Mercurial > hg > graal-compiler
annotate src/share/vm/gc_implementation/g1/g1CollectedHeap.hpp @ 6007:5c86f8211d1e
7160728: Introduce an extra logging level for G1 logging
Summary: Added log levels "fine", "finer" and "finest". Let PrintGC map to "fine" and PrintGCDetails map to "finer". Separated out the per worker information in the G1 logging to the "finest" level.
Reviewed-by: stefank, jwilhelm, tonyp, johnc
| author | brutisso |
|---|---|
| date | Fri, 13 Apr 2012 01:59:38 +0200 |
| parents | 2a0172480595 |
| children | b632e80fc9dc |
| rev | line source |
|---|---|
| 342 | 1 /* |
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2 * Copyright (c) 2001, 2012, Oracle and/or its affiliates. All rights reserved. |
| 342 | 3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
| 4 * | |
| 5 * This code is free software; you can redistribute it and/or modify it | |
| 6 * under the terms of the GNU General Public License version 2 only, as | |
| 7 * published by the Free Software Foundation. | |
| 8 * | |
| 9 * This code is distributed in the hope that it will be useful, but WITHOUT | |
| 10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or | |
| 11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License | |
| 12 * version 2 for more details (a copy is included in the LICENSE file that | |
| 13 * accompanied this code). | |
| 14 * | |
| 15 * You should have received a copy of the GNU General Public License version | |
| 16 * 2 along with this work; if not, write to the Free Software Foundation, | |
| 17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. | |
| 18 * | |
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19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
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20 * or visit www.oracle.com if you need additional information or have any |
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21 * questions. |
| 342 | 22 * |
| 23 */ | |
| 24 | |
| 1972 | 25 #ifndef SHARE_VM_GC_IMPLEMENTATION_G1_G1COLLECTEDHEAP_HPP |
| 26 #define SHARE_VM_GC_IMPLEMENTATION_G1_G1COLLECTEDHEAP_HPP | |
| 27 | |
| 28 #include "gc_implementation/g1/concurrentMark.hpp" | |
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29 #include "gc_implementation/g1/g1AllocRegion.hpp" |
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30 #include "gc_implementation/g1/g1HRPrinter.hpp" |
| 1972 | 31 #include "gc_implementation/g1/g1RemSet.hpp" |
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32 #include "gc_implementation/g1/g1MonitoringSupport.hpp" |
| 3766 | 33 #include "gc_implementation/g1/heapRegionSeq.hpp" |
| 2152 | 34 #include "gc_implementation/g1/heapRegionSets.hpp" |
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35 #include "gc_implementation/shared/hSpaceCounters.hpp" |
| 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. | |
| 5987 | 202 template <bool do_gen_barrier, G1Barrier barrier, bool do_mark_object> |
| 203 friend class G1ParCopyClosure; | |
| 342 | 204 friend class G1IsAliveClosure; |
| 205 friend class G1EvacuateFollowersClosure; | |
| 206 friend class G1ParScanThreadState; | |
| 207 friend class G1ParScanClosureSuper; | |
| 208 friend class G1ParEvacuateFollowersClosure; | |
| 209 friend class G1ParTask; | |
| 210 friend class G1FreeGarbageRegionClosure; | |
| 211 friend class RefineCardTableEntryClosure; | |
| 212 friend class G1PrepareCompactClosure; | |
| 213 friend class RegionSorter; | |
| 2152 | 214 friend class RegionResetter; |
| 342 | 215 friend class CountRCClosure; |
| 216 friend class EvacPopObjClosure; | |
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217 friend class G1ParCleanupCTTask; |
| 342 | 218 |
| 219 // Other related classes. | |
| 220 friend class G1MarkSweep; | |
| 221 | |
| 222 private: | |
| 223 // The one and only G1CollectedHeap, so static functions can find it. | |
| 224 static G1CollectedHeap* _g1h; | |
| 225 | |
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226 static size_t _humongous_object_threshold_in_words; |
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227 |
| 342 | 228 // Storage for the G1 heap (excludes the permanent generation). |
| 229 VirtualSpace _g1_storage; | |
| 230 MemRegion _g1_reserved; | |
| 231 | |
| 232 // The part of _g1_storage that is currently committed. | |
| 233 MemRegion _g1_committed; | |
| 234 | |
| 2152 | 235 // The master free list. It will satisfy all new region allocations. |
| 236 MasterFreeRegionList _free_list; | |
| 237 | |
| 238 // The secondary free list which contains regions that have been | |
| 239 // freed up during the cleanup process. This will be appended to the | |
| 240 // master free list when appropriate. | |
| 241 SecondaryFreeRegionList _secondary_free_list; | |
| 242 | |
| 4072 | 243 // It keeps track of the old regions. |
| 244 MasterOldRegionSet _old_set; | |
| 245 | |
| 2152 | 246 // It keeps track of the humongous regions. |
| 247 MasterHumongousRegionSet _humongous_set; | |
| 342 | 248 |
| 249 // The number of regions we could create by expansion. | |
| 250 size_t _expansion_regions; | |
| 251 | |
| 252 // The block offset table for the G1 heap. | |
| 253 G1BlockOffsetSharedArray* _bot_shared; | |
| 254 | |
| 4072 | 255 // Tears down the region sets / lists so that they are empty and the |
| 256 // regions on the heap do not belong to a region set / list. The | |
| 257 // only exception is the humongous set which we leave unaltered. If | |
| 258 // free_list_only is true, it will only tear down the master free | |
| 259 // list. It is called before a Full GC (free_list_only == false) or | |
| 260 // before heap shrinking (free_list_only == true). | |
| 261 void tear_down_region_sets(bool free_list_only); | |
| 262 | |
| 263 // Rebuilds the region sets / lists so that they are repopulated to | |
| 264 // reflect the contents of the heap. The only exception is the | |
| 265 // humongous set which was not torn down in the first place. If | |
| 266 // free_list_only is true, it will only rebuild the master free | |
| 267 // list. It is called after a Full GC (free_list_only == false) or | |
| 268 // after heap shrinking (free_list_only == true). | |
| 269 void rebuild_region_sets(bool free_list_only); | |
| 342 | 270 |
| 271 // The sequence of all heap regions in the heap. | |
| 3766 | 272 HeapRegionSeq _hrs; |
| 342 | 273 |
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274 // Alloc region used to satisfy mutator allocation requests. |
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275 MutatorAllocRegion _mutator_alloc_region; |
| 342 | 276 |
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277 // Alloc region used to satisfy allocation requests by the GC for |
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278 // survivor objects. |
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279 SurvivorGCAllocRegion _survivor_gc_alloc_region; |
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280 |
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281 // Alloc region used to satisfy allocation requests by the GC for |
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282 // old objects. |
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283 OldGCAllocRegion _old_gc_alloc_region; |
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284 |
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285 // The last old region we allocated to during the last GC. |
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286 // Typically, it is not full so we should re-use it during the next GC. |
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287 HeapRegion* _retained_old_gc_alloc_region; |
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288 |
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289 // It specifies whether we should attempt to expand the heap after a |
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290 // region allocation failure. If heap expansion fails we set this to |
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291 // false so that we don't re-attempt the heap expansion (it's likely |
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292 // that subsequent expansion attempts will also fail if one fails). |
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293 // Currently, it is only consulted during GC and it's reset at the |
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294 // start of each GC. |
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295 bool _expand_heap_after_alloc_failure; |
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296 |
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297 // It resets the mutator alloc region before new allocations can take place. |
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298 void init_mutator_alloc_region(); |
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299 |
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300 // It releases the mutator alloc region. |
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301 void release_mutator_alloc_region(); |
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302 |
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303 // It initializes the GC alloc regions at the start of a GC. |
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304 void init_gc_alloc_regions(); |
| 342 | 305 |
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306 // It releases the GC alloc regions at the end of a GC. |
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307 void release_gc_alloc_regions(); |
| 342 | 308 |
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309 // It does any cleanup that needs to be done on the GC alloc regions |
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310 // before a Full GC. |
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311 void abandon_gc_alloc_regions(); |
| 342 | 312 |
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313 // Helper for monitoring and management support. |
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314 G1MonitoringSupport* _g1mm; |
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315 |
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316 // Determines PLAB size for a particular allocation purpose. |
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317 static size_t desired_plab_sz(GCAllocPurpose purpose); |
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318 |
| 342 | 319 // Outside of GC pauses, the number of bytes used in all regions other |
| 320 // than the current allocation region. | |
| 321 size_t _summary_bytes_used; | |
| 322 | |
| 526 | 323 // This is used for a quick test on whether a reference points into |
| 324 // the collection set or not. Basically, we have an array, with one | |
| 325 // byte per region, and that byte denotes whether the corresponding | |
| 326 // region is in the collection set or not. The entry corresponding | |
| 327 // the bottom of the heap, i.e., region 0, is pointed to by | |
| 328 // _in_cset_fast_test_base. The _in_cset_fast_test field has been | |
| 329 // biased so that it actually points to address 0 of the address | |
| 330 // space, to make the test as fast as possible (we can simply shift | |
| 331 // the address to address into it, instead of having to subtract the | |
| 332 // bottom of the heap from the address before shifting it; basically | |
| 333 // it works in the same way the card table works). | |
| 334 bool* _in_cset_fast_test; | |
| 335 | |
| 336 // The allocated array used for the fast test on whether a reference | |
| 337 // points into the collection set or not. This field is also used to | |
| 338 // free the array. | |
| 339 bool* _in_cset_fast_test_base; | |
| 340 | |
| 341 // The length of the _in_cset_fast_test_base array. | |
| 342 size_t _in_cset_fast_test_length; | |
| 343 | |
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344 volatile unsigned _gc_time_stamp; |
| 342 | 345 |
| 346 size_t* _surviving_young_words; | |
| 347 | |
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348 G1HRPrinter _hr_printer; |
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349 |
| 342 | 350 void setup_surviving_young_words(); |
| 351 void update_surviving_young_words(size_t* surv_young_words); | |
| 352 void cleanup_surviving_young_words(); | |
| 353 | |
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354 // It decides whether an explicit GC should start a concurrent cycle |
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355 // instead of doing a STW GC. Currently, a concurrent cycle is |
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356 // explicitly started if: |
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357 // (a) cause == _gc_locker and +GCLockerInvokesConcurrent, or |
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358 // (b) cause == _java_lang_system_gc and +ExplicitGCInvokesConcurrent. |
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359 // (c) cause == _g1_humongous_allocation |
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360 bool should_do_concurrent_full_gc(GCCause::Cause cause); |
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361 |
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362 // Keeps track of how many "full collections" (i.e., Full GCs or |
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363 // concurrent cycles) we have completed. The number of them we have |
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364 // started is maintained in _total_full_collections in CollectedHeap. |
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365 volatile unsigned int _full_collections_completed; |
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366 |
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367 // This is a non-product method that is helpful for testing. It is |
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368 // called at the end of a GC and artificially expands the heap by |
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369 // allocating a number of dead regions. This way we can induce very |
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370 // frequent marking cycles and stress the cleanup / concurrent |
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371 // cleanup code more (as all the regions that will be allocated by |
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372 // this method will be found dead by the marking cycle). |
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373 void allocate_dummy_regions() PRODUCT_RETURN; |
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374 |
