Mercurial > hg > truffle
annotate src/share/vm/gc_implementation/g1/g1CollectedHeap.hpp @ 17844:8847586c9037
8016302: Change type of the number of GC workers to unsigned int (2)
Reviewed-by: tschatzl, jwilhelm
| author | vkempik |
|---|---|
| date | Thu, 03 Apr 2014 17:49:31 +0400 |
| parents | bfdf528be8e8 |
| children | 1772223a25a2 |
| rev | line source |
|---|---|
| 342 | 1 /* |
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2 * Copyright (c) 2001, 2014, 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" |
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37 #include "gc_implementation/g1/heapRegionSet.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; |
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75 class Ticks; |
| 342 | 76 |
| 6197 | 77 typedef OverflowTaskQueue<StarTask, mtGC> RefToScanQueue; |
| 78 typedef GenericTaskQueueSet<RefToScanQueue, mtGC> RefToScanQueueSet; | |
| 342 | 79 |
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80 typedef int RegionIdx_t; // needs to hold [ 0..max_regions() ) |
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81 typedef int CardIdx_t; // needs to hold [ 0..CardsPerRegion ) |
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82 |
| 342 | 83 enum GCAllocPurpose { |
| 84 GCAllocForTenured, | |
| 85 GCAllocForSurvived, | |
| 86 GCAllocPurposeCount | |
| 87 }; | |
| 88 | |
| 6197 | 89 class YoungList : public CHeapObj<mtGC> { |
| 342 | 90 private: |
| 91 G1CollectedHeap* _g1h; | |
| 92 | |
| 93 HeapRegion* _head; | |
| 94 | |
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95 HeapRegion* _survivor_head; |
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96 HeapRegion* _survivor_tail; |
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97 |
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98 HeapRegion* _curr; |
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99 |
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100 uint _length; |
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101 uint _survivor_length; |
| 342 | 102 |
| 103 size_t _last_sampled_rs_lengths; | |
| 104 size_t _sampled_rs_lengths; | |
| 105 | |
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106 void empty_list(HeapRegion* list); |
| 342 | 107 |
| 108 public: | |
| 109 YoungList(G1CollectedHeap* g1h); | |
| 110 | |
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111 void push_region(HeapRegion* hr); |
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112 void add_survivor_region(HeapRegion* hr); |
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113 |
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114 void empty_list(); |
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115 bool is_empty() { return _length == 0; } |
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116 uint length() { return _length; } |
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117 uint survivor_length() { return _survivor_length; } |
| 342 | 118 |
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119 // Currently we do not keep track of the used byte sum for the |
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120 // young list and the survivors and it'd be quite a lot of work to |
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121 // do so. When we'll eventually replace the young list with |
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122 // instances of HeapRegionLinkedList we'll get that for free. So, |
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123 // we'll report the more accurate information then. |
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124 size_t eden_used_bytes() { |
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125 assert(length() >= survivor_length(), "invariant"); |
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126 return (size_t) (length() - survivor_length()) * HeapRegion::GrainBytes; |
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127 } |
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128 size_t survivor_used_bytes() { |
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129 return (size_t) survivor_length() * HeapRegion::GrainBytes; |
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130 } |
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131 |
| 342 | 132 void rs_length_sampling_init(); |
| 133 bool rs_length_sampling_more(); | |
| 134 void rs_length_sampling_next(); | |
| 135 | |
| 136 void reset_sampled_info() { | |
| 137 _last_sampled_rs_lengths = 0; | |
| 138 } | |
| 139 size_t sampled_rs_lengths() { return _last_sampled_rs_lengths; } | |
| 140 | |
| 141 // for development purposes | |
| 142 void reset_auxilary_lists(); | |
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143 void clear() { _head = NULL; _length = 0; } |
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144 |
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145 void clear_survivors() { |
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146 _survivor_head = NULL; |
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147 _survivor_tail = NULL; |
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148 _survivor_length = 0; |
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149 } |
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150 |
| 342 | 151 HeapRegion* first_region() { return _head; } |
| 152 HeapRegion* first_survivor_region() { return _survivor_head; } | |
| 545 | 153 HeapRegion* last_survivor_region() { return _survivor_tail; } |
| 342 | 154 |
| 155 // debugging | |
| 156 bool check_list_well_formed(); | |
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157 bool check_list_empty(bool check_sample = true); |
| 342 | 158 void print(); |
| 159 }; | |
| 160 | |
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161 class MutatorAllocRegion : public G1AllocRegion { |
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162 protected: |
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163 virtual HeapRegion* allocate_new_region(size_t word_size, bool force); |
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164 virtual void retire_region(HeapRegion* alloc_region, size_t allocated_bytes); |
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165 public: |
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166 MutatorAllocRegion() |
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167 : G1AllocRegion("Mutator Alloc Region", false /* bot_updates */) { } |
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168 }; |
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169 |
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170 class SurvivorGCAllocRegion : public G1AllocRegion { |
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171 protected: |
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172 virtual HeapRegion* allocate_new_region(size_t word_size, bool force); |
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173 virtual void retire_region(HeapRegion* alloc_region, size_t allocated_bytes); |
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174 public: |
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175 SurvivorGCAllocRegion() |
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176 : G1AllocRegion("Survivor GC Alloc Region", false /* bot_updates */) { } |
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177 }; |
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178 |
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179 class OldGCAllocRegion : public G1AllocRegion { |
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180 protected: |
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181 virtual HeapRegion* allocate_new_region(size_t word_size, bool force); |
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182 virtual void retire_region(HeapRegion* alloc_region, size_t allocated_bytes); |
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183 public: |
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184 OldGCAllocRegion() |
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185 : G1AllocRegion("Old GC Alloc Region", true /* bot_updates */) { } |
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186 }; |
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187 |
| 12080 | 188 // The G1 STW is alive closure. |
| 189 // An instance is embedded into the G1CH and used as the | |
| 190 // (optional) _is_alive_non_header closure in the STW | |
| 191 // reference processor. It is also extensively used during | |
| 192 // reference processing during STW evacuation pauses. | |
| 193 class G1STWIsAliveClosure: public BoolObjectClosure { | |
| 194 G1CollectedHeap* _g1; | |
| 195 public: | |
| 196 G1STWIsAliveClosure(G1CollectedHeap* g1) : _g1(g1) {} | |
| 197 bool do_object_b(oop p); | |
| 198 }; | |
| 199 | |
| 342 | 200 class RefineCardTableEntryClosure; |
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201 |
| 342 | 202 class G1CollectedHeap : public SharedHeap { |
| 203 friend class VM_G1CollectForAllocation; | |
| 204 friend class VM_G1CollectFull; | |
| 205 friend class VM_G1IncCollectionPause; | |
| 206 friend class VMStructs; | |
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207 friend class MutatorAllocRegion; |
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208 friend class SurvivorGCAllocRegion; |
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209 friend class OldGCAllocRegion; |
| 342 | 210 |
| 211 // Closures used in implementation. | |
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212 template <G1Barrier barrier, bool do_mark_object> |
| 5987 | 213 friend class G1ParCopyClosure; |
| 342 | 214 friend class G1IsAliveClosure; |
| 215 friend class G1EvacuateFollowersClosure; | |
| 216 friend class G1ParScanThreadState; | |
| 217 friend class G1ParScanClosureSuper; | |
| 218 friend class G1ParEvacuateFollowersClosure; | |
| 219 friend class G1ParTask; | |
| 220 friend class G1FreeGarbageRegionClosure; | |
| 221 friend class RefineCardTableEntryClosure; | |
| 222 friend class G1PrepareCompactClosure; | |
| 223 friend class RegionSorter; | |
| 2152 | 224 friend class RegionResetter; |
| 342 | 225 friend class CountRCClosure; |
| 226 friend class EvacPopObjClosure; | |
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227 friend class G1ParCleanupCTTask; |
| 342 | 228 |
| 229 // Other related classes. | |
| 230 friend class G1MarkSweep; | |
| 231 | |
| 232 private: | |
| 233 // The one and only G1CollectedHeap, so static functions can find it. | |
| 234 static G1CollectedHeap* _g1h; | |
| 235 | |
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236 static size_t _humongous_object_threshold_in_words; |
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237 |
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238 // Storage for the G1 heap. |
| 342 | 239 VirtualSpace _g1_storage; |
| 240 MemRegion _g1_reserved; | |
| 241 | |
| 242 // The part of _g1_storage that is currently committed. | |
| 243 MemRegion _g1_committed; | |
| 244 | |
| 2152 | 245 // The master free list. It will satisfy all new region allocations. |
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246 FreeRegionList _free_list; |
| 2152 | 247 |
| 248 // The secondary free list which contains regions that have been | |
| 249 // freed up during the cleanup process. This will be appended to the | |
| 250 // master free list when appropriate. | |
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251 FreeRegionList _secondary_free_list; |
| 2152 | 252 |
| 4072 | 253 // It keeps track of the old regions. |
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254 HeapRegionSet _old_set; |
| 4072 | 255 |
| 2152 | 256 // It keeps track of the humongous regions. |
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257 HeapRegionSet _humongous_set; |
| 342 | 258 |
| 259 // The number of regions we could create by expansion. | |
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260 uint _expansion_regions; |
| 342 | 261 |
| 262 // The block offset table for the G1 heap. | |
| 263 G1BlockOffsetSharedArray* _bot_shared; | |
| 264 | |
| 4072 | 265 // Tears down the region sets / lists so that they are empty and the |
| 266 // regions on the heap do not belong to a region set / list. The | |
| 267 // only exception is the humongous set which we leave unaltered. If | |
| 268 // free_list_only is true, it will only tear down the master free | |
| 269 // list. It is called before a Full GC (free_list_only == false) or | |
| 270 // before heap shrinking (free_list_only == true). | |
| 271 void tear_down_region_sets(bool free_list_only); | |
| 272 | |
| 273 // Rebuilds the region sets / lists so that they are repopulated to | |
| 274 // reflect the contents of the heap. The only exception is the | |
| 275 // humongous set which was not torn down in the first place. If | |
| 276 // free_list_only is true, it will only rebuild the master free | |
| 277 // list. It is called after a Full GC (free_list_only == false) or | |
| 278 // after heap shrinking (free_list_only == true). | |
| 279 void rebuild_region_sets(bool free_list_only); | |
| 342 | 280 |
| 281 // The sequence of all heap regions in the heap. | |
| 3766 | 282 HeapRegionSeq _hrs; |
| 342 | 283 |
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284 // Alloc region used to satisfy mutator allocation requests. |
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285 MutatorAllocRegion _mutator_alloc_region; |
| 342 | 286 |
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287 // Alloc region used to satisfy allocation requests by the GC for |
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288 // survivor objects. |
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289 SurvivorGCAllocRegion _survivor_gc_alloc_region; |
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290 |
| 6595 | 291 // PLAB sizing policy for survivors. |
| 292 PLABStats _survivor_plab_stats; | |
| 293 | |
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294 // Alloc region used to satisfy allocation requests by the GC for |
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295 // old objects. |
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296 OldGCAllocRegion _old_gc_alloc_region; |
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297 |
| 6595 | 298 // PLAB sizing policy for tenured objects. |
| 299 PLABStats _old_plab_stats; | |
| 300 | |
| 301 PLABStats* stats_for_purpose(GCAllocPurpose purpose) { | |
| 302 PLABStats* stats = NULL; | |
| 303 | |
| 304 switch (purpose) { | |
| 305 case GCAllocForSurvived: | |
| 306 stats = &_survivor_plab_stats; | |
| 307 break; | |
| 308 case GCAllocForTenured: | |
| 309 stats = &_old_plab_stats; | |
| 310 break; | |
| 311 default: | |
| 312 assert(false, "unrecognized GCAllocPurpose"); | |
| 313 } | |
| 314 | |
| 315 return stats; | |
| 316 } | |
| 317 | |
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318 // The last old region we allocated to during the last GC. |
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319 // Typically, it is not full so we should re-use it during the next GC. |
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320 HeapRegion* _retained_old_gc_alloc_region; |
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321 |
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322 // It specifies whether we should attempt to expand the heap after a |
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323 // region allocation failure. If heap expansion fails we set this to |
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324 // false so that we don't re-attempt the heap expansion (it's likely |
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325 // that subsequent expansion attempts will also fail if one fails). |
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326 // Currently, it is only consulted during GC and it's reset at the |
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327 // start of each GC. |
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328 bool _expand_heap_after_alloc_failure; |
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329 |
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330 // It resets the mutator alloc region before new allocations can take place. |
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331 void init_mutator_alloc_region(); |
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332 |
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333 // It releases the mutator alloc region. |
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334 void release_mutator_alloc_region(); |
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335 |
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336 // It initializes the GC alloc regions at the start of a GC. |
| 10405 | 337 void init_gc_alloc_regions(EvacuationInfo& evacuation_info); |
| 342 | 338 |
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339 // It releases the GC alloc regions at the end of a GC. |
| 10405 | 340 void release_gc_alloc_regions(uint no_of_gc_workers, EvacuationInfo& evacuation_info); |
| 342 | 341 |
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342 // It does any cleanup that needs to be done on the GC alloc regions |
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343 // before a Full GC. |
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344 void abandon_gc_alloc_regions(); |
