Mercurial > hg > graal-compiler
annotate src/share/vm/gc_implementation/g1/g1CollectedHeap.hpp @ 10179:a08c80e9e1e5
8012687: Remove unused is_root checks and closures
Reviewed-by: tschatzl, jmasa
| author | stefank |
|---|---|
| date | Mon, 22 Apr 2013 20:27:36 +0200 |
| parents | 7b835924c31c |
| children | 5c93c1f61226 |
| rev | line source |
|---|---|
| 342 | 1 /* |
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2 * Copyright (c) 2001, 2012, Oracle and/or its affiliates. All rights reserved. |
| 342 | 3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
| 4 * | |
| 5 * This code is free software; you can redistribute it and/or modify it | |
| 6 * under the terms of the GNU General Public License version 2 only, as | |
| 7 * published by the Free Software Foundation. | |
| 8 * | |
| 9 * This code is distributed in the hope that it will be useful, but WITHOUT | |
| 10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or | |
| 11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License | |
| 12 * version 2 for more details (a copy is included in the LICENSE file that | |
| 13 * accompanied this code). | |
| 14 * | |
| 15 * You should have received a copy of the GNU General Public License version | |
| 16 * 2 along with this work; if not, write to the Free Software Foundation, | |
| 17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. | |
| 18 * | |
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19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
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20 * or visit www.oracle.com if you need additional information or have any |
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21 * questions. |
| 342 | 22 * |
| 23 */ | |
| 24 | |
| 1972 | 25 #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" | |
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29 #include "gc_implementation/g1/g1AllocRegion.hpp" |
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30 #include "gc_implementation/g1/g1HRPrinter.hpp" |
| 1972 | 31 #include "gc_implementation/g1/g1RemSet.hpp" |
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32 #include "gc_implementation/g1/g1MonitoringSupport.hpp" |
| 3766 | 33 #include "gc_implementation/g1/heapRegionSeq.hpp" |
| 2152 | 34 #include "gc_implementation/g1/heapRegionSets.hpp" |
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35 #include "gc_implementation/shared/hSpaceCounters.hpp" |
| 6595 | 36 #include "gc_implementation/shared/parGCAllocBuffer.hpp" |
| 1972 | 37 #include "memory/barrierSet.hpp" |
| 38 #include "memory/memRegion.hpp" | |
| 39 #include "memory/sharedHeap.hpp" | |
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40 #include "utilities/stack.hpp" |
| 1972 | 41 |
| 342 | 42 // A "G1CollectedHeap" is an implementation of a java heap for HotSpot. |
| 43 // It uses the "Garbage First" heap organization and algorithm, which | |
| 44 // may combine concurrent marking with parallel, incremental compaction of | |
| 45 // heap subsets that will yield large amounts of garbage. | |
| 46 | |
| 47 class HeapRegion; | |
| 2173 | 48 class HRRSCleanupTask; |
| 342 | 49 class GenerationSpec; |
| 50 class OopsInHeapRegionClosure; | |
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51 class G1KlassScanClosure; |
| 342 | 52 class G1ScanHeapEvacClosure; |
| 53 class ObjectClosure; | |
| 54 class SpaceClosure; | |
| 55 class CompactibleSpaceClosure; | |
| 56 class Space; | |
| 57 class G1CollectorPolicy; | |
| 58 class GenRemSet; | |
| 59 class G1RemSet; | |
| 60 class HeapRegionRemSetIterator; | |
| 61 class ConcurrentMark; | |
| 62 class ConcurrentMarkThread; | |
| 63 class ConcurrentG1Refine; | |
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64 class GenerationCounters; |
| 342 | 65 |
| 6197 | 66 typedef OverflowTaskQueue<StarTask, mtGC> RefToScanQueue; |
| 67 typedef GenericTaskQueueSet<RefToScanQueue, mtGC> RefToScanQueueSet; | |
| 342 | 68 |
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69 typedef int RegionIdx_t; // needs to hold [ 0..max_regions() ) |
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70 typedef int CardIdx_t; // needs to hold [ 0..CardsPerRegion ) |
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71 |
| 342 | 72 enum GCAllocPurpose { |
| 73 GCAllocForTenured, | |
| 74 GCAllocForSurvived, | |
| 75 GCAllocPurposeCount | |
| 76 }; | |
| 77 | |
| 6197 | 78 class YoungList : public CHeapObj<mtGC> { |
| 342 | 79 private: |
| 80 G1CollectedHeap* _g1h; | |
| 81 | |
| 82 HeapRegion* _head; | |
| 83 | |
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84 HeapRegion* _survivor_head; |
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85 HeapRegion* _survivor_tail; |
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86 |
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87 HeapRegion* _curr; |
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88 |
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89 uint _length; |
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90 uint _survivor_length; |
| 342 | 91 |
| 92 size_t _last_sampled_rs_lengths; | |
| 93 size_t _sampled_rs_lengths; | |
| 94 | |
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95 void empty_list(HeapRegion* list); |
| 342 | 96 |
| 97 public: | |
| 98 YoungList(G1CollectedHeap* g1h); | |
| 99 | |
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100 void push_region(HeapRegion* hr); |
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101 void add_survivor_region(HeapRegion* hr); |
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102 |
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103 void empty_list(); |
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104 bool is_empty() { return _length == 0; } |
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105 uint length() { return _length; } |
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106 uint survivor_length() { return _survivor_length; } |
| 342 | 107 |
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108 // Currently we do not keep track of the used byte sum for the |
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109 // young list and the survivors and it'd be quite a lot of work to |
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110 // do so. When we'll eventually replace the young list with |
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111 // instances of HeapRegionLinkedList we'll get that for free. So, |
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112 // we'll report the more accurate information then. |
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113 size_t eden_used_bytes() { |
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114 assert(length() >= survivor_length(), "invariant"); |
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115 return (size_t) (length() - survivor_length()) * HeapRegion::GrainBytes; |
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116 } |
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117 size_t survivor_used_bytes() { |
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118 return (size_t) survivor_length() * HeapRegion::GrainBytes; |
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119 } |
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120 |
| 342 | 121 void rs_length_sampling_init(); |
| 122 bool rs_length_sampling_more(); | |
| 123 void rs_length_sampling_next(); | |
| 124 | |
| 125 void reset_sampled_info() { | |
| 126 _last_sampled_rs_lengths = 0; | |
| 127 } | |
| 128 size_t sampled_rs_lengths() { return _last_sampled_rs_lengths; } | |
| 129 | |
| 130 // for development purposes | |
| 131 void reset_auxilary_lists(); | |
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132 void clear() { _head = NULL; _length = 0; } |
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133 |
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134 void clear_survivors() { |
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135 _survivor_head = NULL; |
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136 _survivor_tail = NULL; |
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137 _survivor_length = 0; |
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138 } |
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139 |
| 342 | 140 HeapRegion* first_region() { return _head; } |
| 141 HeapRegion* first_survivor_region() { return _survivor_head; } | |
| 545 | 142 HeapRegion* last_survivor_region() { return _survivor_tail; } |
| 342 | 143 |
| 144 // debugging | |
| 145 bool check_list_well_formed(); | |
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146 bool check_list_empty(bool check_sample = true); |
| 342 | 147 void print(); |
| 148 }; | |
| 149 | |
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150 class MutatorAllocRegion : public G1AllocRegion { |
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151 protected: |
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152 virtual HeapRegion* allocate_new_region(size_t word_size, bool force); |
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153 virtual void retire_region(HeapRegion* alloc_region, size_t allocated_bytes); |
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154 public: |
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155 MutatorAllocRegion() |
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156 : G1AllocRegion("Mutator Alloc Region", false /* bot_updates */) { } |
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157 }; |
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158 |
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159 // The G1 STW is alive closure. |
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160 // An instance is embedded into the G1CH and used as the |
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161 // (optional) _is_alive_non_header closure in the STW |
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162 // reference processor. It is also extensively used during |
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163 // refence processing during STW evacuation pauses. |
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164 class G1STWIsAliveClosure: public BoolObjectClosure { |
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165 G1CollectedHeap* _g1; |
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166 public: |
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167 G1STWIsAliveClosure(G1CollectedHeap* g1) : _g1(g1) {} |
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168 void do_object(oop p) { assert(false, "Do not call."); } |
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169 bool do_object_b(oop p); |
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170 }; |
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171 |
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172 class SurvivorGCAllocRegion : public G1AllocRegion { |
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173 protected: |
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174 virtual HeapRegion* allocate_new_region(size_t word_size, bool force); |
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175 virtual void retire_region(HeapRegion* alloc_region, size_t allocated_bytes); |
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176 public: |
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177 SurvivorGCAllocRegion() |
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178 : G1AllocRegion("Survivor GC Alloc Region", false /* bot_updates */) { } |
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179 }; |
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180 |
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181 class OldGCAllocRegion : public G1AllocRegion { |
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182 protected: |
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183 virtual HeapRegion* allocate_new_region(size_t word_size, bool force); |
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184 virtual void retire_region(HeapRegion* alloc_region, size_t allocated_bytes); |
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185 public: |
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186 OldGCAllocRegion() |
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187 : G1AllocRegion("Old GC Alloc Region", true /* bot_updates */) { } |
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188 }; |
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189 |
| 342 | 190 class RefineCardTableEntryClosure; |
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191 |
| 342 | 192 class G1CollectedHeap : public SharedHeap { |
| 193 friend class VM_G1CollectForAllocation; | |
| 194 friend class VM_G1CollectFull; | |
| 195 friend class VM_G1IncCollectionPause; | |
| 196 friend class VMStructs; | |
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197 friend class MutatorAllocRegion; |
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198 friend class SurvivorGCAllocRegion; |
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199 friend class OldGCAllocRegion; |
| 342 | 200 |
| 201 // Closures used in implementation. | |
| 5987 | 202 template <bool do_gen_barrier, G1Barrier barrier, bool do_mark_object> |
| 203 friend class G1ParCopyClosure; | |
| 342 | 204 friend class G1IsAliveClosure; |
| 205 friend class G1EvacuateFollowersClosure; | |
| 206 friend class G1ParScanThreadState; | |
| 207 friend class G1ParScanClosureSuper; | |
| 208 friend class G1ParEvacuateFollowersClosure; | |
| 209 friend class G1ParTask; | |
| 210 friend class G1FreeGarbageRegionClosure; | |
| 211 friend class RefineCardTableEntryClosure; | |
| 212 friend class G1PrepareCompactClosure; | |
| 213 friend class RegionSorter; | |
| 2152 | 214 friend class RegionResetter; |
| 342 | 215 friend class CountRCClosure; |
| 216 friend class EvacPopObjClosure; | |
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217 friend class G1ParCleanupCTTask; |
| 342 | 218 |
| 219 // Other related classes. | |
| 220 friend class G1MarkSweep; | |
| 221 | |
| 222 private: | |
| 223 // The one and only G1CollectedHeap, so static functions can find it. | |
| 224 static G1CollectedHeap* _g1h; | |
| 225 | |
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226 static size_t _humongous_object_threshold_in_words; |
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227 |
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228 // Storage for the G1 heap. |
| 342 | 229 VirtualSpace _g1_storage; |
| 230 MemRegion _g1_reserved; | |
| 231 | |
| 232 // The part of _g1_storage that is currently committed. | |
| 233 MemRegion _g1_committed; | |
| 234 | |
| 2152 | 235 // The master free list. It will satisfy all new region allocations. |
| 236 MasterFreeRegionList _free_list; | |
| 237 | |
| 238 // The secondary free list which contains regions that have been | |
| 239 // freed up during the cleanup process. This will be appended to the | |
| 240 // master free list when appropriate. | |
| 241 SecondaryFreeRegionList _secondary_free_list; | |
| 242 | |
| 4072 | 243 // It keeps track of the old regions. |
| 244 MasterOldRegionSet _old_set; | |
| 245 | |
| 2152 | 246 // It keeps track of the humongous regions. |
| 247 MasterHumongousRegionSet _humongous_set; | |
| 342 | 248 |
| 249 // The number of regions we could create by expansion. | |
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250 uint _expansion_regions; |
| 342 | 251 |
| 252 // The block offset table for the G1 heap. | |
| 253 G1BlockOffsetSharedArray* _bot_shared; | |
| 254 | |
| 4072 | 255 // Tears down the region sets / lists so that they are empty and the |
| 256 // regions on the heap do not belong to a region set / list. The | |
| 257 // only exception is the humongous set which we leave unaltered. If | |
| 258 // free_list_only is true, it will only tear down the master free | |
| 259 // list. It is called before a Full GC (free_list_only == false) or | |
| 260 // before heap shrinking (free_list_only == true). | |
| 261 void tear_down_region_sets(bool free_list_only); | |
| 262 | |
| 263 // Rebuilds the region sets / lists so that they are repopulated to | |
| 264 // reflect the contents of the heap. The only exception is the | |
| 265 // humongous set which was not torn down in the first place. If | |
| 266 // free_list_only is true, it will only rebuild the master free | |
| 267 // list. It is called after a Full GC (free_list_only == false) or | |
| 268 // after heap shrinking (free_list_only == true). | |
| 269 void rebuild_region_sets(bool free_list_only); | |
| 342 | 270 |
| 271 // The sequence of all heap regions in the heap. | |
| 3766 | 272 HeapRegionSeq _hrs; |
| 342 | 273 |
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274 // Alloc region used to satisfy mutator allocation requests. |
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275 MutatorAllocRegion _mutator_alloc_region; |
| 342 | 276 |
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277 // Alloc region used to satisfy allocation requests by the GC for |
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278 // survivor objects. |
