Mercurial > hg > truffle
annotate src/share/vm/gc_implementation/g1/g1CollectedHeap.hpp @ 4708:3c648b9ad052
7121373: Clean up CollectedHeap::is_in
Summary: Fixed G1CollectedHeap::is_in, added tests, cleaned up comments and made Space::is_in pure virtual.
Reviewed-by: brutisso, tonyp, jcoomes
| author | stefank |
|---|---|
| date | Wed, 14 Dec 2011 12:15:26 +0100 |
| parents | dc467e8b2c5e |
| children | fd2b426c30db |
| rev | line source |
|---|---|
| 342 | 1 /* |
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2 * Copyright (c) 2001, 2011, Oracle and/or its affiliates. All rights reserved. |
| 342 | 3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
| 4 * | |
| 5 * This code is free software; you can redistribute it and/or modify it | |
| 6 * under the terms of the GNU General Public License version 2 only, as | |
| 7 * published by the Free Software Foundation. | |
| 8 * | |
| 9 * This code is distributed in the hope that it will be useful, but WITHOUT | |
| 10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or | |
| 11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License | |
| 12 * version 2 for more details (a copy is included in the LICENSE file that | |
| 13 * accompanied this code). | |
| 14 * | |
| 15 * You should have received a copy of the GNU General Public License version | |
| 16 * 2 along with this work; if not, write to the Free Software Foundation, | |
| 17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. | |
| 18 * | |
|
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19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
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20 * or visit www.oracle.com if you need additional information or have any |
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21 * questions. |
| 342 | 22 * |
| 23 */ | |
| 24 | |
| 1972 | 25 #ifndef SHARE_VM_GC_IMPLEMENTATION_G1_G1COLLECTEDHEAP_HPP |
| 26 #define SHARE_VM_GC_IMPLEMENTATION_G1_G1COLLECTEDHEAP_HPP | |
| 27 | |
| 28 #include "gc_implementation/g1/concurrentMark.hpp" | |
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29 #include "gc_implementation/g1/g1AllocRegion.hpp" |
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30 #include "gc_implementation/g1/g1HRPrinter.hpp" |
| 1972 | 31 #include "gc_implementation/g1/g1RemSet.hpp" |
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32 #include "gc_implementation/g1/g1MonitoringSupport.hpp" |
| 3766 | 33 #include "gc_implementation/g1/heapRegionSeq.hpp" |
| 2152 | 34 #include "gc_implementation/g1/heapRegionSets.hpp" |
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35 #include "gc_implementation/shared/hSpaceCounters.hpp" |
| 1972 | 36 #include "gc_implementation/parNew/parGCAllocBuffer.hpp" |
| 37 #include "memory/barrierSet.hpp" | |
| 38 #include "memory/memRegion.hpp" | |
| 39 #include "memory/sharedHeap.hpp" | |
| 40 | |
| 342 | 41 // A "G1CollectedHeap" is an implementation of a java heap for HotSpot. |
| 42 // It uses the "Garbage First" heap organization and algorithm, which | |
| 43 // may combine concurrent marking with parallel, incremental compaction of | |
| 44 // heap subsets that will yield large amounts of garbage. | |
| 45 | |
| 46 class HeapRegion; | |
| 2173 | 47 class HRRSCleanupTask; |
| 342 | 48 class PermanentGenerationSpec; |
| 49 class GenerationSpec; | |
| 50 class OopsInHeapRegionClosure; | |
| 51 class G1ScanHeapEvacClosure; | |
| 52 class ObjectClosure; | |
| 53 class SpaceClosure; | |
| 54 class CompactibleSpaceClosure; | |
| 55 class Space; | |
| 56 class G1CollectorPolicy; | |
| 57 class GenRemSet; | |
| 58 class G1RemSet; | |
| 59 class HeapRegionRemSetIterator; | |
| 60 class ConcurrentMark; | |
| 61 class ConcurrentMarkThread; | |
| 62 class ConcurrentG1Refine; | |
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63 class GenerationCounters; |
| 342 | 64 |
| 1709 | 65 typedef OverflowTaskQueue<StarTask> RefToScanQueue; |
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66 typedef GenericTaskQueueSet<RefToScanQueue> RefToScanQueueSet; |
| 342 | 67 |
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68 typedef int RegionIdx_t; // needs to hold [ 0..max_regions() ) |
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69 typedef int CardIdx_t; // needs to hold [ 0..CardsPerRegion ) |
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70 |
| 342 | 71 enum GCAllocPurpose { |
| 72 GCAllocForTenured, | |
| 73 GCAllocForSurvived, | |
| 74 GCAllocPurposeCount | |
| 75 }; | |
| 76 | |
| 77 class YoungList : public CHeapObj { | |
| 78 private: | |
| 79 G1CollectedHeap* _g1h; | |
| 80 | |
| 81 HeapRegion* _head; | |
| 82 | |
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83 HeapRegion* _survivor_head; |
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84 HeapRegion* _survivor_tail; |
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85 |
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86 HeapRegion* _curr; |
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87 |
| 342 | 88 size_t _length; |
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89 size_t _survivor_length; |
| 342 | 90 |
| 91 size_t _last_sampled_rs_lengths; | |
| 92 size_t _sampled_rs_lengths; | |
| 93 | |
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94 void empty_list(HeapRegion* list); |
| 342 | 95 |
| 96 public: | |
| 97 YoungList(G1CollectedHeap* g1h); | |
| 98 | |
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99 void push_region(HeapRegion* hr); |
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100 void add_survivor_region(HeapRegion* hr); |
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101 |
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102 void empty_list(); |
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103 bool is_empty() { return _length == 0; } |
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104 size_t length() { return _length; } |
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105 size_t survivor_length() { return _survivor_length; } |
| 342 | 106 |
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107 // Currently we do not keep track of the used byte sum for the |
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108 // young list and the survivors and it'd be quite a lot of work to |
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109 // do so. When we'll eventually replace the young list with |
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110 // instances of HeapRegionLinkedList we'll get that for free. So, |
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111 // we'll report the more accurate information then. |
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112 size_t eden_used_bytes() { |
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113 assert(length() >= survivor_length(), "invariant"); |
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114 return (length() - survivor_length()) * HeapRegion::GrainBytes; |
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115 } |
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116 size_t survivor_used_bytes() { |
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117 return survivor_length() * HeapRegion::GrainBytes; |
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118 } |
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119 |
| 342 | 120 void rs_length_sampling_init(); |
| 121 bool rs_length_sampling_more(); | |
| 122 void rs_length_sampling_next(); | |
| 123 | |
| 124 void reset_sampled_info() { | |
| 125 _last_sampled_rs_lengths = 0; | |
| 126 } | |
| 127 size_t sampled_rs_lengths() { return _last_sampled_rs_lengths; } | |
| 128 | |
| 129 // for development purposes | |
| 130 void reset_auxilary_lists(); | |
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131 void clear() { _head = NULL; _length = 0; } |
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132 |
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133 void clear_survivors() { |
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134 _survivor_head = NULL; |
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135 _survivor_tail = NULL; |
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136 _survivor_length = 0; |
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137 } |
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138 |
| 342 | 139 HeapRegion* first_region() { return _head; } |
| 140 HeapRegion* first_survivor_region() { return _survivor_head; } | |
| 545 | 141 HeapRegion* last_survivor_region() { return _survivor_tail; } |
| 342 | 142 |
| 143 // debugging | |
| 144 bool check_list_well_formed(); | |
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145 bool check_list_empty(bool check_sample = true); |
| 342 | 146 void print(); |
| 147 }; | |
| 148 | |
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149 class MutatorAllocRegion : public G1AllocRegion { |
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150 protected: |
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151 virtual HeapRegion* allocate_new_region(size_t word_size, bool force); |
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152 virtual void retire_region(HeapRegion* alloc_region, size_t allocated_bytes); |
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153 public: |
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154 MutatorAllocRegion() |
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155 : G1AllocRegion("Mutator Alloc Region", false /* bot_updates */) { } |
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156 }; |
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157 |
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158 // The G1 STW is alive closure. |
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159 // An instance is embedded into the G1CH and used as the |
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160 // (optional) _is_alive_non_header closure in the STW |
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161 // reference processor. It is also extensively used during |
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162 // refence processing during STW evacuation pauses. |
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163 class G1STWIsAliveClosure: public BoolObjectClosure { |
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164 G1CollectedHeap* _g1; |
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165 public: |
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166 G1STWIsAliveClosure(G1CollectedHeap* g1) : _g1(g1) {} |
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167 void do_object(oop p) { assert(false, "Do not call."); } |
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168 bool do_object_b(oop p); |
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169 }; |
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170 |
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171 class SurvivorGCAllocRegion : public G1AllocRegion { |
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172 protected: |
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173 virtual HeapRegion* allocate_new_region(size_t word_size, bool force); |
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174 virtual void retire_region(HeapRegion* alloc_region, size_t allocated_bytes); |
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175 public: |
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176 SurvivorGCAllocRegion() |
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177 : G1AllocRegion("Survivor GC Alloc Region", false /* bot_updates */) { } |
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178 }; |
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179 |
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180 class OldGCAllocRegion : public G1AllocRegion { |
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181 protected: |
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182 virtual HeapRegion* allocate_new_region(size_t word_size, bool force); |
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183 virtual void retire_region(HeapRegion* alloc_region, size_t allocated_bytes); |
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184 public: |
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185 OldGCAllocRegion() |
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186 : G1AllocRegion("Old GC Alloc Region", true /* bot_updates */) { } |
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187 }; |
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188 |
| 342 | 189 class RefineCardTableEntryClosure; |
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190 |
| 342 | 191 class G1CollectedHeap : public SharedHeap { |
| 192 friend class VM_G1CollectForAllocation; | |
| 193 friend class VM_GenCollectForPermanentAllocation; | |
| 194 friend class VM_G1CollectFull; | |
| 195 friend class VM_G1IncCollectionPause; | |
| 196 friend class VMStructs; | |
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197 friend class MutatorAllocRegion; |
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198 friend class SurvivorGCAllocRegion; |
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199 friend class OldGCAllocRegion; |
| 342 | 200 |
| 201 // Closures used in implementation. | |
| 202 friend class G1ParCopyHelper; | |
| 203 friend class G1IsAliveClosure; | |
| 204 friend class G1EvacuateFollowersClosure; | |
| 205 friend class G1ParScanThreadState; | |
| 206 friend class G1ParScanClosureSuper; | |
| 207 friend class G1ParEvacuateFollowersClosure; | |
| 208 friend class G1ParTask; | |
| 209 friend class G1FreeGarbageRegionClosure; | |
| 210 friend class RefineCardTableEntryClosure; | |
| 211 friend class G1PrepareCompactClosure; | |
| 212 friend class RegionSorter; | |
| 2152 | 213 friend class RegionResetter; |
| 342 | 214 friend class CountRCClosure; |
| 215 friend class EvacPopObjClosure; | |
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216 friend class G1ParCleanupCTTask; |
| 342 | 217 |
| 218 // Other related classes. | |
| 219 friend class G1MarkSweep; | |
| 220 | |
| 221 private: | |
| 222 // The one and only G1CollectedHeap, so static functions can find it. | |
| 223 static G1CollectedHeap* _g1h; | |
| 224 | |
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225 static size_t _humongous_object_threshold_in_words; |
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226 |
| 342 | 227 // Storage for the G1 heap (excludes the permanent generation). |
| 228 VirtualSpace _g1_storage; | |
| 229 MemRegion _g1_reserved; | |
| 230 | |
| 231 // The part of _g1_storage that is currently committed. | |
| 232 MemRegion _g1_committed; | |
| 233 | |
| 2152 | 234 // The master free list. It will satisfy all new region allocations. |
| 235 MasterFreeRegionList _free_list; | |
| 236 | |
| 237 // The secondary free list which contains regions that have been | |
| 238 // freed up during the cleanup process. This will be appended to the | |
| 239 // master free list when appropriate. | |
| 240 SecondaryFreeRegionList _secondary_free_list; | |
| 241 | |
| 4072 | 242 // It keeps track of the old regions. |
| 243 MasterOldRegionSet _old_set; | |
| 244 | |
| 2152 | 245 // It keeps track of the humongous regions. |
| 246 MasterHumongousRegionSet _humongous_set; | |
| 342 | 247 |
| 248 // The number of regions we could create by expansion. | |
| 249 size_t _expansion_regions; | |
| 250 | |
| 251 // The block offset table for the G1 heap. | |
| 252 G1BlockOffsetSharedArray* _bot_shared; | |
| 253 | |
| 4072 | 254 // Tears down the region sets / lists so that they are empty and the |
| 255 // regions on the heap do not belong to a region set / list. The | |
| 256 // only exception is the humongous set which we leave unaltered. If | |
| 257 // free_list_only is true, it will only tear down the master free | |
| 258 // list. It is called before a Full GC (free_list_only == false) or | |
| 259 // before heap shrinking (free_list_only == true). | |
| 260 void tear_down_region_sets(bool free_list_only); | |
| 261 | |
| 262 // Rebuilds the region sets / lists so that they are repopulated to | |
| 263 // reflect the contents of the heap. The only exception is the | |
| 264 // humongous set which was not torn down in the first place. If | |
| 265 // free_list_only is true, it will only rebuild the master free | |
| 266 // list. It is called after a Full GC (free_list_only == false) or | |
| 267 // after heap shrinking (free_list_only == true). | |
| 268 void rebuild_region_sets(bool free_list_only); | |
| 342 | 269 |
| 270 // The sequence of all heap regions in the heap. | |
| 3766 | 271 HeapRegionSeq _hrs; |
| 342 | 272 |
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273 // Alloc region used to satisfy mutator allocation requests. |
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274 MutatorAllocRegion _mutator_alloc_region; |
| 342 | 275 |
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276 // Alloc region used to satisfy allocation requests by the GC for |
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277 // survivor objects. |
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278 SurvivorGCAllocRegion _survivor_gc_alloc_region; |
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279 |
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280 // Alloc region used to satisfy allocation requests by the GC for |
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281 // old objects. |
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282 OldGCAllocRegion _old_gc_alloc_region; |
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283 |
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284 // The last old region we allocated to during the last GC. |
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285 // Typically, it is not full so we should re-use it during the next GC. |
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286 HeapRegion* _retained_old_gc_alloc_region; |
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287 |
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288 // It resets the mutator alloc region before new allocations can take place. |
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289 void init_mutator_alloc_region(); |
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290 |
