Mercurial > hg > truffle
annotate src/share/vm/gc_implementation/g1/g1CollectedHeap.hpp @ 12355:cefad50507d8
Merge with hs25-b53
| author | Gilles Duboscq <duboscq@ssw.jku.at> |
|---|---|
| date | Fri, 11 Oct 2013 10:38:03 +0200 |
| parents | 6b0fd0964b87 798522662fcd |
| children | 359f7e70ae7f |
| rev | line source |
|---|---|
| 342 | 1 /* |
| 10405 | 2 * Copyright (c) 2001, 2013, 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 #ifndef SHARE_VM_GC_IMPLEMENTATION_G1_G1COLLECTEDHEAP_HPP |
| 26 #define SHARE_VM_GC_IMPLEMENTATION_G1_G1COLLECTEDHEAP_HPP | |
| 27 | |
| 28 #include "gc_implementation/g1/concurrentMark.hpp" | |
| 10405 | 29 #include "gc_implementation/g1/evacuationInfo.hpp" |
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30 #include "gc_implementation/g1/g1AllocRegion.hpp" |
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31 #include "gc_implementation/g1/g1HRPrinter.hpp" |
| 10405 | 32 #include "gc_implementation/g1/g1MonitoringSupport.hpp" |
| 1972 | 33 #include "gc_implementation/g1/g1RemSet.hpp" |
| 12343 | 34 #include "gc_implementation/g1/g1SATBCardTableModRefBS.hpp" |
| 10405 | 35 #include "gc_implementation/g1/g1YCTypes.hpp" |
| 3766 | 36 #include "gc_implementation/g1/heapRegionSeq.hpp" |
| 2152 | 37 #include "gc_implementation/g1/heapRegionSets.hpp" |
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38 #include "gc_implementation/shared/hSpaceCounters.hpp" |
| 6595 | 39 #include "gc_implementation/shared/parGCAllocBuffer.hpp" |
| 1972 | 40 #include "memory/barrierSet.hpp" |
| 41 #include "memory/memRegion.hpp" | |
| 42 #include "memory/sharedHeap.hpp" | |
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43 #include "utilities/stack.hpp" |
| 1972 | 44 |
| 342 | 45 // A "G1CollectedHeap" is an implementation of a java heap for HotSpot. |
| 46 // It uses the "Garbage First" heap organization and algorithm, which | |
| 47 // may combine concurrent marking with parallel, incremental compaction of | |
| 48 // heap subsets that will yield large amounts of garbage. | |
| 49 | |
| 12080 | 50 // Forward declarations |
| 342 | 51 class HeapRegion; |
| 2173 | 52 class HRRSCleanupTask; |
| 342 | 53 class GenerationSpec; |
| 54 class OopsInHeapRegionClosure; | |
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55 class G1KlassScanClosure; |
| 342 | 56 class G1ScanHeapEvacClosure; |
| 57 class ObjectClosure; | |
| 58 class SpaceClosure; | |
| 59 class CompactibleSpaceClosure; | |
| 60 class Space; | |
| 61 class G1CollectorPolicy; | |
| 62 class GenRemSet; | |
| 63 class G1RemSet; | |
| 64 class HeapRegionRemSetIterator; | |
| 65 class ConcurrentMark; | |
| 66 class ConcurrentMarkThread; | |
| 67 class ConcurrentG1Refine; | |
| 10405 | 68 class ConcurrentGCTimer; |
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69 class GenerationCounters; |
| 10405 | 70 class STWGCTimer; |
| 71 class G1NewTracer; | |
| 72 class G1OldTracer; | |
| 73 class EvacuationFailedInfo; | |
| 12080 | 74 class nmethod; |
| 342 | 75 |
| 6197 | 76 typedef OverflowTaskQueue<StarTask, mtGC> RefToScanQueue; |
| 77 typedef GenericTaskQueueSet<RefToScanQueue, mtGC> RefToScanQueueSet; | |
| 342 | 78 |
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79 typedef int RegionIdx_t; // needs to hold [ 0..max_regions() ) |
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80 typedef int CardIdx_t; // needs to hold [ 0..CardsPerRegion ) |
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81 |
| 342 | 82 enum GCAllocPurpose { |
| 83 GCAllocForTenured, | |
| 84 GCAllocForSurvived, | |
| 85 GCAllocPurposeCount | |
| 86 }; | |
| 87 | |
| 6197 | 88 class YoungList : public CHeapObj<mtGC> { |
| 342 | 89 private: |
| 90 G1CollectedHeap* _g1h; | |
| 91 | |
| 92 HeapRegion* _head; | |
| 93 | |
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94 HeapRegion* _survivor_head; |
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95 HeapRegion* _survivor_tail; |
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96 |
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97 HeapRegion* _curr; |
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98 |
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99 uint _length; |
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100 uint _survivor_length; |
| 342 | 101 |
| 102 size_t _last_sampled_rs_lengths; | |
| 103 size_t _sampled_rs_lengths; | |
| 104 | |
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105 void empty_list(HeapRegion* list); |
| 342 | 106 |
| 107 public: | |
| 108 YoungList(G1CollectedHeap* g1h); | |
| 109 | |
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110 void push_region(HeapRegion* hr); |
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111 void add_survivor_region(HeapRegion* hr); |
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112 |
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113 void empty_list(); |
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114 bool is_empty() { return _length == 0; } |
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115 uint length() { return _length; } |
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116 uint survivor_length() { return _survivor_length; } |
| 342 | 117 |
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118 // Currently we do not keep track of the used byte sum for the |
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119 // young list and the survivors and it'd be quite a lot of work to |
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120 // do so. When we'll eventually replace the young list with |
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121 // instances of HeapRegionLinkedList we'll get that for free. So, |
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122 // we'll report the more accurate information then. |
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123 size_t eden_used_bytes() { |
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124 assert(length() >= survivor_length(), "invariant"); |
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125 return (size_t) (length() - survivor_length()) * HeapRegion::GrainBytes; |
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126 } |
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127 size_t survivor_used_bytes() { |
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128 return (size_t) survivor_length() * HeapRegion::GrainBytes; |
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129 } |
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130 |
| 342 | 131 void rs_length_sampling_init(); |
| 132 bool rs_length_sampling_more(); | |
| 133 void rs_length_sampling_next(); | |
| 134 | |
| 135 void reset_sampled_info() { | |
| 136 _last_sampled_rs_lengths = 0; | |
| 137 } | |
| 138 size_t sampled_rs_lengths() { return _last_sampled_rs_lengths; } | |
| 139 | |
| 140 // for development purposes | |
| 141 void reset_auxilary_lists(); | |
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142 void clear() { _head = NULL; _length = 0; } |
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143 |
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144 void clear_survivors() { |
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145 _survivor_head = NULL; |
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146 _survivor_tail = NULL; |
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147 _survivor_length = 0; |
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148 } |
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149 |
| 342 | 150 HeapRegion* first_region() { return _head; } |
| 151 HeapRegion* first_survivor_region() { return _survivor_head; } | |
| 545 | 152 HeapRegion* last_survivor_region() { return _survivor_tail; } |
| 342 | 153 |
| 154 // debugging | |
| 155 bool check_list_well_formed(); | |
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156 bool check_list_empty(bool check_sample = true); |
| 342 | 157 void print(); |
| 158 }; | |
| 159 | |
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160 class MutatorAllocRegion : public G1AllocRegion { |
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161 protected: |
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162 virtual HeapRegion* allocate_new_region(size_t word_size, bool force); |
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163 virtual void retire_region(HeapRegion* alloc_region, size_t allocated_bytes); |
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164 public: |
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165 MutatorAllocRegion() |
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166 : G1AllocRegion("Mutator Alloc Region", false /* bot_updates */) { } |
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167 }; |
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168 |
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169 class SurvivorGCAllocRegion : public G1AllocRegion { |
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170 protected: |
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171 virtual HeapRegion* allocate_new_region(size_t word_size, bool force); |
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172 virtual void retire_region(HeapRegion* alloc_region, size_t allocated_bytes); |
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173 public: |
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174 SurvivorGCAllocRegion() |
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175 : G1AllocRegion("Survivor GC Alloc Region", false /* bot_updates */) { } |
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176 }; |
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177 |
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178 class OldGCAllocRegion : public G1AllocRegion { |
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179 protected: |
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180 virtual HeapRegion* allocate_new_region(size_t word_size, bool force); |
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181 virtual void retire_region(HeapRegion* alloc_region, size_t allocated_bytes); |
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182 public: |
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183 OldGCAllocRegion() |
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184 : G1AllocRegion("Old GC Alloc Region", true /* bot_updates */) { } |
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185 }; |
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186 |
| 12080 | 187 // The G1 STW is alive closure. |
| 188 // An instance is embedded into the G1CH and used as the | |
| 189 // (optional) _is_alive_non_header closure in the STW | |
| 190 // reference processor. It is also extensively used during | |
| 191 // reference processing during STW evacuation pauses. | |
| 192 class G1STWIsAliveClosure: public BoolObjectClosure { | |
| 193 G1CollectedHeap* _g1; | |
| 194 public: | |
| 195 G1STWIsAliveClosure(G1CollectedHeap* g1) : _g1(g1) {} | |
| 196 bool do_object_b(oop p); | |
| 197 }; | |
| 198 | |
| 342 | 199 class RefineCardTableEntryClosure; |
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200 |
| 342 | 201 class G1CollectedHeap : public SharedHeap { |
| 202 friend class VM_G1CollectForAllocation; | |
| 203 friend class VM_G1CollectFull; | |
| 204 friend class VM_G1IncCollectionPause; | |
| 205 friend class VMStructs; | |
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206 friend class MutatorAllocRegion; |
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207 friend class SurvivorGCAllocRegion; |
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208 friend class OldGCAllocRegion; |
| 342 | 209 |
| 210 // Closures used in implementation. | |
| 5987 | 211 template <bool do_gen_barrier, G1Barrier barrier, bool do_mark_object> |
| 212 friend class G1ParCopyClosure; | |
| 342 | 213 friend class G1IsAliveClosure; |
| 214 friend class G1EvacuateFollowersClosure; | |
| 215 friend class G1ParScanThreadState; | |
| 216 friend class G1ParScanClosureSuper; | |
| 217 friend class G1ParEvacuateFollowersClosure; | |
| 218 friend class G1ParTask; | |
| 219 friend class G1FreeGarbageRegionClosure; | |
| 220 friend class RefineCardTableEntryClosure; | |
| 221 friend class G1PrepareCompactClosure; | |
| 222 friend class RegionSorter; | |
| 2152 | 223 friend class RegionResetter; |
| 342 | 224 friend class CountRCClosure; |
| 225 friend class EvacPopObjClosure; | |
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226 friend class G1ParCleanupCTTask; |
| 342 | 227 |
| 228 // Other related classes. | |
| 229 friend class G1MarkSweep; | |
| 230 | |
| 231 private: | |
| 232 // The one and only G1CollectedHeap, so static functions can find it. | |
| 233 static G1CollectedHeap* _g1h; | |
| 234 | |
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235 static size_t _humongous_object_threshold_in_words; |
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236 |
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237 // Storage for the G1 heap. |
| 342 | 238 VirtualSpace _g1_storage; |
| 239 MemRegion _g1_reserved; | |
| 240 | |
| 241 // The part of _g1_storage that is currently committed. | |
| 242 MemRegion _g1_committed; | |
| 243 | |
| 2152 | 244 // The master free list. It will satisfy all new region allocations. |
| 245 MasterFreeRegionList _free_list; | |
| 246 | |
| 247 // The secondary free list which contains regions that have been | |
| 248 // freed up during the cleanup process. This will be appended to the | |
| 249 // master free list when appropriate. | |
| 250 SecondaryFreeRegionList _secondary_free_list; | |
| 251 | |
| 4072 | 252 // It keeps track of the old regions. |
| 253 MasterOldRegionSet _old_set; | |
| 254 | |
| 2152 | 255 // It keeps track of the humongous regions. |
| 256 MasterHumongousRegionSet _humongous_set; | |
| 342 | 257 |
| 258 // The number of regions we could create by expansion. | |
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259 uint _expansion_regions; |
| 342 | 260 |
| 261 // The block offset table for the G1 heap. | |
| 262 G1BlockOffsetSharedArray* _bot_shared; | |
| 263 | |
| 4072 | 264 // Tears down the region sets / lists so that they are empty and the |
| 265 // regions on the heap do not belong to a region set / list. The | |
| 266 // only exception is the humongous set which we leave unaltered. If | |
| 267 // free_list_only is true, it will only tear down the master free | |
| 268 // list. It is called before a Full GC (free_list_only == false) or | |
| 269 // before heap shrinking (free_list_only == true). | |
| 270 void tear_down_region_sets(bool free_list_only); | |
| 271 | |
| 272 // Rebuilds the region sets / lists so that they are repopulated to | |
| 273 // reflect the contents of the heap. The only exception is the | |
| 274 // humongous set which was not torn down in the first place. If | |
| 275 // free_list_only is true, it will only rebuild the master free | |
| 276 // list. It is called after a Full GC (free_list_only == false) or | |
| 277 // after heap shrinking (free_list_only == true). | |
| 278 void rebuild_region_sets(bool free_list_only); | |
| 342 | 279 |
| 280 // The sequence of all heap regions in the heap. | |
| 3766 | 281 HeapRegionSeq _hrs; |
| 342 | 282 |
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283 // Alloc region used to satisfy mutator allocation requests. |
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284 MutatorAllocRegion _mutator_alloc_region; |
| 342 | 285 |
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286 // Alloc region used to satisfy allocation requests by the GC for |
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287 // survivor objects. |
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288 SurvivorGCAllocRegion _survivor_gc_alloc_region; |
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289 |
| 6595 | 290 // PLAB sizing policy for survivors. |
| 291 PLABStats _survivor_plab_stats; | |
| 292 | |
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293 // Alloc region used to satisfy allocation requests by the GC for |
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294 // old objects. |
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295 OldGCAllocRegion _old_gc_alloc_region; |
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296 |
| 6595 | 297 // PLAB sizing policy for tenured objects. |
| 298 PLABStats _old_plab_stats; | |
| 299 | |
| 300 PLABStats* stats_for_purpose(GCAllocPurpose purpose) { | |
| 301 PLABStats* stats = NULL; | |
| 302 | |
| 303 switch (purpose) { | |
| 304 case GCAllocForSurvived: | |
| 305 stats = &_survivor_plab_stats; | |
| 306 break; | |
| 307 case GCAllocForTenured: | |
| 308 stats = &_old_plab_stats; | |
| 309 break; | |
| 310 default: | |
| 311 assert(false, "unrecognized GCAllocPurpose"); | |
| 312 } | |
| 313 | |
| 314 return stats; | |
| 315 } | |
| 316 | |
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317 // The last old region we allocated to during the last GC. |
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318 // Typically, it is not full so we should re-use it during the next GC. |
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319 HeapRegion* _retained_old_gc_alloc_region; |
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320 |
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321 // It specifies whether we should attempt to expand the heap after a |
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322 // region allocation failure. If heap expansion fails we set this to |
