Mercurial > hg > graal-jvmci-8
annotate src/share/vm/gc_implementation/g1/g1CollectedHeap.hpp @ 20291:e0954897238a
7132678: G1: verify that the marking bitmaps have no marks for objects over TAMS
Reviewed-by: jmasa, tschatzl, ehelin
Contributed-by: tony.printezis@oracle.com, bengt.rutisson@oracle.com
| author | brutisso |
|---|---|
| date | Tue, 29 Apr 2014 09:33:20 +0200 |
| parents | 2c6ef90f030a |
| children | 3f2894c5052e |
| rev | line source |
|---|---|
| 342 | 1 /* |
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2 * Copyright (c) 2001, 2014, Oracle and/or its affiliates. All rights reserved. |
| 342 | 3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
| 4 * | |
| 5 * This code is free software; you can redistribute it and/or modify it | |
| 6 * under the terms of the GNU General Public License version 2 only, as | |
| 7 * published by the Free Software Foundation. | |
| 8 * | |
| 9 * This code is distributed in the hope that it will be useful, but WITHOUT | |
| 10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or | |
| 11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License | |
| 12 * version 2 for more details (a copy is included in the LICENSE file that | |
| 13 * accompanied this code). | |
| 14 * | |
| 15 * You should have received a copy of the GNU General Public License version | |
| 16 * 2 along with this work; if not, write to the Free Software Foundation, | |
| 17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. | |
| 18 * | |
|
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19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
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20 * or visit www.oracle.com if you need additional information or have any |
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21 * questions. |
| 342 | 22 * |
| 23 */ | |
| 24 | |
| 1972 | 25 #ifndef SHARE_VM_GC_IMPLEMENTATION_G1_G1COLLECTEDHEAP_HPP |
| 26 #define SHARE_VM_GC_IMPLEMENTATION_G1_G1COLLECTEDHEAP_HPP | |
| 27 | |
| 28 #include "gc_implementation/g1/concurrentMark.hpp" | |
| 10405 | 29 #include "gc_implementation/g1/evacuationInfo.hpp" |
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30 #include "gc_implementation/g1/g1AllocRegion.hpp" |
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31 #include "gc_implementation/g1/g1BiasedArray.hpp" |
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32 #include "gc_implementation/g1/g1HRPrinter.hpp" |
| 10405 | 33 #include "gc_implementation/g1/g1MonitoringSupport.hpp" |
| 12343 | 34 #include "gc_implementation/g1/g1SATBCardTableModRefBS.hpp" |
| 10405 | 35 #include "gc_implementation/g1/g1YCTypes.hpp" |
| 3766 | 36 #include "gc_implementation/g1/heapRegionSeq.hpp" |
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37 #include "gc_implementation/g1/heapRegionSet.hpp" |
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38 #include "gc_implementation/shared/hSpaceCounters.hpp" |
| 6595 | 39 #include "gc_implementation/shared/parGCAllocBuffer.hpp" |
| 1972 | 40 #include "memory/barrierSet.hpp" |
| 41 #include "memory/memRegion.hpp" | |
| 42 #include "memory/sharedHeap.hpp" | |
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43 #include "utilities/stack.hpp" |
| 1972 | 44 |
| 342 | 45 // A "G1CollectedHeap" is an implementation of a java heap for HotSpot. |
| 46 // It uses the "Garbage First" heap organization and algorithm, which | |
| 47 // may combine concurrent marking with parallel, incremental compaction of | |
| 48 // heap subsets that will yield large amounts of garbage. | |
| 49 | |
| 12080 | 50 // Forward declarations |
| 342 | 51 class HeapRegion; |
| 2173 | 52 class HRRSCleanupTask; |
| 342 | 53 class GenerationSpec; |
| 54 class OopsInHeapRegionClosure; | |
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55 class G1KlassScanClosure; |
| 342 | 56 class G1ScanHeapEvacClosure; |
| 57 class ObjectClosure; | |
| 58 class SpaceClosure; | |
| 59 class CompactibleSpaceClosure; | |
| 60 class Space; | |
| 61 class G1CollectorPolicy; | |
| 62 class GenRemSet; | |
| 63 class G1RemSet; | |
| 64 class HeapRegionRemSetIterator; | |
| 65 class ConcurrentMark; | |
| 66 class ConcurrentMarkThread; | |
| 67 class ConcurrentG1Refine; | |
| 10405 | 68 class ConcurrentGCTimer; |
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69 class GenerationCounters; |
| 10405 | 70 class STWGCTimer; |
| 71 class G1NewTracer; | |
| 72 class G1OldTracer; | |
| 73 class EvacuationFailedInfo; | |
| 12080 | 74 class nmethod; |
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75 class Ticks; |
| 342 | 76 |
| 6197 | 77 typedef OverflowTaskQueue<StarTask, mtGC> RefToScanQueue; |
| 78 typedef GenericTaskQueueSet<RefToScanQueue, mtGC> RefToScanQueueSet; | |
| 342 | 79 |
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80 typedef int RegionIdx_t; // needs to hold [ 0..max_regions() ) |
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81 typedef int CardIdx_t; // needs to hold [ 0..CardsPerRegion ) |
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82 |
| 342 | 83 enum GCAllocPurpose { |
| 84 GCAllocForTenured, | |
| 85 GCAllocForSurvived, | |
| 86 GCAllocPurposeCount | |
| 87 }; | |
| 88 | |
| 6197 | 89 class YoungList : public CHeapObj<mtGC> { |
| 342 | 90 private: |
| 91 G1CollectedHeap* _g1h; | |
| 92 | |
| 93 HeapRegion* _head; | |
| 94 | |
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95 HeapRegion* _survivor_head; |
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96 HeapRegion* _survivor_tail; |
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97 |
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98 HeapRegion* _curr; |
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99 |
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100 uint _length; |
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101 uint _survivor_length; |
| 342 | 102 |
| 103 size_t _last_sampled_rs_lengths; | |
| 104 size_t _sampled_rs_lengths; | |
| 105 | |
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106 void empty_list(HeapRegion* list); |
| 342 | 107 |
| 108 public: | |
| 109 YoungList(G1CollectedHeap* g1h); | |
| 110 | |
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111 void push_region(HeapRegion* hr); |
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112 void add_survivor_region(HeapRegion* hr); |
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113 |
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114 void empty_list(); |
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115 bool is_empty() { return _length == 0; } |
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116 uint length() { return _length; } |
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117 uint survivor_length() { return _survivor_length; } |
| 342 | 118 |
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119 // Currently we do not keep track of the used byte sum for the |
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120 // young list and the survivors and it'd be quite a lot of work to |
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121 // do so. When we'll eventually replace the young list with |
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122 // instances of HeapRegionLinkedList we'll get that for free. So, |
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123 // we'll report the more accurate information then. |
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124 size_t eden_used_bytes() { |
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125 assert(length() >= survivor_length(), "invariant"); |
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126 return (size_t) (length() - survivor_length()) * HeapRegion::GrainBytes; |
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127 } |
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128 size_t survivor_used_bytes() { |
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129 return (size_t) survivor_length() * HeapRegion::GrainBytes; |
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130 } |
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131 |
| 342 | 132 void rs_length_sampling_init(); |
| 133 bool rs_length_sampling_more(); | |
| 134 void rs_length_sampling_next(); | |
| 135 | |
| 136 void reset_sampled_info() { | |
| 137 _last_sampled_rs_lengths = 0; | |
| 138 } | |
| 139 size_t sampled_rs_lengths() { return _last_sampled_rs_lengths; } | |
| 140 | |
| 141 // for development purposes | |
| 142 void reset_auxilary_lists(); | |
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143 void clear() { _head = NULL; _length = 0; } |
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144 |
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145 void clear_survivors() { |
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146 _survivor_head = NULL; |
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147 _survivor_tail = NULL; |
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148 _survivor_length = 0; |
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149 } |
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150 |
| 342 | 151 HeapRegion* first_region() { return _head; } |
| 152 HeapRegion* first_survivor_region() { return _survivor_head; } | |
| 545 | 153 HeapRegion* last_survivor_region() { return _survivor_tail; } |
| 342 | 154 |
| 155 // debugging | |
| 156 bool check_list_well_formed(); | |
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157 bool check_list_empty(bool check_sample = true); |
| 342 | 158 void print(); |
| 159 }; | |
| 160 | |
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161 class MutatorAllocRegion : public G1AllocRegion { |
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162 protected: |
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163 virtual HeapRegion* allocate_new_region(size_t word_size, bool force); |
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164 virtual void retire_region(HeapRegion* alloc_region, size_t allocated_bytes); |
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165 public: |
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166 MutatorAllocRegion() |
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167 : G1AllocRegion("Mutator Alloc Region", false /* bot_updates */) { } |
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168 }; |
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169 |
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170 class SurvivorGCAllocRegion : public G1AllocRegion { |
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171 protected: |
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172 virtual HeapRegion* allocate_new_region(size_t word_size, bool force); |
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173 virtual void retire_region(HeapRegion* alloc_region, size_t allocated_bytes); |
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174 public: |
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175 SurvivorGCAllocRegion() |
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176 : G1AllocRegion("Survivor GC Alloc Region", false /* bot_updates */) { } |
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177 }; |
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178 |
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179 class OldGCAllocRegion : public G1AllocRegion { |
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180 protected: |
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181 virtual HeapRegion* allocate_new_region(size_t word_size, bool force); |
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182 virtual void retire_region(HeapRegion* alloc_region, size_t allocated_bytes); |
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183 public: |
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184 OldGCAllocRegion() |
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185 : G1AllocRegion("Old GC Alloc Region", true /* bot_updates */) { } |
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186 }; |
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187 |
| 12080 | 188 // The G1 STW is alive closure. |
| 189 // An instance is embedded into the G1CH and used as the | |
| 190 // (optional) _is_alive_non_header closure in the STW | |
| 191 // reference processor. It is also extensively used during | |
| 192 // reference processing during STW evacuation pauses. | |
| 193 class G1STWIsAliveClosure: public BoolObjectClosure { | |
| 194 G1CollectedHeap* _g1; | |
| 195 public: | |
| 196 G1STWIsAliveClosure(G1CollectedHeap* g1) : _g1(g1) {} | |
| 197 bool do_object_b(oop p); | |
| 198 }; | |
| 199 | |
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200 // Instances of this class are used for quick tests on whether a reference points |
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201 // into the collection set. Each of the array's elements denotes whether the |
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202 // corresponding region is in the collection set. |
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203 class G1FastCSetBiasedMappedArray : public G1BiasedMappedArray<bool> { |
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204 protected: |
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205 bool default_value() const { return false; } |
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206 public: |
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207 void clear() { G1BiasedMappedArray<bool>::clear(); } |
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208 }; |
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209 |
| 342 | 210 class RefineCardTableEntryClosure; |
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211 |
| 342 | 212 class G1CollectedHeap : public SharedHeap { |
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213 friend class VM_CollectForMetadataAllocation; |
| 342 | 214 friend class VM_G1CollectForAllocation; |
| 215 friend class VM_G1CollectFull; | |
| 216 friend class VM_G1IncCollectionPause; | |
| 217 friend class VMStructs; | |
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218 friend class MutatorAllocRegion; |
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219 friend class SurvivorGCAllocRegion; |
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220 friend class OldGCAllocRegion; |
| 342 | 221 |
| 222 // Closures used in implementation. | |
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223 template <G1Barrier barrier, G1Mark do_mark_object> |
| 5987 | 224 friend class G1ParCopyClosure; |
| 342 | 225 friend class G1IsAliveClosure; |
| 226 friend class G1EvacuateFollowersClosure; | |
| 227 friend class G1ParScanThreadState; | |
| 228 friend class G1ParScanClosureSuper; | |
| 229 friend class G1ParEvacuateFollowersClosure; | |
| 230 friend class G1ParTask; | |
| 231 friend class G1FreeGarbageRegionClosure; | |
| 232 friend class RefineCardTableEntryClosure; | |
| 233 friend class G1PrepareCompactClosure; | |
| 234 friend class RegionSorter; | |
| 2152 | 235 friend class RegionResetter; |
| 342 | 236 friend class CountRCClosure; |
| 237 friend class EvacPopObjClosure; | |
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238 friend class G1ParCleanupCTTask; |
| 342 | 239 |
| 240 // Other related classes. | |