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279 SurvivorGCAllocRegion _survivor_gc_alloc_region; |
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280 |
| 6595 | 281 // PLAB sizing policy for survivors. |
| 282 PLABStats _survivor_plab_stats; | |
| 283 | |
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284 // Alloc region used to satisfy allocation requests by the GC for |
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285 // old objects. |
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286 OldGCAllocRegion _old_gc_alloc_region; |
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287 |
| 6595 | 288 // PLAB sizing policy for tenured objects. |
| 289 PLABStats _old_plab_stats; | |
| 290 | |
| 291 PLABStats* stats_for_purpose(GCAllocPurpose purpose) { | |
| 292 PLABStats* stats = NULL; | |
| 293 | |
| 294 switch (purpose) { | |
| 295 case GCAllocForSurvived: | |
| 296 stats = &_survivor_plab_stats; | |
| 297 break; | |
| 298 case GCAllocForTenured: | |
| 299 stats = &_old_plab_stats; | |
| 300 break; | |
| 301 default: | |
| 302 assert(false, "unrecognized GCAllocPurpose"); | |
| 303 } | |
| 304 | |
| 305 return stats; | |
| 306 } | |
| 307 | |
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308 // The last old region we allocated to during the last GC. |
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309 // Typically, it is not full so we should re-use it during the next GC. |
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310 HeapRegion* _retained_old_gc_alloc_region; |
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311 |
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312 // It specifies whether we should attempt to expand the heap after a |
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313 // region allocation failure. If heap expansion fails we set this to |
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314 // false so that we don't re-attempt the heap expansion (it's likely |
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315 // that subsequent expansion attempts will also fail if one fails). |
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316 // Currently, it is only consulted during GC and it's reset at the |
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317 // start of each GC. |
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318 bool _expand_heap_after_alloc_failure; |
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319 |
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320 // It resets the mutator alloc region before new allocations can take place. |
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321 void init_mutator_alloc_region(); |
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322 |
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323 // It releases the mutator alloc region. |
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324 void release_mutator_alloc_region(); |
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325 |
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326 // It initializes the GC alloc regions at the start of a GC. |
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327 void init_gc_alloc_regions(); |
| 342 | 328 |
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329 // It releases the GC alloc regions at the end of a GC. |
| 6819 | 330 void release_gc_alloc_regions(uint no_of_gc_workers); |
| 342 | 331 |
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332 // It does any cleanup that needs to be done on the GC alloc regions |
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333 // before a Full GC. |
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334 void abandon_gc_alloc_regions(); |
| 342 | 335 |
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336 // Helper for monitoring and management support. |
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337 G1MonitoringSupport* _g1mm; |
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338 |
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339 // Determines PLAB size for a particular allocation purpose. |
| 6595 | 340 size_t desired_plab_sz(GCAllocPurpose purpose); |
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341 |
| 342 | 342 // Outside of GC pauses, the number of bytes used in all regions other |
| 343 // than the current allocation region. | |
| 344 size_t _summary_bytes_used; | |
| 345 | |
| 526 | 346 // This is used for a quick test on whether a reference points into |
| 347 // the collection set or not. Basically, we have an array, with one | |
| 348 // byte per region, and that byte denotes whether the corresponding | |
| 349 // region is in the collection set or not. The entry corresponding | |
| 350 // the bottom of the heap, i.e., region 0, is pointed to by | |
| 351 // _in_cset_fast_test_base. The _in_cset_fast_test field has been | |
| 352 // biased so that it actually points to address 0 of the address | |
| 353 // space, to make the test as fast as possible (we can simply shift | |
| 354 // the address to address into it, instead of having to subtract the | |
| 355 // bottom of the heap from the address before shifting it; basically | |
| 356 // it works in the same way the card table works). | |
| 357 bool* _in_cset_fast_test; | |
| 358 | |
| 359 // The allocated array used for the fast test on whether a reference | |
| 360 // points into the collection set or not. This field is also used to | |
| 361 // free the array. | |
| 362 bool* _in_cset_fast_test_base; | |
| 363 | |
| 364 // The length of the _in_cset_fast_test_base array. | |
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365 uint _in_cset_fast_test_length; |
| 526 | 366 |
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367 volatile unsigned _gc_time_stamp; |
| 342 | 368 |
| 369 size_t* _surviving_young_words; | |
| 370 | |
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371 G1HRPrinter _hr_printer; |
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372 |
| 342 | 373 void setup_surviving_young_words(); |
| 374 void update_surviving_young_words(size_t* surv_young_words); | |
| 375 void cleanup_surviving_young_words(); | |
| 376 | |
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377 // It decides whether an explicit GC should start a concurrent cycle |
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378 // instead of doing a STW GC. Currently, a concurrent cycle is |
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379 // explicitly started if: |
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380 // (a) cause == _gc_locker and +GCLockerInvokesConcurrent, or |
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381 // (b) cause == _java_lang_system_gc and +ExplicitGCInvokesConcurrent. |
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382 // (c) cause == _g1_humongous_allocation |
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383 bool should_do_concurrent_full_gc(GCCause::Cause cause); |
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384 |
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385 // Keeps track of how many "old marking cycles" (i.e., Full GCs or |
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386 // concurrent cycles) we have started. |
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387 volatile unsigned int _old_marking_cycles_started; |
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388 |
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389 // Keeps track of how many "old marking cycles" (i.e., Full GCs or |
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390 // concurrent cycles) we have completed. |
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391 volatile unsigned int _old_marking_cycles_completed; |
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392 |
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393 // This is a non-product method that is helpful for testing. It is |
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394 // called at the end of a GC and artificially expands the heap by |
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395 // allocating a number of dead regions. This way we can induce very |
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396 // frequent marking cycles and stress the cleanup / concurrent |
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397 // cleanup code more (as all the regions that will be allocated by |
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398 // this method will be found dead by the marking cycle). |
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399 void allocate_dummy_regions() PRODUCT_RETURN; |
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400 |
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401 // Clear RSets after a compaction. It also resets the GC time stamps. |
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402 void clear_rsets_post_compaction(); |
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403 |
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404 // If the HR printer is active, dump the state of the regions in the |
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405 // heap after a compaction. |
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406 void print_hrs_post_compaction(); |
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407 |
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408 double verify(bool guard, const char* msg); |
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409 void verify_before_gc(); |
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410 void verify_after_gc(); |
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411 |
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412 void log_gc_header(); |
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413 void log_gc_footer(double pause_time_sec); |
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414 |
| 1973 | 415 // These are macros so that, if the assert fires, we get the correct |
| 416 // line number, file, etc. | |
| 417 | |
| 2361 | 418 #define heap_locking_asserts_err_msg(_extra_message_) \ |
| 2152 | 419 err_msg("%s : Heap_lock locked: %s, at safepoint: %s, is VM thread: %s", \ |
| 2361 | 420 (_extra_message_), \ |
| 2152 | 421 BOOL_TO_STR(Heap_lock->owned_by_self()), \ |
| 422 BOOL_TO_STR(SafepointSynchronize::is_at_safepoint()), \ | |
| 423 BOOL_TO_STR(Thread::current()->is_VM_thread())) | |
| 1973 | 424 |
| 425 #define assert_heap_locked() \ | |
| 426 do { \ | |
| 427 assert(Heap_lock->owned_by_self(), \ | |
| 428 heap_locking_asserts_err_msg("should be holding the Heap_lock")); \ | |
| 429 } while (0) | |
| 430 | |
| 2361 | 431 #define assert_heap_locked_or_at_safepoint(_should_be_vm_thread_) \ |
| 1973 | 432 do { \ |
| 433 assert(Heap_lock->owned_by_self() || \ | |
| 2152 | 434 (SafepointSynchronize::is_at_safepoint() && \ |
| 2361 | 435 ((_should_be_vm_thread_) == Thread::current()->is_VM_thread())), \ |
| 1973 | 436 heap_locking_asserts_err_msg("should be holding the Heap_lock or " \ |
| 437 "should be at a safepoint")); \ | |
| 438 } while (0) | |
| 439 | |
| 440 #define assert_heap_locked_and_not_at_safepoint() \ | |
| 441 do { \ | |
| 442 assert(Heap_lock->owned_by_self() && \ | |
| 443 !SafepointSynchronize::is_at_safepoint(), \ | |
| 444 heap_locking_asserts_err_msg("should be holding the Heap_lock and " \ | |
| 445 "should not be at a safepoint")); \ | |
| 446 } while (0) | |
| 447 | |
| 448 #define assert_heap_not_locked() \ | |
| 449 do { \ | |
| 450 assert(!Heap_lock->owned_by_self(), \ | |
| 451 heap_locking_asserts_err_msg("should not be holding the Heap_lock")); \ | |
| 452 } while (0) | |
| 453 | |
| 454 #define assert_heap_not_locked_and_not_at_safepoint() \ | |
| 455 do { \ | |
| 456 assert(!Heap_lock->owned_by_self() && \ | |
| 457 !SafepointSynchronize::is_at_safepoint(), \ | |
| 458 heap_locking_asserts_err_msg("should not be holding the Heap_lock and " \ | |
| 459 "should not be at a safepoint")); \ | |
| 460 } while (0) | |
| 461 | |
| 2361 | 462 #define assert_at_safepoint(_should_be_vm_thread_) \ |
| 1973 | 463 do { \ |
| 2152 | 464 assert(SafepointSynchronize::is_at_safepoint() && \ |
| 2361 | 465 ((_should_be_vm_thread_) == Thread::current()->is_VM_thread()), \ |
| 1973 | 466 heap_locking_asserts_err_msg("should be at a safepoint")); \ |
| 467 } while (0) | |
| 468 | |
| 469 #define assert_not_at_safepoint() \ | |
| 470 do { \ | |
| 471 assert(!SafepointSynchronize::is_at_safepoint(), \ | |
| 472 heap_locking_asserts_err_msg("should not be at a safepoint")); \ | |
| 473 } while (0) | |
| 474 | |
| 342 | 475 protected: |
| 476 | |
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477 // The young region list. |
| 342 | 478 YoungList* _young_list; |
| 479 | |
| 480 // The current policy object for the collector. | |
| 481 G1CollectorPolicy* _g1_policy; | |
| 482 | |
| 2152 | 483 // This is the second level of trying to allocate a new region. If |
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484 // new_region() didn't find a region on the free_list, this call will |
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485 // check whether there's anything available on the |
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486 // secondary_free_list and/or wait for more regions to appear on |
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487 // that list, if _free_regions_coming is set. |
| 2361 | 488 HeapRegion* new_region_try_secondary_free_list(); |
| 342 | 489 |
| 2361 | 490 // Try to allocate a single non-humongous HeapRegion sufficient for |
| 491 // an allocation of the given word_size. If do_expand is true, | |
| 492 // attempt to expand the heap if necessary to satisfy the allocation | |
| 493 // request. | |
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494 HeapRegion* new_region(size_t word_size, bool do_expand); |
| 342 | 495 |
| 2361 | 496 // Attempt to satisfy a humongous allocation request of the given |
| 497 // size by finding a contiguous set of free regions of num_regions | |
| 498 // length and remove them from the master free list. Return the | |
| 3766 | 499 // index of the first region or G1_NULL_HRS_INDEX if the search |
| 500 // was unsuccessful. | |
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501 uint humongous_obj_allocate_find_first(uint num_regions, |
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502 size_t word_size); |
| 342 | 503 |
| 2361 | 504 // Initialize a contiguous set of free regions of length num_regions |
| 505 // and starting at index first so that they appear as a single | |
| 506 // humongous region. | |
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507 HeapWord* humongous_obj_allocate_initialize_regions(uint first, |
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508 uint num_regions, |
| 2361 | 509 size_t word_size); |
| 510 | |
| 511 // Attempt to allocate a humongous object of the given size. Return | |
| 512 // NULL if unsuccessful. | |
| 2152 | 513 HeapWord* humongous_obj_allocate(size_t word_size); |
| 1973 | 514 |
| 515 // The following two methods, allocate_new_tlab() and | |
| 516 // mem_allocate(), are the two main entry points from the runtime | |
| 517 // into the G1's allocation routines. They have the following | |
| 518 // assumptions: | |
| 519 // | |
| 520 // * They should both be called outside safepoints. | |
| 521 // | |
| 522 // * They should both be called without holding the Heap_lock. | |
| 523 // | |
| 524 // * All allocation requests for new TLABs should go to | |
| 525 // allocate_new_tlab(). | |
| 526 // | |
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527 // * All non-TLAB allocation requests should go to mem_allocate(). |
| 1973 | 528 // |
| 529 // * If either call cannot satisfy the allocation request using the | |
| 530 // current allocating region, they will try to get a new one. If | |
| 531 // this fails, they will attempt to do an evacuation pause and | |
| 532 // retry the allocation. | |
| 533 // | |
| 534 // * If all allocation attempts fail, even after trying to schedule | |
| 535 // an evacuation pause, allocate_new_tlab() will return NULL, | |
| 536 // whereas mem_allocate() will attempt a heap expansion and/or | |
| 537 // schedule a Full GC. | |
| 538 // | |
| 539 // * We do not allow humongous-sized TLABs. So, allocate_new_tlab | |
| 540 // should never be called with word_size being humongous. All | |
| 541 // humongous allocation requests should go to mem_allocate() which | |
| 542 // will satisfy them with a special path. | |
| 543 | |
| 544 virtual HeapWord* allocate_new_tlab(size_t word_size); | |
| 545 | |
| 546 virtual HeapWord* mem_allocate(size_t word_size, | |
| 547 bool* gc_overhead_limit_was_exceeded); | |
| 342 | 548 |
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549 // The following three methods take a gc_count_before_ret |
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550 // parameter which is used to return the GC count if the method |
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551 // returns NULL. Given that we are required to read the GC count |