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291 // It releases the mutator alloc region. |
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292 void release_mutator_alloc_region(); |
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293 |
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294 // It initializes the GC alloc regions at the start of a GC. |
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295 void init_gc_alloc_regions(); |
| 342 | 296 |
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297 // It releases the GC alloc regions at the end of a GC. |
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298 void release_gc_alloc_regions(); |
| 342 | 299 |
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300 // It does any cleanup that needs to be done on the GC alloc regions |
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301 // before a Full GC. |
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302 void abandon_gc_alloc_regions(); |
| 342 | 303 |
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304 // Helper for monitoring and management support. |
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305 G1MonitoringSupport* _g1mm; |
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306 |
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307 // Determines PLAB size for a particular allocation purpose. |
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308 static size_t desired_plab_sz(GCAllocPurpose purpose); |
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309 |
| 342 | 310 // Outside of GC pauses, the number of bytes used in all regions other |
| 311 // than the current allocation region. | |
| 312 size_t _summary_bytes_used; | |
| 313 | |
| 526 | 314 // This is used for a quick test on whether a reference points into |
| 315 // the collection set or not. Basically, we have an array, with one | |
| 316 // byte per region, and that byte denotes whether the corresponding | |
| 317 // region is in the collection set or not. The entry corresponding | |
| 318 // the bottom of the heap, i.e., region 0, is pointed to by | |
| 319 // _in_cset_fast_test_base. The _in_cset_fast_test field has been | |
| 320 // biased so that it actually points to address 0 of the address | |
| 321 // space, to make the test as fast as possible (we can simply shift | |
| 322 // the address to address into it, instead of having to subtract the | |
| 323 // bottom of the heap from the address before shifting it; basically | |
| 324 // it works in the same way the card table works). | |
| 325 bool* _in_cset_fast_test; | |
| 326 | |
| 327 // The allocated array used for the fast test on whether a reference | |
| 328 // points into the collection set or not. This field is also used to | |
| 329 // free the array. | |
| 330 bool* _in_cset_fast_test_base; | |
| 331 | |
| 332 // The length of the _in_cset_fast_test_base array. | |
| 333 size_t _in_cset_fast_test_length; | |
| 334 | |
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335 volatile unsigned _gc_time_stamp; |
| 342 | 336 |
| 337 size_t* _surviving_young_words; | |
| 338 | |
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339 G1HRPrinter _hr_printer; |
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340 |
| 342 | 341 void setup_surviving_young_words(); |
| 342 void update_surviving_young_words(size_t* surv_young_words); | |
| 343 void cleanup_surviving_young_words(); | |
| 344 | |
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345 // It decides whether an explicit GC should start a concurrent cycle |
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346 // instead of doing a STW GC. Currently, a concurrent cycle is |
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347 // explicitly started if: |
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348 // (a) cause == _gc_locker and +GCLockerInvokesConcurrent, or |
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349 // (b) cause == _java_lang_system_gc and +ExplicitGCInvokesConcurrent. |
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350 bool should_do_concurrent_full_gc(GCCause::Cause cause); |
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351 |
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352 // Keeps track of how many "full collections" (i.e., Full GCs or |
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353 // concurrent cycles) we have completed. The number of them we have |
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354 // started is maintained in _total_full_collections in CollectedHeap. |
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355 volatile unsigned int _full_collections_completed; |
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356 |
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357 // This is a non-product method that is helpful for testing. It is |
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358 // called at the end of a GC and artificially expands the heap by |
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359 // allocating a number of dead regions. This way we can induce very |
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360 // frequent marking cycles and stress the cleanup / concurrent |
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361 // cleanup code more (as all the regions that will be allocated by |
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362 // this method will be found dead by the marking cycle). |
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363 void allocate_dummy_regions() PRODUCT_RETURN; |
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364 |
| 1973 | 365 // These are macros so that, if the assert fires, we get the correct |
| 366 // line number, file, etc. | |
| 367 | |
| 2361 | 368 #define heap_locking_asserts_err_msg(_extra_message_) \ |
| 2152 | 369 err_msg("%s : Heap_lock locked: %s, at safepoint: %s, is VM thread: %s", \ |
| 2361 | 370 (_extra_message_), \ |
| 2152 | 371 BOOL_TO_STR(Heap_lock->owned_by_self()), \ |
| 372 BOOL_TO_STR(SafepointSynchronize::is_at_safepoint()), \ | |
| 373 BOOL_TO_STR(Thread::current()->is_VM_thread())) | |
| 1973 | 374 |
| 375 #define assert_heap_locked() \ | |
| 376 do { \ | |
| 377 assert(Heap_lock->owned_by_self(), \ | |
| 378 heap_locking_asserts_err_msg("should be holding the Heap_lock")); \ | |
| 379 } while (0) | |
| 380 | |
| 2361 | 381 #define assert_heap_locked_or_at_safepoint(_should_be_vm_thread_) \ |
| 1973 | 382 do { \ |
| 383 assert(Heap_lock->owned_by_self() || \ | |
| 2152 | 384 (SafepointSynchronize::is_at_safepoint() && \ |
| 2361 | 385 ((_should_be_vm_thread_) == Thread::current()->is_VM_thread())), \ |
| 1973 | 386 heap_locking_asserts_err_msg("should be holding the Heap_lock or " \ |
| 387 "should be at a safepoint")); \ | |
| 388 } while (0) | |
| 389 | |
| 390 #define assert_heap_locked_and_not_at_safepoint() \ | |
| 391 do { \ | |
| 392 assert(Heap_lock->owned_by_self() && \ | |
| 393 !SafepointSynchronize::is_at_safepoint(), \ | |
| 394 heap_locking_asserts_err_msg("should be holding the Heap_lock and " \ | |
| 395 "should not be at a safepoint")); \ | |
| 396 } while (0) | |
| 397 | |
| 398 #define assert_heap_not_locked() \ | |
| 399 do { \ | |
| 400 assert(!Heap_lock->owned_by_self(), \ | |
| 401 heap_locking_asserts_err_msg("should not be holding the Heap_lock")); \ | |
| 402 } while (0) | |
| 403 | |
| 404 #define assert_heap_not_locked_and_not_at_safepoint() \ | |
| 405 do { \ | |
| 406 assert(!Heap_lock->owned_by_self() && \ | |
| 407 !SafepointSynchronize::is_at_safepoint(), \ | |
| 408 heap_locking_asserts_err_msg("should not be holding the Heap_lock and " \ | |
| 409 "should not be at a safepoint")); \ | |
| 410 } while (0) | |
| 411 | |
| 2361 | 412 #define assert_at_safepoint(_should_be_vm_thread_) \ |
| 1973 | 413 do { \ |
| 2152 | 414 assert(SafepointSynchronize::is_at_safepoint() && \ |
| 2361 | 415 ((_should_be_vm_thread_) == Thread::current()->is_VM_thread()), \ |
| 1973 | 416 heap_locking_asserts_err_msg("should be at a safepoint")); \ |
| 417 } while (0) | |
| 418 | |
| 419 #define assert_not_at_safepoint() \ | |
| 420 do { \ | |
| 421 assert(!SafepointSynchronize::is_at_safepoint(), \ | |
| 422 heap_locking_asserts_err_msg("should not be at a safepoint")); \ | |
| 423 } while (0) | |
| 424 | |
| 342 | 425 protected: |
| 426 | |
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427 // The young region list. |
| 342 | 428 YoungList* _young_list; |
| 429 | |
| 430 // The current policy object for the collector. | |
| 431 G1CollectorPolicy* _g1_policy; | |
| 432 | |
| 2152 | 433 // This is the second level of trying to allocate a new region. If |
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434 // new_region() didn't find a region on the free_list, this call will |
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435 // check whether there's anything available on the |
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436 // secondary_free_list and/or wait for more regions to appear on |
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437 // that list, if _free_regions_coming is set. |
| 2361 | 438 HeapRegion* new_region_try_secondary_free_list(); |
| 342 | 439 |
| 2361 | 440 // Try to allocate a single non-humongous HeapRegion sufficient for |
| 441 // an allocation of the given word_size. If do_expand is true, | |
| 442 // attempt to expand the heap if necessary to satisfy the allocation | |
| 443 // request. | |
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444 HeapRegion* new_region(size_t word_size, bool do_expand); |
| 342 | 445 |
| 2361 | 446 // Attempt to satisfy a humongous allocation request of the given |
| 447 // size by finding a contiguous set of free regions of num_regions | |
| 448 // length and remove them from the master free list. Return the | |
| 3766 | 449 // index of the first region or G1_NULL_HRS_INDEX if the search |
| 450 // was unsuccessful. | |
| 451 size_t humongous_obj_allocate_find_first(size_t num_regions, | |
| 452 size_t word_size); | |
| 342 | 453 |
| 2361 | 454 // Initialize a contiguous set of free regions of length num_regions |
| 455 // and starting at index first so that they appear as a single | |
| 456 // humongous region. | |
| 3766 | 457 HeapWord* humongous_obj_allocate_initialize_regions(size_t first, |
| 2361 | 458 size_t num_regions, |
| 459 size_t word_size); | |
| 460 | |
| 461 // Attempt to allocate a humongous object of the given size. Return | |
| 462 // NULL if unsuccessful. | |
| 2152 | 463 HeapWord* humongous_obj_allocate(size_t word_size); |
| 1973 | 464 |
| 465 // The following two methods, allocate_new_tlab() and | |
| 466 // mem_allocate(), are the two main entry points from the runtime | |
| 467 // into the G1's allocation routines. They have the following | |
| 468 // assumptions: | |
| 469 // | |
| 470 // * They should both be called outside safepoints. | |
| 471 // | |
| 472 // * They should both be called without holding the Heap_lock. | |
| 473 // | |
| 474 // * All allocation requests for new TLABs should go to | |
| 475 // allocate_new_tlab(). | |
| 476 // | |
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477 // * All non-TLAB allocation requests should go to mem_allocate(). |
| 1973 | 478 // |
| 479 // * If either call cannot satisfy the allocation request using the | |
| 480 // current allocating region, they will try to get a new one. If | |
| 481 // this fails, they will attempt to do an evacuation pause and | |
| 482 // retry the allocation. | |
| 483 // | |
| 484 // * If all allocation attempts fail, even after trying to schedule | |
| 485 // an evacuation pause, allocate_new_tlab() will return NULL, | |
| 486 // whereas mem_allocate() will attempt a heap expansion and/or | |
| 487 // schedule a Full GC. | |
| 488 // | |
| 489 // * We do not allow humongous-sized TLABs. So, allocate_new_tlab | |
| 490 // should never be called with word_size being humongous. All | |
| 491 // humongous allocation requests should go to mem_allocate() which | |
| 492 // will satisfy them with a special path. | |
| 493 | |
| 494 virtual HeapWord* allocate_new_tlab(size_t word_size); | |
| 495 | |
| 496 virtual HeapWord* mem_allocate(size_t word_size, | |
| 497 bool* gc_overhead_limit_was_exceeded); | |
| 342 | 498 |
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499 // The following three methods take a gc_count_before_ret |
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500 // parameter which is used to return the GC count if the method |
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501 // returns NULL. Given that we are required to read the GC count |
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502 // while holding the Heap_lock, and these paths will take the |
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503 // Heap_lock at some point, it's easier to get them to read the GC |
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504 // count while holding the Heap_lock before they return NULL instead |
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505 // of the caller (namely: mem_allocate()) having to also take the |
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506 // Heap_lock just to read the GC count. |
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507 |
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508 // First-level mutator allocation attempt: try to allocate out of |
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509 // the mutator alloc region without taking the Heap_lock. This |
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510 // should only be used for non-humongous allocations. |
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511 inline HeapWord* attempt_allocation(size_t word_size, |
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512 unsigned int* gc_count_before_ret); |
| 342 | 513 |
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514 // Second-level mutator allocation attempt: take the Heap_lock and |
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515 // retry the allocation attempt, potentially scheduling a GC |
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516 // pause. This should only be used for non-humongous allocations. |
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517 HeapWord* attempt_allocation_slow(size_t word_size, |
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518 unsigned int* gc_count_before_ret); |
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519 |
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520 // Takes the Heap_lock and attempts a humongous allocation. It can |
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521 // potentially schedule a GC pause. |
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522 HeapWord* attempt_allocation_humongous(size_t word_size, |
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523 unsigned int* gc_count_before_ret); |
| 1973 | 524 |
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525 // Allocation attempt that should be called during safepoints (e.g., |
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526 // at the end of a successful GC). expect_null_mutator_alloc_region |
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527 // specifies whether the mutator alloc region is expected to be NULL |
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528 // or not. |
| 1973 | 529 HeapWord* attempt_allocation_at_safepoint(size_t word_size, |
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530 bool expect_null_mutator_alloc_region); |
| 1973 | 531 |
| 532 // It dirties the cards that cover the block so that so that the post | |
| 533 // write barrier never queues anything when updating objects on this | |
| 534 // block. It is assumed (and in fact we assert) that the block | |
| 535 // belongs to a young region. | |
| 536 inline void dirty_young_block(HeapWord* start, size_t word_size); | |
| 342 | 537 |
| 538 // Allocate blocks during garbage collection. Will ensure an | |
| 539 // allocation region, either by picking one or expanding the | |
| 540 // heap, and then allocate a block of the given size. The block | |
| 541 // may not be a humongous - it must fit into a single heap region. | |
| 542 HeapWord* par_allocate_during_gc(GCAllocPurpose purpose, size_t word_size); | |
| 543 | |
| 544 HeapWord* allocate_during_gc_slow(GCAllocPurpose purpose, | |
| 545 HeapRegion* alloc_region, | |
| 546 bool par, | |
| 547 size_t word_size); | |
| 548 | |
| 549 // Ensure that no further allocations can happen in "r", bearing in mind | |
| 550 // that parallel threads might be attempting allocations. | |
| 551 void par_allocate_remaining_space(HeapRegion* r); | |
| 552 | |
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553 // Allocation attempt during GC for a survivor object / PLAB. |
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554 inline HeapWord* survivor_attempt_allocation(size_t word_size); |
| 545 | 555 |
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556 // Allocation attempt during GC for an old object / PLAB. |
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557 inline HeapWord* old_attempt_allocation(size_t word_size); |
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558 |
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559 // These methods are the "callbacks" from the G1AllocRegion class. |
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560 |
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561 // For mutator alloc regions. |
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562 HeapRegion* new_mutator_alloc_region(size_t word_size, bool force); |
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563 void retire_mutator_alloc_region(HeapRegion* alloc_region, |
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564 size_t allocated_bytes); |
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565 |
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566 // For GC alloc regions. |
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567 HeapRegion* new_gc_alloc_region(size_t word_size, size_t count, |
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568 GCAllocPurpose ap); |