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323 // false so that we don't re-attempt the heap expansion (it's likely |
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324 // that subsequent expansion attempts will also fail if one fails). |
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325 // Currently, it is only consulted during GC and it's reset at the |
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326 // start of each GC. |
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327 bool _expand_heap_after_alloc_failure; |
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328 |
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329 // It resets the mutator alloc region before new allocations can take place. |
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330 void init_mutator_alloc_region(); |
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331 |
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332 // It releases the mutator alloc region. |
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333 void release_mutator_alloc_region(); |
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334 |
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335 // It initializes the GC alloc regions at the start of a GC. |
| 10405 | 336 void init_gc_alloc_regions(EvacuationInfo& evacuation_info); |
| 342 | 337 |
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338 // It releases the GC alloc regions at the end of a GC. |
| 10405 | 339 void release_gc_alloc_regions(uint no_of_gc_workers, EvacuationInfo& evacuation_info); |
| 342 | 340 |
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341 // It does any cleanup that needs to be done on the GC alloc regions |
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342 // before a Full GC. |
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343 void abandon_gc_alloc_regions(); |
| 342 | 344 |
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345 // Helper for monitoring and management support. |
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346 G1MonitoringSupport* _g1mm; |
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347 |
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348 // Determines PLAB size for a particular allocation purpose. |
| 6595 | 349 size_t desired_plab_sz(GCAllocPurpose purpose); |
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350 |
| 342 | 351 // Outside of GC pauses, the number of bytes used in all regions other |
| 352 // than the current allocation region. | |
| 353 size_t _summary_bytes_used; | |
| 354 | |
| 526 | 355 // This is used for a quick test on whether a reference points into |
| 356 // the collection set or not. Basically, we have an array, with one | |
| 357 // byte per region, and that byte denotes whether the corresponding | |
| 358 // region is in the collection set or not. The entry corresponding | |
| 359 // the bottom of the heap, i.e., region 0, is pointed to by | |
| 360 // _in_cset_fast_test_base. The _in_cset_fast_test field has been | |
| 361 // biased so that it actually points to address 0 of the address | |
| 362 // space, to make the test as fast as possible (we can simply shift | |
| 363 // the address to address into it, instead of having to subtract the | |
| 364 // bottom of the heap from the address before shifting it; basically | |
| 365 // it works in the same way the card table works). | |
| 366 bool* _in_cset_fast_test; | |
| 367 | |
| 368 // The allocated array used for the fast test on whether a reference | |
| 369 // points into the collection set or not. This field is also used to | |
| 370 // free the array. | |
| 371 bool* _in_cset_fast_test_base; | |
| 372 | |
| 373 // The length of the _in_cset_fast_test_base array. | |
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374 uint _in_cset_fast_test_length; |
| 526 | 375 |
|
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376 volatile unsigned _gc_time_stamp; |
| 342 | 377 |
| 378 size_t* _surviving_young_words; | |
| 379 | |
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380 G1HRPrinter _hr_printer; |
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381 |
| 342 | 382 void setup_surviving_young_words(); |
| 383 void update_surviving_young_words(size_t* surv_young_words); | |
| 384 void cleanup_surviving_young_words(); | |
| 385 | |
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386 // It decides whether an explicit GC should start a concurrent cycle |
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387 // instead of doing a STW GC. Currently, a concurrent cycle is |
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388 // explicitly started if: |
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389 // (a) cause == _gc_locker and +GCLockerInvokesConcurrent, or |
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390 // (b) cause == _java_lang_system_gc and +ExplicitGCInvokesConcurrent. |
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391 // (c) cause == _g1_humongous_allocation |
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392 bool should_do_concurrent_full_gc(GCCause::Cause cause); |
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393 |
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394 // Keeps track of how many "old marking cycles" (i.e., Full GCs or |
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395 // concurrent cycles) we have started. |
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396 volatile unsigned int _old_marking_cycles_started; |
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397 |
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398 // Keeps track of how many "old marking cycles" (i.e., Full GCs or |
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399 // concurrent cycles) we have completed. |
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400 volatile unsigned int _old_marking_cycles_completed; |
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401 |
| 10405 | 402 bool _concurrent_cycle_started; |
| 403 | |
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404 // This is a non-product method that is helpful for testing. It is |
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405 // called at the end of a GC and artificially expands the heap by |
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406 // allocating a number of dead regions. This way we can induce very |
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407 // frequent marking cycles and stress the cleanup / concurrent |
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408 // cleanup code more (as all the regions that will be allocated by |
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409 // this method will be found dead by the marking cycle). |
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410 void allocate_dummy_regions() PRODUCT_RETURN; |
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411 |
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412 // Clear RSets after a compaction. It also resets the GC time stamps. |
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413 void clear_rsets_post_compaction(); |
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414 |
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415 // If the HR printer is active, dump the state of the regions in the |
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416 // heap after a compaction. |
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417 void print_hrs_post_compaction(); |
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418 |
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419 double verify(bool guard, const char* msg); |
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420 void verify_before_gc(); |
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421 void verify_after_gc(); |
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422 |
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423 void log_gc_header(); |
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424 void log_gc_footer(double pause_time_sec); |
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425 |
| 1973 | 426 // These are macros so that, if the assert fires, we get the correct |
| 427 // line number, file, etc. | |
| 428 | |
| 2361 | 429 #define heap_locking_asserts_err_msg(_extra_message_) \ |
| 2152 | 430 err_msg("%s : Heap_lock locked: %s, at safepoint: %s, is VM thread: %s", \ |
| 2361 | 431 (_extra_message_), \ |
| 2152 | 432 BOOL_TO_STR(Heap_lock->owned_by_self()), \ |
| 433 BOOL_TO_STR(SafepointSynchronize::is_at_safepoint()), \ | |
| 434 BOOL_TO_STR(Thread::current()->is_VM_thread())) | |
| 1973 | 435 |
| 436 #define assert_heap_locked() \ | |
| 437 do { \ | |
| 438 assert(Heap_lock->owned_by_self(), \ | |
| 439 heap_locking_asserts_err_msg("should be holding the Heap_lock")); \ | |
| 440 } while (0) | |
| 441 | |
| 2361 | 442 #define assert_heap_locked_or_at_safepoint(_should_be_vm_thread_) \ |
| 1973 | 443 do { \ |
| 444 assert(Heap_lock->owned_by_self() || \ | |
| 2152 | 445 (SafepointSynchronize::is_at_safepoint() && \ |
| 2361 | 446 ((_should_be_vm_thread_) == Thread::current()->is_VM_thread())), \ |
| 1973 | 447 heap_locking_asserts_err_msg("should be holding the Heap_lock or " \ |
| 448 "should be at a safepoint")); \ | |
| 449 } while (0) | |
| 450 | |
| 451 #define assert_heap_locked_and_not_at_safepoint() \ | |
| 452 do { \ | |
| 453 assert(Heap_lock->owned_by_self() && \ | |
| 454 !SafepointSynchronize::is_at_safepoint(), \ | |
| 455 heap_locking_asserts_err_msg("should be holding the Heap_lock and " \ | |
| 456 "should not be at a safepoint")); \ | |
| 457 } while (0) | |
| 458 | |
| 459 #define assert_heap_not_locked() \ | |
| 460 do { \ | |
| 461 assert(!Heap_lock->owned_by_self(), \ | |
| 462 heap_locking_asserts_err_msg("should not be holding the Heap_lock")); \ | |
| 463 } while (0) | |
| 464 | |
| 465 #define assert_heap_not_locked_and_not_at_safepoint() \ | |
| 466 do { \ | |
| 467 assert(!Heap_lock->owned_by_self() && \ | |
| 468 !SafepointSynchronize::is_at_safepoint(), \ | |
| 469 heap_locking_asserts_err_msg("should not be holding the Heap_lock and " \ | |
| 470 "should not be at a safepoint")); \ | |
| 471 } while (0) | |
| 472 | |
| 2361 | 473 #define assert_at_safepoint(_should_be_vm_thread_) \ |
| 1973 | 474 do { \ |
| 2152 | 475 assert(SafepointSynchronize::is_at_safepoint() && \ |
| 2361 | 476 ((_should_be_vm_thread_) == Thread::current()->is_VM_thread()), \ |
| 1973 | 477 heap_locking_asserts_err_msg("should be at a safepoint")); \ |
| 478 } while (0) | |
| 479 | |
| 480 #define assert_not_at_safepoint() \ | |
| 481 do { \ | |
| 482 assert(!SafepointSynchronize::is_at_safepoint(), \ | |
| 483 heap_locking_asserts_err_msg("should not be at a safepoint")); \ | |
| 484 } while (0) | |
| 485 | |
| 342 | 486 protected: |
| 487 | |
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488 // The young region list. |
| 342 | 489 YoungList* _young_list; |
| 490 | |
| 491 // The current policy object for the collector. | |
| 492 G1CollectorPolicy* _g1_policy; | |
| 493 | |
| 2152 | 494 // This is the second level of trying to allocate a new region. If |
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495 // new_region() didn't find a region on the free_list, this call will |
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496 // check whether there's anything available on the |
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497 // secondary_free_list and/or wait for more regions to appear on |
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498 // that list, if _free_regions_coming is set. |
| 2361 | 499 HeapRegion* new_region_try_secondary_free_list(); |
| 342 | 500 |
| 2361 | 501 // Try to allocate a single non-humongous HeapRegion sufficient for |
| 502 // an allocation of the given word_size. If do_expand is true, | |
| 503 // attempt to expand the heap if necessary to satisfy the allocation | |
| 504 // request. | |
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505 HeapRegion* new_region(size_t word_size, bool do_expand); |
| 342 | 506 |
| 2361 | 507 // Attempt to satisfy a humongous allocation request of the given |
| 508 // size by finding a contiguous set of free regions of num_regions | |
| 509 // length and remove them from the master free list. Return the | |
| 3766 | 510 // index of the first region or G1_NULL_HRS_INDEX if the search |
| 511 // was unsuccessful. | |
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512 uint humongous_obj_allocate_find_first(uint num_regions, |
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513 size_t word_size); |
| 342 | 514 |
| 2361 | 515 // Initialize a contiguous set of free regions of length num_regions |
| 516 // and starting at index first so that they appear as a single | |
| 517 // humongous region. | |
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518 HeapWord* humongous_obj_allocate_initialize_regions(uint first, |
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519 uint num_regions, |
| 2361 | 520 size_t word_size); |
| 521 | |
| 522 // Attempt to allocate a humongous object of the given size. Return | |
| 523 // NULL if unsuccessful. | |
| 2152 | 524 HeapWord* humongous_obj_allocate(size_t word_size); |
| 1973 | 525 |
| 526 // The following two methods, allocate_new_tlab() and | |
| 527 // mem_allocate(), are the two main entry points from the runtime | |
| 528 // into the G1's allocation routines. They have the following | |
| 529 // assumptions: | |
| 530 // | |
| 531 // * They should both be called outside safepoints. | |
| 532 // | |
| 533 // * They should both be called without holding the Heap_lock. | |
| 534 // | |
| 535 // * All allocation requests for new TLABs should go to | |
| 536 // allocate_new_tlab(). | |
| 537 // | |
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538 // * All non-TLAB allocation requests should go to mem_allocate(). |
| 1973 | 539 // |
| 540 // * If either call cannot satisfy the allocation request using the | |
| 541 // current allocating region, they will try to get a new one. If | |
| 542 // this fails, they will attempt to do an evacuation pause and | |
| 543 // retry the allocation. | |
| 544 // | |
| 545 // * If all allocation attempts fail, even after trying to schedule | |
| 546 // an evacuation pause, allocate_new_tlab() will return NULL, | |
| 547 // whereas mem_allocate() will attempt a heap expansion and/or | |
| 548 // schedule a Full GC. | |
| 549 // | |
| 550 // * We do not allow humongous-sized TLABs. So, allocate_new_tlab | |
| 551 // should never be called with word_size being humongous. All | |
| 552 // humongous allocation requests should go to mem_allocate() which | |
| 553 // will satisfy them with a special path. | |
| 554 | |
| 555 virtual HeapWord* allocate_new_tlab(size_t word_size); | |
| 556 | |
| 557 virtual HeapWord* mem_allocate(size_t word_size, | |
| 558 bool* gc_overhead_limit_was_exceeded); | |
| 342 | 559 |
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560 // The following three methods take a gc_count_before_ret |
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561 // parameter which is used to return the GC count if the method |
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562 // returns NULL. Given that we are required to read the GC count |
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563 // while holding the Heap_lock, and these paths will take the |
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564 // Heap_lock at some point, it's easier to get them to read the GC |
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565 // count while holding the Heap_lock before they return NULL instead |
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566 // of the caller (namely: mem_allocate()) having to also take the |
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567 // Heap_lock just to read the GC count. |
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568 |
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569 // First-level mutator allocation attempt: try to allocate out of |
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570 // the mutator alloc region without taking the Heap_lock. This |
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571 // should only be used for non-humongous allocations. |
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572 inline HeapWord* attempt_allocation(size_t word_size, |
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573 unsigned int* gc_count_before_ret, |
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574 int* gclocker_retry_count_ret); |
| 342 | 575 |
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576 // Second-level mutator allocation attempt: take the Heap_lock and |
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577 // retry the allocation attempt, potentially scheduling a GC |
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578 // pause. This should only be used for non-humongous allocations. |
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579 HeapWord* attempt_allocation_slow(size_t word_size, |
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580 unsigned int* gc_count_before_ret, |
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581 int* gclocker_retry_count_ret); |
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582 |