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552 // while holding the Heap_lock, and these paths will take the |
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553 // Heap_lock at some point, it's easier to get them to read the GC |
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554 // count while holding the Heap_lock before they return NULL instead |
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555 // of the caller (namely: mem_allocate()) having to also take the |
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556 // Heap_lock just to read the GC count. |
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557 |
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558 // First-level mutator allocation attempt: try to allocate out of |
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559 // the mutator alloc region without taking the Heap_lock. This |
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560 // should only be used for non-humongous allocations. |
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561 inline HeapWord* attempt_allocation(size_t word_size, |
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562 unsigned int* gc_count_before_ret, |
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563 int* gclocker_retry_count_ret); |
| 342 | 564 |
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565 // Second-level mutator allocation attempt: take the Heap_lock and |
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566 // retry the allocation attempt, potentially scheduling a GC |
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567 // pause. This should only be used for non-humongous allocations. |
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568 HeapWord* attempt_allocation_slow(size_t word_size, |
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569 unsigned int* gc_count_before_ret, |
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570 int* gclocker_retry_count_ret); |
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571 |
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572 // Takes the Heap_lock and attempts a humongous allocation. It can |
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573 // potentially schedule a GC pause. |
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574 HeapWord* attempt_allocation_humongous(size_t word_size, |
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575 unsigned int* gc_count_before_ret, |
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576 int* gclocker_retry_count_ret); |
| 1973 | 577 |
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578 // Allocation attempt that should be called during safepoints (e.g., |
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579 // at the end of a successful GC). expect_null_mutator_alloc_region |
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580 // specifies whether the mutator alloc region is expected to be NULL |
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581 // or not. |
| 1973 | 582 HeapWord* attempt_allocation_at_safepoint(size_t word_size, |
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583 bool expect_null_mutator_alloc_region); |
| 1973 | 584 |
| 585 // It dirties the cards that cover the block so that so that the post | |
| 586 // write barrier never queues anything when updating objects on this | |
| 587 // block. It is assumed (and in fact we assert) that the block | |
| 588 // belongs to a young region. | |
| 589 inline void dirty_young_block(HeapWord* start, size_t word_size); | |
| 342 | 590 |
| 591 // Allocate blocks during garbage collection. Will ensure an | |
| 592 // allocation region, either by picking one or expanding the | |
| 593 // heap, and then allocate a block of the given size. The block | |
| 594 // may not be a humongous - it must fit into a single heap region. | |
| 595 HeapWord* par_allocate_during_gc(GCAllocPurpose purpose, size_t word_size); | |
| 596 | |
| 597 HeapWord* allocate_during_gc_slow(GCAllocPurpose purpose, | |
| 598 HeapRegion* alloc_region, | |
| 599 bool par, | |
| 600 size_t word_size); | |
| 601 | |
| 602 // Ensure that no further allocations can happen in "r", bearing in mind | |
| 603 // that parallel threads might be attempting allocations. | |
| 604 void par_allocate_remaining_space(HeapRegion* r); | |
| 605 | |
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606 // Allocation attempt during GC for a survivor object / PLAB. |
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607 inline HeapWord* survivor_attempt_allocation(size_t word_size); |
| 545 | 608 |
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609 // Allocation attempt during GC for an old object / PLAB. |
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610 inline HeapWord* old_attempt_allocation(size_t word_size); |
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611 |
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612 // These methods are the "callbacks" from the G1AllocRegion class. |
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613 |
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614 // For mutator alloc regions. |
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615 HeapRegion* new_mutator_alloc_region(size_t word_size, bool force); |
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616 void retire_mutator_alloc_region(HeapRegion* alloc_region, |
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617 size_t allocated_bytes); |
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618 |
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619 // For GC alloc regions. |
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620 HeapRegion* new_gc_alloc_region(size_t word_size, uint count, |
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621 GCAllocPurpose ap); |
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622 void retire_gc_alloc_region(HeapRegion* alloc_region, |
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623 size_t allocated_bytes, GCAllocPurpose ap); |
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624 |
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625 // - if explicit_gc is true, the GC is for a System.gc() or a heap |
| 1973 | 626 // inspection request and should collect the entire heap |
| 627 // - if clear_all_soft_refs is true, all soft references should be | |
| 628 // cleared during the GC | |
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629 // - if explicit_gc is false, word_size describes the allocation that |
| 1973 | 630 // the GC should attempt (at least) to satisfy |
| 631 // - it returns false if it is unable to do the collection due to the | |
| 632 // GC locker being active, true otherwise | |
| 633 bool do_collection(bool explicit_gc, | |
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634 bool clear_all_soft_refs, |
| 342 | 635 size_t word_size); |
| 636 | |
| 637 // Callback from VM_G1CollectFull operation. | |
| 638 // Perform a full collection. | |
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639 virtual void do_full_collection(bool clear_all_soft_refs); |
| 342 | 640 |
| 641 // Resize the heap if necessary after a full collection. If this is | |
| 642 // after a collect-for allocation, "word_size" is the allocation size, | |
| 643 // and will be considered part of the used portion of the heap. | |
| 644 void resize_if_necessary_after_full_collection(size_t word_size); | |
| 645 | |
| 646 // Callback from VM_G1CollectForAllocation operation. | |
| 647 // This function does everything necessary/possible to satisfy a | |
| 648 // failed allocation request (including collection, expansion, etc.) | |
| 1973 | 649 HeapWord* satisfy_failed_allocation(size_t word_size, bool* succeeded); |
| 342 | 650 |
| 651 // Attempting to expand the heap sufficiently | |
| 652 // to support an allocation of the given "word_size". If | |
| 653 // successful, perform the allocation and return the address of the | |
| 654 // allocated block, or else "NULL". | |
| 1973 | 655 HeapWord* expand_and_allocate(size_t word_size); |
| 342 | 656 |
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657 // Process any reference objects discovered during |
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658 // an incremental evacuation pause. |
| 6819 | 659 void process_discovered_references(uint no_of_gc_workers); |
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660 |
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661 // Enqueue any remaining discovered references |
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662 // after processing. |
| 6819 | 663 void enqueue_discovered_references(uint no_of_gc_workers); |
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664 |
| 342 | 665 public: |
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666 |
|
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667 G1MonitoringSupport* g1mm() { |
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668 assert(_g1mm != NULL, "should have been initialized"); |
|
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669 return _g1mm; |
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670 } |
|
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671 |
| 342 | 672 // Expand the garbage-first heap by at least the given size (in bytes!). |
|
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673 // Returns true if the heap was expanded by the requested amount; |
|
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674 // false otherwise. |
| 342 | 675 // (Rounds up to a HeapRegion boundary.) |
|
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676 bool expand(size_t expand_bytes); |
| 342 | 677 |
| 678 // Do anything common to GC's. | |
| 679 virtual void gc_prologue(bool full); | |
| 680 virtual void gc_epilogue(bool full); | |
| 681 | |
| 526 | 682 // We register a region with the fast "in collection set" test. We |
| 683 // simply set to true the array slot corresponding to this region. | |
| 684 void register_region_with_in_cset_fast_test(HeapRegion* r) { | |
| 685 assert(_in_cset_fast_test_base != NULL, "sanity"); | |
| 686 assert(r->in_collection_set(), "invariant"); | |
|
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687 uint index = r->hrs_index(); |
| 3766 | 688 assert(index < _in_cset_fast_test_length, "invariant"); |
| 526 | 689 assert(!_in_cset_fast_test_base[index], "invariant"); |
| 690 _in_cset_fast_test_base[index] = true; | |
| 691 } | |
| 692 | |
| 693 // This is a fast test on whether a reference points into the | |
| 694 // collection set or not. It does not assume that the reference | |
| 695 // points into the heap; if it doesn't, it will return false. | |
| 696 bool in_cset_fast_test(oop obj) { | |
| 697 assert(_in_cset_fast_test != NULL, "sanity"); | |
| 698 if (_g1_committed.contains((HeapWord*) obj)) { | |
| 699 // no need to subtract the bottom of the heap from obj, | |
| 700 // _in_cset_fast_test is biased | |
|
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|
701 uintx index = (uintx) obj >> HeapRegion::LogOfHRGrainBytes; |
| 526 | 702 bool ret = _in_cset_fast_test[index]; |
| 703 // let's make sure the result is consistent with what the slower | |
| 704 // test returns | |
| 705 assert( ret || !obj_in_cs(obj), "sanity"); | |
| 706 assert(!ret || obj_in_cs(obj), "sanity"); | |
| 707 return ret; | |
| 708 } else { | |
| 709 return false; | |
| 710 } | |
| 711 } | |
| 712 | |
|
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|
713 void clear_cset_fast_test() { |
|
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|
714 assert(_in_cset_fast_test_base != NULL, "sanity"); |
|
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|
715 memset(_in_cset_fast_test_base, false, |
|
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|
716 (size_t) _in_cset_fast_test_length * sizeof(bool)); |
|
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717 } |
|
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|
718 |
|
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|
719 // This is called at the start of either a concurrent cycle or a Full |
|
37552638d24a
7172388: G1: _total_full_collections should not be incremented for concurrent cycles
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|
720 // GC to update the number of old marking cycles started. |
|
37552638d24a
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|
721 void increment_old_marking_cycles_started(); |
|
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7172388: G1: _total_full_collections should not be incremented for concurrent cycles
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|
722 |
|
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723 // This is called at the end of either a concurrent cycle or a Full |
|
6120
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|
724 // GC to update the number of old marking cycles completed. Those two |
|
1656
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|
725 // can happen in a nested fashion, i.e., we start a concurrent |
|
4e5661ba9d98
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|
726 // cycle, a Full GC happens half-way through it which ends first, |
|
4e5661ba9d98
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|
727 // and then the cycle notices that a Full GC happened and ends |
|
2030
fb712ff22571
7000559: G1: assertion failure !outer || (full_collections_started == _full_collections_completed + 1)
tonyp
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diff
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|
728 // too. The concurrent parameter is a boolean to help us do a bit |
|
fb712ff22571
7000559: G1: assertion failure !outer || (full_collections_started == _full_collections_completed + 1)
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diff
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|
729 // tighter consistency checking in the method. If concurrent is |
|
fb712ff22571
7000559: G1: assertion failure !outer || (full_collections_started == _full_collections_completed + 1)
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diff
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|
730 // false, the caller is the inner caller in the nesting (i.e., the |
|
fb712ff22571
7000559: G1: assertion failure !outer || (full_collections_started == _full_collections_completed + 1)
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diff
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|
731 // Full GC). If concurrent is true, the caller is the outer caller |
|
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7000559: G1: assertion failure !outer || (full_collections_started == _full_collections_completed + 1)
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diff
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|
732 // in this nesting (i.e., the concurrent cycle). Further nesting is |
|
6120
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diff
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|
733 // not currently supported. The end of this call also notifies |
|
2030
fb712ff22571
7000559: G1: assertion failure !outer || (full_collections_started == _full_collections_completed + 1)
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diff
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|
734 // the FullGCCount_lock in case a Java thread is waiting for a full |
|
fb712ff22571
7000559: G1: assertion failure !outer || (full_collections_started == _full_collections_completed + 1)
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diff
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|
735 // GC to happen (e.g., it called System.gc() with |
|
1656
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|
736 // +ExplicitGCInvokesConcurrent). |
|
6120
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|
737 void increment_old_marking_cycles_completed(bool concurrent); |
|
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|
738 |
|
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|
739 unsigned int old_marking_cycles_completed() { |
|
37552638d24a
7172388: G1: _total_full_collections should not be incremented for concurrent cycles
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|
740 return _old_marking_cycles_completed; |
|
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|
741 } |
|
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|
742 |
|
3778
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7049999: G1: Make the G1PrintHeapRegions output consistent and complete
tonyp
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3777
diff
changeset
|
743 G1HRPrinter* hr_printer() { return &_hr_printer; } |
|
5f6f2615433a
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|
744 |
| 342 | 745 protected: |
| 746 | |
| 747 // Shrink the garbage-first heap by at most the given size (in bytes!). | |
| 748 // (Rounds down to a HeapRegion boundary.) | |
| 749 virtual void shrink(size_t expand_bytes); | |
| 750 void shrink_helper(size_t expand_bytes); | |
| 751 | |
| 1709 | 752 #if TASKQUEUE_STATS |
| 753 static void print_taskqueue_stats_hdr(outputStream* const st = gclog_or_tty); | |