| 241 friend class G1MarkSweep; | |
| 242 | |
| 243 private: | |
| 244 // The one and only G1CollectedHeap, so static functions can find it. | |
| 245 static G1CollectedHeap* _g1h; | |
| 246 | |
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247 static size_t _humongous_object_threshold_in_words; |
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248 |
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249 // Storage for the G1 heap. |
| 342 | 250 VirtualSpace _g1_storage; |
| 251 MemRegion _g1_reserved; | |
| 252 | |
| 253 // The part of _g1_storage that is currently committed. | |
| 254 MemRegion _g1_committed; | |
| 255 | |
| 2152 | 256 // The master free list. It will satisfy all new region allocations. |
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257 FreeRegionList _free_list; |
| 2152 | 258 |
| 259 // The secondary free list which contains regions that have been | |
| 260 // freed up during the cleanup process. This will be appended to the | |
| 261 // master free list when appropriate. | |
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262 FreeRegionList _secondary_free_list; |
| 2152 | 263 |
| 4072 | 264 // It keeps track of the old regions. |
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265 HeapRegionSet _old_set; |
| 4072 | 266 |
| 2152 | 267 // It keeps track of the humongous regions. |
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268 HeapRegionSet _humongous_set; |
| 342 | 269 |
| 270 // The number of regions we could create by expansion. | |
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271 uint _expansion_regions; |
| 342 | 272 |
| 273 // The block offset table for the G1 heap. | |
| 274 G1BlockOffsetSharedArray* _bot_shared; | |
| 275 | |
| 4072 | 276 // Tears down the region sets / lists so that they are empty and the |
| 277 // regions on the heap do not belong to a region set / list. The | |
| 278 // only exception is the humongous set which we leave unaltered. If | |
| 279 // free_list_only is true, it will only tear down the master free | |
| 280 // list. It is called before a Full GC (free_list_only == false) or | |
| 281 // before heap shrinking (free_list_only == true). | |
| 282 void tear_down_region_sets(bool free_list_only); | |
| 283 | |
| 284 // Rebuilds the region sets / lists so that they are repopulated to | |
| 285 // reflect the contents of the heap. The only exception is the | |
| 286 // humongous set which was not torn down in the first place. If | |
| 287 // free_list_only is true, it will only rebuild the master free | |
| 288 // list. It is called after a Full GC (free_list_only == false) or | |
| 289 // after heap shrinking (free_list_only == true). | |
| 290 void rebuild_region_sets(bool free_list_only); | |
| 342 | 291 |
| 292 // The sequence of all heap regions in the heap. | |
| 3766 | 293 HeapRegionSeq _hrs; |
| 342 | 294 |
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295 // Alloc region used to satisfy mutator allocation requests. |
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296 MutatorAllocRegion _mutator_alloc_region; |
| 342 | 297 |
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298 // Alloc region used to satisfy allocation requests by the GC for |
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299 // survivor objects. |
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300 SurvivorGCAllocRegion _survivor_gc_alloc_region; |
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301 |
| 6595 | 302 // PLAB sizing policy for survivors. |
| 303 PLABStats _survivor_plab_stats; | |
| 304 | |
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305 // Alloc region used to satisfy allocation requests by the GC for |
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306 // old objects. |
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307 OldGCAllocRegion _old_gc_alloc_region; |
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308 |
| 6595 | 309 // PLAB sizing policy for tenured objects. |
| 310 PLABStats _old_plab_stats; | |
| 311 | |
| 312 PLABStats* stats_for_purpose(GCAllocPurpose purpose) { | |
| 313 PLABStats* stats = NULL; | |
| 314 | |
| 315 switch (purpose) { | |
| 316 case GCAllocForSurvived: | |
| 317 stats = &_survivor_plab_stats; | |
| 318 break; | |
| 319 case GCAllocForTenured: | |
| 320 stats = &_old_plab_stats; | |
| 321 break; | |
| 322 default: | |
| 323 assert(false, "unrecognized GCAllocPurpose"); | |
| 324 } | |
| 325 | |
| 326 return stats; | |
| 327 } | |
| 328 | |
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329 // The last old region we allocated to during the last GC. |
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330 // Typically, it is not full so we should re-use it during the next GC. |
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331 HeapRegion* _retained_old_gc_alloc_region; |
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332 |
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333 // It specifies whether we should attempt to expand the heap after a |
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334 // region allocation failure. If heap expansion fails we set this to |
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335 // false so that we don't re-attempt the heap expansion (it's likely |
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336 // that subsequent expansion attempts will also fail if one fails). |
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337 // Currently, it is only consulted during GC and it's reset at the |
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338 // start of each GC. |
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339 bool _expand_heap_after_alloc_failure; |
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340 |
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341 // It resets the mutator alloc region before new allocations can take place. |
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342 void init_mutator_alloc_region(); |
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343 |
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344 // It releases the mutator alloc region. |
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345 void release_mutator_alloc_region(); |
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346 |
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347 // It initializes the GC alloc regions at the start of a GC. |
| 10405 | 348 void init_gc_alloc_regions(EvacuationInfo& evacuation_info); |
| 342 | 349 |
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350 // Setup the retained old gc alloc region as the currrent old gc alloc region. |
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351 void use_retained_old_gc_alloc_region(EvacuationInfo& evacuation_info); |
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352 |
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353 // It releases the GC alloc regions at the end of a GC. |
| 10405 | 354 void release_gc_alloc_regions(uint no_of_gc_workers, EvacuationInfo& evacuation_info); |
| 342 | 355 |
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356 // It does any cleanup that needs to be done on the GC alloc regions |
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357 // before a Full GC. |
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358 void abandon_gc_alloc_regions(); |
| 342 | 359 |
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360 // Helper for monitoring and management support. |
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361 G1MonitoringSupport* _g1mm; |
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362 |
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363 // Determines PLAB size for a particular allocation purpose. |
| 6595 | 364 size_t desired_plab_sz(GCAllocPurpose purpose); |
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365 |
| 342 | 366 // Outside of GC pauses, the number of bytes used in all regions other |
| 367 // than the current allocation region. | |
| 368 size_t _summary_bytes_used; | |
| 369 | |
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370 // This array is used for a quick test on whether a reference points into |
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371 // the collection set or not. Each of the array's elements denotes whether the |
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372 // corresponding region is in the collection set or not. |
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373 G1FastCSetBiasedMappedArray _in_cset_fast_test; |
| 526 | 374 |
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375 volatile unsigned _gc_time_stamp; |
| 342 | 376 |
| 377 size_t* _surviving_young_words; | |
| 378 | |
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379 G1HRPrinter _hr_printer; |
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380 |
| 342 | 381 void setup_surviving_young_words(); |
| 382 void update_surviving_young_words(size_t* surv_young_words); | |
| 383 void cleanup_surviving_young_words(); | |
| 384 | |
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385 // It decides whether an explicit GC should start a concurrent cycle |
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386 // instead of doing a STW GC. Currently, a concurrent cycle is |
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387 // explicitly started if: |
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388 // (a) cause == _gc_locker and +GCLockerInvokesConcurrent, or |
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389 // (b) cause == _java_lang_system_gc and +ExplicitGCInvokesConcurrent. |
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390 // (c) cause == _g1_humongous_allocation |
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391 bool should_do_concurrent_full_gc(GCCause::Cause cause); |
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392 |
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393 // Keeps track of how many "old marking cycles" (i.e., Full GCs or |
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394 // concurrent cycles) we have started. |
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395 volatile unsigned int _old_marking_cycles_started; |
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396 |
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397 // Keeps track of how many "old marking cycles" (i.e., Full GCs or |
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398 // concurrent cycles) we have completed. |
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399 volatile unsigned int _old_marking_cycles_completed; |
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400 |
| 10405 | 401 bool _concurrent_cycle_started; |
| 402 | |
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403 // This is a non-product method that is helpful for testing. It is |
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404 // called at the end of a GC and artificially expands the heap by |
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405 // allocating a number of dead regions. This way we can induce very |
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406 // frequent marking cycles and stress the cleanup / concurrent |
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407 // cleanup code more (as all the regions that will be allocated by |
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408 // this method will be found dead by the marking cycle). |
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409 void allocate_dummy_regions() PRODUCT_RETURN; |
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410 |
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411 // Clear RSets after a compaction. It also resets the GC time stamps. |
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412 void clear_rsets_post_compaction(); |
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413 |
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414 // If the HR printer is active, dump the state of the regions in the |
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415 // heap after a compaction. |
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416 void print_hrs_post_compaction(); |
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417 |
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418 double verify(bool guard, const char* msg); |
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419 void verify_before_gc(); |
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420 void verify_after_gc(); |
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421 |
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422 void log_gc_header(); |
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423 void log_gc_footer(double pause_time_sec); |
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424 |
| 1973 | 425 // These are macros so that, if the assert fires, we get the correct |
| 426 // line number, file, etc. | |
| 427 | |
| 2361 | 428 #define heap_locking_asserts_err_msg(_extra_message_) \ |
| 2152 | 429 err_msg("%s : Heap_lock locked: %s, at safepoint: %s, is VM thread: %s", \ |
| 2361 | 430 (_extra_message_), \ |
| 2152 | 431 BOOL_TO_STR(Heap_lock->owned_by_self()), \ |
| 432 BOOL_TO_STR(SafepointSynchronize::is_at_safepoint()), \ | |
| 433 BOOL_TO_STR(Thread::current()->is_VM_thread())) | |
| 1973 | 434 |
| 435 #define assert_heap_locked() \ | |
| 436 do { \ | |
| 437 assert(Heap_lock->owned_by_self(), \ | |
| 438 heap_locking_asserts_err_msg("should be holding the Heap_lock")); \ | |
| 439 } while (0) | |
| 440 | |
| 2361 | 441 #define assert_heap_locked_or_at_safepoint(_should_be_vm_thread_) \ |
| 1973 | 442 do { \ |
| 443 assert(Heap_lock->owned_by_self() || \ | |
| 2152 | 444 (SafepointSynchronize::is_at_safepoint() && \ |
| 2361 | 445 ((_should_be_vm_thread_) == Thread::current()->is_VM_thread())), \ |
| 1973 | 446 heap_locking_asserts_err_msg("should be holding the Heap_lock or " \ |
| 447 "should be at a safepoint")); \ | |
| 448 } while (0) | |
| 449 | |
| 450 #define assert_heap_locked_and_not_at_safepoint() \ | |
| 451 do { \ | |
| 452 assert(Heap_lock->owned_by_self() && \ | |
| 453 !SafepointSynchronize::is_at_safepoint(), \ | |
| 454 heap_locking_asserts_err_msg("should be holding the Heap_lock and " \ | |
| 455 "should not be at a safepoint")); \ | |
| 456 } while (0) | |
| 457 | |
| 458 #define assert_heap_not_locked() \ | |
| 459 do { \ | |
| 460 assert(!Heap_lock->owned_by_self(), \ | |
| 461 heap_locking_asserts_err_msg("should not be holding the Heap_lock")); \ | |
| 462 } while (0) | |
| 463 | |
| 464 #define assert_heap_not_locked_and_not_at_safepoint() \ | |
| 465 do { \ | |
| 466 assert(!Heap_lock->owned_by_self() && \ | |
| 467 !SafepointSynchronize::is_at_safepoint(), \ | |
| 468 heap_locking_asserts_err_msg("should not be holding the Heap_lock and " \ | |
| 469 "should not be at a safepoint")); \ | |
| 470 } while (0) | |
| 471 | |
| 2361 | 472 #define assert_at_safepoint(_should_be_vm_thread_) \ |
| 1973 | 473 do { \ |
| 2152 | 474 assert(SafepointSynchronize::is_at_safepoint() && \ |
| 2361 | 475 ((_should_be_vm_thread_) == Thread::current()->is_VM_thread()), \ |
| 1973 | 476 heap_locking_asserts_err_msg("should be at a safepoint")); \ |