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583 // Takes the Heap_lock and attempts a humongous allocation. It can |
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584 // potentially schedule a GC pause. |
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585 HeapWord* attempt_allocation_humongous(size_t word_size, |
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586 unsigned int* gc_count_before_ret, |
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587 int* gclocker_retry_count_ret); |
| 1973 | 588 |
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589 // Allocation attempt that should be called during safepoints (e.g., |
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590 // at the end of a successful GC). expect_null_mutator_alloc_region |
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591 // specifies whether the mutator alloc region is expected to be NULL |
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592 // or not. |
| 1973 | 593 HeapWord* attempt_allocation_at_safepoint(size_t word_size, |
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594 bool expect_null_mutator_alloc_region); |
| 1973 | 595 |
| 596 // It dirties the cards that cover the block so that so that the post | |
| 597 // write barrier never queues anything when updating objects on this | |
| 598 // block. It is assumed (and in fact we assert) that the block | |
| 599 // belongs to a young region. | |
| 600 inline void dirty_young_block(HeapWord* start, size_t word_size); | |
| 342 | 601 |
| 602 // Allocate blocks during garbage collection. Will ensure an | |
| 603 // allocation region, either by picking one or expanding the | |
| 604 // heap, and then allocate a block of the given size. The block | |
| 605 // may not be a humongous - it must fit into a single heap region. | |
| 606 HeapWord* par_allocate_during_gc(GCAllocPurpose purpose, size_t word_size); | |
| 607 | |
| 608 // Ensure that no further allocations can happen in "r", bearing in mind | |
| 609 // that parallel threads might be attempting allocations. | |
| 610 void par_allocate_remaining_space(HeapRegion* r); | |
| 611 | |
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612 // Allocation attempt during GC for a survivor object / PLAB. |
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613 inline HeapWord* survivor_attempt_allocation(size_t word_size); |
| 545 | 614 |
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615 // Allocation attempt during GC for an old object / PLAB. |
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616 inline HeapWord* old_attempt_allocation(size_t word_size); |
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617 |
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618 // These methods are the "callbacks" from the G1AllocRegion class. |
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619 |
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620 // For mutator alloc regions. |
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621 HeapRegion* new_mutator_alloc_region(size_t word_size, bool force); |
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622 void retire_mutator_alloc_region(HeapRegion* alloc_region, |
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623 size_t allocated_bytes); |
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624 |
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625 // For GC alloc regions. |
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626 HeapRegion* new_gc_alloc_region(size_t word_size, uint count, |
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627 GCAllocPurpose ap); |
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628 void retire_gc_alloc_region(HeapRegion* alloc_region, |
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629 size_t allocated_bytes, GCAllocPurpose ap); |
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630 |
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631 // - if explicit_gc is true, the GC is for a System.gc() or a heap |
| 1973 | 632 // inspection request and should collect the entire heap |
| 633 // - if clear_all_soft_refs is true, all soft references should be | |
| 634 // cleared during the GC | |
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635 // - if explicit_gc is false, word_size describes the allocation that |
| 1973 | 636 // the GC should attempt (at least) to satisfy |
| 637 // - it returns false if it is unable to do the collection due to the | |
| 638 // GC locker being active, true otherwise | |
| 639 bool do_collection(bool explicit_gc, | |
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640 bool clear_all_soft_refs, |
| 342 | 641 size_t word_size); |
| 642 | |
| 643 // Callback from VM_G1CollectFull operation. | |
| 644 // Perform a full collection. | |
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645 virtual void do_full_collection(bool clear_all_soft_refs); |
| 342 | 646 |
| 647 // Resize the heap if necessary after a full collection. If this is | |
| 648 // after a collect-for allocation, "word_size" is the allocation size, | |
| 649 // and will be considered part of the used portion of the heap. | |
| 650 void resize_if_necessary_after_full_collection(size_t word_size); | |
| 651 | |
| 652 // Callback from VM_G1CollectForAllocation operation. | |
| 653 // This function does everything necessary/possible to satisfy a | |
| 654 // failed allocation request (including collection, expansion, etc.) | |
| 1973 | 655 HeapWord* satisfy_failed_allocation(size_t word_size, bool* succeeded); |
| 342 | 656 |
| 657 // Attempting to expand the heap sufficiently | |
| 658 // to support an allocation of the given "word_size". If | |
| 659 // successful, perform the allocation and return the address of the | |
| 660 // allocated block, or else "NULL". | |
| 1973 | 661 HeapWord* expand_and_allocate(size_t word_size); |
| 342 | 662 |
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663 // Process any reference objects discovered during |
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664 // an incremental evacuation pause. |
| 6819 | 665 void process_discovered_references(uint no_of_gc_workers); |
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666 |
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667 // Enqueue any remaining discovered references |
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668 // after processing. |
| 6819 | 669 void enqueue_discovered_references(uint no_of_gc_workers); |
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670 |
| 342 | 671 public: |
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672 |
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673 G1MonitoringSupport* g1mm() { |
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674 assert(_g1mm != NULL, "should have been initialized"); |
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675 return _g1mm; |
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676 } |
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677 |
| 342 | 678 // Expand the garbage-first heap by at least the given size (in bytes!). |
|
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679 // Returns true if the heap was expanded by the requested amount; |
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680 // false otherwise. |
| 342 | 681 // (Rounds up to a HeapRegion boundary.) |
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682 bool expand(size_t expand_bytes); |
| 342 | 683 |
| 684 // Do anything common to GC's. | |
| 685 virtual void gc_prologue(bool full); | |
| 686 virtual void gc_epilogue(bool full); | |
| 687 | |
|
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688 #ifdef GRAAL |
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689 HeapWord** top_addr() const; |
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690 HeapWord** end_addr() const; |
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691 |
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692 #endif |
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693 |
| 526 | 694 // We register a region with the fast "in collection set" test. We |
| 695 // simply set to true the array slot corresponding to this region. | |
| 696 void register_region_with_in_cset_fast_test(HeapRegion* r) { | |
| 697 assert(_in_cset_fast_test_base != NULL, "sanity"); | |
| 698 assert(r->in_collection_set(), "invariant"); | |
|
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699 uint index = r->hrs_index(); |
| 3766 | 700 assert(index < _in_cset_fast_test_length, "invariant"); |
| 526 | 701 assert(!_in_cset_fast_test_base[index], "invariant"); |
| 702 _in_cset_fast_test_base[index] = true; | |
| 703 } | |
| 704 | |
| 705 // This is a fast test on whether a reference points into the | |
| 706 // collection set or not. It does not assume that the reference | |
| 707 // points into the heap; if it doesn't, it will return false. | |
| 708 bool in_cset_fast_test(oop obj) { | |
| 709 assert(_in_cset_fast_test != NULL, "sanity"); | |
| 710 if (_g1_committed.contains((HeapWord*) obj)) { | |
| 711 // no need to subtract the bottom of the heap from obj, | |
| 712 // _in_cset_fast_test is biased | |
|
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713 uintx index = cast_from_oop<uintx>(obj) >> HeapRegion::LogOfHRGrainBytes; |
| 526 | 714 bool ret = _in_cset_fast_test[index]; |
| 715 // let's make sure the result is consistent with what the slower | |
| 716 // test returns | |
| 717 assert( ret || !obj_in_cs(obj), "sanity"); | |
| 718 assert(!ret || obj_in_cs(obj), "sanity"); | |
| 719 return ret; | |
| 720 } else { | |
| 721 return false; | |
| 722 } | |
| 723 } | |
| 724 | |
|
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725 void clear_cset_fast_test() { |
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726 assert(_in_cset_fast_test_base != NULL, "sanity"); |
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727 memset(_in_cset_fast_test_base, false, |
|
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728 (size_t) _in_cset_fast_test_length * sizeof(bool)); |
|
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729 } |
|
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730 |
|
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731 // This is called at the start of either a concurrent cycle or a Full |
|
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732 // GC to update the number of old marking cycles started. |
|
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733 void increment_old_marking_cycles_started(); |
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734 |
|
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735 // This is called at the end of either a concurrent cycle or a Full |
|
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736 // GC to update the number of old marking cycles completed. Those two |
|
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737 // can happen in a nested fashion, i.e., we start a concurrent |
|
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738 // cycle, a Full GC happens half-way through it which ends first, |
|
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739 // and then the cycle notices that a Full GC happened and ends |
|
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740 // too. The concurrent parameter is a boolean to help us do a bit |
|
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741 // tighter consistency checking in the method. If concurrent is |
|
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742 // false, the caller is the inner caller in the nesting (i.e., the |
|
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743 // Full GC). If concurrent is true, the caller is the outer caller |
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744 // in this nesting (i.e., the concurrent cycle). Further nesting is |
|
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745 // not currently supported. The end of this call also notifies |
|
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746 // the FullGCCount_lock in case a Java thread is waiting for a full |
|
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747 // GC to happen (e.g., it called System.gc() with |
|
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748 // +ExplicitGCInvokesConcurrent). |
|
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749 void increment_old_marking_cycles_completed(bool concurrent); |
|
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750 |
|
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751 unsigned int old_marking_cycles_completed() { |
|
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752 return _old_marking_cycles_completed; |
|
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753 } |
|
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|
754 |
| 10405 | 755 void register_concurrent_cycle_start(jlong start_time); |
| 756 void register_concurrent_cycle_end(); | |
| 757 void trace_heap_after_concurrent_cycle(); | |
| 758 | |
| 759 G1YCType yc_type(); | |
| 760 | |
|
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761 G1HRPrinter* hr_printer() { return &_hr_printer; } |
|
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762 |
| 342 | 763 protected: |
| 764 | |
| 765 // Shrink the garbage-first heap by at most the given size (in bytes!). | |
| 766 // (Rounds down to a HeapRegion boundary.) | |
| 767 virtual void shrink(size_t expand_bytes); | |
| 768 void shrink_helper(size_t expand_bytes); | |
| 769 | |
| 1709 | 770 #if TASKQUEUE_STATS |
| 771 static void print_taskqueue_stats_hdr(outputStream* const st = gclog_or_tty); | |
| 772 void print_taskqueue_stats(outputStream* const st = gclog_or_tty) const; | |
| 773 void reset_taskqueue_stats(); | |
| 774 #endif // TASKQUEUE_STATS | |
| 775 | |
| 1973 | 776 // Schedule the VM operation that will do an evacuation pause to |
| 777 // satisfy an allocation request of word_size. *succeeded will | |
| 778 // return whether the VM operation was successful (it did do an | |
| 779 // evacuation pause) or not (another thread beat us to it or the GC | |
| 780 // locker was active). Given that we should not be holding the | |
| 781 // Heap_lock when we enter this method, we will pass the | |
| 782 // gc_count_before (i.e., total_collections()) as a parameter since | |
| 783 // it has to be read while holding the Heap_lock. Currently, both | |
| 784 // methods that call do_collection_pause() release the Heap_lock | |
| 785 // before the call, so it's easy to read gc_count_before just before. | |
|
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786 HeapWord* do_collection_pause(size_t word_size, |
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787 unsigned int gc_count_before, |
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788 bool* succeeded, |
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789 GCCause::Cause gc_cause); |
| 342 | 790 |
| 791 // The guts of the incremental collection pause, executed by the vm | |
| 1973 | 792 // thread. It returns false if it is unable to do the collection due |
| 793 // to the GC locker being active, true otherwise | |
| 794 bool do_collection_pause_at_safepoint(double target_pause_time_ms); | |
| 342 | 795 |
| 796 // Actually do the work of evacuating the collection set. | |
| 10405 | 797 void evacuate_collection_set(EvacuationInfo& evacuation_info); |
| 342 | 798 |
| 799 // The g1 remembered set of the heap. | |
| 800 G1RemSet* _g1_rem_set; | |
| 801 | |
|
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|
802 // A set of cards that cover the objects for which the Rsets should be updated |
|
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803 // concurrently after the collection. |
|
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804 DirtyCardQueueSet _dirty_card_queue_set; |
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805 |
| 342 | 806 // The closure used to refine a single card. |
| 807 RefineCardTableEntryClosure* _refine_cte_cl; | |
| 808 | |
| 809 // A function to check the consistency of dirty card logs. | |
| 810 void check_ct_logs_at_safepoint(); | |
| 811 | |
| 1705 | 812 // A DirtyCardQueueSet that is used to hold cards that contain |
| 813 // references into the current collection set. This is used to | |
| 814 // update the remembered sets of the regions in the collection | |
| 815 // set in the event of an evacuation failure. | |
| 816 DirtyCardQueueSet _into_cset_dirty_card_queue_set; | |
| 817 | |
| 342 | 818 // After a collection pause, make the regions in the CS into free |
| 819 // regions. | |
| 10405 | 820 void free_collection_set(HeapRegion* cs_head, EvacuationInfo& evacuation_info); |
| 342 | 821 |
|
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822 // Abandon the current collection set without recording policy |
|
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823 // statistics or updating free lists. |
|
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824 void abandon_collection_set(HeapRegion* cs_head); |
|
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|
825 |
| 342 | 826 // Applies "scan_non_heap_roots" to roots outside the heap, |
| 827 // "scan_rs" to roots inside the heap (having done "set_region" to | |
|
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828 // indicate the region in which the root resides), |
|
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|
829 // and does "scan_metadata" If "scan_rs" is |