| 342 | 345 |
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346 // Helper for monitoring and management support. |
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347 G1MonitoringSupport* _g1mm; |
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348 |
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349 // Determines PLAB size for a particular allocation purpose. |
| 6595 | 350 size_t desired_plab_sz(GCAllocPurpose purpose); |
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351 |
| 342 | 352 // Outside of GC pauses, the number of bytes used in all regions other |
| 353 // than the current allocation region. | |
| 354 size_t _summary_bytes_used; | |
| 355 | |
| 526 | 356 // This is used for a quick test on whether a reference points into |
| 357 // the collection set or not. Basically, we have an array, with one | |
| 358 // byte per region, and that byte denotes whether the corresponding | |
| 359 // region is in the collection set or not. The entry corresponding | |
| 360 // the bottom of the heap, i.e., region 0, is pointed to by | |
| 361 // _in_cset_fast_test_base. The _in_cset_fast_test field has been | |
| 362 // biased so that it actually points to address 0 of the address | |
| 363 // space, to make the test as fast as possible (we can simply shift | |
| 364 // the address to address into it, instead of having to subtract the | |
| 365 // bottom of the heap from the address before shifting it; basically | |
| 366 // it works in the same way the card table works). | |
| 367 bool* _in_cset_fast_test; | |
| 368 | |
| 369 // The allocated array used for the fast test on whether a reference | |
| 370 // points into the collection set or not. This field is also used to | |
| 371 // free the array. | |
| 372 bool* _in_cset_fast_test_base; | |
| 373 | |
| 374 // The length of the _in_cset_fast_test_base array. | |
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375 uint _in_cset_fast_test_length; |
| 526 | 376 |
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377 volatile unsigned _gc_time_stamp; |
| 342 | 378 |
| 379 size_t* _surviving_young_words; | |
| 380 | |
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381 G1HRPrinter _hr_printer; |
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382 |
| 342 | 383 void setup_surviving_young_words(); |
| 384 void update_surviving_young_words(size_t* surv_young_words); | |
| 385 void cleanup_surviving_young_words(); | |
| 386 | |
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387 // It decides whether an explicit GC should start a concurrent cycle |
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388 // instead of doing a STW GC. Currently, a concurrent cycle is |
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389 // explicitly started if: |
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390 // (a) cause == _gc_locker and +GCLockerInvokesConcurrent, or |
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391 // (b) cause == _java_lang_system_gc and +ExplicitGCInvokesConcurrent. |
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392 // (c) cause == _g1_humongous_allocation |
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393 bool should_do_concurrent_full_gc(GCCause::Cause cause); |
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394 |
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395 // Keeps track of how many "old marking cycles" (i.e., Full GCs or |
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396 // concurrent cycles) we have started. |
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397 volatile unsigned int _old_marking_cycles_started; |
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398 |
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399 // Keeps track of how many "old marking cycles" (i.e., Full GCs or |
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400 // concurrent cycles) we have completed. |
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401 volatile unsigned int _old_marking_cycles_completed; |
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402 |
| 10405 | 403 bool _concurrent_cycle_started; |
| 404 | |
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405 // This is a non-product method that is helpful for testing. It is |
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406 // called at the end of a GC and artificially expands the heap by |
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407 // allocating a number of dead regions. This way we can induce very |
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408 // frequent marking cycles and stress the cleanup / concurrent |
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409 // cleanup code more (as all the regions that will be allocated by |
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410 // this method will be found dead by the marking cycle). |
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411 void allocate_dummy_regions() PRODUCT_RETURN; |
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412 |
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413 // Clear RSets after a compaction. It also resets the GC time stamps. |
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414 void clear_rsets_post_compaction(); |
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415 |
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416 // If the HR printer is active, dump the state of the regions in the |
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417 // heap after a compaction. |
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418 void print_hrs_post_compaction(); |
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419 |
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420 double verify(bool guard, const char* msg); |
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421 void verify_before_gc(); |
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422 void verify_after_gc(); |
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423 |
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424 void log_gc_header(); |
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425 void log_gc_footer(double pause_time_sec); |
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426 |
| 1973 | 427 // These are macros so that, if the assert fires, we get the correct |
| 428 // line number, file, etc. | |
| 429 | |
| 2361 | 430 #define heap_locking_asserts_err_msg(_extra_message_) \ |
| 2152 | 431 err_msg("%s : Heap_lock locked: %s, at safepoint: %s, is VM thread: %s", \ |
| 2361 | 432 (_extra_message_), \ |
| 2152 | 433 BOOL_TO_STR(Heap_lock->owned_by_self()), \ |
| 434 BOOL_TO_STR(SafepointSynchronize::is_at_safepoint()), \ | |
| 435 BOOL_TO_STR(Thread::current()->is_VM_thread())) | |
| 1973 | 436 |
| 437 #define assert_heap_locked() \ | |
| 438 do { \ | |
| 439 assert(Heap_lock->owned_by_self(), \ | |
| 440 heap_locking_asserts_err_msg("should be holding the Heap_lock")); \ | |
| 441 } while (0) | |
| 442 | |
| 2361 | 443 #define assert_heap_locked_or_at_safepoint(_should_be_vm_thread_) \ |
| 1973 | 444 do { \ |
| 445 assert(Heap_lock->owned_by_self() || \ | |
| 2152 | 446 (SafepointSynchronize::is_at_safepoint() && \ |
| 2361 | 447 ((_should_be_vm_thread_) == Thread::current()->is_VM_thread())), \ |
| 1973 | 448 heap_locking_asserts_err_msg("should be holding the Heap_lock or " \ |
| 449 "should be at a safepoint")); \ | |
| 450 } while (0) | |
| 451 | |
| 452 #define assert_heap_locked_and_not_at_safepoint() \ | |
| 453 do { \ | |
| 454 assert(Heap_lock->owned_by_self() && \ | |
| 455 !SafepointSynchronize::is_at_safepoint(), \ | |
| 456 heap_locking_asserts_err_msg("should be holding the Heap_lock and " \ | |
| 457 "should not be at a safepoint")); \ | |
| 458 } while (0) | |
| 459 | |
| 460 #define assert_heap_not_locked() \ | |
| 461 do { \ | |
| 462 assert(!Heap_lock->owned_by_self(), \ | |
| 463 heap_locking_asserts_err_msg("should not be holding the Heap_lock")); \ | |
| 464 } while (0) | |
| 465 | |
| 466 #define assert_heap_not_locked_and_not_at_safepoint() \ | |
| 467 do { \ | |
| 468 assert(!Heap_lock->owned_by_self() && \ | |
| 469 !SafepointSynchronize::is_at_safepoint(), \ | |
| 470 heap_locking_asserts_err_msg("should not be holding the Heap_lock and " \ | |
| 471 "should not be at a safepoint")); \ | |
| 472 } while (0) | |
| 473 | |
| 2361 | 474 #define assert_at_safepoint(_should_be_vm_thread_) \ |
| 1973 | 475 do { \ |
| 2152 | 476 assert(SafepointSynchronize::is_at_safepoint() && \ |
| 2361 | 477 ((_should_be_vm_thread_) == Thread::current()->is_VM_thread()), \ |
| 1973 | 478 heap_locking_asserts_err_msg("should be at a safepoint")); \ |
| 479 } while (0) | |
| 480 | |
| 481 #define assert_not_at_safepoint() \ | |
| 482 do { \ | |
| 483 assert(!SafepointSynchronize::is_at_safepoint(), \ | |
| 484 heap_locking_asserts_err_msg("should not be at a safepoint")); \ | |
| 485 } while (0) | |
| 486 | |
| 342 | 487 protected: |
| 488 | |
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489 // The young region list. |
| 342 | 490 YoungList* _young_list; |
| 491 | |
| 492 // The current policy object for the collector. | |
| 493 G1CollectorPolicy* _g1_policy; | |
| 494 | |
| 2152 | 495 // This is the second level of trying to allocate a new region. If |
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496 // new_region() didn't find a region on the free_list, this call will |
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497 // check whether there's anything available on the |
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498 // secondary_free_list and/or wait for more regions to appear on |
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499 // that list, if _free_regions_coming is set. |
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500 HeapRegion* new_region_try_secondary_free_list(bool is_old); |
| 342 | 501 |
| 2361 | 502 // Try to allocate a single non-humongous HeapRegion sufficient for |
| 503 // an allocation of the given word_size. If do_expand is true, | |
| 504 // attempt to expand the heap if necessary to satisfy the allocation | |
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505 // request. If the region is to be used as an old region or for a |
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506 // humongous object, set is_old to true. If not, to false. |
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507 HeapRegion* new_region(size_t word_size, bool is_old, bool do_expand); |
| 342 | 508 |
| 2361 | 509 // Attempt to satisfy a humongous allocation request of the given |
| 510 // size by finding a contiguous set of free regions of num_regions | |
| 511 // length and remove them from the master free list. Return the | |
| 3766 | 512 // index of the first region or G1_NULL_HRS_INDEX if the search |
| 513 // was unsuccessful. | |
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514 uint humongous_obj_allocate_find_first(uint num_regions, |
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515 size_t word_size); |
| 342 | 516 |
| 2361 | 517 // Initialize a contiguous set of free regions of length num_regions |
| 518 // and starting at index first so that they appear as a single | |
| 519 // humongous region. | |
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520 HeapWord* humongous_obj_allocate_initialize_regions(uint first, |
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521 uint num_regions, |
| 2361 | 522 size_t word_size); |
| 523 | |
| 524 // Attempt to allocate a humongous object of the given size. Return | |
| 525 // NULL if unsuccessful. | |
| 2152 | 526 HeapWord* humongous_obj_allocate(size_t word_size); |
| 1973 | 527 |
| 528 // The following two methods, allocate_new_tlab() and | |
| 529 // mem_allocate(), are the two main entry points from the runtime | |
| 530 // into the G1's allocation routines. They have the following | |
| 531 // assumptions: | |
| 532 // | |
| 533 // * They should both be called outside safepoints. | |
| 534 // | |
| 535 // * They should both be called without holding the Heap_lock. | |
| 536 // | |
| 537 // * All allocation requests for new TLABs should go to | |
| 538 // allocate_new_tlab(). | |
| 539 // | |
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540 // * All non-TLAB allocation requests should go to mem_allocate(). |
| 1973 | 541 // |
| 542 // * If either call cannot satisfy the allocation request using the | |
| 543 // current allocating region, they will try to get a new one. If | |
| 544 // this fails, they will attempt to do an evacuation pause and | |
| 545 // retry the allocation. | |
| 546 // | |
| 547 // * If all allocation attempts fail, even after trying to schedule | |
| 548 // an evacuation pause, allocate_new_tlab() will return NULL, | |
| 549 // whereas mem_allocate() will attempt a heap expansion and/or | |
| 550 // schedule a Full GC. | |
| 551 // | |
| 552 // * We do not allow humongous-sized TLABs. So, allocate_new_tlab | |
| 553 // should never be called with word_size being humongous. All | |
| 554 // humongous allocation requests should go to mem_allocate() which | |
| 555 // will satisfy them with a special path. | |
| 556 | |
| 557 virtual HeapWord* allocate_new_tlab(size_t word_size); | |
| 558 | |
| 559 virtual HeapWord* mem_allocate(size_t word_size, | |
| 560 bool* gc_overhead_limit_was_exceeded); | |
| 342 | 561 |
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562 // The following three methods take a gc_count_before_ret |
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563 // parameter which is used to return the GC count if the method |
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564 // returns NULL. Given that we are required to read the GC count |
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565 // while holding the Heap_lock, and these paths will take the |
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566 // Heap_lock at some point, it's easier to get them to read the GC |
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567 // count while holding the Heap_lock before they return NULL instead |
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568 // of the caller (namely: mem_allocate()) having to also take the |
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569 // Heap_lock just to read the GC count. |
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570 |
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571 // First-level mutator allocation attempt: try to allocate out of |
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572 // the mutator alloc region without taking the Heap_lock. This |
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573 // should only be used for non-humongous allocations. |
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574 inline HeapWord* attempt_allocation(size_t word_size, |
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575 unsigned int* gc_count_before_ret, |
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576 int* gclocker_retry_count_ret); |
| 342 | 577 |
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578 // Second-level mutator allocation attempt: take the Heap_lock and |
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579 // retry the allocation attempt, potentially scheduling a GC |
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580 // pause. This should only be used for non-humongous allocations. |
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581 HeapWord* attempt_allocation_slow(size_t word_size, |
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582 unsigned int* gc_count_before_ret, |
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583 int* gclocker_retry_count_ret); |
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584 |
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585 // Takes the Heap_lock and attempts a humongous allocation. It can |
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586 // potentially schedule a GC pause. |
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587 HeapWord* attempt_allocation_humongous(size_t word_size, |
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588 unsigned int* gc_count_before_ret, |
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589 int* gclocker_retry_count_ret); |
| 1973 | 590 |
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591 // Allocation attempt that should be called during safepoints (e.g., |
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592 // at the end of a successful GC). expect_null_mutator_alloc_region |
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593 // specifies whether the mutator alloc region is expected to be NULL |
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594 // or not. |
| 1973 | 595 HeapWord* attempt_allocation_at_safepoint(size_t word_size, |
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596 bool expect_null_mutator_alloc_region); |
| 1973 | 597 |
| 598 // It dirties the cards that cover the block so that so that the post | |
| 599 // write barrier never queues anything when updating objects on this | |
| 600 // block. It is assumed (and in fact we assert) that the block | |
| 601 // belongs to a young region. | |
| 602 inline void dirty_young_block(HeapWord* start, size_t word_size); | |
| 342 | 603 |
