Mercurial > hg > truffle
annotate src/share/vm/gc_implementation/g1/g1CollectedHeap.hpp @ 11096:71180a6e5080
7133260: AllocationProfiler uses space in metadata and doesn't seem to do anything useful.
Summary: Remove -Xaprof and Klass::_alloc_count & ArrayKlass::_alloc_size.
Reviewed-by: stefank, coleenp
| author | jiangli |
|---|---|
| date | Wed, 03 Jul 2013 17:26:59 -0400 |
| parents | f2110083203d |
| children | 6b0fd0964b87 5888334c9c24 |
| rev | line source |
|---|---|
| 342 | 1 /* |
| 10405 | 2 * Copyright (c) 2001, 2013, Oracle and/or its affiliates. All rights reserved. |
| 342 | 3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
| 4 * | |
| 5 * This code is free software; you can redistribute it and/or modify it | |
| 6 * under the terms of the GNU General Public License version 2 only, as | |
| 7 * published by the Free Software Foundation. | |
| 8 * | |
| 9 * This code is distributed in the hope that it will be useful, but WITHOUT | |
| 10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or | |
| 11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License | |
| 12 * version 2 for more details (a copy is included in the LICENSE file that | |
| 13 * accompanied this code). | |
| 14 * | |
| 15 * You should have received a copy of the GNU General Public License version | |
| 16 * 2 along with this work; if not, write to the Free Software Foundation, | |
| 17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. | |
| 18 * | |
|
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19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
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20 * or visit www.oracle.com if you need additional information or have any |
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21 * questions. |
| 342 | 22 * |
| 23 */ | |
| 24 | |
| 1972 | 25 #ifndef SHARE_VM_GC_IMPLEMENTATION_G1_G1COLLECTEDHEAP_HPP |
| 26 #define SHARE_VM_GC_IMPLEMENTATION_G1_G1COLLECTEDHEAP_HPP | |
| 27 | |
| 28 #include "gc_implementation/g1/concurrentMark.hpp" | |
| 10405 | 29 #include "gc_implementation/g1/evacuationInfo.hpp" |
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30 #include "gc_implementation/g1/g1AllocRegion.hpp" |
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31 #include "gc_implementation/g1/g1HRPrinter.hpp" |
| 10405 | 32 #include "gc_implementation/g1/g1MonitoringSupport.hpp" |
| 1972 | 33 #include "gc_implementation/g1/g1RemSet.hpp" |
| 10405 | 34 #include "gc_implementation/g1/g1YCTypes.hpp" |
| 3766 | 35 #include "gc_implementation/g1/heapRegionSeq.hpp" |
| 2152 | 36 #include "gc_implementation/g1/heapRegionSets.hpp" |
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37 #include "gc_implementation/shared/hSpaceCounters.hpp" |
| 6595 | 38 #include "gc_implementation/shared/parGCAllocBuffer.hpp" |
| 1972 | 39 #include "memory/barrierSet.hpp" |
| 40 #include "memory/memRegion.hpp" | |
| 41 #include "memory/sharedHeap.hpp" | |
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42 #include "utilities/stack.hpp" |
| 1972 | 43 |
| 342 | 44 // A "G1CollectedHeap" is an implementation of a java heap for HotSpot. |
| 45 // It uses the "Garbage First" heap organization and algorithm, which | |
| 46 // may combine concurrent marking with parallel, incremental compaction of | |
| 47 // heap subsets that will yield large amounts of garbage. | |
| 48 | |
| 49 class HeapRegion; | |
| 2173 | 50 class HRRSCleanupTask; |
| 342 | 51 class GenerationSpec; |
| 52 class OopsInHeapRegionClosure; | |
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53 class G1KlassScanClosure; |
| 342 | 54 class G1ScanHeapEvacClosure; |
| 55 class ObjectClosure; | |
| 56 class SpaceClosure; | |
| 57 class CompactibleSpaceClosure; | |
| 58 class Space; | |
| 59 class G1CollectorPolicy; | |
| 60 class GenRemSet; | |
| 61 class G1RemSet; | |
| 62 class HeapRegionRemSetIterator; | |
| 63 class ConcurrentMark; | |
| 64 class ConcurrentMarkThread; | |
| 65 class ConcurrentG1Refine; | |
| 10405 | 66 class ConcurrentGCTimer; |
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67 class GenerationCounters; |
| 10405 | 68 class STWGCTimer; |
| 69 class G1NewTracer; | |
| 70 class G1OldTracer; | |
| 71 class EvacuationFailedInfo; | |
| 342 | 72 |
| 6197 | 73 typedef OverflowTaskQueue<StarTask, mtGC> RefToScanQueue; |
| 74 typedef GenericTaskQueueSet<RefToScanQueue, mtGC> RefToScanQueueSet; | |
| 342 | 75 |
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76 typedef int RegionIdx_t; // needs to hold [ 0..max_regions() ) |
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77 typedef int CardIdx_t; // needs to hold [ 0..CardsPerRegion ) |
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78 |
| 342 | 79 enum GCAllocPurpose { |
| 80 GCAllocForTenured, | |
| 81 GCAllocForSurvived, | |
| 82 GCAllocPurposeCount | |
| 83 }; | |
| 84 | |
| 6197 | 85 class YoungList : public CHeapObj<mtGC> { |
| 342 | 86 private: |
| 87 G1CollectedHeap* _g1h; | |
| 88 | |
| 89 HeapRegion* _head; | |
| 90 | |
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91 HeapRegion* _survivor_head; |
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92 HeapRegion* _survivor_tail; |
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93 |
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94 HeapRegion* _curr; |
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95 |
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96 uint _length; |
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97 uint _survivor_length; |
| 342 | 98 |
| 99 size_t _last_sampled_rs_lengths; | |
| 100 size_t _sampled_rs_lengths; | |
| 101 | |
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102 void empty_list(HeapRegion* list); |
| 342 | 103 |
| 104 public: | |
| 105 YoungList(G1CollectedHeap* g1h); | |
| 106 | |
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107 void push_region(HeapRegion* hr); |
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108 void add_survivor_region(HeapRegion* hr); |
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109 |
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110 void empty_list(); |
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111 bool is_empty() { return _length == 0; } |
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112 uint length() { return _length; } |
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113 uint survivor_length() { return _survivor_length; } |
| 342 | 114 |
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115 // Currently we do not keep track of the used byte sum for the |
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116 // young list and the survivors and it'd be quite a lot of work to |
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117 // do so. When we'll eventually replace the young list with |
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118 // instances of HeapRegionLinkedList we'll get that for free. So, |
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119 // we'll report the more accurate information then. |
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120 size_t eden_used_bytes() { |
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121 assert(length() >= survivor_length(), "invariant"); |
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122 return (size_t) (length() - survivor_length()) * HeapRegion::GrainBytes; |
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123 } |
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124 size_t survivor_used_bytes() { |
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125 return (size_t) survivor_length() * HeapRegion::GrainBytes; |
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126 } |
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127 |
| 342 | 128 void rs_length_sampling_init(); |
| 129 bool rs_length_sampling_more(); | |
| 130 void rs_length_sampling_next(); | |
| 131 | |
| 132 void reset_sampled_info() { | |
| 133 _last_sampled_rs_lengths = 0; | |
| 134 } | |
| 135 size_t sampled_rs_lengths() { return _last_sampled_rs_lengths; } | |
| 136 | |
| 137 // for development purposes | |
| 138 void reset_auxilary_lists(); | |
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139 void clear() { _head = NULL; _length = 0; } |
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140 |
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141 void clear_survivors() { |
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142 _survivor_head = NULL; |
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143 _survivor_tail = NULL; |
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144 _survivor_length = 0; |
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145 } |
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146 |
| 342 | 147 HeapRegion* first_region() { return _head; } |
| 148 HeapRegion* first_survivor_region() { return _survivor_head; } | |
| 545 | 149 HeapRegion* last_survivor_region() { return _survivor_tail; } |
| 342 | 150 |
| 151 // debugging | |
| 152 bool check_list_well_formed(); | |
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153 bool check_list_empty(bool check_sample = true); |
| 342 | 154 void print(); |
| 155 }; | |
| 156 | |
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157 class MutatorAllocRegion : public G1AllocRegion { |
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158 protected: |
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159 virtual HeapRegion* allocate_new_region(size_t word_size, bool force); |
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160 virtual void retire_region(HeapRegion* alloc_region, size_t allocated_bytes); |
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161 public: |
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162 MutatorAllocRegion() |
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163 : G1AllocRegion("Mutator Alloc Region", false /* bot_updates */) { } |
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164 }; |
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165 |
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166 // The G1 STW is alive closure. |
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167 // An instance is embedded into the G1CH and used as the |
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168 // (optional) _is_alive_non_header closure in the STW |
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169 // reference processor. It is also extensively used during |
| 10405 | 170 // reference processing during STW evacuation pauses. |
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171 class G1STWIsAliveClosure: public BoolObjectClosure { |
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172 G1CollectedHeap* _g1; |
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173 public: |
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174 G1STWIsAliveClosure(G1CollectedHeap* g1) : _g1(g1) {} |
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175 bool do_object_b(oop p); |
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176 }; |
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177 |
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178 class SurvivorGCAllocRegion : public G1AllocRegion { |
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179 protected: |
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180 virtual HeapRegion* allocate_new_region(size_t word_size, bool force); |
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181 virtual void retire_region(HeapRegion* alloc_region, size_t allocated_bytes); |
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182 public: |
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183 SurvivorGCAllocRegion() |
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184 : G1AllocRegion("Survivor GC Alloc Region", false /* bot_updates */) { } |
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185 }; |
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186 |
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187 class OldGCAllocRegion : public G1AllocRegion { |
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188 protected: |
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189 virtual HeapRegion* allocate_new_region(size_t word_size, bool force); |
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190 virtual void retire_region(HeapRegion* alloc_region, size_t allocated_bytes); |
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191 public: |
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192 OldGCAllocRegion() |
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193 : G1AllocRegion("Old GC Alloc Region", true /* bot_updates */) { } |
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194 }; |
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195 |
| 342 | 196 class RefineCardTableEntryClosure; |
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197 |
| 342 | 198 class G1CollectedHeap : public SharedHeap { |
| 199 friend class VM_G1CollectForAllocation; | |
| 200 friend class VM_G1CollectFull; | |
| 201 friend class VM_G1IncCollectionPause; | |
| 202 friend class VMStructs; | |
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203 friend class MutatorAllocRegion; |
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204 friend class SurvivorGCAllocRegion; |
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205 friend class OldGCAllocRegion; |
| 342 | 206 |
| 207 // Closures used in implementation. | |
| 5987 | 208 template <bool do_gen_barrier, G1Barrier barrier, bool do_mark_object> |
| 209 friend class G1ParCopyClosure; | |
| 342 | 210 friend class G1IsAliveClosure; |
| 211 friend class G1EvacuateFollowersClosure; | |
| 212 friend class G1ParScanThreadState; | |
| 213 friend class G1ParScanClosureSuper; | |
| 214 friend class G1ParEvacuateFollowersClosure; | |
| 215 friend class G1ParTask; | |
| 216 friend class G1FreeGarbageRegionClosure; | |
| 217 friend class RefineCardTableEntryClosure; | |
| 218 friend class G1PrepareCompactClosure; | |
| 219 friend class RegionSorter; | |
| 2152 | 220 friend class RegionResetter; |
| 342 | 221 friend class CountRCClosure; |
| 222 friend class EvacPopObjClosure; | |
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223 friend class G1ParCleanupCTTask; |
| 342 | 224 |
| 225 // Other related classes. | |
| 226 friend class G1MarkSweep; | |
| 227 | |
| 228 private: | |
| 229 // The one and only G1CollectedHeap, so static functions can find it. | |
| 230 static G1CollectedHeap* _g1h; | |
| 231 | |
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232 static size_t _humongous_object_threshold_in_words; |
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233 |
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234 // Storage for the G1 heap. |
| 342 | 235 VirtualSpace _g1_storage; |
| 236 MemRegion _g1_reserved; | |
| 237 | |
| 238 // The part of _g1_storage that is currently committed. | |
| 239 MemRegion _g1_committed; | |
| 240 | |
| 2152 | 241 // The master free list. It will satisfy all new region allocations. |
| 242 MasterFreeRegionList _free_list; | |
| 243 | |
| 244 // The secondary free list which contains regions that have been | |
| 245 // freed up during the cleanup process. This will be appended to the | |
| 246 // master free list when appropriate. | |
| 247 SecondaryFreeRegionList _secondary_free_list; | |
| 248 | |
| 4072 | 249 // It keeps track of the old regions. |
| 250 MasterOldRegionSet _old_set; | |
| 251 | |
| 2152 | 252 // It keeps track of the humongous regions. |
| 253 MasterHumongousRegionSet _humongous_set; | |
| 342 | 254 |
| 255 // The number of regions we could create by expansion. | |
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256 uint _expansion_regions; |
| 342 | 257 |
| 258 // The block offset table for the G1 heap. | |
| 259 G1BlockOffsetSharedArray* _bot_shared; | |
| 260 | |
| 4072 | 261 // Tears down the region sets / lists so that they are empty and the |
| 262 // regions on the heap do not belong to a region set / list. The | |
| 263 // only exception is the humongous set which we leave unaltered. If | |
| 264 // free_list_only is true, it will only tear down the master free | |
| 265 // list. It is called before a Full GC (free_list_only == false) or | |
| 266 // before heap shrinking (free_list_only == true). | |
| 267 void tear_down_region_sets(bool free_list_only); | |
| 268 | |
| 269 // Rebuilds the region sets / lists so that they are repopulated to | |
| 270 // reflect the contents of the heap. The only exception is the | |
| 271 // humongous set which was not torn down in the first place. If | |
| 272 // free_list_only is true, it will only rebuild the master free | |
| 273 // list. It is called after a Full GC (free_list_only == false) or | |
| 274 // after heap shrinking (free_list_only == true). | |
| 275 void rebuild_region_sets(bool free_list_only); | |
| 342 | 276 |
| 277 // The sequence of all heap regions in the heap. | |
| 3766 | 278 HeapRegionSeq _hrs; |
| 342 | 279 |
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280 // Alloc region used to satisfy mutator allocation requests. |
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281 MutatorAllocRegion _mutator_alloc_region; |
| 342 | 282 |
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283 // Alloc region used to satisfy allocation requests by the GC for |
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284 // survivor objects. |
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285 SurvivorGCAllocRegion _survivor_gc_alloc_region; |
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286 |
| 6595 | 287 // PLAB sizing policy for survivors. |
| 288 PLABStats _survivor_plab_stats; | |
| 289 | |