| 342 | 830 // NULL, then this step is skipped. The "worker_i" |
| 831 // param is for use with parallel roots processing, and should be | |
| 832 // the "i" of the calling parallel worker thread's work(i) function. | |
| 833 // In the sequential case this param will be ignored. | |
|
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834 void g1_process_strong_roots(bool is_scavenging, |
|
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|
835 ScanningOption so, |
| 342 | 836 OopClosure* scan_non_heap_roots, |
| 837 OopsInHeapRegionClosure* scan_rs, | |
|
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838 G1KlassScanClosure* scan_klasses, |
| 342 | 839 int worker_i); |
| 840 | |
| 841 // Apply "blk" to all the weak roots of the system. These include | |
| 842 // JNI weak roots, the code cache, system dictionary, symbol table, | |
| 843 // string table, and referents of reachable weak refs. | |
|
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844 void g1_process_weak_roots(OopClosure* root_closure); |
| 342 | 845 |
| 2361 | 846 // Frees a non-humongous region by initializing its contents and |
| 2152 | 847 // adding it to the free list that's passed as a parameter (this is |
| 848 // usually a local list which will be appended to the master free | |
| 849 // list later). The used bytes of freed regions are accumulated in | |
| 850 // pre_used. If par is true, the region's RSet will not be freed | |
| 851 // up. The assumption is that this will be done later. | |
| 852 void free_region(HeapRegion* hr, | |
| 853 size_t* pre_used, | |
| 854 FreeRegionList* free_list, | |
| 855 bool par); | |
| 342 | 856 |
| 2361 | 857 // Frees a humongous region by collapsing it into individual regions |
| 858 // and calling free_region() for each of them. The freed regions | |
| 859 // will be added to the free list that's passed as a parameter (this | |
| 860 // is usually a local list which will be appended to the master free | |
| 861 // list later). The used bytes of freed regions are accumulated in | |
| 862 // pre_used. If par is true, the region's RSet will not be freed | |
| 863 // up. The assumption is that this will be done later. | |
| 2152 | 864 void free_humongous_region(HeapRegion* hr, |
| 865 size_t* pre_used, | |
| 866 FreeRegionList* free_list, | |
| 867 HumongousRegionSet* humongous_proxy_set, | |
| 868 bool par); | |
| 342 | 869 |
| 3766 | 870 // Notifies all the necessary spaces that the committed space has |
| 871 // been updated (either expanded or shrunk). It should be called | |
| 872 // after _g1_storage is updated. | |
| 873 void update_committed_space(HeapWord* old_end, HeapWord* new_end); | |
| 874 | |
| 342 | 875 // The concurrent marker (and the thread it runs in.) |
| 876 ConcurrentMark* _cm; | |
| 877 ConcurrentMarkThread* _cmThread; | |
| 878 bool _mark_in_progress; | |
| 879 | |
| 880 // The concurrent refiner. | |
| 881 ConcurrentG1Refine* _cg1r; | |
| 882 | |
| 883 // The parallel task queues | |
| 884 RefToScanQueueSet *_task_queues; | |
| 885 | |
| 886 // True iff a evacuation has failed in the current collection. | |
| 887 bool _evacuation_failed; | |
| 888 | |
| 10405 | 889 EvacuationFailedInfo* _evacuation_failed_info_array; |
| 342 | 890 |
| 891 // Failed evacuations cause some logical from-space objects to have | |
| 892 // forwarding pointers to themselves. Reset them. | |
| 893 void remove_self_forwarding_pointers(); | |
| 894 | |
|
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895 // Together, these store an object with a preserved mark, and its mark value. |
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896 Stack<oop, mtGC> _objs_with_preserved_marks; |
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897 Stack<markOop, mtGC> _preserved_marks_of_objs; |
| 342 | 898 |
| 899 // Preserve the mark of "obj", if necessary, in preparation for its mark | |
| 900 // word being overwritten with a self-forwarding-pointer. | |
| 901 void preserve_mark_if_necessary(oop obj, markOop m); | |
| 902 | |
| 903 // The stack of evac-failure objects left to be scanned. | |
| 904 GrowableArray<oop>* _evac_failure_scan_stack; | |
| 905 // The closure to apply to evac-failure objects. | |
| 906 | |
| 907 OopsInHeapRegionClosure* _evac_failure_closure; | |
| 908 // Set the field above. | |
| 909 void | |
| 910 set_evac_failure_closure(OopsInHeapRegionClosure* evac_failure_closure) { | |
| 911 _evac_failure_closure = evac_failure_closure; | |
| 912 } | |
| 913 | |
| 914 // Push "obj" on the scan stack. | |
| 915 void push_on_evac_failure_scan_stack(oop obj); | |
| 916 // Process scan stack entries until the stack is empty. | |
| 917 void drain_evac_failure_scan_stack(); | |
| 918 // True iff an invocation of "drain_scan_stack" is in progress; to | |
| 919 // prevent unnecessary recursion. | |
| 920 bool _drain_in_progress; | |
| 921 | |
| 922 // Do any necessary initialization for evacuation-failure handling. | |
| 923 // "cl" is the closure that will be used to process evac-failure | |
| 924 // objects. | |
| 925 void init_for_evac_failure(OopsInHeapRegionClosure* cl); | |
| 926 // Do any necessary cleanup for evacuation-failure handling data | |
| 927 // structures. | |
| 928 void finalize_for_evac_failure(); | |
| 929 | |
| 930 // An attempt to evacuate "obj" has failed; take necessary steps. | |
| 10405 | 931 oop handle_evacuation_failure_par(G1ParScanThreadState* _par_scan_state, oop obj); |
| 342 | 932 void handle_evacuation_failure_common(oop obj, markOop m); |
| 933 | |
|
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934 #ifndef PRODUCT |
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935 // Support for forcing evacuation failures. Analogous to |
|
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936 // PromotionFailureALot for the other collectors. |
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937 |
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938 // Records whether G1EvacuationFailureALot should be in effect |
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939 // for the current GC |
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940 bool _evacuation_failure_alot_for_current_gc; |
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941 |
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942 // Used to record the GC number for interval checking when |
|
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943 // determining whether G1EvaucationFailureALot is in effect |
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944 // for the current GC. |
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945 size_t _evacuation_failure_alot_gc_number; |
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946 |
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947 // Count of the number of evacuations between failures. |
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948 volatile size_t _evacuation_failure_alot_count; |
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949 |
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950 // Set whether G1EvacuationFailureALot should be in effect |
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951 // for the current GC (based upon the type of GC and which |
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952 // command line flags are set); |
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953 inline bool evacuation_failure_alot_for_gc_type(bool gcs_are_young, |
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954 bool during_initial_mark, |
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955 bool during_marking); |
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956 |
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957 inline void set_evacuation_failure_alot_for_current_gc(); |
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958 |
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959 // Return true if it's time to cause an evacuation failure. |
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960 inline bool evacuation_should_fail(); |
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961 |
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962 // Reset the G1EvacuationFailureALot counters. Should be called at |
| 10405 | 963 // the end of an evacuation pause in which an evacuation failure occurred. |
|
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964 inline void reset_evacuation_should_fail(); |
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965 #endif // !PRODUCT |
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966 |
|
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967 // ("Weak") Reference processing support. |
|
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968 // |
| 10405 | 969 // G1 has 2 instances of the reference processor class. One |
|
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970 // (_ref_processor_cm) handles reference object discovery |
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971 // and subsequent processing during concurrent marking cycles. |
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972 // |
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973 // The other (_ref_processor_stw) handles reference object |
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974 // discovery and processing during full GCs and incremental |
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975 // evacuation pauses. |
|
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976 // |
|
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977 // During an incremental pause, reference discovery will be |
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978 // temporarily disabled for _ref_processor_cm and will be |
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979 // enabled for _ref_processor_stw. At the end of the evacuation |
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980 // pause references discovered by _ref_processor_stw will be |
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981 // processed and discovery will be disabled. The previous |
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982 // setting for reference object discovery for _ref_processor_cm |
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983 // will be re-instated. |
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984 // |
|
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985 // At the start of marking: |
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986 // * Discovery by the CM ref processor is verified to be inactive |
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987 // and it's discovered lists are empty. |
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988 // * Discovery by the CM ref processor is then enabled. |
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989 // |
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990 // At the end of marking: |
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991 // * Any references on the CM ref processor's discovered |
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992 // lists are processed (possibly MT). |
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993 // |
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994 // At the start of full GC we: |
|
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995 // * Disable discovery by the CM ref processor and |
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996 // empty CM ref processor's discovered lists |
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997 // (without processing any entries). |
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998 // * Verify that the STW ref processor is inactive and it's |
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999 // discovered lists are empty. |
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1000 // * Temporarily set STW ref processor discovery as single threaded. |
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1001 // * Temporarily clear the STW ref processor's _is_alive_non_header |
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1002 // field. |
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1003 // * Finally enable discovery by the STW ref processor. |
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1004 // |
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1005 // The STW ref processor is used to record any discovered |
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1006 // references during the full GC. |
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1007 // |
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1008 // At the end of a full GC we: |
|
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1009 // * Enqueue any reference objects discovered by the STW ref processor |
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1010 // that have non-live referents. This has the side-effect of |
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1011 // making the STW ref processor inactive by disabling discovery. |
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1012 // * Verify that the CM ref processor is still inactive |
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1013 // and no references have been placed on it's discovered |
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1014 // lists (also checked as a precondition during initial marking). |
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1015 |
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1016 // The (stw) reference processor... |
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1017 ReferenceProcessor* _ref_processor_stw; |
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1018 |
| 10405 | 1019 STWGCTimer* _gc_timer_stw; |
| 1020 ConcurrentGCTimer* _gc_timer_cm; | |
| 1021 | |
| 1022 G1OldTracer* _gc_tracer_cm; | |
| 1023 G1NewTracer* _gc_tracer_stw; | |
| 1024 | |
|
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1025 // During reference object discovery, the _is_alive_non_header |
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1026 // closure (if non-null) is applied to the referent object to |
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1027 // determine whether the referent is live. If so then the |
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1028 // reference object does not need to be 'discovered' and can |
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1029 // be treated as a regular oop. This has the benefit of reducing |
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1030 // the number of 'discovered' reference objects that need to |
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1031 // be processed. |
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1032 // |
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1033 // Instance of the is_alive closure for embedding into the |
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1034 // STW reference processor as the _is_alive_non_header field. |
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1035 // Supplying a value for the _is_alive_non_header field is |
|
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1036 // optional but doing so prevents unnecessary additions to |
|
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1037 // the discovered lists during reference discovery. |
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1038 G1STWIsAliveClosure _is_alive_closure_stw; |
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1039 |
|
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1040 // The (concurrent marking) reference processor... |
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|
1041 ReferenceProcessor* _ref_processor_cm; |
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1042 |
|
2037
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1043 // Instance of the concurrent mark is_alive closure for embedding |
|
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1044 // into the Concurrent Marking reference processor as the |
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1045 // _is_alive_non_header field. Supplying a value for the |
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1046 // _is_alive_non_header field is optional but doing so prevents |
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1047 // unnecessary additions to the discovered lists during reference |
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1048 // discovery. |
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1049 G1CMIsAliveClosure _is_alive_closure_cm; |
| 342 | 1050 |
|
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1051 // Cache used by G1CollectedHeap::start_cset_region_for_worker(). |
|
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1052 HeapRegion** _worker_cset_start_region; |
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1053 |
|
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1054 // Time stamp to validate the regions recorded in the cache |
|
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1055 // used by G1CollectedHeap::start_cset_region_for_worker(). |
|
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1056 // The heap region entry for a given worker is valid iff |
|
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1057 // the associated time stamp value matches the current value |
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1058 // of G1CollectedHeap::_gc_time_stamp. |