| 604 // Allocate blocks during garbage collection. Will ensure an | |
| 605 // allocation region, either by picking one or expanding the | |
| 606 // heap, and then allocate a block of the given size. The block | |
| 607 // may not be a humongous - it must fit into a single heap region. | |
| 608 HeapWord* par_allocate_during_gc(GCAllocPurpose purpose, size_t word_size); | |
| 609 | |
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610 HeapWord* allocate_during_gc_slow(GCAllocPurpose purpose, |
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611 HeapRegion* alloc_region, |
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612 bool par, |
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613 size_t word_size); |
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614 |
| 342 | 615 // Ensure that no further allocations can happen in "r", bearing in mind |
| 616 // that parallel threads might be attempting allocations. | |
| 617 void par_allocate_remaining_space(HeapRegion* r); | |
| 618 | |
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619 // Allocation attempt during GC for a survivor object / PLAB. |
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620 inline HeapWord* survivor_attempt_allocation(size_t word_size); |
| 545 | 621 |
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622 // Allocation attempt during GC for an old object / PLAB. |
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623 inline HeapWord* old_attempt_allocation(size_t word_size); |
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624 |
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625 // These methods are the "callbacks" from the G1AllocRegion class. |
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626 |
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627 // For mutator alloc regions. |
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628 HeapRegion* new_mutator_alloc_region(size_t word_size, bool force); |
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629 void retire_mutator_alloc_region(HeapRegion* alloc_region, |
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630 size_t allocated_bytes); |
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631 |
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632 // For GC alloc regions. |
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633 HeapRegion* new_gc_alloc_region(size_t word_size, uint count, |
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634 GCAllocPurpose ap); |
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635 void retire_gc_alloc_region(HeapRegion* alloc_region, |
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636 size_t allocated_bytes, GCAllocPurpose ap); |
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637 |
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638 // - if explicit_gc is true, the GC is for a System.gc() or a heap |
| 1973 | 639 // inspection request and should collect the entire heap |
| 640 // - if clear_all_soft_refs is true, all soft references should be | |
| 641 // cleared during the GC | |
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642 // - if explicit_gc is false, word_size describes the allocation that |
| 1973 | 643 // the GC should attempt (at least) to satisfy |
| 644 // - it returns false if it is unable to do the collection due to the | |
| 645 // GC locker being active, true otherwise | |
| 646 bool do_collection(bool explicit_gc, | |
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647 bool clear_all_soft_refs, |
| 342 | 648 size_t word_size); |
| 649 | |
| 650 // Callback from VM_G1CollectFull operation. | |
| 651 // Perform a full collection. | |
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652 virtual void do_full_collection(bool clear_all_soft_refs); |
| 342 | 653 |
| 654 // Resize the heap if necessary after a full collection. If this is | |
| 655 // after a collect-for allocation, "word_size" is the allocation size, | |
| 656 // and will be considered part of the used portion of the heap. | |
| 657 void resize_if_necessary_after_full_collection(size_t word_size); | |
| 658 | |
| 659 // Callback from VM_G1CollectForAllocation operation. | |
| 660 // This function does everything necessary/possible to satisfy a | |
| 661 // failed allocation request (including collection, expansion, etc.) | |
| 1973 | 662 HeapWord* satisfy_failed_allocation(size_t word_size, bool* succeeded); |
| 342 | 663 |
| 664 // Attempting to expand the heap sufficiently | |
| 665 // to support an allocation of the given "word_size". If | |
| 666 // successful, perform the allocation and return the address of the | |
| 667 // allocated block, or else "NULL". | |
| 1973 | 668 HeapWord* expand_and_allocate(size_t word_size); |
| 342 | 669 |
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670 // Process any reference objects discovered during |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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|
671 // an incremental evacuation pause. |
| 6819 | 672 void process_discovered_references(uint no_of_gc_workers); |
|
3979
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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|
673 |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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parents:
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diff
changeset
|
674 // Enqueue any remaining discovered references |
|
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parents:
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|
675 // after processing. |
| 6819 | 676 void enqueue_discovered_references(uint no_of_gc_workers); |
|
3979
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|
677 |
| 342 | 678 public: |
|
3289
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jmasa
parents:
3285
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|
679 |
|
3980
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7075646: G1: fix inconsistencies in the monitoring data
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3979
diff
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|
680 G1MonitoringSupport* g1mm() { |
|
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|
681 assert(_g1mm != NULL, "should have been initialized"); |
|
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diff
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|
682 return _g1mm; |
|
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diff
changeset
|
683 } |
|
3289
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parents:
3285
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|
684 |
| 342 | 685 // Expand the garbage-first heap by at least the given size (in bytes!). |
|
2188
c33825b68624
6923430: G1: assert(res != 0,"This should have worked.")
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|
686 // Returns true if the heap was expanded by the requested amount; |
|
c33825b68624
6923430: G1: assert(res != 0,"This should have worked.")
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|
687 // false otherwise. |
| 342 | 688 // (Rounds up to a HeapRegion boundary.) |
|
2188
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6923430: G1: assert(res != 0,"This should have worked.")
johnc
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|
689 bool expand(size_t expand_bytes); |
| 342 | 690 |
| 691 // Do anything common to GC's. | |
| 692 virtual void gc_prologue(bool full); | |
| 693 virtual void gc_epilogue(bool full); | |
| 694 | |
| 526 | 695 // We register a region with the fast "in collection set" test. We |
| 696 // simply set to true the array slot corresponding to this region. | |
| 697 void register_region_with_in_cset_fast_test(HeapRegion* r) { | |
| 698 assert(_in_cset_fast_test_base != NULL, "sanity"); | |
| 699 assert(r->in_collection_set(), "invariant"); | |
|
6010
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7157073: G1: type change size_t -> uint for region counts / indexes
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|
700 uint index = r->hrs_index(); |
| 3766 | 701 assert(index < _in_cset_fast_test_length, "invariant"); |
| 526 | 702 assert(!_in_cset_fast_test_base[index], "invariant"); |
| 703 _in_cset_fast_test_base[index] = true; | |
| 704 } | |
| 705 | |
| 706 // This is a fast test on whether a reference points into the | |
|
17688
2c2ae9e5f65d
8035326: Assume non-NULL references in G1CollectedHeap::in_cset_fast_test
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diff
changeset
|
707 // collection set or not. Assume that the reference |
|
2c2ae9e5f65d
8035326: Assume non-NULL references in G1CollectedHeap::in_cset_fast_test
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diff
changeset
|
708 // points into the heap. |
|
17833
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8038498: Fix includes and C inlining after 8035330
tschatzl
parents:
17773
diff
changeset
|
709 inline bool in_cset_fast_test(oop obj); |
| 526 | 710 |
|
1394
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6819061: G1: eliminate serial Other times that are proportional to the collection set length
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diff
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|
711 void clear_cset_fast_test() { |
|
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
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diff
changeset
|
712 assert(_in_cset_fast_test_base != NULL, "sanity"); |
|
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
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diff
changeset
|
713 memset(_in_cset_fast_test_base, false, |
|
6010
720b6a76dd9d
7157073: G1: type change size_t -> uint for region counts / indexes
tonyp
parents:
6008
diff
changeset
|
714 (size_t) _in_cset_fast_test_length * sizeof(bool)); |
|
1394
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
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diff
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|
715 } |
|
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
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diff
changeset
|
716 |
|
6120
37552638d24a
7172388: G1: _total_full_collections should not be incremented for concurrent cycles
brutisso
parents:
6010
diff
changeset
|
717 // This is called at the start of either a concurrent cycle or a Full |
|
37552638d24a
7172388: G1: _total_full_collections should not be incremented for concurrent cycles
brutisso
parents:
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diff
changeset
|
718 // GC to update the number of old marking cycles started. |
|
37552638d24a
7172388: G1: _total_full_collections should not be incremented for concurrent cycles
brutisso
parents:
6010
diff
changeset
|
719 void increment_old_marking_cycles_started(); |
|
37552638d24a
7172388: G1: _total_full_collections should not be incremented for concurrent cycles
brutisso
parents:
6010
diff
changeset
|
720 |
|
1656
4e5661ba9d98
6944166: G1: explicit GCs are not always handled correctly
tonyp
parents:
1611
diff
changeset
|
721 // This is called at the end of either a concurrent cycle or a Full |
|
6120
37552638d24a
7172388: G1: _total_full_collections should not be incremented for concurrent cycles
brutisso
parents:
6010
diff
changeset
|
722 // GC to update the number of old marking cycles completed. Those two |
|
1656
4e5661ba9d98
6944166: G1: explicit GCs are not always handled correctly
tonyp
parents:
1611
diff
changeset
|
723 // can happen in a nested fashion, i.e., we start a concurrent |
|
4e5661ba9d98
6944166: G1: explicit GCs are not always handled correctly
tonyp
parents:
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diff
changeset
|
724 // cycle, a Full GC happens half-way through it which ends first, |
|
4e5661ba9d98
6944166: G1: explicit GCs are not always handled correctly
tonyp
parents:
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diff
changeset
|
725 // and then the cycle notices that a Full GC happened and ends |
|
2030
fb712ff22571
7000559: G1: assertion failure !outer || (full_collections_started == _full_collections_completed + 1)
tonyp
parents:
1991
diff
changeset
|
726 // too. The concurrent parameter is a boolean to help us do a bit |
|
fb712ff22571
7000559: G1: assertion failure !outer || (full_collections_started == _full_collections_completed + 1)
tonyp
parents:
1991
diff
changeset
|
727 // tighter consistency checking in the method. If concurrent is |
|
fb712ff22571
7000559: G1: assertion failure !outer || (full_collections_started == _full_collections_completed + 1)
tonyp
parents:
1991
diff
changeset
|
728 // false, the caller is the inner caller in the nesting (i.e., the |
|
fb712ff22571
7000559: G1: assertion failure !outer || (full_collections_started == _full_collections_completed + 1)
tonyp
parents:
1991
diff
changeset
|
729 // Full GC). If concurrent is true, the caller is the outer caller |
|
fb712ff22571
7000559: G1: assertion failure !outer || (full_collections_started == _full_collections_completed + 1)
tonyp
parents:
1991
diff
changeset
|
730 // in this nesting (i.e., the concurrent cycle). Further nesting is |
|
6120
37552638d24a
7172388: G1: _total_full_collections should not be incremented for concurrent cycles
brutisso
parents:
6010
diff
changeset
|
731 // not currently supported. The end of this call also notifies |
|
2030
fb712ff22571
7000559: G1: assertion failure !outer || (full_collections_started == _full_collections_completed + 1)
tonyp
parents:
1991
diff
changeset
|
732 // the FullGCCount_lock in case a Java thread is waiting for a full |
|
fb712ff22571
7000559: G1: assertion failure !outer || (full_collections_started == _full_collections_completed + 1)
tonyp
parents:
1991
diff
changeset
|
733 // GC to happen (e.g., it called System.gc() with |
|
1656
4e5661ba9d98
6944166: G1: explicit GCs are not always handled correctly
tonyp
parents:
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diff
changeset
|
734 // +ExplicitGCInvokesConcurrent). |
|
6120
37552638d24a
7172388: G1: _total_full_collections should not be incremented for concurrent cycles
brutisso
parents:
6010
diff
changeset
|
735 void increment_old_marking_cycles_completed(bool concurrent); |
|
1656
4e5661ba9d98
6944166: G1: explicit GCs are not always handled correctly
tonyp
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diff
changeset
|
736 |
|
6120
37552638d24a
7172388: G1: _total_full_collections should not be incremented for concurrent cycles
brutisso
parents:
6010
diff
changeset
|
737 unsigned int old_marking_cycles_completed() { |
|
37552638d24a
7172388: G1: _total_full_collections should not be incremented for concurrent cycles
brutisso
parents:
6010
diff
changeset
|
738 return _old_marking_cycles_completed; |
|
1656
4e5661ba9d98
6944166: G1: explicit GCs are not always handled correctly
tonyp
parents:
1611
diff
changeset
|
739 } |
|
4e5661ba9d98
6944166: G1: explicit GCs are not always handled correctly
tonyp
parents:
1611
diff
changeset
|
740 |
|
13400
86e6d691f2e1
8028128: Add a type safe alternative for working with counter based data
mgronlun
parents:
12352
diff
changeset
|
741 void register_concurrent_cycle_start(const Ticks& start_time); |
| 10405 | 742 void register_concurrent_cycle_end(); |
| 743 void trace_heap_after_concurrent_cycle(); | |
| 744 | |
| 745 G1YCType yc_type(); | |
| 746 | |
|
3778
5f6f2615433a
7049999: G1: Make the G1PrintHeapRegions output consistent and complete
tonyp
parents:
3777
diff
changeset
|
747 G1HRPrinter* hr_printer() { return &_hr_printer; } |
|
5f6f2615433a
7049999: G1: Make the G1PrintHeapRegions output consistent and complete
tonyp
parents:
3777
diff
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|
748 |
|
17736
58fc1b1523dc
8034079: G1: Refactor the HeapRegionSet hierarchy
brutisso
parents:
17727
diff
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|
749 // Frees a non-humongous region by initializing its contents and |
|
58fc1b1523dc
8034079: G1: Refactor the HeapRegionSet hierarchy
brutisso
parents:
17727
diff
changeset
|
750 // adding it to the free list that's passed as a parameter (this is |
|
58fc1b1523dc
8034079: G1: Refactor the HeapRegionSet hierarchy
brutisso
parents:
17727
diff
changeset
|
751 // usually a local list which will be appended to the master free |
|
58fc1b1523dc
8034079: G1: Refactor the HeapRegionSet hierarchy
brutisso
parents:
17727
diff
changeset
|
752 // list later). The used bytes of freed regions are accumulated in |
|
58fc1b1523dc
8034079: G1: Refactor the HeapRegionSet hierarchy
brutisso
parents:
17727
diff
changeset
|
753 // pre_used. If par is true, the region's RSet will not be freed |
|
58fc1b1523dc
8034079: G1: Refactor the HeapRegionSet hierarchy
brutisso
parents:
17727
diff
changeset
|
754 // up. The assumption is that this will be done later. |
|
17755
96b1c2e06e25
8027295: Free CSet takes ~50% of young pause time
tschatzl
parents:
17753
diff
changeset
|
755 // The locked parameter indicates if the caller has already taken |
|
96b1c2e06e25
8027295: Free CSet takes ~50% of young pause time
tschatzl
parents:
17753
diff
changeset
|
756 // care of proper synchronization. This may allow some optimizations. |
|
17736
58fc1b1523dc
8034079: G1: Refactor the HeapRegionSet hierarchy
brutisso
parents:
17727
diff
changeset
|
757 void free_region(HeapRegion* hr, |
|
58fc1b1523dc
8034079: G1: Refactor the HeapRegionSet hierarchy
brutisso
parents:
17727