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290 // Alloc region used to satisfy allocation requests by the GC for |
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291 // old objects. |
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292 OldGCAllocRegion _old_gc_alloc_region; |
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293 |
| 6595 | 294 // PLAB sizing policy for tenured objects. |
| 295 PLABStats _old_plab_stats; | |
| 296 | |
| 297 PLABStats* stats_for_purpose(GCAllocPurpose purpose) { | |
| 298 PLABStats* stats = NULL; | |
| 299 | |
| 300 switch (purpose) { | |
| 301 case GCAllocForSurvived: | |
| 302 stats = &_survivor_plab_stats; | |
| 303 break; | |
| 304 case GCAllocForTenured: | |
| 305 stats = &_old_plab_stats; | |
| 306 break; | |
| 307 default: | |
| 308 assert(false, "unrecognized GCAllocPurpose"); | |
| 309 } | |
| 310 | |
| 311 return stats; | |
| 312 } | |
| 313 | |
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314 // The last old region we allocated to during the last GC. |
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315 // Typically, it is not full so we should re-use it during the next GC. |
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316 HeapRegion* _retained_old_gc_alloc_region; |
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317 |
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318 // It specifies whether we should attempt to expand the heap after a |
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319 // region allocation failure. If heap expansion fails we set this to |
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320 // false so that we don't re-attempt the heap expansion (it's likely |
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321 // that subsequent expansion attempts will also fail if one fails). |
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322 // Currently, it is only consulted during GC and it's reset at the |
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323 // start of each GC. |
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324 bool _expand_heap_after_alloc_failure; |
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325 |
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326 // It resets the mutator alloc region before new allocations can take place. |
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327 void init_mutator_alloc_region(); |
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328 |
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329 // It releases the mutator alloc region. |
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330 void release_mutator_alloc_region(); |
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331 |
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332 // It initializes the GC alloc regions at the start of a GC. |
| 10405 | 333 void init_gc_alloc_regions(EvacuationInfo& evacuation_info); |
| 342 | 334 |
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335 // It releases the GC alloc regions at the end of a GC. |
| 10405 | 336 void release_gc_alloc_regions(uint no_of_gc_workers, EvacuationInfo& evacuation_info); |
| 342 | 337 |
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338 // It does any cleanup that needs to be done on the GC alloc regions |
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339 // before a Full GC. |
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340 void abandon_gc_alloc_regions(); |
| 342 | 341 |
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342 // Helper for monitoring and management support. |
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343 G1MonitoringSupport* _g1mm; |
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344 |
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345 // Determines PLAB size for a particular allocation purpose. |
| 6595 | 346 size_t desired_plab_sz(GCAllocPurpose purpose); |
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347 |
| 342 | 348 // Outside of GC pauses, the number of bytes used in all regions other |
| 349 // than the current allocation region. | |
| 350 size_t _summary_bytes_used; | |
| 351 | |
| 526 | 352 // This is used for a quick test on whether a reference points into |
| 353 // the collection set or not. Basically, we have an array, with one | |
| 354 // byte per region, and that byte denotes whether the corresponding | |
| 355 // region is in the collection set or not. The entry corresponding | |
| 356 // the bottom of the heap, i.e., region 0, is pointed to by | |
| 357 // _in_cset_fast_test_base. The _in_cset_fast_test field has been | |
| 358 // biased so that it actually points to address 0 of the address | |
| 359 // space, to make the test as fast as possible (we can simply shift | |
| 360 // the address to address into it, instead of having to subtract the | |
| 361 // bottom of the heap from the address before shifting it; basically | |
| 362 // it works in the same way the card table works). | |
| 363 bool* _in_cset_fast_test; | |
| 364 | |
| 365 // The allocated array used for the fast test on whether a reference | |
| 366 // points into the collection set or not. This field is also used to | |
| 367 // free the array. | |
| 368 bool* _in_cset_fast_test_base; | |
| 369 | |
| 370 // The length of the _in_cset_fast_test_base array. | |
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371 uint _in_cset_fast_test_length; |
| 526 | 372 |
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373 volatile unsigned _gc_time_stamp; |
| 342 | 374 |
| 375 size_t* _surviving_young_words; | |
| 376 | |
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377 G1HRPrinter _hr_printer; |
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378 |
| 342 | 379 void setup_surviving_young_words(); |
| 380 void update_surviving_young_words(size_t* surv_young_words); | |
| 381 void cleanup_surviving_young_words(); | |
| 382 | |
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383 // It decides whether an explicit GC should start a concurrent cycle |
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384 // instead of doing a STW GC. Currently, a concurrent cycle is |
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385 // explicitly started if: |
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386 // (a) cause == _gc_locker and +GCLockerInvokesConcurrent, or |
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387 // (b) cause == _java_lang_system_gc and +ExplicitGCInvokesConcurrent. |
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388 // (c) cause == _g1_humongous_allocation |
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389 bool should_do_concurrent_full_gc(GCCause::Cause cause); |
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390 |
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391 // Keeps track of how many "old marking cycles" (i.e., Full GCs or |
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392 // concurrent cycles) we have started. |
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393 volatile unsigned int _old_marking_cycles_started; |
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394 |
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395 // Keeps track of how many "old marking cycles" (i.e., Full GCs or |
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396 // concurrent cycles) we have completed. |
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397 volatile unsigned int _old_marking_cycles_completed; |
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398 |
| 10405 | 399 bool _concurrent_cycle_started; |
| 400 | |
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401 // This is a non-product method that is helpful for testing. It is |
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402 // called at the end of a GC and artificially expands the heap by |
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403 // allocating a number of dead regions. This way we can induce very |
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404 // frequent marking cycles and stress the cleanup / concurrent |
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405 // cleanup code more (as all the regions that will be allocated by |
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406 // this method will be found dead by the marking cycle). |
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407 void allocate_dummy_regions() PRODUCT_RETURN; |
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408 |
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409 // Clear RSets after a compaction. It also resets the GC time stamps. |
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410 void clear_rsets_post_compaction(); |
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411 |
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412 // If the HR printer is active, dump the state of the regions in the |
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413 // heap after a compaction. |
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414 void print_hrs_post_compaction(); |
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415 |
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416 double verify(bool guard, const char* msg); |
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417 void verify_before_gc(); |
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418 void verify_after_gc(); |
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419 |
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420 void log_gc_header(); |
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421 void log_gc_footer(double pause_time_sec); |
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422 |
| 1973 | 423 // These are macros so that, if the assert fires, we get the correct |
| 424 // line number, file, etc. | |
| 425 | |
| 2361 | 426 #define heap_locking_asserts_err_msg(_extra_message_) \ |
| 2152 | 427 err_msg("%s : Heap_lock locked: %s, at safepoint: %s, is VM thread: %s", \ |
| 2361 | 428 (_extra_message_), \ |
| 2152 | 429 BOOL_TO_STR(Heap_lock->owned_by_self()), \ |
| 430 BOOL_TO_STR(SafepointSynchronize::is_at_safepoint()), \ | |
| 431 BOOL_TO_STR(Thread::current()->is_VM_thread())) | |
| 1973 | 432 |
| 433 #define assert_heap_locked() \ | |
| 434 do { \ | |
| 435 assert(Heap_lock->owned_by_self(), \ | |
| 436 heap_locking_asserts_err_msg("should be holding the Heap_lock")); \ | |
| 437 } while (0) | |
| 438 | |
| 2361 | 439 #define assert_heap_locked_or_at_safepoint(_should_be_vm_thread_) \ |
| 1973 | 440 do { \ |
| 441 assert(Heap_lock->owned_by_self() || \ | |
| 2152 | 442 (SafepointSynchronize::is_at_safepoint() && \ |
| 2361 | 443 ((_should_be_vm_thread_) == Thread::current()->is_VM_thread())), \ |
| 1973 | 444 heap_locking_asserts_err_msg("should be holding the Heap_lock or " \ |
| 445 "should be at a safepoint")); \ | |
| 446 } while (0) | |
| 447 | |
| 448 #define assert_heap_locked_and_not_at_safepoint() \ | |
| 449 do { \ | |
| 450 assert(Heap_lock->owned_by_self() && \ | |
| 451 !SafepointSynchronize::is_at_safepoint(), \ | |
| 452 heap_locking_asserts_err_msg("should be holding the Heap_lock and " \ | |
| 453 "should not be at a safepoint")); \ | |
| 454 } while (0) | |
| 455 | |
| 456 #define assert_heap_not_locked() \ | |
| 457 do { \ | |
| 458 assert(!Heap_lock->owned_by_self(), \ | |
| 459 heap_locking_asserts_err_msg("should not be holding the Heap_lock")); \ | |
| 460 } while (0) | |
| 461 | |
| 462 #define assert_heap_not_locked_and_not_at_safepoint() \ | |
| 463 do { \ | |
| 464 assert(!Heap_lock->owned_by_self() && \ | |
| 465 !SafepointSynchronize::is_at_safepoint(), \ | |
| 466 heap_locking_asserts_err_msg("should not be holding the Heap_lock and " \ | |
| 467 "should not be at a safepoint")); \ | |
| 468 } while (0) | |
| 469 | |
| 2361 | 470 #define assert_at_safepoint(_should_be_vm_thread_) \ |
| 1973 | 471 do { \ |
| 2152 | 472 assert(SafepointSynchronize::is_at_safepoint() && \ |
| 2361 | 473 ((_should_be_vm_thread_) == Thread::current()->is_VM_thread()), \ |
| 1973 | 474 heap_locking_asserts_err_msg("should be at a safepoint")); \ |
| 475 } while (0) | |
| 476 | |
| 477 #define assert_not_at_safepoint() \ | |
| 478 do { \ | |
| 479 assert(!SafepointSynchronize::is_at_safepoint(), \ | |
| 480 heap_locking_asserts_err_msg("should not be at a safepoint")); \ | |
| 481 } while (0) | |
| 482 | |
| 342 | 483 protected: |
| 484 | |
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485 // The young region list. |
| 342 | 486 YoungList* _young_list; |
| 487 | |
| 488 // The current policy object for the collector. | |
| 489 G1CollectorPolicy* _g1_policy; | |
| 490 | |
| 2152 | 491 // This is the second level of trying to allocate a new region. If |
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492 // new_region() didn't find a region on the free_list, this call will |
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493 // check whether there's anything available on the |
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494 // secondary_free_list and/or wait for more regions to appear on |
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495 // that list, if _free_regions_coming is set. |
| 2361 | 496 HeapRegion* new_region_try_secondary_free_list(); |
| 342 | 497 |
| 2361 | 498 // Try to allocate a single non-humongous HeapRegion sufficient for |
| 499 // an allocation of the given word_size. If do_expand is true, | |
| 500 // attempt to expand the heap if necessary to satisfy the allocation | |
| 501 // request. | |
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502 HeapRegion* new_region(size_t word_size, bool do_expand); |
| 342 | 503 |
| 2361 | 504 // Attempt to satisfy a humongous allocation request of the given |
| 505 // size by finding a contiguous set of free regions of num_regions | |
| 506 // length and remove them from the master free list. Return the | |
| 3766 | 507 // index of the first region or G1_NULL_HRS_INDEX if the search |
| 508 // was unsuccessful. | |
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509 uint humongous_obj_allocate_find_first(uint num_regions, |
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510 size_t word_size); |
| 342 | 511 |
| 2361 | 512 // Initialize a contiguous set of free regions of length num_regions |
| 513 // and starting at index first so that they appear as a single | |
| 514 // humongous region. | |
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515 HeapWord* humongous_obj_allocate_initialize_regions(uint first, |
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516 uint num_regions, |
| 2361 | 517 size_t word_size); |
| 518 | |
| 519 // Attempt to allocate a humongous object of the given size. Return | |
| 520 // NULL if unsuccessful. | |
| 2152 | 521 HeapWord* humongous_obj_allocate(size_t word_size); |
| 1973 | 522 |
| 523 // The following two methods, allocate_new_tlab() and | |
| 524 // mem_allocate(), are the two main entry points from the runtime | |
| 525 // into the G1's allocation routines. They have the following | |
| 526 // assumptions: | |
| 527 // | |
| 528 // * They should both be called outside safepoints. | |
| 529 // | |
| 530 // * They should both be called without holding the Heap_lock. | |
| 531 // | |
| 532 // * All allocation requests for new TLABs should go to | |
| 533 // allocate_new_tlab(). | |
| 534 // | |
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535 // * All non-TLAB allocation requests should go to mem_allocate(). |
| 1973 | 536 // |
| 537 // * If either call cannot satisfy the allocation request using the | |
| 538 // current allocating region, they will try to get a new one. If | |
| 539 // this fails, they will attempt to do an evacuation pause and | |
| 540 // retry the allocation. | |
| 541 // | |
| 542 // * If all allocation attempts fail, even after trying to schedule | |
| 543 // an evacuation pause, allocate_new_tlab() will return NULL, | |
| 544 // whereas mem_allocate() will attempt a heap expansion and/or | |
| 545 // schedule a Full GC. | |
| 546 // | |
| 547 // * We do not allow humongous-sized TLABs. So, allocate_new_tlab | |
| 548 // should never be called with word_size being humongous. All | |
| 549 // humongous allocation requests should go to mem_allocate() which | |
| 550 // will satisfy them with a special path. | |
| 551 | |
| 552 virtual HeapWord* allocate_new_tlab(size_t word_size); | |
| 553 | |
| 554 virtual HeapWord* mem_allocate(size_t word_size, | |
| 555 bool* gc_overhead_limit_was_exceeded); | |
| 342 | 556 |
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557 // The following three methods take a gc_count_before_ret |
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558 // parameter which is used to return the GC count if the method |
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559 // returns NULL. Given that we are required to read the GC count |
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560 // while holding the Heap_lock, and these paths will take the |
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561 // Heap_lock at some point, it's easier to get them to read the GC |
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562 // count while holding the Heap_lock before they return NULL instead |
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563 // of the caller (namely: mem_allocate()) having to also take the |
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564 // Heap_lock just to read the GC count. |
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565 |
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566 // First-level mutator allocation attempt: try to allocate out of |