| 1973 | 375 // These are macros so that, if the assert fires, we get the correct |
| 376 // line number, file, etc. | |
| 377 | |
| 2361 | 378 #define heap_locking_asserts_err_msg(_extra_message_) \ |
| 2152 | 379 err_msg("%s : Heap_lock locked: %s, at safepoint: %s, is VM thread: %s", \ |
| 2361 | 380 (_extra_message_), \ |
| 2152 | 381 BOOL_TO_STR(Heap_lock->owned_by_self()), \ |
| 382 BOOL_TO_STR(SafepointSynchronize::is_at_safepoint()), \ | |
| 383 BOOL_TO_STR(Thread::current()->is_VM_thread())) | |
| 1973 | 384 |
| 385 #define assert_heap_locked() \ | |
| 386 do { \ | |
| 387 assert(Heap_lock->owned_by_self(), \ | |
| 388 heap_locking_asserts_err_msg("should be holding the Heap_lock")); \ | |
| 389 } while (0) | |
| 390 | |
| 2361 | 391 #define assert_heap_locked_or_at_safepoint(_should_be_vm_thread_) \ |
| 1973 | 392 do { \ |
| 393 assert(Heap_lock->owned_by_self() || \ | |
| 2152 | 394 (SafepointSynchronize::is_at_safepoint() && \ |
| 2361 | 395 ((_should_be_vm_thread_) == Thread::current()->is_VM_thread())), \ |
| 1973 | 396 heap_locking_asserts_err_msg("should be holding the Heap_lock or " \ |
| 397 "should be at a safepoint")); \ | |
| 398 } while (0) | |
| 399 | |
| 400 #define assert_heap_locked_and_not_at_safepoint() \ | |
| 401 do { \ | |
| 402 assert(Heap_lock->owned_by_self() && \ | |
| 403 !SafepointSynchronize::is_at_safepoint(), \ | |
| 404 heap_locking_asserts_err_msg("should be holding the Heap_lock and " \ | |
| 405 "should not be at a safepoint")); \ | |
| 406 } while (0) | |
| 407 | |
| 408 #define assert_heap_not_locked() \ | |
| 409 do { \ | |
| 410 assert(!Heap_lock->owned_by_self(), \ | |
| 411 heap_locking_asserts_err_msg("should not be holding the Heap_lock")); \ | |
| 412 } while (0) | |
| 413 | |
| 414 #define assert_heap_not_locked_and_not_at_safepoint() \ | |
| 415 do { \ | |
| 416 assert(!Heap_lock->owned_by_self() && \ | |
| 417 !SafepointSynchronize::is_at_safepoint(), \ | |
| 418 heap_locking_asserts_err_msg("should not be holding the Heap_lock and " \ | |
| 419 "should not be at a safepoint")); \ | |
| 420 } while (0) | |
| 421 | |
| 2361 | 422 #define assert_at_safepoint(_should_be_vm_thread_) \ |
| 1973 | 423 do { \ |
| 2152 | 424 assert(SafepointSynchronize::is_at_safepoint() && \ |
| 2361 | 425 ((_should_be_vm_thread_) == Thread::current()->is_VM_thread()), \ |
| 1973 | 426 heap_locking_asserts_err_msg("should be at a safepoint")); \ |
| 427 } while (0) | |
| 428 | |
| 429 #define assert_not_at_safepoint() \ | |
| 430 do { \ | |
| 431 assert(!SafepointSynchronize::is_at_safepoint(), \ | |
| 432 heap_locking_asserts_err_msg("should not be at a safepoint")); \ | |
| 433 } while (0) | |
| 434 | |
| 342 | 435 protected: |
| 436 | |
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437 // The young region list. |
| 342 | 438 YoungList* _young_list; |
| 439 | |
| 440 // The current policy object for the collector. | |
| 441 G1CollectorPolicy* _g1_policy; | |
| 442 | |
| 2152 | 443 // This is the second level of trying to allocate a new region. If |
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444 // new_region() didn't find a region on the free_list, this call will |
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445 // check whether there's anything available on the |
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446 // secondary_free_list and/or wait for more regions to appear on |
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447 // that list, if _free_regions_coming is set. |
| 2361 | 448 HeapRegion* new_region_try_secondary_free_list(); |
| 342 | 449 |
| 2361 | 450 // Try to allocate a single non-humongous HeapRegion sufficient for |
| 451 // an allocation of the given word_size. If do_expand is true, | |
| 452 // attempt to expand the heap if necessary to satisfy the allocation | |
| 453 // request. | |
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454 HeapRegion* new_region(size_t word_size, bool do_expand); |
| 342 | 455 |
| 2361 | 456 // Attempt to satisfy a humongous allocation request of the given |
| 457 // size by finding a contiguous set of free regions of num_regions | |
| 458 // length and remove them from the master free list. Return the | |
| 3766 | 459 // index of the first region or G1_NULL_HRS_INDEX if the search |
| 460 // was unsuccessful. | |
| 461 size_t humongous_obj_allocate_find_first(size_t num_regions, | |
| 462 size_t word_size); | |
| 342 | 463 |
| 2361 | 464 // Initialize a contiguous set of free regions of length num_regions |
| 465 // and starting at index first so that they appear as a single | |
| 466 // humongous region. | |
| 3766 | 467 HeapWord* humongous_obj_allocate_initialize_regions(size_t first, |
| 2361 | 468 size_t num_regions, |
| 469 size_t word_size); | |
| 470 | |
| 471 // Attempt to allocate a humongous object of the given size. Return | |
| 472 // NULL if unsuccessful. | |
| 2152 | 473 HeapWord* humongous_obj_allocate(size_t word_size); |
| 1973 | 474 |
| 475 // The following two methods, allocate_new_tlab() and | |
| 476 // mem_allocate(), are the two main entry points from the runtime | |
| 477 // into the G1's allocation routines. They have the following | |
| 478 // assumptions: | |
| 479 // | |
| 480 // * They should both be called outside safepoints. | |
| 481 // | |
| 482 // * They should both be called without holding the Heap_lock. | |
| 483 // | |
| 484 // * All allocation requests for new TLABs should go to | |
| 485 // allocate_new_tlab(). | |
| 486 // | |
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487 // * All non-TLAB allocation requests should go to mem_allocate(). |
| 1973 | 488 // |
| 489 // * If either call cannot satisfy the allocation request using the | |
| 490 // current allocating region, they will try to get a new one. If | |
| 491 // this fails, they will attempt to do an evacuation pause and | |
| 492 // retry the allocation. | |
| 493 // | |
| 494 // * If all allocation attempts fail, even after trying to schedule | |
| 495 // an evacuation pause, allocate_new_tlab() will return NULL, | |
| 496 // whereas mem_allocate() will attempt a heap expansion and/or | |
| 497 // schedule a Full GC. | |
| 498 // | |
| 499 // * We do not allow humongous-sized TLABs. So, allocate_new_tlab | |
| 500 // should never be called with word_size being humongous. All | |
| 501 // humongous allocation requests should go to mem_allocate() which | |
| 502 // will satisfy them with a special path. | |
| 503 | |
| 504 virtual HeapWord* allocate_new_tlab(size_t word_size); | |
| 505 | |
| 506 virtual HeapWord* mem_allocate(size_t word_size, | |
| 507 bool* gc_overhead_limit_was_exceeded); | |
| 342 | 508 |
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509 // The following three methods take a gc_count_before_ret |
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510 // parameter which is used to return the GC count if the method |
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511 // returns NULL. Given that we are required to read the GC count |
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512 // while holding the Heap_lock, and these paths will take the |
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513 // Heap_lock at some point, it's easier to get them to read the GC |
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514 // count while holding the Heap_lock before they return NULL instead |
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515 // of the caller (namely: mem_allocate()) having to also take the |
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516 // Heap_lock just to read the GC count. |
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517 |
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518 // First-level mutator allocation attempt: try to allocate out of |
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519 // the mutator alloc region without taking the Heap_lock. This |
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520 // should only be used for non-humongous allocations. |
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521 inline HeapWord* attempt_allocation(size_t word_size, |
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522 unsigned int* gc_count_before_ret); |
| 342 | 523 |
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524 // Second-level mutator allocation attempt: take the Heap_lock and |
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525 // retry the allocation attempt, potentially scheduling a GC |
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526 // pause. This should only be used for non-humongous allocations. |
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527 HeapWord* attempt_allocation_slow(size_t word_size, |
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528 unsigned int* gc_count_before_ret); |
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529 |
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530 // Takes the Heap_lock and attempts a humongous allocation. It can |
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531 // potentially schedule a GC pause. |
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532 HeapWord* attempt_allocation_humongous(size_t word_size, |
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533 unsigned int* gc_count_before_ret); |
| 1973 | 534 |
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535 // Allocation attempt that should be called during safepoints (e.g., |
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536 // at the end of a successful GC). expect_null_mutator_alloc_region |
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537 // specifies whether the mutator alloc region is expected to be NULL |
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538 // or not. |
| 1973 | 539 HeapWord* attempt_allocation_at_safepoint(size_t word_size, |
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540 bool expect_null_mutator_alloc_region); |
| 1973 | 541 |
| 542 // It dirties the cards that cover the block so that so that the post | |
| 543 // write barrier never queues anything when updating objects on this | |
| 544 // block. It is assumed (and in fact we assert) that the block | |
| 545 // belongs to a young region. | |
| 546 inline void dirty_young_block(HeapWord* start, size_t word_size); | |
| 342 | 547 |
| 548 // Allocate blocks during garbage collection. Will ensure an | |
| 549 // allocation region, either by picking one or expanding the | |
| 550 // heap, and then allocate a block of the given size. The block | |
| 551 // may not be a humongous - it must fit into a single heap region. | |
| 552 HeapWord* par_allocate_during_gc(GCAllocPurpose purpose, size_t word_size); | |
| 553 | |
| 554 HeapWord* allocate_during_gc_slow(GCAllocPurpose purpose, | |
| 555 HeapRegion* alloc_region, | |
| 556 bool par, | |
| 557 size_t word_size); | |
| 558 | |
| 559 // Ensure that no further allocations can happen in "r", bearing in mind | |
| 560 // that parallel threads might be attempting allocations. | |
| 561 void par_allocate_remaining_space(HeapRegion* r); | |
| 562 | |
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563 // Allocation attempt during GC for a survivor object / PLAB. |
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564 inline HeapWord* survivor_attempt_allocation(size_t word_size); |
| 545 | 565 |
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566 // Allocation attempt during GC for an old object / PLAB. |
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567 inline HeapWord* old_attempt_allocation(size_t word_size); |
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568 |
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569 // These methods are the "callbacks" from the G1AllocRegion class. |
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570 |
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571 // For mutator alloc regions. |
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572 HeapRegion* new_mutator_alloc_region(size_t word_size, bool force); |
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573 void retire_mutator_alloc_region(HeapRegion* alloc_region, |
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574 size_t allocated_bytes); |
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575 |
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576 // For GC alloc regions. |
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577 HeapRegion* new_gc_alloc_region(size_t word_size, size_t count, |
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578 GCAllocPurpose ap); |
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579 void retire_gc_alloc_region(HeapRegion* alloc_region, |
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580 size_t allocated_bytes, GCAllocPurpose ap); |
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581 |
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582 // - if explicit_gc is true, the GC is for a System.gc() or a heap |
| 1973 | 583 // inspection request and should collect the entire heap |
| 584 // - if clear_all_soft_refs is true, all soft references should be | |
| 585 // cleared during the GC | |
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586 // - if explicit_gc is false, word_size describes the allocation that |
| 1973 | 587 // the GC should attempt (at least) to satisfy |
| 588 // - it returns false if it is unable to do the collection due to the | |
| 589 // GC locker being active, true otherwise | |
| 590 bool do_collection(bool explicit_gc, | |
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591 bool clear_all_soft_refs, |
| 342 | 592 size_t word_size); |
| 593 | |
| 594 // Callback from VM_G1CollectFull operation. | |
| 595 // Perform a full collection. | |
| 596 void do_full_collection(bool clear_all_soft_refs); | |
| 597 | |
| 598 // Resize the heap if necessary after a full collection. If this is | |
| 599 // after a collect-for allocation, "word_size" is the allocation size, | |
| 600 // and will be considered part of the used portion of the heap. | |
| 601 void resize_if_necessary_after_full_collection(size_t word_size); | |
| 602 | |
| 603 // Callback from VM_G1CollectForAllocation operation. | |
| 604 // This function does everything necessary/possible to satisfy a | |
| 605 // failed allocation request (including collection, expansion, etc.) | |
| 1973 | 606 HeapWord* satisfy_failed_allocation(size_t word_size, bool* succeeded); |
| 342 | 607 |
| 608 // Attempting to expand the heap sufficiently | |
| 609 // to support an allocation of the given "word_size". If | |
| 610 // successful, perform the allocation and return the address of the | |