diff
changeset
|
758 FreeRegionList* free_list, |
|
17755
96b1c2e06e25
8027295: Free CSet takes ~50% of young pause time
tschatzl
parents:
17753
diff
changeset
|
759 bool par, |
|
96b1c2e06e25
8027295: Free CSet takes ~50% of young pause time
tschatzl
parents:
17753
diff
changeset
|
760 bool locked = false); |
|
17736
58fc1b1523dc
8034079: G1: Refactor the HeapRegionSet hierarchy
brutisso
parents:
17727
diff
changeset
|
761 |
|
58fc1b1523dc
8034079: G1: Refactor the HeapRegionSet hierarchy
brutisso
parents:
17727
diff
changeset
|
762 // Frees a humongous region by collapsing it into individual regions |
|
58fc1b1523dc
8034079: G1: Refactor the HeapRegionSet hierarchy
brutisso
parents:
17727
diff
changeset
|
763 // and calling free_region() for each of them. The freed regions |
|
58fc1b1523dc
8034079: G1: Refactor the HeapRegionSet hierarchy
brutisso
parents:
17727
diff
changeset
|
764 // will be added to the free list that's passed as a parameter (this |
|
58fc1b1523dc
8034079: G1: Refactor the HeapRegionSet hierarchy
brutisso
parents:
17727
diff
changeset
|
765 // is usually a local list which will be appended to the master free |
|
58fc1b1523dc
8034079: G1: Refactor the HeapRegionSet hierarchy
brutisso
parents:
17727
diff
changeset
|
766 // list later). The used bytes of freed regions are accumulated in |
|
58fc1b1523dc
8034079: G1: Refactor the HeapRegionSet hierarchy
brutisso
parents:
17727
diff
changeset
|
767 // pre_used. If par is true, the region's RSet will not be freed |
|
58fc1b1523dc
8034079: G1: Refactor the HeapRegionSet hierarchy
brutisso
parents:
17727
diff
changeset
|
768 // up. The assumption is that this will be done later. |
|
58fc1b1523dc
8034079: G1: Refactor the HeapRegionSet hierarchy
brutisso
parents:
17727
diff
changeset
|
769 void free_humongous_region(HeapRegion* hr, |
|
58fc1b1523dc
8034079: G1: Refactor the HeapRegionSet hierarchy
brutisso
parents:
17727
diff
changeset
|
770 FreeRegionList* free_list, |
|
58fc1b1523dc
8034079: G1: Refactor the HeapRegionSet hierarchy
brutisso
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diff
changeset
|
771 bool par); |
| 342 | 772 protected: |
| 773 | |
| 774 // Shrink the garbage-first heap by at most the given size (in bytes!). | |
| 775 // (Rounds down to a HeapRegion boundary.) | |
| 776 virtual void shrink(size_t expand_bytes); | |
| 777 void shrink_helper(size_t expand_bytes); | |
| 778 | |
| 1709 | 779 #if TASKQUEUE_STATS |
| 780 static void print_taskqueue_stats_hdr(outputStream* const st = gclog_or_tty); | |
| 781 void print_taskqueue_stats(outputStream* const st = gclog_or_tty) const; | |
| 782 void reset_taskqueue_stats(); | |
| 783 #endif // TASKQUEUE_STATS | |
| 784 | |
| 1973 | 785 // Schedule the VM operation that will do an evacuation pause to |
| 786 // satisfy an allocation request of word_size. *succeeded will | |
| 787 // return whether the VM operation was successful (it did do an | |
| 788 // evacuation pause) or not (another thread beat us to it or the GC | |
| 789 // locker was active). Given that we should not be holding the | |
| 790 // Heap_lock when we enter this method, we will pass the | |
| 791 // gc_count_before (i.e., total_collections()) as a parameter since | |
| 792 // it has to be read while holding the Heap_lock. Currently, both | |
| 793 // methods that call do_collection_pause() release the Heap_lock | |
| 794 // before the call, so it's easy to read gc_count_before just before. | |
|
12113
f7d3b4387a16
8022872: G1: Use correct GC cause for young GC triggered by humongous allocations
brutisso
parents:
12080
diff
changeset
|
795 HeapWord* do_collection_pause(size_t word_size, |
|
f7d3b4387a16
8022872: G1: Use correct GC cause for young GC triggered by humongous allocations
brutisso
parents:
12080
diff
changeset
|
796 unsigned int gc_count_before, |
|
f7d3b4387a16
8022872: G1: Use correct GC cause for young GC triggered by humongous allocations
brutisso
parents:
12080
diff
changeset
|
797 bool* succeeded, |
|
f7d3b4387a16
8022872: G1: Use correct GC cause for young GC triggered by humongous allocations
brutisso
parents:
12080
diff
changeset
|
798 GCCause::Cause gc_cause); |
| 342 | 799 |
| 800 // The guts of the incremental collection pause, executed by the vm | |
| 1973 | 801 // thread. It returns false if it is unable to do the collection due |
| 802 // to the GC locker being active, true otherwise | |
| 803 bool do_collection_pause_at_safepoint(double target_pause_time_ms); | |
| 342 | 804 |
| 805 // Actually do the work of evacuating the collection set. | |
| 10405 | 806 void evacuate_collection_set(EvacuationInfo& evacuation_info); |
| 342 | 807 |
| 808 // The g1 remembered set of the heap. | |
| 809 G1RemSet* _g1_rem_set; | |
| 810 | |
|
616
4f360ec815ba
6720309: G1: don't synchronously update RSet during evacuation pauses
iveresov
parents:
545
diff
changeset
|
811 // A set of cards that cover the objects for which the Rsets should be updated |
|
4f360ec815ba
6720309: G1: don't synchronously update RSet during evacuation pauses
iveresov
parents:
545
diff
changeset
|
812 // concurrently after the collection. |
|
4f360ec815ba
6720309: G1: don't synchronously update RSet during evacuation pauses
iveresov
parents:
545
diff
changeset
|
813 DirtyCardQueueSet _dirty_card_queue_set; |
|
4f360ec815ba
6720309: G1: don't synchronously update RSet during evacuation pauses
iveresov
parents:
545
diff
changeset
|
814 |
| 342 | 815 // The closure used to refine a single card. |
| 816 RefineCardTableEntryClosure* _refine_cte_cl; | |
| 817 | |
| 818 // A function to check the consistency of dirty card logs. | |
| 819 void check_ct_logs_at_safepoint(); | |
| 820 | |
| 1705 | 821 // A DirtyCardQueueSet that is used to hold cards that contain |
| 822 // references into the current collection set. This is used to | |
| 823 // update the remembered sets of the regions in the collection | |
| 824 // set in the event of an evacuation failure. | |
| 825 DirtyCardQueueSet _into_cset_dirty_card_queue_set; | |
| 826 | |
| 342 | 827 // After a collection pause, make the regions in the CS into free |
| 828 // regions. | |
| 10405 | 829 void free_collection_set(HeapRegion* cs_head, EvacuationInfo& evacuation_info); |
| 342 | 830 |
|
1394
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
831 // Abandon the current collection set without recording policy |
|
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
832 // statistics or updating free lists. |
|
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
833 void abandon_collection_set(HeapRegion* cs_head); |
|
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
834 |
| 342 | 835 // Applies "scan_non_heap_roots" to roots outside the heap, |
| 836 // "scan_rs" to roots inside the heap (having done "set_region" to | |
|
6725
da91efe96a93
6964458: Reimplement class meta-data storage to use native memory
coleenp
parents:
6629
diff
changeset
|
837 // indicate the region in which the root resides), |
|
da91efe96a93
6964458: Reimplement class meta-data storage to use native memory
coleenp
parents:
6629
diff
changeset
|
838 // and does "scan_metadata" If "scan_rs" is |
| 342 | 839 // NULL, then this step is skipped. The "worker_i" |
| 840 // param is for use with parallel roots processing, and should be | |
| 841 // the "i" of the calling parallel worker thread's work(i) function. | |
| 842 // In the sequential case this param will be ignored. | |
|
6725
da91efe96a93
6964458: Reimplement class meta-data storage to use native memory
coleenp
parents:
6629
diff
changeset
|
843 void g1_process_strong_roots(bool is_scavenging, |
|
4910
caa4652b4414
7129892: G1: explicit marking cycle initiation might fail to initiate a marking cycle
tonyp
parents:
4836
diff
changeset
|
844 ScanningOption so, |
| 342 | 845 OopClosure* scan_non_heap_roots, |
| 846 OopsInHeapRegionClosure* scan_rs, | |
|
6725
da91efe96a93
6964458: Reimplement class meta-data storage to use native memory
coleenp
parents:
6629
diff
changeset
|
847 G1KlassScanClosure* scan_klasses, |
|
17844
8847586c9037
8016302: Change type of the number of GC workers to unsigned int (2)
vkempik
parents:
17833
diff
changeset
|
848 uint worker_i); |
| 342 | 849 |
| 850 // Apply "blk" to all the weak roots of the system. These include | |
| 851 // JNI weak roots, the code cache, system dictionary, symbol table, | |
| 852 // string table, and referents of reachable weak refs. | |
|
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853 void g1_process_weak_roots(OopClosure* root_closure); |
| 342 | 854 |
| 3766 | 855 // Notifies all the necessary spaces that the committed space has |
| 856 // been updated (either expanded or shrunk). It should be called | |
| 857 // after _g1_storage is updated. | |
| 858 void update_committed_space(HeapWord* old_end, HeapWord* new_end); | |
| 859 | |
| 342 | 860 // The concurrent marker (and the thread it runs in.) |
| 861 ConcurrentMark* _cm; | |
| 862 ConcurrentMarkThread* _cmThread; | |
| 863 bool _mark_in_progress; | |
| 864 | |
| 865 // The concurrent refiner. | |
| 866 ConcurrentG1Refine* _cg1r; | |
| 867 | |
| 868 // The parallel task queues | |
| 869 RefToScanQueueSet *_task_queues; | |
| 870 | |
| 871 // True iff a evacuation has failed in the current collection. | |
| 872 bool _evacuation_failed; | |
| 873 | |
| 10405 | 874 EvacuationFailedInfo* _evacuation_failed_info_array; |
| 342 | 875 |
| 876 // Failed evacuations cause some logical from-space objects to have | |
| 877 // forwarding pointers to themselves. Reset them. | |
| 878 void remove_self_forwarding_pointers(); | |
| 879 | |
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880 // Together, these store an object with a preserved mark, and its mark value. |
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881 Stack<oop, mtGC> _objs_with_preserved_marks; |
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882 Stack<markOop, mtGC> _preserved_marks_of_objs; |
| 342 | 883 |
| 884 // Preserve the mark of "obj", if necessary, in preparation for its mark | |
| 885 // word being overwritten with a self-forwarding-pointer. | |
| 886 void preserve_mark_if_necessary(oop obj, markOop m); | |
| 887 | |
| 888 // The stack of evac-failure objects left to be scanned. | |
| 889 GrowableArray<oop>* _evac_failure_scan_stack; | |
| 890 // The closure to apply to evac-failure objects. | |
| 891 | |
| 892 OopsInHeapRegionClosure* _evac_failure_closure; | |
| 893 // Set the field above. | |
| 894 void | |
| 895 set_evac_failure_closure(OopsInHeapRegionClosure* evac_failure_closure) { | |
| 896 _evac_failure_closure = evac_failure_closure; | |
| 897 } | |
| 898 | |
| 899 // Push "obj" on the scan stack. | |
| 900 void push_on_evac_failure_scan_stack(oop obj); | |
| 901 // Process scan stack entries until the stack is empty. | |
| 902 void drain_evac_failure_scan_stack(); | |
| 903 // True iff an invocation of "drain_scan_stack" is in progress; to | |
| 904 // prevent unnecessary recursion. | |
| 905 bool _drain_in_progress; | |
| 906 | |
| 907 // Do any necessary initialization for evacuation-failure handling. | |
| 908 // "cl" is the closure that will be used to process evac-failure | |
| 909 // objects. | |
| 910 void init_for_evac_failure(OopsInHeapRegionClosure* cl); | |
| 911 // Do any necessary cleanup for evacuation-failure handling data | |
| 912 // structures. | |
| 913 void finalize_for_evac_failure(); | |
| 914 | |
| 915 // An attempt to evacuate "obj" has failed; take necessary steps. | |
| 10405 | 916 oop handle_evacuation_failure_par(G1ParScanThreadState* _par_scan_state, oop obj); |
| 342 | 917 void handle_evacuation_failure_common(oop obj, markOop m); |
| 918 | |
|
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919 #ifndef PRODUCT |
|
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920 // Support for forcing evacuation failures. Analogous to |
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921 // PromotionFailureALot for the other collectors. |
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922 |
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923 // Records whether G1EvacuationFailureALot should be in effect |
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924 // for the current GC |
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925 bool _evacuation_failure_alot_for_current_gc; |
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926 |
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927 // Used to record the GC number for interval checking when |
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928 // determining whether G1EvaucationFailureALot is in effect |
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929 // for the current GC. |
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930 size_t _evacuation_failure_alot_gc_number; |
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931 |
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932 // Count of the number of evacuations between failures. |
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933 volatile size_t _evacuation_failure_alot_count; |
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934 |
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935 // Set whether G1EvacuationFailureALot should be in effect |
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936 // for the current GC (based upon the type of GC and which |
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937 // command line flags are set); |
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938 inline bool evacuation_failure_alot_for_gc_type(bool gcs_are_young, |
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939 bool during_initial_mark, |
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940 bool during_marking); |
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941 |
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942 inline void set_evacuation_failure_alot_for_current_gc(); |
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943 |
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944 // Return true if it's time to cause an evacuation failure. |
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945 inline bool evacuation_should_fail(); |
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946 |
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947 // Reset the G1EvacuationFailureALot counters. Should be called at |
| 10405 | 948 // the end of an evacuation pause in which an evacuation failure occurred. |
|
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949 inline void reset_evacuation_should_fail(); |
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950 #endif // !PRODUCT |
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951 |
|
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952 // ("Weak") Reference processing support. |
|
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953 // |
| 10405 | 954 // G1 has 2 instances of the reference processor class. One |
|
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955 // (_ref_processor_cm) handles reference object discovery |
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956 // and subsequent processing during concurrent marking cycles. |
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957 // |
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958 // The other (_ref_processor_stw) handles reference object |
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959 // discovery and processing during full GCs and incremental |
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960 // evacuation pauses. |
|
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961 // |
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962 // During an incremental pause, reference discovery will be |
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963 // temporarily disabled for _ref_processor_cm and will be |
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964 // enabled for _ref_processor_stw. At the end of the evacuation |
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965 // pause references discovered by _ref_processor_stw will be |
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966 // processed and discovery will be disabled. The previous |
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967 // setting for reference object discovery for _ref_processor_cm |
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968 // will be re-instated. |
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969 // |
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970 // At the start of marking: |
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971 // * Discovery by the CM ref processor is verified to be inactive |
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972 // and it's discovered lists are empty. |
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973 // * Discovery by the CM ref processor is then enabled. |
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974 // |
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975 // At the end of marking: |
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976 // * Any references on the CM ref processor's discovered |
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977 // lists are processed (possibly MT). |
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978 // |
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979 // At the start of full GC we: |