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569 void retire_gc_alloc_region(HeapRegion* alloc_region, |
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570 size_t allocated_bytes, GCAllocPurpose ap); |
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571 |
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572 // - if explicit_gc is true, the GC is for a System.gc() or a heap |
| 1973 | 573 // inspection request and should collect the entire heap |
| 574 // - if clear_all_soft_refs is true, all soft references should be | |
| 575 // cleared during the GC | |
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576 // - if explicit_gc is false, word_size describes the allocation that |
| 1973 | 577 // the GC should attempt (at least) to satisfy |
| 578 // - it returns false if it is unable to do the collection due to the | |
| 579 // GC locker being active, true otherwise | |
| 580 bool do_collection(bool explicit_gc, | |
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581 bool clear_all_soft_refs, |
| 342 | 582 size_t word_size); |
| 583 | |
| 584 // Callback from VM_G1CollectFull operation. | |
| 585 // Perform a full collection. | |
| 586 void do_full_collection(bool clear_all_soft_refs); | |
| 587 | |
| 588 // Resize the heap if necessary after a full collection. If this is | |
| 589 // after a collect-for allocation, "word_size" is the allocation size, | |
| 590 // and will be considered part of the used portion of the heap. | |
| 591 void resize_if_necessary_after_full_collection(size_t word_size); | |
| 592 | |
| 593 // Callback from VM_G1CollectForAllocation operation. | |
| 594 // This function does everything necessary/possible to satisfy a | |
| 595 // failed allocation request (including collection, expansion, etc.) | |
| 1973 | 596 HeapWord* satisfy_failed_allocation(size_t word_size, bool* succeeded); |
| 342 | 597 |
| 598 // Attempting to expand the heap sufficiently | |
| 599 // to support an allocation of the given "word_size". If | |
| 600 // successful, perform the allocation and return the address of the | |
| 601 // allocated block, or else "NULL". | |
| 1973 | 602 HeapWord* expand_and_allocate(size_t word_size); |
| 342 | 603 |
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604 // Process any reference objects discovered during |
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605 // an incremental evacuation pause. |
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606 void process_discovered_references(); |
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607 |
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608 // Enqueue any remaining discovered references |
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609 // after processing. |
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610 void enqueue_discovered_references(); |
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611 |
| 342 | 612 public: |
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613 |
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614 G1MonitoringSupport* g1mm() { |
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615 assert(_g1mm != NULL, "should have been initialized"); |
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616 return _g1mm; |
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617 } |
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618 |
| 342 | 619 // Expand the garbage-first heap by at least the given size (in bytes!). |
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620 // Returns true if the heap was expanded by the requested amount; |
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621 // false otherwise. |
| 342 | 622 // (Rounds up to a HeapRegion boundary.) |
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623 bool expand(size_t expand_bytes); |
| 342 | 624 |
| 625 // Do anything common to GC's. | |
| 626 virtual void gc_prologue(bool full); | |
| 627 virtual void gc_epilogue(bool full); | |
| 628 | |
| 526 | 629 // We register a region with the fast "in collection set" test. We |
| 630 // simply set to true the array slot corresponding to this region. | |
| 631 void register_region_with_in_cset_fast_test(HeapRegion* r) { | |
| 632 assert(_in_cset_fast_test_base != NULL, "sanity"); | |
| 633 assert(r->in_collection_set(), "invariant"); | |
| 3766 | 634 size_t index = r->hrs_index(); |
| 635 assert(index < _in_cset_fast_test_length, "invariant"); | |
| 526 | 636 assert(!_in_cset_fast_test_base[index], "invariant"); |
| 637 _in_cset_fast_test_base[index] = true; | |
| 638 } | |
| 639 | |
| 640 // This is a fast test on whether a reference points into the | |
| 641 // collection set or not. It does not assume that the reference | |
| 642 // points into the heap; if it doesn't, it will return false. | |
| 643 bool in_cset_fast_test(oop obj) { | |
| 644 assert(_in_cset_fast_test != NULL, "sanity"); | |
| 645 if (_g1_committed.contains((HeapWord*) obj)) { | |
| 646 // no need to subtract the bottom of the heap from obj, | |
| 647 // _in_cset_fast_test is biased | |
| 648 size_t index = ((size_t) obj) >> HeapRegion::LogOfHRGrainBytes; | |
| 649 bool ret = _in_cset_fast_test[index]; | |
| 650 // let's make sure the result is consistent with what the slower | |
| 651 // test returns | |
| 652 assert( ret || !obj_in_cs(obj), "sanity"); | |
| 653 assert(!ret || obj_in_cs(obj), "sanity"); | |
| 654 return ret; | |
| 655 } else { | |
| 656 return false; | |
| 657 } | |
| 658 } | |
| 659 | |
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660 void clear_cset_fast_test() { |
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661 assert(_in_cset_fast_test_base != NULL, "sanity"); |
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662 memset(_in_cset_fast_test_base, false, |
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663 _in_cset_fast_test_length * sizeof(bool)); |
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664 } |
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665 |
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666 // This is called at the end of either a concurrent cycle or a Full |
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667 // GC to update the number of full collections completed. Those two |
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668 // can happen in a nested fashion, i.e., we start a concurrent |
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669 // cycle, a Full GC happens half-way through it which ends first, |
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670 // and then the cycle notices that a Full GC happened and ends |
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671 // too. The concurrent parameter is a boolean to help us do a bit |
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672 // tighter consistency checking in the method. If concurrent is |
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673 // false, the caller is the inner caller in the nesting (i.e., the |
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674 // Full GC). If concurrent is true, the caller is the outer caller |
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675 // in this nesting (i.e., the concurrent cycle). Further nesting is |
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676 // not currently supported. The end of the this call also notifies |
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677 // the FullGCCount_lock in case a Java thread is waiting for a full |
|
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678 // GC to happen (e.g., it called System.gc() with |
|
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679 // +ExplicitGCInvokesConcurrent). |
|
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680 void increment_full_collections_completed(bool concurrent); |
|
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681 |
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682 unsigned int full_collections_completed() { |
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683 return _full_collections_completed; |
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684 } |
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685 |
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686 G1HRPrinter* hr_printer() { return &_hr_printer; } |
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687 |
| 342 | 688 protected: |
| 689 | |
| 690 // Shrink the garbage-first heap by at most the given size (in bytes!). | |
| 691 // (Rounds down to a HeapRegion boundary.) | |
| 692 virtual void shrink(size_t expand_bytes); | |
| 693 void shrink_helper(size_t expand_bytes); | |
| 694 | |
| 1709 | 695 #if TASKQUEUE_STATS |
| 696 static void print_taskqueue_stats_hdr(outputStream* const st = gclog_or_tty); | |
| 697 void print_taskqueue_stats(outputStream* const st = gclog_or_tty) const; | |
| 698 void reset_taskqueue_stats(); | |
| 699 #endif // TASKQUEUE_STATS | |
| 700 | |
| 1973 | 701 // Schedule the VM operation that will do an evacuation pause to |
| 702 // satisfy an allocation request of word_size. *succeeded will | |
| 703 // return whether the VM operation was successful (it did do an | |
| 704 // evacuation pause) or not (another thread beat us to it or the GC | |
| 705 // locker was active). Given that we should not be holding the | |
| 706 // Heap_lock when we enter this method, we will pass the | |
| 707 // gc_count_before (i.e., total_collections()) as a parameter since | |
| 708 // it has to be read while holding the Heap_lock. Currently, both | |
| 709 // methods that call do_collection_pause() release the Heap_lock | |
| 710 // before the call, so it's easy to read gc_count_before just before. | |
| 711 HeapWord* do_collection_pause(size_t word_size, | |
| 712 unsigned int gc_count_before, | |
| 713 bool* succeeded); | |
| 342 | 714 |
| 715 // The guts of the incremental collection pause, executed by the vm | |
| 1973 | 716 // thread. It returns false if it is unable to do the collection due |
| 717 // to the GC locker being active, true otherwise | |
| 718 bool do_collection_pause_at_safepoint(double target_pause_time_ms); | |
| 342 | 719 |
| 720 // Actually do the work of evacuating the collection set. | |
| 1973 | 721 void evacuate_collection_set(); |
| 342 | 722 |
| 723 // The g1 remembered set of the heap. | |
| 724 G1RemSet* _g1_rem_set; | |
| 725 // And it's mod ref barrier set, used to track updates for the above. | |
| 726 ModRefBarrierSet* _mr_bs; | |
| 727 | |
|
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728 // A set of cards that cover the objects for which the Rsets should be updated |
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729 // concurrently after the collection. |
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730 DirtyCardQueueSet _dirty_card_queue_set; |
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731 |
| 342 | 732 // The Heap Region Rem Set Iterator. |
| 733 HeapRegionRemSetIterator** _rem_set_iterator; | |
| 734 | |
| 735 // The closure used to refine a single card. | |
| 736 RefineCardTableEntryClosure* _refine_cte_cl; | |
| 737 | |
| 738 // A function to check the consistency of dirty card logs. | |
| 739 void check_ct_logs_at_safepoint(); | |
| 740 | |
| 1705 | 741 // A DirtyCardQueueSet that is used to hold cards that contain |
| 742 // references into the current collection set. This is used to | |
| 743 // update the remembered sets of the regions in the collection | |
| 744 // set in the event of an evacuation failure. | |
| 745 DirtyCardQueueSet _into_cset_dirty_card_queue_set; | |
| 746 | |
| 342 | 747 // After a collection pause, make the regions in the CS into free |
| 748 // regions. | |
| 749 void free_collection_set(HeapRegion* cs_head); | |
| 750 | |
|
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751 // Abandon the current collection set without recording policy |
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752 // statistics or updating free lists. |
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753 void abandon_collection_set(HeapRegion* cs_head); |
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754 |
| 342 | 755 // Applies "scan_non_heap_roots" to roots outside the heap, |
| 756 // "scan_rs" to roots inside the heap (having done "set_region" to | |
| 757 // indicate the region in which the root resides), and does "scan_perm" | |
| 758 // (setting the generation to the perm generation.) If "scan_rs" is | |
| 759 // NULL, then this step is skipped. The "worker_i" | |
| 760 // param is for use with parallel roots processing, and should be | |
| 761 // the "i" of the calling parallel worker thread's work(i) function. | |
| 762 // In the sequential case this param will be ignored. | |
| 763 void g1_process_strong_roots(bool collecting_perm_gen, | |
| 764 SharedHeap::ScanningOption so, | |
| 765 OopClosure* scan_non_heap_roots, | |
| 766 OopsInHeapRegionClosure* scan_rs, | |
| 767 OopsInGenClosure* scan_perm, | |
| 768 int worker_i); | |
| 769 | |
| 770 // Apply "blk" to all the weak roots of the system. These include | |
| 771 // JNI weak roots, the code cache, system dictionary, symbol table, | |
| 772 // string table, and referents of reachable weak refs. | |
| 773 void g1_process_weak_roots(OopClosure* root_closure, | |
| 774 OopClosure* non_root_closure); | |
| 775 | |
| 2361 | 776 // Frees a non-humongous region by initializing its contents and |
| 2152 | 777 // adding it to the free list that's passed as a parameter (this is |
| 778 // usually a local list which will be appended to the master free | |
| 779 // list later). The used bytes of freed regions are accumulated in | |
| 780 // pre_used. If par is true, the region's RSet will not be freed | |
| 781 // up. The assumption is that this will be done later. | |
| 782 void free_region(HeapRegion* hr, | |
| 783 size_t* pre_used, | |
| 784 FreeRegionList* free_list, | |
| 785 bool par); | |
| 342 | 786 |
| 2361 | 787 // Frees a humongous region by collapsing it into individual regions |
| 788 // and calling free_region() for each of them. The freed regions | |
| 789 // will be added to the free list that's passed as a parameter (this | |
| 790 // is usually a local list which will be appended to the master free | |
| 791 // list later). The used bytes of freed regions are accumulated in | |
| 792 // pre_used. If par is true, the region's RSet will not be freed | |
| 793 // up. The assumption is that this will be done later. | |
| 2152 | 794 void free_humongous_region(HeapRegion* hr, |
| 795 size_t* pre_used, | |
| 796 FreeRegionList* free_list, | |
| 797 HumongousRegionSet* humongous_proxy_set, | |
| 798 bool par); | |
| 342 | 799 |
| 3766 | 800 // Notifies all the necessary spaces that the committed space has |
| 801 // been updated (either expanded or shrunk). It should be called | |
| 802 // after _g1_storage is updated. | |
| 803 void update_committed_space(HeapWord* old_end, HeapWord* new_end); | |
| 804 | |
| 342 | 805 // The concurrent marker (and the thread it runs in.) |
| 806 ConcurrentMark* _cm; | |
| 807 ConcurrentMarkThread* _cmThread; | |
| 808 bool _mark_in_progress; | |
| 809 | |
| 810 // The concurrent refiner. | |
| 811 ConcurrentG1Refine* _cg1r; | |
| 812 | |
| 813 // The parallel task queues | |
| 814 RefToScanQueueSet *_task_queues; | |
| 815 | |
| 816 // True iff a evacuation has failed in the current collection. | |
| 817 bool _evacuation_failed; | |
| 818 | |
| 819 // Set the attribute indicating whether evacuation has failed in the | |
| 820 // current collection. | |
| 821 void set_evacuation_failed(bool b) { _evacuation_failed = b; } | |
| 822 | |
| 823 // Failed evacuations cause some logical from-space objects to have | |
| 824 // forwarding pointers to themselves. Reset them. | |
| 825 void remove_self_forwarding_pointers(); | |
| 826 | |
| 827 // When one is non-null, so is the other. Together, they each pair is | |
| 828 // an object with a preserved mark, and its mark value. | |
| 829 GrowableArray<oop>* _objs_with_preserved_marks; | |
| 830 GrowableArray<markOop>* _preserved_marks_of_objs; | |
| 831 | |
| 832 // Preserve the mark of "obj", if necessary, in preparation for its mark | |
| 833 // word being overwritten with a self-forwarding-pointer. | |
| 834 void preserve_mark_if_necessary(oop obj, markOop m); | |
| 835 | |
| 836 // The stack of evac-failure objects left to be scanned. | |
| 837 GrowableArray<oop>* _evac_failure_scan_stack; | |
| 838 // The closure to apply to evac-failure objects. | |
| 839 | |
| 840 OopsInHeapRegionClosure* _evac_failure_closure; | |
| 841 // Set the field above. | |
| 842 void | |
| 843 set_evac_failure_closure(OopsInHeapRegionClosure* evac_failure_closure) { | |
| 844 _evac_failure_closure = evac_failure_closure; | |
| 845 } | |
| 846 | |
| 847 // Push "obj" on the scan stack. | |
| 848 void push_on_evac_failure_scan_stack(oop obj); | |
| 849 // Process scan stack entries until the stack is empty. | |
| 850 void drain_evac_failure_scan_stack(); | |
| 851 // True iff an invocation of "drain_scan_stack" is in progress; to | |
| 852 // prevent unnecessary recursion. | |
| 853 bool _drain_in_progress; | |
| 854 | |
| 855 // Do any necessary initialization for evacuation-failure handling. | |
| 856 // "cl" is the closure that will be used to process evac-failure | |
| 857 // objects. | |
| 858 void init_for_evac_failure(OopsInHeapRegionClosure* cl); | |
| 859 // Do any necessary cleanup for evacuation-failure handling data | |
| 860 // structures. | |
| 861 void finalize_for_evac_failure(); | |
| 862 | |
| 863 // An attempt to evacuate "obj" has failed; take necessary steps. | |
|
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864 oop handle_evacuation_failure_par(OopsInHeapRegionClosure* cl, oop obj, |
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865 bool should_mark_root); |
| 342 | 866 void handle_evacuation_failure_common(oop obj, markOop m); |
| 867 | |
|
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868 // ("Weak") Reference processing support. |
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869 // |
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870 // G1 has 2 instances of the referece processor class. One |
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871 // (_ref_processor_cm) handles reference object discovery |
