Mercurial > hg > truffle
annotate src/share/vm/gc_implementation/g1/g1CollectedHeap.cpp @ 6219:922993931b3d
7178361: G1: Make sure that PrintGC and PrintGCDetails use the same timing for the GC pause
Summary: Also reviewed by: vitalyd@gmail.com. Move the timing out of G1CollectorPolicy into the G1GCPhaseTimes class
Reviewed-by: johnc
| author | brutisso |
|---|---|
| date | Wed, 11 Jul 2012 22:47:38 +0200 |
| parents | 7994a5a35fcf |
| children | 3a431b605145 |
| 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/g1GCPhaseTimes.hpp" |
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37 #include "gc_implementation/g1/g1Log.hpp" |
| 1972 | 38 #include "gc_implementation/g1/g1MarkSweep.hpp" |
| 39 #include "gc_implementation/g1/g1OopClosures.inline.hpp" | |
| 40 #include "gc_implementation/g1/g1RemSet.inline.hpp" | |
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41 #include "gc_implementation/g1/heapRegion.inline.hpp" |
| 1972 | 42 #include "gc_implementation/g1/heapRegionRemSet.hpp" |
| 43 #include "gc_implementation/g1/heapRegionSeq.inline.hpp" | |
| 44 #include "gc_implementation/g1/vm_operations_g1.hpp" | |
| 45 #include "gc_implementation/shared/isGCActiveMark.hpp" | |
| 46 #include "memory/gcLocker.inline.hpp" | |
| 47 #include "memory/genOopClosures.inline.hpp" | |
| 48 #include "memory/generationSpec.hpp" | |
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49 #include "memory/referenceProcessor.hpp" |
| 1972 | 50 #include "oops/oop.inline.hpp" |
| 51 #include "oops/oop.pcgc.inline.hpp" | |
| 52 #include "runtime/aprofiler.hpp" | |
| 53 #include "runtime/vmThread.hpp" | |
| 342 | 54 |
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55 size_t G1CollectedHeap::_humongous_object_threshold_in_words = 0; |
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56 |
| 342 | 57 // turn it on so that the contents of the young list (scan-only / |
| 58 // to-be-collected) are printed at "strategic" points before / during | |
| 59 // / after the collection --- this is useful for debugging | |
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60 #define YOUNG_LIST_VERBOSE 0 |
| 342 | 61 // CURRENT STATUS |
| 62 // This file is under construction. Search for "FIXME". | |
| 63 | |
| 64 // INVARIANTS/NOTES | |
| 65 // | |
| 66 // All allocation activity covered by the G1CollectedHeap interface is | |
| 1973 | 67 // serialized by acquiring the HeapLock. This happens in mem_allocate |
| 68 // and allocate_new_tlab, which are the "entry" points to the | |
| 69 // allocation code from the rest of the JVM. (Note that this does not | |
| 70 // apply to TLAB allocation, which is not part of this interface: it | |
| 71 // is done by clients of this interface.) | |
| 342 | 72 |
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73 // Notes on implementation of parallelism in different tasks. |
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74 // |
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75 // G1ParVerifyTask uses heap_region_par_iterate_chunked() for parallelism. |
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76 // The number of GC workers is passed to heap_region_par_iterate_chunked(). |
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77 // It does use run_task() which sets _n_workers in the task. |
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78 // G1ParTask executes g1_process_strong_roots() -> |
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79 // SharedHeap::process_strong_roots() which calls eventuall to |
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80 // CardTableModRefBS::par_non_clean_card_iterate_work() which uses |
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81 // SequentialSubTasksDone. SharedHeap::process_strong_roots() also |
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82 // directly uses SubTasksDone (_process_strong_tasks field in SharedHeap). |
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83 // |
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84 |
| 342 | 85 // Local to this file. |
| 86 | |
| 87 class RefineCardTableEntryClosure: public CardTableEntryClosure { | |
| 88 SuspendibleThreadSet* _sts; | |
| 89 G1RemSet* _g1rs; | |
| 90 ConcurrentG1Refine* _cg1r; | |
| 91 bool _concurrent; | |
| 92 public: | |
| 93 RefineCardTableEntryClosure(SuspendibleThreadSet* sts, | |
| 94 G1RemSet* g1rs, | |
| 95 ConcurrentG1Refine* cg1r) : | |
| 96 _sts(sts), _g1rs(g1rs), _cg1r(cg1r), _concurrent(true) | |
| 97 {} | |
| 98 bool do_card_ptr(jbyte* card_ptr, int worker_i) { | |
| 1705 | 99 bool oops_into_cset = _g1rs->concurrentRefineOneCard(card_ptr, worker_i, false); |
| 100 // This path is executed by the concurrent refine or mutator threads, | |
| 101 // concurrently, and so we do not care if card_ptr contains references | |
| 102 // that point into the collection set. | |
| 103 assert(!oops_into_cset, "should be"); | |
| 104 | |
| 342 | 105 if (_concurrent && _sts->should_yield()) { |
| 106 // Caller will actually yield. | |
| 107 return false; | |
| 108 } | |
| 109 // Otherwise, we finished successfully; return true. | |
| 110 return true; | |
| 111 } | |
| 112 void set_concurrent(bool b) { _concurrent = b; } | |
| 113 }; | |
| 114 | |
| 115 | |
| 116 class ClearLoggedCardTableEntryClosure: public CardTableEntryClosure { | |
| 117 int _calls; | |
| 118 G1CollectedHeap* _g1h; | |
| 119 CardTableModRefBS* _ctbs; | |
| 120 int _histo[256]; | |
| 121 public: | |
| 122 ClearLoggedCardTableEntryClosure() : | |
| 123 _calls(0) | |
| 124 { | |
| 125 _g1h = G1CollectedHeap::heap(); | |
| 126 _ctbs = (CardTableModRefBS*)_g1h->barrier_set(); | |
| 127 for (int i = 0; i < 256; i++) _histo[i] = 0; | |
| 128 } | |
| 129 bool do_card_ptr(jbyte* card_ptr, int worker_i) { | |
| 130 if (_g1h->is_in_reserved(_ctbs->addr_for(card_ptr))) { | |
| 131 _calls++; | |
| 132 unsigned char* ujb = (unsigned char*)card_ptr; | |
| 133 int ind = (int)(*ujb); | |
| 134 _histo[ind]++; | |
| 135 *card_ptr = -1; | |
| 136 } | |
| 137 return true; | |
| 138 } | |
| 139 int calls() { return _calls; } | |
| 140 void print_histo() { | |
| 141 gclog_or_tty->print_cr("Card table value histogram:"); | |
| 142 for (int i = 0; i < 256; i++) { | |
| 143 if (_histo[i] != 0) { | |
| 144 gclog_or_tty->print_cr(" %d: %d", i, _histo[i]); | |
| 145 } | |
| 146 } | |
| 147 } | |
| 148 }; | |
| 149 | |
| 150 class RedirtyLoggedCardTableEntryClosure: public CardTableEntryClosure { | |
| 151 int _calls; | |
| 152 G1CollectedHeap* _g1h; | |
| 153 CardTableModRefBS* _ctbs; | |
| 154 public: | |
| 155 RedirtyLoggedCardTableEntryClosure() : | |
| 156 _calls(0) | |
| 157 { | |
| 158 _g1h = G1CollectedHeap::heap(); | |
| 159 _ctbs = (CardTableModRefBS*)_g1h->barrier_set(); | |
| 160 } | |
| 161 bool do_card_ptr(jbyte* card_ptr, int worker_i) { | |
| 162 if (_g1h->is_in_reserved(_ctbs->addr_for(card_ptr))) { | |
| 163 _calls++; | |
| 164 *card_ptr = 0; | |
| 165 } | |
| 166 return true; | |
| 167 } | |
| 168 int calls() { return _calls; } | |
| 169 }; | |
| 170 | |
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171 class RedirtyLoggedCardTableEntryFastClosure : public CardTableEntryClosure { |
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172 public: |
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173 bool do_card_ptr(jbyte* card_ptr, int worker_i) { |
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174 *card_ptr = CardTableModRefBS::dirty_card_val(); |
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175 return true; |
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176 } |
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177 }; |
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178 |
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179 YoungList::YoungList(G1CollectedHeap* g1h) : |
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180 _g1h(g1h), _head(NULL), _length(0), _last_sampled_rs_lengths(0), |
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181 _survivor_head(NULL), _survivor_tail(NULL), _survivor_length(0) { |
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182 guarantee(check_list_empty(false), "just making sure..."); |
| 342 | 183 } |
| 184 | |
| 185 void YoungList::push_region(HeapRegion *hr) { | |
| 186 assert(!hr->is_young(), "should not already be young"); | |
| 187 assert(hr->get_next_young_region() == NULL, "cause it should!"); | |
| 188 | |
| 189 hr->set_next_young_region(_head); | |
| 190 _head = hr; | |
| 191 | |
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192 _g1h->g1_policy()->set_region_eden(hr, (int) _length); |
| 342 | 193 ++_length; |
| 194 } | |
| 195 | |
| 196 void YoungList::add_survivor_region(HeapRegion* hr) { | |
| 545 | 197 assert(hr->is_survivor(), "should be flagged as survivor region"); |
| 342 | 198 assert(hr->get_next_young_region() == NULL, "cause it should!"); |
| 199 | |
| 200 hr->set_next_young_region(_survivor_head); | |
| 201 if (_survivor_head == NULL) { | |
| 545 | 202 _survivor_tail = hr; |
| 342 | 203 } |
| 204 _survivor_head = hr; | |
| 205 ++_survivor_length; | |
| 206 } | |
| 207 | |
| 208 void YoungList::empty_list(HeapRegion* list) { | |
| 209 while (list != NULL) { | |
| 210 HeapRegion* next = list->get_next_young_region(); | |
| 211 list->set_next_young_region(NULL); | |
| 212 list->uninstall_surv_rate_group(); | |
| 213 list->set_not_young(); | |
| 214 list = next; | |
| 215 } | |
| 216 } | |
| 217 | |
| 218 void YoungList::empty_list() { | |
| 219 assert(check_list_well_formed(), "young list should be well formed"); | |
| 220 | |
| 221 empty_list(_head); | |
| 222 _head = NULL; | |
| 223 _length = 0; | |
| 224 | |
| 225 empty_list(_survivor_head); | |
| 226 _survivor_head = NULL; | |
| 545 | 227 _survivor_tail = NULL; |
| 342 | 228 _survivor_length = 0; |
| 229 | |
| 230 _last_sampled_rs_lengths = 0; | |
| 231 | |
| 232 assert(check_list_empty(false), "just making sure..."); | |
| 233 } | |
| 234 | |
| 235 bool YoungList::check_list_well_formed() { | |
| 236 bool ret = true; | |
| 237 | |
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238 uint length = 0; |
| 342 | 239 HeapRegion* curr = _head; |
| 240 HeapRegion* last = NULL; | |
| 241 while (curr != NULL) { | |
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242 if (!curr->is_young()) { |
| 342 | 243 gclog_or_tty->print_cr("### YOUNG REGION "PTR_FORMAT"-"PTR_FORMAT" " |
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244 "incorrectly tagged (y: %d, surv: %d)", |
| 342 | 245 curr->bottom(), curr->end(), |
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246 curr->is_young(), curr->is_survivor()); |
| 342 | 247 ret = false; |
| 248 } | |
| 249 ++length; | |
| 250 last = curr; | |
| 251 curr = curr->get_next_young_region(); | |
| 252 } | |
| 253 ret = ret && (length == _length); | |
| 254 | |
| 255 if (!ret) { | |
| 256 gclog_or_tty->print_cr("### YOUNG LIST seems not well formed!"); | |
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257 gclog_or_tty->print_cr("### list has %u entries, _length is %u", |
| 342 | 258 length, _length); |
| 259 } | |
| 260 | |
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261 return ret; |
| 342 | 262 } |
| 263 | |
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264 bool YoungList::check_list_empty(bool check_sample) { |
| 342 | 265 bool ret = true; |
| 266 | |
| 267 if (_length != 0) { | |
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268 gclog_or_tty->print_cr("### YOUNG LIST should have 0 length, not %u", |
| 342 | 269 _length); |
| 270 ret = false; | |
| 271 } | |
| 272 if (check_sample && _last_sampled_rs_lengths != 0) { | |
| 273 gclog_or_tty->print_cr("### YOUNG LIST has non-zero last sampled RS lengths"); | |
| 274 ret = false; | |
| 275 } | |
| 276 if (_head != NULL) { | |
| 277 gclog_or_tty->print_cr("### YOUNG LIST does not have a NULL head"); | |
| 278 ret = false; | |
| 279 } | |
| 280 if (!ret) { | |
| 281 gclog_or_tty->print_cr("### YOUNG LIST does not seem empty"); | |
| 282 } | |
| 283 | |
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284 return ret; |
| 342 | 285 } |
| 286 | |
| 287 void | |
| 288 YoungList::rs_length_sampling_init() { | |
| 289 _sampled_rs_lengths = 0; | |
| 290 _curr = _head; | |
| 291 } | |
| 292 | |
| 293 bool | |
| 294 YoungList::rs_length_sampling_more() { | |
| 295 return _curr != NULL; | |
| 296 } | |
| 297 | |
| 298 void | |
| 299 YoungList::rs_length_sampling_next() { | |
| 300 assert( _curr != NULL, "invariant" ); | |
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301 size_t rs_length = _curr->rem_set()->occupied(); |
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302 |
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303 _sampled_rs_lengths += rs_length; |
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304 |
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305 // The current region may not yet have been added to the |
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306 // incremental collection set (it gets added when it is |
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307 // retired as the current allocation region). |
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308 if (_curr->in_collection_set()) { |
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309 // Update the collection set policy information for this region |
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310 _g1h->g1_policy()->update_incremental_cset_info(_curr, rs_length); |
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311 } |
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312 |
| 342 | 313 _curr = _curr->get_next_young_region(); |
| 314 if (_curr == NULL) { | |
| 315 _last_sampled_rs_lengths = _sampled_rs_lengths; | |
| 316 // gclog_or_tty->print_cr("last sampled RS lengths = %d", _last_sampled_rs_lengths); | |
| 317 } | |
| 318 } | |
| 319 | |
| 320 void | |
| 321 YoungList::reset_auxilary_lists() { | |
| 322 guarantee( is_empty(), "young list should be empty" ); | |
| 323 assert(check_list_well_formed(), "young list should be well formed"); | |
| 324 | |
| 325 // Add survivor regions to SurvRateGroup. | |
| 326 _g1h->g1_policy()->note_start_adding_survivor_regions(); | |
| 545 | 327 _g1h->g1_policy()->finished_recalculating_age_indexes(true /* is_survivors */); |
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328 |
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329 int young_index_in_cset = 0; |
| 342 | 330 for (HeapRegion* curr = _survivor_head; |
| 331 curr != NULL; | |
| 332 curr = curr->get_next_young_region()) { | |
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333 _g1h->g1_policy()->set_region_survivor(curr, young_index_in_cset); |
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334 |
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335 // The region is a non-empty survivor so let's add it to |
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336 // the incremental collection set for the next evacuation |
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337 // pause. |
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338 _g1h->g1_policy()->add_region_to_incremental_cset_rhs(curr); |
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339 young_index_in_cset += 1; |
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340 } |
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341 assert((uint) young_index_in_cset == _survivor_length, "post-condition"); |
| 342 | 342 _g1h->g1_policy()->note_stop_adding_survivor_regions(); |
| 343 | |
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344 _head = _survivor_head; |
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345 _length = _survivor_length; |
| 342 | 346 if (_survivor_head != NULL) { |
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347 assert(_survivor_tail != NULL, "cause it shouldn't be"); |
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348 assert(_survivor_length > 0, "invariant"); |
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349 _survivor_tail->set_next_young_region(NULL); |
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350 } |
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351 |
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352 // Don't clear the survivor list handles until the start of |
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353 // the next evacuation pause - we need it in order to re-tag |
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354 // the survivor regions from this evacuation pause as 'young' |
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355 // at the start of the next. |
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356 |
| 545 | 357 _g1h->g1_policy()->finished_recalculating_age_indexes(false /* is_survivors */); |
| 342 | 358 |
| 359 assert(check_list_well_formed(), "young list should be well formed"); | |
| 360 } | |
| 361 | |
| 362 void YoungList::print() { | |
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363 HeapRegion* lists[] = {_head, _survivor_head}; |
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364 const char* names[] = {"YOUNG", "SURVIVOR"}; |
| 342 | 365 |
| 366 for (unsigned int list = 0; list < ARRAY_SIZE(lists); ++list) { | |
| 367 gclog_or_tty->print_cr("%s LIST CONTENTS", names[list]); | |
| 368 HeapRegion *curr = lists[list]; | |
| 369 if (curr == NULL) | |
| 370 gclog_or_tty->print_cr(" empty"); | |
| 371 while (curr != NULL) { | |
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372 gclog_or_tty->print_cr(" "HR_FORMAT", P: "PTR_FORMAT "N: "PTR_FORMAT", age: %4d", |
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373 HR_FORMAT_PARAMS(curr), |
| 342 | 374 curr->prev_top_at_mark_start(), |
| 375 curr->next_top_at_mark_start(), | |
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376 curr->age_in_surv_rate_group_cond()); |
| 342 | 377 curr = curr->get_next_young_region(); |
| 378 } | |
| 379 } | |
| 380 | |
| 381 gclog_or_tty->print_cr(""); | |
| 382 } | |
| 383 | |
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384 void G1CollectedHeap::push_dirty_cards_region(HeapRegion* hr) |
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385 { |
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386 // Claim the right to put the region on the dirty cards region list |
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387 // by installing a self pointer. |
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388 HeapRegion* next = hr->get_next_dirty_cards_region(); |
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389 if (next == NULL) { |
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390 HeapRegion* res = (HeapRegion*) |
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391 Atomic::cmpxchg_ptr(hr, hr->next_dirty_cards_region_addr(), |
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392 NULL); |
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393 if (res == NULL) { |
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394 HeapRegion* head; |
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395 do { |
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396 // Put the region to the dirty cards region list. |
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397 head = _dirty_cards_region_list; |
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398 next = (HeapRegion*) |
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399 Atomic::cmpxchg_ptr(hr, &_dirty_cards_region_list, head); |
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400 if (next == head) { |
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401 assert(hr->get_next_dirty_cards_region() == hr, |
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402 "hr->get_next_dirty_cards_region() != hr"); |
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403 if (next == NULL) { |
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404 // The last region in the list points to itself. |
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405 hr->set_next_dirty_cards_region(hr); |
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406 } else { |
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407 hr->set_next_dirty_cards_region(next); |
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408 } |
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409 } |
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410 } while (next != head); |
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411 } |
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412 } |
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413 } |
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414 |
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415 HeapRegion* G1CollectedHeap::pop_dirty_cards_region() |
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416 { |
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417 HeapRegion* head; |
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418 HeapRegion* hr; |
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419 do { |
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420 head = _dirty_cards_region_list; |
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421 if (head == NULL) { |
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422 return NULL; |
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423 } |
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424 HeapRegion* new_head = head->get_next_dirty_cards_region(); |
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425 if (head == new_head) { |
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426 // The last region. |
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427 new_head = NULL; |
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428 } |
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429 hr = (HeapRegion*)Atomic::cmpxchg_ptr(new_head, &_dirty_cards_region_list, |
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430 head); |
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431 } while (hr != head); |
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432 assert(hr != NULL, "invariant"); |
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433 hr->set_next_dirty_cards_region(NULL); |
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434 return hr; |
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435 } |
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436 |
| 342 | 437 void G1CollectedHeap::stop_conc_gc_threads() { |
| 794 | 438 _cg1r->stop(); |
| 342 | 439 _cmThread->stop(); |
| 440 } | |
| 441 | |
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442 #ifdef ASSERT |
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443 // A region is added to the collection set as it is retired |
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444 // so an address p can point to a region which will be in the |
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445 // collection set but has not yet been retired. This method |
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446 // therefore is only accurate during a GC pause after all |
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447 // regions have been retired. It is used for debugging |
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448 // to check if an nmethod has references to objects that can |
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449 // be move during a partial collection. Though it can be |
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450 // inaccurate, it is sufficient for G1 because the conservative |
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451 // implementation of is_scavengable() for G1 will indicate that |
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452 // all nmethods must be scanned during a partial collection. |
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453 bool G1CollectedHeap::is_in_partial_collection(const void* p) { |
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454 HeapRegion* hr = heap_region_containing(p); |
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455 return hr != NULL && hr->in_collection_set(); |
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456 } |
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457 #endif |
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458 |
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459 // Returns true if the reference points to an object that |
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460 // can move in an incremental collecction. |
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461 bool G1CollectedHeap::is_scavengable(const void* p) { |
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462 G1CollectedHeap* g1h = G1CollectedHeap::heap(); |
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463 G1CollectorPolicy* g1p = g1h->g1_policy(); |
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464 HeapRegion* hr = heap_region_containing(p); |
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465 if (hr == NULL) { |
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466 // perm gen (or null) |
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467 return false; |
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468 } else { |
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469 return !hr->isHumongous(); |
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470 } |
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471 } |
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472 |
| 342 | 473 void G1CollectedHeap::check_ct_logs_at_safepoint() { |
| 474 DirtyCardQueueSet& dcqs = JavaThread::dirty_card_queue_set(); | |
| 475 CardTableModRefBS* ct_bs = (CardTableModRefBS*)barrier_set(); | |
| 476 | |
| 477 // Count the dirty cards at the start. | |
| 478 CountNonCleanMemRegionClosure count1(this); | |
| 479 ct_bs->mod_card_iterate(&count1); | |
| 480 int orig_count = count1.n(); | |
| 481 | |
| 482 // First clear the logged cards. | |
| 483 ClearLoggedCardTableEntryClosure clear; | |
| 484 dcqs.set_closure(&clear); | |
| 485 dcqs.apply_closure_to_all_completed_buffers(); | |
| 486 dcqs.iterate_closure_all_threads(false); | |
| 487 clear.print_histo(); | |
| 488 | |
| 489 // Now ensure that there's no dirty cards. | |
| 490 CountNonCleanMemRegionClosure count2(this); | |
| 491 ct_bs->mod_card_iterate(&count2); | |
| 492 if (count2.n() != 0) { | |
| 493 gclog_or_tty->print_cr("Card table has %d entries; %d originally", | |
| 494 count2.n(), orig_count); | |
| 495 } | |
| 496 guarantee(count2.n() == 0, "Card table should be clean."); | |
| 497 | |
| 498 RedirtyLoggedCardTableEntryClosure redirty; | |
| 499 JavaThread::dirty_card_queue_set().set_closure(&redirty); | |
| 500 dcqs.apply_closure_to_all_completed_buffers(); | |
| 501 dcqs.iterate_closure_all_threads(false); | |
| 502 gclog_or_tty->print_cr("Log entries = %d, dirty cards = %d.", | |
| 503 clear.calls(), orig_count); | |
| 504 guarantee(redirty.calls() == clear.calls(), | |
| 505 "Or else mechanism is broken."); | |
| 506 | |
| 507 CountNonCleanMemRegionClosure count3(this); | |
| 508 ct_bs->mod_card_iterate(&count3); | |
| 509 if (count3.n() != orig_count) { | |
| 510 gclog_or_tty->print_cr("Should have restored them all: orig = %d, final = %d.", | |
| 511 orig_count, count3.n()); | |
| 512 guarantee(count3.n() >= orig_count, "Should have restored them all."); | |
| 513 } | |
| 514 | |
| 515 JavaThread::dirty_card_queue_set().set_closure(_refine_cte_cl); | |
| 516 } | |
| 517 | |
| 518 // Private class members. | |
| 519 | |
| 520 G1CollectedHeap* G1CollectedHeap::_g1h; | |
| 521 | |
| 522 // Private methods. | |
| 523 | |
| 2152 | 524 HeapRegion* |
| 2361 | 525 G1CollectedHeap::new_region_try_secondary_free_list() { |
| 2152 | 526 MutexLockerEx x(SecondaryFreeList_lock, Mutex::_no_safepoint_check_flag); |
| 527 while (!_secondary_free_list.is_empty() || free_regions_coming()) { | |
| 528 if (!_secondary_free_list.is_empty()) { | |
| 529 if (G1ConcRegionFreeingVerbose) { | |
| 530 gclog_or_tty->print_cr("G1ConcRegionFreeing [region alloc] : " | |
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531 "secondary_free_list has %u entries", |
| 2152 | 532 _secondary_free_list.length()); |
| 533 } | |
| 534 // It looks as if there are free regions available on the | |
| 535 // secondary_free_list. Let's move them to the free_list and try | |
| 536 // again to allocate from it. | |
| 537 append_secondary_free_list(); | |
| 538 | |
| 539 assert(!_free_list.is_empty(), "if the secondary_free_list was not " | |
| 540 "empty we should have moved at least one entry to the free_list"); | |
| 541 HeapRegion* res = _free_list.remove_head(); | |
| 542 if (G1ConcRegionFreeingVerbose) { | |
| 543 gclog_or_tty->print_cr("G1ConcRegionFreeing [region alloc] : " | |
| 544 "allocated "HR_FORMAT" from secondary_free_list", | |
| 545 HR_FORMAT_PARAMS(res)); | |
| 546 } | |
| 547 return res; | |
| 548 } | |
| 549 | |
| 550 // Wait here until we get notifed either when (a) there are no | |
| 551 // more free regions coming or (b) some regions have been moved on | |
| 552 // the secondary_free_list. | |
| 553 SecondaryFreeList_lock->wait(Mutex::_no_safepoint_check_flag); | |
| 554 } | |
| 555 | |
| 556 if (G1ConcRegionFreeingVerbose) { | |
| 557 gclog_or_tty->print_cr("G1ConcRegionFreeing [region alloc] : " | |
| 558 "could not allocate from secondary_free_list"); | |
| 559 } | |
| 560 return NULL; | |
| 561 } | |
| 562 | |
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563 HeapRegion* G1CollectedHeap::new_region(size_t word_size, bool do_expand) { |
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564 assert(!isHumongous(word_size) || word_size <= HeapRegion::GrainWords, |
| 2152 | 565 "the only time we use this to allocate a humongous region is " |
| 566 "when we are allocating a single humongous region"); | |
| 567 | |
| 568 HeapRegion* res; | |
| 569 if (G1StressConcRegionFreeing) { | |
| 570 if (!_secondary_free_list.is_empty()) { | |
| 571 if (G1ConcRegionFreeingVerbose) { | |
| 572 gclog_or_tty->print_cr("G1ConcRegionFreeing [region alloc] : " | |
| 573 "forced to look at the secondary_free_list"); | |
| 574 } | |
| 2361 | 575 res = new_region_try_secondary_free_list(); |
| 2152 | 576 if (res != NULL) { |
| 577 return res; | |
| 578 } | |
| 579 } | |
| 580 } | |
| 581 res = _free_list.remove_head_or_null(); | |
| 582 if (res == NULL) { | |
| 583 if (G1ConcRegionFreeingVerbose) { | |
| 584 gclog_or_tty->print_cr("G1ConcRegionFreeing [region alloc] : " | |
| 585 "res == NULL, trying the secondary_free_list"); | |
| 586 } | |
| 2361 | 587 res = new_region_try_secondary_free_list(); |
| 2152 | 588 } |
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589 if (res == NULL && do_expand && _expand_heap_after_alloc_failure) { |
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590 // Currently, only attempts to allocate GC alloc regions set |
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591 // do_expand to true. So, we should only reach here during a |
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592 // safepoint. If this assumption changes we might have to |
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593 // reconsider the use of _expand_heap_after_alloc_failure. |
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594 assert(SafepointSynchronize::is_at_safepoint(), "invariant"); |
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595 |
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596 ergo_verbose1(ErgoHeapSizing, |
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597 "attempt heap expansion", |
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598 ergo_format_reason("region allocation request failed") |
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599 ergo_format_byte("allocation request"), |
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600 word_size * HeapWordSize); |
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601 if (expand(word_size * HeapWordSize)) { |
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602 // Given that expand() succeeded in expanding the heap, and we |
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603 // always expand the heap by an amount aligned to the heap |
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604 // region size, the free list should in theory not be empty. So |
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605 // it would probably be OK to use remove_head(). But the extra |
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606 // check for NULL is unlikely to be a performance issue here (we |
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607 // just expanded the heap!) so let's just be conservative and |
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608 // use remove_head_or_null(). |
| 3766 | 609 res = _free_list.remove_head_or_null(); |
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610 } else { |
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611 _expand_heap_after_alloc_failure = false; |
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612 } |
| 342 | 613 } |
| 614 return res; | |
| 615 } | |
| 616 | |
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617 uint G1CollectedHeap::humongous_obj_allocate_find_first(uint num_regions, |
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618 size_t word_size) { |
| 2361 | 619 assert(isHumongous(word_size), "word_size should be humongous"); |
| 620 assert(num_regions * HeapRegion::GrainWords >= word_size, "pre-condition"); | |
| 621 | |
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622 uint first = G1_NULL_HRS_INDEX; |
| 2152 | 623 if (num_regions == 1) { |
| 624 // Only one region to allocate, no need to go through the slower | |
| 625 // path. The caller will attempt the expasion if this fails, so | |
| 626 // let's not try to expand here too. | |
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627 HeapRegion* hr = new_region(word_size, false /* do_expand */); |
| 2152 | 628 if (hr != NULL) { |
| 629 first = hr->hrs_index(); | |
| 630 } else { | |
| 3766 | 631 first = G1_NULL_HRS_INDEX; |
| 2152 | 632 } |
| 633 } else { | |
| 634 // We can't allocate humongous regions while cleanupComplete() is | |
| 635 // running, since some of the regions we find to be empty might not | |
| 636 // yet be added to the free list and it is not straightforward to | |
| 637 // know which list they are on so that we can remove them. Note | |
| 638 // that we only need to do this if we need to allocate more than | |
| 639 // one region to satisfy the current humongous allocation | |
| 640 // request. If we are only allocating one region we use the common | |
| 641 // region allocation code (see above). | |
| 642 wait_while_free_regions_coming(); | |
| 2361 | 643 append_secondary_free_list_if_not_empty_with_lock(); |
| 2152 | 644 |
| 645 if (free_regions() >= num_regions) { | |
| 3766 | 646 first = _hrs.find_contiguous(num_regions); |
| 647 if (first != G1_NULL_HRS_INDEX) { | |
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648 for (uint i = first; i < first + num_regions; ++i) { |
| 3766 | 649 HeapRegion* hr = region_at(i); |
| 2152 | 650 assert(hr->is_empty(), "sanity"); |
| 2361 | 651 assert(is_on_master_free_list(hr), "sanity"); |
| 2152 | 652 hr->set_pending_removal(true); |
| 653 } | |
| 654 _free_list.remove_all_pending(num_regions); | |
| 655 } | |
| 656 } | |
| 657 } | |
| 658 return first; | |
| 659 } | |
| 660 | |
| 2361 | 661 HeapWord* |
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662 G1CollectedHeap::humongous_obj_allocate_initialize_regions(uint first, |
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663 uint num_regions, |
| 2361 | 664 size_t word_size) { |
| 3766 | 665 assert(first != G1_NULL_HRS_INDEX, "pre-condition"); |
| 2361 | 666 assert(isHumongous(word_size), "word_size should be humongous"); |
| 667 assert(num_regions * HeapRegion::GrainWords >= word_size, "pre-condition"); | |
| 668 | |
| 669 // Index of last region in the series + 1. | |
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670 uint last = first + num_regions; |
| 2361 | 671 |
| 672 // We need to initialize the region(s) we just discovered. This is | |
| 673 // a bit tricky given that it can happen concurrently with | |
| 674 // refinement threads refining cards on these regions and | |
| 675 // potentially wanting to refine the BOT as they are scanning | |
| 676 // those cards (this can happen shortly after a cleanup; see CR | |
| 677 // 6991377). So we have to set up the region(s) carefully and in | |
| 678 // a specific order. | |
| 679 | |
| 680 // The word size sum of all the regions we will allocate. | |
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681 size_t word_size_sum = (size_t) num_regions * HeapRegion::GrainWords; |
| 2361 | 682 assert(word_size <= word_size_sum, "sanity"); |
| 683 | |
| 684 // This will be the "starts humongous" region. | |
| 3766 | 685 HeapRegion* first_hr = region_at(first); |
| 2361 | 686 // The header of the new object will be placed at the bottom of |
| 687 // the first region. | |
| 688 HeapWord* new_obj = first_hr->bottom(); | |
| 689 // This will be the new end of the first region in the series that | |
| 690 // should also match the end of the last region in the seriers. | |
| 691 HeapWord* new_end = new_obj + word_size_sum; | |
| 692 // This will be the new top of the first region that will reflect | |
| 693 // this allocation. | |
| 694 HeapWord* new_top = new_obj + word_size; | |
| 695 | |
| 696 // First, we need to zero the header of the space that we will be | |
| 697 // allocating. When we update top further down, some refinement | |
| 698 // threads might try to scan the region. By zeroing the header we | |
| 699 // ensure that any thread that will try to scan the region will | |
| 700 // come across the zero klass word and bail out. | |
| 701 // | |
| 702 // NOTE: It would not have been correct to have used | |
| 703 // CollectedHeap::fill_with_object() and make the space look like | |
| 704 // an int array. The thread that is doing the allocation will | |
| 705 // later update the object header to a potentially different array | |
| 706 // type and, for a very short period of time, the klass and length | |
| 707 // fields will be inconsistent. This could cause a refinement | |
| 708 // thread to calculate the object size incorrectly. | |
| 709 Copy::fill_to_words(new_obj, oopDesc::header_size(), 0); | |
| 710 | |
| 711 // We will set up the first region as "starts humongous". This | |
| 712 // will also update the BOT covering all the regions to reflect | |
| 713 // that there is a single object that starts at the bottom of the | |
| 714 // first region. | |
| 715 first_hr->set_startsHumongous(new_top, new_end); | |
| 716 | |
| 717 // Then, if there are any, we will set up the "continues | |
| 718 // humongous" regions. | |
| 719 HeapRegion* hr = NULL; | |
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720 for (uint i = first + 1; i < last; ++i) { |
| 3766 | 721 hr = region_at(i); |
| 2361 | 722 hr->set_continuesHumongous(first_hr); |
| 723 } | |
| 724 // If we have "continues humongous" regions (hr != NULL), then the | |
| 725 // end of the last one should match new_end. | |
| 726 assert(hr == NULL || hr->end() == new_end, "sanity"); | |
| 727 | |
| 728 // Up to this point no concurrent thread would have been able to | |
| 729 // do any scanning on any region in this series. All the top | |
| 730 // fields still point to bottom, so the intersection between | |
| 731 // [bottom,top] and [card_start,card_end] will be empty. Before we | |
| 732 // update the top fields, we'll do a storestore to make sure that | |
| 733 // no thread sees the update to top before the zeroing of the | |
| 734 // object header and the BOT initialization. | |
| 735 OrderAccess::storestore(); | |
| 736 | |
| 737 // Now that the BOT and the object header have been initialized, | |
| 738 // we can update top of the "starts humongous" region. | |
| 739 assert(first_hr->bottom() < new_top && new_top <= first_hr->end(), | |
| 740 "new_top should be in this region"); | |
| 741 first_hr->set_top(new_top); | |
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742 if (_hr_printer.is_active()) { |
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743 HeapWord* bottom = first_hr->bottom(); |
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744 HeapWord* end = first_hr->orig_end(); |
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745 if ((first + 1) == last) { |
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746 // the series has a single humongous region |
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747 _hr_printer.alloc(G1HRPrinter::SingleHumongous, first_hr, new_top); |
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748 } else { |
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749 // the series has more than one humongous regions |
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750 _hr_printer.alloc(G1HRPrinter::StartsHumongous, first_hr, end); |
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751 } |
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752 } |
| 2361 | 753 |
| 754 // Now, we will update the top fields of the "continues humongous" | |
| 755 // regions. The reason we need to do this is that, otherwise, | |
| 756 // these regions would look empty and this will confuse parts of | |
| 757 // G1. For example, the code that looks for a consecutive number | |
| 758 // of empty regions will consider them empty and try to | |
| 759 // re-allocate them. We can extend is_empty() to also include | |
| 760 // !continuesHumongous(), but it is easier to just update the top | |
| 761 // fields here. The way we set top for all regions (i.e., top == | |
| 762 // end for all regions but the last one, top == new_top for the | |
| 763 // last one) is actually used when we will free up the humongous | |
| 764 // region in free_humongous_region(). | |
| 765 hr = NULL; | |
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766 for (uint i = first + 1; i < last; ++i) { |
| 3766 | 767 hr = region_at(i); |
| 2361 | 768 if ((i + 1) == last) { |
| 769 // last continues humongous region | |
| 770 assert(hr->bottom() < new_top && new_top <= hr->end(), | |
| 771 "new_top should fall on this region"); | |
| 772 hr->set_top(new_top); | |
|
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773 _hr_printer.alloc(G1HRPrinter::ContinuesHumongous, hr, new_top); |
| 2361 | 774 } else { |
| 775 // not last one | |
| 776 assert(new_top > hr->end(), "new_top should be above this region"); | |
| 777 hr->set_top(hr->end()); | |
|
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778 _hr_printer.alloc(G1HRPrinter::ContinuesHumongous, hr, hr->end()); |
| 2361 | 779 } |
| 780 } | |
| 781 // If we have continues humongous regions (hr != NULL), then the | |
| 782 // end of the last one should match new_end and its top should | |
| 783 // match new_top. | |
| 784 assert(hr == NULL || | |
| 785 (hr->end() == new_end && hr->top() == new_top), "sanity"); | |
| 786 | |
| 787 assert(first_hr->used() == word_size * HeapWordSize, "invariant"); | |
| 788 _summary_bytes_used += first_hr->used(); | |
| 789 _humongous_set.add(first_hr); | |
| 790 | |
| 791 return new_obj; | |
| 792 } | |
| 793 | |
| 342 | 794 // If could fit into free regions w/o expansion, try. |
| 795 // Otherwise, if can expand, do so. | |
| 796 // Otherwise, if using ex regions might help, try with ex given back. | |
| 1973 | 797 HeapWord* G1CollectedHeap::humongous_obj_allocate(size_t word_size) { |
| 2152 | 798 assert_heap_locked_or_at_safepoint(true /* should_be_vm_thread */); |
| 799 | |
| 800 verify_region_sets_optional(); | |
| 342 | 801 |
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802 size_t word_size_rounded = round_to(word_size, HeapRegion::GrainWords); |
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803 uint num_regions = (uint) (word_size_rounded / HeapRegion::GrainWords); |
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804 uint x_num = expansion_regions(); |
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805 uint fs = _hrs.free_suffix(); |
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806 uint first = humongous_obj_allocate_find_first(num_regions, word_size); |
| 3766 | 807 if (first == G1_NULL_HRS_INDEX) { |
| 2152 | 808 // The only thing we can do now is attempt expansion. |
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809 if (fs + x_num >= num_regions) { |
|
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810 // If the number of regions we're trying to allocate for this |
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811 // object is at most the number of regions in the free suffix, |
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812 // then the call to humongous_obj_allocate_find_first() above |
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813 // should have succeeded and we wouldn't be here. |
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814 // |
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815 // We should only be trying to expand when the free suffix is |
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816 // not sufficient for the object _and_ we have some expansion |
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817 // room available. |
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818 assert(num_regions > fs, "earlier allocation should have succeeded"); |
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819 |
|
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820 ergo_verbose1(ErgoHeapSizing, |
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821 "attempt heap expansion", |
|
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822 ergo_format_reason("humongous allocation request failed") |
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823 ergo_format_byte("allocation request"), |
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824 word_size * HeapWordSize); |
|
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825 if (expand((num_regions - fs) * HeapRegion::GrainBytes)) { |
| 3766 | 826 // Even though the heap was expanded, it might not have |
| 827 // reached the desired size. So, we cannot assume that the | |
| 828 // allocation will succeed. | |
|
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829 first = humongous_obj_allocate_find_first(num_regions, word_size); |
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|
830 } |
| 2152 | 831 } |
| 832 } | |
| 833 | |
| 2361 | 834 HeapWord* result = NULL; |
| 3766 | 835 if (first != G1_NULL_HRS_INDEX) { |
| 2361 | 836 result = |
| 837 humongous_obj_allocate_initialize_regions(first, num_regions, word_size); | |
| 838 assert(result != NULL, "it should always return a valid result"); | |
|
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|
839 |
|
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|
840 // A successful humongous object allocation changes the used space |
|
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|
841 // information of the old generation so we need to recalculate the |
|
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842 // sizes and update the jstat counters here. |
|
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|
843 g1mm()->update_sizes(); |
| 2152 | 844 } |
| 845 | |
| 846 verify_region_sets_optional(); | |
| 2361 | 847 |
| 848 return result; | |
| 342 | 849 } |
| 850 | |
| 1973 | 851 HeapWord* G1CollectedHeap::allocate_new_tlab(size_t word_size) { |
| 852 assert_heap_not_locked_and_not_at_safepoint(); | |
|
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853 assert(!isHumongous(word_size), "we do not allow humongous TLABs"); |
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|
854 |
|
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|
855 unsigned int dummy_gc_count_before; |
|
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|
856 return attempt_allocation(word_size, &dummy_gc_count_before); |
| 342 | 857 } |
| 858 | |
| 859 HeapWord* | |
| 860 G1CollectedHeap::mem_allocate(size_t word_size, | |
| 1973 | 861 bool* gc_overhead_limit_was_exceeded) { |
| 862 assert_heap_not_locked_and_not_at_safepoint(); | |
| 342 | 863 |
|
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|
864 // Loop until the allocation is satisified, or unsatisfied after GC. |
| 1973 | 865 for (int try_count = 1; /* we'll return */; try_count += 1) { |
| 866 unsigned int gc_count_before; | |
|
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|
867 |
|
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|
868 HeapWord* result = NULL; |
|
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|
869 if (!isHumongous(word_size)) { |
|
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|
870 result = attempt_allocation(word_size, &gc_count_before); |
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871 } else { |
|
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|
872 result = attempt_allocation_humongous(word_size, &gc_count_before); |
|
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|
873 } |
|
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|
874 if (result != NULL) { |
|
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|
875 return result; |
| 342 | 876 } |
| 877 | |
| 878 // Create the garbage collection operation... | |
| 1973 | 879 VM_G1CollectForAllocation op(gc_count_before, word_size); |
| 342 | 880 // ...and get the VM thread to execute it. |
| 881 VMThread::execute(&op); | |
| 1973 | 882 |
| 883 if (op.prologue_succeeded() && op.pause_succeeded()) { | |
| 884 // If the operation was successful we'll return the result even | |
| 885 // if it is NULL. If the allocation attempt failed immediately | |
| 886 // after a Full GC, it's unlikely we'll be able to allocate now. | |
| 887 HeapWord* result = op.result(); | |
| 888 if (result != NULL && !isHumongous(word_size)) { | |
| 889 // Allocations that take place on VM operations do not do any | |
| 890 // card dirtying and we have to do it here. We only have to do | |
| 891 // this for non-humongous allocations, though. | |
| 892 dirty_young_block(result, word_size); | |
| 893 } | |
| 342 | 894 return result; |
| 1973 | 895 } else { |
| 896 assert(op.result() == NULL, | |
| 897 "the result should be NULL if the VM op did not succeed"); | |
| 342 | 898 } |
| 899 | |
| 900 // Give a warning if we seem to be looping forever. | |
| 901 if ((QueuedAllocationWarningCount > 0) && | |
| 902 (try_count % QueuedAllocationWarningCount == 0)) { | |
| 1973 | 903 warning("G1CollectedHeap::mem_allocate retries %d times", try_count); |
| 342 | 904 } |
| 905 } | |
| 1973 | 906 |
| 907 ShouldNotReachHere(); | |
|
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|
908 return NULL; |
| 342 | 909 } |
| 910 | |
|
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|
911 HeapWord* G1CollectedHeap::attempt_allocation_slow(size_t word_size, |
|
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|
912 unsigned int *gc_count_before_ret) { |
|
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|
913 // Make sure you read the note in attempt_allocation_humongous(). |
|
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|
914 |
|
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|
915 assert_heap_not_locked_and_not_at_safepoint(); |
|
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|
916 assert(!isHumongous(word_size), "attempt_allocation_slow() should not " |
|
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|
917 "be called for humongous allocation requests"); |
|
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|
918 |
|
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|
919 // We should only get here after the first-level allocation attempt |
|
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|
920 // (attempt_allocation()) failed to allocate. |
|
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|
921 |
|
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|
922 // We will loop until a) we manage to successfully perform the |
|
abdfc822206f
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|
923 // allocation or b) we successfully schedule a collection which |
|
abdfc822206f
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|
924 // fails to perform the allocation. b) is the only case when we'll |
|
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|
925 // return NULL. |
|
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|
926 HeapWord* result = NULL; |
|
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|
927 for (int try_count = 1; /* we'll return */; try_count += 1) { |
|
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|
928 bool should_try_gc; |
|
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|
929 unsigned int gc_count_before; |
|
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|
930 |
|
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|
931 { |
|
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|
932 MutexLockerEx x(Heap_lock); |
|
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|
933 |
|
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|
934 result = _mutator_alloc_region.attempt_allocation_locked(word_size, |
|
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|
935 false /* bot_updates */); |
|
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|
936 if (result != NULL) { |
|
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|
937 return result; |
|
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|
938 } |
|
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|
939 |
|
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|
940 // If we reach here, attempt_allocation_locked() above failed to |
|
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|
941 // allocate a new region. So the mutator alloc region should be NULL. |
|
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|
942 assert(_mutator_alloc_region.get() == NULL, "only way to get here"); |
|
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|
943 |
|
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|
944 if (GC_locker::is_active_and_needs_gc()) { |
|
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|
945 if (g1_policy()->can_expand_young_list()) { |
|
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|
946 // No need for an ergo verbose message here, |
|
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|
947 // can_expand_young_list() does this when it returns true. |
|
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|
948 result = _mutator_alloc_region.attempt_allocation_force(word_size, |
|
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|
949 false /* bot_updates */); |
|
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|
950 if (result != NULL) { |
|
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|
951 return result; |
|
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|
952 } |
|
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|
953 } |
|
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|
954 should_try_gc = false; |
|
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|
955 } else { |
|
6106
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|
956 // The GCLocker may not be active but the GCLocker initiated |
|
1d478c993020
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|
957 // GC may not yet have been performed (GCLocker::needs_gc() |
|
1d478c993020
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958 // returns true). In this case we do not try this GC and |
|
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959 // wait until the GCLocker initiated GC is performed, and |
|
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|
960 // then retry the allocation. |
|
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961 if (GC_locker::needs_gc()) { |
|
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962 should_try_gc = false; |
|
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|
963 } else { |
|
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|
964 // Read the GC count while still holding the Heap_lock. |
|
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|
965 gc_count_before = total_collections(); |
|
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966 should_try_gc = true; |
|
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|
967 } |
|
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|
968 } |
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969 } |
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970 |
|
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|
971 if (should_try_gc) { |
|
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972 bool succeeded; |
|
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973 result = do_collection_pause(word_size, gc_count_before, &succeeded); |
|
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974 if (result != NULL) { |
|
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975 assert(succeeded, "only way to get back a non-NULL result"); |
|
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|
976 return result; |
|
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|
977 } |
|
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|
978 |
|
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|
979 if (succeeded) { |
|
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980 // If we get here we successfully scheduled a collection which |
|
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981 // failed to allocate. No point in trying to allocate |
|
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982 // further. We'll just return NULL. |
|
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983 MutexLockerEx x(Heap_lock); |
|
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984 *gc_count_before_ret = total_collections(); |
|
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985 return NULL; |
|
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|
986 } |
|
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987 } else { |
|
6106
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988 // The GCLocker is either active or the GCLocker initiated |
|
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989 // GC has not yet been performed. Stall until it is and |
|
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990 // then retry the allocation. |
|
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991 GC_locker::stall_until_clear(); |
|
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992 } |
|
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|
993 |
|
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|
994 // We can reach here if we were unsuccessul in scheduling a |
|
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995 // collection (because another thread beat us to it) or if we were |
|
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996 // stalled due to the GC locker. In either can we should retry the |
|
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|
997 // allocation attempt in case another thread successfully |
|
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|
998 // performed a collection and reclaimed enough space. We do the |
|
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999 // first attempt (without holding the Heap_lock) here and the |
|
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1000 // follow-on attempt will be at the start of the next loop |
|
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1001 // iteration (after taking the Heap_lock). |
|
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|
1002 result = _mutator_alloc_region.attempt_allocation(word_size, |
|
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1003 false /* bot_updates */); |
|
5963
64bf7c8270cb
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4912
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1004 if (result != NULL) { |
|
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1005 return result; |
|
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|
1006 } |
|
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|
1007 |
|
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|
1008 // Give a warning if we seem to be looping forever. |
|
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1009 if ((QueuedAllocationWarningCount > 0) && |
|
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1010 (try_count % QueuedAllocationWarningCount == 0)) { |
|
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1011 warning("G1CollectedHeap::attempt_allocation_slow() " |
|
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1012 "retries %d times", try_count); |
|
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1013 } |
|
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1014 } |
|
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|
1015 |
|
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|
1016 ShouldNotReachHere(); |
|
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|
1017 return NULL; |
|
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|
1018 } |
|
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|
1019 |
|
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|
1020 HeapWord* G1CollectedHeap::attempt_allocation_humongous(size_t word_size, |
|
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1021 unsigned int * gc_count_before_ret) { |
|
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1022 // The structure of this method has a lot of similarities to |
|
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|
1023 // attempt_allocation_slow(). The reason these two were not merged |
|
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1024 // into a single one is that such a method would require several "if |
|
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1025 // allocation is not humongous do this, otherwise do that" |
|
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|
1026 // conditional paths which would obscure its flow. In fact, an early |
|
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|
1027 // version of this code did use a unified method which was harder to |
|
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|
1028 // follow and, as a result, it had subtle bugs that were hard to |
|
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|
1029 // track down. So keeping these two methods separate allows each to |
|
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|
1030 // be more readable. It will be good to keep these two in sync as |
|
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|
1031 // much as possible. |
|
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|
1032 |
|
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|
1033 assert_heap_not_locked_and_not_at_safepoint(); |
|
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|
1034 assert(isHumongous(word_size), "attempt_allocation_humongous() " |
|
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|
1035 "should only be called for humongous allocations"); |
|
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|
1036 |
|
4834
6a78aa6ac1ff
7132311: G1: assert((s == klass->oop_size(this)) || (Universe::heap()->is_gc_active() && ((is_typeArray()...