| 611 // allocated block, or else "NULL". | |
| 1973 | 612 HeapWord* expand_and_allocate(size_t word_size); |
| 342 | 613 |
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614 // Process any reference objects discovered during |
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615 // an incremental evacuation pause. |
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616 void process_discovered_references(); |
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617 |
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618 // Enqueue any remaining discovered references |
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619 // after processing. |
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620 void enqueue_discovered_references(); |
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621 |
| 342 | 622 public: |
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623 |
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624 G1MonitoringSupport* g1mm() { |
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625 assert(_g1mm != NULL, "should have been initialized"); |
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626 return _g1mm; |
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627 } |
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628 |
| 342 | 629 // Expand the garbage-first heap by at least the given size (in bytes!). |
|
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630 // Returns true if the heap was expanded by the requested amount; |
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631 // false otherwise. |
| 342 | 632 // (Rounds up to a HeapRegion boundary.) |
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633 bool expand(size_t expand_bytes); |
| 342 | 634 |
| 635 // Do anything common to GC's. | |
| 636 virtual void gc_prologue(bool full); | |
| 637 virtual void gc_epilogue(bool full); | |
| 638 | |
| 526 | 639 // We register a region with the fast "in collection set" test. We |
| 640 // simply set to true the array slot corresponding to this region. | |
| 641 void register_region_with_in_cset_fast_test(HeapRegion* r) { | |
| 642 assert(_in_cset_fast_test_base != NULL, "sanity"); | |
| 643 assert(r->in_collection_set(), "invariant"); | |
| 3766 | 644 size_t index = r->hrs_index(); |
| 645 assert(index < _in_cset_fast_test_length, "invariant"); | |
| 526 | 646 assert(!_in_cset_fast_test_base[index], "invariant"); |
| 647 _in_cset_fast_test_base[index] = true; | |
| 648 } | |
| 649 | |
| 650 // This is a fast test on whether a reference points into the | |
| 651 // collection set or not. It does not assume that the reference | |
| 652 // points into the heap; if it doesn't, it will return false. | |
| 653 bool in_cset_fast_test(oop obj) { | |
| 654 assert(_in_cset_fast_test != NULL, "sanity"); | |
| 655 if (_g1_committed.contains((HeapWord*) obj)) { | |
| 656 // no need to subtract the bottom of the heap from obj, | |
| 657 // _in_cset_fast_test is biased | |
| 658 size_t index = ((size_t) obj) >> HeapRegion::LogOfHRGrainBytes; | |
| 659 bool ret = _in_cset_fast_test[index]; | |
| 660 // let's make sure the result is consistent with what the slower | |
| 661 // test returns | |
| 662 assert( ret || !obj_in_cs(obj), "sanity"); | |
| 663 assert(!ret || obj_in_cs(obj), "sanity"); | |
| 664 return ret; | |
| 665 } else { | |
| 666 return false; | |
| 667 } | |
| 668 } | |
| 669 | |
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670 void clear_cset_fast_test() { |
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671 assert(_in_cset_fast_test_base != NULL, "sanity"); |
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672 memset(_in_cset_fast_test_base, false, |
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673 _in_cset_fast_test_length * sizeof(bool)); |
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674 } |
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675 |
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676 // This is called at the end of either a concurrent cycle or a Full |
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677 // GC to update the number of full collections completed. Those two |
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678 // can happen in a nested fashion, i.e., we start a concurrent |
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679 // cycle, a Full GC happens half-way through it which ends first, |
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680 // and then the cycle notices that a Full GC happened and ends |
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681 // too. The concurrent parameter is a boolean to help us do a bit |
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682 // tighter consistency checking in the method. If concurrent is |
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683 // false, the caller is the inner caller in the nesting (i.e., the |
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684 // Full GC). If concurrent is true, the caller is the outer caller |
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685 // in this nesting (i.e., the concurrent cycle). Further nesting is |
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686 // not currently supported. The end of the this call also notifies |
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687 // the FullGCCount_lock in case a Java thread is waiting for a full |
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688 // GC to happen (e.g., it called System.gc() with |
|
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689 // +ExplicitGCInvokesConcurrent). |
|
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690 void increment_full_collections_completed(bool concurrent); |
|
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691 |
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692 unsigned int full_collections_completed() { |
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693 return _full_collections_completed; |
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694 } |
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695 |
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696 G1HRPrinter* hr_printer() { return &_hr_printer; } |
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697 |
| 342 | 698 protected: |
| 699 | |
| 700 // Shrink the garbage-first heap by at most the given size (in bytes!). | |
| 701 // (Rounds down to a HeapRegion boundary.) | |
| 702 virtual void shrink(size_t expand_bytes); | |
| 703 void shrink_helper(size_t expand_bytes); | |
| 704 | |
| 1709 | 705 #if TASKQUEUE_STATS |
| 706 static void print_taskqueue_stats_hdr(outputStream* const st = gclog_or_tty); | |
| 707 void print_taskqueue_stats(outputStream* const st = gclog_or_tty) const; | |
| 708 void reset_taskqueue_stats(); | |
| 709 #endif // TASKQUEUE_STATS | |
| 710 | |
| 1973 | 711 // Schedule the VM operation that will do an evacuation pause to |
| 712 // satisfy an allocation request of word_size. *succeeded will | |
| 713 // return whether the VM operation was successful (it did do an | |
| 714 // evacuation pause) or not (another thread beat us to it or the GC | |
| 715 // locker was active). Given that we should not be holding the | |
| 716 // Heap_lock when we enter this method, we will pass the | |
| 717 // gc_count_before (i.e., total_collections()) as a parameter since | |
| 718 // it has to be read while holding the Heap_lock. Currently, both | |
| 719 // methods that call do_collection_pause() release the Heap_lock | |
| 720 // before the call, so it's easy to read gc_count_before just before. | |
| 721 HeapWord* do_collection_pause(size_t word_size, | |
| 722 unsigned int gc_count_before, | |
| 723 bool* succeeded); | |
| 342 | 724 |
| 725 // The guts of the incremental collection pause, executed by the vm | |
| 1973 | 726 // thread. It returns false if it is unable to do the collection due |
| 727 // to the GC locker being active, true otherwise | |
| 728 bool do_collection_pause_at_safepoint(double target_pause_time_ms); | |
| 342 | 729 |
| 730 // Actually do the work of evacuating the collection set. | |
| 1973 | 731 void evacuate_collection_set(); |
| 342 | 732 |
| 733 // The g1 remembered set of the heap. | |
| 734 G1RemSet* _g1_rem_set; | |
| 735 // And it's mod ref barrier set, used to track updates for the above. | |
| 736 ModRefBarrierSet* _mr_bs; | |
| 737 | |
|
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738 // A set of cards that cover the objects for which the Rsets should be updated |
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739 // concurrently after the collection. |
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740 DirtyCardQueueSet _dirty_card_queue_set; |
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741 |
| 342 | 742 // The Heap Region Rem Set Iterator. |
| 743 HeapRegionRemSetIterator** _rem_set_iterator; | |
| 744 | |
| 745 // The closure used to refine a single card. | |
| 746 RefineCardTableEntryClosure* _refine_cte_cl; | |
| 747 | |
| 748 // A function to check the consistency of dirty card logs. | |
| 749 void check_ct_logs_at_safepoint(); | |
| 750 | |
| 1705 | 751 // A DirtyCardQueueSet that is used to hold cards that contain |
| 752 // references into the current collection set. This is used to | |
| 753 // update the remembered sets of the regions in the collection | |
| 754 // set in the event of an evacuation failure. | |
| 755 DirtyCardQueueSet _into_cset_dirty_card_queue_set; | |
| 756 | |
| 342 | 757 // After a collection pause, make the regions in the CS into free |
| 758 // regions. | |
| 759 void free_collection_set(HeapRegion* cs_head); | |
| 760 | |
|
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761 // Abandon the current collection set without recording policy |
|
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762 // statistics or updating free lists. |
|
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763 void abandon_collection_set(HeapRegion* cs_head); |
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764 |
| 342 | 765 // Applies "scan_non_heap_roots" to roots outside the heap, |
| 766 // "scan_rs" to roots inside the heap (having done "set_region" to | |
| 767 // indicate the region in which the root resides), and does "scan_perm" | |
| 768 // (setting the generation to the perm generation.) If "scan_rs" is | |
| 769 // NULL, then this step is skipped. The "worker_i" | |
| 770 // param is for use with parallel roots processing, and should be | |
| 771 // the "i" of the calling parallel worker thread's work(i) function. | |
| 772 // In the sequential case this param will be ignored. | |
| 773 void g1_process_strong_roots(bool collecting_perm_gen, | |
|
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774 ScanningOption so, |
| 342 | 775 OopClosure* scan_non_heap_roots, |
| 776 OopsInHeapRegionClosure* scan_rs, | |
| 777 OopsInGenClosure* scan_perm, | |
| 778 int worker_i); | |
| 779 | |
| 780 // Apply "blk" to all the weak roots of the system. These include | |
| 781 // JNI weak roots, the code cache, system dictionary, symbol table, | |
| 782 // string table, and referents of reachable weak refs. | |
| 783 void g1_process_weak_roots(OopClosure* root_closure, | |
| 784 OopClosure* non_root_closure); | |
| 785 | |
| 2361 | 786 // Frees a non-humongous region by initializing its contents and |
| 2152 | 787 // adding it to the free list that's passed as a parameter (this is |
| 788 // usually a local list which will be appended to the master free | |
| 789 // list later). The used bytes of freed regions are accumulated in | |
| 790 // pre_used. If par is true, the region's RSet will not be freed | |
| 791 // up. The assumption is that this will be done later. | |
| 792 void free_region(HeapRegion* hr, | |
| 793 size_t* pre_used, | |
| 794 FreeRegionList* free_list, | |
| 795 bool par); | |
| 342 | 796 |
| 2361 | 797 // Frees a humongous region by collapsing it into individual regions |
| 798 // and calling free_region() for each of them. The freed regions | |
| 799 // will be added to the free list that's passed as a parameter (this | |
| 800 // is usually a local list which will be appended to the master free | |
| 801 // list later). The used bytes of freed regions are accumulated in | |
| 802 // pre_used. If par is true, the region's RSet will not be freed | |
| 803 // up. The assumption is that this will be done later. | |
| 2152 | 804 void free_humongous_region(HeapRegion* hr, |
| 805 size_t* pre_used, | |
| 806 FreeRegionList* free_list, | |
| 807 HumongousRegionSet* humongous_proxy_set, | |
| 808 bool par); | |
| 342 | 809 |
| 3766 | 810 // Notifies all the necessary spaces that the committed space has |
| 811 // been updated (either expanded or shrunk). It should be called | |
| 812 // after _g1_storage is updated. | |
| 813 void update_committed_space(HeapWord* old_end, HeapWord* new_end); | |
| 814 | |
| 342 | 815 // The concurrent marker (and the thread it runs in.) |
| 816 ConcurrentMark* _cm; | |
| 817 ConcurrentMarkThread* _cmThread; | |
| 818 bool _mark_in_progress; | |
| 819 | |
| 820 // The concurrent refiner. | |
| 821 ConcurrentG1Refine* _cg1r; | |
| 822 | |
| 823 // The parallel task queues | |
| 824 RefToScanQueueSet *_task_queues; | |
| 825 | |
| 826 // True iff a evacuation has failed in the current collection. | |
| 827 bool _evacuation_failed; | |
| 828 | |
| 829 // Set the attribute indicating whether evacuation has failed in the | |
| 830 // current collection. | |
| 831 void set_evacuation_failed(bool b) { _evacuation_failed = b; } | |
| 832 | |
| 833 // Failed evacuations cause some logical from-space objects to have | |
| 834 // forwarding pointers to themselves. Reset them. | |
| 835 void remove_self_forwarding_pointers(); | |
| 836 | |
| 837 // When one is non-null, so is the other. Together, they each pair is | |
| 838 // an object with a preserved mark, and its mark value. | |
| 839 GrowableArray<oop>* _objs_with_preserved_marks; | |
| 840 GrowableArray<markOop>* _preserved_marks_of_objs; | |
| 841 | |
| 842 // Preserve the mark of "obj", if necessary, in preparation for its mark | |
| 843 // word being overwritten with a self-forwarding-pointer. | |
| 844 void preserve_mark_if_necessary(oop obj, markOop m); | |
| 845 | |
| 846 // The stack of evac-failure objects left to be scanned. | |
| 847 GrowableArray<oop>* _evac_failure_scan_stack; | |
| 848 // The closure to apply to evac-failure objects. | |
| 849 | |
| 850 OopsInHeapRegionClosure* _evac_failure_closure; | |
| 851 // Set the field above. | |
| 852 void | |