| 754 void print_taskqueue_stats(outputStream* const st = gclog_or_tty) const; | |
| 755 void reset_taskqueue_stats(); | |
| 756 #endif // TASKQUEUE_STATS | |
| 757 | |
| 1973 | 758 // Schedule the VM operation that will do an evacuation pause to |
| 759 // satisfy an allocation request of word_size. *succeeded will | |
| 760 // return whether the VM operation was successful (it did do an | |
| 761 // evacuation pause) or not (another thread beat us to it or the GC | |
| 762 // locker was active). Given that we should not be holding the | |
| 763 // Heap_lock when we enter this method, we will pass the | |
| 764 // gc_count_before (i.e., total_collections()) as a parameter since | |
| 765 // it has to be read while holding the Heap_lock. Currently, both | |
| 766 // methods that call do_collection_pause() release the Heap_lock | |
| 767 // before the call, so it's easy to read gc_count_before just before. | |
| 768 HeapWord* do_collection_pause(size_t word_size, | |
| 769 unsigned int gc_count_before, | |
| 770 bool* succeeded); | |
| 342 | 771 |
| 772 // The guts of the incremental collection pause, executed by the vm | |
| 1973 | 773 // thread. It returns false if it is unable to do the collection due |
| 774 // to the GC locker being active, true otherwise | |
| 775 bool do_collection_pause_at_safepoint(double target_pause_time_ms); | |
| 342 | 776 |
| 777 // Actually do the work of evacuating the collection set. | |
| 1973 | 778 void evacuate_collection_set(); |
| 342 | 779 |
| 780 // The g1 remembered set of the heap. | |
| 781 G1RemSet* _g1_rem_set; | |
| 782 // And it's mod ref barrier set, used to track updates for the above. | |
| 783 ModRefBarrierSet* _mr_bs; | |
| 784 | |
|
616
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6720309: G1: don't synchronously update RSet during evacuation pauses
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parents:
545
diff
changeset
|
785 // A set of cards that cover the objects for which the Rsets should be updated |
|
4f360ec815ba
6720309: G1: don't synchronously update RSet during evacuation pauses
iveresov
parents:
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diff
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|
786 // concurrently after the collection. |
|
4f360ec815ba
6720309: G1: don't synchronously update RSet during evacuation pauses
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parents:
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diff
changeset
|
787 DirtyCardQueueSet _dirty_card_queue_set; |
|
4f360ec815ba
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diff
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|
788 |
| 342 | 789 // The Heap Region Rem Set Iterator. |
| 790 HeapRegionRemSetIterator** _rem_set_iterator; | |
| 791 | |
| 792 // The closure used to refine a single card. | |
| 793 RefineCardTableEntryClosure* _refine_cte_cl; | |
| 794 | |
| 795 // A function to check the consistency of dirty card logs. | |
| 796 void check_ct_logs_at_safepoint(); | |
| 797 | |
| 1705 | 798 // A DirtyCardQueueSet that is used to hold cards that contain |
| 799 // references into the current collection set. This is used to | |
| 800 // update the remembered sets of the regions in the collection | |
| 801 // set in the event of an evacuation failure. | |
| 802 DirtyCardQueueSet _into_cset_dirty_card_queue_set; | |
| 803 | |
| 342 | 804 // After a collection pause, make the regions in the CS into free |
| 805 // regions. | |
| 806 void free_collection_set(HeapRegion* cs_head); | |
| 807 | |
|
1394
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|
808 // Abandon the current collection set without recording policy |
|
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diff
changeset
|
809 // statistics or updating free lists. |
|
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|
810 void abandon_collection_set(HeapRegion* cs_head); |
|
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|
811 |
| 342 | 812 // Applies "scan_non_heap_roots" to roots outside the heap, |
| 813 // "scan_rs" to roots inside the heap (having done "set_region" to | |
|
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|
814 // indicate the region in which the root resides), |
|
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|
815 // and does "scan_metadata" If "scan_rs" is |
| 342 | 816 // NULL, then this step is skipped. The "worker_i" |
| 817 // param is for use with parallel roots processing, and should be | |
| 818 // the "i" of the calling parallel worker thread's work(i) function. | |
| 819 // In the sequential case this param will be ignored. | |
|
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820 void g1_process_strong_roots(bool is_scavenging, |
|
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diff
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|
821 ScanningOption so, |
| 342 | 822 OopClosure* scan_non_heap_roots, |
| 823 OopsInHeapRegionClosure* scan_rs, | |
|
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824 G1KlassScanClosure* scan_klasses, |
| 342 | 825 int worker_i); |
| 826 | |
| 827 // Apply "blk" to all the weak roots of the system. These include | |
| 828 // JNI weak roots, the code cache, system dictionary, symbol table, | |
| 829 // string table, and referents of reachable weak refs. | |
|
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|
830 void g1_process_weak_roots(OopClosure* root_closure); |
| 342 | 831 |
| 2361 | 832 // Frees a non-humongous region by initializing its contents and |
| 2152 | 833 // adding it to the free list that's passed as a parameter (this is |
| 834 // usually a local list which will be appended to the master free | |
| 835 // list later). The used bytes of freed regions are accumulated in | |
| 836 // pre_used. If par is true, the region's RSet will not be freed | |
| 837 // up. The assumption is that this will be done later. | |
| 838 void free_region(HeapRegion* hr, | |
| 839 size_t* pre_used, | |
| 840 FreeRegionList* free_list, | |
| 841 bool par); | |
| 342 | 842 |
| 2361 | 843 // Frees a humongous region by collapsing it into individual regions |
| 844 // and calling free_region() for each of them. The freed regions | |
| 845 // will be added to the free list that's passed as a parameter (this | |
| 846 // is usually a local list which will be appended to the master free | |
| 847 // list later). The used bytes of freed regions are accumulated in | |
| 848 // pre_used. If par is true, the region's RSet will not be freed | |
| 849 // up. The assumption is that this will be done later. | |
| 2152 | 850 void free_humongous_region(HeapRegion* hr, |
| 851 size_t* pre_used, | |
| 852 FreeRegionList* free_list, | |
| 853 HumongousRegionSet* humongous_proxy_set, | |
| 854 bool par); | |
| 342 | 855 |
| 3766 | 856 // Notifies all the necessary spaces that the committed space has |
| 857 // been updated (either expanded or shrunk). It should be called | |
| 858 // after _g1_storage is updated. | |
| 859 void update_committed_space(HeapWord* old_end, HeapWord* new_end); | |
| 860 | |
| 342 | 861 // The concurrent marker (and the thread it runs in.) |
| 862 ConcurrentMark* _cm; | |
| 863 ConcurrentMarkThread* _cmThread; | |
| 864 bool _mark_in_progress; | |
| 865 | |
| 866 // The concurrent refiner. | |
| 867 ConcurrentG1Refine* _cg1r; | |
| 868 | |
| 869 // The parallel task queues | |
| 870 RefToScanQueueSet *_task_queues; | |
| 871 | |
| 872 // True iff a evacuation has failed in the current collection. | |
| 873 bool _evacuation_failed; | |
| 874 | |
| 875 // Set the attribute indicating whether evacuation has failed in the | |
| 876 // current collection. | |
| 877 void set_evacuation_failed(bool b) { _evacuation_failed = b; } | |
| 878 | |
| 879 // Failed evacuations cause some logical from-space objects to have | |
| 880 // forwarding pointers to themselves. Reset them. | |
| 881 void remove_self_forwarding_pointers(); | |
| 882 | |
|
8038
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8002144: G1: large number of evacuation failures may lead to large c heap memory usage
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|
883 // Together, these store an object with a preserved mark, and its mark value. |
|
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|
884 Stack<oop, mtGC> _objs_with_preserved_marks; |
|
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|
885 Stack<markOop, mtGC> _preserved_marks_of_objs; |
| 342 | 886 |
| 887 // Preserve the mark of "obj", if necessary, in preparation for its mark | |
| 888 // word being overwritten with a self-forwarding-pointer. | |
| 889 void preserve_mark_if_necessary(oop obj, markOop m); | |
| 890 | |
| 891 // The stack of evac-failure objects left to be scanned. | |
| 892 GrowableArray<oop>* _evac_failure_scan_stack; | |
| 893 // The closure to apply to evac-failure objects. | |
| 894 | |
| 895 OopsInHeapRegionClosure* _evac_failure_closure; | |
| 896 // Set the field above. | |
| 897 void | |
| 898 set_evac_failure_closure(OopsInHeapRegionClosure* evac_failure_closure) { | |
| 899 _evac_failure_closure = evac_failure_closure; | |
| 900 } | |
| 901 | |
| 902 // Push "obj" on the scan stack. | |
| 903 void push_on_evac_failure_scan_stack(oop obj); | |
| 904 // Process scan stack entries until the stack is empty. | |
| 905 void drain_evac_failure_scan_stack(); | |
| 906 // True iff an invocation of "drain_scan_stack" is in progress; to | |
| 907 // prevent unnecessary recursion. | |
| 908 bool _drain_in_progress; | |
| 909 | |
| 910 // Do any necessary initialization for evacuation-failure handling. | |
| 911 // "cl" is the closure that will be used to process evac-failure | |
| 912 // objects. | |
| 913 void init_for_evac_failure(OopsInHeapRegionClosure* cl); | |
| 914 // Do any necessary cleanup for evacuation-failure handling data | |
| 915 // structures. | |
| 916 void finalize_for_evac_failure(); | |
| 917 | |
| 918 // An attempt to evacuate "obj" has failed; take necessary steps. | |
|
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|
919 oop handle_evacuation_failure_par(OopsInHeapRegionClosure* cl, oop obj); |
| 342 | 920 void handle_evacuation_failure_common(oop obj, markOop m); |
| 921 | |
|
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|
922 #ifndef PRODUCT |
|
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923 // Support for forcing evacuation failures. Analogous to |
|
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|
924 // PromotionFailureALot for the other collectors. |
|
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|
925 |
|
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926 // Records whether G1EvacuationFailureALot should be in effect |
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927 // for the current GC |
|
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928 bool _evacuation_failure_alot_for_current_gc; |
|
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929 |
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930 // Used to record the GC number for interval checking when |
|
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931 // determining whether G1EvaucationFailureALot is in effect |
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932 // for the current GC. |
|
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933 size_t _evacuation_failure_alot_gc_number; |
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934 |
|
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935 // Count of the number of evacuations between failures. |
|
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936 volatile size_t _evacuation_failure_alot_count; |
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937 |
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938 // Set whether G1EvacuationFailureALot should be in effect |
|
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939 // for the current GC (based upon the type of GC and which |
|
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940 // command line flags are set); |
|
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941 inline bool evacuation_failure_alot_for_gc_type(bool gcs_are_young, |
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942 bool during_initial_mark, |
|
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943 bool during_marking); |
|
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944 |
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945 inline void set_evacuation_failure_alot_for_current_gc(); |
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946 |
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947 // Return true if it's time to cause an evacuation failure. |
|
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948 inline bool evacuation_should_fail(); |
|
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949 |
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950 // Reset the G1EvacuationFailureALot counters. Should be called at |
|
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951 // the end of an evacuation pause in which an evacuation failure ocurred. |
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952 inline void reset_evacuation_should_fail(); |
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953 #endif // !PRODUCT |
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954 |
|
3979
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955 // ("Weak") Reference processing support. |
|
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956 // |
|
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957 // G1 has 2 instances of the referece processor class. One |
|
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958 // (_ref_processor_cm) handles reference object discovery |
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959 // and subsequent processing during concurrent marking cycles. |
|
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960 // |
|
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961 // The other (_ref_processor_stw) handles reference object |
|
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962 // discovery and processing during full GCs and incremental |
|
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963 // evacuation pauses. |
|
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964 // |
|
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965 // During an incremental pause, reference discovery will be |
|
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966 // temporarily disabled for _ref_processor_cm and will be |
|
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967 // enabled for _ref_processor_stw. At the end of the evacuation |
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968 // pause references discovered by _ref_processor_stw will be |
|
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969 // processed and discovery will be disabled. The previous |
|
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970 // setting for reference object discovery for _ref_processor_cm |
|
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971 // will be re-instated. |
|
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972 // |
|
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973 // At the start of marking: |
|
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974 // * Discovery by the CM ref processor is verified to be inactive |
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975 // and it's discovered lists are empty. |
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976 // * Discovery by the CM ref processor is then enabled. |
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977 // |
|
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978 // At the end of marking: |
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979 // * Any references on the CM ref processor's discovered |
|
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980 // lists are processed (possibly MT). |
|
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981 // |
|
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982 // At the start of full GC we: |
|
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983 // * Disable discovery by the CM ref processor and |
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984 // empty CM ref processor's discovered lists |
|
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985 // (without processing any entries). |
|
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986 // * Verify that the STW ref processor is inactive and it's |
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987 // discovered lists are empty. |
|
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988 // * Temporarily set STW ref processor discovery as single threaded. |
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989 // * Temporarily clear the STW ref processor's _is_alive_non_header |
|
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990 // field. |
|
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991 // * Finally enable discovery by the STW ref processor. |