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|
1037 // Humongous objects can exhaust the heap quickly, so we should check if we |
|
6a78aa6ac1ff
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|
1038 // need to start a marking cycle at each humongous object allocation. We do |
|
6a78aa6ac1ff
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|
1039 // the check before we do the actual allocation. The reason for doing it |
|
6a78aa6ac1ff
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|
1040 // before the allocation is that we avoid having to keep track of the newly |
|
6a78aa6ac1ff
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|
1041 // allocated memory while we do a GC. |
|
4910
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|
1042 if (g1_policy()->need_to_start_conc_mark("concurrent humongous allocation", |
|
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|
1043 word_size)) { |
|
4834
6a78aa6ac1ff
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|
1044 collect(GCCause::_g1_humongous_allocation); |
|
6a78aa6ac1ff
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|
1045 } |
|
6a78aa6ac1ff
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|
1046 |
|
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|
1047 // We will loop until a) we manage to successfully perform the |
|
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|
1048 // allocation or b) we successfully schedule a collection which |
|
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|
1049 // fails to perform the allocation. b) is the only case when we'll |
|
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|
1050 // return NULL. |
|
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|
1051 HeapWord* result = NULL; |
|
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|
1052 for (int try_count = 1; /* we'll return */; try_count += 1) { |
|
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|
1053 bool should_try_gc; |
|
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|
1054 unsigned int gc_count_before; |
|
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|
1055 |
|
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|
1056 { |
|
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|
1057 MutexLockerEx x(Heap_lock); |
|
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|
1058 |
|
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|
1059 // Given that humongous objects are not allocated in young |
|
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|
1060 // regions, we'll first try to do the allocation without doing a |
|
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|
1061 // collection hoping that there's enough space in the heap. |
|
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|
1062 result = humongous_obj_allocate(word_size); |
|
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diff
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|
1063 if (result != NULL) { |
|
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diff
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|
1064 return result; |
|
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|
1065 } |
|
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|
1066 |
|
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|
1067 if (GC_locker::is_active_and_needs_gc()) { |
|
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|
1068 should_try_gc = false; |
|
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|
1069 } else { |
|
6106
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|
1070 // The GCLocker may not be active but the GCLocker initiated |
|
1d478c993020
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|
1071 // GC may not yet have been performed (GCLocker::needs_gc() |
|
1d478c993020
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|
1072 // returns true). In this case we do not try this GC and |
|
1d478c993020
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|
1073 // wait until the GCLocker initiated GC is performed, and |
|
1d478c993020
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|
1074 // then retry the allocation. |
|
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|
1075 if (GC_locker::needs_gc()) { |
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1076 should_try_gc = false; |
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1077 } else { |
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1078 // Read the GC count while still holding the Heap_lock. |
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1079 gc_count_before = total_collections(); |
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1080 should_try_gc = true; |
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1081 } |
|
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1082 } |
|
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1083 } |
|
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1084 |
|
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1085 if (should_try_gc) { |
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1086 // If we failed to allocate the humongous object, we should try to |
|
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1087 // do a collection pause (if we're allowed) in case it reclaims |
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1088 // enough space for the allocation to succeed after the pause. |
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1089 |
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1090 bool succeeded; |
|
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1091 result = do_collection_pause(word_size, gc_count_before, &succeeded); |
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1092 if (result != NULL) { |
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1093 assert(succeeded, "only way to get back a non-NULL result"); |
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1094 return result; |
|
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1095 } |
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1096 |
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1097 if (succeeded) { |
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1098 // If we get here we successfully scheduled a collection which |
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1099 // failed to allocate. No point in trying to allocate |
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1100 // further. We'll just return NULL. |
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1101 MutexLockerEx x(Heap_lock); |
|
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1102 *gc_count_before_ret = total_collections(); |
|
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1103 return NULL; |
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1104 } |
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1105 } else { |
|
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1106 // The GCLocker is either active or the GCLocker initiated |
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1107 // GC has not yet been performed. Stall until it is and |
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1108 // then retry the allocation. |
|
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1109 GC_locker::stall_until_clear(); |
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1110 } |
|
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1111 |
|
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1112 // We can reach here if we were unsuccessul in scheduling a |
|
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1113 // collection (because another thread beat us to it) or if we were |
|
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1114 // stalled due to the GC locker. In either can we should retry the |
|
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1115 // allocation attempt in case another thread successfully |
|
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1116 // performed a collection and reclaimed enough space. Give a |
|
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1117 // warning if we seem to be looping forever. |
|
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1118 |
|
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1119 if ((QueuedAllocationWarningCount > 0) && |
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1120 (try_count % QueuedAllocationWarningCount == 0)) { |
|
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1121 warning("G1CollectedHeap::attempt_allocation_humongous() " |
|
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1122 "retries %d times", try_count); |
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1123 } |
|
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1124 } |
|
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1125 |
|
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1126 ShouldNotReachHere(); |
|
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1127 return NULL; |
|
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1128 } |
|
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1129 |
|
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1130 HeapWord* G1CollectedHeap::attempt_allocation_at_safepoint(size_t word_size, |
|
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1131 bool expect_null_mutator_alloc_region) { |
| 2152 | 1132 assert_at_safepoint(true /* should_be_vm_thread */); |
|
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1133 assert(_mutator_alloc_region.get() == NULL || |
|
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1134 !expect_null_mutator_alloc_region, |
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1135 "the current alloc region was unexpectedly found to be non-NULL"); |
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1136 |
|
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1137 if (!isHumongous(word_size)) { |
|
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1138 return _mutator_alloc_region.attempt_allocation_locked(word_size, |
|
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1139 false /* bot_updates */); |
|
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1140 } else { |
|
4829
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1141 HeapWord* result = humongous_obj_allocate(word_size); |
|
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1142 if (result != NULL && g1_policy()->need_to_start_conc_mark("STW humongous allocation")) { |
|
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1143 g1_policy()->set_initiate_conc_mark_if_possible(); |
|
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|
1144 } |
|
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1145 return result; |
|
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|
1146 } |
|
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1147 |
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1148 ShouldNotReachHere(); |
| 342 | 1149 } |
| 1150 | |
| 1151 class PostMCRemSetClearClosure: public HeapRegionClosure { | |
| 1152 ModRefBarrierSet* _mr_bs; | |
| 1153 public: | |
| 1154 PostMCRemSetClearClosure(ModRefBarrierSet* mr_bs) : _mr_bs(mr_bs) {} | |
| 1155 bool doHeapRegion(HeapRegion* r) { | |
| 1156 r->reset_gc_time_stamp(); | |
| 1157 if (r->continuesHumongous()) | |
| 1158 return false; | |
| 1159 HeapRegionRemSet* hrrs = r->rem_set(); | |
| 1160 if (hrrs != NULL) hrrs->clear(); | |
| 1161 // You might think here that we could clear just the cards | |
| 1162 // corresponding to the used region. But no: if we leave a dirty card | |
| 1163 // in a region we might allocate into, then it would prevent that card | |
| 1164 // from being enqueued, and cause it to be missed. | |
| 1165 // Re: the performance cost: we shouldn't be doing full GC anyway! | |
| 1166 _mr_bs->clear(MemRegion(r->bottom(), r->end())); | |
| 1167 return false; | |
| 1168 } | |
| 1169 }; | |
| 1170 | |
| 1171 | |
| 1172 class PostMCRemSetInvalidateClosure: public HeapRegionClosure { | |
| 1173 ModRefBarrierSet* _mr_bs; | |
| 1174 public: | |
| 1175 PostMCRemSetInvalidateClosure(ModRefBarrierSet* mr_bs) : _mr_bs(mr_bs) {} | |
| 1176 bool doHeapRegion(HeapRegion* r) { | |
| 1177 if (r->continuesHumongous()) return false; | |
| 1178 if (r->used_region().word_size() != 0) { | |
| 1179 _mr_bs->invalidate(r->used_region(), true /*whole heap*/); | |
| 1180 } | |
| 1181 return false; | |
| 1182 } | |
| 1183 }; | |
| 1184 | |
|
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1185 class RebuildRSOutOfRegionClosure: public HeapRegionClosure { |
|
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1186 G1CollectedHeap* _g1h; |
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1187 UpdateRSOopClosure _cl; |
|
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1188 int _worker_i; |
|
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1189 public: |
|
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|
1190 RebuildRSOutOfRegionClosure(G1CollectedHeap* g1, int worker_i = 0) : |
| 1861 | 1191 _cl(g1->g1_rem_set(), worker_i), |
|
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1192 _worker_i(worker_i), |
|
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|
1193 _g1h(g1) |
|
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1194 { } |
|
1960
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1195 |
|
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1196 bool doHeapRegion(HeapRegion* r) { |
|
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1197 if (!r->continuesHumongous()) { |
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1198 _cl.set_from(r); |
|
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1199 r->oop_iterate(&_cl); |
|
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1200 } |
|
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1201 return false; |
|
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1202 } |
|
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1203 }; |
|
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1204 |
|
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1205 class ParRebuildRSTask: public AbstractGangTask { |
|
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1206 G1CollectedHeap* _g1; |
|
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1207 public: |
|
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1208 ParRebuildRSTask(G1CollectedHeap* g1) |
|
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1209 : AbstractGangTask("ParRebuildRSTask"), |
|
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1210 _g1(g1) |
|
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1211 { } |
|
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1212 |
|
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1213 void work(uint worker_id) { |
|
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1214 RebuildRSOutOfRegionClosure rebuild_rs(_g1, worker_id); |
|
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1215 _g1->heap_region_par_iterate_chunked(&rebuild_rs, worker_id, |
|
4095
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1216 _g1->workers()->active_workers(), |
|
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1217 HeapRegion::RebuildRSClaimValue); |
|
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1218 } |
|
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1219 }; |
|
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1220 |
|
3778
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1221 class PostCompactionPrinterClosure: public HeapRegionClosure { |
|
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1222 private: |
|
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1223 G1HRPrinter* _hr_printer; |
|
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1224 public: |
|
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|
1225 bool doHeapRegion(HeapRegion* hr) { |
|
5f6f2615433a
7049999: G1: Make the G1PrintHeapRegions output consistent and complete
tonyp
parents:
3777
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changeset
|
1226 assert(!hr->is_young(), "not expecting to find young regions"); |
|
5f6f2615433a
7049999: G1: Make the G1PrintHeapRegions output consistent and complete
tonyp
parents:
3777
diff
changeset
|
1227 // We only generate output for non-empty regions. |
|
5f6f2615433a
7049999: G1: Make the G1PrintHeapRegions output consistent and complete
tonyp
parents:
3777
diff
changeset
|
1228 if (!hr->is_empty()) { |
|
5f6f2615433a
7049999: G1: Make the G1PrintHeapRegions output consistent and complete
tonyp
parents:
3777
diff
changeset
|
1229 if (!hr->isHumongous()) { |
|
5f6f2615433a
7049999: G1: Make the G1PrintHeapRegions output consistent and complete
tonyp
parents:
3777
diff
changeset
|
1230 _hr_printer->post_compaction(hr, G1HRPrinter::Old); |
|
5f6f2615433a
7049999: G1: Make the G1PrintHeapRegions output consistent and complete
tonyp
parents:
3777
diff
changeset
|
1231 } else if (hr->startsHumongous()) { |
|
3986
65a8ff39a6da
7095194: G1: HeapRegion::GrainBytes, GrainWords, and CardsPerRegion should be size_t
johnc
parents:
3983
diff
changeset
|
1232 if (hr->capacity() == HeapRegion::GrainBytes) { |
|
3778
5f6f2615433a
7049999: G1: Make the G1PrintHeapRegions output consistent and complete
tonyp
parents:
3777
diff
changeset
|
1233 // single humongous region |
|
5f6f2615433a
7049999: G1: Make the G1PrintHeapRegions output consistent and complete
tonyp
parents:
3777
diff
changeset
|
1234 _hr_printer->post_compaction(hr, G1HRPrinter::SingleHumongous); |
|
5f6f2615433a
7049999: G1: Make the G1PrintHeapRegions output consistent and complete
tonyp
parents:
3777
diff
changeset
|
1235 } else { |
|
5f6f2615433a
7049999: G1: Make the G1PrintHeapRegions output consistent and complete
tonyp
parents:
3777
diff
changeset
|
1236 _hr_printer->post_compaction(hr, G1HRPrinter::StartsHumongous); |
|
5f6f2615433a
7049999: G1: Make the G1PrintHeapRegions output consistent and complete
tonyp
parents:
3777
diff
changeset
|
1237 } |
|
5f6f2615433a
7049999: G1: Make the G1PrintHeapRegions output consistent and complete
tonyp
parents:
3777
diff
changeset
|
1238 } else { |
|
5f6f2615433a
7049999: G1: Make the G1PrintHeapRegions output consistent and complete
tonyp
parents:
3777
diff
changeset
|
1239 assert(hr->continuesHumongous(), "only way to get here"); |
|
5f6f2615433a
7049999: G1: Make the G1PrintHeapRegions output consistent and complete
tonyp
parents:
3777
diff
changeset
|
1240 _hr_printer->post_compaction(hr, G1HRPrinter::ContinuesHumongous); |
|
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 } |
|
5f6f2615433a
7049999: G1: Make the G1PrintHeapRegions output consistent and complete
tonyp
parents:
3777
diff
changeset
|
1243 return false; |
|
5f6f2615433a
7049999: G1: Make the G1PrintHeapRegions output consistent and complete
tonyp
parents:
3777
diff
changeset
|
1244 } |
|
5f6f2615433a
7049999: G1: Make the G1PrintHeapRegions output consistent and complete
tonyp
parents:
3777
diff
changeset
|
1245 |
|
5f6f2615433a
7049999: G1: Make the G1PrintHeapRegions output consistent and complete
tonyp
parents:
3777
diff
changeset
|
1246 PostCompactionPrinterClosure(G1HRPrinter* hr_printer) |
|
5f6f2615433a
7049999: G1: Make the G1PrintHeapRegions output consistent and complete
tonyp
parents:
3777
diff
changeset
|
1247 : _hr_printer(hr_printer) { } |
|
5f6f2615433a
7049999: G1: Make the G1PrintHeapRegions output consistent and complete
tonyp
parents:
3777
diff
changeset
|
1248 }; |
|
5f6f2615433a
7049999: G1: Make the G1PrintHeapRegions output consistent and complete
tonyp
parents:
3777
diff
changeset
|
1249 |
| 1973 | 1250 bool G1CollectedHeap::do_collection(bool explicit_gc, |
|
1656
4e5661ba9d98
6944166: G1: explicit GCs are not always handled correctly
tonyp
parents:
1611
diff
changeset
|
1251 bool clear_all_soft_refs, |
| 342 | 1252 size_t word_size) { |
| 2152 | 1253 assert_at_safepoint(true /* should_be_vm_thread */); |
| 1254 | |
|
1359
23b1b27ac76c
6909756: G1: guarantee(G1CollectedHeap::heap()->mark_in_progress(),"Precondition.")
tonyp
parents:
1313
diff
changeset
|
1255 if (GC_locker::check_active_before_gc()) { |
| 1973 | 1256 return false; |
|
1359
23b1b27ac76c
6909756: G1: guarantee(G1CollectedHeap::heap()->mark_in_progress(),"Precondition.")
tonyp
parents:
1313
diff
changeset
|
1257 } |
|
23b1b27ac76c
6909756: G1: guarantee(G1CollectedHeap::heap()->mark_in_progress(),"Precondition.")
tonyp
parents:
1313
diff
changeset
|
1258 |
|
2125
7246a374a9f2
6458402: 3 jvmti tests fail with CMS and +ExplicitGCInvokesConcurrent
kamg
parents:
2039
diff
changeset
|
1259 SvcGCMarker sgcm(SvcGCMarker::FULL); |
| 342 | 1260 ResourceMark rm; |
| 1261 | |
|
4872
aa3d708d67c4
7141200: log some interesting information in ring buffers for crashes
never
parents:
4787
diff
changeset
|
1262 print_heap_before_gc(); |
|
838
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
parents:
811
diff
changeset
|
1263 |
| 4072 | 1264 HRSPhaseSetter x(HRSPhaseFullGC); |
| 2152 | 1265 verify_region_sets_optional(); |
| 342 | 1266 |
|
1387
0bfd3fb24150
6858496: Clear all SoftReferences before an out-of-memory due to GC overhead limit.
jmasa
parents:
1360
diff
changeset
|
1267 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
|
1268 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
|
1269 |
|
0bfd3fb24150
6858496: Clear all SoftReferences before an out-of-memory due to GC overhead limit.
jmasa
parents:
1360
diff
changeset
|
1270 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
|
1271 |
| 342 | 1272 { |
| 1273 IsGCActiveMark x; | |
| 1274 | |
| 1275 // Timing | |
| 6030 | 1276 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
|
1277 gclog_or_tty->date_stamp(G1Log::fine() && PrintGCDateStamps); |
|
5c86f8211d1e
7160728: Introduce an extra logging level for G1 logging
brutisso
parents:
5987
diff
changeset
|
1278 TraceCPUTime tcpu(G1Log::finer(), true, gclog_or_tty); |
| 6030 | 1279 |
|
6064
9d679effd28c
7166894: Add gc cause to GC logging for all collectors
brutisso
parents:
6059
diff
changeset
|
1280 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
|
1281 TraceCollectorStats tcs(g1mm()->full_collection_counters()); |
|
3356
78542e2b5e35
7036199: Adding a notification to the implementation of GarbageCollectorMXBeans
fparain
parents:
3323
diff
changeset
|
1282 TraceMemoryManagerStats tms(true /* fullGC */, gc_cause()); |
|
1089
db0d5eba9d20
6815790: G1: Missing MemoryPoolMXBeans with -XX:+UseG1GC
tonyp
parents:
1088
diff
changeset
|
1283 |
| 342 | 1284 double start = os::elapsedTime(); |
| 1285 g1_policy()->record_full_collection_start(); | |
| 1286 | |
|
4837
eff609af17d7
7127706: G1: re-enable survivors during the initial-mark pause
tonyp
parents:
4836
diff
changeset
|
1287 // 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
|
1288 // 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
|
1289 // 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
|
1290 // following two methods. |
| 2152 | 1291 wait_while_free_regions_coming(); |
|
4837
eff609af17d7
7127706: G1: re-enable survivors during the initial-mark pause
tonyp
parents:
4836
diff
changeset
|
1292 // 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
|
1293 // 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
|
1294 // 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
|
1295 // 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
|
1296 // early. |
|
eff609af17d7
7127706: G1: re-enable survivors during the initial-mark pause
tonyp
parents:
4836
diff
changeset
|
1297 _cm->root_regions()->abort(); |
|
eff609af17d7
7127706: G1: re-enable survivors during the initial-mark pause
tonyp
parents:
4836
diff
changeset
|
1298 _cm->root_regions()->wait_until_scan_finished(); |
| 2361 | 1299 append_secondary_free_list_if_not_empty_with_lock(); |
| 2152 | 1300 |
| 342 | 1301 gc_prologue(true); |
|
838
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
parents:
811
diff
changeset
|
1302 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
|
1303 increment_old_marking_cycles_started(); |
| 342 | 1304 |
| 1305 size_t g1h_prev_used = used(); | |
| 1306 assert(used() == recalculate_used(), "Should be equal"); | |
| 1307 | |
| 1308 if (VerifyBeforeGC && total_collections() >= VerifyGCStartAt) { | |
| 1309 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
|
1310 gclog_or_tty->print(" VerifyBeforeGC:"); |
| 342 | 1311 prepare_for_verify(); |
| 6008 | 1312 Universe::verify(/* silent */ false, |
|
3772
6747fd0512e0
7004681: G1: Extend marking verification to Full GCs
johnc
parents:
3766
diff
changeset
|
1313 /* option */ VerifyOption_G1UsePrevMarking); |
|
6747fd0512e0
7004681: G1: Extend marking verification to Full GCs
johnc
parents:
3766
diff
changeset
|
1314 |
| 342 | 1315 } |
|
3869
7f776886a215
6810861: G1: support -XX:+{PrintClassHistogram,HeapDump}{Before,After}FullGC
ysr
parents:
3867
diff
changeset
|
1316 pre_full_gc_dump(); |
| 342 | 1317 |
| 1318 COMPILER2_PRESENT(DerivedPointerTable::clear()); | |
| 1319 | |
|
3979
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
1320 // Disable discovery and empty the discovered lists |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
1321 // for the CM ref processor. |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
1322 ref_processor_cm()->disable_discovery(); |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
1323 ref_processor_cm()->abandon_partial_discovery(); |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
1324 ref_processor_cm()->verify_no_references_recorded(); |
| 342 | 1325 |
| 1326 // 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
|
1327 // 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
|
1328 // wait_until_scan_finished() below. |
| 342 | 1329 concurrent_mark()->abort(); |
| 1330 | |
| 1331 // 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
|
1332 release_mutator_alloc_region(); |
| 636 | 1333 abandon_gc_alloc_regions(); |
| 1861 | 1334 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
|
1335 |
|
3778
5f6f2615433a
7049999: G1: Make the G1PrintHeapRegions output consistent and complete
tonyp
parents:
3777
diff
changeset
|
1336 // 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
|
1337 // 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
|
1338 // before the start GC event. |
|
5f6f2615433a
7049999: G1: Make the G1PrintHeapRegions output consistent and complete
tonyp
parents:
3777
diff
changeset
|
1339 _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
|
1340 |
|
1394
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
1341 // 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
|
1342 // 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
|
1343 // 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
|
1344 // after this full GC. |
|
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
1345 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
|
1346 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
|
1347 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
|
1348 |
| 4072 | 1349 tear_down_region_sets(false /* free_list_only */); |
| 4710 | 1350 g1_policy()->set_gcs_are_young(true); |
| 342 | 1351 |
|
3979
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
1352 // See the comments in g1CollectedHeap.hpp and |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
1353 // G1CollectedHeap::ref_processing_init() about |
|
1974
fd1d227ef1b9
6983204: G1: Nightly test nsk/regression/b4958615 failing with +ExplicitGCInvokesConcurrent
johnc
parents:
1973
diff
changeset
|
1354 // how reference processing currently works in G1. |
|
fd1d227ef1b9
6983204: G1: Nightly test nsk/regression/b4958615 failing with +ExplicitGCInvokesConcurrent
johnc
parents:
1973
diff
changeset
|
1355 |
|
3979
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
1356 // 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
|
1357 ReferenceProcessorMTDiscoveryMutator stw_rp_disc_ser(ref_processor_stw(), false); |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
1358 |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
1359 // 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
|
1360 ReferenceProcessorIsAliveMutator stw_rp_is_alive_null(ref_processor_stw(), NULL); |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
1361 |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
1362 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
|
1363 ref_processor_stw()->setup_policy(do_clear_all_soft_refs); |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
1364 |
| 342 | 1365 // Do collection work |
| 1366 { | |
| 1367 HandleMark hm; // Discard invalid handles created during gc | |
|
3979
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
1368 G1MarkSweep::invoke_at_safepoint(ref_processor_stw(), do_clear_all_soft_refs); |
| 342 | 1369 } |
|
3979
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
1370 |
| 2152 | 1371 assert(free_regions() == 0, "we should not have added any free regions"); |
| 4072 | 1372 rebuild_region_sets(false /* free_list_only */); |
| 342 | 1373 |
|
3979
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
1374 // Enqueue any discovered reference objects that have |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
1375 // not been removed from the discovered lists. |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
1376 ref_processor_stw()->enqueue_discovered_references(); |
| 342 | 1377 |
| 1378 COMPILER2_PRESENT(DerivedPointerTable::update_pointers()); | |
| 1379 | |
|
1089
db0d5eba9d20
6815790: G1: Missing MemoryPoolMXBeans with -XX:+UseG1GC
tonyp
parents:
1088
diff
changeset
|
1380 MemoryService::track_memory_usage(); |
|
db0d5eba9d20
6815790: G1: Missing MemoryPoolMXBeans with -XX:+UseG1GC
tonyp
parents:
1088
diff
changeset
|
1381 |
| 342 | 1382 if (VerifyAfterGC && total_collections() >= VerifyGCStartAt) { |
| 1383 HandleMark hm; // Discard invalid handles created during verification | |
| 1384 gclog_or_tty->print(" VerifyAfterGC:"); | |
|
637
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|
1385 prepare_for_verify(); |
| 6008 | 1386 Universe::verify(/* silent */ false, |
|
3772
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|
1387 /* option */ VerifyOption_G1UsePrevMarking); |
|
6747fd0512e0
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|
1388 |
| 342 | 1389 } |
|
3979
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|
1390 |
|
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|
1391 assert(!ref_processor_stw()->discovery_enabled(), "Postcondition"); |
|
4dfb2df418f2
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|
1392 ref_processor_stw()->verify_no_references_recorded(); |
|
4dfb2df418f2
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|
1393 |
|
4dfb2df418f2
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|
1394 // Note: since we've just done a full GC, concurrent |
|
4dfb2df418f2
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|
1395 // marking is no longer active. Therefore we need not |
|
4dfb2df418f2
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|
1396 // re-enable reference discovery for the CM ref processor. |
|
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6484982: G1: process references during evacuation pauses
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|
1397 // That will be done at the start of the next marking cycle. |
|
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6484982: G1: process references during evacuation pauses
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|
1398 assert(!ref_processor_cm()->discovery_enabled(), "Postcondition"); |
|
4dfb2df418f2
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|
1399 ref_processor_cm()->verify_no_references_recorded(); |
| 342 | 1400 |
| 1401 reset_gc_time_stamp(); | |
| 1402 // Since everything potentially moved, we will clear all remembered | |
|
626
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|
1403 // sets, and clear all cards. Later we will rebuild remebered |
|
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|
1404 // sets. We will also reset the GC time stamps of the regions. |
| 342 | 1405 PostMCRemSetClearClosure rs_clear(mr_bs()); |
| 1406 heap_region_iterate(&rs_clear); | |
| 1407 | |
| 1408 // Resize the heap if necessary. | |
|
1656
4e5661ba9d98
6944166: G1: explicit GCs are not always handled correctly
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|
1409 resize_if_necessary_after_full_collection(explicit_gc ? 0 : word_size); |
| 342 | 1410 |
|
3778
5f6f2615433a
7049999: G1: Make the G1PrintHeapRegions output consistent and complete
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|
1411 if (_hr_printer.is_active()) { |
|
5f6f2615433a
7049999: G1: Make the G1PrintHeapRegions output consistent and complete
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changeset
|
1412 // 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
|
1413 // that all the COMMIT / UNCOMMIT events are generated before |
|
5f6f2615433a
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|
1414 // the end GC event. |
|
5f6f2615433a
7049999: G1: Make the G1PrintHeapRegions output consistent and complete
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|
1415 |
|
5f6f2615433a
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|
1416 PostCompactionPrinterClosure cl(hr_printer()); |
|
5f6f2615433a
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|
1417 heap_region_iterate(&cl); |
|
5f6f2615433a
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|
1418 |
|
5f6f2615433a
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|
1419 _hr_printer.end_gc(true /* full */, (size_t) total_collections()); |
|
5f6f2615433a
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|
1420 } |
|
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changeset
|
1421 |
| 342 | 1422 if (_cg1r->use_cache()) { |
| 1423 _cg1r->clear_and_record_card_counts(); | |
| 1424 _cg1r->clear_hot_cache(); | |
| 1425 } | |
| 1426 | |
|
626
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6760309: G1: update remembered sets during Full GCs
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|
1427 // Rebuild remembered sets of all regions. |
|
1833
8b10f48633dc
6984287: Regularize how GC parallel workers are specified.
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1755
diff
changeset
|
1428 if (G1CollectedHeap::use_parallel_gc_threads()) { |
|
4728
441e946dc1af
7121618: Change type of number of GC workers to unsigned int.
jmasa
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diff
changeset
|
1429 uint n_workers = |
|
4095
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|
1430 AdaptiveSizePolicy::calc_active_workers(workers()->total_workers(), |
|
bca17e38de00
6593758: RFE: Enhance GC ergonomics to dynamically choose ParallelGCThreads
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|
1431 workers()->active_workers(), |
|
bca17e38de00
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changeset
|
1432 Threads::number_of_non_daemon_threads()); |
|
bca17e38de00
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parents:
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|
1433 assert(UseDynamicNumberOfGCThreads || |
|
bca17e38de00
6593758: RFE: Enhance GC ergonomics to dynamically choose ParallelGCThreads
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|
1434 n_workers == workers()->total_workers(), |
|
bca17e38de00
6593758: RFE: Enhance GC ergonomics to dynamically choose ParallelGCThreads
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|
1435 "If not dynamic should be using all the workers"); |
|
bca17e38de00
6593758: RFE: Enhance GC ergonomics to dynamically choose ParallelGCThreads
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changeset
|
1436 workers()->set_active_workers(n_workers); |
|
bca17e38de00
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4090
diff
changeset
|
1437 // Set parallel threads in the heap (_n_par_threads) only |
|
bca17e38de00
6593758: RFE: Enhance GC ergonomics to dynamically choose ParallelGCThreads
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|
1438 // before a parallel phase and always reset it to 0 after |
|
bca17e38de00
6593758: RFE: Enhance GC ergonomics to dynamically choose ParallelGCThreads
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|
1439 // the phase so that the number of parallel threads does |
|
bca17e38de00
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|
1440 // no get carried forward to a serial phase where there |
|
bca17e38de00
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|
1441 // may be code that is "possibly_parallel". |
|
bca17e38de00
6593758: RFE: Enhance GC ergonomics to dynamically choose ParallelGCThreads
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|
1442 set_par_threads(n_workers); |
|
bca17e38de00
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|
1443 |
|
626
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|
1444 ParRebuildRSTask rebuild_rs_task(this); |
|
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|
1445 assert(check_heap_region_claim_values( |
|
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|
1446 HeapRegion::InitialClaimValue), "sanity check"); |
|
4095
bca17e38de00
6593758: RFE: Enhance GC ergonomics to dynamically choose ParallelGCThreads
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|
1447 assert(UseDynamicNumberOfGCThreads || |
|
bca17e38de00
6593758: RFE: Enhance GC ergonomics to dynamically choose ParallelGCThreads
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changeset
|
1448 workers()->active_workers() == workers()->total_workers(), |
|
bca17e38de00
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diff
changeset
|
1449 "Unless dynamic should use total workers"); |
|
bca17e38de00
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changeset
|
1450 // Use the most recent number of active workers |
|
bca17e38de00
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diff
changeset
|
1451 assert(workers()->active_workers() > 0, |
|
bca17e38de00
6593758: RFE: Enhance GC ergonomics to dynamically choose ParallelGCThreads
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changeset
|
1452 "Active workers not properly set"); |
|
bca17e38de00
6593758: RFE: Enhance GC ergonomics to dynamically choose ParallelGCThreads
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diff
changeset
|
1453 set_par_threads(workers()->active_workers()); |
|
626
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6760309: G1: update remembered sets during Full GCs
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diff
changeset
|
1454 workers()->run_task(&rebuild_rs_task); |
|
87fa6e083d82
6760309: G1: update remembered sets during Full GCs
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parents:
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diff
changeset
|
1455 set_par_threads(0); |
|
87fa6e083d82
6760309: G1: update remembered sets during Full GCs
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parents:
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diff
changeset
|
1456 assert(check_heap_region_claim_values( |
|
87fa6e083d82
6760309: G1: update remembered sets during Full GCs
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changeset
|
1457 HeapRegion::RebuildRSClaimValue), "sanity check"); |
|
87fa6e083d82
6760309: G1: update remembered sets during Full GCs
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|
1458 reset_heap_region_claim_values(); |
|
87fa6e083d82
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changeset
|
1459 } else { |
|
87fa6e083d82
6760309: G1: update remembered sets during Full GCs
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diff
changeset
|
1460 RebuildRSOutOfRegionClosure rebuild_rs(this); |
|
87fa6e083d82
6760309: G1: update remembered sets during Full GCs
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diff
changeset
|
1461 heap_region_iterate(&rebuild_rs); |
|
87fa6e083d82
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diff
changeset
|
1462 } |
|
87fa6e083d82
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diff
changeset
|
1463 |
|
6007
5c86f8211d1e
7160728: Introduce an extra logging level for G1 logging
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parents:
5987
diff
changeset
|
1464 if (G1Log::fine()) { |
| 342 | 1465 print_size_transition(gclog_or_tty, g1h_prev_used, used(), capacity()); |
| 1466 } | |
| 1467 | |
| 1468 if (true) { // FIXME | |
| 1469 // Ask the permanent generation to adjust size for full collections | |
| 1470 perm()->compute_new_size(); | |
| 1471 } | |
| 1472 | |
|
1394
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
1473 // 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
|
1474 assert(g1_policy()->collection_set() == NULL, "must be"); |
|
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
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diff
changeset
|
1475 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
|
1476 |
|
1316cec51b4d
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johnc
parents:
1391
diff
changeset
|
1477 // 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
johnc
parents:
1391
diff
changeset
|
1478 // regions to the incremental collection set for the next |
|
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
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diff
changeset
|
1479 // evacuation pause. |
|
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
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parents:
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diff
changeset
|
1480 clear_cset_fast_test(); |
|
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
1481 |
|
2433
abdfc822206f
7023069: G1: Introduce symmetric locking in the slow allocation path
tonyp
parents:
2432
diff
changeset
|
1482 init_mutator_alloc_region(); |
|
abdfc822206f
7023069: G1: Introduce symmetric locking in the slow allocation path
tonyp
parents:
2432
diff
changeset
|
1483 |
| 342 | 1484 double end = os::elapsedTime(); |
| 1485 g1_policy()->record_full_collection_end(); | |
| 1486 | |
|
546
05c6d52fa7a9
6690928: Use spinning in combination with yields for workstealing termination.
jmasa
parents:
545
diff
changeset
|
1487 #ifdef TRACESPINNING |
|
05c6d52fa7a9
6690928: Use spinning in combination with yields for workstealing termination.
jmasa
parents:
545
diff
changeset
|
1488 ParallelTaskTerminator::print_termination_counts(); |
|
05c6d52fa7a9
6690928: Use spinning in combination with yields for workstealing termination.
jmasa
parents:
545
diff
changeset
|
1489 #endif |
|
05c6d52fa7a9
6690928: Use spinning in combination with yields for workstealing termination.
jmasa
parents:
545
diff
changeset
|
1490 |
| 342 | 1491 gc_epilogue(true); |
| 1492 | |
| 794 | 1493 // Discard all rset updates |
| 1494 JavaThread::dirty_card_queue_set().abandon_logs(); | |
|
616
4f360ec815ba
6720309: G1: don't synchronously update RSet during evacuation pauses
iveresov
parents:
595
diff
changeset
|
1495 assert(!G1DeferredRSUpdate |
|
4f360ec815ba
6720309: G1: don't synchronously update RSet during evacuation pauses
iveresov
parents:
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diff
changeset
|
1496 || (G1DeferredRSUpdate && (dirty_card_queue_set().completed_buffers_num() == 0)), "Should not be any"); |
|
6121
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|
1497 |
|
b9442ac22f59
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changeset
|
1498 _young_list->reset_sampled_info(); |
|
b9442ac22f59
7173460: G1: java/lang/management/MemoryMXBean/CollectionUsageThreshold.java failes with G1
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|
1499 // At this point there should be no regions in the |
|
b9442ac22f59
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|
1500 // entire heap tagged as young. |
|
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diff
changeset
|
1501 assert( check_young_list_empty(true /* check_heap */), |
|
b9442ac22f59
7173460: G1: java/lang/management/MemoryMXBean/CollectionUsageThreshold.java failes with G1
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diff
changeset
|
1502 "young list should be empty at this point"); |
|
b9442ac22f59
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|
1503 |
|
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diff
changeset
|
1504 // Update the number of full collections that have been completed. |
|
b9442ac22f59
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changeset
|
1505 increment_old_marking_cycles_completed(false /* concurrent */); |
|
b9442ac22f59
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|
1506 |
|
b9442ac22f59
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changeset
|
1507 _hrs.verify_optional(); |
|
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changeset
|
1508 verify_region_sets_optional(); |
|
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|
1509 |
|
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changeset
|
1510 print_heap_after_gc(); |
|
b9442ac22f59
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|
1511 |
|
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changeset
|
1512 // We must call G1MonitoringSupport::update_sizes() in the same scoping level |
|
b9442ac22f59
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|
1513 // as an active TraceMemoryManagerStats object (i.e. before the destructor for the |
|
b9442ac22f59
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changeset
|
1514 // TraceMemoryManagerStats is called) so that the G1 memory pools are updated |
|
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|
1515 // before any GC notifications are raised. |
|
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|
1516 g1mm()->update_sizes(); |
|
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|
1517 } |
|
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|
1518 |
|
3869
7f776886a215
6810861: G1: support -XX:+{PrintClassHistogram,HeapDump}{Before,After}FullGC
ysr
parents:
3867
diff
changeset
|
1519 post_full_gc_dump(); |
| 1973 | 1520 |
| 1521 return true; | |
| 342 | 1522 } |
| 1523 | |
| 1524 void G1CollectedHeap::do_full_collection(bool clear_all_soft_refs) { | |
| 1973 | 1525 // do_collection() will return whether it succeeded in performing |
| 1526 // the GC. Currently, there is no facility on the | |
| 1527 // do_full_collection() API to notify the caller than the collection | |
| 1528 // did not succeed (e.g., because it was locked out by the GC | |
| 1529 // locker). So, right now, we'll ignore the return value. | |
| 1530 bool dummy = do_collection(true, /* explicit_gc */ | |
| 1531 clear_all_soft_refs, | |
| 1532 0 /* word_size */); | |
| 342 | 1533 } |
| 1534 | |
| 1535 // This code is mostly copied from TenuredGeneration. | |
| 1536 void | |
| 1537 G1CollectedHeap:: | |
| 1538 resize_if_necessary_after_full_collection(size_t word_size) { | |
| 1539 assert(MinHeapFreeRatio <= MaxHeapFreeRatio, "sanity check"); | |
| 1540 | |
| 1541 // Include the current allocation, if any, and bytes that will be | |
| 1542 // pre-allocated to support collections, as "used". | |
| 1543 const size_t used_after_gc = used(); | |
| 1544 const size_t capacity_after_gc = capacity(); | |
| 1545 const size_t free_after_gc = capacity_after_gc - used_after_gc; | |
| 1546 | |
|
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1547 // This is enforced in arguments.cpp. |
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1548 assert(MinHeapFreeRatio <= MaxHeapFreeRatio, |
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1549 "otherwise the code below doesn't make sense"); |
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1550 |
| 342 | 1551 // We don't have floating point command-line arguments |
|
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1552 const double minimum_free_percentage = (double) MinHeapFreeRatio / 100.0; |
| 342 | 1553 const double maximum_used_percentage = 1.0 - minimum_free_percentage; |
|
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1554 const double maximum_free_percentage = (double) MaxHeapFreeRatio / 100.0; |
| 342 | 1555 const double minimum_used_percentage = 1.0 - maximum_free_percentage; |
| 1556 | |
|
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1557 const size_t min_heap_size = collector_policy()->min_heap_byte_size(); |
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1558 const size_t max_heap_size = collector_policy()->max_heap_byte_size(); |
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1559 |
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1560 // We have to be careful here as these two calculations can overflow |
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1561 // 32-bit size_t's. |
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1562 double used_after_gc_d = (double) used_after_gc; |
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1563 double minimum_desired_capacity_d = used_after_gc_d / maximum_used_percentage; |
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1564 double maximum_desired_capacity_d = used_after_gc_d / minimum_used_percentage; |
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1565 |
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1566 // Let's make sure that they are both under the max heap size, which |
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1567 // by default will make them fit into a size_t. |
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1568 double desired_capacity_upper_bound = (double) max_heap_size; |
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1569 minimum_desired_capacity_d = MIN2(minimum_desired_capacity_d, |
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1570 desired_capacity_upper_bound); |
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1571 maximum_desired_capacity_d = MIN2(maximum_desired_capacity_d, |
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1572 desired_capacity_upper_bound); |
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1573 |
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1574 // We can now safely turn them into size_t's. |
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1575 size_t minimum_desired_capacity = (size_t) minimum_desired_capacity_d; |
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1576 size_t maximum_desired_capacity = (size_t) maximum_desired_capacity_d; |
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1577 |
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1578 // This assert only makes sense here, before we adjust them |
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1579 // with respect to the min and max heap size. |
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1580 assert(minimum_desired_capacity <= maximum_desired_capacity, |
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1581 err_msg("minimum_desired_capacity = "SIZE_FORMAT", " |
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1582 "maximum_desired_capacity = "SIZE_FORMAT, |
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1583 minimum_desired_capacity, maximum_desired_capacity)); |
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1584 |
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1585 // Should not be greater than the heap max size. No need to adjust |
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1586 // it with respect to the heap min size as it's a lower bound (i.e., |
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1587 // we'll try to make the capacity larger than it, not smaller). |
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1588 minimum_desired_capacity = MIN2(minimum_desired_capacity, max_heap_size); |
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1589 // Should not be less than the heap min size. No need to adjust it |
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1590 // with respect to the heap max size as it's an upper bound (i.e., |
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1591 // we'll try to make the capacity smaller than it, not greater). |
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1592 maximum_desired_capacity = MAX2(maximum_desired_capacity, min_heap_size); |
| 342 | 1593 |
|
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1594 if (capacity_after_gc < minimum_desired_capacity) { |
| 342 | 1595 // Don't expand unless it's significant |
| 1596 size_t expand_bytes = minimum_desired_capacity - capacity_after_gc; | |
|
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1597 ergo_verbose4(ErgoHeapSizing, |
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1598 "attempt heap expansion", |
|
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1599 ergo_format_reason("capacity lower than " |
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1600 "min desired capacity after Full GC") |
|
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1601 ergo_format_byte("capacity") |
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1602 ergo_format_byte("occupancy") |
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1603 ergo_format_byte_perc("min desired capacity"), |
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1604 capacity_after_gc, used_after_gc, |
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1605 minimum_desired_capacity, (double) MinHeapFreeRatio); |
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|
1606 expand(expand_bytes); |
| 342 | 1607 |
| 1608 // No expansion, now see if we want to shrink | |
|
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|
1609 } else if (capacity_after_gc > maximum_desired_capacity) { |
| 342 | 1610 // Capacity too large, compute shrinking size |
| 1611 size_t shrink_bytes = capacity_after_gc - maximum_desired_capacity; | |
|
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1612 ergo_verbose4(ErgoHeapSizing, |
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1613 "attempt heap shrinking", |
|
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|
1614 ergo_format_reason("capacity higher than " |
|
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|
1615 "max desired capacity after Full GC") |
|
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|
1616 ergo_format_byte("capacity") |
|
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|
1617 ergo_format_byte("occupancy") |
|
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|
1618 ergo_format_byte_perc("max desired capacity"), |
|
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|
1619 capacity_after_gc, used_after_gc, |
|
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|
1620 maximum_desired_capacity, (double) MaxHeapFreeRatio); |
| 342 | 1621 shrink(shrink_bytes); |
| 1622 } | |
| 1623 } | |
| 1624 | |
| 1625 | |
| 1626 HeapWord* | |
| 1973 | 1627 G1CollectedHeap::satisfy_failed_allocation(size_t word_size, |
| 1628 bool* succeeded) { | |
| 2152 | 1629 assert_at_safepoint(true /* should_be_vm_thread */); |
| 1973 | 1630 |
| 1631 *succeeded = true; | |
| 1632 // Let's attempt the allocation first. | |
|
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|
1633 HeapWord* result = |
|
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|
1634 attempt_allocation_at_safepoint(word_size, |
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|
1635 false /* expect_null_mutator_alloc_region */); |
| 1973 | 1636 if (result != NULL) { |
| 1637 assert(*succeeded, "sanity"); | |
| 1638 return result; | |
| 1639 } | |
| 342 | 1640 |
| 1641 // In a G1 heap, we're supposed to keep allocation from failing by | |
| 1642 // incremental pauses. Therefore, at least for now, we'll favor | |
| 1643 // expansion over collection. (This might change in the future if we can | |
| 1644 // do something smarter than full collection to satisfy a failed alloc.) | |
| 1645 result = expand_and_allocate(word_size); | |
| 1646 if (result != NULL) { | |
| 1973 | 1647 assert(*succeeded, "sanity"); |
| 342 | 1648 return result; |
| 1649 } | |
| 1650 | |
| 1973 | 1651 // Expansion didn't work, we'll try to do a Full GC. |
| 1652 bool gc_succeeded = do_collection(false, /* explicit_gc */ | |
| 1653 false, /* clear_all_soft_refs */ | |
| 1654 word_size); | |
| 1655 if (!gc_succeeded) { | |
| 1656 *succeeded = false; | |
| 1657 return NULL; | |
| 1658 } | |
| 1659 | |
| 1660 // Retry the allocation | |
| 1661 result = attempt_allocation_at_safepoint(word_size, | |
|
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|
1662 true /* expect_null_mutator_alloc_region */); |
| 342 | 1663 if (result != NULL) { |
| 1973 | 1664 assert(*succeeded, "sanity"); |
| 342 | 1665 return result; |
| 1666 } | |
| 1667 | |
| 1973 | 1668 // Then, try a Full GC that will collect all soft references. |
| 1669 gc_succeeded = do_collection(false, /* explicit_gc */ | |
| 1670 true, /* clear_all_soft_refs */ | |
| 1671 word_size); | |
| 1672 if (!gc_succeeded) { | |
| 1673 *succeeded = false; | |
| 1674 return NULL; | |
| 1675 } | |
| 1676 | |
| 1677 // Retry the allocation once more | |
| 1678 result = attempt_allocation_at_safepoint(word_size, | |
|
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|
1679 true /* expect_null_mutator_alloc_region */); |
| 342 | 1680 if (result != NULL) { |
| 1973 | 1681 assert(*succeeded, "sanity"); |
| 342 | 1682 return result; |
| 1683 } | |
| 1684 | |
|
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|
1685 assert(!collector_policy()->should_clear_all_soft_refs(), |
| 1973 | 1686 "Flag should have been handled and cleared prior to this point"); |
|
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|
1687 |
| 342 | 1688 // What else? We might try synchronous finalization later. If the total |
| 1689 // space available is large enough for the allocation, then a more | |
| 1690 // complete compaction phase than we've tried so far might be | |
| 1691 // appropriate. | |
| 1973 | 1692 assert(*succeeded, "sanity"); |
| 342 | 1693 return NULL; |
| 1694 } | |
| 1695 | |
| 1696 // Attempting to expand the heap sufficiently | |
| 1697 // to support an allocation of the given "word_size". If | |
| 1698 // successful, perform the allocation and return the address of the | |
| 1699 // allocated block, or else "NULL". | |
| 1700 | |
| 1701 HeapWord* G1CollectedHeap::expand_and_allocate(size_t word_size) { | |
| 2152 | 1702 assert_at_safepoint(true /* should_be_vm_thread */); |
| 1703 | |
| 1704 verify_region_sets_optional(); | |
| 1973 | 1705 |
|
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|
1706 size_t expand_bytes = MAX2(word_size * HeapWordSize, MinHeapDeltaBytes); |
|
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1707 ergo_verbose1(ErgoHeapSizing, |
|
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1708 "attempt heap expansion", |
|
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|
1709 ergo_format_reason("allocation request failed") |
|
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|
1710 ergo_format_byte("allocation request"), |
|
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|
1711 word_size * HeapWordSize); |
|
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1712 if (expand(expand_bytes)) { |
| 3766 | 1713 _hrs.verify_optional(); |
|
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|
1714 verify_region_sets_optional(); |
|
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|
1715 return attempt_allocation_at_safepoint(word_size, |
|
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1716 false /* expect_null_mutator_alloc_region */); |
|
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|
1717 } |
|
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1718 return NULL; |
| 342 | 1719 } |
| 1720 | |
| 3766 | 1721 void G1CollectedHeap::update_committed_space(HeapWord* old_end, |
| 1722 HeapWord* new_end) { | |
| 1723 assert(old_end != new_end, "don't call this otherwise"); | |
| 1724 assert((HeapWord*) _g1_storage.high() == new_end, "invariant"); | |
| 1725 | |
| 1726 // Update the committed mem region. | |
| 1727 _g1_committed.set_end(new_end); | |
| 1728 // Tell the card table about the update. | |
| 1729 Universe::heap()->barrier_set()->resize_covered_region(_g1_committed); | |
| 1730 // Tell the BOT about the update. | |
| 1731 _bot_shared->resize(_g1_committed.word_size()); | |
| 1732 } | |
| 1733 | |
|
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1734 bool G1CollectedHeap::expand(size_t expand_bytes) { |
| 342 | 1735 size_t old_mem_size = _g1_storage.committed_size(); |
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1736 size_t aligned_expand_bytes = ReservedSpace::page_align_size_up(expand_bytes); |
| 342 | 1737 aligned_expand_bytes = align_size_up(aligned_expand_bytes, |
| 1738 HeapRegion::GrainBytes); | |
|
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1739 ergo_verbose2(ErgoHeapSizing, |
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1740 "expand the heap", |
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1741 ergo_format_byte("requested expansion amount") |
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1742 ergo_format_byte("attempted expansion amount"), |
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1743 expand_bytes, aligned_expand_bytes); |
|
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1744 |
| 3766 | 1745 // First commit the memory. |
| 1746 HeapWord* old_end = (HeapWord*) _g1_storage.high(); | |
|
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1747 bool successful = _g1_storage.expand_by(aligned_expand_bytes); |
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1748 if (successful) { |
| 3766 | 1749 // Then propagate this update to the necessary data structures. |
| 1750 HeapWord* new_end = (HeapWord*) _g1_storage.high(); | |
| 1751 update_committed_space(old_end, new_end); | |
| 1752 | |
| 1753 FreeRegionList expansion_list("Local Expansion List"); | |
| 1754 MemRegion mr = _hrs.expand_by(old_end, new_end, &expansion_list); | |
| 1755 assert(mr.start() == old_end, "post-condition"); | |
| 1756 // mr might be a smaller region than what was requested if | |
| 1757 // expand_by() was unable to allocate the HeapRegion instances | |
| 1758 assert(mr.end() <= new_end, "post-condition"); | |
| 1759 | |
| 1760 size_t actual_expand_bytes = mr.byte_size(); | |
| 1761 assert(actual_expand_bytes <= aligned_expand_bytes, "post-condition"); | |
| 1762 assert(actual_expand_bytes == expansion_list.total_capacity_bytes(), | |
| 1763 "post-condition"); | |
| 1764 if (actual_expand_bytes < aligned_expand_bytes) { | |
| 1765 // We could not expand _hrs to the desired size. In this case we | |
| 1766 // need to shrink the committed space accordingly. | |
| 1767 assert(mr.end() < new_end, "invariant"); | |
| 1768 | |
| 1769 size_t diff_bytes = aligned_expand_bytes - actual_expand_bytes; | |
| 1770 // First uncommit the memory. | |
| 1771 _g1_storage.shrink_by(diff_bytes); | |
| 1772 // Then propagate this update to the necessary data structures. | |
| 1773 update_committed_space(new_end, mr.end()); | |
|
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1774 } |
| 3766 | 1775 _free_list.add_as_tail(&expansion_list); |
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1776 |
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1777 if (_hr_printer.is_active()) { |
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1778 HeapWord* curr = mr.start(); |
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1779 while (curr < mr.end()) { |
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1780 HeapWord* curr_end = curr + HeapRegion::GrainWords; |
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1781 _hr_printer.commit(curr, curr_end); |
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1782 curr = curr_end; |
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1783 } |
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1784 assert(curr == mr.end(), "post-condition"); |
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1785 } |
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1786 g1_policy()->record_new_heap_size(n_regions()); |
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1787 } else { |
|
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1788 ergo_verbose0(ErgoHeapSizing, |
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1789 "did not expand the heap", |
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1790 ergo_format_reason("heap expansion operation failed")); |
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1791 // The expansion of the virtual storage space was unsuccessful. |
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1792 // Let's see if it was because we ran out of swap. |
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1793 if (G1ExitOnExpansionFailure && |
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1794 _g1_storage.uncommitted_size() >= aligned_expand_bytes) { |
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1795 // We had head room... |
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1796 vm_exit_out_of_memory(aligned_expand_bytes, "G1 heap expansion"); |
| 342 | 1797 } |
| 1798 } | |
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1799 return successful; |
| 342 | 1800 } |
| 1801 | |
| 3766 | 1802 void G1CollectedHeap::shrink_helper(size_t shrink_bytes) { |
| 342 | 1803 size_t old_mem_size = _g1_storage.committed_size(); |
| 1804 size_t aligned_shrink_bytes = | |
| 1805 ReservedSpace::page_align_size_down(shrink_bytes); | |
| 1806 aligned_shrink_bytes = align_size_down(aligned_shrink_bytes, | |
| 1807 HeapRegion::GrainBytes); | |
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1808 uint num_regions_deleted = 0; |
| 3766 | 1809 MemRegion mr = _hrs.shrink_by(aligned_shrink_bytes, &num_regions_deleted); |
| 1810 HeapWord* old_end = (HeapWord*) _g1_storage.high(); | |
| 1811 assert(mr.end() == old_end, "post-condition"); | |
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1812 |
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1813 ergo_verbose3(ErgoHeapSizing, |
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1814 "shrink the heap", |
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1815 ergo_format_byte("requested shrinking amount") |
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1816 ergo_format_byte("aligned shrinking amount") |
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1817 ergo_format_byte("attempted shrinking amount"), |
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1818 shrink_bytes, aligned_shrink_bytes, mr.byte_size()); |
| 3766 | 1819 if (mr.byte_size() > 0) { |
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1820 if (_hr_printer.is_active()) { |
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1821 HeapWord* curr = mr.end(); |
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1822 while (curr > mr.start()) { |
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1823 HeapWord* curr_end = curr; |
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1824 curr -= HeapRegion::GrainWords; |
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1825 _hr_printer.uncommit(curr, curr_end); |
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1826 } |
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1827 assert(curr == mr.start(), "post-condition"); |
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1828 } |
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1829 |
| 342 | 1830 _g1_storage.shrink_by(mr.byte_size()); |
| 3766 | 1831 HeapWord* new_end = (HeapWord*) _g1_storage.high(); |
| 1832 assert(mr.start() == new_end, "post-condition"); | |
| 1833 | |
| 1834 _expansion_regions += num_regions_deleted; | |
| 1835 update_committed_space(old_end, new_end); | |
| 1836 HeapRegionRemSet::shrink_heap(n_regions()); | |
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1837 g1_policy()->record_new_heap_size(n_regions()); |
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1838 } else { |
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1839 ergo_verbose0(ErgoHeapSizing, |
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1840 "did not shrink the heap", |
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1841 ergo_format_reason("heap shrinking operation failed")); |
| 342 | 1842 } |
| 1843 } | |
| 1844 | |
| 1845 void G1CollectedHeap::shrink(size_t shrink_bytes) { | |
| 2152 | 1846 verify_region_sets_optional(); |
| 1847 | |
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1848 // We should only reach here at the end of a Full GC which means we |
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1849 // should not not be holding to any GC alloc regions. The method |
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1850 // below will make sure of that and do any remaining clean up. |
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1851 abandon_gc_alloc_regions(); |
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1852 |
| 2152 | 1853 // Instead of tearing down / rebuilding the free lists here, we |
| 1854 // could instead use the remove_all_pending() method on free_list to | |