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872 // and subsequent processing during concurrent marking cycles. |
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873 // |
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874 // The other (_ref_processor_stw) handles reference object |
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875 // discovery and processing during full GCs and incremental |
|
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876 // evacuation pauses. |
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877 // |
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878 // During an incremental pause, reference discovery will be |
|
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879 // temporarily disabled for _ref_processor_cm and will be |
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880 // enabled for _ref_processor_stw. At the end of the evacuation |
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881 // pause references discovered by _ref_processor_stw will be |
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882 // processed and discovery will be disabled. The previous |
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883 // setting for reference object discovery for _ref_processor_cm |
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884 // will be re-instated. |
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885 // |
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886 // At the start of marking: |
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887 // * Discovery by the CM ref processor is verified to be inactive |
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888 // and it's discovered lists are empty. |
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889 // * Discovery by the CM ref processor is then enabled. |
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890 // |
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891 // At the end of marking: |
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892 // * Any references on the CM ref processor's discovered |
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893 // lists are processed (possibly MT). |
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894 // |
|
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895 // At the start of full GC we: |
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896 // * Disable discovery by the CM ref processor and |
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897 // empty CM ref processor's discovered lists |
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898 // (without processing any entries). |
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899 // * Verify that the STW ref processor is inactive and it's |
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900 // discovered lists are empty. |
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901 // * Temporarily set STW ref processor discovery as single threaded. |
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902 // * Temporarily clear the STW ref processor's _is_alive_non_header |
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903 // field. |
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904 // * Finally enable discovery by the STW ref processor. |
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905 // |
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906 // The STW ref processor is used to record any discovered |
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907 // references during the full GC. |
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908 // |
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909 // At the end of a full GC we: |
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910 // * Enqueue any reference objects discovered by the STW ref processor |
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911 // that have non-live referents. This has the side-effect of |
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912 // making the STW ref processor inactive by disabling discovery. |
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913 // * Verify that the CM ref processor is still inactive |
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914 // and no references have been placed on it's discovered |
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915 // lists (also checked as a precondition during initial marking). |
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916 |
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917 // The (stw) reference processor... |
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918 ReferenceProcessor* _ref_processor_stw; |
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919 |
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920 // During reference object discovery, the _is_alive_non_header |
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921 // closure (if non-null) is applied to the referent object to |
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922 // determine whether the referent is live. If so then the |
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923 // reference object does not need to be 'discovered' and can |
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924 // be treated as a regular oop. This has the benefit of reducing |
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925 // the number of 'discovered' reference objects that need to |
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926 // be processed. |
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927 // |
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928 // Instance of the is_alive closure for embedding into the |
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929 // STW reference processor as the _is_alive_non_header field. |
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930 // Supplying a value for the _is_alive_non_header field is |
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931 // optional but doing so prevents unnecessary additions to |
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932 // the discovered lists during reference discovery. |
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933 G1STWIsAliveClosure _is_alive_closure_stw; |
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934 |
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935 // The (concurrent marking) reference processor... |
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936 ReferenceProcessor* _ref_processor_cm; |
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937 |
|
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938 // Instance of the concurrent mark is_alive closure for embedding |
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939 // into the Concurrent Marking reference processor as the |
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940 // _is_alive_non_header field. Supplying a value for the |
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941 // _is_alive_non_header field is optional but doing so prevents |
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942 // unnecessary additions to the discovered lists during reference |
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943 // discovery. |
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944 G1CMIsAliveClosure _is_alive_closure_cm; |
| 342 | 945 |
| 946 enum G1H_process_strong_roots_tasks { | |
| 947 G1H_PS_mark_stack_oops_do, | |
| 948 G1H_PS_refProcessor_oops_do, | |
| 949 // Leave this one last. | |
| 950 G1H_PS_NumElements | |
| 951 }; | |
| 952 | |
| 953 SubTasksDone* _process_strong_tasks; | |
| 954 | |
| 2152 | 955 volatile bool _free_regions_coming; |
| 342 | 956 |
| 957 public: | |
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958 |
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959 SubTasksDone* process_strong_tasks() { return _process_strong_tasks; } |
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960 |
| 342 | 961 void set_refine_cte_cl_concurrency(bool concurrent); |
| 962 | |
| 1709 | 963 RefToScanQueue *task_queue(int i) const; |
| 342 | 964 |
|
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965 // A set of cards where updates happened during the GC |
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966 DirtyCardQueueSet& dirty_card_queue_set() { return _dirty_card_queue_set; } |
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967 |
| 1705 | 968 // A DirtyCardQueueSet that is used to hold cards that contain |
| 969 // references into the current collection set. This is used to | |
| 970 // update the remembered sets of the regions in the collection | |
| 971 // set in the event of an evacuation failure. | |
| 972 DirtyCardQueueSet& into_cset_dirty_card_queue_set() | |
| 973 { return _into_cset_dirty_card_queue_set; } | |
| 974 | |
| 342 | 975 // Create a G1CollectedHeap with the specified policy. |
| 976 // Must call the initialize method afterwards. | |
| 977 // May not return if something goes wrong. | |
| 978 G1CollectedHeap(G1CollectorPolicy* policy); | |
| 979 | |
| 980 // Initialize the G1CollectedHeap to have the initial and | |
| 981 // maximum sizes, permanent generation, and remembered and barrier sets | |
| 982 // specified by the policy object. | |
| 983 jint initialize(); | |
| 984 | |
|
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985 // Initialize weak reference processing. |
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986 virtual void ref_processing_init(); |
| 342 | 987 |
| 988 void set_par_threads(int t) { | |
| 989 SharedHeap::set_par_threads(t); | |
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990 // Done in SharedHeap but oddly there are |
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991 // two _process_strong_tasks's in a G1CollectedHeap |
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992 // so do it here too. |
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993 _process_strong_tasks->set_n_threads(t); |
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994 } |
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995 |
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996 // Set _n_par_threads according to a policy TBD. |
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997 void set_par_threads(); |
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998 |
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999 void set_n_termination(int t) { |
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1000 _process_strong_tasks->set_n_threads(t); |
| 342 | 1001 } |
| 1002 | |
| 1003 virtual CollectedHeap::Name kind() const { | |
| 1004 return CollectedHeap::G1CollectedHeap; | |
| 1005 } | |
| 1006 | |
| 1007 // The current policy object for the collector. | |
| 1008 G1CollectorPolicy* g1_policy() const { return _g1_policy; } | |
| 1009 | |
| 1010 // Adaptive size policy. No such thing for g1. | |
| 1011 virtual AdaptiveSizePolicy* size_policy() { return NULL; } | |
| 1012 | |
| 1013 // The rem set and barrier set. | |
| 1014 G1RemSet* g1_rem_set() const { return _g1_rem_set; } | |
| 1015 ModRefBarrierSet* mr_bs() const { return _mr_bs; } | |
| 1016 | |
| 1017 // The rem set iterator. | |
| 1018 HeapRegionRemSetIterator* rem_set_iterator(int i) { | |
| 1019 return _rem_set_iterator[i]; | |
| 1020 } | |
| 1021 | |
| 1022 HeapRegionRemSetIterator* rem_set_iterator() { | |
| 1023 return _rem_set_iterator[0]; | |
| 1024 } | |
| 1025 | |
| 1026 unsigned get_gc_time_stamp() { | |
| 1027 return _gc_time_stamp; | |
| 1028 } | |
| 1029 | |
| 1030 void reset_gc_time_stamp() { | |
| 1031 _gc_time_stamp = 0; | |
|
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1032 OrderAccess::fence(); |
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1033 } |
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1034 |
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1035 void increment_gc_time_stamp() { |
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1036 ++_gc_time_stamp; |
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1037 OrderAccess::fence(); |
| 342 | 1038 } |
| 1039 | |
| 1705 | 1040 void iterate_dirty_card_closure(CardTableEntryClosure* cl, |
| 1041 DirtyCardQueue* into_cset_dcq, | |
| 1042 bool concurrent, int worker_i); | |
| 342 | 1043 |
| 1044 // The shared block offset table array. | |
| 1045 G1BlockOffsetSharedArray* bot_shared() const { return _bot_shared; } | |
| 1046 | |
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1047 // Reference Processing accessors |
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1048 |
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1049 // The STW reference processor.... |
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1050 ReferenceProcessor* ref_processor_stw() const { return _ref_processor_stw; } |
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1051 |
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1052 // The Concurent Marking reference processor... |
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1053 ReferenceProcessor* ref_processor_cm() const { return _ref_processor_cm; } |
| 342 | 1054 |
| 1055 virtual size_t capacity() const; | |
| 1056 virtual size_t used() const; | |
|
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1057 // This should be called when we're not holding the heap lock. The |
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1058 // result might be a bit inaccurate. |
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1059 size_t used_unlocked() const; |
| 342 | 1060 size_t recalculate_used() const; |
| 1061 | |
| 1062 // These virtual functions do the actual allocation. | |
| 1063 // Some heaps may offer a contiguous region for shared non-blocking | |
| 1064 // allocation, via inlined code (by exporting the address of the top and | |
| 1065 // end fields defining the extent of the contiguous allocation region.) | |
| 1066 // But G1CollectedHeap doesn't yet support this. | |
| 1067 | |
| 1068 // Return an estimate of the maximum allocation that could be performed | |
| 1069 // without triggering any collection or expansion activity. In a | |
| 1070 // generational collector, for example, this is probably the largest | |
| 1071 // allocation that could be supported (without expansion) in the youngest | |
| 1072 // generation. It is "unsafe" because no locks are taken; the result | |
| 1073 // should be treated as an approximation, not a guarantee, for use in | |
| 1074 // heuristic resizing decisions. | |
| 1075 virtual size_t unsafe_max_alloc(); | |
| 1076 | |
| 1077 virtual bool is_maximal_no_gc() const { | |
| 1078 return _g1_storage.uncommitted_size() == 0; | |
| 1079 } | |
| 1080 | |
| 1081 // The total number of regions in the heap. | |
| 3766 | 1082 size_t n_regions() { return _hrs.length(); } |
| 1083 | |
| 1084 // The max number of regions in the heap. | |
| 1085 size_t max_regions() { return _hrs.max_length(); } | |
| 342 | 1086 |
| 1087 // The number of regions that are completely free. | |
| 3766 | 1088 size_t free_regions() { return _free_list.length(); } |
| 342 | 1089 |
| 1090 // The number of regions that are not completely free. | |
| 1091 size_t used_regions() { return n_regions() - free_regions(); } | |
| 1092 | |
| 1093 // The number of regions available for "regular" expansion. | |
| 1094 size_t expansion_regions() { return _expansion_regions; } | |
| 1095 | |
| 3766 | 1096 // Factory method for HeapRegion instances. It will return NULL if |
| 1097 // the allocation fails. | |
| 1098 HeapRegion* new_heap_region(size_t hrs_index, HeapWord* bottom); | |
| 1099 | |
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1100 void verify_not_dirty_region(HeapRegion* hr) PRODUCT_RETURN; |
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1101 void verify_dirty_region(HeapRegion* hr) PRODUCT_RETURN; |
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1102 void verify_dirty_young_list(HeapRegion* head) PRODUCT_RETURN; |
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1103 void verify_dirty_young_regions() PRODUCT_RETURN; |
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1104 |
| 2152 | 1105 // verify_region_sets() performs verification over the region |
| 1106 // lists. It will be compiled in the product code to be used when | |
| 1107 // necessary (i.e., during heap verification). | |
| 1108 void verify_region_sets(); | |
| 342 | 1109 |
| 2152 | 1110 // verify_region_sets_optional() is planted in the code for |
| 1111 // list verification in non-product builds (and it can be enabled in | |
| 1112 // product builds by definning HEAP_REGION_SET_FORCE_VERIFY to be 1). | |
| 1113 #if HEAP_REGION_SET_FORCE_VERIFY | |
| 1114 void verify_region_sets_optional() { | |
| 1115 verify_region_sets(); | |
| 1116 } | |
| 1117 #else // HEAP_REGION_SET_FORCE_VERIFY | |
| 1118 void verify_region_sets_optional() { } | |
| 1119 #endif // HEAP_REGION_SET_FORCE_VERIFY | |
| 342 | 1120 |
| 2152 | 1121 #ifdef ASSERT |
| 2361 | 1122 bool is_on_master_free_list(HeapRegion* hr) { |
| 2152 | 1123 return hr->containing_set() == &_free_list; |
| 1124 } | |
| 342 | 1125 |
| 2361 | 1126 bool is_in_humongous_set(HeapRegion* hr) { |
| 2152 | 1127 return hr->containing_set() == &_humongous_set; |
| 2361 | 1128 } |
| 2152 | 1129 #endif // ASSERT |
| 342 | 1130 |
| 2152 | 1131 // Wrapper for the region list operations that can be called from |
| 1132 // methods outside this class. | |
| 342 | 1133 |
| 2152 | 1134 void secondary_free_list_add_as_tail(FreeRegionList* list) { |
| 1135 _secondary_free_list.add_as_tail(list); | |
| 1136 } | |
| 342 | 1137 |
| 2152 | 1138 void append_secondary_free_list() { |
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1139 _free_list.add_as_head(&_secondary_free_list); |
| 2152 | 1140 } |
| 342 | 1141 |
| 2361 | 1142 void append_secondary_free_list_if_not_empty_with_lock() { |
| 1143 // If the secondary free list looks empty there's no reason to | |
| 1144 // take the lock and then try to append it. | |
| 2152 | 1145 if (!_secondary_free_list.is_empty()) { |
| 1146 MutexLockerEx x(SecondaryFreeList_lock, Mutex::_no_safepoint_check_flag); | |
| 1147 append_secondary_free_list(); | |
| 1148 } | |
| 1149 } | |
| 342 | 1150 |
| 4072 | 1151 void old_set_remove(HeapRegion* hr) { |