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567 // the mutator alloc region without taking the Heap_lock. This |
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568 // should only be used for non-humongous allocations. |
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569 inline HeapWord* attempt_allocation(size_t word_size, |
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570 unsigned int* gc_count_before_ret, |
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571 int* gclocker_retry_count_ret); |
| 342 | 572 |
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573 // Second-level mutator allocation attempt: take the Heap_lock and |
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574 // retry the allocation attempt, potentially scheduling a GC |
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575 // pause. This should only be used for non-humongous allocations. |
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576 HeapWord* attempt_allocation_slow(size_t word_size, |
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577 unsigned int* gc_count_before_ret, |
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578 int* gclocker_retry_count_ret); |
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579 |
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580 // Takes the Heap_lock and attempts a humongous allocation. It can |
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581 // potentially schedule a GC pause. |
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582 HeapWord* attempt_allocation_humongous(size_t word_size, |
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583 unsigned int* gc_count_before_ret, |
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584 int* gclocker_retry_count_ret); |
| 1973 | 585 |
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586 // Allocation attempt that should be called during safepoints (e.g., |
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587 // at the end of a successful GC). expect_null_mutator_alloc_region |
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588 // specifies whether the mutator alloc region is expected to be NULL |
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589 // or not. |
| 1973 | 590 HeapWord* attempt_allocation_at_safepoint(size_t word_size, |
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591 bool expect_null_mutator_alloc_region); |
| 1973 | 592 |
| 593 // It dirties the cards that cover the block so that so that the post | |
| 594 // write barrier never queues anything when updating objects on this | |
| 595 // block. It is assumed (and in fact we assert) that the block | |
| 596 // belongs to a young region. | |
| 597 inline void dirty_young_block(HeapWord* start, size_t word_size); | |
| 342 | 598 |
| 599 // Allocate blocks during garbage collection. Will ensure an | |
| 600 // allocation region, either by picking one or expanding the | |
| 601 // heap, and then allocate a block of the given size. The block | |
| 602 // may not be a humongous - it must fit into a single heap region. | |
| 603 HeapWord* par_allocate_during_gc(GCAllocPurpose purpose, size_t word_size); | |
| 604 | |
| 605 // Ensure that no further allocations can happen in "r", bearing in mind | |
| 606 // that parallel threads might be attempting allocations. | |
| 607 void par_allocate_remaining_space(HeapRegion* r); | |
| 608 | |
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609 // Allocation attempt during GC for a survivor object / PLAB. |
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610 inline HeapWord* survivor_attempt_allocation(size_t word_size); |
| 545 | 611 |
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612 // Allocation attempt during GC for an old object / PLAB. |
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613 inline HeapWord* old_attempt_allocation(size_t word_size); |
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614 |
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615 // These methods are the "callbacks" from the G1AllocRegion class. |
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616 |
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617 // For mutator alloc regions. |
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618 HeapRegion* new_mutator_alloc_region(size_t word_size, bool force); |
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619 void retire_mutator_alloc_region(HeapRegion* alloc_region, |
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620 size_t allocated_bytes); |
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621 |
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622 // For GC alloc regions. |
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623 HeapRegion* new_gc_alloc_region(size_t word_size, uint count, |
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624 GCAllocPurpose ap); |
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625 void retire_gc_alloc_region(HeapRegion* alloc_region, |
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626 size_t allocated_bytes, GCAllocPurpose ap); |
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627 |
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628 // - if explicit_gc is true, the GC is for a System.gc() or a heap |
| 1973 | 629 // inspection request and should collect the entire heap |
| 630 // - if clear_all_soft_refs is true, all soft references should be | |
| 631 // cleared during the GC | |
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632 // - if explicit_gc is false, word_size describes the allocation that |
| 1973 | 633 // the GC should attempt (at least) to satisfy |
| 634 // - it returns false if it is unable to do the collection due to the | |
| 635 // GC locker being active, true otherwise | |
| 636 bool do_collection(bool explicit_gc, | |
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637 bool clear_all_soft_refs, |
| 342 | 638 size_t word_size); |
| 639 | |
| 640 // Callback from VM_G1CollectFull operation. | |
| 641 // Perform a full collection. | |
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642 virtual void do_full_collection(bool clear_all_soft_refs); |
| 342 | 643 |
| 644 // Resize the heap if necessary after a full collection. If this is | |
| 645 // after a collect-for allocation, "word_size" is the allocation size, | |
| 646 // and will be considered part of the used portion of the heap. | |
| 647 void resize_if_necessary_after_full_collection(size_t word_size); | |
| 648 | |
| 649 // Callback from VM_G1CollectForAllocation operation. | |
| 650 // This function does everything necessary/possible to satisfy a | |
| 651 // failed allocation request (including collection, expansion, etc.) | |
| 1973 | 652 HeapWord* satisfy_failed_allocation(size_t word_size, bool* succeeded); |
| 342 | 653 |
| 654 // Attempting to expand the heap sufficiently | |
| 655 // to support an allocation of the given "word_size". If | |
| 656 // successful, perform the allocation and return the address of the | |
| 657 // allocated block, or else "NULL". | |
| 1973 | 658 HeapWord* expand_and_allocate(size_t word_size); |
| 342 | 659 |
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660 // Process any reference objects discovered during |
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661 // an incremental evacuation pause. |
| 6819 | 662 void process_discovered_references(uint no_of_gc_workers); |
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663 |
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664 // Enqueue any remaining discovered references |
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665 // after processing. |
| 6819 | 666 void enqueue_discovered_references(uint no_of_gc_workers); |
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667 |
| 342 | 668 public: |
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669 |
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670 G1MonitoringSupport* g1mm() { |
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671 assert(_g1mm != NULL, "should have been initialized"); |
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672 return _g1mm; |
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673 } |
|
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674 |
| 342 | 675 // Expand the garbage-first heap by at least the given size (in bytes!). |
|
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676 // Returns true if the heap was expanded by the requested amount; |
|
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677 // false otherwise. |
| 342 | 678 // (Rounds up to a HeapRegion boundary.) |
|
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679 bool expand(size_t expand_bytes); |
| 342 | 680 |
| 681 // Do anything common to GC's. | |
| 682 virtual void gc_prologue(bool full); | |
| 683 virtual void gc_epilogue(bool full); | |
| 684 | |
| 526 | 685 // We register a region with the fast "in collection set" test. We |
| 686 // simply set to true the array slot corresponding to this region. | |
| 687 void register_region_with_in_cset_fast_test(HeapRegion* r) { | |
| 688 assert(_in_cset_fast_test_base != NULL, "sanity"); | |
| 689 assert(r->in_collection_set(), "invariant"); | |
|
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690 uint index = r->hrs_index(); |
| 3766 | 691 assert(index < _in_cset_fast_test_length, "invariant"); |
| 526 | 692 assert(!_in_cset_fast_test_base[index], "invariant"); |
| 693 _in_cset_fast_test_base[index] = true; | |
| 694 } | |
| 695 | |
| 696 // This is a fast test on whether a reference points into the | |
| 697 // collection set or not. It does not assume that the reference | |
| 698 // points into the heap; if it doesn't, it will return false. | |
| 699 bool in_cset_fast_test(oop obj) { | |
| 700 assert(_in_cset_fast_test != NULL, "sanity"); | |
| 701 if (_g1_committed.contains((HeapWord*) obj)) { | |
| 702 // no need to subtract the bottom of the heap from obj, | |
| 703 // _in_cset_fast_test is biased | |
|
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704 uintx index = (uintx) obj >> HeapRegion::LogOfHRGrainBytes; |
| 526 | 705 bool ret = _in_cset_fast_test[index]; |
| 706 // let's make sure the result is consistent with what the slower | |
| 707 // test returns | |
| 708 assert( ret || !obj_in_cs(obj), "sanity"); | |
| 709 assert(!ret || obj_in_cs(obj), "sanity"); | |
| 710 return ret; | |
| 711 } else { | |
| 712 return false; | |
| 713 } | |
| 714 } | |
| 715 | |
|
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716 void clear_cset_fast_test() { |
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717 assert(_in_cset_fast_test_base != NULL, "sanity"); |
|
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718 memset(_in_cset_fast_test_base, false, |
|
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719 (size_t) _in_cset_fast_test_length * sizeof(bool)); |
|
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720 } |
|
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721 |
|
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|
722 // This is called at the start of either a concurrent cycle or a Full |
|
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723 // GC to update the number of old marking cycles started. |
|
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724 void increment_old_marking_cycles_started(); |
|
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725 |
|
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726 // This is called at the end of either a concurrent cycle or a Full |
|
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727 // GC to update the number of old marking cycles completed. Those two |
|
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728 // can happen in a nested fashion, i.e., we start a concurrent |
|
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729 // cycle, a Full GC happens half-way through it which ends first, |
|
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|
730 // and then the cycle notices that a Full GC happened and ends |
|
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731 // too. The concurrent parameter is a boolean to help us do a bit |
|
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|
732 // tighter consistency checking in the method. If concurrent is |
|
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733 // false, the caller is the inner caller in the nesting (i.e., the |
|
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734 // Full GC). If concurrent is true, the caller is the outer caller |
|
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|
735 // in this nesting (i.e., the concurrent cycle). Further nesting is |
|
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736 // not currently supported. The end of this call also notifies |
|
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|
737 // the FullGCCount_lock in case a Java thread is waiting for a full |
|
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|
738 // GC to happen (e.g., it called System.gc() with |
|
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739 // +ExplicitGCInvokesConcurrent). |
|
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|
740 void increment_old_marking_cycles_completed(bool concurrent); |
|
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|
741 |
|
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|
742 unsigned int old_marking_cycles_completed() { |
|
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743 return _old_marking_cycles_completed; |
|
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744 } |
|
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|
745 |
| 10405 | 746 void register_concurrent_cycle_start(jlong start_time); |
| 747 void register_concurrent_cycle_end(); | |
| 748 void trace_heap_after_concurrent_cycle(); | |
| 749 | |
| 750 G1YCType yc_type(); | |
| 751 | |
|
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752 G1HRPrinter* hr_printer() { return &_hr_printer; } |
|
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|
753 |
| 342 | 754 protected: |
| 755 | |
| 756 // Shrink the garbage-first heap by at most the given size (in bytes!). | |
| 757 // (Rounds down to a HeapRegion boundary.) | |
| 758 virtual void shrink(size_t expand_bytes); | |
| 759 void shrink_helper(size_t expand_bytes); | |
| 760 | |
| 1709 | 761 #if TASKQUEUE_STATS |
| 762 static void print_taskqueue_stats_hdr(outputStream* const st = gclog_or_tty); | |
| 763 void print_taskqueue_stats(outputStream* const st = gclog_or_tty) const; | |
| 764 void reset_taskqueue_stats(); | |
| 765 #endif // TASKQUEUE_STATS | |
| 766 | |
| 1973 | 767 // Schedule the VM operation that will do an evacuation pause to |
| 768 // satisfy an allocation request of word_size. *succeeded will | |
| 769 // return whether the VM operation was successful (it did do an | |
| 770 // evacuation pause) or not (another thread beat us to it or the GC | |
| 771 // locker was active). Given that we should not be holding the | |
| 772 // Heap_lock when we enter this method, we will pass the | |
| 773 // gc_count_before (i.e., total_collections()) as a parameter since | |
| 774 // it has to be read while holding the Heap_lock. Currently, both | |
| 775 // methods that call do_collection_pause() release the Heap_lock | |
| 776 // before the call, so it's easy to read gc_count_before just before. | |
| 777 HeapWord* do_collection_pause(size_t word_size, | |
| 778 unsigned int gc_count_before, | |
| 779 bool* succeeded); | |
| 342 | 780 |
| 781 // The guts of the incremental collection pause, executed by the vm | |
| 1973 | 782 // thread. It returns false if it is unable to do the collection due |
| 783 // to the GC locker being active, true otherwise | |
| 784 bool do_collection_pause_at_safepoint(double target_pause_time_ms); | |
| 342 | 785 |
| 786 // Actually do the work of evacuating the collection set. | |
| 10405 | 787 void evacuate_collection_set(EvacuationInfo& evacuation_info); |
| 342 | 788 |
| 789 // The g1 remembered set of the heap. | |
| 790 G1RemSet* _g1_rem_set; | |
| 791 // And it's mod ref barrier set, used to track updates for the above. | |
| 792 ModRefBarrierSet* _mr_bs; | |
| 793 | |
|
616
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|
794 // A set of cards that cover the objects for which the Rsets should be updated |
|
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|
795 // concurrently after the collection. |
|
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796 DirtyCardQueueSet _dirty_card_queue_set; |
|
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|
797 |
| 342 | 798 // The closure used to refine a single card. |
| 799 RefineCardTableEntryClosure* _refine_cte_cl; | |
| 800 | |
| 801 // A function to check the consistency of dirty card logs. | |
| 802 void check_ct_logs_at_safepoint(); | |
| 803 | |
| 1705 | 804 // A DirtyCardQueueSet that is used to hold cards that contain |
| 805 // references into the current collection set. This is used to | |
| 806 // update the remembered sets of the regions in the collection | |
| 807 // set in the event of an evacuation failure. | |
| 808 DirtyCardQueueSet _into_cset_dirty_card_queue_set; | |
| 809 | |
| 342 | 810 // After a collection pause, make the regions in the CS into free |
| 811 // regions. | |
| 10405 | 812 void free_collection_set(HeapRegion* cs_head, EvacuationInfo& evacuation_info); |
| 342 | 813 |
|
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|
814 // Abandon the current collection set without recording policy |
|
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|
815 // statistics or updating free lists. |
|