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980 // * Disable discovery by the CM ref processor and |
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981 // empty CM ref processor's discovered lists |
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982 // (without processing any entries). |
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983 // * Verify that the STW ref processor is inactive and it's |
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984 // discovered lists are empty. |
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985 // * Temporarily set STW ref processor discovery as single threaded. |
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986 // * Temporarily clear the STW ref processor's _is_alive_non_header |
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987 // field. |
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988 // * Finally enable discovery by the STW ref processor. |
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989 // |
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990 // The STW ref processor is used to record any discovered |
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991 // references during the full GC. |
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992 // |
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993 // At the end of a full GC we: |
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994 // * Enqueue any reference objects discovered by the STW ref processor |
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995 // that have non-live referents. This has the side-effect of |
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996 // making the STW ref processor inactive by disabling discovery. |
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997 // * Verify that the CM ref processor is still inactive |
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998 // and no references have been placed on it's discovered |
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999 // lists (also checked as a precondition during initial marking). |
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1000 |
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1001 // The (stw) reference processor... |
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1002 ReferenceProcessor* _ref_processor_stw; |
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1003 |
| 10405 | 1004 STWGCTimer* _gc_timer_stw; |
| 1005 ConcurrentGCTimer* _gc_timer_cm; | |
| 1006 | |
| 1007 G1OldTracer* _gc_tracer_cm; | |
| 1008 G1NewTracer* _gc_tracer_stw; | |
| 1009 | |
|
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1010 // During reference object discovery, the _is_alive_non_header |
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1011 // closure (if non-null) is applied to the referent object to |
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1012 // determine whether the referent is live. If so then the |
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1013 // reference object does not need to be 'discovered' and can |
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1014 // be treated as a regular oop. This has the benefit of reducing |
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1015 // the number of 'discovered' reference objects that need to |
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1016 // be processed. |
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1017 // |
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1018 // Instance of the is_alive closure for embedding into the |
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1019 // STW reference processor as the _is_alive_non_header field. |
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1020 // Supplying a value for the _is_alive_non_header field is |
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1021 // optional but doing so prevents unnecessary additions to |
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1022 // the discovered lists during reference discovery. |
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1023 G1STWIsAliveClosure _is_alive_closure_stw; |
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1024 |
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1025 // The (concurrent marking) reference processor... |
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1026 ReferenceProcessor* _ref_processor_cm; |
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1027 |
|
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1028 // Instance of the concurrent mark is_alive closure for embedding |
|
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1029 // into the Concurrent Marking reference processor as the |
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1030 // _is_alive_non_header field. Supplying a value for the |
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1031 // _is_alive_non_header field is optional but doing so prevents |
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1032 // unnecessary additions to the discovered lists during reference |
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1033 // discovery. |
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1034 G1CMIsAliveClosure _is_alive_closure_cm; |
| 342 | 1035 |
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1036 // Cache used by G1CollectedHeap::start_cset_region_for_worker(). |
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1037 HeapRegion** _worker_cset_start_region; |
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1038 |
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1039 // Time stamp to validate the regions recorded in the cache |
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1040 // used by G1CollectedHeap::start_cset_region_for_worker(). |
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1041 // The heap region entry for a given worker is valid iff |
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1042 // the associated time stamp value matches the current value |
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1043 // of G1CollectedHeap::_gc_time_stamp. |
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1044 unsigned int* _worker_cset_start_region_time_stamp; |
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1045 |
| 342 | 1046 enum G1H_process_strong_roots_tasks { |
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1047 G1H_PS_filter_satb_buffers, |
| 342 | 1048 G1H_PS_refProcessor_oops_do, |
| 1049 // Leave this one last. | |
| 1050 G1H_PS_NumElements | |
| 1051 }; | |
| 1052 | |
| 1053 SubTasksDone* _process_strong_tasks; | |
| 1054 | |
| 2152 | 1055 volatile bool _free_regions_coming; |
| 342 | 1056 |
| 1057 public: | |
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1058 |
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1059 SubTasksDone* process_strong_tasks() { return _process_strong_tasks; } |
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1060 |
| 342 | 1061 void set_refine_cte_cl_concurrency(bool concurrent); |
| 1062 | |
| 1709 | 1063 RefToScanQueue *task_queue(int i) const; |
| 342 | 1064 |
|
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1065 // A set of cards where updates happened during the GC |
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1066 DirtyCardQueueSet& dirty_card_queue_set() { return _dirty_card_queue_set; } |
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1067 |
| 1705 | 1068 // A DirtyCardQueueSet that is used to hold cards that contain |
| 1069 // references into the current collection set. This is used to | |
| 1070 // update the remembered sets of the regions in the collection | |
| 1071 // set in the event of an evacuation failure. | |
| 1072 DirtyCardQueueSet& into_cset_dirty_card_queue_set() | |
| 1073 { return _into_cset_dirty_card_queue_set; } | |
| 1074 | |
| 342 | 1075 // Create a G1CollectedHeap with the specified policy. |
| 1076 // Must call the initialize method afterwards. | |
| 1077 // May not return if something goes wrong. | |
| 1078 G1CollectedHeap(G1CollectorPolicy* policy); | |
| 1079 | |
| 1080 // Initialize the G1CollectedHeap to have the initial and | |
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1081 // maximum sizes and remembered and barrier sets |
| 342 | 1082 // specified by the policy object. |
| 1083 jint initialize(); | |
| 1084 | |
|
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1085 // Return the (conservative) maximum heap alignment for any G1 heap |
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1086 static size_t conservative_max_heap_alignment(); |
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1087 |
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1088 // Initialize weak reference processing. |
|
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1089 virtual void ref_processing_init(); |
| 342 | 1090 |
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1091 void set_par_threads(uint t) { |
| 342 | 1092 SharedHeap::set_par_threads(t); |
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1093 // Done in SharedHeap but oddly there are |
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1094 // two _process_strong_tasks's in a G1CollectedHeap |
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1095 // so do it here too. |
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1096 _process_strong_tasks->set_n_threads(t); |
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1097 } |
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1098 |
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1099 // Set _n_par_threads according to a policy TBD. |
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1100 void set_par_threads(); |
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1101 |
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1102 void set_n_termination(int t) { |
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1103 _process_strong_tasks->set_n_threads(t); |
| 342 | 1104 } |
| 1105 | |
| 1106 virtual CollectedHeap::Name kind() const { | |
| 1107 return CollectedHeap::G1CollectedHeap; | |
| 1108 } | |
| 1109 | |
| 1110 // The current policy object for the collector. | |
| 1111 G1CollectorPolicy* g1_policy() const { return _g1_policy; } | |
| 1112 | |
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1113 virtual CollectorPolicy* collector_policy() const { return (CollectorPolicy*) g1_policy(); } |
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1114 |
| 342 | 1115 // Adaptive size policy. No such thing for g1. |
| 1116 virtual AdaptiveSizePolicy* size_policy() { return NULL; } | |
| 1117 | |
| 1118 // The rem set and barrier set. | |
| 1119 G1RemSet* g1_rem_set() const { return _g1_rem_set; } | |
| 1120 | |
| 1121 unsigned get_gc_time_stamp() { | |
| 1122 return _gc_time_stamp; | |
| 1123 } | |
| 1124 | |
| 1125 void reset_gc_time_stamp() { | |
| 1126 _gc_time_stamp = 0; | |
|
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1127 OrderAccess::fence(); |
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1128 // Clear the cached CSet starting regions and time stamps. |
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1129 // Their validity is dependent on the GC timestamp. |
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1130 clear_cset_start_regions(); |
|
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1131 } |
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1132 |
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1133 void check_gc_time_stamps() PRODUCT_RETURN; |
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1134 |
|
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1135 void increment_gc_time_stamp() { |
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1136 ++_gc_time_stamp; |
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1137 OrderAccess::fence(); |
| 342 | 1138 } |
| 1139 | |
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1140 // Reset the given region's GC timestamp. If it's starts humongous, |
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1141 // also reset the GC timestamp of its corresponding |
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1142 // continues humongous regions too. |
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1143 void reset_gc_time_stamps(HeapRegion* hr); |
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1144 |
| 1705 | 1145 void iterate_dirty_card_closure(CardTableEntryClosure* cl, |
| 1146 DirtyCardQueue* into_cset_dcq, | |
|
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1147 bool concurrent, uint worker_i); |
| 342 | 1148 |
| 1149 // The shared block offset table array. | |
| 1150 G1BlockOffsetSharedArray* bot_shared() const { return _bot_shared; } | |
| 1151 | |
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1152 // Reference Processing accessors |
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1153 |
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1154 // The STW reference processor.... |
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1155 ReferenceProcessor* ref_processor_stw() const { return _ref_processor_stw; } |
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1156 |
| 10405 | 1157 // The Concurrent Marking reference processor... |
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1158 ReferenceProcessor* ref_processor_cm() const { return _ref_processor_cm; } |
| 342 | 1159 |
| 10405 | 1160 ConcurrentGCTimer* gc_timer_cm() const { return _gc_timer_cm; } |
| 1161 G1OldTracer* gc_tracer_cm() const { return _gc_tracer_cm; } | |
| 1162 | |
| 342 | 1163 virtual size_t capacity() const; |
| 1164 virtual size_t used() const; | |
|
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1165 // This should be called when we're not holding the heap lock. The |
|
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1166 // result might be a bit inaccurate. |
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1167 size_t used_unlocked() const; |
| 342 | 1168 size_t recalculate_used() const; |
| 1169 | |
| 1170 // These virtual functions do the actual allocation. | |
| 1171 // Some heaps may offer a contiguous region for shared non-blocking | |
| 1172 // allocation, via inlined code (by exporting the address of the top and | |
| 1173 // end fields defining the extent of the contiguous allocation region.) | |
| 1174 // But G1CollectedHeap doesn't yet support this. | |
| 1175 | |
| 1176 // Return an estimate of the maximum allocation that could be performed | |
| 1177 // without triggering any collection or expansion activity. In a | |
| 1178 // generational collector, for example, this is probably the largest | |
| 1179 // allocation that could be supported (without expansion) in the youngest | |
| 1180 // generation. It is "unsafe" because no locks are taken; the result | |
| 1181 // should be treated as an approximation, not a guarantee, for use in | |
| 1182 // heuristic resizing decisions. | |
| 1183 virtual size_t unsafe_max_alloc(); | |
| 1184 | |
| 1185 virtual bool is_maximal_no_gc() const { | |
| 1186 return _g1_storage.uncommitted_size() == 0; | |
| 1187 } | |
| 1188 | |
| 1189 // The total number of regions in the heap. | |
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1190 uint n_regions() { return _hrs.length(); } |
| 3766 | 1191 |
| 1192 // The max number of regions in the heap. | |
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1193 uint max_regions() { return _hrs.max_length(); } |
| 342 | 1194 |
| 1195 // The number of regions that are completely free. | |
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1196 uint free_regions() { return _free_list.length(); } |
| 342 | 1197 |
| 1198 // The number of regions that are not completely free. | |
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1199 uint used_regions() { return n_regions() - free_regions(); } |
| 342 | 1200 |
| 1201 // The number of regions available for "regular" expansion. | |
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1202 uint expansion_regions() { return _expansion_regions; } |
| 342 | 1203 |
| 3766 | 1204 // Factory method for HeapRegion instances. It will return NULL if |
| 1205 // the allocation fails. | |
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1206 HeapRegion* new_heap_region(uint hrs_index, HeapWord* bottom); |
| 3766 | 1207 |
|
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1208 void verify_not_dirty_region(HeapRegion* hr) PRODUCT_RETURN; |
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1209 void verify_dirty_region(HeapRegion* hr) PRODUCT_RETURN; |
|
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1210 void verify_dirty_young_list(HeapRegion* head) PRODUCT_RETURN; |
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1211 void verify_dirty_young_regions() PRODUCT_RETURN; |
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1212 |
| 2152 | 1213 // verify_region_sets() performs verification over the region |
| 1214 // lists. It will be compiled in the product code to be used when | |
| 1215 // necessary (i.e., during heap verification). | |
| 1216 void verify_region_sets(); | |
| 342 | 1217 |
| 2152 | 1218 // verify_region_sets_optional() is planted in the code for |
| 1219 // list verification in non-product builds (and it can be enabled in | |
| 10405 | 1220 // product builds by defining HEAP_REGION_SET_FORCE_VERIFY to be 1). |