| 477 } while (0) | |
| 478 | |
| 479 #define assert_not_at_safepoint() \ | |
| 480 do { \ | |
| 481 assert(!SafepointSynchronize::is_at_safepoint(), \ | |
| 482 heap_locking_asserts_err_msg("should not be at a safepoint")); \ | |
| 483 } while (0) | |
| 484 | |
| 342 | 485 protected: |
| 486 | |
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487 // The young region list. |
| 342 | 488 YoungList* _young_list; |
| 489 | |
| 490 // The current policy object for the collector. | |
| 491 G1CollectorPolicy* _g1_policy; | |
| 492 | |
| 2152 | 493 // This is the second level of trying to allocate a new region. If |
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494 // new_region() didn't find a region on the free_list, this call will |
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495 // check whether there's anything available on the |
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496 // secondary_free_list and/or wait for more regions to appear on |
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497 // that list, if _free_regions_coming is set. |
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498 HeapRegion* new_region_try_secondary_free_list(bool is_old); |
| 342 | 499 |
| 2361 | 500 // Try to allocate a single non-humongous HeapRegion sufficient for |
| 501 // an allocation of the given word_size. If do_expand is true, | |
| 502 // attempt to expand the heap if necessary to satisfy the allocation | |
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503 // request. If the region is to be used as an old region or for a |
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504 // humongous object, set is_old to true. If not, to false. |
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505 HeapRegion* new_region(size_t word_size, bool is_old, bool do_expand); |
| 342 | 506 |
| 2361 | 507 // Attempt to satisfy a humongous allocation request of the given |
| 508 // size by finding a contiguous set of free regions of num_regions | |
| 509 // length and remove them from the master free list. Return the | |
| 3766 | 510 // index of the first region or G1_NULL_HRS_INDEX if the search |
| 511 // was unsuccessful. | |
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512 uint humongous_obj_allocate_find_first(uint num_regions, |
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513 size_t word_size); |
| 342 | 514 |
| 2361 | 515 // Initialize a contiguous set of free regions of length num_regions |
| 516 // and starting at index first so that they appear as a single | |
| 517 // humongous region. | |
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518 HeapWord* humongous_obj_allocate_initialize_regions(uint first, |
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519 uint num_regions, |
| 2361 | 520 size_t word_size); |
| 521 | |
| 522 // Attempt to allocate a humongous object of the given size. Return | |
| 523 // NULL if unsuccessful. | |
| 2152 | 524 HeapWord* humongous_obj_allocate(size_t word_size); |
| 1973 | 525 |
| 526 // The following two methods, allocate_new_tlab() and | |
| 527 // mem_allocate(), are the two main entry points from the runtime | |
| 528 // into the G1's allocation routines. They have the following | |
| 529 // assumptions: | |
| 530 // | |
| 531 // * They should both be called outside safepoints. | |
| 532 // | |
| 533 // * They should both be called without holding the Heap_lock. | |
| 534 // | |
| 535 // * All allocation requests for new TLABs should go to | |
| 536 // allocate_new_tlab(). | |
| 537 // | |
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538 // * All non-TLAB allocation requests should go to mem_allocate(). |
| 1973 | 539 // |
| 540 // * If either call cannot satisfy the allocation request using the | |
| 541 // current allocating region, they will try to get a new one. If | |
| 542 // this fails, they will attempt to do an evacuation pause and | |
| 543 // retry the allocation. | |
| 544 // | |
| 545 // * If all allocation attempts fail, even after trying to schedule | |
| 546 // an evacuation pause, allocate_new_tlab() will return NULL, | |
| 547 // whereas mem_allocate() will attempt a heap expansion and/or | |
| 548 // schedule a Full GC. | |
| 549 // | |
| 550 // * We do not allow humongous-sized TLABs. So, allocate_new_tlab | |
| 551 // should never be called with word_size being humongous. All | |
| 552 // humongous allocation requests should go to mem_allocate() which | |
| 553 // will satisfy them with a special path. | |
| 554 | |
| 555 virtual HeapWord* allocate_new_tlab(size_t word_size); | |
| 556 | |
| 557 virtual HeapWord* mem_allocate(size_t word_size, | |
| 558 bool* gc_overhead_limit_was_exceeded); | |
| 342 | 559 |
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560 // The following three methods take a gc_count_before_ret |
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561 // parameter which is used to return the GC count if the method |
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562 // returns NULL. Given that we are required to read the GC count |
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563 // while holding the Heap_lock, and these paths will take the |
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564 // Heap_lock at some point, it's easier to get them to read the GC |
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565 // count while holding the Heap_lock before they return NULL instead |
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566 // of the caller (namely: mem_allocate()) having to also take the |
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567 // Heap_lock just to read the GC count. |
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568 |
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569 // First-level mutator allocation attempt: try to allocate out of |
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570 // the mutator alloc region without taking the Heap_lock. This |
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571 // should only be used for non-humongous allocations. |
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572 inline HeapWord* attempt_allocation(size_t word_size, |
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573 unsigned int* gc_count_before_ret, |
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574 int* gclocker_retry_count_ret); |
| 342 | 575 |
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576 // Second-level mutator allocation attempt: take the Heap_lock and |
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577 // retry the allocation attempt, potentially scheduling a GC |
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578 // pause. This should only be used for non-humongous allocations. |
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579 HeapWord* attempt_allocation_slow(size_t word_size, |
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580 unsigned int* gc_count_before_ret, |
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581 int* gclocker_retry_count_ret); |
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582 |
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583 // Takes the Heap_lock and attempts a humongous allocation. It can |
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584 // potentially schedule a GC pause. |
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585 HeapWord* attempt_allocation_humongous(size_t word_size, |
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586 unsigned int* gc_count_before_ret, |
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587 int* gclocker_retry_count_ret); |
| 1973 | 588 |
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589 // Allocation attempt that should be called during safepoints (e.g., |
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590 // at the end of a successful GC). expect_null_mutator_alloc_region |
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591 // specifies whether the mutator alloc region is expected to be NULL |
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592 // or not. |
| 1973 | 593 HeapWord* attempt_allocation_at_safepoint(size_t word_size, |
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594 bool expect_null_mutator_alloc_region); |
| 1973 | 595 |
| 596 // It dirties the cards that cover the block so that so that the post | |
| 597 // write barrier never queues anything when updating objects on this | |
| 598 // block. It is assumed (and in fact we assert) that the block | |
| 599 // belongs to a young region. | |
| 600 inline void dirty_young_block(HeapWord* start, size_t word_size); | |
| 342 | 601 |
| 602 // Allocate blocks during garbage collection. Will ensure an | |
| 603 // allocation region, either by picking one or expanding the | |
| 604 // heap, and then allocate a block of the given size. The block | |
| 605 // may not be a humongous - it must fit into a single heap region. | |
| 606 HeapWord* par_allocate_during_gc(GCAllocPurpose purpose, size_t word_size); | |
| 607 | |
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608 HeapWord* allocate_during_gc_slow(GCAllocPurpose purpose, |
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609 HeapRegion* alloc_region, |
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610 bool par, |
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611 size_t word_size); |
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612 |
| 342 | 613 // Ensure that no further allocations can happen in "r", bearing in mind |
| 614 // that parallel threads might be attempting allocations. | |
| 615 void par_allocate_remaining_space(HeapRegion* r); | |
| 616 | |
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617 // Allocation attempt during GC for a survivor object / PLAB. |
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618 inline HeapWord* survivor_attempt_allocation(size_t word_size); |
| 545 | 619 |
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620 // Allocation attempt during GC for an old object / PLAB. |
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621 inline HeapWord* old_attempt_allocation(size_t word_size); |
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622 |
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623 // These methods are the "callbacks" from the G1AllocRegion class. |
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624 |
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625 // For mutator alloc regions. |
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626 HeapRegion* new_mutator_alloc_region(size_t word_size, bool force); |
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627 void retire_mutator_alloc_region(HeapRegion* alloc_region, |
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628 size_t allocated_bytes); |
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629 |
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630 // For GC alloc regions. |
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631 HeapRegion* new_gc_alloc_region(size_t word_size, uint count, |
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632 GCAllocPurpose ap); |
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633 void retire_gc_alloc_region(HeapRegion* alloc_region, |
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634 size_t allocated_bytes, GCAllocPurpose ap); |
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635 |
|
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636 // - if explicit_gc is true, the GC is for a System.gc() or a heap |
| 1973 | 637 // inspection request and should collect the entire heap |
| 638 // - if clear_all_soft_refs is true, all soft references should be | |
| 639 // cleared during the GC | |
|
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640 // - if explicit_gc is false, word_size describes the allocation that |
| 1973 | 641 // the GC should attempt (at least) to satisfy |
| 642 // - it returns false if it is unable to do the collection due to the | |
| 643 // GC locker being active, true otherwise | |
| 644 bool do_collection(bool explicit_gc, | |
|
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645 bool clear_all_soft_refs, |
| 342 | 646 size_t word_size); |
| 647 | |
| 648 // Callback from VM_G1CollectFull operation. | |
| 649 // Perform a full collection. | |
|
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650 virtual void do_full_collection(bool clear_all_soft_refs); |
| 342 | 651 |
| 652 // Resize the heap if necessary after a full collection. If this is | |
| 653 // after a collect-for allocation, "word_size" is the allocation size, | |
| 654 // and will be considered part of the used portion of the heap. | |
| 655 void resize_if_necessary_after_full_collection(size_t word_size); | |
| 656 | |
| 657 // Callback from VM_G1CollectForAllocation operation. | |
| 658 // This function does everything necessary/possible to satisfy a | |
| 659 // failed allocation request (including collection, expansion, etc.) | |
| 1973 | 660 HeapWord* satisfy_failed_allocation(size_t word_size, bool* succeeded); |
| 342 | 661 |
| 662 // Attempting to expand the heap sufficiently | |
| 663 // to support an allocation of the given "word_size". If | |
| 664 // successful, perform the allocation and return the address of the | |
| 665 // allocated block, or else "NULL". | |
| 1973 | 666 HeapWord* expand_and_allocate(size_t word_size); |
| 342 | 667 |
|
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668 // Process any reference objects discovered during |
|
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669 // an incremental evacuation pause. |
| 6819 | 670 void process_discovered_references(uint no_of_gc_workers); |
|
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|
671 |
|
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|
672 // Enqueue any remaining discovered references |
|
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673 // after processing. |
| 6819 | 674 void enqueue_discovered_references(uint no_of_gc_workers); |
|
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675 |
| 342 | 676 public: |
|
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677 |
|
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678 G1MonitoringSupport* g1mm() { |
|
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|
679 assert(_g1mm != NULL, "should have been initialized"); |
|
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680 return _g1mm; |
|
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681 } |
|
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682 |
| 342 | 683 // Expand the garbage-first heap by at least the given size (in bytes!). |
|
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684 // Returns true if the heap was expanded by the requested amount; |
|
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685 // false otherwise. |
| 342 | 686 // (Rounds up to a HeapRegion boundary.) |
|
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|
687 bool expand(size_t expand_bytes); |
| 342 | 688 |
| 689 // Do anything common to GC's. | |
| 690 virtual void gc_prologue(bool full); | |
| 691 virtual void gc_epilogue(bool full); | |
| 692 | |