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992 // |
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993 // The STW ref processor is used to record any discovered |
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994 // references during the full GC. |
|
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995 // |
|
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996 // At the end of a full GC we: |
|
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997 // * Enqueue any reference objects discovered by the STW ref processor |
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998 // that have non-live referents. This has the side-effect of |
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999 // making the STW ref processor inactive by disabling discovery. |
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1000 // * Verify that the CM ref processor is still inactive |
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1001 // and no references have been placed on it's discovered |
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1002 // lists (also checked as a precondition during initial marking). |
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1003 |
|
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1004 // The (stw) reference processor... |
|
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1005 ReferenceProcessor* _ref_processor_stw; |
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1006 |
|
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1007 // During reference object discovery, the _is_alive_non_header |
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1008 // closure (if non-null) is applied to the referent object to |
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1009 // determine whether the referent is live. If so then the |
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1010 // reference object does not need to be 'discovered' and can |
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1011 // be treated as a regular oop. This has the benefit of reducing |
|
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1012 // the number of 'discovered' reference objects that need to |
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1013 // be processed. |
|
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1014 // |
|
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1015 // Instance of the is_alive closure for embedding into the |
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1016 // STW reference processor as the _is_alive_non_header field. |
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1017 // Supplying a value for the _is_alive_non_header field is |
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1018 // optional but doing so prevents unnecessary additions to |
|
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1019 // the discovered lists during reference discovery. |
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1020 G1STWIsAliveClosure _is_alive_closure_stw; |
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1021 |
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1022 // The (concurrent marking) reference processor... |
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1023 ReferenceProcessor* _ref_processor_cm; |
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1024 |
|
2037
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1025 // Instance of the concurrent mark is_alive closure for embedding |
|
3979
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1026 // into the Concurrent Marking reference processor as the |
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1027 // _is_alive_non_header field. Supplying a value for the |
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1028 // _is_alive_non_header field is optional but doing so prevents |
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1029 // unnecessary additions to the discovered lists during reference |
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1030 // discovery. |
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1031 G1CMIsAliveClosure _is_alive_closure_cm; |
| 342 | 1032 |
|
4709
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1033 // Cache used by G1CollectedHeap::start_cset_region_for_worker(). |
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1034 HeapRegion** _worker_cset_start_region; |
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1035 |
|
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1036 // Time stamp to validate the regions recorded in the cache |
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1037 // used by G1CollectedHeap::start_cset_region_for_worker(). |
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1038 // The heap region entry for a given worker is valid iff |
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1039 // the associated time stamp value matches the current value |
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1040 // of G1CollectedHeap::_gc_time_stamp. |
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1041 unsigned int* _worker_cset_start_region_time_stamp; |
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1042 |
| 342 | 1043 enum G1H_process_strong_roots_tasks { |
|
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|
1044 G1H_PS_filter_satb_buffers, |
| 342 | 1045 G1H_PS_refProcessor_oops_do, |
| 1046 // Leave this one last. | |
| 1047 G1H_PS_NumElements | |
| 1048 }; | |
| 1049 | |
| 1050 SubTasksDone* _process_strong_tasks; | |
| 1051 | |
| 2152 | 1052 volatile bool _free_regions_coming; |
| 342 | 1053 |
| 1054 public: | |
|
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1055 |
|
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1056 SubTasksDone* process_strong_tasks() { return _process_strong_tasks; } |
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1057 |
| 342 | 1058 void set_refine_cte_cl_concurrency(bool concurrent); |
| 1059 | |
| 1709 | 1060 RefToScanQueue *task_queue(int i) const; |
| 342 | 1061 |
|
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1062 // A set of cards where updates happened during the GC |
|
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1063 DirtyCardQueueSet& dirty_card_queue_set() { return _dirty_card_queue_set; } |
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1064 |
| 1705 | 1065 // A DirtyCardQueueSet that is used to hold cards that contain |
| 1066 // references into the current collection set. This is used to | |
| 1067 // update the remembered sets of the regions in the collection | |
| 1068 // set in the event of an evacuation failure. | |
| 1069 DirtyCardQueueSet& into_cset_dirty_card_queue_set() | |
| 1070 { return _into_cset_dirty_card_queue_set; } | |
| 1071 | |
| 342 | 1072 // Create a G1CollectedHeap with the specified policy. |
| 1073 // Must call the initialize method afterwards. | |
| 1074 // May not return if something goes wrong. | |
| 1075 G1CollectedHeap(G1CollectorPolicy* policy); | |
| 1076 | |
| 1077 // Initialize the G1CollectedHeap to have the initial and | |
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1078 // maximum sizes and remembered and barrier sets |
| 342 | 1079 // specified by the policy object. |
| 1080 jint initialize(); | |
| 1081 | |
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1082 // Initialize weak reference processing. |
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1083 virtual void ref_processing_init(); |
| 342 | 1084 |
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1085 void set_par_threads(uint t) { |
| 342 | 1086 SharedHeap::set_par_threads(t); |
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1087 // Done in SharedHeap but oddly there are |
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1088 // two _process_strong_tasks's in a G1CollectedHeap |
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1089 // so do it here too. |
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1090 _process_strong_tasks->set_n_threads(t); |
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1091 } |
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1092 |
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1093 // Set _n_par_threads according to a policy TBD. |
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1094 void set_par_threads(); |
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1095 |
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1096 void set_n_termination(int t) { |
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1097 _process_strong_tasks->set_n_threads(t); |
| 342 | 1098 } |
| 1099 | |
| 1100 virtual CollectedHeap::Name kind() const { | |
| 1101 return CollectedHeap::G1CollectedHeap; | |
| 1102 } | |
| 1103 | |
| 1104 // The current policy object for the collector. | |
| 1105 G1CollectorPolicy* g1_policy() const { return _g1_policy; } | |
| 1106 | |
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1107 virtual CollectorPolicy* collector_policy() const { return (CollectorPolicy*) g1_policy(); } |
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1108 |
| 342 | 1109 // Adaptive size policy. No such thing for g1. |
| 1110 virtual AdaptiveSizePolicy* size_policy() { return NULL; } | |
| 1111 | |
| 1112 // The rem set and barrier set. | |
| 1113 G1RemSet* g1_rem_set() const { return _g1_rem_set; } | |
| 1114 ModRefBarrierSet* mr_bs() const { return _mr_bs; } | |
| 1115 | |
| 1116 // The rem set iterator. | |
| 1117 HeapRegionRemSetIterator* rem_set_iterator(int i) { | |
| 1118 return _rem_set_iterator[i]; | |
| 1119 } | |
| 1120 | |
| 1121 HeapRegionRemSetIterator* rem_set_iterator() { | |
| 1122 return _rem_set_iterator[0]; | |
| 1123 } | |
| 1124 | |
| 1125 unsigned get_gc_time_stamp() { | |
| 1126 return _gc_time_stamp; | |
| 1127 } | |
| 1128 | |
| 1129 void reset_gc_time_stamp() { | |
| 1130 _gc_time_stamp = 0; | |
|
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1131 OrderAccess::fence(); |
|
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1132 // Clear the cached CSet starting regions and time stamps. |
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1133 // Their validity is dependent on the GC timestamp. |
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1134 clear_cset_start_regions(); |
|
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1135 } |
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1136 |
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1137 void check_gc_time_stamps() PRODUCT_RETURN; |
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1138 |
|
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1139 void increment_gc_time_stamp() { |
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1140 ++_gc_time_stamp; |
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1141 OrderAccess::fence(); |
| 342 | 1142 } |
| 1143 | |
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1144 // Reset the given region's GC timestamp. If it's starts humongous, |
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1145 // also reset the GC timestamp of its corresponding |
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1146 // continues humongous regions too. |
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1147 void reset_gc_time_stamps(HeapRegion* hr); |
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1148 |
| 1705 | 1149 void iterate_dirty_card_closure(CardTableEntryClosure* cl, |
| 1150 DirtyCardQueue* into_cset_dcq, | |
| 1151 bool concurrent, int worker_i); | |
| 342 | 1152 |
| 1153 // The shared block offset table array. | |
| 1154 G1BlockOffsetSharedArray* bot_shared() const { return _bot_shared; } | |
| 1155 | |
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1156 // Reference Processing accessors |
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1157 |
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1158 // The STW reference processor.... |
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1159 ReferenceProcessor* ref_processor_stw() const { return _ref_processor_stw; } |
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1160 |
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1161 // The Concurent Marking reference processor... |
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1162 ReferenceProcessor* ref_processor_cm() const { return _ref_processor_cm; } |
| 342 | 1163 |
| 1164 virtual size_t capacity() const; | |
| 1165 virtual size_t used() const; | |
|
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1166 // This should be called when we're not holding the heap lock. The |
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1167 // result might be a bit inaccurate. |
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1168 size_t used_unlocked() const; |
| 342 | 1169 size_t recalculate_used() const; |
| 1170 | |
| 1171 // These virtual functions do the actual allocation. | |
| 1172 // Some heaps may offer a contiguous region for shared non-blocking | |
| 1173 // allocation, via inlined code (by exporting the address of the top and | |
| 1174 // end fields defining the extent of the contiguous allocation region.) | |
| 1175 // But G1CollectedHeap doesn't yet support this. | |
| 1176 | |
| 1177 // Return an estimate of the maximum allocation that could be performed | |
| 1178 // without triggering any collection or expansion activity. In a | |
| 1179 // generational collector, for example, this is probably the largest | |
| 1180 // allocation that could be supported (without expansion) in the youngest | |
| 1181 // generation. It is "unsafe" because no locks are taken; the result | |
| 1182 // should be treated as an approximation, not a guarantee, for use in | |
| 1183 // heuristic resizing decisions. | |
| 1184 virtual size_t unsafe_max_alloc(); | |
| 1185 | |
| 1186 virtual bool is_maximal_no_gc() const { | |
| 1187 return _g1_storage.uncommitted_size() == 0; | |
| 1188 } | |
| 1189 | |
| 1190 // The total number of regions in the heap. | |
|
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1191 uint n_regions() { return _hrs.length(); } |
| 3766 | 1192 |
| 1193 // The max number of regions in the heap. | |
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1194 uint max_regions() { return _hrs.max_length(); } |
| 342 | 1195 |
| 1196 // The number of regions that are completely free. | |
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1197 uint free_regions() { return _free_list.length(); } |
| 342 | 1198 |
| 1199 // The number of regions that are not completely free. | |
|
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1200 uint used_regions() { return n_regions() - free_regions(); } |
| 342 | 1201 |
| 1202 // The number of regions available for "regular" expansion. | |
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1203 uint expansion_regions() { return _expansion_regions; } |
| 342 | 1204 |
| 3766 | 1205 // Factory method for HeapRegion instances. It will return NULL if |
| 1206 // the allocation fails. | |
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1207 HeapRegion* new_heap_region(uint hrs_index, HeapWord* bottom); |
| 3766 | 1208 |
|
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1209 void verify_not_dirty_region(HeapRegion* hr) PRODUCT_RETURN; |
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1210 void verify_dirty_region(HeapRegion* hr) PRODUCT_RETURN; |
|
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1211 void verify_dirty_young_list(HeapRegion* head) PRODUCT_RETURN; |
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1212 void verify_dirty_young_regions() PRODUCT_RETURN; |
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1213 |
| 2152 | 1214 // verify_region_sets() performs verification over the region |
| 1215 // lists. It will be compiled in the product code to be used when | |
| 1216 // necessary (i.e., during heap verification). | |
| 1217 void verify_region_sets(); | |
| 342 | 1218 |
| 2152 | 1219 // verify_region_sets_optional() is planted in the code for |
| 1220 // list verification in non-product builds (and it can be enabled in | |
| 1221 // product builds by definning HEAP_REGION_SET_FORCE_VERIFY to be 1). | |
| 1222 #if HEAP_REGION_SET_FORCE_VERIFY | |
| 1223 void verify_region_sets_optional() { | |
| 1224 verify_region_sets(); | |
| 1225 } | |
| 1226 #else // HEAP_REGION_SET_FORCE_VERIFY | |
| 1227 void verify_region_sets_optional() { } | |
| 1228 #endif // HEAP_REGION_SET_FORCE_VERIFY | |
| 342 | 1229 |
| 2152 | 1230 #ifdef ASSERT |
| 2361 | 1231 bool is_on_master_free_list(HeapRegion* hr) { |
| 2152 | 1232 return hr->containing_set() == &_free_list; |
| 1233 } | |
| 342 | 1234 |
| 2361 | 1235 bool is_in_humongous_set(HeapRegion* hr) { |
| 2152 | 1236 return hr->containing_set() == &_humongous_set; |
| 2361 | 1237 } |
| 2152 | 1238 #endif // ASSERT |
| 342 | 1239 |
| 2152 | 1240 // Wrapper for the region list operations that can be called from |
| 1241 // methods outside this class. | |
| 342 | 1242 |
| 2152 | 1243 void secondary_free_list_add_as_tail(FreeRegionList* list) { |
| 1244 _secondary_free_list.add_as_tail(list); | |
| 1245 } | |
| 342 | 1246 |