| 853 set_evac_failure_closure(OopsInHeapRegionClosure* evac_failure_closure) { | |
| 854 _evac_failure_closure = evac_failure_closure; | |
| 855 } | |
| 856 | |
| 857 // Push "obj" on the scan stack. | |
| 858 void push_on_evac_failure_scan_stack(oop obj); | |
| 859 // Process scan stack entries until the stack is empty. | |
| 860 void drain_evac_failure_scan_stack(); | |
| 861 // True iff an invocation of "drain_scan_stack" is in progress; to | |
| 862 // prevent unnecessary recursion. | |
| 863 bool _drain_in_progress; | |
| 864 | |
| 865 // Do any necessary initialization for evacuation-failure handling. | |
| 866 // "cl" is the closure that will be used to process evac-failure | |
| 867 // objects. | |
| 868 void init_for_evac_failure(OopsInHeapRegionClosure* cl); | |
| 869 // Do any necessary cleanup for evacuation-failure handling data | |
| 870 // structures. | |
| 871 void finalize_for_evac_failure(); | |
| 872 | |
| 873 // An attempt to evacuate "obj" has failed; take necessary steps. | |
|
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874 oop handle_evacuation_failure_par(OopsInHeapRegionClosure* cl, oop obj); |
| 342 | 875 void handle_evacuation_failure_common(oop obj, markOop m); |
| 876 | |
|
3979
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877 // ("Weak") Reference processing support. |
|
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878 // |
|
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879 // G1 has 2 instances of the referece processor class. One |
|
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880 // (_ref_processor_cm) handles reference object discovery |
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881 // and subsequent processing during concurrent marking cycles. |
|
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882 // |
|
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883 // The other (_ref_processor_stw) handles reference object |
|
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884 // discovery and processing during full GCs and incremental |
|
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|
885 // evacuation pauses. |
|
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886 // |
|
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|
887 // During an incremental pause, reference discovery will be |
|
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|
888 // temporarily disabled for _ref_processor_cm and will be |
|
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889 // enabled for _ref_processor_stw. At the end of the evacuation |
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890 // pause references discovered by _ref_processor_stw will be |
|
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|
891 // processed and discovery will be disabled. The previous |
|
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892 // setting for reference object discovery for _ref_processor_cm |
|
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893 // will be re-instated. |
|
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894 // |
|
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895 // At the start of marking: |
|
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896 // * Discovery by the CM ref processor is verified to be inactive |
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897 // and it's discovered lists are empty. |
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898 // * Discovery by the CM ref processor is then enabled. |
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899 // |
|
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900 // At the end of marking: |
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901 // * Any references on the CM ref processor's discovered |
|
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902 // lists are processed (possibly MT). |
|
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903 // |
|
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904 // At the start of full GC we: |
|
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905 // * Disable discovery by the CM ref processor and |
|
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|
906 // empty CM ref processor's discovered lists |
|
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907 // (without processing any entries). |
|
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908 // * Verify that the STW ref processor is inactive and it's |
|
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909 // discovered lists are empty. |
|
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910 // * Temporarily set STW ref processor discovery as single threaded. |
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911 // * Temporarily clear the STW ref processor's _is_alive_non_header |
|
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912 // field. |
|
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913 // * Finally enable discovery by the STW ref processor. |
|
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914 // |
|
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915 // The STW ref processor is used to record any discovered |
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916 // references during the full GC. |
|
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|
917 // |
|
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918 // At the end of a full GC we: |
|
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919 // * Enqueue any reference objects discovered by the STW ref processor |
|
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|
920 // that have non-live referents. This has the side-effect of |
|
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921 // making the STW ref processor inactive by disabling discovery. |
|
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922 // * Verify that the CM ref processor is still inactive |
|
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923 // and no references have been placed on it's discovered |
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924 // lists (also checked as a precondition during initial marking). |
|
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|
925 |
|
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926 // The (stw) reference processor... |
|
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|
927 ReferenceProcessor* _ref_processor_stw; |
|
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928 |
|
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929 // During reference object discovery, the _is_alive_non_header |
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930 // closure (if non-null) is applied to the referent object to |
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931 // determine whether the referent is live. If so then the |
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932 // reference object does not need to be 'discovered' and can |
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933 // be treated as a regular oop. This has the benefit of reducing |
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934 // the number of 'discovered' reference objects that need to |
|
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935 // be processed. |
|
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936 // |
|
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937 // Instance of the is_alive closure for embedding into the |
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938 // STW reference processor as the _is_alive_non_header field. |
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939 // Supplying a value for the _is_alive_non_header field is |
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940 // optional but doing so prevents unnecessary additions to |
|
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941 // the discovered lists during reference discovery. |
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942 G1STWIsAliveClosure _is_alive_closure_stw; |
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943 |
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944 // The (concurrent marking) reference processor... |
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945 ReferenceProcessor* _ref_processor_cm; |
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946 |
|
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947 // Instance of the concurrent mark is_alive closure for embedding |
|
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948 // into the Concurrent Marking reference processor as the |
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949 // _is_alive_non_header field. Supplying a value for the |
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950 // _is_alive_non_header field is optional but doing so prevents |
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951 // unnecessary additions to the discovered lists during reference |
|
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952 // discovery. |
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953 G1CMIsAliveClosure _is_alive_closure_cm; |
| 342 | 954 |
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955 // Cache used by G1CollectedHeap::start_cset_region_for_worker(). |
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956 HeapRegion** _worker_cset_start_region; |
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957 |
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958 // Time stamp to validate the regions recorded in the cache |
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959 // used by G1CollectedHeap::start_cset_region_for_worker(). |
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960 // The heap region entry for a given worker is valid iff |
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961 // the associated time stamp value matches the current value |
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962 // of G1CollectedHeap::_gc_time_stamp. |
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963 unsigned int* _worker_cset_start_region_time_stamp; |
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964 |
| 342 | 965 enum G1H_process_strong_roots_tasks { |
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966 G1H_PS_filter_satb_buffers, |
| 342 | 967 G1H_PS_refProcessor_oops_do, |
| 968 // Leave this one last. | |
| 969 G1H_PS_NumElements | |
| 970 }; | |
| 971 | |
| 972 SubTasksDone* _process_strong_tasks; | |
| 973 | |
| 2152 | 974 volatile bool _free_regions_coming; |
| 342 | 975 |
| 976 public: | |
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977 |
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978 SubTasksDone* process_strong_tasks() { return _process_strong_tasks; } |
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979 |
| 342 | 980 void set_refine_cte_cl_concurrency(bool concurrent); |
| 981 | |
| 1709 | 982 RefToScanQueue *task_queue(int i) const; |
| 342 | 983 |
|
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984 // A set of cards where updates happened during the GC |
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985 DirtyCardQueueSet& dirty_card_queue_set() { return _dirty_card_queue_set; } |
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986 |
| 1705 | 987 // A DirtyCardQueueSet that is used to hold cards that contain |
| 988 // references into the current collection set. This is used to | |
| 989 // update the remembered sets of the regions in the collection | |
| 990 // set in the event of an evacuation failure. | |
| 991 DirtyCardQueueSet& into_cset_dirty_card_queue_set() | |
| 992 { return _into_cset_dirty_card_queue_set; } | |
| 993 | |
| 342 | 994 // Create a G1CollectedHeap with the specified policy. |
| 995 // Must call the initialize method afterwards. | |
| 996 // May not return if something goes wrong. | |
| 997 G1CollectedHeap(G1CollectorPolicy* policy); | |
| 998 | |
| 999 // Initialize the G1CollectedHeap to have the initial and | |
| 1000 // maximum sizes, permanent generation, and remembered and barrier sets | |
| 1001 // specified by the policy object. | |
| 1002 jint initialize(); | |
| 1003 | |
|
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1004 // Initialize weak reference processing. |
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1005 virtual void ref_processing_init(); |
| 342 | 1006 |
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1007 void set_par_threads(uint t) { |
| 342 | 1008 SharedHeap::set_par_threads(t); |
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1009 // Done in SharedHeap but oddly there are |
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1010 // two _process_strong_tasks's in a G1CollectedHeap |
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1011 // so do it here too. |
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1012 _process_strong_tasks->set_n_threads(t); |
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1013 } |
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1014 |
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1015 // Set _n_par_threads according to a policy TBD. |
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1016 void set_par_threads(); |
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1017 |
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1018 void set_n_termination(int t) { |
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1019 _process_strong_tasks->set_n_threads(t); |
| 342 | 1020 } |
| 1021 | |
| 1022 virtual CollectedHeap::Name kind() const { | |
| 1023 return CollectedHeap::G1CollectedHeap; | |
| 1024 } | |
| 1025 | |
| 1026 // The current policy object for the collector. | |
| 1027 G1CollectorPolicy* g1_policy() const { return _g1_policy; } | |
| 1028 | |
| 1029 // Adaptive size policy. No such thing for g1. | |
| 1030 virtual AdaptiveSizePolicy* size_policy() { return NULL; } | |
| 1031 | |
| 1032 // The rem set and barrier set. | |
| 1033 G1RemSet* g1_rem_set() const { return _g1_rem_set; } | |
| 1034 ModRefBarrierSet* mr_bs() const { return _mr_bs; } | |
| 1035 | |
| 1036 // The rem set iterator. | |
| 1037 HeapRegionRemSetIterator* rem_set_iterator(int i) { | |
| 1038 return _rem_set_iterator[i]; | |
| 1039 } | |
| 1040 | |
| 1041 HeapRegionRemSetIterator* rem_set_iterator() { | |
| 1042 return _rem_set_iterator[0]; | |
| 1043 } | |
| 1044 | |
| 1045 unsigned get_gc_time_stamp() { | |
| 1046 return _gc_time_stamp; | |
| 1047 } | |
| 1048 | |
| 1049 void reset_gc_time_stamp() { | |
| 1050 _gc_time_stamp = 0; | |
|
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1051 OrderAccess::fence(); |
