| 2694 }; | |
| 2695 | |
|
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2696 void G1CollectedHeap::reset_heap_region_claim_values() { |
| 390 | 2697 ResetClaimValuesClosure blk; |
| 2698 heap_region_iterate(&blk); | |
| 2699 } | |
| 2700 | |
|
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2701 void G1CollectedHeap::reset_cset_heap_region_claim_values() { |
|
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2702 ResetClaimValuesClosure blk; |
|
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2703 collection_set_iterate(&blk); |
|
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2704 } |
|
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2705 |
| 355 | 2706 #ifdef ASSERT |
| 2707 // This checks whether all regions in the heap have the correct claim | |
| 2708 // value. I also piggy-backed on this a check to ensure that the | |
| 2709 // humongous_start_region() information on "continues humongous" | |
| 2710 // regions is correct. | |
| 2711 | |
| 2712 class CheckClaimValuesClosure : public HeapRegionClosure { | |
| 2713 private: | |
| 2714 jint _claim_value; | |
|
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2715 uint _failures; |
| 355 | 2716 HeapRegion* _sh_region; |
|
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2717 |
| 355 | 2718 public: |
| 2719 CheckClaimValuesClosure(jint claim_value) : | |
| 2720 _claim_value(claim_value), _failures(0), _sh_region(NULL) { } | |
| 2721 bool doHeapRegion(HeapRegion* r) { | |
| 2722 if (r->claim_value() != _claim_value) { | |
|
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2723 gclog_or_tty->print_cr("Region " HR_FORMAT ", " |
| 355 | 2724 "claim value = %d, should be %d", |
|
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2725 HR_FORMAT_PARAMS(r), |
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|
2726 r->claim_value(), _claim_value); |
| 355 | 2727 ++_failures; |
| 2728 } | |
| 2729 if (!r->isHumongous()) { | |
| 2730 _sh_region = NULL; | |
| 2731 } else if (r->startsHumongous()) { | |
| 2732 _sh_region = r; | |
| 2733 } else if (r->continuesHumongous()) { | |
| 2734 if (r->humongous_start_region() != _sh_region) { | |
|
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|
2735 gclog_or_tty->print_cr("Region " HR_FORMAT ", " |
| 355 | 2736 "HS = "PTR_FORMAT", should be "PTR_FORMAT, |
|
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|
2737 HR_FORMAT_PARAMS(r), |
| 355 | 2738 r->humongous_start_region(), |
| 2739 _sh_region); | |
| 2740 ++_failures; | |
| 342 | 2741 } |
| 2742 } | |
| 355 | 2743 return false; |
| 2744 } | |
|
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|
2745 uint failures() { return _failures; } |
| 355 | 2746 }; |
| 2747 | |
| 2748 bool G1CollectedHeap::check_heap_region_claim_values(jint claim_value) { | |
| 2749 CheckClaimValuesClosure cl(claim_value); | |
| 2750 heap_region_iterate(&cl); | |
| 2751 return cl.failures() == 0; | |
| 2752 } | |
|
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|
2753 |
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|
2754 class CheckClaimValuesInCSetHRClosure: public HeapRegionClosure { |
|
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2755 private: |
|
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|
2756 jint _claim_value; |
|
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2757 uint _failures; |
|
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|
2758 |
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|
2759 public: |
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|
2760 CheckClaimValuesInCSetHRClosure(jint claim_value) : |
|
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2761 _claim_value(claim_value), _failures(0) { } |
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2762 |
|
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|
2763 uint failures() { return _failures; } |
|
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2764 |
|
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|
2765 bool doHeapRegion(HeapRegion* hr) { |
|
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|
2766 assert(hr->in_collection_set(), "how?"); |
|
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|
2767 assert(!hr->isHumongous(), "H-region in CSet"); |
|
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2768 if (hr->claim_value() != _claim_value) { |
|
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|
2769 gclog_or_tty->print_cr("CSet Region " HR_FORMAT ", " |
|
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|
2770 "claim value = %d, should be %d", |
|
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|
2771 HR_FORMAT_PARAMS(hr), |
|
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|
2772 hr->claim_value(), _claim_value); |
|
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|
2773 _failures += 1; |
|
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|
2774 } |
|
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|
2775 return false; |
|
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|
2776 } |
|
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|
2777 }; |
|
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|
2778 |
|
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|
2779 bool G1CollectedHeap::check_cset_heap_region_claim_values(jint claim_value) { |
|
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|
2780 CheckClaimValuesInCSetHRClosure cl(claim_value); |
|
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|
2781 collection_set_iterate(&cl); |
|
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|
2782 return cl.failures() == 0; |
|
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|
2783 } |
| 355 | 2784 #endif // ASSERT |
| 342 | 2785 |
|
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|
2786 // Clear the cached CSet starting regions and (more importantly) |
|
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|
2787 // the time stamps. Called when we reset the GC time stamp. |
|
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|
2788 void G1CollectedHeap::clear_cset_start_regions() { |
|
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|
2789 assert(_worker_cset_start_region != NULL, "sanity"); |
|
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|
2790 assert(_worker_cset_start_region_time_stamp != NULL, "sanity"); |
|
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|
2791 |
|
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|
2792 int n_queues = MAX2((int)ParallelGCThreads, 1); |
|
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|
2793 for (int i = 0; i < n_queues; i++) { |
|
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|
2794 _worker_cset_start_region[i] = NULL; |
|
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|
2795 _worker_cset_start_region_time_stamp[i] = 0; |
|
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|
2796 } |
|
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|
2797 } |
|
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|
2798 |
|
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|
2799 // Given the id of a worker, obtain or calculate a suitable |
|
fd2b426c30db
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|
2800 // starting region for iterating over the current collection set. |
|
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|
2801 HeapRegion* G1CollectedHeap::start_cset_region_for_worker(int worker_i) { |
|
4709
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|
2802 assert(get_gc_time_stamp() > 0, "should have been updated by now"); |
|
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|
2803 |
|
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|
2804 HeapRegion* result = NULL; |
|
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|
2805 unsigned gc_time_stamp = get_gc_time_stamp(); |
|
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|
2806 |
|
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|
2807 if (_worker_cset_start_region_time_stamp[worker_i] == gc_time_stamp) { |
|
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|
2808 // Cached starting region for current worker was set |
|
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|
2809 // during the current pause - so it's valid. |
|
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|
2810 // Note: the cached starting heap region may be NULL |
|
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|
2811 // (when the collection set is empty). |
|
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changeset
|
2812 result = _worker_cset_start_region[worker_i]; |
|
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|
2813 assert(result == NULL || result->in_collection_set(), "sanity"); |
|
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|
2814 return result; |
|
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|
2815 } |
|
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|
2816 |
|
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|
2817 // The cached entry was not valid so let's calculate |
|
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|
2818 // a suitable starting heap region for this worker. |
|
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|
2819 |
|
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|
2820 // We want the parallel threads to start their collection |
|
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|
2821 // set iteration at different collection set regions to |
|
fd2b426c30db
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|
2822 // avoid contention. |
|
fd2b426c30db
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changeset
|
2823 // If we have: |
|
fd2b426c30db
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|
2824 // n collection set regions |
|
fd2b426c30db
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|
2825 // p threads |
|
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changeset
|
2826 // Then thread t will start at region floor ((t * n) / p) |
|
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|
2827 |
|
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|
2828 result = g1_policy()->collection_set(); |
|
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|
2829 if (G1CollectedHeap::use_parallel_gc_threads()) { |
|
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|
2830 uint cs_size = g1_policy()->cset_region_length(); |
|
4728
441e946dc1af
7121618: Change type of number of GC workers to unsigned int.
jmasa
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4711
diff
changeset
|
2831 uint active_workers = workers()->active_workers(); |
|
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|
2832 assert(UseDynamicNumberOfGCThreads || |
|
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|
2833 active_workers == workers()->total_workers(), |
|
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|
2834 "Unless dynamic should use total workers"); |
|
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|
2835 |
|
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|
2836 uint end_ind = (cs_size * worker_i) / active_workers; |
|
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|
2837 uint start_ind = 0; |
|
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|
2838 |
|
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|
2839 if (worker_i > 0 && |
|
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|
2840 _worker_cset_start_region_time_stamp[worker_i - 1] == gc_time_stamp) { |
|
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|
2841 // Previous workers starting region is valid |
|
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|
2842 // so let's iterate from there |
|
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|
2843 start_ind = (cs_size * (worker_i - 1)) / active_workers; |
|
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|
2844 result = _worker_cset_start_region[worker_i - 1]; |
|
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|
2845 } |
|
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|
2846 |
|
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|
2847 for (uint i = start_ind; i < end_ind; i++) { |
|
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|
2848 result = result->next_in_collection_set(); |
|
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|
2849 } |
|
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|
2850 } |
|
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|
2851 |
|
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changeset
|
2852 // Note: the calculated starting heap region may be NULL |
|
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changeset
|
2853 // (when the collection set is empty). |
|
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changeset
|
2854 assert(result == NULL || result->in_collection_set(), "sanity"); |
|
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changeset
|
2855 assert(_worker_cset_start_region_time_stamp[worker_i] != gc_time_stamp, |
|
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changeset
|
2856 "should be updated only once per pause"); |
|
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changeset
|
2857 _worker_cset_start_region[worker_i] = result; |
|
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7119908: G1: Cache CSet start region for each worker for subsequent reuse
johnc
parents:
4708
diff
changeset
|
2858 OrderAccess::storestore(); |
|
fd2b426c30db
7119908: G1: Cache CSet start region for each worker for subsequent reuse
johnc
parents:
4708
diff
changeset
|
2859 _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
|
2860 return result; |
|
dc467e8b2c5e
7112743: G1: Reduce overhead of marking closure during evacuation pauses
johnc
parents:
4095
diff
changeset
|
2861 } |
|
dc467e8b2c5e
7112743: G1: Reduce overhead of marking closure during evacuation pauses
johnc
parents:
4095
diff
changeset
|
2862 |
| 342 | 2863 void G1CollectedHeap::collection_set_iterate(HeapRegionClosure* cl) { |
| 2864 HeapRegion* r = g1_policy()->collection_set(); | |
| 2865 while (r != NULL) { | |
| 2866 HeapRegion* next = r->next_in_collection_set(); | |
| 2867 if (cl->doHeapRegion(r)) { | |
| 2868 cl->incomplete(); | |
| 2869 return; | |
| 2870 } | |
| 2871 r = next; | |
| 2872 } | |
| 2873 } | |
| 2874 | |
| 2875 void G1CollectedHeap::collection_set_iterate_from(HeapRegion* r, | |
| 2876 HeapRegionClosure *cl) { | |
|
1656
4e5661ba9d98
6944166: G1: explicit GCs are not always handled correctly
tonyp
parents:
1611
diff
changeset
|
2877 if (r == NULL) { |
|
4e5661ba9d98
6944166: G1: explicit GCs are not always handled correctly
tonyp
parents:
1611
diff
changeset
|
2878 // 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
|
2879 return; |
|
4e5661ba9d98
6944166: G1: explicit GCs are not always handled correctly
tonyp
parents:
1611
diff
changeset
|
2880 } |
|
4e5661ba9d98
6944166: G1: explicit GCs are not always handled correctly
tonyp
parents:
1611
diff
changeset
|
2881 |
| 342 | 2882 assert(r->in_collection_set(), |
| 2883 "Start region must be a member of the collection set."); | |
| 2884 HeapRegion* cur = r; | |
| 2885 while (cur != NULL) { | |
| 2886 HeapRegion* next = cur->next_in_collection_set(); | |
| 2887 if (cl->doHeapRegion(cur) && false) { | |
| 2888 cl->incomplete(); | |
| 2889 return; | |
| 2890 } | |
| 2891 cur = next; | |
| 2892 } | |
| 2893 cur = g1_policy()->collection_set(); | |
| 2894 while (cur != r) { | |
| 2895 HeapRegion* next = cur->next_in_collection_set(); | |
| 2896 if (cl->doHeapRegion(cur) && false) { | |
| 2897 cl->incomplete(); | |
| 2898 return; | |
| 2899 } | |
| 2900 cur = next; | |
| 2901 } | |
| 2902 } | |
| 2903 | |
| 2904 CompactibleSpace* G1CollectedHeap::first_compactible_space() { | |
| 3766 | 2905 return n_regions() > 0 ? region_at(0) : NULL; |
| 342 | 2906 } |
| 2907 | |
| 2908 | |
| 2909 Space* G1CollectedHeap::space_containing(const void* addr) const { | |
| 2910 Space* res = heap_region_containing(addr); | |
| 2911 if (res == NULL) | |
| 2912 res = perm_gen()->space_containing(addr); | |
| 2913 return res; | |
| 2914 } | |
| 2915 | |
| 2916 HeapWord* G1CollectedHeap::block_start(const void* addr) const { | |
| 2917 Space* sp = space_containing(addr); | |
| 2918 if (sp != NULL) { | |
| 2919 return sp->block_start(addr); | |
| 2920 } | |
| 2921 return NULL; | |
| 2922 } | |
| 2923 | |
| 2924 size_t G1CollectedHeap::block_size(const HeapWord* addr) const { | |
| 2925 Space* sp = space_containing(addr); | |
| 2926 assert(sp != NULL, "block_size of address outside of heap"); | |
| 2927 return sp->block_size(addr); | |
| 2928 } | |
| 2929 | |
| 2930 bool G1CollectedHeap::block_is_obj(const HeapWord* addr) const { | |
| 2931 Space* sp = space_containing(addr); | |
| 2932 return sp->block_is_obj(addr); | |
| 2933 } | |
| 2934 | |
| 2935 bool G1CollectedHeap::supports_tlab_allocation() const { | |
| 2936 return true; | |
| 2937 } | |
| 2938 | |
| 2939 size_t G1CollectedHeap::tlab_capacity(Thread* ignored) const { | |
| 2940 return HeapRegion::GrainBytes; | |
| 2941 } | |
| 2942 | |
| 2943 size_t G1CollectedHeap::unsafe_max_tlab_alloc(Thread* ignored) const { | |
| 2944 // Return the remaining space in the cur alloc region, but not less than | |
| 2945 // the min TLAB size. | |
|
1313
664ae0c5e0e5
6755988: G1: assert(new_obj != 0 || ... "should be forwarded")
johnc
parents:
1282
diff
changeset
|
2946 |
|
664ae0c5e0e5
6755988: G1: assert(new_obj != 0 || ... "should be forwarded")
johnc
parents:
1282
diff
changeset
|
2947 // Also, this value can be at most the humongous object threshold, |
|
664ae0c5e0e5
6755988: G1: assert(new_obj != 0 || ... "should be forwarded")
johnc
parents:
1282
diff
changeset
|
2948 // since we can't allow tlabs to grow big enough to accomodate |
|
664ae0c5e0e5
6755988: G1: assert(new_obj != 0 || ... "should be forwarded")
johnc
parents:
1282
diff
changeset
|
2949 // humongous objects. |
|
664ae0c5e0e5
6755988: G1: assert(new_obj != 0 || ... "should be forwarded")
johnc
parents:
1282
diff
changeset
|
2950 |
|
2433
abdfc822206f
7023069: G1: Introduce symmetric locking in the slow allocation path
tonyp
parents:
2432
diff
changeset
|
2951 HeapRegion* hr = _mutator_alloc_region.get(); |
|
1313
664ae0c5e0e5
6755988: G1: assert(new_obj != 0 || ... "should be forwarded")
johnc
parents:
1282
diff
changeset
|
2952 size_t max_tlab_size = _humongous_object_threshold_in_words * wordSize; |
|
2433
abdfc822206f
7023069: G1: Introduce symmetric locking in the slow allocation path
tonyp
parents:
2432
diff
changeset
|
2953 if (hr == NULL) { |
|
1313
664ae0c5e0e5
6755988: G1: assert(new_obj != 0 || ... "should be forwarded")
johnc
parents:
1282
diff
changeset
|
2954 return max_tlab_size; |
| 342 | 2955 } else { |
|
2433
abdfc822206f
7023069: G1: Introduce symmetric locking in the slow allocation path
tonyp
parents:
2432
diff
changeset
|
2956 return MIN2(MAX2(hr->free(), (size_t) MinTLABSize), max_tlab_size); |
| 342 | 2957 } |
| 2958 } | |
| 2959 | |
| 2960 size_t G1CollectedHeap::max_capacity() const { | |
|
2188
c33825b68624
6923430: G1: assert(res != 0,"This should have worked.")
johnc
parents:
2173
diff
changeset
|
2961 return _g1_reserved.byte_size(); |
| 342 | 2962 } |
| 2963 | |
| 2964 jlong G1CollectedHeap::millis_since_last_gc() { | |
| 2965 // assert(false, "NYI"); | |
| 2966 return 0; | |
| 2967 } | |
| 2968 | |
| 2969 void G1CollectedHeap::prepare_for_verify() { | |
| 2970 if (SafepointSynchronize::is_at_safepoint() || ! UseTLAB) { | |
| 2971 ensure_parsability(false); | |
| 2972 } | |
| 2973 g1_rem_set()->prepare_for_verify(); | |
| 2974 } | |
| 2975 | |
| 2976 class VerifyLivenessOopClosure: public OopClosure { | |
|
3772
6747fd0512e0
7004681: G1: Extend marking verification to Full GCs
johnc
parents:
3766
diff
changeset
|
2977 G1CollectedHeap* _g1h; |
|
6747fd0512e0
7004681: G1: Extend marking verification to Full GCs
johnc
parents:
3766
diff
changeset
|
2978 VerifyOption _vo; |
| 342 | 2979 public: |
|
3772
6747fd0512e0
7004681: G1: Extend marking verification to Full GCs
johnc
parents:
3766
diff
changeset
|
2980 VerifyLivenessOopClosure(G1CollectedHeap* g1h, VerifyOption vo): |
|
6747fd0512e0
7004681: G1: Extend marking verification to Full GCs
johnc
parents:
3766
diff
changeset
|
2981 _g1h(g1h), _vo(vo) |
|
6747fd0512e0
7004681: G1: Extend marking verification to Full GCs
johnc
parents:
3766
diff
changeset
|
2982 { } |
|
845
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
ysr
parents:
838
diff
changeset
|
2983 void do_oop(narrowOop *p) { do_oop_work(p); } |
|
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
ysr
parents:
838
diff
changeset
|
2984 void do_oop( oop *p) { do_oop_work(p); } |
|
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
ysr
parents:
838
diff
changeset
|
2985 |
|
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
ysr
parents:
838
diff
changeset
|
2986 template <class T> void do_oop_work(T *p) { |
|
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
ysr
parents:
838
diff
changeset
|
2987 oop obj = oopDesc::load_decode_heap_oop(p); |
|
3772
6747fd0512e0
7004681: G1: Extend marking verification to Full GCs
johnc
parents:
3766
diff
changeset
|
2988 guarantee(obj == NULL || !_g1h->is_obj_dead_cond(obj, _vo), |
|
845
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
ysr
parents:
838
diff
changeset
|
2989 "Dead object referenced by a not dead object"); |
| 342 | 2990 } |
| 2991 }; | |
| 2992 | |
| 2993 class VerifyObjsInRegionClosure: public ObjectClosure { | |
| 811 | 2994 private: |
| 342 | 2995 G1CollectedHeap* _g1h; |
| 2996 size_t _live_bytes; | |
| 2997 HeapRegion *_hr; | |
|
3772
6747fd0512e0
7004681: G1: Extend marking verification to Full GCs
johnc
parents:
3766
diff
changeset
|
2998 VerifyOption _vo; |
| 342 | 2999 public: |
|
3772
6747fd0512e0
7004681: G1: Extend marking verification to Full GCs
johnc
parents:
3766
diff
changeset
|
3000 // _vo == UsePrevMarking -> use "prev" marking information, |
|
6747fd0512e0
7004681: G1: Extend marking verification to Full GCs
johnc
parents:
3766
diff
changeset
|
3001 // _vo == UseNextMarking -> use "next" marking information, |
|
6747fd0512e0
7004681: G1: Extend marking verification to Full GCs
johnc
parents:
3766
diff
changeset
|
3002 // _vo == UseMarkWord -> use mark word from object header. |
|
6747fd0512e0
7004681: G1: Extend marking verification to Full GCs
johnc
parents:
3766
diff
changeset
|
3003 VerifyObjsInRegionClosure(HeapRegion *hr, VerifyOption vo) |
|
6747fd0512e0
7004681: G1: Extend marking verification to Full GCs
johnc
parents:
3766
diff
changeset
|
3004 : _live_bytes(0), _hr(hr), _vo(vo) { |
| 342 | 3005 _g1h = G1CollectedHeap::heap(); |
| 3006 } | |
| 3007 void do_object(oop o) { | |
|
3772
6747fd0512e0
7004681: G1: Extend marking verification to Full GCs
johnc
parents:
3766
diff
changeset
|
3008 VerifyLivenessOopClosure isLive(_g1h, _vo); |
| 342 | 3009 assert(o != NULL, "Huh?"); |
|
3772
6747fd0512e0
7004681: G1: Extend marking verification to Full GCs
johnc
parents:
3766
diff
changeset
|
3010 if (!_g1h->is_obj_dead_cond(o, _vo)) { |
|
6747fd0512e0
7004681: G1: Extend marking verification to Full GCs
johnc
parents:
3766
diff
changeset
|
3011 // If the object is alive according to the mark word, |
|
6747fd0512e0
7004681: G1: Extend marking verification to Full GCs
johnc
parents:
3766
diff
changeset
|
3012 // then verify that the marking information agrees. |
|
6747fd0512e0
7004681: G1: Extend marking verification to Full GCs
johnc
parents:
3766
diff
changeset
|
3013 // Note we can't verify the contra-positive of the |
|
6747fd0512e0
7004681: G1: Extend marking verification to Full GCs
johnc
parents:
3766
diff
changeset
|
3014 // above: if the object is dead (according to the mark |
|
6747fd0512e0
7004681: G1: Extend marking verification to Full GCs
johnc
parents:
3766
diff
changeset
|
3015 // word), it may not be marked, or may have been marked |
|
6747fd0512e0
7004681: G1: Extend marking verification to Full GCs
johnc
parents:
3766
diff
changeset
|
3016 // but has since became dead, or may have been allocated |
|
6747fd0512e0
7004681: G1: Extend marking verification to Full GCs
johnc
parents:
3766
diff
changeset
|
3017 // since the last marking. |
|
6747fd0512e0
7004681: G1: Extend marking verification to Full GCs
johnc
parents:
3766
diff
changeset
|
3018 if (_vo == VerifyOption_G1UseMarkWord) { |
|
6747fd0512e0
7004681: G1: Extend marking verification to Full GCs
johnc
parents:
3766
diff
changeset
|
3019 guarantee(!_g1h->is_obj_dead(o), "mark word and concurrent mark mismatch"); |
|
6747fd0512e0
7004681: G1: Extend marking verification to Full GCs
johnc
parents:
3766
diff
changeset
|
3020 } |
|
6747fd0512e0
7004681: G1: Extend marking verification to Full GCs
johnc
parents:
3766
diff
changeset
|
3021 |
| 342 | 3022 o->oop_iterate(&isLive); |
|
1389
5dbd9300cf9c
6943926: G1: Integer overflow during heap region verification
johnc
parents:
1388
diff
changeset
|
3023 if (!_hr->obj_allocated_since_prev_marking(o)) { |
|
5dbd9300cf9c
6943926: G1: Integer overflow during heap region verification
johnc
parents:
1388
diff
changeset
|
3024 size_t obj_size = o->size(); // Make sure we don't overflow |
|
5dbd9300cf9c
6943926: G1: Integer overflow during heap region verification
johnc
parents:
1388
diff
changeset
|
3025 _live_bytes += (obj_size * HeapWordSize); |
|
5dbd9300cf9c
6943926: G1: Integer overflow during heap region verification
johnc
parents:
1388
diff
changeset
|
3026 } |
| 342 | 3027 } |
| 3028 } | |
| 3029 size_t live_bytes() { return _live_bytes; } | |
| 3030 }; | |
| 3031 | |
| 3032 class PrintObjsInRegionClosure : public ObjectClosure { | |
| 3033 HeapRegion *_hr; | |
| 3034 G1CollectedHeap *_g1; | |
| 3035 public: | |
| 3036 PrintObjsInRegionClosure(HeapRegion *hr) : _hr(hr) { | |
| 3037 _g1 = G1CollectedHeap::heap(); | |
| 3038 }; | |
| 3039 | |
| 3040 void do_object(oop o) { | |
| 3041 if (o != NULL) { | |
| 3042 HeapWord *start = (HeapWord *) o; | |
| 3043 size_t word_sz = o->size(); | |
| 3044 gclog_or_tty->print("\nPrinting obj "PTR_FORMAT" of size " SIZE_FORMAT | |
| 3045 " isMarkedPrev %d isMarkedNext %d isAllocSince %d\n", | |
| 3046 (void*) o, word_sz, | |
| 3047 _g1->isMarkedPrev(o), | |
| 3048 _g1->isMarkedNext(o), | |
| 3049 _hr->obj_allocated_since_prev_marking(o)); | |
| 3050 HeapWord *end = start + word_sz; | |
| 3051 HeapWord *cur; | |
| 3052 int *val; | |
| 3053 for (cur = start; cur < end; cur++) { | |
| 3054 val = (int *) cur; | |
| 3055 gclog_or_tty->print("\t "PTR_FORMAT":"PTR_FORMAT"\n", val, *val); | |
| 3056 } | |
| 3057 } | |
| 3058 } | |
| 3059 }; | |
| 3060 | |
| 3061 class VerifyRegionClosure: public HeapRegionClosure { | |
| 811 | 3062 private: |
|
3772
6747fd0512e0
7004681: G1: Extend marking verification to Full GCs
johnc
parents:
3766
diff
changeset
|
3063 bool _par; |
|
6747fd0512e0
7004681: G1: Extend marking verification to Full GCs
johnc
parents:
3766
diff
changeset
|
3064 VerifyOption _vo; |
|
6747fd0512e0
7004681: G1: Extend marking verification to Full GCs
johnc
parents:
3766
diff
changeset
|
3065 bool _failures; |
| 811 | 3066 public: |
|
3772
6747fd0512e0
7004681: G1: Extend marking verification to Full GCs
johnc
parents:
3766
diff
changeset
|
3067 // _vo == UsePrevMarking -> use "prev" marking information, |
|
6747fd0512e0
7004681: G1: Extend marking verification to Full GCs
johnc
parents:
3766
diff
changeset
|
3068 // _vo == UseNextMarking -> use "next" marking information, |
|
6747fd0512e0
7004681: G1: Extend marking verification to Full GCs
johnc
parents:
3766
diff
changeset
|
3069 // _vo == UseMarkWord -> use mark word from object header. |
| 6008 | 3070 VerifyRegionClosure(bool par, VerifyOption vo) |
| 3071 : _par(par), | |
|
3772
6747fd0512e0
7004681: G1: Extend marking verification to Full GCs
johnc
parents:
3766
diff
changeset
|
3072 _vo(vo), |
|
1020
ff2402f6a50b
6882730: G1: parallel heap verification messes up region dump
tonyp
parents:
1019
diff
changeset
|
3073 _failures(false) {} |
|
ff2402f6a50b
6882730: G1: parallel heap verification messes up region dump
tonyp
parents:
1019
diff
changeset
|
3074 |
|
ff2402f6a50b
6882730: G1: parallel heap verification messes up region dump
tonyp
parents:
1019
diff
changeset
|
3075 bool failures() { |
|
ff2402f6a50b
6882730: G1: parallel heap verification messes up region dump
tonyp
parents:
1019
diff
changeset
|
3076 return _failures; |
|
ff2402f6a50b
6882730: G1: parallel heap verification messes up region dump
tonyp
parents:
1019
diff
changeset
|
3077 } |
|
845
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
ysr
parents:
838
diff
changeset
|
3078 |
| 342 | 3079 bool doHeapRegion(HeapRegion* r) { |
| 390 | 3080 guarantee(_par || r->claim_value() == HeapRegion::InitialClaimValue, |
| 3081 "Should be unclaimed at verify points."); | |
|
637
25e146966e7c
6817419: G1: Enable extensive verification for humongous regions
iveresov
parents:
636
diff
changeset
|
3082 if (!r->continuesHumongous()) { |
|
1020
ff2402f6a50b
6882730: G1: parallel heap verification messes up region dump
tonyp
parents:
1019
diff
changeset
|
3083 bool failures = false; |
| 6008 | 3084 r->verify(_vo, &failures); |
|
1020
ff2402f6a50b
6882730: G1: parallel heap verification messes up region dump
tonyp
parents:
1019
diff
changeset
|
3085 if (failures) { |
|
ff2402f6a50b
6882730: G1: parallel heap verification messes up region dump
tonyp
parents:
1019
diff
changeset
|
3086 _failures = true; |
|
ff2402f6a50b
6882730: G1: parallel heap verification messes up region dump
tonyp
parents:
1019
diff
changeset
|
3087 } else { |
|
3772
6747fd0512e0
7004681: G1: Extend marking verification to Full GCs
johnc
parents:
3766
diff
changeset
|
3088 VerifyObjsInRegionClosure not_dead_yet_cl(r, _vo); |
|
1020
ff2402f6a50b
6882730: G1: parallel heap verification messes up region dump
tonyp
parents:
1019
diff
changeset
|
3089 r->object_iterate(¬_dead_yet_cl); |
|
4787
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
4785
diff
changeset
|
3090 if (_vo != VerifyOption_G1UseNextMarking) { |
|
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
4785
diff
changeset
|
3091 if (r->max_live_bytes() < not_dead_yet_cl.live_bytes()) { |
|
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
4785
diff
changeset
|
3092 gclog_or_tty->print_cr("["PTR_FORMAT","PTR_FORMAT"] " |
|
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
4785
diff
changeset
|
3093 "max_live_bytes "SIZE_FORMAT" " |
|
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
4785
diff
changeset
|
3094 "< calculated "SIZE_FORMAT, |
|
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
4785
diff
changeset
|
3095 r->bottom(), r->end(), |
|
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
4785
diff
changeset
|
3096 r->max_live_bytes(), |
|
1020
ff2402f6a50b
6882730: G1: parallel heap verification messes up region dump
tonyp
parents:
1019
diff
changeset
|
3097 not_dead_yet_cl.live_bytes()); |
|
4787
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|
3098 _failures = true; |
|
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|
3099 } |
|
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|
3100 } else { |
|
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|
3101 // When vo == UseNextMarking we cannot currently do a sanity |
|
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|
3102 // check on the live bytes as the calculation has not been |
|
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|
3103 // finalized yet. |
|
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|
3104 } |
|
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|
3105 } |
| 342 | 3106 } |
|
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|
3107 return false; // stop the region iteration if we hit a failure |
| 342 | 3108 } |
| 3109 }; | |
| 3110 | |
| 3111 class VerifyRootsClosure: public OopsInGenClosure { | |
| 3112 private: | |
| 3113 G1CollectedHeap* _g1h; | |
|
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|
3114 VerifyOption _vo; |
| 342 | 3115 bool _failures; |
| 3116 public: | |
|
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|
3117 // _vo == UsePrevMarking -> use "prev" marking information, |
|
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3118 // _vo == UseNextMarking -> use "next" marking information, |
|
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|
3119 // _vo == UseMarkWord -> use mark word from object header. |
|
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|
3120 VerifyRootsClosure(VerifyOption vo) : |
|
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|
3121 _g1h(G1CollectedHeap::heap()), |
|
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|
3122 _vo(vo), |
|
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|
3123 _failures(false) { } |
| 342 | 3124 |
| 3125 bool failures() { return _failures; } | |
| 3126 | |
|
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|
3127 template <class T> void do_oop_nv(T* p) { |
|
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|
3128 T heap_oop = oopDesc::load_heap_oop(p); |
|
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|
3129 if (!oopDesc::is_null(heap_oop)) { |
|
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|
3130 oop obj = oopDesc::decode_heap_oop_not_null(heap_oop); |
|
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|
3131 if (_g1h->is_obj_dead_cond(obj, _vo)) { |
| 342 | 3132 gclog_or_tty->print_cr("Root location "PTR_FORMAT" " |
|
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|
3133 "points to dead obj "PTR_FORMAT, p, (void*) obj); |
|
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|
3134 if (_vo == VerifyOption_G1UseMarkWord) { |
|
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|
3135 gclog_or_tty->print_cr(" Mark word: "PTR_FORMAT, (void*)(obj->mark())); |
|
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|
3136 } |
| 342 | 3137 obj->print_on(gclog_or_tty); |
| 3138 _failures = true; | |
| 3139 } | |
| 3140 } | |
| 3141 } | |
|
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|
3142 |
|
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|
3143 void do_oop(oop* p) { do_oop_nv(p); } |
|
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|
3144 void do_oop(narrowOop* p) { do_oop_nv(p); } |
| 342 | 3145 }; |
| 3146 | |
| 390 | 3147 // This is the task used for parallel heap verification. |
| 3148 | |
| 3149 class G1ParVerifyTask: public AbstractGangTask { | |
| 3150 private: | |
| 3151 G1CollectedHeap* _g1h; | |
|
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|
3152 VerifyOption _vo; |
|
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|
3153 bool _failures; |
| 390 | 3154 |
| 3155 public: | |
|
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|
3156 // _vo == UsePrevMarking -> use "prev" marking information, |
|
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|
3157 // _vo == UseNextMarking -> use "next" marking information, |
|
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|
3158 // _vo == UseMarkWord -> use mark word from object header. |
| 6008 | 3159 G1ParVerifyTask(G1CollectedHeap* g1h, VerifyOption vo) : |
| 390 | 3160 AbstractGangTask("Parallel verify task"), |
|
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|
3161 _g1h(g1h), |
|
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|
3162 _vo(vo), |
|
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|
3163 _failures(false) { } |
|
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|
3164 |
|
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|
3165 bool failures() { |
|
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|
3166 return _failures; |
|
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|
3167 } |
| 390 | 3168 |
|
4728
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|
3169 void work(uint worker_id) { |
|
637
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6817419: G1: Enable extensive verification for humongous regions
iveresov
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diff
changeset
|
3170 HandleMark hm; |
| 6008 | 3171 VerifyRegionClosure blk(true, _vo); |
|
4728
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|
3172 _g1h->heap_region_par_iterate_chunked(&blk, worker_id, |
|
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|
3173 _g1h->workers()->active_workers(), |
| 390 | 3174 HeapRegion::ParVerifyClaimValue); |
|
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|
3175 if (blk.failures()) { |
|
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|
3176 _failures = true; |
|
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|
3177 } |
| 390 | 3178 } |
| 3179 }; | |
| 3180 | |
| 6008 | 3181 void G1CollectedHeap::verify(bool silent) { |
| 3182 verify(silent, VerifyOption_G1UsePrevMarking); | |
| 3183 } | |
| 3184 | |
| 3185 void G1CollectedHeap::verify(bool silent, | |
|
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|
3186 VerifyOption vo) { |
| 342 | 3187 if (SafepointSynchronize::is_at_safepoint() || ! UseTLAB) { |
|
3293
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|
3188 if (!silent) { gclog_or_tty->print("Roots (excluding permgen) "); } |
|
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|
3189 VerifyRootsClosure rootsCl(vo); |
|
4095
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|
3190 |
|
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|
3191 assert(Thread::current()->is_VM_thread(), |
|
bca17e38de00
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|
3192 "Expected to be executed serially by the VM thread at this point"); |
|
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|
3193 |
|
989
148e5441d916
6863023: need non-perm oops in code cache for JSR 292
jrose
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890
diff
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|
3194 CodeBlobToOopClosure blobsCl(&rootsCl, /*do_marking=*/ false); |
|
3772
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|
3195 |
|
3293
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changeset
|
3196 // We apply the relevant closures to all the oops in the |
|
1f4413413144
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3289
diff
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|
3197 // system dictionary, the string table and the code cache. |
|
4910
caa4652b4414
7129892: G1: explicit marking cycle initiation might fail to initiate a marking cycle
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diff
changeset
|
3198 const int so = SO_AllClasses | SO_Strings | SO_CodeCache; |
|
3772
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|
3199 |
|
3293
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diff
changeset
|
3200 process_strong_roots(true, // activate StrongRootsScope |
|
1f4413413144
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3289
diff
changeset
|
3201 true, // we set "collecting perm gen" to true, |
|
1f4413413144
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|
3202 // so we don't reset the dirty cards in the perm gen. |
|
4910
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|
3203 ScanningOption(so), // roots scanning options |
| 342 | 3204 &rootsCl, |
|
989
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|
3205 &blobsCl, |
| 342 | 3206 &rootsCl); |
|
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|
3207 |
|
6747fd0512e0
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changeset
|
3208 // If we're verifying after the marking phase of a Full GC then we can't |
|
6747fd0512e0
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|
3209 // treat the perm gen as roots into the G1 heap. Some of the objects in |
|
6747fd0512e0
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changeset
|
3210 // the perm gen may be dead and hence not marked. If one of these dead |
|
6747fd0512e0
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changeset
|
3211 // objects is considered to be a root then we may end up with a false |
|
6747fd0512e0
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changeset
|
3212 // "Root location <x> points to dead ob <y>" failure. |
|
6747fd0512e0
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|
3213 if (vo != VerifyOption_G1UseMarkWord) { |
|
6747fd0512e0
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|
3214 // Since we used "collecting_perm_gen" == true above, we will not have |
|
6747fd0512e0
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changeset
|
3215 // checked the refs from perm into the G1-collected heap. We check those |
|
6747fd0512e0
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|
3216 // references explicitly below. Whether the relevant cards are dirty |
|
6747fd0512e0
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|
3217 // is checked further below in the rem set verification. |
|
6747fd0512e0
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diff
changeset
|
3218 if (!silent) { gclog_or_tty->print("Permgen roots "); } |
|
6747fd0512e0
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|
3219 perm_gen()->oop_iterate(&rootsCl); |
|
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|
3220 } |
|
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|
3221 bool failures = rootsCl.failures(); |
|
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|
3222 |
|
6747fd0512e0
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changeset
|
3223 if (vo != VerifyOption_G1UseMarkWord) { |
|
6747fd0512e0
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changeset
|
3224 // If we're verifying during a full GC then the region sets |
|
6747fd0512e0
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changeset
|
3225 // will have been torn down at the start of the GC. Therefore |
|
6747fd0512e0
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changeset
|
3226 // verifying the region sets will fail. So we only verify |
|
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|
3227 // the region sets when not in a full GC. |
|
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|
3228 if (!silent) { gclog_or_tty->print("HeapRegionSets "); } |
|
6747fd0512e0
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3766
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|
3229 verify_region_sets(); |
|
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3766
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|
3230 } |
|
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|
3231 |
| 2152 | 3232 if (!silent) { gclog_or_tty->print("HeapRegions "); } |
| 390 | 3233 if (GCParallelVerificationEnabled && ParallelGCThreads > 1) { |
| 3234 assert(check_heap_region_claim_values(HeapRegion::InitialClaimValue), | |
| 3235 "sanity check"); | |
| 3236 | |
| 6008 | 3237 G1ParVerifyTask task(this, vo); |
|
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|
3238 assert(UseDynamicNumberOfGCThreads || |
|
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|
3239 workers()->active_workers() == workers()->total_workers(), |
|
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|
3240 "If not dynamic should be using all the workers"); |
|
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|
3241 int n_workers = workers()->active_workers(); |
| 390 | 3242 set_par_threads(n_workers); |
| 3243 workers()->run_task(&task); | |
| 3244 set_par_threads(0); | |
|
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|
3245 if (task.failures()) { |
|
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|
3246 failures = true; |
|
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|
3247 } |
| 390 | 3248 |
|
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|
3249 // Checks that the expected amount of parallel work was done. |
|
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|
3250 // The implication is that n_workers is > 0. |
| 390 | 3251 assert(check_heap_region_claim_values(HeapRegion::ParVerifyClaimValue), |
| 3252 "sanity check"); | |
| 3253 | |
| 3254 reset_heap_region_claim_values(); | |
| 3255 | |
| 3256 assert(check_heap_region_claim_values(HeapRegion::InitialClaimValue), | |
| 3257 "sanity check"); | |
| 3258 } else { | |
| 6008 | 3259 VerifyRegionClosure blk(false, vo); |
| 3766 | 3260 heap_region_iterate(&blk); |
|
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|
3261 if (blk.failures()) { |
|
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|
3262 failures = true; |
|
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|
3263 } |
| 390 | 3264 } |
| 2152 | 3265 if (!silent) gclog_or_tty->print("RemSet "); |
| 342 | 3266 rem_set()->verify(); |
|
1020
ff2402f6a50b
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|
3267 |
|
ff2402f6a50b
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|
3268 if (failures) { |
|
ff2402f6a50b
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|
3269 gclog_or_tty->print_cr("Heap:"); |
|
4073
53074c2c4600
7099849: G1: include heap region information in hs_err files
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changeset
|
3270 // It helps to have the per-region information in the output to |
|
53074c2c4600
7099849: G1: include heap region information in hs_err files
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|
3271 // help us track down what went wrong. This is why we call |
|
53074c2c4600
7099849: G1: include heap region information in hs_err files
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|
3272 // print_extended_on() instead of print_on(). |
|
53074c2c4600
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|
3273 print_extended_on(gclog_or_tty); |
|
1020
ff2402f6a50b
6882730: G1: parallel heap verification messes up region dump
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|
3274 gclog_or_tty->print_cr(""); |
|
1547
fb1a39993f69
6951319: enable solaris builds using Sun Studio 12 update 1
jcoomes
parents:
1545
diff
changeset
|
3275 #ifndef PRODUCT |
| 1044 | 3276 if (VerifyDuringGC && G1VerifyDuringGCPrintReachable) { |
| 1388 | 3277 concurrent_mark()->print_reachable("at-verification-failure", |
|
3772
6747fd0512e0
7004681: G1: Extend marking verification to Full GCs
johnc
parents:
3766
diff
changeset
|
3278 vo, false /* all */); |
|
1020
ff2402f6a50b
6882730: G1: parallel heap verification messes up region dump
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|
3279 } |
|
1547
fb1a39993f69
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jcoomes
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diff
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|
3280 #endif |
|
1020
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|
3281 gclog_or_tty->flush(); |
|
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|
3282 } |
|
ff2402f6a50b
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|
3283 guarantee(!failures, "there should not have been any failures"); |
| 342 | 3284 } else { |
| 3285 if (!silent) gclog_or_tty->print("(SKIPPING roots, heapRegions, remset) "); | |
| 3286 } | |
| 3287 } | |
| 3288 | |
| 3289 class PrintRegionClosure: public HeapRegionClosure { | |
| 3290 outputStream* _st; | |
| 3291 public: | |
| 3292 PrintRegionClosure(outputStream* st) : _st(st) {} | |
| 3293 bool doHeapRegion(HeapRegion* r) { | |
| 3294 r->print_on(_st); | |
| 3295 return false; | |
| 3296 } | |
| 3297 }; | |
| 3298 | |
| 3299 void G1CollectedHeap::print_on(outputStream* st) const { | |
|
838
0316eac49d5a
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|
3300 st->print(" %-20s", "garbage-first heap"); |
|
0316eac49d5a
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|
3301 st->print(" total " SIZE_FORMAT "K, used " SIZE_FORMAT "K", |
|
846
42d84bbbecf4
6859911: G1: assert(Heap_lock->owner() = NULL, "Should be owned on this thread's behalf")
tonyp
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|
3302 capacity()/K, used_unlocked()/K); |
|
838
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|
3303 st->print(" [" INTPTR_FORMAT ", " INTPTR_FORMAT ", " INTPTR_FORMAT ")", |
|
0316eac49d5a
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|
3304 _g1_storage.low_boundary(), |
|
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|
3305 _g1_storage.high(), |
|
0316eac49d5a
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|
3306 _g1_storage.high_boundary()); |
|
0316eac49d5a
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|
3307 st->cr(); |
|
3986
65a8ff39a6da
7095194: G1: HeapRegion::GrainBytes, GrainWords, and CardsPerRegion should be size_t
johnc
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3983
diff
changeset
|
3308 st->print(" region size " SIZE_FORMAT "K, ", HeapRegion::GrainBytes / K); |
|
6010
720b6a76dd9d
7157073: G1: type change size_t -> uint for region counts / indexes
tonyp
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|
3309 uint young_regions = _young_list->length(); |
|
720b6a76dd9d
7157073: G1: type change size_t -> uint for region counts / indexes
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|
3310 st->print("%u young (" SIZE_FORMAT "K), ", young_regions, |
|
720b6a76dd9d
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changeset
|
3311 (size_t) young_regions * HeapRegion::GrainBytes / K); |
|
720b6a76dd9d
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|
3312 uint survivor_regions = g1_policy()->recorded_survivor_regions(); |
|
720b6a76dd9d
7157073: G1: type change size_t -> uint for region counts / indexes
tonyp
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|
3313 st->print("%u survivors (" SIZE_FORMAT "K)", survivor_regions, |
|
720b6a76dd9d
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changeset
|
3314 (size_t) survivor_regions * HeapRegion::GrainBytes / K); |
|
838
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|
3315 st->cr(); |
|
0316eac49d5a
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|
3316 perm()->as_gen()->print_on(st); |
|
4073
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|
3317 } |
|
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|
3318 |
|
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|
3319 void G1CollectedHeap::print_extended_on(outputStream* st) const { |
|
53074c2c4600
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|
3320 print_on(st); |
|
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|
3321 |
|
53074c2c4600
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changeset
|
3322 // Print the per-region information. |
|
53074c2c4600
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|
3323 st->cr(); |
|
6010
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|
3324 st->print_cr("Heap Regions: (Y=young(eden), SU=young(survivor), " |
|
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changeset
|
3325 "HS=humongous(starts), HC=humongous(continues), " |
|
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changeset
|
3326 "CS=collection set, F=free, TS=gc time stamp, " |
|
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changeset
|
3327 "PTAMS=previous top-at-mark-start, " |
|
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changeset
|
3328 "NTAMS=next top-at-mark-start)"); |
| 342 | 3329 PrintRegionClosure blk(st); |
| 3766 | 3330 heap_region_iterate(&blk); |
| 342 | 3331 } |
| 3332 | |
| 3333 void G1CollectedHeap::print_gc_threads_on(outputStream* st) const { | |
|
1833
8b10f48633dc
6984287: Regularize how GC parallel workers are specified.