| 2152 | 1221 #if HEAP_REGION_SET_FORCE_VERIFY |
| 1222 void verify_region_sets_optional() { | |
| 1223 verify_region_sets(); | |
| 1224 } | |
| 1225 #else // HEAP_REGION_SET_FORCE_VERIFY | |
| 1226 void verify_region_sets_optional() { } | |
| 1227 #endif // HEAP_REGION_SET_FORCE_VERIFY | |
| 342 | 1228 |
| 2152 | 1229 #ifdef ASSERT |
| 2361 | 1230 bool is_on_master_free_list(HeapRegion* hr) { |
| 2152 | 1231 return hr->containing_set() == &_free_list; |
| 1232 } | |
| 1233 #endif // ASSERT | |
| 342 | 1234 |
| 2152 | 1235 // Wrapper for the region list operations that can be called from |
| 1236 // methods outside this class. | |
| 342 | 1237 |
|
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1238 void secondary_free_list_add(FreeRegionList* list) { |
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1239 _secondary_free_list.add_ordered(list); |
| 2152 | 1240 } |
| 342 | 1241 |
| 2152 | 1242 void append_secondary_free_list() { |
|
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1243 _free_list.add_ordered(&_secondary_free_list); |
| 2152 | 1244 } |
| 342 | 1245 |
| 2361 | 1246 void append_secondary_free_list_if_not_empty_with_lock() { |
| 1247 // If the secondary free list looks empty there's no reason to | |
| 1248 // take the lock and then try to append it. | |
| 2152 | 1249 if (!_secondary_free_list.is_empty()) { |
| 1250 MutexLockerEx x(SecondaryFreeList_lock, Mutex::_no_safepoint_check_flag); | |
| 1251 append_secondary_free_list(); | |
| 1252 } | |
| 1253 } | |
| 342 | 1254 |
|
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1255 inline void old_set_remove(HeapRegion* hr); |
| 4072 | 1256 |
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1257 size_t non_young_capacity_bytes() { |
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1258 return _old_set.total_capacity_bytes() + _humongous_set.total_capacity_bytes(); |
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1259 } |
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1260 |
| 2152 | 1261 void set_free_regions_coming(); |
| 1262 void reset_free_regions_coming(); | |
| 1263 bool free_regions_coming() { return _free_regions_coming; } | |
| 1264 void wait_while_free_regions_coming(); | |
| 342 | 1265 |
|
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1266 // Determine whether the given region is one that we are using as an |
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1267 // old GC alloc region. |
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1268 bool is_old_gc_alloc_region(HeapRegion* hr) { |
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1269 return hr == _retained_old_gc_alloc_region; |
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1270 } |
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1271 |
| 342 | 1272 // Perform a collection of the heap; intended for use in implementing |
| 1273 // "System.gc". This probably implies as full a collection as the | |
| 1274 // "CollectedHeap" supports. | |
| 1275 virtual void collect(GCCause::Cause cause); | |
| 1276 | |
| 1277 // The same as above but assume that the caller holds the Heap_lock. | |
| 1278 void collect_locked(GCCause::Cause cause); | |
| 1279 | |
| 10405 | 1280 // True iff an evacuation has failed in the most-recent collection. |
| 342 | 1281 bool evacuation_failed() { return _evacuation_failed; } |
| 1282 | |
|
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1283 void remove_from_old_sets(const HeapRegionSetCount& old_regions_removed, const HeapRegionSetCount& humongous_regions_removed); |
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1284 void prepend_to_freelist(FreeRegionList* list); |
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1285 void decrement_summary_bytes(size_t bytes); |
| 342 | 1286 |
| 4708 | 1287 // Returns "TRUE" iff "p" points into the committed areas of the heap. |
| 342 | 1288 virtual bool is_in(const void* p) const; |
| 1289 | |
| 1290 // Return "TRUE" iff the given object address is within the collection | |
| 1291 // set. | |
| 1292 inline bool obj_in_cs(oop obj); | |
| 1293 | |
| 1294 // Return "TRUE" iff the given object address is in the reserved | |
|
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1295 // region of g1. |
| 342 | 1296 bool is_in_g1_reserved(const void* p) const { |
| 1297 return _g1_reserved.contains(p); | |
| 1298 } | |
| 1299 | |
|
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1300 // Returns a MemRegion that corresponds to the space that has been |
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1301 // reserved for the heap |
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1302 MemRegion g1_reserved() { |
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1303 return _g1_reserved; |
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1304 } |
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1305 |
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1306 // Returns a MemRegion that corresponds to the space that has been |
| 342 | 1307 // committed in the heap |
| 1308 MemRegion g1_committed() { | |
| 1309 return _g1_committed; | |
| 1310 } | |
| 1311 | |
| 2311 | 1312 virtual bool is_in_closed_subset(const void* p) const; |
| 342 | 1313 |
| 12343 | 1314 G1SATBCardTableModRefBS* g1_barrier_set() { |
| 1315 return (G1SATBCardTableModRefBS*) barrier_set(); | |
| 1316 } | |
| 1317 | |
| 342 | 1318 // This resets the card table to all zeros. It is used after |
| 1319 // a collection pause which used the card table to claim cards. | |
| 1320 void cleanUpCardTable(); | |
| 1321 | |
| 1322 // Iteration functions. | |
| 1323 | |
| 1324 // Iterate over all the ref-containing fields of all objects, calling | |
| 1325 // "cl.do_oop" on each. | |
|
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1326 virtual void oop_iterate(ExtendedOopClosure* cl); |
| 342 | 1327 |
| 1328 // Same as above, restricted to a memory region. | |
|
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1329 void oop_iterate(MemRegion mr, ExtendedOopClosure* cl); |
| 342 | 1330 |
| 1331 // Iterate over all objects, calling "cl.do_object" on each. | |
|
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1332 virtual void object_iterate(ObjectClosure* cl); |
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1333 |
| 678 | 1334 virtual void safe_object_iterate(ObjectClosure* cl) { |
|
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1335 object_iterate(cl); |
| 678 | 1336 } |
| 342 | 1337 |
| 1338 // Iterate over all spaces in use in the heap, in ascending address order. | |
| 1339 virtual void space_iterate(SpaceClosure* cl); | |
| 1340 | |
| 1341 // Iterate over heap regions, in address order, terminating the | |
| 1342 // iteration early if the "doHeapRegion" method returns "true". | |
| 3766 | 1343 void heap_region_iterate(HeapRegionClosure* blk) const; |
| 342 | 1344 |
| 3766 | 1345 // Return the region with the given index. It assumes the index is valid. |
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1346 inline HeapRegion* region_at(uint index) const; |
| 342 | 1347 |
| 1348 // Divide the heap region sequence into "chunks" of some size (the number | |
| 1349 // of regions divided by the number of parallel threads times some | |
| 1350 // overpartition factor, currently 4). Assumes that this will be called | |
| 1351 // in parallel by ParallelGCThreads worker threads with discinct worker | |
| 1352 // ids in the range [0..max(ParallelGCThreads-1, 1)], that all parallel | |
| 1353 // calls will use the same "claim_value", and that that claim value is | |
| 1354 // different from the claim_value of any heap region before the start of | |
| 1355 // the iteration. Applies "blk->doHeapRegion" to each of the regions, by | |
| 1356 // attempting to claim the first region in each chunk, and, if | |
| 1357 // successful, applying the closure to each region in the chunk (and | |
| 1358 // setting the claim value of the second and subsequent regions of the | |
| 1359 // chunk.) For now requires that "doHeapRegion" always returns "false", | |
| 1360 // i.e., that a closure never attempt to abort a traversal. | |
| 1361 void heap_region_par_iterate_chunked(HeapRegionClosure* blk, | |
|
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1362 uint worker, |
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1363 uint no_of_par_workers, |
| 342 | 1364 jint claim_value); |
| 1365 | |
| 390 | 1366 // It resets all the region claim values to the default. |
| 1367 void reset_heap_region_claim_values(); | |
| 1368 | |
|
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1369 // Resets the claim values of regions in the current |
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1370 // collection set to the default. |
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1371 void reset_cset_heap_region_claim_values(); |
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1372 |
| 355 | 1373 #ifdef ASSERT |
| 1374 bool check_heap_region_claim_values(jint claim_value); | |
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1375 |
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1376 // Same as the routine above but only checks regions in the |
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1377 // current collection set. |
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1378 bool check_cset_heap_region_claim_values(jint claim_value); |
| 355 | 1379 #endif // ASSERT |
| 1380 | |
|
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1381 // Clear the cached cset start regions and (more importantly) |
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1382 // the time stamps. Called when we reset the GC time stamp. |
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1383 void clear_cset_start_regions(); |
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1384 |
|
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1385 // Given the id of a worker, obtain or calculate a suitable |
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1386 // starting region for iterating over the current collection set. |
|
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1387 HeapRegion* start_cset_region_for_worker(uint worker_i); |
|
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1388 |
|
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1389 // This is a convenience method that is used by the |
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1390 // HeapRegionIterator classes to calculate the starting region for |
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1391 // each worker so that they do not all start from the same region. |
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1392 HeapRegion* start_region_for_worker(uint worker_i, uint no_of_par_workers); |
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1393 |
| 342 | 1394 // Iterate over the regions (if any) in the current collection set. |
| 1395 void collection_set_iterate(HeapRegionClosure* blk); | |
| 1396 | |
| 1397 // As above but starting from region r | |
| 1398 void collection_set_iterate_from(HeapRegion* r, HeapRegionClosure *blk); | |
| 1399 | |
| 1400 // Returns the first (lowest address) compactible space in the heap. | |
| 1401 virtual CompactibleSpace* first_compactible_space(); | |
| 1402 | |
| 1403 // A CollectedHeap will contain some number of spaces. This finds the | |
| 1404 // space containing a given address, or else returns NULL. | |
| 1405 virtual Space* space_containing(const void* addr) const; | |
| 1406 | |
| 1407 // A G1CollectedHeap will contain some number of heap regions. This | |
| 1408 // finds the region containing a given address, or else returns NULL. | |
| 3766 | 1409 template <class T> |
| 1410 inline HeapRegion* heap_region_containing(const T addr) const; | |
| 342 | 1411 |
| 1412 // Like the above, but requires "addr" to be in the heap (to avoid a | |
| 1413 // null-check), and unlike the above, may return an continuing humongous | |
| 1414 // region. | |
| 3766 | 1415 template <class T> |
| 1416 inline HeapRegion* heap_region_containing_raw(const T addr) const; | |
| 342 | 1417 |
| 1418 // A CollectedHeap is divided into a dense sequence of "blocks"; that is, | |
| 1419 // each address in the (reserved) heap is a member of exactly | |
| 1420 // one block. The defining characteristic of a block is that it is | |
| 1421 // possible to find its size, and thus to progress forward to the next | |
| 1422 // block. (Blocks may be of different sizes.) Thus, blocks may | |
| 1423 // represent Java objects, or they might be free blocks in a | |
| 1424 // free-list-based heap (or subheap), as long as the two kinds are | |
| 1425 // distinguishable and the size of each is determinable. | |
| 1426 | |
| 1427 // Returns the address of the start of the "block" that contains the | |
| 1428 // address "addr". We say "blocks" instead of "object" since some heaps | |
| 1429 // may not pack objects densely; a chunk may either be an object or a | |
| 1430 // non-object. | |
| 1431 virtual HeapWord* block_start(const void* addr) const; | |
| 1432 | |
| 1433 // Requires "addr" to be the start of a chunk, and returns its size. | |
| 1434 // "addr + size" is required to be the start of a new chunk, or the end | |
| 1435 // of the active area of the heap. | |
| 1436 virtual size_t block_size(const HeapWord* addr) const; | |
| 1437 | |
| 1438 // Requires "addr" to be the start of a block, and returns "TRUE" iff | |
| 1439 // the block is an object. | |
| 1440 virtual bool block_is_obj(const HeapWord* addr) const; | |
| 1441 | |
| 1442 // Does this heap support heap inspection? (+PrintClassHistogram) | |
| 1443 virtual bool supports_heap_inspection() const { return true; } | |
| 1444 | |
| 1445 // Section on thread-local allocation buffers (TLABs) | |
| 1446 // See CollectedHeap for semantics. | |
| 1447 | |
| 17727 | 1448 bool supports_tlab_allocation() const; |
| 1449 size_t tlab_capacity(Thread* ignored) const; | |
| 1450 size_t tlab_used(Thread* ignored) const; | |
| 1451 size_t max_tlab_size() const; | |
| 1452 size_t unsafe_max_tlab_alloc(Thread* ignored) const; | |
| 342 | 1453 |
| 1454 // Can a compiler initialize a new object without store barriers? | |
| 1455 // This permission only extends from the creation of a new object | |
|
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1456 // via a TLAB up to the first subsequent safepoint. If such permission |
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1457 // is granted for this heap type, the compiler promises to call |
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1458 // defer_store_barrier() below on any slow path allocation of |
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1459 // a new object for which such initializing store barriers will |
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1460 // have been elided. G1, like CMS, allows this, but should be |
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1461 // ready to provide a compensating write barrier as necessary |
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1462 // if that storage came out of a non-young region. The efficiency |
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1463 // of this implementation depends crucially on being able to |
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1464 // answer very efficiently in constant time whether a piece of |
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1465 // storage in the heap comes from a young region or not. |
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1466 // See ReduceInitialCardMarks. |
| 342 | 1467 virtual bool can_elide_tlab_store_barriers() const { |
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1468 return true; |
|
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1469 } |
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1470 |
| 1166 | 1471 virtual bool card_mark_must_follow_store() const { |
| 1472 return true; | |
| 1473 } | |
| 1474 | |
|
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1475 inline bool is_in_young(const oop obj); |
|
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1476 |
|
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1477 #ifdef ASSERT |
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1478 virtual bool is_in_partial_collection(const void* p); |
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1479 #endif |
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1480 |
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1481 virtual bool is_scavengable(const void* addr); |
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1482 |
|
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1483 // We don't need barriers for initializing stores to objects |
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1484 // in the young gen: for the SATB pre-barrier, there is no |
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1485 // pre-value that needs to be remembered; for the remembered-set |
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1486 // update logging post-barrier, we don't maintain remembered set |
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1487 // information for young gen objects. |
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1488 virtual inline bool can_elide_initializing_store_barrier(oop new_obj); |
| 342 | 1489 |