| 1855 // remove only the ones that we need to remove. | |
| 4072 | 1856 tear_down_region_sets(true /* free_list_only */); |
| 342 | 1857 shrink_helper(shrink_bytes); |
| 4072 | 1858 rebuild_region_sets(true /* free_list_only */); |
| 2152 | 1859 |
| 3766 | 1860 _hrs.verify_optional(); |
| 2152 | 1861 verify_region_sets_optional(); |
| 342 | 1862 } |
| 1863 | |
| 1864 // Public methods. | |
| 1865 | |
| 1866 #ifdef _MSC_VER // the use of 'this' below gets a warning, make it go away | |
| 1867 #pragma warning( disable:4355 ) // 'this' : used in base member initializer list | |
| 1868 #endif // _MSC_VER | |
| 1869 | |
| 1870 | |
| 1871 G1CollectedHeap::G1CollectedHeap(G1CollectorPolicy* policy_) : | |
| 1872 SharedHeap(policy_), | |
| 1873 _g1_policy(policy_), | |
| 1111 | 1874 _dirty_card_queue_set(false), |
| 1705 | 1875 _into_cset_dirty_card_queue_set(false), |
|
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1876 _is_alive_closure_cm(this), |
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1877 _is_alive_closure_stw(this), |
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1878 _ref_processor_cm(NULL), |
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1879 _ref_processor_stw(NULL), |
| 342 | 1880 _process_strong_tasks(new SubTasksDone(G1H_PS_NumElements)), |
| 1881 _bot_shared(NULL), | |
| 1882 _objs_with_preserved_marks(NULL), _preserved_marks_of_objs(NULL), | |
| 1883 _evac_failure_scan_stack(NULL) , | |
| 1884 _mark_in_progress(false), | |
| 2152 | 1885 _cg1r(NULL), _summary_bytes_used(0), |
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1886 _g1mm(NULL), |
| 342 | 1887 _refine_cte_cl(NULL), |
| 1888 _full_collection(false), | |
| 2152 | 1889 _free_list("Master Free List"), |
| 1890 _secondary_free_list("Secondary Free List"), | |
| 4072 | 1891 _old_set("Old Set"), |
| 2152 | 1892 _humongous_set("Master Humongous Set"), |
| 1893 _free_regions_coming(false), | |
| 342 | 1894 _young_list(new YoungList(this)), |
| 1895 _gc_time_stamp(0), | |
|
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1896 _retained_old_gc_alloc_region(NULL), |
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1897 _expand_heap_after_alloc_failure(true), |
| 526 | 1898 _surviving_young_words(NULL), |
|
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1899 _old_marking_cycles_started(0), |
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1900 _old_marking_cycles_completed(0), |
| 526 | 1901 _in_cset_fast_test(NULL), |
|
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1902 _in_cset_fast_test_base(NULL), |
|
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1903 _dirty_cards_region_list(NULL), |
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1904 _worker_cset_start_region(NULL), |
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1905 _worker_cset_start_region_time_stamp(NULL) { |
| 342 | 1906 _g1h = this; // To catch bugs. |
| 1907 if (_process_strong_tasks == NULL || !_process_strong_tasks->valid()) { | |
| 1908 vm_exit_during_initialization("Failed necessary allocation."); | |
| 1909 } | |
|
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1910 |
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1911 _humongous_object_threshold_in_words = HeapRegion::GrainWords / 2; |
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1912 |
| 342 | 1913 int n_queues = MAX2((int)ParallelGCThreads, 1); |
| 1914 _task_queues = new RefToScanQueueSet(n_queues); | |
| 1915 | |
| 1916 int n_rem_sets = HeapRegionRemSet::num_par_rem_sets(); | |
| 1917 assert(n_rem_sets > 0, "Invariant."); | |
| 1918 | |
| 1919 HeapRegionRemSetIterator** iter_arr = | |
| 1920 NEW_C_HEAP_ARRAY(HeapRegionRemSetIterator*, n_queues); | |
| 1921 for (int i = 0; i < n_queues; i++) { | |
| 1922 iter_arr[i] = new HeapRegionRemSetIterator(); | |
| 1923 } | |
| 1924 _rem_set_iterator = iter_arr; | |
| 1925 | |
|
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1926 _worker_cset_start_region = NEW_C_HEAP_ARRAY(HeapRegion*, n_queues); |
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1927 _worker_cset_start_region_time_stamp = NEW_C_HEAP_ARRAY(unsigned int, n_queues); |
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1928 |
| 342 | 1929 for (int i = 0; i < n_queues; i++) { |
| 1930 RefToScanQueue* q = new RefToScanQueue(); | |
| 1931 q->initialize(); | |
| 1932 _task_queues->register_queue(i, q); | |
| 1933 } | |
| 1934 | |
|
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1935 clear_cset_start_regions(); |
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1936 |
| 342 | 1937 guarantee(_task_queues != NULL, "task_queues allocation failure."); |
| 1938 } | |
| 1939 | |
| 1940 jint G1CollectedHeap::initialize() { | |
| 1166 | 1941 CollectedHeap::pre_initialize(); |
| 342 | 1942 os::enable_vtime(); |
| 1943 | |
|
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1944 G1Log::init(); |
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1945 |
| 342 | 1946 // Necessary to satisfy locking discipline assertions. |
| 1947 | |
| 1948 MutexLocker x(Heap_lock); | |
| 1949 | |
|
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1950 // We have to initialize the printer before committing the heap, as |
|
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1951 // it will be used then. |
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1952 _hr_printer.set_active(G1PrintHeapRegions); |
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1953 |
| 342 | 1954 // While there are no constraints in the GC code that HeapWordSize |
| 1955 // be any particular value, there are multiple other areas in the | |
| 1956 // system which believe this to be true (e.g. oop->object_size in some | |
| 1957 // cases incorrectly returns the size in wordSize units rather than | |
| 1958 // HeapWordSize). | |
| 1959 guarantee(HeapWordSize == wordSize, "HeapWordSize must equal wordSize"); | |
| 1960 | |
| 1961 size_t init_byte_size = collector_policy()->initial_heap_byte_size(); | |
| 1962 size_t max_byte_size = collector_policy()->max_heap_byte_size(); | |
| 1963 | |
| 1964 // Ensure that the sizes are properly aligned. | |
| 1965 Universe::check_alignment(init_byte_size, HeapRegion::GrainBytes, "g1 heap"); | |
| 1966 Universe::check_alignment(max_byte_size, HeapRegion::GrainBytes, "g1 heap"); | |
| 1967 | |
| 1968 _cg1r = new ConcurrentG1Refine(); | |
| 1969 | |
| 1970 // Reserve the maximum. | |
| 1971 PermanentGenerationSpec* pgs = collector_policy()->permanent_generation(); | |
| 1972 // Includes the perm-gen. | |
|
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1973 |
|
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1974 // When compressed oops are enabled, the preferred heap base |
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1975 // is calculated by subtracting the requested size from the |
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1976 // 32Gb boundary and using the result as the base address for |
|
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1977 // heap reservation. If the requested size is not aligned to |
|
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1978 // HeapRegion::GrainBytes (i.e. the alignment that is passed |
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1979 // into the ReservedHeapSpace constructor) then the actual |
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1980 // base of the reserved heap may end up differing from the |
|
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1981 // address that was requested (i.e. the preferred heap base). |
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1982 // If this happens then we could end up using a non-optimal |
|
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1983 // compressed oops mode. |
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1984 |
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1985 // Since max_byte_size is aligned to the size of a heap region (checked |
|
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1986 // above), we also need to align the perm gen size as it might not be. |
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1987 const size_t total_reserved = max_byte_size + |
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1988 align_size_up(pgs->max_size(), HeapRegion::GrainBytes); |
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1989 Universe::check_alignment(total_reserved, HeapRegion::GrainBytes, "g1 heap and perm"); |
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1990 |
|
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1991 char* addr = Universe::preferred_heap_base(total_reserved, Universe::UnscaledNarrowOop); |
|
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1992 |
|
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1993 ReservedHeapSpace heap_rs(total_reserved, HeapRegion::GrainBytes, |
|
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1994 UseLargePages, addr); |
|
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1995 |
|
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1996 if (UseCompressedOops) { |
|
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1997 if (addr != NULL && !heap_rs.is_reserved()) { |
|
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1998 // Failed to reserve at specified address - the requested memory |
|
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1999 // region is taken already, for example, by 'java' launcher. |
|
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2000 // Try again to reserver heap higher. |
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2001 addr = Universe::preferred_heap_base(total_reserved, Universe::ZeroBasedNarrowOop); |
|
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2002 |
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2003 ReservedHeapSpace heap_rs0(total_reserved, HeapRegion::GrainBytes, |
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2004 UseLargePages, addr); |
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2005 |
|
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2006 if (addr != NULL && !heap_rs0.is_reserved()) { |
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2007 // Failed to reserve at specified address again - give up. |
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2008 addr = Universe::preferred_heap_base(total_reserved, Universe::HeapBasedNarrowOop); |
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2009 assert(addr == NULL, ""); |
|
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2010 |
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2011 ReservedHeapSpace heap_rs1(total_reserved, HeapRegion::GrainBytes, |
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2012 UseLargePages, addr); |
|
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2013 heap_rs = heap_rs1; |
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2014 } else { |
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2015 heap_rs = heap_rs0; |
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2016 } |
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2017 } |
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2018 } |
| 342 | 2019 |
| 2020 if (!heap_rs.is_reserved()) { | |
| 2021 vm_exit_during_initialization("Could not reserve enough space for object heap"); | |
| 2022 return JNI_ENOMEM; | |
| 2023 } | |
| 2024 | |
| 2025 // It is important to do this in a way such that concurrent readers can't | |
| 2026 // temporarily think somethings in the heap. (I've actually seen this | |
| 2027 // happen in asserts: DLD.) | |
| 2028 _reserved.set_word_size(0); | |
| 2029 _reserved.set_start((HeapWord*)heap_rs.base()); | |
| 2030 _reserved.set_end((HeapWord*)(heap_rs.base() + heap_rs.size())); | |
| 2031 | |
|
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2032 _expansion_regions = (uint) (max_byte_size / HeapRegion::GrainBytes); |
| 342 | 2033 |
| 2034 // Create the gen rem set (and barrier set) for the entire reserved region. | |
| 2035 _rem_set = collector_policy()->create_rem_set(_reserved, 2); | |
| 2036 set_barrier_set(rem_set()->bs()); | |
| 2037 if (barrier_set()->is_a(BarrierSet::ModRef)) { | |
| 2038 _mr_bs = (ModRefBarrierSet*)_barrier_set; | |
| 2039 } else { | |
| 2040 vm_exit_during_initialization("G1 requires a mod ref bs."); | |
| 2041 return JNI_ENOMEM; | |
| 2042 } | |
| 2043 | |
| 2044 // Also create a G1 rem set. | |
| 1861 | 2045 if (mr_bs()->is_a(BarrierSet::CardTableModRef)) { |
| 2046 _g1_rem_set = new G1RemSet(this, (CardTableModRefBS*)mr_bs()); | |
| 342 | 2047 } else { |
| 1861 | 2048 vm_exit_during_initialization("G1 requires a cardtable mod ref bs."); |
| 2049 return JNI_ENOMEM; | |
| 342 | 2050 } |
| 2051 | |
| 2052 // Carve out the G1 part of the heap. | |
| 2053 | |
| 2054 ReservedSpace g1_rs = heap_rs.first_part(max_byte_size); | |
| 2055 _g1_reserved = MemRegion((HeapWord*)g1_rs.base(), | |
| 2056 g1_rs.size()/HeapWordSize); | |
| 2057 ReservedSpace perm_gen_rs = heap_rs.last_part(max_byte_size); | |
| 2058 | |
| 2059 _perm_gen = pgs->init(perm_gen_rs, pgs->init_size(), rem_set()); | |
| 2060 | |
| 2061 _g1_storage.initialize(g1_rs, 0); | |
| 2062 _g1_committed = MemRegion((HeapWord*)_g1_storage.low(), (size_t) 0); | |
| 3766 | 2063 _hrs.initialize((HeapWord*) _g1_reserved.start(), |
| 2064 (HeapWord*) _g1_reserved.end(), | |
| 2065 _expansion_regions); | |
| 342 | 2066 |
|
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2067 // 6843694 - ensure that the maximum region index can fit |
|
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2068 // in the remembered set structures. |
|
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2069 const uint max_region_idx = (1U << (sizeof(RegionIdx_t)*BitsPerByte-1)) - 1; |
|
807
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|
2070 guarantee((max_regions() - 1) <= max_region_idx, "too many regions"); |
|
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2071 |
|
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|
2072 size_t max_cards_per_region = ((size_t)1 << (sizeof(CardIdx_t)*BitsPerByte-1)) - 1; |
|
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|
2073 guarantee(HeapRegion::CardsPerRegion > 0, "make sure it's initialized"); |
|
3986
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|
2074 guarantee(HeapRegion::CardsPerRegion < max_cards_per_region, |
|
942
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|
2075 "too many cards per region"); |
|
807
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2076 |
| 2152 | 2077 HeapRegionSet::set_unrealistically_long_length(max_regions() + 1); |
| 2078 | |
| 342 | 2079 _bot_shared = new G1BlockOffsetSharedArray(_reserved, |
| 2080 heap_word_size(init_byte_size)); | |
| 2081 | |
| 2082 _g1h = this; | |
| 2083 | |
|
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2084 _in_cset_fast_test_length = max_regions(); |
|
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2085 _in_cset_fast_test_base = |
|
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2086 NEW_C_HEAP_ARRAY(bool, (size_t) _in_cset_fast_test_length); |
|
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2087 |
|
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|
2088 // We're biasing _in_cset_fast_test to avoid subtracting the |
|
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2089 // beginning of the heap every time we want to index; basically |
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2090 // it's the same with what we do with the card table. |
|
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2091 _in_cset_fast_test = _in_cset_fast_test_base - |
|
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2092 ((uintx) _g1_reserved.start() >> HeapRegion::LogOfHRGrainBytes); |
|
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2093 |
|
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2094 // Clear the _cset_fast_test bitmap in anticipation of adding |
|
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2095 // regions to the incremental collection set for the first |
|
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2096 // evacuation pause. |
|
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2097 clear_cset_fast_test(); |
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2098 |
| 342 | 2099 // Create the ConcurrentMark data structure and thread. |
| 2100 // (Must do this late, so that "max_regions" is defined.) | |
|
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2101 _cm = new ConcurrentMark(heap_rs, max_regions()); |
| 342 | 2102 _cmThread = _cm->cmThread(); |
| 2103 | |
| 2104 // Initialize the from_card cache structure of HeapRegionRemSet. | |
| 2105 HeapRegionRemSet::init_heap(max_regions()); | |
| 2106 | |
| 677 | 2107 // Now expand into the initial heap size. |
|
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2108 if (!expand(init_byte_size)) { |
|
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|
2109 vm_exit_during_initialization("Failed to allocate initial heap."); |
|
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2110 return JNI_ENOMEM; |
|
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|
2111 } |
| 342 | 2112 |
| 2113 // Perform any initialization actions delegated to the policy. | |
| 2114 g1_policy()->init(); | |
| 2115 | |
| 2116 _refine_cte_cl = | |
| 2117 new RefineCardTableEntryClosure(ConcurrentG1RefineThread::sts(), | |
| 2118 g1_rem_set(), | |
| 2119 concurrent_g1_refine()); | |
| 2120 JavaThread::dirty_card_queue_set().set_closure(_refine_cte_cl); | |
| 2121 | |
| 2122 JavaThread::satb_mark_queue_set().initialize(SATB_Q_CBL_mon, | |
| 2123 SATB_Q_FL_lock, | |
| 1111 | 2124 G1SATBProcessCompletedThreshold, |
| 342 | 2125 Shared_SATB_Q_lock); |
| 794 | 2126 |
| 2127 JavaThread::dirty_card_queue_set().initialize(DirtyCardQ_CBL_mon, | |
| 2128 DirtyCardQ_FL_lock, | |
| 1111 | 2129 concurrent_g1_refine()->yellow_zone(), |
| 2130 concurrent_g1_refine()->red_zone(), | |
| 794 | 2131 Shared_DirtyCardQ_lock); |
| 2132 | |
|
616
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2133 if (G1DeferredRSUpdate) { |
|
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|
2134 dirty_card_queue_set().initialize(DirtyCardQ_CBL_mon, |
|
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|
2135 DirtyCardQ_FL_lock, |
| 1111 | 2136 -1, // never trigger processing |
| 2137 -1, // no limit on length | |
|
616
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|
2138 Shared_DirtyCardQ_lock, |
|
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|
2139 &JavaThread::dirty_card_queue_set()); |
|
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|
2140 } |
| 1705 | 2141 |
| 2142 // Initialize the card queue set used to hold cards containing | |
| 2143 // references into the collection set. | |
| 2144 _into_cset_dirty_card_queue_set.initialize(DirtyCardQ_CBL_mon, | |
| 2145 DirtyCardQ_FL_lock, | |
| 2146 -1, // never trigger processing | |
| 2147 -1, // no limit on length | |
| 2148 Shared_DirtyCardQ_lock, | |
| 2149 &JavaThread::dirty_card_queue_set()); | |
| 2150 | |
| 342 | 2151 // In case we're keeping closure specialization stats, initialize those |
| 2152 // counts and that mechanism. | |
| 2153 SpecializationStats::clear(); | |
| 2154 | |
| 2155 // Do later initialization work for concurrent refinement. | |
| 2156 _cg1r->init(); | |
| 2157 | |
|
2433
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|
2158 // Here we allocate the dummy full region that is required by the |
|
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|
2159 // G1AllocRegion class. If we don't pass an address in the reserved |
|
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|
2160 // space here, lots of asserts fire. |
| 3766 | 2161 |
| 2162 HeapRegion* dummy_region = new_heap_region(0 /* index of bottom region */, | |
| 2163 _g1_reserved.start()); | |
|
2433
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|
2164 // We'll re-use the same region whether the alloc region will |
|
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|
2165 // require BOT updates or not and, if it doesn't, then a non-young |
|
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|
2166 // region will complain that it cannot support allocations without |
|
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2167 // BOT updates. So we'll tag the dummy region as young to avoid that. |
|
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|
2168 dummy_region->set_young(); |
|
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|
2169 // Make sure it's full. |
|
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|
2170 dummy_region->set_top(dummy_region->end()); |
|
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|
2171 G1AllocRegion::setup(this, dummy_region); |
|
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|
2172 |
|
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|
2173 init_mutator_alloc_region(); |
|
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|
2174 |
|
3289
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|
2175 // Do create of the monitoring and management support so that |
|
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|
2176 // values in the heap have been properly initialized. |
|
3980
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|
2177 _g1mm = new G1MonitoringSupport(this); |
|
3289
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|
2178 |
| 342 | 2179 return JNI_OK; |
| 2180 } | |
| 2181 | |
| 2182 void G1CollectedHeap::ref_processing_init() { | |
|
1974
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|
2183 // Reference processing in G1 currently works as follows: |
|
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|
2184 // |
|
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|
2185 // * There are two reference processor instances. One is |
|
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|
2186 // used to record and process discovered references |
|
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|
2187 // during concurrent marking; the other is used to |
|
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|
2188 // record and process references during STW pauses |
|
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|
2189 // (both full and incremental). |
|
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|
2190 // * Both ref processors need to 'span' the entire heap as |
|
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|
2191 // the regions in the collection set may be dotted around. |
|
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|
2192 // |
|
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|
2193 // * For the concurrent marking ref processor: |
|
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|
2194 // * Reference discovery is enabled at initial marking. |
|
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|
2195 // * Reference discovery is disabled and the discovered |
|
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|
2196 // references processed etc during remarking. |
|
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|
2197 // * Reference discovery is MT (see below). |
|
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|
2198 // * Reference discovery requires a barrier (see below). |
|
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|
2199 // * Reference processing may or may not be MT |
|
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|
2200 // (depending on the value of ParallelRefProcEnabled |
|
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|
2201 // and ParallelGCThreads). |
|
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|
2202 // * A full GC disables reference discovery by the CM |
|
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|
2203 // ref processor and abandons any entries on it's |
|
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|
2204 // discovered lists. |
|
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|
2205 // |
|
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|
2206 // * For the STW processor: |
|
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|
2207 // * Non MT discovery is enabled at the start of a full GC. |
|
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|
2208 // * Processing and enqueueing during a full GC is non-MT. |
|
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|
2209 // * During a full GC, references are processed after marking. |
|
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|
2210 // |
|
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|
2211 // * Discovery (may or may not be MT) is enabled at the start |
|
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|
2212 // of an incremental evacuation pause. |
|
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|
2213 // * References are processed near the end of a STW evacuation pause. |
|
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|
2214 // * For both types of GC: |
|
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|
2215 // * Discovery is atomic - i.e. not concurrent. |
|
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|
2216 // * Reference discovery will not need a barrier. |
|
1974
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|
2217 |
| 342 | 2218 SharedHeap::ref_processing_init(); |
| 2219 MemRegion mr = reserved_region(); | |
|
3979
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|
2220 |
|
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|
2221 // Concurrent Mark ref processor |
|
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|
2222 _ref_processor_cm = |
|
2369
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diff
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|
2223 new ReferenceProcessor(mr, // span |
|
3979
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|
2224 ParallelRefProcEnabled && (ParallelGCThreads > 1), |
|
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|
2225 // mt processing |
|
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|
2226 (int) ParallelGCThreads, |
|
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|
2227 // degree of mt processing |
|
4dfb2df418f2
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|
2228 (ParallelGCThreads > 1) || (ConcGCThreads > 1), |
|
4dfb2df418f2
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|
2229 // mt discovery |
|
4dfb2df418f2
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|
2230 (int) MAX2(ParallelGCThreads, ConcGCThreads), |
|
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|
2231 // degree of mt discovery |
|
4dfb2df418f2
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diff
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|
2232 false, |
|
4dfb2df418f2
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|
2233 // Reference discovery is not atomic |
|
4dfb2df418f2
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|
2234 &_is_alive_closure_cm, |
|
4dfb2df418f2
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|
2235 // is alive closure |
|
4dfb2df418f2
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|
2236 // (for efficiency/performance) |
|
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|
2237 true); |
|
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|
2238 // Setting next fields of discovered |
|
4dfb2df418f2
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|
2239 // lists requires a barrier. |
|
4dfb2df418f2
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diff
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|
2240 |
|
4dfb2df418f2
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|
2241 // STW ref processor |
|
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|
2242 _ref_processor_stw = |
|
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|
2243 new ReferenceProcessor(mr, // span |
|
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|
2244 ParallelRefProcEnabled && (ParallelGCThreads > 1), |
|
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|
2245 // mt processing |
|
4dfb2df418f2
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|
2246 MAX2((int)ParallelGCThreads, 1), |
|
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|
2247 // degree of mt processing |
|
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|
2248 (ParallelGCThreads > 1), |
|
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|
2249 // mt discovery |
|
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|
2250 MAX2((int)ParallelGCThreads, 1), |
|
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|
2251 // degree of mt discovery |
|
4dfb2df418f2
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diff
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|
2252 true, |
|
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|
2253 // Reference discovery is atomic |
|
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|
2254 &_is_alive_closure_stw, |
|
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|
2255 // is alive closure |
|
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|
2256 // (for efficiency/performance) |
|
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|
2257 false); |
|
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|
2258 // Setting next fields of discovered |
|
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|
2259 // lists requires a barrier. |
| 342 | 2260 } |
| 2261 | |
| 2262 size_t G1CollectedHeap::capacity() const { | |
| 2263 return _g1_committed.byte_size(); | |
| 2264 } | |
| 2265 | |
| 1705 | 2266 void G1CollectedHeap::iterate_dirty_card_closure(CardTableEntryClosure* cl, |
| 2267 DirtyCardQueue* into_cset_dcq, | |
| 2268 bool concurrent, | |
| 342 | 2269 int worker_i) { |
| 889 | 2270 // Clean cards in the hot card cache |
| 1705 | 2271 concurrent_g1_refine()->clean_up_cache(worker_i, g1_rem_set(), into_cset_dcq); |
| 889 | 2272 |
| 342 | 2273 DirtyCardQueueSet& dcqs = JavaThread::dirty_card_queue_set(); |
| 2274 int n_completed_buffers = 0; | |
| 1705 | 2275 while (dcqs.apply_closure_to_completed_buffer(cl, worker_i, 0, true)) { |
| 342 | 2276 n_completed_buffers++; |
| 2277 } | |
|
6219
922993931b3d
7178361: G1: Make sure that PrintGC and PrintGCDetails use the same timing for the GC pause
brutisso
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6188
diff
changeset
|
2278 g1_policy()->phase_times()->record_update_rs_processed_buffers(worker_i, |
| 342 | 2279 (double) n_completed_buffers); |
| 2280 dcqs.clear_n_completed_buffers(); | |
| 2281 assert(!dcqs.completed_buffers_exist_dirty(), "Completed buffers exist!"); | |
| 2282 } | |
| 2283 | |
| 2284 | |
| 2285 // Computes the sum of the storage used by the various regions. | |
| 2286 | |
| 2287 size_t G1CollectedHeap::used() const { | |
|
862
36b5611220a7
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861
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|
2288 assert(Heap_lock->owner() != NULL, |
|
36b5611220a7
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changeset
|
2289 "Should be owned on this thread's behalf."); |
| 342 | 2290 size_t result = _summary_bytes_used; |
|
845
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|
2291 // Read only once in case it is set to NULL concurrently |
|
2433
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|
2292 HeapRegion* hr = _mutator_alloc_region.get(); |
|
845
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|
2293 if (hr != NULL) |
|
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|
2294 result += hr->used(); |
| 342 | 2295 return result; |
| 2296 } | |
| 2297 | |
|
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
|
2298 size_t G1CollectedHeap::used_unlocked() const { |
|
42d84bbbecf4
6859911: G1: assert(Heap_lock->owner() = NULL, "Should be owned on this thread's behalf")
tonyp
parents:
845
diff
changeset
|
2299 size_t result = _summary_bytes_used; |
|
42d84bbbecf4
6859911: G1: assert(Heap_lock->owner() = NULL, "Should be owned on this thread's behalf")
tonyp
parents:
845
diff
changeset
|
2300 return result; |
|
42d84bbbecf4
6859911: G1: assert(Heap_lock->owner() = NULL, "Should be owned on this thread's behalf")
tonyp
parents:
845
diff
changeset
|
2301 } |
|
42d84bbbecf4
6859911: G1: assert(Heap_lock->owner() = NULL, "Should be owned on this thread's behalf")
tonyp
parents:
845
diff
changeset
|
2302 |
| 342 | 2303 class SumUsedClosure: public HeapRegionClosure { |
| 2304 size_t _used; | |
| 2305 public: | |
| 2306 SumUsedClosure() : _used(0) {} | |
| 2307 bool doHeapRegion(HeapRegion* r) { | |
| 2308 if (!r->continuesHumongous()) { | |
| 2309 _used += r->used(); | |
| 2310 } | |
| 2311 return false; | |
| 2312 } | |
| 2313 size_t result() { return _used; } | |
| 2314 }; | |
| 2315 | |
| 2316 size_t G1CollectedHeap::recalculate_used() const { | |
| 2317 SumUsedClosure blk; | |
| 3766 | 2318 heap_region_iterate(&blk); |
| 342 | 2319 return blk.result(); |
| 2320 } | |
| 2321 | |
| 2322 size_t G1CollectedHeap::unsafe_max_alloc() { | |
| 2152 | 2323 if (free_regions() > 0) return HeapRegion::GrainBytes; |
| 342 | 2324 // otherwise, is there space in the current allocation region? |
| 2325 | |
| 2326 // We need to store the current allocation region in a local variable | |
| 2327 // here. The problem is that this method doesn't take any locks and | |
| 2328 // there may be other threads which overwrite the current allocation | |
| 2329 // region field. attempt_allocation(), for example, sets it to NULL | |
| 2330 // and this can happen *after* the NULL check here but before the call | |
| 2331 // to free(), resulting in a SIGSEGV. Note that this doesn't appear | |
| 2332 // to be a problem in the optimized build, since the two loads of the | |
| 2333 // current allocation region field are optimized away. | |
|
2433
abdfc822206f
7023069: G1: Introduce symmetric locking in the slow allocation path
tonyp
parents:
2432
diff
changeset
|
2334 HeapRegion* hr = _mutator_alloc_region.get(); |
|
abdfc822206f
7023069: G1: Introduce symmetric locking in the slow allocation path
tonyp
parents:
2432
diff
changeset
|
2335 if (hr == NULL) { |
| 342 | 2336 return 0; |
| 2337 } | |
|
2433
abdfc822206f
7023069: G1: Introduce symmetric locking in the slow allocation path
tonyp
parents:
2432
diff
changeset
|
2338 return hr->free(); |
| 342 | 2339 } |
| 2340 | |
|
1656
4e5661ba9d98
6944166: G1: explicit GCs are not always handled correctly
tonyp
parents:
1611
diff
changeset
|
2341 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
|
2342 switch (cause) { |
|
caa4652b4414
7129892: G1: explicit marking cycle initiation might fail to initiate a marking cycle
tonyp
parents:
4875
diff
changeset
|
2343 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
|
2344 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
|
2345 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
|
2346 default: return false; |
|
caa4652b4414
7129892: G1: explicit marking cycle initiation might fail to initiate a marking cycle
tonyp
parents:
4875
diff
changeset
|
2347 } |
|
1656
4e5661ba9d98
6944166: G1: explicit GCs are not always handled correctly
tonyp
parents:
1611
diff
changeset
|
2348 } |
|
4e5661ba9d98
6944166: G1: explicit GCs are not always handled correctly
tonyp
parents:
1611
diff
changeset
|
2349 |
|
3285
49a67202bc67
7011855: G1: non-product flag to artificially grow the heap
tonyp
parents:
2433
diff
changeset
|
2350 #ifndef PRODUCT |
|
49a67202bc67
7011855: G1: non-product flag to artificially grow the heap
tonyp
parents:
2433
diff
changeset
|
2351 void G1CollectedHeap::allocate_dummy_regions() { |
|
49a67202bc67
7011855: G1: non-product flag to artificially grow the heap
tonyp
parents:
2433
diff
changeset
|
2352 // Let's fill up most of the region |
|
49a67202bc67
7011855: G1: non-product flag to artificially grow the heap
tonyp
parents:
2433
diff
changeset
|
2353 size_t word_size = HeapRegion::GrainWords - 1024; |
|
49a67202bc67
7011855: G1: non-product flag to artificially grow the heap
tonyp
parents:
2433
diff
changeset
|
2354 // 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
|
2355 guarantee(isHumongous(word_size), "sanity"); |
|
49a67202bc67
7011855: G1: non-product flag to artificially grow the heap
tonyp
parents:
2433
diff
changeset
|
2356 |
|
49a67202bc67
7011855: G1: non-product flag to artificially grow the heap
tonyp
parents:
2433
diff
changeset
|
2357 for (uintx i = 0; i < G1DummyRegionsPerGC; ++i) { |
|
49a67202bc67
7011855: G1: non-product flag to artificially grow the heap
tonyp
parents:
2433
diff
changeset
|
2358 // 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
|
2359 HeapWord* dummy_obj = humongous_obj_allocate(word_size); |
|
49a67202bc67
7011855: G1: non-product flag to artificially grow the heap
tonyp
parents:
2433
diff
changeset
|
2360 if (dummy_obj != NULL) { |
|
49a67202bc67
7011855: G1: non-product flag to artificially grow the heap
tonyp
parents:
2433
diff
changeset
|
2361 MemRegion mr(dummy_obj, word_size); |
|
49a67202bc67
7011855: G1: non-product flag to artificially grow the heap
tonyp
parents:
2433
diff
changeset
|
2362 CollectedHeap::fill_with_object(mr); |
|
49a67202bc67
7011855: G1: non-product flag to artificially grow the heap
tonyp
parents:
2433
diff
changeset
|
2363 } else { |
|
49a67202bc67
7011855: G1: non-product flag to artificially grow the heap
tonyp
parents:
2433
diff
changeset
|
2364 // 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
|
2365 // again. Let's get out of the loop. |
|
49a67202bc67
7011855: G1: non-product flag to artificially grow the heap
tonyp
parents:
2433
diff
changeset
|
2366 break; |
|
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 } |
|
49a67202bc67
7011855: G1: non-product flag to artificially grow the heap
tonyp
parents:
2433
diff
changeset
|
2370 #endif // !PRODUCT |
|
49a67202bc67
7011855: G1: non-product flag to artificially grow the heap
tonyp
parents:
2433
diff
changeset
|
2371 |
|
6120
37552638d24a
7172388: G1: _total_full_collections should not be incremented for concurrent cycles
brutisso
parents:
6109
diff
changeset
|
2372 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
|
2373 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
|
2374 _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
|
2375 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
|
2376 _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
|
2377 |
|
37552638d24a
7172388: G1: _total_full_collections should not be incremented for concurrent cycles
brutisso
parents:
6109
diff
changeset
|
2378 _old_marking_cycles_started++; |
|
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 |
|
37552638d24a
7172388: G1: _total_full_collections should not be incremented for concurrent cycles
brutisso
parents:
6109
diff
changeset
|
2381 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
|
2382 MonitorLockerEx x(FullGCCount_lock, Mutex::_no_safepoint_check_flag); |
|
4e5661ba9d98
6944166: G1: explicit GCs are not always handled correctly
tonyp
parents:
1611
diff
changeset
|
2383 |
|
2030
fb712ff22571
7000559: G1: assertion failure !outer || (full_collections_started == _full_collections_completed + 1)
tonyp
parents:
1995
diff
changeset
|
2384 // 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
|
2385 // 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
|
2386 // 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
|
2387 // assert here. |
|
fb712ff22571
7000559: G1: assertion failure !outer || (full_collections_started == _full_collections_completed + 1)
tonyp
parents:
1995
diff
changeset
|
2388 |
|
1656
4e5661ba9d98
6944166: G1: explicit GCs are not always handled correctly
tonyp
parents:
1611
diff
changeset
|
2389 // 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
|
2390 // 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
|
2391 // interrupt a concurrent cycle), the number of full collections |
|
4e5661ba9d98
6944166: G1: explicit GCs are not always handled correctly
tonyp
parents:
1611
diff
changeset
|
2392 // 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
|
2393 // 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
|
2394 // behind the number of full collections started. |
|
4e5661ba9d98
6944166: G1: explicit GCs are not always handled correctly
tonyp
parents:
1611
diff
changeset
|
2395 |
|
4e5661ba9d98
6944166: G1: explicit GCs are not always handled correctly
tonyp
parents:
1611
diff
changeset
|
2396 // 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
|
2397 assert(concurrent || |
|
6120
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 + 1) || |
|
37552638d24a
7172388: G1: _total_full_collections should not be incremented for concurrent cycles
brutisso
parents:
6109
diff
changeset
|
2399 (_old_marking_cycles_started == _old_marking_cycles_completed + 2), |
|
37552638d24a
7172388: G1: _total_full_collections should not be incremented for concurrent cycles
brutisso
parents:
6109
diff
changeset
|
2400 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
|
2401 "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
|
2402 _old_marking_cycles_started, _old_marking_cycles_completed)); |
|
1656
4e5661ba9d98
6944166: G1: explicit GCs are not always handled correctly
tonyp
parents:
1611
diff
changeset
|
2403 |
|
4e5661ba9d98
6944166: G1: explicit GCs are not always handled correctly
tonyp
parents:
1611
diff
changeset
|
2404 // 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
|
2405 assert(!concurrent || |
|
6120
37552638d24a
7172388: G1: _total_full_collections should not be incremented for concurrent cycles
brutisso
parents:
6109
diff
changeset
|
2406 (_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
|
2407 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
|
2408 "_old_marking_cycles_started = %u " |
|
37552638d24a
7172388: G1: _total_full_collections should not be incremented for concurrent cycles
brutisso
parents:
6109
diff
changeset
|
2409 "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
|
2410 _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
|
2411 |
|
37552638d24a
7172388: G1: _total_full_collections should not be incremented for concurrent cycles
brutisso
parents:
6109
diff
changeset
|
2412 _old_marking_cycles_completed += 1; |
|
1656
4e5661ba9d98
6944166: G1: explicit GCs are not always handled correctly
tonyp
parents:
1611
diff
changeset
|
2413 |
|
1840
4e0094bc41fa
6983311: G1: LoopTest hangs when run with -XX:+ExplicitInvokesConcurrent
johnc
parents:
1833
diff
changeset
|
2414 // 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
|
2415 // we wake up any waiters (especially when ExplicitInvokesConcurrent |
|
4e0094bc41fa
6983311: G1: LoopTest hangs when run with -XX:+ExplicitInvokesConcurrent
johnc
parents:
1833
diff
changeset
|
2416 // 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
|
2417 // 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
|
2418 if (concurrent) { |
|
1840
4e0094bc41fa
6983311: G1: LoopTest hangs when run with -XX:+ExplicitInvokesConcurrent
johnc
parents:
1833
diff
changeset
|
2419 _cmThread->clear_in_progress(); |
|
4e0094bc41fa
6983311: G1: LoopTest hangs when run with -XX:+ExplicitInvokesConcurrent
johnc
parents:
1833
diff
changeset
|
2420 } |
|
4e0094bc41fa
6983311: G1: LoopTest hangs when run with -XX:+ExplicitInvokesConcurrent
johnc
parents:
1833
diff
changeset
|
2421 |
|
1656
4e5661ba9d98
6944166: G1: explicit GCs are not always handled correctly
tonyp
parents:
1611
diff
changeset
|
2422 // 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
|
2423 // System.gc() with (with ExplicitGCInvokesConcurrent set or not) |
|
4e5661ba9d98
6944166: G1: explicit GCs are not always handled correctly
tonyp
parents:
1611
diff
changeset
|
2424 // 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
|
2425 // waiting in VM_G1IncCollectionPause::doit_epilogue(). |
|
4e5661ba9d98
6944166: G1: explicit GCs are not always handled correctly
tonyp
parents:
1611
diff
changeset
|
2426 FullGCCount_lock->notify_all(); |
|
4e5661ba9d98
6944166: G1: explicit GCs are not always handled correctly
tonyp
parents:
1611
diff
changeset
|
2427 } |
|
4e5661ba9d98
6944166: G1: explicit GCs are not always handled correctly
tonyp
parents:
1611
diff
changeset
|
2428 |
| 342 | 2429 void G1CollectedHeap::collect_as_vm_thread(GCCause::Cause cause) { |
| 2152 | 2430 assert_at_safepoint(true /* should_be_vm_thread */); |
| 342 | 2431 GCCauseSetter gcs(this, cause); |
| 2432 switch (cause) { | |
| 2433 case GCCause::_heap_inspection: | |
| 2434 case GCCause::_heap_dump: { | |
| 2435 HandleMark hm; | |
| 2436 do_full_collection(false); // don't clear all soft refs | |
| 2437 break; | |
| 2438 } | |
| 2439 default: // XXX FIX ME | |
| 2440 ShouldNotReachHere(); // Unexpected use of this function | |
| 2441 } | |
| 2442 } | |
| 2443 | |
|
1088
3fc996d4edd2
6902303: G1: ScavengeALot should cause an incremental, rather than a full, collection
ysr
parents:
1045
diff
changeset
|
2444 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
|
2445 assert_heap_not_locked(); |
|
1088
3fc996d4edd2
6902303: G1: ScavengeALot should cause an incremental, rather than a full, collection
ysr
parents:
1045
diff
changeset
|
2446 |
|
1656
4e5661ba9d98
6944166: G1: explicit GCs are not always handled correctly
tonyp
parents:
1611
diff
changeset
|
2447 unsigned int gc_count_before; |
|
6120
37552638d24a
7172388: G1: _total_full_collections should not be incremented for concurrent cycles
brutisso
parents:
6109
diff
changeset
|
2448 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
|
2449 bool retry_gc; |
|
caa4652b4414
7129892: G1: explicit marking cycle initiation might fail to initiate a marking cycle
tonyp
parents:
4875
diff
changeset
|
2450 |
|
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2451 do { |
|
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2452 retry_gc = false; |
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2453 |
|
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2454 { |
|
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2455 MutexLocker ml(Heap_lock); |
|
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2456 |
|
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2457 // Read the GC count while holding the Heap_lock |
|
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2458 gc_count_before = total_collections(); |
|
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2459 old_marking_count_before = _old_marking_cycles_started; |
|
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2460 } |
|
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2461 |
|
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2462 if (should_do_concurrent_full_gc(cause)) { |
|
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2463 // Schedule an initial-mark evacuation pause that will start a |
|
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2464 // concurrent cycle. We're setting word_size to 0 which means that |
|
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2465 // we are not requesting a post-GC allocation. |
|
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2466 VM_G1IncCollectionPause op(gc_count_before, |
| 1973 | 2467 0, /* word_size */ |
|
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2468 true, /* should_initiate_conc_mark */ |
|
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2469 g1_policy()->max_pause_time_ms(), |
|
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2470 cause); |
|
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2471 |
|
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2472 VMThread::execute(&op); |
|
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2473 if (!op.pause_succeeded()) { |
|
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2474 if (old_marking_count_before == _old_marking_cycles_started) { |
|
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2475 retry_gc = op.should_retry_gc(); |
|
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2476 } else { |
|
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2477 // A Full GC happened while we were trying to schedule the |
|
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2478 // initial-mark GC. No point in starting a new cycle given |
|
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2479 // that the whole heap was collected anyway. |
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2480 } |
|
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2481 |
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2482 if (retry_gc) { |
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2483 if (GC_locker::is_active_and_needs_gc()) { |
|
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2484 GC_locker::stall_until_clear(); |
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2485 } |
|
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2486 } |
|
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2487 } |
|
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2488 } else { |
|
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2489 if (cause == GCCause::_gc_locker |
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2490 DEBUG_ONLY(|| cause == GCCause::_scavenge_alot)) { |
|
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2491 |
|
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2492 // Schedule a standard evacuation pause. We're setting word_size |
|
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2493 // to 0 which means that we are not requesting a post-GC allocation. |
|
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2494 VM_G1IncCollectionPause op(gc_count_before, |
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2495 0, /* word_size */ |
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2496 false, /* should_initiate_conc_mark */ |
|
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2497 g1_policy()->max_pause_time_ms(), |
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2498 cause); |
|
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2499 VMThread::execute(&op); |
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2500 } else { |
|
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2501 // Schedule a Full GC. |
|
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2502 VM_G1CollectFull op(gc_count_before, old_marking_count_before, cause); |
|
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2503 VMThread::execute(&op); |
|
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2504 } |
|
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2505 } |
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|
2506 } while (retry_gc); |
| 342 | 2507 } |
| 2508 | |
| 2509 bool G1CollectedHeap::is_in(const void* p) const { | |
| 4708 | 2510 if (_g1_committed.contains(p)) { |
| 2511 // Given that we know that p is in the committed space, | |
| 2512 // heap_region_containing_raw() should successfully | |
| 2513 // return the containing region. | |
| 2514 HeapRegion* hr = heap_region_containing_raw(p); | |
| 342 | 2515 return hr->is_in(p); |
| 2516 } else { | |
| 2517 return _perm_gen->as_gen()->is_in(p); | |
| 2518 } | |
| 2519 } | |
| 2520 | |
| 2521 // Iteration functions. | |
| 2522 | |
| 2523 // Iterates an OopClosure over all ref-containing fields of objects | |
| 2524 // within a HeapRegion. | |
| 2525 | |
| 2526 class IterateOopClosureRegionClosure: public HeapRegionClosure { | |
| 2527 MemRegion _mr; | |
| 2528 OopClosure* _cl; | |
| 2529 public: | |
| 2530 IterateOopClosureRegionClosure(MemRegion mr, OopClosure* cl) | |
| 2531 : _mr(mr), _cl(cl) {} | |
| 2532 bool doHeapRegion(HeapRegion* r) { | |
| 2533 if (! r->continuesHumongous()) { | |
| 2534 r->oop_iterate(_cl); | |
| 2535 } | |
| 2536 return false; | |
| 2537 } | |
| 2538 }; | |
| 2539 | |
| 678 | 2540 void G1CollectedHeap::oop_iterate(OopClosure* cl, bool do_perm) { |
| 342 | 2541 IterateOopClosureRegionClosure blk(_g1_committed, cl); |
| 3766 | 2542 heap_region_iterate(&blk); |
| 678 | 2543 if (do_perm) { |
| 2544 perm_gen()->oop_iterate(cl); | |
| 2545 } | |
| 342 | 2546 } |
| 2547 | |
| 678 | 2548 void G1CollectedHeap::oop_iterate(MemRegion mr, OopClosure* cl, bool do_perm) { |
| 342 | 2549 IterateOopClosureRegionClosure blk(mr, cl); |
| 3766 | 2550 heap_region_iterate(&blk); |
| 678 | 2551 if (do_perm) { |
| 2552 perm_gen()->oop_iterate(cl); | |
| 2553 } | |
| 342 | 2554 } |
| 2555 | |
| 2556 // Iterates an ObjectClosure over all objects within a HeapRegion. | |
| 2557 | |
| 2558 class IterateObjectClosureRegionClosure: public HeapRegionClosure { | |
| 2559 ObjectClosure* _cl; | |
| 2560 public: | |
| 2561 IterateObjectClosureRegionClosure(ObjectClosure* cl) : _cl(cl) {} | |
| 2562 bool doHeapRegion(HeapRegion* r) { | |
| 2563 if (! r->continuesHumongous()) { | |
| 2564 r->object_iterate(_cl); | |
| 2565 } | |
| 2566 return false; | |
| 2567 } | |
| 2568 }; | |
| 2569 | |
| 678 | 2570 void G1CollectedHeap::object_iterate(ObjectClosure* cl, bool do_perm) { |
| 342 | 2571 IterateObjectClosureRegionClosure blk(cl); |
| 3766 | 2572 heap_region_iterate(&blk); |
| 678 | 2573 if (do_perm) { |
| 2574 perm_gen()->object_iterate(cl); | |
| 2575 } | |
| 342 | 2576 } |
| 2577 | |
| 2578 void G1CollectedHeap::object_iterate_since_last_GC(ObjectClosure* cl) { | |
| 2579 // FIXME: is this right? | |
| 2580 guarantee(false, "object_iterate_since_last_GC not supported by G1 heap"); | |
| 2581 } | |
| 2582 | |
| 2583 // Calls a SpaceClosure on a HeapRegion. | |
| 2584 | |
| 2585 class SpaceClosureRegionClosure: public HeapRegionClosure { | |
| 2586 SpaceClosure* _cl; | |
| 2587 public: | |
| 2588 SpaceClosureRegionClosure(SpaceClosure* cl) : _cl(cl) {} | |
| 2589 bool doHeapRegion(HeapRegion* r) { | |
| 2590 _cl->do_space(r); | |
| 2591 return false; | |
| 2592 } | |
| 2593 }; | |
| 2594 | |
| 2595 void G1CollectedHeap::space_iterate(SpaceClosure* cl) { | |
| 2596 SpaceClosureRegionClosure blk(cl); | |
| 3766 | 2597 heap_region_iterate(&blk); |
| 342 | 2598 } |
| 2599 | |
| 3766 | 2600 void G1CollectedHeap::heap_region_iterate(HeapRegionClosure* cl) const { |
| 2601 _hrs.iterate(cl); | |
| 342 | 2602 } |
| 2603 | |
| 2604 void G1CollectedHeap::heap_region_iterate_from(HeapRegion* r, | |
| 3766 | 2605 HeapRegionClosure* cl) const { |
| 2606 _hrs.iterate_from(r, cl); | |
| 342 | 2607 } |
| 2608 | |
| 2609 void | |
| 2610 G1CollectedHeap::heap_region_par_iterate_chunked(HeapRegionClosure* cl, | |
|
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2611 uint worker, |
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2612 uint no_of_par_workers, |
| 342 | 2613 jint claim_value) { |
|
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2614 const uint regions = n_regions(); |
|
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2615 const uint max_workers = (G1CollectedHeap::use_parallel_gc_threads() ? |
|
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2616 no_of_par_workers : |
|
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2617 1); |
|
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2618 assert(UseDynamicNumberOfGCThreads || |
|
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2619 no_of_par_workers == workers()->total_workers(), |
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2620 "Non dynamic should use fixed number of workers"); |
| 355 | 2621 // try to spread out the starting points of the workers |
|
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2622 const uint start_index = regions / max_workers * worker; |
| 355 | 2623 |
| 2624 // each worker will actually look at all regions | |
|
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2625 for (uint count = 0; count < regions; ++count) { |
|
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2626 const uint index = (start_index + count) % regions; |
| 355 | 2627 assert(0 <= index && index < regions, "sanity"); |
| 2628 HeapRegion* r = region_at(index); | |
| 2629 // we'll ignore "continues humongous" regions (we'll process them | |
| 2630 // when we come across their corresponding "start humongous" | |
| 2631 // region) and regions already claimed | |
| 2632 if (r->claim_value() == claim_value || r->continuesHumongous()) { | |
| 2633 continue; | |
| 2634 } | |
| 2635 // OK, try to claim it | |
| 342 | 2636 if (r->claimHeapRegion(claim_value)) { |
| 355 | 2637 // success! |
| 2638 assert(!r->continuesHumongous(), "sanity"); | |
| 2639 if (r->startsHumongous()) { | |
| 2640 // If the region is "starts humongous" we'll iterate over its | |
| 2641 // "continues humongous" first; in fact we'll do them | |
| 2642 // first. The order is important. In on case, calling the | |
| 2643 // closure on the "starts humongous" region might de-allocate | |
| 2644 // and clear all its "continues humongous" regions and, as a | |
| 2645 // result, we might end up processing them twice. So, we'll do | |
| 2646 // them first (notice: most closures will ignore them anyway) and | |
| 2647 // then we'll do the "starts humongous" region. | |
|
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2648 for (uint ch_index = index + 1; ch_index < regions; ++ch_index) { |
| 355 | 2649 HeapRegion* chr = region_at(ch_index); |
| 2650 | |
| 2651 // if the region has already been claimed or it's not | |
| 2652 // "continues humongous" we're done | |
| 2653 if (chr->claim_value() == claim_value || | |
| 2654 !chr->continuesHumongous()) { | |
| 2655 break; | |
| 2656 } | |
| 2657 | |
| 2658 // Noone should have claimed it directly. We can given | |
| 2659 // that we claimed its "starts humongous" region. | |
| 2660 assert(chr->claim_value() != claim_value, "sanity"); | |
| 2661 assert(chr->humongous_start_region() == r, "sanity"); | |
| 2662 | |
| 2663 if (chr->claimHeapRegion(claim_value)) { | |
| 2664 // we should always be able to claim it; noone else should | |
| 2665 // be trying to claim this region | |
| 2666 | |
| 2667 bool res2 = cl->doHeapRegion(chr); | |
| 2668 assert(!res2, "Should not abort"); | |
| 2669 | |
| 2670 // Right now, this holds (i.e., no closure that actually | |
| 2671 // does something with "continues humongous" regions | |
| 2672 // clears them). We might have to weaken it in the future, | |
| 2673 // but let's leave these two asserts here for extra safety. | |
| 2674 assert(chr->continuesHumongous(), "should still be the case"); | |
| 2675 assert(chr->humongous_start_region() == r, "sanity"); | |
| 2676 } else { | |
| 2677 guarantee(false, "we should not reach here"); | |
| 2678 } | |
| 2679 } | |
| 2680 } | |
| 2681 | |
| 2682 assert(!r->continuesHumongous(), "sanity"); | |
| 2683 bool res = cl->doHeapRegion(r); | |
| 2684 assert(!res, "Should not abort"); | |
| 2685 } | |
| 2686 } | |
| 2687 } | |
| 2688 | |
| 390 | 2689 class ResetClaimValuesClosure: public HeapRegionClosure { |
| 2690 public: | |
| 2691 bool doHeapRegion(HeapRegion* r) { | |
| 2692 r->set_claim_value(HeapRegion::InitialClaimValue); | |
| 2693 return false; | |
| 2694 } | |
| 2695 }; | |
| 2696 | |
|
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2697 void G1CollectedHeap::reset_heap_region_claim_values() { |
| 390 | 2698 ResetClaimValuesClosure blk; |
| 2699 heap_region_iterate(&blk); | |
| 2700 } | |
| 2701 | |
|
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2702 void G1CollectedHeap::reset_cset_heap_region_claim_values() { |
|
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2703 ResetClaimValuesClosure blk; |
|
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2704 collection_set_iterate(&blk); |
|
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2705 } |
|
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2706 |
| 355 | 2707 #ifdef ASSERT |
| 2708 // This checks whether all regions in the heap have the correct claim | |
| 2709 // value. I also piggy-backed on this a check to ensure that the | |
| 2710 // humongous_start_region() information on "continues humongous" | |
| 2711 // regions is correct. | |
| 2712 | |
| 2713 class CheckClaimValuesClosure : public HeapRegionClosure { | |
| 2714 private: | |
| 2715 jint _claim_value; | |
|
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2716 uint _failures; |
| 355 | 2717 HeapRegion* _sh_region; |
|
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2718 |
| 355 | 2719 public: |
| 2720 CheckClaimValuesClosure(jint claim_value) : | |
| 2721 _claim_value(claim_value), _failures(0), _sh_region(NULL) { } | |
| 2722 bool doHeapRegion(HeapRegion* r) { | |
| 2723 if (r->claim_value() != _claim_value) { | |
|
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2724 gclog_or_tty->print_cr("Region " HR_FORMAT ", " |
| 355 | 2725 "claim value = %d, should be %d", |
|
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2726 HR_FORMAT_PARAMS(r), |
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|
2727 r->claim_value(), _claim_value); |
| 355 | 2728 ++_failures; |
| 2729 } | |
| 2730 if (!r->isHumongous()) { | |
| 2731 _sh_region = NULL; | |
| 2732 } else if (r->startsHumongous()) { | |
| 2733 _sh_region = r; | |
| 2734 } else if (r->continuesHumongous()) { | |
| 2735 if (r->humongous_start_region() != _sh_region) { | |
|
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2736 gclog_or_tty->print_cr("Region " HR_FORMAT ", " |
| 355 | 2737 "HS = "PTR_FORMAT", should be "PTR_FORMAT, |
|
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2738 HR_FORMAT_PARAMS(r), |
| 355 | 2739 r->humongous_start_region(), |
| 2740 _sh_region); | |
| 2741 ++_failures; | |
| 342 | 2742 } |
| 2743 } | |
| 355 | 2744 return false; |
| 2745 } | |
|
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2746 uint failures() { return _failures; } |
| 355 | 2747 }; |
| 2748 | |
| 2749 bool G1CollectedHeap::check_heap_region_claim_values(jint claim_value) { | |
| 2750 CheckClaimValuesClosure cl(claim_value); | |
| 2751 heap_region_iterate(&cl); | |
| 2752 return cl.failures() == 0; | |
| 2753 } | |
|
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2754 |
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|
2755 class CheckClaimValuesInCSetHRClosure: public HeapRegionClosure { |
|
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2756 private: |
|
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2757 jint _claim_value; |
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2758 uint _failures; |
|
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2759 |
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2760 public: |
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2761 CheckClaimValuesInCSetHRClosure(jint claim_value) : |
|
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2762 _claim_value(claim_value), _failures(0) { } |
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2763 |
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|
2764 uint failures() { return _failures; } |
|
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2765 |
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2766 bool doHeapRegion(HeapRegion* hr) { |
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2767 assert(hr->in_collection_set(), "how?"); |
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2768 assert(!hr->isHumongous(), "H-region in CSet"); |
|
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2769 if (hr->claim_value() != _claim_value) { |
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2770 gclog_or_tty->print_cr("CSet Region " HR_FORMAT ", " |
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2771 "claim value = %d, should be %d", |
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2772 HR_FORMAT_PARAMS(hr), |
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2773 hr->claim_value(), _claim_value); |
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2774 _failures += 1; |
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|
2775 } |
|
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|
2776 return false; |
|
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|
2777 } |
|
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|
2778 }; |
|
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|
2779 |
|
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|
2780 bool G1CollectedHeap::check_cset_heap_region_claim_values(jint claim_value) { |
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2781 CheckClaimValuesInCSetHRClosure cl(claim_value); |
|
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2782 collection_set_iterate(&cl); |
|
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2783 return cl.failures() == 0; |
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|
2784 } |
| 355 | 2785 #endif // ASSERT |
| 342 | 2786 |
|
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|
2787 // Clear the cached CSet starting regions and (more importantly) |
|
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|
2788 // the time stamps. Called when we reset the GC time stamp. |
|
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|
2789 void G1CollectedHeap::clear_cset_start_regions() { |
|
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|
2790 assert(_worker_cset_start_region != NULL, "sanity"); |
|
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|
2791 assert(_worker_cset_start_region_time_stamp != NULL, "sanity"); |
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2792 |
|
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|
2793 int n_queues = MAX2((int)ParallelGCThreads, 1); |
|
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2794 for (int i = 0; i < n_queues; i++) { |
|
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2795 _worker_cset_start_region[i] = NULL; |
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2796 _worker_cset_start_region_time_stamp[i] = 0; |
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2797 } |
|
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|
2798 } |
|
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|
2799 |
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|
2800 // Given the id of a worker, obtain or calculate a suitable |
|
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2801 // starting region for iterating over the current collection set. |
|
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2802 HeapRegion* G1CollectedHeap::start_cset_region_for_worker(int worker_i) { |
|
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|
2803 assert(get_gc_time_stamp() > 0, "should have been updated by now"); |
|
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2804 |
|
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|
2805 HeapRegion* result = NULL; |
|
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|
2806 unsigned gc_time_stamp = get_gc_time_stamp(); |
|
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|
2807 |
|
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|
2808 if (_worker_cset_start_region_time_stamp[worker_i] == gc_time_stamp) { |
|
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|
2809 // Cached starting region for current worker was set |
|
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|
2810 // during the current pause - so it's valid. |
|
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|
2811 // Note: the cached starting heap region may be NULL |
|
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|
2812 // (when the collection set is empty). |
|
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|
2813 result = _worker_cset_start_region[worker_i]; |
|
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|
2814 assert(result == NULL || result->in_collection_set(), "sanity"); |
|
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|
2815 return result; |
|
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|
2816 } |
|
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|
2817 |
|
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|
2818 // The cached entry was not valid so let's calculate |
|
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2819 // a suitable starting heap region for this worker. |
|
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2820 |
|
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|
2821 // We want the parallel threads to start their collection |
|
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2822 // set iteration at different collection set regions to |
|
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|
2823 // avoid contention. |
|
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|
2824 // If we have: |
|
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|
2825 // n collection set regions |
|
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|
2826 // p threads |
|
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|
2827 // Then thread t will start at region floor ((t * n) / p) |
|
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|
2828 |
|
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|
2829 result = g1_policy()->collection_set(); |
|
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2830 if (G1CollectedHeap::use_parallel_gc_threads()) { |
|
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|
2831 uint cs_size = g1_policy()->cset_region_length(); |
|
4728
441e946dc1af
7121618: Change type of number of GC workers to unsigned int.