| 526 | 693 // We register a region with the fast "in collection set" test. We |
| 694 // simply set to true the array slot corresponding to this region. | |
| 695 void register_region_with_in_cset_fast_test(HeapRegion* r) { | |
|
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|
696 _in_cset_fast_test.set_by_index(r->hrs_index(), true); |
| 526 | 697 } |
| 698 | |
| 699 // This is a fast test on whether a reference points into the | |
|
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700 // collection set or not. Assume that the reference |
|
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|
701 // points into the heap. |
|
17833
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|
702 inline bool in_cset_fast_test(oop obj); |
| 526 | 703 |
|
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704 void clear_cset_fast_test() { |
|
20212
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|
705 _in_cset_fast_test.clear(); |
|
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|
706 } |
|
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|
707 |
|
6120
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|
708 // This is called at the start of either a concurrent cycle or a Full |
|
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|
709 // GC to update the number of old marking cycles started. |
|
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7172388: G1: _total_full_collections should not be incremented for concurrent cycles
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|
710 void increment_old_marking_cycles_started(); |
|
37552638d24a
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|
711 |
|
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|
712 // This is called at the end of either a concurrent cycle or a Full |
|
6120
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7172388: G1: _total_full_collections should not be incremented for concurrent cycles
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|
713 // GC to update the number of old marking cycles completed. Those two |
|
1656
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|
714 // can happen in a nested fashion, i.e., we start a concurrent |
|
4e5661ba9d98
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|
715 // cycle, a Full GC happens half-way through it which ends first, |
|
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diff
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|
716 // 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)
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1991
diff
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|
717 // 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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1991
diff
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|
718 // tighter consistency checking in the method. If concurrent is |
|
fb712ff22571
7000559: G1: assertion failure !outer || (full_collections_started == _full_collections_completed + 1)
tonyp
parents:
1991
diff
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|
719 // false, the caller is the inner caller in the nesting (i.e., the |
|
fb712ff22571
7000559: G1: assertion failure !outer || (full_collections_started == _full_collections_completed + 1)
tonyp
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1991
diff
changeset
|
720 // Full GC). If concurrent is true, the caller is the outer caller |
|
fb712ff22571
7000559: G1: assertion failure !outer || (full_collections_started == _full_collections_completed + 1)
tonyp
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1991
diff
changeset
|
721 // in this nesting (i.e., the concurrent cycle). Further nesting is |
|
6120
37552638d24a
7172388: G1: _total_full_collections should not be incremented for concurrent cycles
brutisso
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6010
diff
changeset
|
722 // not currently supported. The end of this call also notifies |
|
2030
fb712ff22571
7000559: G1: assertion failure !outer || (full_collections_started == _full_collections_completed + 1)
tonyp
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diff
changeset
|
723 // the FullGCCount_lock in case a Java thread is waiting for a full |
|
fb712ff22571
7000559: G1: assertion failure !outer || (full_collections_started == _full_collections_completed + 1)
tonyp
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1991
diff
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|
724 // GC to happen (e.g., it called System.gc() with |
|
1656
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6944166: G1: explicit GCs are not always handled correctly
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|
725 // +ExplicitGCInvokesConcurrent). |
|
6120
37552638d24a
7172388: G1: _total_full_collections should not be incremented for concurrent cycles
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diff
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|
726 void increment_old_marking_cycles_completed(bool concurrent); |
|
1656
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tonyp
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|
727 |
|
6120
37552638d24a
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brutisso
parents:
6010
diff
changeset
|
728 unsigned int old_marking_cycles_completed() { |
|
37552638d24a
7172388: G1: _total_full_collections should not be incremented for concurrent cycles
brutisso
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6010
diff
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|
729 return _old_marking_cycles_completed; |
|
1656
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6944166: G1: explicit GCs are not always handled correctly
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|
730 } |
|
4e5661ba9d98
6944166: G1: explicit GCs are not always handled correctly
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|
731 |
|
13400
86e6d691f2e1
8028128: Add a type safe alternative for working with counter based data
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parents:
12352
diff
changeset
|
732 void register_concurrent_cycle_start(const Ticks& start_time); |
| 10405 | 733 void register_concurrent_cycle_end(); |
| 734 void trace_heap_after_concurrent_cycle(); | |
| 735 | |
| 736 G1YCType yc_type(); | |
| 737 | |
|
3778
5f6f2615433a
7049999: G1: Make the G1PrintHeapRegions output consistent and complete
tonyp
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3777
diff
changeset
|
738 G1HRPrinter* hr_printer() { return &_hr_printer; } |
|
5f6f2615433a
7049999: G1: Make the G1PrintHeapRegions output consistent and complete
tonyp
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3777
diff
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|
739 |
|
17736
58fc1b1523dc
8034079: G1: Refactor the HeapRegionSet hierarchy
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17727
diff
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|
740 // Frees a non-humongous region by initializing its contents and |
|
58fc1b1523dc
8034079: G1: Refactor the HeapRegionSet hierarchy
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changeset
|
741 // adding it to the free list that's passed as a parameter (this is |
|
58fc1b1523dc
8034079: G1: Refactor the HeapRegionSet hierarchy
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diff
changeset
|
742 // usually a local list which will be appended to the master free |
|
58fc1b1523dc
8034079: G1: Refactor the HeapRegionSet hierarchy
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diff
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|
743 // list later). The used bytes of freed regions are accumulated in |
|
58fc1b1523dc
8034079: G1: Refactor the HeapRegionSet hierarchy
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diff
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|
744 // pre_used. If par is true, the region's RSet will not be freed |
|
58fc1b1523dc
8034079: G1: Refactor the HeapRegionSet hierarchy
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diff
changeset
|
745 // up. The assumption is that this will be done later. |
|
17755
96b1c2e06e25
8027295: Free CSet takes ~50% of young pause time
tschatzl
parents:
17753
diff
changeset
|
746 // The locked parameter indicates if the caller has already taken |
|
96b1c2e06e25
8027295: Free CSet takes ~50% of young pause time
tschatzl
parents:
17753
diff
changeset
|
747 // care of proper synchronization. This may allow some optimizations. |
|
17736
58fc1b1523dc
8034079: G1: Refactor the HeapRegionSet hierarchy
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|
748 void free_region(HeapRegion* hr, |
|
58fc1b1523dc
8034079: G1: Refactor the HeapRegionSet hierarchy
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diff
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|
749 FreeRegionList* free_list, |
|
17755
96b1c2e06e25
8027295: Free CSet takes ~50% of young pause time
tschatzl
parents:
17753
diff
changeset
|
750 bool par, |
|
96b1c2e06e25
8027295: Free CSet takes ~50% of young pause time
tschatzl
parents:
17753
diff
changeset
|
751 bool locked = false); |
|
17736
58fc1b1523dc
8034079: G1: Refactor the HeapRegionSet hierarchy
brutisso
parents:
17727
diff
changeset
|
752 |
|
58fc1b1523dc
8034079: G1: Refactor the HeapRegionSet hierarchy
brutisso
parents:
17727
diff
changeset
|
753 // Frees a humongous region by collapsing it into individual regions |
|
58fc1b1523dc
8034079: G1: Refactor the HeapRegionSet hierarchy
brutisso
parents:
17727
diff
changeset
|
754 // and calling free_region() for each of them. The freed regions |
|
58fc1b1523dc
8034079: G1: Refactor the HeapRegionSet hierarchy
brutisso
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17727
diff
changeset
|
755 // will be added to the free list that's passed as a parameter (this |
|
58fc1b1523dc
8034079: G1: Refactor the HeapRegionSet hierarchy
brutisso
parents:
17727
diff
changeset
|
756 // is usually a local list which will be appended to the master free |
|
58fc1b1523dc
8034079: G1: Refactor the HeapRegionSet hierarchy
brutisso
parents:
17727
diff
changeset
|
757 // list later). The used bytes of freed regions are accumulated in |
|
58fc1b1523dc
8034079: G1: Refactor the HeapRegionSet hierarchy
brutisso
parents:
17727
diff
changeset
|
758 // pre_used. If par is true, the region's RSet will not be freed |
|
58fc1b1523dc
8034079: G1: Refactor the HeapRegionSet hierarchy
brutisso
parents:
17727
diff
changeset
|
759 // up. The assumption is that this will be done later. |
|
58fc1b1523dc
8034079: G1: Refactor the HeapRegionSet hierarchy
brutisso
parents:
17727
diff
changeset
|
760 void free_humongous_region(HeapRegion* hr, |
|
58fc1b1523dc
8034079: G1: Refactor the HeapRegionSet hierarchy
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17727
diff
changeset
|
761 FreeRegionList* free_list, |
|
58fc1b1523dc
8034079: G1: Refactor the HeapRegionSet hierarchy
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|
762 bool par); |
| 342 | 763 protected: |
| 764 | |
| 765 // Shrink the garbage-first heap by at most the given size (in bytes!). | |
| 766 // (Rounds down to a HeapRegion boundary.) | |
| 767 virtual void shrink(size_t expand_bytes); | |
| 768 void shrink_helper(size_t expand_bytes); | |
| 769 | |
| 1709 | 770 #if TASKQUEUE_STATS |
| 771 static void print_taskqueue_stats_hdr(outputStream* const st = gclog_or_tty); | |
| 772 void print_taskqueue_stats(outputStream* const st = gclog_or_tty) const; | |
| 773 void reset_taskqueue_stats(); | |
| 774 #endif // TASKQUEUE_STATS | |
| 775 | |
| 1973 | 776 // Schedule the VM operation that will do an evacuation pause to |
| 777 // satisfy an allocation request of word_size. *succeeded will | |
| 778 // return whether the VM operation was successful (it did do an | |
| 779 // evacuation pause) or not (another thread beat us to it or the GC | |
| 780 // locker was active). Given that we should not be holding the | |
| 781 // Heap_lock when we enter this method, we will pass the | |
| 782 // gc_count_before (i.e., total_collections()) as a parameter since | |
| 783 // it has to be read while holding the Heap_lock. Currently, both | |
| 784 // methods that call do_collection_pause() release the Heap_lock | |
| 785 // before the call, so it's easy to read gc_count_before just before. | |
|
12113
f7d3b4387a16
8022872: G1: Use correct GC cause for young GC triggered by humongous allocations
brutisso
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12080
diff
changeset
|
786 HeapWord* do_collection_pause(size_t word_size, |
|
f7d3b4387a16
8022872: G1: Use correct GC cause for young GC triggered by humongous allocations
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diff
changeset
|
787 unsigned int gc_count_before, |
|
f7d3b4387a16
8022872: G1: Use correct GC cause for young GC triggered by humongous allocations
brutisso
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12080
diff
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|
788 bool* succeeded, |
|
f7d3b4387a16
8022872: G1: Use correct GC cause for young GC triggered by humongous allocations
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diff
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|
789 GCCause::Cause gc_cause); |
| 342 | 790 |
| 791 // The guts of the incremental collection pause, executed by the vm | |
| 1973 | 792 // thread. It returns false if it is unable to do the collection due |
| 793 // to the GC locker being active, true otherwise | |
| 794 bool do_collection_pause_at_safepoint(double target_pause_time_ms); | |
| 342 | 795 |
| 796 // Actually do the work of evacuating the collection set. | |
| 10405 | 797 void evacuate_collection_set(EvacuationInfo& evacuation_info); |
| 342 | 798 |
| 799 // The g1 remembered set of the heap. | |
| 800 G1RemSet* _g1_rem_set; | |
| 801 | |
|
616
4f360ec815ba
6720309: G1: don't synchronously update RSet during evacuation pauses
iveresov
parents:
545
diff
changeset
|
802 // A set of cards that cover the objects for which the Rsets should be updated |
|
4f360ec815ba
6720309: G1: don't synchronously update RSet during evacuation pauses
iveresov
parents:
545
diff
changeset
|
803 // concurrently after the collection. |
|
4f360ec815ba
6720309: G1: don't synchronously update RSet during evacuation pauses
iveresov
parents:
545
diff
changeset
|
804 DirtyCardQueueSet _dirty_card_queue_set; |
|
4f360ec815ba
6720309: G1: don't synchronously update RSet during evacuation pauses
iveresov
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diff
changeset
|
805 |
| 342 | 806 // The closure used to refine a single card. |
| 807 RefineCardTableEntryClosure* _refine_cte_cl; | |
| 808 | |
| 809 // A function to check the consistency of dirty card logs. | |
| 810 void check_ct_logs_at_safepoint(); | |
| 811 | |
| 1705 | 812 // A DirtyCardQueueSet that is used to hold cards that contain |
| 813 // references into the current collection set. This is used to | |
| 814 // update the remembered sets of the regions in the collection | |
| 815 // set in the event of an evacuation failure. | |
| 816 DirtyCardQueueSet _into_cset_dirty_card_queue_set; | |
| 817 | |
| 342 | 818 // After a collection pause, make the regions in the CS into free |
| 819 // regions. | |
| 10405 | 820 void free_collection_set(HeapRegion* cs_head, EvacuationInfo& evacuation_info); |