jmasa
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1755
diff
changeset
|
3334 if (G1CollectedHeap::use_parallel_gc_threads()) { |
| 1019 | 3335 workers()->print_worker_threads_on(st); |
| 3336 } | |
| 3337 _cmThread->print_on(st); | |
| 342 | 3338 st->cr(); |
| 1019 | 3339 _cm->print_worker_threads_on(st); |
| 3340 _cg1r->print_worker_threads_on(st); | |
| 342 | 3341 st->cr(); |
| 3342 } | |
| 3343 | |
| 3344 void G1CollectedHeap::gc_threads_do(ThreadClosure* tc) const { | |
|
1833
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diff
changeset
|
3345 if (G1CollectedHeap::use_parallel_gc_threads()) { |
| 342 | 3346 workers()->threads_do(tc); |
| 3347 } | |
| 3348 tc->do_thread(_cmThread); | |
| 794 | 3349 _cg1r->threads_do(tc); |
| 342 | 3350 } |
| 3351 | |
| 3352 void G1CollectedHeap::print_tracing_info() const { | |
| 3353 // We'll overload this to mean "trace GC pause statistics." | |
| 3354 if (TraceGen0Time || TraceGen1Time) { | |
| 3355 // The "G1CollectorPolicy" is keeping track of these stats, so delegate | |
| 3356 // to that. | |
| 3357 g1_policy()->print_tracing_info(); | |
| 3358 } | |
| 751 | 3359 if (G1SummarizeRSetStats) { |
| 342 | 3360 g1_rem_set()->print_summary_info(); |
| 3361 } | |
| 1282 | 3362 if (G1SummarizeConcMark) { |
| 342 | 3363 concurrent_mark()->print_summary_info(); |
| 3364 } | |
| 3365 g1_policy()->print_yg_surv_rate_info(); | |
| 3366 SpecializationStats::print(); | |
| 3367 } | |
| 3368 | |
|
3777
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|
3369 #ifndef PRODUCT |
|
e8b0b0392037
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diff
changeset
|
3370 // Helpful for debugging RSet issues. |
|
e8b0b0392037
7046182: G1: remove unnecessary iterations over the collection set
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changeset
|
3371 |
|
e8b0b0392037
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|
3372 class PrintRSetsClosure : public HeapRegionClosure { |
|
e8b0b0392037
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changeset
|
3373 private: |
|
e8b0b0392037
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diff
changeset
|
3374 const char* _msg; |
|
e8b0b0392037
7046182: G1: remove unnecessary iterations over the collection set
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3774
diff
changeset
|
3375 size_t _occupied_sum; |
|
e8b0b0392037
7046182: G1: remove unnecessary iterations over the collection set
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changeset
|
3376 |
|
e8b0b0392037
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changeset
|
3377 public: |
|
e8b0b0392037
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parents:
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diff
changeset
|
3378 bool doHeapRegion(HeapRegion* r) { |
|
e8b0b0392037
7046182: G1: remove unnecessary iterations over the collection set
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parents:
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diff
changeset
|
3379 HeapRegionRemSet* hrrs = r->rem_set(); |
|
e8b0b0392037
7046182: G1: remove unnecessary iterations over the collection set
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3774
diff
changeset
|
3380 size_t occupied = hrrs->occupied(); |
|
e8b0b0392037
7046182: G1: remove unnecessary iterations over the collection set
tonyp
parents:
3774
diff
changeset
|
3381 _occupied_sum += occupied; |
|
e8b0b0392037
7046182: G1: remove unnecessary iterations over the collection set
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parents:
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diff
changeset
|
3382 |
|
e8b0b0392037
7046182: G1: remove unnecessary iterations over the collection set
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diff
changeset
|
3383 gclog_or_tty->print_cr("Printing RSet for region "HR_FORMAT, |
|
e8b0b0392037
7046182: G1: remove unnecessary iterations over the collection set
tonyp
parents:
3774
diff
changeset
|
3384 HR_FORMAT_PARAMS(r)); |
|
e8b0b0392037
7046182: G1: remove unnecessary iterations over the collection set
tonyp
parents:
3774
diff
changeset
|
3385 if (occupied == 0) { |
|
e8b0b0392037
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tonyp
parents:
3774
diff
changeset
|
3386 gclog_or_tty->print_cr(" RSet is empty"); |
|
e8b0b0392037
7046182: G1: remove unnecessary iterations over the collection set
tonyp
parents:
3774
diff
changeset
|
3387 } else { |
|
e8b0b0392037
7046182: G1: remove unnecessary iterations over the collection set
tonyp
parents:
3774
diff
changeset
|
3388 hrrs->print(); |
|
e8b0b0392037
7046182: G1: remove unnecessary iterations over the collection set
tonyp
parents:
3774
diff
changeset
|
3389 } |
|
e8b0b0392037
7046182: G1: remove unnecessary iterations over the collection set
tonyp
parents:
3774
diff
changeset
|
3390 gclog_or_tty->print_cr("----------"); |
|
e8b0b0392037
7046182: G1: remove unnecessary iterations over the collection set
tonyp
parents:
3774
diff
changeset
|
3391 return false; |
|
e8b0b0392037
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tonyp
parents:
3774
diff
changeset
|
3392 } |
|
e8b0b0392037
7046182: G1: remove unnecessary iterations over the collection set
tonyp
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diff
changeset
|
3393 |
|
e8b0b0392037
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diff
changeset
|
3394 PrintRSetsClosure(const char* msg) : _msg(msg), _occupied_sum(0) { |
|
e8b0b0392037
7046182: G1: remove unnecessary iterations over the collection set
tonyp
parents:
3774
diff
changeset
|
3395 gclog_or_tty->cr(); |
|
e8b0b0392037
7046182: G1: remove unnecessary iterations over the collection set
tonyp
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diff
changeset
|
3396 gclog_or_tty->print_cr("========================================"); |
|
e8b0b0392037
7046182: G1: remove unnecessary iterations over the collection set
tonyp
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diff
changeset
|
3397 gclog_or_tty->print_cr(msg); |
|
e8b0b0392037
7046182: G1: remove unnecessary iterations over the collection set
tonyp
parents:
3774
diff
changeset
|
3398 gclog_or_tty->cr(); |
|
e8b0b0392037
7046182: G1: remove unnecessary iterations over the collection set
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diff
changeset
|
3399 } |
|
e8b0b0392037
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diff
changeset
|
3400 |
|
e8b0b0392037
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diff
changeset
|
3401 ~PrintRSetsClosure() { |
|
e8b0b0392037
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parents:
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diff
changeset
|
3402 gclog_or_tty->print_cr("Occupied Sum: "SIZE_FORMAT, _occupied_sum); |
|
e8b0b0392037
7046182: G1: remove unnecessary iterations over the collection set
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parents:
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diff
changeset
|
3403 gclog_or_tty->print_cr("========================================"); |
|
e8b0b0392037
7046182: G1: remove unnecessary iterations over the collection set
tonyp
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3774
diff
changeset
|
3404 gclog_or_tty->cr(); |
|
e8b0b0392037
7046182: G1: remove unnecessary iterations over the collection set
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parents:
3774
diff
changeset
|
3405 } |
|
e8b0b0392037
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parents:
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diff
changeset
|
3406 }; |
|
e8b0b0392037
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diff
changeset
|
3407 |
|
e8b0b0392037
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diff
changeset
|
3408 void G1CollectedHeap::print_cset_rsets() { |
|
e8b0b0392037
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diff
changeset
|
3409 PrintRSetsClosure cl("Printing CSet RSets"); |
|
e8b0b0392037
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tonyp
parents:
3774
diff
changeset
|
3410 collection_set_iterate(&cl); |
|
e8b0b0392037
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diff
changeset
|
3411 } |
|
e8b0b0392037
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|
3412 |
|
e8b0b0392037
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|
3413 void G1CollectedHeap::print_all_rsets() { |
|
e8b0b0392037
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diff
changeset
|
3414 PrintRSetsClosure cl("Printing All RSets");; |
|
e8b0b0392037
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diff
changeset
|
3415 heap_region_iterate(&cl); |
|
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changeset
|
3416 } |
|
e8b0b0392037
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|
3417 #endif // PRODUCT |
|
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|
3418 |
| 342 | 3419 G1CollectedHeap* G1CollectedHeap::heap() { |
| 3420 assert(_sh->kind() == CollectedHeap::G1CollectedHeap, | |
| 3421 "not a garbage-first heap"); | |
| 3422 return _g1h; | |
| 3423 } | |
| 3424 | |
| 3425 void G1CollectedHeap::gc_prologue(bool full /* Ignored */) { | |
|
1245
6484c4ee11cb
6904516: More object array barrier fixes, following up on 6906727
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1166
diff
changeset
|
3426 // always_do_update_barrier = false; |
| 342 | 3427 assert(InlineCacheBuffer::is_empty(), "should have cleaned up ICBuffer"); |
| 3428 // Call allocation profiler | |
| 3429 AllocationProfiler::iterate_since_last_gc(); | |
| 3430 // Fill TLAB's and such | |
| 3431 ensure_parsability(true); | |
| 3432 } | |
| 3433 | |
| 3434 void G1CollectedHeap::gc_epilogue(bool full /* Ignored */) { | |
| 3435 // FIXME: what is this about? | |
| 3436 // I'm ignoring the "fill_newgen()" call if "alloc_event_enabled" | |
| 3437 // is set. | |
| 3438 COMPILER2_PRESENT(assert(DerivedPointerTable::is_empty(), | |
| 3439 "derived pointer present")); | |
|
1245
6484c4ee11cb
6904516: More object array barrier fixes, following up on 6906727
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parents:
1166
diff
changeset
|
3440 // always_do_update_barrier = true; |
|
3979
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3441 |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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3973
diff
changeset
|
3442 // We have just completed a GC. Update the soft reference |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3443 // policy with the new heap occupancy |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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3973
diff
changeset
|
3444 Universe::update_heap_info_at_gc(); |
| 342 | 3445 } |
| 3446 | |
| 1973 | 3447 HeapWord* G1CollectedHeap::do_collection_pause(size_t word_size, |
| 3448 unsigned int gc_count_before, | |
| 3449 bool* succeeded) { | |
| 3450 assert_heap_not_locked_and_not_at_safepoint(); | |
| 342 | 3451 g1_policy()->record_stop_world_start(); |
| 1973 | 3452 VM_G1IncCollectionPause op(gc_count_before, |
| 3453 word_size, | |
| 3454 false, /* should_initiate_conc_mark */ | |
| 3455 g1_policy()->max_pause_time_ms(), | |
| 3456 GCCause::_g1_inc_collection_pause); | |
| 3457 VMThread::execute(&op); | |
| 3458 | |
| 3459 HeapWord* result = op.result(); | |
| 3460 bool ret_succeeded = op.prologue_succeeded() && op.pause_succeeded(); | |
| 3461 assert(result == NULL || ret_succeeded, | |
| 3462 "the result should be NULL if the VM did not succeed"); | |
| 3463 *succeeded = ret_succeeded; | |
| 3464 | |
| 3465 assert_heap_not_locked(); | |
| 3466 return result; | |
| 342 | 3467 } |
| 3468 | |
| 3469 void | |
| 3470 G1CollectedHeap::doConcurrentMark() { | |
|
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|
3471 MutexLockerEx x(CGC_lock, Mutex::_no_safepoint_check_flag); |
|
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|
3472 if (!_cmThread->in_progress()) { |
|
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|
3473 _cmThread->set_started(); |
|
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diff
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|
3474 CGC_lock->notify(); |
| 342 | 3475 } |
| 3476 } | |
| 3477 | |
| 3478 size_t G1CollectedHeap::pending_card_num() { | |
| 3479 size_t extra_cards = 0; | |
| 3480 JavaThread *curr = Threads::first(); | |
| 3481 while (curr != NULL) { | |
| 3482 DirtyCardQueue& dcq = curr->dirty_card_queue(); | |
| 3483 extra_cards += dcq.size(); | |
| 3484 curr = curr->next(); | |
| 3485 } | |
| 3486 DirtyCardQueueSet& dcqs = JavaThread::dirty_card_queue_set(); | |
| 3487 size_t buffer_size = dcqs.buffer_size(); | |
| 3488 size_t buffer_num = dcqs.completed_buffers_num(); | |
| 3489 return buffer_size * buffer_num + extra_cards; | |
| 3490 } | |
| 3491 | |
| 3492 size_t G1CollectedHeap::max_pending_card_num() { | |
| 3493 DirtyCardQueueSet& dcqs = JavaThread::dirty_card_queue_set(); | |
| 3494 size_t buffer_size = dcqs.buffer_size(); | |
| 3495 size_t buffer_num = dcqs.completed_buffers_num(); | |
| 3496 int thread_num = Threads::number_of_threads(); | |
| 3497 return (buffer_num + thread_num) * buffer_size; | |
| 3498 } | |
| 3499 | |
| 3500 size_t G1CollectedHeap::cards_scanned() { | |
| 1861 | 3501 return g1_rem_set()->cardsScanned(); |
| 342 | 3502 } |
| 3503 | |
| 3504 void | |
| 3505 G1CollectedHeap::setup_surviving_young_words() { | |
|
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|
3506 assert(_surviving_young_words == NULL, "pre-condition"); |
|
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|
3507 uint array_length = g1_policy()->young_cset_region_length(); |
|
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|
3508 _surviving_young_words = NEW_C_HEAP_ARRAY(size_t, (size_t) array_length); |
| 342 | 3509 if (_surviving_young_words == NULL) { |
| 3510 vm_exit_out_of_memory(sizeof(size_t) * array_length, | |
| 3511 "Not enough space for young surv words summary."); | |
| 3512 } | |
|
6010
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diff
changeset
|
3513 memset(_surviving_young_words, 0, (size_t) array_length * sizeof(size_t)); |
|
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|
3514 #ifdef ASSERT |
|
6010
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|
3515 for (uint i = 0; i < array_length; ++i) { |
|
845
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|
3516 assert( _surviving_young_words[i] == 0, "memset above" ); |
|
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|
3517 } |
|
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|
3518 #endif // !ASSERT |
| 342 | 3519 } |
| 3520 | |
| 3521 void | |
| 3522 G1CollectedHeap::update_surviving_young_words(size_t* surv_young_words) { | |
| 3523 MutexLockerEx x(ParGCRareEvent_lock, Mutex::_no_safepoint_check_flag); | |
|
6010
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diff
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|
3524 uint array_length = g1_policy()->young_cset_region_length(); |
|
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|
3525 for (uint i = 0; i < array_length; ++i) { |
| 342 | 3526 _surviving_young_words[i] += surv_young_words[i]; |
|
6010
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diff
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|
3527 } |
| 342 | 3528 } |
| 3529 | |
| 3530 void | |
| 3531 G1CollectedHeap::cleanup_surviving_young_words() { | |
| 3532 guarantee( _surviving_young_words != NULL, "pre-condition" ); | |
| 3533 FREE_C_HEAP_ARRAY(size_t, _surviving_young_words); | |
| 3534 _surviving_young_words = NULL; | |
| 3535 } | |
| 3536 | |
|
3777
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|
3537 #ifdef ASSERT |
|
e8b0b0392037
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changeset
|
3538 class VerifyCSetClosure: public HeapRegionClosure { |
|
e8b0b0392037
7046182: G1: remove unnecessary iterations over the collection set
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diff
changeset
|
3539 public: |
|
e8b0b0392037
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diff
changeset
|
3540 bool doHeapRegion(HeapRegion* hr) { |
|
e8b0b0392037
7046182: G1: remove unnecessary iterations over the collection set
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parents:
3774
diff
changeset
|
3541 // Here we check that the CSet region's RSet is ready for parallel |
|
e8b0b0392037
7046182: G1: remove unnecessary iterations over the collection set
tonyp
parents:
3774
diff
changeset
|
3542 // iteration. The fields that we'll verify are only manipulated |
|
e8b0b0392037
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tonyp
parents:
3774
diff
changeset
|
3543 // 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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parents:
3774
diff
changeset
|
3544 // we reset these fields when we clear the region's RSet (when the |
|
e8b0b0392037
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diff
changeset
|
3545 // region is freed) so they are ready when the region is |
|
e8b0b0392037
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diff
changeset
|
3546 // re-allocated. The only exception to this is if there's an |
|
e8b0b0392037
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3774
diff
changeset
|
3547 // evacuation failure and instead of freeing the region we leave |
|
e8b0b0392037
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3774
diff
changeset
|
3548 // it in the heap. In that case, we reset these fields during |
|
e8b0b0392037
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3774
diff
changeset
|
3549 // evacuation failure handling. |
|
e8b0b0392037
7046182: G1: remove unnecessary iterations over the collection set
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diff
changeset
|
3550 guarantee(hr->rem_set()->verify_ready_for_par_iteration(), "verification"); |
|
e8b0b0392037
7046182: G1: remove unnecessary iterations over the collection set
tonyp
parents:
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diff
changeset
|
3551 |
|
e8b0b0392037
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tonyp
parents:
3774
diff
changeset
|
3552 // Here's a good place to add any other checks we'd like to |
|
e8b0b0392037
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tonyp
parents:
3774
diff
changeset
|
3553 // perform on CSet regions. |
|
1261
0414c1049f15
6923991: G1: improve scalability of RSet scanning
iveresov
parents:
1245
diff
changeset
|
3554 return false; |
|
0414c1049f15
6923991: G1: improve scalability of RSet scanning
iveresov
parents:
1245
diff
changeset
|
3555 } |
|
0414c1049f15
6923991: G1: improve scalability of RSet scanning
iveresov
parents:
1245
diff
changeset
|
3556 }; |
|
3777
e8b0b0392037
7046182: G1: remove unnecessary iterations over the collection set
tonyp
parents:
3774
diff
changeset
|
3557 #endif // ASSERT |
|
1261
0414c1049f15
6923991: G1: improve scalability of RSet scanning
iveresov
parents:
1245
diff
changeset
|
3558 |
| 1709 | 3559 #if TASKQUEUE_STATS |
| 3560 void G1CollectedHeap::print_taskqueue_stats_hdr(outputStream* const st) { | |
| 3561 st->print_raw_cr("GC Task Stats"); | |
| 3562 st->print_raw("thr "); TaskQueueStats::print_header(1, st); st->cr(); | |
| 3563 st->print_raw("--- "); TaskQueueStats::print_header(2, st); st->cr(); | |
| 3564 } | |
| 3565 | |
| 3566 void G1CollectedHeap::print_taskqueue_stats(outputStream* const st) const { | |
| 3567 print_taskqueue_stats_hdr(st); | |
| 3568 | |
| 3569 TaskQueueStats totals; | |
|
1755
8e5955ddf8e4
6978300: G1: debug builds crash if ParallelGCThreads==0
jcoomes
parents:
1719
diff
changeset
|
3570 const int n = workers() != NULL ? workers()->total_workers() : 1; |
| 1709 | 3571 for (int i = 0; i < n; ++i) { |
| 3572 st->print("%3d ", i); task_queue(i)->stats.print(st); st->cr(); | |
| 3573 totals += task_queue(i)->stats; | |
| 3574 } | |
| 3575 st->print_raw("tot "); totals.print(st); st->cr(); | |
| 3576 | |
| 3577 DEBUG_ONLY(totals.verify()); | |
| 3578 } | |
| 3579 | |
| 3580 void G1CollectedHeap::reset_taskqueue_stats() { | |
|
1755
8e5955ddf8e4
6978300: G1: debug builds crash if ParallelGCThreads==0
jcoomes
parents:
1719
diff
changeset
|
3581 const int n = workers() != NULL ? workers()->total_workers() : 1; |
| 1709 | 3582 for (int i = 0; i < n; ++i) { |
| 3583 task_queue(i)->stats.reset(); | |
| 3584 } | |
| 3585 } | |
| 3586 #endif // TASKQUEUE_STATS | |
| 3587 | |
| 1973 | 3588 bool |
|
1656
4e5661ba9d98
6944166: G1: explicit GCs are not always handled correctly
tonyp
parents:
1611
diff
changeset
|
3589 G1CollectedHeap::do_collection_pause_at_safepoint(double target_pause_time_ms) { |
| 2152 | 3590 assert_at_safepoint(true /* should_be_vm_thread */); |
| 3591 guarantee(!is_gc_active(), "collection is not reentrant"); | |
| 3592 | |
|
1359
23b1b27ac76c
6909756: G1: guarantee(G1CollectedHeap::heap()->mark_in_progress(),"Precondition.")
tonyp
parents:
1313
diff
changeset
|
3593 if (GC_locker::check_active_before_gc()) { |
| 1973 | 3594 return false; |
|
1359
23b1b27ac76c
6909756: G1: guarantee(G1CollectedHeap::heap()->mark_in_progress(),"Precondition.")
tonyp
parents:
1313
diff
changeset
|
3595 } |
|
23b1b27ac76c
6909756: G1: guarantee(G1CollectedHeap::heap()->mark_in_progress(),"Precondition.")
tonyp
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1313
diff
changeset
|
3596 |
|
2125
7246a374a9f2
6458402: 3 jvmti tests fail with CMS and +ExplicitGCInvokesConcurrent
kamg
parents:
2039
diff
changeset
|
3597 SvcGCMarker sgcm(SvcGCMarker::MINOR); |
|
2039
7c5250dbd584
6896624: G1: hotspot:::gc and hotspot:::mem-pool-gc probes are not fired
tonyp
parents:
2038
diff
changeset
|
3598 ResourceMark rm; |
|
7c5250dbd584
6896624: G1: hotspot:::gc and hotspot:::mem-pool-gc probes are not fired
tonyp
parents:
2038
diff
changeset
|
3599 |
|
4872
aa3d708d67c4
7141200: log some interesting information in ring buffers for crashes
never
parents:
4787
diff
changeset
|
3600 print_heap_before_gc(); |
|
838
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
parents:
811
diff
changeset
|
3601 |
| 4072 | 3602 HRSPhaseSetter x(HRSPhaseEvacuation); |
| 2152 | 3603 verify_region_sets_optional(); |
|
2433
abdfc822206f
7023069: G1: Introduce symmetric locking in the slow allocation path
tonyp
parents:
2432
diff
changeset
|
3604 verify_dirty_young_regions(); |
| 2152 | 3605 |
|
4831
7ca7be5a6a0b
7129271: G1: Interference from multiple threads in PrintGC/PrintGCDetails output
johnc
parents:
4829
diff
changeset
|
3606 // This call will decide whether this pause is an initial-mark |
|
7ca7be5a6a0b
7129271: G1: Interference from multiple threads in PrintGC/PrintGCDetails output
johnc
parents:
4829
diff
changeset
|
3607 // pause. If it is, during_initial_mark_pause() will return true |
|
7ca7be5a6a0b
7129271: G1: Interference from multiple threads in PrintGC/PrintGCDetails output
johnc
parents:
4829
diff
changeset
|
3608 // for the duration of this pause. |
|
7ca7be5a6a0b
7129271: G1: Interference from multiple threads in PrintGC/PrintGCDetails output
johnc
parents:
4829
diff
changeset
|
3609 g1_policy()->decide_on_conc_mark_initiation(); |
|
7ca7be5a6a0b
7129271: G1: Interference from multiple threads in PrintGC/PrintGCDetails output
johnc
parents:
4829
diff
changeset
|
3610 |
|
7ca7be5a6a0b
7129271: G1: Interference from multiple threads in PrintGC/PrintGCDetails output
johnc
parents:
4829
diff
changeset
|
3611 // We do not allow initial-mark to be piggy-backed on a mixed GC. |
|
7ca7be5a6a0b
7129271: G1: Interference from multiple threads in PrintGC/PrintGCDetails output
johnc
parents:
4829
diff
changeset
|
3612 assert(!g1_policy()->during_initial_mark_pause() || |
|
7ca7be5a6a0b
7129271: G1: Interference from multiple threads in PrintGC/PrintGCDetails output
johnc
parents:
4829
diff
changeset
|
3613 g1_policy()->gcs_are_young(), "sanity"); |
|
7ca7be5a6a0b
7129271: G1: Interference from multiple threads in PrintGC/PrintGCDetails output
johnc
parents:
4829
diff
changeset
|
3614 |
|
7ca7be5a6a0b
7129271: G1: Interference from multiple threads in PrintGC/PrintGCDetails output
johnc
parents:
4829
diff
changeset
|
3615 // We also do not allow mixed GCs during marking. |
|
7ca7be5a6a0b
7129271: G1: Interference from multiple threads in PrintGC/PrintGCDetails output
johnc
parents:
4829
diff
changeset
|
3616 assert(!mark_in_progress() || g1_policy()->gcs_are_young(), "sanity"); |
|
7ca7be5a6a0b
7129271: G1: Interference from multiple threads in PrintGC/PrintGCDetails output
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parents:
4829
diff
changeset
|
3617 |
|
7ca7be5a6a0b
7129271: G1: Interference from multiple threads in PrintGC/PrintGCDetails output
johnc
parents:
4829
diff
changeset
|
3618 // Record whether this pause is an initial mark. When the current |
|
7ca7be5a6a0b
7129271: G1: Interference from multiple threads in PrintGC/PrintGCDetails output
johnc
parents:
4829
diff
changeset
|
3619 // thread has completed its logging output and it's safe to signal |
|
7ca7be5a6a0b
7129271: G1: Interference from multiple threads in PrintGC/PrintGCDetails output
johnc
parents:
4829
diff
changeset
|
3620 // the CM thread, the flag's value in the policy has been reset. |
|
7ca7be5a6a0b
7129271: G1: Interference from multiple threads in PrintGC/PrintGCDetails output
johnc
parents:
4829
diff
changeset
|
3621 bool should_start_conc_mark = g1_policy()->during_initial_mark_pause(); |
|
7ca7be5a6a0b
7129271: G1: Interference from multiple threads in PrintGC/PrintGCDetails output
johnc
parents:
4829
diff
changeset
|
3622 |
|
7ca7be5a6a0b
7129271: G1: Interference from multiple threads in PrintGC/PrintGCDetails output
johnc
parents:
4829
diff
changeset
|
3623 // Inner scope for scope based logging, timers, and stats collection |
|
838
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
parents:
811
diff
changeset
|
3624 { |
|
1656
4e5661ba9d98
6944166: G1: explicit GCs are not always handled correctly
tonyp
parents:
1611
diff
changeset
|
3625 if (g1_policy()->during_initial_mark_pause()) { |
|
4e5661ba9d98
6944166: G1: explicit GCs are not always handled correctly
tonyp
parents:
1611
diff
changeset
|
3626 // 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
|
3627 // full collection counter. |
|
6120
37552638d24a
7172388: G1: _total_full_collections should not be incremented for concurrent cycles
brutisso
parents:
6109
diff
changeset
|
3628 increment_old_marking_cycles_started(); |
|
1656
4e5661ba9d98
6944166: G1: explicit GCs are not always handled correctly
tonyp
parents:
1611
diff
changeset
|
3629 } |
|
6007
5c86f8211d1e
7160728: Introduce an extra logging level for G1 logging
brutisso
parents:
5987
diff
changeset
|
3630 // if the log level is "finer" is on, we'll print long statistics information |
|
838
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
parents:
811
diff
changeset
|
3631 // 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
|
3632 // is messy if we do. |
|
6007
5c86f8211d1e
7160728: Introduce an extra logging level for G1 logging
brutisso
parents:
5987
diff
changeset
|
3633 gclog_or_tty->date_stamp(G1Log::fine() && PrintGCDateStamps); |
|
5c86f8211d1e
7160728: Introduce an extra logging level for G1 logging
brutisso
parents:
5987
diff
changeset
|
3634 TraceCPUTime tcpu(G1Log::finer(), true, gclog_or_tty); |
| 6030 | 3635 |
|
6064
9d679effd28c
7166894: Add gc cause to GC logging for all collectors
brutisso
parents:
6059
diff
changeset
|
3636 GCCauseString gc_cause_str = GCCauseString("GC pause", gc_cause()) |
|
9d679effd28c
7166894: Add gc cause to GC logging for all collectors
brutisso
parents:
6059
diff
changeset
|
3637 .append(g1_policy()->gcs_are_young() ? " (young)" : " (mixed)") |
|
9d679effd28c
7166894: Add gc cause to GC logging for all collectors
brutisso
parents:
6059
diff
changeset
|
3638 .append(g1_policy()->during_initial_mark_pause() ? " (initial-mark)" : ""); |
|
9d679effd28c
7166894: Add gc cause to GC logging for all collectors
brutisso
parents:
6059
diff
changeset
|
3639 TraceTime t(gc_cause_str, G1Log::fine() && !G1Log::finer(), true, gclog_or_tty); |
|
838
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
parents:
811
diff
changeset
|
3640 |
|
3289
b52782ae3880
6946417: G1: Java VisualVM does not support G1 properly.
