Mercurial > hg > graal-compiler
annotate src/share/vm/gc_implementation/g1/g1CollectedHeap.hpp @ 12233:40136aa2cdb1
8010722: assert: failed: heap size is too big for compressed oops
Summary: Use conservative assumptions of required alignment for the various garbage collector components into account when determining the maximum heap size that supports compressed oops. Using this conservative value avoids several circular dependencies in the calculation.
Reviewed-by: stefank, dholmes
| author | tschatzl |
|---|---|
| date | Wed, 11 Sep 2013 16:25:02 +0200 |
| parents | f7d3b4387a16 |
| children | 190899198332 d55c004e1d4d |
| rev | line source |
|---|---|
| 342 | 1 /* |
| 10405 | 2 * Copyright (c) 2001, 2013, Oracle and/or its affiliates. All rights reserved. |
| 342 | 3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
| 4 * | |
| 5 * This code is free software; you can redistribute it and/or modify it | |
| 6 * under the terms of the GNU General Public License version 2 only, as | |
| 7 * published by the Free Software Foundation. | |
| 8 * | |
| 9 * This code is distributed in the hope that it will be useful, but WITHOUT | |
| 10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or | |
| 11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License | |
| 12 * version 2 for more details (a copy is included in the LICENSE file that | |
| 13 * accompanied this code). | |
| 14 * | |
| 15 * You should have received a copy of the GNU General Public License version | |
| 16 * 2 along with this work; if not, write to the Free Software Foundation, | |
| 17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. | |
| 18 * | |
|
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19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
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20 * or visit www.oracle.com if you need additional information or have any |
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21 * questions. |
| 342 | 22 * |
| 23 */ | |
| 24 | |
| 1972 | 25 #ifndef SHARE_VM_GC_IMPLEMENTATION_G1_G1COLLECTEDHEAP_HPP |
| 26 #define SHARE_VM_GC_IMPLEMENTATION_G1_G1COLLECTEDHEAP_HPP | |
| 27 | |
| 28 #include "gc_implementation/g1/concurrentMark.hpp" | |
| 10405 | 29 #include "gc_implementation/g1/evacuationInfo.hpp" |
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30 #include "gc_implementation/g1/g1AllocRegion.hpp" |
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31 #include "gc_implementation/g1/g1HRPrinter.hpp" |
| 10405 | 32 #include "gc_implementation/g1/g1MonitoringSupport.hpp" |
| 1972 | 33 #include "gc_implementation/g1/g1RemSet.hpp" |
| 10405 | 34 #include "gc_implementation/g1/g1YCTypes.hpp" |
| 3766 | 35 #include "gc_implementation/g1/heapRegionSeq.hpp" |
| 2152 | 36 #include "gc_implementation/g1/heapRegionSets.hpp" |
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37 #include "gc_implementation/shared/hSpaceCounters.hpp" |
| 6595 | 38 #include "gc_implementation/shared/parGCAllocBuffer.hpp" |
| 1972 | 39 #include "memory/barrierSet.hpp" |
| 40 #include "memory/memRegion.hpp" | |
| 41 #include "memory/sharedHeap.hpp" | |
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42 #include "utilities/stack.hpp" |
| 1972 | 43 |
| 342 | 44 // A "G1CollectedHeap" is an implementation of a java heap for HotSpot. |
| 45 // It uses the "Garbage First" heap organization and algorithm, which | |
| 46 // may combine concurrent marking with parallel, incremental compaction of | |
| 47 // heap subsets that will yield large amounts of garbage. | |
| 48 | |
| 12080 | 49 // Forward declarations |
| 342 | 50 class HeapRegion; |
| 2173 | 51 class HRRSCleanupTask; |
| 342 | 52 class GenerationSpec; |
| 53 class OopsInHeapRegionClosure; | |
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54 class G1KlassScanClosure; |
| 342 | 55 class G1ScanHeapEvacClosure; |
| 56 class ObjectClosure; | |
| 57 class SpaceClosure; | |
| 58 class CompactibleSpaceClosure; | |
| 59 class Space; | |
| 60 class G1CollectorPolicy; | |
| 61 class GenRemSet; | |
| 62 class G1RemSet; | |
| 63 class HeapRegionRemSetIterator; | |
| 64 class ConcurrentMark; | |
| 65 class ConcurrentMarkThread; | |
| 66 class ConcurrentG1Refine; | |
| 10405 | 67 class ConcurrentGCTimer; |
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68 class GenerationCounters; |
| 10405 | 69 class STWGCTimer; |
| 70 class G1NewTracer; | |
| 71 class G1OldTracer; | |
| 72 class EvacuationFailedInfo; | |
| 12080 | 73 class nmethod; |
| 342 | 74 |
| 6197 | 75 typedef OverflowTaskQueue<StarTask, mtGC> RefToScanQueue; |
| 76 typedef GenericTaskQueueSet<RefToScanQueue, mtGC> RefToScanQueueSet; | |
| 342 | 77 |
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78 typedef int RegionIdx_t; // needs to hold [ 0..max_regions() ) |
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79 typedef int CardIdx_t; // needs to hold [ 0..CardsPerRegion ) |
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80 |
| 342 | 81 enum GCAllocPurpose { |
| 82 GCAllocForTenured, | |
| 83 GCAllocForSurvived, | |
| 84 GCAllocPurposeCount | |
| 85 }; | |
| 86 | |
| 6197 | 87 class YoungList : public CHeapObj<mtGC> { |
| 342 | 88 private: |
| 89 G1CollectedHeap* _g1h; | |
| 90 | |
| 91 HeapRegion* _head; | |
| 92 | |
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93 HeapRegion* _survivor_head; |
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94 HeapRegion* _survivor_tail; |
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95 |
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96 HeapRegion* _curr; |
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97 |
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98 uint _length; |
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99 uint _survivor_length; |
| 342 | 100 |
| 101 size_t _last_sampled_rs_lengths; | |
| 102 size_t _sampled_rs_lengths; | |
| 103 | |
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104 void empty_list(HeapRegion* list); |
| 342 | 105 |
| 106 public: | |
| 107 YoungList(G1CollectedHeap* g1h); | |
| 108 | |
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109 void push_region(HeapRegion* hr); |
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110 void add_survivor_region(HeapRegion* hr); |
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111 |
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112 void empty_list(); |
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113 bool is_empty() { return _length == 0; } |
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114 uint length() { return _length; } |
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115 uint survivor_length() { return _survivor_length; } |
| 342 | 116 |
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117 // Currently we do not keep track of the used byte sum for the |
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118 // young list and the survivors and it'd be quite a lot of work to |
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119 // do so. When we'll eventually replace the young list with |
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120 // instances of HeapRegionLinkedList we'll get that for free. So, |
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121 // we'll report the more accurate information then. |
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122 size_t eden_used_bytes() { |
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123 assert(length() >= survivor_length(), "invariant"); |
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124 return (size_t) (length() - survivor_length()) * HeapRegion::GrainBytes; |
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125 } |
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126 size_t survivor_used_bytes() { |
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127 return (size_t) survivor_length() * HeapRegion::GrainBytes; |
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128 } |
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129 |
| 342 | 130 void rs_length_sampling_init(); |
| 131 bool rs_length_sampling_more(); | |
| 132 void rs_length_sampling_next(); | |
| 133 | |
| 134 void reset_sampled_info() { | |
| 135 _last_sampled_rs_lengths = 0; | |
| 136 } | |
| 137 size_t sampled_rs_lengths() { return _last_sampled_rs_lengths; } | |
| 138 | |
| 139 // for development purposes | |
| 140 void reset_auxilary_lists(); | |
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141 void clear() { _head = NULL; _length = 0; } |
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142 |
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143 void clear_survivors() { |
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144 _survivor_head = NULL; |
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145 _survivor_tail = NULL; |
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146 _survivor_length = 0; |
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147 } |
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148 |
| 342 | 149 HeapRegion* first_region() { return _head; } |
| 150 HeapRegion* first_survivor_region() { return _survivor_head; } | |
| 545 | 151 HeapRegion* last_survivor_region() { return _survivor_tail; } |
| 342 | 152 |
| 153 // debugging | |
| 154 bool check_list_well_formed(); | |
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155 bool check_list_empty(bool check_sample = true); |
| 342 | 156 void print(); |
| 157 }; | |
| 158 | |
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159 class MutatorAllocRegion : public G1AllocRegion { |
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160 protected: |
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161 virtual HeapRegion* allocate_new_region(size_t word_size, bool force); |
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162 virtual void retire_region(HeapRegion* alloc_region, size_t allocated_bytes); |
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163 public: |
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164 MutatorAllocRegion() |
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165 : G1AllocRegion("Mutator Alloc Region", false /* bot_updates */) { } |
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166 }; |
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167 |
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168 class SurvivorGCAllocRegion : public G1AllocRegion { |
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169 protected: |
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170 virtual HeapRegion* allocate_new_region(size_t word_size, bool force); |
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171 virtual void retire_region(HeapRegion* alloc_region, size_t allocated_bytes); |
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172 public: |
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173 SurvivorGCAllocRegion() |
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174 : G1AllocRegion("Survivor GC Alloc Region", false /* bot_updates */) { } |
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175 }; |
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176 |
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177 class OldGCAllocRegion : public G1AllocRegion { |
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178 protected: |
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179 virtual HeapRegion* allocate_new_region(size_t word_size, bool force); |
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180 virtual void retire_region(HeapRegion* alloc_region, size_t allocated_bytes); |
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181 public: |
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182 OldGCAllocRegion() |
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183 : G1AllocRegion("Old GC Alloc Region", true /* bot_updates */) { } |
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184 }; |
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185 |
| 12080 | 186 // The G1 STW is alive closure. |
| 187 // An instance is embedded into the G1CH and used as the | |
| 188 // (optional) _is_alive_non_header closure in the STW | |
| 189 // reference processor. It is also extensively used during | |
| 190 // reference processing during STW evacuation pauses. | |
| 191 class G1STWIsAliveClosure: public BoolObjectClosure { | |
| 192 G1CollectedHeap* _g1; | |
| 193 public: | |
| 194 G1STWIsAliveClosure(G1CollectedHeap* g1) : _g1(g1) {} | |
| 195 bool do_object_b(oop p); | |
| 196 }; | |
| 197 | |
| 342 | 198 class RefineCardTableEntryClosure; |
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199 |
| 342 | 200 class G1CollectedHeap : public SharedHeap { |
| 201 friend class VM_G1CollectForAllocation; | |
| 202 friend class VM_G1CollectFull; | |
| 203 friend class VM_G1IncCollectionPause; | |
| 204 friend class VMStructs; | |
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205 friend class MutatorAllocRegion; |
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206 friend class SurvivorGCAllocRegion; |
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207 friend class OldGCAllocRegion; |
| 342 | 208 |
| 209 // Closures used in implementation. | |
| 5987 | 210 template <bool do_gen_barrier, G1Barrier barrier, bool do_mark_object> |
| 211 friend class G1ParCopyClosure; | |
| 342 | 212 friend class G1IsAliveClosure; |
| 213 friend class G1EvacuateFollowersClosure; | |
| 214 friend class G1ParScanThreadState; | |
| 215 friend class G1ParScanClosureSuper; | |
| 216 friend class G1ParEvacuateFollowersClosure; | |
| 217 friend class G1ParTask; | |
| 218 friend class G1FreeGarbageRegionClosure; | |
| 219 friend class RefineCardTableEntryClosure; | |
| 220 friend class G1PrepareCompactClosure; | |
| 221 friend class RegionSorter; | |
| 2152 | 222 friend class RegionResetter; |
| 342 | 223 friend class CountRCClosure; |
| 224 friend class EvacPopObjClosure; | |
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225 friend class G1ParCleanupCTTask; |
| 342 | 226 |
| 227 // Other related classes. | |
| 228 friend class G1MarkSweep; | |
| 229 | |
| 230 private: | |
| 231 // The one and only G1CollectedHeap, so static functions can find it. | |
| 232 static G1CollectedHeap* _g1h; | |
| 233 | |
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234 static size_t _humongous_object_threshold_in_words; |
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235 |
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236 // Storage for the G1 heap. |
| 342 | 237 VirtualSpace _g1_storage; |
| 238 MemRegion _g1_reserved; | |
| 239 | |
| 240 // The part of _g1_storage that is currently committed. | |
| 241 MemRegion _g1_committed; | |
| 242 | |
| 2152 | 243 // The master free list. It will satisfy all new region allocations. |
| 244 MasterFreeRegionList _free_list; | |
| 245 | |
| 246 // The secondary free list which contains regions that have been | |
| 247 // freed up during the cleanup process. This will be appended to the | |
| 248 // master free list when appropriate. | |
| 249 SecondaryFreeRegionList _secondary_free_list; | |
| 250 | |
| 4072 | 251 // It keeps track of the old regions. |
| 252 MasterOldRegionSet _old_set; | |
| 253 | |
| 2152 | 254 // It keeps track of the humongous regions. |
| 255 MasterHumongousRegionSet _humongous_set; | |
| 342 | 256 |
| 257 // The number of regions we could create by expansion. | |
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258 uint _expansion_regions; |
| 342 | 259 |
| 260 // The block offset table for the G1 heap. | |
| 261 G1BlockOffsetSharedArray* _bot_shared; | |
| 262 | |
| 4072 | 263 // Tears down the region sets / lists so that they are empty and the |
| 264 // regions on the heap do not belong to a region set / list. The | |
| 265 // only exception is the humongous set which we leave unaltered. If | |
| 266 // free_list_only is true, it will only tear down the master free | |
| 267 // list. It is called before a Full GC (free_list_only == false) or | |
| 268 // before heap shrinking (free_list_only == true). | |
| 269 void tear_down_region_sets(bool free_list_only); | |
| 270 | |
| 271 // Rebuilds the region sets / lists so that they are repopulated to | |
| 272 // reflect the contents of the heap. The only exception is the | |
| 273 // humongous set which was not torn down in the first place. If | |
| 274 // free_list_only is true, it will only rebuild the master free | |
| 275 // list. It is called after a Full GC (free_list_only == false) or | |
| 276 // after heap shrinking (free_list_only == true). | |
| 277 void rebuild_region_sets(bool free_list_only); | |
| 342 | 278 |
| 279 // The sequence of all heap regions in the heap. | |
| 3766 | 280 HeapRegionSeq _hrs; |
| 342 | 281 |
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282 // Alloc region used to satisfy mutator allocation requests. |
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283 MutatorAllocRegion _mutator_alloc_region; |
| 342 | 284 |
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285 // Alloc region used to satisfy allocation requests by the GC for |
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286 // survivor objects. |
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287 SurvivorGCAllocRegion _survivor_gc_alloc_region; |
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288 |
| 6595 | 289 // PLAB sizing policy for survivors. |
| 290 PLABStats _survivor_plab_stats; | |
| 291 | |
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292 // Alloc region used to satisfy allocation requests by the GC for |
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293 // old objects. |