| 2152 | 1247 void append_secondary_free_list() { |
|
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1248 _free_list.add_as_head(&_secondary_free_list); |
| 2152 | 1249 } |
| 342 | 1250 |
| 2361 | 1251 void append_secondary_free_list_if_not_empty_with_lock() { |
| 1252 // If the secondary free list looks empty there's no reason to | |
| 1253 // take the lock and then try to append it. | |
| 2152 | 1254 if (!_secondary_free_list.is_empty()) { |
| 1255 MutexLockerEx x(SecondaryFreeList_lock, Mutex::_no_safepoint_check_flag); | |
| 1256 append_secondary_free_list(); | |
| 1257 } | |
| 1258 } | |
| 342 | 1259 |
| 4072 | 1260 void old_set_remove(HeapRegion* hr) { |
| 1261 _old_set.remove(hr); | |
| 1262 } | |
| 1263 | |
|
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1264 size_t non_young_capacity_bytes() { |
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1265 return _old_set.total_capacity_bytes() + _humongous_set.total_capacity_bytes(); |
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1266 } |
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1267 |
| 2152 | 1268 void set_free_regions_coming(); |
| 1269 void reset_free_regions_coming(); | |
| 1270 bool free_regions_coming() { return _free_regions_coming; } | |
| 1271 void wait_while_free_regions_coming(); | |
| 342 | 1272 |
|
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1273 // Determine whether the given region is one that we are using as an |
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1274 // old GC alloc region. |
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1275 bool is_old_gc_alloc_region(HeapRegion* hr) { |
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1276 return hr == _retained_old_gc_alloc_region; |
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1277 } |
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1278 |
| 342 | 1279 // Perform a collection of the heap; intended for use in implementing |
| 1280 // "System.gc". This probably implies as full a collection as the | |
| 1281 // "CollectedHeap" supports. | |
| 1282 virtual void collect(GCCause::Cause cause); | |
| 1283 | |
| 1284 // The same as above but assume that the caller holds the Heap_lock. | |
| 1285 void collect_locked(GCCause::Cause cause); | |
| 1286 | |
| 1287 // True iff a evacuation has failed in the most-recent collection. | |
| 1288 bool evacuation_failed() { return _evacuation_failed; } | |
| 1289 | |
| 2152 | 1290 // It will free a region if it has allocated objects in it that are |
| 1291 // all dead. It calls either free_region() or | |
| 1292 // free_humongous_region() depending on the type of the region that | |
| 1293 // is passed to it. | |
| 2173 | 1294 void free_region_if_empty(HeapRegion* hr, |
| 1295 size_t* pre_used, | |
| 1296 FreeRegionList* free_list, | |
| 4072 | 1297 OldRegionSet* old_proxy_set, |
| 2173 | 1298 HumongousRegionSet* humongous_proxy_set, |
| 1299 HRRSCleanupTask* hrrs_cleanup_task, | |
| 1300 bool par); | |
| 342 | 1301 |
| 2152 | 1302 // It appends the free list to the master free list and updates the |
| 1303 // master humongous list according to the contents of the proxy | |
| 1304 // list. It also adjusts the total used bytes according to pre_used | |
| 1305 // (if par is true, it will do so by taking the ParGCRareEvent_lock). | |
| 1306 void update_sets_after_freeing_regions(size_t pre_used, | |
| 1307 FreeRegionList* free_list, | |
| 4072 | 1308 OldRegionSet* old_proxy_set, |
| 2152 | 1309 HumongousRegionSet* humongous_proxy_set, |
| 1310 bool par); | |
| 342 | 1311 |
| 4708 | 1312 // Returns "TRUE" iff "p" points into the committed areas of the heap. |
| 342 | 1313 virtual bool is_in(const void* p) const; |
| 1314 | |
| 1315 // Return "TRUE" iff the given object address is within the collection | |
| 1316 // set. | |
| 1317 inline bool obj_in_cs(oop obj); | |
| 1318 | |
| 1319 // Return "TRUE" iff the given object address is in the reserved | |
|
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1320 // region of g1. |
| 342 | 1321 bool is_in_g1_reserved(const void* p) const { |
| 1322 return _g1_reserved.contains(p); | |
| 1323 } | |
| 1324 | |
|
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1325 // Returns a MemRegion that corresponds to the space that has been |
|
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1326 // reserved for the heap |
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1327 MemRegion g1_reserved() { |
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1328 return _g1_reserved; |
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1329 } |
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1330 |
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|
1331 // Returns a MemRegion that corresponds to the space that has been |
| 342 | 1332 // committed in the heap |
| 1333 MemRegion g1_committed() { | |
| 1334 return _g1_committed; | |
| 1335 } | |
| 1336 | |
| 2311 | 1337 virtual bool is_in_closed_subset(const void* p) const; |
| 342 | 1338 |
| 1339 // This resets the card table to all zeros. It is used after | |
| 1340 // a collection pause which used the card table to claim cards. | |
| 1341 void cleanUpCardTable(); | |
| 1342 | |
| 1343 // Iteration functions. | |
| 1344 | |
| 1345 // Iterate over all the ref-containing fields of all objects, calling | |
| 1346 // "cl.do_oop" on each. | |
|
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1347 virtual void oop_iterate(ExtendedOopClosure* cl); |
| 342 | 1348 |
| 1349 // Same as above, restricted to a memory region. | |
|
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1350 void oop_iterate(MemRegion mr, ExtendedOopClosure* cl); |
| 342 | 1351 |
| 1352 // Iterate over all objects, calling "cl.do_object" on each. | |
|
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1353 virtual void object_iterate(ObjectClosure* cl); |
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1354 |
| 678 | 1355 virtual void safe_object_iterate(ObjectClosure* cl) { |
|
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1356 object_iterate(cl); |
| 678 | 1357 } |
| 342 | 1358 |
| 1359 // Iterate over all objects allocated since the last collection, calling | |
| 1360 // "cl.do_object" on each. The heap must have been initialized properly | |
| 1361 // to support this function, or else this call will fail. | |
| 1362 virtual void object_iterate_since_last_GC(ObjectClosure* cl); | |
| 1363 | |
| 1364 // Iterate over all spaces in use in the heap, in ascending address order. | |
| 1365 virtual void space_iterate(SpaceClosure* cl); | |
| 1366 | |
| 1367 // Iterate over heap regions, in address order, terminating the | |
| 1368 // iteration early if the "doHeapRegion" method returns "true". | |
| 3766 | 1369 void heap_region_iterate(HeapRegionClosure* blk) const; |
| 342 | 1370 |
| 3766 | 1371 // Return the region with the given index. It assumes the index is valid. |
|
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1372 HeapRegion* region_at(uint index) const { return _hrs.at(index); } |
| 342 | 1373 |
| 1374 // Divide the heap region sequence into "chunks" of some size (the number | |
| 1375 // of regions divided by the number of parallel threads times some | |
| 1376 // overpartition factor, currently 4). Assumes that this will be called | |
| 1377 // in parallel by ParallelGCThreads worker threads with discinct worker | |
| 1378 // ids in the range [0..max(ParallelGCThreads-1, 1)], that all parallel | |
| 1379 // calls will use the same "claim_value", and that that claim value is | |
| 1380 // different from the claim_value of any heap region before the start of | |
| 1381 // the iteration. Applies "blk->doHeapRegion" to each of the regions, by | |
| 1382 // attempting to claim the first region in each chunk, and, if | |
| 1383 // successful, applying the closure to each region in the chunk (and | |
| 1384 // setting the claim value of the second and subsequent regions of the | |
| 1385 // chunk.) For now requires that "doHeapRegion" always returns "false", | |
| 1386 // i.e., that a closure never attempt to abort a traversal. | |
| 1387 void heap_region_par_iterate_chunked(HeapRegionClosure* blk, | |
|
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1388 uint worker, |
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1389 uint no_of_par_workers, |
| 342 | 1390 jint claim_value); |
| 1391 | |
| 390 | 1392 // It resets all the region claim values to the default. |
| 1393 void reset_heap_region_claim_values(); | |
| 1394 | |
|
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1395 // Resets the claim values of regions in the current |
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1396 // collection set to the default. |
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1397 void reset_cset_heap_region_claim_values(); |
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1398 |
| 355 | 1399 #ifdef ASSERT |
| 1400 bool check_heap_region_claim_values(jint claim_value); | |
|
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1401 |
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1402 // Same as the routine above but only checks regions in the |
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1403 // current collection set. |
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1404 bool check_cset_heap_region_claim_values(jint claim_value); |
| 355 | 1405 #endif // ASSERT |
| 1406 | |
|
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1407 // Clear the cached cset start regions and (more importantly) |
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1408 // the time stamps. Called when we reset the GC time stamp. |
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1409 void clear_cset_start_regions(); |
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1410 |
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1411 // Given the id of a worker, obtain or calculate a suitable |
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1412 // starting region for iterating over the current collection set. |
|
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1413 HeapRegion* start_cset_region_for_worker(int worker_i); |
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1414 |
|
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1415 // This is a convenience method that is used by the |
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1416 // HeapRegionIterator classes to calculate the starting region for |
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1417 // each worker so that they do not all start from the same region. |
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1418 HeapRegion* start_region_for_worker(uint worker_i, uint no_of_par_workers); |
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1419 |
| 342 | 1420 // Iterate over the regions (if any) in the current collection set. |
| 1421 void collection_set_iterate(HeapRegionClosure* blk); | |
| 1422 | |
| 1423 // As above but starting from region r | |
| 1424 void collection_set_iterate_from(HeapRegion* r, HeapRegionClosure *blk); | |
| 1425 | |
| 1426 // Returns the first (lowest address) compactible space in the heap. | |
| 1427 virtual CompactibleSpace* first_compactible_space(); | |
| 1428 | |
| 1429 // A CollectedHeap will contain some number of spaces. This finds the | |
| 1430 // space containing a given address, or else returns NULL. | |
| 1431 virtual Space* space_containing(const void* addr) const; | |
| 1432 | |
| 1433 // A G1CollectedHeap will contain some number of heap regions. This | |
| 1434 // finds the region containing a given address, or else returns NULL. | |
| 3766 | 1435 template <class T> |
| 1436 inline HeapRegion* heap_region_containing(const T addr) const; | |
| 342 | 1437 |
| 1438 // Like the above, but requires "addr" to be in the heap (to avoid a | |
| 1439 // null-check), and unlike the above, may return an continuing humongous | |
| 1440 // region. | |
| 3766 | 1441 template <class T> |
| 1442 inline HeapRegion* heap_region_containing_raw(const T addr) const; | |
| 342 | 1443 |
| 1444 // A CollectedHeap is divided into a dense sequence of "blocks"; that is, | |
| 1445 // each address in the (reserved) heap is a member of exactly | |
| 1446 // one block. The defining characteristic of a block is that it is | |
| 1447 // possible to find its size, and thus to progress forward to the next | |
| 1448 // block. (Blocks may be of different sizes.) Thus, blocks may | |
| 1449 // represent Java objects, or they might be free blocks in a | |
| 1450 // free-list-based heap (or subheap), as long as the two kinds are | |
| 1451 // distinguishable and the size of each is determinable. | |
| 1452 | |
| 1453 // Returns the address of the start of the "block" that contains the | |
| 1454 // address "addr". We say "blocks" instead of "object" since some heaps | |
| 1455 // may not pack objects densely; a chunk may either be an object or a | |
| 1456 // non-object. | |
| 1457 virtual HeapWord* block_start(const void* addr) const; | |
| 1458 | |
| 1459 // Requires "addr" to be the start of a chunk, and returns its size. | |
| 1460 // "addr + size" is required to be the start of a new chunk, or the end | |
| 1461 // of the active area of the heap. | |
| 1462 virtual size_t block_size(const HeapWord* addr) const; | |
| 1463 | |
| 1464 // Requires "addr" to be the start of a block, and returns "TRUE" iff | |
| 1465 // the block is an object. | |
| 1466 virtual bool block_is_obj(const HeapWord* addr) const; | |
| 1467 | |
| 1468 // Does this heap support heap inspection? (+PrintClassHistogram) | |
| 1469 virtual bool supports_heap_inspection() const { return true; } | |
| 1470 | |
| 1471 // Section on thread-local allocation buffers (TLABs) | |
| 1472 // See CollectedHeap for semantics. | |
| 1473 | |
| 1474 virtual bool supports_tlab_allocation() const; | |
| 1475 virtual size_t tlab_capacity(Thread* thr) const; | |
| 1476 virtual size_t unsafe_max_tlab_alloc(Thread* thr) const; | |
| 1477 | |
| 1478 // Can a compiler initialize a new object without store barriers? | |
| 1479 // This permission only extends from the creation of a new object | |
|
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1480 // via a TLAB up to the first subsequent safepoint. If such permission |
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1481 // is granted for this heap type, the compiler promises to call |
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1482 // defer_store_barrier() below on any slow path allocation of |
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1483 // a new object for which such initializing store barriers will |
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1484 // have been elided. G1, like CMS, allows this, but should be |
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1485 // ready to provide a compensating write barrier as necessary |
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1486 // if that storage came out of a non-young region. The efficiency |
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1487 // of this implementation depends crucially on being able to |
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1488 // answer very efficiently in constant time whether a piece of |
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1489 // storage in the heap comes from a young region or not. |
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|
1490 // See ReduceInitialCardMarks. |
| 342 | 1491 virtual bool can_elide_tlab_store_barriers() const { |
|
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1492 return true; |
|
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1493 } |
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|
1494 |
| 1166 | 1495 virtual bool card_mark_must_follow_store() const { |
| 1496 return true; | |
| 1497 } | |
| 1498 | |
| 3766 | 1499 bool is_in_young(const oop obj) { |
|
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1500 HeapRegion* hr = heap_region_containing(obj); |
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1501 return hr != NULL && hr->is_young(); |
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1502 } |
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1503 |
|
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1504 #ifdef ASSERT |
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1505 virtual bool is_in_partial_collection(const void* p); |
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1506 #endif |
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1507 |
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1508 virtual bool is_scavengable(const void* addr); |
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1509 |
|
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1510 // We don't need barriers for initializing stores to objects |
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1511 // in the young gen: for the SATB pre-barrier, there is no |
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1512 // pre-value that needs to be remembered; for the remembered-set |
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1513 // update logging post-barrier, we don't maintain remembered set |