jmasa
parents:
3285
diff
changeset
|
3641 TraceCollectorStats tcs(g1mm()->incremental_collection_counters()); |
|
3356
78542e2b5e35
7036199: Adding a notification to the implementation of GarbageCollectorMXBeans
fparain
parents:
3323
diff
changeset
|
3642 TraceMemoryManagerStats tms(false /* fullGC */, gc_cause()); |
|
1089
db0d5eba9d20
6815790: G1: Missing MemoryPoolMXBeans with -XX:+UseG1GC
tonyp
parents:
1088
diff
changeset
|
3643 |
| 2361 | 3644 // If the secondary_free_list is not empty, append it to the |
| 3645 // free_list. No need to wait for the cleanup operation to finish; | |
| 3646 // the region allocation code will check the secondary_free_list | |
| 3647 // and wait if necessary. If the G1StressConcRegionFreeing flag is | |
| 3648 // set, skip this step so that the region allocation code has to | |
| 3649 // get entries from the secondary_free_list. | |
| 2152 | 3650 if (!G1StressConcRegionFreeing) { |
| 2361 | 3651 append_secondary_free_list_if_not_empty_with_lock(); |
| 2152 | 3652 } |
|
838
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
parents:
811
diff
changeset
|
3653 |
|
3867
ff53346271fe
6814390: G1: remove the concept of non-generational G1
brutisso
parents:
3830
diff
changeset
|
3654 assert(check_young_list_well_formed(), |
|
ff53346271fe
6814390: G1: remove the concept of non-generational G1
brutisso
parents:
3830
diff
changeset
|
3655 "young list should be well formed"); |
|
838
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
parents:
811
diff
changeset
|
3656 |
|
4095
bca17e38de00
6593758: RFE: Enhance GC ergonomics to dynamically choose ParallelGCThreads
jmasa
parents:
4090
diff
changeset
|
3657 // 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
|
3658 // 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
|
3659 // it will be set. |
|
bca17e38de00
6593758: RFE: Enhance GC ergonomics to dynamically choose ParallelGCThreads
jmasa
parents:
4090
diff
changeset
|
3660 |
|
838
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
parents:
811
diff
changeset
|
3661 { // 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
|
3662 IsGCActiveMark x; |
|
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
parents:
811
diff
changeset
|
3663 |
|
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
parents:
811
diff
changeset
|
3664 gc_prologue(false); |
|
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
parents:
811
diff
changeset
|
3665 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
|
3666 increment_gc_time_stamp(); |
| 342 | 3667 |
|
838
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
parents:
811
diff
changeset
|
3668 if (VerifyBeforeGC && total_collections() >= VerifyGCStartAt) { |
|
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
parents:
811
diff
changeset
|
3669 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
|
3670 gclog_or_tty->print(" VerifyBeforeGC:"); |
|
838
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
parents:
811
diff
changeset
|
3671 prepare_for_verify(); |
| 6008 | 3672 Universe::verify(/* silent */ false, |
|
3772
6747fd0512e0
7004681: G1: Extend marking verification to Full GCs
johnc
parents:
3766
diff
changeset
|
3673 /* option */ VerifyOption_G1UsePrevMarking); |
|
838
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
parents:
811
diff
changeset
|
3674 } |
|
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
parents:
811
diff
changeset
|
3675 |
|
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
parents:
811
diff
changeset
|
3676 COMPILER2_PRESENT(DerivedPointerTable::clear()); |
|
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
parents:
811
diff
changeset
|
3677 |
|
3979
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3678 // Please see comment in g1CollectedHeap.hpp and |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3679 // G1CollectedHeap::ref_processing_init() to see how |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3680 // reference processing currently works in G1. |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3681 |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3682 // Enable discovery in the STW reference processor |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3683 ref_processor_stw()->enable_discovery(true /*verify_disabled*/, |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3684 true /*verify_no_refs*/); |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3685 |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3686 { |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3687 // We want to temporarily turn off discovery by the |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3688 // CM ref processor, if necessary, and turn it back on |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3689 // on again later if we do. Using a scoped |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3690 // NoRefDiscovery object will do this. |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3691 NoRefDiscovery no_cm_discovery(ref_processor_cm()); |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3692 |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3693 // 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
|
3694 // of the collection set!). |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3695 release_mutator_alloc_region(); |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3696 |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3697 // We should call this after we retire the mutator alloc |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3698 // region(s) so that all the ALLOC / RETIRE events are generated |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3699 // before the start GC event. |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3700 _hr_printer.start_gc(false /* full */, (size_t) total_collections()); |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3701 |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3702 // The elapsed time induced by the start time below deliberately elides |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3703 // the possible verification above. |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3704 double start_time_sec = os::elapsedTime(); |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3705 size_t start_used_bytes = used(); |
|
838
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
parents:
811
diff
changeset
|
3706 |
|
1394
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
3707 #if YOUNG_LIST_VERBOSE |
|
3979
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3708 gclog_or_tty->print_cr("\nBefore recording pause start.\nYoung_list:"); |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3709 _young_list->print(); |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3710 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
|
3711 #endif // YOUNG_LIST_VERBOSE |
|
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
3712 |
|
3979
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3713 g1_policy()->record_collection_pause_start(start_time_sec, |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3714 start_used_bytes); |
|
838
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
parents:
811
diff
changeset
|
3715 |
|
4837
eff609af17d7
7127706: G1: re-enable survivors during the initial-mark pause
tonyp
parents:
4836
diff
changeset
|
3716 double scan_wait_start = os::elapsedTime(); |
|
eff609af17d7
7127706: G1: re-enable survivors during the initial-mark pause
tonyp
parents:
4836
diff
changeset
|
3717 // We have to wait until the CM threads finish scanning the |
|
eff609af17d7
7127706: G1: re-enable survivors during the initial-mark pause
tonyp
parents:
4836
diff
changeset
|
3718 // root regions as it's the only way to ensure that all the |
|
eff609af17d7
7127706: G1: re-enable survivors during the initial-mark pause
tonyp
parents:
4836
diff
changeset
|
3719 // objects on them have been correctly scanned before we start |
|
eff609af17d7
7127706: G1: re-enable survivors during the initial-mark pause
tonyp
parents:
4836
diff
changeset
|
3720 // moving them during the GC. |
|
eff609af17d7
7127706: G1: re-enable survivors during the initial-mark pause
tonyp
parents:
4836
diff
changeset
|
3721 bool waited = _cm->root_regions()->wait_until_scan_finished(); |
|
eff609af17d7
7127706: G1: re-enable survivors during the initial-mark pause
tonyp
parents:
4836
diff
changeset
|
3722 if (waited) { |
|
eff609af17d7
7127706: G1: re-enable survivors during the initial-mark pause
tonyp
parents:
4836
diff
changeset
|
3723 double scan_wait_end = os::elapsedTime(); |
|
eff609af17d7
7127706: G1: re-enable survivors during the initial-mark pause
tonyp
parents:
4836
diff
changeset
|
3724 double wait_time_ms = (scan_wait_end - scan_wait_start) * 1000.0; |
|
eff609af17d7
7127706: G1: re-enable survivors during the initial-mark pause
tonyp
parents:
4836
diff
changeset
|
3725 g1_policy()->record_root_region_scan_wait_time(wait_time_ms); |
|
eff609af17d7
7127706: G1: re-enable survivors during the initial-mark pause
tonyp
parents:
4836
diff
changeset
|
3726 } |
|
eff609af17d7
7127706: G1: re-enable survivors during the initial-mark pause
tonyp
parents:
4836
diff
changeset
|
3727 |
|
1394
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
3728 #if YOUNG_LIST_VERBOSE |
|
3979
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3729 gclog_or_tty->print_cr("\nAfter recording pause start.\nYoung_list:"); |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3730 _young_list->print(); |
|
1394
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
3731 #endif // YOUNG_LIST_VERBOSE |
| 342 | 3732 |
|
3979
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3733 if (g1_policy()->during_initial_mark_pause()) { |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3734 concurrent_mark()->checkpointRootsInitialPre(); |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3735 } |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3736 perm_gen()->save_marks(); |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3737 |
|
1394
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
3738 #if YOUNG_LIST_VERBOSE |
|
3979
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3739 gclog_or_tty->print_cr("\nBefore choosing collection set.\nYoung_list:"); |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3740 _young_list->print(); |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3741 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
|
3742 #endif // YOUNG_LIST_VERBOSE |
|
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
3743 |
|
4912
a9647476d1a4
7132029: G1: mixed GC phase lasts for longer than it should
tonyp
parents:
4910
diff
changeset
|
3744 g1_policy()->finalize_cset(target_pause_time_ms); |
|
3979
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3745 |
|
4787
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
4785
diff
changeset
|
3746 _cm->note_start_of_gc(); |
|
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
4785
diff
changeset
|
3747 // 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
|
3748 // we have not filtered them yet (we'll do so during the |
|
4912
a9647476d1a4
7132029: G1: mixed GC phase lasts for longer than it should
tonyp
parents:
4910
diff
changeset
|
3749 // GC). We also call this after finalize_cset() to |
|
4787
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
4785
diff
changeset
|
3750 // ensure that the CSet has been finalized. |
|
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
4785
diff
changeset
|
3751 _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
|
3752 true /* verify_enqueued_buffers */, |
|
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
4785
diff
changeset
|
3753 false /* verify_thread_buffers */, |
|
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
4785
diff
changeset
|
3754 true /* verify_fingers */); |
|
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
4785
diff
changeset
|
3755 |
|
3979
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3756 if (_hr_printer.is_active()) { |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3757 HeapRegion* hr = g1_policy()->collection_set(); |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3758 while (hr != NULL) { |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3759 G1HRPrinter::RegionType type; |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3760 if (!hr->is_young()) { |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3761 type = G1HRPrinter::Old; |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3762 } else if (hr->is_survivor()) { |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3763 type = G1HRPrinter::Survivor; |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3764 } else { |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3765 type = G1HRPrinter::Eden; |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3766 } |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3767 _hr_printer.cset(hr); |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3768 hr = hr->next_in_collection_set(); |
|
3778
5f6f2615433a
7049999: G1: Make the G1PrintHeapRegions output consistent and complete
tonyp
parents:
3777
diff
changeset
|
3769 } |
|
5f6f2615433a
7049999: G1: Make the G1PrintHeapRegions output consistent and complete
tonyp
parents:
3777
diff
changeset
|
3770 } |
|
3979
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3771 |
|
3777
e8b0b0392037
7046182: G1: remove unnecessary iterations over the collection set
tonyp
parents:
3774
diff
changeset
|
3772 #ifdef ASSERT |
|
3979
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3773 VerifyCSetClosure cl; |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3774 collection_set_iterate(&cl); |
|
3777
e8b0b0392037
7046182: G1: remove unnecessary iterations over the collection set
tonyp
parents:
3774
diff
changeset
|
3775 #endif // ASSERT |
| 1707 | 3776 |
|
3979
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3777 setup_surviving_young_words(); |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3778 |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3779 // Initialize the GC alloc regions. |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3780 init_gc_alloc_regions(); |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3781 |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3782 // Actually do the work... |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3783 evacuate_collection_set(); |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3784 |
|
4787
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
4785
diff
changeset
|
3785 // 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
|
3786 // (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
|
3787 // 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
|
3788 // 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
|
3789 // we checked. |
|
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
4785
diff
changeset
|
3790 _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
|
3791 false /* verify_enqueued_buffers */, |
|
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
4785
diff
changeset
|
3792 true /* verify_thread_buffers */, |
|
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
4785
diff
changeset
|
3793 true /* verify_fingers */); |
|
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
4785
diff
changeset
|
3794 |
|
3979
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3795 free_collection_set(g1_policy()->collection_set()); |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3796 g1_policy()->clear_collection_set(); |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3797 |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3798 cleanup_surviving_young_words(); |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3799 |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3800 // Start a new incremental collection set for the next pause. |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3801 g1_policy()->start_incremental_cset_building(); |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3802 |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3803 // Clear the _cset_fast_test bitmap in anticipation of adding |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3804 // regions to the incremental collection set for the next |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3805 // evacuation pause. |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3806 clear_cset_fast_test(); |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3807 |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3808 _young_list->reset_sampled_info(); |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3809 |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3810 // Don't check the whole heap at this point as the |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3811 // GC alloc regions from this pause have been tagged |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3812 // as survivors and moved on to the survivor list. |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3813 // Survivor regions will fail the !is_young() check. |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3814 assert(check_young_list_empty(false /* check_heap */), |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3815 "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
|
3816 |
|
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
3817 #if YOUNG_LIST_VERBOSE |
|
3979
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3818 gclog_or_tty->print_cr("Before recording survivors.\nYoung List:"); |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3819 _young_list->print(); |
|
1394
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
3820 #endif // YOUNG_LIST_VERBOSE |
| 342 | 3821 |
|
3979
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3822 g1_policy()->record_survivor_regions(_young_list->survivor_length(), |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3823 _young_list->first_survivor_region(), |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3824 _young_list->last_survivor_region()); |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3825 |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3826 _young_list->reset_auxilary_lists(); |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3827 |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3828 if (evacuation_failed()) { |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3829 _summary_bytes_used = recalculate_used(); |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3830 } else { |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3831 // The "used" of the the collection set have already been subtracted |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3832 // when they were freed. Add in the bytes evacuated. |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3833 _summary_bytes_used += g1_policy()->bytes_copied_during_gc(); |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3834 } |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3835 |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3836 if (g1_policy()->during_initial_mark_pause()) { |
|
4837
eff609af17d7
7127706: G1: re-enable survivors during the initial-mark pause
tonyp
parents:
4836
diff
changeset
|
3837 // We have to do this before we notify the CM threads that |
|
eff609af17d7
7127706: G1: re-enable survivors during the initial-mark pause
tonyp
parents:
4836
diff
changeset
|
3838 // they can start working to make sure that all the |
|
eff609af17d7
7127706: G1: re-enable survivors during the initial-mark pause
tonyp
parents:
4836
diff
changeset
|
3839 // appropriate initialization is done on the CM object. |
|
3979
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3840 concurrent_mark()->checkpointRootsInitialPost(); |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3841 set_marking_started(); |
|
4831
7ca7be5a6a0b
7129271: G1: Interference from multiple threads in PrintGC/PrintGCDetails output
johnc
parents:
4829
diff
changeset
|
3842 // Note that we don't actually trigger the CM thread at |
|
7ca7be5a6a0b
7129271: G1: Interference from multiple threads in PrintGC/PrintGCDetails output
johnc
parents:
4829
diff
changeset
|
3843 // this point. We do that later when we're sure that |
|
7ca7be5a6a0b
7129271: G1: Interference from multiple threads in PrintGC/PrintGCDetails output
johnc
parents:
4829
diff
changeset
|
3844 // the current thread has completed its logging output. |
|
3979
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3845 } |
|
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 allocate_dummy_regions(); |
|
3285
49a67202bc67
7011855: G1: non-product flag to artificially grow the heap
tonyp
parents:
2433
diff
changeset
|
3848 |
|
1394
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
3849 #if YOUNG_LIST_VERBOSE |
|
3979
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3850 gclog_or_tty->print_cr("\nEnd of the pause.\nYoung_list:"); |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3851 _young_list->print(); |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3852 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
|
3853 #endif // YOUNG_LIST_VERBOSE |
| 342 | 3854 |
|
3979
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3855 init_mutator_alloc_region(); |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3856 |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3857 { |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3858 size_t expand_bytes = g1_policy()->expansion_amount(); |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3859 if (expand_bytes > 0) { |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3860 size_t bytes_before = capacity(); |
| 4785 | 3861 // No need for an ergo verbose message here, |
| 3862 // expansion_amount() does this when it returns a value > 0. | |
|
3979
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3863 if (!expand(expand_bytes)) { |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3864 // We failed to expand the heap so let's verify that |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3865 // committed/uncommitted amount match the backing store |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3866 assert(capacity() == _g1_storage.committed_size(), "committed size mismatch"); |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3867 assert(max_capacity() == _g1_storage.reserved_size(), "reserved size mismatch"); |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3868 } |
|
3920
af2ab04e0038
6929868: G1: introduce min / max young gen size bounds
brutisso
parents:
3919
diff
changeset
|
3869 } |
|
af2ab04e0038
6929868: G1: introduce min / max young gen size bounds
brutisso
parents:
3919
diff
changeset
|
3870 } |
|
3979
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3871 |
|
4787
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
4785
diff
changeset
|
3872 // 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
|
3873 // 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
|
3874 _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
|
3875 true /* verify_enqueued_buffers */, |
|
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
4785
diff
changeset
|
3876 true /* verify_thread_buffers */, |
|
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
4785
diff
changeset
|
3877 true /* verify_fingers */); |
|
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
4785
diff
changeset
|
3878 _cm->note_end_of_gc(); |
|
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
4785
diff
changeset
|
3879 |
|
3979
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3880 double end_time_sec = os::elapsedTime(); |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3881 double pause_time_ms = (end_time_sec - start_time_sec) * MILLIUNITS; |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3882 g1_policy()->record_pause_time_ms(pause_time_ms); |
| 4711 | 3883 int active_workers = (G1CollectedHeap::use_parallel_gc_threads() ? |
| 3884 workers()->active_workers() : 1); | |
| 3885 g1_policy()->record_collection_pause_end(active_workers); | |
|
3979
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3886 |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3887 MemoryService::track_memory_usage(); |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3888 |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3889 // 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
|
3890 // update buffers to bring the RSets up-to-date if |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3891 // G1HRRSFlushLogBuffersOnVerify has been set. While scanning |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3892 // 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
|
3893 // regions we just allocated to (i.e., the GC alloc |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3894 // regions). However, during the last GC we called |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3895 // set_saved_mark() on all the GC alloc regions, so card |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3896 // scanning might skip the [saved_mark_word()...top()] area of |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3897 // those regions (i.e., the area we allocated objects into |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3898 // during the last GC). But it shouldn't. Given that |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3899 // saved_mark_word() is conditional on whether the GC time stamp |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3900 // 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
|
3901 // 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
|
3902 // regions and saved_mark_word() will simply return top() for |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3903 // 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
|
3904 // than iterating over the regions and fixing them. In fact, the |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3905 // GC time stamp increment here also ensures that |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3906 // saved_mark_word() will return top() between pauses, i.e., |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3907 // during concurrent refinement. So we don't need the |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3908 // is_gc_active() check to decided which top to use when |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3909 // scanning cards (see CR 7039627). |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3910 increment_gc_time_stamp(); |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3911 |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3912 if (VerifyAfterGC && total_collections() >= VerifyGCStartAt) { |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3913 HandleMark hm; // Discard invalid handles created during verification |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3914 gclog_or_tty->print(" VerifyAfterGC:"); |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3915 prepare_for_verify(); |
| 6008 | 3916 Universe::verify(/* silent */ false, |
|
3979
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3917 /* option */ VerifyOption_G1UsePrevMarking); |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3918 } |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3919 |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3920 assert(!ref_processor_stw()->discovery_enabled(), "Postcondition"); |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3921 ref_processor_stw()->verify_no_references_recorded(); |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3922 |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3923 // 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
|
3924 } |
|
af2ab04e0038
6929868: G1: introduce min / max young gen size bounds
brutisso
parents:
3919
diff
changeset
|
3925 |
|
3778
5f6f2615433a
7049999: G1: Make the G1PrintHeapRegions output consistent and complete
tonyp
parents:
3777
diff
changeset
|
3926 // 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
|
3927 // 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
|
3928 // 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
|
3929 // RETIRE events are generated before the end GC event. |
|
5f6f2615433a
7049999: G1: Make the G1PrintHeapRegions output consistent and complete
tonyp
parents:
3777
diff
changeset
|
3930 _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
|
3931 |
|
3764
053d84a76d3d
7032531: G1: enhance GC logging to include more accurate eden / survivor size transitions
tonyp
parents:
3378
diff
changeset
|
3932 // 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
|
3933 g1_policy()->print_heap_transition(); |
|
838
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
parents:
811
diff
changeset
|
3934 |
|
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
parents:
811
diff
changeset
|
3935 if (mark_in_progress()) { |
|
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
parents:
811
diff
changeset
|
3936 concurrent_mark()->update_g1_committed(); |
|
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
parents:
811
diff
changeset
|
3937 } |
|
546
05c6d52fa7a9
6690928: Use spinning in combination with yields for workstealing termination.
jmasa
parents:
545
diff
changeset
|
3938 |
|
05c6d52fa7a9
6690928: Use spinning in combination with yields for workstealing termination.
jmasa
parents:
545
diff
changeset
|
3939 #ifdef TRACESPINNING |
|
838
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
parents:
811
diff
changeset
|
3940 ParallelTaskTerminator::print_termination_counts(); |
|
546
05c6d52fa7a9
6690928: Use spinning in combination with yields for workstealing termination.
jmasa
parents:
545
diff
changeset
|
3941 #endif |
| 342 | 3942 |
|
838
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
parents:
811
diff
changeset
|
3943 gc_epilogue(false); |
|
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
parents:
811
diff
changeset
|
3944 } |
|
6121
b9442ac22f59
7173460: G1: java/lang/management/MemoryMXBean/CollectionUsageThreshold.java failes with G1
brutisso
parents:
6120
diff
changeset
|
3945 |
|
b9442ac22f59
7173460: G1: java/lang/management/MemoryMXBean/CollectionUsageThreshold.java failes with G1
brutisso
parents:
6120
diff
changeset
|
3946 // The closing of the inner scope, immediately above, will complete |
|
b9442ac22f59
7173460: G1: java/lang/management/MemoryMXBean/CollectionUsageThreshold.java failes with G1
brutisso
parents:
6120
diff
changeset
|
3947 // logging at the "fine" level. The record_collection_pause_end() call |
|
b9442ac22f59
7173460: G1: java/lang/management/MemoryMXBean/CollectionUsageThreshold.java failes with G1
brutisso
parents:
6120
diff
changeset
|
3948 // above will complete logging at the "finer" level. |
|
b9442ac22f59
7173460: G1: java/lang/management/MemoryMXBean/CollectionUsageThreshold.java failes with G1
brutisso
parents:
6120
diff
changeset
|
3949 // |
|
b9442ac22f59
7173460: G1: java/lang/management/MemoryMXBean/CollectionUsageThreshold.java failes with G1
brutisso
parents:
6120
diff
changeset
|
3950 // It is not yet to safe, however, to tell the concurrent mark to |
|
b9442ac22f59
7173460: G1: java/lang/management/MemoryMXBean/CollectionUsageThreshold.java failes with G1
brutisso
parents:
6120
diff
changeset
|
3951 // start as we have some optional output below. We don't want the |
|
b9442ac22f59
7173460: G1: java/lang/management/MemoryMXBean/CollectionUsageThreshold.java failes with G1
brutisso
parents:
6120
diff
changeset
|
3952 // output from the concurrent mark thread interfering with this |
|
b9442ac22f59
7173460: G1: java/lang/management/MemoryMXBean/CollectionUsageThreshold.java failes with G1
brutisso
parents:
6120
diff
changeset
|
3953 // logging output either. |
|
b9442ac22f59
7173460: G1: java/lang/management/MemoryMXBean/CollectionUsageThreshold.java failes with G1
brutisso
parents:
6120
diff
changeset
|
3954 |
|
b9442ac22f59
7173460: G1: java/lang/management/MemoryMXBean/CollectionUsageThreshold.java failes with G1
brutisso
parents:
6120
diff
changeset
|
3955 _hrs.verify_optional(); |
|
b9442ac22f59
7173460: G1: java/lang/management/MemoryMXBean/CollectionUsageThreshold.java failes with G1
brutisso
parents:
6120
diff
changeset
|
3956 verify_region_sets_optional(); |
|
b9442ac22f59
7173460: G1: java/lang/management/MemoryMXBean/CollectionUsageThreshold.java failes with G1
brutisso
parents:
6120
diff
changeset
|
3957 |
|
b9442ac22f59
7173460: G1: java/lang/management/MemoryMXBean/CollectionUsageThreshold.java failes with G1
brutisso
parents:
6120
diff
changeset
|
3958 TASKQUEUE_STATS_ONLY(if (ParallelGCVerbose) print_taskqueue_stats()); |
|
b9442ac22f59
7173460: G1: java/lang/management/MemoryMXBean/CollectionUsageThreshold.java failes with G1
brutisso
parents:
6120
diff
changeset
|
3959 TASKQUEUE_STATS_ONLY(reset_taskqueue_stats()); |
|
b9442ac22f59
7173460: G1: java/lang/management/MemoryMXBean/CollectionUsageThreshold.java failes with G1
brutisso
parents:
6120
diff
changeset
|
3960 |
|
b9442ac22f59
7173460: G1: java/lang/management/MemoryMXBean/CollectionUsageThreshold.java failes with G1
brutisso
parents:
6120
diff
changeset
|
3961 print_heap_after_gc(); |
|
b9442ac22f59
7173460: G1: java/lang/management/MemoryMXBean/CollectionUsageThreshold.java failes with G1
brutisso
parents:
6120
diff
changeset
|
3962 |
|
b9442ac22f59
7173460: G1: java/lang/management/MemoryMXBean/CollectionUsageThreshold.java failes with G1
brutisso
parents:
6120
diff
changeset
|
3963 // We must call G1MonitoringSupport::update_sizes() in the same scoping level |
|
b9442ac22f59
7173460: G1: java/lang/management/MemoryMXBean/CollectionUsageThreshold.java failes with G1
brutisso
parents:
6120
diff
changeset
|
3964 // as an active TraceMemoryManagerStats object (i.e. before the destructor for the |
|
b9442ac22f59
7173460: G1: java/lang/management/MemoryMXBean/CollectionUsageThreshold.java failes with G1
brutisso
parents:
6120
diff
changeset
|
3965 // TraceMemoryManagerStats is called) so that the G1 memory pools are updated |
|
b9442ac22f59
7173460: G1: java/lang/management/MemoryMXBean/CollectionUsageThreshold.java failes with G1
brutisso
parents:
6120
diff
changeset
|
3966 // before any GC notifications are raised. |
|
b9442ac22f59
7173460: G1: java/lang/management/MemoryMXBean/CollectionUsageThreshold.java failes with G1
brutisso
parents:
6120
diff
changeset
|
3967 g1mm()->update_sizes(); |
|
b9442ac22f59
7173460: G1: java/lang/management/MemoryMXBean/CollectionUsageThreshold.java failes with G1
brutisso
parents:
6120
diff
changeset
|
3968 } |
|
3289
b52782ae3880
6946417: G1: Java VisualVM does not support G1 properly.