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1052 // Clear the cached CSet starting regions and time stamps. |
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1053 // Their validity is dependent on the GC timestamp. |
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1054 clear_cset_start_regions(); |
|
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1055 } |
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1056 |
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1057 void increment_gc_time_stamp() { |
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1058 ++_gc_time_stamp; |
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|
1059 OrderAccess::fence(); |
| 342 | 1060 } |
| 1061 | |
| 1705 | 1062 void iterate_dirty_card_closure(CardTableEntryClosure* cl, |
| 1063 DirtyCardQueue* into_cset_dcq, | |
| 1064 bool concurrent, int worker_i); | |
| 342 | 1065 |
| 1066 // The shared block offset table array. | |
| 1067 G1BlockOffsetSharedArray* bot_shared() const { return _bot_shared; } | |
| 1068 | |
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1069 // Reference Processing accessors |
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1070 |
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1071 // The STW reference processor.... |
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1072 ReferenceProcessor* ref_processor_stw() const { return _ref_processor_stw; } |
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1073 |
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1074 // The Concurent Marking reference processor... |
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1075 ReferenceProcessor* ref_processor_cm() const { return _ref_processor_cm; } |
| 342 | 1076 |
| 1077 virtual size_t capacity() const; | |
| 1078 virtual size_t used() const; | |
|
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1079 // This should be called when we're not holding the heap lock. The |
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1080 // result might be a bit inaccurate. |
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1081 size_t used_unlocked() const; |
| 342 | 1082 size_t recalculate_used() const; |
| 1083 | |
| 1084 // These virtual functions do the actual allocation. | |
| 1085 // Some heaps may offer a contiguous region for shared non-blocking | |
| 1086 // allocation, via inlined code (by exporting the address of the top and | |
| 1087 // end fields defining the extent of the contiguous allocation region.) | |
| 1088 // But G1CollectedHeap doesn't yet support this. | |
| 1089 | |
| 1090 // Return an estimate of the maximum allocation that could be performed | |
| 1091 // without triggering any collection or expansion activity. In a | |
| 1092 // generational collector, for example, this is probably the largest | |
| 1093 // allocation that could be supported (without expansion) in the youngest | |
| 1094 // generation. It is "unsafe" because no locks are taken; the result | |
| 1095 // should be treated as an approximation, not a guarantee, for use in | |
| 1096 // heuristic resizing decisions. | |
| 1097 virtual size_t unsafe_max_alloc(); | |
| 1098 | |
| 1099 virtual bool is_maximal_no_gc() const { | |
| 1100 return _g1_storage.uncommitted_size() == 0; | |
| 1101 } | |
| 1102 | |
| 1103 // The total number of regions in the heap. | |
| 3766 | 1104 size_t n_regions() { return _hrs.length(); } |
| 1105 | |
| 1106 // The max number of regions in the heap. | |
| 1107 size_t max_regions() { return _hrs.max_length(); } | |
| 342 | 1108 |
| 1109 // The number of regions that are completely free. | |
| 3766 | 1110 size_t free_regions() { return _free_list.length(); } |
| 342 | 1111 |
| 1112 // The number of regions that are not completely free. | |
| 1113 size_t used_regions() { return n_regions() - free_regions(); } | |
| 1114 | |
| 1115 // The number of regions available for "regular" expansion. | |
| 1116 size_t expansion_regions() { return _expansion_regions; } | |
| 1117 | |
| 3766 | 1118 // Factory method for HeapRegion instances. It will return NULL if |
| 1119 // the allocation fails. | |
| 1120 HeapRegion* new_heap_region(size_t hrs_index, HeapWord* bottom); | |
| 1121 | |
|
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1122 void verify_not_dirty_region(HeapRegion* hr) PRODUCT_RETURN; |
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1123 void verify_dirty_region(HeapRegion* hr) PRODUCT_RETURN; |
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1124 void verify_dirty_young_list(HeapRegion* head) PRODUCT_RETURN; |
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1125 void verify_dirty_young_regions() PRODUCT_RETURN; |
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1126 |
| 2152 | 1127 // verify_region_sets() performs verification over the region |
| 1128 // lists. It will be compiled in the product code to be used when | |
| 1129 // necessary (i.e., during heap verification). | |
| 1130 void verify_region_sets(); | |
| 342 | 1131 |
| 2152 | 1132 // verify_region_sets_optional() is planted in the code for |
| 1133 // list verification in non-product builds (and it can be enabled in | |
| 1134 // product builds by definning HEAP_REGION_SET_FORCE_VERIFY to be 1). | |
| 1135 #if HEAP_REGION_SET_FORCE_VERIFY | |
| 1136 void verify_region_sets_optional() { | |
| 1137 verify_region_sets(); | |
| 1138 } | |
| 1139 #else // HEAP_REGION_SET_FORCE_VERIFY | |
| 1140 void verify_region_sets_optional() { } | |
| 1141 #endif // HEAP_REGION_SET_FORCE_VERIFY | |
| 342 | 1142 |
| 2152 | 1143 #ifdef ASSERT |
| 2361 | 1144 bool is_on_master_free_list(HeapRegion* hr) { |
| 2152 | 1145 return hr->containing_set() == &_free_list; |
| 1146 } | |
| 342 | 1147 |
| 2361 | 1148 bool is_in_humongous_set(HeapRegion* hr) { |
| 2152 | 1149 return hr->containing_set() == &_humongous_set; |
| 2361 | 1150 } |
| 2152 | 1151 #endif // ASSERT |
| 342 | 1152 |
| 2152 | 1153 // Wrapper for the region list operations that can be called from |
| 1154 // methods outside this class. | |
| 342 | 1155 |
| 2152 | 1156 void secondary_free_list_add_as_tail(FreeRegionList* list) { |
| 1157 _secondary_free_list.add_as_tail(list); | |
| 1158 } | |
| 342 | 1159 |
| 2152 | 1160 void append_secondary_free_list() { |
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1161 _free_list.add_as_head(&_secondary_free_list); |
| 2152 | 1162 } |
| 342 | 1163 |
| 2361 | 1164 void append_secondary_free_list_if_not_empty_with_lock() { |
| 1165 // If the secondary free list looks empty there's no reason to | |
| 1166 // take the lock and then try to append it. | |
| 2152 | 1167 if (!_secondary_free_list.is_empty()) { |
| 1168 MutexLockerEx x(SecondaryFreeList_lock, Mutex::_no_safepoint_check_flag); | |
| 1169 append_secondary_free_list(); | |
| 1170 } | |
| 1171 } | |
| 342 | 1172 |
| 4072 | 1173 void old_set_remove(HeapRegion* hr) { |
| 1174 _old_set.remove(hr); | |
| 1175 } | |
| 1176 | |
|
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1177 size_t non_young_capacity_bytes() { |
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1178 return _old_set.total_capacity_bytes() + _humongous_set.total_capacity_bytes(); |
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1179 } |
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1180 |
| 2152 | 1181 void set_free_regions_coming(); |
| 1182 void reset_free_regions_coming(); | |
| 1183 bool free_regions_coming() { return _free_regions_coming; } | |
| 1184 void wait_while_free_regions_coming(); | |
| 342 | 1185 |
|
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1186 // Determine whether the given region is one that we are using as an |
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1187 // old GC alloc region. |
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1188 bool is_old_gc_alloc_region(HeapRegion* hr) { |
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1189 return hr == _retained_old_gc_alloc_region; |
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1190 } |
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1191 |
| 342 | 1192 // Perform a collection of the heap; intended for use in implementing |
| 1193 // "System.gc". This probably implies as full a collection as the | |
| 1194 // "CollectedHeap" supports. | |
| 1195 virtual void collect(GCCause::Cause cause); | |
| 1196 | |
| 1197 // The same as above but assume that the caller holds the Heap_lock. | |
| 1198 void collect_locked(GCCause::Cause cause); | |
| 1199 | |
| 1200 // This interface assumes that it's being called by the | |
| 1201 // vm thread. It collects the heap assuming that the | |
| 1202 // heap lock is already held and that we are executing in | |
| 1203 // the context of the vm thread. | |
| 1204 virtual void collect_as_vm_thread(GCCause::Cause cause); | |
| 1205 | |
| 1206 // True iff a evacuation has failed in the most-recent collection. | |
| 1207 bool evacuation_failed() { return _evacuation_failed; } | |
| 1208 | |
| 2152 | 1209 // It will free a region if it has allocated objects in it that are |
| 1210 // all dead. It calls either free_region() or | |
| 1211 // free_humongous_region() depending on the type of the region that | |
| 1212 // is passed to it. | |
| 2173 | 1213 void free_region_if_empty(HeapRegion* hr, |
| 1214 size_t* pre_used, | |
| 1215 FreeRegionList* free_list, | |
| 4072 | 1216 OldRegionSet* old_proxy_set, |
| 2173 | 1217 HumongousRegionSet* humongous_proxy_set, |
| 1218 HRRSCleanupTask* hrrs_cleanup_task, | |
| 1219 bool par); | |
| 342 | 1220 |
| 2152 | 1221 // It appends the free list to the master free list and updates the |
| 1222 // master humongous list according to the contents of the proxy | |
| 1223 // list. It also adjusts the total used bytes according to pre_used | |
| 1224 // (if par is true, it will do so by taking the ParGCRareEvent_lock). | |
| 1225 void update_sets_after_freeing_regions(size_t pre_used, | |
| 1226 FreeRegionList* free_list, | |
| 4072 | 1227 OldRegionSet* old_proxy_set, |
| 2152 | 1228 HumongousRegionSet* humongous_proxy_set, |
| 1229 bool par); | |
| 342 | 1230 |
| 4708 | 1231 // Returns "TRUE" iff "p" points into the committed areas of the heap. |
| 342 | 1232 virtual bool is_in(const void* p) const; |
| 1233 | |
| 1234 // Return "TRUE" iff the given object address is within the collection | |
| 1235 // set. | |
| 1236 inline bool obj_in_cs(oop obj); | |
| 1237 | |
| 1238 // Return "TRUE" iff the given object address is in the reserved | |
| 1239 // region of g1 (excluding the permanent generation). | |
| 1240 bool is_in_g1_reserved(const void* p) const { | |
| 1241 return _g1_reserved.contains(p); | |
| 1242 } | |
| 1243 | |
|
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1244 // Returns a MemRegion that corresponds to the space that has been |
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1245 // reserved for the heap |
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1246 MemRegion g1_reserved() { |
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1247 return _g1_reserved; |
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1248 } |
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1249 |
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1250 // Returns a MemRegion that corresponds to the space that has been |
| 342 | 1251 // committed in the heap |
| 1252 MemRegion g1_committed() { | |
| 1253 return _g1_committed; | |
| 1254 } | |
| 1255 | |
| 2311 | 1256 virtual bool is_in_closed_subset(const void* p) const; |
| 342 | 1257 |
| 1258 // This resets the card table to all zeros. It is used after | |
| 1259 // a collection pause which used the card table to claim cards. | |
| 1260 void cleanUpCardTable(); | |
| 1261 | |
| 1262 // Iteration functions. | |
| 1263 | |
| 1264 // Iterate over all the ref-containing fields of all objects, calling | |
| 1265 // "cl.do_oop" on each. | |
| 678 | 1266 virtual void oop_iterate(OopClosure* cl) { |
| 1267 oop_iterate(cl, true); | |
| 1268 } | |
| 1269 void oop_iterate(OopClosure* cl, bool do_perm); | |
| 342 | 1270 |
| 1271 // Same as above, restricted to a memory region. | |
| 678 | 1272 virtual void oop_iterate(MemRegion mr, OopClosure* cl) { |
| 1273 oop_iterate(mr, cl, true); | |
| 1274 } | |
| 1275 void oop_iterate(MemRegion mr, OopClosure* cl, bool do_perm); | |
| 342 | 1276 |
| 1277 // Iterate over all objects, calling "cl.do_object" on each. | |
| 678 | 1278 virtual void object_iterate(ObjectClosure* cl) { |
| 1279 object_iterate(cl, true); | |
| 1280 } | |
| 1281 virtual void safe_object_iterate(ObjectClosure* cl) { | |
| 1282 object_iterate(cl, true); | |
| 1283 } | |
| 1284 void object_iterate(ObjectClosure* cl, bool do_perm); | |
| 342 | 1285 |
| 1286 // Iterate over all objects allocated since the last collection, calling | |
| 1287 // "cl.do_object" on each. The heap must have been initialized properly | |
| 1288 // to support this function, or else this call will fail. | |
| 1289 virtual void object_iterate_since_last_GC(ObjectClosure* cl); | |
| 1290 | |
| 1291 // Iterate over all spaces in use in the heap, in ascending address order. | |
| 1292 virtual void space_iterate(SpaceClosure* cl); | |
| 1293 | |
| 1294 // Iterate over heap regions, in address order, terminating the | |
| 1295 // iteration early if the "doHeapRegion" method returns "true". | |
| 3766 | 1296 void heap_region_iterate(HeapRegionClosure* blk) const; |
| 342 | 1297 |
| 1298 // Iterate over heap regions starting with r (or the first region if "r" | |
| 1299 // is NULL), in address order, terminating early if the "doHeapRegion" | |
| 1300 // method returns "true". | |
| 3766 | 1301 void heap_region_iterate_from(HeapRegion* r, HeapRegionClosure* blk) const; |
| 342 | 1302 |
| 3766 | 1303 // Return the region with the given index. It assumes the index is valid. |
| 1304 HeapRegion* region_at(size_t index) const { return _hrs.at(index); } | |
| 342 | 1305 |
| 1306 // Divide the heap region sequence into "chunks" of some size (the number | |
| 1307 // of regions divided by the number of parallel threads times some | |
| 1308 // overpartition factor, currently 4). Assumes that this will be called | |
| 1309 // in parallel by ParallelGCThreads worker threads with discinct worker | |
| 1310 // ids in the range [0..max(ParallelGCThreads-1, 1)], that all parallel | |
| 1311 // calls will use the same "claim_value", and that that claim value is | |
| 1312 // different from the claim_value of any heap region before the start of | |
| 1313 // the iteration. Applies "blk->doHeapRegion" to each of the regions, by | |
| 1314 // attempting to claim the first region in each chunk, and, if | |