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294 OldGCAllocRegion _old_gc_alloc_region; |
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295 |
| 6595 | 296 // PLAB sizing policy for tenured objects. |
| 297 PLABStats _old_plab_stats; | |
| 298 | |
| 299 PLABStats* stats_for_purpose(GCAllocPurpose purpose) { | |
| 300 PLABStats* stats = NULL; | |
| 301 | |
| 302 switch (purpose) { | |
| 303 case GCAllocForSurvived: | |
| 304 stats = &_survivor_plab_stats; | |
| 305 break; | |
| 306 case GCAllocForTenured: | |
| 307 stats = &_old_plab_stats; | |
| 308 break; | |
| 309 default: | |
| 310 assert(false, "unrecognized GCAllocPurpose"); | |
| 311 } | |
| 312 | |
| 313 return stats; | |
| 314 } | |
| 315 | |
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316 // The last old region we allocated to during the last GC. |
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317 // Typically, it is not full so we should re-use it during the next GC. |
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318 HeapRegion* _retained_old_gc_alloc_region; |
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319 |
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320 // It specifies whether we should attempt to expand the heap after a |
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321 // region allocation failure. If heap expansion fails we set this to |
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322 // false so that we don't re-attempt the heap expansion (it's likely |
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323 // that subsequent expansion attempts will also fail if one fails). |
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324 // Currently, it is only consulted during GC and it's reset at the |
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325 // start of each GC. |
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326 bool _expand_heap_after_alloc_failure; |
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327 |
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328 // It resets the mutator alloc region before new allocations can take place. |
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329 void init_mutator_alloc_region(); |
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330 |
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331 // It releases the mutator alloc region. |
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332 void release_mutator_alloc_region(); |
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333 |
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334 // It initializes the GC alloc regions at the start of a GC. |
| 10405 | 335 void init_gc_alloc_regions(EvacuationInfo& evacuation_info); |
| 342 | 336 |
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337 // It releases the GC alloc regions at the end of a GC. |
| 10405 | 338 void release_gc_alloc_regions(uint no_of_gc_workers, EvacuationInfo& evacuation_info); |
| 342 | 339 |
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340 // It does any cleanup that needs to be done on the GC alloc regions |
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341 // before a Full GC. |
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342 void abandon_gc_alloc_regions(); |
| 342 | 343 |
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344 // Helper for monitoring and management support. |
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345 G1MonitoringSupport* _g1mm; |
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346 |
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347 // Determines PLAB size for a particular allocation purpose. |
| 6595 | 348 size_t desired_plab_sz(GCAllocPurpose purpose); |
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349 |
| 342 | 350 // Outside of GC pauses, the number of bytes used in all regions other |
| 351 // than the current allocation region. | |
| 352 size_t _summary_bytes_used; | |
| 353 | |
| 526 | 354 // This is used for a quick test on whether a reference points into |
| 355 // the collection set or not. Basically, we have an array, with one | |
| 356 // byte per region, and that byte denotes whether the corresponding | |
| 357 // region is in the collection set or not. The entry corresponding | |
| 358 // the bottom of the heap, i.e., region 0, is pointed to by | |
| 359 // _in_cset_fast_test_base. The _in_cset_fast_test field has been | |
| 360 // biased so that it actually points to address 0 of the address | |
| 361 // space, to make the test as fast as possible (we can simply shift | |
| 362 // the address to address into it, instead of having to subtract the | |
| 363 // bottom of the heap from the address before shifting it; basically | |
| 364 // it works in the same way the card table works). | |
| 365 bool* _in_cset_fast_test; | |
| 366 | |
| 367 // The allocated array used for the fast test on whether a reference | |
| 368 // points into the collection set or not. This field is also used to | |
| 369 // free the array. | |
| 370 bool* _in_cset_fast_test_base; | |
| 371 | |
| 372 // The length of the _in_cset_fast_test_base array. | |
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373 uint _in_cset_fast_test_length; |
| 526 | 374 |
|
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375 volatile unsigned _gc_time_stamp; |
| 342 | 376 |
| 377 size_t* _surviving_young_words; | |
| 378 | |
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379 G1HRPrinter _hr_printer; |
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380 |
| 342 | 381 void setup_surviving_young_words(); |
| 382 void update_surviving_young_words(size_t* surv_young_words); | |
| 383 void cleanup_surviving_young_words(); | |
| 384 | |
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385 // It decides whether an explicit GC should start a concurrent cycle |
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386 // instead of doing a STW GC. Currently, a concurrent cycle is |
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387 // explicitly started if: |
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388 // (a) cause == _gc_locker and +GCLockerInvokesConcurrent, or |
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389 // (b) cause == _java_lang_system_gc and +ExplicitGCInvokesConcurrent. |
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390 // (c) cause == _g1_humongous_allocation |
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391 bool should_do_concurrent_full_gc(GCCause::Cause cause); |
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392 |
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393 // Keeps track of how many "old marking cycles" (i.e., Full GCs or |
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394 // concurrent cycles) we have started. |
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395 volatile unsigned int _old_marking_cycles_started; |
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396 |
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397 // Keeps track of how many "old marking cycles" (i.e., Full GCs or |
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398 // concurrent cycles) we have completed. |
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399 volatile unsigned int _old_marking_cycles_completed; |
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400 |
| 10405 | 401 bool _concurrent_cycle_started; |
| 402 | |
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403 // This is a non-product method that is helpful for testing. It is |
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404 // called at the end of a GC and artificially expands the heap by |
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405 // allocating a number of dead regions. This way we can induce very |
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406 // frequent marking cycles and stress the cleanup / concurrent |
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407 // cleanup code more (as all the regions that will be allocated by |
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408 // this method will be found dead by the marking cycle). |
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409 void allocate_dummy_regions() PRODUCT_RETURN; |
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410 |
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411 // Clear RSets after a compaction. It also resets the GC time stamps. |
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412 void clear_rsets_post_compaction(); |
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413 |
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414 // If the HR printer is active, dump the state of the regions in the |
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415 // heap after a compaction. |
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416 void print_hrs_post_compaction(); |
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417 |
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418 double verify(bool guard, const char* msg); |
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419 void verify_before_gc(); |
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420 void verify_after_gc(); |
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421 |
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422 void log_gc_header(); |
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423 void log_gc_footer(double pause_time_sec); |
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424 |
| 1973 | 425 // These are macros so that, if the assert fires, we get the correct |
| 426 // line number, file, etc. | |
| 427 | |
| 2361 | 428 #define heap_locking_asserts_err_msg(_extra_message_) \ |
| 2152 | 429 err_msg("%s : Heap_lock locked: %s, at safepoint: %s, is VM thread: %s", \ |
| 2361 | 430 (_extra_message_), \ |
| 2152 | 431 BOOL_TO_STR(Heap_lock->owned_by_self()), \ |
| 432 BOOL_TO_STR(SafepointSynchronize::is_at_safepoint()), \ | |
| 433 BOOL_TO_STR(Thread::current()->is_VM_thread())) | |
| 1973 | 434 |
| 435 #define assert_heap_locked() \ | |
| 436 do { \ | |
| 437 assert(Heap_lock->owned_by_self(), \ | |
| 438 heap_locking_asserts_err_msg("should be holding the Heap_lock")); \ | |
| 439 } while (0) | |
| 440 | |
| 2361 | 441 #define assert_heap_locked_or_at_safepoint(_should_be_vm_thread_) \ |
| 1973 | 442 do { \ |
| 443 assert(Heap_lock->owned_by_self() || \ | |
| 2152 | 444 (SafepointSynchronize::is_at_safepoint() && \ |
| 2361 | 445 ((_should_be_vm_thread_) == Thread::current()->is_VM_thread())), \ |
| 1973 | 446 heap_locking_asserts_err_msg("should be holding the Heap_lock or " \ |
| 447 "should be at a safepoint")); \ | |
| 448 } while (0) | |
| 449 | |
| 450 #define assert_heap_locked_and_not_at_safepoint() \ | |
| 451 do { \ | |
| 452 assert(Heap_lock->owned_by_self() && \ | |
| 453 !SafepointSynchronize::is_at_safepoint(), \ | |
| 454 heap_locking_asserts_err_msg("should be holding the Heap_lock and " \ | |
| 455 "should not be at a safepoint")); \ | |
| 456 } while (0) | |
| 457 | |
| 458 #define assert_heap_not_locked() \ | |
| 459 do { \ | |
| 460 assert(!Heap_lock->owned_by_self(), \ | |
| 461 heap_locking_asserts_err_msg("should not be holding the Heap_lock")); \ | |
| 462 } while (0) | |
| 463 | |
| 464 #define assert_heap_not_locked_and_not_at_safepoint() \ | |
| 465 do { \ | |
| 466 assert(!Heap_lock->owned_by_self() && \ | |
| 467 !SafepointSynchronize::is_at_safepoint(), \ | |
| 468 heap_locking_asserts_err_msg("should not be holding the Heap_lock and " \ | |
| 469 "should not be at a safepoint")); \ | |
| 470 } while (0) | |
| 471 | |
| 2361 | 472 #define assert_at_safepoint(_should_be_vm_thread_) \ |
| 1973 | 473 do { \ |
| 2152 | 474 assert(SafepointSynchronize::is_at_safepoint() && \ |
| 2361 | 475 ((_should_be_vm_thread_) == Thread::current()->is_VM_thread()), \ |
| 1973 | 476 heap_locking_asserts_err_msg("should be at a safepoint")); \ |
| 477 } while (0) | |
| 478 | |
| 479 #define assert_not_at_safepoint() \ | |
| 480 do { \ | |
| 481 assert(!SafepointSynchronize::is_at_safepoint(), \ | |
| 482 heap_locking_asserts_err_msg("should not be at a safepoint")); \ | |
| 483 } while (0) | |
| 484 | |
| 342 | 485 protected: |
| 486 | |
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487 // The young region list. |
| 342 | 488 YoungList* _young_list; |
| 489 | |
| 490 // The current policy object for the collector. | |
| 491 G1CollectorPolicy* _g1_policy; | |
| 492 | |
| 2152 | 493 // This is the second level of trying to allocate a new region. If |
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494 // new_region() didn't find a region on the free_list, this call will |
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495 // check whether there's anything available on the |
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496 // secondary_free_list and/or wait for more regions to appear on |
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497 // that list, if _free_regions_coming is set. |
| 2361 | 498 HeapRegion* new_region_try_secondary_free_list(); |
| 342 | 499 |
| 2361 | 500 // Try to allocate a single non-humongous HeapRegion sufficient for |
| 501 // an allocation of the given word_size. If do_expand is true, | |
| 502 // attempt to expand the heap if necessary to satisfy the allocation | |
| 503 // request. | |
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504 HeapRegion* new_region(size_t word_size, bool do_expand); |
| 342 | 505 |
| 2361 | 506 // Attempt to satisfy a humongous allocation request of the given |
| 507 // size by finding a contiguous set of free regions of num_regions | |
| 508 // length and remove them from the master free list. Return the | |
| 3766 | 509 // index of the first region or G1_NULL_HRS_INDEX if the search |
| 510 // was unsuccessful. | |
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511 uint humongous_obj_allocate_find_first(uint num_regions, |
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512 size_t word_size); |
| 342 | 513 |
| 2361 | 514 // Initialize a contiguous set of free regions of length num_regions |
| 515 // and starting at index first so that they appear as a single | |
| 516 // humongous region. | |
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517 HeapWord* humongous_obj_allocate_initialize_regions(uint first, |
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518 uint num_regions, |
| 2361 | 519 size_t word_size); |
| 520 | |
| 521 // Attempt to allocate a humongous object of the given size. Return | |
| 522 // NULL if unsuccessful. | |
| 2152 | 523 HeapWord* humongous_obj_allocate(size_t word_size); |
| 1973 | 524 |
| 525 // The following two methods, allocate_new_tlab() and | |
| 526 // mem_allocate(), are the two main entry points from the runtime | |
| 527 // into the G1's allocation routines. They have the following | |
| 528 // assumptions: | |
| 529 // | |
| 530 // * They should both be called outside safepoints. | |
| 531 // | |
| 532 // * They should both be called without holding the Heap_lock. | |
| 533 // | |
| 534 // * All allocation requests for new TLABs should go to | |
| 535 // allocate_new_tlab(). | |
| 536 // | |
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537 // * All non-TLAB allocation requests should go to mem_allocate(). |
| 1973 | 538 // |
| 539 // * If either call cannot satisfy the allocation request using the | |
| 540 // current allocating region, they will try to get a new one. If | |
| 541 // this fails, they will attempt to do an evacuation pause and | |
| 542 // retry the allocation. | |
| 543 // | |
| 544 // * If all allocation attempts fail, even after trying to schedule | |
| 545 // an evacuation pause, allocate_new_tlab() will return NULL, | |
| 546 // whereas mem_allocate() will attempt a heap expansion and/or | |
| 547 // schedule a Full GC. | |
| 548 // | |
| 549 // * We do not allow humongous-sized TLABs. So, allocate_new_tlab | |
| 550 // should never be called with word_size being humongous. All | |
| 551 // humongous allocation requests should go to mem_allocate() which | |
| 552 // will satisfy them with a special path. | |
| 553 | |
| 554 virtual HeapWord* allocate_new_tlab(size_t word_size); | |
| 555 | |
| 556 virtual HeapWord* mem_allocate(size_t word_size, | |
| 557 bool* gc_overhead_limit_was_exceeded); | |
| 342 | 558 |
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559 // The following three methods take a gc_count_before_ret |
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560 // parameter which is used to return the GC count if the method |
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561 // returns NULL. Given that we are required to read the GC count |
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562 // while holding the Heap_lock, and these paths will take the |
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563 // Heap_lock at some point, it's easier to get them to read the GC |
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564 // count while holding the Heap_lock before they return NULL instead |
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565 // of the caller (namely: mem_allocate()) having to also take the |
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566 // Heap_lock just to read the GC count. |
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567 |
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568 // First-level mutator allocation attempt: try to allocate out of |
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569 // the mutator alloc region without taking the Heap_lock. This |