| 342 | 821 |
|
1394
1316cec51b4d
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parents:
1391
diff
changeset
|
822 // Abandon the current collection set without recording policy |
|
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
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|
823 // statistics or updating free lists. |
|
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824 void abandon_collection_set(HeapRegion* cs_head); |
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825 |
| 342 | 826 // Applies "scan_non_heap_roots" to roots outside the heap, |
| 827 // "scan_rs" to roots inside the heap (having done "set_region" to | |
|
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828 // indicate the region in which the root resides), |
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829 // and does "scan_metadata" If "scan_rs" is |
| 342 | 830 // NULL, then this step is skipped. The "worker_i" |
| 831 // param is for use with parallel roots processing, and should be | |
| 832 // the "i" of the calling parallel worker thread's work(i) function. | |
| 833 // In the sequential case this param will be ignored. | |
|
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834 void g1_process_roots(OopClosure* scan_non_heap_roots, |
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835 OopClosure* scan_non_heap_weak_roots, |
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836 OopsInHeapRegionClosure* scan_rs, |
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837 CLDClosure* scan_strong_clds, |
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838 CLDClosure* scan_weak_clds, |
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839 CodeBlobClosure* scan_strong_code, |
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|
840 uint worker_i); |
| 342 | 841 |
| 3766 | 842 // Notifies all the necessary spaces that the committed space has |
| 843 // been updated (either expanded or shrunk). It should be called | |
| 844 // after _g1_storage is updated. | |
| 845 void update_committed_space(HeapWord* old_end, HeapWord* new_end); | |
| 846 | |
| 342 | 847 // The concurrent marker (and the thread it runs in.) |
| 848 ConcurrentMark* _cm; | |
| 849 ConcurrentMarkThread* _cmThread; | |
| 850 bool _mark_in_progress; | |
| 851 | |
| 852 // The concurrent refiner. | |
| 853 ConcurrentG1Refine* _cg1r; | |
| 854 | |
| 855 // The parallel task queues | |
| 856 RefToScanQueueSet *_task_queues; | |
| 857 | |
| 858 // True iff a evacuation has failed in the current collection. | |
| 859 bool _evacuation_failed; | |
| 860 | |
| 10405 | 861 EvacuationFailedInfo* _evacuation_failed_info_array; |
| 342 | 862 |
| 863 // Failed evacuations cause some logical from-space objects to have | |
| 864 // forwarding pointers to themselves. Reset them. | |
| 865 void remove_self_forwarding_pointers(); | |
| 866 | |
|
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867 // Together, these store an object with a preserved mark, and its mark value. |
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868 Stack<oop, mtGC> _objs_with_preserved_marks; |
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869 Stack<markOop, mtGC> _preserved_marks_of_objs; |
| 342 | 870 |
| 871 // Preserve the mark of "obj", if necessary, in preparation for its mark | |
| 872 // word being overwritten with a self-forwarding-pointer. | |
| 873 void preserve_mark_if_necessary(oop obj, markOop m); | |
| 874 | |
| 875 // The stack of evac-failure objects left to be scanned. | |
| 876 GrowableArray<oop>* _evac_failure_scan_stack; | |
| 877 // The closure to apply to evac-failure objects. | |
| 878 | |
| 879 OopsInHeapRegionClosure* _evac_failure_closure; | |
| 880 // Set the field above. | |
| 881 void | |
| 882 set_evac_failure_closure(OopsInHeapRegionClosure* evac_failure_closure) { | |
| 883 _evac_failure_closure = evac_failure_closure; | |
| 884 } | |
| 885 | |
| 886 // Push "obj" on the scan stack. | |
| 887 void push_on_evac_failure_scan_stack(oop obj); | |
| 888 // Process scan stack entries until the stack is empty. | |
| 889 void drain_evac_failure_scan_stack(); | |
| 890 // True iff an invocation of "drain_scan_stack" is in progress; to | |
| 891 // prevent unnecessary recursion. | |
| 892 bool _drain_in_progress; | |
| 893 | |
| 894 // Do any necessary initialization for evacuation-failure handling. | |
| 895 // "cl" is the closure that will be used to process evac-failure | |
| 896 // objects. | |
| 897 void init_for_evac_failure(OopsInHeapRegionClosure* cl); | |
| 898 // Do any necessary cleanup for evacuation-failure handling data | |
| 899 // structures. | |
| 900 void finalize_for_evac_failure(); | |
| 901 | |
| 902 // An attempt to evacuate "obj" has failed; take necessary steps. | |
| 10405 | 903 oop handle_evacuation_failure_par(G1ParScanThreadState* _par_scan_state, oop obj); |
| 342 | 904 void handle_evacuation_failure_common(oop obj, markOop m); |
| 905 | |
|
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906 #ifndef PRODUCT |
|
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907 // Support for forcing evacuation failures. Analogous to |
|
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908 // PromotionFailureALot for the other collectors. |
|
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|
909 |
|
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910 // Records whether G1EvacuationFailureALot should be in effect |
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911 // for the current GC |
|
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912 bool _evacuation_failure_alot_for_current_gc; |
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913 |
|
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914 // Used to record the GC number for interval checking when |
|
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915 // determining whether G1EvaucationFailureALot is in effect |
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916 // for the current GC. |
|
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|
917 size_t _evacuation_failure_alot_gc_number; |
|
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|
918 |
|
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919 // Count of the number of evacuations between failures. |
|
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920 volatile size_t _evacuation_failure_alot_count; |
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|
921 |
|
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922 // Set whether G1EvacuationFailureALot should be in effect |
|
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923 // for the current GC (based upon the type of GC and which |
|
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924 // command line flags are set); |
|
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|
925 inline bool evacuation_failure_alot_for_gc_type(bool gcs_are_young, |
|
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|
926 bool during_initial_mark, |
|
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927 bool during_marking); |
|
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|
928 |
|
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|
929 inline void set_evacuation_failure_alot_for_current_gc(); |
|
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|
930 |
|
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|
931 // Return true if it's time to cause an evacuation failure. |
|
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|
932 inline bool evacuation_should_fail(); |
|
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|
933 |
|
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|
934 // Reset the G1EvacuationFailureALot counters. Should be called at |
| 10405 | 935 // the end of an evacuation pause in which an evacuation failure occurred. |
|
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936 inline void reset_evacuation_should_fail(); |
|
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|
937 #endif // !PRODUCT |
|
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|
938 |
|
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|
939 // ("Weak") Reference processing support. |
|
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|
940 // |
| 10405 | 941 // G1 has 2 instances of the reference processor class. One |
|
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|
942 // (_ref_processor_cm) handles reference object discovery |
|
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|
943 // and subsequent processing during concurrent marking cycles. |
|
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|
944 // |
|
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|
945 // The other (_ref_processor_stw) handles reference object |
|
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|
946 // discovery and processing during full GCs and incremental |
|
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|
947 // evacuation pauses. |
|
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|
948 // |
|
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|
949 // During an incremental pause, reference discovery will be |
|
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|
950 // temporarily disabled for _ref_processor_cm and will be |
|
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|
951 // enabled for _ref_processor_stw. At the end of the evacuation |
|
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952 // pause references discovered by _ref_processor_stw will be |
|
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953 // processed and discovery will be disabled. The previous |
|
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|
954 // setting for reference object discovery for _ref_processor_cm |
|
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|
955 // will be re-instated. |
|
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|
956 // |
|
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957 // At the start of marking: |
|
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958 // * Discovery by the CM ref processor is verified to be inactive |
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|
959 // and it's discovered lists are empty. |
|
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960 // * Discovery by the CM ref processor is then enabled. |
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|
961 // |
|
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962 // At the end of marking: |
|
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963 // * Any references on the CM ref processor's discovered |
|
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|
964 // lists are processed (possibly MT). |
|
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|
965 // |
|
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966 // At the start of full GC we: |
|
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967 // * Disable discovery by the CM ref processor and |
|
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|
968 // empty CM ref processor's discovered lists |
|
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969 // (without processing any entries). |
|
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970 // * Verify that the STW ref processor is inactive and it's |
|
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971 // discovered lists are empty. |
|
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972 // * Temporarily set STW ref processor discovery as single threaded. |
|
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973 // * Temporarily clear the STW ref processor's _is_alive_non_header |
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|
974 // field. |
|
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|
975 // * Finally enable discovery by the STW ref processor. |
|
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|
976 // |
|
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977 // The STW ref processor is used to record any discovered |
|
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|
978 // references during the full GC. |
|
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|
979 // |
|
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|
980 // At the end of a full GC we: |
|
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|
981 // * Enqueue any reference objects discovered by the STW ref processor |
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|
982 // that have non-live referents. This has the side-effect of |
|
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983 // making the STW ref processor inactive by disabling discovery. |
|
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984 // * Verify that the CM ref processor is still inactive |
|
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985 // and no references have been placed on it's discovered |
|
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986 // lists (also checked as a precondition during initial marking). |
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|
987 |
|
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|
988 // The (stw) reference processor... |
|
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|
989 ReferenceProcessor* _ref_processor_stw; |
|
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|
990 |
| 10405 | 991 STWGCTimer* _gc_timer_stw; |
| 992 ConcurrentGCTimer* _gc_timer_cm; | |
| 993 | |
| 994 G1OldTracer* _gc_tracer_cm; | |
| 995 G1NewTracer* _gc_tracer_stw; | |
| 996 | |
|
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997 // During reference object discovery, the _is_alive_non_header |
|
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998 // closure (if non-null) is applied to the referent object to |
|
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|
999 // determine whether the referent is live. If so then the |
|
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|
1000 // reference object does not need to be 'discovered' and can |
|
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|
1001 // be treated as a regular oop. This has the benefit of reducing |
|
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|
1002 // the number of 'discovered' reference objects that need to |
|
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|
1003 // be processed. |
|
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1004 // |
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1005 // Instance of the is_alive closure for embedding into the |
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1006 // STW reference processor as the _is_alive_non_header field. |
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1007 // Supplying a value for the _is_alive_non_header field is |
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1008 // optional but doing so prevents unnecessary additions to |
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1009 // the discovered lists during reference discovery. |
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1010 G1STWIsAliveClosure _is_alive_closure_stw; |
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1011 |