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|
816 void abandon_collection_set(HeapRegion* cs_head); |
|
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|
817 |
| 342 | 818 // Applies "scan_non_heap_roots" to roots outside the heap, |
| 819 // "scan_rs" to roots inside the heap (having done "set_region" to | |
|
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820 // indicate the region in which the root resides), |
|
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821 // and does "scan_metadata" If "scan_rs" is |
| 342 | 822 // NULL, then this step is skipped. The "worker_i" |
| 823 // param is for use with parallel roots processing, and should be | |
| 824 // the "i" of the calling parallel worker thread's work(i) function. | |
| 825 // In the sequential case this param will be ignored. | |
|
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826 void g1_process_strong_roots(bool is_scavenging, |
|
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|
827 ScanningOption so, |
| 342 | 828 OopClosure* scan_non_heap_roots, |
| 829 OopsInHeapRegionClosure* scan_rs, | |
|
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830 G1KlassScanClosure* scan_klasses, |
| 342 | 831 int worker_i); |
| 832 | |
| 833 // Apply "blk" to all the weak roots of the system. These include | |
| 834 // JNI weak roots, the code cache, system dictionary, symbol table, | |
| 835 // string table, and referents of reachable weak refs. | |
|
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|
836 void g1_process_weak_roots(OopClosure* root_closure); |
| 342 | 837 |
| 2361 | 838 // Frees a non-humongous region by initializing its contents and |
| 2152 | 839 // adding it to the free list that's passed as a parameter (this is |
| 840 // usually a local list which will be appended to the master free | |
| 841 // list later). The used bytes of freed regions are accumulated in | |
| 842 // pre_used. If par is true, the region's RSet will not be freed | |
| 843 // up. The assumption is that this will be done later. | |
| 844 void free_region(HeapRegion* hr, | |
| 845 size_t* pre_used, | |
| 846 FreeRegionList* free_list, | |
| 847 bool par); | |
| 342 | 848 |
| 2361 | 849 // Frees a humongous region by collapsing it into individual regions |
| 850 // and calling free_region() for each of them. The freed regions | |
| 851 // will be added to the free list that's passed as a parameter (this | |
| 852 // is usually a local list which will be appended to the master free | |
| 853 // list later). The used bytes of freed regions are accumulated in | |
| 854 // pre_used. If par is true, the region's RSet will not be freed | |
| 855 // up. The assumption is that this will be done later. | |
| 2152 | 856 void free_humongous_region(HeapRegion* hr, |
| 857 size_t* pre_used, | |
| 858 FreeRegionList* free_list, | |
| 859 HumongousRegionSet* humongous_proxy_set, | |
| 860 bool par); | |
| 342 | 861 |
| 3766 | 862 // Notifies all the necessary spaces that the committed space has |
| 863 // been updated (either expanded or shrunk). It should be called | |
| 864 // after _g1_storage is updated. | |
| 865 void update_committed_space(HeapWord* old_end, HeapWord* new_end); | |
| 866 | |
| 342 | 867 // The concurrent marker (and the thread it runs in.) |
| 868 ConcurrentMark* _cm; | |
| 869 ConcurrentMarkThread* _cmThread; | |
| 870 bool _mark_in_progress; | |
| 871 | |
| 872 // The concurrent refiner. | |
| 873 ConcurrentG1Refine* _cg1r; | |
| 874 | |
| 875 // The parallel task queues | |
| 876 RefToScanQueueSet *_task_queues; | |
| 877 | |
| 878 // True iff a evacuation has failed in the current collection. | |
| 879 bool _evacuation_failed; | |
| 880 | |
| 10405 | 881 EvacuationFailedInfo* _evacuation_failed_info_array; |
| 342 | 882 |
| 883 // Failed evacuations cause some logical from-space objects to have | |
| 884 // forwarding pointers to themselves. Reset them. | |
| 885 void remove_self_forwarding_pointers(); | |
| 886 | |
|
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887 // Together, these store an object with a preserved mark, and its mark value. |
|
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888 Stack<oop, mtGC> _objs_with_preserved_marks; |
|
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|
889 Stack<markOop, mtGC> _preserved_marks_of_objs; |
| 342 | 890 |
| 891 // Preserve the mark of "obj", if necessary, in preparation for its mark | |
| 892 // word being overwritten with a self-forwarding-pointer. | |
| 893 void preserve_mark_if_necessary(oop obj, markOop m); | |
| 894 | |
| 895 // The stack of evac-failure objects left to be scanned. | |
| 896 GrowableArray<oop>* _evac_failure_scan_stack; | |
| 897 // The closure to apply to evac-failure objects. | |
| 898 | |
| 899 OopsInHeapRegionClosure* _evac_failure_closure; | |
| 900 // Set the field above. | |
| 901 void | |
| 902 set_evac_failure_closure(OopsInHeapRegionClosure* evac_failure_closure) { | |
| 903 _evac_failure_closure = evac_failure_closure; | |
| 904 } | |
| 905 | |
| 906 // Push "obj" on the scan stack. | |
| 907 void push_on_evac_failure_scan_stack(oop obj); | |
| 908 // Process scan stack entries until the stack is empty. | |
| 909 void drain_evac_failure_scan_stack(); | |
| 910 // True iff an invocation of "drain_scan_stack" is in progress; to | |
| 911 // prevent unnecessary recursion. | |
| 912 bool _drain_in_progress; | |
| 913 | |
| 914 // Do any necessary initialization for evacuation-failure handling. | |
| 915 // "cl" is the closure that will be used to process evac-failure | |
| 916 // objects. | |
| 917 void init_for_evac_failure(OopsInHeapRegionClosure* cl); | |
| 918 // Do any necessary cleanup for evacuation-failure handling data | |
| 919 // structures. | |
| 920 void finalize_for_evac_failure(); | |
| 921 | |
| 922 // An attempt to evacuate "obj" has failed; take necessary steps. | |
| 10405 | 923 oop handle_evacuation_failure_par(G1ParScanThreadState* _par_scan_state, oop obj); |
| 342 | 924 void handle_evacuation_failure_common(oop obj, markOop m); |
| 925 | |
|
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926 #ifndef PRODUCT |
|
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927 // Support for forcing evacuation failures. Analogous to |
|
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928 // PromotionFailureALot for the other collectors. |
|
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929 |
|
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930 // Records whether G1EvacuationFailureALot should be in effect |
|
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931 // for the current GC |
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932 bool _evacuation_failure_alot_for_current_gc; |
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933 |
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934 // Used to record the GC number for interval checking when |
|
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935 // determining whether G1EvaucationFailureALot is in effect |
|
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936 // for the current GC. |
|
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937 size_t _evacuation_failure_alot_gc_number; |
|
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938 |
|
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|
939 // Count of the number of evacuations between failures. |
|
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|
940 volatile size_t _evacuation_failure_alot_count; |
|
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941 |
|
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942 // Set whether G1EvacuationFailureALot should be in effect |
|
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943 // for the current GC (based upon the type of GC and which |
|
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944 // command line flags are set); |
|
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945 inline bool evacuation_failure_alot_for_gc_type(bool gcs_are_young, |
|
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946 bool during_initial_mark, |
|
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|
947 bool during_marking); |
|
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|
948 |
|
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949 inline void set_evacuation_failure_alot_for_current_gc(); |
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950 |
|
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951 // Return true if it's time to cause an evacuation failure. |
|
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|
952 inline bool evacuation_should_fail(); |
|
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953 |
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954 // Reset the G1EvacuationFailureALot counters. Should be called at |
| 10405 | 955 // the end of an evacuation pause in which an evacuation failure occurred. |
|
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956 inline void reset_evacuation_should_fail(); |
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957 #endif // !PRODUCT |
|
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958 |
|
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959 // ("Weak") Reference processing support. |
|
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960 // |
| 10405 | 961 // G1 has 2 instances of the reference processor class. One |
|
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962 // (_ref_processor_cm) handles reference object discovery |
|
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963 // and subsequent processing during concurrent marking cycles. |
|
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964 // |
|
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965 // The other (_ref_processor_stw) handles reference object |
|
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966 // discovery and processing during full GCs and incremental |
|
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967 // evacuation pauses. |
|
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968 // |
|
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969 // During an incremental pause, reference discovery will be |
|
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970 // temporarily disabled for _ref_processor_cm and will be |
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971 // enabled for _ref_processor_stw. At the end of the evacuation |
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972 // pause references discovered by _ref_processor_stw will be |
|
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973 // processed and discovery will be disabled. The previous |
|
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974 // setting for reference object discovery for _ref_processor_cm |
|
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975 // will be re-instated. |
|
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976 // |
|
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977 // At the start of marking: |
|
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978 // * Discovery by the CM ref processor is verified to be inactive |
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979 // and it's discovered lists are empty. |
|
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980 // * Discovery by the CM ref processor is then enabled. |
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981 // |
|
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982 // At the end of marking: |
|
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983 // * Any references on the CM ref processor's discovered |
|
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984 // lists are processed (possibly MT). |
|
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985 // |
|
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986 // At the start of full GC we: |
|
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987 // * Disable discovery by the CM ref processor and |
|
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988 // empty CM ref processor's discovered lists |
|
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989 // (without processing any entries). |
|
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990 // * Verify that the STW ref processor is inactive and it's |
|
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991 // discovered lists are empty. |
|
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992 // * Temporarily set STW ref processor discovery as single threaded. |
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993 // * Temporarily clear the STW ref processor's _is_alive_non_header |
|
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994 // field. |
|
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995 // * Finally enable discovery by the STW ref processor. |
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996 // |
|
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997 // The STW ref processor is used to record any discovered |
|
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998 // references during the full GC. |
|
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999 // |
|
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1000 // At the end of a full GC we: |
|
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1001 // * Enqueue any reference objects discovered by the STW ref processor |
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1002 // that have non-live referents. This has the side-effect of |
|
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1003 // making the STW ref processor inactive by disabling discovery. |
|
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1004 // * Verify that the CM ref processor is still inactive |
|
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1005 // and no references have been placed on it's discovered |
|
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1006 // lists (also checked as a precondition during initial marking). |
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|
1007 |
|
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|
1008 // The (stw) reference processor... |
|
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|
1009 ReferenceProcessor* _ref_processor_stw; |
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1010 |
| 10405 | 1011 STWGCTimer* _gc_timer_stw; |
| 1012 ConcurrentGCTimer* _gc_timer_cm; | |
| 1013 | |
| 1014 G1OldTracer* _gc_tracer_cm; | |
| 1015 G1NewTracer* _gc_tracer_stw; | |
| 1016 | |
|
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1017 // During reference object discovery, the _is_alive_non_header |
|
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1018 // closure (if non-null) is applied to the referent object to |
|
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1019 // determine whether the referent is live. If so then the |
|
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1020 // reference object does not need to be 'discovered' and can |
|
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1021 // be treated as a regular oop. This has the benefit of reducing |
|
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1022 // the number of 'discovered' reference objects that need to |
|
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1023 // be processed. |
|
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1024 // |
|
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1025 // Instance of the is_alive closure for embedding into the |
|
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1026 // STW reference processor as the _is_alive_non_header field. |
|
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1027 // Supplying a value for the _is_alive_non_header field is |
|
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1028 // optional but doing so prevents unnecessary additions to |
|
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1029 // the discovered lists during reference discovery. |
|
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1030 G1STWIsAliveClosure _is_alive_closure_stw; |
|
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1031 |
|
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1032 // The (concurrent marking) reference processor... |
|
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|
1033 ReferenceProcessor* _ref_processor_cm; |
|
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|
1034 |
|
2037
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1035 // Instance of the concurrent mark is_alive closure for embedding |
|
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1036 // into the Concurrent Marking reference processor as the |
|
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1037 // _is_alive_non_header field. Supplying a value for the |
|
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1038 // _is_alive_non_header field is optional but doing so prevents |
|
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1039 // unnecessary additions to the discovered lists during reference |
|
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1040 // discovery. |
|
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1041 G1CMIsAliveClosure _is_alive_closure_cm; |
| 342 | 1042 |
|
4709
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1043 // Cache used by G1CollectedHeap::start_cset_region_for_worker(). |
|
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|
1044 HeapRegion** _worker_cset_start_region; |
|
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1045 |
|
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1046 // Time stamp to validate the regions recorded in the cache |