jmasa
parents:
3285
diff
changeset
|
3969 |
|
884
83b687ce3090
6866591: G1: print update buffer processing stats more often
tonyp
parents:
883
diff
changeset
|
3970 if (G1SummarizeRSetStats && |
|
83b687ce3090
6866591: G1: print update buffer processing stats more often
tonyp
parents:
883
diff
changeset
|
3971 (G1SummarizeRSetStatsPeriod > 0) && |
|
83b687ce3090
6866591: G1: print update buffer processing stats more often
tonyp
parents:
883
diff
changeset
|
3972 (total_collections() % G1SummarizeRSetStatsPeriod == 0)) { |
|
83b687ce3090
6866591: G1: print update buffer processing stats more often
tonyp
parents:
883
diff
changeset
|
3973 g1_rem_set()->print_summary_info(); |
|
83b687ce3090
6866591: G1: print update buffer processing stats more often
tonyp
parents:
883
diff
changeset
|
3974 } |
| 1973 | 3975 |
|
4831
7ca7be5a6a0b
7129271: G1: Interference from multiple threads in PrintGC/PrintGCDetails output
johnc
parents:
4829
diff
changeset
|
3976 // It should now be safe to tell the concurrent mark thread to start |
|
7ca7be5a6a0b
7129271: G1: Interference from multiple threads in PrintGC/PrintGCDetails output
johnc
parents:
4829
diff
changeset
|
3977 // without its logging output interfering with the logging output |
|
7ca7be5a6a0b
7129271: G1: Interference from multiple threads in PrintGC/PrintGCDetails output
johnc
parents:
4829
diff
changeset
|
3978 // that came from the pause. |
|
7ca7be5a6a0b
7129271: G1: Interference from multiple threads in PrintGC/PrintGCDetails output
johnc
parents:
4829
diff
changeset
|
3979 |
|
7ca7be5a6a0b
7129271: G1: Interference from multiple threads in PrintGC/PrintGCDetails output
johnc
parents:
4829
diff
changeset
|
3980 if (should_start_conc_mark) { |
|
7ca7be5a6a0b
7129271: G1: Interference from multiple threads in PrintGC/PrintGCDetails output
johnc
parents:
4829
diff
changeset
|
3981 // CAUTION: after the doConcurrentMark() call below, |
|
7ca7be5a6a0b
7129271: G1: Interference from multiple threads in PrintGC/PrintGCDetails output
johnc
parents:
4829
diff
changeset
|
3982 // the concurrent marking thread(s) could be running |
|
7ca7be5a6a0b
7129271: G1: Interference from multiple threads in PrintGC/PrintGCDetails output
johnc
parents:
4829
diff
changeset
|
3983 // concurrently with us. Make sure that anything after |
|
7ca7be5a6a0b
7129271: G1: Interference from multiple threads in PrintGC/PrintGCDetails output
johnc
parents:
4829
diff
changeset
|
3984 // this point does not assume that we are the only GC thread |
|
7ca7be5a6a0b
7129271: G1: Interference from multiple threads in PrintGC/PrintGCDetails output
johnc
parents:
4829
diff
changeset
|
3985 // running. Note: of course, the actual marking work will |
|
7ca7be5a6a0b
7129271: G1: Interference from multiple threads in PrintGC/PrintGCDetails output
johnc
parents:
4829
diff
changeset
|
3986 // not start until the safepoint itself is released in |
|
7ca7be5a6a0b
7129271: G1: Interference from multiple threads in PrintGC/PrintGCDetails output
johnc
parents:
4829
diff
changeset
|
3987 // ConcurrentGCThread::safepoint_desynchronize(). |
|
7ca7be5a6a0b
7129271: G1: Interference from multiple threads in PrintGC/PrintGCDetails output
johnc
parents:
4829
diff
changeset
|
3988 doConcurrentMark(); |
|
7ca7be5a6a0b
7129271: G1: Interference from multiple threads in PrintGC/PrintGCDetails output
johnc
parents:
4829
diff
changeset
|
3989 } |
|
7ca7be5a6a0b
7129271: G1: Interference from multiple threads in PrintGC/PrintGCDetails output
johnc
parents:
4829
diff
changeset
|
3990 |
| 1973 | 3991 return true; |
| 342 | 3992 } |
| 3993 | |
|
1391
79e419e5ea3b
6942253: G1: replace G1ParallelGCAllocBufferSize with YoungPLABSize and OldPLABSize
apetrusenko
parents:
1390
diff
changeset
|
3994 size_t G1CollectedHeap::desired_plab_sz(GCAllocPurpose purpose) |
|
79e419e5ea3b
6942253: G1: replace G1ParallelGCAllocBufferSize with YoungPLABSize and OldPLABSize
apetrusenko
parents:
1390
diff
changeset
|
3995 { |
|
79e419e5ea3b
6942253: G1: replace G1ParallelGCAllocBufferSize with YoungPLABSize and OldPLABSize
apetrusenko
parents:
1390
diff
changeset
|
3996 size_t gclab_word_size; |
|
79e419e5ea3b
6942253: G1: replace G1ParallelGCAllocBufferSize with YoungPLABSize and OldPLABSize
apetrusenko
parents:
1390
diff
changeset
|
3997 switch (purpose) { |
|
79e419e5ea3b
6942253: G1: replace G1ParallelGCAllocBufferSize with YoungPLABSize and OldPLABSize
apetrusenko
parents:
1390
diff
changeset
|
3998 case GCAllocForSurvived: |
|
79e419e5ea3b
6942253: G1: replace G1ParallelGCAllocBufferSize with YoungPLABSize and OldPLABSize
apetrusenko
parents:
1390
diff
changeset
|
3999 gclab_word_size = YoungPLABSize; |
|
79e419e5ea3b
6942253: G1: replace G1ParallelGCAllocBufferSize with YoungPLABSize and OldPLABSize
apetrusenko
parents:
1390
diff
changeset
|
4000 break; |
|
79e419e5ea3b
6942253: G1: replace G1ParallelGCAllocBufferSize with YoungPLABSize and OldPLABSize
apetrusenko
parents:
1390
diff
changeset
|
4001 case GCAllocForTenured: |
|
79e419e5ea3b
6942253: G1: replace G1ParallelGCAllocBufferSize with YoungPLABSize and OldPLABSize
apetrusenko
parents:
1390
diff
changeset
|
4002 gclab_word_size = OldPLABSize; |
|
79e419e5ea3b
6942253: G1: replace G1ParallelGCAllocBufferSize with YoungPLABSize and OldPLABSize
apetrusenko
parents:
1390
diff
changeset
|
4003 break; |
|
79e419e5ea3b
6942253: G1: replace G1ParallelGCAllocBufferSize with YoungPLABSize and OldPLABSize
apetrusenko
parents:
1390
diff
changeset
|
4004 default: |
|
79e419e5ea3b
6942253: G1: replace G1ParallelGCAllocBufferSize with YoungPLABSize and OldPLABSize
apetrusenko
parents:
1390
diff
changeset
|
4005 assert(false, "unknown GCAllocPurpose"); |
|
79e419e5ea3b
6942253: G1: replace G1ParallelGCAllocBufferSize with YoungPLABSize and OldPLABSize
apetrusenko
parents:
1390
diff
changeset
|
4006 gclab_word_size = OldPLABSize; |
|
79e419e5ea3b
6942253: G1: replace G1ParallelGCAllocBufferSize with YoungPLABSize and OldPLABSize
apetrusenko
parents:
1390
diff
changeset
|
4007 break; |
|
79e419e5ea3b
6942253: G1: replace G1ParallelGCAllocBufferSize with YoungPLABSize and OldPLABSize
apetrusenko
parents:
1390
diff
changeset
|
4008 } |
|
79e419e5ea3b
6942253: G1: replace G1ParallelGCAllocBufferSize with YoungPLABSize and OldPLABSize
apetrusenko
parents:
1390
diff
changeset
|
4009 return gclab_word_size; |
|
79e419e5ea3b
6942253: G1: replace G1ParallelGCAllocBufferSize with YoungPLABSize and OldPLABSize
apetrusenko
parents:
1390
diff
changeset
|
4010 } |
|
79e419e5ea3b
6942253: G1: replace G1ParallelGCAllocBufferSize with YoungPLABSize and OldPLABSize
apetrusenko
parents:
1390
diff
changeset
|
4011 |
|
2433
abdfc822206f
7023069: G1: Introduce symmetric locking in the slow allocation path
tonyp
parents:
2432
diff
changeset
|
4012 void G1CollectedHeap::init_mutator_alloc_region() { |
|
abdfc822206f
7023069: G1: Introduce symmetric locking in the slow allocation path
tonyp
parents:
2432
diff
changeset
|
4013 assert(_mutator_alloc_region.get() == NULL, "pre-condition"); |
|
abdfc822206f
7023069: G1: Introduce symmetric locking in the slow allocation path
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|
4014 _mutator_alloc_region.init(); |
|
abdfc822206f
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|
4015 } |
|
abdfc822206f
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|
4016 |
|
abdfc822206f
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|
4017 void G1CollectedHeap::release_mutator_alloc_region() { |
|
abdfc822206f
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|
4018 _mutator_alloc_region.release(); |
|
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|
4019 assert(_mutator_alloc_region.get() == NULL, "post-condition"); |
|
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|
4020 } |
|
1391
79e419e5ea3b
6942253: G1: replace G1ParallelGCAllocBufferSize with YoungPLABSize and OldPLABSize
apetrusenko
parents:
1390
diff
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|
4021 |
|
3830
f44782f04dd4
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|
4022 void G1CollectedHeap::init_gc_alloc_regions() { |
|
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|
4023 assert_at_safepoint(true /* should_be_vm_thread */); |
|
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|
4024 |
|
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|
4025 _survivor_gc_alloc_region.init(); |
|
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|
4026 _old_gc_alloc_region.init(); |
|
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|
4027 HeapRegion* retained_region = _retained_old_gc_alloc_region; |
|
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|
4028 _retained_old_gc_alloc_region = NULL; |
|
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|
4029 |
|
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|
4030 // We will discard the current GC alloc region if: |
|
f44782f04dd4
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|
4031 // a) it's in the collection set (it can happen!), |
|
f44782f04dd4
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|
4032 // b) it's already full (no point in using it), |
|
f44782f04dd4
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|
4033 // c) it's empty (this means that it was emptied during |
|
f44782f04dd4
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|
4034 // a cleanup and it should be on the free list now), or |
|
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|
4035 // d) it's humongous (this means that it was emptied |
|
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|
4036 // during a cleanup and was added to the free list, but |
|
f44782f04dd4
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|
4037 // has been subseqently used to allocate a humongous |
|
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|
4038 // object that may be less than the region size). |
|
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|
4039 if (retained_region != NULL && |
|
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7039627: G1: avoid BOT updates for survivor allocations and dirty survivor regions incrementally
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|
4040 !retained_region->in_collection_set() && |
|
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|
4041 !(retained_region->top() == retained_region->end()) && |
|
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|
4042 !retained_region->is_empty() && |
|
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|
4043 !retained_region->isHumongous()) { |
|
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|
4044 retained_region->set_saved_mark(); |
| 4072 | 4045 // The retained region was added to the old region set when it was |
| 4046 // retired. We have to remove it now, since we don't allow regions | |
| 4047 // we allocate to in the region sets. We'll re-add it later, when | |
| 4048 // it's retired again. | |
| 4049 _old_set.remove(retained_region); | |
|
4787
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6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
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changeset
|
4050 bool during_im = g1_policy()->during_initial_mark_pause(); |
|
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
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|
4051 retained_region->note_start_of_copying(during_im); |
|
3830
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|
4052 _old_gc_alloc_region.set(retained_region); |
|
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|
4053 _hr_printer.reuse(retained_region); |
| 342 | 4054 } |
| 4055 } | |
| 4056 | |
|
3830
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|
4057 void G1CollectedHeap::release_gc_alloc_regions() { |
|
f44782f04dd4
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|
4058 _survivor_gc_alloc_region.release(); |
|
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|
4059 // If we have an old GC alloc region to release, we'll save it in |
|
f44782f04dd4
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|
4060 // _retained_old_gc_alloc_region. If we don't |
|
f44782f04dd4
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|
4061 // _retained_old_gc_alloc_region will become NULL. This is what we |
|
f44782f04dd4
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changeset
|
4062 // want either way so no reason to check explicitly for either |
|
f44782f04dd4
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|
4063 // condition. |
|
f44782f04dd4
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changeset
|
4064 _retained_old_gc_alloc_region = _old_gc_alloc_region.release(); |
| 342 | 4065 } |
| 4066 | |
|
3830
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|
4067 void G1CollectedHeap::abandon_gc_alloc_regions() { |
|
f44782f04dd4
7039627: G1: avoid BOT updates for survivor allocations and dirty survivor regions incrementally
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|
4068 assert(_survivor_gc_alloc_region.get() == NULL, "pre-condition"); |
|
f44782f04dd4
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|
4069 assert(_old_gc_alloc_region.get() == NULL, "pre-condition"); |
|
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|
4070 _retained_old_gc_alloc_region = NULL; |
| 342 | 4071 } |
| 4072 | |
| 4073 void G1CollectedHeap::init_for_evac_failure(OopsInHeapRegionClosure* cl) { | |
| 4074 _drain_in_progress = false; | |
| 4075 set_evac_failure_closure(cl); | |
| 4076 _evac_failure_scan_stack = new (ResourceObj::C_HEAP) GrowableArray<oop>(40, true); | |
| 4077 } | |
| 4078 | |
| 4079 void G1CollectedHeap::finalize_for_evac_failure() { | |
| 4080 assert(_evac_failure_scan_stack != NULL && | |
| 4081 _evac_failure_scan_stack->length() == 0, | |
| 4082 "Postcondition"); | |
| 4083 assert(!_drain_in_progress, "Postcondition"); | |
| 1045 | 4084 delete _evac_failure_scan_stack; |
| 342 | 4085 _evac_failure_scan_stack = NULL; |
| 4086 } | |
| 4087 | |
| 4088 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
|
4089 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
|
4090 |
|
023652e49ac0
7121496: G1: do the per-region evacuation failure handling work in parallel
johnc
parents:
4781
diff
changeset
|
4091 G1ParRemoveSelfForwardPtrsTask rsfp_task(this); |
|
023652e49ac0
7121496: G1: do the per-region evacuation failure handling work in parallel
johnc
parents:
4781
diff
changeset
|
4092 |
|
023652e49ac0
7121496: G1: do the per-region evacuation failure handling work in parallel
johnc
parents:
4781
diff
changeset
|
4093 if (G1CollectedHeap::use_parallel_gc_threads()) { |
|
023652e49ac0
7121496: G1: do the per-region evacuation failure handling work in parallel
johnc
parents:
4781
diff
changeset
|
4094 set_par_threads(); |
|
023652e49ac0
7121496: G1: do the per-region evacuation failure handling work in parallel
johnc
parents:
4781
diff
changeset
|
4095 workers()->run_task(&rsfp_task); |
|
023652e49ac0
7121496: G1: do the per-region evacuation failure handling work in parallel
johnc
parents:
4781
diff
changeset
|
4096 set_par_threads(0); |
|
616
4f360ec815ba
6720309: G1: don't synchronously update RSet during evacuation pauses
iveresov
parents:
595
diff
changeset
|
4097 } else { |
|
4783
023652e49ac0
7121496: G1: do the per-region evacuation failure handling work in parallel
johnc
parents:
4781
diff
changeset
|
4098 rsfp_task.work(0); |
|
023652e49ac0
7121496: G1: do the per-region evacuation failure handling work in parallel
johnc
parents:
4781
diff
changeset
|
4099 } |
|
023652e49ac0
7121496: G1: do the per-region evacuation failure handling work in parallel
johnc
parents:
4781
diff
changeset
|
4100 |
|
023652e49ac0
7121496: G1: do the per-region evacuation failure handling work in parallel
johnc
parents:
4781
diff
changeset
|
4101 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
|
4102 |
|
023652e49ac0
7121496: G1: do the per-region evacuation failure handling work in parallel
johnc
parents:
4781
diff
changeset
|
4103 // 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
|
4104 reset_cset_heap_region_claim_values(); |
|
023652e49ac0
7121496: G1: do the per-region evacuation failure handling work in parallel
johnc
parents:
4781
diff
changeset
|
4105 |
|
023652e49ac0
7121496: G1: do the per-region evacuation failure handling work in parallel
johnc
parents:
4781
diff
changeset
|
4106 assert(check_cset_heap_region_claim_values(HeapRegion::InitialClaimValue), "sanity"); |
| 342 | 4107 |
| 4108 // Now restore saved marks, if any. | |
| 4109 if (_objs_with_preserved_marks != NULL) { | |
| 4110 assert(_preserved_marks_of_objs != NULL, "Both or none."); | |
| 4111 guarantee(_objs_with_preserved_marks->length() == | |
| 4112 _preserved_marks_of_objs->length(), "Both or none."); | |
| 4113 for (int i = 0; i < _objs_with_preserved_marks->length(); i++) { | |
| 4114 oop obj = _objs_with_preserved_marks->at(i); | |
| 4115 markOop m = _preserved_marks_of_objs->at(i); | |
| 4116 obj->set_mark(m); | |
| 4117 } | |
|
4783
023652e49ac0
7121496: G1: do the per-region evacuation failure handling work in parallel
johnc
parents:
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changeset
|
4118 |
| 342 | 4119 // Delete the preserved marks growable arrays (allocated on the C heap). |
| 4120 delete _objs_with_preserved_marks; | |
| 4121 delete _preserved_marks_of_objs; | |
| 4122 _objs_with_preserved_marks = NULL; | |
| 4123 _preserved_marks_of_objs = NULL; | |
| 4124 } | |
| 4125 } | |
| 4126 | |
| 4127 void G1CollectedHeap::push_on_evac_failure_scan_stack(oop obj) { | |
| 4128 _evac_failure_scan_stack->push(obj); | |
| 4129 } | |
| 4130 | |
| 4131 void G1CollectedHeap::drain_evac_failure_scan_stack() { | |
| 4132 assert(_evac_failure_scan_stack != NULL, "precondition"); | |
| 4133 | |
| 4134 while (_evac_failure_scan_stack->length() > 0) { | |
| 4135 oop obj = _evac_failure_scan_stack->pop(); | |
| 4136 _evac_failure_closure->set_region(heap_region_containing(obj)); | |
| 4137 obj->oop_iterate_backwards(_evac_failure_closure); | |
| 4138 } | |
| 4139 } | |
| 4140 | |
| 4141 oop | |
| 4142 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
|
4143 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
|
4144 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
|
4145 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 ...
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parents:
3317
diff
changeset
|
4146 (HeapWord*) old)); |
| 342 | 4147 markOop m = old->mark(); |
| 4148 oop forward_ptr = old->forward_to_atomic(old); | |
| 4149 if (forward_ptr == NULL) { | |
| 4150 // 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
|
4151 |
| 342 | 4152 if (_evac_failure_closure != cl) { |
| 4153 MutexLockerEx x(EvacFailureStack_lock, Mutex::_no_safepoint_check_flag); | |
| 4154 assert(!_drain_in_progress, | |
| 4155 "Should only be true while someone holds the lock."); | |
| 4156 // Set the global evac-failure closure to the current thread's. | |
| 4157 assert(_evac_failure_closure == NULL, "Or locking has failed."); | |
| 4158 set_evac_failure_closure(cl); | |
| 4159 // Now do the common part. | |
| 4160 handle_evacuation_failure_common(old, m); | |
| 4161 // Reset to NULL. | |
| 4162 set_evac_failure_closure(NULL); | |
| 4163 } else { | |
| 4164 // The lock is already held, and this is recursive. | |
| 4165 assert(_drain_in_progress, "This should only be the recursive case."); | |
| 4166 handle_evacuation_failure_common(old, m); | |
| 4167 } | |
| 4168 return old; | |
| 4169 } else { | |
|
3323
75af3e8de182
7040450: G1: assert((_g1->evacuation_failed()) || (!_g1->obj_in_cs(obj))) failed: shouldn't still be in ...
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3317
diff
changeset
|
4170 // 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 ...
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3317
diff
changeset
|
4171 // 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 ...
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3317
diff
changeset
|
4172 // 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
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3317
diff
changeset
|
4173 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
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3317
diff
changeset
|
4174 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 ...
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3317
diff
changeset
|
4175 "should not be in the CSet", |
|
75af3e8de182
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3317
diff
changeset
|
4176 (HeapWord*) old, (HeapWord*) forward_ptr)); |
| 342 | 4177 return forward_ptr; |
| 4178 } | |
| 4179 } | |
| 4180 | |
| 4181 void G1CollectedHeap::handle_evacuation_failure_common(oop old, markOop m) { | |
| 4182 set_evacuation_failed(true); | |
| 4183 | |
| 4184 preserve_mark_if_necessary(old, m); | |
| 4185 | |
| 4186 HeapRegion* r = heap_region_containing(old); | |
| 4187 if (!r->evacuation_failed()) { | |
| 4188 r->set_evacuation_failed(true); | |
|
3778
5f6f2615433a
7049999: G1: Make the G1PrintHeapRegions output consistent and complete
tonyp
parents:
3777
diff
changeset
|
4189 _hr_printer.evac_failure(r); |
| 342 | 4190 } |
| 4191 | |
| 4192 push_on_evac_failure_scan_stack(old); | |
| 4193 | |
| 4194 if (!_drain_in_progress) { | |
| 4195 // prevent recursion in copy_to_survivor_space() | |
| 4196 _drain_in_progress = true; | |
| 4197 drain_evac_failure_scan_stack(); | |
| 4198 _drain_in_progress = false; | |
| 4199 } | |
| 4200 } | |
| 4201 | |
| 4202 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
|
4203 assert(evacuation_failed(), "Oversaving!"); |
|
74ee0db180fa
6807801: CMS: could save/restore fewer header words during scavenge
ysr
parents:
2037
diff
changeset
|
4204 // 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
|
4205 // case of a promotion failure. |
|
74ee0db180fa
6807801: CMS: could save/restore fewer header words during scavenge
ysr
parents:
2037
diff
changeset
|
4206 if (m->must_be_preserved_for_promotion_failure(obj)) { |
| 342 | 4207 if (_objs_with_preserved_marks == NULL) { |
| 4208 assert(_preserved_marks_of_objs == NULL, "Both or none."); | |
| 4209 _objs_with_preserved_marks = | |
| 4210 new (ResourceObj::C_HEAP) GrowableArray<oop>(40, true); | |
| 4211 _preserved_marks_of_objs = | |
| 4212 new (ResourceObj::C_HEAP) GrowableArray<markOop>(40, true); | |
| 4213 } | |
| 4214 _objs_with_preserved_marks->push(obj); | |
| 4215 _preserved_marks_of_objs->push(m); | |
| 4216 } | |
| 4217 } | |
| 4218 | |
| 4219 HeapWord* G1CollectedHeap::par_allocate_during_gc(GCAllocPurpose purpose, | |
| 4220 size_t word_size) { | |
|
3830
f44782f04dd4
7039627: G1: avoid BOT updates for survivor allocations and dirty survivor regions incrementally
tonyp
parents:
3824
diff
changeset
|
4221 if (purpose == GCAllocForSurvived) { |
|
f44782f04dd4
7039627: G1: avoid BOT updates for survivor allocations and dirty survivor regions incrementally
tonyp
parents:
3824
diff
changeset
|
4222 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
|
4223 if (result != NULL) { |
|
f44782f04dd4
7039627: G1: avoid BOT updates for survivor allocations and dirty survivor regions incrementally
tonyp
parents:
3824
diff
changeset
|
4224 return result; |
| 342 | 4225 } else { |
|
3830
f44782f04dd4
7039627: G1: avoid BOT updates for survivor allocations and dirty survivor regions incrementally
tonyp
parents:
3824
diff
changeset
|
4226 // 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
|
4227 // object there. |
|
f44782f04dd4
7039627: G1: avoid BOT updates for survivor allocations and dirty survivor regions incrementally
tonyp
parents:
3824
diff
changeset
|
4228 return old_attempt_allocation(word_size); |
| 342 | 4229 } |
|
3830
f44782f04dd4
7039627: G1: avoid BOT updates for survivor allocations and dirty survivor regions incrementally
tonyp
parents:
3824
diff
changeset
|
4230 } else { |
|
f44782f04dd4
7039627: G1: avoid BOT updates for survivor allocations and dirty survivor regions incrementally
tonyp
parents:
3824
diff
changeset
|
4231 assert(purpose == GCAllocForTenured, "sanity"); |
|
f44782f04dd4
7039627: G1: avoid BOT updates for survivor allocations and dirty survivor regions incrementally
tonyp
parents:
3824
diff
changeset
|
4232 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
|
4233 if (result != NULL) { |
|
f44782f04dd4
7039627: G1: avoid BOT updates for survivor allocations and dirty survivor regions incrementally
tonyp
parents:
3824
diff
changeset
|
4234 return result; |
| 342 | 4235 } else { |
|
3830
f44782f04dd4
7039627: G1: avoid BOT updates for survivor allocations and dirty survivor regions incrementally
tonyp
parents:
3824
diff
changeset
|
4236 // 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
|
4237 // object there. |
|
f44782f04dd4
7039627: G1: avoid BOT updates for survivor allocations and dirty survivor regions incrementally
tonyp
parents:
3824
diff
changeset
|
4238 return survivor_attempt_allocation(word_size); |
| 342 | 4239 } |
|
3830
f44782f04dd4
7039627: G1: avoid BOT updates for survivor allocations and dirty survivor regions incrementally
tonyp
parents:
3824
diff
changeset
|
4240 } |
|
f44782f04dd4
7039627: G1: avoid BOT updates for survivor allocations and dirty survivor regions incrementally
tonyp
parents:
3824
diff
changeset
|
4241 |
|
f44782f04dd4
7039627: G1: avoid BOT updates for survivor allocations and dirty survivor regions incrementally
tonyp
parents:
3824
diff
changeset
|
4242 ShouldNotReachHere(); |
|
f44782f04dd4
7039627: G1: avoid BOT updates for survivor allocations and dirty survivor regions incrementally
tonyp
parents:
3824
diff
changeset
|
4243 // 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
|
4244 return NULL; |
| 342 | 4245 } |
| 4246 | |
|
3886
eeae91c9baba
7080389: G1: refactor marking code in evacuation pause copy closures
johnc
parents:
3869
diff
changeset
|
4247 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
|
4248 ParGCAllocBuffer(gclab_word_size), _retired(false) { } |
|
3886
eeae91c9baba
7080389: G1: refactor marking code in evacuation pause copy closures
johnc
parents:
3869
diff
changeset
|
4249 |
|
4836
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4834
diff
changeset
|
4250 G1ParScanThreadState::G1ParScanThreadState(G1CollectedHeap* g1h, uint queue_num) |
|
845
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
ysr
parents:
838
diff
changeset
|
4251 : _g1h(g1h), |
|
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
ysr
parents:
838
diff
changeset
|
4252 _refs(g1h->task_queue(queue_num)), |
|
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
ysr
parents:
838
diff
changeset
|
4253 _dcq(&g1h->dirty_card_queue_set()), |
|
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
ysr
parents:
838
diff
changeset
|
4254 _ct_bs((CardTableModRefBS*)_g1h->barrier_set()), |
|
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
ysr
parents:
838
diff
changeset
|
4255 _g1_rem(g1h->g1_rem_set()), |
|
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
ysr
parents:
838
diff
changeset
|
4256 _hash_seed(17), _queue_num(queue_num), |
|
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
ysr
parents:
838
diff
changeset
|
4257 _term_attempts(0), |
|
1391
79e419e5ea3b
6942253: G1: replace G1ParallelGCAllocBufferSize with YoungPLABSize and OldPLABSize
apetrusenko
parents:
1390
diff
changeset
|
4258 _surviving_alloc_buffer(g1h->desired_plab_sz(GCAllocForSurvived)), |
|
79e419e5ea3b
6942253: G1: replace G1ParallelGCAllocBufferSize with YoungPLABSize and OldPLABSize
apetrusenko
parents:
1390
diff
changeset
|
4259 _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
|
4260 _age_table(false), |
|
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
ysr
parents:
838
diff
changeset
|
4261 _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
|
4262 _alloc_buffer_waste(0), _undo_waste(0) { |
|
845
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
ysr
parents:
838
diff
changeset
|
4263 // we allocate G1YoungSurvRateNumRegions plus one entries, since |
|
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
ysr
parents:
838
diff
changeset
|
4264 // 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
|
4265 // non-young regions (where the age is -1) |
|
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
ysr
parents:
838
diff
changeset
|
4266 // 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
|
4267 // an attempt to eliminate cache contention |
|
6010
720b6a76dd9d
7157073: G1: type change size_t -> uint for region counts / indexes
tonyp
parents:
6008
diff
changeset
|
4268 uint real_length = 1 + _g1h->g1_policy()->young_cset_region_length(); |
|
720b6a76dd9d
7157073: G1: type change size_t -> uint for region counts / indexes
tonyp
parents:
6008
diff
changeset
|
4269 uint array_length = PADDING_ELEM_NUM + |
|
720b6a76dd9d
7157073: G1: type change size_t -> uint for region counts / indexes
tonyp
parents:
6008
diff
changeset
|
4270 real_length + |
|
720b6a76dd9d
7157073: G1: type change size_t -> uint for region counts / indexes
tonyp
parents:
6008
diff
changeset
|
4271 PADDING_ELEM_NUM; |
|
845
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
ysr
parents:
838
diff
changeset
|
4272 _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
|
4273 if (_surviving_young_words_base == NULL) |
|
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
ysr
parents:
838
diff
changeset
|
4274 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
|
4275 "Not enough space for young surv histo."); |
|
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
ysr
parents:
838
diff
changeset
|
4276 _surviving_young_words = _surviving_young_words_base + PADDING_ELEM_NUM; |
|
6010
720b6a76dd9d
7157073: G1: type change size_t -> uint for region counts / indexes
tonyp
parents:
6008
diff
changeset
|
4277 memset(_surviving_young_words, 0, (size_t) real_length * sizeof(size_t)); |
|
845
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
ysr
parents:
838
diff
changeset
|
4278 |
|
1391
79e419e5ea3b
6942253: G1: replace G1ParallelGCAllocBufferSize with YoungPLABSize and OldPLABSize
apetrusenko
parents:
1390
diff
changeset
|
4279 _alloc_buffers[GCAllocForSurvived] = &_surviving_alloc_buffer; |
|
79e419e5ea3b
6942253: G1: replace G1ParallelGCAllocBufferSize with YoungPLABSize and OldPLABSize
apetrusenko
parents:
1390
diff
changeset
|
4280 _alloc_buffers[GCAllocForTenured] = &_tenured_alloc_buffer; |
|
79e419e5ea3b
6942253: G1: replace G1ParallelGCAllocBufferSize with YoungPLABSize and OldPLABSize
apetrusenko
parents:
1390
diff
changeset
|
4281 |
|
845
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
ysr
parents:
838
diff
changeset
|
4282 _start = os::elapsedTime(); |
|
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
ysr
parents:
838
diff
changeset
|
4283 } |
| 342 | 4284 |
| 1709 | 4285 void |
| 4286 G1ParScanThreadState::print_termination_stats_hdr(outputStream* const st) | |
| 4287 { | |
| 4288 st->print_raw_cr("GC Termination Stats"); | |
| 4289 st->print_raw_cr(" elapsed --strong roots-- -------termination-------" | |
| 4290 " ------waste (KiB)------"); | |
| 4291 st->print_raw_cr("thr ms ms % ms % attempts" | |
| 4292 " total alloc undo"); | |
| 4293 st->print_raw_cr("--- --------- --------- ------ --------- ------ --------" | |
| 4294 " ------- ------- -------"); | |
| 4295 } | |
| 4296 | |
| 4297 void | |
| 4298 G1ParScanThreadState::print_termination_stats(int i, | |
| 4299 outputStream* const st) const | |
| 4300 { | |
| 4301 const double elapsed_ms = elapsed_time() * 1000.0; | |
| 4302 const double s_roots_ms = strong_roots_time() * 1000.0; | |
| 4303 const double term_ms = term_time() * 1000.0; | |
| 4304 st->print_cr("%3d %9.2f %9.2f %6.2f " | |
| 4305 "%9.2f %6.2f " SIZE_FORMAT_W(8) " " | |
| 4306 SIZE_FORMAT_W(7) " " SIZE_FORMAT_W(7) " " SIZE_FORMAT_W(7), | |
| 4307 i, elapsed_ms, s_roots_ms, s_roots_ms * 100 / elapsed_ms, | |
| 4308 term_ms, term_ms * 100 / elapsed_ms, term_attempts(), | |
| 4309 (alloc_buffer_waste() + undo_waste()) * HeapWordSize / K, | |
| 4310 alloc_buffer_waste() * HeapWordSize / K, | |
| 4311 undo_waste() * HeapWordSize / K); | |
| 4312 } | |
| 4313 | |
|
1862
b14ec34b1e07
6989448: G1: refactor and simplify G1ParScanThreadState
jcoomes
parents:
1861
diff
changeset
|
4314 #ifdef ASSERT |
|
b14ec34b1e07
6989448: G1: refactor and simplify G1ParScanThreadState
jcoomes
parents:
1861
diff
changeset
|
4315 bool G1ParScanThreadState::verify_ref(narrowOop* ref) const { |
|
b14ec34b1e07
6989448: G1: refactor and simplify G1ParScanThreadState
jcoomes
parents:
1861
diff
changeset
|
4316 assert(ref != NULL, "invariant"); |
|
b14ec34b1e07
6989448: G1: refactor and simplify G1ParScanThreadState
jcoomes
parents:
1861
diff
changeset
|
4317 assert(UseCompressedOops, "sanity"); |
|
b14ec34b1e07
6989448: G1: refactor and simplify G1ParScanThreadState
jcoomes
parents:
1861
diff
changeset
|
4318 assert(!has_partial_array_mask(ref), err_msg("ref=" PTR_FORMAT, ref)); |
|
b14ec34b1e07
6989448: G1: refactor and simplify G1ParScanThreadState
jcoomes
parents:
1861
diff
changeset
|
4319 oop p = oopDesc::load_decode_heap_oop(ref); |
|
b14ec34b1e07
6989448: G1: refactor and simplify G1ParScanThreadState
jcoomes
parents:
1861
diff
changeset
|
4320 assert(_g1h->is_in_g1_reserved(p), |
|
b14ec34b1e07
6989448: G1: refactor and simplify G1ParScanThreadState
jcoomes
parents:
1861
diff
changeset
|
4321 err_msg("ref=" PTR_FORMAT " p=" PTR_FORMAT, ref, intptr_t(p))); |
|
b14ec34b1e07
6989448: G1: refactor and simplify G1ParScanThreadState
jcoomes
parents:
1861
diff
changeset
|
4322 return true; |
|
b14ec34b1e07
6989448: G1: refactor and simplify G1ParScanThreadState
jcoomes
parents:
1861
diff
changeset
|
4323 } |
|
b14ec34b1e07
6989448: G1: refactor and simplify G1ParScanThreadState
jcoomes
parents:
1861
diff
changeset
|
4324 |
|
b14ec34b1e07
6989448: G1: refactor and simplify G1ParScanThreadState
jcoomes
parents:
1861
diff
changeset
|
4325 bool G1ParScanThreadState::verify_ref(oop* ref) const { |
|
b14ec34b1e07
6989448: G1: refactor and simplify G1ParScanThreadState
jcoomes
parents:
1861
diff
changeset
|
4326 assert(ref != NULL, "invariant"); |
|
b14ec34b1e07
6989448: G1: refactor and simplify G1ParScanThreadState
jcoomes
parents:
1861
diff
changeset
|
4327 if (has_partial_array_mask(ref)) { |
|
b14ec34b1e07
6989448: G1: refactor and simplify G1ParScanThreadState
jcoomes
parents:
1861
diff
changeset
|
4328 // Must be in the collection set--it's already been copied. |
|
b14ec34b1e07
6989448: G1: refactor and simplify G1ParScanThreadState
jcoomes
parents:
1861
diff
changeset
|
4329 oop p = clear_partial_array_mask(ref); |
|
b14ec34b1e07
6989448: G1: refactor and simplify G1ParScanThreadState
jcoomes
parents:
1861
diff
changeset
|
4330 assert(_g1h->obj_in_cs(p), |
|
b14ec34b1e07
6989448: G1: refactor and simplify G1ParScanThreadState
jcoomes
parents:
1861
diff
changeset
|
4331 err_msg("ref=" PTR_FORMAT " p=" PTR_FORMAT, ref, intptr_t(p))); |
|
b14ec34b1e07
6989448: G1: refactor and simplify G1ParScanThreadState
jcoomes
parents:
1861
diff
changeset
|
4332 } else { |
|
b14ec34b1e07
6989448: G1: refactor and simplify G1ParScanThreadState
jcoomes
parents:
1861
diff
changeset
|
4333 oop p = oopDesc::load_decode_heap_oop(ref); |
|
b14ec34b1e07
6989448: G1: refactor and simplify G1ParScanThreadState
jcoomes
parents:
1861
diff
changeset
|
4334 assert(_g1h->is_in_g1_reserved(p), |
|
b14ec34b1e07
6989448: G1: refactor and simplify G1ParScanThreadState
jcoomes
parents:
1861
diff
changeset
|
4335 err_msg("ref=" PTR_FORMAT " p=" PTR_FORMAT, ref, intptr_t(p))); |
|
b14ec34b1e07
6989448: G1: refactor and simplify G1ParScanThreadState
jcoomes
parents:
1861
diff
changeset
|
4336 } |
|
b14ec34b1e07
6989448: G1: refactor and simplify G1ParScanThreadState
jcoomes
parents:
1861
diff
changeset
|
4337 return true; |
|
b14ec34b1e07
6989448: G1: refactor and simplify G1ParScanThreadState
jcoomes
parents:
1861
diff
changeset
|
4338 } |
|
b14ec34b1e07
6989448: G1: refactor and simplify G1ParScanThreadState
jcoomes
parents:
1861
diff
changeset
|
4339 |
|
b14ec34b1e07
6989448: G1: refactor and simplify G1ParScanThreadState
jcoomes
parents:
1861
diff
changeset
|
4340 bool G1ParScanThreadState::verify_task(StarTask ref) const { |
|
b14ec34b1e07
6989448: G1: refactor and simplify G1ParScanThreadState
jcoomes
parents:
1861
diff
changeset
|
4341 if (ref.is_narrow()) { |
|
b14ec34b1e07
6989448: G1: refactor and simplify G1ParScanThreadState
jcoomes
parents:
1861
diff
changeset
|
4342 return verify_ref((narrowOop*) ref); |
|
b14ec34b1e07
6989448: G1: refactor and simplify G1ParScanThreadState
jcoomes
parents:
1861
diff
changeset
|
4343 } else { |
|
b14ec34b1e07
6989448: G1: refactor and simplify G1ParScanThreadState
jcoomes
parents:
1861
diff
changeset
|
4344 return verify_ref((oop*) ref); |
|
b14ec34b1e07
6989448: G1: refactor and simplify G1ParScanThreadState
jcoomes
parents:
1861
diff
changeset
|
4345 } |
|
b14ec34b1e07
6989448: G1: refactor and simplify G1ParScanThreadState
jcoomes
parents:
1861
diff
changeset
|
4346 } |
|
b14ec34b1e07
6989448: G1: refactor and simplify G1ParScanThreadState
jcoomes
parents:
1861
diff
changeset
|
4347 #endif // ASSERT |
|
b14ec34b1e07
6989448: G1: refactor and simplify G1ParScanThreadState
jcoomes
parents:
1861
diff
changeset
|
4348 |
|
b14ec34b1e07
6989448: G1: refactor and simplify G1ParScanThreadState
jcoomes
parents:
1861
diff
changeset
|
4349 void G1ParScanThreadState::trim_queue() { |
|
3979
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
4350 assert(_evac_cl != NULL, "not set"); |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
4351 assert(_evac_failure_cl != NULL, "not set"); |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
4352 assert(_partial_scan_cl != NULL, "not set"); |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
4353 |
|
1862
b14ec34b1e07
6989448: G1: refactor and simplify G1ParScanThreadState
jcoomes
parents:
1861
diff
changeset
|
4354 StarTask ref; |
|
b14ec34b1e07
6989448: G1: refactor and simplify G1ParScanThreadState
jcoomes
parents:
1861
diff
changeset
|
4355 do { |
|
b14ec34b1e07
6989448: G1: refactor and simplify G1ParScanThreadState
jcoomes
parents:
1861
diff
changeset
|
4356 // Drain the overflow stack first, so other threads can steal. |
|
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|
4357 while (refs()->pop_overflow(ref)) { |
|
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|
4358 deal_with_reference(ref); |
|
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|
4359 } |
|
3979
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|
4360 |
|
1862
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|
4361 while (refs()->pop_local(ref)) { |
|
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|
4362 deal_with_reference(ref); |
|
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|
4363 } |
|
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|
4364 } while (!refs()->is_empty()); |
|
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|
4365 } |
|
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|
4366 |
|
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|
4367 G1ParClosureSuper::G1ParClosureSuper(G1CollectedHeap* g1, |
|
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|
4368 G1ParScanThreadState* par_scan_state) : |
| 342 | 4369 _g1(g1), _g1_rem(_g1->g1_rem_set()), _cm(_g1->concurrent_mark()), |
|
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|
4370 _par_scan_state(par_scan_state), |
|
4836
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|
4371 _worker_id(par_scan_state->queue_num()), |
|
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|
4372 _during_initial_mark(_g1->g1_policy()->during_initial_mark_pause()), |
|
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4373 _mark_in_progress(_g1->mark_in_progress()) { } |
|
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|
4374 |
| 5987 | 4375 template <bool do_gen_barrier, G1Barrier barrier, bool do_mark_object> |
| 4376 void G1ParCopyClosure<do_gen_barrier, barrier, do_mark_object>::mark_object(oop obj) { | |
|
4787
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|
4377 #ifdef ASSERT |
|
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4378 HeapRegion* hr = _g1->heap_region_containing(obj); |
|
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|
4379 assert(hr != NULL, "sanity"); |
|
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|
4380 assert(!hr->in_collection_set(), "should not mark objects in the CSet"); |
|
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|
4381 #endif // ASSERT |
|
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|
4382 |
|
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|
4383 // We know that the object is not moving so it's safe to read its size. |
|
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|
4384 _cm->grayRoot(obj, (size_t) obj->size(), _worker_id); |
|
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|
4385 } |
|
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|
4386 |
| 5987 | 4387 template <bool do_gen_barrier, G1Barrier barrier, bool do_mark_object> |
| 4388 void G1ParCopyClosure<do_gen_barrier, barrier, do_mark_object> | |
| 4389 ::mark_forwarded_object(oop from_obj, oop to_obj) { | |
|
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|
4390 #ifdef ASSERT |
|
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|
4391 assert(from_obj->is_forwarded(), "from obj should be forwarded"); |
|
