Mercurial > hg > truffle
annotate src/share/vm/gc_implementation/g1/g1CollectedHeap.hpp @ 20417:d35872270666
8057658: Enable G1 FullGC extensions
Summary: Refactored the G1 FullGC code to enable it to be extended.
Reviewed-by: mgerdin, brutisso
| author | sjohanss |
|---|---|
| date | Tue, 09 Sep 2014 00:05:25 +0200 |
| parents | 227a9e5e4b4a |
| children | e5668dcf12e9 |
| rev | line source |
|---|---|
| 342 | 1 /* |
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2 * Copyright (c) 2001, 2014, Oracle and/or its affiliates. All rights reserved. |
| 342 | 3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
| 4 * | |
| 5 * This code is free software; you can redistribute it and/or modify it | |
| 6 * under the terms of the GNU General Public License version 2 only, as | |
| 7 * published by the Free Software Foundation. | |
| 8 * | |
| 9 * This code is distributed in the hope that it will be useful, but WITHOUT | |
| 10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or | |
| 11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License | |
| 12 * version 2 for more details (a copy is included in the LICENSE file that | |
| 13 * accompanied this code). | |
| 14 * | |
| 15 * You should have received a copy of the GNU General Public License version | |
| 16 * 2 along with this work; if not, write to the Free Software Foundation, | |
| 17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. | |
| 18 * | |
|
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19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
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20 * or visit www.oracle.com if you need additional information or have any |
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21 * questions. |
| 342 | 22 * |
| 23 */ | |
| 24 | |
| 1972 | 25 #ifndef SHARE_VM_GC_IMPLEMENTATION_G1_G1COLLECTEDHEAP_HPP |
| 26 #define SHARE_VM_GC_IMPLEMENTATION_G1_G1COLLECTEDHEAP_HPP | |
| 27 | |
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28 #include "gc_implementation/g1/g1AllocationContext.hpp" |
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29 #include "gc_implementation/g1/g1Allocator.hpp" |
| 1972 | 30 #include "gc_implementation/g1/concurrentMark.hpp" |
| 10405 | 31 #include "gc_implementation/g1/evacuationInfo.hpp" |
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32 #include "gc_implementation/g1/g1AllocRegion.hpp" |
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33 #include "gc_implementation/g1/g1BiasedArray.hpp" |
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34 #include "gc_implementation/g1/g1HRPrinter.hpp" |
| 10405 | 35 #include "gc_implementation/g1/g1MonitoringSupport.hpp" |
| 12343 | 36 #include "gc_implementation/g1/g1SATBCardTableModRefBS.hpp" |
| 10405 | 37 #include "gc_implementation/g1/g1YCTypes.hpp" |
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38 #include "gc_implementation/g1/heapRegionManager.hpp" |
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39 #include "gc_implementation/g1/heapRegionSet.hpp" |
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40 #include "gc_implementation/shared/hSpaceCounters.hpp" |
| 6595 | 41 #include "gc_implementation/shared/parGCAllocBuffer.hpp" |
| 1972 | 42 #include "memory/barrierSet.hpp" |
| 43 #include "memory/memRegion.hpp" | |
| 44 #include "memory/sharedHeap.hpp" | |
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45 #include "utilities/stack.hpp" |
| 1972 | 46 |
| 342 | 47 // A "G1CollectedHeap" is an implementation of a java heap for HotSpot. |
| 48 // It uses the "Garbage First" heap organization and algorithm, which | |
| 49 // may combine concurrent marking with parallel, incremental compaction of | |
| 50 // heap subsets that will yield large amounts of garbage. | |
| 51 | |
| 12080 | 52 // Forward declarations |
| 342 | 53 class HeapRegion; |
| 2173 | 54 class HRRSCleanupTask; |
| 342 | 55 class GenerationSpec; |
| 56 class OopsInHeapRegionClosure; | |
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57 class G1KlassScanClosure; |
| 342 | 58 class G1ScanHeapEvacClosure; |
| 59 class ObjectClosure; | |
| 60 class SpaceClosure; | |
| 61 class CompactibleSpaceClosure; | |
| 62 class Space; | |
| 63 class G1CollectorPolicy; | |
| 64 class GenRemSet; | |
| 65 class G1RemSet; | |
| 66 class HeapRegionRemSetIterator; | |
| 67 class ConcurrentMark; | |
| 68 class ConcurrentMarkThread; | |
| 69 class ConcurrentG1Refine; | |
| 10405 | 70 class ConcurrentGCTimer; |
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71 class GenerationCounters; |
| 10405 | 72 class STWGCTimer; |
| 73 class G1NewTracer; | |
| 74 class G1OldTracer; | |
| 75 class EvacuationFailedInfo; | |
| 12080 | 76 class nmethod; |
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77 class Ticks; |
| 342 | 78 |
| 6197 | 79 typedef OverflowTaskQueue<StarTask, mtGC> RefToScanQueue; |
| 80 typedef GenericTaskQueueSet<RefToScanQueue, mtGC> RefToScanQueueSet; | |
| 342 | 81 |
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82 typedef int RegionIdx_t; // needs to hold [ 0..max_regions() ) |
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83 typedef int CardIdx_t; // needs to hold [ 0..CardsPerRegion ) |
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84 |
| 6197 | 85 class YoungList : public CHeapObj<mtGC> { |
| 342 | 86 private: |
| 87 G1CollectedHeap* _g1h; | |
| 88 | |
| 89 HeapRegion* _head; | |
| 90 | |
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91 HeapRegion* _survivor_head; |
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92 HeapRegion* _survivor_tail; |
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93 |
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94 HeapRegion* _curr; |
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95 |
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96 uint _length; |
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97 uint _survivor_length; |
| 342 | 98 |
| 99 size_t _last_sampled_rs_lengths; | |
| 100 size_t _sampled_rs_lengths; | |
| 101 | |
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102 void empty_list(HeapRegion* list); |
| 342 | 103 |
| 104 public: | |
| 105 YoungList(G1CollectedHeap* g1h); | |
| 106 | |
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107 void push_region(HeapRegion* hr); |
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108 void add_survivor_region(HeapRegion* hr); |
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109 |
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110 void empty_list(); |
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111 bool is_empty() { return _length == 0; } |
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112 uint length() { return _length; } |
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113 uint survivor_length() { return _survivor_length; } |
| 342 | 114 |
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115 // Currently we do not keep track of the used byte sum for the |
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116 // young list and the survivors and it'd be quite a lot of work to |
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117 // do so. When we'll eventually replace the young list with |
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118 // instances of HeapRegionLinkedList we'll get that for free. So, |
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119 // we'll report the more accurate information then. |
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120 size_t eden_used_bytes() { |
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121 assert(length() >= survivor_length(), "invariant"); |
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122 return (size_t) (length() - survivor_length()) * HeapRegion::GrainBytes; |
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123 } |
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124 size_t survivor_used_bytes() { |
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125 return (size_t) survivor_length() * HeapRegion::GrainBytes; |
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126 } |
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127 |
| 342 | 128 void rs_length_sampling_init(); |
| 129 bool rs_length_sampling_more(); | |
| 130 void rs_length_sampling_next(); | |
| 131 | |
| 132 void reset_sampled_info() { | |
| 133 _last_sampled_rs_lengths = 0; | |
| 134 } | |
| 135 size_t sampled_rs_lengths() { return _last_sampled_rs_lengths; } | |
| 136 | |
| 137 // for development purposes | |
| 138 void reset_auxilary_lists(); | |
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139 void clear() { _head = NULL; _length = 0; } |
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140 |
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141 void clear_survivors() { |
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142 _survivor_head = NULL; |
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143 _survivor_tail = NULL; |
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144 _survivor_length = 0; |
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145 } |
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146 |
| 342 | 147 HeapRegion* first_region() { return _head; } |
| 148 HeapRegion* first_survivor_region() { return _survivor_head; } | |
| 545 | 149 HeapRegion* last_survivor_region() { return _survivor_tail; } |
| 342 | 150 |
| 151 // debugging | |
| 152 bool check_list_well_formed(); | |
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153 bool check_list_empty(bool check_sample = true); |
| 342 | 154 void print(); |
| 155 }; | |
| 156 | |
| 12080 | 157 // The G1 STW is alive closure. |
| 158 // An instance is embedded into the G1CH and used as the | |
| 159 // (optional) _is_alive_non_header closure in the STW | |
| 160 // reference processor. It is also extensively used during | |
| 161 // reference processing during STW evacuation pauses. | |
| 162 class G1STWIsAliveClosure: public BoolObjectClosure { | |
| 163 G1CollectedHeap* _g1; | |
| 164 public: | |
| 165 G1STWIsAliveClosure(G1CollectedHeap* g1) : _g1(g1) {} | |
| 166 bool do_object_b(oop p); | |
| 167 }; | |
| 168 | |
| 342 | 169 class RefineCardTableEntryClosure; |
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170 |
| 20337 | 171 class G1RegionMappingChangedListener : public G1MappingChangedListener { |
| 172 private: | |
| 173 void reset_from_card_cache(uint start_idx, size_t num_regions); | |
| 174 public: | |
| 175 virtual void on_commit(uint start_idx, size_t num_regions); | |
| 176 }; | |
| 177 | |
| 342 | 178 class G1CollectedHeap : public SharedHeap { |
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179 friend class VM_CollectForMetadataAllocation; |
| 342 | 180 friend class VM_G1CollectForAllocation; |
| 181 friend class VM_G1CollectFull; | |
| 182 friend class VM_G1IncCollectionPause; | |
| 183 friend class VMStructs; | |
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184 friend class MutatorAllocRegion; |
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185 friend class SurvivorGCAllocRegion; |
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186 friend class OldGCAllocRegion; |
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187 friend class G1Allocator; |
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188 friend class G1DefaultAllocator; |
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189 friend class G1ResManAllocator; |
| 342 | 190 |
| 191 // Closures used in implementation. | |
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192 template <G1Barrier barrier, G1Mark do_mark_object> |
| 5987 | 193 friend class G1ParCopyClosure; |
| 342 | 194 friend class G1IsAliveClosure; |
| 195 friend class G1EvacuateFollowersClosure; | |
| 196 friend class G1ParScanThreadState; | |
| 197 friend class G1ParScanClosureSuper; | |
| 198 friend class G1ParEvacuateFollowersClosure; | |
| 199 friend class G1ParTask; | |
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200 friend class G1ParGCAllocator; |
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201 friend class G1DefaultParGCAllocator; |
| 342 | 202 friend class G1FreeGarbageRegionClosure; |
| 203 friend class RefineCardTableEntryClosure; | |
| 204 friend class G1PrepareCompactClosure; | |
| 205 friend class RegionSorter; | |
| 2152 | 206 friend class RegionResetter; |
| 342 | 207 friend class CountRCClosure; |
| 208 friend class EvacPopObjClosure; | |
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209 friend class G1ParCleanupCTTask; |
| 342 | 210 |
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211 friend class G1FreeHumongousRegionClosure; |
| 342 | 212 // Other related classes. |
| 213 friend class G1MarkSweep; | |
| 214 | |
| 215 private: | |
| 216 // The one and only G1CollectedHeap, so static functions can find it. | |
| 217 static G1CollectedHeap* _g1h; | |
| 218 | |
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219 static size_t _humongous_object_threshold_in_words; |
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220 |
| 2152 | 221 // The secondary free list which contains regions that have been |
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222 // freed up during the cleanup process. This will be appended to |
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223 // the master free list when appropriate. |
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224 FreeRegionList _secondary_free_list; |
| 2152 | 225 |
| 4072 | 226 // It keeps track of the old regions. |
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227 HeapRegionSet _old_set; |
| 4072 | 228 |
| 2152 | 229 // It keeps track of the humongous regions. |