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570 // should only be used for non-humongous allocations. |
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571 inline HeapWord* attempt_allocation(size_t word_size, |
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572 unsigned int* gc_count_before_ret, |
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573 int* gclocker_retry_count_ret); |
| 342 | 574 |
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575 // Second-level mutator allocation attempt: take the Heap_lock and |
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576 // retry the allocation attempt, potentially scheduling a GC |
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577 // pause. This should only be used for non-humongous allocations. |
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578 HeapWord* attempt_allocation_slow(size_t word_size, |
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579 unsigned int* gc_count_before_ret, |
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580 int* gclocker_retry_count_ret); |
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581 |
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582 // Takes the Heap_lock and attempts a humongous allocation. It can |
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583 // potentially schedule a GC pause. |
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584 HeapWord* attempt_allocation_humongous(size_t word_size, |
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585 unsigned int* gc_count_before_ret, |
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586 int* gclocker_retry_count_ret); |
| 1973 | 587 |
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588 // Allocation attempt that should be called during safepoints (e.g., |
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589 // at the end of a successful GC). expect_null_mutator_alloc_region |
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590 // specifies whether the mutator alloc region is expected to be NULL |
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591 // or not. |
| 1973 | 592 HeapWord* attempt_allocation_at_safepoint(size_t word_size, |
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593 bool expect_null_mutator_alloc_region); |
| 1973 | 594 |
| 595 // It dirties the cards that cover the block so that so that the post | |
| 596 // write barrier never queues anything when updating objects on this | |
| 597 // block. It is assumed (and in fact we assert) that the block | |
| 598 // belongs to a young region. | |
| 599 inline void dirty_young_block(HeapWord* start, size_t word_size); | |
| 342 | 600 |
| 601 // Allocate blocks during garbage collection. Will ensure an | |
| 602 // allocation region, either by picking one or expanding the | |
| 603 // heap, and then allocate a block of the given size. The block | |
| 604 // may not be a humongous - it must fit into a single heap region. | |
| 605 HeapWord* par_allocate_during_gc(GCAllocPurpose purpose, size_t word_size); | |
| 606 | |
| 607 // Ensure that no further allocations can happen in "r", bearing in mind | |
| 608 // that parallel threads might be attempting allocations. | |
| 609 void par_allocate_remaining_space(HeapRegion* r); | |
| 610 | |
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611 // Allocation attempt during GC for a survivor object / PLAB. |
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612 inline HeapWord* survivor_attempt_allocation(size_t word_size); |
| 545 | 613 |
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614 // Allocation attempt during GC for an old object / PLAB. |
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615 inline HeapWord* old_attempt_allocation(size_t word_size); |
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616 |
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617 // These methods are the "callbacks" from the G1AllocRegion class. |
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618 |
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619 // For mutator alloc regions. |
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620 HeapRegion* new_mutator_alloc_region(size_t word_size, bool force); |
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621 void retire_mutator_alloc_region(HeapRegion* alloc_region, |
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622 size_t allocated_bytes); |
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623 |
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624 // For GC alloc regions. |
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625 HeapRegion* new_gc_alloc_region(size_t word_size, uint count, |
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626 GCAllocPurpose ap); |
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627 void retire_gc_alloc_region(HeapRegion* alloc_region, |
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628 size_t allocated_bytes, GCAllocPurpose ap); |
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629 |
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630 // - if explicit_gc is true, the GC is for a System.gc() or a heap |
| 1973 | 631 // inspection request and should collect the entire heap |
| 632 // - if clear_all_soft_refs is true, all soft references should be | |
| 633 // cleared during the GC | |
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634 // - if explicit_gc is false, word_size describes the allocation that |
| 1973 | 635 // the GC should attempt (at least) to satisfy |
| 636 // - it returns false if it is unable to do the collection due to the | |
| 637 // GC locker being active, true otherwise | |
| 638 bool do_collection(bool explicit_gc, | |
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639 bool clear_all_soft_refs, |
| 342 | 640 size_t word_size); |
| 641 | |
| 642 // Callback from VM_G1CollectFull operation. | |
| 643 // Perform a full collection. | |
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644 virtual void do_full_collection(bool clear_all_soft_refs); |
| 342 | 645 |
| 646 // Resize the heap if necessary after a full collection. If this is | |
| 647 // after a collect-for allocation, "word_size" is the allocation size, | |
| 648 // and will be considered part of the used portion of the heap. | |
| 649 void resize_if_necessary_after_full_collection(size_t word_size); | |
| 650 | |
| 651 // Callback from VM_G1CollectForAllocation operation. | |
| 652 // This function does everything necessary/possible to satisfy a | |
| 653 // failed allocation request (including collection, expansion, etc.) | |
| 1973 | 654 HeapWord* satisfy_failed_allocation(size_t word_size, bool* succeeded); |
| 342 | 655 |
| 656 // Attempting to expand the heap sufficiently | |
| 657 // to support an allocation of the given "word_size". If | |
| 658 // successful, perform the allocation and return the address of the | |
| 659 // allocated block, or else "NULL". | |
| 1973 | 660 HeapWord* expand_and_allocate(size_t word_size); |
| 342 | 661 |
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662 // Process any reference objects discovered during |
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663 // an incremental evacuation pause. |
| 6819 | 664 void process_discovered_references(uint no_of_gc_workers); |
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665 |
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666 // Enqueue any remaining discovered references |
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667 // after processing. |
| 6819 | 668 void enqueue_discovered_references(uint no_of_gc_workers); |
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669 |
| 342 | 670 public: |
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671 |
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672 G1MonitoringSupport* g1mm() { |
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673 assert(_g1mm != NULL, "should have been initialized"); |
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674 return _g1mm; |
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675 } |
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676 |
| 342 | 677 // Expand the garbage-first heap by at least the given size (in bytes!). |
|
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678 // Returns true if the heap was expanded by the requested amount; |
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679 // false otherwise. |
| 342 | 680 // (Rounds up to a HeapRegion boundary.) |
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681 bool expand(size_t expand_bytes); |
| 342 | 682 |
| 683 // Do anything common to GC's. | |
| 684 virtual void gc_prologue(bool full); | |
| 685 virtual void gc_epilogue(bool full); | |
| 686 | |
| 526 | 687 // We register a region with the fast "in collection set" test. We |
| 688 // simply set to true the array slot corresponding to this region. | |
| 689 void register_region_with_in_cset_fast_test(HeapRegion* r) { | |
| 690 assert(_in_cset_fast_test_base != NULL, "sanity"); | |
| 691 assert(r->in_collection_set(), "invariant"); | |
|
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692 uint index = r->hrs_index(); |
| 3766 | 693 assert(index < _in_cset_fast_test_length, "invariant"); |
| 526 | 694 assert(!_in_cset_fast_test_base[index], "invariant"); |
| 695 _in_cset_fast_test_base[index] = true; | |
| 696 } | |
| 697 | |
| 698 // This is a fast test on whether a reference points into the | |
| 699 // collection set or not. It does not assume that the reference | |
| 700 // points into the heap; if it doesn't, it will return false. | |
| 701 bool in_cset_fast_test(oop obj) { | |
| 702 assert(_in_cset_fast_test != NULL, "sanity"); | |
| 703 if (_g1_committed.contains((HeapWord*) obj)) { | |
| 704 // no need to subtract the bottom of the heap from obj, | |
| 705 // _in_cset_fast_test is biased | |
|
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706 uintx index = (uintx) obj >> HeapRegion::LogOfHRGrainBytes; |
| 526 | 707 bool ret = _in_cset_fast_test[index]; |
| 708 // let's make sure the result is consistent with what the slower | |
| 709 // test returns | |
| 710 assert( ret || !obj_in_cs(obj), "sanity"); | |
| 711 assert(!ret || obj_in_cs(obj), "sanity"); | |
| 712 return ret; | |
| 713 } else { | |
| 714 return false; | |
| 715 } | |
| 716 } | |
| 717 | |
|
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718 void clear_cset_fast_test() { |
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719 assert(_in_cset_fast_test_base != NULL, "sanity"); |
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720 memset(_in_cset_fast_test_base, false, |
|
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721 (size_t) _in_cset_fast_test_length * sizeof(bool)); |
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722 } |
|
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723 |
|
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724 // This is called at the start of either a concurrent cycle or a Full |
|
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725 // GC to update the number of old marking cycles started. |
|
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726 void increment_old_marking_cycles_started(); |
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727 |
|
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728 // This is called at the end of either a concurrent cycle or a Full |
|
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729 // GC to update the number of old marking cycles completed. Those two |
|
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730 // can happen in a nested fashion, i.e., we start a concurrent |
|
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731 // cycle, a Full GC happens half-way through it which ends first, |
|
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732 // and then the cycle notices that a Full GC happened and ends |
|
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733 // too. The concurrent parameter is a boolean to help us do a bit |
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734 // tighter consistency checking in the method. If concurrent is |
|
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735 // false, the caller is the inner caller in the nesting (i.e., the |
|
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736 // Full GC). If concurrent is true, the caller is the outer caller |
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737 // in this nesting (i.e., the concurrent cycle). Further nesting is |
|
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738 // not currently supported. The end of this call also notifies |
|
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739 // the FullGCCount_lock in case a Java thread is waiting for a full |
|
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740 // GC to happen (e.g., it called System.gc() with |
|
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741 // +ExplicitGCInvokesConcurrent). |
|
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742 void increment_old_marking_cycles_completed(bool concurrent); |
|
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743 |
|
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744 unsigned int old_marking_cycles_completed() { |
|
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745 return _old_marking_cycles_completed; |
|
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746 } |
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747 |
| 10405 | 748 void register_concurrent_cycle_start(jlong start_time); |
| 749 void register_concurrent_cycle_end(); | |
| 750 void trace_heap_after_concurrent_cycle(); | |
| 751 | |
| 752 G1YCType yc_type(); | |
| 753 | |
|
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754 G1HRPrinter* hr_printer() { return &_hr_printer; } |
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755 |
| 342 | 756 protected: |
| 757 | |
| 758 // Shrink the garbage-first heap by at most the given size (in bytes!). | |
| 759 // (Rounds down to a HeapRegion boundary.) | |
| 760 virtual void shrink(size_t expand_bytes); | |
| 761 void shrink_helper(size_t expand_bytes); | |
| 762 | |
| 1709 | 763 #if TASKQUEUE_STATS |
| 764 static void print_taskqueue_stats_hdr(outputStream* const st = gclog_or_tty); | |
| 765 void print_taskqueue_stats(outputStream* const st = gclog_or_tty) const; | |
| 766 void reset_taskqueue_stats(); | |
| 767 #endif // TASKQUEUE_STATS | |
| 768 | |
| 1973 | 769 // Schedule the VM operation that will do an evacuation pause to |
| 770 // satisfy an allocation request of word_size. *succeeded will | |
| 771 // return whether the VM operation was successful (it did do an | |
| 772 // evacuation pause) or not (another thread beat us to it or the GC | |
| 773 // locker was active). Given that we should not be holding the | |
| 774 // Heap_lock when we enter this method, we will pass the | |
| 775 // gc_count_before (i.e., total_collections()) as a parameter since | |
| 776 // it has to be read while holding the Heap_lock. Currently, both | |
| 777 // methods that call do_collection_pause() release the Heap_lock | |
| 778 // before the call, so it's easy to read gc_count_before just before. | |
|
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779 HeapWord* do_collection_pause(size_t word_size, |
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780 unsigned int gc_count_before, |
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781 bool* succeeded, |
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782 GCCause::Cause gc_cause); |
| 342 | 783 |
| 784 // The guts of the incremental collection pause, executed by the vm | |
| 1973 | 785 // thread. It returns false if it is unable to do the collection due |
| 786 // to the GC locker being active, true otherwise | |
| 787 bool do_collection_pause_at_safepoint(double target_pause_time_ms); | |
| 342 | 788 |
| 789 // Actually do the work of evacuating the collection set. | |
| 10405 | 790 void evacuate_collection_set(EvacuationInfo& evacuation_info); |
| 342 | 791 |
| 792 // The g1 remembered set of the heap. | |
| 793 G1RemSet* _g1_rem_set; | |
| 794 // And it's mod ref barrier set, used to track updates for the above. | |
| 795 ModRefBarrierSet* _mr_bs; | |
| 796 | |
|
616
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797 // A set of cards that cover the objects for which the Rsets should be updated |
|
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798 // concurrently after the collection. |
|
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799 DirtyCardQueueSet _dirty_card_queue_set; |
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800 |
| 342 | 801 // The closure used to refine a single card. |
| 802 RefineCardTableEntryClosure* _refine_cte_cl; | |
| 803 | |
| 804 // A function to check the consistency of dirty card logs. | |
| 805 void check_ct_logs_at_safepoint(); | |
| 806 | |
| 1705 | 807 // A DirtyCardQueueSet that is used to hold cards that contain |
| 808 // references into the current collection set. This is used to | |
| 809 // update the remembered sets of the regions in the collection | |
| 810 // set in the event of an evacuation failure. | |
| 811 DirtyCardQueueSet _into_cset_dirty_card_queue_set; | |
| 812 | |
| 342 | 813 // After a collection pause, make the regions in the CS into free |
| 814 // regions. | |
| 10405 | 815 void free_collection_set(HeapRegion* cs_head, EvacuationInfo& evacuation_info); |
| 342 | 816 |
|