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|
4392 assert(from_obj->forwardee() == to_obj, "to obj should be the forwardee"); |
|
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|
4393 assert(from_obj != to_obj, "should not be self-forwarded"); |
|
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|
4394 |
|
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|
4395 HeapRegion* from_hr = _g1->heap_region_containing(from_obj); |
|
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|
4396 assert(from_hr != NULL, "sanity"); |
|
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|
4397 assert(from_hr->in_collection_set(), "from obj should be in the CSet"); |
|
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|
4398 |
|
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|
4399 HeapRegion* to_hr = _g1->heap_region_containing(to_obj); |
|
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|
4400 assert(to_hr != NULL, "sanity"); |
|
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|
4401 assert(!to_hr->in_collection_set(), "should not mark objects in the CSet"); |
|
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|
4402 #endif // ASSERT |
|
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|
4403 |
|
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|
4404 // The object might be in the process of being copied by another |
|
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|
4405 // worker so we cannot trust that its to-space image is |
|
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|
4406 // well-formed. So we have to read its size from its from-space |
|
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|
4407 // image which we know should not be changing. |
|
4836
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|
4408 _cm->grayRoot(to_obj, (size_t) from_obj->size(), _worker_id); |
|
4787
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|
4409 } |
|
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|
4410 |
| 5987 | 4411 template <bool do_gen_barrier, G1Barrier barrier, bool do_mark_object> |
| 4412 oop G1ParCopyClosure<do_gen_barrier, barrier, do_mark_object> | |
| 4413 ::copy_to_survivor_space(oop old) { | |
|
6010
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|
4414 size_t word_sz = old->size(); |
| 342 | 4415 HeapRegion* from_region = _g1->heap_region_containing_raw(old); |
| 4416 // +1 to make the -1 indexes valid... | |
| 4417 int young_index = from_region->young_index_in_cset()+1; | |
|
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|
4418 assert( (from_region->is_young() && young_index > 0) || |
|
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|
4419 (!from_region->is_young() && young_index == 0), "invariant" ); |
| 342 | 4420 G1CollectorPolicy* g1p = _g1->g1_policy(); |
| 4421 markOop m = old->mark(); | |
| 545 | 4422 int age = m->has_displaced_mark_helper() ? m->displaced_mark_helper()->age() |
| 4423 : m->age(); | |
| 4424 GCAllocPurpose alloc_purpose = g1p->evacuation_destination(from_region, age, | |
| 342 | 4425 word_sz); |
| 4426 HeapWord* obj_ptr = _par_scan_state->allocate(alloc_purpose, word_sz); | |
| 4427 oop obj = oop(obj_ptr); | |
| 4428 | |
| 4429 if (obj_ptr == NULL) { | |
| 4430 // This will either forward-to-self, or detect that someone else has | |
| 4431 // installed a forwarding pointer. | |
| 4432 OopsInHeapRegionClosure* cl = _par_scan_state->evac_failure_closure(); | |
|
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|
4433 return _g1->handle_evacuation_failure_par(cl, old); |
| 342 | 4434 } |
| 4435 | |
| 526 | 4436 // We're going to allocate linearly, so might as well prefetch ahead. |
| 4437 Prefetch::write(obj_ptr, PrefetchCopyIntervalInBytes); | |
| 4438 | |
| 342 | 4439 oop forward_ptr = old->forward_to_atomic(obj); |
| 4440 if (forward_ptr == NULL) { | |
| 4441 Copy::aligned_disjoint_words((HeapWord*) old, obj_ptr, word_sz); | |
| 526 | 4442 if (g1p->track_object_age(alloc_purpose)) { |
| 4443 // We could simply do obj->incr_age(). However, this causes a | |
| 4444 // performance issue. obj->incr_age() will first check whether | |
| 4445 // the object has a displaced mark by checking its mark word; | |
| 4446 // getting the mark word from the new location of the object | |
| 4447 // stalls. So, given that we already have the mark word and we | |
| 4448 // are about to install it anyway, it's better to increase the | |
| 4449 // age on the mark word, when the object does not have a | |
| 4450 // displaced mark word. We're not expecting many objects to have | |
| 4451 // a displaced marked word, so that case is not optimized | |
| 4452 // further (it could be...) and we simply call obj->incr_age(). | |
| 4453 | |
| 4454 if (m->has_displaced_mark_helper()) { | |
| 4455 // in this case, we have to install the mark word first, | |
| 4456 // otherwise obj looks to be forwarded (the old mark word, | |
| 4457 // which contains the forward pointer, was copied) | |
| 4458 obj->set_mark(m); | |
| 4459 obj->incr_age(); | |
| 4460 } else { | |
| 4461 m = m->incr_age(); | |
| 545 | 4462 obj->set_mark(m); |
| 526 | 4463 } |
| 545 | 4464 _par_scan_state->age_table()->add(obj, word_sz); |
| 4465 } else { | |
| 4466 obj->set_mark(m); | |
| 526 | 4467 } |
| 4468 | |
| 342 | 4469 size_t* surv_young_words = _par_scan_state->surviving_young_words(); |
| 4470 surv_young_words[young_index] += word_sz; | |
| 4471 | |
| 4472 if (obj->is_objArray() && arrayOop(obj)->length() >= ParGCArrayScanChunk) { | |
|
4784
02838862dec8
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changeset
|
4473 // We keep track of the next start index in the length field of |
|
02838862dec8
7121623: G1: always be able to reliably calculate the length of a forwarded chunked array
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changeset
|
4474 // the to-space object. The actual length can be found in the |
|
02838862dec8
7121623: G1: always be able to reliably calculate the length of a forwarded chunked array
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|
4475 // length field of the from-space object. |
|
02838862dec8
7121623: G1: always be able to reliably calculate the length of a forwarded chunked array
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diff
changeset
|
4476 arrayOop(obj)->set_length(0); |
|
845
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6700789: G1: Enable use of compressed oops with G1 heaps
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|
4477 oop* old_p = set_partial_array_mask(old); |
|
df6caf649ff7
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|
4478 _par_scan_state->push_on_queue(old_p); |
| 342 | 4479 } else { |
| 526 | 4480 // No point in using the slower heap_region_containing() method, |
| 4481 // given that we know obj is in the heap. | |
| 5987 | 4482 _scanner.set_region(_g1->heap_region_containing_raw(obj)); |
| 4483 obj->oop_iterate_backwards(&_scanner); | |
| 342 | 4484 } |
| 4485 } else { | |
| 4486 _par_scan_state->undo_allocation(alloc_purpose, obj_ptr, word_sz); | |
| 4487 obj = forward_ptr; | |
| 4488 } | |
| 4489 return obj; | |
| 4490 } | |
| 4491 | |
|
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|
4492 template <bool do_gen_barrier, G1Barrier barrier, bool do_mark_object> |
|
845
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|
4493 template <class T> |
|
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|
4494 void G1ParCopyClosure<do_gen_barrier, barrier, do_mark_object> |
|
845
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|
4495 ::do_oop_work(T* p) { |
|
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6700789: G1: Enable use of compressed oops with G1 heaps
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|
4496 oop obj = oopDesc::load_decode_heap_oop(p); |
| 342 | 4497 assert(barrier != G1BarrierRS || obj != NULL, |
|
4787
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|
4498 "Precondition: G1BarrierRS implies obj is non-NULL"); |
|
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|
4499 |
|
4836
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|
4500 assert(_worker_id == _par_scan_state->queue_num(), "sanity"); |
|
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|
4501 |
| 526 | 4502 // here the null check is implicit in the cset_fast_test() test |
|
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|
4503 if (_g1->in_cset_fast_test(obj)) { |
|
4787
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|
4504 oop forwardee; |
| 526 | 4505 if (obj->is_forwarded()) { |
|
4787
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|
4506 forwardee = obj->forwardee(); |
| 526 | 4507 } else { |
|
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|
4508 forwardee = copy_to_survivor_space(obj); |
| 342 | 4509 } |
|
4787
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|
4510 assert(forwardee != NULL, "forwardee should not be NULL"); |
|
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|
4511 oopDesc::encode_store_heap_oop(p, forwardee); |
|
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|
4512 if (do_mark_object && forwardee != obj) { |
|
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|
4513 // If the object is self-forwarded we don't need to explicitly |
|
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|
4514 // mark it, the evacuation failure protocol will do so. |
|
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changeset
|
4515 mark_forwarded_object(obj, forwardee); |
|
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
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|
4516 } |
|
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|
4517 |
| 526 | 4518 // When scanning the RS, we only care about objs in CS. |
| 4519 if (barrier == G1BarrierRS) { | |
|
4836
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|
4520 _par_scan_state->update_rs(_from, p, _worker_id); |
| 342 | 4521 } |
|
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|
4522 } else { |
|
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changeset
|
4523 // The object is not in collection set. If we're a root scanning |
|
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diff
changeset
|
4524 // closure during an initial mark pause (i.e. do_mark_object will |
|
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diff
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|
4525 // be true) then attempt to mark the object. |
|
4787
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diff
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|
4526 if (do_mark_object && _g1->is_in_g1_reserved(obj)) { |
|
2ace1c4ee8da
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changeset
|
4527 mark_object(obj); |
|
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|
4528 } |
| 526 | 4529 } |
| 4530 | |
| 4531 if (barrier == G1BarrierEvac && obj != NULL) { | |
|
4836
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|
4532 _par_scan_state->update_rs(_from, p, _worker_id); |
| 526 | 4533 } |
| 4534 | |
| 4535 if (do_gen_barrier && obj != NULL) { | |
| 4536 par_do_barrier(p); | |
| 4537 } | |
| 4538 } | |
| 4539 | |
|
1261
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changeset
|
4540 template void G1ParCopyClosure<false, G1BarrierEvac, false>::do_oop_work(oop* p); |
|
0414c1049f15
6923991: G1: improve scalability of RSet scanning
iveresov
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1245
diff
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|
4541 template void G1ParCopyClosure<false, G1BarrierEvac, false>::do_oop_work(narrowOop* p); |
|
845
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
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|
4542 |
|
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|
4543 template <class T> void G1ParScanPartialArrayClosure::do_oop_nv(T* p) { |
| 526 | 4544 assert(has_partial_array_mask(p), "invariant"); |
|
4784
02838862dec8
7121623: G1: always be able to reliably calculate the length of a forwarded chunked array
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diff
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|
4545 oop from_obj = clear_partial_array_mask(p); |
|
02838862dec8
7121623: G1: always be able to reliably calculate the length of a forwarded chunked array
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diff
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|
4546 |
|
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7121623: G1: always be able to reliably calculate the length of a forwarded chunked array
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diff
changeset
|
4547 assert(Universe::heap()->is_in_reserved(from_obj), "must be in heap."); |
|
02838862dec8
7121623: G1: always be able to reliably calculate the length of a forwarded chunked array
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4783
diff
changeset
|
4548 assert(from_obj->is_objArray(), "must be obj array"); |
|
02838862dec8
7121623: G1: always be able to reliably calculate the length of a forwarded chunked array
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diff
changeset
|
4549 objArrayOop from_obj_array = objArrayOop(from_obj); |
|
02838862dec8
7121623: G1: always be able to reliably calculate the length of a forwarded chunked array
tonyp
parents:
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diff
changeset
|
4550 // The from-space object contains the real length. |
|
02838862dec8
7121623: G1: always be able to reliably calculate the length of a forwarded chunked array
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diff
changeset
|
4551 int length = from_obj_array->length(); |
|
02838862dec8
7121623: G1: always be able to reliably calculate the length of a forwarded chunked array
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|
4552 |
|
02838862dec8
7121623: G1: always be able to reliably calculate the length of a forwarded chunked array
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diff
changeset
|
4553 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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diff
changeset
|
4554 oop to_obj = from_obj->forwardee(); |
|
02838862dec8
7121623: G1: always be able to reliably calculate the length of a forwarded chunked array
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diff
changeset
|
4555 assert(from_obj != to_obj, "should not be chunking self-forwarded objects"); |
|
02838862dec8
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diff
changeset
|
4556 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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diff
changeset
|
4557 // We keep track of the next start index in the length field of the |
|
02838862dec8
7121623: G1: always be able to reliably calculate the length of a forwarded chunked array
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diff
changeset
|
4558 // to-space object. |
|
02838862dec8
7121623: G1: always be able to reliably calculate the length of a forwarded chunked array
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diff
changeset
|
4559 int next_index = to_obj_array->length(); |
|
02838862dec8
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diff
changeset
|
4560 assert(0 <= next_index && next_index < length, |
|
02838862dec8
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diff
changeset
|
4561 err_msg("invariant, next index: %d, length: %d", next_index, length)); |
|
02838862dec8
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changeset
|
4562 |
|
02838862dec8
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changeset
|
4563 int start = next_index; |
|
02838862dec8
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diff
changeset
|
4564 int end = length; |
|
02838862dec8
7121623: G1: always be able to reliably calculate the length of a forwarded chunked array
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diff
changeset
|
4565 int remainder = end - start; |
|
02838862dec8
7121623: G1: always be able to reliably calculate the length of a forwarded chunked array
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diff
changeset
|
4566 // We'll try not to push a range that's smaller than ParGCArrayScanChunk. |
| 342 | 4567 if (remainder > 2 * ParGCArrayScanChunk) { |
| 4568 end = start + ParGCArrayScanChunk; | |
|
4784
02838862dec8
7121623: G1: always be able to reliably calculate the length of a forwarded chunked array
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changeset
|
4569 to_obj_array->set_length(end); |
|
02838862dec8
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changeset
|
4570 // Push the remainder before we process the range in case another |
|
02838862dec8
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|
4571 // worker has run out of things to do and can steal it. |
|
02838862dec8
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changeset
|
4572 oop* from_obj_p = set_partial_array_mask(from_obj); |
|
02838862dec8
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changeset
|
4573 _par_scan_state->push_on_queue(from_obj_p); |
| 342 | 4574 } else { |
|
4784
02838862dec8
7121623: G1: always be able to reliably calculate the length of a forwarded chunked array
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changeset
|
4575 assert(length == end, "sanity"); |
|
02838862dec8
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diff
changeset
|
4576 // We'll process the final range for this object. Restore the length |
|
02838862dec8
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diff
changeset
|
4577 // 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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diff
changeset
|
4578 to_obj_array->set_length(end); |
|
02838862dec8
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4783
diff
changeset
|
4579 } |
|
02838862dec8
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diff
changeset
|
4580 _scanner.set_region(_g1->heap_region_containing_raw(to_obj)); |
|
02838862dec8
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parents:
4783
diff
changeset
|
4581 // Process indexes [start,end). It will also process the header |
|
02838862dec8
7121623: G1: always be able to reliably calculate the length of a forwarded chunked array
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parents:
4783
diff
changeset
|
4582 // 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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parents:
4783
diff
changeset
|
4583 // 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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4783
diff
changeset
|
4584 // 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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parents:
4783
diff
changeset
|
4585 // start index. oop_iterate_range() (thankfully!) ignores the length |
|
02838862dec8
7121623: G1: always be able to reliably calculate the length of a forwarded chunked array
tonyp
parents:
4783
diff
changeset
|
4586 // 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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4783
diff
changeset
|
4587 // however return the size of the object which will be incorrect. So |
|
02838862dec8
7121623: G1: always be able to reliably calculate the length of a forwarded chunked array
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parents:
4783
diff
changeset
|
4588 // we have to ignore it even if we wanted to use it. |
|
02838862dec8
7121623: G1: always be able to reliably calculate the length of a forwarded chunked array
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parents:
4783
diff
changeset
|
4589 to_obj_array->oop_iterate_range(&_scanner, start, end); |
| 342 | 4590 } |
| 4591 | |
| 4592 class G1ParEvacuateFollowersClosure : public VoidClosure { | |
| 4593 protected: | |
| 4594 G1CollectedHeap* _g1h; | |
| 4595 G1ParScanThreadState* _par_scan_state; | |
| 4596 RefToScanQueueSet* _queues; | |
| 4597 ParallelTaskTerminator* _terminator; | |
| 4598 | |
| 4599 G1ParScanThreadState* par_scan_state() { return _par_scan_state; } | |
| 4600 RefToScanQueueSet* queues() { return _queues; } | |
| 4601 ParallelTaskTerminator* terminator() { return _terminator; } | |
| 4602 | |
| 4603 public: | |
| 4604 G1ParEvacuateFollowersClosure(G1CollectedHeap* g1h, | |
| 4605 G1ParScanThreadState* par_scan_state, | |
| 4606 RefToScanQueueSet* queues, | |
| 4607 ParallelTaskTerminator* terminator) | |
| 4608 : _g1h(g1h), _par_scan_state(par_scan_state), | |
| 4609 _queues(queues), _terminator(terminator) {} | |
| 4610 | |
|
1862
b14ec34b1e07
6989448: G1: refactor and simplify G1ParScanThreadState
jcoomes
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1861
diff
changeset
|
4611 void do_void(); |
|
b14ec34b1e07
6989448: G1: refactor and simplify G1ParScanThreadState
jcoomes
parents:
1861
diff
changeset
|
4612 |
|
b14ec34b1e07
6989448: G1: refactor and simplify G1ParScanThreadState
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diff
changeset
|
4613 private: |
|
b14ec34b1e07
6989448: G1: refactor and simplify G1ParScanThreadState
jcoomes
parents:
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diff
changeset
|
4614 inline bool offer_termination(); |
|
b14ec34b1e07
6989448: G1: refactor and simplify G1ParScanThreadState
jcoomes
parents:
1861
diff
changeset
|
4615 }; |
|
b14ec34b1e07
6989448: G1: refactor and simplify G1ParScanThreadState
jcoomes
parents:
1861
diff
changeset
|
4616 |
|
b14ec34b1e07
6989448: G1: refactor and simplify G1ParScanThreadState
jcoomes
parents:
1861
diff
changeset
|
4617 bool G1ParEvacuateFollowersClosure::offer_termination() { |
|
b14ec34b1e07
6989448: G1: refactor and simplify G1ParScanThreadState
jcoomes
parents:
1861
diff
changeset
|
4618 G1ParScanThreadState* const pss = par_scan_state(); |
|
b14ec34b1e07
6989448: G1: refactor and simplify G1ParScanThreadState
jcoomes
parents:
1861
diff
changeset
|
4619 pss->start_term_time(); |
|
b14ec34b1e07
6989448: G1: refactor and simplify G1ParScanThreadState
jcoomes
parents:
1861
diff
changeset
|
4620 const bool res = terminator()->offer_termination(); |
|
b14ec34b1e07
6989448: G1: refactor and simplify G1ParScanThreadState
jcoomes
parents:
1861
diff
changeset
|
4621 pss->end_term_time(); |
|
b14ec34b1e07
6989448: G1: refactor and simplify G1ParScanThreadState
jcoomes
parents:
1861
diff
changeset
|
4622 return res; |
|
b14ec34b1e07
6989448: G1: refactor and simplify G1ParScanThreadState
jcoomes
parents:
1861
diff
changeset
|
4623 } |
|
b14ec34b1e07
6989448: G1: refactor and simplify G1ParScanThreadState
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parents:
1861
diff
changeset
|
4624 |
|
b14ec34b1e07
6989448: G1: refactor and simplify G1ParScanThreadState
jcoomes
parents:
1861
diff
changeset
|
4625 void G1ParEvacuateFollowersClosure::do_void() { |
|
b14ec34b1e07
6989448: G1: refactor and simplify G1ParScanThreadState
jcoomes
parents:
1861
diff
changeset
|
4626 StarTask stolen_task; |
|
b14ec34b1e07
6989448: G1: refactor and simplify G1ParScanThreadState
jcoomes
parents:
1861
diff
changeset
|
4627 G1ParScanThreadState* const pss = par_scan_state(); |
|
b14ec34b1e07
6989448: G1: refactor and simplify G1ParScanThreadState
jcoomes
parents:
1861
diff
changeset
|
4628 pss->trim_queue(); |
|
b14ec34b1e07
6989448: G1: refactor and simplify G1ParScanThreadState
jcoomes
parents:
1861
diff
changeset
|
4629 |
|
b14ec34b1e07
6989448: G1: refactor and simplify G1ParScanThreadState
jcoomes
parents:
1861
diff
changeset
|
4630 do { |
|
b14ec34b1e07
6989448: G1: refactor and simplify G1ParScanThreadState
jcoomes
parents:
1861
diff
changeset
|
4631 while (queues()->steal(pss->queue_num(), pss->hash_seed(), stolen_task)) { |
|
b14ec34b1e07
6989448: G1: refactor and simplify G1ParScanThreadState
jcoomes
parents:
1861
diff
changeset
|
4632 assert(pss->verify_task(stolen_task), "sanity"); |
|
b14ec34b1e07
6989448: G1: refactor and simplify G1ParScanThreadState
jcoomes
parents:
1861
diff
changeset
|
4633 if (stolen_task.is_narrow()) { |
|
1883
35e4e086d5f5
6990359: G1: don't push a stolen entry on the taskqueue, deal with it directly
tonyp
parents:
1862
diff
changeset
|
4634 pss->deal_with_reference((narrowOop*) stolen_task); |
|
1862
b14ec34b1e07
6989448: G1: refactor and simplify G1ParScanThreadState
jcoomes
parents:
1861
diff
changeset
|
4635 } else { |
|
1883
35e4e086d5f5
6990359: G1: don't push a stolen entry on the taskqueue, deal with it directly
tonyp
parents:
1862
diff
changeset
|
4636 pss->deal_with_reference((oop*) stolen_task); |
|
1862
b14ec34b1e07
6989448: G1: refactor and simplify G1ParScanThreadState
jcoomes
parents:
1861
diff
changeset
|
4637 } |
|
1883
35e4e086d5f5
6990359: G1: don't push a stolen entry on the taskqueue, deal with it directly
tonyp
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1862
diff
changeset
|
4638 |
|
35e4e086d5f5
6990359: G1: don't push a stolen entry on the taskqueue, deal with it directly
tonyp
parents:
1862
diff
changeset
|
4639 // We've just processed a reference and we might have made |
|
35e4e086d5f5
6990359: G1: don't push a stolen entry on the taskqueue, deal with it directly
tonyp
parents:
1862
diff
changeset
|
4640 // available new entries on the queues. So we have to make sure |
|
35e4e086d5f5
6990359: G1: don't push a stolen entry on the taskqueue, deal with it directly
tonyp
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1862
diff
changeset
|
4641 // we drain the queues as necessary. |
| 342 | 4642 pss->trim_queue(); |
| 4643 } | |
|
1862
b14ec34b1e07
6989448: G1: refactor and simplify G1ParScanThreadState
jcoomes
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1861
diff
changeset
|
4644 } while (!offer_termination()); |
|
b14ec34b1e07
6989448: G1: refactor and simplify G1ParScanThreadState
jcoomes
parents:
1861
diff
changeset
|
4645 |
|
b14ec34b1e07
6989448: G1: refactor and simplify G1ParScanThreadState
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1861
diff
changeset
|
4646 pss->retire_alloc_buffers(); |
|
b14ec34b1e07
6989448: G1: refactor and simplify G1ParScanThreadState
jcoomes
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1861
diff
changeset
|
4647 } |
| 342 | 4648 |
| 4649 class G1ParTask : public AbstractGangTask { | |
| 4650 protected: | |
| 4651 G1CollectedHeap* _g1h; | |
| 4652 RefToScanQueueSet *_queues; | |
| 4653 ParallelTaskTerminator _terminator; | |
|
4728
441e946dc1af
7121618: Change type of number of GC workers to unsigned int.
jmasa
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4711
diff
changeset
|
4654 uint _n_workers; |
| 342 | 4655 |
| 4656 Mutex _stats_lock; | |
| 4657 Mutex* stats_lock() { return &_stats_lock; } | |
| 4658 | |
| 4659 size_t getNCards() { | |
| 4660 return (_g1h->capacity() + G1BlockOffsetSharedArray::N_bytes - 1) | |
| 4661 / G1BlockOffsetSharedArray::N_bytes; | |
| 4662 } | |
| 4663 | |
| 4664 public: | |
|
4095
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6593758: RFE: Enhance GC ergonomics to dynamically choose ParallelGCThreads
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4090
diff
changeset
|
4665 G1ParTask(G1CollectedHeap* g1h, |
|
bca17e38de00
6593758: RFE: Enhance GC ergonomics to dynamically choose ParallelGCThreads
jmasa
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4090
diff
changeset
|
4666 RefToScanQueueSet *task_queues) |
| 342 | 4667 : AbstractGangTask("G1 collection"), |
| 4668 _g1h(g1h), | |
| 4669 _queues(task_queues), | |
|
4095
bca17e38de00
6593758: RFE: Enhance GC ergonomics to dynamically choose ParallelGCThreads
jmasa
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4090
diff
changeset
|
4670 _terminator(0, _queues), |
|
bca17e38de00
6593758: RFE: Enhance GC ergonomics to dynamically choose ParallelGCThreads
jmasa
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4090
diff
changeset
|
4671 _stats_lock(Mutex::leaf, "parallel G1 stats lock", true) |
| 342 | 4672 {} |
| 4673 | |
| 4674 RefToScanQueueSet* queues() { return _queues; } | |
| 4675 | |
| 4676 RefToScanQueue *work_queue(int i) { | |
| 4677 return queues()->queue(i); | |
| 4678 } | |
| 4679 | |
|
4095
bca17e38de00
6593758: RFE: Enhance GC ergonomics to dynamically choose ParallelGCThreads
jmasa
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4090
diff
changeset
|
4680 ParallelTaskTerminator* terminator() { return &_terminator; } |
|
bca17e38de00
6593758: RFE: Enhance GC ergonomics to dynamically choose ParallelGCThreads
jmasa
parents:
4090
diff
changeset
|
4681 |
|
bca17e38de00
6593758: RFE: Enhance GC ergonomics to dynamically choose ParallelGCThreads
jmasa
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4090
diff
changeset
|
4682 virtual void set_for_termination(int active_workers) { |
|
bca17e38de00
6593758: RFE: Enhance GC ergonomics to dynamically choose ParallelGCThreads
jmasa
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4090
diff
changeset
|
4683 // This task calls set_n_termination() in par_non_clean_card_iterate_work() |
|
bca17e38de00
6593758: RFE: Enhance GC ergonomics to dynamically choose ParallelGCThreads
jmasa
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4090
diff
changeset
|
4684 // in the young space (_par_seq_tasks) in the G1 heap |
|
bca17e38de00
6593758: RFE: Enhance GC ergonomics to dynamically choose ParallelGCThreads
jmasa
parents:
4090
diff
changeset
|
4685 // for SequentialSubTasksDone. |
|
bca17e38de00
6593758: RFE: Enhance GC ergonomics to dynamically choose ParallelGCThreads
jmasa
parents:
4090
diff
changeset
|
4686 // This task also uses SubTasksDone in SharedHeap and G1CollectedHeap |
|
bca17e38de00
6593758: RFE: Enhance GC ergonomics to dynamically choose ParallelGCThreads
jmasa
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4090
diff
changeset
|
4687 // both of which need setting by set_n_termination(). |
|
bca17e38de00
6593758: RFE: Enhance GC ergonomics to dynamically choose ParallelGCThreads
jmasa
parents:
4090
diff
changeset
|
4688 _g1h->SharedHeap::set_n_termination(active_workers); |
|
bca17e38de00
6593758: RFE: Enhance GC ergonomics to dynamically choose ParallelGCThreads
jmasa
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4090
diff
changeset
|
4689 _g1h->set_n_termination(active_workers); |
|
bca17e38de00
6593758: RFE: Enhance GC ergonomics to dynamically choose ParallelGCThreads
jmasa
parents:
4090
diff
changeset
|
4690 terminator()->reset_for_reuse(active_workers); |
|
bca17e38de00
6593758: RFE: Enhance GC ergonomics to dynamically choose ParallelGCThreads
jmasa
parents:
4090
diff
changeset
|
4691 _n_workers = active_workers; |
|
bca17e38de00
6593758: RFE: Enhance GC ergonomics to dynamically choose ParallelGCThreads
jmasa
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4090
diff
changeset
|
4692 } |
|
bca17e38de00
6593758: RFE: Enhance GC ergonomics to dynamically choose ParallelGCThreads
jmasa
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4090
diff
changeset
|
4693 |
|
4728
441e946dc1af
7121618: Change type of number of GC workers to unsigned int.
jmasa
parents:
4711
diff
changeset
|
4694 void work(uint worker_id) { |
|
441e946dc1af
7121618: Change type of number of GC workers to unsigned int.
jmasa
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4711
diff
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|
4695 if (worker_id >= _n_workers) return; // no work needed this round |
| 1611 | 4696 |
| 4697 double start_time_ms = os::elapsedTime() * 1000.0; | |
|
4728
441e946dc1af
7121618: Change type of number of GC workers to unsigned int.
jmasa
parents:
4711
diff
changeset
|
4698 _g1h->g1_policy()->record_gc_worker_start_time(worker_id, start_time_ms); |
| 1611 | 4699 |
|
5986
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5963
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|
4700 { |
|
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5963
diff
changeset
|
4701 ResourceMark rm; |
|
500023bd0818
7143511: G1: Another instance of high GC Worker Other time (50ms)
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5963
diff
changeset
|
4702 HandleMark hm; |
|
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7143511: G1: Another instance of high GC Worker Other time (50ms)
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5963
diff
changeset
|
4703 |
|
500023bd0818
7143511: G1: Another instance of high GC Worker Other time (50ms)
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changeset
|
4704 ReferenceProcessor* rp = _g1h->ref_processor_stw(); |
|
500023bd0818
7143511: G1: Another instance of high GC Worker Other time (50ms)
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|
4705 |
|
500023bd0818
7143511: G1: Another instance of high GC Worker Other time (50ms)
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|
4706 G1ParScanThreadState pss(_g1h, worker_id); |
|
500023bd0818
7143511: G1: Another instance of high GC Worker Other time (50ms)
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|
4707 G1ParScanHeapEvacClosure scan_evac_cl(_g1h, &pss, rp); |
|
500023bd0818
7143511: G1: Another instance of high GC Worker Other time (50ms)
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|
4708 G1ParScanHeapEvacFailureClosure evac_failure_cl(_g1h, &pss, rp); |
|
500023bd0818
7143511: G1: Another instance of high GC Worker Other time (50ms)
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changeset
|
4709 G1ParScanPartialArrayClosure partial_scan_cl(_g1h, &pss, rp); |
|
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7143511: G1: Another instance of high GC Worker Other time (50ms)
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|
4710 |
|
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changeset
|
4711 pss.set_evac_closure(&scan_evac_cl); |
|
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|
4712 pss.set_evac_failure_closure(&evac_failure_cl); |
|
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|
4713 pss.set_partial_scan_closure(&partial_scan_cl); |
|
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|
4714 |
|
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changeset
|
4715 G1ParScanExtRootClosure only_scan_root_cl(_g1h, &pss, rp); |
|
500023bd0818
7143511: G1: Another instance of high GC Worker Other time (50ms)
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|
4716 G1ParScanPermClosure only_scan_perm_cl(_g1h, &pss, rp); |
|
500023bd0818
7143511: G1: Another instance of high GC Worker Other time (50ms)
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|
4717 |
|
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|
4718 G1ParScanAndMarkExtRootClosure scan_mark_root_cl(_g1h, &pss, rp); |
|
500023bd0818
7143511: G1: Another instance of high GC Worker Other time (50ms)
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|
4719 G1ParScanAndMarkPermClosure scan_mark_perm_cl(_g1h, &pss, rp); |
|
500023bd0818
7143511: G1: Another instance of high GC Worker Other time (50ms)
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|
4720 |
|
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changeset
|
4721 OopClosure* scan_root_cl = &only_scan_root_cl; |
|
500023bd0818
7143511: G1: Another instance of high GC Worker Other time (50ms)
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|
4722 OopsInHeapRegionClosure* scan_perm_cl = &only_scan_perm_cl; |
|
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|
4723 |
|
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|
4724 if (_g1h->g1_policy()->during_initial_mark_pause()) { |
|
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|
4725 // We also need to mark copied objects. |
|
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|
4726 scan_root_cl = &scan_mark_root_cl; |
|
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changeset
|
4727 scan_perm_cl = &scan_mark_perm_cl; |
|
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changeset
|
4728 } |
|
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diff
changeset
|
4729 |
|
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diff
changeset
|
4730 G1ParPushHeapRSClosure push_heap_rs_cl(_g1h, &pss); |
|
500023bd0818
7143511: G1: Another instance of high GC Worker Other time (50ms)
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|
4731 |
|
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diff
changeset
|
4732 pss.start_strong_roots(); |
|
500023bd0818
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diff
changeset
|
4733 _g1h->g1_process_strong_roots(/* not collecting perm */ false, |
|
500023bd0818
7143511: G1: Another instance of high GC Worker Other time (50ms)
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changeset
|
4734 SharedHeap::SO_AllClasses, |
|
500023bd0818
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5963
diff
changeset
|
4735 scan_root_cl, |
|
500023bd0818
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changeset
|
4736 &push_heap_rs_cl, |
|
500023bd0818
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diff
changeset
|
4737 scan_perm_cl, |
|
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7143511: G1: Another instance of high GC Worker Other time (50ms)
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5963
diff
changeset
|
4738 worker_id); |
|
500023bd0818
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diff
changeset
|
4739 pss.end_strong_roots(); |
|
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diff
changeset
|
4740 |
|
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diff
changeset
|
4741 { |
|
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parents:
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diff
changeset
|
4742 double start = os::elapsedTime(); |
|
500023bd0818
7143511: G1: Another instance of high GC Worker Other time (50ms)
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parents:
5963
diff
changeset
|
4743 G1ParEvacuateFollowersClosure evac(_g1h, &pss, _queues, &_terminator); |
|
500023bd0818
7143511: G1: Another instance of high GC Worker Other time (50ms)
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diff
changeset
|
4744 evac.do_void(); |
|
500023bd0818
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parents:
5963
diff
changeset
|
4745 double elapsed_ms = (os::elapsedTime()-start)*1000.0; |
|
500023bd0818
7143511: G1: Another instance of high GC Worker Other time (50ms)
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diff
changeset
|
4746 double term_ms = pss.term_time()*1000.0; |
|
500023bd0818
7143511: G1: Another instance of high GC Worker Other time (50ms)
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parents:
5963
diff
changeset
|
4747 _g1h->g1_policy()->record_obj_copy_time(worker_id, elapsed_ms-term_ms); |
|
500023bd0818
7143511: G1: Another instance of high GC Worker Other time (50ms)
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parents:
5963
diff
changeset
|
4748 _g1h->g1_policy()->record_termination(worker_id, term_ms, pss.term_attempts()); |
|
500023bd0818
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diff
changeset
|
4749 } |
|
500023bd0818
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parents:
5963
diff
changeset
|
4750 _g1h->g1_policy()->record_thread_age_table(pss.age_table()); |
|
500023bd0818
7143511: G1: Another instance of high GC Worker Other time (50ms)
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parents:
5963
diff
changeset
|
4751 _g1h->update_surviving_young_words(pss.surviving_young_words()+1); |
|
500023bd0818
7143511: G1: Another instance of high GC Worker Other time (50ms)
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parents:
5963
diff
changeset
|
4752 |
|
500023bd0818
7143511: G1: Another instance of high GC Worker Other time (50ms)
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parents:
5963
diff
changeset
|
4753 if (ParallelGCVerbose) { |
|
500023bd0818
7143511: G1: Another instance of high GC Worker Other time (50ms)
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parents:
5963
diff
changeset
|
4754 MutexLocker x(stats_lock()); |
|
500023bd0818
7143511: G1: Another instance of high GC Worker Other time (50ms)
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parents:
5963
diff
changeset
|
4755 pss.print_termination_stats(worker_id); |
|
500023bd0818
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parents:
5963
diff
changeset
|
4756 } |
|
500023bd0818
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parents:
5963
diff
changeset
|
4757 |
|
500023bd0818
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parents:
5963
diff
changeset
|
4758 assert(pss.refs()->is_empty(), "should be empty"); |
|
500023bd0818
7143511: G1: Another instance of high GC Worker Other time (50ms)
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5963
diff
changeset
|
4759 |
|
500023bd0818
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parents:
5963
diff
changeset
|
4760 // Close the inner scope so that the ResourceMark and HandleMark |
|
500023bd0818
7143511: G1: Another instance of high GC Worker Other time (50ms)
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parents:
5963
diff
changeset
|
4761 // destructors are executed here and are included as part of the |
|
500023bd0818
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5963
diff
changeset
|
4762 // "GC Worker Time". |
| 342 | 4763 } |
| 4764 | |
| 1611 | 4765 double end_time_ms = os::elapsedTime() * 1000.0; |
|
4728
441e946dc1af
7121618: Change type of number of GC workers to unsigned int.