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230 HeapRegionSet _humongous_set; |
| 342 | 231 |
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232 void clear_humongous_is_live_table(); |
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233 void eagerly_reclaim_humongous_regions(); |
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234 |
| 342 | 235 // The number of regions we could create by expansion. |
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236 uint _expansion_regions; |
| 342 | 237 |
| 238 // The block offset table for the G1 heap. | |
| 239 G1BlockOffsetSharedArray* _bot_shared; | |
| 240 | |
| 4072 | 241 // Tears down the region sets / lists so that they are empty and the |
| 242 // regions on the heap do not belong to a region set / list. The | |
| 243 // only exception is the humongous set which we leave unaltered. If | |
| 244 // free_list_only is true, it will only tear down the master free | |
| 245 // list. It is called before a Full GC (free_list_only == false) or | |
| 246 // before heap shrinking (free_list_only == true). | |
| 247 void tear_down_region_sets(bool free_list_only); | |
| 248 | |
| 249 // Rebuilds the region sets / lists so that they are repopulated to | |
| 250 // reflect the contents of the heap. The only exception is the | |
| 251 // humongous set which was not torn down in the first place. If | |
| 252 // free_list_only is true, it will only rebuild the master free | |
| 253 // list. It is called after a Full GC (free_list_only == false) or | |
| 254 // after heap shrinking (free_list_only == true). | |
| 255 void rebuild_region_sets(bool free_list_only); | |
| 342 | 256 |
| 20337 | 257 // Callback for region mapping changed events. |
| 258 G1RegionMappingChangedListener _listener; | |
| 259 | |
| 342 | 260 // The sequence of all heap regions in the heap. |
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261 HeapRegionManager _hrm; |
| 342 | 262 |
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263 // Class that handles the different kinds of allocations. |
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264 G1Allocator* _allocator; |
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265 |
| 6595 | 266 // PLAB sizing policy for survivors. |
| 267 PLABStats _survivor_plab_stats; | |
| 268 | |
| 269 // PLAB sizing policy for tenured objects. | |
| 270 PLABStats _old_plab_stats; | |
| 271 | |
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272 // It specifies whether we should attempt to expand the heap after a |
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273 // region allocation failure. If heap expansion fails we set this to |
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274 // false so that we don't re-attempt the heap expansion (it's likely |
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275 // that subsequent expansion attempts will also fail if one fails). |
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276 // Currently, it is only consulted during GC and it's reset at the |
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277 // start of each GC. |
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278 bool _expand_heap_after_alloc_failure; |
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279 |
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280 // It resets the mutator alloc region before new allocations can take place. |
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281 void init_mutator_alloc_region(); |
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282 |
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283 // It releases the mutator alloc region. |
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284 void release_mutator_alloc_region(); |
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285 |
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286 // It initializes the GC alloc regions at the start of a GC. |
| 10405 | 287 void init_gc_alloc_regions(EvacuationInfo& evacuation_info); |
| 342 | 288 |
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289 // It releases the GC alloc regions at the end of a GC. |
| 10405 | 290 void release_gc_alloc_regions(uint no_of_gc_workers, EvacuationInfo& evacuation_info); |
| 342 | 291 |
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292 // It does any cleanup that needs to be done on the GC alloc regions |
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293 // before a Full GC. |
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294 void abandon_gc_alloc_regions(); |
| 342 | 295 |
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296 // Helper for monitoring and management support. |
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297 G1MonitoringSupport* _g1mm; |
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298 |
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299 // Records whether the region at the given index is kept live by roots or |
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300 // references from the young generation. |
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301 class HumongousIsLiveBiasedMappedArray : public G1BiasedMappedArray<bool> { |
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302 protected: |
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303 bool default_value() const { return false; } |
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304 public: |
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305 void clear() { G1BiasedMappedArray<bool>::clear(); } |
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306 void set_live(uint region) { |
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307 set_by_index(region, true); |
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308 } |
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309 bool is_live(uint region) { |
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310 return get_by_index(region); |
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311 } |
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312 }; |
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313 |
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314 HumongousIsLiveBiasedMappedArray _humongous_is_live; |
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315 // Stores whether during humongous object registration we found candidate regions. |
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316 // If not, we can skip a few steps. |
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317 bool _has_humongous_reclaim_candidates; |
| 526 | 318 |
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319 volatile unsigned _gc_time_stamp; |
| 342 | 320 |
| 321 size_t* _surviving_young_words; | |
| 322 | |
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323 G1HRPrinter _hr_printer; |
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324 |
| 342 | 325 void setup_surviving_young_words(); |
| 326 void update_surviving_young_words(size_t* surv_young_words); | |
| 327 void cleanup_surviving_young_words(); | |
| 328 | |
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329 // It decides whether an explicit GC should start a concurrent cycle |
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330 // instead of doing a STW GC. Currently, a concurrent cycle is |
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331 // explicitly started if: |
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332 // (a) cause == _gc_locker and +GCLockerInvokesConcurrent, or |
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333 // (b) cause == _java_lang_system_gc and +ExplicitGCInvokesConcurrent. |
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334 // (c) cause == _g1_humongous_allocation |
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335 bool should_do_concurrent_full_gc(GCCause::Cause cause); |
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336 |
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337 // Keeps track of how many "old marking cycles" (i.e., Full GCs or |
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338 // concurrent cycles) we have started. |
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339 volatile unsigned int _old_marking_cycles_started; |
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340 |
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341 // Keeps track of how many "old marking cycles" (i.e., Full GCs or |
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342 // concurrent cycles) we have completed. |
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343 volatile unsigned int _old_marking_cycles_completed; |
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344 |
| 10405 | 345 bool _concurrent_cycle_started; |
| 346 | |
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347 // This is a non-product method that is helpful for testing. It is |
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348 // called at the end of a GC and artificially expands the heap by |
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349 // allocating a number of dead regions. This way we can induce very |
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350 // frequent marking cycles and stress the cleanup / concurrent |
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351 // cleanup code more (as all the regions that will be allocated by |
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352 // this method will be found dead by the marking cycle). |
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353 void allocate_dummy_regions() PRODUCT_RETURN; |
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354 |
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355 // Clear RSets after a compaction. It also resets the GC time stamps. |
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356 void clear_rsets_post_compaction(); |
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357 |
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358 // If the HR printer is active, dump the state of the regions in the |
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359 // heap after a compaction. |
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360 void print_hrm_post_compaction(); |
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361 |
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362 double verify(bool guard, const char* msg); |
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363 void verify_before_gc(); |
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364 void verify_after_gc(); |
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365 |
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366 void log_gc_header(); |
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367 void log_gc_footer(double pause_time_sec); |
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368 |
| 1973 | 369 // These are macros so that, if the assert fires, we get the correct |
| 370 // line number, file, etc. | |
| 371 | |
| 2361 | 372 #define heap_locking_asserts_err_msg(_extra_message_) \ |
| 2152 | 373 err_msg("%s : Heap_lock locked: %s, at safepoint: %s, is VM thread: %s", \ |
| 2361 | 374 (_extra_message_), \ |
| 2152 | 375 BOOL_TO_STR(Heap_lock->owned_by_self()), \ |
| 376 BOOL_TO_STR(SafepointSynchronize::is_at_safepoint()), \ | |
| 377 BOOL_TO_STR(Thread::current()->is_VM_thread())) | |
| 1973 | 378 |
| 379 #define assert_heap_locked() \ | |
| 380 do { \ | |
| 381 assert(Heap_lock->owned_by_self(), \ | |
| 382 heap_locking_asserts_err_msg("should be holding the Heap_lock")); \ | |
| 383 } while (0) | |
| 384 | |
| 2361 | 385 #define assert_heap_locked_or_at_safepoint(_should_be_vm_thread_) \ |
| 1973 | 386 do { \ |
| 387 assert(Heap_lock->owned_by_self() || \ | |
| 2152 | 388 (SafepointSynchronize::is_at_safepoint() && \ |
| 2361 | 389 ((_should_be_vm_thread_) == Thread::current()->is_VM_thread())), \ |
| 1973 | 390 heap_locking_asserts_err_msg("should be holding the Heap_lock or " \ |
| 391 "should be at a safepoint")); \ | |
| 392 } while (0) | |
| 393 | |
| 394 #define assert_heap_locked_and_not_at_safepoint() \ | |
| 395 do { \ | |
| 396 assert(Heap_lock->owned_by_self() && \ | |
| 397 !SafepointSynchronize::is_at_safepoint(), \ | |
| 398 heap_locking_asserts_err_msg("should be holding the Heap_lock and " \ | |
| 399 "should not be at a safepoint")); \ | |
| 400 } while (0) | |
| 401 | |
| 402 #define assert_heap_not_locked() \ | |
| 403 do { \ | |
| 404 assert(!Heap_lock->owned_by_self(), \ | |
| 405 heap_locking_asserts_err_msg("should not be holding the Heap_lock")); \ | |
| 406 } while (0) | |
| 407 | |
| 408 #define assert_heap_not_locked_and_not_at_safepoint() \ | |
| 409 do { \ | |
| 410 assert(!Heap_lock->owned_by_self() && \ | |
| 411 !SafepointSynchronize::is_at_safepoint(), \ | |
| 412 heap_locking_asserts_err_msg("should not be holding the Heap_lock and " \ | |
| 413 "should not be at a safepoint")); \ | |
| 414 } while (0) | |
| 415 | |
| 2361 | 416 #define assert_at_safepoint(_should_be_vm_thread_) \ |
| 1973 | 417 do { \ |
| 2152 | 418 assert(SafepointSynchronize::is_at_safepoint() && \ |
| 2361 | 419 ((_should_be_vm_thread_) == Thread::current()->is_VM_thread()), \ |
| 1973 | 420 heap_locking_asserts_err_msg("should be at a safepoint")); \ |
| 421 } while (0) | |
| 422 | |
| 423 #define assert_not_at_safepoint() \ | |
| 424 do { \ | |
| 425 assert(!SafepointSynchronize::is_at_safepoint(), \ | |
| 426 heap_locking_asserts_err_msg("should not be at a safepoint")); \ | |
| 427 } while (0) | |
| 428 | |
| 342 | 429 protected: |
| 430 | |
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431 // The young region list. |