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|
2832 uint active_workers = workers()->active_workers(); |
|
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|
2833 assert(UseDynamicNumberOfGCThreads || |
|
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|
2834 active_workers == workers()->total_workers(), |
|
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|
2835 "Unless dynamic should use total workers"); |
|
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|
2836 |
|
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|
2837 uint end_ind = (cs_size * worker_i) / active_workers; |
|
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|
2838 uint start_ind = 0; |
|
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|
2839 |
|
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|
2840 if (worker_i > 0 && |
|
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|
2841 _worker_cset_start_region_time_stamp[worker_i - 1] == gc_time_stamp) { |
|
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|
2842 // Previous workers starting region is valid |
|
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|
2843 // so let's iterate from there |
|
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|
2844 start_ind = (cs_size * (worker_i - 1)) / active_workers; |
|
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|
2845 result = _worker_cset_start_region[worker_i - 1]; |
|
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|
2846 } |
|
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|
2847 |
|
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|
2848 for (uint i = start_ind; i < end_ind; i++) { |
|
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|
2849 result = result->next_in_collection_set(); |
|
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|
2850 } |
|
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|
2851 } |
|
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|
2852 |
|
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|
2853 // Note: the calculated starting heap region may be NULL |
|
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|
2854 // (when the collection set is empty). |
|
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|
2855 assert(result == NULL || result->in_collection_set(), "sanity"); |
|
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changeset
|
2856 assert(_worker_cset_start_region_time_stamp[worker_i] != gc_time_stamp, |
|
fd2b426c30db
7119908: G1: Cache CSet start region for each worker for subsequent reuse
johnc
parents:
4708
diff
changeset
|
2857 "should be updated only once per pause"); |
|
fd2b426c30db
7119908: G1: Cache CSet start region for each worker for subsequent reuse
johnc
parents:
4708
diff
changeset
|
2858 _worker_cset_start_region[worker_i] = result; |
|
fd2b426c30db
7119908: G1: Cache CSet start region for each worker for subsequent reuse
johnc
parents:
4708
diff
changeset
|
2859 OrderAccess::storestore(); |
|
fd2b426c30db
7119908: G1: Cache CSet start region for each worker for subsequent reuse
johnc
parents:
4708
diff
changeset
|
2860 _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
|
2861 return result; |
|
dc467e8b2c5e
7112743: G1: Reduce overhead of marking closure during evacuation pauses
johnc
parents:
4095
diff
changeset
|
2862 } |
|
dc467e8b2c5e
7112743: G1: Reduce overhead of marking closure during evacuation pauses
johnc
parents:
4095
diff
changeset
|
2863 |
| 342 | 2864 void G1CollectedHeap::collection_set_iterate(HeapRegionClosure* cl) { |
| 2865 HeapRegion* r = g1_policy()->collection_set(); | |
| 2866 while (r != NULL) { | |
| 2867 HeapRegion* next = r->next_in_collection_set(); | |
| 2868 if (cl->doHeapRegion(r)) { | |
| 2869 cl->incomplete(); | |
| 2870 return; | |
| 2871 } | |
| 2872 r = next; | |
| 2873 } | |
| 2874 } | |
| 2875 | |
| 2876 void G1CollectedHeap::collection_set_iterate_from(HeapRegion* r, | |
| 2877 HeapRegionClosure *cl) { | |
|
1656
4e5661ba9d98
6944166: G1: explicit GCs are not always handled correctly
tonyp
parents:
1611
diff
changeset
|
2878 if (r == NULL) { |
|
4e5661ba9d98
6944166: G1: explicit GCs are not always handled correctly
tonyp
parents:
1611
diff
changeset
|
2879 // 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
|
2880 return; |
|
4e5661ba9d98
6944166: G1: explicit GCs are not always handled correctly
tonyp
parents:
1611
diff
changeset
|
2881 } |
|
4e5661ba9d98
6944166: G1: explicit GCs are not always handled correctly
tonyp
parents:
1611
diff
changeset
|
2882 |
| 342 | 2883 assert(r->in_collection_set(), |
| 2884 "Start region must be a member of the collection set."); | |
| 2885 HeapRegion* cur = r; | |
| 2886 while (cur != NULL) { | |
| 2887 HeapRegion* next = cur->next_in_collection_set(); | |
| 2888 if (cl->doHeapRegion(cur) && false) { | |
| 2889 cl->incomplete(); | |
| 2890 return; | |
| 2891 } | |
| 2892 cur = next; | |
| 2893 } | |
| 2894 cur = g1_policy()->collection_set(); | |
| 2895 while (cur != r) { | |
| 2896 HeapRegion* next = cur->next_in_collection_set(); | |
| 2897 if (cl->doHeapRegion(cur) && false) { | |
| 2898 cl->incomplete(); | |
| 2899 return; | |
| 2900 } | |
| 2901 cur = next; | |
| 2902 } | |
| 2903 } | |
| 2904 | |
| 2905 CompactibleSpace* G1CollectedHeap::first_compactible_space() { | |
| 3766 | 2906 return n_regions() > 0 ? region_at(0) : NULL; |
| 342 | 2907 } |
| 2908 | |
| 2909 | |
| 2910 Space* G1CollectedHeap::space_containing(const void* addr) const { | |
| 2911 Space* res = heap_region_containing(addr); | |
| 2912 if (res == NULL) | |
| 2913 res = perm_gen()->space_containing(addr); | |
| 2914 return res; | |
| 2915 } | |
| 2916 | |
| 2917 HeapWord* G1CollectedHeap::block_start(const void* addr) const { | |
| 2918 Space* sp = space_containing(addr); | |
| 2919 if (sp != NULL) { | |
| 2920 return sp->block_start(addr); | |
| 2921 } | |
| 2922 return NULL; | |
| 2923 } | |
| 2924 | |
| 2925 size_t G1CollectedHeap::block_size(const HeapWord* addr) const { | |
| 2926 Space* sp = space_containing(addr); | |
| 2927 assert(sp != NULL, "block_size of address outside of heap"); | |
| 2928 return sp->block_size(addr); | |
| 2929 } | |
| 2930 | |
| 2931 bool G1CollectedHeap::block_is_obj(const HeapWord* addr) const { | |
| 2932 Space* sp = space_containing(addr); | |
| 2933 return sp->block_is_obj(addr); | |
| 2934 } | |
| 2935 | |
| 2936 bool G1CollectedHeap::supports_tlab_allocation() const { | |
| 2937 return true; | |
| 2938 } | |
| 2939 | |
| 2940 size_t G1CollectedHeap::tlab_capacity(Thread* ignored) const { | |
| 2941 return HeapRegion::GrainBytes; | |
| 2942 } | |
| 2943 | |
| 2944 size_t G1CollectedHeap::unsafe_max_tlab_alloc(Thread* ignored) const { | |
| 2945 // Return the remaining space in the cur alloc region, but not less than | |
| 2946 // the min TLAB size. | |
|
1313
664ae0c5e0e5
6755988: G1: assert(new_obj != 0 || ... "should be forwarded")
johnc
parents:
1282
diff
changeset
|
2947 |
|
664ae0c5e0e5
6755988: G1: assert(new_obj != 0 || ... "should be forwarded")
johnc
parents:
1282
diff
changeset
|
2948 // 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
|
2949 // 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
|
2950 // humongous objects. |
|
664ae0c5e0e5
6755988: G1: assert(new_obj != 0 || ... "should be forwarded")
johnc
parents:
1282
diff
changeset
|
2951 |
|
2433
abdfc822206f
7023069: G1: Introduce symmetric locking in the slow allocation path
tonyp
parents:
2432
diff
changeset
|
2952 HeapRegion* hr = _mutator_alloc_region.get(); |
|
1313
664ae0c5e0e5
6755988: G1: assert(new_obj != 0 || ... "should be forwarded")
johnc
parents:
1282
diff
changeset
|
2953 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
|
2954 if (hr == NULL) { |
|
1313
664ae0c5e0e5
6755988: G1: assert(new_obj != 0 || ... "should be forwarded")
johnc
parents:
1282
diff
changeset
|
2955 return max_tlab_size; |
| 342 | 2956 } else { |
|
2433
abdfc822206f
7023069: G1: Introduce symmetric locking in the slow allocation path
tonyp
parents:
2432
diff
changeset
|
2957 return MIN2(MAX2(hr->free(), (size_t) MinTLABSize), max_tlab_size); |
| 342 | 2958 } |
| 2959 } | |
| 2960 | |
| 2961 size_t G1CollectedHeap::max_capacity() const { | |
|
2188
c33825b68624
6923430: G1: assert(res != 0,"This should have worked.")
johnc
parents:
2173
diff
changeset
|
2962 return _g1_reserved.byte_size(); |
| 342 | 2963 } |
| 2964 | |
| 2965 jlong G1CollectedHeap::millis_since_last_gc() { | |
| 2966 // assert(false, "NYI"); | |
| 2967 return 0; | |
| 2968 } | |
| 2969 | |
| 2970 void G1CollectedHeap::prepare_for_verify() { | |
| 2971 if (SafepointSynchronize::is_at_safepoint() || ! UseTLAB) { | |
| 2972 ensure_parsability(false); | |
| 2973 } | |
| 2974 g1_rem_set()->prepare_for_verify(); | |
| 2975 } | |
| 2976 | |
| 2977 class VerifyLivenessOopClosure: public OopClosure { | |
|
3772
6747fd0512e0
7004681: G1: Extend marking verification to Full GCs
johnc
parents:
3766
diff
changeset
|
2978 G1CollectedHeap* _g1h; |
|
6747fd0512e0
7004681: G1: Extend marking verification to Full GCs
johnc
parents:
3766
diff
changeset
|
2979 VerifyOption _vo; |
| 342 | 2980 public: |
|
3772
6747fd0512e0
7004681: G1: Extend marking verification to Full GCs
johnc
parents:
3766
diff
changeset
|
2981 VerifyLivenessOopClosure(G1CollectedHeap* g1h, VerifyOption vo): |
|
6747fd0512e0
7004681: G1: Extend marking verification to Full GCs
johnc
parents:
3766
diff
changeset
|
2982 _g1h(g1h), _vo(vo) |
|
6747fd0512e0
7004681: G1: Extend marking verification to Full GCs
johnc
parents:
3766
diff
changeset
|
2983 { } |
|
845
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
ysr
parents:
838
diff
changeset
|
2984 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
|
2985 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
|
2986 |
|
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
ysr
parents:
838
diff
changeset
|
2987 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
|
2988 oop obj = oopDesc::load_decode_heap_oop(p); |
|
3772
6747fd0512e0
7004681: G1: Extend marking verification to Full GCs
johnc
parents:
3766
diff
changeset
|
2989 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
|
2990 "Dead object referenced by a not dead object"); |
| 342 | 2991 } |
| 2992 }; | |
| 2993 | |
| 2994 class VerifyObjsInRegionClosure: public ObjectClosure { | |
| 811 | 2995 private: |
| 342 | 2996 G1CollectedHeap* _g1h; |
| 2997 size_t _live_bytes; | |
| 2998 HeapRegion *_hr; | |
|
3772
6747fd0512e0
7004681: G1: Extend marking verification to Full GCs
johnc
parents:
3766
diff
changeset
|
2999 VerifyOption _vo; |
| 342 | 3000 public: |
|
3772
6747fd0512e0
7004681: G1: Extend marking verification to Full GCs
johnc
parents:
3766
diff
changeset
|
3001 // _vo == UsePrevMarking -> use "prev" marking information, |
|
6747fd0512e0
7004681: G1: Extend marking verification to Full GCs
johnc
parents:
3766
diff
changeset
|
3002 // _vo == UseNextMarking -> use "next" marking information, |
|
6747fd0512e0
7004681: G1: Extend marking verification to Full GCs
johnc
parents:
3766
diff
changeset
|
3003 // _vo == UseMarkWord -> use mark word from object header. |
|
6747fd0512e0
7004681: G1: Extend marking verification to Full GCs
johnc
parents:
3766
diff
changeset
|
3004 VerifyObjsInRegionClosure(HeapRegion *hr, VerifyOption vo) |
|
6747fd0512e0
7004681: G1: Extend marking verification to Full GCs
johnc
parents:
3766
diff
changeset
|
3005 : _live_bytes(0), _hr(hr), _vo(vo) { |
| 342 | 3006 _g1h = G1CollectedHeap::heap(); |
| 3007 } | |
| 3008 void do_object(oop o) { | |
|
3772
6747fd0512e0
7004681: G1: Extend marking verification to Full GCs
johnc
parents:
3766
diff
changeset
|
3009 VerifyLivenessOopClosure isLive(_g1h, _vo); |
| 342 | 3010 assert(o != NULL, "Huh?"); |
|
3772
6747fd0512e0
7004681: G1: Extend marking verification to Full GCs
johnc
parents:
3766
diff
changeset
|
3011 if (!_g1h->is_obj_dead_cond(o, _vo)) { |
|
6747fd0512e0
7004681: G1: Extend marking verification to Full GCs
johnc
parents:
3766
diff
changeset
|
3012 // If the object is alive according to the mark word, |
|
6747fd0512e0
7004681: G1: Extend marking verification to Full GCs
johnc
parents:
3766
diff
changeset
|
3013 // then verify that the marking information agrees. |
|
6747fd0512e0
7004681: G1: Extend marking verification to Full GCs
johnc
parents:
3766
diff
changeset
|
3014 // Note we can't verify the contra-positive of the |
|
6747fd0512e0
7004681: G1: Extend marking verification to Full GCs
johnc
parents:
3766
diff
changeset
|
3015 // above: if the object is dead (according to the mark |
|
6747fd0512e0
7004681: G1: Extend marking verification to Full GCs
johnc
parents:
3766
diff
changeset
|
3016 // 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
|
3017 // but has since became dead, or may have been allocated |
|
6747fd0512e0
7004681: G1: Extend marking verification to Full GCs
johnc
parents:
3766
diff
changeset
|
3018 // since the last marking. |
|
6747fd0512e0
7004681: G1: Extend marking verification to Full GCs
johnc
parents:
3766
diff
changeset
|
3019 if (_vo == VerifyOption_G1UseMarkWord) { |
|
6747fd0512e0
7004681: G1: Extend marking verification to Full GCs
johnc
parents:
3766
diff
changeset
|
3020 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
|
3021 } |
|
6747fd0512e0
7004681: G1: Extend marking verification to Full GCs
johnc
parents:
3766
diff
changeset
|
3022 |
| 342 | 3023 o->oop_iterate(&isLive); |
|
1389
5dbd9300cf9c
6943926: G1: Integer overflow during heap region verification
johnc
parents:
1388
diff
changeset
|
3024 if (!_hr->obj_allocated_since_prev_marking(o)) { |
|
5dbd9300cf9c
6943926: G1: Integer overflow during heap region verification
johnc
parents:
1388
diff
changeset
|
3025 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
|
3026 _live_bytes += (obj_size * HeapWordSize); |
|
5dbd9300cf9c
6943926: G1: Integer overflow during heap region verification
johnc
parents:
1388
diff
changeset
|
3027 } |
| 342 | 3028 } |
| 3029 } | |
| 3030 size_t live_bytes() { return _live_bytes; } | |
| 3031 }; | |
| 3032 | |
| 3033 class PrintObjsInRegionClosure : public ObjectClosure { | |
| 3034 HeapRegion *_hr; | |
| 3035 G1CollectedHeap *_g1; | |
| 3036 public: | |
| 3037 PrintObjsInRegionClosure(HeapRegion *hr) : _hr(hr) { | |
| 3038 _g1 = G1CollectedHeap::heap(); | |
| 3039 }; | |
| 3040 | |
| 3041 void do_object(oop o) { | |
| 3042 if (o != NULL) { | |
| 3043 HeapWord *start = (HeapWord *) o; | |
| 3044 size_t word_sz = o->size(); | |
| 3045 gclog_or_tty->print("\nPrinting obj "PTR_FORMAT" of size " SIZE_FORMAT | |
| 3046 " isMarkedPrev %d isMarkedNext %d isAllocSince %d\n", | |
| 3047 (void*) o, word_sz, | |
| 3048 _g1->isMarkedPrev(o), | |
| 3049 _g1->isMarkedNext(o), | |
| 3050 _hr->obj_allocated_since_prev_marking(o)); | |
| 3051 HeapWord *end = start + word_sz; | |
| 3052 HeapWord *cur; | |
| 3053 int *val; | |
| 3054 for (cur = start; cur < end; cur++) { | |
| 3055 val = (int *) cur; | |
| 3056 gclog_or_tty->print("\t "PTR_FORMAT":"PTR_FORMAT"\n", val, *val); | |
| 3057 } | |
| 3058 } | |
| 3059 } | |
| 3060 }; | |
| 3061 | |
| 3062 class VerifyRegionClosure: public HeapRegionClosure { | |
| 811 | 3063 private: |
|
3772
6747fd0512e0
7004681: G1: Extend marking verification to Full GCs
johnc
parents:
3766
diff
changeset
|
3064 bool _par; |
|
6747fd0512e0
7004681: G1: Extend marking verification to Full GCs
johnc
parents:
3766
diff
changeset
|
3065 VerifyOption _vo; |
|
6747fd0512e0
7004681: G1: Extend marking verification to Full GCs
johnc
parents:
3766
diff
changeset
|
3066 bool _failures; |
| 811 | 3067 public: |
|
3772
6747fd0512e0
7004681: G1: Extend marking verification to Full GCs
johnc
parents:
3766
diff
changeset
|
3068 // _vo == UsePrevMarking -> use "prev" marking information, |
|
6747fd0512e0
7004681: G1: Extend marking verification to Full GCs
johnc
parents:
3766
diff
changeset
|
3069 // _vo == UseNextMarking -> use "next" marking information, |
|
6747fd0512e0
7004681: G1: Extend marking verification to Full GCs
johnc
parents:
3766
diff
changeset
|
3070 // _vo == UseMarkWord -> use mark word from object header. |
| 6008 | 3071 VerifyRegionClosure(bool par, VerifyOption vo) |
| 3072 : _par(par), | |
|
3772
6747fd0512e0
7004681: G1: Extend marking verification to Full GCs
johnc
parents:
3766
diff
changeset
|
3073 _vo(vo), |
|
1020
ff2402f6a50b
6882730: G1: parallel heap verification messes up region dump
tonyp
parents:
1019
diff
changeset
|
3074 _failures(false) {} |
|
ff2402f6a50b
6882730: G1: parallel heap verification messes up region dump
tonyp
parents:
1019
diff
changeset
|
3075 |
|
ff2402f6a50b
6882730: G1: parallel heap verification messes up region dump
tonyp
parents:
1019
diff
changeset
|
3076 bool failures() { |
|
ff2402f6a50b
6882730: G1: parallel heap verification messes up region dump
tonyp
parents:
1019
diff
changeset
|
3077 return _failures; |
|
ff2402f6a50b
6882730: G1: parallel heap verification messes up region dump
tonyp
parents:
1019
diff
changeset
|
3078 } |
|
845
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
ysr
parents:
838
diff
changeset
|
3079 |
| 342 | 3080 bool doHeapRegion(HeapRegion* r) { |
| 390 | 3081 guarantee(_par || r->claim_value() == HeapRegion::InitialClaimValue, |
| 3082 "Should be unclaimed at verify points."); | |
|
637
25e146966e7c
6817419: G1: Enable extensive verification for humongous regions
iveresov
parents:
636
diff
changeset
|
3083 if (!r->continuesHumongous()) { |
|
1020
ff2402f6a50b
6882730: G1: parallel heap verification messes up region dump
tonyp
parents:
1019
diff
changeset
|
3084 bool failures = false; |
| 6008 | 3085 r->verify(_vo, &failures); |
|
1020
ff2402f6a50b
6882730: G1: parallel heap verification messes up region dump
tonyp
parents:
1019
diff
changeset
|
3086 if (failures) { |
|
ff2402f6a50b
6882730: G1: parallel heap verification messes up region dump
tonyp
parents:
1019
diff
changeset
|
3087 _failures = true; |
|
ff2402f6a50b
6882730: G1: parallel heap verification messes up region dump
tonyp
parents:
1019
diff
changeset
|
3088 } else { |
|
3772
6747fd0512e0
7004681: G1: Extend marking verification to Full GCs
johnc
parents:
3766
diff
changeset
|
3089 VerifyObjsInRegionClosure not_dead_yet_cl(r, _vo); |
|
1020
ff2402f6a50b
6882730: G1: parallel heap verification messes up region dump
tonyp
parents:
1019
diff
changeset
|
3090 r->object_iterate(¬_dead_yet_cl); |
|
4787
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
4785
diff
changeset
|
3091 if (_vo != VerifyOption_G1UseNextMarking) { |
|
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
4785
diff
changeset
|
3092 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
|
3093 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
|
3094 "max_live_bytes "SIZE_FORMAT" " |
|
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
4785
diff
changeset
|
3095 "< calculated "SIZE_FORMAT, |
|
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|
3096 r->bottom(), r->end(), |
|
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|
3097 r->max_live_bytes(), |
|
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|
3098 not_dead_yet_cl.live_bytes()); |
|
4787
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|
3099 _failures = true; |
|
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|
3100 } |
|
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|
3101 } else { |
|
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|
3102 // When vo == UseNextMarking we cannot currently do a sanity |
|
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|
3103 // check on the live bytes as the calculation has not been |
|
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|
3104 // finalized yet. |
|
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|
3105 } |
|
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|
3106 } |
| 342 | 3107 } |
|
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|
3108 return false; // stop the region iteration if we hit a failure |
| 342 | 3109 } |
| 3110 }; | |
| 3111 | |
| 3112 class VerifyRootsClosure: public OopsInGenClosure { | |
| 3113 private: | |
| 3114 G1CollectedHeap* _g1h; | |
|
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|
3115 VerifyOption _vo; |
| 342 | 3116 bool _failures; |
| 3117 public: | |
|
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3118 // _vo == UsePrevMarking -> use "prev" marking information, |
|
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3119 // _vo == UseNextMarking -> use "next" marking information, |
|
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|
3120 // _vo == UseMarkWord -> use mark word from object header. |
|
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|
3121 VerifyRootsClosure(VerifyOption vo) : |
|
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3122 _g1h(G1CollectedHeap::heap()), |
|
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|
3123 _vo(vo), |
|
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|
3124 _failures(false) { } |
| 342 | 3125 |
| 3126 bool failures() { return _failures; } | |
| 3127 | |
|
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|
3128 template <class T> void do_oop_nv(T* p) { |
|
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|
3129 T heap_oop = oopDesc::load_heap_oop(p); |
|
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|
3130 if (!oopDesc::is_null(heap_oop)) { |
|
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|
3131 oop obj = oopDesc::decode_heap_oop_not_null(heap_oop); |
|
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|
3132 if (_g1h->is_obj_dead_cond(obj, _vo)) { |
| 342 | 3133 gclog_or_tty->print_cr("Root location "PTR_FORMAT" " |
|
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|
3134 "points to dead obj "PTR_FORMAT, p, (void*) obj); |
|
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|
3135 if (_vo == VerifyOption_G1UseMarkWord) { |
|
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|
3136 gclog_or_tty->print_cr(" Mark word: "PTR_FORMAT, (void*)(obj->mark())); |
|
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|
3137 } |
| 342 | 3138 obj->print_on(gclog_or_tty); |
| 3139 _failures = true; | |
| 3140 } | |
| 3141 } | |
| 3142 } | |
|
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|
3143 |
|
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|
3144 void do_oop(oop* p) { do_oop_nv(p); } |
|
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|
3145 void do_oop(narrowOop* p) { do_oop_nv(p); } |
| 342 | 3146 }; |
| 3147 | |
| 390 | 3148 // This is the task used for parallel heap verification. |
| 3149 | |
| 3150 class G1ParVerifyTask: public AbstractGangTask { | |
| 3151 private: | |
| 3152 G1CollectedHeap* _g1h; | |
|
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|
3153 VerifyOption _vo; |
|
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|
3154 bool _failures; |
| 390 | 3155 |
| 3156 public: | |
|
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|
3157 // _vo == UsePrevMarking -> use "prev" marking information, |
|
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|
3158 // _vo == UseNextMarking -> use "next" marking information, |
|
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|
3159 // _vo == UseMarkWord -> use mark word from object header. |
| 6008 | 3160 G1ParVerifyTask(G1CollectedHeap* g1h, VerifyOption vo) : |
| 390 | 3161 AbstractGangTask("Parallel verify task"), |
|
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|
3162 _g1h(g1h), |
|
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|
3163 _vo(vo), |
|
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|
3164 _failures(false) { } |
|
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|
3165 |
|
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|
3166 bool failures() { |
|
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|
3167 return _failures; |
|
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|
3168 } |
| 390 | 3169 |
|
4728
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|
3170 void work(uint worker_id) { |
|
637
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6817419: G1: Enable extensive verification for humongous regions
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parents:
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diff
changeset
|
3171 HandleMark hm; |
| 6008 | 3172 VerifyRegionClosure blk(true, _vo); |
|
4728
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|
3173 _g1h->heap_region_par_iterate_chunked(&blk, worker_id, |
|
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|
3174 _g1h->workers()->active_workers(), |
| 390 | 3175 HeapRegion::ParVerifyClaimValue); |
|
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|
3176 if (blk.failures()) { |
|
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|
3177 _failures = true; |
|
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|
3178 } |
| 390 | 3179 } |
| 3180 }; | |
| 3181 | |
| 6008 | 3182 void G1CollectedHeap::verify(bool silent) { |
| 3183 verify(silent, VerifyOption_G1UsePrevMarking); | |
| 3184 } | |
| 3185 | |
| 3186 void G1CollectedHeap::verify(bool silent, | |
|
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|
3187 VerifyOption vo) { |
| 342 | 3188 if (SafepointSynchronize::is_at_safepoint() || ! UseTLAB) { |
|
3293
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|
3189 if (!silent) { gclog_or_tty->print("Roots (excluding permgen) "); } |
|
3772
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|
3190 VerifyRootsClosure rootsCl(vo); |
|
4095
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|
3191 |
|
bca17e38de00
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|
3192 assert(Thread::current()->is_VM_thread(), |
|
bca17e38de00
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|
3193 "Expected to be executed serially by the VM thread at this point"); |
|
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|
3194 |
|
989
148e5441d916
6863023: need non-perm oops in code cache for JSR 292
jrose
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890
diff
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|
3195 CodeBlobToOopClosure blobsCl(&rootsCl, /*do_marking=*/ false); |
|
3772
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|
3196 |
|
3293
1f4413413144
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changeset
|
3197 // We apply the relevant closures to all the oops in the |
|
1f4413413144
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3289
diff
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|
3198 // system dictionary, the string table and the code cache. |
|
4910
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7129892: G1: explicit marking cycle initiation might fail to initiate a marking cycle
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diff
changeset
|
3199 const int so = SO_AllClasses | SO_Strings | SO_CodeCache; |
|
3772
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|
3200 |
|
3293
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diff
changeset
|
3201 process_strong_roots(true, // activate StrongRootsScope |
|
1f4413413144
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diff
changeset
|
3202 true, // we set "collecting perm gen" to true, |
|
1f4413413144
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|
3203 // so we don't reset the dirty cards in the perm gen. |
|
4910
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|
3204 ScanningOption(so), // roots scanning options |
| 342 | 3205 &rootsCl, |
|
989
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6863023: need non-perm oops in code cache for JSR 292
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|
3206 &blobsCl, |
| 342 | 3207 &rootsCl); |
|
3772
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|
3208 |
|
6747fd0512e0
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changeset
|
3209 // If we're verifying after the marking phase of a Full GC then we can't |
|
6747fd0512e0
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|
3210 // treat the perm gen as roots into the G1 heap. Some of the objects in |
|
6747fd0512e0
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changeset
|
3211 // the perm gen may be dead and hence not marked. If one of these dead |
|
6747fd0512e0
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changeset
|
3212 // objects is considered to be a root then we may end up with a false |
|
6747fd0512e0
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|
3213 // "Root location <x> points to dead ob <y>" failure. |
|
6747fd0512e0
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changeset
|
3214 if (vo != VerifyOption_G1UseMarkWord) { |
|
6747fd0512e0
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changeset
|
3215 // Since we used "collecting_perm_gen" == true above, we will not have |
|
6747fd0512e0
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changeset
|
3216 // checked the refs from perm into the G1-collected heap. We check those |
|
6747fd0512e0
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|
3217 // references explicitly below. Whether the relevant cards are dirty |
|
6747fd0512e0
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|
3218 // is checked further below in the rem set verification. |
|
6747fd0512e0
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changeset
|
3219 if (!silent) { gclog_or_tty->print("Permgen roots "); } |
|
6747fd0512e0
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|
3220 perm_gen()->oop_iterate(&rootsCl); |
|
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|
3221 } |
|
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|
3222 bool failures = rootsCl.failures(); |
|
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|
3223 |
|
6747fd0512e0
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changeset
|
3224 if (vo != VerifyOption_G1UseMarkWord) { |
|
6747fd0512e0
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|
3225 // If we're verifying during a full GC then the region sets |
|
6747fd0512e0
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changeset
|
3226 // will have been torn down at the start of the GC. Therefore |
|
6747fd0512e0
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changeset
|
3227 // verifying the region sets will fail. So we only verify |
|
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|
3228 // the region sets when not in a full GC. |
|
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|
3229 if (!silent) { gclog_or_tty->print("HeapRegionSets "); } |
|
6747fd0512e0
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3766
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|
3230 verify_region_sets(); |
|
6747fd0512e0
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3766
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|
3231 } |
|
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|
3232 |
| 2152 | 3233 if (!silent) { gclog_or_tty->print("HeapRegions "); } |
| 390 | 3234 if (GCParallelVerificationEnabled && ParallelGCThreads > 1) { |
| 3235 assert(check_heap_region_claim_values(HeapRegion::InitialClaimValue), | |
| 3236 "sanity check"); | |
| 3237 | |
| 6008 | 3238 G1ParVerifyTask task(this, vo); |
|
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|
3239 assert(UseDynamicNumberOfGCThreads || |
|
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|
3240 workers()->active_workers() == workers()->total_workers(), |
|
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|
3241 "If not dynamic should be using all the workers"); |
|
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|
3242 int n_workers = workers()->active_workers(); |
| 390 | 3243 set_par_threads(n_workers); |
| 3244 workers()->run_task(&task); | |
| 3245 set_par_threads(0); | |
|
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|
3246 if (task.failures()) { |
|
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|
3247 failures = true; |
|
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|
3248 } |
| 390 | 3249 |
|
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|
3250 // Checks that the expected amount of parallel work was done. |
|
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|
3251 // The implication is that n_workers is > 0. |
| 390 | 3252 assert(check_heap_region_claim_values(HeapRegion::ParVerifyClaimValue), |
| 3253 "sanity check"); | |
| 3254 | |
| 3255 reset_heap_region_claim_values(); | |
| 3256 | |
| 3257 assert(check_heap_region_claim_values(HeapRegion::InitialClaimValue), | |
| 3258 "sanity check"); | |
| 3259 } else { | |
| 6008 | 3260 VerifyRegionClosure blk(false, vo); |
| 3766 | 3261 heap_region_iterate(&blk); |
|
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|
3262 if (blk.failures()) { |
|
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|
3263 failures = true; |
|
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|
3264 } |
| 390 | 3265 } |
| 2152 | 3266 if (!silent) gclog_or_tty->print("RemSet "); |
| 342 | 3267 rem_set()->verify(); |
|
1020
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|
3268 |
|
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|
3269 if (failures) { |
|
ff2402f6a50b
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|
3270 gclog_or_tty->print_cr("Heap:"); |
|
4073
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|
3271 // It helps to have the per-region information in the output to |
|
53074c2c4600
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|
3272 // help us track down what went wrong. This is why we call |
|
53074c2c4600
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|
3273 // print_extended_on() instead of print_on(). |
|
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|
3274 print_extended_on(gclog_or_tty); |
|
1020
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|
3275 gclog_or_tty->print_cr(""); |
|
1547
fb1a39993f69
6951319: enable solaris builds using Sun Studio 12 update 1
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|
3276 #ifndef PRODUCT |
| 1044 | 3277 if (VerifyDuringGC && G1VerifyDuringGCPrintReachable) { |
| 1388 | 3278 concurrent_mark()->print_reachable("at-verification-failure", |
|
3772
6747fd0512e0
7004681: G1: Extend marking verification to Full GCs
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|
3279 vo, false /* all */); |
|
1020
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|
3280 } |
|
1547
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|
3281 #endif |
|
1020
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|
3282 gclog_or_tty->flush(); |
|
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|
3283 } |
|
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|
3284 guarantee(!failures, "there should not have been any failures"); |
| 342 | 3285 } else { |
| 3286 if (!silent) gclog_or_tty->print("(SKIPPING roots, heapRegions, remset) "); | |
| 3287 } | |
| 3288 } | |
| 3289 | |
| 3290 class PrintRegionClosure: public HeapRegionClosure { | |
| 3291 outputStream* _st; | |
| 3292 public: | |
| 3293 PrintRegionClosure(outputStream* st) : _st(st) {} | |
| 3294 bool doHeapRegion(HeapRegion* r) { | |
| 3295 r->print_on(_st); | |
| 3296 return false; | |
| 3297 } | |
| 3298 }; | |
| 3299 | |
| 3300 void G1CollectedHeap::print_on(outputStream* st) const { | |
|
838
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|
3301 st->print(" %-20s", "garbage-first heap"); |
|
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|
3302 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")
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|
3303 capacity()/K, used_unlocked()/K); |
|
838
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|
3304 st->print(" [" INTPTR_FORMAT ", " INTPTR_FORMAT ", " INTPTR_FORMAT ")", |
|
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|
3305 _g1_storage.low_boundary(), |
|
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|
3306 _g1_storage.high(), |
|
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|
3307 _g1_storage.high_boundary()); |
|
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|
3308 st->cr(); |
|
3986
65a8ff39a6da
7095194: G1: HeapRegion::GrainBytes, GrainWords, and CardsPerRegion should be size_t
johnc
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changeset
|
3309 st->print(" region size " SIZE_FORMAT "K, ", HeapRegion::GrainBytes / K); |
|
6010
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|
3310 uint young_regions = _young_list->length(); |
|
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|
3311 st->print("%u young (" SIZE_FORMAT "K), ", young_regions, |
|
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|
3312 (size_t) young_regions * HeapRegion::GrainBytes / K); |
|
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|
3313 uint survivor_regions = g1_policy()->recorded_survivor_regions(); |
|
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|
3314 st->print("%u survivors (" SIZE_FORMAT "K)", survivor_regions, |
|
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|
3315 (size_t) survivor_regions * HeapRegion::GrainBytes / K); |
|
838
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|
3316 st->cr(); |
|
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|
3317 perm()->as_gen()->print_on(st); |
|
4073
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|
3318 } |
|
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|
3319 |
|
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|
3320 void G1CollectedHeap::print_extended_on(outputStream* st) const { |
|
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|
3321 print_on(st); |
|
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|
3322 |
|
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|
3323 // Print the per-region information. |
|
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|
3324 st->cr(); |
|
6010
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|
3325 st->print_cr("Heap Regions: (Y=young(eden), SU=young(survivor), " |
|
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|
3326 "HS=humongous(starts), HC=humongous(continues), " |
|
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|
3327 "CS=collection set, F=free, TS=gc time stamp, " |
|
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|
3328 "PTAMS=previous top-at-mark-start, " |
|
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|
3329 "NTAMS=next top-at-mark-start)"); |
| 342 | 3330 PrintRegionClosure blk(st); |
| 3766 | 3331 heap_region_iterate(&blk); |
| 342 | 3332 } |
| 3333 | |
| 3334 void G1CollectedHeap::print_gc_threads_on(outputStream* st) const { | |
|
1833
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6984287: Regularize how GC parallel workers are specified.
jmasa
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diff
changeset
|
3335 if (G1CollectedHeap::use_parallel_gc_threads()) { |
| 1019 | 3336 workers()->print_worker_threads_on(st); |
| 3337 } | |
| 3338 _cmThread->print_on(st); | |
| 342 | 3339 st->cr(); |
| 1019 | 3340 _cm->print_worker_threads_on(st); |
| 3341 _cg1r->print_worker_threads_on(st); | |
| 342 | 3342 st->cr(); |
| 3343 } | |
| 3344 | |
| 3345 void G1CollectedHeap::gc_threads_do(ThreadClosure* tc) const { | |
|
1833
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|
3346 if (G1CollectedHeap::use_parallel_gc_threads()) { |
| 342 | 3347 workers()->threads_do(tc); |
| 3348 } | |
| 3349 tc->do_thread(_cmThread); | |
| 794 | 3350 _cg1r->threads_do(tc); |
| 342 | 3351 } |
| 3352 | |
| 3353 void G1CollectedHeap::print_tracing_info() const { | |
| 3354 // We'll overload this to mean "trace GC pause statistics." | |
| 3355 if (TraceGen0Time || TraceGen1Time) { | |
| 3356 // The "G1CollectorPolicy" is keeping track of these stats, so delegate | |
| 3357 // to that. | |
| 3358 g1_policy()->print_tracing_info(); | |
| 3359 } | |
| 751 | 3360 if (G1SummarizeRSetStats) { |
| 342 | 3361 g1_rem_set()->print_summary_info(); |
| 3362 } | |
| 1282 | 3363 if (G1SummarizeConcMark) { |
| 342 | 3364 concurrent_mark()->print_summary_info(); |
| 3365 } | |
| 3366 g1_policy()->print_yg_surv_rate_info(); | |
| 3367 SpecializationStats::print(); | |
| 3368 } | |
| 3369 | |
|
3777
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|
3370 #ifndef PRODUCT |
|
e8b0b0392037
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|
3371 // Helpful for debugging RSet issues. |
|
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changeset
|
3372 |
|
e8b0b0392037
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|
3373 class PrintRSetsClosure : public HeapRegionClosure { |
|
e8b0b0392037
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changeset
|
3374 private: |
|
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changeset
|
3375 const char* _msg; |
|
e8b0b0392037
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changeset
|
3376 size_t _occupied_sum; |
|
e8b0b0392037
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changeset
|
3377 |
|
e8b0b0392037
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changeset
|
3378 public: |
|
e8b0b0392037
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changeset
|
3379 bool doHeapRegion(HeapRegion* r) { |
|
e8b0b0392037
7046182: G1: remove unnecessary iterations over the collection set
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diff
changeset
|
3380 HeapRegionRemSet* hrrs = r->rem_set(); |
|
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changeset
|
3381 size_t occupied = hrrs->occupied(); |
|
e8b0b0392037
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diff
changeset
|
3382 _occupied_sum += occupied; |
|
e8b0b0392037
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changeset
|
3383 |
|
e8b0b0392037
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changeset
|
3384 gclog_or_tty->print_cr("Printing RSet for region "HR_FORMAT, |
|
e8b0b0392037
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diff
changeset
|
3385 HR_FORMAT_PARAMS(r)); |
|
e8b0b0392037
7046182: G1: remove unnecessary iterations over the collection set
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diff
changeset
|
3386 if (occupied == 0) { |
|
e8b0b0392037
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diff
changeset
|
3387 gclog_or_tty->print_cr(" RSet is empty"); |
|
e8b0b0392037
7046182: G1: remove unnecessary iterations over the collection set
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diff
changeset
|
3388 } else { |
|
e8b0b0392037
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diff
changeset
|
3389 hrrs->print(); |
|
e8b0b0392037
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diff
changeset
|
3390 } |
|
e8b0b0392037
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changeset
|
3391 gclog_or_tty->print_cr("----------"); |
|
e8b0b0392037
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changeset
|
3392 return false; |
|
e8b0b0392037
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diff
changeset
|
3393 } |
|
e8b0b0392037
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changeset
|
3394 |
|
e8b0b0392037
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changeset
|
3395 PrintRSetsClosure(const char* msg) : _msg(msg), _occupied_sum(0) { |
|
e8b0b0392037
7046182: G1: remove unnecessary iterations over the collection set
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changeset
|
3396 gclog_or_tty->cr(); |
|
e8b0b0392037
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changeset
|
3397 gclog_or_tty->print_cr("========================================"); |
|
e8b0b0392037
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changeset
|
3398 gclog_or_tty->print_cr(msg); |
|
e8b0b0392037
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changeset
|
3399 gclog_or_tty->cr(); |
|
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changeset
|
3400 } |
|
e8b0b0392037
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|
3401 |
|
e8b0b0392037
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|
3402 ~PrintRSetsClosure() { |
|
e8b0b0392037
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changeset
|
3403 gclog_or_tty->print_cr("Occupied Sum: "SIZE_FORMAT, _occupied_sum); |
|
e8b0b0392037
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changeset
|
3404 gclog_or_tty->print_cr("========================================"); |
|
e8b0b0392037
7046182: G1: remove unnecessary iterations over the collection set
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changeset
|
3405 gclog_or_tty->cr(); |
|
e8b0b0392037
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changeset
|
3406 } |
|
e8b0b0392037
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|
3407 }; |
|
e8b0b0392037
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|
3408 |
|
e8b0b0392037
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|
3409 void G1CollectedHeap::print_cset_rsets() { |
|
e8b0b0392037
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changeset
|
3410 PrintRSetsClosure cl("Printing CSet RSets"); |
|
e8b0b0392037
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diff
changeset
|
3411 collection_set_iterate(&cl); |
|
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changeset
|
3412 } |
|
e8b0b0392037
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|
3413 |
|
e8b0b0392037
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|
3414 void G1CollectedHeap::print_all_rsets() { |
|
e8b0b0392037
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changeset
|
3415 PrintRSetsClosure cl("Printing All RSets");; |
|
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diff
changeset
|
3416 heap_region_iterate(&cl); |
|
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|
3417 } |
|
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|
3418 #endif // PRODUCT |
|
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|
3419 |
| 342 | 3420 G1CollectedHeap* G1CollectedHeap::heap() { |
| 3421 assert(_sh->kind() == CollectedHeap::G1CollectedHeap, | |
| 3422 "not a garbage-first heap"); | |
| 3423 return _g1h; | |
| 3424 } | |
| 3425 | |
| 3426 void G1CollectedHeap::gc_prologue(bool full /* Ignored */) { | |
|
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diff
changeset
|
3427 // always_do_update_barrier = false; |
| 342 | 3428 assert(InlineCacheBuffer::is_empty(), "should have cleaned up ICBuffer"); |
| 3429 // Call allocation profiler | |
| 3430 AllocationProfiler::iterate_since_last_gc(); | |
| 3431 // Fill TLAB's and such | |
| 3432 ensure_parsability(true); | |
| 3433 } | |
| 3434 | |
| 3435 void G1CollectedHeap::gc_epilogue(bool full /* Ignored */) { | |
| 3436 // FIXME: what is this about? | |
| 3437 // I'm ignoring the "fill_newgen()" call if "alloc_event_enabled" | |
| 3438 // is set. | |
| 3439 COMPILER2_PRESENT(assert(DerivedPointerTable::is_empty(), | |
| 3440 "derived pointer present")); | |
|
1245
6484c4ee11cb
6904516: More object array barrier fixes, following up on 6906727
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diff
changeset
|
3441 // always_do_update_barrier = true; |
|
3979
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3442 |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3443 // We have just completed a GC. Update the soft reference |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3444 // policy with the new heap occupancy |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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diff
changeset
|
3445 Universe::update_heap_info_at_gc(); |
| 342 | 3446 } |
| 3447 | |
| 1973 | 3448 HeapWord* G1CollectedHeap::do_collection_pause(size_t word_size, |
| 3449 unsigned int gc_count_before, | |
| 3450 bool* succeeded) { | |
| 3451 assert_heap_not_locked_and_not_at_safepoint(); | |
| 342 | 3452 g1_policy()->record_stop_world_start(); |
| 1973 | 3453 VM_G1IncCollectionPause op(gc_count_before, |
| 3454 word_size, | |
| 3455 false, /* should_initiate_conc_mark */ | |
| 3456 g1_policy()->max_pause_time_ms(), | |
| 3457 GCCause::_g1_inc_collection_pause); | |
| 3458 VMThread::execute(&op); | |
| 3459 | |
| 3460 HeapWord* result = op.result(); | |
| 3461 bool ret_succeeded = op.prologue_succeeded() && op.pause_succeeded(); | |
| 3462 assert(result == NULL || ret_succeeded, | |
| 3463 "the result should be NULL if the VM did not succeed"); | |
| 3464 *succeeded = ret_succeeded; | |
| 3465 | |
| 3466 assert_heap_not_locked(); | |
| 3467 return result; | |
| 342 | 3468 } |
| 3469 | |
| 3470 void | |
| 3471 G1CollectedHeap::doConcurrentMark() { | |
|
845
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
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diff
changeset
|
3472 MutexLockerEx x(CGC_lock, Mutex::_no_safepoint_check_flag); |
|
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
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diff
changeset
|
3473 if (!_cmThread->in_progress()) { |
|
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
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diff
changeset
|
3474 _cmThread->set_started(); |
|
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
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diff
changeset
|
3475 CGC_lock->notify(); |
| 342 | 3476 } |
| 3477 } | |
| 3478 | |
| 3479 size_t G1CollectedHeap::pending_card_num() { | |
| 3480 size_t extra_cards = 0; | |
| 3481 JavaThread *curr = Threads::first(); | |
| 3482 while (curr != NULL) { | |
| 3483 DirtyCardQueue& dcq = curr->dirty_card_queue(); | |
| 3484 extra_cards += dcq.size(); | |
| 3485 curr = curr->next(); | |
| 3486 } | |
| 3487 DirtyCardQueueSet& dcqs = JavaThread::dirty_card_queue_set(); | |
| 3488 size_t buffer_size = dcqs.buffer_size(); | |
| 3489 size_t buffer_num = dcqs.completed_buffers_num(); | |
| 3490 return buffer_size * buffer_num + extra_cards; | |
| 3491 } | |
| 3492 | |
| 3493 size_t G1CollectedHeap::max_pending_card_num() { | |
| 3494 DirtyCardQueueSet& dcqs = JavaThread::dirty_card_queue_set(); | |
| 3495 size_t buffer_size = dcqs.buffer_size(); | |
| 3496 size_t buffer_num = dcqs.completed_buffers_num(); | |
| 3497 int thread_num = Threads::number_of_threads(); | |
| 3498 return (buffer_num + thread_num) * buffer_size; | |
| 3499 } | |
| 3500 | |
| 3501 size_t G1CollectedHeap::cards_scanned() { | |
| 1861 | 3502 return g1_rem_set()->cardsScanned(); |
| 342 | 3503 } |
| 3504 | |
| 3505 void | |
| 3506 G1CollectedHeap::setup_surviving_young_words() { | |
|
6010
720b6a76dd9d
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diff
changeset
|
3507 assert(_surviving_young_words == NULL, "pre-condition"); |
|
720b6a76dd9d
7157073: G1: type change size_t -> uint for region counts / indexes
tonyp
parents:
6008
diff
changeset
|
3508 uint array_length = g1_policy()->young_cset_region_length(); |
|
720b6a76dd9d
7157073: G1: type change size_t -> uint for region counts / indexes
tonyp
parents:
6008
diff
changeset
|
3509 _surviving_young_words = NEW_C_HEAP_ARRAY(size_t, (size_t) array_length); |
| 342 | 3510 if (_surviving_young_words == NULL) { |
| 3511 vm_exit_out_of_memory(sizeof(size_t) * array_length, | |
| 3512 "Not enough space for young surv words summary."); | |
| 3513 } | |
|
6010
720b6a76dd9d
7157073: G1: type change size_t -> uint for region counts / indexes
tonyp
parents:
6008
diff
changeset
|
3514 memset(_surviving_young_words, 0, (size_t) array_length * sizeof(size_t)); |
|
845
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
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parents:
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diff
changeset
|
3515 #ifdef ASSERT |
|
6010
720b6a76dd9d
7157073: G1: type change size_t -> uint for region counts / indexes
tonyp
parents:
6008
diff
changeset
|
3516 for (uint i = 0; i < array_length; ++i) { |
|
845
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
ysr
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diff
changeset
|
3517 assert( _surviving_young_words[i] == 0, "memset above" ); |
|
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
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parents:
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diff
changeset
|
3518 } |
|
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
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parents:
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diff
changeset
|
3519 #endif // !ASSERT |
| 342 | 3520 } |
| 3521 | |
| 3522 void | |
| 3523 G1CollectedHeap::update_surviving_young_words(size_t* surv_young_words) { | |
| 3524 MutexLockerEx x(ParGCRareEvent_lock, Mutex::_no_safepoint_check_flag); | |
|
6010
720b6a76dd9d
7157073: G1: type change size_t -> uint for region counts / indexes
tonyp
parents:
6008
diff
changeset
|
3525 uint array_length = g1_policy()->young_cset_region_length(); |
|
720b6a76dd9d
7157073: G1: type change size_t -> uint for region counts / indexes
tonyp
parents:
6008
diff
changeset
|
3526 for (uint i = 0; i < array_length; ++i) { |
| 342 | 3527 _surviving_young_words[i] += surv_young_words[i]; |
|
6010
720b6a76dd9d
7157073: G1: type change size_t -> uint for region counts / indexes
tonyp
parents:
6008
diff
changeset
|
3528 } |
| 342 | 3529 } |
| 3530 | |
| 3531 void | |
| 3532 G1CollectedHeap::cleanup_surviving_young_words() { | |
| 3533 guarantee( _surviving_young_words != NULL, "pre-condition" ); | |
| 3534 FREE_C_HEAP_ARRAY(size_t, _surviving_young_words); | |
| 3535 _surviving_young_words = NULL; | |
| 3536 } | |
| 3537 | |
|
3777
e8b0b0392037
7046182: G1: remove unnecessary iterations over the collection set
tonyp
parents:
3774
diff
changeset
|
3538 #ifdef ASSERT |
|
e8b0b0392037
7046182: G1: remove unnecessary iterations over the collection set
tonyp
parents:
3774
diff
changeset
|
3539 class VerifyCSetClosure: public HeapRegionClosure { |
|
e8b0b0392037
7046182: G1: remove unnecessary iterations over the collection set
tonyp
parents:
3774
diff
changeset
|
3540 public: |
|
e8b0b0392037
7046182: G1: remove unnecessary iterations over the collection set
tonyp
parents:
3774
diff
changeset
|
3541 bool doHeapRegion(HeapRegion* hr) { |
|
e8b0b0392037
7046182: G1: remove unnecessary iterations over the collection set
tonyp
parents:
3774
diff
changeset
|
3542 // 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
|
3543 // iteration. The fields that we'll verify are only manipulated |
|
e8b0b0392037
7046182: G1: remove unnecessary iterations over the collection set
tonyp
parents:
3774
diff
changeset
|
3544 // when the region is part of a CSet and is collected. Afterwards, |
|
e8b0b0392037
7046182: G1: remove unnecessary iterations over the collection set
tonyp
parents:
3774
diff
changeset
|
3545 // we reset these fields when we clear the region's RSet (when the |
|
e8b0b0392037
7046182: G1: remove unnecessary iterations over the collection set
tonyp
parents:
3774
diff
changeset
|
3546 // region is freed) so they are ready when the region is |
|
e8b0b0392037
7046182: G1: remove unnecessary iterations over the collection set
tonyp
parents:
3774
diff
changeset
|
3547 // re-allocated. The only exception to this is if there's an |
|
e8b0b0392037
7046182: G1: remove unnecessary iterations over the collection set
tonyp
parents:
3774
diff
changeset
|
3548 // evacuation failure and instead of freeing the region we leave |
|
e8b0b0392037
7046182: G1: remove unnecessary iterations over the collection set
tonyp
parents:
3774
diff
changeset
|
3549 // it in the heap. In that case, we reset these fields during |
|
e8b0b0392037
7046182: G1: remove unnecessary iterations over the collection set
tonyp
parents:
3774
diff
changeset
|
3550 // evacuation failure handling. |
|
e8b0b0392037
7046182: G1: remove unnecessary iterations over the collection set
tonyp
parents:
3774
diff
changeset
|
3551 guarantee(hr->rem_set()->verify_ready_for_par_iteration(), "verification"); |
|
e8b0b0392037
7046182: G1: remove unnecessary iterations over the collection set
tonyp
parents:
3774
diff
changeset
|
3552 |
|
e8b0b0392037
7046182: G1: remove unnecessary iterations over the collection set
tonyp
parents:
3774
diff
changeset
|
3553 // Here's a good place to add any other checks we'd like to |
|
e8b0b0392037
7046182: G1: remove unnecessary iterations over the collection set
tonyp
parents:
3774
diff
changeset
|
3554 // perform on CSet regions. |
|
1261
0414c1049f15
6923991: G1: improve scalability of RSet scanning
iveresov
parents:
1245
diff
changeset
|
3555 return false; |
|
0414c1049f15
6923991: G1: improve scalability of RSet scanning
iveresov
parents:
1245
diff
changeset
|
3556 } |
|
0414c1049f15
6923991: G1: improve scalability of RSet scanning
iveresov
parents:
1245
diff
changeset
|
3557 }; |
|
3777
e8b0b0392037
7046182: G1: remove unnecessary iterations over the collection set
tonyp
parents:
3774
diff
changeset
|
3558 #endif // ASSERT |
|
1261
0414c1049f15
6923991: G1: improve scalability of RSet scanning
iveresov
parents:
1245
diff
changeset
|
3559 |
| 1709 | 3560 #if TASKQUEUE_STATS |
| 3561 void G1CollectedHeap::print_taskqueue_stats_hdr(outputStream* const st) { | |
| 3562 st->print_raw_cr("GC Task Stats"); | |
| 3563 st->print_raw("thr "); TaskQueueStats::print_header(1, st); st->cr(); | |
| 3564 st->print_raw("--- "); TaskQueueStats::print_header(2, st); st->cr(); | |
| 3565 } | |
| 3566 | |
| 3567 void G1CollectedHeap::print_taskqueue_stats(outputStream* const st) const { | |
| 3568 print_taskqueue_stats_hdr(st); | |
| 3569 | |
| 3570 TaskQueueStats totals; | |
|
1755
8e5955ddf8e4
6978300: G1: debug builds crash if ParallelGCThreads==0
jcoomes
parents:
1719
diff
changeset
|
3571 const int n = workers() != NULL ? workers()->total_workers() : 1; |
| 1709 | 3572 for (int i = 0; i < n; ++i) { |
| 3573 st->print("%3d ", i); task_queue(i)->stats.print(st); st->cr(); | |
| 3574 totals += task_queue(i)->stats; | |
| 3575 } | |
| 3576 st->print_raw("tot "); totals.print(st); st->cr(); | |
| 3577 | |
| 3578 DEBUG_ONLY(totals.verify()); | |
| 3579 } | |
| 3580 | |
| 3581 void G1CollectedHeap::reset_taskqueue_stats() { | |
|
1755
8e5955ddf8e4
6978300: G1: debug builds crash if ParallelGCThreads==0
jcoomes
parents:
1719
diff
changeset
|
3582 const int n = workers() != NULL ? workers()->total_workers() : 1; |
| 1709 | 3583 for (int i = 0; i < n; ++i) { |
| 3584 task_queue(i)->stats.reset(); | |
| 3585 } | |
| 3586 } | |
| 3587 #endif // TASKQUEUE_STATS | |
| 3588 | |
| 1973 | 3589 bool |
|
1656
4e5661ba9d98
6944166: G1: explicit GCs are not always handled correctly
tonyp
parents:
1611
diff
changeset
|
3590 G1CollectedHeap::do_collection_pause_at_safepoint(double target_pause_time_ms) { |
| 2152 | 3591 assert_at_safepoint(true /* should_be_vm_thread */); |
| 3592 guarantee(!is_gc_active(), "collection is not reentrant"); | |
| 3593 | |
|
1359
23b1b27ac76c
6909756: G1: guarantee(G1CollectedHeap::heap()->mark_in_progress(),"Precondition.")
tonyp
parents:
1313
diff
changeset
|
3594 if (GC_locker::check_active_before_gc()) { |
| 1973 | 3595 return false; |
|
1359
23b1b27ac76c
6909756: G1: guarantee(G1CollectedHeap::heap()->mark_in_progress(),"Precondition.")
tonyp
parents:
1313
diff
changeset
|
3596 } |
|
23b1b27ac76c
6909756: G1: guarantee(G1CollectedHeap::heap()->mark_in_progress(),"Precondition.")
tonyp
parents:
1313
diff
changeset
|
3597 |
|
2125
7246a374a9f2
6458402: 3 jvmti tests fail with CMS and +ExplicitGCInvokesConcurrent
kamg
parents:
2039
diff
changeset
|
3598 SvcGCMarker sgcm(SvcGCMarker::MINOR); |
|
2039
7c5250dbd584
6896624: G1: hotspot:::gc and hotspot:::mem-pool-gc probes are not fired
tonyp
parents:
2038
diff
changeset
|
3599 ResourceMark rm; |
|
7c5250dbd584
6896624: G1: hotspot:::gc and hotspot:::mem-pool-gc probes are not fired
tonyp
parents:
2038
diff
changeset
|
3600 |
|
4872
aa3d708d67c4
7141200: log some interesting information in ring buffers for crashes
never
parents:
4787
diff
changeset
|
3601 print_heap_before_gc(); |
|
838
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
parents:
811
diff
changeset
|
3602 |
| 4072 | 3603 HRSPhaseSetter x(HRSPhaseEvacuation); |
| 2152 | 3604 verify_region_sets_optional(); |
|
2433
abdfc822206f
7023069: G1: Introduce symmetric locking in the slow allocation path
tonyp
parents:
2432
diff
changeset
|
3605 verify_dirty_young_regions(); |
| 2152 | 3606 |
|
4831
7ca7be5a6a0b
7129271: G1: Interference from multiple threads in PrintGC/PrintGCDetails output
johnc
parents:
4829
diff
changeset
|
3607 // 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
|
3608 // 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
|
3609 // for the duration of this pause. |
|
7ca7be5a6a0b
7129271: G1: Interference from multiple threads in PrintGC/PrintGCDetails output
johnc
parents:
4829
diff
changeset
|
3610 g1_policy()->decide_on_conc_mark_initiation(); |
|
7ca7be5a6a0b
7129271: G1: Interference from multiple threads in PrintGC/PrintGCDetails output
johnc
parents:
4829
diff
changeset
|
3611 |
|
7ca7be5a6a0b
7129271: G1: Interference from multiple threads in PrintGC/PrintGCDetails output
johnc
parents:
4829
diff
changeset
|
3612 // 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
|
3613 assert(!g1_policy()->during_initial_mark_pause() || |
|
7ca7be5a6a0b
7129271: G1: Interference from multiple threads in PrintGC/PrintGCDetails output
johnc
parents:
4829
diff
changeset
|
3614 g1_policy()->gcs_are_young(), "sanity"); |
|
7ca7be5a6a0b
7129271: G1: Interference from multiple threads in PrintGC/PrintGCDetails output
johnc
parents:
4829
diff
changeset
|
3615 |
|
7ca7be5a6a0b
7129271: G1: Interference from multiple threads in PrintGC/PrintGCDetails output
johnc
parents:
4829
diff
changeset
|
3616 // 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
|
3617 assert(!mark_in_progress() || g1_policy()->gcs_are_young(), "sanity"); |
|
7ca7be5a6a0b
7129271: G1: Interference from multiple threads in PrintGC/PrintGCDetails output
johnc
parents:
4829
diff
changeset
|
3618 |
|
7ca7be5a6a0b
7129271: G1: Interference from multiple threads in PrintGC/PrintGCDetails output
johnc
parents:
4829
diff
changeset
|
3619 // 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
|
3620 // 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
|
3621 // 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
|
3622 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
|
3623 |
|
7ca7be5a6a0b
7129271: G1: Interference from multiple threads in PrintGC/PrintGCDetails output
johnc
parents:
4829
diff
changeset
|
3624 // 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
|
3625 { |
|
1656
4e5661ba9d98
6944166: G1: explicit GCs are not always handled correctly
tonyp
parents:
1611
diff
changeset
|
3626 if (g1_policy()->during_initial_mark_pause()) { |
|
4e5661ba9d98
6944166: G1: explicit GCs are not always handled correctly
tonyp
parents:
1611
diff
changeset
|
3627 // 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
|
3628 // full collection counter. |
|
6120
37552638d24a
7172388: G1: _total_full_collections should not be incremented for concurrent cycles
brutisso
parents:
6109
diff
changeset
|
3629 increment_old_marking_cycles_started(); |
|
1656
4e5661ba9d98
6944166: G1: explicit GCs are not always handled correctly
tonyp
parents:
1611
diff
changeset
|
3630 } |
|
6007
5c86f8211d1e
7160728: Introduce an extra logging level for G1 logging
brutisso
parents:
5987
diff
changeset
|
3631 // 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
|
3632 // 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
|
3633 // is messy if we do. |
|
6007
5c86f8211d1e
7160728: Introduce an extra logging level for G1 logging
brutisso
parents:
5987
diff
changeset
|
3634 gclog_or_tty->date_stamp(G1Log::fine() && PrintGCDateStamps); |
|
5c86f8211d1e
7160728: Introduce an extra logging level for G1 logging
brutisso
parents:
5987
diff
changeset
|
3635 TraceCPUTime tcpu(G1Log::finer(), true, gclog_or_tty); |
| 6030 | 3636 |
|
6219
922993931b3d
7178361: G1: Make sure that PrintGC and PrintGCDetails use the same timing for the GC pause
brutisso
parents:
6188
diff
changeset
|
3637 int active_workers = (G1CollectedHeap::use_parallel_gc_threads() ? |
|
922993931b3d
7178361: G1: Make sure that PrintGC and PrintGCDetails use the same timing for the GC pause
brutisso
parents:
6188
diff
changeset
|
3638 workers()->active_workers() : 1); |
|
922993931b3d
7178361: G1: Make sure that PrintGC and PrintGCDetails use the same timing for the GC pause
brutisso
parents:
6188
diff
changeset
|
3639 g1_policy()->phase_times()->note_gc_start(os::elapsedTime(), active_workers, |
|
922993931b3d
7178361: G1: Make sure that PrintGC and PrintGCDetails use the same timing for the GC pause
brutisso
parents:
6188
diff
changeset
|
3640 g1_policy()->gcs_are_young(), g1_policy()->during_initial_mark_pause(), gc_cause()); |
|
838
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
parents:
811
diff
changeset
|
3641 |
|
3289
b52782ae3880
6946417: G1: Java VisualVM does not support G1 properly.