| 1490 // Returns "true" iff the given word_size is "very large". | |
| 1491 static bool isHumongous(size_t word_size) { | |
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1492 // Note this has to be strictly greater-than as the TLABs |
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1493 // are capped at the humongous thresold and we want to |
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1494 // ensure that we don't try to allocate a TLAB as |
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1495 // humongous and that we don't allocate a humongous |
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1496 // object in a TLAB. |
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1497 return word_size > _humongous_object_threshold_in_words; |
| 342 | 1498 } |
| 1499 | |
| 1500 // Update mod union table with the set of dirty cards. | |
| 1501 void updateModUnion(); | |
| 1502 | |
| 1503 // Set the mod union bits corresponding to the given memRegion. Note | |
| 1504 // that this is always a safe operation, since it doesn't clear any | |
| 1505 // bits. | |
| 1506 void markModUnionRange(MemRegion mr); | |
| 1507 | |
| 1508 // Records the fact that a marking phase is no longer in progress. | |
| 1509 void set_marking_complete() { | |
| 1510 _mark_in_progress = false; | |
| 1511 } | |
| 1512 void set_marking_started() { | |
| 1513 _mark_in_progress = true; | |
| 1514 } | |
| 1515 bool mark_in_progress() { | |
| 1516 return _mark_in_progress; | |
| 1517 } | |
| 1518 | |
| 1519 // Print the maximum heap capacity. | |
| 1520 virtual size_t max_capacity() const; | |
| 1521 | |
| 1522 virtual jlong millis_since_last_gc(); | |
| 1523 | |
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1524 |
| 342 | 1525 // Convenience function to be used in situations where the heap type can be |
| 1526 // asserted to be this type. | |
| 1527 static G1CollectedHeap* heap(); | |
| 1528 | |
| 1529 void set_region_short_lived_locked(HeapRegion* hr); | |
| 1530 // add appropriate methods for any other surv rate groups | |
| 1531 | |
| 17727 | 1532 YoungList* young_list() const { return _young_list; } |
| 342 | 1533 |
| 1534 // debugging | |
| 1535 bool check_young_list_well_formed() { | |
| 1536 return _young_list->check_list_well_formed(); | |
| 1537 } | |
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1538 |
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1539 bool check_young_list_empty(bool check_heap, |
| 342 | 1540 bool check_sample = true); |
| 1541 | |
| 1542 // *** Stuff related to concurrent marking. It's not clear to me that so | |
| 1543 // many of these need to be public. | |
| 1544 | |
| 1545 // The functions below are helper functions that a subclass of | |
| 1546 // "CollectedHeap" can use in the implementation of its virtual | |
| 1547 // functions. | |
| 1548 // This performs a concurrent marking of the live objects in a | |
| 1549 // bitmap off to the side. | |
| 1550 void doConcurrentMark(); | |
| 1551 | |
| 1552 bool isMarkedPrev(oop obj) const; | |
| 1553 bool isMarkedNext(oop obj) const; | |
| 1554 | |
| 1555 // Determine if an object is dead, given the object and also | |
| 1556 // the region to which the object belongs. An object is dead | |
| 1557 // iff a) it was not allocated since the last mark and b) it | |
| 1558 // is not marked. | |
| 1559 | |
| 1560 bool is_obj_dead(const oop obj, const HeapRegion* hr) const { | |
| 1561 return | |
| 1562 !hr->obj_allocated_since_prev_marking(obj) && | |
| 1563 !isMarkedPrev(obj); | |
| 1564 } | |
| 1565 | |
| 1566 // This function returns true when an object has been | |
| 1567 // around since the previous marking and hasn't yet | |
| 1568 // been marked during this marking. | |
| 1569 | |
| 1570 bool is_obj_ill(const oop obj, const HeapRegion* hr) const { | |
| 1571 return | |
| 1572 !hr->obj_allocated_since_next_marking(obj) && | |
| 1573 !isMarkedNext(obj); | |
| 1574 } | |
| 1575 | |
| 1576 // Determine if an object is dead, given only the object itself. | |
| 1577 // This will find the region to which the object belongs and | |
| 1578 // then call the region version of the same function. | |
| 1579 | |
| 1580 // Added if it is NULL it isn't dead. | |
| 1581 | |
|
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1582 inline bool is_obj_dead(const oop obj) const; |
| 342 | 1583 |
|
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1584 inline bool is_obj_ill(const oop obj) const; |
| 342 | 1585 |
| 12080 | 1586 bool allocated_since_marking(oop obj, HeapRegion* hr, VerifyOption vo); |
| 1587 HeapWord* top_at_mark_start(HeapRegion* hr, VerifyOption vo); | |
| 1588 bool is_marked(oop obj, VerifyOption vo); | |
| 1589 const char* top_at_mark_start_str(VerifyOption vo); | |
| 1590 | |
| 1591 ConcurrentMark* concurrent_mark() const { return _cm; } | |
| 1592 | |
| 1593 // Refinement | |
| 1594 | |
| 1595 ConcurrentG1Refine* concurrent_g1_refine() const { return _cg1r; } | |
| 1596 | |
| 1597 // The dirty cards region list is used to record a subset of regions | |
| 1598 // whose cards need clearing. The list if populated during the | |
| 1599 // remembered set scanning and drained during the card table | |
| 1600 // cleanup. Although the methods are reentrant, population/draining | |
| 1601 // phases must not overlap. For synchronization purposes the last | |
| 1602 // element on the list points to itself. | |
| 1603 HeapRegion* _dirty_cards_region_list; | |
| 1604 void push_dirty_cards_region(HeapRegion* hr); | |
| 1605 HeapRegion* pop_dirty_cards_region(); | |
| 1606 | |
| 1607 // Optimized nmethod scanning support routines | |
| 1608 | |
| 1609 // Register the given nmethod with the G1 heap | |
| 1610 virtual void register_nmethod(nmethod* nm); | |
| 1611 | |
| 1612 // Unregister the given nmethod from the G1 heap | |
| 1613 virtual void unregister_nmethod(nmethod* nm); | |
| 1614 | |
| 1615 // Migrate the nmethods in the code root lists of the regions | |
| 1616 // in the collection set to regions in to-space. In the event | |
| 1617 // of an evacuation failure, nmethods that reference objects | |
| 1618 // that were not successfullly evacuated are not migrated. | |
| 1619 void migrate_strong_code_roots(); | |
| 1620 | |
|
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1621 // Free up superfluous code root memory. |
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|
1622 void purge_code_root_memory(); |
|
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|
1623 |
| 12080 | 1624 // During an initial mark pause, mark all the code roots that |
| 1625 // point into regions *not* in the collection set. | |
| 1626 void mark_strong_code_roots(uint worker_id); | |
| 1627 | |
| 1628 // Rebuild the stong code root lists for each region | |
| 1629 // after a full GC | |
| 1630 void rebuild_strong_code_roots(); | |
| 1631 | |
|
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|
1632 // Delete entries for dead interned string and clean up unreferenced symbols |
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|
1633 // in symbol table, possibly in parallel. |
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|
1634 void unlink_string_and_symbol_table(BoolObjectClosure* is_alive, bool unlink_strings = true, bool unlink_symbols = true); |
|
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|
1635 |
|
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|
1636 // Redirty logged cards in the refinement queue. |
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|
1637 void redirty_logged_cards(); |
| 12080 | 1638 // Verification |
| 1639 | |
| 1640 // The following is just to alert the verification code | |
| 1641 // that a full collection has occurred and that the | |
| 1642 // remembered sets are no longer up to date. | |
| 1643 bool _full_collection; | |
| 1644 void set_full_collection() { _full_collection = true;} | |
| 1645 void clear_full_collection() {_full_collection = false;} | |
| 1646 bool full_collection() {return _full_collection;} | |
| 1647 | |
| 1648 // Perform any cleanup actions necessary before allowing a verification. | |
| 1649 virtual void prepare_for_verify(); | |
| 1650 | |
| 1651 // Perform verification. | |
| 1652 | |
| 1653 // vo == UsePrevMarking -> use "prev" marking information, | |
| 1654 // vo == UseNextMarking -> use "next" marking information | |
| 1655 // vo == UseMarkWord -> use the mark word in the object header | |
| 1656 // | |
| 1657 // NOTE: Only the "prev" marking information is guaranteed to be | |
| 1658 // consistent most of the time, so most calls to this should use | |
| 1659 // vo == UsePrevMarking. | |
| 1660 // Currently, there is only one case where this is called with | |
| 1661 // vo == UseNextMarking, which is to verify the "next" marking | |
| 1662 // information at the end of remark. | |
| 1663 // Currently there is only one place where this is called with | |
| 1664 // vo == UseMarkWord, which is to verify the marking during a | |
| 1665 // full GC. | |
| 1666 void verify(bool silent, VerifyOption vo); | |
| 1667 | |
| 1668 // Override; it uses the "prev" marking information | |
| 1669 virtual void verify(bool silent); | |
| 1670 | |
|
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1671 // The methods below are here for convenience and dispatch the |
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|
1672 // appropriate method depending on value of the given VerifyOption |
| 12080 | 1673 // parameter. The values for that parameter, and their meanings, |
| 1674 // are the same as those above. | |
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1675 |
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|
1676 bool is_obj_dead_cond(const oop obj, |
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|
1677 const HeapRegion* hr, |
|
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|
1678 const VerifyOption vo) const; |
|
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1679 |
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|
1680 bool is_obj_dead_cond(const oop obj, |
|
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|
1681 const VerifyOption vo) const; |
|
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|
1682 |
| 12080 | 1683 // Printing |
|
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|
1684 |
| 12080 | 1685 virtual void print_on(outputStream* st) const; |
| 1686 virtual void print_extended_on(outputStream* st) const; | |
| 1687 virtual void print_on_error(outputStream* st) const; | |
| 342 | 1688 |
| 12080 | 1689 virtual void print_gc_threads_on(outputStream* st) const; |
| 1690 virtual void gc_threads_do(ThreadClosure* tc) const; | |
| 342 | 1691 |
| 12080 | 1692 // Override |
| 1693 void print_tracing_info() const; | |
| 1694 | |
| 1695 // The following two methods are helpful for debugging RSet issues. | |
| 1696 void print_cset_rsets() PRODUCT_RETURN; | |
| 1697 void print_all_rsets() PRODUCT_RETURN; | |
|
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|
1698 |
| 342 | 1699 public: |
| 1700 void stop_conc_gc_threads(); | |
| 1701 | |
| 1702 size_t pending_card_num(); | |
| 1703 size_t cards_scanned(); | |
| 1704 | |
| 1705 protected: | |
| 1706 size_t _max_heap_capacity; | |
| 1707 }; | |
| 1708 | |
|
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1709 class G1ParGCAllocBuffer: public ParGCAllocBuffer { |
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1710 private: |
|
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|
1711 bool _retired; |
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1712 |
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|
1713 public: |
|
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|
1714 G1ParGCAllocBuffer(size_t gclab_word_size); |
|
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1715 |
|
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|
1716 void set_buf(HeapWord* buf) { |
|
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1717 ParGCAllocBuffer::set_buf(buf); |
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|
1718 _retired = false; |
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|
1719 } |
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1720 |
|
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1721 void retire(bool end_of_gc, bool retain) { |
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1722 if (_retired) |
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|
1723 return; |
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|
1724 ParGCAllocBuffer::retire(end_of_gc, retain); |
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1725 _retired = true; |
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|
1726 } |
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|
1727 }; |
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|
1728 |
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|
1729 class G1ParScanThreadState : public StackObj { |
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1730 protected: |
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|
1731 G1CollectedHeap* _g1h; |
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|
1732 RefToScanQueue* _refs; |
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|
1733 DirtyCardQueue _dcq; |
| 12343 | 1734 G1SATBCardTableModRefBS* _ct_bs; |
|
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|
1735 G1RemSet* _g1_rem; |
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|
1736 |
|
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|
1737 G1ParGCAllocBuffer _surviving_alloc_buffer; |
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|
1738 G1ParGCAllocBuffer _tenured_alloc_buffer; |
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|
1739 G1ParGCAllocBuffer* _alloc_buffers[GCAllocPurposeCount]; |
|
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|
1740 ageTable _age_table; |
|
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1741 |
|
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|
1742 G1ParScanClosure _scanner; |
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1743 |
|
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1744 size_t _alloc_buffer_waste; |
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|
1745 size_t _undo_waste; |
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1746 |
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|
1747 OopsInHeapRegionClosure* _evac_failure_cl; |
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|
1748 |
| 10405 | 1749 int _hash_seed; |
|
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1750 uint _queue_num; |
|
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1751 |
| 1611 | 1752 size_t _term_attempts; |
|
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1753 |
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|
1754 double _start; |
|
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|
1755 double _start_strong_roots; |
|
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|
1756 double _strong_roots_time; |
|
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|
1757 double _start_term; |
|
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|
1758 double _term_time; |
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|
1759 |
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1760 // Map from young-age-index (0 == not young, 1 is youngest) to |
|
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1761 // surviving words. base is what we get back from the malloc call |
|
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1762 size_t* _surviving_young_words_base; |
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1763 // this points into the array, as we use the first few entries for padding |
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1764 size_t* _surviving_young_words; |
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1765 |
| 1709 | 1766 #define PADDING_ELEM_NUM (DEFAULT_CACHE_LINE_SIZE / sizeof(size_t)) |
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1767 |
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1768 void add_to_alloc_buffer_waste(size_t waste) { _alloc_buffer_waste += waste; } |
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1769 |
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1770 void add_to_undo_waste(size_t waste) { _undo_waste += waste; } |
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1771 |
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1772 DirtyCardQueue& dirty_card_queue() { return _dcq; } |
| 12343 | 1773 G1SATBCardTableModRefBS* ctbs() { return _ct_bs; } |
|
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1774 |
|
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1775 template <class T> inline void immediate_rs_update(HeapRegion* from, T* p, int tid); |
|
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1776 |
|
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1777 template <class T> void deferred_rs_update(HeapRegion* from, T* p, int tid) { |
|
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1778 // If the new value of the field points to the same region or |
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1779 // is the to-space, we don't need to include it in the Rset updates. |
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1780 if (!from->is_in_reserved(oopDesc::load_decode_heap_oop(p)) && !from->is_survivor()) { |
|
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1781 size_t card_index = ctbs()->index_for(p); |