| 1315 // successful, applying the closure to each region in the chunk (and | |
| 1316 // setting the claim value of the second and subsequent regions of the | |
| 1317 // chunk.) For now requires that "doHeapRegion" always returns "false", | |
| 1318 // i.e., that a closure never attempt to abort a traversal. | |
| 1319 void heap_region_par_iterate_chunked(HeapRegionClosure* blk, | |
|
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1320 uint worker, |
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1321 uint no_of_par_workers, |
| 342 | 1322 jint claim_value); |
| 1323 | |
| 390 | 1324 // It resets all the region claim values to the default. |
| 1325 void reset_heap_region_claim_values(); | |
| 1326 | |
|
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1327 // Resets the claim values of regions in the current |
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1328 // collection set to the default. |
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1329 void reset_cset_heap_region_claim_values(); |
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1330 |
| 355 | 1331 #ifdef ASSERT |
| 1332 bool check_heap_region_claim_values(jint claim_value); | |
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1333 |
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1334 // Same as the routine above but only checks regions in the |
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1335 // current collection set. |
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1336 bool check_cset_heap_region_claim_values(jint claim_value); |
| 355 | 1337 #endif // ASSERT |
| 1338 | |
|
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1339 // Clear the cached cset start regions and (more importantly) |
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1340 // the time stamps. Called when we reset the GC time stamp. |
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1341 void clear_cset_start_regions(); |
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1342 |
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1343 // Given the id of a worker, obtain or calculate a suitable |
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1344 // starting region for iterating over the current collection set. |
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1345 HeapRegion* start_cset_region_for_worker(int worker_i); |
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1346 |
| 342 | 1347 // Iterate over the regions (if any) in the current collection set. |
| 1348 void collection_set_iterate(HeapRegionClosure* blk); | |
| 1349 | |
| 1350 // As above but starting from region r | |
| 1351 void collection_set_iterate_from(HeapRegion* r, HeapRegionClosure *blk); | |
| 1352 | |
| 1353 // Returns the first (lowest address) compactible space in the heap. | |
| 1354 virtual CompactibleSpace* first_compactible_space(); | |
| 1355 | |
| 1356 // A CollectedHeap will contain some number of spaces. This finds the | |
| 1357 // space containing a given address, or else returns NULL. | |
| 1358 virtual Space* space_containing(const void* addr) const; | |
| 1359 | |
| 1360 // A G1CollectedHeap will contain some number of heap regions. This | |
| 1361 // finds the region containing a given address, or else returns NULL. | |
| 3766 | 1362 template <class T> |
| 1363 inline HeapRegion* heap_region_containing(const T addr) const; | |
| 342 | 1364 |
| 1365 // Like the above, but requires "addr" to be in the heap (to avoid a | |
| 1366 // null-check), and unlike the above, may return an continuing humongous | |
| 1367 // region. | |
| 3766 | 1368 template <class T> |
| 1369 inline HeapRegion* heap_region_containing_raw(const T addr) const; | |
| 342 | 1370 |
| 1371 // A CollectedHeap is divided into a dense sequence of "blocks"; that is, | |
| 1372 // each address in the (reserved) heap is a member of exactly | |
| 1373 // one block. The defining characteristic of a block is that it is | |
| 1374 // possible to find its size, and thus to progress forward to the next | |
| 1375 // block. (Blocks may be of different sizes.) Thus, blocks may | |
| 1376 // represent Java objects, or they might be free blocks in a | |
| 1377 // free-list-based heap (or subheap), as long as the two kinds are | |
| 1378 // distinguishable and the size of each is determinable. | |
| 1379 | |
| 1380 // Returns the address of the start of the "block" that contains the | |
| 1381 // address "addr". We say "blocks" instead of "object" since some heaps | |
| 1382 // may not pack objects densely; a chunk may either be an object or a | |
| 1383 // non-object. | |
| 1384 virtual HeapWord* block_start(const void* addr) const; | |
| 1385 | |
| 1386 // Requires "addr" to be the start of a chunk, and returns its size. | |
| 1387 // "addr + size" is required to be the start of a new chunk, or the end | |
| 1388 // of the active area of the heap. | |
| 1389 virtual size_t block_size(const HeapWord* addr) const; | |
| 1390 | |
| 1391 // Requires "addr" to be the start of a block, and returns "TRUE" iff | |
| 1392 // the block is an object. | |
| 1393 virtual bool block_is_obj(const HeapWord* addr) const; | |
| 1394 | |
| 1395 // Does this heap support heap inspection? (+PrintClassHistogram) | |
| 1396 virtual bool supports_heap_inspection() const { return true; } | |
| 1397 | |
| 1398 // Section on thread-local allocation buffers (TLABs) | |
| 1399 // See CollectedHeap for semantics. | |
| 1400 | |
| 1401 virtual bool supports_tlab_allocation() const; | |
| 1402 virtual size_t tlab_capacity(Thread* thr) const; | |
| 1403 virtual size_t unsafe_max_tlab_alloc(Thread* thr) const; | |
| 1404 | |
| 1405 // Can a compiler initialize a new object without store barriers? | |
| 1406 // This permission only extends from the creation of a new object | |
|
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1407 // via a TLAB up to the first subsequent safepoint. If such permission |
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1408 // is granted for this heap type, the compiler promises to call |
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1409 // defer_store_barrier() below on any slow path allocation of |
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1410 // a new object for which such initializing store barriers will |
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1411 // have been elided. G1, like CMS, allows this, but should be |
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1412 // ready to provide a compensating write barrier as necessary |
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1413 // if that storage came out of a non-young region. The efficiency |
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1414 // of this implementation depends crucially on being able to |
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1415 // answer very efficiently in constant time whether a piece of |
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1416 // storage in the heap comes from a young region or not. |
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1417 // See ReduceInitialCardMarks. |
| 342 | 1418 virtual bool can_elide_tlab_store_barriers() const { |
|
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1419 return true; |
|
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1420 } |
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1421 |
| 1166 | 1422 virtual bool card_mark_must_follow_store() const { |
| 1423 return true; | |
| 1424 } | |
| 1425 | |
| 3766 | 1426 bool is_in_young(const oop obj) { |
|
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1427 HeapRegion* hr = heap_region_containing(obj); |
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1428 return hr != NULL && hr->is_young(); |
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1429 } |
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1430 |
|
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1431 #ifdef ASSERT |
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1432 virtual bool is_in_partial_collection(const void* p); |
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1433 #endif |
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1434 |
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1435 virtual bool is_scavengable(const void* addr); |
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1436 |
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1437 // We don't need barriers for initializing stores to objects |
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1438 // in the young gen: for the SATB pre-barrier, there is no |
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1439 // pre-value that needs to be remembered; for the remembered-set |
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1440 // update logging post-barrier, we don't maintain remembered set |
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1441 // information for young gen objects. |
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1442 virtual bool can_elide_initializing_store_barrier(oop new_obj) { |
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1443 return is_in_young(new_obj); |
| 342 | 1444 } |
| 1445 | |
| 1446 // Can a compiler elide a store barrier when it writes | |
| 1447 // a permanent oop into the heap? Applies when the compiler | |
| 1448 // is storing x to the heap, where x->is_perm() is true. | |
| 1449 virtual bool can_elide_permanent_oop_store_barriers() const { | |
| 1450 // At least until perm gen collection is also G1-ified, at | |
| 1451 // which point this should return false. | |
| 1452 return true; | |
| 1453 } | |
| 1454 | |
| 1455 // Returns "true" iff the given word_size is "very large". | |
| 1456 static bool isHumongous(size_t word_size) { | |
|
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1457 // Note this has to be strictly greater-than as the TLABs |
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1458 // are capped at the humongous thresold and we want to |
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1459 // ensure that we don't try to allocate a TLAB as |
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1460 // humongous and that we don't allocate a humongous |
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1461 // object in a TLAB. |
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1462 return word_size > _humongous_object_threshold_in_words; |
| 342 | 1463 } |
| 1464 | |
| 1465 // Update mod union table with the set of dirty cards. | |
| 1466 void updateModUnion(); | |
| 1467 | |
| 1468 // Set the mod union bits corresponding to the given memRegion. Note | |
| 1469 // that this is always a safe operation, since it doesn't clear any | |
| 1470 // bits. | |
| 1471 void markModUnionRange(MemRegion mr); | |
| 1472 | |
| 1473 // Records the fact that a marking phase is no longer in progress. | |
| 1474 void set_marking_complete() { | |
| 1475 _mark_in_progress = false; | |
| 1476 } | |
| 1477 void set_marking_started() { | |
| 1478 _mark_in_progress = true; | |
| 1479 } | |
| 1480 bool mark_in_progress() { | |
| 1481 return _mark_in_progress; | |
| 1482 } | |
| 1483 | |
| 1484 // Print the maximum heap capacity. | |
| 1485 virtual size_t max_capacity() const; | |
| 1486 | |
| 1487 virtual jlong millis_since_last_gc(); | |
| 1488 | |
| 1489 // Perform any cleanup actions necessary before allowing a verification. | |
| 1490 virtual void prepare_for_verify(); | |
| 1491 | |
| 1492 // Perform verification. | |
| 811 | 1493 |
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1494 // vo == UsePrevMarking -> use "prev" marking information, |
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1495 // vo == UseNextMarking -> use "next" marking information |
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1496 // vo == UseMarkWord -> use the mark word in the object header |
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1497 // |
| 811 | 1498 // NOTE: Only the "prev" marking information is guaranteed to be |
| 1499 // consistent most of the time, so most calls to this should use | |
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1500 // vo == UsePrevMarking. |
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1501 // Currently, there is only one case where this is called with |
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1502 // vo == UseNextMarking, which is to verify the "next" marking |
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1503 // information at the end of remark. |
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1504 // Currently there is only one place where this is called with |
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1505 // vo == UseMarkWord, which is to verify the marking during a |
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1506 // full GC. |
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1507 void verify(bool allow_dirty, bool silent, VerifyOption vo); |
| 811 | 1508 |
| 1509 // Override; it uses the "prev" marking information | |
| 342 | 1510 virtual void verify(bool allow_dirty, bool silent); |
| 1511 virtual void print_on(outputStream* st) const; | |
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1512 virtual void print_extended_on(outputStream* st) const; |
| 342 | 1513 |
| 1514 virtual void print_gc_threads_on(outputStream* st) const; | |
| 1515 virtual void gc_threads_do(ThreadClosure* tc) const; | |
| 1516 | |
| 1517 // Override | |
| 1518 void print_tracing_info() const; | |
| 1519 | |
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1520 // The following two methods are helpful for debugging RSet issues. |
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1521 void print_cset_rsets() PRODUCT_RETURN; |
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1522 void print_all_rsets() PRODUCT_RETURN; |
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1523 |
| 342 | 1524 // Convenience function to be used in situations where the heap type can be |
| 1525 // asserted to be this type. | |
| 1526 static G1CollectedHeap* heap(); | |
| 1527 | |
| 1528 void set_region_short_lived_locked(HeapRegion* hr); | |
| 1529 // add appropriate methods for any other surv rate groups | |
| 1530 | |
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1531 YoungList* young_list() { return _young_list; } |
| 342 | 1532 |
| 1533 // debugging | |
| 1534 bool check_young_list_well_formed() { | |
| 1535 return _young_list->check_list_well_formed(); | |
| 1536 } | |
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1537 |
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1538 bool check_young_list_empty(bool check_heap, |
| 342 | 1539 bool check_sample = true); |