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817 // Abandon the current collection set without recording policy |
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818 // statistics or updating free lists. |
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819 void abandon_collection_set(HeapRegion* cs_head); |
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820 |
| 342 | 821 // Applies "scan_non_heap_roots" to roots outside the heap, |
| 822 // "scan_rs" to roots inside the heap (having done "set_region" to | |
|
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823 // indicate the region in which the root resides), |
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824 // and does "scan_metadata" If "scan_rs" is |
| 342 | 825 // NULL, then this step is skipped. The "worker_i" |
| 826 // param is for use with parallel roots processing, and should be | |
| 827 // the "i" of the calling parallel worker thread's work(i) function. | |
| 828 // In the sequential case this param will be ignored. | |
|
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829 void g1_process_strong_roots(bool is_scavenging, |
|
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830 ScanningOption so, |
| 342 | 831 OopClosure* scan_non_heap_roots, |
| 832 OopsInHeapRegionClosure* scan_rs, | |
|
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833 G1KlassScanClosure* scan_klasses, |
| 342 | 834 int worker_i); |
| 835 | |
| 836 // Apply "blk" to all the weak roots of the system. These include | |
| 837 // JNI weak roots, the code cache, system dictionary, symbol table, | |
| 838 // string table, and referents of reachable weak refs. | |
|
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839 void g1_process_weak_roots(OopClosure* root_closure); |
| 342 | 840 |
| 2361 | 841 // Frees a non-humongous region by initializing its contents and |
| 2152 | 842 // adding it to the free list that's passed as a parameter (this is |
| 843 // usually a local list which will be appended to the master free | |
| 844 // list later). The used bytes of freed regions are accumulated in | |
| 845 // pre_used. If par is true, the region's RSet will not be freed | |
| 846 // up. The assumption is that this will be done later. | |
| 847 void free_region(HeapRegion* hr, | |
| 848 size_t* pre_used, | |
| 849 FreeRegionList* free_list, | |
| 850 bool par); | |
| 342 | 851 |
| 2361 | 852 // Frees a humongous region by collapsing it into individual regions |
| 853 // and calling free_region() for each of them. The freed regions | |
| 854 // will be added to the free list that's passed as a parameter (this | |
| 855 // is usually a local list which will be appended to the master free | |
| 856 // list later). The used bytes of freed regions are accumulated in | |
| 857 // pre_used. If par is true, the region's RSet will not be freed | |
| 858 // up. The assumption is that this will be done later. | |
| 2152 | 859 void free_humongous_region(HeapRegion* hr, |
| 860 size_t* pre_used, | |
| 861 FreeRegionList* free_list, | |
| 862 HumongousRegionSet* humongous_proxy_set, | |
| 863 bool par); | |
| 342 | 864 |
| 3766 | 865 // Notifies all the necessary spaces that the committed space has |
| 866 // been updated (either expanded or shrunk). It should be called | |
| 867 // after _g1_storage is updated. | |
| 868 void update_committed_space(HeapWord* old_end, HeapWord* new_end); | |
| 869 | |
| 342 | 870 // The concurrent marker (and the thread it runs in.) |
| 871 ConcurrentMark* _cm; | |
| 872 ConcurrentMarkThread* _cmThread; | |
| 873 bool _mark_in_progress; | |
| 874 | |
| 875 // The concurrent refiner. | |
| 876 ConcurrentG1Refine* _cg1r; | |
| 877 | |
| 878 // The parallel task queues | |
| 879 RefToScanQueueSet *_task_queues; | |
| 880 | |
| 881 // True iff a evacuation has failed in the current collection. | |
| 882 bool _evacuation_failed; | |
| 883 | |
| 10405 | 884 EvacuationFailedInfo* _evacuation_failed_info_array; |
| 342 | 885 |
| 886 // Failed evacuations cause some logical from-space objects to have | |
| 887 // forwarding pointers to themselves. Reset them. | |
| 888 void remove_self_forwarding_pointers(); | |
| 889 | |
|
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890 // Together, these store an object with a preserved mark, and its mark value. |
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891 Stack<oop, mtGC> _objs_with_preserved_marks; |
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892 Stack<markOop, mtGC> _preserved_marks_of_objs; |
| 342 | 893 |
| 894 // Preserve the mark of "obj", if necessary, in preparation for its mark | |
| 895 // word being overwritten with a self-forwarding-pointer. | |
| 896 void preserve_mark_if_necessary(oop obj, markOop m); | |
| 897 | |
| 898 // The stack of evac-failure objects left to be scanned. | |
| 899 GrowableArray<oop>* _evac_failure_scan_stack; | |
| 900 // The closure to apply to evac-failure objects. | |
| 901 | |
| 902 OopsInHeapRegionClosure* _evac_failure_closure; | |
| 903 // Set the field above. | |
| 904 void | |
| 905 set_evac_failure_closure(OopsInHeapRegionClosure* evac_failure_closure) { | |
| 906 _evac_failure_closure = evac_failure_closure; | |
| 907 } | |
| 908 | |
| 909 // Push "obj" on the scan stack. | |
| 910 void push_on_evac_failure_scan_stack(oop obj); | |
| 911 // Process scan stack entries until the stack is empty. | |
| 912 void drain_evac_failure_scan_stack(); | |
| 913 // True iff an invocation of "drain_scan_stack" is in progress; to | |
| 914 // prevent unnecessary recursion. | |
| 915 bool _drain_in_progress; | |
| 916 | |
| 917 // Do any necessary initialization for evacuation-failure handling. | |
| 918 // "cl" is the closure that will be used to process evac-failure | |
| 919 // objects. | |
| 920 void init_for_evac_failure(OopsInHeapRegionClosure* cl); | |
| 921 // Do any necessary cleanup for evacuation-failure handling data | |
| 922 // structures. | |
| 923 void finalize_for_evac_failure(); | |
| 924 | |
| 925 // An attempt to evacuate "obj" has failed; take necessary steps. | |
| 10405 | 926 oop handle_evacuation_failure_par(G1ParScanThreadState* _par_scan_state, oop obj); |
| 342 | 927 void handle_evacuation_failure_common(oop obj, markOop m); |
| 928 | |
|
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929 #ifndef PRODUCT |
|
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930 // Support for forcing evacuation failures. Analogous to |
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931 // PromotionFailureALot for the other collectors. |
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932 |
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933 // Records whether G1EvacuationFailureALot should be in effect |
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934 // for the current GC |
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935 bool _evacuation_failure_alot_for_current_gc; |
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936 |
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937 // Used to record the GC number for interval checking when |
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938 // determining whether G1EvaucationFailureALot is in effect |
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939 // for the current GC. |
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940 size_t _evacuation_failure_alot_gc_number; |
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941 |
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942 // Count of the number of evacuations between failures. |
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943 volatile size_t _evacuation_failure_alot_count; |
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944 |
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945 // Set whether G1EvacuationFailureALot should be in effect |
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946 // for the current GC (based upon the type of GC and which |
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947 // command line flags are set); |
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948 inline bool evacuation_failure_alot_for_gc_type(bool gcs_are_young, |
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949 bool during_initial_mark, |
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950 bool during_marking); |
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951 |
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952 inline void set_evacuation_failure_alot_for_current_gc(); |
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953 |
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954 // Return true if it's time to cause an evacuation failure. |
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955 inline bool evacuation_should_fail(); |
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956 |
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957 // Reset the G1EvacuationFailureALot counters. Should be called at |
| 10405 | 958 // the end of an evacuation pause in which an evacuation failure occurred. |
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959 inline void reset_evacuation_should_fail(); |
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960 #endif // !PRODUCT |
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961 |
|
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962 // ("Weak") Reference processing support. |
|
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963 // |
| 10405 | 964 // G1 has 2 instances of the reference processor class. One |
|
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965 // (_ref_processor_cm) handles reference object discovery |
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966 // and subsequent processing during concurrent marking cycles. |
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967 // |
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968 // The other (_ref_processor_stw) handles reference object |
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969 // discovery and processing during full GCs and incremental |
|
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970 // evacuation pauses. |
|
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971 // |
|
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972 // During an incremental pause, reference discovery will be |
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973 // temporarily disabled for _ref_processor_cm and will be |
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974 // enabled for _ref_processor_stw. At the end of the evacuation |
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975 // pause references discovered by _ref_processor_stw will be |
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976 // processed and discovery will be disabled. The previous |
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977 // setting for reference object discovery for _ref_processor_cm |
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978 // will be re-instated. |
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979 // |
|
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980 // At the start of marking: |
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981 // * Discovery by the CM ref processor is verified to be inactive |
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982 // and it's discovered lists are empty. |
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983 // * Discovery by the CM ref processor is then enabled. |
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984 // |
|
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985 // At the end of marking: |
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986 // * Any references on the CM ref processor's discovered |
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987 // lists are processed (possibly MT). |
|
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988 // |
|
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989 // At the start of full GC we: |
|
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990 // * Disable discovery by the CM ref processor and |
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991 // empty CM ref processor's discovered lists |
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992 // (without processing any entries). |
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993 // * Verify that the STW ref processor is inactive and it's |
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994 // discovered lists are empty. |
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995 // * Temporarily set STW ref processor discovery as single threaded. |
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996 // * Temporarily clear the STW ref processor's _is_alive_non_header |
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997 // field. |
|
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998 // * Finally enable discovery by the STW ref processor. |
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999 // |
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1000 // The STW ref processor is used to record any discovered |
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1001 // references during the full GC. |
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1002 // |
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1003 // At the end of a full GC we: |
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1004 // * Enqueue any reference objects discovered by the STW ref processor |
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1005 // that have non-live referents. This has the side-effect of |
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1006 // making the STW ref processor inactive by disabling discovery. |
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1007 // * Verify that the CM ref processor is still inactive |
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1008 // and no references have been placed on it's discovered |
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1009 // lists (also checked as a precondition during initial marking). |
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1010 |
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1011 // The (stw) reference processor... |
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1012 ReferenceProcessor* _ref_processor_stw; |
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1013 |
| 10405 | 1014 STWGCTimer* _gc_timer_stw; |
| 1015 ConcurrentGCTimer* _gc_timer_cm; | |
| 1016 | |
| 1017 G1OldTracer* _gc_tracer_cm; | |
| 1018 G1NewTracer* _gc_tracer_stw; | |
| 1019 | |
|
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1020 // During reference object discovery, the _is_alive_non_header |
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1021 // closure (if non-null) is applied to the referent object to |
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1022 // determine whether the referent is live. If so then the |
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1023 // reference object does not need to be 'discovered' and can |
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1024 // be treated as a regular oop. This has the benefit of reducing |
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1025 // the number of 'discovered' reference objects that need to |
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1026 // be processed. |
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1027 // |
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1028 // Instance of the is_alive closure for embedding into the |
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1029 // STW reference processor as the _is_alive_non_header field. |
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1030 // Supplying a value for the _is_alive_non_header field is |
|
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1031 // optional but doing so prevents unnecessary additions to |
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1032 // the discovered lists during reference discovery. |
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1033 G1STWIsAliveClosure _is_alive_closure_stw; |
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1034 |
|
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1035 // The (concurrent marking) reference processor... |
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|
1036 ReferenceProcessor* _ref_processor_cm; |
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1037 |
|
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1038 // Instance of the concurrent mark is_alive closure for embedding |
|
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1039 // into the Concurrent Marking reference processor as the |
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1040 // _is_alive_non_header field. Supplying a value for the |
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1041 // _is_alive_non_header field is optional but doing so prevents |
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1042 // unnecessary additions to the discovered lists during reference |
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1043 // discovery. |
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1044 G1CMIsAliveClosure _is_alive_closure_cm; |
| 342 | 1045 |
|
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1046 // Cache used by G1CollectedHeap::start_cset_region_for_worker(). |
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1047 HeapRegion** _worker_cset_start_region; |
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1048 |