jmasa
parents:
3285
diff
changeset
|
3642 TraceCollectorStats tcs(g1mm()->incremental_collection_counters()); |
|
3356
78542e2b5e35
7036199: Adding a notification to the implementation of GarbageCollectorMXBeans
fparain
parents:
3323
diff
changeset
|
3643 TraceMemoryManagerStats tms(false /* fullGC */, gc_cause()); |
|
1089
db0d5eba9d20
6815790: G1: Missing MemoryPoolMXBeans with -XX:+UseG1GC
tonyp
parents:
1088
diff
changeset
|
3644 |
| 2361 | 3645 // If the secondary_free_list is not empty, append it to the |
| 3646 // free_list. No need to wait for the cleanup operation to finish; | |
| 3647 // the region allocation code will check the secondary_free_list | |
| 3648 // and wait if necessary. If the G1StressConcRegionFreeing flag is | |
| 3649 // set, skip this step so that the region allocation code has to | |
| 3650 // get entries from the secondary_free_list. | |
| 2152 | 3651 if (!G1StressConcRegionFreeing) { |
| 2361 | 3652 append_secondary_free_list_if_not_empty_with_lock(); |
| 2152 | 3653 } |
|
838
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
parents:
811
diff
changeset
|
3654 |
|
3867
ff53346271fe
6814390: G1: remove the concept of non-generational G1
brutisso
parents:
3830
diff
changeset
|
3655 assert(check_young_list_well_formed(), |
|
ff53346271fe
6814390: G1: remove the concept of non-generational G1
brutisso
parents:
3830
diff
changeset
|
3656 "young list should be well formed"); |
|
838
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
parents:
811
diff
changeset
|
3657 |
|
4095
bca17e38de00
6593758: RFE: Enhance GC ergonomics to dynamically choose ParallelGCThreads
jmasa
parents:
4090
diff
changeset
|
3658 // 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
|
3659 // 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
|
3660 // it will be set. |
|
bca17e38de00
6593758: RFE: Enhance GC ergonomics to dynamically choose ParallelGCThreads
jmasa
parents:
4090
diff
changeset
|
3661 |
|
838
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
parents:
811
diff
changeset
|
3662 { // 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
|
3663 IsGCActiveMark x; |
|
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
parents:
811
diff
changeset
|
3664 |
|
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
parents:
811
diff
changeset
|
3665 gc_prologue(false); |
|
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
parents:
811
diff
changeset
|
3666 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
|
3667 increment_gc_time_stamp(); |
| 342 | 3668 |
|
838
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
parents:
811
diff
changeset
|
3669 if (VerifyBeforeGC && total_collections() >= VerifyGCStartAt) { |
|
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
parents:
811
diff
changeset
|
3670 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
|
3671 gclog_or_tty->print(" VerifyBeforeGC:"); |
|
838
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
parents:
811
diff
changeset
|
3672 prepare_for_verify(); |
| 6008 | 3673 Universe::verify(/* silent */ false, |
|
3772
6747fd0512e0
7004681: G1: Extend marking verification to Full GCs
johnc
parents:
3766
diff
changeset
|
3674 /* option */ VerifyOption_G1UsePrevMarking); |
|
838
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 |
|
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
parents:
811
diff
changeset
|
3677 COMPILER2_PRESENT(DerivedPointerTable::clear()); |
|
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
parents:
811
diff
changeset
|
3678 |
|
3979
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3679 // Please see comment in g1CollectedHeap.hpp and |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3680 // G1CollectedHeap::ref_processing_init() to see how |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3681 // reference processing currently works in G1. |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3682 |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3683 // Enable discovery in the STW reference processor |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3684 ref_processor_stw()->enable_discovery(true /*verify_disabled*/, |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3685 true /*verify_no_refs*/); |
|
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 { |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3688 // We want to temporarily turn off discovery by the |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3689 // CM ref processor, if necessary, and turn it back on |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3690 // on again later if we do. Using a scoped |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3691 // NoRefDiscovery object will do this. |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3692 NoRefDiscovery no_cm_discovery(ref_processor_cm()); |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3693 |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3694 // 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
|
3695 // of the collection set!). |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3696 release_mutator_alloc_region(); |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3697 |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3698 // We should call this after we retire the mutator alloc |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3699 // region(s) so that all the ALLOC / RETIRE events are generated |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3700 // before the start GC event. |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3701 _hr_printer.start_gc(false /* full */, (size_t) total_collections()); |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3702 |
|
6219
922993931b3d
7178361: G1: Make sure that PrintGC and PrintGCDetails use the same timing for the GC pause
brutisso
parents:
6188
diff
changeset
|
3703 // This timing is only used by the ergonomics to handle our pause target. |
|
922993931b3d
7178361: G1: Make sure that PrintGC and PrintGCDetails use the same timing for the GC pause
brutisso
parents:
6188
diff
changeset
|
3704 // It is unclear why this should not include the full pause. We will |
|
922993931b3d
7178361: G1: Make sure that PrintGC and PrintGCDetails use the same timing for the GC pause
brutisso
parents:
6188
diff
changeset
|
3705 // investigate this in CR 7178365. |
|
922993931b3d
7178361: G1: Make sure that PrintGC and PrintGCDetails use the same timing for the GC pause
brutisso
parents:
6188
diff
changeset
|
3706 // |
|
922993931b3d
7178361: G1: Make sure that PrintGC and PrintGCDetails use the same timing for the GC pause
brutisso
parents:
6188
diff
changeset
|
3707 // Preserving the old comment here if that helps the investigation: |
|
922993931b3d
7178361: G1: Make sure that PrintGC and PrintGCDetails use the same timing for the GC pause
brutisso
parents:
6188
diff
changeset
|
3708 // |
|
3979
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3709 // The elapsed time induced by the start time below deliberately elides |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3710 // the possible verification above. |
|
6219
922993931b3d
7178361: G1: Make sure that PrintGC and PrintGCDetails use the same timing for the GC pause
brutisso
parents:
6188
diff
changeset
|
3711 double sample_start_time_sec = os::elapsedTime(); |
|
3979
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3712 size_t start_used_bytes = used(); |
|
838
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
parents:
811
diff
changeset
|
3713 |
|
1394
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
3714 #if YOUNG_LIST_VERBOSE |
|
3979
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3715 gclog_or_tty->print_cr("\nBefore recording pause start.\nYoung_list:"); |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3716 _young_list->print(); |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3717 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
|
3718 #endif // YOUNG_LIST_VERBOSE |
|
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
3719 |
|
6219
922993931b3d
7178361: G1: Make sure that PrintGC and PrintGCDetails use the same timing for the GC pause
brutisso
parents:
6188
diff
changeset
|
3720 g1_policy()->record_collection_pause_start(sample_start_time_sec, |
|
3979
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3721 start_used_bytes); |
|
838
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
parents:
811
diff
changeset
|
3722 |
|
4837
eff609af17d7
7127706: G1: re-enable survivors during the initial-mark pause
tonyp
parents:
4836
diff
changeset
|
3723 double scan_wait_start = os::elapsedTime(); |
|
eff609af17d7
7127706: G1: re-enable survivors during the initial-mark pause
tonyp
parents:
4836
diff
changeset
|
3724 // 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
|
3725 // 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
|
3726 // 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
|
3727 // moving them during the GC. |
|
eff609af17d7
7127706: G1: re-enable survivors during the initial-mark pause
tonyp
parents:
4836
diff
changeset
|
3728 bool waited = _cm->root_regions()->wait_until_scan_finished(); |
|
6219
922993931b3d
7178361: G1: Make sure that PrintGC and PrintGCDetails use the same timing for the GC pause
brutisso
parents:
6188
diff
changeset
|
3729 double wait_time_ms = 0.0; |
|
4837
eff609af17d7
7127706: G1: re-enable survivors during the initial-mark pause
tonyp
parents:
4836
diff
changeset
|
3730 if (waited) { |
|
eff609af17d7
7127706: G1: re-enable survivors during the initial-mark pause
tonyp
parents:
4836
diff
changeset
|
3731 double scan_wait_end = os::elapsedTime(); |
|
6219
922993931b3d
7178361: G1: Make sure that PrintGC and PrintGCDetails use the same timing for the GC pause
brutisso
parents:
6188
diff
changeset
|
3732 wait_time_ms = (scan_wait_end - scan_wait_start) * 1000.0; |
|
4837
eff609af17d7
7127706: G1: re-enable survivors during the initial-mark pause
tonyp
parents:
4836
diff
changeset
|
3733 } |
|
6219
922993931b3d
7178361: G1: Make sure that PrintGC and PrintGCDetails use the same timing for the GC pause
brutisso
parents:
6188
diff
changeset
|
3734 g1_policy()->phase_times()->record_root_region_scan_wait_time(wait_time_ms); |
|
4837
eff609af17d7
7127706: G1: re-enable survivors during the initial-mark pause
tonyp
parents:
4836
diff
changeset
|
3735 |
|
1394
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
3736 #if YOUNG_LIST_VERBOSE |
|
3979
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3737 gclog_or_tty->print_cr("\nAfter recording pause start.\nYoung_list:"); |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3738 _young_list->print(); |
|
1394
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
3739 #endif // YOUNG_LIST_VERBOSE |
| 342 | 3740 |
|
3979
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3741 if (g1_policy()->during_initial_mark_pause()) { |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3742 concurrent_mark()->checkpointRootsInitialPre(); |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3743 } |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3744 perm_gen()->save_marks(); |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3745 |
|
1394
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
3746 #if YOUNG_LIST_VERBOSE |
|
3979
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3747 gclog_or_tty->print_cr("\nBefore choosing collection set.\nYoung_list:"); |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3748 _young_list->print(); |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3749 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
|
3750 #endif // YOUNG_LIST_VERBOSE |
|
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
3751 |
|
4912
a9647476d1a4
7132029: G1: mixed GC phase lasts for longer than it should
tonyp
parents:
4910
diff
changeset
|
3752 g1_policy()->finalize_cset(target_pause_time_ms); |
|
3979
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3753 |
|
4787
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
4785
diff
changeset
|
3754 _cm->note_start_of_gc(); |
|
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
4785
diff
changeset
|
3755 // 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
|
3756 // 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
|
3757 // 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
|
3758 // ensure that the CSet has been finalized. |
|
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
4785
diff
changeset
|
3759 _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
|
3760 true /* verify_enqueued_buffers */, |
|
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
4785
diff
changeset
|
3761 false /* verify_thread_buffers */, |
|
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
4785
diff
changeset
|
3762 true /* verify_fingers */); |
|
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
4785
diff
changeset
|
3763 |
|
3979
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3764 if (_hr_printer.is_active()) { |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3765 HeapRegion* hr = g1_policy()->collection_set(); |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3766 while (hr != NULL) { |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3767 G1HRPrinter::RegionType type; |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3768 if (!hr->is_young()) { |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3769 type = G1HRPrinter::Old; |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3770 } else if (hr->is_survivor()) { |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3771 type = G1HRPrinter::Survivor; |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3772 } else { |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3773 type = G1HRPrinter::Eden; |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3774 } |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3775 _hr_printer.cset(hr); |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3776 hr = hr->next_in_collection_set(); |
|
3778
5f6f2615433a
7049999: G1: Make the G1PrintHeapRegions output consistent and complete
tonyp
parents:
3777
diff
changeset
|
3777 } |
|
5f6f2615433a
7049999: G1: Make the G1PrintHeapRegions output consistent and complete
tonyp
parents:
3777
diff
changeset
|
3778 } |
|
3979
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3779 |
|
3777
e8b0b0392037
7046182: G1: remove unnecessary iterations over the collection set
tonyp
parents:
3774
diff
changeset
|
3780 #ifdef ASSERT |
|
3979
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3781 VerifyCSetClosure cl; |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3782 collection_set_iterate(&cl); |
|
3777
e8b0b0392037
7046182: G1: remove unnecessary iterations over the collection set
tonyp
parents:
3774
diff
changeset
|
3783 #endif // ASSERT |
| 1707 | 3784 |
|
3979
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3785 setup_surviving_young_words(); |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3786 |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3787 // Initialize the GC alloc regions. |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3788 init_gc_alloc_regions(); |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3789 |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3790 // Actually do the work... |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3791 evacuate_collection_set(); |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3792 |
|
4787
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
4785
diff
changeset
|
3793 // 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
|
3794 // (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
|
3795 // 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
|
3796 // 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
|
3797 // we checked. |
|
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
4785
diff
changeset
|
3798 _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
|
3799 false /* verify_enqueued_buffers */, |
|
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
4785
diff
changeset
|
3800 true /* verify_thread_buffers */, |
|
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
4785
diff
changeset
|
3801 true /* verify_fingers */); |
|
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
4785
diff
changeset
|
3802 |
|
3979
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3803 free_collection_set(g1_policy()->collection_set()); |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3804 g1_policy()->clear_collection_set(); |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3805 |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3806 cleanup_surviving_young_words(); |
|
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 // Start a new incremental collection set for the next pause. |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3809 g1_policy()->start_incremental_cset_building(); |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3810 |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3811 // Clear the _cset_fast_test bitmap in anticipation of adding |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3812 // regions to the incremental collection set for the next |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3813 // evacuation pause. |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3814 clear_cset_fast_test(); |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3815 |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3816 _young_list->reset_sampled_info(); |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3817 |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3818 // Don't check the whole heap at this point as the |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3819 // GC alloc regions from this pause have been tagged |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3820 // as survivors and moved on to the survivor list. |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3821 // Survivor regions will fail the !is_young() check. |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3822 assert(check_young_list_empty(false /* check_heap */), |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3823 "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
|
3824 |
|
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
3825 #if YOUNG_LIST_VERBOSE |
|
3979
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3826 gclog_or_tty->print_cr("Before recording survivors.\nYoung List:"); |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3827 _young_list->print(); |
|
1394
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
3828 #endif // YOUNG_LIST_VERBOSE |
| 342 | 3829 |
|
3979
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3830 g1_policy()->record_survivor_regions(_young_list->survivor_length(), |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3831 _young_list->first_survivor_region(), |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3832 _young_list->last_survivor_region()); |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3833 |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3834 _young_list->reset_auxilary_lists(); |
|
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 (evacuation_failed()) { |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3837 _summary_bytes_used = recalculate_used(); |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3838 } else { |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3839 // The "used" of the the collection set have already been subtracted |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3840 // when they were freed. Add in the bytes evacuated. |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3841 _summary_bytes_used += g1_policy()->bytes_copied_during_gc(); |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3842 } |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3843 |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3844 if (g1_policy()->during_initial_mark_pause()) { |
|
4837
eff609af17d7
7127706: G1: re-enable survivors during the initial-mark pause
tonyp
parents:
4836
diff
changeset
|
3845 // 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
|
3846 // 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
|
3847 // appropriate initialization is done on the CM object. |
|
3979
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3848 concurrent_mark()->checkpointRootsInitialPost(); |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3849 set_marking_started(); |
|
4831
7ca7be5a6a0b
7129271: G1: Interference from multiple threads in PrintGC/PrintGCDetails output
johnc
parents:
4829
diff
changeset
|
3850 // 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
|
3851 // 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
|
3852 // the current thread has completed its logging output. |
|
3979
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3853 } |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3854 |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3855 allocate_dummy_regions(); |
|
3285
49a67202bc67
7011855: G1: non-product flag to artificially grow the heap
tonyp
parents:
2433
diff
changeset
|
3856 |
|
1394
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
3857 #if YOUNG_LIST_VERBOSE |
|
3979
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3858 gclog_or_tty->print_cr("\nEnd of the pause.\nYoung_list:"); |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3859 _young_list->print(); |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3860 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
|
3861 #endif // YOUNG_LIST_VERBOSE |
| 342 | 3862 |
|
3979
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3863 init_mutator_alloc_region(); |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3864 |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3865 { |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3866 size_t expand_bytes = g1_policy()->expansion_amount(); |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3867 if (expand_bytes > 0) { |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3868 size_t bytes_before = capacity(); |
| 4785 | 3869 // No need for an ergo verbose message here, |
| 3870 // expansion_amount() does this when it returns a value > 0. | |
|
3979
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3871 if (!expand(expand_bytes)) { |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3872 // We failed to expand the heap so let's verify that |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3873 // committed/uncommitted amount match the backing store |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3874 assert(capacity() == _g1_storage.committed_size(), "committed size mismatch"); |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3875 assert(max_capacity() == _g1_storage.reserved_size(), "reserved size mismatch"); |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3876 } |
|
3920
af2ab04e0038
6929868: G1: introduce min / max young gen size bounds
brutisso
parents:
3919
diff
changeset
|
3877 } |
|
af2ab04e0038
6929868: G1: introduce min / max young gen size bounds
brutisso
parents:
3919
diff
changeset
|
3878 } |
|
3979
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3879 |
|
4787
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
4785
diff
changeset
|
3880 // 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
|
3881 // 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
|
3882 _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
|
3883 true /* verify_enqueued_buffers */, |
|
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
4785
diff
changeset
|
3884 true /* verify_thread_buffers */, |
|
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
4785
diff
changeset
|
3885 true /* verify_fingers */); |
|
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
4785
diff
changeset
|
3886 _cm->note_end_of_gc(); |
|
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
4785
diff
changeset
|
3887 |
|
6219
922993931b3d
7178361: G1: Make sure that PrintGC and PrintGCDetails use the same timing for the GC pause
brutisso
parents:
6188
diff
changeset
|
3888 // Collect thread local data to allow the ergonomics to use |
|
922993931b3d
7178361: G1: Make sure that PrintGC and PrintGCDetails use the same timing for the GC pause
brutisso
parents:
6188
diff
changeset
|
3889 // the collected information |
|
922993931b3d
7178361: G1: Make sure that PrintGC and PrintGCDetails use the same timing for the GC pause
brutisso
parents:
6188
diff
changeset
|
3890 g1_policy()->phase_times()->collapse_par_times(); |
|
922993931b3d
7178361: G1: Make sure that PrintGC and PrintGCDetails use the same timing for the GC pause
brutisso
parents:
6188
diff
changeset
|
3891 |
|
922993931b3d
7178361: G1: Make sure that PrintGC and PrintGCDetails use the same timing for the GC pause
brutisso
parents:
6188
diff
changeset
|
3892 // This timing is only used by the ergonomics to handle our pause target. |
|
922993931b3d
7178361: G1: Make sure that PrintGC and PrintGCDetails use the same timing for the GC pause
brutisso
parents:
6188
diff
changeset
|
3893 // It is unclear why this should not include the full pause. We will |
|
922993931b3d
7178361: G1: Make sure that PrintGC and PrintGCDetails use the same timing for the GC pause
brutisso
parents:
6188
diff
changeset
|
3894 // investigate this in CR 7178365. |
|
922993931b3d
7178361: G1: Make sure that PrintGC and PrintGCDetails use the same timing for the GC pause
brutisso
parents:
6188
diff
changeset
|
3895 double sample_end_time_sec = os::elapsedTime(); |
|
922993931b3d
7178361: G1: Make sure that PrintGC and PrintGCDetails use the same timing for the GC pause
brutisso
parents:
6188
diff
changeset
|
3896 double pause_time_ms = (sample_end_time_sec - sample_start_time_sec) * MILLIUNITS; |
|
922993931b3d
7178361: G1: Make sure that PrintGC and PrintGCDetails use the same timing for the GC pause
brutisso
parents:
6188
diff
changeset
|
3897 g1_policy()->record_collection_pause_end(pause_time_ms); |
|
3979
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3898 |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3899 MemoryService::track_memory_usage(); |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3900 |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3901 // 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
|
3902 // update buffers to bring the RSets up-to-date if |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3903 // G1HRRSFlushLogBuffersOnVerify has been set. While scanning |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3904 // 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
|
3905 // regions we just allocated to (i.e., the GC alloc |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3906 // regions). However, during the last GC we called |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3907 // set_saved_mark() on all the GC alloc regions, so card |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3908 // scanning might skip the [saved_mark_word()...top()] area of |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3909 // those regions (i.e., the area we allocated objects into |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3910 // during the last GC). But it shouldn't. Given that |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3911 // saved_mark_word() is conditional on whether the GC time stamp |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3912 // 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
|
3913 // 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
|
3914 // regions and saved_mark_word() will simply return top() for |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3915 // 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
|
3916 // than iterating over the regions and fixing them. In fact, the |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3917 // GC time stamp increment here also ensures that |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3918 // saved_mark_word() will return top() between pauses, i.e., |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3919 // during concurrent refinement. So we don't need the |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3920 // is_gc_active() check to decided which top to use when |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3921 // scanning cards (see CR 7039627). |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3922 increment_gc_time_stamp(); |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3923 |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3924 if (VerifyAfterGC && total_collections() >= VerifyGCStartAt) { |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3925 HandleMark hm; // Discard invalid handles created during verification |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3926 gclog_or_tty->print(" VerifyAfterGC:"); |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3927 prepare_for_verify(); |
| 6008 | 3928 Universe::verify(/* silent */ false, |
|
3979
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3929 /* option */ VerifyOption_G1UsePrevMarking); |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3930 } |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3931 |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3932 assert(!ref_processor_stw()->discovery_enabled(), "Postcondition"); |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3933 ref_processor_stw()->verify_no_references_recorded(); |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3934 |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3935 // 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
|
3936 } |
|
af2ab04e0038
6929868: G1: introduce min / max young gen size bounds
brutisso
parents:
3919
diff
changeset
|
3937 |
|
3778
5f6f2615433a
7049999: G1: Make the G1PrintHeapRegions output consistent and complete
tonyp
parents:
3777
diff
changeset
|
3938 // 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
|
3939 // 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
|
3940 // 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
|
3941 // RETIRE events are generated before the end GC event. |
|
5f6f2615433a
7049999: G1: Make the G1PrintHeapRegions output consistent and complete
tonyp
parents:
3777
diff
changeset
|
3942 _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
|
3943 |
|
838
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
parents:
811
diff
changeset
|
3944 if (mark_in_progress()) { |
|
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
parents:
811
diff
changeset
|
3945 concurrent_mark()->update_g1_committed(); |
|
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
parents:
811
diff
changeset
|
3946 } |
|
546
05c6d52fa7a9
6690928: Use spinning in combination with yields for workstealing termination.
jmasa
parents:
545
diff
changeset
|
3947 |
|
05c6d52fa7a9
6690928: Use spinning in combination with yields for workstealing termination.
jmasa
parents:
545
diff
changeset
|
3948 #ifdef TRACESPINNING |
|
838
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
parents:
811
diff
changeset
|
3949 ParallelTaskTerminator::print_termination_counts(); |
|
546
05c6d52fa7a9
6690928: Use spinning in combination with yields for workstealing termination.
jmasa
parents:
545
diff
changeset
|
3950 #endif |
| 342 | 3951 |
|
838
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
parents:
811
diff
changeset
|
3952 gc_epilogue(false); |
|
6219
922993931b3d
7178361: G1: Make sure that PrintGC and PrintGCDetails use the same timing for the GC pause
brutisso
parents:
6188
diff
changeset
|
3953 |
|
922993931b3d
7178361: G1: Make sure that PrintGC and PrintGCDetails use the same timing for the GC pause
brutisso
parents:
6188
diff
changeset
|
3954 g1_policy()->phase_times()->note_gc_end(os::elapsedTime()); |
|
922993931b3d
7178361: G1: Make sure that PrintGC and PrintGCDetails use the same timing for the GC pause
brutisso
parents:
6188
diff
changeset
|
3955 |
|
922993931b3d
7178361: G1: Make sure that PrintGC and PrintGCDetails use the same timing for the GC pause
brutisso
parents:
6188
diff
changeset
|
3956 // We have to do this after we decide whether to expand the heap or not. |
|
922993931b3d
7178361: G1: Make sure that PrintGC and PrintGCDetails use the same timing for the GC pause
brutisso
parents:
6188
diff
changeset
|
3957 g1_policy()->print_heap_transition(); |
|
838
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
parents:
811
diff
changeset
|
3958 } |
|
6121
b9442ac22f59
7173460: G1: java/lang/management/MemoryMXBean/CollectionUsageThreshold.java failes with G1
brutisso
parents:
6120
diff
changeset
|
3959 |
|
6219
922993931b3d
7178361: G1: Make sure that PrintGC and PrintGCDetails use the same timing for the GC pause
brutisso
parents:
6188
diff
changeset
|
3960 // It is not yet to safe to tell the concurrent mark to |
|
6121
b9442ac22f59
7173460: G1: java/lang/management/MemoryMXBean/CollectionUsageThreshold.java failes with G1
brutisso
parents:
6120
diff
changeset
|
3961 // 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
|
3962 // 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
|
3963 // logging output either. |
|
b9442ac22f59
7173460: G1: java/lang/management/MemoryMXBean/CollectionUsageThreshold.java failes with G1
brutisso
parents:
6120
diff
changeset
|
3964 |
|
b9442ac22f59
7173460: G1: java/lang/management/MemoryMXBean/CollectionUsageThreshold.java failes with G1
brutisso
parents:
6120
diff
changeset
|
3965 _hrs.verify_optional(); |
|
b9442ac22f59
7173460: G1: java/lang/management/MemoryMXBean/CollectionUsageThreshold.java failes with G1
brutisso
parents:
6120
diff
changeset
|
3966 verify_region_sets_optional(); |
|
b9442ac22f59
7173460: G1: java/lang/management/MemoryMXBean/CollectionUsageThreshold.java failes with G1
brutisso
parents:
6120
diff
changeset
|
3967 |
|
b9442ac22f59
7173460: G1: java/lang/management/MemoryMXBean/CollectionUsageThreshold.java failes with G1
brutisso
parents:
6120
diff
changeset
|
3968 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
|
3969 TASKQUEUE_STATS_ONLY(reset_taskqueue_stats()); |
|
b9442ac22f59
7173460: G1: java/lang/management/MemoryMXBean/CollectionUsageThreshold.java failes with G1
brutisso
parents:
6120
diff
changeset
|
3970 |
|
b9442ac22f59
7173460: G1: java/lang/management/MemoryMXBean/CollectionUsageThreshold.java failes with G1
brutisso
parents:
6120
diff
changeset
|
3971 print_heap_after_gc(); |
|
b9442ac22f59
7173460: G1: java/lang/management/MemoryMXBean/CollectionUsageThreshold.java failes with G1
brutisso
parents:
6120
diff
changeset
|
3972 |
|
b9442ac22f59
7173460: G1: java/lang/management/MemoryMXBean/CollectionUsageThreshold.java failes with G1
brutisso
parents:
6120
diff
changeset
|
3973 // 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
|
3974 // 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
|
3975 // 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
|
3976 // before any GC notifications are raised. |
|
b9442ac22f59
7173460: G1: java/lang/management/MemoryMXBean/CollectionUsageThreshold.java failes with G1
brutisso
parents:
6120
diff
changeset
|
3977 g1mm()->update_sizes(); |
|
b9442ac22f59
7173460: G1: java/lang/management/MemoryMXBean/CollectionUsageThreshold.java failes with G1
brutisso
parents:
6120
diff
changeset
|
3978 } |
|
3289
b52782ae3880
6946417: G1: Java VisualVM does not support G1 properly.
jmasa
parents:
3285
diff
changeset
|
3979 |
|
884
83b687ce3090
6866591: G1: print update buffer processing stats more often
tonyp
parents:
883
diff
changeset
|
3980 if (G1SummarizeRSetStats && |
|
83b687ce3090
6866591: G1: print update buffer processing stats more often
tonyp
parents:
883
diff
changeset
|
3981 (G1SummarizeRSetStatsPeriod > 0) && |
|
83b687ce3090
6866591: G1: print update buffer processing stats more often
tonyp
parents:
883
diff
changeset
|
3982 (total_collections() % G1SummarizeRSetStatsPeriod == 0)) { |
|
83b687ce3090
6866591: G1: print update buffer processing stats more often
tonyp
parents:
883
diff
changeset
|
3983 g1_rem_set()->print_summary_info(); |
|
83b687ce3090
6866591: G1: print update buffer processing stats more often
tonyp
parents:
883
diff
changeset
|
3984 } |
| 1973 | 3985 |
|
4831
7ca7be5a6a0b
7129271: G1: Interference from multiple threads in PrintGC/PrintGCDetails output
johnc
parents:
4829
diff
changeset
|
3986 // 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
|
3987 // 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
|
3988 // that came from the pause. |
|
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 if (should_start_conc_mark) { |
|
7ca7be5a6a0b
7129271: G1: Interference from multiple threads in PrintGC/PrintGCDetails output
johnc
parents:
4829
diff
changeset
|
3991 // CAUTION: after the doConcurrentMark() call below, |
|
7ca7be5a6a0b
7129271: G1: Interference from multiple threads in PrintGC/PrintGCDetails output
johnc
parents:
4829
diff
changeset
|
3992 // the concurrent marking thread(s) could be running |
|
7ca7be5a6a0b
7129271: G1: Interference from multiple threads in PrintGC/PrintGCDetails output
johnc
parents:
4829
diff
changeset
|
3993 // concurrently with us. Make sure that anything after |
|
7ca7be5a6a0b
7129271: G1: Interference from multiple threads in PrintGC/PrintGCDetails output
johnc
parents:
4829
diff
changeset
|
3994 // 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
|
3995 // 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
|
3996 // 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
|
3997 // ConcurrentGCThread::safepoint_desynchronize(). |
|
7ca7be5a6a0b
7129271: G1: Interference from multiple threads in PrintGC/PrintGCDetails output
johnc
parents:
4829
diff
changeset
|
3998 doConcurrentMark(); |
|
7ca7be5a6a0b
7129271: G1: Interference from multiple threads in PrintGC/PrintGCDetails output
johnc
parents:
4829
diff
changeset
|
3999 } |
|
7ca7be5a6a0b
7129271: G1: Interference from multiple threads in PrintGC/PrintGCDetails output
johnc
parents:
4829
diff
changeset
|
4000 |
| 1973 | 4001 return true; |
| 342 | 4002 } |
| 4003 | |
|
1391
79e419e5ea3b
6942253: G1: replace G1ParallelGCAllocBufferSize with YoungPLABSize and OldPLABSize
apetrusenko
parents:
1390
diff
changeset
|
4004 size_t G1CollectedHeap::desired_plab_sz(GCAllocPurpose purpose) |
|
79e419e5ea3b
6942253: G1: replace G1ParallelGCAllocBufferSize with YoungPLABSize and OldPLABSize
apetrusenko
parents:
1390
diff
changeset
|
4005 { |
|
79e419e5ea3b
6942253: G1: replace G1ParallelGCAllocBufferSize with YoungPLABSize and OldPLABSize
apetrusenko
parents:
1390
diff
changeset
|
4006 size_t gclab_word_size; |
|
79e419e5ea3b
6942253: G1: replace G1ParallelGCAllocBufferSize with YoungPLABSize and OldPLABSize
apetrusenko
parents:
1390
diff
changeset
|
4007 switch (purpose) { |
|
79e419e5ea3b
6942253: G1: replace G1ParallelGCAllocBufferSize with YoungPLABSize and OldPLABSize
apetrusenko
parents:
1390
diff
changeset
|
4008 case GCAllocForSurvived: |
|
79e419e5ea3b
6942253: G1: replace G1ParallelGCAllocBufferSize with YoungPLABSize and OldPLABSize
apetrusenko
parents:
1390
diff
changeset
|
4009 gclab_word_size = YoungPLABSize; |
|
79e419e5ea3b
6942253: G1: replace G1ParallelGCAllocBufferSize with YoungPLABSize and OldPLABSize
apetrusenko
parents:
1390
diff
changeset
|
4010 break; |
|
79e419e5ea3b
6942253: G1: replace G1ParallelGCAllocBufferSize with YoungPLABSize and OldPLABSize
apetrusenko
parents:
1390
diff
changeset
|
4011 case GCAllocForTenured: |
|
79e419e5ea3b
6942253: G1: replace G1ParallelGCAllocBufferSize with YoungPLABSize and OldPLABSize
apetrusenko
parents:
1390
diff
changeset
|
4012 gclab_word_size = OldPLABSize; |
|
79e419e5ea3b
6942253: G1: replace G1ParallelGCAllocBufferSize with YoungPLABSize and OldPLABSize
apetrusenko
parents:
1390
diff
changeset
|
4013 break; |
|
79e419e5ea3b
6942253: G1: replace G1ParallelGCAllocBufferSize with YoungPLABSize and OldPLABSize
apetrusenko
parents:
1390
diff
changeset
|
4014 default: |
|
79e419e5ea3b
6942253: G1: replace G1ParallelGCAllocBufferSize with YoungPLABSize and OldPLABSize
apetrusenko
parents:
1390
diff
changeset
|
4015 assert(false, "unknown GCAllocPurpose"); |
|
79e419e5ea3b
6942253: G1: replace G1ParallelGCAllocBufferSize with YoungPLABSize and OldPLABSize
apetrusenko
parents:
1390
diff
changeset
|
4016 gclab_word_size = OldPLABSize; |
|
79e419e5ea3b
6942253: G1: replace G1ParallelGCAllocBufferSize with YoungPLABSize and OldPLABSize
apetrusenko
parents:
1390
diff
changeset
|
4017 break; |
|
79e419e5ea3b
6942253: G1: replace G1ParallelGCAllocBufferSize with YoungPLABSize and OldPLABSize
apetrusenko
parents:
1390
diff
changeset
|
4018 } |
|
79e419e5ea3b
6942253: G1: replace G1ParallelGCAllocBufferSize with YoungPLABSize and OldPLABSize
apetrusenko
parents:
1390
diff
changeset
|
4019 return gclab_word_size; |
|
79e419e5ea3b
6942253: G1: replace G1ParallelGCAllocBufferSize with YoungPLABSize and OldPLABSize
apetrusenko
parents:
1390
diff
changeset
|
4020 } |
|
79e419e5ea3b
6942253: G1: replace G1ParallelGCAllocBufferSize with YoungPLABSize and OldPLABSize
apetrusenko
parents:
1390
diff
changeset
|
4021 |
|
2433
abdfc822206f
7023069: G1: Introduce symmetric locking in the slow allocation path
tonyp
parents:
2432
diff
changeset
|
4022 void G1CollectedHeap::init_mutator_alloc_region() { |
|
abdfc822206f
7023069: G1: Introduce symmetric locking in the slow allocation path
tonyp
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changeset
|
4023 assert(_mutator_alloc_region.get() == NULL, "pre-condition"); |
|
abdfc822206f
7023069: G1: Introduce symmetric locking in the slow allocation path
tonyp
parents:
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changeset
|
4024 _mutator_alloc_region.init(); |
|
abdfc822206f
7023069: G1: Introduce symmetric locking in the slow allocation path
tonyp
parents:
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changeset
|
4025 } |
|
abdfc822206f
7023069: G1: Introduce symmetric locking in the slow allocation path
tonyp
parents:
2432
diff
changeset
|
4026 |
|
abdfc822206f
7023069: G1: Introduce symmetric locking in the slow allocation path
tonyp
parents:
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diff
changeset
|
4027 void G1CollectedHeap::release_mutator_alloc_region() { |
|
abdfc822206f
7023069: G1: Introduce symmetric locking in the slow allocation path
tonyp
parents:
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changeset
|
4028 _mutator_alloc_region.release(); |
|
abdfc822206f
7023069: G1: Introduce symmetric locking in the slow allocation path
tonyp
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diff
changeset
|
4029 assert(_mutator_alloc_region.get() == NULL, "post-condition"); |
|
abdfc822206f
7023069: G1: Introduce symmetric locking in the slow allocation path
tonyp
parents:
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changeset
|
4030 } |
|
1391
79e419e5ea3b
6942253: G1: replace G1ParallelGCAllocBufferSize with YoungPLABSize and OldPLABSize
apetrusenko
parents:
1390
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changeset
|
4031 |
|
3830
f44782f04dd4
7039627: G1: avoid BOT updates for survivor allocations and dirty survivor regions incrementally
tonyp
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|
4032 void G1CollectedHeap::init_gc_alloc_regions() { |
|
f44782f04dd4
7039627: G1: avoid BOT updates for survivor allocations and dirty survivor regions incrementally
tonyp
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changeset
|
4033 assert_at_safepoint(true /* should_be_vm_thread */); |
|
f44782f04dd4
7039627: G1: avoid BOT updates for survivor allocations and dirty survivor regions incrementally
tonyp
parents:
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changeset
|
4034 |
|
f44782f04dd4
7039627: G1: avoid BOT updates for survivor allocations and dirty survivor regions incrementally
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changeset
|
4035 _survivor_gc_alloc_region.init(); |
|
f44782f04dd4
7039627: G1: avoid BOT updates for survivor allocations and dirty survivor regions incrementally
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changeset
|
4036 _old_gc_alloc_region.init(); |
|
f44782f04dd4
7039627: G1: avoid BOT updates for survivor allocations and dirty survivor regions incrementally
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changeset
|
4037 HeapRegion* retained_region = _retained_old_gc_alloc_region; |
|
f44782f04dd4
7039627: G1: avoid BOT updates for survivor allocations and dirty survivor regions incrementally
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parents:
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changeset
|
4038 _retained_old_gc_alloc_region = NULL; |
|
f44782f04dd4
7039627: G1: avoid BOT updates for survivor allocations and dirty survivor regions incrementally
tonyp
parents:
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diff
changeset
|
4039 |
|
f44782f04dd4
7039627: G1: avoid BOT updates for survivor allocations and dirty survivor regions incrementally
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parents:
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changeset
|
4040 // We will discard the current GC alloc region if: |
|
f44782f04dd4
7039627: G1: avoid BOT updates for survivor allocations and dirty survivor regions incrementally
tonyp
parents:
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diff
changeset
|
4041 // a) it's in the collection set (it can happen!), |
|
f44782f04dd4
7039627: G1: avoid BOT updates for survivor allocations and dirty survivor regions incrementally
tonyp
parents:
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diff
changeset
|
4042 // b) it's already full (no point in using it), |
|
f44782f04dd4
7039627: G1: avoid BOT updates for survivor allocations and dirty survivor regions incrementally
tonyp
parents:
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diff
changeset
|
4043 // c) it's empty (this means that it was emptied during |
|
f44782f04dd4
7039627: G1: avoid BOT updates for survivor allocations and dirty survivor regions incrementally
tonyp
parents:
3824
diff
changeset
|
4044 // a cleanup and it should be on the free list now), or |
|
f44782f04dd4
7039627: G1: avoid BOT updates for survivor allocations and dirty survivor regions incrementally
tonyp
parents:
3824
diff
changeset
|
4045 // d) it's humongous (this means that it was emptied |
|
f44782f04dd4
7039627: G1: avoid BOT updates for survivor allocations and dirty survivor regions incrementally
tonyp
parents:
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diff
changeset
|
4046 // during a cleanup and was added to the free list, but |
|
f44782f04dd4
7039627: G1: avoid BOT updates for survivor allocations and dirty survivor regions incrementally
tonyp
parents:
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diff
changeset
|
4047 // has been subseqently used to allocate a humongous |
|
f44782f04dd4
7039627: G1: avoid BOT updates for survivor allocations and dirty survivor regions incrementally
tonyp
parents:
3824
diff
changeset
|
4048 // object that may be less than the region size). |
|
f44782f04dd4
7039627: G1: avoid BOT updates for survivor allocations and dirty survivor regions incrementally
tonyp
parents:
3824
diff
changeset
|
4049 if (retained_region != NULL && |
|
f44782f04dd4
7039627: G1: avoid BOT updates for survivor allocations and dirty survivor regions incrementally
tonyp
parents:
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diff
changeset
|
4050 !retained_region->in_collection_set() && |
|
f44782f04dd4
7039627: G1: avoid BOT updates for survivor allocations and dirty survivor regions incrementally
tonyp
parents:
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diff
changeset
|
4051 !(retained_region->top() == retained_region->end()) && |
|
f44782f04dd4
7039627: G1: avoid BOT updates for survivor allocations and dirty survivor regions incrementally
tonyp
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diff
changeset
|
4052 !retained_region->is_empty() && |
|
f44782f04dd4
7039627: G1: avoid BOT updates for survivor allocations and dirty survivor regions incrementally
tonyp
parents:
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diff
changeset
|
4053 !retained_region->isHumongous()) { |
|
f44782f04dd4
7039627: G1: avoid BOT updates for survivor allocations and dirty survivor regions incrementally
tonyp
parents:
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diff
changeset
|
4054 retained_region->set_saved_mark(); |
| 4072 | 4055 // The retained region was added to the old region set when it was |
| 4056 // retired. We have to remove it now, since we don't allow regions | |
| 4057 // we allocate to in the region sets. We'll re-add it later, when | |
| 4058 // it's retired again. | |
| 4059 _old_set.remove(retained_region); | |
|
4787
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
4785
diff
changeset
|
4060 bool during_im = g1_policy()->during_initial_mark_pause(); |
|
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
4785
diff
changeset
|
4061 retained_region->note_start_of_copying(during_im); |
|
3830
f44782f04dd4
7039627: G1: avoid BOT updates for survivor allocations and dirty survivor regions incrementally
tonyp
parents:
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diff
changeset
|
4062 _old_gc_alloc_region.set(retained_region); |
|
f44782f04dd4
7039627: G1: avoid BOT updates for survivor allocations and dirty survivor regions incrementally
tonyp
parents:
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diff
changeset
|
4063 _hr_printer.reuse(retained_region); |
| 342 | 4064 } |
| 4065 } | |
| 4066 | |
|
3830
f44782f04dd4
7039627: G1: avoid BOT updates for survivor allocations and dirty survivor regions incrementally
tonyp
parents:
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diff
changeset
|
4067 void G1CollectedHeap::release_gc_alloc_regions() { |
|
f44782f04dd4
7039627: G1: avoid BOT updates for survivor allocations and dirty survivor regions incrementally
tonyp
parents:
3824
diff
changeset
|
4068 _survivor_gc_alloc_region.release(); |
|
f44782f04dd4
7039627: G1: avoid BOT updates for survivor allocations and dirty survivor regions incrementally
tonyp
parents:
3824
diff
changeset
|
4069 // If we have an old GC alloc region to release, we'll save it in |
|
f44782f04dd4
7039627: G1: avoid BOT updates for survivor allocations and dirty survivor regions incrementally
tonyp
parents:
3824
diff
changeset
|
4070 // _retained_old_gc_alloc_region. If we don't |
|
f44782f04dd4
7039627: G1: avoid BOT updates for survivor allocations and dirty survivor regions incrementally
tonyp
parents:
3824
diff
changeset
|
4071 // _retained_old_gc_alloc_region will become NULL. This is what we |
|
f44782f04dd4
7039627: G1: avoid BOT updates for survivor allocations and dirty survivor regions incrementally
tonyp
parents:
3824
diff
changeset
|
4072 // want either way so no reason to check explicitly for either |
|
f44782f04dd4
7039627: G1: avoid BOT updates for survivor allocations and dirty survivor regions incrementally
tonyp
parents:
3824
diff
changeset
|
4073 // condition. |
|
f44782f04dd4
7039627: G1: avoid BOT updates for survivor allocations and dirty survivor regions incrementally
tonyp
parents:
3824
diff
changeset
|
4074 _retained_old_gc_alloc_region = _old_gc_alloc_region.release(); |
| 342 | 4075 } |
| 4076 | |
|
3830
f44782f04dd4
7039627: G1: avoid BOT updates for survivor allocations and dirty survivor regions incrementally
tonyp
parents:
3824
diff
changeset
|
4077 void G1CollectedHeap::abandon_gc_alloc_regions() { |
|
f44782f04dd4
7039627: G1: avoid BOT updates for survivor allocations and dirty survivor regions incrementally
tonyp
parents:
3824
diff
changeset
|
4078 assert(_survivor_gc_alloc_region.get() == NULL, "pre-condition"); |
|
f44782f04dd4
7039627: G1: avoid BOT updates for survivor allocations and dirty survivor regions incrementally
tonyp
parents:
3824
diff
changeset
|
4079 assert(_old_gc_alloc_region.get() == NULL, "pre-condition"); |
|
f44782f04dd4
7039627: G1: avoid BOT updates for survivor allocations and dirty survivor regions incrementally
tonyp
parents:
3824
diff
changeset
|
4080 _retained_old_gc_alloc_region = NULL; |
| 342 | 4081 } |
| 4082 | |
| 4083 void G1CollectedHeap::init_for_evac_failure(OopsInHeapRegionClosure* cl) { | |
| 4084 _drain_in_progress = false; | |
| 4085 set_evac_failure_closure(cl); | |
| 4086 _evac_failure_scan_stack = new (ResourceObj::C_HEAP) GrowableArray<oop>(40, true); | |
| 4087 } | |
| 4088 | |
| 4089 void G1CollectedHeap::finalize_for_evac_failure() { | |
| 4090 assert(_evac_failure_scan_stack != NULL && | |
| 4091 _evac_failure_scan_stack->length() == 0, | |
| 4092 "Postcondition"); | |
| 4093 assert(!_drain_in_progress, "Postcondition"); | |
| 1045 | 4094 delete _evac_failure_scan_stack; |
| 342 | 4095 _evac_failure_scan_stack = NULL; |
| 4096 } | |
| 4097 | |
| 4098 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
|
4099 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
|
4100 |
|
023652e49ac0
7121496: G1: do the per-region evacuation failure handling work in parallel
johnc
parents:
4781
diff
changeset
|
4101 G1ParRemoveSelfForwardPtrsTask rsfp_task(this); |
|
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 if (G1CollectedHeap::use_parallel_gc_threads()) { |
|
023652e49ac0
7121496: G1: do the per-region evacuation failure handling work in parallel
johnc
parents:
4781
diff
changeset
|
4104 set_par_threads(); |
|
023652e49ac0
7121496: G1: do the per-region evacuation failure handling work in parallel
johnc
parents:
4781
diff
changeset
|
4105 workers()->run_task(&rsfp_task); |
|
023652e49ac0
7121496: G1: do the per-region evacuation failure handling work in parallel
johnc
parents:
4781
diff
changeset
|
4106 set_par_threads(0); |
|
616
4f360ec815ba
6720309: G1: don't synchronously update RSet during evacuation pauses
iveresov
parents:
595
diff
changeset
|
4107 } else { |
|
4783
023652e49ac0
7121496: G1: do the per-region evacuation failure handling work in parallel
johnc
parents:
4781
diff
changeset
|
4108 rsfp_task.work(0); |
|
023652e49ac0
7121496: G1: do the per-region evacuation failure handling work in parallel
johnc
parents:
4781
diff
changeset
|
4109 } |
|
023652e49ac0
7121496: G1: do the per-region evacuation failure handling work in parallel
johnc
parents:
4781
diff
changeset
|
4110 |
|
023652e49ac0
7121496: G1: do the per-region evacuation failure handling work in parallel
johnc
parents:
4781
diff
changeset
|
4111 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
|
4112 |
|
023652e49ac0
7121496: G1: do the per-region evacuation failure handling work in parallel
johnc
parents:
4781
diff
changeset
|
4113 // 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
|
4114 reset_cset_heap_region_claim_values(); |
|
023652e49ac0
7121496: G1: do the per-region evacuation failure handling work in parallel
johnc
parents:
4781
diff
changeset
|
4115 |
|
023652e49ac0
7121496: G1: do the per-region evacuation failure handling work in parallel
johnc
parents:
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diff
changeset
|
4116 assert(check_cset_heap_region_claim_values(HeapRegion::InitialClaimValue), "sanity"); |
| 342 | 4117 |
| 4118 // Now restore saved marks, if any. | |
| 4119 if (_objs_with_preserved_marks != NULL) { | |
| 4120 assert(_preserved_marks_of_objs != NULL, "Both or none."); | |
| 4121 guarantee(_objs_with_preserved_marks->length() == | |
| 4122 _preserved_marks_of_objs->length(), "Both or none."); | |
| 4123 for (int i = 0; i < _objs_with_preserved_marks->length(); i++) { | |
| 4124 oop obj = _objs_with_preserved_marks->at(i); | |
| 4125 markOop m = _preserved_marks_of_objs->at(i); | |
| 4126 obj->set_mark(m); | |
| 4127 } | |
|
4783
023652e49ac0
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johnc
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diff
changeset
|
4128 |
| 342 | 4129 // Delete the preserved marks growable arrays (allocated on the C heap). |
| 4130 delete _objs_with_preserved_marks; | |
| 4131 delete _preserved_marks_of_objs; | |
| 4132 _objs_with_preserved_marks = NULL; | |
| 4133 _preserved_marks_of_objs = NULL; | |
| 4134 } | |
| 4135 } | |
| 4136 | |
| 4137 void G1CollectedHeap::push_on_evac_failure_scan_stack(oop obj) { | |
| 4138 _evac_failure_scan_stack->push(obj); | |
| 4139 } | |
| 4140 | |
| 4141 void G1CollectedHeap::drain_evac_failure_scan_stack() { | |
| 4142 assert(_evac_failure_scan_stack != NULL, "precondition"); | |
| 4143 | |
| 4144 while (_evac_failure_scan_stack->length() > 0) { | |
| 4145 oop obj = _evac_failure_scan_stack->pop(); | |
| 4146 _evac_failure_closure->set_region(heap_region_containing(obj)); | |
| 4147 obj->oop_iterate_backwards(_evac_failure_closure); | |
| 4148 } | |
| 4149 } | |
| 4150 | |
| 4151 oop | |
| 4152 G1CollectedHeap::handle_evacuation_failure_par(OopsInHeapRegionClosure* cl, | |
|
4787
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
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4785
diff
changeset
|
4153 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
|
4154 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
|
4155 err_msg("obj: "PTR_FORMAT" should still be in the CSet", |
|
75af3e8de182
7040450: G1: assert((_g1->evacuation_failed()) || (!_g1->obj_in_cs(obj))) failed: shouldn't still be in ...
tonyp
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3317
diff
changeset
|
4156 (HeapWord*) old)); |
| 342 | 4157 markOop m = old->mark(); |
| 4158 oop forward_ptr = old->forward_to_atomic(old); | |
| 4159 if (forward_ptr == NULL) { | |
| 4160 // 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
|
4161 |
| 342 | 4162 if (_evac_failure_closure != cl) { |
| 4163 MutexLockerEx x(EvacFailureStack_lock, Mutex::_no_safepoint_check_flag); | |
| 4164 assert(!_drain_in_progress, | |
| 4165 "Should only be true while someone holds the lock."); | |
| 4166 // Set the global evac-failure closure to the current thread's. | |
| 4167 assert(_evac_failure_closure == NULL, "Or locking has failed."); | |
| 4168 set_evac_failure_closure(cl); | |
| 4169 // Now do the common part. | |
| 4170 handle_evacuation_failure_common(old, m); | |
| 4171 // Reset to NULL. | |
| 4172 set_evac_failure_closure(NULL); | |
| 4173 } else { | |
| 4174 // The lock is already held, and this is recursive. | |
| 4175 assert(_drain_in_progress, "This should only be the recursive case."); | |
| 4176 handle_evacuation_failure_common(old, m); | |
| 4177 } | |
| 4178 return old; | |
| 4179 } else { | |
|
3323
75af3e8de182
7040450: G1: assert((_g1->evacuation_failed()) || (!_g1->obj_in_cs(obj))) failed: shouldn't still be in ...
tonyp
parents:
3317
diff
changeset
|
4180 // Forward-to-self failed. Either someone else managed to allocate |
|
75af3e8de182
7040450: G1: assert((_g1->evacuation_failed()) || (!_g1->obj_in_cs(obj))) failed: shouldn't still be in ...
tonyp
parents:
3317
diff
changeset
|
4181 // space for this object (old != forward_ptr) or they beat us in |
|
75af3e8de182
7040450: G1: assert((_g1->evacuation_failed()) || (!_g1->obj_in_cs(obj))) failed: shouldn't still be in ...
tonyp
parents:
3317
diff
changeset
|
4182 // self-forwarding it (old == forward_ptr). |
|
75af3e8de182
7040450: G1: assert((_g1->evacuation_failed()) || (!_g1->obj_in_cs(obj))) failed: shouldn't still be in ...
tonyp
parents:
3317
diff
changeset
|
4183 assert(old == forward_ptr || !obj_in_cs(forward_ptr), |
|
75af3e8de182
7040450: G1: assert((_g1->evacuation_failed()) || (!_g1->obj_in_cs(obj))) failed: shouldn't still be in ...
tonyp
parents:
3317
diff
changeset
|
4184 err_msg("obj: "PTR_FORMAT" forwarded to: "PTR_FORMAT" " |
|
75af3e8de182
7040450: G1: assert((_g1->evacuation_failed()) || (!_g1->obj_in_cs(obj))) failed: shouldn't still be in ...
tonyp
parents:
3317
diff
changeset
|
4185 "should not be in the CSet", |
|
75af3e8de182
7040450: G1: assert((_g1->evacuation_failed()) || (!_g1->obj_in_cs(obj))) failed: shouldn't still be in ...