|
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1047 // used by G1CollectedHeap::start_cset_region_for_worker(). |
|
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1048 // The heap region entry for a given worker is valid iff |
|
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1049 // the associated time stamp value matches the current value |
|
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1050 // of G1CollectedHeap::_gc_time_stamp. |
|
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1051 unsigned int* _worker_cset_start_region_time_stamp; |
|
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1052 |
| 342 | 1053 enum G1H_process_strong_roots_tasks { |
|
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|
1054 G1H_PS_filter_satb_buffers, |
| 342 | 1055 G1H_PS_refProcessor_oops_do, |
| 1056 // Leave this one last. | |
| 1057 G1H_PS_NumElements | |
| 1058 }; | |
| 1059 | |
| 1060 SubTasksDone* _process_strong_tasks; | |
| 1061 | |
| 2152 | 1062 volatile bool _free_regions_coming; |
| 342 | 1063 |
| 1064 public: | |
|
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1065 |
|
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1066 SubTasksDone* process_strong_tasks() { return _process_strong_tasks; } |
|
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1067 |
| 342 | 1068 void set_refine_cte_cl_concurrency(bool concurrent); |
| 1069 | |
| 1709 | 1070 RefToScanQueue *task_queue(int i) const; |
| 342 | 1071 |
|
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1072 // A set of cards where updates happened during the GC |
|
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|
1073 DirtyCardQueueSet& dirty_card_queue_set() { return _dirty_card_queue_set; } |
|
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1074 |
| 1705 | 1075 // A DirtyCardQueueSet that is used to hold cards that contain |
| 1076 // references into the current collection set. This is used to | |
| 1077 // update the remembered sets of the regions in the collection | |
| 1078 // set in the event of an evacuation failure. | |
| 1079 DirtyCardQueueSet& into_cset_dirty_card_queue_set() | |
| 1080 { return _into_cset_dirty_card_queue_set; } | |
| 1081 | |
| 342 | 1082 // Create a G1CollectedHeap with the specified policy. |
| 1083 // Must call the initialize method afterwards. | |
| 1084 // May not return if something goes wrong. | |
| 1085 G1CollectedHeap(G1CollectorPolicy* policy); | |
| 1086 | |
| 1087 // Initialize the G1CollectedHeap to have the initial and | |
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1088 // maximum sizes and remembered and barrier sets |
| 342 | 1089 // specified by the policy object. |
| 1090 jint initialize(); | |
| 1091 | |
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1092 // Initialize weak reference processing. |
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1093 virtual void ref_processing_init(); |
| 342 | 1094 |
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1095 void set_par_threads(uint t) { |
| 342 | 1096 SharedHeap::set_par_threads(t); |
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1097 // Done in SharedHeap but oddly there are |
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1098 // two _process_strong_tasks's in a G1CollectedHeap |
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1099 // so do it here too. |
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1100 _process_strong_tasks->set_n_threads(t); |
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1101 } |
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1102 |
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1103 // Set _n_par_threads according to a policy TBD. |
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1104 void set_par_threads(); |
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1105 |
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1106 void set_n_termination(int t) { |
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1107 _process_strong_tasks->set_n_threads(t); |
| 342 | 1108 } |
| 1109 | |
| 1110 virtual CollectedHeap::Name kind() const { | |
| 1111 return CollectedHeap::G1CollectedHeap; | |
| 1112 } | |
| 1113 | |
| 1114 // The current policy object for the collector. | |
| 1115 G1CollectorPolicy* g1_policy() const { return _g1_policy; } | |
| 1116 | |
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1117 virtual CollectorPolicy* collector_policy() const { return (CollectorPolicy*) g1_policy(); } |
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1118 |
| 342 | 1119 // Adaptive size policy. No such thing for g1. |
| 1120 virtual AdaptiveSizePolicy* size_policy() { return NULL; } | |
| 1121 | |
| 1122 // The rem set and barrier set. | |
| 1123 G1RemSet* g1_rem_set() const { return _g1_rem_set; } | |
| 1124 ModRefBarrierSet* mr_bs() const { return _mr_bs; } | |
| 1125 | |
| 1126 unsigned get_gc_time_stamp() { | |
| 1127 return _gc_time_stamp; | |
| 1128 } | |
| 1129 | |
| 1130 void reset_gc_time_stamp() { | |
| 1131 _gc_time_stamp = 0; | |
|
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1132 OrderAccess::fence(); |
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1133 // Clear the cached CSet starting regions and time stamps. |
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1134 // Their validity is dependent on the GC timestamp. |
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1135 clear_cset_start_regions(); |
|
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1136 } |
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1137 |
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1138 void check_gc_time_stamps() PRODUCT_RETURN; |
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1139 |
|
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1140 void increment_gc_time_stamp() { |
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1141 ++_gc_time_stamp; |
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1142 OrderAccess::fence(); |
| 342 | 1143 } |
| 1144 | |
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1145 // Reset the given region's GC timestamp. If it's starts humongous, |
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1146 // also reset the GC timestamp of its corresponding |
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1147 // continues humongous regions too. |
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1148 void reset_gc_time_stamps(HeapRegion* hr); |
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1149 |
| 1705 | 1150 void iterate_dirty_card_closure(CardTableEntryClosure* cl, |
| 1151 DirtyCardQueue* into_cset_dcq, | |
| 1152 bool concurrent, int worker_i); | |
| 342 | 1153 |
| 1154 // The shared block offset table array. | |
| 1155 G1BlockOffsetSharedArray* bot_shared() const { return _bot_shared; } | |
| 1156 | |
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1157 // Reference Processing accessors |
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1158 |
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1159 // The STW reference processor.... |
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1160 ReferenceProcessor* ref_processor_stw() const { return _ref_processor_stw; } |
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1161 |
| 10405 | 1162 // The Concurrent Marking reference processor... |
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1163 ReferenceProcessor* ref_processor_cm() const { return _ref_processor_cm; } |
| 342 | 1164 |
| 10405 | 1165 ConcurrentGCTimer* gc_timer_cm() const { return _gc_timer_cm; } |
| 1166 G1OldTracer* gc_tracer_cm() const { return _gc_tracer_cm; } | |
| 1167 | |
| 342 | 1168 virtual size_t capacity() const; |
| 1169 virtual size_t used() const; | |
|
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1170 // This should be called when we're not holding the heap lock. The |
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1171 // result might be a bit inaccurate. |
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1172 size_t used_unlocked() const; |
| 342 | 1173 size_t recalculate_used() const; |
| 1174 | |
| 1175 // These virtual functions do the actual allocation. | |
| 1176 // Some heaps may offer a contiguous region for shared non-blocking | |
| 1177 // allocation, via inlined code (by exporting the address of the top and | |
| 1178 // end fields defining the extent of the contiguous allocation region.) | |
| 1179 // But G1CollectedHeap doesn't yet support this. | |
| 1180 | |
| 1181 // Return an estimate of the maximum allocation that could be performed | |
| 1182 // without triggering any collection or expansion activity. In a | |
| 1183 // generational collector, for example, this is probably the largest | |
| 1184 // allocation that could be supported (without expansion) in the youngest | |
| 1185 // generation. It is "unsafe" because no locks are taken; the result | |
| 1186 // should be treated as an approximation, not a guarantee, for use in | |
| 1187 // heuristic resizing decisions. | |
| 1188 virtual size_t unsafe_max_alloc(); | |
| 1189 | |
| 1190 virtual bool is_maximal_no_gc() const { | |
| 1191 return _g1_storage.uncommitted_size() == 0; | |
| 1192 } | |
| 1193 | |
| 1194 // The total number of regions in the heap. | |
|
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1195 uint n_regions() { return _hrs.length(); } |
| 3766 | 1196 |
| 1197 // The max number of regions in the heap. | |
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1198 uint max_regions() { return _hrs.max_length(); } |
| 342 | 1199 |
| 1200 // The number of regions that are completely free. | |
|
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1201 uint free_regions() { return _free_list.length(); } |
| 342 | 1202 |
| 1203 // The number of regions that are not completely free. | |
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1204 uint used_regions() { return n_regions() - free_regions(); } |
| 342 | 1205 |
| 1206 // The number of regions available for "regular" expansion. | |
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1207 uint expansion_regions() { return _expansion_regions; } |
| 342 | 1208 |
| 3766 | 1209 // Factory method for HeapRegion instances. It will return NULL if |
| 1210 // the allocation fails. | |
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1211 HeapRegion* new_heap_region(uint hrs_index, HeapWord* bottom); |
| 3766 | 1212 |
|
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1213 void verify_not_dirty_region(HeapRegion* hr) PRODUCT_RETURN; |
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1214 void verify_dirty_region(HeapRegion* hr) PRODUCT_RETURN; |
|
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1215 void verify_dirty_young_list(HeapRegion* head) PRODUCT_RETURN; |
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1216 void verify_dirty_young_regions() PRODUCT_RETURN; |
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1217 |
| 2152 | 1218 // verify_region_sets() performs verification over the region |
| 1219 // lists. It will be compiled in the product code to be used when | |
| 1220 // necessary (i.e., during heap verification). | |
| 1221 void verify_region_sets(); | |
| 342 | 1222 |
| 2152 | 1223 // verify_region_sets_optional() is planted in the code for |
| 1224 // list verification in non-product builds (and it can be enabled in | |
| 10405 | 1225 // product builds by defining HEAP_REGION_SET_FORCE_VERIFY to be 1). |
| 2152 | 1226 #if HEAP_REGION_SET_FORCE_VERIFY |
| 1227 void verify_region_sets_optional() { | |
| 1228 verify_region_sets(); | |
| 1229 } | |
| 1230 #else // HEAP_REGION_SET_FORCE_VERIFY | |
| 1231 void verify_region_sets_optional() { } | |
| 1232 #endif // HEAP_REGION_SET_FORCE_VERIFY | |
| 342 | 1233 |
| 2152 | 1234 #ifdef ASSERT |
| 2361 | 1235 bool is_on_master_free_list(HeapRegion* hr) { |
| 2152 | 1236 return hr->containing_set() == &_free_list; |
| 1237 } | |
| 342 | 1238 |
| 2361 | 1239 bool is_in_humongous_set(HeapRegion* hr) { |
| 2152 | 1240 return hr->containing_set() == &_humongous_set; |
| 2361 | 1241 } |
| 2152 | 1242 #endif // ASSERT |
| 342 | 1243 |
| 2152 | 1244 // Wrapper for the region list operations that can be called from |
| 1245 // methods outside this class. | |
| 342 | 1246 |
| 2152 | 1247 void secondary_free_list_add_as_tail(FreeRegionList* list) { |
| 1248 _secondary_free_list.add_as_tail(list); | |
| 1249 } | |
| 342 | 1250 |
| 2152 | 1251 void append_secondary_free_list() { |
|
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1252 _free_list.add_as_head(&_secondary_free_list); |
| 2152 | 1253 } |
| 342 | 1254 |
| 2361 | 1255 void append_secondary_free_list_if_not_empty_with_lock() { |
| 1256 // If the secondary free list looks empty there's no reason to | |
| 1257 // take the lock and then try to append it. | |
| 2152 | 1258 if (!_secondary_free_list.is_empty()) { |
| 1259 MutexLockerEx x(SecondaryFreeList_lock, Mutex::_no_safepoint_check_flag); | |
| 1260 append_secondary_free_list(); | |
| 1261 } | |
| 1262 } | |
| 342 | 1263 |
| 4072 | 1264 void old_set_remove(HeapRegion* hr) { |
| 1265 _old_set.remove(hr); | |
| 1266 } | |
| 1267 | |
|
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1268 size_t non_young_capacity_bytes() { |
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1269 return _old_set.total_capacity_bytes() + _humongous_set.total_capacity_bytes(); |
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1270 } |
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1271 |
| 2152 | 1272 void set_free_regions_coming(); |
| 1273 void reset_free_regions_coming(); | |
| 1274 bool free_regions_coming() { return _free_regions_coming; } | |
| 1275 void wait_while_free_regions_coming(); | |
| 342 | 1276 |
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1277 // Determine whether the given region is one that we are using as an |
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1278 // old GC alloc region. |
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1279 bool is_old_gc_alloc_region(HeapRegion* hr) { |
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1280 return hr == _retained_old_gc_alloc_region; |
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1281 } |
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1282 |
| 342 | 1283 // Perform a collection of the heap; intended for use in implementing |
| 1284 // "System.gc". This probably implies as full a collection as the | |
| 1285 // "CollectedHeap" supports. | |
| 1286 virtual void collect(GCCause::Cause cause); | |
| 1287 | |
| 1288 // The same as above but assume that the caller holds the Heap_lock. | |
| 1289 void collect_locked(GCCause::Cause cause); | |
| 1290 | |
| 10405 | 1291 // True iff an evacuation has failed in the most-recent collection. |
| 342 | 1292 bool evacuation_failed() { return _evacuation_failed; } |
| 1293 | |
| 2152 | 1294 // It will free a region if it has allocated objects in it that are |
| 1295 // all dead. It calls either free_region() or | |
| 1296 // free_humongous_region() depending on the type of the region that | |
| 1297 // is passed to it. | |
| 2173 | 1298 void free_region_if_empty(HeapRegion* hr, |
| 1299 size_t* pre_used, | |
| 1300 FreeRegionList* free_list, | |
| 4072 | 1301 OldRegionSet* old_proxy_set, |
| 2173 | 1302 HumongousRegionSet* humongous_proxy_set, |
| 1303 HRRSCleanupTask* hrrs_cleanup_task, | |
| 1304 bool par); | |
| 342 | 1305 |
| 2152 | 1306 // It appends the free list to the master free list and updates the |
| 1307 // master humongous list according to the contents of the proxy | |
| 1308 // list. It also adjusts the total used bytes according to pre_used | |
| 1309 // (if par is true, it will do so by taking the ParGCRareEvent_lock). | |
| 1310 void update_sets_after_freeing_regions(size_t pre_used, | |
| 1311 FreeRegionList* free_list, | |
| 4072 | 1312 OldRegionSet* old_proxy_set, |
| 2152 | 1313 HumongousRegionSet* humongous_proxy_set, |
| 1314 bool par); | |
| 342 | 1315 |
| 4708 | 1316 // Returns "TRUE" iff "p" points into the committed areas of the heap. |
| 342 | 1317 virtual bool is_in(const void* p) const; |
| 1318 | |
| 1319 // Return "TRUE" iff the given object address is within the collection | |
| 1320 // set. | |
| 1321 inline bool obj_in_cs(oop obj); | |
| 1322 | |
| 1323 // Return "TRUE" iff the given object address is in the reserved | |
|
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1324 // region of g1. |
| 342 | 1325 bool is_in_g1_reserved(const void* p) const { |
| 1326 return _g1_reserved.contains(p); | |
| 1327 } | |
| 1328 | |
|
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1329 // Returns a MemRegion that corresponds to the space that has been |
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1330 // reserved for the heap |
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1331 MemRegion g1_reserved() { |
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1332 return _g1_reserved; |
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1333 } |
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1334 |
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|
1335 // Returns a MemRegion that corresponds to the space that has been |
| 342 | 1336 // committed in the heap |
| 1337 MemRegion g1_committed() { | |
| 1338 return _g1_committed; | |
| 1339 } | |
| 1340 | |
| 2311 | 1341 virtual bool is_in_closed_subset(const void* p) const; |
| 342 | 1342 |
| 1343 // This resets the card table to all zeros. It is used after | |
| 1344 // a collection pause which used the card table to claim cards. | |
| 1345 void cleanUpCardTable(); | |
| 1346 | |
| 1347 // Iteration functions. | |
| 1348 | |
| 1349 // Iterate over all the ref-containing fields of all objects, calling | |