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1049 // Time stamp to validate the regions recorded in the cache |
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1050 // used by G1CollectedHeap::start_cset_region_for_worker(). |
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1051 // The heap region entry for a given worker is valid iff |
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1052 // the associated time stamp value matches the current value |
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1053 // of G1CollectedHeap::_gc_time_stamp. |
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1054 unsigned int* _worker_cset_start_region_time_stamp; |
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1055 |
| 342 | 1056 enum G1H_process_strong_roots_tasks { |
|
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1057 G1H_PS_filter_satb_buffers, |
| 342 | 1058 G1H_PS_refProcessor_oops_do, |
| 1059 // Leave this one last. | |
| 1060 G1H_PS_NumElements | |
| 1061 }; | |
| 1062 | |
| 1063 SubTasksDone* _process_strong_tasks; | |
| 1064 | |
| 2152 | 1065 volatile bool _free_regions_coming; |
| 342 | 1066 |
| 1067 public: | |
|
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1068 |
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1069 SubTasksDone* process_strong_tasks() { return _process_strong_tasks; } |
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1070 |
| 342 | 1071 void set_refine_cte_cl_concurrency(bool concurrent); |
| 1072 | |
| 1709 | 1073 RefToScanQueue *task_queue(int i) const; |
| 342 | 1074 |
|
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1075 // A set of cards where updates happened during the GC |
|
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|
1076 DirtyCardQueueSet& dirty_card_queue_set() { return _dirty_card_queue_set; } |
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1077 |
| 1705 | 1078 // A DirtyCardQueueSet that is used to hold cards that contain |
| 1079 // references into the current collection set. This is used to | |
| 1080 // update the remembered sets of the regions in the collection | |
| 1081 // set in the event of an evacuation failure. | |
| 1082 DirtyCardQueueSet& into_cset_dirty_card_queue_set() | |
| 1083 { return _into_cset_dirty_card_queue_set; } | |
| 1084 | |
| 342 | 1085 // Create a G1CollectedHeap with the specified policy. |
| 1086 // Must call the initialize method afterwards. | |
| 1087 // May not return if something goes wrong. | |
| 1088 G1CollectedHeap(G1CollectorPolicy* policy); | |
| 1089 | |
| 1090 // Initialize the G1CollectedHeap to have the initial and | |
|
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1091 // maximum sizes and remembered and barrier sets |
| 342 | 1092 // specified by the policy object. |
| 1093 jint initialize(); | |
| 1094 | |
|
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1095 // Return the (conservative) maximum heap alignment for any G1 heap |
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1096 static size_t conservative_max_heap_alignment(); |
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1097 |
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1098 // Initialize weak reference processing. |
|
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1099 virtual void ref_processing_init(); |
| 342 | 1100 |
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1101 void set_par_threads(uint t) { |
| 342 | 1102 SharedHeap::set_par_threads(t); |
|
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1103 // Done in SharedHeap but oddly there are |
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1104 // two _process_strong_tasks's in a G1CollectedHeap |
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1105 // so do it here too. |
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1106 _process_strong_tasks->set_n_threads(t); |
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1107 } |
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1108 |
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1109 // Set _n_par_threads according to a policy TBD. |
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1110 void set_par_threads(); |
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1111 |
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1112 void set_n_termination(int t) { |
|
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1113 _process_strong_tasks->set_n_threads(t); |
| 342 | 1114 } |
| 1115 | |
| 1116 virtual CollectedHeap::Name kind() const { | |
| 1117 return CollectedHeap::G1CollectedHeap; | |
| 1118 } | |
| 1119 | |
| 1120 // The current policy object for the collector. | |
| 1121 G1CollectorPolicy* g1_policy() const { return _g1_policy; } | |
| 1122 | |
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1123 virtual CollectorPolicy* collector_policy() const { return (CollectorPolicy*) g1_policy(); } |
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1124 |
| 342 | 1125 // Adaptive size policy. No such thing for g1. |
| 1126 virtual AdaptiveSizePolicy* size_policy() { return NULL; } | |
| 1127 | |
| 1128 // The rem set and barrier set. | |
| 1129 G1RemSet* g1_rem_set() const { return _g1_rem_set; } | |
| 1130 ModRefBarrierSet* mr_bs() const { return _mr_bs; } | |
| 1131 | |
| 1132 unsigned get_gc_time_stamp() { | |
| 1133 return _gc_time_stamp; | |
| 1134 } | |
| 1135 | |
| 1136 void reset_gc_time_stamp() { | |
| 1137 _gc_time_stamp = 0; | |
|
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1138 OrderAccess::fence(); |
|
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1139 // Clear the cached CSet starting regions and time stamps. |
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1140 // Their validity is dependent on the GC timestamp. |
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1141 clear_cset_start_regions(); |
|
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1142 } |
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1143 |
|
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1144 void check_gc_time_stamps() PRODUCT_RETURN; |
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1145 |
|
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1146 void increment_gc_time_stamp() { |
|
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1147 ++_gc_time_stamp; |
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1148 OrderAccess::fence(); |
| 342 | 1149 } |
| 1150 | |
|
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1151 // Reset the given region's GC timestamp. If it's starts humongous, |
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1152 // also reset the GC timestamp of its corresponding |
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1153 // continues humongous regions too. |
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1154 void reset_gc_time_stamps(HeapRegion* hr); |
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1155 |
| 1705 | 1156 void iterate_dirty_card_closure(CardTableEntryClosure* cl, |
| 1157 DirtyCardQueue* into_cset_dcq, | |
| 1158 bool concurrent, int worker_i); | |
| 342 | 1159 |
| 1160 // The shared block offset table array. | |
| 1161 G1BlockOffsetSharedArray* bot_shared() const { return _bot_shared; } | |
| 1162 | |
|
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1163 // Reference Processing accessors |
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1164 |
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1165 // The STW reference processor.... |
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1166 ReferenceProcessor* ref_processor_stw() const { return _ref_processor_stw; } |
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1167 |
| 10405 | 1168 // The Concurrent Marking reference processor... |
|
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1169 ReferenceProcessor* ref_processor_cm() const { return _ref_processor_cm; } |
| 342 | 1170 |
| 10405 | 1171 ConcurrentGCTimer* gc_timer_cm() const { return _gc_timer_cm; } |
| 1172 G1OldTracer* gc_tracer_cm() const { return _gc_tracer_cm; } | |
| 1173 | |
| 342 | 1174 virtual size_t capacity() const; |
| 1175 virtual size_t used() const; | |
|
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1176 // This should be called when we're not holding the heap lock. The |
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1177 // result might be a bit inaccurate. |
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1178 size_t used_unlocked() const; |
| 342 | 1179 size_t recalculate_used() const; |
| 1180 | |
| 1181 // These virtual functions do the actual allocation. | |
| 1182 // Some heaps may offer a contiguous region for shared non-blocking | |
| 1183 // allocation, via inlined code (by exporting the address of the top and | |
| 1184 // end fields defining the extent of the contiguous allocation region.) | |
| 1185 // But G1CollectedHeap doesn't yet support this. | |
| 1186 | |
| 1187 // Return an estimate of the maximum allocation that could be performed | |
| 1188 // without triggering any collection or expansion activity. In a | |
| 1189 // generational collector, for example, this is probably the largest | |
| 1190 // allocation that could be supported (without expansion) in the youngest | |
| 1191 // generation. It is "unsafe" because no locks are taken; the result | |
| 1192 // should be treated as an approximation, not a guarantee, for use in | |
| 1193 // heuristic resizing decisions. | |
| 1194 virtual size_t unsafe_max_alloc(); | |
| 1195 | |
| 1196 virtual bool is_maximal_no_gc() const { | |
| 1197 return _g1_storage.uncommitted_size() == 0; | |
| 1198 } | |
| 1199 | |
| 1200 // The total number of regions in the heap. | |
|
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1201 uint n_regions() { return _hrs.length(); } |
| 3766 | 1202 |
| 1203 // The max number of regions in the heap. | |
|
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1204 uint max_regions() { return _hrs.max_length(); } |
| 342 | 1205 |
| 1206 // The number of regions that are completely free. | |
|
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1207 uint free_regions() { return _free_list.length(); } |
| 342 | 1208 |
| 1209 // The number of regions that are not completely free. | |
|
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1210 uint used_regions() { return n_regions() - free_regions(); } |
| 342 | 1211 |
| 1212 // The number of regions available for "regular" expansion. | |
|
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1213 uint expansion_regions() { return _expansion_regions; } |
| 342 | 1214 |
| 3766 | 1215 // Factory method for HeapRegion instances. It will return NULL if |
| 1216 // the allocation fails. | |
|
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1217 HeapRegion* new_heap_region(uint hrs_index, HeapWord* bottom); |
| 3766 | 1218 |
|
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1219 void verify_not_dirty_region(HeapRegion* hr) PRODUCT_RETURN; |
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1220 void verify_dirty_region(HeapRegion* hr) PRODUCT_RETURN; |
|
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1221 void verify_dirty_young_list(HeapRegion* head) PRODUCT_RETURN; |
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1222 void verify_dirty_young_regions() PRODUCT_RETURN; |
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1223 |
| 2152 | 1224 // verify_region_sets() performs verification over the region |
| 1225 // lists. It will be compiled in the product code to be used when | |
| 1226 // necessary (i.e., during heap verification). | |
| 1227 void verify_region_sets(); | |
| 342 | 1228 |
| 2152 | 1229 // verify_region_sets_optional() is planted in the code for |
| 1230 // list verification in non-product builds (and it can be enabled in | |
| 10405 | 1231 // product builds by defining HEAP_REGION_SET_FORCE_VERIFY to be 1). |
| 2152 | 1232 #if HEAP_REGION_SET_FORCE_VERIFY |
| 1233 void verify_region_sets_optional() { | |
| 1234 verify_region_sets(); | |
| 1235 } | |
| 1236 #else // HEAP_REGION_SET_FORCE_VERIFY | |
| 1237 void verify_region_sets_optional() { } | |
| 1238 #endif // HEAP_REGION_SET_FORCE_VERIFY | |
| 342 | 1239 |
| 2152 | 1240 #ifdef ASSERT |
| 2361 | 1241 bool is_on_master_free_list(HeapRegion* hr) { |
| 2152 | 1242 return hr->containing_set() == &_free_list; |
| 1243 } | |
| 342 | 1244 |
| 2361 | 1245 bool is_in_humongous_set(HeapRegion* hr) { |
| 2152 | 1246 return hr->containing_set() == &_humongous_set; |
| 2361 | 1247 } |
| 2152 | 1248 #endif // ASSERT |
| 342 | 1249 |
| 2152 | 1250 // Wrapper for the region list operations that can be called from |
| 1251 // methods outside this class. | |
| 342 | 1252 |
| 2152 | 1253 void secondary_free_list_add_as_tail(FreeRegionList* list) { |
| 1254 _secondary_free_list.add_as_tail(list); | |
| 1255 } | |
| 342 | 1256 |
| 2152 | 1257 void append_secondary_free_list() { |
|
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1258 _free_list.add_as_head(&_secondary_free_list); |
| 2152 | 1259 } |
| 342 | 1260 |
| 2361 | 1261 void append_secondary_free_list_if_not_empty_with_lock() { |
| 1262 // If the secondary free list looks empty there's no reason to | |
| 1263 // take the lock and then try to append it. | |
| 2152 | 1264 if (!_secondary_free_list.is_empty()) { |
| 1265 MutexLockerEx x(SecondaryFreeList_lock, Mutex::_no_safepoint_check_flag); | |
| 1266 append_secondary_free_list(); | |
| 1267 } | |
| 1268 } | |
| 342 | 1269 |
| 4072 | 1270 void old_set_remove(HeapRegion* hr) { |
| 1271 _old_set.remove(hr); | |
| 1272 } | |
| 1273 | |
|
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1274 size_t non_young_capacity_bytes() { |
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1275 return _old_set.total_capacity_bytes() + _humongous_set.total_capacity_bytes(); |
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1276 } |
|
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1277 |
| 2152 | 1278 void set_free_regions_coming(); |
| 1279 void reset_free_regions_coming(); | |
| 1280 bool free_regions_coming() { return _free_regions_coming; } | |
| 1281 void wait_while_free_regions_coming(); | |
| 342 | 1282 |
|
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1283 // Determine whether the given region is one that we are using as an |
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1284 // old GC alloc region. |
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1285 bool is_old_gc_alloc_region(HeapRegion* hr) { |
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1286 return hr == _retained_old_gc_alloc_region; |
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1287 } |
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1288 |
| 342 | 1289 // Perform a collection of the heap; intended for use in implementing |
| 1290 // "System.gc". This probably implies as full a collection as the | |
| 1291 // "CollectedHeap" supports. | |
| 1292 virtual void collect(GCCause::Cause cause); | |
| 1293 | |
| 1294 // The same as above but assume that the caller holds the Heap_lock. | |
| 1295 void collect_locked(GCCause::Cause cause); | |
| 1296 | |
| 10405 | 1297 // True iff an evacuation has failed in the most-recent collection. |
| 342 | 1298 bool evacuation_failed() { return _evacuation_failed; } |
| 1299 | |
| 2152 | 1300 // It will free a region if it has allocated objects in it that are |
| 1301 // all dead. It calls either free_region() or | |
| 1302 // free_humongous_region() depending on the type of the region that | |
| 1303 // is passed to it. | |
| 2173 | 1304 void free_region_if_empty(HeapRegion* hr, |
| 1305 size_t* pre_used, | |
| 1306 FreeRegionList* free_list, | |
| 4072 | 1307 OldRegionSet* old_proxy_set, |
| 2173 | 1308 HumongousRegionSet* humongous_proxy_set, |
| 1309 HRRSCleanupTask* hrrs_cleanup_task, | |
| 1310 bool par); | |
| 342 | 1311 |
| 2152 | 1312 // It appends the free list to the master free list and updates the |
| 1313 // master humongous list according to the contents of the proxy | |
| 1314 // list. It also adjusts the total used bytes according to pre_used | |
| 1315 // (if par is true, it will do so by taking the ParGCRareEvent_lock). | |
| 1316 void update_sets_after_freeing_regions(size_t pre_used, | |
| 1317 FreeRegionList* free_list, | |
| 4072 | 1318 OldRegionSet* old_proxy_set, |
| 2152 | 1319 HumongousRegionSet* humongous_proxy_set, |
| 1320 bool par); | |
| 342 | 1321 |
| 4708 | 1322 // Returns "TRUE" iff "p" points into the committed areas of the heap. |
| 342 | 1323 virtual bool is_in(const void* p) const; |
| 1324 | |
| 1325 // Return "TRUE" iff the given object address is within the collection | |
| 1326 // set. | |
| 1327 inline bool obj_in_cs(oop obj); | |
| 1328 | |
| 1329 // Return "TRUE" iff the given object address is in the reserved | |
|
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1330 // region of g1. |
| 342 | 1331 bool is_in_g1_reserved(const void* p) const { |
| 1332 return _g1_reserved.contains(p); | |
| 1333 } | |
| 1334 | |
|
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1335 // Returns a MemRegion that corresponds to the space that has been |
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1336 // reserved for the heap |
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1337 MemRegion g1_reserved() { |
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1338 return _g1_reserved; |
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1339 } |
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1340 |
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1341 // Returns a MemRegion that corresponds to the space that has been |
| 342 | 1342 // committed in the heap |