tonyp
parents:
3317
diff
changeset
|
4186 (HeapWord*) old, (HeapWord*) forward_ptr)); |
| 342 | 4187 return forward_ptr; |
| 4188 } | |
| 4189 } | |
| 4190 | |
| 4191 void G1CollectedHeap::handle_evacuation_failure_common(oop old, markOop m) { | |
| 4192 set_evacuation_failed(true); | |
| 4193 | |
| 4194 preserve_mark_if_necessary(old, m); | |
| 4195 | |
| 4196 HeapRegion* r = heap_region_containing(old); | |
| 4197 if (!r->evacuation_failed()) { | |
| 4198 r->set_evacuation_failed(true); | |
|
3778
5f6f2615433a
7049999: G1: Make the G1PrintHeapRegions output consistent and complete
tonyp
parents:
3777
diff
changeset
|
4199 _hr_printer.evac_failure(r); |
| 342 | 4200 } |
| 4201 | |
| 4202 push_on_evac_failure_scan_stack(old); | |
| 4203 | |
| 4204 if (!_drain_in_progress) { | |
| 4205 // prevent recursion in copy_to_survivor_space() | |
| 4206 _drain_in_progress = true; | |
| 4207 drain_evac_failure_scan_stack(); | |
| 4208 _drain_in_progress = false; | |
| 4209 } | |
| 4210 } | |
| 4211 | |
| 4212 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
|
4213 assert(evacuation_failed(), "Oversaving!"); |
|
74ee0db180fa
6807801: CMS: could save/restore fewer header words during scavenge
ysr
parents:
2037
diff
changeset
|
4214 // 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
|
4215 // case of a promotion failure. |
|
74ee0db180fa
6807801: CMS: could save/restore fewer header words during scavenge
ysr
parents:
2037
diff
changeset
|
4216 if (m->must_be_preserved_for_promotion_failure(obj)) { |
| 342 | 4217 if (_objs_with_preserved_marks == NULL) { |
| 4218 assert(_preserved_marks_of_objs == NULL, "Both or none."); | |
| 4219 _objs_with_preserved_marks = | |
| 4220 new (ResourceObj::C_HEAP) GrowableArray<oop>(40, true); | |
| 4221 _preserved_marks_of_objs = | |
| 4222 new (ResourceObj::C_HEAP) GrowableArray<markOop>(40, true); | |
| 4223 } | |
| 4224 _objs_with_preserved_marks->push(obj); | |
| 4225 _preserved_marks_of_objs->push(m); | |
| 4226 } | |
| 4227 } | |
| 4228 | |
| 4229 HeapWord* G1CollectedHeap::par_allocate_during_gc(GCAllocPurpose purpose, | |
| 4230 size_t word_size) { | |
|
3830
f44782f04dd4
7039627: G1: avoid BOT updates for survivor allocations and dirty survivor regions incrementally
tonyp
parents:
3824
diff
changeset
|
4231 if (purpose == GCAllocForSurvived) { |
|
f44782f04dd4
7039627: G1: avoid BOT updates for survivor allocations and dirty survivor regions incrementally
tonyp
parents:
3824
diff
changeset
|
4232 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
|
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 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
|
4237 // object there. |
|
f44782f04dd4
7039627: G1: avoid BOT updates for survivor allocations and dirty survivor regions incrementally
tonyp
parents:
3824
diff
changeset
|
4238 return old_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 } else { |
|
f44782f04dd4
7039627: G1: avoid BOT updates for survivor allocations and dirty survivor regions incrementally
tonyp
parents:
3824
diff
changeset
|
4241 assert(purpose == GCAllocForTenured, "sanity"); |
|
f44782f04dd4
7039627: G1: avoid BOT updates for survivor allocations and dirty survivor regions incrementally
tonyp
parents:
3824
diff
changeset
|
4242 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
|
4243 if (result != NULL) { |
|
f44782f04dd4
7039627: G1: avoid BOT updates for survivor allocations and dirty survivor regions incrementally
tonyp
parents:
3824
diff
changeset
|
4244 return result; |
| 342 | 4245 } else { |
|
3830
f44782f04dd4
7039627: G1: avoid BOT updates for survivor allocations and dirty survivor regions incrementally
tonyp
parents:
3824
diff
changeset
|
4246 // 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
|
4247 // object there. |
|
f44782f04dd4
7039627: G1: avoid BOT updates for survivor allocations and dirty survivor regions incrementally
tonyp
parents:
3824
diff
changeset
|
4248 return survivor_attempt_allocation(word_size); |
| 342 | 4249 } |
|
3830
f44782f04dd4
7039627: G1: avoid BOT updates for survivor allocations and dirty survivor regions incrementally
tonyp
parents:
3824
diff
changeset
|
4250 } |
|
f44782f04dd4
7039627: G1: avoid BOT updates for survivor allocations and dirty survivor regions incrementally
tonyp
parents:
3824
diff
changeset
|
4251 |
|
f44782f04dd4
7039627: G1: avoid BOT updates for survivor allocations and dirty survivor regions incrementally
tonyp
parents:
3824
diff
changeset
|
4252 ShouldNotReachHere(); |
|
f44782f04dd4
7039627: G1: avoid BOT updates for survivor allocations and dirty survivor regions incrementally
tonyp
parents:
3824
diff
changeset
|
4253 // 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
|
4254 return NULL; |
| 342 | 4255 } |
| 4256 | |
|
3886
eeae91c9baba
7080389: G1: refactor marking code in evacuation pause copy closures
johnc
parents:
3869
diff
changeset
|
4257 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
|
4258 ParGCAllocBuffer(gclab_word_size), _retired(false) { } |
|
3886
eeae91c9baba
7080389: G1: refactor marking code in evacuation pause copy closures
johnc
parents:
3869
diff
changeset
|
4259 |
|
4836
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4834
diff
changeset
|
4260 G1ParScanThreadState::G1ParScanThreadState(G1CollectedHeap* g1h, uint queue_num) |
|
845
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
ysr
parents:
838
diff
changeset
|
4261 : _g1h(g1h), |
|
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
ysr
parents:
838
diff
changeset
|
4262 _refs(g1h->task_queue(queue_num)), |
|
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
ysr
parents:
838
diff
changeset
|
4263 _dcq(&g1h->dirty_card_queue_set()), |
|
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
ysr
parents:
838
diff
changeset
|
4264 _ct_bs((CardTableModRefBS*)_g1h->barrier_set()), |
|
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
ysr
parents:
838
diff
changeset
|
4265 _g1_rem(g1h->g1_rem_set()), |
|
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
ysr
parents:
838
diff
changeset
|
4266 _hash_seed(17), _queue_num(queue_num), |
|
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
ysr
parents:
838
diff
changeset
|
4267 _term_attempts(0), |
|
1391
79e419e5ea3b
6942253: G1: replace G1ParallelGCAllocBufferSize with YoungPLABSize and OldPLABSize
apetrusenko
parents:
1390
diff
changeset
|
4268 _surviving_alloc_buffer(g1h->desired_plab_sz(GCAllocForSurvived)), |
|
79e419e5ea3b
6942253: G1: replace G1ParallelGCAllocBufferSize with YoungPLABSize and OldPLABSize
apetrusenko
parents:
1390
diff
changeset
|
4269 _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
|
4270 _age_table(false), |
|
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
ysr
parents:
838
diff
changeset
|
4271 _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
|
4272 _alloc_buffer_waste(0), _undo_waste(0) { |
|
845
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
ysr
parents:
838
diff
changeset
|
4273 // we allocate G1YoungSurvRateNumRegions plus one entries, since |
|
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
ysr
parents:
838
diff
changeset
|
4274 // 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
|
4275 // non-young regions (where the age is -1) |
|
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
ysr
parents:
838
diff
changeset
|
4276 // 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
|
4277 // an attempt to eliminate cache contention |
|
6010
720b6a76dd9d
7157073: G1: type change size_t -> uint for region counts / indexes
tonyp
parents:
6008
diff
changeset
|
4278 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
|
4279 uint array_length = PADDING_ELEM_NUM + |
|
720b6a76dd9d
7157073: G1: type change size_t -> uint for region counts / indexes
tonyp
parents:
6008
diff
changeset
|
4280 real_length + |
|
720b6a76dd9d
7157073: G1: type change size_t -> uint for region counts / indexes
tonyp
parents:
6008
diff
changeset
|
4281 PADDING_ELEM_NUM; |
|
845
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
ysr
parents:
838
diff
changeset
|
4282 _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
|
4283 if (_surviving_young_words_base == NULL) |
|
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
ysr
parents:
838
diff
changeset
|
4284 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
|
4285 "Not enough space for young surv histo."); |
|
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
ysr
parents:
838
diff
changeset
|
4286 _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
|
4287 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
|
4288 |
|
1391
79e419e5ea3b
6942253: G1: replace G1ParallelGCAllocBufferSize with YoungPLABSize and OldPLABSize
apetrusenko
parents:
1390
diff
changeset
|
4289 _alloc_buffers[GCAllocForSurvived] = &_surviving_alloc_buffer; |
|
79e419e5ea3b
6942253: G1: replace G1ParallelGCAllocBufferSize with YoungPLABSize and OldPLABSize
apetrusenko
parents:
1390
diff
changeset
|
4290 _alloc_buffers[GCAllocForTenured] = &_tenured_alloc_buffer; |
|
79e419e5ea3b
6942253: G1: replace G1ParallelGCAllocBufferSize with YoungPLABSize and OldPLABSize
apetrusenko
parents:
1390
diff
changeset
|
4291 |
|
845
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
ysr
parents:
838
diff
changeset
|
4292 _start = os::elapsedTime(); |
|
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
ysr
parents:
838
diff
changeset
|
4293 } |
| 342 | 4294 |
| 1709 | 4295 void |
| 4296 G1ParScanThreadState::print_termination_stats_hdr(outputStream* const st) | |
| 4297 { | |
| 4298 st->print_raw_cr("GC Termination Stats"); | |
| 4299 st->print_raw_cr(" elapsed --strong roots-- -------termination-------" | |
| 4300 " ------waste (KiB)------"); | |
| 4301 st->print_raw_cr("thr ms ms % ms % attempts" | |
| 4302 " total alloc undo"); | |
| 4303 st->print_raw_cr("--- --------- --------- ------ --------- ------ --------" | |
| 4304 " ------- ------- -------"); | |
| 4305 } | |
| 4306 | |
| 4307 void | |
| 4308 G1ParScanThreadState::print_termination_stats(int i, | |
| 4309 outputStream* const st) const | |
| 4310 { | |
| 4311 const double elapsed_ms = elapsed_time() * 1000.0; | |
| 4312 const double s_roots_ms = strong_roots_time() * 1000.0; | |
| 4313 const double term_ms = term_time() * 1000.0; | |
| 4314 st->print_cr("%3d %9.2f %9.2f %6.2f " | |
| 4315 "%9.2f %6.2f " SIZE_FORMAT_W(8) " " | |
| 4316 SIZE_FORMAT_W(7) " " SIZE_FORMAT_W(7) " " SIZE_FORMAT_W(7), | |
| 4317 i, elapsed_ms, s_roots_ms, s_roots_ms * 100 / elapsed_ms, | |
| 4318 term_ms, term_ms * 100 / elapsed_ms, term_attempts(), | |
| 4319 (alloc_buffer_waste() + undo_waste()) * HeapWordSize / K, | |
| 4320 alloc_buffer_waste() * HeapWordSize / K, | |
| 4321 undo_waste() * HeapWordSize / K); | |
| 4322 } | |
| 4323 | |
|
1862
b14ec34b1e07
6989448: G1: refactor and simplify G1ParScanThreadState
jcoomes
parents:
1861
diff
changeset
|
4324 #ifdef ASSERT |
|
b14ec34b1e07
6989448: G1: refactor and simplify G1ParScanThreadState
jcoomes
parents:
1861
diff
changeset
|
4325 bool G1ParScanThreadState::verify_ref(narrowOop* 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 assert(UseCompressedOops, "sanity"); |
|
b14ec34b1e07
6989448: G1: refactor and simplify G1ParScanThreadState
jcoomes
parents:
1861
diff
changeset
|
4328 assert(!has_partial_array_mask(ref), err_msg("ref=" PTR_FORMAT, ref)); |
|
b14ec34b1e07
6989448: G1: refactor and simplify G1ParScanThreadState
jcoomes
parents:
1861
diff
changeset
|
4329 oop p = oopDesc::load_decode_heap_oop(ref); |
|
b14ec34b1e07
6989448: G1: refactor and simplify G1ParScanThreadState
jcoomes
parents:
1861
diff
changeset
|
4330 assert(_g1h->is_in_g1_reserved(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 return true; |
|
b14ec34b1e07
6989448: G1: refactor and simplify G1ParScanThreadState
jcoomes
parents:
1861
diff
changeset
|
4333 } |
|
b14ec34b1e07
6989448: G1: refactor and simplify G1ParScanThreadState
jcoomes
parents:
1861
diff
changeset
|
4334 |
|
b14ec34b1e07
6989448: G1: refactor and simplify G1ParScanThreadState
jcoomes
parents:
1861
diff
changeset
|
4335 bool G1ParScanThreadState::verify_ref(oop* ref) const { |
|
b14ec34b1e07
6989448: G1: refactor and simplify G1ParScanThreadState
jcoomes
parents:
1861
diff
changeset
|
4336 assert(ref != NULL, "invariant"); |
|
b14ec34b1e07
6989448: G1: refactor and simplify G1ParScanThreadState
jcoomes
parents:
1861
diff
changeset
|
4337 if (has_partial_array_mask(ref)) { |
|
b14ec34b1e07
6989448: G1: refactor and simplify G1ParScanThreadState
jcoomes
parents:
1861
diff
changeset
|
4338 // Must be in the collection set--it's already been copied. |
|
b14ec34b1e07
6989448: G1: refactor and simplify G1ParScanThreadState
jcoomes
parents:
1861
diff
changeset
|
4339 oop p = clear_partial_array_mask(ref); |
|
b14ec34b1e07
6989448: G1: refactor and simplify G1ParScanThreadState
jcoomes
parents:
1861
diff
changeset
|
4340 assert(_g1h->obj_in_cs(p), |
|
b14ec34b1e07
6989448: G1: refactor and simplify G1ParScanThreadState
jcoomes
parents:
1861
diff
changeset
|
4341 err_msg("ref=" PTR_FORMAT " p=" PTR_FORMAT, ref, intptr_t(p))); |
|
b14ec34b1e07
6989448: G1: refactor and simplify G1ParScanThreadState
jcoomes
parents:
1861
diff
changeset
|
4342 } else { |
|
b14ec34b1e07
6989448: G1: refactor and simplify G1ParScanThreadState
jcoomes
parents:
1861
diff
changeset
|
4343 oop p = oopDesc::load_decode_heap_oop(ref); |
|
b14ec34b1e07
6989448: G1: refactor and simplify G1ParScanThreadState
jcoomes
parents:
1861
diff
changeset
|
4344 assert(_g1h->is_in_g1_reserved(p), |
|
b14ec34b1e07
6989448: G1: refactor and simplify G1ParScanThreadState
jcoomes
parents:
1861
diff
changeset
|
4345 err_msg("ref=" PTR_FORMAT " p=" PTR_FORMAT, ref, intptr_t(p))); |
|
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 return true; |
|
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 |
|
b14ec34b1e07
6989448: G1: refactor and simplify G1ParScanThreadState
jcoomes
parents:
1861
diff
changeset
|
4350 bool G1ParScanThreadState::verify_task(StarTask ref) const { |
|
b14ec34b1e07
6989448: G1: refactor and simplify G1ParScanThreadState
jcoomes
parents:
1861
diff
changeset
|
4351 if (ref.is_narrow()) { |
|
b14ec34b1e07
6989448: G1: refactor and simplify G1ParScanThreadState
jcoomes
parents:
1861
diff
changeset
|
4352 return verify_ref((narrowOop*) ref); |
|
b14ec34b1e07
6989448: G1: refactor and simplify G1ParScanThreadState
jcoomes
parents:
1861
diff
changeset
|
4353 } else { |
|
b14ec34b1e07
6989448: G1: refactor and simplify G1ParScanThreadState
jcoomes
parents:
1861
diff
changeset
|
4354 return verify_ref((oop*) ref); |
|
b14ec34b1e07
6989448: G1: refactor and simplify G1ParScanThreadState
jcoomes
parents:
1861
diff
changeset
|
4355 } |
|
b14ec34b1e07
6989448: G1: refactor and simplify G1ParScanThreadState
jcoomes
parents:
1861
diff
changeset
|
4356 } |
|
b14ec34b1e07
6989448: G1: refactor and simplify G1ParScanThreadState
jcoomes
parents:
1861
diff
changeset
|
4357 #endif // ASSERT |
|
b14ec34b1e07
6989448: G1: refactor and simplify G1ParScanThreadState
jcoomes
parents:
1861
diff
changeset
|
4358 |
|
b14ec34b1e07
6989448: G1: refactor and simplify G1ParScanThreadState
jcoomes
parents:
1861
diff
changeset
|
4359 void G1ParScanThreadState::trim_queue() { |
|
3979
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
4360 assert(_evac_cl != NULL, "not set"); |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
4361 assert(_evac_failure_cl != NULL, "not set"); |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
4362 assert(_partial_scan_cl != NULL, "not set"); |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
4363 |
|
1862
b14ec34b1e07
6989448: G1: refactor and simplify G1ParScanThreadState
jcoomes
parents:
1861
diff
changeset
|
4364 StarTask ref; |
|
b14ec34b1e07
6989448: G1: refactor and simplify G1ParScanThreadState
jcoomes
parents:
1861
diff
changeset
|
4365 do { |
|
b14ec34b1e07
6989448: G1: refactor and simplify G1ParScanThreadState
jcoomes
parents:
1861
diff
changeset
|
4366 // Drain the overflow stack first, so other threads can steal. |
|
b14ec34b1e07
6989448: G1: refactor and simplify G1ParScanThreadState
jcoomes
parents:
1861
diff
changeset
|
4367 while (refs()->pop_overflow(ref)) { |
|
b14ec34b1e07
6989448: G1: refactor and simplify G1ParScanThreadState
jcoomes
parents:
1861
diff
changeset
|
4368 deal_with_reference(ref); |
|
b14ec34b1e07
6989448: G1: refactor and simplify G1ParScanThreadState
jcoomes
parents:
1861
diff
changeset
|
4369 } |
|
3979
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
4370 |
|
1862
b14ec34b1e07
6989448: G1: refactor and simplify G1ParScanThreadState
jcoomes
parents:
1861
diff
changeset
|
4371 while (refs()->pop_local(ref)) { |
|
b14ec34b1e07
6989448: G1: refactor and simplify G1ParScanThreadState
jcoomes
parents:
1861
diff
changeset
|
4372 deal_with_reference(ref); |
|
b14ec34b1e07
6989448: G1: refactor and simplify G1ParScanThreadState
jcoomes
parents:
1861
diff
changeset
|
4373 } |
|
b14ec34b1e07
6989448: G1: refactor and simplify G1ParScanThreadState
jcoomes
parents:
1861
diff
changeset
|
4374 } while (!refs()->is_empty()); |
|
b14ec34b1e07
6989448: G1: refactor and simplify G1ParScanThreadState
jcoomes
parents:
1861
diff
changeset
|
4375 } |
|
b14ec34b1e07
6989448: G1: refactor and simplify G1ParScanThreadState
jcoomes
parents:
1861
diff
changeset
|
4376 |
|
4787
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
4785
diff
changeset
|
4377 G1ParClosureSuper::G1ParClosureSuper(G1CollectedHeap* g1, |
|
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
4785
diff
changeset
|
4378 G1ParScanThreadState* par_scan_state) : |
| 342 | 4379 _g1(g1), _g1_rem(_g1->g1_rem_set()), _cm(_g1->concurrent_mark()), |
|
3886
eeae91c9baba
7080389: G1: refactor marking code in evacuation pause copy closures
johnc
parents:
3869
diff
changeset
|
4380 _par_scan_state(par_scan_state), |
|
4836
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4834
diff
changeset
|
4381 _worker_id(par_scan_state->queue_num()), |
|
3886
eeae91c9baba
7080389: G1: refactor marking code in evacuation pause copy closures
johnc
parents:
3869
diff
changeset
|
4382 _during_initial_mark(_g1->g1_policy()->during_initial_mark_pause()), |
|
eeae91c9baba
7080389: G1: refactor marking code in evacuation pause copy closures
johnc
parents:
3869
diff
changeset
|
4383 _mark_in_progress(_g1->mark_in_progress()) { } |
|
eeae91c9baba
7080389: G1: refactor marking code in evacuation pause copy closures
johnc
parents:
3869
diff
changeset
|
4384 |
| 5987 | 4385 template <bool do_gen_barrier, G1Barrier barrier, bool do_mark_object> |
| 4386 void G1ParCopyClosure<do_gen_barrier, barrier, do_mark_object>::mark_object(oop obj) { | |
|
4787
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
4785
diff
changeset
|
4387 #ifdef ASSERT |
|
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
4785
diff
changeset
|
4388 HeapRegion* hr = _g1->heap_region_containing(obj); |
|
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
4785
diff
changeset
|
4389 assert(hr != NULL, "sanity"); |
|
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
4785
diff
changeset
|
4390 assert(!hr->in_collection_set(), "should not mark objects in the CSet"); |
|
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
4785
diff
changeset
|
4391 #endif // ASSERT |
|
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
4785
diff
changeset
|
4392 |
|
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
4785
diff
changeset
|
4393 // We know that the object is not moving so it's safe to read its size. |
|
4836
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4834
diff
changeset
|
4394 _cm->grayRoot(obj, (size_t) obj->size(), _worker_id); |
|
4787
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
4785
diff
changeset
|
4395 } |
|
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
4785
diff
changeset
|
4396 |
| 5987 | 4397 template <bool do_gen_barrier, G1Barrier barrier, bool do_mark_object> |
| 4398 void G1ParCopyClosure<do_gen_barrier, barrier, do_mark_object> | |
| 4399 ::mark_forwarded_object(oop from_obj, oop to_obj) { | |
|
4787
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
4785
diff
changeset
|
4400 #ifdef ASSERT |
|
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
4785
diff
changeset
|
4401 assert(from_obj->is_forwarded(), "from obj should be forwarded"); |
|
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
4785
diff
changeset
|
4402 assert(from_obj->forwardee() == to_obj, "to obj should be the forwardee"); |
|
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
4785
diff
changeset
|
4403 assert(from_obj != to_obj, "should not be self-forwarded"); |
|
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
4785
diff
changeset
|
4404 |
|
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
4785
diff
changeset
|
4405 HeapRegion* from_hr = _g1->heap_region_containing(from_obj); |
|
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
4785
diff
changeset
|
4406 assert(from_hr != NULL, "sanity"); |
|
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
4785
diff
changeset
|
4407 assert(from_hr->in_collection_set(), "from obj should be in the CSet"); |
|
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
4785
diff
changeset
|
4408 |
|
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
4785
diff
changeset
|
4409 HeapRegion* to_hr = _g1->heap_region_containing(to_obj); |
|
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
4785
diff
changeset
|
4410 assert(to_hr != NULL, "sanity"); |
|
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
4785
diff
changeset
|
4411 assert(!to_hr->in_collection_set(), "should not mark objects in the CSet"); |
|
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
4785
diff
changeset
|
4412 #endif // ASSERT |
|
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
4785
diff
changeset
|
4413 |
|
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
4785
diff
changeset
|
4414 // The object might be in the process of being copied by another |
|
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
4785
diff
changeset
|
4415 // worker so we cannot trust that its to-space image is |
|
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
4785
diff
changeset
|
4416 // well-formed. So we have to read its size from its from-space |
|
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
4785
diff
changeset
|
4417 // image which we know should not be changing. |
|
4836
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4834
diff
changeset
|
4418 _cm->grayRoot(to_obj, (size_t) from_obj->size(), _worker_id); |
|
4787
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
4785
diff
changeset
|
4419 } |
|
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
4785
diff
changeset
|
4420 |
| 5987 | 4421 template <bool do_gen_barrier, G1Barrier barrier, bool do_mark_object> |
| 4422 oop G1ParCopyClosure<do_gen_barrier, barrier, do_mark_object> | |
| 4423 ::copy_to_survivor_space(oop old) { | |
|
6010
720b6a76dd9d
7157073: G1: type change size_t -> uint for region counts / indexes
tonyp
parents:
6008
diff
changeset
|
4424 size_t word_sz = old->size(); |
| 342 | 4425 HeapRegion* from_region = _g1->heap_region_containing_raw(old); |
| 4426 // +1 to make the -1 indexes valid... | |
| 4427 int young_index = from_region->young_index_in_cset()+1; | |
|
4787
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
4785
diff
changeset
|
4428 assert( (from_region->is_young() && young_index > 0) || |
|
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
4785
diff
changeset
|
4429 (!from_region->is_young() && young_index == 0), "invariant" ); |
| 342 | 4430 G1CollectorPolicy* g1p = _g1->g1_policy(); |
| 4431 markOop m = old->mark(); | |
| 545 | 4432 int age = m->has_displaced_mark_helper() ? m->displaced_mark_helper()->age() |
| 4433 : m->age(); | |
| 4434 GCAllocPurpose alloc_purpose = g1p->evacuation_destination(from_region, age, | |
| 342 | 4435 word_sz); |
| 4436 HeapWord* obj_ptr = _par_scan_state->allocate(alloc_purpose, word_sz); | |
| 4437 oop obj = oop(obj_ptr); | |
| 4438 | |
| 4439 if (obj_ptr == NULL) { | |
| 4440 // This will either forward-to-self, or detect that someone else has | |
| 4441 // installed a forwarding pointer. | |
| 4442 OopsInHeapRegionClosure* cl = _par_scan_state->evac_failure_closure(); | |
|
4787
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
4785
diff
changeset
|
4443 return _g1->handle_evacuation_failure_par(cl, old); |
| 342 | 4444 } |
| 4445 | |
| 526 | 4446 // We're going to allocate linearly, so might as well prefetch ahead. |
| 4447 Prefetch::write(obj_ptr, PrefetchCopyIntervalInBytes); | |
| 4448 | |
| 342 | 4449 oop forward_ptr = old->forward_to_atomic(obj); |
| 4450 if (forward_ptr == NULL) { | |
| 4451 Copy::aligned_disjoint_words((HeapWord*) old, obj_ptr, word_sz); | |
| 526 | 4452 if (g1p->track_object_age(alloc_purpose)) { |
| 4453 // We could simply do obj->incr_age(). However, this causes a | |
| 4454 // performance issue. obj->incr_age() will first check whether | |
| 4455 // the object has a displaced mark by checking its mark word; | |
| 4456 // getting the mark word from the new location of the object | |
| 4457 // stalls. So, given that we already have the mark word and we | |
| 4458 // are about to install it anyway, it's better to increase the | |
| 4459 // age on the mark word, when the object does not have a | |
| 4460 // displaced mark word. We're not expecting many objects to have | |
| 4461 // a displaced marked word, so that case is not optimized | |
| 4462 // further (it could be...) and we simply call obj->incr_age(). | |
| 4463 | |
| 4464 if (m->has_displaced_mark_helper()) { | |
| 4465 // in this case, we have to install the mark word first, | |
| 4466 // otherwise obj looks to be forwarded (the old mark word, | |
| 4467 // which contains the forward pointer, was copied) | |
| 4468 obj->set_mark(m); | |
| 4469 obj->incr_age(); | |
| 4470 } else { | |
| 4471 m = m->incr_age(); | |
| 545 | 4472 obj->set_mark(m); |
| 526 | 4473 } |
| 545 | 4474 _par_scan_state->age_table()->add(obj, word_sz); |
| 4475 } else { | |
| 4476 obj->set_mark(m); | |
| 526 | 4477 } |
| 4478 | |
| 342 | 4479 size_t* surv_young_words = _par_scan_state->surviving_young_words(); |
| 4480 surv_young_words[young_index] += word_sz; | |
| 4481 | |
| 4482 if (obj->is_objArray() && arrayOop(obj)->length() >= ParGCArrayScanChunk) { | |
|
4784
02838862dec8
7121623: G1: always be able to reliably calculate the length of a forwarded chunked array
tonyp
parents:
4783
diff
changeset
|
4483 // 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
tonyp
parents:
4783
diff
changeset
|
4484 // 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
tonyp
parents:
4783
diff
changeset
|
4485 // length field of the from-space object. |
|
02838862dec8
7121623: G1: always be able to reliably calculate the length of a forwarded chunked array
tonyp
parents:
4783
diff
changeset
|
4486 arrayOop(obj)->set_length(0); |
|
845
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
ysr
parents:
838
diff
changeset
|
4487 oop* old_p = set_partial_array_mask(old); |
|
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
ysr
parents:
838
diff
changeset
|
4488 _par_scan_state->push_on_queue(old_p); |
| 342 | 4489 } else { |
| 526 | 4490 // No point in using the slower heap_region_containing() method, |
| 4491 // given that we know obj is in the heap. | |
| 5987 | 4492 _scanner.set_region(_g1->heap_region_containing_raw(obj)); |
| 4493 obj->oop_iterate_backwards(&_scanner); | |
| 342 | 4494 } |
| 4495 } else { | |
| 4496 _par_scan_state->undo_allocation(alloc_purpose, obj_ptr, word_sz); | |
| 4497 obj = forward_ptr; | |
| 4498 } | |
| 4499 return obj; | |
| 4500 } | |
| 4501 | |
|
3886
eeae91c9baba
7080389: G1: refactor marking code in evacuation pause copy closures
johnc
parents:
3869
diff
changeset
|
4502 template <bool do_gen_barrier, G1Barrier barrier, bool do_mark_object> |
|
845
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
ysr
parents:
838
diff
changeset
|
4503 template <class T> |
|
3886
eeae91c9baba
7080389: G1: refactor marking code in evacuation pause copy closures
johnc
parents:
3869
diff
changeset
|
4504 void G1ParCopyClosure<do_gen_barrier, barrier, do_mark_object> |
|
845
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
ysr
parents:
838
diff
changeset
|
4505 ::do_oop_work(T* p) { |
|
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
ysr
parents:
838
diff
changeset
|
4506 oop obj = oopDesc::load_decode_heap_oop(p); |
| 342 | 4507 assert(barrier != G1BarrierRS || obj != NULL, |
|
4787
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
4785
diff
changeset
|
4508 "Precondition: G1BarrierRS implies obj is non-NULL"); |
|
3886
eeae91c9baba
7080389: G1: refactor marking code in evacuation pause copy closures
johnc
parents:
3869
diff
changeset
|
4509 |
|
4836
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4834
diff
changeset
|
4510 assert(_worker_id == _par_scan_state->queue_num(), "sanity"); |
|
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4834
diff
changeset
|
4511 |
| 526 | 4512 // here the null check is implicit in the cset_fast_test() test |
|
1261
0414c1049f15
6923991: G1: improve scalability of RSet scanning
iveresov
parents:
1245
diff
changeset
|
4513 if (_g1->in_cset_fast_test(obj)) { |
|
4787
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
4785
diff
changeset
|
4514 oop forwardee; |
| 526 | 4515 if (obj->is_forwarded()) { |
|
4787
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
4785
diff
changeset
|
4516 forwardee = obj->forwardee(); |
| 526 | 4517 } else { |
|
4787
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
4785
diff
changeset
|
4518 forwardee = copy_to_survivor_space(obj); |
| 342 | 4519 } |
|
4787
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
4785
diff
changeset
|
4520 assert(forwardee != NULL, "forwardee should not be NULL"); |
|
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
4785
diff
changeset
|
4521 oopDesc::encode_store_heap_oop(p, forwardee); |
|
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
4785
diff
changeset
|
4522 if (do_mark_object && forwardee != obj) { |
|
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
4785
diff
changeset
|
4523 // If the object is self-forwarded we don't need to explicitly |
|
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
4785
diff
changeset
|
4524 // mark it, the evacuation failure protocol will do so. |
|
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
4785
diff
changeset
|
4525 mark_forwarded_object(obj, forwardee); |
|
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
4785
diff
changeset
|
4526 } |
|
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
4785
diff
changeset
|
4527 |
| 526 | 4528 // When scanning the RS, we only care about objs in CS. |
| 4529 if (barrier == G1BarrierRS) { | |
|
4836
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4834
diff
changeset
|
4530 _par_scan_state->update_rs(_from, p, _worker_id); |
| 342 | 4531 } |
|
3886
eeae91c9baba
7080389: G1: refactor marking code in evacuation pause copy closures
johnc
parents:
3869
diff
changeset
|
4532 } else { |
|
eeae91c9baba
7080389: G1: refactor marking code in evacuation pause copy closures
johnc
parents:
3869
diff
changeset
|
4533 // The object is not in collection set. If we're a root scanning |
|
eeae91c9baba
7080389: G1: refactor marking code in evacuation pause copy closures
johnc
parents:
3869
diff
changeset
|
4534 // closure during an initial mark pause (i.e. do_mark_object will |
|
eeae91c9baba
7080389: G1: refactor marking code in evacuation pause copy closures
johnc
parents:
3869
diff
changeset
|
4535 // be true) then attempt to mark the object. |
|
4787
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
4785
diff
changeset
|
4536 if (do_mark_object && _g1->is_in_g1_reserved(obj)) { |
|
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
4785
diff
changeset
|
4537 mark_object(obj); |
|
3886
eeae91c9baba
7080389: G1: refactor marking code in evacuation pause copy closures
johnc
parents:
3869
diff
changeset
|
4538 } |
| 526 | 4539 } |
| 4540 | |
| 4541 if (barrier == G1BarrierEvac && obj != NULL) { | |
|
4836
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4834
diff
changeset
|
4542 _par_scan_state->update_rs(_from, p, _worker_id); |
| 526 | 4543 } |
| 4544 | |
| 4545 if (do_gen_barrier && obj != NULL) { | |
| 4546 par_do_barrier(p); | |
| 4547 } | |
| 4548 } | |
| 4549 | |
|
1261
0414c1049f15
6923991: G1: improve scalability of RSet scanning
iveresov
parents:
1245
diff
changeset
|
4550 template void G1ParCopyClosure<false, G1BarrierEvac, false>::do_oop_work(oop* p); |
|
0414c1049f15
6923991: G1: improve scalability of RSet scanning
iveresov
parents:
1245
diff
changeset
|
4551 template void G1ParCopyClosure<false, G1BarrierEvac, false>::do_oop_work(narrowOop* p); |
|
845
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
ysr
parents:
838
diff
changeset
|
4552 |
|
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
ysr
parents:
838
diff
changeset
|
4553 template <class T> void G1ParScanPartialArrayClosure::do_oop_nv(T* p) { |
| 526 | 4554 assert(has_partial_array_mask(p), "invariant"); |
|
4784
02838862dec8
7121623: G1: always be able to reliably calculate the length of a forwarded chunked array
tonyp
parents:
4783
diff
changeset
|
4555 oop from_obj = clear_partial_array_mask(p); |
|
02838862dec8
7121623: G1: always be able to reliably calculate the length of a forwarded chunked array
tonyp
parents:
4783
diff
changeset
|
4556 |
|
02838862dec8
7121623: G1: always be able to reliably calculate the length of a forwarded chunked array
tonyp
parents:
4783
diff
changeset
|
4557 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
tonyp
parents:
4783
diff
changeset
|
4558 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
tonyp
parents:
4783
diff
changeset
|
4559 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:
4783
diff
changeset
|
4560 // The from-space object contains the real length. |
|
02838862dec8
7121623: G1: always be able to reliably calculate the length of a forwarded chunked array
tonyp
parents:
4783
diff
changeset
|
4561 int length = from_obj_array->length(); |
|
02838862dec8
7121623: G1: always be able to reliably calculate the length of a forwarded chunked array
tonyp
parents:
4783
diff
changeset
|
4562 |
|
02838862dec8
7121623: G1: always be able to reliably calculate the length of a forwarded chunked array
tonyp
parents:
4783
diff
changeset
|
4563 assert(from_obj->is_forwarded(), "must be forwarded"); |
|
02838862dec8
7121623: G1: always be able to reliably calculate the length of a forwarded chunked array
tonyp
parents:
4783
diff
changeset
|
4564 oop to_obj = from_obj->forwardee(); |
|
02838862dec8
7121623: G1: always be able to reliably calculate the length of a forwarded chunked array
tonyp
parents:
4783
diff
changeset
|
4565 assert(from_obj != to_obj, "should not be chunking self-forwarded objects"); |
|
02838862dec8
7121623: G1: always be able to reliably calculate the length of a forwarded chunked array
tonyp
parents:
4783
diff
changeset
|
4566 objArrayOop to_obj_array = objArrayOop(to_obj); |
|
02838862dec8
7121623: G1: always be able to reliably calculate the length of a forwarded chunked array
tonyp
parents:
4783
diff
changeset
|
4567 // 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
tonyp
parents:
4783
diff
changeset
|
4568 // to-space object. |
|
02838862dec8
7121623: G1: always be able to reliably calculate the length of a forwarded chunked array
tonyp
parents:
4783
diff
changeset
|
4569 int next_index = to_obj_array->length(); |
|
02838862dec8
7121623: G1: always be able to reliably calculate the length of a forwarded chunked array
tonyp
parents:
4783
diff
changeset
|
4570 assert(0 <= next_index && next_index < length, |
|
02838862dec8
7121623: G1: always be able to reliably calculate the length of a forwarded chunked array
tonyp
parents:
4783
diff
changeset
|
4571 err_msg("invariant, next index: %d, length: %d", next_index, length)); |
|
02838862dec8
7121623: G1: always be able to reliably calculate the length of a forwarded chunked array
tonyp
parents:
4783
diff
changeset
|
4572 |
|
02838862dec8
7121623: G1: always be able to reliably calculate the length of a forwarded chunked array
tonyp
parents:
4783
diff
changeset
|
4573 int start = next_index; |
|
02838862dec8
7121623: G1: always be able to reliably calculate the length of a forwarded chunked array
tonyp
parents:
4783
diff
changeset
|
4574 int end = length; |
|
02838862dec8
7121623: G1: always be able to reliably calculate the length of a forwarded chunked array
tonyp
parents:
4783
diff
changeset
|
4575 int remainder = end - start; |
|
02838862dec8
7121623: G1: always be able to reliably calculate the length of a forwarded chunked array
tonyp
parents:
4783
diff
changeset
|
4576 // We'll try not to push a range that's smaller than ParGCArrayScanChunk. |
| 342 | 4577 if (remainder > 2 * ParGCArrayScanChunk) { |
| 4578 end = start + ParGCArrayScanChunk; | |
|
4784
02838862dec8
7121623: G1: always be able to reliably calculate the length of a forwarded chunked array
tonyp
parents:
4783
diff
changeset
|
4579 to_obj_array->set_length(end); |
|
02838862dec8
7121623: G1: always be able to reliably calculate the length of a forwarded chunked array
tonyp
parents:
4783
diff
changeset
|
4580 // Push the remainder before we process the range in case another |
|
02838862dec8
7121623: G1: always be able to reliably calculate the length of a forwarded chunked array
tonyp
parents:
4783
diff
changeset
|
4581 // worker has run out of things to do and can steal it. |
|
02838862dec8
7121623: G1: always be able to reliably calculate the length of a forwarded chunked array
tonyp
parents:
4783
diff
changeset
|
4582 oop* from_obj_p = set_partial_array_mask(from_obj); |
|
02838862dec8
7121623: G1: always be able to reliably calculate the length of a forwarded chunked array
tonyp
parents:
4783
diff
changeset
|
4583 _par_scan_state->push_on_queue(from_obj_p); |
| 342 | 4584 } else { |
|
4784
02838862dec8
7121623: G1: always be able to reliably calculate the length of a forwarded chunked array
tonyp
parents:
4783
diff
changeset
|
4585 assert(length == end, "sanity"); |
|
02838862dec8
7121623: G1: always be able to reliably calculate the length of a forwarded chunked array
tonyp
parents:
4783
diff
changeset
|
4586 // We'll process the final range for this object. Restore the length |
|
02838862dec8
7121623: G1: always be able to reliably calculate the length of a forwarded chunked array
tonyp
parents:
4783
diff
changeset
|
4587 // 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
tonyp
parents:
4783
diff
changeset
|
4588 to_obj_array->set_length(end); |
|
02838862dec8
7121623: G1: always be able to reliably calculate the length of a forwarded chunked array
tonyp
parents:
4783
diff
changeset
|
4589 } |
|
02838862dec8
7121623: G1: always be able to reliably calculate the length of a forwarded chunked array
tonyp
parents:
4783
diff
changeset
|
4590 _scanner.set_region(_g1->heap_region_containing_raw(to_obj)); |
|
02838862dec8
7121623: G1: always be able to reliably calculate the length of a forwarded chunked array
tonyp
parents:
4783
diff
changeset
|
4591 // 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
tonyp
parents:
4783
diff
changeset
|
4592 // 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
tonyp
parents:
4783
diff
changeset
|
4593 // 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
tonyp
parents:
4783
diff
changeset
|
4594 // 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
tonyp
parents:
4783
diff
changeset
|
4595 // 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
|
4596 // 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
tonyp
parents:
4783
diff
changeset
|
4597 // 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
tonyp
parents:
4783
diff
changeset
|
4598 // 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
tonyp
parents:
4783
diff
changeset
|
4599 to_obj_array->oop_iterate_range(&_scanner, start, end); |
| 342 | 4600 } |
| 4601 | |
| 4602 class G1ParEvacuateFollowersClosure : public VoidClosure { | |
| 4603 protected: | |
| 4604 G1CollectedHeap* _g1h; | |
| 4605 G1ParScanThreadState* _par_scan_state; | |
| 4606 RefToScanQueueSet* _queues; | |
| 4607 ParallelTaskTerminator* _terminator; | |
| 4608 | |
| 4609 G1ParScanThreadState* par_scan_state() { return _par_scan_state; } | |
| 4610 RefToScanQueueSet* queues() { return _queues; } | |
| 4611 ParallelTaskTerminator* terminator() { return _terminator; } | |
| 4612 | |
| 4613 public: | |
| 4614 G1ParEvacuateFollowersClosure(G1CollectedHeap* g1h, | |
| 4615 G1ParScanThreadState* par_scan_state, | |
| 4616 RefToScanQueueSet* queues, | |
| 4617 ParallelTaskTerminator* terminator) | |
| 4618 : _g1h(g1h), _par_scan_state(par_scan_state), | |
| 4619 _queues(queues), _terminator(terminator) {} | |
| 4620 | |
|
1862
b14ec34b1e07
6989448: G1: refactor and simplify G1ParScanThreadState
jcoomes
parents:
1861
diff
changeset
|
4621 void do_void(); |
|
b14ec34b1e07
6989448: G1: refactor and simplify G1ParScanThreadState
jcoomes
parents:
1861
diff
changeset
|
4622 |
|
b14ec34b1e07
6989448: G1: refactor and simplify G1ParScanThreadState
jcoomes
parents:
1861
diff
changeset
|
4623 private: |
|
b14ec34b1e07
6989448: G1: refactor and simplify G1ParScanThreadState
jcoomes
parents:
1861
diff
changeset
|
4624 inline bool offer_termination(); |
|
b14ec34b1e07
6989448: G1: refactor and simplify G1ParScanThreadState
jcoomes
parents:
1861
diff
changeset
|
4625 }; |
|
b14ec34b1e07
6989448: G1: refactor and simplify G1ParScanThreadState
jcoomes
parents:
1861
diff
changeset
|
4626 |
|
b14ec34b1e07
6989448: G1: refactor and simplify G1ParScanThreadState
jcoomes
parents:
1861
diff
changeset
|
4627 bool G1ParEvacuateFollowersClosure::offer_termination() { |
|
b14ec34b1e07
6989448: G1: refactor and simplify G1ParScanThreadState
jcoomes
parents:
1861
diff
changeset
|
4628 G1ParScanThreadState* const pss = par_scan_state(); |
|
b14ec34b1e07
6989448: G1: refactor and simplify G1ParScanThreadState
jcoomes
parents:
1861
diff
changeset
|
4629 pss->start_term_time(); |
|
b14ec34b1e07
6989448: G1: refactor and simplify G1ParScanThreadState
jcoomes
parents:
1861
diff
changeset
|
4630 const bool res = terminator()->offer_termination(); |
|
b14ec34b1e07
6989448: G1: refactor and simplify G1ParScanThreadState
jcoomes
parents:
1861
diff
changeset
|
4631 pss->end_term_time(); |
|
b14ec34b1e07
6989448: G1: refactor and simplify G1ParScanThreadState
jcoomes
parents:
1861
diff
changeset
|
4632 return res; |
|
b14ec34b1e07
6989448: G1: refactor and simplify G1ParScanThreadState
jcoomes
parents:
1861
diff
changeset
|
4633 } |
|
b14ec34b1e07
6989448: G1: refactor and simplify G1ParScanThreadState
jcoomes
parents:
1861
diff
changeset
|
4634 |
|
b14ec34b1e07
6989448: G1: refactor and simplify G1ParScanThreadState
jcoomes
parents:
1861
diff
changeset
|
4635 void G1ParEvacuateFollowersClosure::do_void() { |
|
b14ec34b1e07
6989448: G1: refactor and simplify G1ParScanThreadState
jcoomes
parents:
1861
diff
changeset
|
4636 StarTask stolen_task; |
|
b14ec34b1e07
6989448: G1: refactor and simplify G1ParScanThreadState
jcoomes
parents:
1861
diff
changeset
|
4637 G1ParScanThreadState* const pss = par_scan_state(); |
|
b14ec34b1e07
6989448: G1: refactor and simplify G1ParScanThreadState
jcoomes
parents:
1861
diff
changeset
|
4638 pss->trim_queue(); |
|
b14ec34b1e07
6989448: G1: refactor and simplify G1ParScanThreadState
jcoomes
parents:
1861
diff
changeset
|
4639 |
|
b14ec34b1e07
6989448: G1: refactor and simplify G1ParScanThreadState
jcoomes
parents:
1861
diff
changeset
|
4640 do { |
|
b14ec34b1e07
6989448: G1: refactor and simplify G1ParScanThreadState
jcoomes
parents:
1861
diff
changeset
|
4641 while (queues()->steal(pss->queue_num(), pss->hash_seed(), stolen_task)) { |
|
b14ec34b1e07
6989448: G1: refactor and simplify G1ParScanThreadState
jcoomes
parents:
1861
diff
changeset
|
4642 assert(pss->verify_task(stolen_task), "sanity"); |
|
b14ec34b1e07
6989448: G1: refactor and simplify G1ParScanThreadState
jcoomes
parents:
1861
diff
changeset
|
4643 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
|
4644 pss->deal_with_reference((narrowOop*) stolen_task); |
|
1862
b14ec34b1e07
6989448: G1: refactor and simplify G1ParScanThreadState
jcoomes
parents:
1861
diff
changeset
|
4645 } else { |
|
1883
35e4e086d5f5
6990359: G1: don't push a stolen entry on the taskqueue, deal with it directly
tonyp
parents:
1862
diff
changeset
|
4646 pss->deal_with_reference((oop*) stolen_task); |
|
1862
b14ec34b1e07
6989448: G1: refactor and simplify G1ParScanThreadState
jcoomes
parents:
1861
diff
changeset
|
4647 } |
|
1883
35e4e086d5f5
6990359: G1: don't push a stolen entry on the taskqueue, deal with it directly
tonyp
parents:
1862
diff
changeset
|
4648 |
|
35e4e086d5f5
6990359: G1: don't push a stolen entry on the taskqueue, deal with it directly
tonyp
parents:
1862
diff
changeset
|
4649 // 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
|
4650 // 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
parents:
1862
diff
changeset
|
4651 // we drain the queues as necessary. |
| 342 | 4652 pss->trim_queue(); |
| 4653 } | |
|
1862
b14ec34b1e07
6989448: G1: refactor and simplify G1ParScanThreadState
jcoomes
parents:
1861
diff
changeset
|
4654 } while (!offer_termination()); |
|
b14ec34b1e07
6989448: G1: refactor and simplify G1ParScanThreadState
jcoomes
parents:
1861
diff
changeset
|
4655 |
|
b14ec34b1e07
6989448: G1: refactor and simplify G1ParScanThreadState
jcoomes
parents:
1861
diff
changeset
|
4656 pss->retire_alloc_buffers(); |
|
b14ec34b1e07
6989448: G1: refactor and simplify G1ParScanThreadState
jcoomes
parents:
1861
diff
changeset
|
4657 } |
| 342 | 4658 |
| 4659 class G1ParTask : public AbstractGangTask { | |
| 4660 protected: | |
| 4661 G1CollectedHeap* _g1h; | |
| 4662 RefToScanQueueSet *_queues; | |
| 4663 ParallelTaskTerminator _terminator; | |
|
4728
441e946dc1af
7121618: Change type of number of GC workers to unsigned int.
jmasa
parents:
4711
diff
changeset
|
4664 uint _n_workers; |
| 342 | 4665 |
| 4666 Mutex _stats_lock; | |
| 4667 Mutex* stats_lock() { return &_stats_lock; } | |
| 4668 | |
| 4669 size_t getNCards() { | |
| 4670 return (_g1h->capacity() + G1BlockOffsetSharedArray::N_bytes - 1) | |
| 4671 / G1BlockOffsetSharedArray::N_bytes; | |
| 4672 } | |
| 4673 | |
| 4674 public: | |
|
4095
bca17e38de00
6593758: RFE: Enhance GC ergonomics to dynamically choose ParallelGCThreads
jmasa
parents:
4090
diff
changeset
|
4675 G1ParTask(G1CollectedHeap* g1h, |
|
bca17e38de00
6593758: RFE: Enhance GC ergonomics to dynamically choose ParallelGCThreads
jmasa
parents:
4090
diff
changeset
|
4676 RefToScanQueueSet *task_queues) |
| 342 | 4677 : AbstractGangTask("G1 collection"), |
| 4678 _g1h(g1h), | |
| 4679 _queues(task_queues), | |
|
4095
bca17e38de00
6593758: RFE: Enhance GC ergonomics to dynamically choose ParallelGCThreads
jmasa
parents:
4090
diff
changeset
|
4680 _terminator(0, _queues), |
|
bca17e38de00
6593758: RFE: Enhance GC ergonomics to dynamically choose ParallelGCThreads
jmasa
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|
4681 _stats_lock(Mutex::leaf, "parallel G1 stats lock", true) |
| 342 | 4682 {} |
| 4683 | |
| 4684 RefToScanQueueSet* queues() { return _queues; } | |
| 4685 | |
| 4686 RefToScanQueue *work_queue(int i) { | |
| 4687 return queues()->queue(i); | |
| 4688 } | |
| 4689 | |
|
4095
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|
4690 ParallelTaskTerminator* terminator() { return &_terminator; } |
|
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|
4691 |
|
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|
4692 virtual void set_for_termination(int active_workers) { |
|
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|
4693 // This task calls set_n_termination() in par_non_clean_card_iterate_work() |
|
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4694 // in the young space (_par_seq_tasks) in the G1 heap |
|
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|
4695 // for SequentialSubTasksDone. |
|
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4696 // This task also uses SubTasksDone in SharedHeap and G1CollectedHeap |
|
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|
4697 // both of which need setting by set_n_termination(). |
|
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4698 _g1h->SharedHeap::set_n_termination(active_workers); |
|
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|
4699 _g1h->set_n_termination(active_workers); |
|
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|
4700 terminator()->reset_for_reuse(active_workers); |
|
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|
4701 _n_workers = active_workers; |
|
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|
4702 } |
|
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|
4703 |
|
4728
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|
4704 void work(uint worker_id) { |
|
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|
4705 if (worker_id >= _n_workers) return; // no work needed this round |
| 1611 | 4706 |
| 4707 double start_time_ms = os::elapsedTime() * 1000.0; | |
|
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4708 _g1h->g1_policy()->phase_times()->record_gc_worker_start_time(worker_id, start_time_ms); |
| 1611 | 4709 |
|
5986
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|
4710 { |
|
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|
4711 ResourceMark rm; |
|
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|
4712 HandleMark hm; |
|
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|
4713 |
|
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|
4714 ReferenceProcessor* rp = _g1h->ref_processor_stw(); |
|
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|
4715 |
|
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|
4716 G1ParScanThreadState pss(_g1h, worker_id); |
|
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|
4717 G1ParScanHeapEvacClosure scan_evac_cl(_g1h, &pss, rp); |
|
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|
4718 G1ParScanHeapEvacFailureClosure evac_failure_cl(_g1h, &pss, rp); |
|
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|
4719 G1ParScanPartialArrayClosure partial_scan_cl(_g1h, &pss, rp); |
|
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|
4720 |
|
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|
4721 pss.set_evac_closure(&scan_evac_cl); |
|
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|
4722 pss.set_evac_failure_closure(&evac_failure_cl); |
|
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|
4723 pss.set_partial_scan_closure(&partial_scan_cl); |
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|
4724 |
|
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|
4725 G1ParScanExtRootClosure only_scan_root_cl(_g1h, &pss, rp); |
|
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|
4726 G1ParScanPermClosure only_scan_perm_cl(_g1h, &pss, rp); |
|
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|
4727 |
|
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|
4728 G1ParScanAndMarkExtRootClosure scan_mark_root_cl(_g1h, &pss, rp); |
|
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|
4729 G1ParScanAndMarkPermClosure scan_mark_perm_cl(_g1h, &pss, rp); |
|
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|
4730 |
|
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|
4731 OopClosure* scan_root_cl = &only_scan_root_cl; |
|
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|
4732 OopsInHeapRegionClosure* scan_perm_cl = &only_scan_perm_cl; |
|
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|
4733 |
|
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|
4734 if (_g1h->g1_policy()->during_initial_mark_pause()) { |
|
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|
4735 // We also need to mark copied objects. |
|
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|
4736 scan_root_cl = &scan_mark_root_cl; |
|
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|
4737 scan_perm_cl = &scan_mark_perm_cl; |
|
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|
4738 } |
|
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|
4739 |
|
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changeset
|
4740 G1ParPushHeapRSClosure push_heap_rs_cl(_g1h, &pss); |
|
500023bd0818
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|
4741 |
|
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|
4742 pss.start_strong_roots(); |
|
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changeset
|
4743 _g1h->g1_process_strong_roots(/* not collecting perm */ false, |
|
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|
4744 SharedHeap::SO_AllClasses, |
|
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|
4745 scan_root_cl, |
|
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changeset
|
4746 &push_heap_rs_cl, |
|
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changeset
|
4747 scan_perm_cl, |
|
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|
4748 worker_id); |
|
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changeset
|
4749 pss.end_strong_roots(); |
|
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|
4750 |
|
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|
4751 { |
|
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|
4752 double start = os::elapsedTime(); |
|
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|
4753 G1ParEvacuateFollowersClosure evac(_g1h, &pss, _queues, &_terminator); |
|
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|
4754 evac.do_void(); |
|
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changeset
|
4755 double elapsed_ms = (os::elapsedTime()-start)*1000.0; |
|
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changeset
|
4756 double term_ms = pss.term_time()*1000.0; |
|
6219
922993931b3d
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|
4757 _g1h->g1_policy()->phase_times()->record_obj_copy_time(worker_id, elapsed_ms-term_ms); |
|
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|
4758 _g1h->g1_policy()->phase_times()->record_termination(worker_id, term_ms, pss.term_attempts()); |
|
5986
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|
4759 } |
|
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diff
changeset
|
4760 _g1h->g1_policy()->record_thread_age_table(pss.age_table()); |
|
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changeset
|
4761 _g1h->update_surviving_young_words(pss.surviving_young_words()+1); |
|
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|
4762 |
|
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diff
changeset
|
4763 if (ParallelGCVerbose) { |
|
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changeset
|
4764 MutexLocker x(stats_lock()); |
|
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changeset
|
4765 pss.print_termination_stats(worker_id); |
|
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|
4766 } |
|
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|
4767 |
|
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|
4768 assert(pss.refs()->is_empty(), "should be empty"); |
|
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|
4769 |
|
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changeset
|
4770 // Close the inner scope so that the ResourceMark and HandleMark |
|
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|
4771 // destructors are executed here and are included as part of the |
|
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|
4772 // "GC Worker Time". |
| 342 | 4773 } |
| 4774 | |
| 1611 | 4775 double end_time_ms = os::elapsedTime() * 1000.0; |
|
6219
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|
4776 _g1h->g1_policy()->phase_times()->record_gc_worker_end_time(worker_id, end_time_ms); |
| 342 | 4777 } |
| 4778 }; | |
| 4779 | |
| 4780 // *** Common G1 Evacuation Stuff | |
| 4781 | |
|
5986
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|
4782 // Closures that support the filtering of CodeBlobs scanned during |
|
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|
4783 // external root scanning. |
|
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changeset
|
4784 |
|
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|
4785 // Closure applied to reference fields in code blobs (specifically nmethods) |
|
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|
4786 // to determine whether an nmethod contains references that point into |
|
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|
4787 // the collection set. Used as a predicate when walking code roots so |
|
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|
4788 // that only nmethods that point into the collection set are added to the |
|
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|
4789 // 'marked' list. |
|
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|
4790 |
|
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|
4791 class G1FilteredCodeBlobToOopClosure : public CodeBlobToOopClosure { |
|
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|
4792 |
|
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|
4793 class G1PointsIntoCSOopClosure : public OopClosure { |
|
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|
4794 G1CollectedHeap* _g1; |
|
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|
4795 bool _points_into_cs; |
|
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|
4796 public: |
|
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|
4797 G1PointsIntoCSOopClosure(G1CollectedHeap* g1) : |
|
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|
4798 _g1(g1), _points_into_cs(false) { } |
|
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|
4799 |
|
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|
4800 bool points_into_cs() const { return _points_into_cs; } |
|
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|
4801 |
|
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|
4802 template <class T> |
|
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|
4803 void do_oop_nv(T* p) { |
|
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|
4804 if (!_points_into_cs) { |
|
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|
4805 T heap_oop = oopDesc::load_heap_oop(p); |
|
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|
4806 if (!oopDesc::is_null(heap_oop) && |
|
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|
4807 _g1->in_cset_fast_test(oopDesc::decode_heap_oop_not_null(heap_oop))) { |
|
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|
4808 _points_into_cs = true; |
|
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5963
diff
changeset
|
4809 } |
|
500023bd0818
7143511: G1: Another instance of high GC Worker Other time (50ms)
johnc
parents:
5963
diff
changeset
|
4810 } |
|
500023bd0818
7143511: G1: Another instance of high GC Worker Other time (50ms)
johnc
parents:
5963
diff
changeset
|
4811 } |
|
500023bd0818
7143511: G1: Another instance of high GC Worker Other time (50ms)
johnc
parents:
5963
diff
changeset
|
4812 |
|
500023bd0818
7143511: G1: Another instance of high GC Worker Other time (50ms)
johnc
parents:
5963
diff
changeset
|
4813 virtual void do_oop(oop* p) { do_oop_nv(p); } |
|
500023bd0818
7143511: G1: Another instance of high GC Worker Other time (50ms)
johnc
parents:
5963
diff
changeset
|
4814 virtual void do_oop(narrowOop* p) { do_oop_nv(p); } |
|
500023bd0818
7143511: G1: Another instance of high GC Worker Other time (50ms)
johnc
parents:
5963
diff
changeset
|
4815 }; |
|
500023bd0818
7143511: G1: Another instance of high GC Worker Other time (50ms)
johnc
parents:
5963
diff
changeset
|
4816 |
|
500023bd0818
7143511: G1: Another instance of high GC Worker Other time (50ms)
johnc
parents:
5963
diff
changeset
|
4817 G1CollectedHeap* _g1; |
|
500023bd0818
7143511: G1: Another instance of high GC Worker Other time (50ms)
johnc
parents:
5963
diff
changeset
|
4818 |
|
500023bd0818
7143511: G1: Another instance of high GC Worker Other time (50ms)
johnc
parents:
5963
diff
changeset
|
4819 public: |
|
500023bd0818
7143511: G1: Another instance of high GC Worker Other time (50ms)
johnc
parents:
5963
diff
changeset
|
4820 G1FilteredCodeBlobToOopClosure(G1CollectedHeap* g1, OopClosure* cl) : |
|
500023bd0818
7143511: G1: Another instance of high GC Worker Other time (50ms)
johnc
parents:
5963
diff
changeset
|
4821 CodeBlobToOopClosure(cl, true), _g1(g1) { } |
|
500023bd0818
7143511: G1: Another instance of high GC Worker Other time (50ms)
johnc
parents:
5963
diff
changeset
|
4822 |
|
500023bd0818
7143511: G1: Another instance of high GC Worker Other time (50ms)
johnc
parents:
5963
diff
changeset
|
4823 virtual void do_code_blob(CodeBlob* cb) { |
|
500023bd0818
7143511: G1: Another instance of high GC Worker Other time (50ms)
johnc
parents:
5963
diff
changeset
|
4824 nmethod* nm = cb->as_nmethod_or_null(); |
|
500023bd0818
7143511: G1: Another instance of high GC Worker Other time (50ms)
johnc
parents:
5963
diff
changeset
|
4825 if (nm != NULL && !(nm->test_oops_do_mark())) { |
|
500023bd0818
7143511: G1: Another instance of high GC Worker Other time (50ms)
johnc
parents:
5963
diff
changeset
|
4826 G1PointsIntoCSOopClosure predicate_cl(_g1); |
|
500023bd0818
7143511: G1: Another instance of high GC Worker Other time (50ms)
johnc
parents:
5963
diff
changeset
|
4827 nm->oops_do(&predicate_cl); |
|
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 if (predicate_cl.points_into_cs()) { |
|
500023bd0818
7143511: G1: Another instance of high GC Worker Other time (50ms)
johnc
parents:
5963
diff
changeset
|
4830 // 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
|
4831 // 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
|
4832 // 'mark' this nmethod. |
|
500023bd0818
7143511: G1: Another instance of high GC Worker Other time (50ms)
johnc
parents:
5963
diff
changeset
|
4833 // 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
|
4834 // or MarkingCodeBlobClosure::do_code_blob() change. |
|
500023bd0818
7143511: G1: Another instance of high GC Worker Other time (50ms)
johnc
parents:
5963
diff
changeset
|
4835 if (!nm->test_set_oops_do_mark()) { |
|
500023bd0818
7143511: G1: Another instance of high GC Worker Other time (50ms)
johnc
parents:
5963
diff
changeset
|
4836 do_newly_marked_nmethod(nm); |
|
500023bd0818
7143511: G1: Another instance of high GC Worker Other time (50ms)
johnc
parents:
5963
diff
changeset
|
4837 } |
|
500023bd0818
7143511: G1: Another instance of high GC Worker Other time (50ms)
johnc
parents:
5963
diff
changeset
|
4838 } |
|
500023bd0818
7143511: G1: Another instance of high GC Worker Other time (50ms)
johnc
parents:
5963
diff
changeset
|
4839 } |
|
500023bd0818
7143511: G1: Another instance of high GC Worker Other time (50ms)
johnc
parents:
5963
diff
changeset
|
4840 } |
|
500023bd0818
7143511: G1: Another instance of high GC Worker Other time (50ms)
johnc
parents:
5963
diff
changeset
|
4841 }; |
|
500023bd0818
7143511: G1: Another instance of high GC Worker Other time (50ms)
johnc
parents:
5963
diff
changeset
|
4842 |
|
1833
8b10f48633dc
6984287: Regularize how GC parallel workers are specified.