| 1350 // "cl.do_oop" on each. | |
|
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1351 virtual void oop_iterate(ExtendedOopClosure* cl); |
| 342 | 1352 |
| 1353 // Same as above, restricted to a memory region. | |
|
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1354 void oop_iterate(MemRegion mr, ExtendedOopClosure* cl); |
| 342 | 1355 |
| 1356 // Iterate over all objects, calling "cl.do_object" on each. | |
|
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1357 virtual void object_iterate(ObjectClosure* cl); |
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1358 |
| 678 | 1359 virtual void safe_object_iterate(ObjectClosure* cl) { |
|
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1360 object_iterate(cl); |
| 678 | 1361 } |
| 342 | 1362 |
| 1363 // Iterate over all spaces in use in the heap, in ascending address order. | |
| 1364 virtual void space_iterate(SpaceClosure* cl); | |
| 1365 | |
| 1366 // Iterate over heap regions, in address order, terminating the | |
| 1367 // iteration early if the "doHeapRegion" method returns "true". | |
| 3766 | 1368 void heap_region_iterate(HeapRegionClosure* blk) const; |
| 342 | 1369 |
| 3766 | 1370 // Return the region with the given index. It assumes the index is valid. |
|
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1371 HeapRegion* region_at(uint index) const { return _hrs.at(index); } |
| 342 | 1372 |
| 1373 // Divide the heap region sequence into "chunks" of some size (the number | |
| 1374 // of regions divided by the number of parallel threads times some | |
| 1375 // overpartition factor, currently 4). Assumes that this will be called | |
| 1376 // in parallel by ParallelGCThreads worker threads with discinct worker | |
| 1377 // ids in the range [0..max(ParallelGCThreads-1, 1)], that all parallel | |
| 1378 // calls will use the same "claim_value", and that that claim value is | |
| 1379 // different from the claim_value of any heap region before the start of | |
| 1380 // the iteration. Applies "blk->doHeapRegion" to each of the regions, by | |
| 1381 // attempting to claim the first region in each chunk, and, if | |
| 1382 // successful, applying the closure to each region in the chunk (and | |
| 1383 // setting the claim value of the second and subsequent regions of the | |
| 1384 // chunk.) For now requires that "doHeapRegion" always returns "false", | |
| 1385 // i.e., that a closure never attempt to abort a traversal. | |
| 1386 void heap_region_par_iterate_chunked(HeapRegionClosure* blk, | |
|
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1387 uint worker, |
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1388 uint no_of_par_workers, |
| 342 | 1389 jint claim_value); |
| 1390 | |
| 390 | 1391 // It resets all the region claim values to the default. |
| 1392 void reset_heap_region_claim_values(); | |
| 1393 | |
|
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1394 // Resets the claim values of regions in the current |
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1395 // collection set to the default. |
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1396 void reset_cset_heap_region_claim_values(); |
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1397 |
| 355 | 1398 #ifdef ASSERT |
| 1399 bool check_heap_region_claim_values(jint claim_value); | |
|
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1400 |
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1401 // Same as the routine above but only checks regions in the |
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1402 // current collection set. |
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1403 bool check_cset_heap_region_claim_values(jint claim_value); |
| 355 | 1404 #endif // ASSERT |
| 1405 | |
|
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1406 // Clear the cached cset start regions and (more importantly) |
|
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1407 // the time stamps. Called when we reset the GC time stamp. |
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1408 void clear_cset_start_regions(); |
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1409 |
|
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1410 // Given the id of a worker, obtain or calculate a suitable |
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1411 // starting region for iterating over the current collection set. |
|
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1412 HeapRegion* start_cset_region_for_worker(int worker_i); |
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1413 |
|
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1414 // This is a convenience method that is used by the |
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1415 // HeapRegionIterator classes to calculate the starting region for |
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1416 // each worker so that they do not all start from the same region. |
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1417 HeapRegion* start_region_for_worker(uint worker_i, uint no_of_par_workers); |
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1418 |
| 342 | 1419 // Iterate over the regions (if any) in the current collection set. |
| 1420 void collection_set_iterate(HeapRegionClosure* blk); | |
| 1421 | |
| 1422 // As above but starting from region r | |
| 1423 void collection_set_iterate_from(HeapRegion* r, HeapRegionClosure *blk); | |
| 1424 | |
| 1425 // Returns the first (lowest address) compactible space in the heap. | |
| 1426 virtual CompactibleSpace* first_compactible_space(); | |
| 1427 | |
| 1428 // A CollectedHeap will contain some number of spaces. This finds the | |
| 1429 // space containing a given address, or else returns NULL. | |
| 1430 virtual Space* space_containing(const void* addr) const; | |
| 1431 | |
| 1432 // A G1CollectedHeap will contain some number of heap regions. This | |
| 1433 // finds the region containing a given address, or else returns NULL. | |
| 3766 | 1434 template <class T> |
| 1435 inline HeapRegion* heap_region_containing(const T addr) const; | |
| 342 | 1436 |
| 1437 // Like the above, but requires "addr" to be in the heap (to avoid a | |
| 1438 // null-check), and unlike the above, may return an continuing humongous | |
| 1439 // region. | |
| 3766 | 1440 template <class T> |
| 1441 inline HeapRegion* heap_region_containing_raw(const T addr) const; | |
| 342 | 1442 |
| 1443 // A CollectedHeap is divided into a dense sequence of "blocks"; that is, | |
| 1444 // each address in the (reserved) heap is a member of exactly | |
| 1445 // one block. The defining characteristic of a block is that it is | |
| 1446 // possible to find its size, and thus to progress forward to the next | |
| 1447 // block. (Blocks may be of different sizes.) Thus, blocks may | |
| 1448 // represent Java objects, or they might be free blocks in a | |
| 1449 // free-list-based heap (or subheap), as long as the two kinds are | |
| 1450 // distinguishable and the size of each is determinable. | |
| 1451 | |
| 1452 // Returns the address of the start of the "block" that contains the | |
| 1453 // address "addr". We say "blocks" instead of "object" since some heaps | |
| 1454 // may not pack objects densely; a chunk may either be an object or a | |
| 1455 // non-object. | |
| 1456 virtual HeapWord* block_start(const void* addr) const; | |
| 1457 | |
| 1458 // Requires "addr" to be the start of a chunk, and returns its size. | |
| 1459 // "addr + size" is required to be the start of a new chunk, or the end | |
| 1460 // of the active area of the heap. | |
| 1461 virtual size_t block_size(const HeapWord* addr) const; | |
| 1462 | |
| 1463 // Requires "addr" to be the start of a block, and returns "TRUE" iff | |
| 1464 // the block is an object. | |
| 1465 virtual bool block_is_obj(const HeapWord* addr) const; | |
| 1466 | |
| 1467 // Does this heap support heap inspection? (+PrintClassHistogram) | |
| 1468 virtual bool supports_heap_inspection() const { return true; } | |
| 1469 | |
| 1470 // Section on thread-local allocation buffers (TLABs) | |
| 1471 // See CollectedHeap for semantics. | |
| 1472 | |
| 1473 virtual bool supports_tlab_allocation() const; | |
| 1474 virtual size_t tlab_capacity(Thread* thr) const; | |
| 1475 virtual size_t unsafe_max_tlab_alloc(Thread* thr) const; | |
| 1476 | |
| 1477 // Can a compiler initialize a new object without store barriers? | |
| 1478 // This permission only extends from the creation of a new object | |
|
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1479 // via a TLAB up to the first subsequent safepoint. If such permission |
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1480 // is granted for this heap type, the compiler promises to call |
|
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1481 // defer_store_barrier() below on any slow path allocation of |
|
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1482 // a new object for which such initializing store barriers will |
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1483 // have been elided. G1, like CMS, allows this, but should be |
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1484 // ready to provide a compensating write barrier as necessary |
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1485 // if that storage came out of a non-young region. The efficiency |
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1486 // of this implementation depends crucially on being able to |
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1487 // answer very efficiently in constant time whether a piece of |
|
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1488 // storage in the heap comes from a young region or not. |
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|
1489 // See ReduceInitialCardMarks. |
| 342 | 1490 virtual bool can_elide_tlab_store_barriers() const { |
|
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1491 return true; |
|
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1492 } |
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|
1493 |
| 1166 | 1494 virtual bool card_mark_must_follow_store() const { |
| 1495 return true; | |
| 1496 } | |
| 1497 | |
| 3766 | 1498 bool is_in_young(const oop obj) { |
|
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1499 HeapRegion* hr = heap_region_containing(obj); |
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1500 return hr != NULL && hr->is_young(); |
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|
1501 } |
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|
1502 |
|
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1503 #ifdef ASSERT |
|
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1504 virtual bool is_in_partial_collection(const void* p); |
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1505 #endif |
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1506 |
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1507 virtual bool is_scavengable(const void* addr); |
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1508 |
|
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1509 // We don't need barriers for initializing stores to objects |
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1510 // in the young gen: for the SATB pre-barrier, there is no |
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1511 // pre-value that needs to be remembered; for the remembered-set |
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1512 // update logging post-barrier, we don't maintain remembered set |
|
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1513 // information for young gen objects. |
|
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1514 virtual bool can_elide_initializing_store_barrier(oop new_obj) { |
|
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|
1515 return is_in_young(new_obj); |
| 342 | 1516 } |
| 1517 | |
| 1518 // Returns "true" iff the given word_size is "very large". | |
| 1519 static bool isHumongous(size_t word_size) { | |
|
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1520 // Note this has to be strictly greater-than as the TLABs |
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1521 // are capped at the humongous thresold and we want to |
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1522 // ensure that we don't try to allocate a TLAB as |
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1523 // humongous and that we don't allocate a humongous |
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1524 // object in a TLAB. |
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1525 return word_size > _humongous_object_threshold_in_words; |
| 342 | 1526 } |
| 1527 | |
| 1528 // Update mod union table with the set of dirty cards. | |
| 1529 void updateModUnion(); | |
| 1530 | |
| 1531 // Set the mod union bits corresponding to the given memRegion. Note | |
| 1532 // that this is always a safe operation, since it doesn't clear any | |
| 1533 // bits. | |
| 1534 void markModUnionRange(MemRegion mr); | |
| 1535 | |
| 1536 // Records the fact that a marking phase is no longer in progress. | |
| 1537 void set_marking_complete() { | |
| 1538 _mark_in_progress = false; | |
| 1539 } | |
| 1540 void set_marking_started() { | |
| 1541 _mark_in_progress = true; | |
| 1542 } | |
| 1543 bool mark_in_progress() { | |
| 1544 return _mark_in_progress; | |
| 1545 } | |
| 1546 | |
| 1547 // Print the maximum heap capacity. | |
| 1548 virtual size_t max_capacity() const; | |
| 1549 | |
| 1550 virtual jlong millis_since_last_gc(); | |
| 1551 | |
| 1552 // Perform any cleanup actions necessary before allowing a verification. | |
| 1553 virtual void prepare_for_verify(); | |
| 1554 | |
| 1555 // Perform verification. | |
| 811 | 1556 |
|
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1557 // vo == UsePrevMarking -> use "prev" marking information, |
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1558 // vo == UseNextMarking -> use "next" marking information |
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1559 // vo == UseMarkWord -> use the mark word in the object header |
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1560 // |
| 811 | 1561 // NOTE: Only the "prev" marking information is guaranteed to be |
| 1562 // consistent most of the time, so most calls to this should use | |
|
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1563 // vo == UsePrevMarking. |
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1564 // Currently, there is only one case where this is called with |
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1565 // vo == UseNextMarking, which is to verify the "next" marking |
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|
1566 // information at the end of remark. |
|
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1567 // Currently there is only one place where this is called with |
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1568 // vo == UseMarkWord, which is to verify the marking during a |
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1569 // full GC. |
| 6008 | 1570 void verify(bool silent, VerifyOption vo); |
| 811 | 1571 |
| 1572 // Override; it uses the "prev" marking information | |
| 6008 | 1573 virtual void verify(bool silent); |
| 10405 | 1574 |
| 342 | 1575 virtual void print_on(outputStream* st) const; |
|
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1576 virtual void print_extended_on(outputStream* st) const; |
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1577 virtual void print_on_error(outputStream* st) const; |
| 342 | 1578 |
| 1579 virtual void print_gc_threads_on(outputStream* st) const; | |
| 1580 virtual void gc_threads_do(ThreadClosure* tc) const; | |
| 1581 | |
| 1582 // Override | |
| 1583 void print_tracing_info() const; | |
| 1584 | |
|
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1585 // The following two methods are helpful for debugging RSet issues. |
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1586 void print_cset_rsets() PRODUCT_RETURN; |
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1587 void print_all_rsets() PRODUCT_RETURN; |
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1588 |
| 342 | 1589 // Convenience function to be used in situations where the heap type can be |
| 1590 // asserted to be this type. | |
| 1591 static G1CollectedHeap* heap(); | |
| 1592 | |
| 1593 void set_region_short_lived_locked(HeapRegion* hr); | |
| 1594 // add appropriate methods for any other surv rate groups | |
| 1595 | |
|
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1596 YoungList* young_list() { return _young_list; } |
| 342 | 1597 |
| 1598 // debugging | |
| 1599 bool check_young_list_well_formed() { | |
| 1600 return _young_list->check_list_well_formed(); | |
| 1601 } | |
|
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1602 |
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1603 bool check_young_list_empty(bool check_heap, |
| 342 | 1604 bool check_sample = true); |
| 1605 | |
| 1606 // *** Stuff related to concurrent marking. It's not clear to me that so | |
| 1607 // many of these need to be public. | |
| 1608 | |
| 1609 // The functions below are helper functions that a subclass of | |
| 1610 // "CollectedHeap" can use in the implementation of its virtual | |
| 1611 // functions. | |
| 1612 // This performs a concurrent marking of the live objects in a | |
| 1613 // bitmap off to the side. | |
| 1614 void doConcurrentMark(); | |
| 1615 | |
| 1616 bool isMarkedPrev(oop obj) const; | |
| 1617 bool isMarkedNext(oop obj) const; | |
| 1618 | |
| 1619 // Determine if an object is dead, given the object and also | |