| 1343 MemRegion g1_committed() { | |
| 1344 return _g1_committed; | |
| 1345 } | |
| 1346 | |
| 2311 | 1347 virtual bool is_in_closed_subset(const void* p) const; |
| 342 | 1348 |
| 1349 // This resets the card table to all zeros. It is used after | |
| 1350 // a collection pause which used the card table to claim cards. | |
| 1351 void cleanUpCardTable(); | |
| 1352 | |
| 1353 // Iteration functions. | |
| 1354 | |
| 1355 // Iterate over all the ref-containing fields of all objects, calling | |
| 1356 // "cl.do_oop" on each. | |
|
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1357 virtual void oop_iterate(ExtendedOopClosure* cl); |
| 342 | 1358 |
| 1359 // Same as above, restricted to a memory region. | |
|
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1360 void oop_iterate(MemRegion mr, ExtendedOopClosure* cl); |
| 342 | 1361 |
| 1362 // Iterate over all objects, calling "cl.do_object" on each. | |
|
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1363 virtual void object_iterate(ObjectClosure* cl); |
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1364 |
| 678 | 1365 virtual void safe_object_iterate(ObjectClosure* cl) { |
|
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1366 object_iterate(cl); |
| 678 | 1367 } |
| 342 | 1368 |
| 1369 // Iterate over all spaces in use in the heap, in ascending address order. | |
| 1370 virtual void space_iterate(SpaceClosure* cl); | |
| 1371 | |
| 1372 // Iterate over heap regions, in address order, terminating the | |
| 1373 // iteration early if the "doHeapRegion" method returns "true". | |
| 3766 | 1374 void heap_region_iterate(HeapRegionClosure* blk) const; |
| 342 | 1375 |
| 3766 | 1376 // Return the region with the given index. It assumes the index is valid. |
|
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1377 HeapRegion* region_at(uint index) const { return _hrs.at(index); } |
| 342 | 1378 |
| 1379 // Divide the heap region sequence into "chunks" of some size (the number | |
| 1380 // of regions divided by the number of parallel threads times some | |
| 1381 // overpartition factor, currently 4). Assumes that this will be called | |
| 1382 // in parallel by ParallelGCThreads worker threads with discinct worker | |
| 1383 // ids in the range [0..max(ParallelGCThreads-1, 1)], that all parallel | |
| 1384 // calls will use the same "claim_value", and that that claim value is | |
| 1385 // different from the claim_value of any heap region before the start of | |
| 1386 // the iteration. Applies "blk->doHeapRegion" to each of the regions, by | |
| 1387 // attempting to claim the first region in each chunk, and, if | |
| 1388 // successful, applying the closure to each region in the chunk (and | |
| 1389 // setting the claim value of the second and subsequent regions of the | |
| 1390 // chunk.) For now requires that "doHeapRegion" always returns "false", | |
| 1391 // i.e., that a closure never attempt to abort a traversal. | |
| 1392 void heap_region_par_iterate_chunked(HeapRegionClosure* blk, | |
|
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1393 uint worker, |
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1394 uint no_of_par_workers, |
| 342 | 1395 jint claim_value); |
| 1396 | |
| 390 | 1397 // It resets all the region claim values to the default. |
| 1398 void reset_heap_region_claim_values(); | |
| 1399 | |
|
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1400 // Resets the claim values of regions in the current |
|
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1401 // collection set to the default. |
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1402 void reset_cset_heap_region_claim_values(); |
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1403 |
| 355 | 1404 #ifdef ASSERT |
| 1405 bool check_heap_region_claim_values(jint claim_value); | |
|
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1406 |
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1407 // Same as the routine above but only checks regions in the |
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1408 // current collection set. |
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1409 bool check_cset_heap_region_claim_values(jint claim_value); |
| 355 | 1410 #endif // ASSERT |
| 1411 | |
|
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1412 // Clear the cached cset start regions and (more importantly) |
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1413 // the time stamps. Called when we reset the GC time stamp. |
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1414 void clear_cset_start_regions(); |
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1415 |
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1416 // Given the id of a worker, obtain or calculate a suitable |
|
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1417 // starting region for iterating over the current collection set. |
|
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1418 HeapRegion* start_cset_region_for_worker(int worker_i); |
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1419 |
|
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1420 // This is a convenience method that is used by the |
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1421 // HeapRegionIterator classes to calculate the starting region for |
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1422 // each worker so that they do not all start from the same region. |
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1423 HeapRegion* start_region_for_worker(uint worker_i, uint no_of_par_workers); |
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1424 |
| 342 | 1425 // Iterate over the regions (if any) in the current collection set. |
| 1426 void collection_set_iterate(HeapRegionClosure* blk); | |
| 1427 | |
| 1428 // As above but starting from region r | |
| 1429 void collection_set_iterate_from(HeapRegion* r, HeapRegionClosure *blk); | |
| 1430 | |
| 1431 // Returns the first (lowest address) compactible space in the heap. | |
| 1432 virtual CompactibleSpace* first_compactible_space(); | |
| 1433 | |
| 1434 // A CollectedHeap will contain some number of spaces. This finds the | |
| 1435 // space containing a given address, or else returns NULL. | |
| 1436 virtual Space* space_containing(const void* addr) const; | |
| 1437 | |
| 1438 // A G1CollectedHeap will contain some number of heap regions. This | |
| 1439 // finds the region containing a given address, or else returns NULL. | |
| 3766 | 1440 template <class T> |
| 1441 inline HeapRegion* heap_region_containing(const T addr) const; | |
| 342 | 1442 |
| 1443 // Like the above, but requires "addr" to be in the heap (to avoid a | |
| 1444 // null-check), and unlike the above, may return an continuing humongous | |
| 1445 // region. | |
| 3766 | 1446 template <class T> |
| 1447 inline HeapRegion* heap_region_containing_raw(const T addr) const; | |
| 342 | 1448 |
| 1449 // A CollectedHeap is divided into a dense sequence of "blocks"; that is, | |
| 1450 // each address in the (reserved) heap is a member of exactly | |
| 1451 // one block. The defining characteristic of a block is that it is | |
| 1452 // possible to find its size, and thus to progress forward to the next | |
| 1453 // block. (Blocks may be of different sizes.) Thus, blocks may | |
| 1454 // represent Java objects, or they might be free blocks in a | |
| 1455 // free-list-based heap (or subheap), as long as the two kinds are | |
| 1456 // distinguishable and the size of each is determinable. | |
| 1457 | |
| 1458 // Returns the address of the start of the "block" that contains the | |
| 1459 // address "addr". We say "blocks" instead of "object" since some heaps | |
| 1460 // may not pack objects densely; a chunk may either be an object or a | |
| 1461 // non-object. | |
| 1462 virtual HeapWord* block_start(const void* addr) const; | |
| 1463 | |
| 1464 // Requires "addr" to be the start of a chunk, and returns its size. | |
| 1465 // "addr + size" is required to be the start of a new chunk, or the end | |
| 1466 // of the active area of the heap. | |
| 1467 virtual size_t block_size(const HeapWord* addr) const; | |
| 1468 | |
| 1469 // Requires "addr" to be the start of a block, and returns "TRUE" iff | |
| 1470 // the block is an object. | |
| 1471 virtual bool block_is_obj(const HeapWord* addr) const; | |
| 1472 | |
| 1473 // Does this heap support heap inspection? (+PrintClassHistogram) | |
| 1474 virtual bool supports_heap_inspection() const { return true; } | |
| 1475 | |
| 1476 // Section on thread-local allocation buffers (TLABs) | |
| 1477 // See CollectedHeap for semantics. | |
| 1478 | |
| 1479 virtual bool supports_tlab_allocation() const; | |
| 1480 virtual size_t tlab_capacity(Thread* thr) const; | |
| 1481 virtual size_t unsafe_max_tlab_alloc(Thread* thr) const; | |
| 1482 | |
| 1483 // Can a compiler initialize a new object without store barriers? | |
| 1484 // This permission only extends from the creation of a new object | |
|
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1485 // via a TLAB up to the first subsequent safepoint. If such permission |
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1486 // is granted for this heap type, the compiler promises to call |
|
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1487 // defer_store_barrier() below on any slow path allocation of |
|
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1488 // a new object for which such initializing store barriers will |
|
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1489 // have been elided. G1, like CMS, allows this, but should be |
|
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1490 // ready to provide a compensating write barrier as necessary |
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1491 // if that storage came out of a non-young region. The efficiency |
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1492 // of this implementation depends crucially on being able to |
|
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1493 // answer very efficiently in constant time whether a piece of |
|
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1494 // storage in the heap comes from a young region or not. |
|
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|
1495 // See ReduceInitialCardMarks. |
| 342 | 1496 virtual bool can_elide_tlab_store_barriers() const { |
|
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1497 return true; |
|
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|
1498 } |
|
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|
1499 |
| 1166 | 1500 virtual bool card_mark_must_follow_store() const { |
| 1501 return true; | |
| 1502 } | |
| 1503 | |
| 3766 | 1504 bool is_in_young(const oop obj) { |
|
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1505 HeapRegion* hr = heap_region_containing(obj); |
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1506 return hr != NULL && hr->is_young(); |
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1507 } |
|
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|
1508 |
|
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1509 #ifdef ASSERT |
|
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1510 virtual bool is_in_partial_collection(const void* p); |
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1511 #endif |
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1512 |
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1513 virtual bool is_scavengable(const void* addr); |
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1514 |
|
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1515 // We don't need barriers for initializing stores to objects |
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1516 // in the young gen: for the SATB pre-barrier, there is no |
|
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|
1517 // pre-value that needs to be remembered; for the remembered-set |
|
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|
1518 // update logging post-barrier, we don't maintain remembered set |
|
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1519 // information for young gen objects. |
|
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1520 virtual bool can_elide_initializing_store_barrier(oop new_obj) { |
|
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1521 return is_in_young(new_obj); |
| 342 | 1522 } |
| 1523 | |
| 1524 // Returns "true" iff the given word_size is "very large". | |
| 1525 static bool isHumongous(size_t word_size) { | |
|
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1526 // Note this has to be strictly greater-than as the TLABs |
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1527 // are capped at the humongous thresold and we want to |
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1528 // ensure that we don't try to allocate a TLAB as |
|
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1529 // humongous and that we don't allocate a humongous |
|
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1530 // object in a TLAB. |
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1531 return word_size > _humongous_object_threshold_in_words; |
| 342 | 1532 } |
| 1533 | |
| 1534 // Update mod union table with the set of dirty cards. | |
| 1535 void updateModUnion(); | |
| 1536 | |
| 1537 // Set the mod union bits corresponding to the given memRegion. Note | |
| 1538 // that this is always a safe operation, since it doesn't clear any | |
| 1539 // bits. | |
| 1540 void markModUnionRange(MemRegion mr); | |
| 1541 | |
| 1542 // Records the fact that a marking phase is no longer in progress. | |
| 1543 void set_marking_complete() { | |
| 1544 _mark_in_progress = false; | |
| 1545 } | |
| 1546 void set_marking_started() { | |
| 1547 _mark_in_progress = true; | |
| 1548 } | |
| 1549 bool mark_in_progress() { | |
| 1550 return _mark_in_progress; | |
| 1551 } | |
| 1552 | |
| 1553 // Print the maximum heap capacity. | |
| 1554 virtual size_t max_capacity() const; | |
| 1555 | |
| 1556 virtual jlong millis_since_last_gc(); | |
| 1557 | |
|
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1558 |
| 342 | 1559 // Convenience function to be used in situations where the heap type can be |
| 1560 // asserted to be this type. | |
| 1561 static G1CollectedHeap* heap(); | |
| 1562 | |
| 1563 void set_region_short_lived_locked(HeapRegion* hr); | |
| 1564 // add appropriate methods for any other surv rate groups | |
| 1565 | |
|
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1566 YoungList* young_list() { return _young_list; } |
| 342 | 1567 |
| 1568 // debugging | |
| 1569 bool check_young_list_well_formed() { | |
| 1570 return _young_list->check_list_well_formed(); | |
| 1571 } | |
|
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1572 |
|
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1573 bool check_young_list_empty(bool check_heap, |
| 342 | 1574 bool check_sample = true); |
| 1575 | |
| 1576 // *** Stuff related to concurrent marking. It's not clear to me that so | |
| 1577 // many of these need to be public. | |
| 1578 | |
| 1579 // The functions below are helper functions that a subclass of | |
| 1580 // "CollectedHeap" can use in the implementation of its virtual | |
| 1581 // functions. | |
| 1582 // This performs a concurrent marking of the live objects in a | |
| 1583 // bitmap off to the side. | |
| 1584 void doConcurrentMark(); | |
| 1585 | |
| 1586 bool isMarkedPrev(oop obj) const; | |
| 1587 bool isMarkedNext(oop obj) const; | |
| 1588 | |
| 1589 // Determine if an object is dead, given the object and also | |
| 1590 // the region to which the object belongs. An object is dead | |
| 1591 // iff a) it was not allocated since the last mark and b) it | |
| 1592 // is not marked. | |
| 1593 | |
| 1594 bool is_obj_dead(const oop obj, const HeapRegion* hr) const { | |
| 1595 return | |
| 1596 !hr->obj_allocated_since_prev_marking(obj) && | |
| 1597 !isMarkedPrev(obj); | |
| 1598 } | |
| 1599 | |
| 1600 // This function returns true when an object has been | |
| 1601 // around since the previous marking and hasn't yet | |
| 1602 // been marked during this marking. | |
| 1603 | |
| 1604 bool is_obj_ill(const oop obj, const HeapRegion* hr) const { | |
| 1605 return | |
| 1606 !hr->obj_allocated_since_next_marking(obj) && | |
| 1607 !isMarkedNext(obj); | |
| 1608 } | |
| 1609 | |
| 1610 // Determine if an object is dead, given only the object itself. | |
| 1611 // This will find the region to which the object belongs and | |
| 1612 // then call the region version of the same function. | |
| 1613 | |
| 1614 // Added if it is NULL it isn't dead. | |
| 1615 | |
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1616 bool is_obj_dead(const oop obj) const { |
| 811 | 1617 const HeapRegion* hr = heap_region_containing(obj); |
| 342 | 1618 if (hr == NULL) { |
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1619 if (obj == NULL) return false; |
| 342 | 1620 else return true; |
| 1621 } | |
| 1622 else return is_obj_dead(obj, hr); | |
| 1623 } | |
| 1624 | |
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1625 bool is_obj_ill(const oop obj) const { |
| 811 | 1626 const HeapRegion* hr = heap_region_containing(obj); |
| 342 | 1627 if (hr == NULL) { |
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1628 if (obj == NULL) return false; |
| 342 | 1629 else return true; |
| 1630 } | |
| 1631 else return is_obj_ill(obj, hr); | |
| 1632 } | |
| 1633 | |
| 12080 | 1634 bool allocated_since_marking(oop obj, HeapRegion* hr, VerifyOption vo); |
| 1635 HeapWord* top_at_mark_start(HeapRegion* hr, VerifyOption vo); | |