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1059 unsigned int* _worker_cset_start_region_time_stamp; |
|
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1060 |
| 342 | 1061 enum G1H_process_strong_roots_tasks { |
|
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1062 G1H_PS_filter_satb_buffers, |
| 342 | 1063 G1H_PS_refProcessor_oops_do, |
| 1064 // Leave this one last. | |
| 1065 G1H_PS_NumElements | |
| 1066 }; | |
| 1067 | |
| 1068 SubTasksDone* _process_strong_tasks; | |
| 1069 | |
| 2152 | 1070 volatile bool _free_regions_coming; |
| 342 | 1071 |
| 1072 public: | |
|
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1073 |
|
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1074 SubTasksDone* process_strong_tasks() { return _process_strong_tasks; } |
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1075 |
| 342 | 1076 void set_refine_cte_cl_concurrency(bool concurrent); |
| 1077 | |
| 1709 | 1078 RefToScanQueue *task_queue(int i) const; |
| 342 | 1079 |
|
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1080 // A set of cards where updates happened during the GC |
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1081 DirtyCardQueueSet& dirty_card_queue_set() { return _dirty_card_queue_set; } |
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1082 |
| 1705 | 1083 // A DirtyCardQueueSet that is used to hold cards that contain |
| 1084 // references into the current collection set. This is used to | |
| 1085 // update the remembered sets of the regions in the collection | |
| 1086 // set in the event of an evacuation failure. | |
| 1087 DirtyCardQueueSet& into_cset_dirty_card_queue_set() | |
| 1088 { return _into_cset_dirty_card_queue_set; } | |
| 1089 | |
| 342 | 1090 // Create a G1CollectedHeap with the specified policy. |
| 1091 // Must call the initialize method afterwards. | |
| 1092 // May not return if something goes wrong. | |
| 1093 G1CollectedHeap(G1CollectorPolicy* policy); | |
| 1094 | |
| 1095 // Initialize the G1CollectedHeap to have the initial and | |
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1096 // maximum sizes and remembered and barrier sets |
| 342 | 1097 // specified by the policy object. |
| 1098 jint initialize(); | |
| 1099 | |
|
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1100 // Return the (conservative) maximum heap alignment for any G1 heap |
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1101 static size_t conservative_max_heap_alignment(); |
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1102 |
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1103 // Initialize weak reference processing. |
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1104 virtual void ref_processing_init(); |
| 342 | 1105 |
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1106 void set_par_threads(uint t) { |
| 342 | 1107 SharedHeap::set_par_threads(t); |
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1108 // Done in SharedHeap but oddly there are |
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1109 // two _process_strong_tasks's in a G1CollectedHeap |
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1110 // so do it here too. |
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1111 _process_strong_tasks->set_n_threads(t); |
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1112 } |
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1113 |
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1114 // Set _n_par_threads according to a policy TBD. |
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1115 void set_par_threads(); |
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1116 |
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1117 void set_n_termination(int t) { |
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1118 _process_strong_tasks->set_n_threads(t); |
| 342 | 1119 } |
| 1120 | |
| 1121 virtual CollectedHeap::Name kind() const { | |
| 1122 return CollectedHeap::G1CollectedHeap; | |
| 1123 } | |
| 1124 | |
| 1125 // The current policy object for the collector. | |
| 1126 G1CollectorPolicy* g1_policy() const { return _g1_policy; } | |
| 1127 | |
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1128 virtual CollectorPolicy* collector_policy() const { return (CollectorPolicy*) g1_policy(); } |
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1129 |
| 342 | 1130 // Adaptive size policy. No such thing for g1. |
| 1131 virtual AdaptiveSizePolicy* size_policy() { return NULL; } | |
| 1132 | |
| 1133 // The rem set and barrier set. | |
| 1134 G1RemSet* g1_rem_set() const { return _g1_rem_set; } | |
| 1135 | |
| 1136 unsigned get_gc_time_stamp() { | |
| 1137 return _gc_time_stamp; | |
| 1138 } | |
| 1139 | |
| 1140 void reset_gc_time_stamp() { | |
| 1141 _gc_time_stamp = 0; | |
|
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1142 OrderAccess::fence(); |
|
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1143 // Clear the cached CSet starting regions and time stamps. |
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1144 // Their validity is dependent on the GC timestamp. |
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1145 clear_cset_start_regions(); |
|
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1146 } |
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1147 |
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1148 void check_gc_time_stamps() PRODUCT_RETURN; |
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1149 |
|
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1150 void increment_gc_time_stamp() { |
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1151 ++_gc_time_stamp; |
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1152 OrderAccess::fence(); |
| 342 | 1153 } |
| 1154 | |
|
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1155 // Reset the given region's GC timestamp. If it's starts humongous, |
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1156 // also reset the GC timestamp of its corresponding |
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1157 // continues humongous regions too. |
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1158 void reset_gc_time_stamps(HeapRegion* hr); |
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1159 |
| 1705 | 1160 void iterate_dirty_card_closure(CardTableEntryClosure* cl, |
| 1161 DirtyCardQueue* into_cset_dcq, | |
| 1162 bool concurrent, int worker_i); | |
| 342 | 1163 |
| 1164 // The shared block offset table array. | |
| 1165 G1BlockOffsetSharedArray* bot_shared() const { return _bot_shared; } | |
| 1166 | |
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1167 // Reference Processing accessors |
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1168 |
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1169 // The STW reference processor.... |
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1170 ReferenceProcessor* ref_processor_stw() const { return _ref_processor_stw; } |
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1171 |
| 10405 | 1172 // The Concurrent Marking reference processor... |
|
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1173 ReferenceProcessor* ref_processor_cm() const { return _ref_processor_cm; } |
| 342 | 1174 |
| 10405 | 1175 ConcurrentGCTimer* gc_timer_cm() const { return _gc_timer_cm; } |
| 1176 G1OldTracer* gc_tracer_cm() const { return _gc_tracer_cm; } | |
| 1177 | |
| 342 | 1178 virtual size_t capacity() const; |
| 1179 virtual size_t used() const; | |
|
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1180 // This should be called when we're not holding the heap lock. The |
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1181 // result might be a bit inaccurate. |
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1182 size_t used_unlocked() const; |
| 342 | 1183 size_t recalculate_used() const; |
| 1184 | |
| 1185 // These virtual functions do the actual allocation. | |
| 1186 // Some heaps may offer a contiguous region for shared non-blocking | |
| 1187 // allocation, via inlined code (by exporting the address of the top and | |
| 1188 // end fields defining the extent of the contiguous allocation region.) | |
| 1189 // But G1CollectedHeap doesn't yet support this. | |
| 1190 | |
| 1191 // Return an estimate of the maximum allocation that could be performed | |
| 1192 // without triggering any collection or expansion activity. In a | |
| 1193 // generational collector, for example, this is probably the largest | |
| 1194 // allocation that could be supported (without expansion) in the youngest | |
| 1195 // generation. It is "unsafe" because no locks are taken; the result | |
| 1196 // should be treated as an approximation, not a guarantee, for use in | |
| 1197 // heuristic resizing decisions. | |
| 1198 virtual size_t unsafe_max_alloc(); | |
| 1199 | |
| 1200 virtual bool is_maximal_no_gc() const { | |
| 1201 return _g1_storage.uncommitted_size() == 0; | |
| 1202 } | |
| 1203 | |
| 1204 // The total number of regions in the heap. | |
|
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1205 uint n_regions() { return _hrs.length(); } |
| 3766 | 1206 |
| 1207 // The max number of regions in the heap. | |
|
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1208 uint max_regions() { return _hrs.max_length(); } |
| 342 | 1209 |
| 1210 // The number of regions that are completely free. | |
|
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1211 uint free_regions() { return _free_list.length(); } |
| 342 | 1212 |
| 1213 // The number of regions that are not completely free. | |
|
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1214 uint used_regions() { return n_regions() - free_regions(); } |
| 342 | 1215 |
| 1216 // The number of regions available for "regular" expansion. | |
|
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1217 uint expansion_regions() { return _expansion_regions; } |
| 342 | 1218 |
| 3766 | 1219 // Factory method for HeapRegion instances. It will return NULL if |
| 1220 // the allocation fails. | |
|
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1221 HeapRegion* new_heap_region(uint hrs_index, HeapWord* bottom); |
| 3766 | 1222 |
|
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1223 void verify_not_dirty_region(HeapRegion* hr) PRODUCT_RETURN; |
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1224 void verify_dirty_region(HeapRegion* hr) PRODUCT_RETURN; |
|
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1225 void verify_dirty_young_list(HeapRegion* head) PRODUCT_RETURN; |
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1226 void verify_dirty_young_regions() PRODUCT_RETURN; |
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1227 |
| 2152 | 1228 // verify_region_sets() performs verification over the region |
| 1229 // lists. It will be compiled in the product code to be used when | |
| 1230 // necessary (i.e., during heap verification). | |
| 1231 void verify_region_sets(); | |
| 342 | 1232 |
| 2152 | 1233 // verify_region_sets_optional() is planted in the code for |
| 1234 // list verification in non-product builds (and it can be enabled in | |
| 10405 | 1235 // product builds by defining HEAP_REGION_SET_FORCE_VERIFY to be 1). |
| 2152 | 1236 #if HEAP_REGION_SET_FORCE_VERIFY |
| 1237 void verify_region_sets_optional() { | |
| 1238 verify_region_sets(); | |
| 1239 } | |
| 1240 #else // HEAP_REGION_SET_FORCE_VERIFY | |
| 1241 void verify_region_sets_optional() { } | |
| 1242 #endif // HEAP_REGION_SET_FORCE_VERIFY | |
| 342 | 1243 |
| 2152 | 1244 #ifdef ASSERT |
| 2361 | 1245 bool is_on_master_free_list(HeapRegion* hr) { |
| 2152 | 1246 return hr->containing_set() == &_free_list; |
| 1247 } | |
| 342 | 1248 |
| 2361 | 1249 bool is_in_humongous_set(HeapRegion* hr) { |
| 2152 | 1250 return hr->containing_set() == &_humongous_set; |
| 2361 | 1251 } |
| 2152 | 1252 #endif // ASSERT |
| 342 | 1253 |
| 2152 | 1254 // Wrapper for the region list operations that can be called from |
| 1255 // methods outside this class. | |
| 342 | 1256 |
| 2152 | 1257 void secondary_free_list_add_as_tail(FreeRegionList* list) { |
| 1258 _secondary_free_list.add_as_tail(list); | |
| 1259 } | |
| 342 | 1260 |
| 2152 | 1261 void append_secondary_free_list() { |
|
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1262 _free_list.add_as_head(&_secondary_free_list); |
| 2152 | 1263 } |
| 342 | 1264 |
| 2361 | 1265 void append_secondary_free_list_if_not_empty_with_lock() { |
| 1266 // If the secondary free list looks empty there's no reason to | |
| 1267 // take the lock and then try to append it. | |
| 2152 | 1268 if (!_secondary_free_list.is_empty()) { |
| 1269 MutexLockerEx x(SecondaryFreeList_lock, Mutex::_no_safepoint_check_flag); | |
| 1270 append_secondary_free_list(); | |
| 1271 } | |
| 1272 } | |
| 342 | 1273 |
| 4072 | 1274 void old_set_remove(HeapRegion* hr) { |
| 1275 _old_set.remove(hr); | |
| 1276 } | |
| 1277 | |
|
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1278 size_t non_young_capacity_bytes() { |
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1279 return _old_set.total_capacity_bytes() + _humongous_set.total_capacity_bytes(); |
|
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1280 } |
|
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1281 |
| 2152 | 1282 void set_free_regions_coming(); |
| 1283 void reset_free_regions_coming(); | |
| 1284 bool free_regions_coming() { return _free_regions_coming; } | |
| 1285 void wait_while_free_regions_coming(); | |
| 342 | 1286 |
|
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1287 // Determine whether the given region is one that we are using as an |
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1288 // old GC alloc region. |
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1289 bool is_old_gc_alloc_region(HeapRegion* hr) { |
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1290 return hr == _retained_old_gc_alloc_region; |
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1291 } |
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1292 |
| 342 | 1293 // Perform a collection of the heap; intended for use in implementing |
| 1294 // "System.gc". This probably implies as full a collection as the | |
| 1295 // "CollectedHeap" supports. | |
| 1296 virtual void collect(GCCause::Cause cause); | |
| 1297 | |
| 1298 // The same as above but assume that the caller holds the Heap_lock. | |
| 1299 void collect_locked(GCCause::Cause cause); | |
| 1300 | |
| 10405 | 1301 // True iff an evacuation has failed in the most-recent collection. |
| 342 | 1302 bool evacuation_failed() { return _evacuation_failed; } |
| 1303 | |
| 2152 | 1304 // It will free a region if it has allocated objects in it that are |
| 1305 // all dead. It calls either free_region() or | |
| 1306 // free_humongous_region() depending on the type of the region that | |
| 1307 // is passed to it. | |
| 2173 | 1308 void free_region_if_empty(HeapRegion* hr, |
| 1309 size_t* pre_used, | |
| 1310 FreeRegionList* free_list, | |
| 4072 | 1311 OldRegionSet* old_proxy_set, |
| 2173 | 1312 HumongousRegionSet* humongous_proxy_set, |
| 1313 HRRSCleanupTask* hrrs_cleanup_task, | |
| 1314 bool par); | |
| 342 | 1315 |
| 2152 | 1316 // It appends the free list to the master free list and updates the |
| 1317 // master humongous list according to the contents of the proxy | |
| 1318 // list. It also adjusts the total used bytes according to pre_used | |
| 1319 // (if par is true, it will do so by taking the ParGCRareEvent_lock). | |
| 1320 void update_sets_after_freeing_regions(size_t pre_used, | |
| 1321 FreeRegionList* free_list, | |
| 4072 | 1322 OldRegionSet* old_proxy_set, |
| 2152 | 1323 HumongousRegionSet* humongous_proxy_set, |
| 1324 bool par); | |
| 342 | 1325 |
| 4708 | 1326 // Returns "TRUE" iff "p" points into the committed areas of the heap. |
| 342 | 1327 virtual bool is_in(const void* p) const; |
| 1328 | |
| 1329 // Return "TRUE" iff the given object address is within the collection | |
| 1330 // set. | |
| 1331 inline bool obj_in_cs(oop obj); | |
| 1332 | |
| 1333 // Return "TRUE" iff the given object address is in the reserved | |
|
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1334 // region of g1. |
| 342 | 1335 bool is_in_g1_reserved(const void* p) const { |
| 1336 return _g1_reserved.contains(p); | |
| 1337 } | |
| 1338 | |
|
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1339 // Returns a MemRegion that corresponds to the space that has been |
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1340 // reserved for the heap |
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1341 MemRegion g1_reserved() { |
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1342 return _g1_reserved; |
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1343 } |
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1344 |
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|
1345 // Returns a MemRegion that corresponds to the space that has been |
| 342 | 1346 // committed in the heap |
| 1347 MemRegion g1_committed() { | |
| 1348 return _g1_committed; | |
| 1349 } | |
| 1350 | |
| 2311 | 1351 virtual bool is_in_closed_subset(const void* p) const; |
| 342 | 1352 |
| 12343 | 1353 G1SATBCardTableModRefBS* g1_barrier_set() { |
| 1354 return (G1SATBCardTableModRefBS*) barrier_set(); | |
| 1355 } | |
| 1356 | |
| 342 | 1357 // This resets the card table to all zeros. It is used after |
| 1358 // a collection pause which used the card table to claim cards. | |