jmasa
parents:
1755
diff
changeset
|
4843 // This method is run in a GC worker. |
|
8b10f48633dc
6984287: Regularize how GC parallel workers are specified.
jmasa
parents:
1755
diff
changeset
|
4844 |
| 342 | 4845 void |
| 4846 G1CollectedHeap:: | |
| 4847 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
|
4848 ScanningOption so, |
| 342 | 4849 OopClosure* scan_non_heap_roots, |
| 4850 OopsInHeapRegionClosure* scan_rs, | |
| 4851 OopsInGenClosure* scan_perm, | |
| 4852 int worker_i) { | |
|
3979
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
4853 |
| 342 | 4854 // First scan the strong roots, including the perm gen. |
| 4855 double ext_roots_start = os::elapsedTime(); | |
| 4856 double closure_app_time_sec = 0.0; | |
| 4857 | |
| 4858 BufferingOopClosure buf_scan_non_heap_roots(scan_non_heap_roots); | |
| 4859 BufferingOopsInGenClosure buf_scan_perm(scan_perm); | |
| 4860 buf_scan_perm.set_generation(perm_gen()); | |
| 4861 | |
|
989
148e5441d916
6863023: need non-perm oops in code cache for JSR 292
jrose
parents:
890
diff
changeset
|
4862 // 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
|
4863 // unaligned oop locations. |
|
5986
500023bd0818
7143511: G1: Another instance of high GC Worker Other time (50ms)
johnc
parents:
5963
diff
changeset
|
4864 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
|
4865 |
|
148e5441d916
6863023: need non-perm oops in code cache for JSR 292
jrose
parents:
890
diff
changeset
|
4866 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
|
4867 collecting_perm_gen, so, |
| 342 | 4868 &buf_scan_non_heap_roots, |
|
989
148e5441d916
6863023: need non-perm oops in code cache for JSR 292
jrose
parents:
890
diff
changeset
|
4869 &eager_scan_code_roots, |
| 342 | 4870 &buf_scan_perm); |
|
1394
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
4871 |
|
3979
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
4872 // 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
|
4873 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
|
4874 // We need to treat the discovered reference lists of the |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
4875 // concurrent mark ref processor as roots and keep entries |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
4876 // (which are added by the marking threads) on them live |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
4877 // until they can be processed at the end of marking. |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
4878 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
|
4879 } |
|
14a2fd14c0db
7068240: G1: Long "parallel other time" and "ext root scanning" when running specific benchmark
johnc
parents:
3778
diff
changeset
|
4880 |
|
14a2fd14c0db
7068240: G1: Long "parallel other time" and "ext root scanning" when running specific benchmark
johnc
parents:
3778
diff
changeset
|
4881 // Finish up any enqueued closure apps (attributed as object copy time). |
| 342 | 4882 buf_scan_non_heap_roots.done(); |
| 4883 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
|
4884 |
| 342 | 4885 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
|
4886 |
|
6219
922993931b3d
7178361: G1: Make sure that PrintGC and PrintGCDetails use the same timing for the GC pause
brutisso
parents:
6188
diff
changeset
|
4887 g1_policy()->phase_times()->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
|
4888 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
|
4889 buf_scan_non_heap_roots.closure_app_seconds(); |
|
6219
922993931b3d
7178361: G1: Make sure that PrintGC and PrintGCDetails use the same timing for the GC pause
brutisso
parents:
6188
diff
changeset
|
4890 g1_policy()->phase_times()->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
|
4891 |
| 342 | 4892 double ext_root_time_ms = |
| 4893 ((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
|
4894 |
|
6219
922993931b3d
7178361: G1: Make sure that PrintGC and PrintGCDetails use the same timing for the GC pause
brutisso
parents:
6188
diff
changeset
|
4895 g1_policy()->phase_times()->record_ext_root_scan_time(worker_i, ext_root_time_ms); |
| 342 | 4896 |
|
4787
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
4785
diff
changeset
|
4897 // 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
|
4898 // 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
|
4899 // as implicitly live). |
|
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
4785
diff
changeset
|
4900 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
|
4901 if (mark_in_progress()) { |
|
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
4785
diff
changeset
|
4902 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
|
4903 } |
|
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
4785
diff
changeset
|
4904 } |
|
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
4785
diff
changeset
|
4905 double satb_filtering_ms = (os::elapsedTime() - ext_roots_end) * 1000.0; |
|
6219
922993931b3d
7178361: G1: Make sure that PrintGC and PrintGCDetails use the same timing for the GC pause
brutisso
parents:
6188
diff
changeset
|
4906 g1_policy()->phase_times()->record_satb_filtering_time(worker_i, satb_filtering_ms); |
| 342 | 4907 |
| 4908 // Now scan the complement of the collection set. | |
| 4909 if (scan_rs != NULL) { | |
| 4910 g1_rem_set()->oops_into_collection_set_do(scan_rs, worker_i); | |
| 4911 } | |
|
3823
14a2fd14c0db
7068240: G1: Long "parallel other time" and "ext root scanning" when running specific benchmark
johnc
parents:
3778
diff
changeset
|
4912 |
| 342 | 4913 _process_strong_tasks->all_tasks_completed(); |
| 4914 } | |
| 4915 | |
| 4916 void | |
| 4917 G1CollectedHeap::g1_process_weak_roots(OopClosure* root_closure, | |
| 4918 OopClosure* non_root_closure) { | |
|
989
148e5441d916
6863023: need non-perm oops in code cache for JSR 292
jrose
parents:
890
diff
changeset
|
4919 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
|
4920 SharedHeap::process_weak_roots(root_closure, &roots_in_blobs, non_root_closure); |
| 342 | 4921 } |
| 4922 | |
|
3979
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
4923 // Weak Reference Processing support |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
4924 |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
4925 // An always "is_alive" closure that is used to preserve referents. |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
4926 // 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
|
4927 // of referent objects that are pointed to by reference objects |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
4928 // discovered by the CM ref processor. |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
4929 class G1AlwaysAliveClosure: public BoolObjectClosure { |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
4930 G1CollectedHeap* _g1; |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
4931 public: |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
4932 G1AlwaysAliveClosure(G1CollectedHeap* g1) : _g1(g1) {} |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
4933 void do_object(oop p) { assert(false, "Do not call."); } |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
4934 bool do_object_b(oop p) { |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
4935 if (p != NULL) { |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
4936 return true; |
|
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 return false; |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
4939 } |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
4940 }; |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
4941 |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
4942 bool G1STWIsAliveClosure::do_object_b(oop p) { |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
4943 // An object is reachable if it is outside the collection set, |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
4944 // or is inside and copied. |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
4945 return !_g1->obj_in_cs(p) || p->is_forwarded(); |
|
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 |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
4948 // Non Copying Keep Alive closure |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
4949 class G1KeepAliveClosure: public OopClosure { |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
4950 G1CollectedHeap* _g1; |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
4951 public: |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
4952 G1KeepAliveClosure(G1CollectedHeap* g1) : _g1(g1) {} |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
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|
4953 void do_oop(narrowOop* p) { guarantee(false, "Not needed"); } |
|
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|
4954 void do_oop( oop* p) { |
|
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|
4955 oop obj = *p; |
|
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|
4956 |
|
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|
4957 if (_g1->obj_in_cs(obj)) { |
|
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|
4958 assert( obj->is_forwarded(), "invariant" ); |
|
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|
4959 *p = obj->forwardee(); |
|
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|
4960 } |
|
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|
4961 } |
|
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|
4962 }; |
|
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changeset
|
4963 |
|
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changeset
|
4964 // Copying Keep Alive closure - can be called from both |
|
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|
4965 // serial and parallel code as long as different worker |
|
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|
4966 // threads utilize different G1ParScanThreadState instances |
|
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changeset
|
4967 // and different queues. |
|
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changeset
|
4968 |
|
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changeset
|
4969 class G1CopyingKeepAliveClosure: public OopClosure { |
|
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|
4970 G1CollectedHeap* _g1h; |
|
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|
4971 OopClosure* _copy_non_heap_obj_cl; |
|
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|
4972 OopsInHeapRegionClosure* _copy_perm_obj_cl; |
|
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|
4973 G1ParScanThreadState* _par_scan_state; |
|
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|
4974 |
|
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|
4975 public: |
|
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changeset
|
4976 G1CopyingKeepAliveClosure(G1CollectedHeap* g1h, |
|
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|
4977 OopClosure* non_heap_obj_cl, |
|
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|
4978 OopsInHeapRegionClosure* perm_obj_cl, |
|
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|
4979 G1ParScanThreadState* pss): |
|
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changeset
|
4980 _g1h(g1h), |
|
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changeset
|
4981 _copy_non_heap_obj_cl(non_heap_obj_cl), |
|
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changeset
|
4982 _copy_perm_obj_cl(perm_obj_cl), |
|
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|
4983 _par_scan_state(pss) |
|
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|
4984 {} |
|
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changeset
|
4985 |
|
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|
4986 virtual void do_oop(narrowOop* p) { do_oop_work(p); } |
|
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changeset
|
4987 virtual void do_oop( oop* p) { do_oop_work(p); } |
|
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|
4988 |
|
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changeset
|
4989 template <class T> void do_oop_work(T* p) { |
|
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changeset
|
4990 oop obj = oopDesc::load_decode_heap_oop(p); |
|
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|
4991 |
|
4dfb2df418f2
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changeset
|
4992 if (_g1h->obj_in_cs(obj)) { |
|
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|
4993 // If the referent object has been forwarded (either copied |
|
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|
4994 // to a new location or to itself in the event of an |
|
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changeset
|
4995 // evacuation failure) then we need to update the reference |
|
4dfb2df418f2
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|
4996 // field and, if both reference and referent are in the G1 |
|
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changeset
|
4997 // heap, update the RSet for the referent. |
|
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|
4998 // |
|
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changeset
|
4999 // If the referent has not been forwarded then we have to keep |
|
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|
5000 // it alive by policy. Therefore we have copy the referent. |
|
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|
5001 // |
|
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changeset
|
5002 // If the reference field is in the G1 heap then we can push |
|
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changeset
|
5003 // on the PSS queue. When the queue is drained (after each |
|
4dfb2df418f2
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changeset
|
5004 // phase of reference processing) the object and it's followers |
|
4dfb2df418f2
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changeset
|
5005 // will be copied, the reference field set to point to the |
|
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changeset
|
5006 // new location, and the RSet updated. Otherwise we need to |
|
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changeset
|
5007 // use the the non-heap or perm closures directly to copy |
|
4dfb2df418f2
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changeset
|
5008 // the refernt object and update the pointer, while avoiding |
|
4dfb2df418f2
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diff
changeset
|
5009 // updating the RSet. |
|
4dfb2df418f2
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diff
changeset
|
5010 |
|
4dfb2df418f2
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diff
changeset
|
5011 if (_g1h->is_in_g1_reserved(p)) { |
|
4dfb2df418f2
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diff
changeset
|
5012 _par_scan_state->push_on_queue(p); |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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parents:
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diff
changeset
|
5013 } else { |
|
4dfb2df418f2
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diff
changeset
|
5014 // The reference field is not in the G1 heap. |
|
4dfb2df418f2
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parents:
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diff
changeset
|
5015 if (_g1h->perm_gen()->is_in(p)) { |
|
4dfb2df418f2
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parents:
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diff
changeset
|
5016 _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
|
5017 } else { |
|
4dfb2df418f2
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parents:
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diff
changeset
|
5018 _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
|
5019 } |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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parents:
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diff
changeset
|
5020 } |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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parents:
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diff
changeset
|
5021 } |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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parents:
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diff
changeset
|
5022 } |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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parents:
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diff
changeset
|
5023 }; |
|
4dfb2df418f2
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parents:
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diff
changeset
|
5024 |
|
4dfb2df418f2
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parents:
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diff
changeset
|
5025 // Serial drain queue closure. Called as the 'complete_gc' |
|
4dfb2df418f2
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parents:
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diff
changeset
|
5026 // closure for each discovered list in some of the |
|
4dfb2df418f2
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parents:
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diff
changeset
|
5027 // reference processing phases. |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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parents:
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diff
changeset
|
5028 |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
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diff
changeset
|
5029 class G1STWDrainQueueClosure: public VoidClosure { |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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parents:
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diff
changeset
|
5030 protected: |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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parents:
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diff
changeset
|
5031 G1CollectedHeap* _g1h; |
|
4dfb2df418f2
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diff
changeset
|
5032 G1ParScanThreadState* _par_scan_state; |
|
4dfb2df418f2
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parents:
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diff
changeset
|
5033 |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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parents:
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diff
changeset
|
5034 G1ParScanThreadState* par_scan_state() { return _par_scan_state; } |
|
4dfb2df418f2
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parents:
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diff
changeset
|
5035 |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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parents:
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diff
changeset
|
5036 public: |
|
4dfb2df418f2
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parents:
3973
diff
changeset
|
5037 G1STWDrainQueueClosure(G1CollectedHeap* g1h, G1ParScanThreadState* pss) : |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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parents:
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diff
changeset
|
5038 _g1h(g1h), |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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parents:
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diff
changeset
|
5039 _par_scan_state(pss) |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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parents:
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diff
changeset
|
5040 { } |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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parents:
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diff
changeset
|
5041 |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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parents:
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diff
changeset
|
5042 void do_void() { |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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parents:
3973
diff
changeset
|
5043 G1ParScanThreadState* const pss = par_scan_state(); |
|
4dfb2df418f2
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diff
changeset
|
5044 pss->trim_queue(); |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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parents:
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diff
changeset
|
5045 } |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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parents:
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diff
changeset
|
5046 }; |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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parents:
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diff
changeset
|
5047 |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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parents:
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diff
changeset
|
5048 // Parallel Reference Processing closures |
|
4dfb2df418f2
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parents:
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diff
changeset
|
5049 |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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diff
changeset
|
5050 // Implementation of AbstractRefProcTaskExecutor for parallel reference |
|
4dfb2df418f2
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diff
changeset
|
5051 // processing during G1 evacuation pauses. |
|
4dfb2df418f2
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diff
changeset
|
5052 |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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parents:
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diff
changeset
|
5053 class G1STWRefProcTaskExecutor: public AbstractRefProcTaskExecutor { |
|
4dfb2df418f2
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parents:
3973
diff
changeset
|
5054 private: |
|
4dfb2df418f2
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parents:
3973
diff
changeset
|
5055 G1CollectedHeap* _g1h; |
|
4dfb2df418f2
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diff
changeset
|
5056 RefToScanQueueSet* _queues; |
|
4095
bca17e38de00
6593758: RFE: Enhance GC ergonomics to dynamically choose ParallelGCThreads
jmasa
parents:
4090
diff
changeset
|
5057 FlexibleWorkGang* _workers; |
|
3979
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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parents:
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diff
changeset
|
5058 int _active_workers; |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5059 |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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parents:
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diff
changeset
|
5060 public: |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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parents:
3973
diff
changeset
|
5061 G1STWRefProcTaskExecutor(G1CollectedHeap* g1h, |
|
4095
bca17e38de00
6593758: RFE: Enhance GC ergonomics to dynamically choose ParallelGCThreads
jmasa
parents:
4090
diff
changeset
|
5062 FlexibleWorkGang* workers, |
|
3979
4dfb2df418f2
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parents:
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diff
changeset
|
5063 RefToScanQueueSet *task_queues, |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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parents:
3973
diff
changeset
|
5064 int n_workers) : |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5065 _g1h(g1h), |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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parents:
3973
diff
changeset
|
5066 _queues(task_queues), |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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parents:
3973
diff
changeset
|
5067 _workers(workers), |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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parents:
3973
diff
changeset
|
5068 _active_workers(n_workers) |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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parents:
3973
diff
changeset
|
5069 { |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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parents:
3973
diff
changeset
|
5070 assert(n_workers > 0, "shouldn't call this otherwise"); |
|
4dfb2df418f2
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parents:
3973
diff
changeset
|
5071 } |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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parents:
3973
diff
changeset
|
5072 |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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parents:
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diff
changeset
|
5073 // Executes the given task using concurrent marking worker threads. |
|
4dfb2df418f2
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parents:
3973
diff
changeset
|
5074 virtual void execute(ProcessTask& task); |
|
4dfb2df418f2
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parents:
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diff
changeset
|
5075 virtual void execute(EnqueueTask& task); |
|
4dfb2df418f2
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parents:
3973
diff
changeset
|
5076 }; |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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parents:
3973
diff
changeset
|
5077 |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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parents:
3973
diff
changeset
|
5078 // Gang task for possibly parallel reference processing |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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parents:
3973
diff
changeset
|
5079 |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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parents:
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diff
changeset
|
5080 class G1STWRefProcTaskProxy: public AbstractGangTask { |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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|
5081 typedef AbstractRefProcTaskExecutor::ProcessTask ProcessTask; |
|
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|
5082 ProcessTask& _proc_task; |
|
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|
5083 G1CollectedHeap* _g1h; |
|
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|
5084 RefToScanQueueSet *_task_queues; |
|
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|
5085 ParallelTaskTerminator* _terminator; |
|
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|
5086 |
|
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|
5087 public: |
|
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|
5088 G1STWRefProcTaskProxy(ProcessTask& proc_task, |
|
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|
5089 G1CollectedHeap* g1h, |
|
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|
5090 RefToScanQueueSet *task_queues, |
|
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|
5091 ParallelTaskTerminator* terminator) : |
|
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|
5092 AbstractGangTask("Process reference objects in parallel"), |
|
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|
5093 _proc_task(proc_task), |
|
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|
5094 _g1h(g1h), |
|
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|
5095 _task_queues(task_queues), |
|
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|
5096 _terminator(terminator) |
|
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|
5097 {} |
|
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|
5098 |
|
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5099 virtual void work(uint worker_id) { |
|
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5100 // The reference processing task executed by a single worker. |
|
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|
5101 ResourceMark rm; |
|
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|
5102 HandleMark hm; |
|
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|
5103 |
|
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|
5104 G1STWIsAliveClosure is_alive(_g1h); |
|
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|
5105 |
|
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|
5106 G1ParScanThreadState pss(_g1h, worker_id); |
|
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|
5107 |
|
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|
5108 G1ParScanHeapEvacClosure scan_evac_cl(_g1h, &pss, NULL); |
|
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|
5109 G1ParScanHeapEvacFailureClosure evac_failure_cl(_g1h, &pss, NULL); |
|
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|
5110 G1ParScanPartialArrayClosure partial_scan_cl(_g1h, &pss, NULL); |
|
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5111 |
|
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|
5112 pss.set_evac_closure(&scan_evac_cl); |
|
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|
5113 pss.set_evac_failure_closure(&evac_failure_cl); |
|
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|
5114 pss.set_partial_scan_closure(&partial_scan_cl); |
|
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|
5115 |
|
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|
5116 G1ParScanExtRootClosure only_copy_non_heap_cl(_g1h, &pss, NULL); |
|
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|
5117 G1ParScanPermClosure only_copy_perm_cl(_g1h, &pss, NULL); |
|
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|
5118 |
|
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|
5119 G1ParScanAndMarkExtRootClosure copy_mark_non_heap_cl(_g1h, &pss, NULL); |
|
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|
5120 G1ParScanAndMarkPermClosure copy_mark_perm_cl(_g1h, &pss, NULL); |
|
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|
5121 |
|
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|
5122 OopClosure* copy_non_heap_cl = &only_copy_non_heap_cl; |
|
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|
5123 OopsInHeapRegionClosure* copy_perm_cl = &only_copy_perm_cl; |
|
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|
5124 |
|
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|
5125 if (_g1h->g1_policy()->during_initial_mark_pause()) { |
|
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|
5126 // We also need to mark copied objects. |
|
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|
5127 copy_non_heap_cl = ©_mark_non_heap_cl; |
|
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|
5128 copy_perm_cl = ©_mark_perm_cl; |
|
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|
5129 } |
|
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|
5130 |
|
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|
5131 // Keep alive closure. |
|
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|
5132 G1CopyingKeepAliveClosure keep_alive(_g1h, copy_non_heap_cl, copy_perm_cl, &pss); |
|
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|
5133 |
|
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|
5134 // Complete GC closure |
|
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|
5135 G1ParEvacuateFollowersClosure drain_queue(_g1h, &pss, _task_queues, _terminator); |
|
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|
5136 |
|
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|
5137 // Call the reference processing task's work routine. |
|
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5138 _proc_task.work(worker_id, is_alive, keep_alive, drain_queue); |
|
3979
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|
5139 |
|
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|
5140 // Note we cannot assert that the refs array is empty here as not all |
|
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|
5141 // of the processing tasks (specifically phase2 - pp2_work) execute |
|
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|
5142 // the complete_gc closure (which ordinarily would drain the queue) so |
|
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|
5143 // the queue may not be empty. |
|
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|
5144 } |
|
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|
5145 }; |
|
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changeset
|
5146 |
|
4dfb2df418f2
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|
5147 // Driver routine for parallel reference processing. |
|
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|
5148 // Creates an instance of the ref processing gang |
|
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|
5149 // task and has the worker threads execute it. |
|
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|
5150 void G1STWRefProcTaskExecutor::execute(ProcessTask& proc_task) { |
|
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|
5151 assert(_workers != NULL, "Need parallel worker threads."); |
|
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|
5152 |
|
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changeset
|
5153 ParallelTaskTerminator terminator(_active_workers, _queues); |
|
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|
5154 G1STWRefProcTaskProxy proc_task_proxy(proc_task, _g1h, _queues, &terminator); |
|
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|
5155 |
|
4dfb2df418f2
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|
5156 _g1h->set_par_threads(_active_workers); |
|
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|
5157 _workers->run_task(&proc_task_proxy); |
|
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|
5158 _g1h->set_par_threads(0); |
|
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|
5159 } |
|
4dfb2df418f2
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changeset
|
5160 |
|
4dfb2df418f2
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|
5161 // Gang task for parallel reference enqueueing. |
|
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changeset
|
5162 |
|
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|
5163 class G1STWRefEnqueueTaskProxy: public AbstractGangTask { |
|
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|
5164 typedef AbstractRefProcTaskExecutor::EnqueueTask EnqueueTask; |
|
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|
5165 EnqueueTask& _enq_task; |
|
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|
5166 |
|
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|
5167 public: |
|
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|
5168 G1STWRefEnqueueTaskProxy(EnqueueTask& enq_task) : |
|
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|
5169 AbstractGangTask("Enqueue reference objects in parallel"), |
|
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|
5170 _enq_task(enq_task) |
|
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|
5171 { } |
|
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|
5172 |
|
4728
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|
5173 virtual void work(uint worker_id) { |
|
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|
5174 _enq_task.work(worker_id); |
|
3979
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|
5175 } |
|
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|
5176 }; |
|
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changeset
|
5177 |
|
4dfb2df418f2
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|
5178 // Driver routine for parallel reference enqueing. |
|
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|
5179 // Creates an instance of the ref enqueueing gang |
|
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|
5180 // task and has the worker threads execute it. |
|
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|
5181 |
|
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|
5182 void G1STWRefProcTaskExecutor::execute(EnqueueTask& enq_task) { |
|
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|
5183 assert(_workers != NULL, "Need parallel worker threads."); |
|
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|
5184 |
|
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|
5185 G1STWRefEnqueueTaskProxy enq_task_proxy(enq_task); |
|
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|
5186 |
|
4dfb2df418f2
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|
5187 _g1h->set_par_threads(_active_workers); |
|
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|
5188 _workers->run_task(&enq_task_proxy); |
|
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|
5189 _g1h->set_par_threads(0); |
|
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|
5190 } |
|
4dfb2df418f2
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changeset
|
5191 |
|
4dfb2df418f2
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|
5192 // End of weak reference support closures |
|
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changeset
|
5193 |
|
4dfb2df418f2
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|
5194 // Abstract task used to preserve (i.e. copy) any referent objects |
|
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|
5195 // that are in the collection set and are pointed to by reference |
|
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|
5196 // objects discovered by the CM ref processor. |
|
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changeset
|
5197 |
|
4dfb2df418f2
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|
5198 class G1ParPreserveCMReferentsTask: public AbstractGangTask { |
|
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|
5199 protected: |
|
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|
5200 G1CollectedHeap* _g1h; |
|
4dfb2df418f2
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|
5201 RefToScanQueueSet *_queues; |
|
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|
5202 ParallelTaskTerminator _terminator; |
|
4728
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|
5203 uint _n_workers; |
|
3979
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|
5204 |
|
4dfb2df418f2
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|
5205 public: |
|
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changeset
|
5206 G1ParPreserveCMReferentsTask(G1CollectedHeap* g1h,int workers, RefToScanQueueSet *task_queues) : |
|
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changeset
|
5207 AbstractGangTask("ParPreserveCMReferents"), |
|
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diff
changeset
|
5208 _g1h(g1h), |
|
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diff
changeset
|
5209 _queues(task_queues), |
|
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diff
changeset
|
5210 _terminator(workers, _queues), |
|
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diff
changeset
|
5211 _n_workers(workers) |
|
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diff
changeset
|
5212 { } |
|
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diff
changeset
|
5213 |
|
4728
441e946dc1af
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diff
changeset
|
5214 void work(uint worker_id) { |
|
3979
4dfb2df418f2
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parents:
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diff
changeset
|
5215 ResourceMark rm; |
|
4dfb2df418f2
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diff
changeset
|
5216 HandleMark hm; |
|
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diff
changeset
|
5217 |
|
4728
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jmasa
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diff
changeset
|
5218 G1ParScanThreadState pss(_g1h, worker_id); |
|
3979
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diff
changeset
|
5219 G1ParScanHeapEvacClosure scan_evac_cl(_g1h, &pss, NULL); |
|
4dfb2df418f2
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changeset
|
5220 G1ParScanHeapEvacFailureClosure evac_failure_cl(_g1h, &pss, NULL); |
|
4dfb2df418f2
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changeset
|
5221 G1ParScanPartialArrayClosure partial_scan_cl(_g1h, &pss, NULL); |
|
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changeset
|
5222 |
|
4dfb2df418f2
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diff
changeset
|
5223 pss.set_evac_closure(&scan_evac_cl); |
|
4dfb2df418f2
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diff
changeset
|
5224 pss.set_evac_failure_closure(&evac_failure_cl); |
|
4dfb2df418f2
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diff
changeset
|
5225 pss.set_partial_scan_closure(&partial_scan_cl); |
|
4dfb2df418f2
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diff
changeset
|
5226 |
|
4dfb2df418f2
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diff
changeset
|
5227 assert(pss.refs()->is_empty(), "both queue and overflow should be empty"); |
|
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diff
changeset
|
5228 |
|
4dfb2df418f2
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parents:
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diff
changeset
|
5229 |
|
4dfb2df418f2
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parents:
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diff
changeset
|
5230 G1ParScanExtRootClosure only_copy_non_heap_cl(_g1h, &pss, NULL); |
|
4dfb2df418f2
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changeset
|
5231 G1ParScanPermClosure only_copy_perm_cl(_g1h, &pss, NULL); |
|
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changeset
|
5232 |
|
4dfb2df418f2
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diff
changeset
|
5233 G1ParScanAndMarkExtRootClosure copy_mark_non_heap_cl(_g1h, &pss, NULL); |
|
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changeset
|
5234 G1ParScanAndMarkPermClosure copy_mark_perm_cl(_g1h, &pss, NULL); |
|
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changeset
|
5235 |
|
4dfb2df418f2
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diff
changeset
|
5236 OopClosure* copy_non_heap_cl = &only_copy_non_heap_cl; |
|
4dfb2df418f2
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changeset
|
5237 OopsInHeapRegionClosure* copy_perm_cl = &only_copy_perm_cl; |
|
4dfb2df418f2
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diff
changeset
|
5238 |
|
4dfb2df418f2
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parents:
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diff
changeset
|
5239 if (_g1h->g1_policy()->during_initial_mark_pause()) { |
|
4dfb2df418f2
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johnc
parents:
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diff
changeset
|
5240 // We also need to mark copied objects. |
|
4dfb2df418f2
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parents:
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diff
changeset
|
5241 copy_non_heap_cl = ©_mark_non_heap_cl; |
|
4dfb2df418f2
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parents:
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diff
changeset
|
5242 copy_perm_cl = ©_mark_perm_cl; |
|
4dfb2df418f2
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johnc
parents:
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diff
changeset
|
5243 } |
|
4dfb2df418f2
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parents:
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diff
changeset
|
5244 |
|
4dfb2df418f2
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parents:
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diff
changeset
|
5245 // Is alive closure |
|
4dfb2df418f2
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parents:
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diff
changeset
|
5246 G1AlwaysAliveClosure always_alive(_g1h); |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
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diff
changeset
|
5247 |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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parents:
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diff
changeset
|
5248 // Copying keep alive closure. Applied to referent objects that need |
|
4dfb2df418f2
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parents:
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diff
changeset
|
5249 // to be copied. |
|
4dfb2df418f2
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diff
changeset
|
5250 G1CopyingKeepAliveClosure keep_alive(_g1h, copy_non_heap_cl, copy_perm_cl, &pss); |
|
4dfb2df418f2
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parents:
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diff
changeset
|
5251 |
|
4dfb2df418f2
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diff
changeset
|
5252 ReferenceProcessor* rp = _g1h->ref_processor_cm(); |
|
4dfb2df418f2
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parents:
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diff
changeset
|
5253 |
|
4728
441e946dc1af
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jmasa
parents:
4711
diff
changeset
|
5254 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:
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diff
changeset
|
5255 uint stride = MIN2(MAX2(_n_workers, 1U), limit); |
|
3979
4dfb2df418f2
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parents:
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diff
changeset
|
5256 |
|
4dfb2df418f2
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parents:
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diff
changeset
|
5257 // limit is set using max_num_q() - which was set using ParallelGCThreads. |
|
4dfb2df418f2
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parents:
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diff
changeset
|
5258 // So this must be true - but assert just in case someone decides to |
|
4dfb2df418f2
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parents:
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diff
changeset
|
5259 // change the worker ids. |
|
4728
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jmasa
parents:
4711
diff
changeset
|
5260 assert(0 <= worker_id && worker_id < limit, "sanity"); |
|
3979
4dfb2df418f2
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parents:
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diff
changeset
|
5261 assert(!rp->discovery_is_atomic(), "check this code"); |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5262 |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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parents:
3973
diff
changeset
|
5263 // Select discovered lists [i, i+stride, i+2*stride,...,limit) |
|
4728
441e946dc1af
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jmasa
parents:
4711
diff
changeset
|
5264 for (uint idx = worker_id; idx < limit; idx += stride) { |
|
4014
bf2d2b8b1726
7095243: Disambiguate ReferenceProcessor::_discoveredSoftRefs
johnc
parents:
4013
diff
changeset
|
5265 DiscoveredList& ref_list = rp->discovered_refs()[idx]; |
|
3979
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5266 |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5267 DiscoveredListIterator iter(ref_list, &keep_alive, &always_alive); |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5268 while (iter.has_next()) { |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5269 // Since discovery is not atomic for the CM ref processor, we |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5270 // can see some null referent objects. |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5271 iter.load_ptrs(DEBUG_ONLY(true)); |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5272 oop ref = iter.obj(); |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5273 |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5274 // This will filter nulls. |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5275 if (iter.is_referent_alive()) { |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5276 iter.make_referent_alive(); |
|
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 iter.move_to_next(); |
|
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 } |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5281 |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5282 // Drain the queue - which may cause stealing |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5283 G1ParEvacuateFollowersClosure drain_queue(_g1h, &pss, _queues, &_terminator); |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5284 drain_queue.do_void(); |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5285 // Allocation buffers were retired at the end of G1ParEvacuateFollowersClosure |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5286 assert(pss.refs()->is_empty(), "should be"); |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5287 } |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5288 }; |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5289 |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5290 // Weak Reference processing during an evacuation pause (part 1). |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5291 void G1CollectedHeap::process_discovered_references() { |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5292 double ref_proc_start = os::elapsedTime(); |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5293 |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5294 ReferenceProcessor* rp = _ref_processor_stw; |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5295 assert(rp->discovery_enabled(), "should have been enabled"); |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5296 |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5297 // Any reference objects, in the collection set, that were 'discovered' |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5298 // 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
|
5299 // applying the external root copy closure to the discovered lists, or |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5300 // by following an RSet entry). |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5301 // |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5302 // 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
|
5303 // 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
|
5304 // processor would have seen that the reference object had already |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
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3973
diff
changeset
|
5305 // been 'discovered' and would have skipped discovering the reference, |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5306 // 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
|
5307 // 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
|
5308 // referent object. |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5309 // |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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parents:
3973
diff
changeset
|
5310 // We need to explicitly copy these referent objects - the references |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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parents:
3973
diff
changeset
|
5311 // will be processed at the end of remarking. |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5312 // |
|
4dfb2df418f2
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parents:
3973
diff
changeset
|
5313 // 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
|
5314 // 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
|
5315 // referents points to another object which is also referenced by an |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5316 // object discovered by the STW ref processor. |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5317 |
|
4728
441e946dc1af
7121618: Change type of number of GC workers to unsigned int.
jmasa
parents:
4711
diff
changeset
|
5318 uint active_workers = (G1CollectedHeap::use_parallel_gc_threads() ? |
|
4095
bca17e38de00
6593758: RFE: Enhance GC ergonomics to dynamically choose ParallelGCThreads
jmasa
parents:
4090
diff
changeset
|
5319 workers()->active_workers() : 1); |
|
bca17e38de00
6593758: RFE: Enhance GC ergonomics to dynamically choose ParallelGCThreads
jmasa
parents:
4090
diff
changeset
|
5320 |
| 4711 | 5321 assert(!G1CollectedHeap::use_parallel_gc_threads() || |
| 5322 active_workers == workers()->active_workers(), | |
| 5323 "Need to reset active_workers"); | |
| 5324 | |
|
4095
bca17e38de00
6593758: RFE: Enhance GC ergonomics to dynamically choose ParallelGCThreads
jmasa
parents:
4090
diff
changeset
|
5325 set_par_threads(active_workers); |
|
bca17e38de00
6593758: RFE: Enhance GC ergonomics to dynamically choose ParallelGCThreads
jmasa
parents:
4090
diff
changeset
|
5326 G1ParPreserveCMReferentsTask keep_cm_referents(this, active_workers, _task_queues); |
|
3979
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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parents:
3973
diff
changeset
|
5327 |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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parents:
3973
diff
changeset
|
5328 if (G1CollectedHeap::use_parallel_gc_threads()) { |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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parents:
3973
diff
changeset
|
5329 workers()->run_task(&keep_cm_referents); |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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parents:
3973
diff
changeset
|
5330 } else { |
|
4dfb2df418f2
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3973
diff
changeset
|
5331 keep_cm_referents.work(0); |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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parents:
3973
diff
changeset
|
5332 } |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5333 |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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parents:
3973
diff
changeset
|
5334 set_par_threads(0); |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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parents:
3973
diff
changeset
|
5335 |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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parents:
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diff
changeset
|
5336 // Closure to test whether a referent is alive. |
|
4dfb2df418f2
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parents:
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diff
changeset
|
5337 G1STWIsAliveClosure is_alive(this); |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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parents:
3973
diff
changeset
|
5338 |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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parents:
3973
diff
changeset
|
5339 // Even when parallel reference processing is enabled, the processing |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5340 // of JNI refs is serial and performed serially by the current thread |
|
4dfb2df418f2
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johnc
parents:
3973
diff
changeset
|
5341 // 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
|
5342 // JNI refs. |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5343 |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
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diff
changeset
|
5344 // Use only a single queue for this PSS. |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5345 G1ParScanThreadState pss(this, 0); |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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parents:
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diff
changeset
|
5346 |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
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diff
changeset
|
5347 // We do not embed a reference processor in the copying/scanning |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5348 // closures while we're actually processing the discovered |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5349 // reference objects. |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
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diff
changeset
|
5350 G1ParScanHeapEvacClosure scan_evac_cl(this, &pss, NULL); |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
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diff
changeset
|
5351 G1ParScanHeapEvacFailureClosure evac_failure_cl(this, &pss, NULL); |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
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diff
changeset
|
5352 G1ParScanPartialArrayClosure partial_scan_cl(this, &pss, NULL); |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
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diff
changeset
|
5353 |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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parents:
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diff
changeset
|
5354 pss.set_evac_closure(&scan_evac_cl); |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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parents:
3973
diff
changeset
|
5355 pss.set_evac_failure_closure(&evac_failure_cl); |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5356 pss.set_partial_scan_closure(&partial_scan_cl); |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5357 |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5358 assert(pss.refs()->is_empty(), "pre-condition"); |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5359 |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5360 G1ParScanExtRootClosure only_copy_non_heap_cl(this, &pss, NULL); |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
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diff
changeset
|
5361 G1ParScanPermClosure only_copy_perm_cl(this, &pss, NULL); |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5362 |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5363 G1ParScanAndMarkExtRootClosure copy_mark_non_heap_cl(this, &pss, NULL); |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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parents:
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diff
changeset
|
5364 G1ParScanAndMarkPermClosure copy_mark_perm_cl(this, &pss, NULL); |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5365 |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5366 OopClosure* copy_non_heap_cl = &only_copy_non_heap_cl; |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5367 OopsInHeapRegionClosure* copy_perm_cl = &only_copy_perm_cl; |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5368 |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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parents:
3973
diff
changeset
|
5369 if (_g1h->g1_policy()->during_initial_mark_pause()) { |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5370 // We also need to mark copied objects. |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5371 copy_non_heap_cl = ©_mark_non_heap_cl; |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5372 copy_perm_cl = ©_mark_perm_cl; |
|
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 |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5375 // Keep alive closure. |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5376 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
|
5377 |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5378 // Serial Complete GC closure |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5379 G1STWDrainQueueClosure drain_queue(this, &pss); |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5380 |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5381 // Setup the soft refs policy... |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5382 rp->setup_policy(false); |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5383 |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5384 if (!rp->processing_is_mt()) { |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5385 // Serial reference processing... |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5386 rp->process_discovered_references(&is_alive, |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5387 &keep_alive, |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5388 &drain_queue, |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5389 NULL); |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5390 } else { |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5391 // Parallel reference processing |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5392 assert(rp->num_q() == active_workers, "sanity"); |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5393 assert(active_workers <= rp->max_num_q(), "sanity"); |
|
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 G1STWRefProcTaskExecutor par_task_executor(this, workers(), _task_queues, active_workers); |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5396 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
|
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 // We have completed copying any necessary live referent objects |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5400 // (that were not copied during the actual pause) so we can |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5401 // retire any active alloc buffers |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5402 pss.retire_alloc_buffers(); |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5403 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
|
5404 |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5405 double ref_proc_time = os::elapsedTime() - ref_proc_start; |
|
6219
922993931b3d
7178361: G1: Make sure that PrintGC and PrintGCDetails use the same timing for the GC pause
brutisso
parents:
6188
diff
changeset
|
5406 g1_policy()->phase_times()->record_ref_proc_time(ref_proc_time * 1000.0); |
|
3979
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5407 } |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5408 |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5409 // Weak Reference processing during an evacuation pause (part 2). |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5410 void G1CollectedHeap::enqueue_discovered_references() { |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5411 double ref_enq_start = os::elapsedTime(); |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5412 |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5413 ReferenceProcessor* rp = _ref_processor_stw; |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5414 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
|
5415 |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5416 // Now enqueue any remaining on the discovered lists on to |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5417 // the pending list. |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5418 if (!rp->processing_is_mt()) { |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5419 // Serial reference processing... |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5420 rp->enqueue_discovered_references(); |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5421 } else { |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5422 // Parallel reference enqueuing |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5423 |
|
4728
441e946dc1af
7121618: Change type of number of GC workers to unsigned int.
jmasa
parents:
4711
diff
changeset
|
5424 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
|
5425 assert(active_workers == workers()->active_workers(), |
|
bca17e38de00
6593758: RFE: Enhance GC ergonomics to dynamically choose ParallelGCThreads
jmasa
parents:
4090
diff
changeset
|
5426 "Need to reset active_workers"); |
|
3979
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5427 assert(rp->num_q() == active_workers, "sanity"); |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5428 assert(active_workers <= rp->max_num_q(), "sanity"); |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5429 |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5430 G1STWRefProcTaskExecutor par_task_executor(this, workers(), _task_queues, active_workers); |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5431 rp->enqueue_discovered_references(&par_task_executor); |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5432 } |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5433 |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5434 rp->verify_no_references_recorded(); |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5435 assert(!rp->discovery_enabled(), "should have been disabled"); |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5436 |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5437 // FIXME |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5438 // 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
|
5439 // 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
|
5440 // and could signicantly increase the pause time. |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5441 |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5442 double ref_enq_time = os::elapsedTime() - ref_enq_start; |
|
6219
922993931b3d
7178361: G1: Make sure that PrintGC and PrintGCDetails use the same timing for the GC pause
brutisso
parents:
6188
diff
changeset
|
5443 g1_policy()->phase_times()->record_ref_enq_time(ref_enq_time * 1000.0); |
|
3979
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5444 } |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5445 |
| 342 | 5446 void G1CollectedHeap::evacuate_collection_set() { |
|
4781
bacb651cf5bf
7113006: G1: excessive ergo output when an evac failure happens
tonyp
parents:
4728
diff
changeset
|
5447 _expand_heap_after_alloc_failure = true; |
| 342 | 5448 set_evacuation_failed(false); |
| 5449 | |
| 5450 g1_rem_set()->prepare_for_oops_into_collection_set_do(); | |
| 5451 concurrent_g1_refine()->set_use_cache(false); | |
| 889 | 5452 concurrent_g1_refine()->clear_hot_cache_claimed_index(); |
| 5453 | |
|
4728
441e946dc1af
7121618: Change type of number of GC workers to unsigned int.
jmasa
parents:
4711
diff
changeset
|
5454 uint n_workers; |
|
4095
bca17e38de00
6593758: RFE: Enhance GC ergonomics to dynamically choose ParallelGCThreads
jmasa
parents:
4090
diff
changeset
|
5455 if (G1CollectedHeap::use_parallel_gc_threads()) { |
|
bca17e38de00
6593758: RFE: Enhance GC ergonomics to dynamically choose ParallelGCThreads
jmasa
parents:
4090
diff
changeset
|
5456 n_workers = |
|
bca17e38de00
6593758: RFE: Enhance GC ergonomics to dynamically choose ParallelGCThreads
jmasa
parents:
4090
diff
changeset
|
5457 AdaptiveSizePolicy::calc_active_workers(workers()->total_workers(), |
|
bca17e38de00
6593758: RFE: Enhance GC ergonomics to dynamically choose ParallelGCThreads
jmasa
parents:
4090
diff
changeset
|
5458 workers()->active_workers(), |
|
bca17e38de00
6593758: RFE: Enhance GC ergonomics to dynamically choose ParallelGCThreads
jmasa
parents:
4090
diff
changeset
|
5459 Threads::number_of_non_daemon_threads()); |
|
bca17e38de00
6593758: RFE: Enhance GC ergonomics to dynamically choose ParallelGCThreads
jmasa
parents:
4090
diff
changeset
|
5460 assert(UseDynamicNumberOfGCThreads || |
|
bca17e38de00
6593758: RFE: Enhance GC ergonomics to dynamically choose ParallelGCThreads
jmasa
parents:
4090
diff
changeset
|
5461 n_workers == workers()->total_workers(), |
|
bca17e38de00
6593758: RFE: Enhance GC ergonomics to dynamically choose ParallelGCThreads
jmasa
parents:
4090
diff
changeset
|
5462 "If not dynamic should be using all the workers"); |
| 4711 | 5463 workers()->set_active_workers(n_workers); |
|
4095
bca17e38de00
6593758: RFE: Enhance GC ergonomics to dynamically choose ParallelGCThreads
jmasa
parents:
4090
diff
changeset
|
5464 set_par_threads(n_workers); |
|
bca17e38de00
6593758: RFE: Enhance GC ergonomics to dynamically choose ParallelGCThreads
jmasa
parents:
4090
diff
changeset
|
5465 } else { |
|
bca17e38de00
6593758: RFE: Enhance GC ergonomics to dynamically choose ParallelGCThreads
jmasa
parents:
4090
diff
changeset
|
5466 assert(n_par_threads() == 0, |
|
bca17e38de00
6593758: RFE: Enhance GC ergonomics to dynamically choose ParallelGCThreads
jmasa
parents:
4090
diff
changeset
|
5467 "Should be the original non-parallel value"); |
|
bca17e38de00
6593758: RFE: Enhance GC ergonomics to dynamically choose ParallelGCThreads
jmasa
parents:
4090
diff
changeset
|
5468 n_workers = 1; |
|
bca17e38de00
6593758: RFE: Enhance GC ergonomics to dynamically choose ParallelGCThreads
jmasa
parents:
4090
diff
changeset
|
5469 } |
|
bca17e38de00
6593758: RFE: Enhance GC ergonomics to dynamically choose ParallelGCThreads
jmasa
parents:
4090
diff
changeset
|
5470 |
|
bca17e38de00
6593758: RFE: Enhance GC ergonomics to dynamically choose ParallelGCThreads
jmasa
parents:
4090
diff
changeset
|
5471 G1ParTask g1_par_task(this, _task_queues); |
| 342 | 5472 |
| 5473 init_for_evac_failure(NULL); | |
| 5474 | |
| 5475 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
|
5476 |
|
4f360ec815ba
6720309: G1: don't synchronously update RSet during evacuation pauses
iveresov
parents:
595
diff
changeset
|
5477 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
|
5478 double start_par_time_sec = os::elapsedTime(); |
|
500023bd0818
7143511: G1: Another instance of high GC Worker Other time (50ms)
johnc
parents:
5963
diff
changeset
|
5479 double end_par_time_sec; |
|
500023bd0818
7143511: G1: Another instance of high GC Worker Other time (50ms)
johnc
parents:
5963
diff
changeset
|
5480 |
|
500023bd0818
7143511: G1: Another instance of high GC Worker Other time (50ms)
johnc
parents:
5963
diff
changeset
|
5481 { |
|
989
148e5441d916
6863023: need non-perm oops in code cache for JSR 292
jrose
parents:
890
diff
changeset
|
5482 StrongRootsScope srs(this); |
|
5986
500023bd0818
7143511: G1: Another instance of high GC Worker Other time (50ms)
johnc
parents:
5963
diff
changeset
|
5483 |
|
500023bd0818
7143511: G1: Another instance of high GC Worker Other time (50ms)
johnc
parents:
5963
diff
changeset
|
5484 if (G1CollectedHeap::use_parallel_gc_threads()) { |
|
500023bd0818
7143511: G1: Another instance of high GC Worker Other time (50ms)
johnc
parents:
5963
diff
changeset
|
5485 // 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
|
5486 if (ParallelGCVerbose) G1ParScanThreadState::print_termination_stats_hdr(); |
|
500023bd0818
7143511: G1: Another instance of high GC Worker Other time (50ms)
johnc
parents:
5963
diff
changeset
|
5487 // These tasks use ShareHeap::_process_strong_tasks |
|
500023bd0818
7143511: G1: Another instance of high GC Worker Other time (50ms)
johnc
parents:
5963
diff
changeset
|
5488 assert(UseDynamicNumberOfGCThreads || |
|
500023bd0818
7143511: G1: Another instance of high GC Worker Other time (50ms)
johnc
parents:
5963
diff
changeset
|
5489 workers()->active_workers() == workers()->total_workers(), |
|
500023bd0818
7143511: G1: Another instance of high GC Worker Other time (50ms)
johnc
parents:
5963
diff
changeset
|
5490 "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
|
5491 workers()->run_task(&g1_par_task); |
|
500023bd0818
7143511: G1: Another instance of high GC Worker Other time (50ms)
johnc
parents:
5963
diff
changeset
|
5492 } else { |
|
500023bd0818
7143511: G1: Another instance of high GC Worker Other time (50ms)
johnc
parents:
5963
diff
changeset
|
5493 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
|
5494 g1_par_task.work(0); |
|
500023bd0818
7143511: G1: Another instance of high GC Worker Other time (50ms)
johnc
parents:
5963
diff
changeset
|
5495 } |
|
500023bd0818
7143511: G1: Another instance of high GC Worker Other time (50ms)
johnc
parents:
5963
diff
changeset
|
5496 end_par_time_sec = os::elapsedTime(); |
|
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 // 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
|
5499 // 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
|
5500 // 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
|
5501 // 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
|
5502 // reported parallel time. |
|
500023bd0818
7143511: G1: Another instance of high GC Worker Other time (50ms)
johnc
parents:
5963
diff
changeset
|
5503 } |
|
500023bd0818
7143511: G1: Another instance of high GC Worker Other time (50ms)
johnc
parents:
5963
diff
changeset
|
5504 |
|
500023bd0818
7143511: G1: Another instance of high GC Worker Other time (50ms)
johnc
parents:
5963
diff
changeset
|
5505 double par_time_ms = (end_par_time_sec - start_par_time_sec) * 1000.0; |
|
6219
922993931b3d
7178361: G1: Make sure that PrintGC and PrintGCDetails use the same timing for the GC pause
brutisso
parents:
6188
diff
changeset
|
5506 g1_policy()->phase_times()->record_par_time(par_time_ms); |
|
5986
500023bd0818
7143511: G1: Another instance of high GC Worker Other time (50ms)
johnc
parents:
5963
diff
changeset
|
5507 |
|
500023bd0818
7143511: G1: Another instance of high GC Worker Other time (50ms)
johnc
parents:
5963
diff
changeset
|
5508 double code_root_fixup_time_ms = |
|
500023bd0818
7143511: G1: Another instance of high GC Worker Other time (50ms)
johnc
parents:
5963
diff
changeset
|
5509 (os::elapsedTime() - end_par_time_sec) * 1000.0; |
|
6219
922993931b3d
7178361: G1: Make sure that PrintGC and PrintGCDetails use the same timing for the GC pause
brutisso
parents:
6188
diff
changeset
|
5510 g1_policy()->phase_times()->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
|
5511 |
| 342 | 5512 set_par_threads(0); |
|
1974
fd1d227ef1b9
6983204: G1: Nightly test nsk/regression/b4958615 failing with +ExplicitGCInvokesConcurrent
johnc
parents:
1973
diff
changeset
|
5513 |
|
3979
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5514 // Process any discovered reference objects - we have |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5515 // to do this _before_ we retire the GC alloc regions |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5516 // as we may have to copy some 'reachable' referent |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5517 // objects (and their reachable sub-graphs) that were |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5518 // not copied during the pause. |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5519 process_discovered_references(); |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5520 |
|
1974
fd1d227ef1b9
6983204: G1: Nightly test nsk/regression/b4958615 failing with +ExplicitGCInvokesConcurrent
johnc
parents:
1973
diff
changeset
|
5521 // Weak root processing. |
|
fd1d227ef1b9
6983204: G1: Nightly test nsk/regression/b4958615 failing with +ExplicitGCInvokesConcurrent
johnc
parents:
1973
diff
changeset
|
5522 // 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
|
5523 // 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
|
5524 // here too. |
| 342 | 5525 { |
|
3979
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5526 G1STWIsAliveClosure is_alive(this); |
| 342 | 5527 G1KeepAliveClosure keep_alive(this); |
| 5528 JNIHandles::weak_oops_do(&is_alive, &keep_alive); | |
| 5529 } | |
|
3979
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5530 |
|
3830
f44782f04dd4
7039627: G1: avoid BOT updates for survivor allocations and dirty survivor regions incrementally
tonyp
parents:
3824
diff
changeset
|
5531 release_gc_alloc_regions(); |
| 342 | 5532 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
|
5533 |
| 889 | 5534 concurrent_g1_refine()->clear_hot_cache(); |
| 342 | 5535 concurrent_g1_refine()->set_use_cache(true); |
| 5536 | |
| 5537 finalize_for_evac_failure(); | |
| 5538 | |
| 5539 if (evacuation_failed()) { | |
| 5540 remove_self_forwarding_pointers(); | |
|
6007
5c86f8211d1e
7160728: Introduce an extra logging level for G1 logging
brutisso
parents:
5987
diff
changeset
|
5541 if (G1Log::finer()) { |
| 6059 | 5542 gclog_or_tty->print(" (to-space exhausted)"); |
|
6007
5c86f8211d1e
7160728: Introduce an extra logging level for G1 logging
brutisso
parents:
5987
diff
changeset
|
5543 } else if (G1Log::fine()) { |
| 342 | 5544 gclog_or_tty->print("--"); |
| 5545 } | |
| 5546 } | |
| 5547 | |
|
3979
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5548 // Enqueue any remaining references remaining on the STW |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5549 // reference processor's discovered lists. We need to do |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5550 // this after the card table is cleaned (and verified) as |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5551 // the act of enqueuing entries on to the pending list |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5552 // will log these updates (and dirty their associated |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5553 // cards). We need these updates logged to update any |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5554 // RSets. |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5555 enqueue_discovered_references(); |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5556 |
|
616
4f360ec815ba
6720309: G1: don't synchronously update RSet during evacuation pauses
iveresov
parents:
595
diff
changeset
|
5557 if (G1DeferredRSUpdate) { |
|
4f360ec815ba
6720309: G1: don't synchronously update RSet during evacuation pauses
iveresov
parents:
595
diff
changeset
|
5558 RedirtyLoggedCardTableEntryFastClosure redirty; |
|
4f360ec815ba
6720309: G1: don't synchronously update RSet during evacuation pauses
iveresov
parents:
595
diff
changeset
|
5559 dirty_card_queue_set().set_closure(&redirty); |
|
4f360ec815ba
6720309: G1: don't synchronously update RSet during evacuation pauses
iveresov
parents:
595
diff
changeset
|
5560 dirty_card_queue_set().apply_closure_to_all_completed_buffers(); |
| 1111 | 5561 |
| 5562 DirtyCardQueueSet& dcq = JavaThread::dirty_card_queue_set(); | |
| 5563 dcq.merge_bufferlists(&dirty_card_queue_set()); | |
|
616
4f360ec815ba
6720309: G1: don't synchronously update RSet during evacuation pauses
iveresov
parents:
595
diff
changeset
|
5564 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
|
5565 } |
| 342 | 5566 COMPILER2_PRESENT(DerivedPointerTable::update_pointers()); |
| 5567 } | |
| 5568 | |
| 2173 | 5569 void G1CollectedHeap::free_region_if_empty(HeapRegion* hr, |
| 2152 | 5570 size_t* pre_used, |
| 5571 FreeRegionList* free_list, | |
| 4072 | 5572 OldRegionSet* old_proxy_set, |
| 2152 | 5573 HumongousRegionSet* humongous_proxy_set, |
| 2173 | 5574 HRRSCleanupTask* hrrs_cleanup_task, |
| 2152 | 5575 bool par) { |
| 5576 if (hr->used() > 0 && hr->max_live_bytes() == 0 && !hr->is_young()) { | |
| 5577 if (hr->isHumongous()) { | |
| 5578 assert(hr->startsHumongous(), "we should only see starts humongous"); | |
| 5579 free_humongous_region(hr, pre_used, free_list, humongous_proxy_set, par); | |
| 5580 } else { | |
| 4072 | 5581 _old_set.remove_with_proxy(hr, old_proxy_set); |
| 2152 | 5582 free_region(hr, pre_used, free_list, par); |
| 342 | 5583 } |
| 2173 | 5584 } else { |
| 5585 hr->rem_set()->do_cleanup_work(hrrs_cleanup_task); | |
| 342 | 5586 } |
| 5587 } | |
| 5588 | |
| 2152 | 5589 void G1CollectedHeap::free_region(HeapRegion* hr, |
| 5590 size_t* pre_used, | |
| 5591 FreeRegionList* free_list, | |
| 5592 bool par) { | |
| 5593 assert(!hr->isHumongous(), "this is only for non-humongous regions"); | |
| 5594 assert(!hr->is_empty(), "the region should not be empty"); | |
| 5595 assert(free_list != NULL, "pre-condition"); | |
| 5596 | |
| 5597 *pre_used += hr->used(); | |
| 5598 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
|
5599 free_list->add_as_head(hr); |
| 2152 | 5600 } |
| 5601 | |
| 5602 void G1CollectedHeap::free_humongous_region(HeapRegion* hr, | |
| 5603 size_t* pre_used, | |
| 5604 FreeRegionList* free_list, | |
| 5605 HumongousRegionSet* humongous_proxy_set, | |
| 5606 bool par) { | |
| 5607 assert(hr->startsHumongous(), "this is only for starts humongous regions"); | |
| 5608 assert(free_list != NULL, "pre-condition"); | |
| 5609 assert(humongous_proxy_set != NULL, "pre-condition"); | |
| 5610 | |
| 5611 size_t hr_used = hr->used(); | |
| 5612 size_t hr_capacity = hr->capacity(); | |
| 5613 size_t hr_pre_used = 0; | |
| 5614 _humongous_set.remove_with_proxy(hr, humongous_proxy_set); | |
| 5615 hr->set_notHumongous(); | |
| 5616 free_region(hr, &hr_pre_used, free_list, par); | |
| 5617 | |
|
6010
720b6a76dd9d
7157073: G1: type change size_t -> uint for region counts / indexes
tonyp
parents:
6008
diff
changeset
|
5618 uint i = hr->hrs_index() + 1; |
|
720b6a76dd9d
7157073: G1: type change size_t -> uint for region counts / indexes
tonyp
parents:
6008
diff
changeset
|
5619 uint num = 1; |
| 3766 | 5620 while (i < n_regions()) { |
| 5621 HeapRegion* curr_hr = region_at(i); | |
| 2152 | 5622 if (!curr_hr->continuesHumongous()) { |
| 5623 break; | |
| 5624 } | |
| 5625 curr_hr->set_notHumongous(); | |
| 5626 free_region(curr_hr, &hr_pre_used, free_list, par); | |
| 5627 num += 1; | |
| 5628 i += 1; | |
| 5629 } | |
| 5630 assert(hr_pre_used == hr_used, | |
| 5631 err_msg("hr_pre_used: "SIZE_FORMAT" and hr_used: "SIZE_FORMAT" " | |
| 5632 "should be the same", hr_pre_used, hr_used)); | |
| 5633 *pre_used += hr_pre_used; | |
| 5634 } | |
| 5635 | |
| 5636 void G1CollectedHeap::update_sets_after_freeing_regions(size_t pre_used, | |
| 5637 FreeRegionList* free_list, | |
| 4072 | 5638 OldRegionSet* old_proxy_set, |
| 2152 | 5639 HumongousRegionSet* humongous_proxy_set, |
| 5640 bool par) { | |
| 5641 if (pre_used > 0) { | |
| 5642 Mutex* lock = (par) ? ParGCRareEvent_lock : NULL; | |
| 342 | 5643 MutexLockerEx x(lock, Mutex::_no_safepoint_check_flag); |
| 2152 | 5644 assert(_summary_bytes_used >= pre_used, |
| 5645 err_msg("invariant: _summary_bytes_used: "SIZE_FORMAT" " | |
| 5646 "should be >= pre_used: "SIZE_FORMAT, | |
| 5647 _summary_bytes_used, pre_used)); | |
| 342 | 5648 _summary_bytes_used -= pre_used; |
| 2152 | 5649 } |
| 5650 if (free_list != NULL && !free_list->is_empty()) { | |
| 5651 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
|
5652 _free_list.add_as_head(free_list); |
| 2152 | 5653 } |
| 4072 | 5654 if (old_proxy_set != NULL && !old_proxy_set->is_empty()) { |
| 5655 MutexLockerEx x(OldSets_lock, Mutex::_no_safepoint_check_flag); | |
| 5656 _old_set.update_from_proxy(old_proxy_set); | |
| 5657 } | |
| 2152 | 5658 if (humongous_proxy_set != NULL && !humongous_proxy_set->is_empty()) { |
| 5659 MutexLockerEx x(OldSets_lock, Mutex::_no_safepoint_check_flag); | |
| 5660 _humongous_set.update_from_proxy(humongous_proxy_set); | |
| 342 | 5661 } |
| 5662 } | |
| 5663 | |
|
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|
5664 class G1ParCleanupCTTask : public AbstractGangTask { |
|
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|
5665 CardTableModRefBS* _ct_bs; |
|
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|
5666 G1CollectedHeap* _g1h; |
|
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|
5667 HeapRegion* volatile _su_head; |
|
796
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|
5668 public: |
|
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changeset
|
5669 G1ParCleanupCTTask(CardTableModRefBS* ct_bs, |
|
3830
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7039627: G1: avoid BOT updates for survivor allocations and dirty survivor regions incrementally
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|
5670 G1CollectedHeap* g1h) : |
|
796
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|
5671 AbstractGangTask("G1 Par Cleanup CT Task"), |
|
3830
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|
5672 _ct_bs(ct_bs), _g1h(g1h) { } |
|
796
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|
5673 |
|
4728
441e946dc1af
7121618: Change type of number of GC workers to unsigned int.
jmasa
parents:
4711
diff
changeset
|
5674 void work(uint worker_id) { |
|
796
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|
5675 HeapRegion* r; |
|
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|
5676 while (r = _g1h->pop_dirty_cards_region()) { |
|
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|
5677 clear_cards(r); |
|
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|
5678 } |
|
940
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|
5679 } |
|
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|
5680 |
|
796
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|
5681 void clear_cards(HeapRegion* r) { |
|
3830
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|
5682 // Cards of the survivors should have already been dirtied. |
|
1394
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|
5683 if (!r->is_survivor()) { |
|
796
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|
5684 _ct_bs->clear(MemRegion(r->bottom(), r->end())); |
|
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|
5685 } |
|
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|
5686 } |
|
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|
5687 }; |
|
29e7d79232b9
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|
5688 |
|
940
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6841313: G1: dirty cards of survivor regions in parallel
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|
5689 #ifndef PRODUCT |
|
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|
5690 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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changeset
|
5691 G1CollectedHeap* _g1h; |
|
940
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|
5692 CardTableModRefBS* _ct_bs; |
|
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|
5693 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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|
5694 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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|
5695 : _g1h(g1h), _ct_bs(ct_bs) { } |
|
2433
abdfc822206f
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changeset
|
5696 virtual bool doHeapRegion(HeapRegion* r) { |
|
1394
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|
5697 if (r->is_survivor()) { |
|
3317
063382f9b575
7035144: G1: nightly failure: Non-dirty cards in region that should be dirty (failures still exist...)