| 1540 | |
| 1541 // *** Stuff related to concurrent marking. It's not clear to me that so | |
| 1542 // many of these need to be public. | |
| 1543 | |
| 1544 // The functions below are helper functions that a subclass of | |
| 1545 // "CollectedHeap" can use in the implementation of its virtual | |
| 1546 // functions. | |
| 1547 // This performs a concurrent marking of the live objects in a | |
| 1548 // bitmap off to the side. | |
| 1549 void doConcurrentMark(); | |
| 1550 | |
| 1551 bool isMarkedPrev(oop obj) const; | |
| 1552 bool isMarkedNext(oop obj) const; | |
| 1553 | |
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1554 // vo == UsePrevMarking -> use "prev" marking information, |
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1555 // vo == UseNextMarking -> use "next" marking information, |
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1556 // vo == UseMarkWord -> use mark word from object header |
| 811 | 1557 bool is_obj_dead_cond(const oop obj, |
| 1558 const HeapRegion* hr, | |
|
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1559 const VerifyOption vo) const { |
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1560 |
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1561 switch (vo) { |
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1562 case VerifyOption_G1UsePrevMarking: |
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1563 return is_obj_dead(obj, hr); |
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1564 case VerifyOption_G1UseNextMarking: |
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1565 return is_obj_ill(obj, hr); |
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|
1566 default: |
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1567 assert(vo == VerifyOption_G1UseMarkWord, "must be"); |
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1568 return !obj->is_gc_marked(); |
| 811 | 1569 } |
| 1570 } | |
| 1571 | |
| 342 | 1572 // Determine if an object is dead, given the object and also |
| 1573 // the region to which the object belongs. An object is dead | |
| 1574 // iff a) it was not allocated since the last mark and b) it | |
| 1575 // is not marked. | |
| 1576 | |
| 1577 bool is_obj_dead(const oop obj, const HeapRegion* hr) const { | |
| 1578 return | |
| 1579 !hr->obj_allocated_since_prev_marking(obj) && | |
| 1580 !isMarkedPrev(obj); | |
| 1581 } | |
| 1582 | |
| 1583 // This is used when copying an object to survivor space. | |
| 1584 // If the object is marked live, then we mark the copy live. | |
| 1585 // If the object is allocated since the start of this mark | |
| 1586 // cycle, then we mark the copy live. | |
| 1587 // If the object has been around since the previous mark | |
| 1588 // phase, and hasn't been marked yet during this phase, | |
| 1589 // then we don't mark it, we just wait for the | |
| 1590 // current marking cycle to get to it. | |
| 1591 | |
| 1592 // This function returns true when an object has been | |
| 1593 // around since the previous marking and hasn't yet | |
| 1594 // been marked during this marking. | |
| 1595 | |
| 1596 bool is_obj_ill(const oop obj, const HeapRegion* hr) const { | |
| 1597 return | |
| 1598 !hr->obj_allocated_since_next_marking(obj) && | |
| 1599 !isMarkedNext(obj); | |
| 1600 } | |
| 1601 | |
| 1602 // Determine if an object is dead, given only the object itself. | |
| 1603 // This will find the region to which the object belongs and | |
| 1604 // then call the region version of the same function. | |
| 1605 | |
| 1606 // Added if it is in permanent gen it isn't dead. | |
| 1607 // Added if it is NULL it isn't dead. | |
| 1608 | |
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1609 // vo == UsePrevMarking -> use "prev" marking information, |
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1610 // vo == UseNextMarking -> use "next" marking information, |
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1611 // vo == UseMarkWord -> use mark word from object header |
| 811 | 1612 bool is_obj_dead_cond(const oop obj, |
|
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1613 const VerifyOption vo) const { |
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|
1614 |
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1615 switch (vo) { |
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|
1616 case VerifyOption_G1UsePrevMarking: |
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1617 return is_obj_dead(obj); |
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1618 case VerifyOption_G1UseNextMarking: |
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1619 return is_obj_ill(obj); |
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|
1620 default: |
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|
1621 assert(vo == VerifyOption_G1UseMarkWord, "must be"); |
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|
1622 return !obj->is_gc_marked(); |
| 811 | 1623 } |
| 1624 } | |
| 1625 | |
|
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|
1626 bool is_obj_dead(const oop obj) const { |
| 811 | 1627 const HeapRegion* hr = heap_region_containing(obj); |
| 342 | 1628 if (hr == NULL) { |
| 1629 if (Universe::heap()->is_in_permanent(obj)) | |
| 1630 return false; | |
| 1631 else if (obj == NULL) return false; | |
| 1632 else return true; | |
| 1633 } | |
| 1634 else return is_obj_dead(obj, hr); | |
| 1635 } | |
| 1636 | |
|
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1637 bool is_obj_ill(const oop obj) const { |
| 811 | 1638 const HeapRegion* hr = heap_region_containing(obj); |
| 342 | 1639 if (hr == NULL) { |
| 1640 if (Universe::heap()->is_in_permanent(obj)) | |
| 1641 return false; | |
| 1642 else if (obj == NULL) return false; | |
| 1643 else return true; | |
| 1644 } | |
| 1645 else return is_obj_ill(obj, hr); | |
| 1646 } | |
| 1647 | |
| 1648 // The following is just to alert the verification code | |
| 1649 // that a full collection has occurred and that the | |
| 1650 // remembered sets are no longer up to date. | |
| 1651 bool _full_collection; | |
| 1652 void set_full_collection() { _full_collection = true;} | |
| 1653 void clear_full_collection() {_full_collection = false;} | |
| 1654 bool full_collection() {return _full_collection;} | |
| 1655 | |
| 1656 ConcurrentMark* concurrent_mark() const { return _cm; } | |
| 1657 ConcurrentG1Refine* concurrent_g1_refine() const { return _cg1r; } | |
| 1658 | |
|
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1659 // The dirty cards region list is used to record a subset of regions |
|
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|
1660 // whose cards need clearing. The list if populated during the |
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|
1661 // remembered set scanning and drained during the card table |
|
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1662 // cleanup. Although the methods are reentrant, population/draining |
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1663 // phases must not overlap. For synchronization purposes the last |
|
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1664 // element on the list points to itself. |
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|
1665 HeapRegion* _dirty_cards_region_list; |
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1666 void push_dirty_cards_region(HeapRegion* hr); |
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1667 HeapRegion* pop_dirty_cards_region(); |
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|
1668 |
| 342 | 1669 public: |
| 1670 void stop_conc_gc_threads(); | |
| 1671 | |
| 1672 size_t pending_card_num(); | |
| 1673 size_t max_pending_card_num(); | |
| 1674 size_t cards_scanned(); | |
| 1675 | |
| 1676 protected: | |
| 1677 size_t _max_heap_capacity; | |
| 1678 }; | |
| 1679 | |
|
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1680 class G1ParGCAllocBuffer: public ParGCAllocBuffer { |
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1681 private: |
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|
1682 bool _retired; |
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1683 |
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1684 public: |
|
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1685 G1ParGCAllocBuffer(size_t gclab_word_size); |
|
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1686 |
|
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1687 void set_buf(HeapWord* buf) { |
|
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|
1688 ParGCAllocBuffer::set_buf(buf); |
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|
1689 _retired = false; |
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|
1690 } |
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|
1691 |
|
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|
1692 void retire(bool end_of_gc, bool retain) { |
|
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|
1693 if (_retired) |
|
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|
1694 return; |
|
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|
1695 ParGCAllocBuffer::retire(end_of_gc, retain); |
|
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|
1696 _retired = true; |
|
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|
1697 } |
|
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|
1698 }; |
|
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|
1699 |
|
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|
1700 class G1ParScanThreadState : public StackObj { |
|
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|
1701 protected: |
|
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|
1702 G1CollectedHeap* _g1h; |
|
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|
1703 RefToScanQueue* _refs; |
|
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|
1704 DirtyCardQueue _dcq; |
|
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|
1705 CardTableModRefBS* _ct_bs; |
|
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|
1706 G1RemSet* _g1_rem; |
|
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|
1707 |
|
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|
1708 G1ParGCAllocBuffer _surviving_alloc_buffer; |
|
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|
1709 G1ParGCAllocBuffer _tenured_alloc_buffer; |
|
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|
1710 G1ParGCAllocBuffer* _alloc_buffers[GCAllocPurposeCount]; |
|
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|
1711 ageTable _age_table; |
|
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|
1712 |
|
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|
1713 size_t _alloc_buffer_waste; |
|
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|
1714 size_t _undo_waste; |
|
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|
1715 |
|
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|
1716 OopsInHeapRegionClosure* _evac_failure_cl; |
|
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|
1717 G1ParScanHeapEvacClosure* _evac_cl; |
|
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|
1718 G1ParScanPartialArrayClosure* _partial_scan_cl; |
|
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|
1719 |
|
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|
1720 int _hash_seed; |
|
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|
1721 uint _queue_num; |
|
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1722 |
| 1611 | 1723 size_t _term_attempts; |
|
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|
1724 |
|
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|
1725 double _start; |
|
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|
1726 double _start_strong_roots; |
|
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|
1727 double _strong_roots_time; |
|
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|
1728 double _start_term; |
|
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|
1729 double _term_time; |
|
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|
1730 |
|
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|
1731 // Map from young-age-index (0 == not young, 1 is youngest) to |
|
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|
1732 // surviving words. base is what we get back from the malloc call |
|
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|
1733 size_t* _surviving_young_words_base; |
|
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|
1734 // this points into the array, as we use the first few entries for padding |
|
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|
1735 size_t* _surviving_young_words; |
|
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|
1736 |
| 1709 | 1737 #define PADDING_ELEM_NUM (DEFAULT_CACHE_LINE_SIZE / sizeof(size_t)) |
|
845
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|
1738 |
|
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|
1739 void add_to_alloc_buffer_waste(size_t waste) { _alloc_buffer_waste += waste; } |
|
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|
1740 |
|
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|
1741 void add_to_undo_waste(size_t waste) { _undo_waste += waste; } |
|
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|
1742 |
|
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|
1743 DirtyCardQueue& dirty_card_queue() { return _dcq; } |
|
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|
1744 CardTableModRefBS* ctbs() { return _ct_bs; } |
|
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|
1745 |
|
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|
1746 template <class T> void immediate_rs_update(HeapRegion* from, T* p, int tid) { |
|
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|
1747 if (!from->is_survivor()) { |
|
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|
1748 _g1_rem->par_write_ref(from, p, tid); |
|
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|
1749 } |
|
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|
1750 } |
|
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|
1751 |
|
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|
1752 template <class T> void deferred_rs_update(HeapRegion* from, T* p, int tid) { |
|
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|
1753 // If the new value of the field points to the same region or |
|
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|
1754 // is the to-space, we don't need to include it in the Rset updates. |
|
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|
1755 if (!from->is_in_reserved(oopDesc::load_decode_heap_oop(p)) && !from->is_survivor()) { |
|
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|