| 1152 _old_set.remove(hr); | |
| 1153 } | |
| 1154 | |
| 2152 | 1155 void set_free_regions_coming(); |
| 1156 void reset_free_regions_coming(); | |
| 1157 bool free_regions_coming() { return _free_regions_coming; } | |
| 1158 void wait_while_free_regions_coming(); | |
| 342 | 1159 |
| 1160 // Perform a collection of the heap; intended for use in implementing | |
| 1161 // "System.gc". This probably implies as full a collection as the | |
| 1162 // "CollectedHeap" supports. | |
| 1163 virtual void collect(GCCause::Cause cause); | |
| 1164 | |
| 1165 // The same as above but assume that the caller holds the Heap_lock. | |
| 1166 void collect_locked(GCCause::Cause cause); | |
| 1167 | |
| 1168 // This interface assumes that it's being called by the | |
| 1169 // vm thread. It collects the heap assuming that the | |
| 1170 // heap lock is already held and that we are executing in | |
| 1171 // the context of the vm thread. | |
| 1172 virtual void collect_as_vm_thread(GCCause::Cause cause); | |
| 1173 | |
| 1174 // True iff a evacuation has failed in the most-recent collection. | |
| 1175 bool evacuation_failed() { return _evacuation_failed; } | |
| 1176 | |
| 2152 | 1177 // It will free a region if it has allocated objects in it that are |
| 1178 // all dead. It calls either free_region() or | |
| 1179 // free_humongous_region() depending on the type of the region that | |
| 1180 // is passed to it. | |
| 2173 | 1181 void free_region_if_empty(HeapRegion* hr, |
| 1182 size_t* pre_used, | |
| 1183 FreeRegionList* free_list, | |
| 4072 | 1184 OldRegionSet* old_proxy_set, |
| 2173 | 1185 HumongousRegionSet* humongous_proxy_set, |
| 1186 HRRSCleanupTask* hrrs_cleanup_task, | |
| 1187 bool par); | |
| 342 | 1188 |
| 2152 | 1189 // It appends the free list to the master free list and updates the |
| 1190 // master humongous list according to the contents of the proxy | |
| 1191 // list. It also adjusts the total used bytes according to pre_used | |
| 1192 // (if par is true, it will do so by taking the ParGCRareEvent_lock). | |
| 1193 void update_sets_after_freeing_regions(size_t pre_used, | |
| 1194 FreeRegionList* free_list, | |
| 4072 | 1195 OldRegionSet* old_proxy_set, |
| 2152 | 1196 HumongousRegionSet* humongous_proxy_set, |
| 1197 bool par); | |
| 342 | 1198 |
| 4708 | 1199 // Returns "TRUE" iff "p" points into the committed areas of the heap. |
| 342 | 1200 virtual bool is_in(const void* p) const; |
| 1201 | |
| 1202 // Return "TRUE" iff the given object address is within the collection | |
| 1203 // set. | |
| 1204 inline bool obj_in_cs(oop obj); | |
| 1205 | |
| 1206 // Return "TRUE" iff the given object address is in the reserved | |
| 1207 // region of g1 (excluding the permanent generation). | |
| 1208 bool is_in_g1_reserved(const void* p) const { | |
| 1209 return _g1_reserved.contains(p); | |
| 1210 } | |
| 1211 | |
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1212 // Returns a MemRegion that corresponds to the space that has been |
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1213 // reserved for the heap |
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1214 MemRegion g1_reserved() { |
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1215 return _g1_reserved; |
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1216 } |
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1217 |
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1218 // Returns a MemRegion that corresponds to the space that has been |
| 342 | 1219 // committed in the heap |
| 1220 MemRegion g1_committed() { | |
| 1221 return _g1_committed; | |
| 1222 } | |
| 1223 | |
| 2311 | 1224 virtual bool is_in_closed_subset(const void* p) const; |
| 342 | 1225 |
| 1226 // This resets the card table to all zeros. It is used after | |
| 1227 // a collection pause which used the card table to claim cards. | |
| 1228 void cleanUpCardTable(); | |
| 1229 | |
| 1230 // Iteration functions. | |
| 1231 | |
| 1232 // Iterate over all the ref-containing fields of all objects, calling | |
| 1233 // "cl.do_oop" on each. | |
| 678 | 1234 virtual void oop_iterate(OopClosure* cl) { |
| 1235 oop_iterate(cl, true); | |
| 1236 } | |
| 1237 void oop_iterate(OopClosure* cl, bool do_perm); | |
| 342 | 1238 |
| 1239 // Same as above, restricted to a memory region. | |
| 678 | 1240 virtual void oop_iterate(MemRegion mr, OopClosure* cl) { |
| 1241 oop_iterate(mr, cl, true); | |
| 1242 } | |
| 1243 void oop_iterate(MemRegion mr, OopClosure* cl, bool do_perm); | |
| 342 | 1244 |
| 1245 // Iterate over all objects, calling "cl.do_object" on each. | |
| 678 | 1246 virtual void object_iterate(ObjectClosure* cl) { |
| 1247 object_iterate(cl, true); | |
| 1248 } | |
| 1249 virtual void safe_object_iterate(ObjectClosure* cl) { | |
| 1250 object_iterate(cl, true); | |
| 1251 } | |
| 1252 void object_iterate(ObjectClosure* cl, bool do_perm); | |
| 342 | 1253 |
| 1254 // Iterate over all objects allocated since the last collection, calling | |
| 1255 // "cl.do_object" on each. The heap must have been initialized properly | |
| 1256 // to support this function, or else this call will fail. | |
| 1257 virtual void object_iterate_since_last_GC(ObjectClosure* cl); | |
| 1258 | |
| 1259 // Iterate over all spaces in use in the heap, in ascending address order. | |
| 1260 virtual void space_iterate(SpaceClosure* cl); | |
| 1261 | |
| 1262 // Iterate over heap regions, in address order, terminating the | |
| 1263 // iteration early if the "doHeapRegion" method returns "true". | |
| 3766 | 1264 void heap_region_iterate(HeapRegionClosure* blk) const; |
| 342 | 1265 |
| 1266 // Iterate over heap regions starting with r (or the first region if "r" | |
| 1267 // is NULL), in address order, terminating early if the "doHeapRegion" | |
| 1268 // method returns "true". | |
| 3766 | 1269 void heap_region_iterate_from(HeapRegion* r, HeapRegionClosure* blk) const; |
| 342 | 1270 |
| 3766 | 1271 // Return the region with the given index. It assumes the index is valid. |
| 1272 HeapRegion* region_at(size_t index) const { return _hrs.at(index); } | |
| 342 | 1273 |
| 1274 // Divide the heap region sequence into "chunks" of some size (the number | |
| 1275 // of regions divided by the number of parallel threads times some | |
| 1276 // overpartition factor, currently 4). Assumes that this will be called | |
| 1277 // in parallel by ParallelGCThreads worker threads with discinct worker | |
| 1278 // ids in the range [0..max(ParallelGCThreads-1, 1)], that all parallel | |
| 1279 // calls will use the same "claim_value", and that that claim value is | |
| 1280 // different from the claim_value of any heap region before the start of | |
| 1281 // the iteration. Applies "blk->doHeapRegion" to each of the regions, by | |
| 1282 // attempting to claim the first region in each chunk, and, if | |
| 1283 // successful, applying the closure to each region in the chunk (and | |
| 1284 // setting the claim value of the second and subsequent regions of the | |
| 1285 // chunk.) For now requires that "doHeapRegion" always returns "false", | |
| 1286 // i.e., that a closure never attempt to abort a traversal. | |
| 1287 void heap_region_par_iterate_chunked(HeapRegionClosure* blk, | |
| 1288 int worker, | |
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1289 int no_of_par_workers, |
| 342 | 1290 jint claim_value); |
| 1291 | |
| 390 | 1292 // It resets all the region claim values to the default. |
| 1293 void reset_heap_region_claim_values(); | |
| 1294 | |
| 355 | 1295 #ifdef ASSERT |
| 1296 bool check_heap_region_claim_values(jint claim_value); | |
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1297 |
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1298 // Same as the routine above but only checks regions in the |
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1299 // current collection set. |
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1300 bool check_cset_heap_region_claim_values(jint claim_value); |
| 355 | 1301 #endif // ASSERT |
| 1302 | |
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1303 // Given the id of a worker, calculate a suitable |
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1304 // starting region for iterating over the current |
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1305 // collection set. |
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1306 HeapRegion* start_cset_region_for_worker(int worker_i); |
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1307 |
| 342 | 1308 // Iterate over the regions (if any) in the current collection set. |
| 1309 void collection_set_iterate(HeapRegionClosure* blk); | |
| 1310 | |
| 1311 // As above but starting from region r | |
| 1312 void collection_set_iterate_from(HeapRegion* r, HeapRegionClosure *blk); | |
| 1313 | |
| 1314 // Returns the first (lowest address) compactible space in the heap. | |
| 1315 virtual CompactibleSpace* first_compactible_space(); | |
| 1316 | |
| 1317 // A CollectedHeap will contain some number of spaces. This finds the | |
| 1318 // space containing a given address, or else returns NULL. | |
| 1319 virtual Space* space_containing(const void* addr) const; | |
| 1320 | |
| 1321 // A G1CollectedHeap will contain some number of heap regions. This | |
| 1322 // finds the region containing a given address, or else returns NULL. | |
| 3766 | 1323 template <class T> |
| 1324 inline HeapRegion* heap_region_containing(const T addr) const; | |
| 342 | 1325 |
| 1326 // Like the above, but requires "addr" to be in the heap (to avoid a | |
| 1327 // null-check), and unlike the above, may return an continuing humongous | |
| 1328 // region. | |
| 3766 | 1329 template <class T> |
| 1330 inline HeapRegion* heap_region_containing_raw(const T addr) const; | |
| 342 | 1331 |
| 1332 // A CollectedHeap is divided into a dense sequence of "blocks"; that is, | |
| 1333 // each address in the (reserved) heap is a member of exactly | |
| 1334 // one block. The defining characteristic of a block is that it is | |
| 1335 // possible to find its size, and thus to progress forward to the next | |
| 1336 // block. (Blocks may be of different sizes.) Thus, blocks may | |
| 1337 // represent Java objects, or they might be free blocks in a | |
| 1338 // free-list-based heap (or subheap), as long as the two kinds are | |
| 1339 // distinguishable and the size of each is determinable. | |
| 1340 | |
| 1341 // Returns the address of the start of the "block" that contains the | |
| 1342 // address "addr". We say "blocks" instead of "object" since some heaps | |
| 1343 // may not pack objects densely; a chunk may either be an object or a | |
| 1344 // non-object. | |
| 1345 virtual HeapWord* block_start(const void* addr) const; | |
| 1346 | |
| 1347 // Requires "addr" to be the start of a chunk, and returns its size. | |
| 1348 // "addr + size" is required to be the start of a new chunk, or the end | |
| 1349 // of the active area of the heap. | |
| 1350 virtual size_t block_size(const HeapWord* addr) const; | |
| 1351 | |
| 1352 // Requires "addr" to be the start of a block, and returns "TRUE" iff | |
| 1353 // the block is an object. | |
| 1354 virtual bool block_is_obj(const HeapWord* addr) const; | |
| 1355 | |
| 1356 // Does this heap support heap inspection? (+PrintClassHistogram) | |
| 1357 virtual bool supports_heap_inspection() const { return true; } | |
| 1358 | |
| 1359 // Section on thread-local allocation buffers (TLABs) | |
| 1360 // See CollectedHeap for semantics. | |
| 1361 | |
| 1362 virtual bool supports_tlab_allocation() const; | |
| 1363 virtual size_t tlab_capacity(Thread* thr) const; | |
| 1364 virtual size_t unsafe_max_tlab_alloc(Thread* thr) const; | |
| 1365 | |
| 1366 // Can a compiler initialize a new object without store barriers? | |
| 1367 // This permission only extends from the creation of a new object | |
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1368 // via a TLAB up to the first subsequent safepoint. If such permission |
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1369 // is granted for this heap type, the compiler promises to call |
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1370 // defer_store_barrier() below on any slow path allocation of |
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1371 // a new object for which such initializing store barriers will |
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1372 // have been elided. G1, like CMS, allows this, but should be |
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1373 // ready to provide a compensating write barrier as necessary |
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1374 // if that storage came out of a non-young region. The efficiency |
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1375 // of this implementation depends crucially on being able to |
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1376 // answer very efficiently in constant time whether a piece of |
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1377 // storage in the heap comes from a young region or not. |
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1378 // See ReduceInitialCardMarks. |
| 342 | 1379 virtual bool can_elide_tlab_store_barriers() const { |
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1380 return true; |
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1381 } |
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1382 |
| 1166 | 1383 virtual bool card_mark_must_follow_store() const { |
| 1384 return true; | |
| 1385 } | |
| 1386 | |
| 3766 | 1387 bool is_in_young(const oop obj) { |
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1388 HeapRegion* hr = heap_region_containing(obj); |
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1389 return hr != NULL && hr->is_young(); |
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1390 } |
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1391 |
|
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1392 #ifdef ASSERT |
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1393 virtual bool is_in_partial_collection(const void* p); |
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1394 #endif |
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1395 |
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1396 virtual bool is_scavengable(const void* addr); |
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1397 |
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1398 // We don't need barriers for initializing stores to objects |
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1399 // in the young gen: for the SATB pre-barrier, there is no |
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1400 // pre-value that needs to be remembered; for the remembered-set |
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1401 // update logging post-barrier, we don't maintain remembered set |
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1402 // information for young gen objects. |
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1403 virtual bool can_elide_initializing_store_barrier(oop new_obj) { |
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1404 return is_in_young(new_obj); |
| 342 | 1405 } |
| 1406 | |
| 1407 // Can a compiler elide a store barrier when it writes | |
| 1408 // a permanent oop into the heap? Applies when the compiler | |
| 1409 // is storing x to the heap, where x->is_perm() is true. | |
| 1410 virtual bool can_elide_permanent_oop_store_barriers() const { | |
| 1411 // At least until perm gen collection is also G1-ified, at | |
| 1412 // which point this should return false. | |
| 1413 return true; | |
| 1414 } | |
| 1415 | |
| 1416 // Returns "true" iff the given word_size is "very large". | |
| 1417 static bool isHumongous(size_t word_size) { | |
|
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1418 // Note this has to be strictly greater-than as the TLABs |
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1419 // are capped at the humongous thresold and we want to |
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1420 // ensure that we don't try to allocate a TLAB as |
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1421 // humongous and that we don't allocate a humongous |
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1422 // object in a TLAB. |
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1423 return word_size > _humongous_object_threshold_in_words; |
| 342 | 1424 } |
| 1425 | |
| 1426 // Update mod union table with the set of dirty cards. | |
| 1427 void updateModUnion(); | |
| 1428 | |
| 1429 // Set the mod union bits corresponding to the given memRegion. Note | |
| 1430 // that this is always a safe operation, since it doesn't clear any | |
| 1431 // bits. | |
| 1432 void markModUnionRange(MemRegion mr); | |
| 1433 | |
| 1434 // Records the fact that a marking phase is no longer in progress. | |
| 1435 void set_marking_complete() { | |
| 1436 _mark_in_progress = false; | |
| 1437 } | |
| 1438 void set_marking_started() { | |
| 1439 _mark_in_progress = true; | |
| 1440 } | |
| 1441 bool mark_in_progress() { | |
| 1442 return _mark_in_progress; | |
| 1443 } | |
| 1444 | |
| 1445 // Print the maximum heap capacity. | |
| 1446 virtual size_t max_capacity() const; | |
| 1447 | |
| 1448 virtual jlong millis_since_last_gc(); | |
| 1449 | |
| 1450 // Perform any cleanup actions necessary before allowing a verification. | |
| 1451 virtual void prepare_for_verify(); | |
| 1452 | |
| 1453 // Perform verification. | |
| 811 | 1454 |
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1455 // vo == UsePrevMarking -> use "prev" marking information, |
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1456 // vo == UseNextMarking -> use "next" marking information |
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1457 // vo == UseMarkWord -> use the mark word in the object header |
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1458 // |
| 811 | 1459 // NOTE: Only the "prev" marking information is guaranteed to be |
| 1460 // consistent most of the time, so most calls to this should use | |
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1461 // vo == UsePrevMarking. |
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1462 // Currently, there is only one case where this is called with |