jmasa
parents:
4711
diff
changeset
|
4766 _g1h->g1_policy()->record_gc_worker_end_time(worker_id, end_time_ms); |
| 342 | 4767 } |
| 4768 }; | |
| 4769 | |
| 4770 // *** Common G1 Evacuation Stuff | |
| 4771 | |
|
5986
500023bd0818
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parents:
5963
diff
changeset
|
4772 // Closures that support the filtering of CodeBlobs scanned during |
|
500023bd0818
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5963
diff
changeset
|
4773 // external root scanning. |
|
500023bd0818
7143511: G1: Another instance of high GC Worker Other time (50ms)
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parents:
5963
diff
changeset
|
4774 |
|
500023bd0818
7143511: G1: Another instance of high GC Worker Other time (50ms)
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parents:
5963
diff
changeset
|
4775 // Closure applied to reference fields in code blobs (specifically nmethods) |
|
500023bd0818
7143511: G1: Another instance of high GC Worker Other time (50ms)
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parents:
5963
diff
changeset
|
4776 // to determine whether an nmethod contains references that point into |
|
500023bd0818
7143511: G1: Another instance of high GC Worker Other time (50ms)
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5963
diff
changeset
|
4777 // the collection set. Used as a predicate when walking code roots so |
|
500023bd0818
7143511: G1: Another instance of high GC Worker Other time (50ms)
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parents:
5963
diff
changeset
|
4778 // that only nmethods that point into the collection set are added to the |
|
500023bd0818
7143511: G1: Another instance of high GC Worker Other time (50ms)
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5963
diff
changeset
|
4779 // 'marked' list. |
|
500023bd0818
7143511: G1: Another instance of high GC Worker Other time (50ms)
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5963
diff
changeset
|
4780 |
|
500023bd0818
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5963
diff
changeset
|
4781 class G1FilteredCodeBlobToOopClosure : public CodeBlobToOopClosure { |
|
500023bd0818
7143511: G1: Another instance of high GC Worker Other time (50ms)
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parents:
5963
diff
changeset
|
4782 |
|
500023bd0818
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5963
diff
changeset
|
4783 class G1PointsIntoCSOopClosure : public OopClosure { |
|
500023bd0818
7143511: G1: Another instance of high GC Worker Other time (50ms)
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parents:
5963
diff
changeset
|
4784 G1CollectedHeap* _g1; |
|
500023bd0818
7143511: G1: Another instance of high GC Worker Other time (50ms)
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5963
diff
changeset
|
4785 bool _points_into_cs; |
|
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diff
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|
4786 public: |
|
500023bd0818
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5963
diff
changeset
|
4787 G1PointsIntoCSOopClosure(G1CollectedHeap* g1) : |
|
500023bd0818
7143511: G1: Another instance of high GC Worker Other time (50ms)
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5963
diff
changeset
|
4788 _g1(g1), _points_into_cs(false) { } |
|
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7143511: G1: Another instance of high GC Worker Other time (50ms)
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5963
diff
changeset
|
4789 |
|
500023bd0818
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5963
diff
changeset
|
4790 bool points_into_cs() const { return _points_into_cs; } |
|
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5963
diff
changeset
|
4791 |
|
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5963
diff
changeset
|
4792 template <class T> |
|
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5963
diff
changeset
|
4793 void do_oop_nv(T* p) { |
|
500023bd0818
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5963
diff
changeset
|
4794 if (!_points_into_cs) { |
|
500023bd0818
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5963
diff
changeset
|
4795 T heap_oop = oopDesc::load_heap_oop(p); |
|
500023bd0818
7143511: G1: Another instance of high GC Worker Other time (50ms)
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5963
diff
changeset
|
4796 if (!oopDesc::is_null(heap_oop) && |
|
500023bd0818
7143511: G1: Another instance of high GC Worker Other time (50ms)
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5963
diff
changeset
|
4797 _g1->in_cset_fast_test(oopDesc::decode_heap_oop_not_null(heap_oop))) { |
|
500023bd0818
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5963
diff
changeset
|
4798 _points_into_cs = true; |
|
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5963
diff
changeset
|
4799 } |
|
500023bd0818
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diff
changeset
|
4800 } |
|
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5963
diff
changeset
|
4801 } |
|
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5963
diff
changeset
|
4802 |
|
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5963
diff
changeset
|
4803 virtual void do_oop(oop* p) { do_oop_nv(p); } |
|
500023bd0818
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5963
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changeset
|
4804 virtual void do_oop(narrowOop* p) { do_oop_nv(p); } |
|
500023bd0818
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diff
changeset
|
4805 }; |
|
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diff
changeset
|
4806 |
|
500023bd0818
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5963
diff
changeset
|
4807 G1CollectedHeap* _g1; |
|
500023bd0818
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5963
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|
4808 |
|
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diff
changeset
|
4809 public: |
|
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5963
diff
changeset
|
4810 G1FilteredCodeBlobToOopClosure(G1CollectedHeap* g1, OopClosure* cl) : |
|
500023bd0818
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5963
diff
changeset
|
4811 CodeBlobToOopClosure(cl, true), _g1(g1) { } |
|
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5963
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|
4812 |
|
500023bd0818
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changeset
|
4813 virtual void do_code_blob(CodeBlob* cb) { |
|
500023bd0818
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5963
diff
changeset
|
4814 nmethod* nm = cb->as_nmethod_or_null(); |
|
500023bd0818
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|
4815 if (nm != NULL && !(nm->test_oops_do_mark())) { |
|
500023bd0818
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diff
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|
4816 G1PointsIntoCSOopClosure predicate_cl(_g1); |
|
500023bd0818
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5963
diff
changeset
|
4817 nm->oops_do(&predicate_cl); |
|
500023bd0818
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5963
diff
changeset
|
4818 |
|
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parents:
5963
diff
changeset
|
4819 if (predicate_cl.points_into_cs()) { |
|
500023bd0818
7143511: G1: Another instance of high GC Worker Other time (50ms)
johnc
parents:
5963
diff
changeset
|
4820 // At least one of the reference fields or the oop relocations |
|
500023bd0818
7143511: G1: Another instance of high GC Worker Other time (50ms)
johnc
parents:
5963
diff
changeset
|
4821 // in the nmethod points into the collection set. We have to |
|
500023bd0818
7143511: G1: Another instance of high GC Worker Other time (50ms)
johnc
parents:
5963
diff
changeset
|
4822 // 'mark' this nmethod. |
|
500023bd0818
7143511: G1: Another instance of high GC Worker Other time (50ms)
johnc
parents:
5963
diff
changeset
|
4823 // Note: Revisit the following if CodeBlobToOopClosure::do_code_blob() |
|
500023bd0818
7143511: G1: Another instance of high GC Worker Other time (50ms)
johnc
parents:
5963
diff
changeset
|
4824 // or MarkingCodeBlobClosure::do_code_blob() change. |
|
500023bd0818
7143511: G1: Another instance of high GC Worker Other time (50ms)
johnc
parents:
5963
diff
changeset
|
4825 if (!nm->test_set_oops_do_mark()) { |
|
500023bd0818
7143511: G1: Another instance of high GC Worker Other time (50ms)
johnc
parents:
5963
diff
changeset
|
4826 do_newly_marked_nmethod(nm); |
|
500023bd0818
7143511: G1: Another instance of high GC Worker Other time (50ms)
johnc
parents:
5963
diff
changeset
|
4827 } |
|
500023bd0818
7143511: G1: Another instance of high GC Worker Other time (50ms)
johnc
parents:
5963
diff
changeset
|
4828 } |
|
500023bd0818
7143511: G1: Another instance of high GC Worker Other time (50ms)
johnc
parents:
5963
diff
changeset
|
4829 } |
|
500023bd0818
7143511: G1: Another instance of high GC Worker Other time (50ms)
johnc
parents:
5963
diff
changeset
|
4830 } |
|
500023bd0818
7143511: G1: Another instance of high GC Worker Other time (50ms)
johnc
parents:
5963
diff
changeset
|
4831 }; |
|
500023bd0818
7143511: G1: Another instance of high GC Worker Other time (50ms)
johnc
parents:
5963
diff
changeset
|
4832 |
|
1833
8b10f48633dc
6984287: Regularize how GC parallel workers are specified.
jmasa
parents:
1755
diff
changeset
|
4833 // This method is run in a GC worker. |
|
8b10f48633dc
6984287: Regularize how GC parallel workers are specified.
jmasa
parents:
1755
diff
changeset
|
4834 |
| 342 | 4835 void |
| 4836 G1CollectedHeap:: | |
| 4837 g1_process_strong_roots(bool collecting_perm_gen, | |
|
4910
caa4652b4414
7129892: G1: explicit marking cycle initiation might fail to initiate a marking cycle
tonyp
parents:
4875
diff
changeset
|
4838 ScanningOption so, |
| 342 | 4839 OopClosure* scan_non_heap_roots, |
| 4840 OopsInHeapRegionClosure* scan_rs, | |
| 4841 OopsInGenClosure* scan_perm, | |
| 4842 int worker_i) { | |
|
3979
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
4843 |
| 342 | 4844 // First scan the strong roots, including the perm gen. |
| 4845 double ext_roots_start = os::elapsedTime(); | |
| 4846 double closure_app_time_sec = 0.0; | |
| 4847 | |
| 4848 BufferingOopClosure buf_scan_non_heap_roots(scan_non_heap_roots); | |
| 4849 BufferingOopsInGenClosure buf_scan_perm(scan_perm); | |
| 4850 buf_scan_perm.set_generation(perm_gen()); | |
| 4851 | |
|
989
148e5441d916
6863023: need non-perm oops in code cache for JSR 292
jrose
parents:
890
diff
changeset
|
4852 // Walk the code cache w/o buffering, because StarTask cannot handle |
|
148e5441d916
6863023: need non-perm oops in code cache for JSR 292
jrose
parents:
890
diff
changeset
|
4853 // unaligned oop locations. |
|
5986
500023bd0818
7143511: G1: Another instance of high GC Worker Other time (50ms)
johnc
parents:
5963
diff
changeset
|
4854 G1FilteredCodeBlobToOopClosure eager_scan_code_roots(this, scan_non_heap_roots); |
|
989
148e5441d916
6863023: need non-perm oops in code cache for JSR 292
jrose
parents:
890
diff
changeset
|
4855 |
|
148e5441d916
6863023: need non-perm oops in code cache for JSR 292
jrose
parents:
890
diff
changeset
|
4856 process_strong_roots(false, // no scoping; this is parallel code |
|
148e5441d916
6863023: need non-perm oops in code cache for JSR 292
jrose
parents:
890
diff
changeset
|
4857 collecting_perm_gen, so, |
| 342 | 4858 &buf_scan_non_heap_roots, |
|
989
148e5441d916
6863023: need non-perm oops in code cache for JSR 292
jrose
parents:
890
diff
changeset
|
4859 &eager_scan_code_roots, |
| 342 | 4860 &buf_scan_perm); |
|
1394
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
4861 |
|
3979
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
4862 // Now the CM ref_processor roots. |
|
3823
14a2fd14c0db
7068240: G1: Long "parallel other time" and "ext root scanning" when running specific benchmark
johnc
parents:
3778
diff
changeset
|
4863 if (!_process_strong_tasks->is_task_claimed(G1H_PS_refProcessor_oops_do)) { |
|
3979
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
4864 // We need to treat the discovered reference lists of the |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
4865 // concurrent mark ref processor as roots and keep entries |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
4866 // (which are added by the marking threads) on them live |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
4867 // until they can be processed at the end of marking. |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
4868 ref_processor_cm()->weak_oops_do(&buf_scan_non_heap_roots); |
|
3823
14a2fd14c0db
7068240: G1: Long "parallel other time" and "ext root scanning" when running specific benchmark
johnc
parents:
3778
diff
changeset
|
4869 } |
|
14a2fd14c0db
7068240: G1: Long "parallel other time" and "ext root scanning" when running specific benchmark
johnc
parents:
3778
diff
changeset
|
4870 |
|
14a2fd14c0db
7068240: G1: Long "parallel other time" and "ext root scanning" when running specific benchmark
johnc
parents:
3778
diff
changeset
|
4871 // Finish up any enqueued closure apps (attributed as object copy time). |
| 342 | 4872 buf_scan_non_heap_roots.done(); |
| 4873 buf_scan_perm.done(); | |
|
3823
14a2fd14c0db
7068240: G1: Long "parallel other time" and "ext root scanning" when running specific benchmark
johnc
parents:
3778
diff
changeset
|
4874 |
| 342 | 4875 double ext_roots_end = os::elapsedTime(); |
|
3823
14a2fd14c0db
7068240: G1: Long "parallel other time" and "ext root scanning" when running specific benchmark
johnc
parents:
3778
diff
changeset
|
4876 |
| 342 | 4877 g1_policy()->reset_obj_copy_time(worker_i); |
|
3823
14a2fd14c0db
7068240: G1: Long "parallel other time" and "ext root scanning" when running specific benchmark
johnc
parents:
3778
diff
changeset
|
4878 double obj_copy_time_sec = buf_scan_perm.closure_app_seconds() + |
|
14a2fd14c0db
7068240: G1: Long "parallel other time" and "ext root scanning" when running specific benchmark
johnc
parents:
3778
diff
changeset
|
4879 buf_scan_non_heap_roots.closure_app_seconds(); |
| 342 | 4880 g1_policy()->record_obj_copy_time(worker_i, obj_copy_time_sec * 1000.0); |
|
3823
14a2fd14c0db
7068240: G1: Long "parallel other time" and "ext root scanning" when running specific benchmark
johnc
parents:
3778
diff
changeset
|
4881 |
| 342 | 4882 double ext_root_time_ms = |
| 4883 ((ext_roots_end - ext_roots_start) - obj_copy_time_sec) * 1000.0; | |
|
3823
14a2fd14c0db
7068240: G1: Long "parallel other time" and "ext root scanning" when running specific benchmark
johnc
parents:
3778
diff
changeset
|
4884 |
| 342 | 4885 g1_policy()->record_ext_root_scan_time(worker_i, ext_root_time_ms); |
| 4886 | |
|
4787
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
4785
diff
changeset
|
4887 // 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
|
4888 // 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
|
4889 // as implicitly live). |
|
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
4785
diff
changeset
|
4890 if (!_process_strong_tasks->is_task_claimed(G1H_PS_filter_satb_buffers)) { |
|
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
4785
diff
changeset
|
4891 if (mark_in_progress()) { |
|
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
4785
diff
changeset
|
4892 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
|
4893 } |
|
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
4785
diff
changeset
|
4894 } |
|
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
4785
diff
changeset
|
4895 double satb_filtering_ms = (os::elapsedTime() - ext_roots_end) * 1000.0; |
|
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
4785
diff
changeset
|
4896 g1_policy()->record_satb_filtering_time(worker_i, satb_filtering_ms); |
| 342 | 4897 |
| 4898 // Now scan the complement of the collection set. | |
| 4899 if (scan_rs != NULL) { | |
| 4900 g1_rem_set()->oops_into_collection_set_do(scan_rs, worker_i); | |
| 4901 } | |
|
3823
14a2fd14c0db
7068240: G1: Long "parallel other time" and "ext root scanning" when running specific benchmark
johnc
parents:
3778
diff
changeset
|
4902 |
| 342 | 4903 _process_strong_tasks->all_tasks_completed(); |
| 4904 } | |
| 4905 | |
| 4906 void | |
| 4907 G1CollectedHeap::g1_process_weak_roots(OopClosure* root_closure, | |
| 4908 OopClosure* non_root_closure) { | |
|
989
148e5441d916
6863023: need non-perm oops in code cache for JSR 292
jrose
parents:
890
diff
changeset
|
4909 CodeBlobToOopClosure roots_in_blobs(root_closure, /*do_marking=*/ false); |
|
148e5441d916
6863023: need non-perm oops in code cache for JSR 292
jrose
parents:
890
diff
changeset
|
4910 SharedHeap::process_weak_roots(root_closure, &roots_in_blobs, non_root_closure); |
| 342 | 4911 } |
| 4912 | |
|
3979
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
4913 // Weak Reference Processing support |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
4914 |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
4915 // An always "is_alive" closure that is used to preserve referents. |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
4916 // If the object is non-null then it's alive. Used in the preservation |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
4917 // of referent objects that are pointed to by reference objects |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
4918 // discovered by the CM ref processor. |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
4919 class G1AlwaysAliveClosure: public BoolObjectClosure { |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
4920 G1CollectedHeap* _g1; |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
4921 public: |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
4922 G1AlwaysAliveClosure(G1CollectedHeap* g1) : _g1(g1) {} |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
4923 void do_object(oop p) { assert(false, "Do not call."); } |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
4924 bool do_object_b(oop p) { |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
4925 if (p != NULL) { |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
4926 return true; |
|
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 return false; |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
4929 } |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
4930 }; |
|
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 bool G1STWIsAliveClosure::do_object_b(oop p) { |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
4933 // An object is reachable if it is outside the collection set, |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
4934 // or is inside and copied. |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
4935 return !_g1->obj_in_cs(p) || p->is_forwarded(); |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
4936 } |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
4937 |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
4938 // Non Copying Keep Alive closure |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
4939 class G1KeepAliveClosure: public OopClosure { |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
4940 G1CollectedHeap* _g1; |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
4941 public: |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
4942 G1KeepAliveClosure(G1CollectedHeap* g1) : _g1(g1) {} |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
4943 void do_oop(narrowOop* p) { guarantee(false, "Not needed"); } |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
4944 void do_oop( oop* p) { |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
4945 oop obj = *p; |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
4946 |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
4947 if (_g1->obj_in_cs(obj)) { |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
4948 assert( obj->is_forwarded(), "invariant" ); |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
4949 *p = obj->forwardee(); |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
4950 } |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
4951 } |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
4952 }; |
|
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 // Copying Keep Alive closure - can be called from both |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
4955 // serial and parallel code as long as different worker |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
4956 // threads utilize different G1ParScanThreadState instances |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
4957 // and different queues. |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
4958 |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
4959 class G1CopyingKeepAliveClosure: public OopClosure { |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
4960 G1CollectedHeap* _g1h; |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
4961 OopClosure* _copy_non_heap_obj_cl; |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
4962 OopsInHeapRegionClosure* _copy_perm_obj_cl; |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
4963 G1ParScanThreadState* _par_scan_state; |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
4964 |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
4965 public: |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
4966 G1CopyingKeepAliveClosure(G1CollectedHeap* g1h, |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
4967 OopClosure* non_heap_obj_cl, |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
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|
4968 OopsInHeapRegionClosure* perm_obj_cl, |
|
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|
4969 G1ParScanThreadState* pss): |
|
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diff
changeset
|
4970 _g1h(g1h), |
|
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parents:
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diff
changeset
|
4971 _copy_non_heap_obj_cl(non_heap_obj_cl), |
|
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parents:
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changeset
|
4972 _copy_perm_obj_cl(perm_obj_cl), |
|
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changeset
|
4973 _par_scan_state(pss) |
|
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changeset
|
4974 {} |
|
4dfb2df418f2
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parents:
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diff
changeset
|
4975 |
|
4dfb2df418f2
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parents:
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diff
changeset
|
4976 virtual void do_oop(narrowOop* p) { do_oop_work(p); } |
|
4dfb2df418f2
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changeset
|
4977 virtual void do_oop( oop* p) { do_oop_work(p); } |
|
4dfb2df418f2
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changeset
|
4978 |
|
4dfb2df418f2
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parents:
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diff
changeset
|
4979 template <class T> void do_oop_work(T* p) { |
|
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changeset
|
4980 oop obj = oopDesc::load_decode_heap_oop(p); |
|
4dfb2df418f2
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changeset
|
4981 |
|
4dfb2df418f2
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diff
changeset
|
4982 if (_g1h->obj_in_cs(obj)) { |
|
4dfb2df418f2
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changeset
|
4983 // If the referent object has been forwarded (either copied |
|
4dfb2df418f2
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changeset
|
4984 // to a new location or to itself in the event of an |
|
4dfb2df418f2
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changeset
|
4985 // evacuation failure) then we need to update the reference |
|
4dfb2df418f2
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changeset
|
4986 // field and, if both reference and referent are in the G1 |
|
4dfb2df418f2
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changeset
|
4987 // heap, update the RSet for the referent. |
|
4dfb2df418f2
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parents:
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changeset
|
4988 // |
|
4dfb2df418f2
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changeset
|
4989 // If the referent has not been forwarded then we have to keep |
|
4dfb2df418f2
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changeset
|
4990 // it alive by policy. Therefore we have copy the referent. |
|
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|
4991 // |
|
4dfb2df418f2
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changeset
|
4992 // If the reference field is in the G1 heap then we can push |
|
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changeset
|
4993 // on the PSS queue. When the queue is drained (after each |
|
4dfb2df418f2
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changeset
|
4994 // phase of reference processing) the object and it's followers |
|
4dfb2df418f2
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|
4995 // will be copied, the reference field set to point to the |
|
4dfb2df418f2
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changeset
|
4996 // new location, and the RSet updated. Otherwise we need to |
|
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changeset
|
4997 // use the the non-heap or perm closures directly to copy |
|
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changeset
|
4998 // the refernt object and update the pointer, while avoiding |
|
4dfb2df418f2
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parents:
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changeset
|
4999 // updating the RSet. |
|
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parents:
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changeset
|
5000 |
|
4dfb2df418f2
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parents:
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changeset
|
5001 if (_g1h->is_in_g1_reserved(p)) { |
|
4dfb2df418f2
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parents:
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changeset
|
5002 _par_scan_state->push_on_queue(p); |
|
4dfb2df418f2
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parents:
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diff
changeset
|
5003 } else { |
|
4dfb2df418f2
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parents:
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diff
changeset
|
5004 // The reference field is not in the G1 heap. |
|
4dfb2df418f2
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parents:
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diff
changeset
|
5005 if (_g1h->perm_gen()->is_in(p)) { |
|
4dfb2df418f2
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parents:
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changeset
|
5006 _copy_perm_obj_cl->do_oop(p); |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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parents:
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diff
changeset
|
5007 } else { |
|
4dfb2df418f2
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parents:
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diff
changeset
|
5008 _copy_non_heap_obj_cl->do_oop(p); |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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parents:
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diff
changeset
|
5009 } |
|
4dfb2df418f2
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parents:
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diff
changeset
|
5010 } |
|
4dfb2df418f2
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parents:
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diff
changeset
|
5011 } |
|
4dfb2df418f2
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parents:
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diff
changeset
|
5012 } |
|
4dfb2df418f2
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parents:
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diff
changeset
|
5013 }; |
|
4dfb2df418f2
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parents:
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diff
changeset
|
5014 |
|
4dfb2df418f2
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parents:
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diff
changeset
|
5015 // Serial drain queue closure. Called as the 'complete_gc' |
|
4dfb2df418f2
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parents:
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diff
changeset
|
5016 // closure for each discovered list in some of the |
|
4dfb2df418f2
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parents:
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diff
changeset
|
5017 // reference processing phases. |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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parents:
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diff
changeset
|
5018 |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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parents:
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diff
changeset
|
5019 class G1STWDrainQueueClosure: public VoidClosure { |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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parents:
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diff
changeset
|
5020 protected: |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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parents:
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diff
changeset
|
5021 G1CollectedHeap* _g1h; |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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parents:
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diff
changeset
|
5022 G1ParScanThreadState* _par_scan_state; |
|
4dfb2df418f2
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parents:
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diff
changeset
|
5023 |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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parents:
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diff
changeset
|
5024 G1ParScanThreadState* par_scan_state() { return _par_scan_state; } |
|
4dfb2df418f2
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johnc
parents:
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diff
changeset
|
5025 |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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parents:
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diff
changeset
|
5026 public: |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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parents:
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diff
changeset
|
5027 G1STWDrainQueueClosure(G1CollectedHeap* g1h, G1ParScanThreadState* pss) : |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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parents:
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diff
changeset
|
5028 _g1h(g1h), |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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parents:
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diff
changeset
|
5029 _par_scan_state(pss) |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
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diff
changeset
|
5030 { } |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
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diff
changeset
|
5031 |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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parents:
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diff
changeset
|
5032 void do_void() { |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5033 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
|
5034 pss->trim_queue(); |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5035 } |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
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diff
changeset
|
5036 }; |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5037 |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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parents:
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diff
changeset
|
5038 // Parallel Reference Processing closures |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5039 |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
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diff
changeset
|
5040 // Implementation of AbstractRefProcTaskExecutor for parallel reference |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5041 // processing during G1 evacuation pauses. |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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parents:
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diff
changeset
|
5042 |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
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diff
changeset
|
5043 class G1STWRefProcTaskExecutor: public AbstractRefProcTaskExecutor { |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5044 private: |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5045 G1CollectedHeap* _g1h; |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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parents:
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diff
changeset
|
5046 RefToScanQueueSet* _queues; |
|
4095
bca17e38de00
6593758: RFE: Enhance GC ergonomics to dynamically choose ParallelGCThreads
jmasa
parents:
4090
diff
changeset
|
5047 FlexibleWorkGang* _workers; |
|
3979
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5048 int _active_workers; |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5049 |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5050 public: |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5051 G1STWRefProcTaskExecutor(G1CollectedHeap* g1h, |
|
4095
bca17e38de00
6593758: RFE: Enhance GC ergonomics to dynamically choose ParallelGCThreads
jmasa
parents:
4090
diff
changeset
|
5052 FlexibleWorkGang* workers, |
|
3979
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5053 RefToScanQueueSet *task_queues, |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5054 int n_workers) : |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5055 _g1h(g1h), |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5056 _queues(task_queues), |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5057 _workers(workers), |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5058 _active_workers(n_workers) |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5059 { |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
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diff
changeset
|
5060 assert(n_workers > 0, "shouldn't call this otherwise"); |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5061 } |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
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diff
changeset
|
5062 |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
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diff
changeset
|
5063 // Executes the given task using concurrent marking worker threads. |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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parents:
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diff
changeset
|
5064 virtual void execute(ProcessTask& task); |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5065 virtual void execute(EnqueueTask& task); |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5066 }; |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5067 |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5068 // Gang task for possibly parallel reference processing |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5069 |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
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diff
changeset
|
5070 class G1STWRefProcTaskProxy: public AbstractGangTask { |
|
4dfb2df418f2
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parents:
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diff
changeset
|
5071 typedef AbstractRefProcTaskExecutor::ProcessTask ProcessTask; |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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parents:
3973
diff
changeset
|
5072 ProcessTask& _proc_task; |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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parents:
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diff
changeset
|
5073 G1CollectedHeap* _g1h; |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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parents:
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diff
changeset
|
5074 RefToScanQueueSet *_task_queues; |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
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diff
changeset
|
5075 ParallelTaskTerminator* _terminator; |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5076 |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5077 public: |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5078 G1STWRefProcTaskProxy(ProcessTask& proc_task, |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5079 G1CollectedHeap* g1h, |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
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diff
changeset
|
5080 RefToScanQueueSet *task_queues, |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5081 ParallelTaskTerminator* terminator) : |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5082 AbstractGangTask("Process reference objects in parallel"), |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5083 _proc_task(proc_task), |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5084 _g1h(g1h), |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5085 _task_queues(task_queues), |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5086 _terminator(terminator) |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5087 {} |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5088 |
|
4728
441e946dc1af
7121618: Change type of number of GC workers to unsigned int.
jmasa
parents:
4711
diff
changeset
|
5089 virtual void work(uint worker_id) { |
|
3979
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5090 // The reference processing task executed by a single worker. |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5091 ResourceMark rm; |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5092 HandleMark hm; |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5093 |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5094 G1STWIsAliveClosure is_alive(_g1h); |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5095 |
|
4728
441e946dc1af
7121618: Change type of number of GC workers to unsigned int.
jmasa
parents:
4711
diff
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|
5096 G1ParScanThreadState pss(_g1h, worker_id); |
|
3979
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|
5097 |
|
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|
5098 G1ParScanHeapEvacClosure scan_evac_cl(_g1h, &pss, NULL); |
|
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|
5099 G1ParScanHeapEvacFailureClosure evac_failure_cl(_g1h, &pss, NULL); |
|
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|
5100 G1ParScanPartialArrayClosure partial_scan_cl(_g1h, &pss, NULL); |
|
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|
5101 |
|
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|
5102 pss.set_evac_closure(&scan_evac_cl); |
|
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|
5103 pss.set_evac_failure_closure(&evac_failure_cl); |
|
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|
5104 pss.set_partial_scan_closure(&partial_scan_cl); |
|
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changeset
|
5105 |
|
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|
5106 G1ParScanExtRootClosure only_copy_non_heap_cl(_g1h, &pss, NULL); |
|
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|
5107 G1ParScanPermClosure only_copy_perm_cl(_g1h, &pss, NULL); |
|
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|
5108 |
|
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|
5109 G1ParScanAndMarkExtRootClosure copy_mark_non_heap_cl(_g1h, &pss, NULL); |
|
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|
5110 G1ParScanAndMarkPermClosure copy_mark_perm_cl(_g1h, &pss, NULL); |
|
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|
5111 |
|
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|
5112 OopClosure* copy_non_heap_cl = &only_copy_non_heap_cl; |
|
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|
5113 OopsInHeapRegionClosure* copy_perm_cl = &only_copy_perm_cl; |
|
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|
5114 |
|
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changeset
|
5115 if (_g1h->g1_policy()->during_initial_mark_pause()) { |
|
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|
5116 // We also need to mark copied objects. |
|
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|
5117 copy_non_heap_cl = ©_mark_non_heap_cl; |
|
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|
5118 copy_perm_cl = ©_mark_perm_cl; |
|
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|
5119 } |
|
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changeset
|
5120 |
|
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|
5121 // Keep alive closure. |
|
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|
5122 G1CopyingKeepAliveClosure keep_alive(_g1h, copy_non_heap_cl, copy_perm_cl, &pss); |
|
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|
5123 |
|
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|
5124 // Complete GC closure |
|
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|
5125 G1ParEvacuateFollowersClosure drain_queue(_g1h, &pss, _task_queues, _terminator); |
|
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|
5126 |
|
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|
5127 // Call the reference processing task's work routine. |
|
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|
5128 _proc_task.work(worker_id, is_alive, keep_alive, drain_queue); |
|
3979
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|
5129 |
|
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|
5130 // Note we cannot assert that the refs array is empty here as not all |
|
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|
5131 // of the processing tasks (specifically phase2 - pp2_work) execute |
|
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|
5132 // the complete_gc closure (which ordinarily would drain the queue) so |
|
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|
5133 // the queue may not be empty. |
|
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|
5134 } |
|
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changeset
|
5135 }; |
|
4dfb2df418f2
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diff
changeset
|
5136 |
|
4dfb2df418f2
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|
5137 // Driver routine for parallel reference processing. |
|
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|
5138 // Creates an instance of the ref processing gang |
|
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changeset
|
5139 // task and has the worker threads execute it. |
|
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|
5140 void G1STWRefProcTaskExecutor::execute(ProcessTask& proc_task) { |
|
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changeset
|
5141 assert(_workers != NULL, "Need parallel worker threads."); |
|
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|
5142 |
|
4dfb2df418f2
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changeset
|
5143 ParallelTaskTerminator terminator(_active_workers, _queues); |
|
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|
5144 G1STWRefProcTaskProxy proc_task_proxy(proc_task, _g1h, _queues, &terminator); |
|
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changeset
|
5145 |
|
4dfb2df418f2
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changeset
|
5146 _g1h->set_par_threads(_active_workers); |
|
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|
5147 _workers->run_task(&proc_task_proxy); |
|
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|
5148 _g1h->set_par_threads(0); |
|
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|
5149 } |
|
4dfb2df418f2
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diff
changeset
|
5150 |
|
4dfb2df418f2
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changeset
|
5151 // Gang task for parallel reference enqueueing. |
|
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changeset
|
5152 |
|
4dfb2df418f2
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changeset
|
5153 class G1STWRefEnqueueTaskProxy: public AbstractGangTask { |
|
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|
5154 typedef AbstractRefProcTaskExecutor::EnqueueTask EnqueueTask; |
|
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|
5155 EnqueueTask& _enq_task; |
|
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changeset
|
5156 |
|
4dfb2df418f2
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diff
changeset
|
5157 public: |
|
4dfb2df418f2
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diff
changeset
|
5158 G1STWRefEnqueueTaskProxy(EnqueueTask& enq_task) : |
|
4dfb2df418f2
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changeset
|
5159 AbstractGangTask("Enqueue reference objects in parallel"), |
|
4dfb2df418f2
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changeset
|
5160 _enq_task(enq_task) |
|
4dfb2df418f2
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|
5161 { } |
|
4dfb2df418f2
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diff
changeset
|
5162 |
|
4728
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|
5163 virtual void work(uint worker_id) { |
|
441e946dc1af
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|
5164 _enq_task.work(worker_id); |
|
3979
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|
5165 } |
|
4dfb2df418f2
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parents:
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diff
changeset
|
5166 }; |
|
4dfb2df418f2
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parents:
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diff
changeset
|
5167 |
|
4dfb2df418f2
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diff
changeset
|
5168 // Driver routine for parallel reference enqueing. |
|
4dfb2df418f2
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changeset
|
5169 // Creates an instance of the ref enqueueing gang |
|
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changeset
|
5170 // task and has the worker threads execute it. |
|
4dfb2df418f2
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changeset
|
5171 |
|
4dfb2df418f2
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diff
changeset
|
5172 void G1STWRefProcTaskExecutor::execute(EnqueueTask& enq_task) { |
|
4dfb2df418f2
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changeset
|
5173 assert(_workers != NULL, "Need parallel worker threads."); |
|
4dfb2df418f2
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changeset
|
5174 |
|
4dfb2df418f2
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diff
changeset
|
5175 G1STWRefEnqueueTaskProxy enq_task_proxy(enq_task); |
|
4dfb2df418f2
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changeset
|
5176 |
|
4dfb2df418f2
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parents:
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diff
changeset
|
5177 _g1h->set_par_threads(_active_workers); |
|
4dfb2df418f2
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changeset
|
5178 _workers->run_task(&enq_task_proxy); |
|
4dfb2df418f2
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changeset
|
5179 _g1h->set_par_threads(0); |
|
4dfb2df418f2
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|
5180 } |
|
4dfb2df418f2
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parents:
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diff
changeset
|
5181 |
|
4dfb2df418f2
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diff
changeset
|
5182 // End of weak reference support closures |
|
4dfb2df418f2
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diff
changeset
|
5183 |
|
4dfb2df418f2
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diff
changeset
|
5184 // Abstract task used to preserve (i.e. copy) any referent objects |
|
4dfb2df418f2
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|
5185 // that are in the collection set and are pointed to by reference |
|
4dfb2df418f2
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diff
changeset
|
5186 // objects discovered by the CM ref processor. |
|
4dfb2df418f2
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diff
changeset
|
5187 |
|
4dfb2df418f2
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diff
changeset
|
5188 class G1ParPreserveCMReferentsTask: public AbstractGangTask { |
|
4dfb2df418f2
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diff
changeset
|
5189 protected: |
|
4dfb2df418f2
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diff
changeset
|
5190 G1CollectedHeap* _g1h; |
|
4dfb2df418f2
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diff
changeset
|
5191 RefToScanQueueSet *_queues; |
|
4dfb2df418f2
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changeset
|
5192 ParallelTaskTerminator _terminator; |
|
4728
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|
5193 uint _n_workers; |
|
3979
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changeset
|
5194 |
|
4dfb2df418f2
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diff
changeset
|
5195 public: |
|
4dfb2df418f2
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diff
changeset
|
5196 G1ParPreserveCMReferentsTask(G1CollectedHeap* g1h,int workers, RefToScanQueueSet *task_queues) : |
|
4dfb2df418f2
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changeset
|
5197 AbstractGangTask("ParPreserveCMReferents"), |
|
4dfb2df418f2
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changeset
|
5198 _g1h(g1h), |
|
4dfb2df418f2
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diff
changeset
|
5199 _queues(task_queues), |
|
4dfb2df418f2
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changeset
|
5200 _terminator(workers, _queues), |
|
4dfb2df418f2
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changeset
|
5201 _n_workers(workers) |
|
4dfb2df418f2
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diff
changeset
|
5202 { } |
|
4dfb2df418f2
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diff
changeset
|
5203 |
|
4728
441e946dc1af
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jmasa
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changeset
|
5204 void work(uint worker_id) { |
|
3979
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changeset
|
5205 ResourceMark rm; |
|
4dfb2df418f2
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diff
changeset
|
5206 HandleMark hm; |
|
4dfb2df418f2
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changeset
|
5207 |
|
4728
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jmasa
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changeset
|
5208 G1ParScanThreadState pss(_g1h, worker_id); |
|
3979
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|
5209 G1ParScanHeapEvacClosure scan_evac_cl(_g1h, &pss, NULL); |
|
4dfb2df418f2
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|
5210 G1ParScanHeapEvacFailureClosure evac_failure_cl(_g1h, &pss, NULL); |
|
4dfb2df418f2
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|
5211 G1ParScanPartialArrayClosure partial_scan_cl(_g1h, &pss, NULL); |
|
4dfb2df418f2
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|
5212 |
|
4dfb2df418f2
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changeset
|
5213 pss.set_evac_closure(&scan_evac_cl); |
|
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|
5214 pss.set_evac_failure_closure(&evac_failure_cl); |
|
4dfb2df418f2
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|
5215 pss.set_partial_scan_closure(&partial_scan_cl); |
|
4dfb2df418f2
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changeset
|
5216 |
|
4dfb2df418f2
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changeset
|
5217 assert(pss.refs()->is_empty(), "both queue and overflow should be empty"); |
|
4dfb2df418f2
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changeset
|
5218 |
|
4dfb2df418f2
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changeset
|
5219 |
|
4dfb2df418f2
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johnc
parents:
3973
diff
changeset
|
5220 G1ParScanExtRootClosure only_copy_non_heap_cl(_g1h, &pss, NULL); |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5221 G1ParScanPermClosure only_copy_perm_cl(_g1h, &pss, NULL); |
|
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 G1ParScanAndMarkExtRootClosure copy_mark_non_heap_cl(_g1h, &pss, NULL); |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5224 G1ParScanAndMarkPermClosure copy_mark_perm_cl(_g1h, &pss, NULL); |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5225 |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5226 OopClosure* copy_non_heap_cl = &only_copy_non_heap_cl; |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5227 OopsInHeapRegionClosure* copy_perm_cl = &only_copy_perm_cl; |
|
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 if (_g1h->g1_policy()->during_initial_mark_pause()) { |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5230 // We also need to mark copied objects. |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5231 copy_non_heap_cl = ©_mark_non_heap_cl; |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5232 copy_perm_cl = ©_mark_perm_cl; |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5233 } |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5234 |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5235 // Is alive closure |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
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diff
changeset
|
5236 G1AlwaysAliveClosure always_alive(_g1h); |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5237 |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5238 // Copying keep alive closure. Applied to referent objects that need |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5239 // to be copied. |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5240 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
|
5241 |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
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diff
changeset
|
5242 ReferenceProcessor* rp = _g1h->ref_processor_cm(); |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5243 |
|
4728
441e946dc1af
7121618: Change type of number of GC workers to unsigned int.
jmasa
parents:
4711
diff
changeset
|
5244 uint limit = ReferenceProcessor::number_of_subclasses_of_ref() * rp->max_num_q(); |
|
441e946dc1af
7121618: Change type of number of GC workers to unsigned int.