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1012 // The (concurrent marking) reference processor... |
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1013 ReferenceProcessor* _ref_processor_cm; |
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1014 |
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1015 // Instance of the concurrent mark is_alive closure for embedding |
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1016 // into the Concurrent Marking reference processor as the |
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1017 // _is_alive_non_header field. Supplying a value for the |
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1018 // _is_alive_non_header field is optional but doing so prevents |
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1019 // unnecessary additions to the discovered lists during reference |
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1020 // discovery. |
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1021 G1CMIsAliveClosure _is_alive_closure_cm; |
| 342 | 1022 |
|
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1023 // Cache used by G1CollectedHeap::start_cset_region_for_worker(). |
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1024 HeapRegion** _worker_cset_start_region; |
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1025 |
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1026 // Time stamp to validate the regions recorded in the cache |
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1027 // used by G1CollectedHeap::start_cset_region_for_worker(). |
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1028 // The heap region entry for a given worker is valid iff |
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1029 // the associated time stamp value matches the current value |
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1030 // of G1CollectedHeap::_gc_time_stamp. |
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1031 unsigned int* _worker_cset_start_region_time_stamp; |
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1032 |
|
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1033 enum G1H_process_roots_tasks { |
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1034 G1H_PS_filter_satb_buffers, |
| 342 | 1035 G1H_PS_refProcessor_oops_do, |
| 1036 // Leave this one last. | |
| 1037 G1H_PS_NumElements | |
| 1038 }; | |
| 1039 | |
| 1040 SubTasksDone* _process_strong_tasks; | |
| 1041 | |
| 2152 | 1042 volatile bool _free_regions_coming; |
| 342 | 1043 |
| 1044 public: | |
|
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1045 |
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1046 SubTasksDone* process_strong_tasks() { return _process_strong_tasks; } |
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1047 |
| 342 | 1048 void set_refine_cte_cl_concurrency(bool concurrent); |
| 1049 | |
| 1709 | 1050 RefToScanQueue *task_queue(int i) const; |
| 342 | 1051 |
|
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1052 // A set of cards where updates happened during the GC |
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1053 DirtyCardQueueSet& dirty_card_queue_set() { return _dirty_card_queue_set; } |
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1054 |
| 1705 | 1055 // A DirtyCardQueueSet that is used to hold cards that contain |
| 1056 // references into the current collection set. This is used to | |
| 1057 // update the remembered sets of the regions in the collection | |
| 1058 // set in the event of an evacuation failure. | |
| 1059 DirtyCardQueueSet& into_cset_dirty_card_queue_set() | |
| 1060 { return _into_cset_dirty_card_queue_set; } | |
| 1061 | |
| 342 | 1062 // Create a G1CollectedHeap with the specified policy. |
| 1063 // Must call the initialize method afterwards. | |
| 1064 // May not return if something goes wrong. | |
| 1065 G1CollectedHeap(G1CollectorPolicy* policy); | |
| 1066 | |
| 1067 // Initialize the G1CollectedHeap to have the initial and | |
|
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1068 // maximum sizes and remembered and barrier sets |
| 342 | 1069 // specified by the policy object. |
| 1070 jint initialize(); | |
| 1071 | |
|
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1072 virtual void stop(); |
|
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1073 |
|
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1074 // Return the (conservative) maximum heap alignment for any G1 heap |
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1075 static size_t conservative_max_heap_alignment(); |
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1076 |
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1077 // Initialize weak reference processing. |
|
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1078 virtual void ref_processing_init(); |
| 342 | 1079 |
|
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1080 void set_par_threads(uint t) { |
| 342 | 1081 SharedHeap::set_par_threads(t); |
|
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1082 // Done in SharedHeap but oddly there are |
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1083 // two _process_strong_tasks's in a G1CollectedHeap |
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1084 // so do it here too. |
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1085 _process_strong_tasks->set_n_threads(t); |
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1086 } |
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1087 |
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1088 // Set _n_par_threads according to a policy TBD. |
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1089 void set_par_threads(); |
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1090 |
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1091 void set_n_termination(int t) { |
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1092 _process_strong_tasks->set_n_threads(t); |
| 342 | 1093 } |
| 1094 | |
| 1095 virtual CollectedHeap::Name kind() const { | |
| 1096 return CollectedHeap::G1CollectedHeap; | |
| 1097 } | |
| 1098 | |
| 1099 // The current policy object for the collector. | |
| 1100 G1CollectorPolicy* g1_policy() const { return _g1_policy; } | |
| 1101 | |
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1102 virtual CollectorPolicy* collector_policy() const { return (CollectorPolicy*) g1_policy(); } |
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1103 |
| 342 | 1104 // Adaptive size policy. No such thing for g1. |
| 1105 virtual AdaptiveSizePolicy* size_policy() { return NULL; } | |
| 1106 | |
| 1107 // The rem set and barrier set. | |
| 1108 G1RemSet* g1_rem_set() const { return _g1_rem_set; } | |
| 1109 | |
| 1110 unsigned get_gc_time_stamp() { | |
| 1111 return _gc_time_stamp; | |
| 1112 } | |
| 1113 | |
|
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1114 inline void reset_gc_time_stamp(); |
|
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1115 |
|
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1116 void check_gc_time_stamps() PRODUCT_RETURN; |
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1117 |
|
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1118 inline void increment_gc_time_stamp(); |
| 342 | 1119 |
|
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1120 // Reset the given region's GC timestamp. If it's starts humongous, |
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1121 // also reset the GC timestamp of its corresponding |
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1122 // continues humongous regions too. |
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1123 void reset_gc_time_stamps(HeapRegion* hr); |
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1124 |
| 1705 | 1125 void iterate_dirty_card_closure(CardTableEntryClosure* cl, |
| 1126 DirtyCardQueue* into_cset_dcq, | |
|
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1127 bool concurrent, uint worker_i); |
| 342 | 1128 |
| 1129 // The shared block offset table array. | |
| 1130 G1BlockOffsetSharedArray* bot_shared() const { return _bot_shared; } | |
| 1131 | |
|
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1132 // Reference Processing accessors |
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1133 |
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1134 // The STW reference processor.... |
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1135 ReferenceProcessor* ref_processor_stw() const { return _ref_processor_stw; } |
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1136 |
| 10405 | 1137 // The Concurrent Marking reference processor... |
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1138 ReferenceProcessor* ref_processor_cm() const { return _ref_processor_cm; } |
| 342 | 1139 |
| 10405 | 1140 ConcurrentGCTimer* gc_timer_cm() const { return _gc_timer_cm; } |
| 1141 G1OldTracer* gc_tracer_cm() const { return _gc_tracer_cm; } | |
| 1142 | |
| 342 | 1143 virtual size_t capacity() const; |
| 1144 virtual size_t used() const; | |
|
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1145 // This should be called when we're not holding the heap lock. The |
|
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1146 // result might be a bit inaccurate. |
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1147 size_t used_unlocked() const; |
| 342 | 1148 size_t recalculate_used() const; |
| 1149 | |
| 1150 // These virtual functions do the actual allocation. | |
| 1151 // Some heaps may offer a contiguous region for shared non-blocking | |
| 1152 // allocation, via inlined code (by exporting the address of the top and | |
| 1153 // end fields defining the extent of the contiguous allocation region.) | |
| 1154 // But G1CollectedHeap doesn't yet support this. | |
| 1155 | |
| 1156 // Return an estimate of the maximum allocation that could be performed | |
| 1157 // without triggering any collection or expansion activity. In a | |
| 1158 // generational collector, for example, this is probably the largest | |
| 1159 // allocation that could be supported (without expansion) in the youngest | |
| 1160 // generation. It is "unsafe" because no locks are taken; the result | |
| 1161 // should be treated as an approximation, not a guarantee, for use in | |
| 1162 // heuristic resizing decisions. | |
| 1163 virtual size_t unsafe_max_alloc(); | |
| 1164 | |
| 1165 virtual bool is_maximal_no_gc() const { | |
| 1166 return _g1_storage.uncommitted_size() == 0; | |
| 1167 } | |
| 1168 | |
| 1169 // The total number of regions in the heap. | |
|
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1170 uint n_regions() { return _hrs.length(); } |
| 3766 | 1171 |
| 1172 // The max number of regions in the heap. | |
|
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1173 uint max_regions() { return _hrs.max_length(); } |
| 342 | 1174 |
| 1175 // The number of regions that are completely free. | |
|
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1176 uint free_regions() { return _free_list.length(); } |
| 342 | 1177 |
| 1178 // The number of regions that are not completely free. | |
|
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1179 uint used_regions() { return n_regions() - free_regions(); } |
| 342 | 1180 |
| 1181 // The number of regions available for "regular" expansion. | |
|
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1182 uint expansion_regions() { return _expansion_regions; } |
| 342 | 1183 |
| 3766 | 1184 // Factory method for HeapRegion instances. It will return NULL if |
| 1185 // the allocation fails. | |
|
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1186 HeapRegion* new_heap_region(uint hrs_index, HeapWord* bottom); |
| 3766 | 1187 |
|
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1188 void verify_not_dirty_region(HeapRegion* hr) PRODUCT_RETURN; |
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1189 void verify_dirty_region(HeapRegion* hr) PRODUCT_RETURN; |
|
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1190 void verify_dirty_young_list(HeapRegion* head) PRODUCT_RETURN; |
|
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1191 void verify_dirty_young_regions() PRODUCT_RETURN; |
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1192 |
|
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1193 #ifndef PRODUCT |
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1194 // Make sure that the given bitmap has no marked objects in the |
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1195 // range [from,limit). If it does, print an error message and return |
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1196 // false. Otherwise, just return true. bitmap_name should be "prev" |
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1197 // or "next". |
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1198 bool verify_no_bits_over_tams(const char* bitmap_name, CMBitMapRO* bitmap, |
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1199 HeapWord* from, HeapWord* limit); |
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1200 |
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1201 // Verify that the prev / next bitmap range [tams,end) for the given |
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1202 // region has no marks. Return true if all is well, false if errors |
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1203 // are detected. |
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1204 bool verify_bitmaps(const char* caller, HeapRegion* hr); |
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1205 #endif // PRODUCT |
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1206 |
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1207 // If G1VerifyBitmaps is set, verify that the marking bitmaps for |
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1208 // the given region do not have any spurious marks. If errors are |
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1209 // detected, print appropriate error messages and crash. |
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1210 void check_bitmaps(const char* caller, HeapRegion* hr) PRODUCT_RETURN; |
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1211 |
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1212 // If G1VerifyBitmaps is set, verify that the marking bitmaps do not |
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1213 // have any spurious marks. If errors are detected, print |
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1214 // appropriate error messages and crash. |
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1215 void check_bitmaps(const char* caller) PRODUCT_RETURN; |
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1216 |
| 2152 | 1217 // verify_region_sets() performs verification over the region |
| 1218 // lists. It will be compiled in the product code to be used when | |
| 1219 // necessary (i.e., during heap verification). | |
| 1220 void verify_region_sets(); | |
| 342 | 1221 |
| 2152 | 1222 // verify_region_sets_optional() is planted in the code for |
| 1223 // list verification in non-product builds (and it can be enabled in | |
| 10405 | 1224 // product builds by defining HEAP_REGION_SET_FORCE_VERIFY to be 1). |
| 2152 | 1225 #if HEAP_REGION_SET_FORCE_VERIFY |