| 1636 bool is_marked(oop obj, VerifyOption vo); | |
| 1637 const char* top_at_mark_start_str(VerifyOption vo); | |
| 1638 | |
| 1639 ConcurrentMark* concurrent_mark() const { return _cm; } | |
| 1640 | |
| 1641 // Refinement | |
| 1642 | |
| 1643 ConcurrentG1Refine* concurrent_g1_refine() const { return _cg1r; } | |
| 1644 | |
| 1645 // The dirty cards region list is used to record a subset of regions | |
| 1646 // whose cards need clearing. The list if populated during the | |
| 1647 // remembered set scanning and drained during the card table | |
| 1648 // cleanup. Although the methods are reentrant, population/draining | |
| 1649 // phases must not overlap. For synchronization purposes the last | |
| 1650 // element on the list points to itself. | |
| 1651 HeapRegion* _dirty_cards_region_list; | |
| 1652 void push_dirty_cards_region(HeapRegion* hr); | |
| 1653 HeapRegion* pop_dirty_cards_region(); | |
| 1654 | |
| 1655 // Optimized nmethod scanning support routines | |
| 1656 | |
| 1657 // Register the given nmethod with the G1 heap | |
| 1658 virtual void register_nmethod(nmethod* nm); | |
| 1659 | |
| 1660 // Unregister the given nmethod from the G1 heap | |
| 1661 virtual void unregister_nmethod(nmethod* nm); | |
| 1662 | |
| 1663 // Migrate the nmethods in the code root lists of the regions | |
| 1664 // in the collection set to regions in to-space. In the event | |
| 1665 // of an evacuation failure, nmethods that reference objects | |
| 1666 // that were not successfullly evacuated are not migrated. | |
| 1667 void migrate_strong_code_roots(); | |
| 1668 | |
| 1669 // During an initial mark pause, mark all the code roots that | |
| 1670 // point into regions *not* in the collection set. | |
| 1671 void mark_strong_code_roots(uint worker_id); | |
| 1672 | |
| 1673 // Rebuild the stong code root lists for each region | |
| 1674 // after a full GC | |
| 1675 void rebuild_strong_code_roots(); | |
| 1676 | |
| 1677 // Verification | |
| 1678 | |
| 1679 // The following is just to alert the verification code | |
| 1680 // that a full collection has occurred and that the | |
| 1681 // remembered sets are no longer up to date. | |
| 1682 bool _full_collection; | |
| 1683 void set_full_collection() { _full_collection = true;} | |
| 1684 void clear_full_collection() {_full_collection = false;} | |
| 1685 bool full_collection() {return _full_collection;} | |
| 1686 | |
| 1687 // Perform any cleanup actions necessary before allowing a verification. | |
| 1688 virtual void prepare_for_verify(); | |
| 1689 | |
| 1690 // Perform verification. | |
| 1691 | |
| 1692 // vo == UsePrevMarking -> use "prev" marking information, | |
| 1693 // vo == UseNextMarking -> use "next" marking information | |
| 1694 // vo == UseMarkWord -> use the mark word in the object header | |
| 1695 // | |
| 1696 // NOTE: Only the "prev" marking information is guaranteed to be | |
| 1697 // consistent most of the time, so most calls to this should use | |
| 1698 // vo == UsePrevMarking. | |
| 1699 // Currently, there is only one case where this is called with | |
| 1700 // vo == UseNextMarking, which is to verify the "next" marking | |
| 1701 // information at the end of remark. | |
| 1702 // Currently there is only one place where this is called with | |
| 1703 // vo == UseMarkWord, which is to verify the marking during a | |
| 1704 // full GC. | |
| 1705 void verify(bool silent, VerifyOption vo); | |
| 1706 | |
| 1707 // Override; it uses the "prev" marking information | |
| 1708 virtual void verify(bool silent); | |
| 1709 | |
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1710 // The methods below are here for convenience and dispatch the |
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1711 // appropriate method depending on value of the given VerifyOption |
| 12080 | 1712 // parameter. The values for that parameter, and their meanings, |
| 1713 // are the same as those above. | |
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1714 |
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1715 bool is_obj_dead_cond(const oop obj, |
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1716 const HeapRegion* hr, |
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1717 const VerifyOption vo) const { |
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1718 switch (vo) { |
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1719 case VerifyOption_G1UsePrevMarking: return is_obj_dead(obj, hr); |
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1720 case VerifyOption_G1UseNextMarking: return is_obj_ill(obj, hr); |
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1721 case VerifyOption_G1UseMarkWord: return !obj->is_gc_marked(); |
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1722 default: ShouldNotReachHere(); |
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1723 } |
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1724 return false; // keep some compilers happy |
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1725 } |
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1726 |
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1727 bool is_obj_dead_cond(const oop obj, |
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1728 const VerifyOption vo) const { |
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1729 switch (vo) { |
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1730 case VerifyOption_G1UsePrevMarking: return is_obj_dead(obj); |
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1731 case VerifyOption_G1UseNextMarking: return is_obj_ill(obj); |
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1732 case VerifyOption_G1UseMarkWord: return !obj->is_gc_marked(); |
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1733 default: ShouldNotReachHere(); |
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1734 } |
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1735 return false; // keep some compilers happy |
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1736 } |
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1737 |
| 12080 | 1738 // Printing |
|
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1739 |
| 12080 | 1740 virtual void print_on(outputStream* st) const; |
| 1741 virtual void print_extended_on(outputStream* st) const; | |
| 1742 virtual void print_on_error(outputStream* st) const; | |
| 342 | 1743 |
| 12080 | 1744 virtual void print_gc_threads_on(outputStream* st) const; |
| 1745 virtual void gc_threads_do(ThreadClosure* tc) const; | |
| 342 | 1746 |
| 12080 | 1747 // Override |
| 1748 void print_tracing_info() const; | |
| 1749 | |
| 1750 // The following two methods are helpful for debugging RSet issues. | |
| 1751 void print_cset_rsets() PRODUCT_RETURN; | |
| 1752 void print_all_rsets() PRODUCT_RETURN; | |
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1753 |
| 342 | 1754 public: |
| 1755 void stop_conc_gc_threads(); | |
| 1756 | |
| 1757 size_t pending_card_num(); | |
| 1758 size_t cards_scanned(); | |
| 1759 | |
| 1760 protected: | |
| 1761 size_t _max_heap_capacity; | |
| 1762 }; | |
| 1763 | |
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1764 class G1ParGCAllocBuffer: public ParGCAllocBuffer { |
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1765 private: |
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1766 bool _retired; |
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1767 |
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1768 public: |
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1769 G1ParGCAllocBuffer(size_t gclab_word_size); |
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1770 |
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1771 void set_buf(HeapWord* buf) { |
|
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1772 ParGCAllocBuffer::set_buf(buf); |
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1773 _retired = false; |
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1774 } |
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1775 |
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1776 void retire(bool end_of_gc, bool retain) { |
|
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1777 if (_retired) |
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|
1778 return; |
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1779 ParGCAllocBuffer::retire(end_of_gc, retain); |
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1780 _retired = true; |
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|
1781 } |
|
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1782 |
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1783 bool is_retired() { |
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1784 return _retired; |
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1785 } |
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1786 }; |
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1787 |
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1788 class G1ParGCAllocBufferContainer { |
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1789 protected: |
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1790 static int const _priority_max = 2; |
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1791 G1ParGCAllocBuffer* _priority_buffer[_priority_max]; |
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1792 |
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1793 public: |
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1794 G1ParGCAllocBufferContainer(size_t gclab_word_size) { |
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1795 for (int pr = 0; pr < _priority_max; ++pr) { |
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1796 _priority_buffer[pr] = new G1ParGCAllocBuffer(gclab_word_size); |
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1797 } |
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1798 } |
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1799 |
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1800 ~G1ParGCAllocBufferContainer() { |
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1801 for (int pr = 0; pr < _priority_max; ++pr) { |
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1802 assert(_priority_buffer[pr]->is_retired(), "alloc buffers should all retire at this point."); |
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1803 delete _priority_buffer[pr]; |
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1804 } |
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1805 } |
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1806 |
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1807 HeapWord* allocate(size_t word_sz) { |
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1808 HeapWord* obj; |
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1809 for (int pr = 0; pr < _priority_max; ++pr) { |
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1810 obj = _priority_buffer[pr]->allocate(word_sz); |
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1811 if (obj != NULL) return obj; |
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1812 } |
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1813 return obj; |
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1814 } |
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1815 |
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1816 bool contains(void* addr) { |
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1817 for (int pr = 0; pr < _priority_max; ++pr) { |
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1818 if (_priority_buffer[pr]->contains(addr)) return true; |
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1819 } |
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1820 return false; |
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1821 } |
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1822 |
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1823 void undo_allocation(HeapWord* obj, size_t word_sz) { |
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1824 bool finish_undo; |
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1825 for (int pr = 0; pr < _priority_max; ++pr) { |
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1826 if (_priority_buffer[pr]->contains(obj)) { |
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1827 _priority_buffer[pr]->undo_allocation(obj, word_sz); |
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1828 finish_undo = true; |
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1829 } |
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1830 } |
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1831 if (!finish_undo) ShouldNotReachHere(); |
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1832 } |
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1833 |
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1834 size_t words_remaining() { |
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1835 size_t result = 0; |
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1836 for (int pr = 0; pr < _priority_max; ++pr) { |
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1837 result += _priority_buffer[pr]->words_remaining(); |
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1838 } |
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1839 return result; |
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1840 } |
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1841 |
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1842 size_t words_remaining_in_retired_buffer() { |
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1843 G1ParGCAllocBuffer* retired = _priority_buffer[0]; |
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1844 return retired->words_remaining(); |
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1845 } |
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1846 |
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1847 void flush_stats_and_retire(PLABStats* stats, bool end_of_gc, bool retain) { |
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1848 for (int pr = 0; pr < _priority_max; ++pr) { |
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1849 _priority_buffer[pr]->flush_stats_and_retire(stats, end_of_gc, retain); |
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1850 } |
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1851 } |
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1852 |
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1853 void update(bool end_of_gc, bool retain, HeapWord* buf, size_t word_sz) { |
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1854 G1ParGCAllocBuffer* retired_and_set = _priority_buffer[0]; |
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1855 retired_and_set->retire(end_of_gc, retain); |
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1856 retired_and_set->set_buf(buf); |
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1857 retired_and_set->set_word_size(word_sz); |
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1858 adjust_priority_order(); |
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1859 } |
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1860 |
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1861 private: |
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1862 void adjust_priority_order() { |
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1863 G1ParGCAllocBuffer* retired_and_set = _priority_buffer[0]; |
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1864 |
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1865 int last = _priority_max - 1; |
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1866 for (int pr = 0; pr < last; ++pr) { |
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1867 _priority_buffer[pr] = _priority_buffer[pr + 1]; |
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1868 } |
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1869 _priority_buffer[last] = retired_and_set; |
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1870 } |
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1871 }; |
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1872 |
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1873 class G1ParScanThreadState : public StackObj { |
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1874 protected: |
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1875 G1CollectedHeap* _g1h; |
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1876 RefToScanQueue* _refs; |
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1877 DirtyCardQueue _dcq; |
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1878 CardTableModRefBS* _ct_bs; |
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1879 G1RemSet* _g1_rem; |
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1880 |
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1881 G1ParGCAllocBufferContainer _surviving_alloc_buffer; |
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1882 G1ParGCAllocBufferContainer _tenured_alloc_buffer; |
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1883 G1ParGCAllocBufferContainer* _alloc_buffers[GCAllocPurposeCount]; |
|
1391
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1884 ageTable _age_table; |
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1885 |
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1886 size_t _alloc_buffer_waste; |
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1887 size_t _undo_waste; |
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1888 |
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1889 OopsInHeapRegionClosure* _evac_failure_cl; |