jmasa
parents:
4711
diff
changeset
|
5245 uint stride = MIN2(MAX2(_n_workers, 1U), limit); |
|
3979
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5246 |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5247 // limit is set using max_num_q() - which was set using ParallelGCThreads. |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5248 // So this must be true - but assert just in case someone decides to |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5249 // change the worker ids. |
|
4728
441e946dc1af
7121618: Change type of number of GC workers to unsigned int.
jmasa
parents:
4711
diff
changeset
|
5250 assert(0 <= worker_id && worker_id < limit, "sanity"); |
|
3979
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5251 assert(!rp->discovery_is_atomic(), "check this code"); |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5252 |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5253 // Select discovered lists [i, i+stride, i+2*stride,...,limit) |
|
4728
441e946dc1af
7121618: Change type of number of GC workers to unsigned int.
jmasa
parents:
4711
diff
changeset
|
5254 for (uint idx = worker_id; idx < limit; idx += stride) { |
|
4014
bf2d2b8b1726
7095243: Disambiguate ReferenceProcessor::_discoveredSoftRefs
johnc
parents:
4013
diff
changeset
|
5255 DiscoveredList& ref_list = rp->discovered_refs()[idx]; |
|
3979
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 DiscoveredListIterator iter(ref_list, &keep_alive, &always_alive); |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5258 while (iter.has_next()) { |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5259 // Since discovery is not atomic for the CM ref processor, we |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5260 // can see some null referent objects. |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5261 iter.load_ptrs(DEBUG_ONLY(true)); |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5262 oop ref = iter.obj(); |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5263 |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5264 // This will filter nulls. |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5265 if (iter.is_referent_alive()) { |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5266 iter.make_referent_alive(); |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5267 } |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5268 iter.move_to_next(); |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5269 } |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5270 } |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5271 |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5272 // Drain the queue - which may cause stealing |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5273 G1ParEvacuateFollowersClosure drain_queue(_g1h, &pss, _queues, &_terminator); |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5274 drain_queue.do_void(); |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5275 // Allocation buffers were retired at the end of G1ParEvacuateFollowersClosure |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5276 assert(pss.refs()->is_empty(), "should be"); |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5277 } |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5278 }; |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5279 |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5280 // Weak Reference processing during an evacuation pause (part 1). |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5281 void G1CollectedHeap::process_discovered_references() { |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5282 double ref_proc_start = os::elapsedTime(); |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5283 |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5284 ReferenceProcessor* rp = _ref_processor_stw; |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5285 assert(rp->discovery_enabled(), "should have been enabled"); |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5286 |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5287 // Any reference objects, in the collection set, that were 'discovered' |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5288 // 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
|
5289 // applying the external root copy closure to the discovered lists, or |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5290 // by following an RSet entry). |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5291 // |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5292 // 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
|
5293 // 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
|
5294 // processor would have seen that the reference object had already |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5295 // been 'discovered' and would have skipped discovering the reference, |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5296 // 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
|
5297 // 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
|
5298 // referent object. |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5299 // |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5300 // We need to explicitly copy these referent objects - the references |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5301 // will be processed at the end of remarking. |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5302 // |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5303 // 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
|
5304 // 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
|
5305 // referents points to another object which is also referenced by an |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5306 // object discovered by the STW ref processor. |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5307 |
|
4728
441e946dc1af
7121618: Change type of number of GC workers to unsigned int.
jmasa
parents:
4711
diff
changeset
|
5308 uint active_workers = (G1CollectedHeap::use_parallel_gc_threads() ? |
|
4095
bca17e38de00
6593758: RFE: Enhance GC ergonomics to dynamically choose ParallelGCThreads
jmasa
parents:
4090
diff
changeset
|
5309 workers()->active_workers() : 1); |
|
bca17e38de00
6593758: RFE: Enhance GC ergonomics to dynamically choose ParallelGCThreads
jmasa
parents:
4090
diff
changeset
|
5310 |
| 4711 | 5311 assert(!G1CollectedHeap::use_parallel_gc_threads() || |
| 5312 active_workers == workers()->active_workers(), | |
| 5313 "Need to reset active_workers"); | |
| 5314 | |
|
4095
bca17e38de00
6593758: RFE: Enhance GC ergonomics to dynamically choose ParallelGCThreads
jmasa
parents:
4090
diff
changeset
|
5315 set_par_threads(active_workers); |
|
bca17e38de00
6593758: RFE: Enhance GC ergonomics to dynamically choose ParallelGCThreads
jmasa
parents:
4090
diff
changeset
|
5316 G1ParPreserveCMReferentsTask keep_cm_referents(this, active_workers, _task_queues); |
|
3979
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5317 |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5318 if (G1CollectedHeap::use_parallel_gc_threads()) { |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5319 workers()->run_task(&keep_cm_referents); |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5320 } else { |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5321 keep_cm_referents.work(0); |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5322 } |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5323 |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5324 set_par_threads(0); |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5325 |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5326 // Closure to test whether a referent is alive. |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5327 G1STWIsAliveClosure is_alive(this); |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5328 |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5329 // Even when parallel reference processing is enabled, the processing |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5330 // 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
|
5331 // 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
|
5332 // JNI refs. |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5333 |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5334 // Use only a single queue for this PSS. |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5335 G1ParScanThreadState pss(this, 0); |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5336 |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5337 // We do not embed a reference processor in the copying/scanning |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5338 // closures while we're actually processing the discovered |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5339 // reference objects. |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5340 G1ParScanHeapEvacClosure scan_evac_cl(this, &pss, NULL); |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5341 G1ParScanHeapEvacFailureClosure evac_failure_cl(this, &pss, NULL); |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5342 G1ParScanPartialArrayClosure partial_scan_cl(this, &pss, NULL); |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5343 |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5344 pss.set_evac_closure(&scan_evac_cl); |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5345 pss.set_evac_failure_closure(&evac_failure_cl); |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5346 pss.set_partial_scan_closure(&partial_scan_cl); |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5347 |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5348 assert(pss.refs()->is_empty(), "pre-condition"); |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5349 |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5350 G1ParScanExtRootClosure only_copy_non_heap_cl(this, &pss, NULL); |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5351 G1ParScanPermClosure only_copy_perm_cl(this, &pss, NULL); |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5352 |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5353 G1ParScanAndMarkExtRootClosure copy_mark_non_heap_cl(this, &pss, NULL); |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5354 G1ParScanAndMarkPermClosure copy_mark_perm_cl(this, &pss, NULL); |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5355 |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5356 OopClosure* copy_non_heap_cl = &only_copy_non_heap_cl; |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5357 OopsInHeapRegionClosure* copy_perm_cl = &only_copy_perm_cl; |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5358 |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5359 if (_g1h->g1_policy()->during_initial_mark_pause()) { |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5360 // We also need to mark copied objects. |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5361 copy_non_heap_cl = ©_mark_non_heap_cl; |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5362 copy_perm_cl = ©_mark_perm_cl; |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5363 } |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5364 |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5365 // Keep alive closure. |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5366 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
|
5367 |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5368 // Serial Complete GC closure |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5369 G1STWDrainQueueClosure drain_queue(this, &pss); |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5370 |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5371 // Setup the soft refs policy... |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5372 rp->setup_policy(false); |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5373 |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5374 if (!rp->processing_is_mt()) { |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5375 // Serial reference processing... |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5376 rp->process_discovered_references(&is_alive, |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5377 &keep_alive, |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5378 &drain_queue, |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5379 NULL); |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5380 } else { |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5381 // Parallel reference processing |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5382 assert(rp->num_q() == active_workers, "sanity"); |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5383 assert(active_workers <= rp->max_num_q(), "sanity"); |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5384 |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5385 G1STWRefProcTaskExecutor par_task_executor(this, workers(), _task_queues, active_workers); |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5386 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
|
5387 } |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5388 |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5389 // We have completed copying any necessary live referent objects |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5390 // (that were not copied during the actual pause) so we can |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5391 // retire any active alloc buffers |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5392 pss.retire_alloc_buffers(); |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5393 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
|
5394 |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5395 double ref_proc_time = os::elapsedTime() - ref_proc_start; |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5396 g1_policy()->record_ref_proc_time(ref_proc_time * 1000.0); |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5397 } |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5398 |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5399 // Weak Reference processing during an evacuation pause (part 2). |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5400 void G1CollectedHeap::enqueue_discovered_references() { |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5401 double ref_enq_start = os::elapsedTime(); |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5402 |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5403 ReferenceProcessor* rp = _ref_processor_stw; |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5404 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
|
5405 |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5406 // Now enqueue any remaining on the discovered lists on to |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5407 // the pending list. |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5408 if (!rp->processing_is_mt()) { |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5409 // Serial reference processing... |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5410 rp->enqueue_discovered_references(); |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5411 } else { |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5412 // Parallel reference enqueuing |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5413 |
|
4728
441e946dc1af
7121618: Change type of number of GC workers to unsigned int.
jmasa
parents:
4711
diff
changeset
|
5414 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
|
5415 assert(active_workers == workers()->active_workers(), |
|
bca17e38de00
6593758: RFE: Enhance GC ergonomics to dynamically choose ParallelGCThreads
jmasa
parents:
4090
diff
changeset
|
5416 "Need to reset active_workers"); |
|
3979
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5417 assert(rp->num_q() == active_workers, "sanity"); |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5418 assert(active_workers <= rp->max_num_q(), "sanity"); |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5419 |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5420 G1STWRefProcTaskExecutor par_task_executor(this, workers(), _task_queues, active_workers); |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5421 rp->enqueue_discovered_references(&par_task_executor); |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5422 } |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5423 |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5424 rp->verify_no_references_recorded(); |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5425 assert(!rp->discovery_enabled(), "should have been disabled"); |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5426 |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5427 // FIXME |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5428 // 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
|
5429 // 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
|
5430 // and could signicantly increase the pause time. |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5431 |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5432 double ref_enq_time = os::elapsedTime() - ref_enq_start; |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5433 g1_policy()->record_ref_enq_time(ref_enq_time * 1000.0); |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5434 } |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5435 |
| 342 | 5436 void G1CollectedHeap::evacuate_collection_set() { |
|
4781
bacb651cf5bf
7113006: G1: excessive ergo output when an evac failure happens
tonyp
parents:
4728
diff
changeset
|
5437 _expand_heap_after_alloc_failure = true; |
| 342 | 5438 set_evacuation_failed(false); |
| 5439 | |
| 5440 g1_rem_set()->prepare_for_oops_into_collection_set_do(); | |
| 5441 concurrent_g1_refine()->set_use_cache(false); | |
| 889 | 5442 concurrent_g1_refine()->clear_hot_cache_claimed_index(); |
| 5443 | |
|
4728
441e946dc1af
7121618: Change type of number of GC workers to unsigned int.
jmasa
parents:
4711
diff
changeset
|
5444 uint n_workers; |
|
4095
bca17e38de00
6593758: RFE: Enhance GC ergonomics to dynamically choose ParallelGCThreads
jmasa
parents:
4090
diff
changeset
|
5445 if (G1CollectedHeap::use_parallel_gc_threads()) { |
|
bca17e38de00
6593758: RFE: Enhance GC ergonomics to dynamically choose ParallelGCThreads
jmasa
parents:
4090
diff
changeset
|
5446 n_workers = |
|
bca17e38de00
6593758: RFE: Enhance GC ergonomics to dynamically choose ParallelGCThreads
jmasa
parents:
4090
diff
changeset
|
5447 AdaptiveSizePolicy::calc_active_workers(workers()->total_workers(), |
|
bca17e38de00
6593758: RFE: Enhance GC ergonomics to dynamically choose ParallelGCThreads
jmasa
parents:
4090
diff
changeset
|
5448 workers()->active_workers(), |
|
bca17e38de00
6593758: RFE: Enhance GC ergonomics to dynamically choose ParallelGCThreads
jmasa
parents:
4090
diff
changeset
|
5449 Threads::number_of_non_daemon_threads()); |
|
bca17e38de00
6593758: RFE: Enhance GC ergonomics to dynamically choose ParallelGCThreads
jmasa
parents:
4090
diff
changeset
|
5450 assert(UseDynamicNumberOfGCThreads || |
|
bca17e38de00
6593758: RFE: Enhance GC ergonomics to dynamically choose ParallelGCThreads
jmasa
parents:
4090
diff
changeset
|
5451 n_workers == workers()->total_workers(), |
|
bca17e38de00
6593758: RFE: Enhance GC ergonomics to dynamically choose ParallelGCThreads
jmasa
parents:
4090
diff
changeset
|
5452 "If not dynamic should be using all the workers"); |
| 4711 | 5453 workers()->set_active_workers(n_workers); |
|
4095
bca17e38de00
6593758: RFE: Enhance GC ergonomics to dynamically choose ParallelGCThreads
jmasa
parents:
4090
diff
changeset
|
5454 set_par_threads(n_workers); |
|
bca17e38de00
6593758: RFE: Enhance GC ergonomics to dynamically choose ParallelGCThreads
jmasa
parents:
4090
diff
changeset
|
5455 } else { |
|
bca17e38de00
6593758: RFE: Enhance GC ergonomics to dynamically choose ParallelGCThreads
jmasa
parents:
4090
diff
changeset
|
5456 assert(n_par_threads() == 0, |
|
bca17e38de00
6593758: RFE: Enhance GC ergonomics to dynamically choose ParallelGCThreads
jmasa
parents:
4090
diff
changeset
|
5457 "Should be the original non-parallel value"); |
|
bca17e38de00
6593758: RFE: Enhance GC ergonomics to dynamically choose ParallelGCThreads
jmasa
parents:
4090
diff
changeset
|
5458 n_workers = 1; |
|
bca17e38de00
6593758: RFE: Enhance GC ergonomics to dynamically choose ParallelGCThreads
jmasa
parents:
4090
diff
changeset
|
5459 } |
|
bca17e38de00
6593758: RFE: Enhance GC ergonomics to dynamically choose ParallelGCThreads
jmasa
parents:
4090
diff
changeset
|
5460 |
|
bca17e38de00
6593758: RFE: Enhance GC ergonomics to dynamically choose ParallelGCThreads
jmasa
parents:
4090
diff
changeset
|
5461 G1ParTask g1_par_task(this, _task_queues); |
| 342 | 5462 |
| 5463 init_for_evac_failure(NULL); | |
| 5464 | |
| 5465 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
|
5466 |
|
4f360ec815ba
6720309: G1: don't synchronously update RSet during evacuation pauses
iveresov
parents:
595
diff
changeset
|
5467 assert(dirty_card_queue_set().completed_buffers_num() == 0, "Should be empty"); |
|
5986
500023bd0818
7143511: G1: Another instance of high GC Worker Other time (50ms)
johnc
parents:
5963
diff
changeset
|
5468 double start_par_time_sec = os::elapsedTime(); |
|
500023bd0818
7143511: G1: Another instance of high GC Worker Other time (50ms)
johnc
parents:
5963
diff
changeset
|
5469 double end_par_time_sec; |
|
500023bd0818
7143511: G1: Another instance of high GC Worker Other time (50ms)
johnc
parents:
5963
diff
changeset
|
5470 |
|
500023bd0818
7143511: G1: Another instance of high GC Worker Other time (50ms)
johnc
parents:
5963
diff
changeset
|
5471 { |
|
989
148e5441d916
6863023: need non-perm oops in code cache for JSR 292
jrose
parents:
890
diff
changeset
|
5472 StrongRootsScope srs(this); |
|
5986
500023bd0818
7143511: G1: Another instance of high GC Worker Other time (50ms)
johnc
parents:
5963
diff
changeset
|
5473 |
|
500023bd0818
7143511: G1: Another instance of high GC Worker Other time (50ms)
johnc
parents:
5963
diff
changeset
|
5474 if (G1CollectedHeap::use_parallel_gc_threads()) { |
|
500023bd0818
7143511: G1: Another instance of high GC Worker Other time (50ms)
johnc
parents:
5963
diff
changeset
|
5475 // The individual threads will set their evac-failure closures. |
|
500023bd0818
7143511: G1: Another instance of high GC Worker Other time (50ms)
johnc
parents:
5963
diff
changeset
|
5476 if (ParallelGCVerbose) G1ParScanThreadState::print_termination_stats_hdr(); |
|
500023bd0818
7143511: G1: Another instance of high GC Worker Other time (50ms)
johnc
parents:
5963
diff
changeset
|
5477 // These tasks use ShareHeap::_process_strong_tasks |
|
500023bd0818
7143511: G1: Another instance of high GC Worker Other time (50ms)
johnc
parents:
5963
diff
changeset
|
5478 assert(UseDynamicNumberOfGCThreads || |
|
500023bd0818
7143511: G1: Another instance of high GC Worker Other time (50ms)
johnc
parents:
5963
diff
changeset
|
5479 workers()->active_workers() == workers()->total_workers(), |
|
500023bd0818
7143511: G1: Another instance of high GC Worker Other time (50ms)
johnc
parents:
5963
diff
changeset
|
5480 "If not dynamic should be using all the workers"); |
|
500023bd0818
7143511: G1: Another instance of high GC Worker Other time (50ms)
johnc
parents:
5963
diff
changeset
|
5481 workers()->run_task(&g1_par_task); |
|
500023bd0818
7143511: G1: Another instance of high GC Worker Other time (50ms)
johnc
parents:
5963
diff
changeset
|
5482 } else { |
|
500023bd0818
7143511: G1: Another instance of high GC Worker Other time (50ms)
johnc
parents:
5963
diff
changeset
|
5483 g1_par_task.set_for_termination(n_workers); |
|
500023bd0818
7143511: G1: Another instance of high GC Worker Other time (50ms)
johnc
parents:
5963
diff
changeset
|
5484 g1_par_task.work(0); |
|
500023bd0818
7143511: G1: Another instance of high GC Worker Other time (50ms)
johnc
parents:
5963
diff
changeset
|
5485 } |
|
500023bd0818
7143511: G1: Another instance of high GC Worker Other time (50ms)
johnc
parents:
5963
diff
changeset
|
5486 end_par_time_sec = os::elapsedTime(); |
|
500023bd0818
7143511: G1: Another instance of high GC Worker Other time (50ms)
johnc
parents:
5963
diff
changeset
|
5487 |
|
500023bd0818
7143511: G1: Another instance of high GC Worker Other time (50ms)
johnc
parents:
5963
diff
changeset
|
5488 // Closing the inner scope will execute the destructor |
|
500023bd0818
7143511: G1: Another instance of high GC Worker Other time (50ms)
johnc
parents:
5963
diff
changeset
|
5489 // for the StrongRootsScope object. We record the current |
|
500023bd0818
7143511: G1: Another instance of high GC Worker Other time (50ms)
johnc
parents:
5963
diff
changeset
|
5490 // elapsed time before closing the scope so that time |
|
500023bd0818
7143511: G1: Another instance of high GC Worker Other time (50ms)
johnc
parents:
5963
diff
changeset
|
5491 // taken for the SRS destructor is NOT included in the |
|
500023bd0818
7143511: G1: Another instance of high GC Worker Other time (50ms)
johnc
parents:
5963
diff
changeset
|
5492 // reported parallel time. |
|
500023bd0818
7143511: G1: Another instance of high GC Worker Other time (50ms)
johnc
parents:
5963
diff
changeset
|
5493 } |
|
500023bd0818
7143511: G1: Another instance of high GC Worker Other time (50ms)
johnc
parents:
5963
diff
changeset
|
5494 |
|
500023bd0818
7143511: G1: Another instance of high GC Worker Other time (50ms)
johnc
parents:
5963
diff
changeset
|
5495 double par_time_ms = (end_par_time_sec - start_par_time_sec) * 1000.0; |
|
500023bd0818
7143511: G1: Another instance of high GC Worker Other time (50ms)
johnc
parents:
5963
diff
changeset
|
5496 g1_policy()->record_par_time(par_time_ms); |
|
500023bd0818
7143511: G1: Another instance of high GC Worker Other time (50ms)
johnc
parents:
5963
diff
changeset
|
5497 |
|
500023bd0818
7143511: G1: Another instance of high GC Worker Other time (50ms)
johnc
parents:
5963
diff
changeset
|
5498 double code_root_fixup_time_ms = |
|
500023bd0818
7143511: G1: Another instance of high GC Worker Other time (50ms)
johnc
parents:
5963
diff
changeset
|
5499 (os::elapsedTime() - end_par_time_sec) * 1000.0; |
|
500023bd0818
7143511: G1: Another instance of high GC Worker Other time (50ms)
johnc
parents:
5963
diff
changeset
|
5500 g1_policy()->record_code_root_fixup_time(code_root_fixup_time_ms); |
|
4095
bca17e38de00
6593758: RFE: Enhance GC ergonomics to dynamically choose ParallelGCThreads
jmasa
parents:
4090
diff
changeset
|
5501 |
| 342 | 5502 set_par_threads(0); |
|
1974
fd1d227ef1b9
6983204: G1: Nightly test nsk/regression/b4958615 failing with +ExplicitGCInvokesConcurrent
johnc
parents:
1973
diff
changeset
|
5503 |
|
3979
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5504 // Process any discovered reference objects - we have |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5505 // to do this _before_ we retire the GC alloc regions |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5506 // as we may have to copy some 'reachable' referent |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5507 // objects (and their reachable sub-graphs) that were |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5508 // not copied during the pause. |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5509 process_discovered_references(); |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5510 |
|
1974
fd1d227ef1b9
6983204: G1: Nightly test nsk/regression/b4958615 failing with +ExplicitGCInvokesConcurrent
johnc
parents:
1973
diff
changeset
|
5511 // Weak root processing. |
|
fd1d227ef1b9
6983204: G1: Nightly test nsk/regression/b4958615 failing with +ExplicitGCInvokesConcurrent
johnc
parents:
1973
diff
changeset
|
5512 // 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
|
5513 // 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
|
5514 // here too. |
| 342 | 5515 { |
|
3979
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5516 G1STWIsAliveClosure is_alive(this); |
| 342 | 5517 G1KeepAliveClosure keep_alive(this); |
| 5518 JNIHandles::weak_oops_do(&is_alive, &keep_alive); | |
| 5519 } | |
|
3979
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5520 |
|
3830
f44782f04dd4
7039627: G1: avoid BOT updates for survivor allocations and dirty survivor regions incrementally
tonyp
parents:
3824
diff
changeset
|
5521 release_gc_alloc_regions(); |
| 342 | 5522 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
|
5523 |
| 889 | 5524 concurrent_g1_refine()->clear_hot_cache(); |
| 342 | 5525 concurrent_g1_refine()->set_use_cache(true); |
| 5526 | |
| 5527 finalize_for_evac_failure(); | |
| 5528 | |
| 5529 if (evacuation_failed()) { | |
| 5530 remove_self_forwarding_pointers(); | |
|
6007
5c86f8211d1e
7160728: Introduce an extra logging level for G1 logging
brutisso
parents:
5987
diff
changeset
|
5531 if (G1Log::finer()) { |
| 6059 | 5532 gclog_or_tty->print(" (to-space exhausted)"); |
|
6007
5c86f8211d1e
7160728: Introduce an extra logging level for G1 logging
brutisso
parents:
5987
diff
changeset
|
5533 } else if (G1Log::fine()) { |
| 342 | 5534 gclog_or_tty->print("--"); |
| 5535 } | |
| 5536 } | |
| 5537 | |
|
3979
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5538 // Enqueue any remaining references remaining on the STW |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5539 // reference processor's discovered lists. We need to do |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5540 // this after the card table is cleaned (and verified) as |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5541 // the act of enqueuing entries on to the pending list |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5542 // will log these updates (and dirty their associated |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5543 // cards). We need these updates logged to update any |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5544 // RSets. |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5545 enqueue_discovered_references(); |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5546 |
|
616
4f360ec815ba
6720309: G1: don't synchronously update RSet during evacuation pauses
iveresov
parents:
595
diff
changeset
|
5547 if (G1DeferredRSUpdate) { |
|
4f360ec815ba
6720309: G1: don't synchronously update RSet during evacuation pauses
iveresov
parents:
595
diff
changeset
|
5548 RedirtyLoggedCardTableEntryFastClosure redirty; |
|
4f360ec815ba
6720309: G1: don't synchronously update RSet during evacuation pauses
iveresov
parents:
595
diff
changeset
|
5549 dirty_card_queue_set().set_closure(&redirty); |
|
4f360ec815ba
6720309: G1: don't synchronously update RSet during evacuation pauses
iveresov
parents:
595
diff
changeset
|
5550 dirty_card_queue_set().apply_closure_to_all_completed_buffers(); |
| 1111 | 5551 |
| 5552 DirtyCardQueueSet& dcq = JavaThread::dirty_card_queue_set(); | |
| 5553 dcq.merge_bufferlists(&dirty_card_queue_set()); | |
|
616
4f360ec815ba
6720309: G1: don't synchronously update RSet during evacuation pauses
iveresov
parents:
595
diff
changeset
|
5554 assert(dirty_card_queue_set().completed_buffers_num() == 0, "All should be consumed"); |
|
4f360ec815ba
6720309: G1: don't synchronously update RSet during evacuation pauses
iveresov
parents:
595
diff
changeset
|
5555 } |
| 342 | 5556 COMPILER2_PRESENT(DerivedPointerTable::update_pointers()); |
| 5557 } | |
| 5558 | |
| 2173 | 5559 void G1CollectedHeap::free_region_if_empty(HeapRegion* hr, |
| 2152 | 5560 size_t* pre_used, |
| 5561 FreeRegionList* free_list, | |
| 4072 | 5562 OldRegionSet* old_proxy_set, |
| 2152 | 5563 HumongousRegionSet* humongous_proxy_set, |
| 2173 | 5564 HRRSCleanupTask* hrrs_cleanup_task, |
| 2152 | 5565 bool par) { |
| 5566 if (hr->used() > 0 && hr->max_live_bytes() == 0 && !hr->is_young()) { | |
| 5567 if (hr->isHumongous()) { | |
| 5568 assert(hr->startsHumongous(), "we should only see starts humongous"); | |
| 5569 free_humongous_region(hr, pre_used, free_list, humongous_proxy_set, par); | |
| 5570 } else { | |
| 4072 | 5571 _old_set.remove_with_proxy(hr, old_proxy_set); |
| 2152 | 5572 free_region(hr, pre_used, free_list, par); |
| 342 | 5573 } |
| 2173 | 5574 } else { |
| 5575 hr->rem_set()->do_cleanup_work(hrrs_cleanup_task); | |
| 342 | 5576 } |
| 5577 } | |
| 5578 | |
| 2152 | 5579 void G1CollectedHeap::free_region(HeapRegion* hr, |
| 5580 size_t* pre_used, | |
| 5581 FreeRegionList* free_list, | |
| 5582 bool par) { | |
| 5583 assert(!hr->isHumongous(), "this is only for non-humongous regions"); | |
| 5584 assert(!hr->is_empty(), "the region should not be empty"); | |
| 5585 assert(free_list != NULL, "pre-condition"); | |
| 5586 | |
| 5587 *pre_used += hr->used(); | |
| 5588 hr->hr_clear(par, true /* clear_space */); | |
|
2432
455328d90876
7029458: G1: Add newly-reclaimed regions to the beginning of the region free list, not the end
tonyp
parents:
2369
diff
changeset
|
5589 free_list->add_as_head(hr); |
| 2152 | 5590 } |
| 5591 | |
| 5592 void G1CollectedHeap::free_humongous_region(HeapRegion* hr, | |
| 5593 size_t* pre_used, | |
| 5594 FreeRegionList* free_list, | |
| 5595 HumongousRegionSet* humongous_proxy_set, | |
| 5596 bool par) { | |
| 5597 assert(hr->startsHumongous(), "this is only for starts humongous regions"); | |
| 5598 assert(free_list != NULL, "pre-condition"); | |
| 5599 assert(humongous_proxy_set != NULL, "pre-condition"); | |
| 5600 | |
| 5601 size_t hr_used = hr->used(); | |
| 5602 size_t hr_capacity = hr->capacity(); | |
| 5603 size_t hr_pre_used = 0; | |
| 5604 _humongous_set.remove_with_proxy(hr, humongous_proxy_set); | |
| 5605 hr->set_notHumongous(); | |
| 5606 free_region(hr, &hr_pre_used, free_list, par); | |
| 5607 | |
|
6010
720b6a76dd9d
7157073: G1: type change size_t -> uint for region counts / indexes
tonyp
parents:
6008
diff
changeset
|
5608 uint i = hr->hrs_index() + 1; |
|
720b6a76dd9d
7157073: G1: type change size_t -> uint for region counts / indexes
tonyp
parents:
6008
diff
changeset
|
5609 uint num = 1; |
| 3766 | 5610 while (i < n_regions()) { |
| 5611 HeapRegion* curr_hr = region_at(i); | |
| 2152 | 5612 if (!curr_hr->continuesHumongous()) { |
| 5613 break; | |
| 5614 } | |
| 5615 curr_hr->set_notHumongous(); | |
| 5616 free_region(curr_hr, &hr_pre_used, free_list, par); | |
| 5617 num += 1; | |
| 5618 i += 1; | |
| 5619 } | |
| 5620 assert(hr_pre_used == hr_used, | |
| 5621 err_msg("hr_pre_used: "SIZE_FORMAT" and hr_used: "SIZE_FORMAT" " | |
| 5622 "should be the same", hr_pre_used, hr_used)); | |
| 5623 *pre_used += hr_pre_used; | |
| 5624 } | |
| 5625 | |
| 5626 void G1CollectedHeap::update_sets_after_freeing_regions(size_t pre_used, | |
| 5627 FreeRegionList* free_list, | |
| 4072 | 5628 OldRegionSet* old_proxy_set, |
| 2152 | 5629 HumongousRegionSet* humongous_proxy_set, |
| 5630 bool par) { | |
| 5631 if (pre_used > 0) { | |
| 5632 Mutex* lock = (par) ? ParGCRareEvent_lock : NULL; | |
| 342 | 5633 MutexLockerEx x(lock, Mutex::_no_safepoint_check_flag); |
| 2152 | 5634 assert(_summary_bytes_used >= pre_used, |
| 5635 err_msg("invariant: _summary_bytes_used: "SIZE_FORMAT" " | |
| 5636 "should be >= pre_used: "SIZE_FORMAT, | |
| 5637 _summary_bytes_used, pre_used)); | |
| 342 | 5638 _summary_bytes_used -= pre_used; |
| 2152 | 5639 } |
| 5640 if (free_list != NULL && !free_list->is_empty()) { | |
| 5641 MutexLockerEx x(FreeList_lock, Mutex::_no_safepoint_check_flag); | |
|
2432
455328d90876
7029458: G1: Add newly-reclaimed regions to the beginning of the region free list, not the end
tonyp
parents:
2369
diff
changeset
|
5642 _free_list.add_as_head(free_list); |
| 2152 | 5643 } |
| 4072 | 5644 if (old_proxy_set != NULL && !old_proxy_set->is_empty()) { |
| 5645 MutexLockerEx x(OldSets_lock, Mutex::_no_safepoint_check_flag); | |
| 5646 _old_set.update_from_proxy(old_proxy_set); | |
| 5647 } | |
| 2152 | 5648 if (humongous_proxy_set != NULL && !humongous_proxy_set->is_empty()) { |
| 5649 MutexLockerEx x(OldSets_lock, Mutex::_no_safepoint_check_flag); | |
| 5650 _humongous_set.update_from_proxy(humongous_proxy_set); | |
| 342 | 5651 } |
| 5652 } | |
| 5653 | |
|
796
29e7d79232b9
6819065: G1: eliminate high serial card table clearing time
apetrusenko
parents:
794
diff
changeset
|
5654 class G1ParCleanupCTTask : public AbstractGangTask { |
|
29e7d79232b9
6819065: G1: eliminate high serial card table clearing time
apetrusenko
parents:
794
diff
changeset
|
5655 CardTableModRefBS* _ct_bs; |
|
29e7d79232b9
6819065: G1: eliminate high serial card table clearing time
apetrusenko
parents:
794
diff
changeset
|
5656 G1CollectedHeap* _g1h; |
|
940
8624da129f0b
6841313: G1: dirty cards of survivor regions in parallel
apetrusenko
parents:
936
diff
changeset
|
5657 HeapRegion* volatile _su_head; |
|
796
29e7d79232b9
6819065: G1: eliminate high serial card table clearing time
apetrusenko
parents:
794
diff
changeset
|
5658 public: |
|
29e7d79232b9
6819065: G1: eliminate high serial card table clearing time
apetrusenko
parents:
794
diff
changeset
|
5659 G1ParCleanupCTTask(CardTableModRefBS* ct_bs, |
|
3830
f44782f04dd4
7039627: G1: avoid BOT updates for survivor allocations and dirty survivor regions incrementally
tonyp
parents:
3824
diff
changeset
|
5660 G1CollectedHeap* g1h) : |
|
796
29e7d79232b9
6819065: G1: eliminate high serial card table clearing time
apetrusenko
parents:
794
diff
changeset
|
5661 AbstractGangTask("G1 Par Cleanup CT Task"), |
|
3830
f44782f04dd4
7039627: G1: avoid BOT updates for survivor allocations and dirty survivor regions incrementally
tonyp
parents:
3824
diff
changeset
|
5662 _ct_bs(ct_bs), _g1h(g1h) { } |
|
796
29e7d79232b9
6819065: G1: eliminate high serial card table clearing time
apetrusenko
parents:
794
diff
changeset
|
5663 |
|
4728
441e946dc1af
7121618: Change type of number of GC workers to unsigned int.
jmasa
parents:
4711
diff
changeset
|
5664 void work(uint worker_id) { |
|
796
29e7d79232b9
6819065: G1: eliminate high serial card table clearing time
apetrusenko
parents:
794
diff
changeset
|
5665 HeapRegion* r; |
|
29e7d79232b9
6819065: G1: eliminate high serial card table clearing time
apetrusenko
parents:
794
diff
changeset
|
5666 while (r = _g1h->pop_dirty_cards_region()) { |
|
29e7d79232b9
6819065: G1: eliminate high serial card table clearing time
apetrusenko
parents:
794
diff
changeset
|
5667 clear_cards(r); |
|
29e7d79232b9
6819065: G1: eliminate high serial card table clearing time
apetrusenko
parents:
794
diff
changeset
|
5668 } |
|
940
8624da129f0b
6841313: G1: dirty cards of survivor regions in parallel
apetrusenko
parents:
936
diff
changeset
|
5669 } |
|
8624da129f0b
6841313: G1: dirty cards of survivor regions in parallel
apetrusenko
parents:
936
diff
changeset
|
5670 |
|
796
29e7d79232b9
6819065: G1: eliminate high serial card table clearing time
apetrusenko
parents:
794
diff
changeset
|
5671 void clear_cards(HeapRegion* r) { |
|
3830
f44782f04dd4
7039627: G1: avoid BOT updates for survivor allocations and dirty survivor regions incrementally
tonyp
parents:
3824
diff
changeset
|
5672 // Cards of the survivors should have already been dirtied. |
|
1394
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
5673 if (!r->is_survivor()) { |
|
796
29e7d79232b9
6819065: G1: eliminate high serial card table clearing time
apetrusenko
parents:
794
diff
changeset
|
5674 _ct_bs->clear(MemRegion(r->bottom(), r->end())); |
|
29e7d79232b9
6819065: G1: eliminate high serial card table clearing time
apetrusenko
parents:
794
diff
changeset
|
5675 } |
|
29e7d79232b9
6819065: G1: eliminate high serial card table clearing time
apetrusenko
parents:
794
diff
changeset
|
5676 } |
|
29e7d79232b9
6819065: G1: eliminate high serial card table clearing time
apetrusenko
parents:
794
diff
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|
5677 }; |
|
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6819065: G1: eliminate high serial card table clearing time
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|
5678 |
|
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|
5679 #ifndef PRODUCT |
|
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6841313: G1: dirty cards of survivor regions in parallel
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|
5680 class G1VerifyCardTableCleanup: public HeapRegionClosure { |
|
3317
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7035144: G1: nightly failure: Non-dirty cards in region that should be dirty (failures still exist...)
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|
5681 G1CollectedHeap* _g1h; |
|
940
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|
5682 CardTableModRefBS* _ct_bs; |
|
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|
5683 public: |
|
3317
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7035144: G1: nightly failure: Non-dirty cards in region that should be dirty (failures still exist...)
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|
5684 G1VerifyCardTableCleanup(G1CollectedHeap* g1h, CardTableModRefBS* ct_bs) |
|
063382f9b575
7035144: G1: nightly failure: Non-dirty cards in region that should be dirty (failures still exist...)