| 342 | 432 YoungList* _young_list; |
| 433 | |
| 434 // The current policy object for the collector. | |
| 435 G1CollectorPolicy* _g1_policy; | |
| 436 | |
| 2152 | 437 // This is the second level of trying to allocate a new region. If |
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438 // new_region() didn't find a region on the free_list, this call will |
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439 // check whether there's anything available on the |
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440 // secondary_free_list and/or wait for more regions to appear on |
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441 // that list, if _free_regions_coming is set. |
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442 HeapRegion* new_region_try_secondary_free_list(bool is_old); |
| 342 | 443 |
| 2361 | 444 // Try to allocate a single non-humongous HeapRegion sufficient for |
| 445 // an allocation of the given word_size. If do_expand is true, | |
| 446 // attempt to expand the heap if necessary to satisfy the allocation | |
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447 // request. If the region is to be used as an old region or for a |
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448 // humongous object, set is_old to true. If not, to false. |
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449 HeapRegion* new_region(size_t word_size, bool is_old, bool do_expand); |
| 342 | 450 |
| 2361 | 451 // Initialize a contiguous set of free regions of length num_regions |
| 452 // and starting at index first so that they appear as a single | |
| 453 // humongous region. | |
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454 HeapWord* humongous_obj_allocate_initialize_regions(uint first, |
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455 uint num_regions, |
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456 size_t word_size, |
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457 AllocationContext_t context); |
| 2361 | 458 |
| 459 // Attempt to allocate a humongous object of the given size. Return | |
| 460 // NULL if unsuccessful. | |
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461 HeapWord* humongous_obj_allocate(size_t word_size, AllocationContext_t context); |
| 1973 | 462 |
| 463 // The following two methods, allocate_new_tlab() and | |
| 464 // mem_allocate(), are the two main entry points from the runtime | |
| 465 // into the G1's allocation routines. They have the following | |
| 466 // assumptions: | |
| 467 // | |
| 468 // * They should both be called outside safepoints. | |
| 469 // | |
| 470 // * They should both be called without holding the Heap_lock. | |
| 471 // | |
| 472 // * All allocation requests for new TLABs should go to | |
| 473 // allocate_new_tlab(). | |
| 474 // | |
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475 // * All non-TLAB allocation requests should go to mem_allocate(). |
| 1973 | 476 // |
| 477 // * If either call cannot satisfy the allocation request using the | |
| 478 // current allocating region, they will try to get a new one. If | |
| 479 // this fails, they will attempt to do an evacuation pause and | |
| 480 // retry the allocation. | |
| 481 // | |
| 482 // * If all allocation attempts fail, even after trying to schedule | |
| 483 // an evacuation pause, allocate_new_tlab() will return NULL, | |
| 484 // whereas mem_allocate() will attempt a heap expansion and/or | |
| 485 // schedule a Full GC. | |
| 486 // | |
| 487 // * We do not allow humongous-sized TLABs. So, allocate_new_tlab | |
| 488 // should never be called with word_size being humongous. All | |
| 489 // humongous allocation requests should go to mem_allocate() which | |
| 490 // will satisfy them with a special path. | |
| 491 | |
| 492 virtual HeapWord* allocate_new_tlab(size_t word_size); | |
| 493 | |
| 494 virtual HeapWord* mem_allocate(size_t word_size, | |
| 495 bool* gc_overhead_limit_was_exceeded); | |
| 342 | 496 |
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497 // The following three methods take a gc_count_before_ret |
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498 // parameter which is used to return the GC count if the method |
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499 // returns NULL. Given that we are required to read the GC count |
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500 // while holding the Heap_lock, and these paths will take the |
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501 // Heap_lock at some point, it's easier to get them to read the GC |
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502 // count while holding the Heap_lock before they return NULL instead |
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503 // of the caller (namely: mem_allocate()) having to also take the |
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504 // Heap_lock just to read the GC count. |
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505 |
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506 // First-level mutator allocation attempt: try to allocate out of |
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507 // the mutator alloc region without taking the Heap_lock. This |
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508 // should only be used for non-humongous allocations. |
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509 inline HeapWord* attempt_allocation(size_t word_size, |
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510 unsigned int* gc_count_before_ret, |
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511 int* gclocker_retry_count_ret); |
| 342 | 512 |
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513 // Second-level mutator allocation attempt: take the Heap_lock and |
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514 // retry the allocation attempt, potentially scheduling a GC |
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515 // pause. This should only be used for non-humongous allocations. |
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516 HeapWord* attempt_allocation_slow(size_t word_size, |
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517 AllocationContext_t context, |
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518 unsigned int* gc_count_before_ret, |
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519 int* gclocker_retry_count_ret); |
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520 |
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521 // Takes the Heap_lock and attempts a humongous allocation. It can |
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522 // potentially schedule a GC pause. |
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523 HeapWord* attempt_allocation_humongous(size_t word_size, |
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524 unsigned int* gc_count_before_ret, |
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525 int* gclocker_retry_count_ret); |
| 1973 | 526 |
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527 // Allocation attempt that should be called during safepoints (e.g., |
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528 // at the end of a successful GC). expect_null_mutator_alloc_region |
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529 // specifies whether the mutator alloc region is expected to be NULL |
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530 // or not. |
| 1973 | 531 HeapWord* attempt_allocation_at_safepoint(size_t word_size, |
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532 AllocationContext_t context, |
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533 bool expect_null_mutator_alloc_region); |
| 1973 | 534 |
| 535 // It dirties the cards that cover the block so that so that the post | |
| 536 // write barrier never queues anything when updating objects on this | |
| 537 // block. It is assumed (and in fact we assert) that the block | |
| 538 // belongs to a young region. | |
| 539 inline void dirty_young_block(HeapWord* start, size_t word_size); | |
| 342 | 540 |
| 541 // Allocate blocks during garbage collection. Will ensure an | |
| 542 // allocation region, either by picking one or expanding the | |
| 543 // heap, and then allocate a block of the given size. The block | |
| 544 // may not be a humongous - it must fit into a single heap region. | |
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545 HeapWord* par_allocate_during_gc(GCAllocPurpose purpose, |
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546 size_t word_size, |
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547 AllocationContext_t context); |
| 342 | 548 |
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549 HeapWord* allocate_during_gc_slow(GCAllocPurpose purpose, |
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550 HeapRegion* alloc_region, |
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551 bool par, |
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552 size_t word_size); |
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553 |
| 342 | 554 // Ensure that no further allocations can happen in "r", bearing in mind |
| 555 // that parallel threads might be attempting allocations. | |
| 556 void par_allocate_remaining_space(HeapRegion* r); | |
| 557 | |
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558 // Allocation attempt during GC for a survivor object / PLAB. |
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559 inline HeapWord* survivor_attempt_allocation(size_t word_size, |
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560 AllocationContext_t context); |
| 545 | 561 |
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562 // Allocation attempt during GC for an old object / PLAB. |
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563 inline HeapWord* old_attempt_allocation(size_t word_size, |
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564 AllocationContext_t context); |
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565 |
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566 // These methods are the "callbacks" from the G1AllocRegion class. |
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567 |
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568 // For mutator alloc regions. |
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569 HeapRegion* new_mutator_alloc_region(size_t word_size, bool force); |
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570 void retire_mutator_alloc_region(HeapRegion* alloc_region, |
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571 size_t allocated_bytes); |
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572 |
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573 // For GC alloc regions. |
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574 HeapRegion* new_gc_alloc_region(size_t word_size, uint count, |
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575 GCAllocPurpose ap); |
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576 void retire_gc_alloc_region(HeapRegion* alloc_region, |
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577 size_t allocated_bytes, GCAllocPurpose ap); |
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578 |
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579 // - if explicit_gc is true, the GC is for a System.gc() or a heap |
| 1973 | 580 // inspection request and should collect the entire heap |
| 581 // - if clear_all_soft_refs is true, all soft references should be | |
| 582 // cleared during the GC | |
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583 // - if explicit_gc is false, word_size describes the allocation that |
| 1973 | 584 // the GC should attempt (at least) to satisfy |
| 585 // - it returns false if it is unable to do the collection due to the | |
| 586 // GC locker being active, true otherwise | |
| 587 bool do_collection(bool explicit_gc, | |
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588 bool clear_all_soft_refs, |
| 342 | 589 size_t word_size); |
| 590 | |
| 591 // Callback from VM_G1CollectFull operation. | |
| 592 // Perform a full collection. | |
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593 virtual void do_full_collection(bool clear_all_soft_refs); |
| 342 | 594 |
| 595 // Resize the heap if necessary after a full collection. If this is | |
| 596 // after a collect-for allocation, "word_size" is the allocation size, | |
| 597 // and will be considered part of the used portion of the heap. | |
| 598 void resize_if_necessary_after_full_collection(size_t word_size); | |
| 599 | |
| 600 // Callback from VM_G1CollectForAllocation operation. | |
| 601 // This function does everything necessary/possible to satisfy a | |
| 602 // failed allocation request (including collection, expansion, etc.) | |
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603 HeapWord* satisfy_failed_allocation(size_t word_size, |
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604 AllocationContext_t context, |
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605 bool* succeeded); |
| 342 | 606 |
| 607 // Attempting to expand the heap sufficiently | |
| 608 // to support an allocation of the given "word_size". If | |
| 609 // successful, perform the allocation and return the address of the | |
| 610 // allocated block, or else "NULL". | |
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611 HeapWord* expand_and_allocate(size_t word_size, AllocationContext_t context); |
| 342 | 612 |
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613 // Process any reference objects discovered during |