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changeset
|
5698 _g1h->verify_dirty_region(r); |
|
940
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|
5699 } else { |
|
3317
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changeset
|
5700 _g1h->verify_not_dirty_region(r); |
|
940
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diff
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|
5701 } |
|
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diff
changeset
|
5702 return false; |
|
8624da129f0b
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apetrusenko
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936
diff
changeset
|
5703 } |
|
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|
5704 }; |
|
2433
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|
5705 |
|
3317
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changeset
|
5706 void G1CollectedHeap::verify_not_dirty_region(HeapRegion* hr) { |
|
063382f9b575
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|
5707 // All of the region should be clean. |
|
063382f9b575
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changeset
|
5708 CardTableModRefBS* ct_bs = (CardTableModRefBS*)barrier_set(); |
|
063382f9b575
7035144: G1: nightly failure: Non-dirty cards in region that should be dirty (failures still exist...)
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changeset
|
5709 MemRegion mr(hr->bottom(), hr->end()); |
|
063382f9b575
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changeset
|
5710 ct_bs->verify_not_dirty_region(mr); |
|
063382f9b575
7035144: G1: nightly failure: Non-dirty cards in region that should be dirty (failures still exist...)
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changeset
|
5711 } |
|
063382f9b575
7035144: G1: nightly failure: Non-dirty cards in region that should be dirty (failures still exist...)
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changeset
|
5712 |
|
063382f9b575
7035144: G1: nightly failure: Non-dirty cards in region that should be dirty (failures still exist...)
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diff
changeset
|
5713 void G1CollectedHeap::verify_dirty_region(HeapRegion* hr) { |
|
063382f9b575
7035144: G1: nightly failure: Non-dirty cards in region that should be dirty (failures still exist...)
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parents:
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diff
changeset
|
5714 // We cannot guarantee that [bottom(),end()] is dirty. Threads |
|
063382f9b575
7035144: G1: nightly failure: Non-dirty cards in region that should be dirty (failures still exist...)
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diff
changeset
|
5715 // dirty allocated blocks as they allocate them. The thread that |
|
063382f9b575
7035144: G1: nightly failure: Non-dirty cards in region that should be dirty (failures still exist...)
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parents:
3293
diff
changeset
|
5716 // retires each region and replaces it with a new one will do a |
|
063382f9b575
7035144: G1: nightly failure: Non-dirty cards in region that should be dirty (failures still exist...)
tonyp
parents:
3293
diff
changeset
|
5717 // maximal allocation to fill in [pre_dummy_top(),end()] but will |
|
063382f9b575
7035144: G1: nightly failure: Non-dirty cards in region that should be dirty (failures still exist...)
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parents:
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diff
changeset
|
5718 // not dirty that area (one less thing to have to do while holding |
|
063382f9b575
7035144: G1: nightly failure: Non-dirty cards in region that should be dirty (failures still exist...)
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3293
diff
changeset
|
5719 // a lock). So we can only verify that [bottom(),pre_dummy_top()] |
|
063382f9b575
7035144: G1: nightly failure: Non-dirty cards in region that should be dirty (failures still exist...)
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3293
diff
changeset
|
5720 // is dirty. |
|
063382f9b575
7035144: G1: nightly failure: Non-dirty cards in region that should be dirty (failures still exist...)
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3293
diff
changeset
|
5721 CardTableModRefBS* ct_bs = (CardTableModRefBS*) barrier_set(); |
|
063382f9b575
7035144: G1: nightly failure: Non-dirty cards in region that should be dirty (failures still exist...)
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parents:
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diff
changeset
|
5722 MemRegion mr(hr->bottom(), hr->pre_dummy_top()); |
|
063382f9b575
7035144: G1: nightly failure: Non-dirty cards in region that should be dirty (failures still exist...)
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diff
changeset
|
5723 ct_bs->verify_dirty_region(mr); |
|
063382f9b575
7035144: G1: nightly failure: Non-dirty cards in region that should be dirty (failures still exist...)
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diff
changeset
|
5724 } |
|
063382f9b575
7035144: G1: nightly failure: Non-dirty cards in region that should be dirty (failures still exist...)
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diff
changeset
|
5725 |
|
2433
abdfc822206f
7023069: G1: Introduce symmetric locking in the slow allocation path
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diff
changeset
|
5726 void G1CollectedHeap::verify_dirty_young_list(HeapRegion* head) { |
|
3317
063382f9b575
7035144: G1: nightly failure: Non-dirty cards in region that should be dirty (failures still exist...)
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parents:
3293
diff
changeset
|
5727 CardTableModRefBS* ct_bs = (CardTableModRefBS*) barrier_set(); |
|
2433
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7023069: G1: Introduce symmetric locking in the slow allocation path
tonyp
parents:
2432
diff
changeset
|
5728 for (HeapRegion* hr = head; hr != NULL; hr = hr->get_next_young_region()) { |
|
3317
063382f9b575
7035144: G1: nightly failure: Non-dirty cards in region that should be dirty (failures still exist...)
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parents:
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diff
changeset
|
5729 verify_dirty_region(hr); |
|
2433
abdfc822206f
7023069: G1: Introduce symmetric locking in the slow allocation path
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parents:
2432
diff
changeset
|
5730 } |
|
abdfc822206f
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tonyp
parents:
2432
diff
changeset
|
5731 } |
|
abdfc822206f
7023069: G1: Introduce symmetric locking in the slow allocation path
tonyp
parents:
2432
diff
changeset
|
5732 |
|
abdfc822206f
7023069: G1: Introduce symmetric locking in the slow allocation path
tonyp
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2432
diff
changeset
|
5733 void G1CollectedHeap::verify_dirty_young_regions() { |
|
abdfc822206f
7023069: G1: Introduce symmetric locking in the slow allocation path
tonyp
parents:
2432
diff
changeset
|
5734 verify_dirty_young_list(_young_list->first_region()); |
|
abdfc822206f
7023069: G1: Introduce symmetric locking in the slow allocation path
tonyp
parents:
2432
diff
changeset
|
5735 verify_dirty_young_list(_young_list->first_survivor_region()); |
|
abdfc822206f
7023069: G1: Introduce symmetric locking in the slow allocation path
tonyp
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2432
diff
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|
5736 } |
|
940
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apetrusenko
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diff
changeset
|
5737 #endif |
|
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diff
changeset
|
5738 |
| 342 | 5739 void G1CollectedHeap::cleanUpCardTable() { |
| 5740 CardTableModRefBS* ct_bs = (CardTableModRefBS*) (barrier_set()); | |
| 5741 double start = os::elapsedTime(); | |
| 5742 | |
| 4023 | 5743 { |
| 5744 // Iterate over the dirty cards region list. | |
| 5745 G1ParCleanupCTTask cleanup_task(ct_bs, this); | |
| 5746 | |
| 4711 | 5747 if (G1CollectedHeap::use_parallel_gc_threads()) { |
| 5748 set_par_threads(); | |
| 4023 | 5749 workers()->run_task(&cleanup_task); |
| 5750 set_par_threads(0); | |
| 5751 } else { | |
| 5752 while (_dirty_cards_region_list) { | |
| 5753 HeapRegion* r = _dirty_cards_region_list; | |
| 5754 cleanup_task.clear_cards(r); | |
| 5755 _dirty_cards_region_list = r->get_next_dirty_cards_region(); | |
| 5756 if (_dirty_cards_region_list == r) { | |
| 5757 // The last region. | |
| 5758 _dirty_cards_region_list = NULL; | |
| 5759 } | |
| 5760 r->set_next_dirty_cards_region(NULL); | |
|
796
29e7d79232b9
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|
5761 } |
|
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diff
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|
5762 } |
| 4023 | 5763 #ifndef PRODUCT |
| 5764 if (G1VerifyCTCleanup || VerifyAfterGC) { | |
| 5765 G1VerifyCardTableCleanup cleanup_verifier(this, ct_bs); | |
| 5766 heap_region_iterate(&cleanup_verifier); | |
| 5767 } | |
| 5768 #endif | |
|
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|
5769 } |
|
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diff
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|
5770 |
| 342 | 5771 double elapsed = os::elapsedTime() - start; |
|
6219
922993931b3d
7178361: G1: Make sure that PrintGC and PrintGCDetails use the same timing for the GC pause
brutisso
parents:
6188
diff
changeset
|
5772 g1_policy()->phase_times()->record_clear_ct_time(elapsed * 1000.0); |
| 342 | 5773 } |
| 5774 | |
| 5775 void G1CollectedHeap::free_collection_set(HeapRegion* cs_head) { | |
| 2152 | 5776 size_t pre_used = 0; |
| 5777 FreeRegionList local_free_list("Local List for CSet Freeing"); | |
| 5778 | |
| 342 | 5779 double young_time_ms = 0.0; |
| 5780 double non_young_time_ms = 0.0; | |
| 5781 | |
|
1394
1316cec51b4d
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diff
changeset
|
5782 // Since the collection set is a superset of the the young list, |
|
1316cec51b4d
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diff
changeset
|
5783 // all we need to do to clear the young list is clear its |
|
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1391
diff
changeset
|
5784 // head and length, and unlink any young regions in the code below |
|
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changeset
|
5785 _young_list->clear(); |
|
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diff
changeset
|
5786 |
| 342 | 5787 G1CollectorPolicy* policy = g1_policy(); |
| 5788 | |
| 5789 double start_sec = os::elapsedTime(); | |
| 5790 bool non_young = true; | |
| 5791 | |
| 5792 HeapRegion* cur = cs_head; | |
| 5793 int age_bound = -1; | |
| 5794 size_t rs_lengths = 0; | |
| 5795 | |
| 5796 while (cur != NULL) { | |
| 2361 | 5797 assert(!is_on_master_free_list(cur), "sanity"); |
| 342 | 5798 if (non_young) { |
| 5799 if (cur->is_young()) { | |
| 5800 double end_sec = os::elapsedTime(); | |
| 5801 double elapsed_ms = (end_sec - start_sec) * 1000.0; | |
| 5802 non_young_time_ms += elapsed_ms; | |
| 5803 | |
| 5804 start_sec = os::elapsedTime(); | |
| 5805 non_young = false; | |
| 5806 } | |
| 5807 } else { | |
|
4097
dc467e8b2c5e
7112743: G1: Reduce overhead of marking closure during evacuation pauses
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4095
diff
changeset
|
5808 if (!cur->is_young()) { |
|
dc467e8b2c5e
7112743: G1: Reduce overhead of marking closure during evacuation pauses
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4095
diff
changeset
|
5809 double end_sec = os::elapsedTime(); |
|
dc467e8b2c5e
7112743: G1: Reduce overhead of marking closure during evacuation pauses
johnc
parents:
4095
diff
changeset
|
5810 double elapsed_ms = (end_sec - start_sec) * 1000.0; |
|
dc467e8b2c5e
7112743: G1: Reduce overhead of marking closure during evacuation pauses
johnc
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4095
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changeset
|
5811 young_time_ms += elapsed_ms; |
|
dc467e8b2c5e
7112743: G1: Reduce overhead of marking closure during evacuation pauses
johnc
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4095
diff
changeset
|
5812 |
|
dc467e8b2c5e
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4095
diff
changeset
|
5813 start_sec = os::elapsedTime(); |
|
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7112743: G1: Reduce overhead of marking closure during evacuation pauses
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parents:
4095
diff
changeset
|
5814 non_young = true; |
|
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4095
diff
changeset
|
5815 } |
| 342 | 5816 } |
| 5817 | |
| 5818 rs_lengths += cur->rem_set()->occupied(); | |
| 5819 | |
| 5820 HeapRegion* next = cur->next_in_collection_set(); | |
| 5821 assert(cur->in_collection_set(), "bad CS"); | |
| 5822 cur->set_next_in_collection_set(NULL); | |
| 5823 cur->set_in_collection_set(false); | |
| 5824 | |
| 5825 if (cur->is_young()) { | |
| 5826 int index = cur->young_index_in_cset(); | |
|
4090
a88de71c4e3a
7097002: G1: remove a lot of unused / redundant code from the G1CollectorPolicy class
tonyp
parents:
4073
diff
changeset
|
5827 assert(index != -1, "invariant"); |
|
6010
720b6a76dd9d
7157073: G1: type change size_t -> uint for region counts / indexes
tonyp
parents:
6008
diff
changeset
|
5828 assert((uint) index < policy->young_cset_region_length(), "invariant"); |
| 342 | 5829 size_t words_survived = _surviving_young_words[index]; |
| 5830 cur->record_surv_words_in_group(words_survived); | |
|
1394
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6819061: G1: eliminate serial Other times that are proportional to the collection set length
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diff
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|
5831 |
|
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
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diff
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|
5832 // At this point the we have 'popped' cur from the collection set |
|
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
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1391
diff
changeset
|
5833 // (linked via next_in_collection_set()) but it is still in the |
|
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
5834 // young list (linked via next_young_region()). Clear the |
|
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
5835 // _next_young_region field. |
|
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
5836 cur->set_next_young_region(NULL); |
| 342 | 5837 } else { |
| 5838 int index = cur->young_index_in_cset(); | |
|
4090
a88de71c4e3a
7097002: G1: remove a lot of unused / redundant code from the G1CollectorPolicy class
tonyp
parents:
4073
diff
changeset
|
5839 assert(index == -1, "invariant"); |
| 342 | 5840 } |
| 5841 | |
| 5842 assert( (cur->is_young() && cur->young_index_in_cset() > -1) || | |
| 5843 (!cur->is_young() && cur->young_index_in_cset() == -1), | |
| 5844 "invariant" ); | |
| 5845 | |
| 5846 if (!cur->evacuation_failed()) { | |
|
4097
dc467e8b2c5e
7112743: G1: Reduce overhead of marking closure during evacuation pauses
johnc
parents:
4095
diff
changeset
|
5847 MemRegion used_mr = cur->used_region(); |
|
dc467e8b2c5e
7112743: G1: Reduce overhead of marking closure during evacuation pauses
johnc
parents:
4095
diff
changeset
|
5848 |
| 342 | 5849 // And the region is empty. |
|
4097
dc467e8b2c5e
7112743: G1: Reduce overhead of marking closure during evacuation pauses
johnc
parents:
4095
diff
changeset
|
5850 assert(!used_mr.is_empty(), "Should not have empty regions in a CS."); |
| 2152 | 5851 free_region(cur, &pre_used, &local_free_list, false /* par */); |
| 342 | 5852 } else { |
| 5853 cur->uninstall_surv_rate_group(); | |
|
4090
a88de71c4e3a
7097002: G1: remove a lot of unused / redundant code from the G1CollectorPolicy class
tonyp
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4073
diff
changeset
|
5854 if (cur->is_young()) { |
| 342 | 5855 cur->set_young_index_in_cset(-1); |
|
4090
a88de71c4e3a
7097002: G1: remove a lot of unused / redundant code from the G1CollectorPolicy class
tonyp
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4073
diff
changeset
|
5856 } |
| 342 | 5857 cur->set_not_young(); |
| 5858 cur->set_evacuation_failed(false); | |
| 4072 | 5859 // The region is now considered to be old. |
| 5860 _old_set.add(cur); | |
| 342 | 5861 } |
| 5862 cur = next; | |
| 5863 } | |
| 5864 | |
| 5865 policy->record_max_rs_lengths(rs_lengths); | |
| 5866 policy->cset_regions_freed(); | |
| 5867 | |
| 5868 double end_sec = os::elapsedTime(); | |
| 5869 double elapsed_ms = (end_sec - start_sec) * 1000.0; | |
|
4097
dc467e8b2c5e
7112743: G1: Reduce overhead of marking closure during evacuation pauses
johnc
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4095
diff
changeset
|
5870 |
|
dc467e8b2c5e
7112743: G1: Reduce overhead of marking closure during evacuation pauses
johnc
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4095
diff
changeset
|
5871 if (non_young) { |
| 342 | 5872 non_young_time_ms += elapsed_ms; |
|
4097
dc467e8b2c5e
7112743: G1: Reduce overhead of marking closure during evacuation pauses
johnc
parents:
4095
diff
changeset
|
5873 } else { |
| 342 | 5874 young_time_ms += elapsed_ms; |
|
4097
dc467e8b2c5e
7112743: G1: Reduce overhead of marking closure during evacuation pauses
johnc
parents:
4095
diff
changeset
|
5875 } |
| 342 | 5876 |
| 2152 | 5877 update_sets_after_freeing_regions(pre_used, &local_free_list, |
| 4072 | 5878 NULL /* old_proxy_set */, |
| 2152 | 5879 NULL /* humongous_proxy_set */, |
| 5880 false /* par */); | |
|
6219
922993931b3d
7178361: G1: Make sure that PrintGC and PrintGCDetails use the same timing for the GC pause
brutisso
parents:
6188
diff
changeset
|
5881 policy->phase_times()->record_young_free_cset_time_ms(young_time_ms); |
|
922993931b3d
7178361: G1: Make sure that PrintGC and PrintGCDetails use the same timing for the GC pause
brutisso
parents:
6188
diff
changeset
|
5882 policy->phase_times()->record_non_young_free_cset_time_ms(non_young_time_ms); |
| 342 | 5883 } |
| 5884 | |
|
1394
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
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diff
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|
5885 // This routine is similar to the above but does not record |
|
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
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parents:
1391
diff
changeset
|
5886 // any policy statistics or update free lists; we are abandoning |
|
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
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parents:
1391
diff
changeset
|
5887 // the current incremental collection set in preparation of a |
|
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
5888 // full collection. After the full GC we will start to build up |
|
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
5889 // the incremental collection set again. |
|
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
5890 // This is only called when we're doing a full collection |
|
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
5891 // and is immediately followed by the tearing down of the young list. |
|
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
5892 |
|
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
5893 void G1CollectedHeap::abandon_collection_set(HeapRegion* cs_head) { |
|
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
5894 HeapRegion* cur = cs_head; |
|
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
5895 |
|
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
5896 while (cur != NULL) { |
|
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
5897 HeapRegion* next = cur->next_in_collection_set(); |
|
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
5898 assert(cur->in_collection_set(), "bad CS"); |
|
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
5899 cur->set_next_in_collection_set(NULL); |
|
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
5900 cur->set_in_collection_set(false); |
|
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
5901 cur->set_young_index_in_cset(-1); |
|
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
5902 cur = next; |
|
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
5903 } |
|
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
5904 } |
|
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
5905 |
| 2152 | 5906 void G1CollectedHeap::set_free_regions_coming() { |
| 5907 if (G1ConcRegionFreeingVerbose) { | |
| 5908 gclog_or_tty->print_cr("G1ConcRegionFreeing [cm thread] : " | |
| 5909 "setting free regions coming"); | |
| 5910 } | |
| 5911 | |
| 5912 assert(!free_regions_coming(), "pre-condition"); | |
| 5913 _free_regions_coming = true; | |
| 342 | 5914 } |
| 5915 | |
| 2152 | 5916 void G1CollectedHeap::reset_free_regions_coming() { |
|
4837
eff609af17d7
7127706: G1: re-enable survivors during the initial-mark pause
tonyp
parents:
4836
diff
changeset
|
5917 assert(free_regions_coming(), "pre-condition"); |
|
eff609af17d7
7127706: G1: re-enable survivors during the initial-mark pause
tonyp
parents:
4836
diff
changeset
|
5918 |
| 2152 | 5919 { |
| 5920 MutexLockerEx x(SecondaryFreeList_lock, Mutex::_no_safepoint_check_flag); | |
| 5921 _free_regions_coming = false; | |
| 5922 SecondaryFreeList_lock->notify_all(); | |
| 5923 } | |
| 5924 | |
| 5925 if (G1ConcRegionFreeingVerbose) { | |
| 5926 gclog_or_tty->print_cr("G1ConcRegionFreeing [cm thread] : " | |
| 5927 "reset free regions coming"); | |
| 342 | 5928 } |
| 5929 } | |
| 5930 | |
| 2152 | 5931 void G1CollectedHeap::wait_while_free_regions_coming() { |
| 5932 // Most of the time we won't have to wait, so let's do a quick test | |
| 5933 // first before we take the lock. | |
| 5934 if (!free_regions_coming()) { | |
| 5935 return; | |
| 5936 } | |
| 5937 | |
| 5938 if (G1ConcRegionFreeingVerbose) { | |
| 5939 gclog_or_tty->print_cr("G1ConcRegionFreeing [other] : " | |
| 5940 "waiting for free regions"); | |
| 342 | 5941 } |
| 5942 | |
| 5943 { | |
| 2152 | 5944 MutexLockerEx x(SecondaryFreeList_lock, Mutex::_no_safepoint_check_flag); |
| 5945 while (free_regions_coming()) { | |
| 5946 SecondaryFreeList_lock->wait(Mutex::_no_safepoint_check_flag); | |
| 342 | 5947 } |
| 2152 | 5948 } |
| 5949 | |
| 5950 if (G1ConcRegionFreeingVerbose) { | |
| 5951 gclog_or_tty->print_cr("G1ConcRegionFreeing [other] : " | |
| 5952 "done waiting for free regions"); | |
| 5953 } | |
| 342 | 5954 } |
| 5955 | |
| 5956 void G1CollectedHeap::set_region_short_lived_locked(HeapRegion* hr) { | |
| 5957 assert(heap_lock_held_for_gc(), | |
| 5958 "the heap lock should already be held by or for this thread"); | |
| 5959 _young_list->push_region(hr); | |
| 5960 } | |
| 5961 | |
| 5962 class NoYoungRegionsClosure: public HeapRegionClosure { | |
| 5963 private: | |
| 5964 bool _success; | |
| 5965 public: | |
| 5966 NoYoungRegionsClosure() : _success(true) { } | |
| 5967 bool doHeapRegion(HeapRegion* r) { | |
| 5968 if (r->is_young()) { | |
| 5969 gclog_or_tty->print_cr("Region ["PTR_FORMAT", "PTR_FORMAT") tagged as young", | |
| 5970 r->bottom(), r->end()); | |
| 5971 _success = false; | |
| 5972 } | |
| 5973 return false; | |
| 5974 } | |
| 5975 bool success() { return _success; } | |
| 5976 }; | |
| 5977 | |
|
1394
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
5978 bool G1CollectedHeap::check_young_list_empty(bool check_heap, bool check_sample) { |
|
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
5979 bool ret = _young_list->check_list_empty(check_sample); |
|
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
5980 |
|
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
5981 if (check_heap) { |
| 342 | 5982 NoYoungRegionsClosure closure; |
| 5983 heap_region_iterate(&closure); | |
| 5984 ret = ret && closure.success(); | |
| 5985 } | |
| 5986 | |
| 5987 return ret; | |
| 5988 } | |
| 5989 | |
| 4072 | 5990 class TearDownRegionSetsClosure : public HeapRegionClosure { |
| 5991 private: | |
| 5992 OldRegionSet *_old_set; | |
| 2152 | 5993 |
| 342 | 5994 public: |
| 4072 | 5995 TearDownRegionSetsClosure(OldRegionSet* old_set) : _old_set(old_set) { } |
| 2152 | 5996 |
| 342 | 5997 bool doHeapRegion(HeapRegion* r) { |
| 4072 | 5998 if (r->is_empty()) { |
| 5999 // We ignore empty regions, we'll empty the free list afterwards | |
| 6000 } else if (r->is_young()) { | |
| 6001 // We ignore young regions, we'll empty the young list afterwards | |
| 6002 } else if (r->isHumongous()) { | |
| 6003 // We ignore humongous regions, we're not tearing down the | |
| 6004 // humongous region set | |
| 342 | 6005 } else { |
| 4072 | 6006 // The rest should be old |
| 6007 _old_set->remove(r); | |
| 342 | 6008 } |
| 6009 return false; | |
| 6010 } | |
| 6011 | |
| 4072 | 6012 ~TearDownRegionSetsClosure() { |
| 6013 assert(_old_set->is_empty(), "post-condition"); | |
| 2152 | 6014 } |
| 342 | 6015 }; |
| 6016 | |
| 4072 | 6017 void G1CollectedHeap::tear_down_region_sets(bool free_list_only) { |
| 6018 assert_at_safepoint(true /* should_be_vm_thread */); | |
| 6019 | |
| 6020 if (!free_list_only) { | |
| 6021 TearDownRegionSetsClosure cl(&_old_set); | |
| 6022 heap_region_iterate(&cl); | |
| 6023 | |
| 6024 // Need to do this after the heap iteration to be able to | |
| 6025 // recognize the young regions and ignore them during the iteration. | |
| 6026 _young_list->empty_list(); | |
| 6027 } | |
| 6028 _free_list.remove_all(); | |
| 6029 } | |
| 6030 | |
| 6031 class RebuildRegionSetsClosure : public HeapRegionClosure { | |
| 6032 private: | |
| 6033 bool _free_list_only; | |
| 6034 OldRegionSet* _old_set; | |
| 6035 FreeRegionList* _free_list; | |
| 6036 size_t _total_used; | |
| 6037 | |
| 6038 public: | |
| 6039 RebuildRegionSetsClosure(bool free_list_only, | |
| 6040 OldRegionSet* old_set, FreeRegionList* free_list) : | |
| 6041 _free_list_only(free_list_only), | |
| 6042 _old_set(old_set), _free_list(free_list), _total_used(0) { | |
| 6043 assert(_free_list->is_empty(), "pre-condition"); | |
| 6044 if (!free_list_only) { | |
| 6045 assert(_old_set->is_empty(), "pre-condition"); | |
| 6046 } | |
| 6047 } | |
| 6048 | |
| 6049 bool doHeapRegion(HeapRegion* r) { | |
| 6050 if (r->continuesHumongous()) { | |
| 6051 return false; | |
| 6052 } | |
| 6053 | |
| 6054 if (r->is_empty()) { | |
| 6055 // Add free regions to the free list | |
| 6056 _free_list->add_as_tail(r); | |
| 6057 } else if (!_free_list_only) { | |
| 6058 assert(!r->is_young(), "we should not come across young regions"); | |
| 6059 | |
| 6060 if (r->isHumongous()) { | |
| 6061 // We ignore humongous regions, we left the humongous set unchanged | |
| 6062 } else { | |
| 6063 // The rest should be old, add them to the old set | |
| 6064 _old_set->add(r); | |
| 6065 } | |
| 6066 _total_used += r->used(); | |
| 6067 } | |
| 6068 | |
| 6069 return false; | |
| 6070 } | |
| 6071 | |
| 6072 size_t total_used() { | |
| 6073 return _total_used; | |
| 6074 } | |
| 6075 }; | |
| 6076 | |
| 6077 void G1CollectedHeap::rebuild_region_sets(bool free_list_only) { | |
| 6078 assert_at_safepoint(true /* should_be_vm_thread */); | |
| 6079 | |
| 6080 RebuildRegionSetsClosure cl(free_list_only, &_old_set, &_free_list); | |
| 6081 heap_region_iterate(&cl); | |
| 6082 | |
| 6083 if (!free_list_only) { | |
| 6084 _summary_bytes_used = cl.total_used(); | |
| 6085 } | |
| 6086 assert(_summary_bytes_used == recalculate_used(), | |
| 6087 err_msg("inconsistent _summary_bytes_used, " | |
| 6088 "value: "SIZE_FORMAT" recalculated: "SIZE_FORMAT, | |
| 6089 _summary_bytes_used, recalculate_used())); | |
| 342 | 6090 } |
| 6091 | |
| 6092 void G1CollectedHeap::set_refine_cte_cl_concurrency(bool concurrent) { | |
| 6093 _refine_cte_cl->set_concurrent(concurrent); | |
| 6094 } | |
| 6095 | |
| 6096 bool G1CollectedHeap::is_in_closed_subset(const void* p) const { | |
| 6097 HeapRegion* hr = heap_region_containing(p); | |
| 6098 if (hr == NULL) { | |
| 6099 return is_in_permanent(p); | |
| 6100 } else { | |
| 6101 return hr->is_in(p); | |
| 6102 } | |
| 6103 } | |
| 2152 | 6104 |
|
3830
f44782f04dd4
7039627: G1: avoid BOT updates for survivor allocations and dirty survivor regions incrementally
tonyp
parents:
3824
diff
changeset
|
6105 // Methods for the mutator alloc region |
|
f44782f04dd4
7039627: G1: avoid BOT updates for survivor allocations and dirty survivor regions incrementally
tonyp
parents:
3824
diff
changeset
|
6106 |
|
2433
abdfc822206f
7023069: G1: Introduce symmetric locking in the slow allocation path
tonyp
parents:
2432
diff
changeset
|
6107 HeapRegion* G1CollectedHeap::new_mutator_alloc_region(size_t word_size, |
|
abdfc822206f
7023069: G1: Introduce symmetric locking in the slow allocation path
tonyp
parents:
2432
diff
changeset
|
6108 bool force) { |
|
abdfc822206f
7023069: G1: Introduce symmetric locking in the slow allocation path
tonyp
parents:
2432
diff
changeset
|
6109 assert_heap_locked_or_at_safepoint(true /* should_be_vm_thread */); |
|
abdfc822206f
7023069: G1: Introduce symmetric locking in the slow allocation path
tonyp
parents:
2432
diff
changeset
|
6110 assert(!force || g1_policy()->can_expand_young_list(), |
|
abdfc822206f
7023069: G1: Introduce symmetric locking in the slow allocation path
tonyp
parents:
2432
diff
changeset
|
6111 "if force is true we should be able to expand the young list"); |
|
3778
5f6f2615433a
7049999: G1: Make the G1PrintHeapRegions output consistent and complete
tonyp
parents:
3777
diff
changeset
|
6112 bool young_list_full = g1_policy()->is_young_list_full(); |
|
5f6f2615433a
7049999: G1: Make the G1PrintHeapRegions output consistent and complete
tonyp
parents:
3777
diff
changeset
|
6113 if (force || !young_list_full) { |
|
2433
abdfc822206f
7023069: G1: Introduce symmetric locking in the slow allocation path
tonyp
parents:
2432
diff
changeset
|
6114 HeapRegion* new_alloc_region = new_region(word_size, |
|
abdfc822206f
7023069: G1: Introduce symmetric locking in the slow allocation path
tonyp
parents:
2432
diff
changeset
|
6115 false /* do_expand */); |
|
abdfc822206f
7023069: G1: Introduce symmetric locking in the slow allocation path
tonyp
parents:
2432
diff
changeset
|
6116 if (new_alloc_region != NULL) { |
|
abdfc822206f
7023069: G1: Introduce symmetric locking in the slow allocation path
tonyp
parents:
2432
diff
changeset
|
6117 set_region_short_lived_locked(new_alloc_region); |
|
3778
5f6f2615433a
7049999: G1: Make the G1PrintHeapRegions output consistent and complete
tonyp
parents:
3777
diff
changeset
|
6118 _hr_printer.alloc(new_alloc_region, G1HRPrinter::Eden, young_list_full); |
|
2433
abdfc822206f
7023069: G1: Introduce symmetric locking in the slow allocation path
tonyp
parents:
2432
diff
changeset
|
6119 return new_alloc_region; |
|
abdfc822206f
7023069: G1: Introduce symmetric locking in the slow allocation path
tonyp
parents:
2432
diff
changeset
|
6120 } |
|
abdfc822206f
7023069: G1: Introduce symmetric locking in the slow allocation path
tonyp
parents:
2432
diff
changeset
|
6121 } |
|
abdfc822206f
7023069: G1: Introduce symmetric locking in the slow allocation path
tonyp
parents:
2432
diff
changeset
|
6122 return NULL; |
|
abdfc822206f
7023069: G1: Introduce symmetric locking in the slow allocation path
tonyp
parents:
2432
diff
changeset
|
6123 } |
|
abdfc822206f
7023069: G1: Introduce symmetric locking in the slow allocation path
tonyp
parents:
2432
diff
changeset
|
6124 |
|
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7023069: G1: Introduce symmetric locking in the slow allocation path
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|
6125 void G1CollectedHeap::retire_mutator_alloc_region(HeapRegion* alloc_region, |
|
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|
6126 size_t allocated_bytes) { |
|
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|
6127 assert_heap_locked_or_at_safepoint(true /* should_be_vm_thread */); |
|
abdfc822206f
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|
6128 assert(alloc_region->is_young(), "all mutator alloc regions should be young"); |
|
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|
6129 |
|
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|
6130 g1_policy()->add_region_to_incremental_cset_lhs(alloc_region); |
|
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|
6131 _summary_bytes_used += allocated_bytes; |
|
3778
5f6f2615433a
7049999: G1: Make the G1PrintHeapRegions output consistent and complete
tonyp
parents:
3777
diff
changeset
|
6132 _hr_printer.retire(alloc_region); |
|
3980
8229bd737950
7075646: G1: fix inconsistencies in the monitoring data
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3979
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changeset
|
6133 // We update the eden sizes here, when the region is retired, |
|
8229bd737950
7075646: G1: fix inconsistencies in the monitoring data
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|
6134 // instead of when it's allocated, since this is the point that its |
|
8229bd737950
7075646: G1: fix inconsistencies in the monitoring data
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|
6135 // used space has been recored in _summary_bytes_used. |
|
8229bd737950
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|
6136 g1mm()->update_eden_size(); |
|
2433
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|
6137 } |
|
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|
6138 |
|
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|
6139 HeapRegion* MutatorAllocRegion::allocate_new_region(size_t word_size, |
|
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|
6140 bool force) { |
|
abdfc822206f
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|
6141 return _g1h->new_mutator_alloc_region(word_size, force); |
|
abdfc822206f
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|
6142 } |
|
abdfc822206f
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|
6143 |
|
4095
bca17e38de00
6593758: RFE: Enhance GC ergonomics to dynamically choose ParallelGCThreads
jmasa
parents:
4090
diff
changeset
|
6144 void G1CollectedHeap::set_par_threads() { |
|
bca17e38de00
6593758: RFE: Enhance GC ergonomics to dynamically choose ParallelGCThreads
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4090
diff
changeset
|
6145 // Don't change the number of workers. Use the value previously set |
|
bca17e38de00
6593758: RFE: Enhance GC ergonomics to dynamically choose ParallelGCThreads
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|
6146 // in the workgroup. |
| 4711 | 6147 assert(G1CollectedHeap::use_parallel_gc_threads(), "shouldn't be here otherwise"); |
|
4728
441e946dc1af
7121618: Change type of number of GC workers to unsigned int.
jmasa
parents:
4711
diff
changeset
|
6148 uint n_workers = workers()->active_workers(); |
| 4711 | 6149 assert(UseDynamicNumberOfGCThreads || |
|
4095
bca17e38de00
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|
6150 n_workers == workers()->total_workers(), |
|
bca17e38de00
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jmasa
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|
6151 "Otherwise should be using the total number of workers"); |
|
bca17e38de00
6593758: RFE: Enhance GC ergonomics to dynamically choose ParallelGCThreads
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|
6152 if (n_workers == 0) { |
|
bca17e38de00
6593758: RFE: Enhance GC ergonomics to dynamically choose ParallelGCThreads
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|
6153 assert(false, "Should have been set in prior evacuation pause."); |
|
bca17e38de00
6593758: RFE: Enhance GC ergonomics to dynamically choose ParallelGCThreads
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|
6154 n_workers = ParallelGCThreads; |
|
bca17e38de00
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|
6155 workers()->set_active_workers(n_workers); |
|
bca17e38de00
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jmasa
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|
6156 } |
|
bca17e38de00
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|
6157 set_par_threads(n_workers); |
|
bca17e38de00
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|
6158 } |
|
bca17e38de00
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parents:
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diff
changeset
|
6159 |
|
2433
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7023069: G1: Introduce symmetric locking in the slow allocation path
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|
6160 void MutatorAllocRegion::retire_region(HeapRegion* alloc_region, |
|
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|
6161 size_t allocated_bytes) { |
|
abdfc822206f
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|
6162 _g1h->retire_mutator_alloc_region(alloc_region, allocated_bytes); |
|
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|
6163 } |
|
abdfc822206f
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|
6164 |
|
3830
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7039627: G1: avoid BOT updates for survivor allocations and dirty survivor regions incrementally
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diff
changeset
|
6165 // Methods for the GC alloc regions |
|
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|
6166 |
|
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|
6167 HeapRegion* G1CollectedHeap::new_gc_alloc_region(size_t word_size, |
|
6010
720b6a76dd9d
7157073: G1: type change size_t -> uint for region counts / indexes
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6008
diff
changeset
|
6168 uint count, |
|
3830
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|
6169 GCAllocPurpose ap) { |
|
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|
6170 assert(FreeList_lock->owned_by_self(), "pre-condition"); |
|
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|
6171 |
|
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|
6172 if (count < g1_policy()->max_regions(ap)) { |
|
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|
6173 HeapRegion* new_alloc_region = new_region(word_size, |
|
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|
6174 true /* do_expand */); |
|
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|
6175 if (new_alloc_region != NULL) { |
|
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|
6176 // We really only need to do this for old regions given that we |
|
f44782f04dd4
7039627: G1: avoid BOT updates for survivor allocations and dirty survivor regions incrementally
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|
6177 // should never scan survivors. But it doesn't hurt to do it |
|
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|
6178 // for survivors too. |
|
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|
6179 new_alloc_region->set_saved_mark(); |
|
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|
6180 if (ap == GCAllocForSurvived) { |
|
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|
6181 new_alloc_region->set_survivor(); |
|
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|
6182 _hr_printer.alloc(new_alloc_region, G1HRPrinter::Survivor); |
|
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|
6183 } else { |
|
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7039627: G1: avoid BOT updates for survivor allocations and dirty survivor regions incrementally
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|
6184 _hr_printer.alloc(new_alloc_region, G1HRPrinter::Old); |
|
f44782f04dd4
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diff
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|
6185 } |
|
4787
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
4785
diff
changeset
|
6186 bool during_im = g1_policy()->during_initial_mark_pause(); |
|
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
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changeset
|
6187 new_alloc_region->note_start_of_copying(during_im); |
|
3830
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7039627: G1: avoid BOT updates for survivor allocations and dirty survivor regions incrementally
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|
6188 return new_alloc_region; |
|
f44782f04dd4
7039627: G1: avoid BOT updates for survivor allocations and dirty survivor regions incrementally
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diff
changeset
|
6189 } else { |
|
f44782f04dd4
7039627: G1: avoid BOT updates for survivor allocations and dirty survivor regions incrementally
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diff
changeset
|
6190 g1_policy()->note_alloc_region_limit_reached(ap); |
|
f44782f04dd4
7039627: G1: avoid BOT updates for survivor allocations and dirty survivor regions incrementally
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diff
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|
6191 } |
|
f44782f04dd4
7039627: G1: avoid BOT updates for survivor allocations and dirty survivor regions incrementally
tonyp
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diff
changeset
|
6192 } |
|
f44782f04dd4
7039627: G1: avoid BOT updates for survivor allocations and dirty survivor regions incrementally
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diff
changeset
|
6193 return NULL; |
|
f44782f04dd4
7039627: G1: avoid BOT updates for survivor allocations and dirty survivor regions incrementally
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diff
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|
6194 } |
|
f44782f04dd4
7039627: G1: avoid BOT updates for survivor allocations and dirty survivor regions incrementally
tonyp
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3824
diff
changeset
|
6195 |
|
f44782f04dd4
7039627: G1: avoid BOT updates for survivor allocations and dirty survivor regions incrementally
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diff
changeset
|
6196 void G1CollectedHeap::retire_gc_alloc_region(HeapRegion* alloc_region, |
|
f44782f04dd4
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|
6197 size_t allocated_bytes, |
|
f44782f04dd4
7039627: G1: avoid BOT updates for survivor allocations and dirty survivor regions incrementally
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diff
changeset
|
6198 GCAllocPurpose ap) { |
|
4787
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
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4785
diff
changeset
|
6199 bool during_im = g1_policy()->during_initial_mark_pause(); |
|
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
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4785
diff
changeset
|
6200 alloc_region->note_end_of_copying(during_im); |
|
3830
f44782f04dd4
7039627: G1: avoid BOT updates for survivor allocations and dirty survivor regions incrementally
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diff
changeset
|
6201 g1_policy()->record_bytes_copied_during_gc(allocated_bytes); |
|
f44782f04dd4
7039627: G1: avoid BOT updates for survivor allocations and dirty survivor regions incrementally
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diff
changeset
|
6202 if (ap == GCAllocForSurvived) { |
|
f44782f04dd4
7039627: G1: avoid BOT updates for survivor allocations and dirty survivor regions incrementally
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parents:
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diff
changeset
|
6203 young_list()->add_survivor_region(alloc_region); |
| 4072 | 6204 } else { |
| 6205 _old_set.add(alloc_region); | |
|
3830
f44782f04dd4
7039627: G1: avoid BOT updates for survivor allocations and dirty survivor regions incrementally
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diff
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|
6206 } |
|
f44782f04dd4
7039627: G1: avoid BOT updates for survivor allocations and dirty survivor regions incrementally
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diff
changeset
|
6207 _hr_printer.retire(alloc_region); |
|
f44782f04dd4
7039627: G1: avoid BOT updates for survivor allocations and dirty survivor regions incrementally
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diff
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|
6208 } |
|
f44782f04dd4
7039627: G1: avoid BOT updates for survivor allocations and dirty survivor regions incrementally
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3824
diff
changeset
|
6209 |
|
f44782f04dd4
7039627: G1: avoid BOT updates for survivor allocations and dirty survivor regions incrementally
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3824
diff
changeset
|
6210 HeapRegion* SurvivorGCAllocRegion::allocate_new_region(size_t word_size, |
|
f44782f04dd4
7039627: G1: avoid BOT updates for survivor allocations and dirty survivor regions incrementally
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diff
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|
6211 bool force) { |
|
f44782f04dd4
7039627: G1: avoid BOT updates for survivor allocations and dirty survivor regions incrementally
tonyp
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diff
changeset
|
6212 assert(!force, "not supported for GC alloc regions"); |
|
f44782f04dd4
7039627: G1: avoid BOT updates for survivor allocations and dirty survivor regions incrementally
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|
6213 return _g1h->new_gc_alloc_region(word_size, count(), GCAllocForSurvived); |
|
f44782f04dd4
7039627: G1: avoid BOT updates for survivor allocations and dirty survivor regions incrementally
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|
6214 } |
|
f44782f04dd4
7039627: G1: avoid BOT updates for survivor allocations and dirty survivor regions incrementally
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changeset
|
6215 |
|
f44782f04dd4
7039627: G1: avoid BOT updates for survivor allocations and dirty survivor regions incrementally
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changeset
|
6216 void SurvivorGCAllocRegion::retire_region(HeapRegion* alloc_region, |
|
f44782f04dd4
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|
6217 size_t allocated_bytes) { |
|
f44782f04dd4
7039627: G1: avoid BOT updates for survivor allocations and dirty survivor regions incrementally
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|
6218 _g1h->retire_gc_alloc_region(alloc_region, allocated_bytes, |
|
f44782f04dd4
7039627: G1: avoid BOT updates for survivor allocations and dirty survivor regions incrementally
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|
6219 GCAllocForSurvived); |
|
f44782f04dd4
7039627: G1: avoid BOT updates for survivor allocations and dirty survivor regions incrementally
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diff
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|
6220 } |
|
f44782f04dd4
7039627: G1: avoid BOT updates for survivor allocations and dirty survivor regions incrementally
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3824
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changeset
|
6221 |
|
f44782f04dd4
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3824
diff
changeset
|
6222 HeapRegion* OldGCAllocRegion::allocate_new_region(size_t word_size, |
|
f44782f04dd4
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|
6223 bool force) { |
|
f44782f04dd4
7039627: G1: avoid BOT updates for survivor allocations and dirty survivor regions incrementally
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diff
changeset
|
6224 assert(!force, "not supported for GC alloc regions"); |
|
f44782f04dd4
7039627: G1: avoid BOT updates for survivor allocations and dirty survivor regions incrementally
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diff
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|
6225 return _g1h->new_gc_alloc_region(word_size, count(), GCAllocForTenured); |
|
f44782f04dd4
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|
6226 } |
|
f44782f04dd4
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3824
diff
changeset
|
6227 |
|
f44782f04dd4
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diff
changeset
|
6228 void OldGCAllocRegion::retire_region(HeapRegion* alloc_region, |
|
f44782f04dd4
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|
6229 size_t allocated_bytes) { |
|
f44782f04dd4
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changeset
|
6230 _g1h->retire_gc_alloc_region(alloc_region, allocated_bytes, |
|
f44782f04dd4
7039627: G1: avoid BOT updates for survivor allocations and dirty survivor regions incrementally
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|
6231 GCAllocForTenured); |
|
f44782f04dd4
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diff
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|
6232 } |
|
2433
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diff
changeset
|
6233 // Heap region set verification |
|
abdfc822206f
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changeset
|
6234 |
| 2152 | 6235 class VerifyRegionListsClosure : public HeapRegionClosure { |
| 6236 private: | |
| 4072 | 6237 FreeRegionList* _free_list; |
| 6238 OldRegionSet* _old_set; | |
| 2152 | 6239 HumongousRegionSet* _humongous_set; |
|
6010
720b6a76dd9d
7157073: G1: type change size_t -> uint for region counts / indexes
tonyp
parents:
6008
diff
changeset
|
6240 uint _region_count; |
| 2152 | 6241 |
| 6242 public: | |
| 4072 | 6243 VerifyRegionListsClosure(OldRegionSet* old_set, |
| 6244 HumongousRegionSet* humongous_set, | |
| 2152 | 6245 FreeRegionList* free_list) : |
| 4072 | 6246 _old_set(old_set), _humongous_set(humongous_set), |
| 6247 _free_list(free_list), _region_count(0) { } | |
| 2152 | 6248 |
|
6010
720b6a76dd9d
7157073: G1: type change size_t -> uint for region counts / indexes
tonyp
parents:
6008
diff
changeset
|
6249 uint region_count() { return _region_count; } |
| 2152 | 6250 |
| 6251 bool doHeapRegion(HeapRegion* hr) { | |
| 6252 _region_count += 1; | |
| 6253 | |
| 6254 if (hr->continuesHumongous()) { | |
| 6255 return false; | |
| 6256 } | |
| 6257 | |
| 6258 if (hr->is_young()) { | |
| 6259 // TODO | |
| 6260 } else if (hr->startsHumongous()) { | |
| 6261 _humongous_set->verify_next_region(hr); | |
| 6262 } else if (hr->is_empty()) { | |
| 6263 _free_list->verify_next_region(hr); | |
| 4072 | 6264 } else { |
| 6265 _old_set->verify_next_region(hr); | |
| 2152 | 6266 } |
| 6267 return false; | |
| 6268 } | |
| 6269 }; | |
| 6270 | |
|
6010
720b6a76dd9d
7157073: G1: type change size_t -> uint for region counts / indexes
tonyp
parents:
6008
diff
changeset
|
6271 HeapRegion* G1CollectedHeap::new_heap_region(uint hrs_index, |
| 3766 | 6272 HeapWord* bottom) { |
| 6273 HeapWord* end = bottom + HeapRegion::GrainWords; | |
| 6274 MemRegion mr(bottom, end); | |
| 6275 assert(_g1_reserved.contains(mr), "invariant"); | |
| 6276 // This might return NULL if the allocation fails | |
| 6277 return new HeapRegion(hrs_index, _bot_shared, mr, true /* is_zeroed */); | |
| 6278 } | |
| 6279 | |
| 2152 | 6280 void G1CollectedHeap::verify_region_sets() { |
| 6281 assert_heap_locked_or_at_safepoint(true /* should_be_vm_thread */); | |
| 6282 | |
| 6283 // First, check the explicit lists. | |
| 6284 _free_list.verify(); | |
| 6285 { | |
| 6286 // Given that a concurrent operation might be adding regions to | |
| 6287 // the secondary free list we have to take the lock before | |
| 6288 // verifying it. | |
| 6289 MutexLockerEx x(SecondaryFreeList_lock, Mutex::_no_safepoint_check_flag); | |
| 6290 _secondary_free_list.verify(); | |
| 6291 } | |
| 4072 | 6292 _old_set.verify(); |
| 2152 | 6293 _humongous_set.verify(); |
| 6294 | |
| 6295 // If a concurrent region freeing operation is in progress it will | |
| 6296 // be difficult to correctly attributed any free regions we come | |
| 6297 // across to the correct free list given that they might belong to | |
| 6298 // one of several (free_list, secondary_free_list, any local lists, | |
| 6299 // etc.). So, if that's the case we will skip the rest of the | |
| 6300 // verification operation. Alternatively, waiting for the concurrent | |
| 6301 // operation to complete will have a non-trivial effect on the GC's | |
| 6302 // operation (no concurrent operation will last longer than the | |
| 6303 // interval between two calls to verification) and it might hide | |
| 6304 // any issues that we would like to catch during testing. | |
| 6305 if (free_regions_coming()) { | |
| 6306 return; | |
| 6307 } | |
| 6308 | |
| 2361 | 6309 // Make sure we append the secondary_free_list on the free_list so |
| 6310 // that all free regions we will come across can be safely | |
| 6311 // attributed to the free_list. | |
| 6312 append_secondary_free_list_if_not_empty_with_lock(); | |
| 2152 | 6313 |
| 6314 // Finally, make sure that the region accounting in the lists is | |
| 6315 // consistent with what we see in the heap. | |
| 4072 | 6316 _old_set.verify_start(); |
| 2152 | 6317 _humongous_set.verify_start(); |
| 6318 _free_list.verify_start(); | |
| 6319 | |
| 4072 | 6320 VerifyRegionListsClosure cl(&_old_set, &_humongous_set, &_free_list); |
| 2152 | 6321 heap_region_iterate(&cl); |
| 6322 | |
| 4072 | 6323 _old_set.verify_end(); |
| 2152 | 6324 _humongous_set.verify_end(); |
| 6325 _free_list.verify_end(); | |
| 342 | 6326 } |