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1782 // If the card hasn't been added to the buffer, do it. |
|
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1783 if (ctbs()->mark_card_deferred(card_index)) { |
|
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1784 dirty_card_queue().enqueue((jbyte*)ctbs()->byte_for_index(card_index)); |
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1785 } |
|
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1786 } |
|
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|
1787 } |
|
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|
1788 |
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|
1789 public: |
|
17689
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1790 G1ParScanThreadState(G1CollectedHeap* g1h, uint queue_num, ReferenceProcessor* rp); |
|
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1791 |
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1792 ~G1ParScanThreadState() { |
| 6197 | 1793 FREE_C_HEAP_ARRAY(size_t, _surviving_young_words_base, mtGC); |
|
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1794 } |
|
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1795 |
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1796 RefToScanQueue* refs() { return _refs; } |
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1797 ageTable* age_table() { return &_age_table; } |
|
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1798 |
|
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1799 G1ParGCAllocBuffer* alloc_buffer(GCAllocPurpose purpose) { |
|
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1800 return _alloc_buffers[purpose]; |
|
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1801 } |
|
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1802 |
| 1709 | 1803 size_t alloc_buffer_waste() const { return _alloc_buffer_waste; } |
| 1804 size_t undo_waste() const { return _undo_waste; } | |
|
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1805 |
|
1862
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|
1806 #ifdef ASSERT |
|
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|
1807 bool verify_ref(narrowOop* ref) const; |
|
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1808 bool verify_ref(oop* ref) const; |
|
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1809 bool verify_task(StarTask ref) const; |
|
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|
1810 #endif // ASSERT |
|
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|
1811 |
|
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|
1812 template <class T> void push_on_queue(T* ref) { |
|
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1813 assert(verify_ref(ref), "sanity"); |
| 1709 | 1814 refs()->push(ref); |
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1815 } |
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1816 |
|
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1817 template <class T> inline void update_rs(HeapRegion* from, T* p, int tid); |
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1818 |
|
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1819 HeapWord* allocate_slow(GCAllocPurpose purpose, size_t word_sz) { |
|
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1820 HeapWord* obj = NULL; |
|
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1821 size_t gclab_word_size = _g1h->desired_plab_sz(purpose); |
|
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1822 if (word_sz * 100 < gclab_word_size * ParallelGCBufferWastePct) { |
|
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1823 G1ParGCAllocBuffer* alloc_buf = alloc_buffer(purpose); |
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1824 add_to_alloc_buffer_waste(alloc_buf->words_remaining()); |
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1825 alloc_buf->retire(false /* end_of_gc */, false /* retain */); |
|
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1826 |
|
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1827 HeapWord* buf = _g1h->par_allocate_during_gc(purpose, gclab_word_size); |
|
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1828 if (buf == NULL) return NULL; // Let caller handle allocation failure. |
|
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1829 // Otherwise. |
|
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1830 alloc_buf->set_word_size(gclab_word_size); |
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1831 alloc_buf->set_buf(buf); |
|
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1832 |
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1833 obj = alloc_buf->allocate(word_sz); |
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1834 assert(obj != NULL, "buffer was definitely big enough..."); |
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1835 } else { |
|
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1836 obj = _g1h->par_allocate_during_gc(purpose, word_sz); |
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|
1837 } |
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1838 return obj; |
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1839 } |
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1840 |
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1841 HeapWord* allocate(GCAllocPurpose purpose, size_t word_sz) { |
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1842 HeapWord* obj = alloc_buffer(purpose)->allocate(word_sz); |
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1843 if (obj != NULL) return obj; |
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1844 return allocate_slow(purpose, word_sz); |
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1845 } |
|
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1846 |
|
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1847 void undo_allocation(GCAllocPurpose purpose, HeapWord* obj, size_t word_sz) { |
|
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1848 if (alloc_buffer(purpose)->contains(obj)) { |
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1849 assert(alloc_buffer(purpose)->contains(obj + word_sz - 1), |
|
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1850 "should contain whole object"); |
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1851 alloc_buffer(purpose)->undo_allocation(obj, word_sz); |
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1852 } else { |
|
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1853 CollectedHeap::fill_with_object(obj, word_sz); |
|
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1854 add_to_undo_waste(word_sz); |
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1855 } |
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1856 } |
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1857 |
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|
1858 void set_evac_failure_closure(OopsInHeapRegionClosure* evac_failure_cl) { |
|
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1859 _evac_failure_cl = evac_failure_cl; |
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|
1860 } |
|
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|
1861 OopsInHeapRegionClosure* evac_failure_closure() { |
|
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|
1862 return _evac_failure_cl; |
|
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|
1863 } |
|
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1864 |
|
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|
1865 int* hash_seed() { return &_hash_seed; } |
|
4836
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|
1866 uint queue_num() { return _queue_num; } |
|
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|
1867 |
| 1709 | 1868 size_t term_attempts() const { return _term_attempts; } |
| 1611 | 1869 void note_term_attempt() { _term_attempts++; } |
|
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|
1870 |
|
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|
1871 void start_strong_roots() { |
|
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|
1872 _start_strong_roots = os::elapsedTime(); |
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1873 } |
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1874 void end_strong_roots() { |
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1875 _strong_roots_time += (os::elapsedTime() - _start_strong_roots); |
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1876 } |
| 1709 | 1877 double strong_roots_time() const { return _strong_roots_time; } |
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1878 |
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1879 void start_term_time() { |
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1880 note_term_attempt(); |
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1881 _start_term = os::elapsedTime(); |
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1882 } |
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1883 void end_term_time() { |
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1884 _term_time += (os::elapsedTime() - _start_term); |
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1885 } |
| 1709 | 1886 double term_time() const { return _term_time; } |
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1887 |
| 1709 | 1888 double elapsed_time() const { |
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1889 return os::elapsedTime() - _start; |
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1890 } |
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1891 |
| 1709 | 1892 static void |
| 1893 print_termination_stats_hdr(outputStream* const st = gclog_or_tty); | |
| 1894 void | |
| 1895 print_termination_stats(int i, outputStream* const st = gclog_or_tty) const; | |
| 1896 | |
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1897 size_t* surviving_young_words() { |
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1898 // We add on to hide entry 0 which accumulates surviving words for |
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1899 // age -1 regions (i.e. non-young ones) |
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1900 return _surviving_young_words; |
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1901 } |
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1902 |
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1903 void retire_alloc_buffers() { |
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1904 for (int ap = 0; ap < GCAllocPurposeCount; ++ap) { |
|
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1905 size_t waste = _alloc_buffers[ap]->words_remaining(); |
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1906 add_to_alloc_buffer_waste(waste); |
| 6595 | 1907 _alloc_buffers[ap]->flush_stats_and_retire(_g1h->stats_for_purpose((GCAllocPurpose)ap), |
| 1908 true /* end_of_gc */, | |
| 1909 false /* retain */); | |
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1910 } |
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1911 } |
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1912 private: |
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1913 #define G1_PARTIAL_ARRAY_MASK 0x2 |
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1914 |
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1915 inline bool has_partial_array_mask(oop* ref) const { |
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1916 return ((uintptr_t)ref & G1_PARTIAL_ARRAY_MASK) == G1_PARTIAL_ARRAY_MASK; |
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1917 } |
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1918 |
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1919 // We never encode partial array oops as narrowOop*, so return false immediately. |
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1920 // This allows the compiler to create optimized code when popping references from |
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1921 // the work queue. |
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1922 inline bool has_partial_array_mask(narrowOop* ref) const { |
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1923 assert(((uintptr_t)ref & G1_PARTIAL_ARRAY_MASK) != G1_PARTIAL_ARRAY_MASK, "Partial array oop reference encoded as narrowOop*"); |
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1924 return false; |
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1925 } |
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1926 |
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1927 // Only implement set_partial_array_mask() for regular oops, not for narrowOops. |
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1928 // We always encode partial arrays as regular oop, to allow the |
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1929 // specialization for has_partial_array_mask() for narrowOops above. |
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1930 // This means that unintentional use of this method with narrowOops are caught |
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1931 // by the compiler. |
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1932 inline oop* set_partial_array_mask(oop obj) const { |
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1933 assert(((uintptr_t)(void *)obj & G1_PARTIAL_ARRAY_MASK) == 0, "Information loss!"); |
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1934 return (oop*) ((uintptr_t)(void *)obj | G1_PARTIAL_ARRAY_MASK); |
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1935 } |
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1936 |
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1937 inline oop clear_partial_array_mask(oop* ref) const { |
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1938 return cast_to_oop((intptr_t)ref & ~G1_PARTIAL_ARRAY_MASK); |
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1939 } |
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1940 |
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1941 inline void do_oop_partial_array(oop* p); |
|
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1942 |
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1943 // This method is applied to the fields of the objects that have just been copied. |
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1944 template <class T> void do_oop_evac(T* p, HeapRegion* from) { |
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1945 assert(!oopDesc::is_null(oopDesc::load_decode_heap_oop(p)), |
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1946 "Reference should not be NULL here as such are never pushed to the task queue."); |
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1947 oop obj = oopDesc::load_decode_heap_oop_not_null(p); |
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1948 |
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1949 // Although we never intentionally push references outside of the collection |
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1950 // set, due to (benign) races in the claim mechanism during RSet scanning more |
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1951 // than one thread might claim the same card. So the same card may be |
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1952 // processed multiple times. So redo this check. |
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1953 if (_g1h->in_cset_fast_test(obj)) { |
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1954 oop forwardee; |
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1955 if (obj->is_forwarded()) { |
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1956 forwardee = obj->forwardee(); |
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1957 } else { |
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1958 forwardee = copy_to_survivor_space(obj); |
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1959 } |
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1960 assert(forwardee != NULL, "forwardee should not be NULL"); |
|
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1961 oopDesc::encode_store_heap_oop(p, forwardee); |
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1962 } |
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1963 |
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1964 assert(obj != NULL, "Must be"); |
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1965 update_rs(from, p, queue_num()); |
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1966 } |
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1967 public: |
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1968 |
|
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1969 oop copy_to_survivor_space(oop const obj); |
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1970 |
|
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1971 template <class T> inline void deal_with_reference(T* ref_to_scan); |
|
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1972 |
|
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1973 inline void deal_with_reference(StarTask ref); |
|
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1974 |
|
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1975 public: |
|
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1976 void trim_queue(); |
|
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1977 }; |
| 1972 | 1978 |
| 1979 #endif // SHARE_VM_GC_IMPLEMENTATION_G1_G1COLLECTEDHEAP_HPP |