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1463 // vo == UseNextMarking, which is to verify the "next" marking |
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1464 // information at the end of remark. |
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1465 // Currently there is only one place where this is called with |
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1466 // vo == UseMarkWord, which is to verify the marking during a |
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1467 // full GC. |
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1468 void verify(bool allow_dirty, bool silent, VerifyOption vo); |
| 811 | 1469 |
| 1470 // Override; it uses the "prev" marking information | |
| 342 | 1471 virtual void verify(bool allow_dirty, bool silent); |
| 1472 virtual void print_on(outputStream* st) const; | |
|
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1473 virtual void print_extended_on(outputStream* st) const; |
| 342 | 1474 |
| 1475 virtual void print_gc_threads_on(outputStream* st) const; | |
| 1476 virtual void gc_threads_do(ThreadClosure* tc) const; | |
| 1477 | |
| 1478 // Override | |
| 1479 void print_tracing_info() const; | |
| 1480 | |
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1481 // The following two methods are helpful for debugging RSet issues. |
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1482 void print_cset_rsets() PRODUCT_RETURN; |
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1483 void print_all_rsets() PRODUCT_RETURN; |
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1484 |
| 342 | 1485 // Convenience function to be used in situations where the heap type can be |
| 1486 // asserted to be this type. | |
| 1487 static G1CollectedHeap* heap(); | |
| 1488 | |
| 1489 void set_region_short_lived_locked(HeapRegion* hr); | |
| 1490 // add appropriate methods for any other surv rate groups | |
| 1491 | |
|
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|
1492 YoungList* young_list() { return _young_list; } |
| 342 | 1493 |
| 1494 // debugging | |
| 1495 bool check_young_list_well_formed() { | |
| 1496 return _young_list->check_list_well_formed(); | |
| 1497 } | |
|
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1498 |
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1499 bool check_young_list_empty(bool check_heap, |
| 342 | 1500 bool check_sample = true); |
| 1501 | |
| 1502 // *** Stuff related to concurrent marking. It's not clear to me that so | |
| 1503 // many of these need to be public. | |
| 1504 | |
| 1505 // The functions below are helper functions that a subclass of | |
| 1506 // "CollectedHeap" can use in the implementation of its virtual | |
| 1507 // functions. | |
| 1508 // This performs a concurrent marking of the live objects in a | |
| 1509 // bitmap off to the side. | |
| 1510 void doConcurrentMark(); | |
| 1511 | |
| 1512 bool isMarkedPrev(oop obj) const; | |
| 1513 bool isMarkedNext(oop obj) const; | |
| 1514 | |
|
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1515 // vo == UsePrevMarking -> use "prev" marking information, |
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1516 // vo == UseNextMarking -> use "next" marking information, |
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1517 // vo == UseMarkWord -> use mark word from object header |
| 811 | 1518 bool is_obj_dead_cond(const oop obj, |
| 1519 const HeapRegion* hr, | |
|
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1520 const VerifyOption vo) const { |
|
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1521 |
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1522 switch (vo) { |
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1523 case VerifyOption_G1UsePrevMarking: |
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1524 return is_obj_dead(obj, hr); |
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1525 case VerifyOption_G1UseNextMarking: |
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1526 return is_obj_ill(obj, hr); |
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1527 default: |
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1528 assert(vo == VerifyOption_G1UseMarkWord, "must be"); |
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1529 return !obj->is_gc_marked(); |
| 811 | 1530 } |
| 1531 } | |
| 1532 | |
| 342 | 1533 // Determine if an object is dead, given the object and also |
| 1534 // the region to which the object belongs. An object is dead | |
| 1535 // iff a) it was not allocated since the last mark and b) it | |
| 1536 // is not marked. | |
| 1537 | |
| 1538 bool is_obj_dead(const oop obj, const HeapRegion* hr) const { | |
| 1539 return | |
| 1540 !hr->obj_allocated_since_prev_marking(obj) && | |
| 1541 !isMarkedPrev(obj); | |
| 1542 } | |
| 1543 | |
| 1544 // This is used when copying an object to survivor space. | |
| 1545 // If the object is marked live, then we mark the copy live. | |
| 1546 // If the object is allocated since the start of this mark | |
| 1547 // cycle, then we mark the copy live. | |
| 1548 // If the object has been around since the previous mark | |
| 1549 // phase, and hasn't been marked yet during this phase, | |
| 1550 // then we don't mark it, we just wait for the | |
| 1551 // current marking cycle to get to it. | |
| 1552 | |
| 1553 // This function returns true when an object has been | |
| 1554 // around since the previous marking and hasn't yet | |
| 1555 // been marked during this marking. | |
| 1556 | |
| 1557 bool is_obj_ill(const oop obj, const HeapRegion* hr) const { | |
| 1558 return | |
| 1559 !hr->obj_allocated_since_next_marking(obj) && | |
| 1560 !isMarkedNext(obj); | |
| 1561 } | |
| 1562 | |
| 1563 // Determine if an object is dead, given only the object itself. | |
| 1564 // This will find the region to which the object belongs and | |
| 1565 // then call the region version of the same function. | |
| 1566 | |
| 1567 // Added if it is in permanent gen it isn't dead. | |
| 1568 // Added if it is NULL it isn't dead. | |
| 1569 | |
|
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1570 // vo == UsePrevMarking -> use "prev" marking information, |
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1571 // vo == UseNextMarking -> use "next" marking information, |
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1572 // vo == UseMarkWord -> use mark word from object header |
| 811 | 1573 bool is_obj_dead_cond(const oop obj, |
|
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|
1574 const VerifyOption vo) const { |
|
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|
1575 |
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|
1576 switch (vo) { |
|
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|
1577 case VerifyOption_G1UsePrevMarking: |
|
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1578 return is_obj_dead(obj); |
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1579 case VerifyOption_G1UseNextMarking: |
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1580 return is_obj_ill(obj); |
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1581 default: |
|
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1582 assert(vo == VerifyOption_G1UseMarkWord, "must be"); |
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1583 return !obj->is_gc_marked(); |
| 811 | 1584 } |
| 1585 } | |
| 1586 | |
|
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1587 bool is_obj_dead(const oop obj) const { |
| 811 | 1588 const HeapRegion* hr = heap_region_containing(obj); |
| 342 | 1589 if (hr == NULL) { |
| 1590 if (Universe::heap()->is_in_permanent(obj)) | |
| 1591 return false; | |
| 1592 else if (obj == NULL) return false; | |
| 1593 else return true; | |
| 1594 } | |
| 1595 else return is_obj_dead(obj, hr); | |
| 1596 } | |
| 1597 | |
|
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1598 bool is_obj_ill(const oop obj) const { |
| 811 | 1599 const HeapRegion* hr = heap_region_containing(obj); |
| 342 | 1600 if (hr == NULL) { |
| 1601 if (Universe::heap()->is_in_permanent(obj)) | |
| 1602 return false; | |
| 1603 else if (obj == NULL) return false; | |
| 1604 else return true; | |
| 1605 } | |
| 1606 else return is_obj_ill(obj, hr); | |
| 1607 } | |
| 1608 | |
| 1609 // The following is just to alert the verification code | |
| 1610 // that a full collection has occurred and that the | |
| 1611 // remembered sets are no longer up to date. | |
| 1612 bool _full_collection; | |
| 1613 void set_full_collection() { _full_collection = true;} | |
| 1614 void clear_full_collection() {_full_collection = false;} | |
| 1615 bool full_collection() {return _full_collection;} | |
| 1616 | |
| 1617 ConcurrentMark* concurrent_mark() const { return _cm; } | |
| 1618 ConcurrentG1Refine* concurrent_g1_refine() const { return _cg1r; } | |
| 1619 | |
|
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1620 // The dirty cards region list is used to record a subset of regions |
|
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1621 // whose cards need clearing. The list if populated during the |
|
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1622 // remembered set scanning and drained during the card table |
|
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1623 // cleanup. Although the methods are reentrant, population/draining |
|
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1624 // phases must not overlap. For synchronization purposes the last |
|
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1625 // element on the list points to itself. |
|
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1626 HeapRegion* _dirty_cards_region_list; |
|
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1627 void push_dirty_cards_region(HeapRegion* hr); |
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1628 HeapRegion* pop_dirty_cards_region(); |
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1629 |
| 342 | 1630 public: |
| 1631 void stop_conc_gc_threads(); | |
| 1632 | |
| 1633 double predict_region_elapsed_time_ms(HeapRegion* hr, bool young); | |
| 1634 void check_if_region_is_too_expensive(double predicted_time_ms); | |
| 1635 size_t pending_card_num(); | |
| 1636 size_t max_pending_card_num(); | |
| 1637 size_t cards_scanned(); | |
| 1638 | |
| 1639 protected: | |
| 1640 size_t _max_heap_capacity; | |
| 1641 }; | |
| 1642 | |
|
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1643 #define use_local_bitmaps 1 |
|
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1644 #define verify_local_bitmaps 0 |
|
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1645 #define oop_buffer_length 256 |
|
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1646 |
|
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|
1647 #ifndef PRODUCT |
|
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|
1648 class GCLabBitMap; |
|
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1649 class GCLabBitMapClosure: public BitMapClosure { |
|
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|
1650 private: |
|
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|
1651 ConcurrentMark* _cm; |
|
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|
1652 GCLabBitMap* _bitmap; |
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|
1653 |
|
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|
1654 public: |
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|
1655 GCLabBitMapClosure(ConcurrentMark* cm, |
|
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|
1656 GCLabBitMap* bitmap) { |
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|
1657 _cm = cm; |
|
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|
1658 _bitmap = bitmap; |
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|
1659 } |
|
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|
1660 |
|
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|
1661 virtual bool do_bit(size_t offset); |
|
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|
1662 }; |
|
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|
1663 #endif // !PRODUCT |
|
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|
1664 |
|
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|
1665 class GCLabBitMap: public BitMap { |
|
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|
1666 private: |
|
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|
1667 ConcurrentMark* _cm; |
|
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|
1668 |
|
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|
1669 int _shifter; |
|
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|
1670 size_t _bitmap_word_covers_words; |
|
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1671 |
|
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1672 // beginning of the heap |
|
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|
1673 HeapWord* _heap_start; |
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|
1674 |
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1675 // this is the actual start of the GCLab |
|
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|
1676 HeapWord* _real_start_word; |
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1677 |
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1678 // this is the actual end of the GCLab |
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|
1679 HeapWord* _real_end_word; |
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1680 |
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1681 // this is the first word, possibly located before the actual start |
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|
1682 // of the GCLab, that corresponds to the first bit of the bitmap |
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|
1683 HeapWord* _start_word; |
|
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1684 |
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1685 // size of a GCLab in words |
|
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|
1686 size_t _gclab_word_size; |
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1687 |
|
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|
1688 static int shifter() { |
|
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|
1689 return MinObjAlignment - 1; |
|
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|
1690 } |
|
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|
1691 |
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|
1692 // how many heap words does a single bitmap word corresponds to? |
|
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|
1693 static size_t bitmap_word_covers_words() { |
|
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|
1694 return BitsPerWord << shifter(); |
|
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|
1695 } |
|
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1696 |
|
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1697 size_t gclab_word_size() const { |
|
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1698 return _gclab_word_size; |
|
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|
1699 } |
|
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1700 |
|
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changeset
|
1701 // Calculates actual GCLab size in words |
|
79e419e5ea3b
6942253: G1: replace G1ParallelGCAllocBufferSize with YoungPLABSize and OldPLABSize
apetrusenko
parents:
1313
diff
changeset
|
1702 size_t gclab_real_word_size() const { |
|
79e419e5ea3b
6942253: G1: replace G1ParallelGCAllocBufferSize with YoungPLABSize and OldPLABSize
apetrusenko
parents:
1313
diff
changeset
|
1703 return bitmap_size_in_bits(pointer_delta(_real_end_word, _start_word)) |
|
79e419e5ea3b
6942253: G1: replace G1ParallelGCAllocBufferSize with YoungPLABSize and OldPLABSize
apetrusenko
parents:
1313
diff
changeset
|
1704 / BitsPerWord; |
|
79e419e5ea3b
6942253: G1: replace G1ParallelGCAllocBufferSize with YoungPLABSize and OldPLABSize
apetrusenko
parents:
1313
diff
changeset
|
1705 } |
|
79e419e5ea3b
6942253: G1: replace G1ParallelGCAllocBufferSize with YoungPLABSize and OldPLABSize
apetrusenko
parents:
1313
diff
changeset
|
1706 |
|
79e419e5ea3b
6942253: G1: replace G1ParallelGCAllocBufferSize with YoungPLABSize and OldPLABSize
apetrusenko
parents:
1313
diff
changeset
|
1707 static size_t bitmap_size_in_bits(size_t gclab_word_size) { |
|
79e419e5ea3b
6942253: G1: replace G1ParallelGCAllocBufferSize with YoungPLABSize and OldPLABSize
apetrusenko
parents:
1313
diff
changeset
|
1708 size_t bits_in_bitmap = gclab_word_size >> shifter(); |
|
845
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
ysr
parents:
838
diff
changeset
|
1709 // We are going to ensure that the beginning of a word in this |
|
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
ysr
parents:
838
diff
changeset
|
1710 // bitmap also corresponds to the beginning of a word in the |
|
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
ysr
parents:
838
diff
changeset
|
1711 // global marking bitmap. To handle the case where a GCLab |
|
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
ysr
parents:
838
diff
changeset
|
1712 // starts from the middle of the bitmap, we need to add enough |
|
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
ysr
parents:
838
diff
changeset
|
1713 // space (i.e. up to a bitmap word) to ensure that we have |
|
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
ysr
parents:
838
diff
changeset
|
1714 // enough bits in the bitmap. |
|
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
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parents:
838
diff
changeset
|
1715 return bits_in_bitmap + BitsPerWord - 1; |
|
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
ysr
parents:
838
diff
changeset
|
1716 } |
|
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
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parents:
838
diff
changeset
|
1717 public: |
|
1391
79e419e5ea3b
6942253: G1: replace G1ParallelGCAllocBufferSize with YoungPLABSize and OldPLABSize
apetrusenko
parents:
1313
diff
changeset
|
1718 GCLabBitMap(HeapWord* heap_start, size_t gclab_word_size) |
|
79e419e5ea3b
6942253: G1: replace G1ParallelGCAllocBufferSize with YoungPLABSize and OldPLABSize
apetrusenko
parents:
1313
diff
changeset
|