| 1359 void cleanUpCardTable(); | |
| 1360 | |
| 1361 // Iteration functions. | |
| 1362 | |
| 1363 // Iterate over all the ref-containing fields of all objects, calling | |
| 1364 // "cl.do_oop" on each. | |
|
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1365 virtual void oop_iterate(ExtendedOopClosure* cl); |
| 342 | 1366 |
| 1367 // Same as above, restricted to a memory region. | |
|
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1368 void oop_iterate(MemRegion mr, ExtendedOopClosure* cl); |
| 342 | 1369 |
| 1370 // Iterate over all objects, calling "cl.do_object" on each. | |
|
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1371 virtual void object_iterate(ObjectClosure* cl); |
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1372 |
| 678 | 1373 virtual void safe_object_iterate(ObjectClosure* cl) { |
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1374 object_iterate(cl); |
| 678 | 1375 } |
| 342 | 1376 |
| 1377 // Iterate over all spaces in use in the heap, in ascending address order. | |
| 1378 virtual void space_iterate(SpaceClosure* cl); | |
| 1379 | |
| 1380 // Iterate over heap regions, in address order, terminating the | |
| 1381 // iteration early if the "doHeapRegion" method returns "true". | |
| 3766 | 1382 void heap_region_iterate(HeapRegionClosure* blk) const; |
| 342 | 1383 |
| 3766 | 1384 // Return the region with the given index. It assumes the index is valid. |
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1385 HeapRegion* region_at(uint index) const { return _hrs.at(index); } |
| 342 | 1386 |
| 1387 // Divide the heap region sequence into "chunks" of some size (the number | |
| 1388 // of regions divided by the number of parallel threads times some | |
| 1389 // overpartition factor, currently 4). Assumes that this will be called | |
| 1390 // in parallel by ParallelGCThreads worker threads with discinct worker | |
| 1391 // ids in the range [0..max(ParallelGCThreads-1, 1)], that all parallel | |
| 1392 // calls will use the same "claim_value", and that that claim value is | |
| 1393 // different from the claim_value of any heap region before the start of | |
| 1394 // the iteration. Applies "blk->doHeapRegion" to each of the regions, by | |
| 1395 // attempting to claim the first region in each chunk, and, if | |
| 1396 // successful, applying the closure to each region in the chunk (and | |
| 1397 // setting the claim value of the second and subsequent regions of the | |
| 1398 // chunk.) For now requires that "doHeapRegion" always returns "false", | |
| 1399 // i.e., that a closure never attempt to abort a traversal. | |
| 1400 void heap_region_par_iterate_chunked(HeapRegionClosure* blk, | |
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1401 uint worker, |
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1402 uint no_of_par_workers, |
| 342 | 1403 jint claim_value); |
| 1404 | |
| 390 | 1405 // It resets all the region claim values to the default. |
| 1406 void reset_heap_region_claim_values(); | |
| 1407 | |
|
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1408 // Resets the claim values of regions in the current |
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1409 // collection set to the default. |
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1410 void reset_cset_heap_region_claim_values(); |
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1411 |
| 355 | 1412 #ifdef ASSERT |
| 1413 bool check_heap_region_claim_values(jint claim_value); | |
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1414 |
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1415 // Same as the routine above but only checks regions in the |
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1416 // current collection set. |
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1417 bool check_cset_heap_region_claim_values(jint claim_value); |
| 355 | 1418 #endif // ASSERT |
| 1419 | |
|
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1420 // Clear the cached cset start regions and (more importantly) |
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1421 // the time stamps. Called when we reset the GC time stamp. |
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1422 void clear_cset_start_regions(); |
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1423 |
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1424 // Given the id of a worker, obtain or calculate a suitable |
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1425 // starting region for iterating over the current collection set. |
|
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1426 HeapRegion* start_cset_region_for_worker(int worker_i); |
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1427 |
|
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1428 // This is a convenience method that is used by the |
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1429 // HeapRegionIterator classes to calculate the starting region for |
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1430 // each worker so that they do not all start from the same region. |
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1431 HeapRegion* start_region_for_worker(uint worker_i, uint no_of_par_workers); |
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1432 |
| 342 | 1433 // Iterate over the regions (if any) in the current collection set. |
| 1434 void collection_set_iterate(HeapRegionClosure* blk); | |
| 1435 | |
| 1436 // As above but starting from region r | |
| 1437 void collection_set_iterate_from(HeapRegion* r, HeapRegionClosure *blk); | |
| 1438 | |
| 1439 // Returns the first (lowest address) compactible space in the heap. | |
| 1440 virtual CompactibleSpace* first_compactible_space(); | |
| 1441 | |
| 1442 // A CollectedHeap will contain some number of spaces. This finds the | |
| 1443 // space containing a given address, or else returns NULL. | |
| 1444 virtual Space* space_containing(const void* addr) const; | |
| 1445 | |
| 1446 // A G1CollectedHeap will contain some number of heap regions. This | |
| 1447 // finds the region containing a given address, or else returns NULL. | |
| 3766 | 1448 template <class T> |
| 1449 inline HeapRegion* heap_region_containing(const T addr) const; | |
| 342 | 1450 |
| 1451 // Like the above, but requires "addr" to be in the heap (to avoid a | |
| 1452 // null-check), and unlike the above, may return an continuing humongous | |
| 1453 // region. | |
| 3766 | 1454 template <class T> |
| 1455 inline HeapRegion* heap_region_containing_raw(const T addr) const; | |
| 342 | 1456 |
| 1457 // A CollectedHeap is divided into a dense sequence of "blocks"; that is, | |
| 1458 // each address in the (reserved) heap is a member of exactly | |
| 1459 // one block. The defining characteristic of a block is that it is | |
| 1460 // possible to find its size, and thus to progress forward to the next | |
| 1461 // block. (Blocks may be of different sizes.) Thus, blocks may | |
| 1462 // represent Java objects, or they might be free blocks in a | |
| 1463 // free-list-based heap (or subheap), as long as the two kinds are | |
| 1464 // distinguishable and the size of each is determinable. | |
| 1465 | |
| 1466 // Returns the address of the start of the "block" that contains the | |
| 1467 // address "addr". We say "blocks" instead of "object" since some heaps | |
| 1468 // may not pack objects densely; a chunk may either be an object or a | |
| 1469 // non-object. | |
| 1470 virtual HeapWord* block_start(const void* addr) const; | |
| 1471 | |
| 1472 // Requires "addr" to be the start of a chunk, and returns its size. | |
| 1473 // "addr + size" is required to be the start of a new chunk, or the end | |
| 1474 // of the active area of the heap. | |
| 1475 virtual size_t block_size(const HeapWord* addr) const; | |
| 1476 | |
| 1477 // Requires "addr" to be the start of a block, and returns "TRUE" iff | |
| 1478 // the block is an object. | |
| 1479 virtual bool block_is_obj(const HeapWord* addr) const; | |
| 1480 | |
| 1481 // Does this heap support heap inspection? (+PrintClassHistogram) | |
| 1482 virtual bool supports_heap_inspection() const { return true; } | |
| 1483 | |
| 1484 // Section on thread-local allocation buffers (TLABs) | |
| 1485 // See CollectedHeap for semantics. | |
| 1486 | |
| 1487 virtual bool supports_tlab_allocation() const; | |
| 1488 virtual size_t tlab_capacity(Thread* thr) const; | |
| 1489 virtual size_t unsafe_max_tlab_alloc(Thread* thr) const; | |
| 1490 | |
| 1491 // Can a compiler initialize a new object without store barriers? | |
| 1492 // This permission only extends from the creation of a new object | |
|
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1493 // via a TLAB up to the first subsequent safepoint. If such permission |
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1494 // is granted for this heap type, the compiler promises to call |
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1495 // defer_store_barrier() below on any slow path allocation of |
|
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1496 // a new object for which such initializing store barriers will |
|
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1497 // have been elided. G1, like CMS, allows this, but should be |
|
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1498 // ready to provide a compensating write barrier as necessary |
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1499 // if that storage came out of a non-young region. The efficiency |
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1500 // of this implementation depends crucially on being able to |
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1501 // answer very efficiently in constant time whether a piece of |
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1502 // storage in the heap comes from a young region or not. |
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|
1503 // See ReduceInitialCardMarks. |
| 342 | 1504 virtual bool can_elide_tlab_store_barriers() const { |
|
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1505 return true; |
|
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1506 } |
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|
1507 |
| 1166 | 1508 virtual bool card_mark_must_follow_store() const { |
| 1509 return true; | |
| 1510 } | |
| 1511 | |
| 3766 | 1512 bool is_in_young(const oop obj) { |
|
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1513 HeapRegion* hr = heap_region_containing(obj); |
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1514 return hr != NULL && hr->is_young(); |
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1515 } |
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|
1516 |
|
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1517 #ifdef ASSERT |
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1518 virtual bool is_in_partial_collection(const void* p); |
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1519 #endif |
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1520 |
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1521 virtual bool is_scavengable(const void* addr); |
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1522 |
|
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1523 // We don't need barriers for initializing stores to objects |
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1524 // in the young gen: for the SATB pre-barrier, there is no |
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1525 // pre-value that needs to be remembered; for the remembered-set |
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1526 // update logging post-barrier, we don't maintain remembered set |
|
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1527 // information for young gen objects. |
|
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1528 virtual bool can_elide_initializing_store_barrier(oop new_obj) { |
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1529 return is_in_young(new_obj); |
| 342 | 1530 } |
| 1531 | |
| 1532 // Returns "true" iff the given word_size is "very large". | |
| 1533 static bool isHumongous(size_t word_size) { | |
|
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1534 // Note this has to be strictly greater-than as the TLABs |
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1535 // are capped at the humongous thresold and we want to |
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1536 // ensure that we don't try to allocate a TLAB as |
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1537 // humongous and that we don't allocate a humongous |
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1538 // object in a TLAB. |
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1539 return word_size > _humongous_object_threshold_in_words; |
| 342 | 1540 } |
| 1541 | |
| 1542 // Update mod union table with the set of dirty cards. | |
| 1543 void updateModUnion(); | |
| 1544 | |
| 1545 // Set the mod union bits corresponding to the given memRegion. Note | |
| 1546 // that this is always a safe operation, since it doesn't clear any | |
| 1547 // bits. | |
| 1548 void markModUnionRange(MemRegion mr); | |
| 1549 | |
| 1550 // Records the fact that a marking phase is no longer in progress. | |
| 1551 void set_marking_complete() { | |
| 1552 _mark_in_progress = false; | |
| 1553 } | |
| 1554 void set_marking_started() { | |
| 1555 _mark_in_progress = true; | |
| 1556 } | |
| 1557 bool mark_in_progress() { | |
| 1558 return _mark_in_progress; | |
| 1559 } | |
| 1560 | |
| 1561 // Print the maximum heap capacity. | |
| 1562 virtual size_t max_capacity() const; | |
| 1563 | |
| 1564 virtual jlong millis_since_last_gc(); | |
| 1565 | |
|
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1566 |
| 342 | 1567 // Convenience function to be used in situations where the heap type can be |
| 1568 // asserted to be this type. | |
| 1569 static G1CollectedHeap* heap(); | |
| 1570 | |
| 1571 void set_region_short_lived_locked(HeapRegion* hr); | |
| 1572 // add appropriate methods for any other surv rate groups | |
| 1573 | |
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1574 YoungList* young_list() { return _young_list; } |
| 342 | 1575 |
| 1576 // debugging | |
| 1577 bool check_young_list_well_formed() { | |
| 1578 return _young_list->check_list_well_formed(); | |
| 1579 } | |
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1580 |
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1581 bool check_young_list_empty(bool check_heap, |
| 342 | 1582 bool check_sample = true); |
| 1583 | |
| 1584 // *** Stuff related to concurrent marking. It's not clear to me that so | |
| 1585 // many of these need to be public. | |
| 1586 | |
| 1587 // The functions below are helper functions that a subclass of | |
| 1588 // "CollectedHeap" can use in the implementation of its virtual | |
| 1589 // functions. | |
| 1590 // This performs a concurrent marking of the live objects in a | |
| 1591 // bitmap off to the side. | |
| 1592 void doConcurrentMark(); | |
| 1593 | |
| 1594 bool isMarkedPrev(oop obj) const; | |
| 1595 bool isMarkedNext(oop obj) const; | |
| 1596 | |
| 1597 // Determine if an object is dead, given the object and also | |
| 1598 // the region to which the object belongs. An object is dead | |
| 1599 // iff a) it was not allocated since the last mark and b) it | |
| 1600 // is not marked. | |
| 1601 | |
| 1602 bool is_obj_dead(const oop obj, const HeapRegion* hr) const { | |
| 1603 return | |
| 1604 !hr->obj_allocated_since_prev_marking(obj) && | |
| 1605 !isMarkedPrev(obj); | |
| 1606 } | |
| 1607 | |
| 1608 // This function returns true when an object has been | |
| 1609 // around since the previous marking and hasn't yet | |
| 1610 // been marked during this marking. | |
| 1611 | |
| 1612 bool is_obj_ill(const oop obj, const HeapRegion* hr) const { | |
| 1613 return | |
| 1614 !hr->obj_allocated_since_next_marking(obj) && | |
| 1615 !isMarkedNext(obj); | |
| 1616 } | |
| 1617 | |
| 1618 // Determine if an object is dead, given only the object itself. | |
| 1619 // This will find the region to which the object belongs and | |
| 1620 // then call the region version of the same function. | |
| 1621 | |
| 1622 // Added if it is NULL it isn't dead. | |
| 1623 | |
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1624 bool is_obj_dead(const oop obj) const { |
| 811 | 1625 const HeapRegion* hr = heap_region_containing(obj); |
| 342 | 1626 if (hr == NULL) { |
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1627 if (obj == NULL) return false; |
| 342 | 1628 else return true; |
| 1629 } | |
| 1630 else return is_obj_dead(obj, hr); | |
| 1631 } | |
| 1632 | |
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1633 bool is_obj_ill(const oop obj) const { |
| 811 | 1634 const HeapRegion* hr = heap_region_containing(obj); |
| 342 | 1635 if (hr == NULL) { |
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1636 if (obj == NULL) return false; |
| 342 | 1637 else return true; |
| 1638 } | |
| 1639 else return is_obj_ill(obj, hr); | |
| 1640 } | |
| 1641 | |
| 12080 | 1642 bool allocated_since_marking(oop obj, HeapRegion* hr, VerifyOption vo); |
| 1643 HeapWord* top_at_mark_start(HeapRegion* hr, VerifyOption vo); | |
| 1644 bool is_marked(oop obj, VerifyOption vo); | |
| 1645 const char* top_at_mark_start_str(VerifyOption vo); | |
| 1646 | |
| 1647 ConcurrentMark* concurrent_mark() const { return _cm; } | |
| 1648 | |