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1890 G1ParScanHeapEvacClosure* _evac_cl; |
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1891 G1ParScanPartialArrayClosure* _partial_scan_cl; |
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1892 |
| 10405 | 1893 int _hash_seed; |
|
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1894 uint _queue_num; |
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1895 |
| 1611 | 1896 size_t _term_attempts; |
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1897 |
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1898 double _start; |
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1899 double _start_strong_roots; |
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1900 double _strong_roots_time; |
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1901 double _start_term; |
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1902 double _term_time; |
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1903 |
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1904 // Map from young-age-index (0 == not young, 1 is youngest) to |
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1905 // surviving words. base is what we get back from the malloc call |
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1906 size_t* _surviving_young_words_base; |
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1907 // this points into the array, as we use the first few entries for padding |
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1908 size_t* _surviving_young_words; |
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1909 |
| 1709 | 1910 #define PADDING_ELEM_NUM (DEFAULT_CACHE_LINE_SIZE / sizeof(size_t)) |
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1911 |
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1912 void add_to_alloc_buffer_waste(size_t waste) { _alloc_buffer_waste += waste; } |
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1913 |
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1914 void add_to_undo_waste(size_t waste) { _undo_waste += waste; } |
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1915 |
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1916 DirtyCardQueue& dirty_card_queue() { return _dcq; } |
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1917 CardTableModRefBS* ctbs() { return _ct_bs; } |
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1918 |
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1919 template <class T> void immediate_rs_update(HeapRegion* from, T* p, int tid) { |
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1920 if (!from->is_survivor()) { |
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1921 _g1_rem->par_write_ref(from, p, tid); |
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1922 } |
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1923 } |
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1924 |
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1925 template <class T> void deferred_rs_update(HeapRegion* from, T* p, int tid) { |
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1926 // If the new value of the field points to the same region or |
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1927 // is the to-space, we don't need to include it in the Rset updates. |
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1928 if (!from->is_in_reserved(oopDesc::load_decode_heap_oop(p)) && !from->is_survivor()) { |
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1929 size_t card_index = ctbs()->index_for(p); |
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1930 // If the card hasn't been added to the buffer, do it. |
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1931 if (ctbs()->mark_card_deferred(card_index)) { |
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1932 dirty_card_queue().enqueue((jbyte*)ctbs()->byte_for_index(card_index)); |
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1933 } |
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1934 } |
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1935 } |
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1936 |
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1937 public: |
|
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1938 G1ParScanThreadState(G1CollectedHeap* g1h, uint queue_num); |
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1939 |
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1940 ~G1ParScanThreadState() { |
| 6197 | 1941 FREE_C_HEAP_ARRAY(size_t, _surviving_young_words_base, mtGC); |
|
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1942 } |
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1943 |
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1944 RefToScanQueue* refs() { return _refs; } |
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1945 ageTable* age_table() { return &_age_table; } |
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1946 |
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1947 G1ParGCAllocBufferContainer* alloc_buffer(GCAllocPurpose purpose) { |
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1948 return _alloc_buffers[purpose]; |
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1949 } |
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1950 |
| 1709 | 1951 size_t alloc_buffer_waste() const { return _alloc_buffer_waste; } |
| 1952 size_t undo_waste() const { return _undo_waste; } | |
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1953 |
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1954 #ifdef ASSERT |
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1955 bool verify_ref(narrowOop* ref) const; |
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1956 bool verify_ref(oop* ref) const; |
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1957 bool verify_task(StarTask ref) const; |
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1958 #endif // ASSERT |
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1959 |
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1960 template <class T> void push_on_queue(T* ref) { |
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1961 assert(verify_ref(ref), "sanity"); |
| 1709 | 1962 refs()->push(ref); |
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1963 } |
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1964 |
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1965 template <class T> void update_rs(HeapRegion* from, T* p, int tid) { |
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1966 if (G1DeferredRSUpdate) { |
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1967 deferred_rs_update(from, p, tid); |
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1968 } else { |
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1969 immediate_rs_update(from, p, tid); |
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1970 } |
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1971 } |
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1972 |
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1973 HeapWord* allocate_slow(GCAllocPurpose purpose, size_t word_sz) { |
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1974 HeapWord* obj = NULL; |
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1975 size_t gclab_word_size = _g1h->desired_plab_sz(purpose); |
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1976 if (word_sz * 100 < gclab_word_size * ParallelGCBufferWastePct) { |
|
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1977 G1ParGCAllocBufferContainer* alloc_buf = alloc_buffer(purpose); |
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1978 |
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1979 HeapWord* buf = _g1h->par_allocate_during_gc(purpose, gclab_word_size); |
|
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1980 if (buf == NULL) return NULL; // Let caller handle allocation failure. |
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1981 |
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1982 add_to_alloc_buffer_waste(alloc_buf->words_remaining_in_retired_buffer()); |
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1983 alloc_buf->update(false /* end_of_gc */, false /* retain */, buf, gclab_word_size); |
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1984 |
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1985 obj = alloc_buf->allocate(word_sz); |
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1986 assert(obj != NULL, "buffer was definitely big enough..."); |
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1987 } else { |
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1988 obj = _g1h->par_allocate_during_gc(purpose, word_sz); |
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1989 } |
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1990 return obj; |
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1991 } |
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1992 |
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1993 HeapWord* allocate(GCAllocPurpose purpose, size_t word_sz) { |
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1994 HeapWord* obj = alloc_buffer(purpose)->allocate(word_sz); |
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1995 if (obj != NULL) return obj; |
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1996 return allocate_slow(purpose, word_sz); |
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1997 } |
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1998 |
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1999 void undo_allocation(GCAllocPurpose purpose, HeapWord* obj, size_t word_sz) { |
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2000 if (alloc_buffer(purpose)->contains(obj)) { |
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2001 assert(alloc_buffer(purpose)->contains(obj + word_sz - 1), |
|
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2002 "should contain whole object"); |
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2003 alloc_buffer(purpose)->undo_allocation(obj, word_sz); |
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2004 } else { |
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2005 CollectedHeap::fill_with_object(obj, word_sz); |
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2006 add_to_undo_waste(word_sz); |
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2007 } |
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2008 } |
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2009 |
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2010 void set_evac_failure_closure(OopsInHeapRegionClosure* evac_failure_cl) { |
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2011 _evac_failure_cl = evac_failure_cl; |
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2012 } |
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2013 OopsInHeapRegionClosure* evac_failure_closure() { |
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2014 return _evac_failure_cl; |
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2015 } |
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2016 |
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2017 void set_evac_closure(G1ParScanHeapEvacClosure* evac_cl) { |
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2018 _evac_cl = evac_cl; |
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2019 } |
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2020 |
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2021 void set_partial_scan_closure(G1ParScanPartialArrayClosure* partial_scan_cl) { |
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2022 _partial_scan_cl = partial_scan_cl; |
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2023 } |
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2024 |
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2025 int* hash_seed() { return &_hash_seed; } |
|
4836
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2026 uint queue_num() { return _queue_num; } |
|
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2027 |
| 1709 | 2028 size_t term_attempts() const { return _term_attempts; } |
| 1611 | 2029 void note_term_attempt() { _term_attempts++; } |
|
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2030 |
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2031 void start_strong_roots() { |
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2032 _start_strong_roots = os::elapsedTime(); |
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2033 } |
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2034 void end_strong_roots() { |
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2035 _strong_roots_time += (os::elapsedTime() - _start_strong_roots); |
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2036 } |
| 1709 | 2037 double strong_roots_time() const { return _strong_roots_time; } |
|
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2038 |
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2039 void start_term_time() { |
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2040 note_term_attempt(); |
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2041 _start_term = os::elapsedTime(); |
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2042 } |
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2043 void end_term_time() { |
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2044 _term_time += (os::elapsedTime() - _start_term); |
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2045 } |
| 1709 | 2046 double term_time() const { return _term_time; } |
|
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2047 |
| 1709 | 2048 double elapsed_time() const { |
|
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2049 return os::elapsedTime() - _start; |
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2050 } |
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2051 |
| 1709 | 2052 static void |
| 2053 print_termination_stats_hdr(outputStream* const st = gclog_or_tty); | |
| 2054 void | |
| 2055 print_termination_stats(int i, outputStream* const st = gclog_or_tty) const; | |
| 2056 | |
|
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2057 size_t* surviving_young_words() { |
|
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2058 // We add on to hide entry 0 which accumulates surviving words for |
|
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2059 // age -1 regions (i.e. non-young ones) |
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2060 return _surviving_young_words; |
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2061 } |
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2062 |
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2063 void retire_alloc_buffers() { |
|
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2064 for (int ap = 0; ap < GCAllocPurposeCount; ++ap) { |
|
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2065 size_t waste = _alloc_buffers[ap]->words_remaining(); |
|
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2066 add_to_alloc_buffer_waste(waste); |
| 6595 | 2067 _alloc_buffers[ap]->flush_stats_and_retire(_g1h->stats_for_purpose((GCAllocPurpose)ap), |
| 2068 true /* end_of_gc */, | |
| 2069 false /* retain */); | |
|
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2070 } |
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2071 } |
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2072 |
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2073 template <class T> void deal_with_reference(T* ref_to_scan) { |
|
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2074 if (has_partial_array_mask(ref_to_scan)) { |
|
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2075 _partial_scan_cl->do_oop_nv(ref_to_scan); |
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2076 } else { |
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2077 // Note: we can use "raw" versions of "region_containing" because |
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2078 // "obj_to_scan" is definitely in the heap, and is not in a |
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2079 // humongous region. |
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2080 HeapRegion* r = _g1h->heap_region_containing_raw(ref_to_scan); |
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2081 _evac_cl->set_region(r); |
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2082 _evac_cl->do_oop_nv(ref_to_scan); |
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2083 } |
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2084 } |
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2085 |
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2086 void deal_with_reference(StarTask ref) { |
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2087 assert(verify_task(ref), "sanity"); |
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2088 if (ref.is_narrow()) { |
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2089 deal_with_reference((narrowOop*)ref); |
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2090 } else { |
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2091 deal_with_reference((oop*)ref); |
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2092 } |
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2093 } |
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2094 |
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2095 void trim_queue(); |
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2096 }; |
| 1972 | 2097 |
| 2098 #endif // SHARE_VM_GC_IMPLEMENTATION_G1_G1COLLECTEDHEAP_HPP |