1719 : BitMap(bitmap_size_in_bits(gclab_word_size)), |
|
845
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
ysr
parents:
838
diff
changeset
|
1720 _cm(G1CollectedHeap::heap()->concurrent_mark()), |
|
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
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parents:
838
diff
changeset
|
1721 _shifter(shifter()), |
|
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
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parents:
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diff
changeset
|
1722 _bitmap_word_covers_words(bitmap_word_covers_words()), |
|
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
ysr
parents:
838
diff
changeset
|
1723 _heap_start(heap_start), |
|
1391
79e419e5ea3b
6942253: G1: replace G1ParallelGCAllocBufferSize with YoungPLABSize and OldPLABSize
apetrusenko
parents:
1313
diff
changeset
|
1724 _gclab_word_size(gclab_word_size), |
|
845
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
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parents:
838
diff
changeset
|
1725 _real_start_word(NULL), |
|
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
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parents:
838
diff
changeset
|
1726 _real_end_word(NULL), |
|
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
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parents:
838
diff
changeset
|
1727 _start_word(NULL) |
|
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
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parents:
838
diff
changeset
|
1728 { |
|
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
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parents:
838
diff
changeset
|
1729 guarantee( size_in_words() >= bitmap_size_in_words(), |
|
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
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parents:
838
diff
changeset
|
1730 "just making sure"); |
|
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
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parents:
838
diff
changeset
|
1731 } |
|
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
ysr
parents:
838
diff
changeset
|
1732 |
|
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
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parents:
838
diff
changeset
|
1733 inline unsigned heapWordToOffset(HeapWord* addr) { |
|
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
ysr
parents:
838
diff
changeset
|
1734 unsigned offset = (unsigned) pointer_delta(addr, _start_word) >> _shifter; |
|
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
ysr
parents:
838
diff
changeset
|
1735 assert(offset < size(), "offset should be within bounds"); |
|
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
ysr
parents:
838
diff
changeset
|
1736 return offset; |
|
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
ysr
parents:
838
diff
changeset
|
1737 } |
|
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
ysr
parents:
838
diff
changeset
|
1738 |
|
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
ysr
parents:
838
diff
changeset
|
1739 inline HeapWord* offsetToHeapWord(size_t offset) { |
|
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
ysr
parents:
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diff
changeset
|
1740 HeapWord* addr = _start_word + (offset << _shifter); |
|
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
ysr
parents:
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diff
changeset
|
1741 assert(_real_start_word <= addr && addr < _real_end_word, "invariant"); |
|
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
ysr
parents:
838
diff
changeset
|
1742 return addr; |
|
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
ysr
parents:
838
diff
changeset
|
1743 } |
|
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
ysr
parents:
838
diff
changeset
|
1744 |
|
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
ysr
parents:
838
diff
changeset
|
1745 bool fields_well_formed() { |
|
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
ysr
parents:
838
diff
changeset
|
1746 bool ret1 = (_real_start_word == NULL) && |
|
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
ysr
parents:
838
diff
changeset
|
1747 (_real_end_word == NULL) && |
|
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
ysr
parents:
838
diff
changeset
|
1748 (_start_word == NULL); |
|
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
ysr
parents:
838
diff
changeset
|
1749 if (ret1) |
|
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
ysr
parents:
838
diff
changeset
|
1750 return true; |
|
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
ysr
parents:
838
diff
changeset
|
1751 |
|
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
ysr
parents:
838
diff
changeset
|
1752 bool ret2 = _real_start_word >= _start_word && |
|
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
ysr
parents:
838
diff
changeset
|
1753 _start_word < _real_end_word && |
|
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
ysr
parents:
838
diff
changeset
|
1754 (_real_start_word + _gclab_word_size) == _real_end_word && |
|
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
ysr
parents:
838
diff
changeset
|
1755 (_start_word + _gclab_word_size + _bitmap_word_covers_words) |
|
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
ysr
parents:
838
diff
changeset
|
1756 > _real_end_word; |
|
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
ysr
parents:
838
diff
changeset
|
1757 return ret2; |
|
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
ysr
parents:
838
diff
changeset
|
1758 } |
|
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
ysr
parents:
838
diff
changeset
|
1759 |
|
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
ysr
parents:
838
diff
changeset
|
1760 inline bool mark(HeapWord* addr) { |
|
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
ysr
parents:
838
diff
changeset
|
1761 guarantee(use_local_bitmaps, "invariant"); |
|
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
ysr
parents:
838
diff
changeset
|
1762 assert(fields_well_formed(), "invariant"); |
|
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
ysr
parents:
838
diff
changeset
|
1763 |
|
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
ysr
parents:
838
diff
changeset
|
1764 if (addr >= _real_start_word && addr < _real_end_word) { |
|
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
ysr
parents:
838
diff
changeset
|
1765 assert(!isMarked(addr), "should not have already been marked"); |
|
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
ysr
parents:
838
diff
changeset
|
1766 |
|
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
ysr
parents:
838
diff
changeset
|
1767 // first mark it on the bitmap |
|
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
ysr
parents:
838
diff
changeset
|
1768 at_put(heapWordToOffset(addr), true); |
|
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
ysr
parents:
838
diff
changeset
|
1769 |
|
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
ysr
parents:
838
diff
changeset
|
1770 return true; |
|
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
ysr
parents:
838
diff
changeset
|
1771 } else { |
|
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
ysr
parents:
838
diff
changeset
|
1772 return false; |
|
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
ysr
parents:
838
diff
changeset
|
1773 } |
|
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
ysr
parents:
838
diff
changeset
|
1774 } |
|
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
ysr
parents:
838
diff
changeset
|
1775 |
|
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
ysr
parents:
838
diff
changeset
|
1776 inline bool isMarked(HeapWord* addr) { |
|
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
ysr
parents:
838
diff
changeset
|
1777 guarantee(use_local_bitmaps, "invariant"); |
|
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
ysr
parents:
838
diff
changeset
|
1778 assert(fields_well_formed(), "invariant"); |
|
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
ysr
parents:
838
diff
changeset
|
1779 |
|
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
ysr
parents:
838
diff
changeset
|
1780 return at(heapWordToOffset(addr)); |
|
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
ysr
parents:
838
diff
changeset
|
1781 } |
|
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
ysr
parents:
838
diff
changeset
|
1782 |
|
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
ysr
parents:
838
diff
changeset
|
1783 void set_buffer(HeapWord* start) { |
|
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
ysr
parents:
838
diff
changeset
|
1784 guarantee(use_local_bitmaps, "invariant"); |
|
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
ysr
parents:
838
diff
changeset
|
1785 clear(); |
|
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
ysr
parents:
838
diff
changeset
|
1786 |
|
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
ysr
parents:
838
diff
changeset
|
1787 assert(start != NULL, "invariant"); |
|
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
ysr
parents:
838
diff
changeset
|
1788 _real_start_word = start; |
|
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
ysr
parents:
838
diff
changeset
|
1789 _real_end_word = start + _gclab_word_size; |
|
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
ysr
parents:
838
diff
changeset
|
1790 |
|
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
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parents:
838
diff
changeset
|
1791 size_t diff = |
|
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
ysr
parents:
838
diff
changeset
|
1792 pointer_delta(start, _heap_start) % _bitmap_word_covers_words; |
|
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
ysr
parents:
838
diff
changeset
|
1793 _start_word = start - diff; |
|
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
ysr
parents:
838
diff
changeset
|
1794 |
|
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
ysr
parents:
838
diff
changeset
|
1795 assert(fields_well_formed(), "invariant"); |
|
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
ysr
parents:
838
diff
changeset
|
1796 } |
|
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
ysr
parents:
838
diff
changeset
|
1797 |
|
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
ysr
parents:
838
diff
changeset
|
1798 #ifndef PRODUCT |
|
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
ysr
parents:
838
diff
changeset
|
1799 void verify() { |
|
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
ysr
parents:
838
diff
changeset
|
1800 // verify that the marks have been propagated |
|
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
ysr
parents:
838
diff
changeset
|
1801 GCLabBitMapClosure cl(_cm, this); |
|
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
ysr
parents:
838
diff
changeset
|
1802 iterate(&cl); |
|
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
ysr
parents:
838
diff
changeset
|
1803 } |
|
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
ysr
parents:
838
diff
changeset
|
1804 #endif // PRODUCT |
|
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
ysr
parents:
838
diff
changeset
|
1805 |
|
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
ysr
parents:
838
diff
changeset
|
1806 void retire() { |
|
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
ysr
parents:
838
diff
changeset
|
1807 guarantee(use_local_bitmaps, "invariant"); |
|
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
ysr
parents:
838
diff
changeset
|
1808 assert(fields_well_formed(), "invariant"); |
|
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
ysr
parents:
838
diff
changeset
|
1809 |
|
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
ysr
parents:
838
diff
changeset
|
1810 if (_start_word != NULL) { |
|
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
ysr
parents:
838
diff
changeset
|
1811 CMBitMap* mark_bitmap = _cm->nextMarkBitMap(); |
|
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
ysr
parents:
838
diff
changeset
|
1812 |
|
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
ysr
parents:
838
diff
changeset
|
1813 // this means that the bitmap was set up for the GCLab |
|
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
ysr
parents:
838
diff
changeset
|
1814 assert(_real_start_word != NULL && _real_end_word != NULL, "invariant"); |
|
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
ysr
parents:
838
diff
changeset
|
1815 |
|
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
ysr
parents:
838
diff
changeset
|
1816 mark_bitmap->mostly_disjoint_range_union(this, |
|
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
ysr
parents:
838
diff
changeset
|
1817 0, // always start from the start of the bitmap |
|
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
ysr
parents:
838
diff
changeset
|
1818 _start_word, |
|
1391
79e419e5ea3b
6942253: G1: replace G1ParallelGCAllocBufferSize with YoungPLABSize and OldPLABSize
apetrusenko
parents:
1313
diff
changeset
|
1819 gclab_real_word_size()); |
|
845
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
ysr
parents:
838
diff
changeset
|
1820 _cm->grayRegionIfNecessary(MemRegion(_real_start_word, _real_end_word)); |
|
df6caf649ff7
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1821 |
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1822 #ifndef PRODUCT |
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1823 if (use_local_bitmaps && verify_local_bitmaps) |
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1824 verify(); |
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1825 #endif // PRODUCT |
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1826 } else { |
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1827 assert(_real_start_word == NULL && _real_end_word == NULL, "invariant"); |
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1828 } |
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1829 } |
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1830 |
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1831 size_t bitmap_size_in_words() const { |
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1832 return (bitmap_size_in_bits(gclab_word_size()) + BitsPerWord - 1) / BitsPerWord; |
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1833 } |
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1834 |
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1835 }; |
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1836 |
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1837 class G1ParGCAllocBuffer: public ParGCAllocBuffer { |
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1838 private: |
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1839 bool _retired; |
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1840 bool _should_mark_objects; |
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1841 GCLabBitMap _bitmap; |
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1842 |
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1843 public: |
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1844 G1ParGCAllocBuffer(size_t gclab_word_size); |
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1845 |
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1846 inline bool mark(HeapWord* addr) { |
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1847 guarantee(use_local_bitmaps, "invariant"); |
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1848 assert(_should_mark_objects, "invariant"); |
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1849 return _bitmap.mark(addr); |
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1850 } |
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1851 |
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1852 inline void set_buf(HeapWord* buf) { |
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1853 if (use_local_bitmaps && _should_mark_objects) { |
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1854 _bitmap.set_buffer(buf); |
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1855 } |
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1856 ParGCAllocBuffer::set_buf(buf); |
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1857 _retired = false; |
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1858 } |
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1859 |
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1860 inline void retire(bool end_of_gc, bool retain) { |
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1861 if (_retired) |
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1862 return; |
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1863 if (use_local_bitmaps && _should_mark_objects) { |
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1864 _bitmap.retire(); |
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1865 } |
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1866 ParGCAllocBuffer::retire(end_of_gc, retain); |
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1867 _retired = true; |
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1868 } |
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1869 }; |
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1870 |
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1871 class G1ParScanThreadState : public StackObj { |
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1872 protected: |
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1873 G1CollectedHeap* _g1h; |
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1874 RefToScanQueue* _refs; |
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1875 DirtyCardQueue _dcq; |
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1876 CardTableModRefBS* _ct_bs; |
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1877 G1RemSet* _g1_rem; |
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1878 |
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1879 G1ParGCAllocBuffer _surviving_alloc_buffer; |
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1880 G1ParGCAllocBuffer _tenured_alloc_buffer; |
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1881 G1ParGCAllocBuffer* _alloc_buffers[GCAllocPurposeCount]; |
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1882 ageTable _age_table; |