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614 // an incremental evacuation pause. |
| 6819 | 615 void process_discovered_references(uint no_of_gc_workers); |
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616 |
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617 // Enqueue any remaining discovered references |
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618 // after processing. |
| 6819 | 619 void enqueue_discovered_references(uint no_of_gc_workers); |
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620 |
| 342 | 621 public: |
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622 |
| 20417 | 623 G1Allocator* allocator() { |
| 624 return _allocator; | |
| 625 } | |
| 626 | |
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627 G1MonitoringSupport* g1mm() { |
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628 assert(_g1mm != NULL, "should have been initialized"); |
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629 return _g1mm; |
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630 } |
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631 |
| 342 | 632 // Expand the garbage-first heap by at least the given size (in bytes!). |
|
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633 // Returns true if the heap was expanded by the requested amount; |
|
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634 // false otherwise. |
| 342 | 635 // (Rounds up to a HeapRegion boundary.) |
|
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636 bool expand(size_t expand_bytes); |
| 342 | 637 |
|
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638 // Returns the PLAB statistics given a purpose. |
|
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639 PLABStats* stats_for_purpose(GCAllocPurpose purpose) { |
|
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640 PLABStats* stats = NULL; |
|
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|
641 |
|
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642 switch (purpose) { |
|
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643 case GCAllocForSurvived: |
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644 stats = &_survivor_plab_stats; |
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645 break; |
|
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646 case GCAllocForTenured: |
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647 stats = &_old_plab_stats; |
|
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648 break; |
|
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|
649 default: |
|
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650 assert(false, "unrecognized GCAllocPurpose"); |
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651 } |
|
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|
652 |
|
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653 return stats; |
|
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|
654 } |
|
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655 |
|
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656 // Determines PLAB size for a particular allocation purpose. |
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657 size_t desired_plab_sz(GCAllocPurpose purpose); |
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658 |
| 342 | 659 // Do anything common to GC's. |
| 660 virtual void gc_prologue(bool full); | |
| 661 virtual void gc_epilogue(bool full); | |
| 662 | |
|
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663 inline void set_humongous_is_live(oop obj); |
|
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664 |
|
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665 bool humongous_is_live(uint region) { |
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666 return _humongous_is_live.is_live(region); |
|
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667 } |
|
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668 |
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669 // Returns whether the given region (which must be a humongous (start) region) |
|
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670 // is to be considered conservatively live regardless of any other conditions. |
|
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671 bool humongous_region_is_always_live(uint index); |
|
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672 // Register the given region to be part of the collection set. |
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673 inline void register_humongous_region_with_in_cset_fast_test(uint index); |
|
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674 // Register regions with humongous objects (actually on the start region) in |
|
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675 // the in_cset_fast_test table. |
|
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676 void register_humongous_regions_with_in_cset_fast_test(); |
| 526 | 677 // We register a region with the fast "in collection set" test. We |
| 678 // simply set to true the array slot corresponding to this region. | |
| 679 void register_region_with_in_cset_fast_test(HeapRegion* r) { | |
|
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680 _in_cset_fast_test.set_in_cset(r->hrm_index()); |
| 526 | 681 } |
| 682 | |
| 683 // This is a fast test on whether a reference points into the | |
|
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684 // collection set or not. Assume that the reference |
|
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685 // points into the heap. |
|
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|
686 inline bool in_cset_fast_test(oop obj); |
| 526 | 687 |
|
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688 void clear_cset_fast_test() { |
|
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689 _in_cset_fast_test.clear(); |
|
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690 } |
|
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|
691 |
|
6120
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692 // This is called at the start of either a concurrent cycle or a Full |
|
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693 // GC to update the number of old marking cycles started. |
|
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|
694 void increment_old_marking_cycles_started(); |
|
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|
695 |
|
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|
696 // This is called at the end of either a concurrent cycle or a Full |
|
6120
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|
697 // GC to update the number of old marking cycles completed. Those two |
|
1656
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|
698 // can happen in a nested fashion, i.e., we start a concurrent |
|
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|
699 // cycle, a Full GC happens half-way through it which ends first, |
|
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|
700 // and then the cycle notices that a Full GC happened and ends |
|
2030
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7000559: G1: assertion failure !outer || (full_collections_started == _full_collections_completed + 1)
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diff
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|
701 // too. The concurrent parameter is a boolean to help us do a bit |
|
fb712ff22571
7000559: G1: assertion failure !outer || (full_collections_started == _full_collections_completed + 1)
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|
702 // tighter consistency checking in the method. If concurrent is |
|
fb712ff22571
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diff
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|
703 // false, the caller is the inner caller in the nesting (i.e., the |
|
fb712ff22571
7000559: G1: assertion failure !outer || (full_collections_started == _full_collections_completed + 1)
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|
704 // Full GC). If concurrent is true, the caller is the outer caller |
|
fb712ff22571
7000559: G1: assertion failure !outer || (full_collections_started == _full_collections_completed + 1)
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diff
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|
705 // in this nesting (i.e., the concurrent cycle). Further nesting is |
|
6120
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diff
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|
706 // not currently supported. The end of this call also notifies |
|
2030
fb712ff22571
7000559: G1: assertion failure !outer || (full_collections_started == _full_collections_completed + 1)
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diff
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|
707 // the FullGCCount_lock in case a Java thread is waiting for a full |
|
fb712ff22571
7000559: G1: assertion failure !outer || (full_collections_started == _full_collections_completed + 1)
tonyp
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1991
diff
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|
708 // GC to happen (e.g., it called System.gc() with |
|
1656
4e5661ba9d98
6944166: G1: explicit GCs are not always handled correctly
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diff
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|
709 // +ExplicitGCInvokesConcurrent). |
|
6120
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7172388: G1: _total_full_collections should not be incremented for concurrent cycles
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diff
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|
710 void increment_old_marking_cycles_completed(bool concurrent); |
|
1656
4e5661ba9d98
6944166: G1: explicit GCs are not always handled correctly
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1611
diff
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|
711 |
|
6120
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brutisso
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6010
diff
changeset
|
712 unsigned int old_marking_cycles_completed() { |
|
37552638d24a
7172388: G1: _total_full_collections should not be incremented for concurrent cycles
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diff
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|
713 return _old_marking_cycles_completed; |
|
1656
4e5661ba9d98
6944166: G1: explicit GCs are not always handled correctly
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diff
changeset
|
714 } |
|
4e5661ba9d98
6944166: G1: explicit GCs are not always handled correctly
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diff
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|
715 |
|
13400
86e6d691f2e1
8028128: Add a type safe alternative for working with counter based data
mgronlun
parents:
12352
diff
changeset
|
716 void register_concurrent_cycle_start(const Ticks& start_time); |
| 10405 | 717 void register_concurrent_cycle_end(); |
| 718 void trace_heap_after_concurrent_cycle(); | |
| 719 | |
| 720 G1YCType yc_type(); | |
| 721 | |
|
3778
5f6f2615433a
7049999: G1: Make the G1PrintHeapRegions output consistent and complete
tonyp
parents:
3777
diff
changeset
|
722 G1HRPrinter* hr_printer() { return &_hr_printer; } |
|
5f6f2615433a
7049999: G1: Make the G1PrintHeapRegions output consistent and complete
tonyp
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3777
diff
changeset
|
723 |
|
17736
58fc1b1523dc
8034079: G1: Refactor the HeapRegionSet hierarchy
brutisso
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diff
changeset
|
724 // Frees a non-humongous region by initializing its contents and |
|
58fc1b1523dc
8034079: G1: Refactor the HeapRegionSet hierarchy
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17727
diff
changeset
|
725 // adding it to the free list that's passed as a parameter (this is |
|
58fc1b1523dc
8034079: G1: Refactor the HeapRegionSet hierarchy
brutisso
parents:
17727
diff
changeset
|
726 // usually a local list which will be appended to the master free |
|
58fc1b1523dc
8034079: G1: Refactor the HeapRegionSet hierarchy
brutisso
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17727
diff
changeset
|
727 // list later). The used bytes of freed regions are accumulated in |
|
58fc1b1523dc
8034079: G1: Refactor the HeapRegionSet hierarchy
brutisso
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17727
diff
changeset
|
728 // pre_used. If par is true, the region's RSet will not be freed |
|
58fc1b1523dc
8034079: G1: Refactor the HeapRegionSet hierarchy
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17727
diff
changeset
|
729 // up. The assumption is that this will be done later. |
|
17755
96b1c2e06e25
8027295: Free CSet takes ~50% of young pause time
tschatzl
parents:
17753
diff
changeset
|
730 // The locked parameter indicates if the caller has already taken |
|
96b1c2e06e25
8027295: Free CSet takes ~50% of young pause time
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17753
diff
changeset
|
731 // care of proper synchronization. This may allow some optimizations. |
|
17736
58fc1b1523dc
8034079: G1: Refactor the HeapRegionSet hierarchy
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diff
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|
732 void free_region(HeapRegion* hr, |
|
58fc1b1523dc
8034079: G1: Refactor the HeapRegionSet hierarchy
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|
733 FreeRegionList* free_list, |
|
17755
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8027295: Free CSet takes ~50% of young pause time
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diff
changeset
|
734 bool par, |
|
96b1c2e06e25