| 1649 // Refinement | |
| 1650 | |
| 1651 ConcurrentG1Refine* concurrent_g1_refine() const { return _cg1r; } | |
| 1652 | |
| 1653 // The dirty cards region list is used to record a subset of regions | |
| 1654 // whose cards need clearing. The list if populated during the | |
| 1655 // remembered set scanning and drained during the card table | |
| 1656 // cleanup. Although the methods are reentrant, population/draining | |
| 1657 // phases must not overlap. For synchronization purposes the last | |
| 1658 // element on the list points to itself. | |
| 1659 HeapRegion* _dirty_cards_region_list; | |
| 1660 void push_dirty_cards_region(HeapRegion* hr); | |
| 1661 HeapRegion* pop_dirty_cards_region(); | |
| 1662 | |
| 1663 // Optimized nmethod scanning support routines | |
| 1664 | |
| 1665 // Register the given nmethod with the G1 heap | |
| 1666 virtual void register_nmethod(nmethod* nm); | |
| 1667 | |
| 1668 // Unregister the given nmethod from the G1 heap | |
| 1669 virtual void unregister_nmethod(nmethod* nm); | |
| 1670 | |
| 1671 // Migrate the nmethods in the code root lists of the regions | |
| 1672 // in the collection set to regions in to-space. In the event | |
| 1673 // of an evacuation failure, nmethods that reference objects | |
| 1674 // that were not successfullly evacuated are not migrated. | |
| 1675 void migrate_strong_code_roots(); | |
| 1676 | |
| 1677 // During an initial mark pause, mark all the code roots that | |
| 1678 // point into regions *not* in the collection set. | |
| 1679 void mark_strong_code_roots(uint worker_id); | |
| 1680 | |
| 1681 // Rebuild the stong code root lists for each region | |
| 1682 // after a full GC | |
| 1683 void rebuild_strong_code_roots(); | |
| 1684 | |
| 1685 // Verification | |
| 1686 | |
| 1687 // The following is just to alert the verification code | |
| 1688 // that a full collection has occurred and that the | |
| 1689 // remembered sets are no longer up to date. | |
| 1690 bool _full_collection; | |
| 1691 void set_full_collection() { _full_collection = true;} | |
| 1692 void clear_full_collection() {_full_collection = false;} | |
| 1693 bool full_collection() {return _full_collection;} | |
| 1694 | |
| 1695 // Perform any cleanup actions necessary before allowing a verification. | |
| 1696 virtual void prepare_for_verify(); | |
| 1697 | |
| 1698 // Perform verification. | |
| 1699 | |
| 1700 // vo == UsePrevMarking -> use "prev" marking information, | |
| 1701 // vo == UseNextMarking -> use "next" marking information | |
| 1702 // vo == UseMarkWord -> use the mark word in the object header | |
| 1703 // | |
| 1704 // NOTE: Only the "prev" marking information is guaranteed to be | |
| 1705 // consistent most of the time, so most calls to this should use | |
| 1706 // vo == UsePrevMarking. | |
| 1707 // Currently, there is only one case where this is called with | |
| 1708 // vo == UseNextMarking, which is to verify the "next" marking | |
| 1709 // information at the end of remark. | |
| 1710 // Currently there is only one place where this is called with | |
| 1711 // vo == UseMarkWord, which is to verify the marking during a | |
| 1712 // full GC. | |
| 1713 void verify(bool silent, VerifyOption vo); | |
| 1714 | |
| 1715 // Override; it uses the "prev" marking information | |
| 1716 virtual void verify(bool silent); | |
| 1717 | |
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1718 // The methods below are here for convenience and dispatch the |
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1719 // appropriate method depending on value of the given VerifyOption |
| 12080 | 1720 // parameter. The values for that parameter, and their meanings, |
| 1721 // are the same as those above. | |
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1722 |
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1723 bool is_obj_dead_cond(const oop obj, |
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1724 const HeapRegion* hr, |
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1725 const VerifyOption vo) const { |
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1726 switch (vo) { |
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1727 case VerifyOption_G1UsePrevMarking: return is_obj_dead(obj, hr); |
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1728 case VerifyOption_G1UseNextMarking: return is_obj_ill(obj, hr); |
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1729 case VerifyOption_G1UseMarkWord: return !obj->is_gc_marked(); |
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1730 default: ShouldNotReachHere(); |
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1731 } |
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1732 return false; // keep some compilers happy |
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1733 } |
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1734 |
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1735 bool is_obj_dead_cond(const oop obj, |
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1736 const VerifyOption vo) const { |
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1737 switch (vo) { |
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1738 case VerifyOption_G1UsePrevMarking: return is_obj_dead(obj); |
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1739 case VerifyOption_G1UseNextMarking: return is_obj_ill(obj); |
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1740 case VerifyOption_G1UseMarkWord: return !obj->is_gc_marked(); |
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1741 default: ShouldNotReachHere(); |
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1742 } |
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1743 return false; // keep some compilers happy |
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1744 } |
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1745 |
| 12080 | 1746 // Printing |
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1747 |
| 12080 | 1748 virtual void print_on(outputStream* st) const; |
| 1749 virtual void print_extended_on(outputStream* st) const; | |
| 1750 virtual void print_on_error(outputStream* st) const; | |
| 342 | 1751 |
| 12080 | 1752 virtual void print_gc_threads_on(outputStream* st) const; |
| 1753 virtual void gc_threads_do(ThreadClosure* tc) const; | |
| 342 | 1754 |
| 12080 | 1755 // Override |
| 1756 void print_tracing_info() const; | |
| 1757 | |
| 1758 // The following two methods are helpful for debugging RSet issues. | |
| 1759 void print_cset_rsets() PRODUCT_RETURN; | |
| 1760 void print_all_rsets() PRODUCT_RETURN; | |
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1761 |
| 342 | 1762 public: |
| 1763 void stop_conc_gc_threads(); | |
| 1764 | |
| 1765 size_t pending_card_num(); | |
| 1766 size_t cards_scanned(); | |
| 1767 | |
| 1768 protected: | |
| 1769 size_t _max_heap_capacity; | |
| 1770 }; | |
| 1771 | |
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1772 class G1ParGCAllocBuffer: public ParGCAllocBuffer { |
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1773 private: |
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1774 bool _retired; |
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1775 |
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1776 public: |
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1777 G1ParGCAllocBuffer(size_t gclab_word_size); |
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1778 |
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1779 void set_buf(HeapWord* buf) { |
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1780 ParGCAllocBuffer::set_buf(buf); |
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1781 _retired = false; |
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1782 } |
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1783 |
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1784 void retire(bool end_of_gc, bool retain) { |
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1785 if (_retired) |
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1786 return; |
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1787 ParGCAllocBuffer::retire(end_of_gc, retain); |
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1788 _retired = true; |
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1789 } |
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1790 |
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1791 bool is_retired() { |
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1792 return _retired; |
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1793 } |
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1794 }; |
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1795 |
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1796 class G1ParGCAllocBufferContainer { |
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1797 protected: |
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1798 static int const _priority_max = 2; |
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1799 G1ParGCAllocBuffer* _priority_buffer[_priority_max]; |
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1800 |
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1801 public: |
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1802 G1ParGCAllocBufferContainer(size_t gclab_word_size) { |
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1803 for (int pr = 0; pr < _priority_max; ++pr) { |
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1804 _priority_buffer[pr] = new G1ParGCAllocBuffer(gclab_word_size); |
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1805 } |
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1806 } |
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1807 |
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1808 ~G1ParGCAllocBufferContainer() { |
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1809 for (int pr = 0; pr < _priority_max; ++pr) { |
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1810 assert(_priority_buffer[pr]->is_retired(), "alloc buffers should all retire at this point."); |
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1811 delete _priority_buffer[pr]; |
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1812 } |
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1813 } |
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1814 |
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1815 HeapWord* allocate(size_t word_sz) { |
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1816 HeapWord* obj; |
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1817 for (int pr = 0; pr < _priority_max; ++pr) { |
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1818 obj = _priority_buffer[pr]->allocate(word_sz); |
|
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1819 if (obj != NULL) return obj; |
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1820 } |
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1821 return obj; |
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1822 } |
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1823 |
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1824 bool contains(void* addr) { |
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1825 for (int pr = 0; pr < _priority_max; ++pr) { |
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1826 if (_priority_buffer[pr]->contains(addr)) return true; |
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1827 } |
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1828 return false; |
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1829 } |
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1830 |
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1831 void undo_allocation(HeapWord* obj, size_t word_sz) { |
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1832 bool finish_undo; |
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1833 for (int pr = 0; pr < _priority_max; ++pr) { |
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1834 if (_priority_buffer[pr]->contains(obj)) { |
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1835 _priority_buffer[pr]->undo_allocation(obj, word_sz); |
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1836 finish_undo = true; |
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1837 } |
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1838 } |
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1839 if (!finish_undo) ShouldNotReachHere(); |
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1840 } |
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1841 |
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1842 size_t words_remaining() { |
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1843 size_t result = 0; |
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1844 for (int pr = 0; pr < _priority_max; ++pr) { |
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1845 result += _priority_buffer[pr]->words_remaining(); |
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1846 } |
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1847 return result; |
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1848 } |
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1849 |
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1850 size_t words_remaining_in_retired_buffer() { |
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1851 G1ParGCAllocBuffer* retired = _priority_buffer[0]; |
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1852 return retired->words_remaining(); |
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1853 } |
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1854 |
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1855 void flush_stats_and_retire(PLABStats* stats, bool end_of_gc, bool retain) { |
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1856 for (int pr = 0; pr < _priority_max; ++pr) { |
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1857 _priority_buffer[pr]->flush_stats_and_retire(stats, end_of_gc, retain); |
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1858 } |
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1859 } |
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1860 |
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1861 void update(bool end_of_gc, bool retain, HeapWord* buf, size_t word_sz) { |
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1862 G1ParGCAllocBuffer* retired_and_set = _priority_buffer[0]; |
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1863 retired_and_set->retire(end_of_gc, retain); |
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1864 retired_and_set->set_buf(buf); |
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1865 retired_and_set->set_word_size(word_sz); |
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1866 adjust_priority_order(); |
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1867 } |
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1868 |
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1869 private: |
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1870 void adjust_priority_order() { |
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1871 G1ParGCAllocBuffer* retired_and_set = _priority_buffer[0]; |
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1872 |
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1873 int last = _priority_max - 1; |
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1874 for (int pr = 0; pr < last; ++pr) { |
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1875 _priority_buffer[pr] = _priority_buffer[pr + 1]; |
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1876 } |
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1877 _priority_buffer[last] = retired_and_set; |
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1878 } |
|
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1879 }; |
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1880 |
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1881 class G1ParScanThreadState : public StackObj { |
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1882 protected: |
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1883 G1CollectedHeap* _g1h; |
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1884 RefToScanQueue* _refs; |
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1885 DirtyCardQueue _dcq; |
| 12343 | 1886 G1SATBCardTableModRefBS* _ct_bs; |
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1887 G1RemSet* _g1_rem; |
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1888 |
|
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1889 G1ParGCAllocBufferContainer _surviving_alloc_buffer; |
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1890 G1ParGCAllocBufferContainer _tenured_alloc_buffer; |
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1891 G1ParGCAllocBufferContainer* _alloc_buffers[GCAllocPurposeCount]; |
|
1391
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1892 ageTable _age_table; |
|
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1893 |
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1894 size_t _alloc_buffer_waste; |
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1895 size_t _undo_waste; |
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1896 |
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1897 OopsInHeapRegionClosure* _evac_failure_cl; |
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1898 G1ParScanHeapEvacClosure* _evac_cl; |