|
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1514 // information for young gen objects. |
|
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1515 virtual bool can_elide_initializing_store_barrier(oop new_obj) { |
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1516 return is_in_young(new_obj); |
| 342 | 1517 } |
| 1518 | |
| 1519 // Returns "true" iff the given word_size is "very large". | |
| 1520 static bool isHumongous(size_t word_size) { | |
|
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1521 // Note this has to be strictly greater-than as the TLABs |
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1522 // are capped at the humongous thresold and we want to |
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1523 // ensure that we don't try to allocate a TLAB as |
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1524 // humongous and that we don't allocate a humongous |
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1525 // object in a TLAB. |
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1526 return word_size > _humongous_object_threshold_in_words; |
| 342 | 1527 } |
| 1528 | |
| 1529 // Update mod union table with the set of dirty cards. | |
| 1530 void updateModUnion(); | |
| 1531 | |
| 1532 // Set the mod union bits corresponding to the given memRegion. Note | |
| 1533 // that this is always a safe operation, since it doesn't clear any | |
| 1534 // bits. | |
| 1535 void markModUnionRange(MemRegion mr); | |
| 1536 | |
| 1537 // Records the fact that a marking phase is no longer in progress. | |
| 1538 void set_marking_complete() { | |
| 1539 _mark_in_progress = false; | |
| 1540 } | |
| 1541 void set_marking_started() { | |
| 1542 _mark_in_progress = true; | |
| 1543 } | |
| 1544 bool mark_in_progress() { | |
| 1545 return _mark_in_progress; | |
| 1546 } | |
| 1547 | |
| 1548 // Print the maximum heap capacity. | |
| 1549 virtual size_t max_capacity() const; | |
| 1550 | |
| 1551 virtual jlong millis_since_last_gc(); | |
| 1552 | |
| 1553 // Perform any cleanup actions necessary before allowing a verification. | |
| 1554 virtual void prepare_for_verify(); | |
| 1555 | |
| 1556 // Perform verification. | |
| 811 | 1557 |
|
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1558 // vo == UsePrevMarking -> use "prev" marking information, |
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1559 // vo == UseNextMarking -> use "next" marking information |
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1560 // vo == UseMarkWord -> use the mark word in the object header |
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|
1561 // |
| 811 | 1562 // NOTE: Only the "prev" marking information is guaranteed to be |
| 1563 // consistent most of the time, so most calls to this should use | |
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1564 // vo == UsePrevMarking. |
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1565 // Currently, there is only one case where this is called with |
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1566 // vo == UseNextMarking, which is to verify the "next" marking |
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1567 // information at the end of remark. |
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1568 // Currently there is only one place where this is called with |
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1569 // vo == UseMarkWord, which is to verify the marking during a |
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1570 // full GC. |
| 6008 | 1571 void verify(bool silent, VerifyOption vo); |
| 811 | 1572 |
| 1573 // Override; it uses the "prev" marking information | |
| 6008 | 1574 virtual void verify(bool silent); |
| 342 | 1575 virtual void print_on(outputStream* st) const; |
|
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1576 virtual void print_extended_on(outputStream* st) const; |
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1577 virtual void print_on_error(outputStream* st) const; |
| 342 | 1578 |
| 1579 virtual void print_gc_threads_on(outputStream* st) const; | |
| 1580 virtual void gc_threads_do(ThreadClosure* tc) const; | |
| 1581 | |
| 1582 // Override | |
| 1583 void print_tracing_info() const; | |
| 1584 | |
|
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1585 // The following two methods are helpful for debugging RSet issues. |
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1586 void print_cset_rsets() PRODUCT_RETURN; |
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1587 void print_all_rsets() PRODUCT_RETURN; |
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1588 |
| 342 | 1589 // Convenience function to be used in situations where the heap type can be |
| 1590 // asserted to be this type. | |
| 1591 static G1CollectedHeap* heap(); | |
| 1592 | |
| 1593 void set_region_short_lived_locked(HeapRegion* hr); | |
| 1594 // add appropriate methods for any other surv rate groups | |
| 1595 | |
|
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1596 YoungList* young_list() { return _young_list; } |
| 342 | 1597 |
| 1598 // debugging | |
| 1599 bool check_young_list_well_formed() { | |
| 1600 return _young_list->check_list_well_formed(); | |
| 1601 } | |
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1602 |
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1603 bool check_young_list_empty(bool check_heap, |
| 342 | 1604 bool check_sample = true); |
| 1605 | |
| 1606 // *** Stuff related to concurrent marking. It's not clear to me that so | |
| 1607 // many of these need to be public. | |
| 1608 | |
| 1609 // The functions below are helper functions that a subclass of | |
| 1610 // "CollectedHeap" can use in the implementation of its virtual | |
| 1611 // functions. | |
| 1612 // This performs a concurrent marking of the live objects in a | |
| 1613 // bitmap off to the side. | |
| 1614 void doConcurrentMark(); | |
| 1615 | |
| 1616 bool isMarkedPrev(oop obj) const; | |
| 1617 bool isMarkedNext(oop obj) const; | |
| 1618 | |
| 1619 // Determine if an object is dead, given the object and also | |
| 1620 // the region to which the object belongs. An object is dead | |
| 1621 // iff a) it was not allocated since the last mark and b) it | |
| 1622 // is not marked. | |
| 1623 | |
| 1624 bool is_obj_dead(const oop obj, const HeapRegion* hr) const { | |
| 1625 return | |
| 1626 !hr->obj_allocated_since_prev_marking(obj) && | |
| 1627 !isMarkedPrev(obj); | |
| 1628 } | |
| 1629 | |
| 1630 // This function returns true when an object has been | |
| 1631 // around since the previous marking and hasn't yet | |
| 1632 // been marked during this marking. | |
| 1633 | |
| 1634 bool is_obj_ill(const oop obj, const HeapRegion* hr) const { | |
| 1635 return | |
| 1636 !hr->obj_allocated_since_next_marking(obj) && | |
| 1637 !isMarkedNext(obj); | |
| 1638 } | |
| 1639 | |
| 1640 // Determine if an object is dead, given only the object itself. | |
| 1641 // This will find the region to which the object belongs and | |
| 1642 // then call the region version of the same function. | |
| 1643 | |
| 1644 // Added if it is NULL it isn't dead. | |
| 1645 | |
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1646 bool is_obj_dead(const oop obj) const { |
| 811 | 1647 const HeapRegion* hr = heap_region_containing(obj); |
| 342 | 1648 if (hr == NULL) { |
|
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1649 if (obj == NULL) return false; |
| 342 | 1650 else return true; |
| 1651 } | |
| 1652 else return is_obj_dead(obj, hr); | |
| 1653 } | |
| 1654 | |
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1655 bool is_obj_ill(const oop obj) const { |
| 811 | 1656 const HeapRegion* hr = heap_region_containing(obj); |
| 342 | 1657 if (hr == NULL) { |
|
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1658 if (obj == NULL) return false; |
| 342 | 1659 else return true; |
| 1660 } | |
| 1661 else return is_obj_ill(obj, hr); | |
| 1662 } | |
| 1663 | |
|
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1664 // The methods below are here for convenience and dispatch the |
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1665 // appropriate method depending on value of the given VerifyOption |
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1666 // parameter. The options for that parameter are: |
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1667 // |
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1668 // vo == UsePrevMarking -> use "prev" marking information, |
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1669 // vo == UseNextMarking -> use "next" marking information, |
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1670 // vo == UseMarkWord -> use mark word from object header |
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1671 |
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1672 bool is_obj_dead_cond(const oop obj, |
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1673 const HeapRegion* hr, |
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1674 const VerifyOption vo) const { |
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1675 switch (vo) { |
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1676 case VerifyOption_G1UsePrevMarking: return is_obj_dead(obj, hr); |
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1677 case VerifyOption_G1UseNextMarking: return is_obj_ill(obj, hr); |
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1678 case VerifyOption_G1UseMarkWord: return !obj->is_gc_marked(); |
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|
1679 default: ShouldNotReachHere(); |
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|
1680 } |
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|
1681 return false; // keep some compilers happy |
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|
1682 } |
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|
1683 |
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1684 bool is_obj_dead_cond(const oop obj, |
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1685 const VerifyOption vo) const { |
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1686 switch (vo) { |
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1687 case VerifyOption_G1UsePrevMarking: return is_obj_dead(obj); |
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1688 case VerifyOption_G1UseNextMarking: return is_obj_ill(obj); |
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1689 case VerifyOption_G1UseMarkWord: return !obj->is_gc_marked(); |
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1690 default: ShouldNotReachHere(); |
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|
1691 } |
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|
1692 return false; // keep some compilers happy |
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|
1693 } |
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|
1694 |
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|
1695 bool allocated_since_marking(oop obj, HeapRegion* hr, VerifyOption vo); |
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|
1696 HeapWord* top_at_mark_start(HeapRegion* hr, VerifyOption vo); |
|
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|
1697 bool is_marked(oop obj, VerifyOption vo); |
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|
1698 const char* top_at_mark_start_str(VerifyOption vo); |
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|
1699 |
| 342 | 1700 // The following is just to alert the verification code |
| 1701 // that a full collection has occurred and that the | |
| 1702 // remembered sets are no longer up to date. | |
| 1703 bool _full_collection; | |
| 1704 void set_full_collection() { _full_collection = true;} | |
| 1705 void clear_full_collection() {_full_collection = false;} | |
| 1706 bool full_collection() {return _full_collection;} | |
| 1707 | |
| 1708 ConcurrentMark* concurrent_mark() const { return _cm; } | |
| 1709 ConcurrentG1Refine* concurrent_g1_refine() const { return _cg1r; } | |
| 1710 | |
|
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|
1711 // The dirty cards region list is used to record a subset of regions |
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|
1712 // whose cards need clearing. The list if populated during the |
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1713 // remembered set scanning and drained during the card table |
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|
1714 // cleanup. Although the methods are reentrant, population/draining |
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|
1715 // phases must not overlap. For synchronization purposes the last |
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1716 // element on the list points to itself. |
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|
1717 HeapRegion* _dirty_cards_region_list; |
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|
1718 void push_dirty_cards_region(HeapRegion* hr); |
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|
1719 HeapRegion* pop_dirty_cards_region(); |
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|
1720 |
| 342 | 1721 public: |
| 1722 void stop_conc_gc_threads(); | |
| 1723 | |
| 1724 size_t pending_card_num(); | |
| 1725 size_t cards_scanned(); | |
| 1726 | |
| 1727 protected: | |
| 1728 size_t _max_heap_capacity; | |
| 1729 }; | |
| 1730 | |
|
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1731 class G1ParGCAllocBuffer: public ParGCAllocBuffer { |
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1732 private: |
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|
1733 bool _retired; |
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|
1734 |
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|
1735 public: |
|
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|
1736 G1ParGCAllocBuffer(size_t gclab_word_size); |
|
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|
1737 |
|
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|
1738 void set_buf(HeapWord* buf) { |
|
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|
1739 ParGCAllocBuffer::set_buf(buf); |
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|
1740 _retired = false; |
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|
1741 } |
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|
1742 |
|
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|
1743 void retire(bool end_of_gc, bool retain) { |
|
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1744 if (_retired) |
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|
1745 return; |
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|
1746 ParGCAllocBuffer::retire(end_of_gc, retain); |
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|
1747 _retired = true; |
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|
1748 } |
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|
1749 }; |
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|
1750 |
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|
1751 class G1ParScanThreadState : public StackObj { |
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|
1752 protected: |
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|
1753 G1CollectedHeap* _g1h; |
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|
1754 RefToScanQueue* _refs; |
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|
1755 DirtyCardQueue _dcq; |
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|
1756 CardTableModRefBS* _ct_bs; |
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|
1757 G1RemSet* _g1_rem; |
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|
1758 |
|
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|
1759 G1ParGCAllocBuffer _surviving_alloc_buffer; |
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|
1760 G1ParGCAllocBuffer _tenured_alloc_buffer; |
|
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1761 G1ParGCAllocBuffer* _alloc_buffers[GCAllocPurposeCount]; |
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1762 ageTable _age_table; |
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1763 |
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1764 size_t _alloc_buffer_waste; |
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1765 size_t _undo_waste; |
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1766 |
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1767 OopsInHeapRegionClosure* _evac_failure_cl; |
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1768 G1ParScanHeapEvacClosure* _evac_cl; |
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1769 G1ParScanPartialArrayClosure* _partial_scan_cl; |
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1770 |
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1771 int _hash_seed; |
|
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1772 uint _queue_num; |
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1773 |
| 1611 | 1774 size_t _term_attempts; |
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1775 |
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1776 double _start; |