| 1620 // the region to which the object belongs. An object is dead | |
| 1621 // iff a) it was not allocated since the last mark and b) it | |
| 1622 // is not marked. | |
| 1623 | |
| 1624 bool is_obj_dead(const oop obj, const HeapRegion* hr) const { | |
| 1625 return | |
| 1626 !hr->obj_allocated_since_prev_marking(obj) && | |
| 1627 !isMarkedPrev(obj); | |
| 1628 } | |
| 1629 | |
| 1630 // This function returns true when an object has been | |
| 1631 // around since the previous marking and hasn't yet | |
| 1632 // been marked during this marking. | |
| 1633 | |
| 1634 bool is_obj_ill(const oop obj, const HeapRegion* hr) const { | |
| 1635 return | |
| 1636 !hr->obj_allocated_since_next_marking(obj) && | |
| 1637 !isMarkedNext(obj); | |
| 1638 } | |
| 1639 | |
| 1640 // Determine if an object is dead, given only the object itself. | |
| 1641 // This will find the region to which the object belongs and | |
| 1642 // then call the region version of the same function. | |
| 1643 | |
| 1644 // Added if it is NULL it isn't dead. | |
| 1645 | |
|
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1646 bool is_obj_dead(const oop obj) const { |
| 811 | 1647 const HeapRegion* hr = heap_region_containing(obj); |
| 342 | 1648 if (hr == NULL) { |
|
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1649 if (obj == NULL) return false; |
| 342 | 1650 else return true; |
| 1651 } | |
| 1652 else return is_obj_dead(obj, hr); | |
| 1653 } | |
| 1654 | |
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1655 bool is_obj_ill(const oop obj) const { |
| 811 | 1656 const HeapRegion* hr = heap_region_containing(obj); |
| 342 | 1657 if (hr == NULL) { |
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1658 if (obj == NULL) return false; |
| 342 | 1659 else return true; |
| 1660 } | |
| 1661 else return is_obj_ill(obj, hr); | |
| 1662 } | |
| 1663 | |
|
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1664 // The methods below are here for convenience and dispatch the |
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1665 // appropriate method depending on value of the given VerifyOption |
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1666 // parameter. The options for that parameter are: |
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1667 // |
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1668 // vo == UsePrevMarking -> use "prev" marking information, |
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1669 // vo == UseNextMarking -> use "next" marking information, |
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1670 // vo == UseMarkWord -> use mark word from object header |
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1671 |
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1672 bool is_obj_dead_cond(const oop obj, |
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1673 const HeapRegion* hr, |
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1674 const VerifyOption vo) const { |
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1675 switch (vo) { |
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1676 case VerifyOption_G1UsePrevMarking: return is_obj_dead(obj, hr); |
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1677 case VerifyOption_G1UseNextMarking: return is_obj_ill(obj, hr); |
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1678 case VerifyOption_G1UseMarkWord: return !obj->is_gc_marked(); |
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|
1679 default: ShouldNotReachHere(); |
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|
1680 } |
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|
1681 return false; // keep some compilers happy |
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|
1682 } |
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1683 |
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1684 bool is_obj_dead_cond(const oop obj, |
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1685 const VerifyOption vo) const { |
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1686 switch (vo) { |
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1687 case VerifyOption_G1UsePrevMarking: return is_obj_dead(obj); |
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1688 case VerifyOption_G1UseNextMarking: return is_obj_ill(obj); |
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1689 case VerifyOption_G1UseMarkWord: return !obj->is_gc_marked(); |
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1690 default: ShouldNotReachHere(); |
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|
1691 } |
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|
1692 return false; // keep some compilers happy |
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|
1693 } |
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|
1694 |
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|
1695 bool allocated_since_marking(oop obj, HeapRegion* hr, VerifyOption vo); |
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1696 HeapWord* top_at_mark_start(HeapRegion* hr, VerifyOption vo); |
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1697 bool is_marked(oop obj, VerifyOption vo); |
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1698 const char* top_at_mark_start_str(VerifyOption vo); |
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|
1699 |
| 342 | 1700 // The following is just to alert the verification code |
| 1701 // that a full collection has occurred and that the | |
| 1702 // remembered sets are no longer up to date. | |
| 1703 bool _full_collection; | |
| 1704 void set_full_collection() { _full_collection = true;} | |
| 1705 void clear_full_collection() {_full_collection = false;} | |
| 1706 bool full_collection() {return _full_collection;} | |
| 1707 | |
| 1708 ConcurrentMark* concurrent_mark() const { return _cm; } | |
| 1709 ConcurrentG1Refine* concurrent_g1_refine() const { return _cg1r; } | |
| 1710 | |
|
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|
1711 // The dirty cards region list is used to record a subset of regions |
|
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|
1712 // whose cards need clearing. The list if populated during the |
|
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1713 // remembered set scanning and drained during the card table |
|
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|
1714 // cleanup. Although the methods are reentrant, population/draining |
|
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1715 // phases must not overlap. For synchronization purposes the last |
|
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|
1716 // element on the list points to itself. |
|
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|
1717 HeapRegion* _dirty_cards_region_list; |
|
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|
1718 void push_dirty_cards_region(HeapRegion* hr); |
|
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|
1719 HeapRegion* pop_dirty_cards_region(); |
|
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|
1720 |
| 342 | 1721 public: |
| 1722 void stop_conc_gc_threads(); | |
| 1723 | |
| 1724 size_t pending_card_num(); | |
| 1725 size_t cards_scanned(); | |
| 1726 | |
| 1727 protected: | |
| 1728 size_t _max_heap_capacity; | |
| 1729 }; | |
| 1730 | |
|
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1731 class G1ParGCAllocBuffer: public ParGCAllocBuffer { |
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1732 private: |
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1733 bool _retired; |
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1734 |
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1735 public: |
|
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1736 G1ParGCAllocBuffer(size_t gclab_word_size); |
|
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1737 |
|
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1738 void set_buf(HeapWord* buf) { |
|
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1739 ParGCAllocBuffer::set_buf(buf); |
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1740 _retired = false; |
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|
1741 } |
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1742 |
|
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1743 void retire(bool end_of_gc, bool retain) { |
|
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1744 if (_retired) |
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|
1745 return; |
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1746 ParGCAllocBuffer::retire(end_of_gc, retain); |
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|
1747 _retired = true; |
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|
1748 } |
|
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1749 |
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1750 bool is_retired() { |
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1751 return _retired; |
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|
1752 } |
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|
1753 }; |
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1754 |
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|
1755 class G1ParGCAllocBufferContainer { |
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1756 protected: |
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1757 static int const _priority_max = 2; |
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1758 G1ParGCAllocBuffer* _priority_buffer[_priority_max]; |
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1759 |
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1760 public: |
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|
1761 G1ParGCAllocBufferContainer(size_t gclab_word_size) { |
|
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1762 for (int pr = 0; pr < _priority_max; ++pr) { |
|
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|
1763 _priority_buffer[pr] = new G1ParGCAllocBuffer(gclab_word_size); |
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|
1764 } |
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|
1765 } |
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|
1766 |
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1767 ~G1ParGCAllocBufferContainer() { |
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1768 for (int pr = 0; pr < _priority_max; ++pr) { |
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1769 assert(_priority_buffer[pr]->is_retired(), "alloc buffers should all retire at this point."); |
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1770 delete _priority_buffer[pr]; |
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1771 } |
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1772 } |
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1773 |
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1774 HeapWord* allocate(size_t word_sz) { |
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1775 HeapWord* obj; |
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1776 for (int pr = 0; pr < _priority_max; ++pr) { |
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1777 obj = _priority_buffer[pr]->allocate(word_sz); |
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1778 if (obj != NULL) return obj; |
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1779 } |
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1780 return obj; |
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1781 } |
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1782 |
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1783 bool contains(void* addr) { |
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1784 for (int pr = 0; pr < _priority_max; ++pr) { |
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1785 if (_priority_buffer[pr]->contains(addr)) return true; |
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1786 } |
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1787 return false; |
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1788 } |
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1789 |
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1790 void undo_allocation(HeapWord* obj, size_t word_sz) { |
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1791 bool finish_undo; |
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1792 for (int pr = 0; pr < _priority_max; ++pr) { |
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1793 if (_priority_buffer[pr]->contains(obj)) { |
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1794 _priority_buffer[pr]->undo_allocation(obj, word_sz); |
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1795 finish_undo = true; |
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1796 } |
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1797 } |
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1798 if (!finish_undo) ShouldNotReachHere(); |
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1799 } |
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1800 |
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1801 size_t words_remaining() { |
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1802 size_t result = 0; |
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1803 for (int pr = 0; pr < _priority_max; ++pr) { |
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1804 result += _priority_buffer[pr]->words_remaining(); |
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1805 } |
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1806 return result; |
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1807 } |
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1808 |
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1809 size_t words_remaining_in_retired_buffer() { |
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1810 G1ParGCAllocBuffer* retired = _priority_buffer[0]; |
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1811 return retired->words_remaining(); |
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1812 } |
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1813 |
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1814 void flush_stats_and_retire(PLABStats* stats, bool end_of_gc, bool retain) { |
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1815 for (int pr = 0; pr < _priority_max; ++pr) { |
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1816 _priority_buffer[pr]->flush_stats_and_retire(stats, end_of_gc, retain); |
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1817 } |
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1818 } |
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1819 |
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1820 void update(bool end_of_gc, bool retain, HeapWord* buf, size_t word_sz) { |
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1821 G1ParGCAllocBuffer* retired_and_set = _priority_buffer[0]; |
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1822 retired_and_set->retire(end_of_gc, retain); |
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1823 retired_and_set->set_buf(buf); |
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1824 retired_and_set->set_word_size(word_sz); |
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1825 adjust_priority_order(); |
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1826 } |
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1827 |
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1828 private: |
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1829 void adjust_priority_order() { |
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1830 G1ParGCAllocBuffer* retired_and_set = _priority_buffer[0]; |
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1831 |
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1832 int last = _priority_max - 1; |
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1833 for (int pr = 0; pr < last; ++pr) { |
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1834 _priority_buffer[pr] = _priority_buffer[pr + 1]; |
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1835 } |
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1836 _priority_buffer[last] = retired_and_set; |
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1837 } |
|
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1838 }; |
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1839 |
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1840 class G1ParScanThreadState : public StackObj { |
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1841 protected: |
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1842 G1CollectedHeap* _g1h; |
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1843 RefToScanQueue* _refs; |
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1844 DirtyCardQueue _dcq; |
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1845 CardTableModRefBS* _ct_bs; |
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1846 G1RemSet* _g1_rem; |
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1847 |
|
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1848 G1ParGCAllocBufferContainer _surviving_alloc_buffer; |
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1849 G1ParGCAllocBufferContainer _tenured_alloc_buffer; |
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1850 G1ParGCAllocBufferContainer* _alloc_buffers[GCAllocPurposeCount]; |
|
1391
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1851 ageTable _age_table; |
|
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1852 |
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1853 size_t _alloc_buffer_waste; |
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1854 size_t _undo_waste; |
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1855 |