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1899 G1ParScanPartialArrayClosure* _partial_scan_cl; |
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1900 |
| 10405 | 1901 int _hash_seed; |
|
4836
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1902 uint _queue_num; |
|
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1903 |
| 1611 | 1904 size_t _term_attempts; |
|
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1905 |
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1906 double _start; |
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1907 double _start_strong_roots; |
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1908 double _strong_roots_time; |
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1909 double _start_term; |
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1910 double _term_time; |
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1911 |
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1912 // Map from young-age-index (0 == not young, 1 is youngest) to |
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1913 // surviving words. base is what we get back from the malloc call |
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1914 size_t* _surviving_young_words_base; |
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1915 // this points into the array, as we use the first few entries for padding |
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1916 size_t* _surviving_young_words; |
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1917 |
| 1709 | 1918 #define PADDING_ELEM_NUM (DEFAULT_CACHE_LINE_SIZE / sizeof(size_t)) |
|
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1919 |
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1920 void add_to_alloc_buffer_waste(size_t waste) { _alloc_buffer_waste += waste; } |
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1921 |
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1922 void add_to_undo_waste(size_t waste) { _undo_waste += waste; } |
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1923 |
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1924 DirtyCardQueue& dirty_card_queue() { return _dcq; } |
| 12343 | 1925 G1SATBCardTableModRefBS* ctbs() { return _ct_bs; } |
|
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1926 |
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1927 template <class T> void immediate_rs_update(HeapRegion* from, T* p, int tid) { |
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1928 if (!from->is_survivor()) { |
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1929 _g1_rem->par_write_ref(from, p, tid); |
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1930 } |
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1931 } |
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1932 |
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1933 template <class T> void deferred_rs_update(HeapRegion* from, T* p, int tid) { |
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1934 // If the new value of the field points to the same region or |
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1935 // is the to-space, we don't need to include it in the Rset updates. |
|
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1936 if (!from->is_in_reserved(oopDesc::load_decode_heap_oop(p)) && !from->is_survivor()) { |
|
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1937 size_t card_index = ctbs()->index_for(p); |
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1938 // If the card hasn't been added to the buffer, do it. |
|
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1939 if (ctbs()->mark_card_deferred(card_index)) { |
|
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1940 dirty_card_queue().enqueue((jbyte*)ctbs()->byte_for_index(card_index)); |
|
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1941 } |
|
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1942 } |
|
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1943 } |
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1944 |
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1945 public: |
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1946 G1ParScanThreadState(G1CollectedHeap* g1h, uint queue_num); |
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1947 |
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1948 ~G1ParScanThreadState() { |
| 6197 | 1949 FREE_C_HEAP_ARRAY(size_t, _surviving_young_words_base, mtGC); |
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1950 } |
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1951 |
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1952 RefToScanQueue* refs() { return _refs; } |
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1953 ageTable* age_table() { return &_age_table; } |
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1954 |
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1955 G1ParGCAllocBufferContainer* alloc_buffer(GCAllocPurpose purpose) { |
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1956 return _alloc_buffers[purpose]; |
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1957 } |
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1958 |
| 1709 | 1959 size_t alloc_buffer_waste() const { return _alloc_buffer_waste; } |
| 1960 size_t undo_waste() const { return _undo_waste; } | |
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1961 |
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1962 #ifdef ASSERT |
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1963 bool verify_ref(narrowOop* ref) const; |
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1964 bool verify_ref(oop* ref) const; |
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1965 bool verify_task(StarTask ref) const; |
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1966 #endif // ASSERT |
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1967 |
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1968 template <class T> void push_on_queue(T* ref) { |
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1969 assert(verify_ref(ref), "sanity"); |
| 1709 | 1970 refs()->push(ref); |
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1971 } |
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1972 |
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1973 template <class T> void update_rs(HeapRegion* from, T* p, int tid) { |
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1974 if (G1DeferredRSUpdate) { |
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1975 deferred_rs_update(from, p, tid); |
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1976 } else { |
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1977 immediate_rs_update(from, p, tid); |
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1978 } |
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1979 } |
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1980 |
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1981 HeapWord* allocate_slow(GCAllocPurpose purpose, size_t word_sz) { |
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1982 HeapWord* obj = NULL; |
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1983 size_t gclab_word_size = _g1h->desired_plab_sz(purpose); |
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1984 if (word_sz * 100 < gclab_word_size * ParallelGCBufferWastePct) { |
|
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1985 G1ParGCAllocBufferContainer* alloc_buf = alloc_buffer(purpose); |
|
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1986 |
|
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1987 HeapWord* buf = _g1h->par_allocate_during_gc(purpose, gclab_word_size); |
|
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1988 if (buf == NULL) return NULL; // Let caller handle allocation failure. |
|
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1989 |
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1990 add_to_alloc_buffer_waste(alloc_buf->words_remaining_in_retired_buffer()); |
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1991 alloc_buf->update(false /* end_of_gc */, false /* retain */, buf, gclab_word_size); |
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1992 |
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1993 obj = alloc_buf->allocate(word_sz); |
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1994 assert(obj != NULL, "buffer was definitely big enough..."); |
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1995 } else { |
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1996 obj = _g1h->par_allocate_during_gc(purpose, word_sz); |
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1997 } |
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1998 return obj; |
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1999 } |
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2000 |
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2001 HeapWord* allocate(GCAllocPurpose purpose, size_t word_sz) { |
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2002 HeapWord* obj = alloc_buffer(purpose)->allocate(word_sz); |
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2003 if (obj != NULL) return obj; |
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2004 return allocate_slow(purpose, word_sz); |
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2005 } |
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2006 |
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2007 void undo_allocation(GCAllocPurpose purpose, HeapWord* obj, size_t word_sz) { |
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2008 if (alloc_buffer(purpose)->contains(obj)) { |
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2009 assert(alloc_buffer(purpose)->contains(obj + word_sz - 1), |
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2010 "should contain whole object"); |
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2011 alloc_buffer(purpose)->undo_allocation(obj, word_sz); |
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2012 } else { |
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2013 CollectedHeap::fill_with_object(obj, word_sz); |
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2014 add_to_undo_waste(word_sz); |
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2015 } |
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2016 } |
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2017 |
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2018 void set_evac_failure_closure(OopsInHeapRegionClosure* evac_failure_cl) { |
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2019 _evac_failure_cl = evac_failure_cl; |
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2020 } |
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2021 OopsInHeapRegionClosure* evac_failure_closure() { |
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2022 return _evac_failure_cl; |
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2023 } |
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2024 |
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2025 void set_evac_closure(G1ParScanHeapEvacClosure* evac_cl) { |
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2026 _evac_cl = evac_cl; |
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2027 } |
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2028 |
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2029 void set_partial_scan_closure(G1ParScanPartialArrayClosure* partial_scan_cl) { |
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2030 _partial_scan_cl = partial_scan_cl; |
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2031 } |
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2032 |
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2033 int* hash_seed() { return &_hash_seed; } |
|
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2034 uint queue_num() { return _queue_num; } |
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2035 |
| 1709 | 2036 size_t term_attempts() const { return _term_attempts; } |
| 1611 | 2037 void note_term_attempt() { _term_attempts++; } |
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2038 |
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2039 void start_strong_roots() { |
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2040 _start_strong_roots = os::elapsedTime(); |
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2041 } |
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2042 void end_strong_roots() { |
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2043 _strong_roots_time += (os::elapsedTime() - _start_strong_roots); |
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2044 } |
| 1709 | 2045 double strong_roots_time() const { return _strong_roots_time; } |
|
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2046 |
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2047 void start_term_time() { |
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2048 note_term_attempt(); |
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2049 _start_term = os::elapsedTime(); |
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2050 } |
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2051 void end_term_time() { |
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2052 _term_time += (os::elapsedTime() - _start_term); |
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2053 } |
| 1709 | 2054 double term_time() const { return _term_time; } |
|
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2055 |
| 1709 | 2056 double elapsed_time() const { |
|
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2057 return os::elapsedTime() - _start; |
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2058 } |
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2059 |
| 1709 | 2060 static void |
| 2061 print_termination_stats_hdr(outputStream* const st = gclog_or_tty); | |
| 2062 void | |
| 2063 print_termination_stats(int i, outputStream* const st = gclog_or_tty) const; | |
| 2064 | |
|
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2065 size_t* surviving_young_words() { |
|
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2066 // We add on to hide entry 0 which accumulates surviving words for |
|
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2067 // age -1 regions (i.e. non-young ones) |
|
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2068 return _surviving_young_words; |
|
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2069 } |
|
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2070 |
|
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2071 void retire_alloc_buffers() { |
|
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2072 for (int ap = 0; ap < GCAllocPurposeCount; ++ap) { |
|
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2073 size_t waste = _alloc_buffers[ap]->words_remaining(); |
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2074 add_to_alloc_buffer_waste(waste); |
| 6595 | 2075 _alloc_buffers[ap]->flush_stats_and_retire(_g1h->stats_for_purpose((GCAllocPurpose)ap), |
| 2076 true /* end_of_gc */, | |
| 2077 false /* retain */); | |
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2078 } |
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2079 } |
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2080 |
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2081 template <class T> void deal_with_reference(T* ref_to_scan) { |
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2082 if (has_partial_array_mask(ref_to_scan)) { |
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2083 _partial_scan_cl->do_oop_nv(ref_to_scan); |
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2084 } else { |
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2085 // Note: we can use "raw" versions of "region_containing" because |
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2086 // "obj_to_scan" is definitely in the heap, and is not in a |
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2087 // humongous region. |
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2088 HeapRegion* r = _g1h->heap_region_containing_raw(ref_to_scan); |
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2089 _evac_cl->set_region(r); |
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2090 _evac_cl->do_oop_nv(ref_to_scan); |
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2091 } |
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2092 } |
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2093 |
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2094 void deal_with_reference(StarTask ref) { |
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2095 assert(verify_task(ref), "sanity"); |
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2096 if (ref.is_narrow()) { |
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2097 deal_with_reference((narrowOop*)ref); |
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2098 } else { |
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2099 deal_with_reference((oop*)ref); |
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2100 } |
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2101 } |
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2102 |
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2103 void trim_queue(); |
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2104 }; |
| 1972 | 2105 |
| 2106 #endif // SHARE_VM_GC_IMPLEMENTATION_G1_G1COLLECTEDHEAP_HPP |