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1883 |
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1884 size_t _alloc_buffer_waste; |
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1885 size_t _undo_waste; |
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1886 |
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1887 OopsInHeapRegionClosure* _evac_failure_cl; |
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1888 G1ParScanHeapEvacClosure* _evac_cl; |
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1889 G1ParScanPartialArrayClosure* _partial_scan_cl; |
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1890 |
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1891 int _hash_seed; |
|
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1892 int _queue_num; |
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1893 |
| 1611 | 1894 size_t _term_attempts; |
|
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1895 |
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1896 double _start; |
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1897 double _start_strong_roots; |
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1898 double _strong_roots_time; |
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1899 double _start_term; |
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1900 double _term_time; |
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1901 |
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1902 // Map from young-age-index (0 == not young, 1 is youngest) to |
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1903 // surviving words. base is what we get back from the malloc call |
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1904 size_t* _surviving_young_words_base; |
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1905 // this points into the array, as we use the first few entries for padding |
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1906 size_t* _surviving_young_words; |
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1907 |
| 1709 | 1908 #define PADDING_ELEM_NUM (DEFAULT_CACHE_LINE_SIZE / sizeof(size_t)) |
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1909 |
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1910 void add_to_alloc_buffer_waste(size_t waste) { _alloc_buffer_waste += waste; } |
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1911 |
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1912 void add_to_undo_waste(size_t waste) { _undo_waste += waste; } |
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1913 |
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1914 DirtyCardQueue& dirty_card_queue() { return _dcq; } |
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1915 CardTableModRefBS* ctbs() { return _ct_bs; } |
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1916 |
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1917 template <class T> void immediate_rs_update(HeapRegion* from, T* p, int tid) { |
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1918 if (!from->is_survivor()) { |
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1919 _g1_rem->par_write_ref(from, p, tid); |
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1920 } |
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1921 } |
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1922 |
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1923 template <class T> void deferred_rs_update(HeapRegion* from, T* p, int tid) { |
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1924 // If the new value of the field points to the same region or |
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1925 // is the to-space, we don't need to include it in the Rset updates. |
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1926 if (!from->is_in_reserved(oopDesc::load_decode_heap_oop(p)) && !from->is_survivor()) { |
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1927 size_t card_index = ctbs()->index_for(p); |
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1928 // If the card hasn't been added to the buffer, do it. |
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1929 if (ctbs()->mark_card_deferred(card_index)) { |
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1930 dirty_card_queue().enqueue((jbyte*)ctbs()->byte_for_index(card_index)); |
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1931 } |
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1932 } |
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1933 } |
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1934 |
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1935 public: |
|
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1936 G1ParScanThreadState(G1CollectedHeap* g1h, int queue_num); |
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1937 |
|
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1938 ~G1ParScanThreadState() { |
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1939 FREE_C_HEAP_ARRAY(size_t, _surviving_young_words_base); |
|
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1940 } |
|
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1941 |
|
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1942 RefToScanQueue* refs() { return _refs; } |
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1943 ageTable* age_table() { return &_age_table; } |
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1944 |
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1945 G1ParGCAllocBuffer* alloc_buffer(GCAllocPurpose purpose) { |
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1946 return _alloc_buffers[purpose]; |
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1947 } |
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1948 |
| 1709 | 1949 size_t alloc_buffer_waste() const { return _alloc_buffer_waste; } |
| 1950 size_t undo_waste() const { return _undo_waste; } | |
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1951 |
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1952 #ifdef ASSERT |
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1953 bool verify_ref(narrowOop* ref) const; |
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1954 bool verify_ref(oop* ref) const; |
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1955 bool verify_task(StarTask ref) const; |
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1956 #endif // ASSERT |
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1957 |
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1958 template <class T> void push_on_queue(T* ref) { |
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1959 assert(verify_ref(ref), "sanity"); |
| 1709 | 1960 refs()->push(ref); |
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1961 } |
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1962 |
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1963 template <class T> void update_rs(HeapRegion* from, T* p, int tid) { |
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1964 if (G1DeferredRSUpdate) { |
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1965 deferred_rs_update(from, p, tid); |
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1966 } else { |
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1967 immediate_rs_update(from, p, tid); |
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1968 } |
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1969 } |
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1970 |
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1971 HeapWord* allocate_slow(GCAllocPurpose purpose, size_t word_sz) { |
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1972 |
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1973 HeapWord* obj = NULL; |
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1974 size_t gclab_word_size = _g1h->desired_plab_sz(purpose); |
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1975 if (word_sz * 100 < gclab_word_size * ParallelGCBufferWastePct) { |
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1976 G1ParGCAllocBuffer* alloc_buf = alloc_buffer(purpose); |
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1977 assert(gclab_word_size == alloc_buf->word_sz(), |
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1978 "dynamic resizing is not supported"); |
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1979 add_to_alloc_buffer_waste(alloc_buf->words_remaining()); |
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1980 alloc_buf->retire(false, false); |
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1981 |
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1982 HeapWord* buf = _g1h->par_allocate_during_gc(purpose, gclab_word_size); |
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1983 if (buf == NULL) return NULL; // Let caller handle allocation failure. |
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1984 // Otherwise. |
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1985 alloc_buf->set_buf(buf); |
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1986 |
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1987 obj = alloc_buf->allocate(word_sz); |
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1988 assert(obj != NULL, "buffer was definitely big enough..."); |
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1989 } else { |
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1990 obj = _g1h->par_allocate_during_gc(purpose, word_sz); |
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1991 } |
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1992 return obj; |
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1993 } |
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1994 |
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1995 HeapWord* allocate(GCAllocPurpose purpose, size_t word_sz) { |
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1996 HeapWord* obj = alloc_buffer(purpose)->allocate(word_sz); |
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1997 if (obj != NULL) return obj; |
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1998 return allocate_slow(purpose, word_sz); |
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1999 } |
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2000 |
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2001 void undo_allocation(GCAllocPurpose purpose, HeapWord* obj, size_t word_sz) { |
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2002 if (alloc_buffer(purpose)->contains(obj)) { |
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2003 assert(alloc_buffer(purpose)->contains(obj + word_sz - 1), |
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2004 "should contain whole object"); |
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2005 alloc_buffer(purpose)->undo_allocation(obj, word_sz); |
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2006 } else { |
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2007 CollectedHeap::fill_with_object(obj, word_sz); |
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2008 add_to_undo_waste(word_sz); |
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2009 } |
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2010 } |
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2011 |
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2012 void set_evac_failure_closure(OopsInHeapRegionClosure* evac_failure_cl) { |
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2013 _evac_failure_cl = evac_failure_cl; |
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2014 } |
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2015 OopsInHeapRegionClosure* evac_failure_closure() { |
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2016 return _evac_failure_cl; |
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2017 } |
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2018 |
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2019 void set_evac_closure(G1ParScanHeapEvacClosure* evac_cl) { |
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2020 _evac_cl = evac_cl; |
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2021 } |
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2022 |
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2023 void set_partial_scan_closure(G1ParScanPartialArrayClosure* partial_scan_cl) { |
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2024 _partial_scan_cl = partial_scan_cl; |
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2025 } |
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2026 |
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2027 int* hash_seed() { return &_hash_seed; } |
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2028 int queue_num() { return _queue_num; } |
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2029 |
| 1709 | 2030 size_t term_attempts() const { return _term_attempts; } |
| 1611 | 2031 void note_term_attempt() { _term_attempts++; } |
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2032 |
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2033 void start_strong_roots() { |
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2034 _start_strong_roots = os::elapsedTime(); |
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2035 } |
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2036 void end_strong_roots() { |
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2037 _strong_roots_time += (os::elapsedTime() - _start_strong_roots); |
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2038 } |
| 1709 | 2039 double strong_roots_time() const { return _strong_roots_time; } |
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2040 |
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2041 void start_term_time() { |
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2042 note_term_attempt(); |
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2043 _start_term = os::elapsedTime(); |
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2044 } |
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2045 void end_term_time() { |
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2046 _term_time += (os::elapsedTime() - _start_term); |
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2047 } |
| 1709 | 2048 double term_time() const { return _term_time; } |
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2049 |
| 1709 | 2050 double elapsed_time() const { |
|
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2051 return os::elapsedTime() - _start; |
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2052 } |
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2053 |
| 1709 | 2054 static void |
| 2055 print_termination_stats_hdr(outputStream* const st = gclog_or_tty); | |
| 2056 void | |
| 2057 print_termination_stats(int i, outputStream* const st = gclog_or_tty) const; | |
| 2058 | |
|
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2059 size_t* surviving_young_words() { |
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2060 // We add on to hide entry 0 which accumulates surviving words for |
|
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2061 // age -1 regions (i.e. non-young ones) |
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2062 return _surviving_young_words; |
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2063 } |
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2064 |
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2065 void retire_alloc_buffers() { |
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2066 for (int ap = 0; ap < GCAllocPurposeCount; ++ap) { |
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2067 size_t waste = _alloc_buffers[ap]->words_remaining(); |
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2068 add_to_alloc_buffer_waste(waste); |
|
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2069 _alloc_buffers[ap]->retire(true, false); |
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2070 } |
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2071 } |
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2072 |
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2073 template <class T> void deal_with_reference(T* ref_to_scan) { |
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2074 if (has_partial_array_mask(ref_to_scan)) { |
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2075 _partial_scan_cl->do_oop_nv(ref_to_scan); |
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2076 } else { |
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2077 // Note: we can use "raw" versions of "region_containing" because |
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2078 // "obj_to_scan" is definitely in the heap, and is not in a |
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2079 // humongous region. |
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2080 HeapRegion* r = _g1h->heap_region_containing_raw(ref_to_scan); |
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2081 _evac_cl->set_region(r); |
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2082 _evac_cl->do_oop_nv(ref_to_scan); |
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2083 } |
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2084 } |
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2085 |
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2086 void deal_with_reference(StarTask ref) { |
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2087 assert(verify_task(ref), "sanity"); |
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2088 if (ref.is_narrow()) { |
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2089 deal_with_reference((narrowOop*)ref); |
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2090 } else { |
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2091 deal_with_reference((oop*)ref); |
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2092 } |
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2093 } |
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2094 |
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2095 public: |
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2096 void trim_queue(); |
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2097 }; |
| 1972 | 2098 |
| 2099 #endif // SHARE_VM_GC_IMPLEMENTATION_G1_G1COLLECTEDHEAP_HPP |