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1856 OopsInHeapRegionClosure* _evac_failure_cl; |
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1857 G1ParScanHeapEvacClosure* _evac_cl; |
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1858 G1ParScanPartialArrayClosure* _partial_scan_cl; |
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1859 |
| 10405 | 1860 int _hash_seed; |
|
4836
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1861 uint _queue_num; |
|
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1862 |
| 1611 | 1863 size_t _term_attempts; |
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1864 |
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1865 double _start; |
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1866 double _start_strong_roots; |
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1867 double _strong_roots_time; |
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1868 double _start_term; |
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|
1869 double _term_time; |
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1870 |
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1871 // Map from young-age-index (0 == not young, 1 is youngest) to |
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1872 // surviving words. base is what we get back from the malloc call |
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1873 size_t* _surviving_young_words_base; |
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1874 // this points into the array, as we use the first few entries for padding |
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1875 size_t* _surviving_young_words; |
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1876 |
| 1709 | 1877 #define PADDING_ELEM_NUM (DEFAULT_CACHE_LINE_SIZE / sizeof(size_t)) |
|
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1878 |
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1879 void add_to_alloc_buffer_waste(size_t waste) { _alloc_buffer_waste += waste; } |
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1880 |
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1881 void add_to_undo_waste(size_t waste) { _undo_waste += waste; } |
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1882 |
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1883 DirtyCardQueue& dirty_card_queue() { return _dcq; } |
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1884 CardTableModRefBS* ctbs() { return _ct_bs; } |
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1885 |
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1886 template <class T> void immediate_rs_update(HeapRegion* from, T* p, int tid) { |
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|
1887 if (!from->is_survivor()) { |
|
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|
1888 _g1_rem->par_write_ref(from, p, tid); |
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|
1889 } |
|
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1890 } |
|
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1891 |
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1892 template <class T> void deferred_rs_update(HeapRegion* from, T* p, int tid) { |
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1893 // If the new value of the field points to the same region or |
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1894 // is the to-space, we don't need to include it in the Rset updates. |
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1895 if (!from->is_in_reserved(oopDesc::load_decode_heap_oop(p)) && !from->is_survivor()) { |
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1896 size_t card_index = ctbs()->index_for(p); |
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1897 // If the card hasn't been added to the buffer, do it. |
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1898 if (ctbs()->mark_card_deferred(card_index)) { |
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1899 dirty_card_queue().enqueue((jbyte*)ctbs()->byte_for_index(card_index)); |
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1900 } |
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1901 } |
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1902 } |
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1903 |
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1904 public: |
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1905 G1ParScanThreadState(G1CollectedHeap* g1h, uint queue_num); |
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1906 |
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1907 ~G1ParScanThreadState() { |
| 6197 | 1908 FREE_C_HEAP_ARRAY(size_t, _surviving_young_words_base, mtGC); |
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1909 } |
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1910 |
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1911 RefToScanQueue* refs() { return _refs; } |
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1912 ageTable* age_table() { return &_age_table; } |
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1913 |
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1914 G1ParGCAllocBufferContainer* alloc_buffer(GCAllocPurpose purpose) { |
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1915 return _alloc_buffers[purpose]; |
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1916 } |
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1917 |
| 1709 | 1918 size_t alloc_buffer_waste() const { return _alloc_buffer_waste; } |
| 1919 size_t undo_waste() const { return _undo_waste; } | |
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1920 |
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1921 #ifdef ASSERT |
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1922 bool verify_ref(narrowOop* ref) const; |
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1923 bool verify_ref(oop* ref) const; |
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1924 bool verify_task(StarTask ref) const; |
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1925 #endif // ASSERT |
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1926 |
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1927 template <class T> void push_on_queue(T* ref) { |
|
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1928 assert(verify_ref(ref), "sanity"); |
| 1709 | 1929 refs()->push(ref); |
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1930 } |
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1931 |
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1932 template <class T> void update_rs(HeapRegion* from, T* p, int tid) { |
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1933 if (G1DeferredRSUpdate) { |
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1934 deferred_rs_update(from, p, tid); |
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1935 } else { |
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1936 immediate_rs_update(from, p, tid); |
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1937 } |
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1938 } |
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1939 |
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1940 HeapWord* allocate_slow(GCAllocPurpose purpose, size_t word_sz) { |
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1941 HeapWord* obj = NULL; |
|
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1942 size_t gclab_word_size = _g1h->desired_plab_sz(purpose); |
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1943 if (word_sz * 100 < gclab_word_size * ParallelGCBufferWastePct) { |
|
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1944 G1ParGCAllocBufferContainer* alloc_buf = alloc_buffer(purpose); |
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1945 |
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1946 HeapWord* buf = _g1h->par_allocate_during_gc(purpose, gclab_word_size); |
|
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1947 if (buf == NULL) return NULL; // Let caller handle allocation failure. |
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1948 |
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1949 add_to_alloc_buffer_waste(alloc_buf->words_remaining_in_retired_buffer()); |
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1950 alloc_buf->update(false /* end_of_gc */, false /* retain */, buf, gclab_word_size); |
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1951 |
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1952 obj = alloc_buf->allocate(word_sz); |
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1953 assert(obj != NULL, "buffer was definitely big enough..."); |
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1954 } else { |
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1955 obj = _g1h->par_allocate_during_gc(purpose, word_sz); |
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1956 } |
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1957 return obj; |
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1958 } |
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1959 |
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1960 HeapWord* allocate(GCAllocPurpose purpose, size_t word_sz) { |
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1961 HeapWord* obj = alloc_buffer(purpose)->allocate(word_sz); |
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1962 if (obj != NULL) return obj; |
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1963 return allocate_slow(purpose, word_sz); |
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1964 } |
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1965 |
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1966 void undo_allocation(GCAllocPurpose purpose, HeapWord* obj, size_t word_sz) { |
|
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1967 if (alloc_buffer(purpose)->contains(obj)) { |
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1968 assert(alloc_buffer(purpose)->contains(obj + word_sz - 1), |
|
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1969 "should contain whole object"); |
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1970 alloc_buffer(purpose)->undo_allocation(obj, word_sz); |
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1971 } else { |
|
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1972 CollectedHeap::fill_with_object(obj, word_sz); |
|
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1973 add_to_undo_waste(word_sz); |
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1974 } |
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1975 } |
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1976 |
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1977 void set_evac_failure_closure(OopsInHeapRegionClosure* evac_failure_cl) { |
|
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1978 _evac_failure_cl = evac_failure_cl; |
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1979 } |
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1980 OopsInHeapRegionClosure* evac_failure_closure() { |
|
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1981 return _evac_failure_cl; |
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1982 } |
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1983 |
|
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1984 void set_evac_closure(G1ParScanHeapEvacClosure* evac_cl) { |
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1985 _evac_cl = evac_cl; |
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1986 } |
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1987 |
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1988 void set_partial_scan_closure(G1ParScanPartialArrayClosure* partial_scan_cl) { |
|
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1989 _partial_scan_cl = partial_scan_cl; |
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1990 } |
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1991 |
|
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1992 int* hash_seed() { return &_hash_seed; } |
|
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1993 uint queue_num() { return _queue_num; } |
|
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1994 |
| 1709 | 1995 size_t term_attempts() const { return _term_attempts; } |
| 1611 | 1996 void note_term_attempt() { _term_attempts++; } |
|
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1997 |
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1998 void start_strong_roots() { |
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1999 _start_strong_roots = os::elapsedTime(); |
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2000 } |
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2001 void end_strong_roots() { |
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2002 _strong_roots_time += (os::elapsedTime() - _start_strong_roots); |
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2003 } |
| 1709 | 2004 double strong_roots_time() const { return _strong_roots_time; } |
|
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2005 |
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2006 void start_term_time() { |
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2007 note_term_attempt(); |
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2008 _start_term = os::elapsedTime(); |
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2009 } |
|
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2010 void end_term_time() { |
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2011 _term_time += (os::elapsedTime() - _start_term); |
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2012 } |
| 1709 | 2013 double term_time() const { return _term_time; } |
|
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2014 |
| 1709 | 2015 double elapsed_time() const { |
|
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2016 return os::elapsedTime() - _start; |
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2017 } |
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2018 |
| 1709 | 2019 static void |
| 2020 print_termination_stats_hdr(outputStream* const st = gclog_or_tty); | |
| 2021 void | |
| 2022 print_termination_stats(int i, outputStream* const st = gclog_or_tty) const; | |
| 2023 | |
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2024 size_t* surviving_young_words() { |
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2025 // We add on to hide entry 0 which accumulates surviving words for |
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2026 // age -1 regions (i.e. non-young ones) |
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2027 return _surviving_young_words; |
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2028 } |
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2029 |
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2030 void retire_alloc_buffers() { |
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2031 for (int ap = 0; ap < GCAllocPurposeCount; ++ap) { |
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2032 size_t waste = _alloc_buffers[ap]->words_remaining(); |
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2033 add_to_alloc_buffer_waste(waste); |
| 6595 | 2034 _alloc_buffers[ap]->flush_stats_and_retire(_g1h->stats_for_purpose((GCAllocPurpose)ap), |
| 2035 true /* end_of_gc */, | |
| 2036 false /* retain */); | |
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2037 } |
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2038 } |
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2039 |
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2040 template <class T> void deal_with_reference(T* ref_to_scan) { |
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2041 if (has_partial_array_mask(ref_to_scan)) { |
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2042 _partial_scan_cl->do_oop_nv(ref_to_scan); |
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2043 } else { |
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2044 // Note: we can use "raw" versions of "region_containing" because |
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2045 // "obj_to_scan" is definitely in the heap, and is not in a |
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2046 // humongous region. |
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2047 HeapRegion* r = _g1h->heap_region_containing_raw(ref_to_scan); |
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2048 _evac_cl->set_region(r); |
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2049 _evac_cl->do_oop_nv(ref_to_scan); |
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2050 } |
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2051 } |
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2052 |
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2053 void deal_with_reference(StarTask ref) { |
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2054 assert(verify_task(ref), "sanity"); |
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2055 if (ref.is_narrow()) { |
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2056 deal_with_reference((narrowOop*)ref); |
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2057 } else { |
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2058 deal_with_reference((oop*)ref); |
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2059 } |
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2060 } |
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2061 |
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2062 void trim_queue(); |
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2063 }; |
| 1972 | 2064 |
| 2065 #endif // SHARE_VM_GC_IMPLEMENTATION_G1_G1COLLECTEDHEAP_HPP |