| 1226 void verify_region_sets_optional() { | |
| 1227 verify_region_sets(); | |
| 1228 } | |
| 1229 #else // HEAP_REGION_SET_FORCE_VERIFY | |
| 1230 void verify_region_sets_optional() { } | |
| 1231 #endif // HEAP_REGION_SET_FORCE_VERIFY | |
| 342 | 1232 |
| 2152 | 1233 #ifdef ASSERT |
| 2361 | 1234 bool is_on_master_free_list(HeapRegion* hr) { |
| 2152 | 1235 return hr->containing_set() == &_free_list; |
| 1236 } | |
| 1237 #endif // ASSERT | |
| 342 | 1238 |
| 2152 | 1239 // Wrapper for the region list operations that can be called from |
| 1240 // methods outside this class. | |
| 342 | 1241 |
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1242 void secondary_free_list_add(FreeRegionList* list) { |
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1243 _secondary_free_list.add_ordered(list); |
| 2152 | 1244 } |
| 342 | 1245 |
| 2152 | 1246 void append_secondary_free_list() { |
|
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1247 _free_list.add_ordered(&_secondary_free_list); |
| 2152 | 1248 } |
| 342 | 1249 |
| 2361 | 1250 void append_secondary_free_list_if_not_empty_with_lock() { |
| 1251 // If the secondary free list looks empty there's no reason to | |
| 1252 // take the lock and then try to append it. | |
| 2152 | 1253 if (!_secondary_free_list.is_empty()) { |
| 1254 MutexLockerEx x(SecondaryFreeList_lock, Mutex::_no_safepoint_check_flag); | |
| 1255 append_secondary_free_list(); | |
| 1256 } | |
| 1257 } | |
| 342 | 1258 |
|
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1259 inline void old_set_remove(HeapRegion* hr); |
| 4072 | 1260 |
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1261 size_t non_young_capacity_bytes() { |
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1262 return _old_set.total_capacity_bytes() + _humongous_set.total_capacity_bytes(); |
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1263 } |
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1264 |
| 2152 | 1265 void set_free_regions_coming(); |
| 1266 void reset_free_regions_coming(); | |
| 1267 bool free_regions_coming() { return _free_regions_coming; } | |
| 1268 void wait_while_free_regions_coming(); | |
| 342 | 1269 |
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1270 // Determine whether the given region is one that we are using as an |
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1271 // old GC alloc region. |
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1272 bool is_old_gc_alloc_region(HeapRegion* hr) { |
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1273 return hr == _retained_old_gc_alloc_region; |
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1274 } |
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1275 |
| 342 | 1276 // Perform a collection of the heap; intended for use in implementing |
| 1277 // "System.gc". This probably implies as full a collection as the | |
| 1278 // "CollectedHeap" supports. | |
| 1279 virtual void collect(GCCause::Cause cause); | |
| 1280 | |
| 1281 // The same as above but assume that the caller holds the Heap_lock. | |
| 1282 void collect_locked(GCCause::Cause cause); | |
| 1283 | |
| 10405 | 1284 // True iff an evacuation has failed in the most-recent collection. |
| 342 | 1285 bool evacuation_failed() { return _evacuation_failed; } |
| 1286 | |
|
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1287 void remove_from_old_sets(const HeapRegionSetCount& old_regions_removed, const HeapRegionSetCount& humongous_regions_removed); |
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1288 void prepend_to_freelist(FreeRegionList* list); |
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1289 void decrement_summary_bytes(size_t bytes); |
| 342 | 1290 |
| 4708 | 1291 // Returns "TRUE" iff "p" points into the committed areas of the heap. |
| 342 | 1292 virtual bool is_in(const void* p) const; |
| 1293 | |
| 1294 // Return "TRUE" iff the given object address is within the collection | |
| 1295 // set. | |
| 1296 inline bool obj_in_cs(oop obj); | |
| 1297 | |
| 1298 // Return "TRUE" iff the given object address is in the reserved | |
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1299 // region of g1. |
| 342 | 1300 bool is_in_g1_reserved(const void* p) const { |
| 1301 return _g1_reserved.contains(p); | |
| 1302 } | |
| 1303 | |
|
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1304 // Returns a MemRegion that corresponds to the space that has been |
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1305 // reserved for the heap |
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1306 MemRegion g1_reserved() { |
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1307 return _g1_reserved; |
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1308 } |
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1309 |
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1310 // Returns a MemRegion that corresponds to the space that has been |
| 342 | 1311 // committed in the heap |
| 1312 MemRegion g1_committed() { | |
| 1313 return _g1_committed; | |
| 1314 } | |
| 1315 | |
| 2311 | 1316 virtual bool is_in_closed_subset(const void* p) const; |
| 342 | 1317 |
| 12343 | 1318 G1SATBCardTableModRefBS* g1_barrier_set() { |
| 1319 return (G1SATBCardTableModRefBS*) barrier_set(); | |
| 1320 } | |
| 1321 | |
| 342 | 1322 // This resets the card table to all zeros. It is used after |
| 1323 // a collection pause which used the card table to claim cards. | |
| 1324 void cleanUpCardTable(); | |
| 1325 | |
| 1326 // Iteration functions. | |
| 1327 | |
| 1328 // Iterate over all the ref-containing fields of all objects, calling | |
| 1329 // "cl.do_oop" on each. | |
|
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1330 virtual void oop_iterate(ExtendedOopClosure* cl); |
| 342 | 1331 |
| 1332 // Same as above, restricted to a memory region. | |
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1333 void oop_iterate(MemRegion mr, ExtendedOopClosure* cl); |
| 342 | 1334 |
| 1335 // Iterate over all objects, calling "cl.do_object" on each. | |
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1336 virtual void object_iterate(ObjectClosure* cl); |
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1337 |
| 678 | 1338 virtual void safe_object_iterate(ObjectClosure* cl) { |
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1339 object_iterate(cl); |
| 678 | 1340 } |
| 342 | 1341 |
| 1342 // Iterate over all spaces in use in the heap, in ascending address order. | |
| 1343 virtual void space_iterate(SpaceClosure* cl); | |
| 1344 | |
| 1345 // Iterate over heap regions, in address order, terminating the | |
| 1346 // iteration early if the "doHeapRegion" method returns "true". | |
| 3766 | 1347 void heap_region_iterate(HeapRegionClosure* blk) const; |
| 342 | 1348 |
| 3766 | 1349 // Return the region with the given index. It assumes the index is valid. |
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1350 inline HeapRegion* region_at(uint index) const; |
| 342 | 1351 |
| 1352 // Divide the heap region sequence into "chunks" of some size (the number | |
| 1353 // of regions divided by the number of parallel threads times some | |
| 1354 // overpartition factor, currently 4). Assumes that this will be called | |
| 1355 // in parallel by ParallelGCThreads worker threads with discinct worker | |
| 1356 // ids in the range [0..max(ParallelGCThreads-1, 1)], that all parallel | |
| 1357 // calls will use the same "claim_value", and that that claim value is | |
| 1358 // different from the claim_value of any heap region before the start of | |
| 1359 // the iteration. Applies "blk->doHeapRegion" to each of the regions, by | |
| 1360 // attempting to claim the first region in each chunk, and, if | |
| 1361 // successful, applying the closure to each region in the chunk (and | |
| 1362 // setting the claim value of the second and subsequent regions of the | |
| 1363 // chunk.) For now requires that "doHeapRegion" always returns "false", | |
| 1364 // i.e., that a closure never attempt to abort a traversal. | |
| 1365 void heap_region_par_iterate_chunked(HeapRegionClosure* blk, | |
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1366 uint worker, |
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1367 uint no_of_par_workers, |
| 342 | 1368 jint claim_value); |
| 1369 | |
| 390 | 1370 // It resets all the region claim values to the default. |
| 1371 void reset_heap_region_claim_values(); | |
| 1372 | |
|
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1373 // Resets the claim values of regions in the current |
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1374 // collection set to the default. |
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1375 void reset_cset_heap_region_claim_values(); |
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1376 |
| 355 | 1377 #ifdef ASSERT |
| 1378 bool check_heap_region_claim_values(jint claim_value); | |
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1379 |
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1380 // Same as the routine above but only checks regions in the |
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1381 // current collection set. |
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1382 bool check_cset_heap_region_claim_values(jint claim_value); |
| 355 | 1383 #endif // ASSERT |
| 1384 | |
|
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1385 // Clear the cached cset start regions and (more importantly) |
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1386 // the time stamps. Called when we reset the GC time stamp. |
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1387 void clear_cset_start_regions(); |
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1388 |
|
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1389 // Given the id of a worker, obtain or calculate a suitable |
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1390 // starting region for iterating over the current collection set. |
|
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1391 HeapRegion* start_cset_region_for_worker(uint worker_i); |
|
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1392 |
|
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1393 // This is a convenience method that is used by the |
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1394 // HeapRegionIterator classes to calculate the starting region for |
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1395 // each worker so that they do not all start from the same region. |
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1396 HeapRegion* start_region_for_worker(uint worker_i, uint no_of_par_workers); |
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1397 |
| 342 | 1398 // Iterate over the regions (if any) in the current collection set. |
| 1399 void collection_set_iterate(HeapRegionClosure* blk); | |
| 1400 | |
| 1401 // As above but starting from region r | |
| 1402 void collection_set_iterate_from(HeapRegion* r, HeapRegionClosure *blk); | |
| 1403 | |
| 1404 // Returns the first (lowest address) compactible space in the heap. | |
| 1405 virtual CompactibleSpace* first_compactible_space(); | |
| 1406 | |
| 1407 // A CollectedHeap will contain some number of spaces. This finds the | |
| 1408 // space containing a given address, or else returns NULL. | |
| 1409 virtual Space* space_containing(const void* addr) const; | |
| 1410 | |
| 1411 // A G1CollectedHeap will contain some number of heap regions. This | |
| 1412 // finds the region containing a given address, or else returns NULL. | |
| 3766 | 1413 template <class T> |
| 1414 inline HeapRegion* heap_region_containing(const T addr) const; | |
| 342 | 1415 |
| 1416 // Like the above, but requires "addr" to be in the heap (to avoid a | |
| 1417 // null-check), and unlike the above, may return an continuing humongous | |
| 1418 // region. | |
| 3766 | 1419 template <class T> |
| 1420 inline HeapRegion* heap_region_containing_raw(const T addr) const; | |
| 342 | 1421 |
| 1422 // A CollectedHeap is divided into a dense sequence of "blocks"; that is, | |
| 1423 // each address in the (reserved) heap is a member of exactly | |
| 1424 // one block. The defining characteristic of a block is that it is | |
| 1425 // possible to find its size, and thus to progress forward to the next | |
| 1426 // block. (Blocks may be of different sizes.) Thus, blocks may | |
| 1427 // represent Java objects, or they might be free blocks in a | |
| 1428 // free-list-based heap (or subheap), as long as the two kinds are | |
| 1429 // distinguishable and the size of each is determinable. | |
| 1430 | |
| 1431 // Returns the address of the start of the "block" that contains the | |
| 1432 // address "addr". We say "blocks" instead of "object" since some heaps | |
| 1433 // may not pack objects densely; a chunk may either be an object or a | |
| 1434 // non-object. | |
| 1435 virtual HeapWord* block_start(const void* addr) const; | |
| 1436 | |
| 1437 // Requires "addr" to be the start of a chunk, and returns its size. | |
| 1438 // "addr + size" is required to be the start of a new chunk, or the end | |
| 1439 // of the active area of the heap. | |
| 1440 virtual size_t block_size(const HeapWord* addr) const; | |
| 1441 | |
| 1442 // Requires "addr" to be the start of a block, and returns "TRUE" iff | |
| 1443 // the block is an object. | |
| 1444 virtual bool block_is_obj(const HeapWord* addr) const; | |
| 1445 | |
| 1446 // Does this heap support heap inspection? (+PrintClassHistogram) | |
| 1447 virtual bool supports_heap_inspection() const { return true; } | |
| 1448 | |
| 1449 // Section on thread-local allocation buffers (TLABs) | |
| 1450 // See CollectedHeap for semantics. | |
| 1451 | |
| 17727 | 1452 bool supports_tlab_allocation() const; |
| 1453 size_t tlab_capacity(Thread* ignored) const; | |
| 1454 size_t tlab_used(Thread* ignored) const; | |
| 1455 size_t max_tlab_size() const; | |
| 1456 size_t unsafe_max_tlab_alloc(Thread* ignored) const; | |
| 342 | 1457 |
| 1458 // Can a compiler initialize a new object without store barriers? | |
| 1459 // This permission only extends from the creation of a new object | |
|
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1460 // via a TLAB up to the first subsequent safepoint. If such permission |
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1461 // is granted for this heap type, the compiler promises to call |
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1462 // defer_store_barrier() below on any slow path allocation of |
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1463 // a new object for which such initializing store barriers will |
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1464 // have been elided. G1, like CMS, allows this, but should be |
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1465 // ready to provide a compensating write barrier as necessary |
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1466 // if that storage came out of a non-young region. The efficiency |
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1467 // of this implementation depends crucially on being able to |
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1468 // answer very efficiently in constant time whether a piece of |