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|
5685 : _g1h(g1h), _ct_bs(ct_bs) { } |
|
2433
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|
5686 virtual bool doHeapRegion(HeapRegion* r) { |
|
1394
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|
5687 if (r->is_survivor()) { |
|
3317
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|
5688 _g1h->verify_dirty_region(r); |
|
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|
5689 } else { |
|
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|
5690 _g1h->verify_not_dirty_region(r); |
|
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|
5691 } |
|
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|
5692 return false; |
|
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|
5693 } |
|
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|
5694 }; |
|
2433
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|
5695 |
|
3317
063382f9b575
7035144: G1: nightly failure: Non-dirty cards in region that should be dirty (failures still exist...)
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|
5696 void G1CollectedHeap::verify_not_dirty_region(HeapRegion* hr) { |
|
063382f9b575
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|
5697 // All of the region should be clean. |
|
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|
5698 CardTableModRefBS* ct_bs = (CardTableModRefBS*)barrier_set(); |
|
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|
5699 MemRegion mr(hr->bottom(), hr->end()); |
|
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|
5700 ct_bs->verify_not_dirty_region(mr); |
|
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|
5701 } |
|
063382f9b575
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|
5702 |
|
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|
5703 void G1CollectedHeap::verify_dirty_region(HeapRegion* hr) { |
|
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|
5704 // We cannot guarantee that [bottom(),end()] is dirty. Threads |
|
063382f9b575
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|
5705 // dirty allocated blocks as they allocate them. The thread that |
|
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|
5706 // retires each region and replaces it with a new one will do a |
|
063382f9b575
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|
5707 // maximal allocation to fill in [pre_dummy_top(),end()] but will |
|
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|
5708 // not dirty that area (one less thing to have to do while holding |
|
063382f9b575
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|
5709 // a lock). So we can only verify that [bottom(),pre_dummy_top()] |
|
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|
5710 // is dirty. |
|
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|
5711 CardTableModRefBS* ct_bs = (CardTableModRefBS*) barrier_set(); |
|
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|
5712 MemRegion mr(hr->bottom(), hr->pre_dummy_top()); |
|
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|
5713 ct_bs->verify_dirty_region(mr); |
|
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|
5714 } |
|
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|
5715 |
|
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|
5716 void G1CollectedHeap::verify_dirty_young_list(HeapRegion* head) { |
|
3317
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|
5717 CardTableModRefBS* ct_bs = (CardTableModRefBS*) barrier_set(); |
|
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|
5718 for (HeapRegion* hr = head; hr != NULL; hr = hr->get_next_young_region()) { |
|
3317
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|
5719 verify_dirty_region(hr); |
|
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|
5720 } |
|
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|
5721 } |
|
abdfc822206f
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|
5722 |
|
abdfc822206f
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|
5723 void G1CollectedHeap::verify_dirty_young_regions() { |
|
abdfc822206f
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|
5724 verify_dirty_young_list(_young_list->first_region()); |
|
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|
5725 verify_dirty_young_list(_young_list->first_survivor_region()); |
|
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|
5726 } |
|
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|
5727 #endif |
|
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|
5728 |
| 342 | 5729 void G1CollectedHeap::cleanUpCardTable() { |
| 5730 CardTableModRefBS* ct_bs = (CardTableModRefBS*) (barrier_set()); | |
| 5731 double start = os::elapsedTime(); | |
| 5732 | |
| 4023 | 5733 { |
| 5734 // Iterate over the dirty cards region list. | |
| 5735 G1ParCleanupCTTask cleanup_task(ct_bs, this); | |
| 5736 | |
| 4711 | 5737 if (G1CollectedHeap::use_parallel_gc_threads()) { |
| 5738 set_par_threads(); | |
| 4023 | 5739 workers()->run_task(&cleanup_task); |
| 5740 set_par_threads(0); | |
| 5741 } else { | |
| 5742 while (_dirty_cards_region_list) { | |
| 5743 HeapRegion* r = _dirty_cards_region_list; | |
| 5744 cleanup_task.clear_cards(r); | |
| 5745 _dirty_cards_region_list = r->get_next_dirty_cards_region(); | |
| 5746 if (_dirty_cards_region_list == r) { | |
| 5747 // The last region. | |
| 5748 _dirty_cards_region_list = NULL; | |
| 5749 } | |
| 5750 r->set_next_dirty_cards_region(NULL); | |
|
796
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6819065: G1: eliminate high serial card table clearing time
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|
5751 } |
|
29e7d79232b9
6819065: G1: eliminate high serial card table clearing time
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diff
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|
5752 } |
| 4023 | 5753 #ifndef PRODUCT |
| 5754 if (G1VerifyCTCleanup || VerifyAfterGC) { | |
| 5755 G1VerifyCardTableCleanup cleanup_verifier(this, ct_bs); | |
| 5756 heap_region_iterate(&cleanup_verifier); | |
| 5757 } | |
| 5758 #endif | |
|
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|
5759 } |
|
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|
5760 |
| 342 | 5761 double elapsed = os::elapsedTime() - start; |
|
3979
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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3973
diff
changeset
|
5762 g1_policy()->record_clear_ct_time(elapsed * 1000.0); |
| 342 | 5763 } |
| 5764 | |
| 5765 void G1CollectedHeap::free_collection_set(HeapRegion* cs_head) { | |
| 2152 | 5766 size_t pre_used = 0; |
| 5767 FreeRegionList local_free_list("Local List for CSet Freeing"); | |
| 5768 | |
| 342 | 5769 double young_time_ms = 0.0; |
| 5770 double non_young_time_ms = 0.0; | |
| 5771 | |
|
1394
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|
5772 // Since the collection set is a superset of the the young list, |
|
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changeset
|
5773 // all we need to do to clear the young list is clear its |
|
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|
5774 // head and length, and unlink any young regions in the code below |
|
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|
5775 _young_list->clear(); |
|
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|
5776 |
| 342 | 5777 G1CollectorPolicy* policy = g1_policy(); |
| 5778 | |
| 5779 double start_sec = os::elapsedTime(); | |
| 5780 bool non_young = true; | |
| 5781 | |
| 5782 HeapRegion* cur = cs_head; | |
| 5783 int age_bound = -1; | |
| 5784 size_t rs_lengths = 0; | |
| 5785 | |
| 5786 while (cur != NULL) { | |
| 2361 | 5787 assert(!is_on_master_free_list(cur), "sanity"); |
| 342 | 5788 if (non_young) { |
| 5789 if (cur->is_young()) { | |
| 5790 double end_sec = os::elapsedTime(); | |
| 5791 double elapsed_ms = (end_sec - start_sec) * 1000.0; | |
| 5792 non_young_time_ms += elapsed_ms; | |
| 5793 | |
| 5794 start_sec = os::elapsedTime(); | |
| 5795 non_young = false; | |
| 5796 } | |
| 5797 } else { | |
|
4097
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7112743: G1: Reduce overhead of marking closure during evacuation pauses
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|
5798 if (!cur->is_young()) { |
|
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7112743: G1: Reduce overhead of marking closure during evacuation pauses
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|
5799 double end_sec = os::elapsedTime(); |
|
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7112743: G1: Reduce overhead of marking closure during evacuation pauses
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|
5800 double elapsed_ms = (end_sec - start_sec) * 1000.0; |
|
dc467e8b2c5e
7112743: G1: Reduce overhead of marking closure during evacuation pauses
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|
5801 young_time_ms += elapsed_ms; |
|
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7112743: G1: Reduce overhead of marking closure during evacuation pauses
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|
5802 |
|
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|
5803 start_sec = os::elapsedTime(); |
|
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|
5804 non_young = true; |
|
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|
5805 } |
| 342 | 5806 } |
| 5807 | |
| 5808 rs_lengths += cur->rem_set()->occupied(); | |
| 5809 | |
| 5810 HeapRegion* next = cur->next_in_collection_set(); | |
| 5811 assert(cur->in_collection_set(), "bad CS"); | |
| 5812 cur->set_next_in_collection_set(NULL); | |
| 5813 cur->set_in_collection_set(false); | |
| 5814 | |
| 5815 if (cur->is_young()) { | |
| 5816 int index = cur->young_index_in_cset(); | |
|
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|
5817 assert(index != -1, "invariant"); |
|
6010
720b6a76dd9d
7157073: G1: type change size_t -> uint for region counts / indexes
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6008
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changeset
|
5818 assert((uint) index < policy->young_cset_region_length(), "invariant"); |
| 342 | 5819 size_t words_survived = _surviving_young_words[index]; |
| 5820 cur->record_surv_words_in_group(words_survived); | |
|
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|
5821 |
|
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|
5822 // At this point the we have 'popped' cur from the collection set |
|
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|
5823 // (linked via next_in_collection_set()) but it is still in the |
|
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|
5824 // young list (linked via next_young_region()). Clear the |
|
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|
5825 // _next_young_region field. |
|
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|
5826 cur->set_next_young_region(NULL); |
| 342 | 5827 } else { |
| 5828 int index = cur->young_index_in_cset(); | |
|
4090
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|
5829 assert(index == -1, "invariant"); |
| 342 | 5830 } |
| 5831 | |
| 5832 assert( (cur->is_young() && cur->young_index_in_cset() > -1) || | |
| 5833 (!cur->is_young() && cur->young_index_in_cset() == -1), | |
| 5834 "invariant" ); | |
| 5835 | |
| 5836 if (!cur->evacuation_failed()) { | |
|
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|
5837 MemRegion used_mr = cur->used_region(); |
|
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|
5838 |
| 342 | 5839 // And the region is empty. |
|
4097
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changeset
|
5840 assert(!used_mr.is_empty(), "Should not have empty regions in a CS."); |
| 2152 | 5841 free_region(cur, &pre_used, &local_free_list, false /* par */); |
| 342 | 5842 } else { |
| 5843 cur->uninstall_surv_rate_group(); | |
|
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changeset
|
5844 if (cur->is_young()) { |
| 342 | 5845 cur->set_young_index_in_cset(-1); |
|
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|
5846 } |
| 342 | 5847 cur->set_not_young(); |
| 5848 cur->set_evacuation_failed(false); | |
| 4072 | 5849 // The region is now considered to be old. |
| 5850 _old_set.add(cur); | |
| 342 | 5851 } |
| 5852 cur = next; | |
| 5853 } | |
| 5854 | |
| 5855 policy->record_max_rs_lengths(rs_lengths); | |
| 5856 policy->cset_regions_freed(); | |
| 5857 | |
| 5858 double end_sec = os::elapsedTime(); | |
| 5859 double elapsed_ms = (end_sec - start_sec) * 1000.0; | |
|
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|
5860 |
|
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diff
changeset
|
5861 if (non_young) { |
| 342 | 5862 non_young_time_ms += elapsed_ms; |
|
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|
5863 } else { |
| 342 | 5864 young_time_ms += elapsed_ms; |
|
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diff
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|
5865 } |
| 342 | 5866 |
| 2152 | 5867 update_sets_after_freeing_regions(pre_used, &local_free_list, |
| 4072 | 5868 NULL /* old_proxy_set */, |
| 2152 | 5869 NULL /* humongous_proxy_set */, |
| 5870 false /* par */); | |
| 342 | 5871 policy->record_young_free_cset_time_ms(young_time_ms); |
| 5872 policy->record_non_young_free_cset_time_ms(non_young_time_ms); | |
| 5873 } | |
| 5874 | |
|
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|
5875 // This routine is similar to the above but does not record |
|
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6819061: G1: eliminate serial Other times that are proportional to the collection set length
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|
5876 // 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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|
5877 // the current incremental collection set in preparation of a |
|
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6819061: G1: eliminate serial Other times that are proportional to the collection set length
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|
5878 // full collection. After the full GC we will start to build up |
|
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6819061: G1: eliminate serial Other times that are proportional to the collection set length
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|
5879 // the incremental collection set again. |
|
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6819061: G1: eliminate serial Other times that are proportional to the collection set length
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|
5880 // This is only called when we're doing a full collection |
|
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6819061: G1: eliminate serial Other times that are proportional to the collection set length
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|
5881 // and is immediately followed by the tearing down of the young list. |
|
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|
5882 |
|
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6819061: G1: eliminate serial Other times that are proportional to the collection set length
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|
5883 void G1CollectedHeap::abandon_collection_set(HeapRegion* cs_head) { |
|
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6819061: G1: eliminate serial Other times that are proportional to the collection set length
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|
5884 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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|
5885 |
|
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6819061: G1: eliminate serial Other times that are proportional to the collection set length
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|
5886 while (cur != NULL) { |
|
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|
5887 HeapRegion* next = cur->next_in_collection_set(); |
|
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|
5888 assert(cur->in_collection_set(), "bad CS"); |
|
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|
5889 cur->set_next_in_collection_set(NULL); |
|
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|
5890 cur->set_in_collection_set(false); |
|
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|
5891 cur->set_young_index_in_cset(-1); |
|
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|
5892 cur = next; |
|
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|
5893 } |
|
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|
5894 } |
|
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|
5895 |
| 2152 | 5896 void G1CollectedHeap::set_free_regions_coming() { |
| 5897 if (G1ConcRegionFreeingVerbose) { | |
| 5898 gclog_or_tty->print_cr("G1ConcRegionFreeing [cm thread] : " | |
| 5899 "setting free regions coming"); | |
| 5900 } | |
| 5901 | |
| 5902 assert(!free_regions_coming(), "pre-condition"); | |
| 5903 _free_regions_coming = true; | |
| 342 | 5904 } |
| 5905 | |
| 2152 | 5906 void G1CollectedHeap::reset_free_regions_coming() { |
|
4837
eff609af17d7
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|
5907 assert(free_regions_coming(), "pre-condition"); |
|
eff609af17d7
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|
5908 |
| 2152 | 5909 { |
| 5910 MutexLockerEx x(SecondaryFreeList_lock, Mutex::_no_safepoint_check_flag); | |
| 5911 _free_regions_coming = false; | |
| 5912 SecondaryFreeList_lock->notify_all(); | |
| 5913 } | |
| 5914 | |
| 5915 if (G1ConcRegionFreeingVerbose) { | |
| 5916 gclog_or_tty->print_cr("G1ConcRegionFreeing [cm thread] : " | |
| 5917 "reset free regions coming"); | |
| 342 | 5918 } |
| 5919 } | |
| 5920 | |
| 2152 | 5921 void G1CollectedHeap::wait_while_free_regions_coming() { |
| 5922 // Most of the time we won't have to wait, so let's do a quick test | |
| 5923 // first before we take the lock. | |
| 5924 if (!free_regions_coming()) { | |
| 5925 return; | |
| 5926 } | |
| 5927 | |
| 5928 if (G1ConcRegionFreeingVerbose) { | |
| 5929 gclog_or_tty->print_cr("G1ConcRegionFreeing [other] : " | |
| 5930 "waiting for free regions"); | |
| 342 | 5931 } |
| 5932 | |
| 5933 { | |
| 2152 | 5934 MutexLockerEx x(SecondaryFreeList_lock, Mutex::_no_safepoint_check_flag); |
| 5935 while (free_regions_coming()) { | |
| 5936 SecondaryFreeList_lock->wait(Mutex::_no_safepoint_check_flag); | |
| 342 | 5937 } |
| 2152 | 5938 } |
| 5939 | |
| 5940 if (G1ConcRegionFreeingVerbose) { | |
| 5941 gclog_or_tty->print_cr("G1ConcRegionFreeing [other] : " | |
| 5942 "done waiting for free regions"); | |
| 5943 } | |
| 342 | 5944 } |
| 5945 | |
| 5946 void G1CollectedHeap::set_region_short_lived_locked(HeapRegion* hr) { | |
| 5947 assert(heap_lock_held_for_gc(), | |
| 5948 "the heap lock should already be held by or for this thread"); | |
| 5949 _young_list->push_region(hr); | |
| 5950 } | |
| 5951 | |
| 5952 class NoYoungRegionsClosure: public HeapRegionClosure { | |
| 5953 private: | |
| 5954 bool _success; | |
| 5955 public: | |
| 5956 NoYoungRegionsClosure() : _success(true) { } | |
| 5957 bool doHeapRegion(HeapRegion* r) { | |
| 5958 if (r->is_young()) { | |
| 5959 gclog_or_tty->print_cr("Region ["PTR_FORMAT", "PTR_FORMAT") tagged as young", | |
| 5960 r->bottom(), r->end()); | |
| 5961 _success = false; | |
| 5962 } | |
| 5963 return false; | |
| 5964 } | |
| 5965 bool success() { return _success; } | |
| 5966 }; | |
| 5967 | |
|
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|
5968 bool G1CollectedHeap::check_young_list_empty(bool check_heap, bool check_sample) { |
|
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|
5969 bool ret = _young_list->check_list_empty(check_sample); |
|
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|
5970 |
|
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|
5971 if (check_heap) { |
| 342 | 5972 NoYoungRegionsClosure closure; |
| 5973 heap_region_iterate(&closure); | |
| 5974 ret = ret && closure.success(); | |
| 5975 } | |
| 5976 | |
| 5977 return ret; | |
| 5978 } | |
| 5979 | |
| 4072 | 5980 class TearDownRegionSetsClosure : public HeapRegionClosure { |
| 5981 private: | |
| 5982 OldRegionSet *_old_set; | |
| 2152 | 5983 |
| 342 | 5984 public: |
| 4072 | 5985 TearDownRegionSetsClosure(OldRegionSet* old_set) : _old_set(old_set) { } |
| 2152 | 5986 |
| 342 | 5987 bool doHeapRegion(HeapRegion* r) { |
| 4072 | 5988 if (r->is_empty()) { |
| 5989 // We ignore empty regions, we'll empty the free list afterwards | |
| 5990 } else if (r->is_young()) { | |
| 5991 // We ignore young regions, we'll empty the young list afterwards | |
| 5992 } else if (r->isHumongous()) { | |
| 5993 // We ignore humongous regions, we're not tearing down the | |
| 5994 // humongous region set | |
| 342 | 5995 } else { |
| 4072 | 5996 // The rest should be old |
| 5997 _old_set->remove(r); | |
| 342 | 5998 } |
| 5999 return false; | |
| 6000 } | |
| 6001 | |
| 4072 | 6002 ~TearDownRegionSetsClosure() { |
| 6003 assert(_old_set->is_empty(), "post-condition"); | |
| 2152 | 6004 } |
| 342 | 6005 }; |
| 6006 | |
| 4072 | 6007 void G1CollectedHeap::tear_down_region_sets(bool free_list_only) { |
| 6008 assert_at_safepoint(true /* should_be_vm_thread */); | |
| 6009 | |
| 6010 if (!free_list_only) { | |
| 6011 TearDownRegionSetsClosure cl(&_old_set); | |
| 6012 heap_region_iterate(&cl); | |
| 6013 | |
| 6014 // Need to do this after the heap iteration to be able to | |
| 6015 // recognize the young regions and ignore them during the iteration. | |
| 6016 _young_list->empty_list(); | |
| 6017 } | |
| 6018 _free_list.remove_all(); | |
| 6019 } | |
| 6020 | |
| 6021 class RebuildRegionSetsClosure : public HeapRegionClosure { | |
| 6022 private: | |
| 6023 bool _free_list_only; | |
| 6024 OldRegionSet* _old_set; | |
| 6025 FreeRegionList* _free_list; | |
| 6026 size_t _total_used; | |
| 6027 | |
| 6028 public: | |
| 6029 RebuildRegionSetsClosure(bool free_list_only, | |
| 6030 OldRegionSet* old_set, FreeRegionList* free_list) : | |
| 6031 _free_list_only(free_list_only), | |
| 6032 _old_set(old_set), _free_list(free_list), _total_used(0) { | |
| 6033 assert(_free_list->is_empty(), "pre-condition"); | |
| 6034 if (!free_list_only) { | |
| 6035 assert(_old_set->is_empty(), "pre-condition"); | |
| 6036 } | |
| 6037 } | |
| 6038 | |
| 6039 bool doHeapRegion(HeapRegion* r) { | |
| 6040 if (r->continuesHumongous()) { | |
| 6041 return false; | |
| 6042 } | |
| 6043 | |
| 6044 if (r->is_empty()) { | |
| 6045 // Add free regions to the free list | |
| 6046 _free_list->add_as_tail(r); | |
| 6047 } else if (!_free_list_only) { | |
| 6048 assert(!r->is_young(), "we should not come across young regions"); | |
| 6049 | |
| 6050 if (r->isHumongous()) { | |
| 6051 // We ignore humongous regions, we left the humongous set unchanged | |
| 6052 } else { | |
| 6053 // The rest should be old, add them to the old set | |
| 6054 _old_set->add(r); | |
| 6055 } | |
| 6056 _total_used += r->used(); | |
| 6057 } | |
| 6058 | |
| 6059 return false; | |
| 6060 } | |
| 6061 | |
| 6062 size_t total_used() { | |
| 6063 return _total_used; | |
| 6064 } | |
| 6065 }; | |
| 6066 | |
| 6067 void G1CollectedHeap::rebuild_region_sets(bool free_list_only) { | |
| 6068 assert_at_safepoint(true /* should_be_vm_thread */); | |
| 6069 | |
| 6070 RebuildRegionSetsClosure cl(free_list_only, &_old_set, &_free_list); | |
| 6071 heap_region_iterate(&cl); | |
| 6072 | |
| 6073 if (!free_list_only) { | |
| 6074 _summary_bytes_used = cl.total_used(); | |
| 6075 } | |
| 6076 assert(_summary_bytes_used == recalculate_used(), | |
| 6077 err_msg("inconsistent _summary_bytes_used, " | |
| 6078 "value: "SIZE_FORMAT" recalculated: "SIZE_FORMAT, | |
| 6079 _summary_bytes_used, recalculate_used())); | |
| 342 | 6080 } |
| 6081 | |
| 6082 void G1CollectedHeap::set_refine_cte_cl_concurrency(bool concurrent) { | |
| 6083 _refine_cte_cl->set_concurrent(concurrent); | |
| 6084 } | |
| 6085 | |
| 6086 bool G1CollectedHeap::is_in_closed_subset(const void* p) const { | |
| 6087 HeapRegion* hr = heap_region_containing(p); | |
| 6088 if (hr == NULL) { | |
| 6089 return is_in_permanent(p); | |
| 6090 } else { | |
| 6091 return hr->is_in(p); | |
| 6092 } | |
| 6093 } | |
| 2152 | 6094 |
|
3830
f44782f04dd4
7039627: G1: avoid BOT updates for survivor allocations and dirty survivor regions incrementally
tonyp
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3824
diff
changeset
|
6095 // Methods for the mutator alloc region |
|
f44782f04dd4
7039627: G1: avoid BOT updates for survivor allocations and dirty survivor regions incrementally
tonyp
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3824
diff
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|
6096 |
|
2433
abdfc822206f
7023069: G1: Introduce symmetric locking in the slow allocation path
tonyp
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2432
diff
changeset
|
6097 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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diff
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|
6098 bool force) { |
|
abdfc822206f
7023069: G1: Introduce symmetric locking in the slow allocation path
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diff
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|
6099 assert_heap_locked_or_at_safepoint(true /* should_be_vm_thread */); |
|
abdfc822206f
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2432
diff
changeset
|
6100 assert(!force || g1_policy()->can_expand_young_list(), |
|
abdfc822206f
7023069: G1: Introduce symmetric locking in the slow allocation path
tonyp
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2432
diff
changeset
|
6101 "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
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3777
diff
changeset
|
6102 bool young_list_full = g1_policy()->is_young_list_full(); |
|
5f6f2615433a
7049999: G1: Make the G1PrintHeapRegions output consistent and complete
tonyp
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diff
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|
6103 if (force || !young_list_full) { |
|
2433
abdfc822206f
7023069: G1: Introduce symmetric locking in the slow allocation path
tonyp
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2432
diff
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|
6104 HeapRegion* new_alloc_region = new_region(word_size, |
|
abdfc822206f
7023069: G1: Introduce symmetric locking in the slow allocation path
tonyp
parents:
2432
diff
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|
6105 false /* do_expand */); |
|
abdfc822206f
7023069: G1: Introduce symmetric locking in the slow allocation path
tonyp
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diff
changeset
|
6106 if (new_alloc_region != NULL) { |
|
abdfc822206f
7023069: G1: Introduce symmetric locking in the slow allocation path
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2432
diff
changeset
|
6107 set_region_short_lived_locked(new_alloc_region); |
|
3778
5f6f2615433a
7049999: G1: Make the G1PrintHeapRegions output consistent and complete
tonyp
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3777
diff
changeset
|
6108 _hr_printer.alloc(new_alloc_region, G1HRPrinter::Eden, young_list_full); |
|
2433
abdfc822206f
7023069: G1: Introduce symmetric locking in the slow allocation path
tonyp
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2432
diff
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|
6109 return new_alloc_region; |
|
abdfc822206f
7023069: G1: Introduce symmetric locking in the slow allocation path
tonyp
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diff
changeset
|
6110 } |
|
abdfc822206f
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tonyp
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diff
changeset
|
6111 } |
|
abdfc822206f
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diff
changeset
|
6112 return NULL; |
|
abdfc822206f
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tonyp
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2432
diff
changeset
|
6113 } |
|
abdfc822206f
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|
6114 |
|
abdfc822206f
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diff
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|
6115 void G1CollectedHeap::retire_mutator_alloc_region(HeapRegion* alloc_region, |
|
abdfc822206f
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|
6116 size_t allocated_bytes) { |
|
abdfc822206f
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diff
changeset
|
6117 assert_heap_locked_or_at_safepoint(true /* should_be_vm_thread */); |
|
abdfc822206f
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diff
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|
6118 assert(alloc_region->is_young(), "all mutator alloc regions should be young"); |
|
abdfc822206f
7023069: G1: Introduce symmetric locking in the slow allocation path
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2432
diff
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|
6119 |
|
abdfc822206f
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diff
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|
6120 g1_policy()->add_region_to_incremental_cset_lhs(alloc_region); |
|
abdfc822206f
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|
6121 _summary_bytes_used += allocated_bytes; |
|
3778
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3777
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|
6122 _hr_printer.retire(alloc_region); |
|
3980
8229bd737950
7075646: G1: fix inconsistencies in the monitoring data
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3979
diff
changeset
|
6123 // We update the eden sizes here, when the region is retired, |
|
8229bd737950
7075646: G1: fix inconsistencies in the monitoring data
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3979
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|
6124 // instead of when it's allocated, since this is the point that its |
|
8229bd737950
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|
6125 // used space has been recored in _summary_bytes_used. |
|
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changeset
|
6126 g1mm()->update_eden_size(); |
|
2433
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|
6127 } |
|
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|
6128 |
|
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|
6129 HeapRegion* MutatorAllocRegion::allocate_new_region(size_t word_size, |
|
abdfc822206f
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|
6130 bool force) { |
|
abdfc822206f
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|
6131 return _g1h->new_mutator_alloc_region(word_size, force); |
|
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|
6132 } |
|
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|
6133 |
|
4095
bca17e38de00
6593758: RFE: Enhance GC ergonomics to dynamically choose ParallelGCThreads
jmasa
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4090
diff
changeset
|
6134 void G1CollectedHeap::set_par_threads() { |
|
bca17e38de00
6593758: RFE: Enhance GC ergonomics to dynamically choose ParallelGCThreads
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4090
diff
changeset
|
6135 // Don't change the number of workers. Use the value previously set |
|
bca17e38de00
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4090
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|
6136 // in the workgroup. |
| 4711 | 6137 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
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4711
diff
changeset
|
6138 uint n_workers = workers()->active_workers(); |
| 4711 | 6139 assert(UseDynamicNumberOfGCThreads || |
|
4095
bca17e38de00
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4090
diff
changeset
|
6140 n_workers == workers()->total_workers(), |
|
bca17e38de00
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4090
diff
changeset
|
6141 "Otherwise should be using the total number of workers"); |
|
bca17e38de00
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6142 if (n_workers == 0) { |
|
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6143 assert(false, "Should have been set in prior evacuation pause."); |
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6144 n_workers = ParallelGCThreads; |
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6145 workers()->set_active_workers(n_workers); |
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6146 } |
|
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6147 set_par_threads(n_workers); |
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6148 } |
|
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6149 |
|
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6150 void MutatorAllocRegion::retire_region(HeapRegion* alloc_region, |
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6151 size_t allocated_bytes) { |
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6152 _g1h->retire_mutator_alloc_region(alloc_region, allocated_bytes); |
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6153 } |
|
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6154 |
|
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6155 // Methods for the GC alloc regions |
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6156 |
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6157 HeapRegion* G1CollectedHeap::new_gc_alloc_region(size_t word_size, |
|
6010
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6158 uint count, |
|
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6159 GCAllocPurpose ap) { |
|
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6160 assert(FreeList_lock->owned_by_self(), "pre-condition"); |
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6161 |
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6162 if (count < g1_policy()->max_regions(ap)) { |
|
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6163 HeapRegion* new_alloc_region = new_region(word_size, |
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6164 true /* do_expand */); |
|
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6165 if (new_alloc_region != NULL) { |
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6166 // We really only need to do this for old regions given that we |
|
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6167 // should never scan survivors. But it doesn't hurt to do it |
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6168 // for survivors too. |
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6169 new_alloc_region->set_saved_mark(); |
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6170 if (ap == GCAllocForSurvived) { |
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6171 new_alloc_region->set_survivor(); |
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6172 _hr_printer.alloc(new_alloc_region, G1HRPrinter::Survivor); |
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6173 } else { |
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6174 _hr_printer.alloc(new_alloc_region, G1HRPrinter::Old); |
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6175 } |
|
4787
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6176 bool during_im = g1_policy()->during_initial_mark_pause(); |
|
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6177 new_alloc_region->note_start_of_copying(during_im); |
|
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6178 return new_alloc_region; |
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6179 } else { |
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6180 g1_policy()->note_alloc_region_limit_reached(ap); |
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6181 } |
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|
6182 } |
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|
6183 return NULL; |
|
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|
6184 } |
|
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6185 |
|
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|
6186 void G1CollectedHeap::retire_gc_alloc_region(HeapRegion* alloc_region, |
|
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6187 size_t allocated_bytes, |
|
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|
6188 GCAllocPurpose ap) { |
|
4787
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6189 bool during_im = g1_policy()->during_initial_mark_pause(); |
|
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6190 alloc_region->note_end_of_copying(during_im); |
|
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|
6191 g1_policy()->record_bytes_copied_during_gc(allocated_bytes); |
|
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|
6192 if (ap == GCAllocForSurvived) { |
|
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|
6193 young_list()->add_survivor_region(alloc_region); |
| 4072 | 6194 } else { |
| 6195 _old_set.add(alloc_region); | |
|
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|
6196 } |
|
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|
6197 _hr_printer.retire(alloc_region); |
|
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|
6198 } |
|
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|
6199 |
|
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|
6200 HeapRegion* SurvivorGCAllocRegion::allocate_new_region(size_t word_size, |
|
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|
6201 bool force) { |
|
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|
6202 assert(!force, "not supported for GC alloc regions"); |
|
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|
6203 return _g1h->new_gc_alloc_region(word_size, count(), GCAllocForSurvived); |
|
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|
6204 } |
|
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|
6205 |
|
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|
6206 void SurvivorGCAllocRegion::retire_region(HeapRegion* alloc_region, |
|
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|
6207 size_t allocated_bytes) { |
|
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|
6208 _g1h->retire_gc_alloc_region(alloc_region, allocated_bytes, |
|
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|
6209 GCAllocForSurvived); |
|
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|
6210 } |
|
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|
6211 |
|
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|
6212 HeapRegion* OldGCAllocRegion::allocate_new_region(size_t word_size, |
|
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|
6213 bool force) { |
|
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|
6214 assert(!force, "not supported for GC alloc regions"); |
|
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|
6215 return _g1h->new_gc_alloc_region(word_size, count(), GCAllocForTenured); |
|
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|
6216 } |
|
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|
6217 |
|
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|
6218 void OldGCAllocRegion::retire_region(HeapRegion* alloc_region, |
|
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|
6219 size_t allocated_bytes) { |
|
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|
6220 _g1h->retire_gc_alloc_region(alloc_region, allocated_bytes, |
|
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|
6221 GCAllocForTenured); |
|
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|
6222 } |
|
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|
6223 // Heap region set verification |
|
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|
6224 |
| 2152 | 6225 class VerifyRegionListsClosure : public HeapRegionClosure { |
| 6226 private: | |
| 4072 | 6227 FreeRegionList* _free_list; |
| 6228 OldRegionSet* _old_set; | |
| 2152 | 6229 HumongousRegionSet* _humongous_set; |
|
6010
720b6a76dd9d
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6008
diff
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|
6230 uint _region_count; |
| 2152 | 6231 |
| 6232 public: | |
| 4072 | 6233 VerifyRegionListsClosure(OldRegionSet* old_set, |
| 6234 HumongousRegionSet* humongous_set, | |
| 2152 | 6235 FreeRegionList* free_list) : |
| 4072 | 6236 _old_set(old_set), _humongous_set(humongous_set), |
| 6237 _free_list(free_list), _region_count(0) { } | |
| 2152 | 6238 |
|
6010
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|
6239 uint region_count() { return _region_count; } |
| 2152 | 6240 |
| 6241 bool doHeapRegion(HeapRegion* hr) { | |
| 6242 _region_count += 1; | |
| 6243 | |
| 6244 if (hr->continuesHumongous()) { | |
| 6245 return false; | |
| 6246 } | |
| 6247 | |
| 6248 if (hr->is_young()) { | |
| 6249 // TODO | |
| 6250 } else if (hr->startsHumongous()) { | |
| 6251 _humongous_set->verify_next_region(hr); | |
| 6252 } else if (hr->is_empty()) { | |
| 6253 _free_list->verify_next_region(hr); | |
| 4072 | 6254 } else { |
| 6255 _old_set->verify_next_region(hr); | |
| 2152 | 6256 } |
| 6257 return false; | |
| 6258 } | |
| 6259 }; | |
| 6260 | |
|
6010
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|
6261 HeapRegion* G1CollectedHeap::new_heap_region(uint hrs_index, |
| 3766 | 6262 HeapWord* bottom) { |
| 6263 HeapWord* end = bottom + HeapRegion::GrainWords; | |
| 6264 MemRegion mr(bottom, end); | |
| 6265 assert(_g1_reserved.contains(mr), "invariant"); | |
| 6266 // This might return NULL if the allocation fails | |
| 6267 return new HeapRegion(hrs_index, _bot_shared, mr, true /* is_zeroed */); | |
| 6268 } | |
| 6269 | |
| 2152 | 6270 void G1CollectedHeap::verify_region_sets() { |
| 6271 assert_heap_locked_or_at_safepoint(true /* should_be_vm_thread */); | |
| 6272 | |
| 6273 // First, check the explicit lists. | |
| 6274 _free_list.verify(); | |
| 6275 { | |
| 6276 // Given that a concurrent operation might be adding regions to | |
| 6277 // the secondary free list we have to take the lock before | |
| 6278 // verifying it. | |
| 6279 MutexLockerEx x(SecondaryFreeList_lock, Mutex::_no_safepoint_check_flag); | |
| 6280 _secondary_free_list.verify(); | |
| 6281 } | |
| 4072 | 6282 _old_set.verify(); |
| 2152 | 6283 _humongous_set.verify(); |
| 6284 | |
| 6285 // If a concurrent region freeing operation is in progress it will | |
| 6286 // be difficult to correctly attributed any free regions we come | |
| 6287 // across to the correct free list given that they might belong to | |
| 6288 // one of several (free_list, secondary_free_list, any local lists, | |
| 6289 // etc.). So, if that's the case we will skip the rest of the | |
| 6290 // verification operation. Alternatively, waiting for the concurrent | |
| 6291 // operation to complete will have a non-trivial effect on the GC's | |
| 6292 // operation (no concurrent operation will last longer than the | |
| 6293 // interval between two calls to verification) and it might hide | |
| 6294 // any issues that we would like to catch during testing. | |
| 6295 if (free_regions_coming()) { | |
| 6296 return; | |
| 6297 } | |
| 6298 | |
| 2361 | 6299 // Make sure we append the secondary_free_list on the free_list so |
| 6300 // that all free regions we will come across can be safely | |
| 6301 // attributed to the free_list. | |
| 6302 append_secondary_free_list_if_not_empty_with_lock(); | |
| 2152 | 6303 |
| 6304 // Finally, make sure that the region accounting in the lists is | |
| 6305 // consistent with what we see in the heap. | |
| 4072 | 6306 _old_set.verify_start(); |
| 2152 | 6307 _humongous_set.verify_start(); |
| 6308 _free_list.verify_start(); | |
| 6309 | |
| 4072 | 6310 VerifyRegionListsClosure cl(&_old_set, &_humongous_set, &_free_list); |
| 2152 | 6311 heap_region_iterate(&cl); |
| 6312 | |
| 4072 | 6313 _old_set.verify_end(); |
| 2152 | 6314 _humongous_set.verify_end(); |
| 6315 _free_list.verify_end(); | |
| 342 | 6316 } |