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diff
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|
735 bool locked = false); |
|
17736
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diff
changeset
|
736 |
|
58fc1b1523dc
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17727
diff
changeset
|
737 // Frees a humongous region by collapsing it into individual regions |
|
58fc1b1523dc
8034079: G1: Refactor the HeapRegionSet hierarchy
brutisso
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17727
diff
changeset
|
738 // and calling free_region() for each of them. The freed regions |
|
58fc1b1523dc
8034079: G1: Refactor the HeapRegionSet hierarchy
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diff
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|
739 // will be added to the free list that's passed as a parameter (this |
|
58fc1b1523dc
8034079: G1: Refactor the HeapRegionSet hierarchy
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17727
diff
changeset
|
740 // is usually a local list which will be appended to the master free |
|
58fc1b1523dc
8034079: G1: Refactor the HeapRegionSet hierarchy
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17727
diff
changeset
|
741 // list later). The used bytes of freed regions are accumulated in |
|
58fc1b1523dc
8034079: G1: Refactor the HeapRegionSet hierarchy
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17727
diff
changeset
|
742 // pre_used. If par is true, the region's RSet will not be freed |
|
58fc1b1523dc
8034079: G1: Refactor the HeapRegionSet hierarchy
brutisso
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17727
diff
changeset
|
743 // up. The assumption is that this will be done later. |
|
58fc1b1523dc
8034079: G1: Refactor the HeapRegionSet hierarchy
brutisso
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diff
changeset
|
744 void free_humongous_region(HeapRegion* hr, |
|
58fc1b1523dc
8034079: G1: Refactor the HeapRegionSet hierarchy
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17727
diff
changeset
|
745 FreeRegionList* free_list, |
|
58fc1b1523dc
8034079: G1: Refactor the HeapRegionSet hierarchy
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changeset
|
746 bool par); |
| 342 | 747 protected: |
| 748 | |
| 749 // Shrink the garbage-first heap by at most the given size (in bytes!). | |
| 750 // (Rounds down to a HeapRegion boundary.) | |
| 751 virtual void shrink(size_t expand_bytes); | |
| 752 void shrink_helper(size_t expand_bytes); | |
| 753 | |
| 1709 | 754 #if TASKQUEUE_STATS |
| 755 static void print_taskqueue_stats_hdr(outputStream* const st = gclog_or_tty); | |
| 756 void print_taskqueue_stats(outputStream* const st = gclog_or_tty) const; | |
| 757 void reset_taskqueue_stats(); | |
| 758 #endif // TASKQUEUE_STATS | |
| 759 | |
| 1973 | 760 // Schedule the VM operation that will do an evacuation pause to |
| 761 // satisfy an allocation request of word_size. *succeeded will | |
| 762 // return whether the VM operation was successful (it did do an | |
| 763 // evacuation pause) or not (another thread beat us to it or the GC | |
| 764 // locker was active). Given that we should not be holding the | |
| 765 // Heap_lock when we enter this method, we will pass the | |
| 766 // gc_count_before (i.e., total_collections()) as a parameter since | |
| 767 // it has to be read while holding the Heap_lock. Currently, both | |
| 768 // methods that call do_collection_pause() release the Heap_lock | |
| 769 // before the call, so it's easy to read gc_count_before just before. | |
|
12113
f7d3b4387a16
8022872: G1: Use correct GC cause for young GC triggered by humongous allocations
brutisso
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12080
diff
changeset
|
770 HeapWord* do_collection_pause(size_t word_size, |
|
f7d3b4387a16
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brutisso
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12080
diff
changeset
|
771 unsigned int gc_count_before, |
|
f7d3b4387a16
8022872: G1: Use correct GC cause for young GC triggered by humongous allocations
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12080
diff
changeset
|
772 bool* succeeded, |
|
f7d3b4387a16
8022872: G1: Use correct GC cause for young GC triggered by humongous allocations
brutisso
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diff
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|
773 GCCause::Cause gc_cause); |
| 342 | 774 |
| 775 // The guts of the incremental collection pause, executed by the vm | |
| 1973 | 776 // thread. It returns false if it is unable to do the collection due |
| 777 // to the GC locker being active, true otherwise | |
| 778 bool do_collection_pause_at_safepoint(double target_pause_time_ms); | |
| 342 | 779 |
| 780 // Actually do the work of evacuating the collection set. | |
| 10405 | 781 void evacuate_collection_set(EvacuationInfo& evacuation_info); |
| 342 | 782 |
| 783 // The g1 remembered set of the heap. | |
| 784 G1RemSet* _g1_rem_set; | |
| 785 | |
|
616
4f360ec815ba
6720309: G1: don't synchronously update RSet during evacuation pauses
iveresov
parents:
545
diff
changeset
|
786 // A set of cards that cover the objects for which the Rsets should be updated |
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787 // concurrently after the collection. |
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788 DirtyCardQueueSet _dirty_card_queue_set; |
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789 |
| 342 | 790 // The closure used to refine a single card. |
| 791 RefineCardTableEntryClosure* _refine_cte_cl; | |
| 792 | |
| 793 // A function to check the consistency of dirty card logs. | |
| 794 void check_ct_logs_at_safepoint(); | |
| 795 | |
| 1705 | 796 // A DirtyCardQueueSet that is used to hold cards that contain |
| 797 // references into the current collection set. This is used to | |
| 798 // update the remembered sets of the regions in the collection | |
| 799 // set in the event of an evacuation failure. | |
| 800 DirtyCardQueueSet _into_cset_dirty_card_queue_set; | |
| 801 | |
| 342 | 802 // After a collection pause, make the regions in the CS into free |
| 803 // regions. | |
| 10405 | 804 void free_collection_set(HeapRegion* cs_head, EvacuationInfo& evacuation_info); |
| 342 | 805 |
|
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806 // Abandon the current collection set without recording policy |
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807 // statistics or updating free lists. |
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808 void abandon_collection_set(HeapRegion* cs_head); |
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809 |
| 342 | 810 // Applies "scan_non_heap_roots" to roots outside the heap, |
| 811 // "scan_rs" to roots inside the heap (having done "set_region" to | |
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812 // indicate the region in which the root resides), |
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813 // and does "scan_metadata" If "scan_rs" is |
| 342 | 814 // NULL, then this step is skipped. The "worker_i" |
| 815 // param is for use with parallel roots processing, and should be | |
| 816 // the "i" of the calling parallel worker thread's work(i) function. | |
| 817 // In the sequential case this param will be ignored. | |
|
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818 void g1_process_roots(OopClosure* scan_non_heap_roots, |
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819 OopClosure* scan_non_heap_weak_roots, |
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820 OopsInHeapRegionClosure* scan_rs, |
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821 CLDClosure* scan_strong_clds, |
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822 CLDClosure* scan_weak_clds, |
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823 CodeBlobClosure* scan_strong_code, |
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824 uint worker_i); |
| 342 | 825 |
| 826 // The concurrent marker (and the thread it runs in.) | |
| 827 ConcurrentMark* _cm; | |
| 828 ConcurrentMarkThread* _cmThread; | |
| 829 bool _mark_in_progress; | |
| 830 | |
| 831 // The concurrent refiner. | |
| 832 ConcurrentG1Refine* _cg1r; | |
| 833 | |
| 834 // The parallel task queues | |
| 835 RefToScanQueueSet *_task_queues; | |
| 836 | |
| 837 // True iff a evacuation has failed in the current collection. | |
| 838 bool _evacuation_failed; | |
| 839 | |
| 10405 | 840 EvacuationFailedInfo* _evacuation_failed_info_array; |
| 342 | 841 |
| 842 // Failed evacuations cause some logical from-space objects to have | |
| 843 // forwarding pointers to themselves. Reset them. | |
| 844 void remove_self_forwarding_pointers(); | |
| 845 | |
|
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846 // Together, these store an object with a preserved mark, and its mark value. |
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847 Stack<oop, mtGC> _objs_with_preserved_marks; |
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848 Stack<markOop, mtGC> _preserved_marks_of_objs; |
| 342 | 849 |
| 850 // Preserve the mark of "obj", if necessary, in preparation for its mark | |
| 851 // word being overwritten with a self-forwarding-pointer. | |
| 852 void preserve_mark_if_necessary(oop obj, markOop m); | |
| 853 | |
| 854 // The stack of evac-failure objects left to be scanned. | |
| 855 GrowableArray<oop>* _evac_failure_scan_stack; | |
| 856 // The closure to apply to evac-failure objects. | |
| 857 | |
| 858 OopsInHeapRegionClosure* _evac_failure_closure; | |
| 859 // Set the field above. | |
| 860 void | |
| 861 set_evac_failure_closure(OopsInHeapRegionClosure* evac_failure_closure) { | |
| 862 _evac_failure_closure = evac_failure_closure; | |
| 863 } | |
| 864 | |
| 865 // Push "obj" on the scan stack. | |
| 866 void push_on_evac_failure_scan_stack(oop obj); | |
| 867 // Process scan stack entries until the stack is empty. | |
| 868 void drain_evac_failure_scan_stack(); | |
| 869 // True iff an invocation of "drain_scan_stack" is in progress; to | |
| 870 // prevent unnecessary recursion. | |
| 871 bool _drain_in_progress; | |
| 872 | |
| 873 // Do any necessary initialization for evacuation-failure handling. | |
| 874 // "cl" is the closure that will be used to process evac-failure | |
| 875 // objects. | |
| 876 void init_for_evac_failure(OopsInHeapRegionClosure* cl); | |
| 877 // Do any necessary cleanup for evacuation-failure handling data | |
| 878 // structures. | |
| 879 void finalize_for_evac_failure(); | |
| 880 | |
| 881 // An attempt to evacuate "obj" has failed; take necessary steps. | |
| 10405 | 882 oop handle_evacuation_failure_par(G1ParScanThreadState* _par_scan_state, oop obj); |
| 342 | 883 void handle_evacuation_failure_common(oop obj, markOop m); |
| 884 | |
|
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885 #ifndef PRODUCT |
|
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886 // Support for forcing evacuation failures. Analogous to |
|
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887 // PromotionFailureALot for the other collectors. |
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888 |
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889 // Records whether G1EvacuationFailureALot should be in effect |
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890 // for the current GC |
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891 bool _evacuation_failure_alot_for_current_gc; |
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892 |
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893 // Used to record the GC number for interval checking when |
|
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894 // determining whether G1EvaucationFailureALot is in effect |
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895 // for the current GC. |
|
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896 size_t _evacuation_failure_alot_gc_number; |
|
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|
897 |
|
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898 // Count of the number of evacuations between failures. |
|
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899 volatile size_t _evacuation_failure_alot_count; |
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|
900 |
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901 // Set whether G1EvacuationFailureALot should be in effect |
|
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902 // for the current GC (based upon the type of GC and which |
|
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903 // command line flags are set); |
|
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904 inline bool evacuation_failure_alot_for_gc_type(bool gcs_are_young, |
|
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|
905 bool during_initial_mark, |
|
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|
906 bool during_marking); |
|
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|
907 |
|
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908 inline void set_evacuation_failure_alot_for_current_gc(); |
|
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|
909 |
|
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910 // Return true if it's time to cause an evacuation failure. |
|
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|
911 inline bool evacuation_should_fail(); |
|
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912 |
|
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|
913 // Reset the G1EvacuationFailureALot counters. Should be called at |
| 10405 | 914 // the end of an evacuation pause in which an evacuation failure occurred. |