1756 size_t card_index = ctbs()->index_for(p); |
|
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|
1757 // If the card hasn't been added to the buffer, do it. |
|
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|
1758 if (ctbs()->mark_card_deferred(card_index)) { |
|
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|
1759 dirty_card_queue().enqueue((jbyte*)ctbs()->byte_for_index(card_index)); |
|
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|
1760 } |
|
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|
1761 } |
|
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|
1762 } |
|
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|
1763 |
|
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|
1764 public: |
|
4836
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|
1765 G1ParScanThreadState(G1CollectedHeap* g1h, uint queue_num); |
|
845
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|
1766 |
|
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|
1767 ~G1ParScanThreadState() { |
|
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|
1768 FREE_C_HEAP_ARRAY(size_t, _surviving_young_words_base); |
|
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|
1769 } |
|
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|
1770 |
|
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|
1771 RefToScanQueue* refs() { return _refs; } |
|
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|
1772 ageTable* age_table() { return &_age_table; } |
|
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|
1773 |
|
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|
1774 G1ParGCAllocBuffer* alloc_buffer(GCAllocPurpose purpose) { |
|
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|
1775 return _alloc_buffers[purpose]; |
|
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|
1776 } |
|
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|
1777 |
| 1709 | 1778 size_t alloc_buffer_waste() const { return _alloc_buffer_waste; } |
| 1779 size_t undo_waste() const { return _undo_waste; } | |
|
845
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|
1780 |
|
1862
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|
1781 #ifdef ASSERT |
|
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|
1782 bool verify_ref(narrowOop* ref) const; |
|
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|
1783 bool verify_ref(oop* ref) const; |
|
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|
1784 bool verify_task(StarTask ref) const; |
|
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|
1785 #endif // ASSERT |
|
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|
1786 |
|
845
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|
1787 template <class T> void push_on_queue(T* ref) { |
|
1862
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|
1788 assert(verify_ref(ref), "sanity"); |
| 1709 | 1789 refs()->push(ref); |
|
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|
1790 } |
|
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|
1791 |
|
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|
1792 template <class T> void update_rs(HeapRegion* from, T* p, int tid) { |
|
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|
1793 if (G1DeferredRSUpdate) { |
|
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|
1794 deferred_rs_update(from, p, tid); |
|
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|
1795 } else { |
|
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|
1796 immediate_rs_update(from, p, tid); |
|
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|
1797 } |
|
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|
1798 } |
|
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|
1799 |
|
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|
1800 HeapWord* allocate_slow(GCAllocPurpose purpose, size_t word_sz) { |
|
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|
1801 |
|
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|
1802 HeapWord* obj = NULL; |
|
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|
1803 size_t gclab_word_size = _g1h->desired_plab_sz(purpose); |
|
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|
1804 if (word_sz * 100 < gclab_word_size * ParallelGCBufferWastePct) { |
|
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|
1805 G1ParGCAllocBuffer* alloc_buf = alloc_buffer(purpose); |
|
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|
1806 assert(gclab_word_size == alloc_buf->word_sz(), |
|
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|
1807 "dynamic resizing is not supported"); |
|
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|
1808 add_to_alloc_buffer_waste(alloc_buf->words_remaining()); |
|
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|
1809 alloc_buf->retire(false, false); |
|
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|
1810 |
|
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|
1811 HeapWord* buf = _g1h->par_allocate_during_gc(purpose, gclab_word_size); |
|
845
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|
1812 if (buf == NULL) return NULL; // Let caller handle allocation failure. |
|
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|
1813 // Otherwise. |
|
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1814 alloc_buf->set_buf(buf); |
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1815 |
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1816 obj = alloc_buf->allocate(word_sz); |
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1817 assert(obj != NULL, "buffer was definitely big enough..."); |
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1818 } else { |
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1819 obj = _g1h->par_allocate_during_gc(purpose, word_sz); |
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1820 } |
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1821 return obj; |
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1822 } |
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1823 |
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1824 HeapWord* allocate(GCAllocPurpose purpose, size_t word_sz) { |
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1825 HeapWord* obj = alloc_buffer(purpose)->allocate(word_sz); |
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1826 if (obj != NULL) return obj; |
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1827 return allocate_slow(purpose, word_sz); |
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1828 } |
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1829 |
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1830 void undo_allocation(GCAllocPurpose purpose, HeapWord* obj, size_t word_sz) { |
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1831 if (alloc_buffer(purpose)->contains(obj)) { |
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1832 assert(alloc_buffer(purpose)->contains(obj + word_sz - 1), |
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1833 "should contain whole object"); |
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1834 alloc_buffer(purpose)->undo_allocation(obj, word_sz); |
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1835 } else { |
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1836 CollectedHeap::fill_with_object(obj, word_sz); |
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1837 add_to_undo_waste(word_sz); |
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1838 } |
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1839 } |
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1840 |
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1841 void set_evac_failure_closure(OopsInHeapRegionClosure* evac_failure_cl) { |
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1842 _evac_failure_cl = evac_failure_cl; |
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1843 } |
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1844 OopsInHeapRegionClosure* evac_failure_closure() { |
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1845 return _evac_failure_cl; |
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1846 } |
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1847 |
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1848 void set_evac_closure(G1ParScanHeapEvacClosure* evac_cl) { |
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1849 _evac_cl = evac_cl; |
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1850 } |
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1851 |
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1852 void set_partial_scan_closure(G1ParScanPartialArrayClosure* partial_scan_cl) { |
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1853 _partial_scan_cl = partial_scan_cl; |
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1854 } |
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1855 |
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1856 int* hash_seed() { return &_hash_seed; } |
|
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1857 uint queue_num() { return _queue_num; } |
|
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1858 |
| 1709 | 1859 size_t term_attempts() const { return _term_attempts; } |
| 1611 | 1860 void note_term_attempt() { _term_attempts++; } |
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1861 |
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1862 void start_strong_roots() { |
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1863 _start_strong_roots = os::elapsedTime(); |
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1864 } |
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1865 void end_strong_roots() { |
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1866 _strong_roots_time += (os::elapsedTime() - _start_strong_roots); |
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1867 } |
| 1709 | 1868 double strong_roots_time() const { return _strong_roots_time; } |
|
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1869 |
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1870 void start_term_time() { |
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1871 note_term_attempt(); |
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1872 _start_term = os::elapsedTime(); |
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1873 } |
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1874 void end_term_time() { |
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1875 _term_time += (os::elapsedTime() - _start_term); |
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1876 } |
| 1709 | 1877 double term_time() const { return _term_time; } |
|
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1878 |
| 1709 | 1879 double elapsed_time() const { |
|
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1880 return os::elapsedTime() - _start; |
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1881 } |
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1882 |
| 1709 | 1883 static void |
| 1884 print_termination_stats_hdr(outputStream* const st = gclog_or_tty); | |
| 1885 void | |
| 1886 print_termination_stats(int i, outputStream* const st = gclog_or_tty) const; | |
| 1887 | |
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1888 size_t* surviving_young_words() { |
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1889 // We add on to hide entry 0 which accumulates surviving words for |
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1890 // age -1 regions (i.e. non-young ones) |
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1891 return _surviving_young_words; |
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1892 } |
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1893 |
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1894 void retire_alloc_buffers() { |
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1895 for (int ap = 0; ap < GCAllocPurposeCount; ++ap) { |
|
1391
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1896 size_t waste = _alloc_buffers[ap]->words_remaining(); |
|
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1897 add_to_alloc_buffer_waste(waste); |
|
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1898 _alloc_buffers[ap]->retire(true, false); |
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1899 } |
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1900 } |
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1901 |
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1902 template <class T> void deal_with_reference(T* ref_to_scan) { |
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1903 if (has_partial_array_mask(ref_to_scan)) { |
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1904 _partial_scan_cl->do_oop_nv(ref_to_scan); |
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1905 } else { |
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1906 // Note: we can use "raw" versions of "region_containing" because |
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1907 // "obj_to_scan" is definitely in the heap, and is not in a |
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1908 // humongous region. |
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1909 HeapRegion* r = _g1h->heap_region_containing_raw(ref_to_scan); |
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1910 _evac_cl->set_region(r); |
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1911 _evac_cl->do_oop_nv(ref_to_scan); |
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1912 } |
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1913 } |
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1914 |
|
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1915 void deal_with_reference(StarTask ref) { |
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1916 assert(verify_task(ref), "sanity"); |
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1917 if (ref.is_narrow()) { |
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1918 deal_with_reference((narrowOop*)ref); |
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1919 } else { |
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1920 deal_with_reference((oop*)ref); |
|
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1921 } |
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1922 } |
|
1862
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1923 |
|
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1924 public: |
|
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1925 void trim_queue(); |
|
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1926 }; |
| 1972 | 1927 |
| 1928 #endif // SHARE_VM_GC_IMPLEMENTATION_G1_G1COLLECTEDHEAP_HPP |