|
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1469 // storage in the heap comes from a young region or not. |
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1470 // See ReduceInitialCardMarks. |
| 342 | 1471 virtual bool can_elide_tlab_store_barriers() const { |
|
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1472 return true; |
|
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1473 } |
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1474 |
| 1166 | 1475 virtual bool card_mark_must_follow_store() const { |
| 1476 return true; | |
| 1477 } | |
| 1478 | |
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1479 inline bool is_in_young(const oop obj); |
|
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1480 |
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1481 #ifdef ASSERT |
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1482 virtual bool is_in_partial_collection(const void* p); |
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1483 #endif |
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1484 |
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1485 virtual bool is_scavengable(const void* addr); |
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1486 |
|
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1487 // We don't need barriers for initializing stores to objects |
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1488 // in the young gen: for the SATB pre-barrier, there is no |
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1489 // pre-value that needs to be remembered; for the remembered-set |
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1490 // update logging post-barrier, we don't maintain remembered set |
|
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1491 // information for young gen objects. |
|
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1492 virtual inline bool can_elide_initializing_store_barrier(oop new_obj); |
| 342 | 1493 |
| 1494 // Returns "true" iff the given word_size is "very large". | |
| 1495 static bool isHumongous(size_t word_size) { | |
|
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1496 // Note this has to be strictly greater-than as the TLABs |
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1497 // are capped at the humongous thresold and we want to |
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1498 // ensure that we don't try to allocate a TLAB as |
|
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1499 // humongous and that we don't allocate a humongous |
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1500 // object in a TLAB. |
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|
1501 return word_size > _humongous_object_threshold_in_words; |
| 342 | 1502 } |
| 1503 | |
| 1504 // Update mod union table with the set of dirty cards. | |
| 1505 void updateModUnion(); | |
| 1506 | |
| 1507 // Set the mod union bits corresponding to the given memRegion. Note | |
| 1508 // that this is always a safe operation, since it doesn't clear any | |
| 1509 // bits. | |
| 1510 void markModUnionRange(MemRegion mr); | |
| 1511 | |
| 1512 // Records the fact that a marking phase is no longer in progress. | |
| 1513 void set_marking_complete() { | |
| 1514 _mark_in_progress = false; | |
| 1515 } | |
| 1516 void set_marking_started() { | |
| 1517 _mark_in_progress = true; | |
| 1518 } | |
| 1519 bool mark_in_progress() { | |
| 1520 return _mark_in_progress; | |
| 1521 } | |
| 1522 | |
| 1523 // Print the maximum heap capacity. | |
| 1524 virtual size_t max_capacity() const; | |
| 1525 | |
| 1526 virtual jlong millis_since_last_gc(); | |
| 1527 | |
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1528 |
| 342 | 1529 // Convenience function to be used in situations where the heap type can be |
| 1530 // asserted to be this type. | |
| 1531 static G1CollectedHeap* heap(); | |
| 1532 | |
| 1533 void set_region_short_lived_locked(HeapRegion* hr); | |
| 1534 // add appropriate methods for any other surv rate groups | |
| 1535 | |
| 17727 | 1536 YoungList* young_list() const { return _young_list; } |
| 342 | 1537 |
| 1538 // debugging | |
| 1539 bool check_young_list_well_formed() { | |
| 1540 return _young_list->check_list_well_formed(); | |
| 1541 } | |
|
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1542 |
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1543 bool check_young_list_empty(bool check_heap, |
| 342 | 1544 bool check_sample = true); |
| 1545 | |
| 1546 // *** Stuff related to concurrent marking. It's not clear to me that so | |
| 1547 // many of these need to be public. | |
| 1548 | |
| 1549 // The functions below are helper functions that a subclass of | |
| 1550 // "CollectedHeap" can use in the implementation of its virtual | |
| 1551 // functions. | |
| 1552 // This performs a concurrent marking of the live objects in a | |
| 1553 // bitmap off to the side. | |
| 1554 void doConcurrentMark(); | |
| 1555 | |
| 1556 bool isMarkedPrev(oop obj) const; | |
| 1557 bool isMarkedNext(oop obj) const; | |
| 1558 | |
| 1559 // Determine if an object is dead, given the object and also | |
| 1560 // the region to which the object belongs. An object is dead | |
| 1561 // iff a) it was not allocated since the last mark and b) it | |
| 1562 // is not marked. | |
| 1563 | |
| 1564 bool is_obj_dead(const oop obj, const HeapRegion* hr) const { | |
| 1565 return | |
| 1566 !hr->obj_allocated_since_prev_marking(obj) && | |
| 1567 !isMarkedPrev(obj); | |
| 1568 } | |
| 1569 | |
| 1570 // This function returns true when an object has been | |
| 1571 // around since the previous marking and hasn't yet | |
| 1572 // been marked during this marking. | |
| 1573 | |
| 1574 bool is_obj_ill(const oop obj, const HeapRegion* hr) const { | |
| 1575 return | |
| 1576 !hr->obj_allocated_since_next_marking(obj) && | |
| 1577 !isMarkedNext(obj); | |
| 1578 } | |
| 1579 | |
| 1580 // Determine if an object is dead, given only the object itself. | |
| 1581 // This will find the region to which the object belongs and | |
| 1582 // then call the region version of the same function. | |
| 1583 | |
| 1584 // Added if it is NULL it isn't dead. | |
| 1585 | |
|
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1586 inline bool is_obj_dead(const oop obj) const; |
| 342 | 1587 |
|
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1588 inline bool is_obj_ill(const oop obj) const; |
| 342 | 1589 |
| 12080 | 1590 bool allocated_since_marking(oop obj, HeapRegion* hr, VerifyOption vo); |
| 1591 HeapWord* top_at_mark_start(HeapRegion* hr, VerifyOption vo); | |
| 1592 bool is_marked(oop obj, VerifyOption vo); | |
| 1593 const char* top_at_mark_start_str(VerifyOption vo); | |
| 1594 | |
| 1595 ConcurrentMark* concurrent_mark() const { return _cm; } | |
| 1596 | |
| 1597 // Refinement | |
| 1598 | |
| 1599 ConcurrentG1Refine* concurrent_g1_refine() const { return _cg1r; } | |
| 1600 | |
| 1601 // The dirty cards region list is used to record a subset of regions | |
| 1602 // whose cards need clearing. The list if populated during the | |
| 1603 // remembered set scanning and drained during the card table | |
| 1604 // cleanup. Although the methods are reentrant, population/draining | |
| 1605 // phases must not overlap. For synchronization purposes the last | |
| 1606 // element on the list points to itself. | |
| 1607 HeapRegion* _dirty_cards_region_list; | |
| 1608 void push_dirty_cards_region(HeapRegion* hr); | |
| 1609 HeapRegion* pop_dirty_cards_region(); | |
| 1610 | |
| 1611 // Optimized nmethod scanning support routines | |
| 1612 | |
| 1613 // Register the given nmethod with the G1 heap | |
| 1614 virtual void register_nmethod(nmethod* nm); | |
| 1615 | |
| 1616 // Unregister the given nmethod from the G1 heap | |
| 1617 virtual void unregister_nmethod(nmethod* nm); | |
| 1618 | |
| 1619 // Migrate the nmethods in the code root lists of the regions | |
| 1620 // in the collection set to regions in to-space. In the event | |
| 1621 // of an evacuation failure, nmethods that reference objects | |
| 1622 // that were not successfullly evacuated are not migrated. | |
| 1623 void migrate_strong_code_roots(); | |
| 1624 | |
|
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1625 // Free up superfluous code root memory. |
|
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|
1626 void purge_code_root_memory(); |
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|
1627 |
| 12080 | 1628 // Rebuild the stong code root lists for each region |
| 1629 // after a full GC | |
| 1630 void rebuild_strong_code_roots(); | |
| 1631 | |
|
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1632 // Delete entries for dead interned string and clean up unreferenced symbols |
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1633 // in symbol table, possibly in parallel. |
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1634 void unlink_string_and_symbol_table(BoolObjectClosure* is_alive, bool unlink_strings = true, bool unlink_symbols = true); |
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|
1635 |
|
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1636 // Parallel phase of unloading/cleaning after G1 concurrent mark. |
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1637 void parallel_cleaning(BoolObjectClosure* is_alive, bool process_strings, bool process_symbols, bool class_unloading_occurred); |
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1638 |
|
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1639 // Redirty logged cards in the refinement queue. |
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1640 void redirty_logged_cards(); |
| 12080 | 1641 // Verification |
| 1642 | |
| 1643 // The following is just to alert the verification code | |
| 1644 // that a full collection has occurred and that the | |
| 1645 // remembered sets are no longer up to date. | |
| 1646 bool _full_collection; | |
| 1647 void set_full_collection() { _full_collection = true;} | |
| 1648 void clear_full_collection() {_full_collection = false;} | |
| 1649 bool full_collection() {return _full_collection;} | |
| 1650 | |
| 1651 // Perform any cleanup actions necessary before allowing a verification. | |
| 1652 virtual void prepare_for_verify(); | |
| 1653 | |
| 1654 // Perform verification. | |
| 1655 | |
| 1656 // vo == UsePrevMarking -> use "prev" marking information, | |
| 1657 // vo == UseNextMarking -> use "next" marking information | |
| 1658 // vo == UseMarkWord -> use the mark word in the object header | |
| 1659 // | |
| 1660 // NOTE: Only the "prev" marking information is guaranteed to be | |
| 1661 // consistent most of the time, so most calls to this should use | |
| 1662 // vo == UsePrevMarking. | |
| 1663 // Currently, there is only one case where this is called with | |
| 1664 // vo == UseNextMarking, which is to verify the "next" marking | |
| 1665 // information at the end of remark. | |
| 1666 // Currently there is only one place where this is called with | |
| 1667 // vo == UseMarkWord, which is to verify the marking during a | |
| 1668 // full GC. | |
| 1669 void verify(bool silent, VerifyOption vo); | |
| 1670 | |
| 1671 // Override; it uses the "prev" marking information | |
| 1672 virtual void verify(bool silent); | |
| 1673 | |
|
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1674 // The methods below are here for convenience and dispatch the |
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1675 // appropriate method depending on value of the given VerifyOption |
| 12080 | 1676 // parameter. The values for that parameter, and their meanings, |
| 1677 // are the same as those above. | |
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1678 |
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1679 bool is_obj_dead_cond(const oop obj, |
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1680 const HeapRegion* hr, |
|
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1681 const VerifyOption vo) const; |
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1682 |
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1683 bool is_obj_dead_cond(const oop obj, |
|
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1684 const VerifyOption vo) const; |
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1685 |
| 12080 | 1686 // Printing |
|
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1687 |
| 12080 | 1688 virtual void print_on(outputStream* st) const; |
| 1689 virtual void print_extended_on(outputStream* st) const; | |
| 1690 virtual void print_on_error(outputStream* st) const; | |
| 342 | 1691 |
| 12080 | 1692 virtual void print_gc_threads_on(outputStream* st) const; |
| 1693 virtual void gc_threads_do(ThreadClosure* tc) const; | |
| 342 | 1694 |
| 12080 | 1695 // Override |
| 1696 void print_tracing_info() const; | |
| 1697 | |
| 1698 // The following two methods are helpful for debugging RSet issues. | |
| 1699 void print_cset_rsets() PRODUCT_RETURN; | |
| 1700 void print_all_rsets() PRODUCT_RETURN; | |
|
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1701 |
| 342 | 1702 public: |
| 1703 size_t pending_card_num(); | |
| 1704 size_t cards_scanned(); | |
| 1705 | |
| 1706 protected: | |
| 1707 size_t _max_heap_capacity; | |
| 1708 }; | |
| 1709 | |
|
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1710 class G1ParGCAllocBuffer: public ParGCAllocBuffer { |
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1711 private: |
|
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|
1712 bool _retired; |
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1713 |
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1714 public: |
|
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1715 G1ParGCAllocBuffer(size_t gclab_word_size); |
|
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1716 virtual ~G1ParGCAllocBuffer() { |
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1717 guarantee(_retired, "Allocation buffer has not been retired"); |
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1718 } |
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1719 |
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1720 virtual void set_buf(HeapWord* buf) { |
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1721 ParGCAllocBuffer::set_buf(buf); |
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1722 _retired = false; |
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1723 } |
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1724 |
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1725 virtual void retire(bool end_of_gc, bool retain) { |
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1726 if (_retired) { |
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1727 return; |
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1728 } |
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1729 ParGCAllocBuffer::retire(end_of_gc, retain); |
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1730 _retired = true; |
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1731 } |
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1732 }; |
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1733 |
| 1972 | 1734 #endif // SHARE_VM_GC_IMPLEMENTATION_G1_G1COLLECTEDHEAP_HPP |