|
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915 inline void reset_evacuation_should_fail(); |
|
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916 #endif // !PRODUCT |
|
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|
917 |
|
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918 // ("Weak") Reference processing support. |
|
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919 // |
| 10405 | 920 // G1 has 2 instances of the reference processor class. One |
|
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921 // (_ref_processor_cm) handles reference object discovery |
|
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922 // and subsequent processing during concurrent marking cycles. |
|
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923 // |
|
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924 // The other (_ref_processor_stw) handles reference object |
|
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925 // discovery and processing during full GCs and incremental |
|
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|
926 // evacuation pauses. |
|
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|
927 // |
|
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928 // During an incremental pause, reference discovery will be |
|
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929 // temporarily disabled for _ref_processor_cm and will be |
|
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930 // enabled for _ref_processor_stw. At the end of the evacuation |
|
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931 // pause references discovered by _ref_processor_stw will be |
|
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932 // processed and discovery will be disabled. The previous |
|
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933 // setting for reference object discovery for _ref_processor_cm |
|
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934 // will be re-instated. |
|
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935 // |
|
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936 // At the start of marking: |
|
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937 // * Discovery by the CM ref processor is verified to be inactive |
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938 // and it's discovered lists are empty. |
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939 // * Discovery by the CM ref processor is then enabled. |
|
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940 // |
|
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941 // At the end of marking: |
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942 // * Any references on the CM ref processor's discovered |
|
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943 // lists are processed (possibly MT). |
|
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944 // |
|
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945 // At the start of full GC we: |
|
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946 // * Disable discovery by the CM ref processor and |
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947 // empty CM ref processor's discovered lists |
|
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948 // (without processing any entries). |
|
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949 // * Verify that the STW ref processor is inactive and it's |
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950 // discovered lists are empty. |
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951 // * Temporarily set STW ref processor discovery as single threaded. |
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952 // * Temporarily clear the STW ref processor's _is_alive_non_header |
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953 // field. |
|
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954 // * Finally enable discovery by the STW ref processor. |
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955 // |
|
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956 // The STW ref processor is used to record any discovered |
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957 // references during the full GC. |
|
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958 // |
|
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959 // At the end of a full GC we: |
|
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960 // * Enqueue any reference objects discovered by the STW ref processor |
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961 // that have non-live referents. This has the side-effect of |
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962 // making the STW ref processor inactive by disabling discovery. |
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963 // * Verify that the CM ref processor is still inactive |
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964 // and no references have been placed on it's discovered |
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965 // lists (also checked as a precondition during initial marking). |
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|
966 |
|
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967 // The (stw) reference processor... |
|
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|
968 ReferenceProcessor* _ref_processor_stw; |
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|
969 |
| 10405 | 970 STWGCTimer* _gc_timer_stw; |
| 971 ConcurrentGCTimer* _gc_timer_cm; | |
| 972 | |
| 973 G1OldTracer* _gc_tracer_cm; | |
| 974 G1NewTracer* _gc_tracer_stw; | |
| 975 | |
|
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976 // During reference object discovery, the _is_alive_non_header |
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977 // closure (if non-null) is applied to the referent object to |
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978 // determine whether the referent is live. If so then the |
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979 // reference object does not need to be 'discovered' and can |
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980 // be treated as a regular oop. This has the benefit of reducing |
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981 // the number of 'discovered' reference objects that need to |
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982 // be processed. |
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983 // |
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984 // Instance of the is_alive closure for embedding into the |
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985 // STW reference processor as the _is_alive_non_header field. |
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986 // Supplying a value for the _is_alive_non_header field is |
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987 // optional but doing so prevents unnecessary additions to |
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988 // the discovered lists during reference discovery. |
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989 G1STWIsAliveClosure _is_alive_closure_stw; |
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990 |
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991 // The (concurrent marking) reference processor... |
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992 ReferenceProcessor* _ref_processor_cm; |
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993 |
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994 // Instance of the concurrent mark is_alive closure for embedding |
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995 // into the Concurrent Marking reference processor as the |
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996 // _is_alive_non_header field. Supplying a value for the |
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997 // _is_alive_non_header field is optional but doing so prevents |
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998 // unnecessary additions to the discovered lists during reference |
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999 // discovery. |
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1000 G1CMIsAliveClosure _is_alive_closure_cm; |
| 342 | 1001 |
|
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1002 // Cache used by G1CollectedHeap::start_cset_region_for_worker(). |
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1003 HeapRegion** _worker_cset_start_region; |
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1004 |
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1005 // Time stamp to validate the regions recorded in the cache |
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1006 // used by G1CollectedHeap::start_cset_region_for_worker(). |
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1007 // The heap region entry for a given worker is valid iff |
|
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1008 // the associated time stamp value matches the current value |
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1009 // of G1CollectedHeap::_gc_time_stamp. |
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1010 unsigned int* _worker_cset_start_region_time_stamp; |
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1011 |
|
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1012 enum G1H_process_roots_tasks { |
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1013 G1H_PS_filter_satb_buffers, |
| 342 | 1014 G1H_PS_refProcessor_oops_do, |
| 1015 // Leave this one last. | |
| 1016 G1H_PS_NumElements | |
| 1017 }; | |
| 1018 | |
| 1019 SubTasksDone* _process_strong_tasks; | |
| 1020 | |
| 2152 | 1021 volatile bool _free_regions_coming; |
| 342 | 1022 |
| 1023 public: | |
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1024 |
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1025 SubTasksDone* process_strong_tasks() { return _process_strong_tasks; } |
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1026 |
| 342 | 1027 void set_refine_cte_cl_concurrency(bool concurrent); |
| 1028 | |
| 1709 | 1029 RefToScanQueue *task_queue(int i) const; |
| 342 | 1030 |
|
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1031 // A set of cards where updates happened during the GC |
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1032 DirtyCardQueueSet& dirty_card_queue_set() { return _dirty_card_queue_set; } |
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1033 |
| 1705 | 1034 // A DirtyCardQueueSet that is used to hold cards that contain |
| 1035 // references into the current collection set. This is used to | |
| 1036 // update the remembered sets of the regions in the collection | |
| 1037 // set in the event of an evacuation failure. | |
| 1038 DirtyCardQueueSet& into_cset_dirty_card_queue_set() | |
| 1039 { return _into_cset_dirty_card_queue_set; } | |
| 1040 | |
| 342 | 1041 // Create a G1CollectedHeap with the specified policy. |
| 1042 // Must call the initialize method afterwards. | |
| 1043 // May not return if something goes wrong. | |
| 1044 G1CollectedHeap(G1CollectorPolicy* policy); | |
| 1045 | |
| 1046 // Initialize the G1CollectedHeap to have the initial and | |
|
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1047 // maximum sizes and remembered and barrier sets |
| 342 | 1048 // specified by the policy object. |
| 1049 jint initialize(); | |
| 1050 | |
|
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1051 virtual void stop(); |
|
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1052 |
|
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1053 // Return the (conservative) maximum heap alignment for any G1 heap |
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1054 static size_t conservative_max_heap_alignment(); |
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1055 |
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1056 // Initialize weak reference processing. |
|
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1057 virtual void ref_processing_init(); |
| 342 | 1058 |
|
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1059 void set_par_threads(uint t) { |
| 342 | 1060 SharedHeap::set_par_threads(t); |
|
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1061 // Done in SharedHeap but oddly there are |
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1062 // two _process_strong_tasks's in a G1CollectedHeap |
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1063 // so do it here too. |
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1064 _process_strong_tasks->set_n_threads(t); |
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1065 } |
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1066 |
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1067 // Set _n_par_threads according to a policy TBD. |
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1068 void set_par_threads(); |
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1069 |
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1070 void set_n_termination(int t) { |
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1071 _process_strong_tasks->set_n_threads(t); |
| 342 | 1072 } |
| 1073 | |
| 1074 virtual CollectedHeap::Name kind() const { | |
| 1075 return CollectedHeap::G1CollectedHeap; | |
| 1076 } | |
| 1077 | |
| 1078 // The current policy object for the collector. | |
| 1079 G1CollectorPolicy* g1_policy() const { return _g1_policy; } | |
| 1080 | |
|
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1081 virtual CollectorPolicy* collector_policy() const { return (CollectorPolicy*) g1_policy(); } |