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1777 double _start_strong_roots; |
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1778 double _strong_roots_time; |
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1779 double _start_term; |
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1780 double _term_time; |
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1781 |
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1782 // Map from young-age-index (0 == not young, 1 is youngest) to |
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1783 // surviving words. base is what we get back from the malloc call |
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1784 size_t* _surviving_young_words_base; |
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1785 // this points into the array, as we use the first few entries for padding |
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1786 size_t* _surviving_young_words; |
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1787 |
| 1709 | 1788 #define PADDING_ELEM_NUM (DEFAULT_CACHE_LINE_SIZE / sizeof(size_t)) |
|
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1789 |
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1790 void add_to_alloc_buffer_waste(size_t waste) { _alloc_buffer_waste += waste; } |
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1791 |
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1792 void add_to_undo_waste(size_t waste) { _undo_waste += waste; } |
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1793 |
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1794 DirtyCardQueue& dirty_card_queue() { return _dcq; } |
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1795 CardTableModRefBS* ctbs() { return _ct_bs; } |
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1796 |
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1797 template <class T> void immediate_rs_update(HeapRegion* from, T* p, int tid) { |
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1798 if (!from->is_survivor()) { |
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1799 _g1_rem->par_write_ref(from, p, tid); |
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1800 } |
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1801 } |
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1802 |
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1803 template <class T> void deferred_rs_update(HeapRegion* from, T* p, int tid) { |
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1804 // If the new value of the field points to the same region or |
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1805 // is the to-space, we don't need to include it in the Rset updates. |
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1806 if (!from->is_in_reserved(oopDesc::load_decode_heap_oop(p)) && !from->is_survivor()) { |
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1807 size_t card_index = ctbs()->index_for(p); |
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1808 // If the card hasn't been added to the buffer, do it. |
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1809 if (ctbs()->mark_card_deferred(card_index)) { |
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1810 dirty_card_queue().enqueue((jbyte*)ctbs()->byte_for_index(card_index)); |
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1811 } |
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1812 } |
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1813 } |
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1814 |
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1815 public: |
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1816 G1ParScanThreadState(G1CollectedHeap* g1h, uint queue_num); |
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1817 |
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1818 ~G1ParScanThreadState() { |
| 6197 | 1819 FREE_C_HEAP_ARRAY(size_t, _surviving_young_words_base, mtGC); |
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1820 } |
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1821 |
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1822 RefToScanQueue* refs() { return _refs; } |
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1823 ageTable* age_table() { return &_age_table; } |
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1824 |
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1825 G1ParGCAllocBuffer* alloc_buffer(GCAllocPurpose purpose) { |
|
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1826 return _alloc_buffers[purpose]; |
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1827 } |
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1828 |
| 1709 | 1829 size_t alloc_buffer_waste() const { return _alloc_buffer_waste; } |
| 1830 size_t undo_waste() const { return _undo_waste; } | |
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1831 |
|
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1832 #ifdef ASSERT |
|
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1833 bool verify_ref(narrowOop* ref) const; |
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1834 bool verify_ref(oop* ref) const; |
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1835 bool verify_task(StarTask ref) const; |
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1836 #endif // ASSERT |
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1837 |
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1838 template <class T> void push_on_queue(T* ref) { |
|
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1839 assert(verify_ref(ref), "sanity"); |
| 1709 | 1840 refs()->push(ref); |
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1841 } |
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1842 |
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1843 template <class T> void update_rs(HeapRegion* from, T* p, int tid) { |
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1844 if (G1DeferredRSUpdate) { |
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1845 deferred_rs_update(from, p, tid); |
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1846 } else { |
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1847 immediate_rs_update(from, p, tid); |
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1848 } |
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1849 } |
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1850 |
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1851 HeapWord* allocate_slow(GCAllocPurpose purpose, size_t word_sz) { |
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1852 HeapWord* obj = NULL; |
|
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1853 size_t gclab_word_size = _g1h->desired_plab_sz(purpose); |
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1854 if (word_sz * 100 < gclab_word_size * ParallelGCBufferWastePct) { |
|
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1855 G1ParGCAllocBuffer* alloc_buf = alloc_buffer(purpose); |
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1856 add_to_alloc_buffer_waste(alloc_buf->words_remaining()); |
|
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1857 alloc_buf->retire(false /* end_of_gc */, false /* retain */); |
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1858 |
|
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1859 HeapWord* buf = _g1h->par_allocate_during_gc(purpose, gclab_word_size); |
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1860 if (buf == NULL) return NULL; // Let caller handle allocation failure. |
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1861 // Otherwise. |
| 6595 | 1862 alloc_buf->set_word_size(gclab_word_size); |
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1863 alloc_buf->set_buf(buf); |
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1864 |
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1865 obj = alloc_buf->allocate(word_sz); |
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1866 assert(obj != NULL, "buffer was definitely big enough..."); |
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1867 } else { |
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1868 obj = _g1h->par_allocate_during_gc(purpose, word_sz); |
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1869 } |
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1870 return obj; |
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1871 } |
|
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1872 |
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1873 HeapWord* allocate(GCAllocPurpose purpose, size_t word_sz) { |
|
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1874 HeapWord* obj = alloc_buffer(purpose)->allocate(word_sz); |
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1875 if (obj != NULL) return obj; |
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1876 return allocate_slow(purpose, word_sz); |
|
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1877 } |
|
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1878 |
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|
1879 void undo_allocation(GCAllocPurpose purpose, HeapWord* obj, size_t word_sz) { |
|
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1880 if (alloc_buffer(purpose)->contains(obj)) { |
|
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|
1881 assert(alloc_buffer(purpose)->contains(obj + word_sz - 1), |
|
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1882 "should contain whole object"); |
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1883 alloc_buffer(purpose)->undo_allocation(obj, word_sz); |
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1884 } else { |
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1885 CollectedHeap::fill_with_object(obj, word_sz); |
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1886 add_to_undo_waste(word_sz); |
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1887 } |
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1888 } |
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1889 |
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1890 void set_evac_failure_closure(OopsInHeapRegionClosure* evac_failure_cl) { |
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1891 _evac_failure_cl = evac_failure_cl; |
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1892 } |
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1893 OopsInHeapRegionClosure* evac_failure_closure() { |
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1894 return _evac_failure_cl; |
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1895 } |
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1896 |
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1897 void set_evac_closure(G1ParScanHeapEvacClosure* evac_cl) { |
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1898 _evac_cl = evac_cl; |
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1899 } |
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1900 |
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1901 void set_partial_scan_closure(G1ParScanPartialArrayClosure* partial_scan_cl) { |
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1902 _partial_scan_cl = partial_scan_cl; |
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1903 } |
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1904 |
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1905 int* hash_seed() { return &_hash_seed; } |
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1906 uint queue_num() { return _queue_num; } |
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1907 |
| 1709 | 1908 size_t term_attempts() const { return _term_attempts; } |
| 1611 | 1909 void note_term_attempt() { _term_attempts++; } |
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1910 |
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1911 void start_strong_roots() { |
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1912 _start_strong_roots = os::elapsedTime(); |
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1913 } |
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1914 void end_strong_roots() { |
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1915 _strong_roots_time += (os::elapsedTime() - _start_strong_roots); |
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1916 } |
| 1709 | 1917 double strong_roots_time() const { return _strong_roots_time; } |
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1918 |
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1919 void start_term_time() { |
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1920 note_term_attempt(); |
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1921 _start_term = os::elapsedTime(); |
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1922 } |
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1923 void end_term_time() { |
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1924 _term_time += (os::elapsedTime() - _start_term); |
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1925 } |
| 1709 | 1926 double term_time() const { return _term_time; } |
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1927 |
| 1709 | 1928 double elapsed_time() const { |
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1929 return os::elapsedTime() - _start; |
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1930 } |
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1931 |
| 1709 | 1932 static void |
| 1933 print_termination_stats_hdr(outputStream* const st = gclog_or_tty); | |
| 1934 void | |
| 1935 print_termination_stats(int i, outputStream* const st = gclog_or_tty) const; | |
| 1936 | |
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1937 size_t* surviving_young_words() { |
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1938 // We add on to hide entry 0 which accumulates surviving words for |
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1939 // age -1 regions (i.e. non-young ones) |
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1940 return _surviving_young_words; |
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1941 } |
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1942 |
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1943 void retire_alloc_buffers() { |
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1944 for (int ap = 0; ap < GCAllocPurposeCount; ++ap) { |
|
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1945 size_t waste = _alloc_buffers[ap]->words_remaining(); |
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1946 add_to_alloc_buffer_waste(waste); |
| 6595 | 1947 _alloc_buffers[ap]->flush_stats_and_retire(_g1h->stats_for_purpose((GCAllocPurpose)ap), |
| 1948 true /* end_of_gc */, | |
| 1949 false /* retain */); | |
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1950 } |
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1951 } |
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1952 |
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1953 template <class T> void deal_with_reference(T* ref_to_scan) { |
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1954 if (has_partial_array_mask(ref_to_scan)) { |
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1955 _partial_scan_cl->do_oop_nv(ref_to_scan); |
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1956 } else { |
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1957 // Note: we can use "raw" versions of "region_containing" because |
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1958 // "obj_to_scan" is definitely in the heap, and is not in a |
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1959 // humongous region. |
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1960 HeapRegion* r = _g1h->heap_region_containing_raw(ref_to_scan); |
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1961 _evac_cl->set_region(r); |
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1962 _evac_cl->do_oop_nv(ref_to_scan); |
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1963 } |
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1964 } |
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1965 |
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1966 void deal_with_reference(StarTask ref) { |
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1967 assert(verify_task(ref), "sanity"); |
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1968 if (ref.is_narrow()) { |
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1969 deal_with_reference((narrowOop*)ref); |
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1970 } else { |
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1971 deal_with_reference((oop*)ref); |
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1972 } |
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1973 } |
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1974 |
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1975 public: |
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1976 void trim_queue(); |
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1977 }; |
| 1972 | 1978 |
| 1979 #endif // SHARE_VM_GC_IMPLEMENTATION_G1_G1COLLECTEDHEAP_HPP |