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1082 |
| 342 | 1083 // Adaptive size policy. No such thing for g1. |
| 1084 virtual AdaptiveSizePolicy* size_policy() { return NULL; } | |
| 1085 | |
| 1086 // The rem set and barrier set. | |
| 1087 G1RemSet* g1_rem_set() const { return _g1_rem_set; } | |
| 1088 | |
| 1089 unsigned get_gc_time_stamp() { | |
| 1090 return _gc_time_stamp; | |
| 1091 } | |
| 1092 | |
|
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1093 inline void reset_gc_time_stamp(); |
|
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|
1094 |
|
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1095 void check_gc_time_stamps() PRODUCT_RETURN; |
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1096 |
|
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1097 inline void increment_gc_time_stamp(); |
| 342 | 1098 |
|
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1099 // Reset the given region's GC timestamp. If it's starts humongous, |
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1100 // also reset the GC timestamp of its corresponding |
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1101 // continues humongous regions too. |
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1102 void reset_gc_time_stamps(HeapRegion* hr); |
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1103 |
| 1705 | 1104 void iterate_dirty_card_closure(CardTableEntryClosure* cl, |
| 1105 DirtyCardQueue* into_cset_dcq, | |
|
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1106 bool concurrent, uint worker_i); |
| 342 | 1107 |
| 1108 // The shared block offset table array. | |
| 1109 G1BlockOffsetSharedArray* bot_shared() const { return _bot_shared; } | |
| 1110 | |
|
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1111 // Reference Processing accessors |
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1112 |
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1113 // The STW reference processor.... |
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1114 ReferenceProcessor* ref_processor_stw() const { return _ref_processor_stw; } |
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1115 |
| 10405 | 1116 // The Concurrent Marking reference processor... |
|
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1117 ReferenceProcessor* ref_processor_cm() const { return _ref_processor_cm; } |
| 342 | 1118 |
| 10405 | 1119 ConcurrentGCTimer* gc_timer_cm() const { return _gc_timer_cm; } |
| 1120 G1OldTracer* gc_tracer_cm() const { return _gc_tracer_cm; } | |
| 1121 | |
| 342 | 1122 virtual size_t capacity() const; |
| 1123 virtual size_t used() const; | |
|
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1124 // This should be called when we're not holding the heap lock. The |
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1125 // result might be a bit inaccurate. |
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1126 size_t used_unlocked() const; |
| 342 | 1127 size_t recalculate_used() const; |
| 1128 | |
| 1129 // These virtual functions do the actual allocation. | |
| 1130 // Some heaps may offer a contiguous region for shared non-blocking | |
| 1131 // allocation, via inlined code (by exporting the address of the top and | |
| 1132 // end fields defining the extent of the contiguous allocation region.) | |
| 1133 // But G1CollectedHeap doesn't yet support this. | |
| 1134 | |
| 1135 virtual bool is_maximal_no_gc() const { | |
|
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1136 return _hrm.available() == 0; |
| 342 | 1137 } |
| 1138 | |
|
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1139 // The current number of regions in the heap. |
|
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1140 uint num_regions() const { return _hrm.length(); } |
| 3766 | 1141 |
| 1142 // The max number of regions in the heap. | |
|
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1143 uint max_regions() const { return _hrm.max_length(); } |
| 342 | 1144 |
| 1145 // The number of regions that are completely free. | |
|
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1146 uint num_free_regions() const { return _hrm.num_free_regions(); } |
| 342 | 1147 |
| 1148 // The number of regions that are not completely free. | |
|
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1149 uint num_used_regions() const { return num_regions() - num_free_regions(); } |
| 3766 | 1150 |
|
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1151 void verify_not_dirty_region(HeapRegion* hr) PRODUCT_RETURN; |
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1152 void verify_dirty_region(HeapRegion* hr) PRODUCT_RETURN; |
|
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1153 void verify_dirty_young_list(HeapRegion* head) PRODUCT_RETURN; |
|
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1154 void verify_dirty_young_regions() PRODUCT_RETURN; |
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1155 |
|
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1156 #ifndef PRODUCT |
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1157 // Make sure that the given bitmap has no marked objects in the |
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1158 // range [from,limit). If it does, print an error message and return |
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1159 // false. Otherwise, just return true. bitmap_name should be "prev" |
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1160 // or "next". |
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1161 bool verify_no_bits_over_tams(const char* bitmap_name, CMBitMapRO* bitmap, |
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1162 HeapWord* from, HeapWord* limit); |
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1163 |
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1164 // Verify that the prev / next bitmap range [tams,end) for the given |
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1165 // region has no marks. Return true if all is well, false if errors |
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1166 // are detected. |
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1167 bool verify_bitmaps(const char* caller, HeapRegion* hr); |
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1168 #endif // PRODUCT |
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1169 |
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1170 // If G1VerifyBitmaps is set, verify that the marking bitmaps for |
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1171 // the given region do not have any spurious marks. If errors are |
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1172 // detected, print appropriate error messages and crash. |
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1173 void check_bitmaps(const char* caller, HeapRegion* hr) PRODUCT_RETURN; |
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1174 |
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1175 // If G1VerifyBitmaps is set, verify that the marking bitmaps do not |
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1176 // have any spurious marks. If errors are detected, print |
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1177 // appropriate error messages and crash. |
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1178 void check_bitmaps(const char* caller) PRODUCT_RETURN; |
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1179 |
| 2152 | 1180 // verify_region_sets() performs verification over the region |
| 1181 // lists. It will be compiled in the product code to be used when | |
| 1182 // necessary (i.e., during heap verification). | |
| 1183 void verify_region_sets(); | |
| 342 | 1184 |
| 2152 | 1185 // verify_region_sets_optional() is planted in the code for |
| 1186 // list verification in non-product builds (and it can be enabled in | |
| 10405 | 1187 // product builds by defining HEAP_REGION_SET_FORCE_VERIFY to be 1). |
| 2152 | 1188 #if HEAP_REGION_SET_FORCE_VERIFY |
| 1189 void verify_region_sets_optional() { | |
| 1190 verify_region_sets(); | |
| 1191 } | |
| 1192 #else // HEAP_REGION_SET_FORCE_VERIFY | |
| 1193 void verify_region_sets_optional() { } | |
| 1194 #endif // HEAP_REGION_SET_FORCE_VERIFY | |
| 342 | 1195 |
| 2152 | 1196 #ifdef ASSERT |
| 2361 | 1197 bool is_on_master_free_list(HeapRegion* hr) { |
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1198 return _hrm.is_free(hr); |
| 2152 | 1199 } |
| 1200 #endif // ASSERT | |
| 342 | 1201 |
| 2152 | 1202 // Wrapper for the region list operations that can be called from |
| 1203 // methods outside this class. | |
| 342 | 1204 |
|
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1205 void secondary_free_list_add(FreeRegionList* list) { |
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1206 _secondary_free_list.add_ordered(list); |
| 2152 | 1207 } |
| 342 | 1208 |
| 2152 | 1209 void append_secondary_free_list() { |
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1210 _hrm.insert_list_into_free_list(&_secondary_free_list); |
| 2152 | 1211 } |
| 342 | 1212 |
| 2361 | 1213 void append_secondary_free_list_if_not_empty_with_lock() { |
| 1214 // If the secondary free list looks empty there's no reason to | |
| 1215 // take the lock and then try to append it. | |
| 2152 | 1216 if (!_secondary_free_list.is_empty()) { |
| 1217 MutexLockerEx x(SecondaryFreeList_lock, Mutex::_no_safepoint_check_flag); | |
| 1218 append_secondary_free_list(); | |
| 1219 } | |
| 1220 } | |
| 342 | 1221 |
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1222 inline void old_set_remove(HeapRegion* hr); |
| 4072 | 1223 |
|
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1224 size_t non_young_capacity_bytes() { |
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1225 return _old_set.total_capacity_bytes() + _humongous_set.total_capacity_bytes(); |
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1226 } |
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1227 |
| 2152 | 1228 void set_free_regions_coming(); |
| 1229 void reset_free_regions_coming(); | |
| 1230 bool free_regions_coming() { return _free_regions_coming; } | |
| 1231 void wait_while_free_regions_coming(); | |
| 342 | 1232 |
|
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1233 // Determine whether the given region is one that we are using as an |
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1234 // old GC alloc region. |
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1235 bool is_old_gc_alloc_region(HeapRegion* hr) { |
|
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1236 return _allocator->is_retained_old_region(hr); |
|
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1237 } |
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1238 |
| 342 | 1239 // Perform a collection of the heap; intended for use in implementing |
| 1240 // "System.gc". This probably implies as full a collection as the | |
| 1241 // "CollectedHeap" supports. | |
| 1242 virtual void collect(GCCause::Cause cause); | |
| 1243 | |
| 1244 // The same as above but assume that the caller holds the Heap_lock. | |
| 1245 void collect_locked(GCCause::Cause cause); | |
| 1246 | |
| 10405 | 1247 // True iff an evacuation has failed in the most-recent collection. |
| 342 | 1248 bool evacuation_failed() { return _evacuation_failed; } |
| 1249 | |
|
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1250 void remove_from_old_sets(const HeapRegionSetCount& old_regions_removed, const HeapRegionSetCount& humongous_regions_removed); |
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1251 void prepend_to_freelist(FreeRegionList* list); |
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1252 void decrement_summary_bytes(size_t bytes); |
| 342 | 1253 |
| 4708 | 1254 // Returns "TRUE" iff "p" points into the committed areas of the heap. |
| 342 | 1255 virtual bool is_in(const void* p) const; |
| 20337 | 1256 #ifdef ASSERT |
| 1257 // Returns whether p is in one of the available areas of the heap. Slow but | |
| 1258 // extensive version. | |
| 1259 bool is_in_exact(const void* p) const; | |
| 1260 #endif | |
| 342 | 1261 |
| 1262 // Return "TRUE" iff the given object address is within the collection | |
|
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1263 // set. Slow implementation. |
| 342 | 1264 inline bool obj_in_cs(oop obj); |
| 1265 | |
|
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1266 inline bool is_in_cset(oop obj); |
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1267 |
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1268 inline bool is_in_cset_or_humongous(const oop obj); |
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1269 |
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1270 enum in_cset_state_t { |
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1271 InNeither, // neither in collection set nor humongous |
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1272 InCSet, // region is in collection set only |
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1273 IsHumongous // region is a humongous start region |
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1274 }; |
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1275 private: |
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1276 // Instances of this class are used for quick tests on whether a reference points |
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1277 // into the collection set or is a humongous object (points into a humongous |
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1278 // object). |
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1279 // Each of the array's elements denotes whether the corresponding region is in |
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1280 // the collection set or a humongous region. |
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1281 // We use this to quickly reclaim humongous objects: by making a humongous region |
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1282 // succeed this test, we sort-of add it to the collection set. During the reference |
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1283 // iteration closures, when we see a humongous region, we simply mark it as |
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1284 // referenced, i.e. live. |
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1285 class G1FastCSetBiasedMappedArray : public G1BiasedMappedArray<char> { |
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1286 protected: |
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1287 char default_value() const { return G1CollectedHeap::InNeither; } |
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1288 public: |
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1289 void set_humongous(uintptr_t index) { |
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1290 assert(get_by_index(index) != InCSet, "Should not overwrite InCSet values"); |
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1291 set_by_index(index, G1CollectedHeap::IsHumongous); |
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1292 } |
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1293 |
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1294 void clear_humongous(uintptr_t index) { |
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1295 set_by_index(index, G1CollectedHeap::InNeither); |
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1296 } |
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1297 |
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1298 void set_in_cset(uintptr_t index) { |
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1299 assert(get_by_index(index) != G1CollectedHeap::IsHumongous, "Should not overwrite IsHumongous value"); |
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1300 set_by_index(index, G1CollectedHeap::InCSet); |
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1301 } |
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1302 |
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1303 bool is_in_cset_or_humongous(HeapWord* addr) const { return get_by_address(addr) != G1CollectedHeap::InNeither; } |
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1304 bool is_in_cset(HeapWord* addr) const { return get_by_address(addr) == G1CollectedHeap::InCSet; } |
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1305 G1CollectedHeap::in_cset_state_t at(HeapWord* addr) const { return (G1CollectedHeap::in_cset_state_t)get_by_address(addr); } |
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1306 void clear() { G1BiasedMappedArray<char>::clear(); } |
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1307 }; |
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1308 |
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1309 // This array is used for a quick test on whether a reference points into |
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1310 // the collection set or not. Each of the array's elements denotes whether the |
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1311 // corresponding region is in the collection set or not. |
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1312 G1FastCSetBiasedMappedArray _in_cset_fast_test; |
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1313 |
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1314 public: |
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1315 |
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1316 inline in_cset_state_t in_cset_state(const oop obj); |
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1317 |
| 342 | 1318 // Return "TRUE" iff the given object address is in the reserved |
|
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1319 // region of g1. |
| 342 | 1320 bool is_in_g1_reserved(const void* p) const { |
|
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1321 return _hrm.reserved().contains(p); |
| 342 | 1322 } |
| 1323 | |
|
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1324 // Returns a MemRegion that corresponds to the space that has been |
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1325 // reserved for the heap |
|
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1326 MemRegion g1_reserved() const { |
|
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1327 return _hrm.reserved(); |
|
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1328 } |
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|
1329 |
| 2311 | 1330 virtual bool is_in_closed_subset(const void* p) const; |
| 342 | 1331 |
| 20337 | 1332 G1SATBCardTableLoggingModRefBS* g1_barrier_set() { |
| 1333 return (G1SATBCardTableLoggingModRefBS*) barrier_set(); | |
| 12343 | 1334 } |
| 1335 | |
| 342 | 1336 // This resets the card table to all zeros. It is used after |
| 1337 // a collection pause which used the card table to claim cards. | |
| 1338 void cleanUpCardTable(); | |
| 1339 | |
| 1340 // Iteration functions. | |
| 1341 | |
| 1342 // Iterate over all the ref-containing fields of all objects, calling | |
| 1343 // "cl.do_oop" on each. | |
|
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|
1344 virtual void oop_iterate(ExtendedOopClosure* cl); |
| 342 | 1345 |
| 1346 // Iterate over all objects, calling "cl.do_object" on each. | |
|
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1347 virtual void object_iterate(ObjectClosure* cl); |
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1348 |
| 678 | 1349 virtual void safe_object_iterate(ObjectClosure* cl) { |
|
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1350 object_iterate(cl); |
| 678 | 1351 } |
| 342 | 1352 |
| 1353 // Iterate over all spaces in use in the heap, in ascending address order. | |
| 1354 virtual void space_iterate(SpaceClosure* cl); | |
| 1355 | |
| 1356 // Iterate over heap regions, in address order, terminating the | |
| 1357 // iteration early if the "doHeapRegion" method returns "true". | |
| 3766 | 1358 void heap_region_iterate(HeapRegionClosure* blk) const; |
| 342 | 1359 |
| 3766 | 1360 // Return the region with the given index. It assumes the index is valid. |
|
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1361 inline HeapRegion* region_at(uint index) const; |
| 342 | 1362 |
|
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1363 // Calculate the region index of the given address. Given address must be |
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1364 // within the heap. |
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1365 inline uint addr_to_region(HeapWord* addr) const; |
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1366 |
|
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|
1367 inline HeapWord* bottom_addr_for_region(uint index) const; |
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1368 |
| 342 | 1369 // Divide the heap region sequence into "chunks" of some size (the number |
| 1370 // of regions divided by the number of parallel threads times some | |
| 1371 // overpartition factor, currently 4). Assumes that this will be called | |
| 1372 // in parallel by ParallelGCThreads worker threads with discinct worker | |
| 1373 // ids in the range [0..max(ParallelGCThreads-1, 1)], that all parallel | |
| 1374 // calls will use the same "claim_value", and that that claim value is | |
| 1375 // different from the claim_value of any heap region before the start of | |
| 1376 // the iteration. Applies "blk->doHeapRegion" to each of the regions, by | |
| 1377 // attempting to claim the first region in each chunk, and, if | |
| 1378 // successful, applying the closure to each region in the chunk (and | |
| 1379 // setting the claim value of the second and subsequent regions of the | |
| 1380 // chunk.) For now requires that "doHeapRegion" always returns "false", | |
| 1381 // i.e., that a closure never attempt to abort a traversal. | |
|
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1382 void heap_region_par_iterate_chunked(HeapRegionClosure* cl, |
|
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1383 uint worker_id, |
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1384 uint num_workers, |
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|
1385 jint claim_value) const; |
| 342 | 1386 |
| 390 | 1387 // It resets all the region claim values to the default. |
| 1388 void reset_heap_region_claim_values(); | |
| 1389 | |
|
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1390 // Resets the claim values of regions in the current |
|
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1391 // collection set to the default. |
|
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|
1392 void reset_cset_heap_region_claim_values(); |
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1393 |
| 355 | 1394 #ifdef ASSERT |
| 1395 bool check_heap_region_claim_values(jint claim_value); | |
|
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1396 |
|
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1397 // Same as the routine above but only checks regions in the |
|
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1398 // current collection set. |
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1399 bool check_cset_heap_region_claim_values(jint claim_value); |
| 355 | 1400 #endif // ASSERT |
| 1401 | |
|
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1402 // Clear the cached cset start regions and (more importantly) |
|
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1403 // the time stamps. Called when we reset the GC time stamp. |
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1404 void clear_cset_start_regions(); |
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1405 |
|
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1406 // Given the id of a worker, obtain or calculate a suitable |
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1407 // starting region for iterating over the current collection set. |
|
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1408 HeapRegion* start_cset_region_for_worker(uint worker_i); |
|
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1409 |
| 342 | 1410 // Iterate over the regions (if any) in the current collection set. |
| 1411 void collection_set_iterate(HeapRegionClosure* blk); | |
| 1412 | |
| 1413 // As above but starting from region r | |
| 1414 void collection_set_iterate_from(HeapRegion* r, HeapRegionClosure *blk); | |
| 1415 | |
|
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1416 HeapRegion* next_compaction_region(const HeapRegion* from) const; |
| 342 | 1417 |
| 1418 // A CollectedHeap will contain some number of spaces. This finds the | |
| 1419 // space containing a given address, or else returns NULL. | |
| 1420 virtual Space* space_containing(const void* addr) const; | |
| 1421 | |
|
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1422 // Returns the HeapRegion that contains addr. addr must not be NULL. |
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1423 template <class T> |
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1424 inline HeapRegion* heap_region_containing_raw(const T addr) const; |
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1425 |
|
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1426 // Returns the HeapRegion that contains addr. addr must not be NULL. |
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1427 // If addr is within a humongous continues region, it returns its humongous start region. |
| 3766 | 1428 template <class T> |
| 1429 inline HeapRegion* heap_region_containing(const T addr) const; | |
| 342 | 1430 |
| 1431 // A CollectedHeap is divided into a dense sequence of "blocks"; that is, | |
| 1432 // each address in the (reserved) heap is a member of exactly | |
| 1433 // one block. The defining characteristic of a block is that it is | |
| 1434 // possible to find its size, and thus to progress forward to the next | |
| 1435 // block. (Blocks may be of different sizes.) Thus, blocks may | |
| 1436 // represent Java objects, or they might be free blocks in a | |
| 1437 // free-list-based heap (or subheap), as long as the two kinds are | |
| 1438 // distinguishable and the size of each is determinable. | |
| 1439 | |
| 1440 // Returns the address of the start of the "block" that contains the | |
| 1441 // address "addr". We say "blocks" instead of "object" since some heaps | |
| 1442 // may not pack objects densely; a chunk may either be an object or a | |
| 1443 // non-object. | |
| 1444 virtual HeapWord* block_start(const void* addr) const; | |
| 1445 | |
| 1446 // Requires "addr" to be the start of a chunk, and returns its size. | |
| 1447 // "addr + size" is required to be the start of a new chunk, or the end | |
| 1448 // of the active area of the heap. | |
| 1449 virtual size_t block_size(const HeapWord* addr) const; | |
| 1450 | |
| 1451 // Requires "addr" to be the start of a block, and returns "TRUE" iff | |
| 1452 // the block is an object. | |
| 1453 virtual bool block_is_obj(const HeapWord* addr) const; | |
| 1454 | |
| 1455 // Does this heap support heap inspection? (+PrintClassHistogram) | |
| 1456 virtual bool supports_heap_inspection() const { return true; } | |
| 1457 | |
| 1458 // Section on thread-local allocation buffers (TLABs) | |
| 1459 // See CollectedHeap for semantics. | |
| 1460 | |
| 17727 | 1461 bool supports_tlab_allocation() const; |
| 1462 size_t tlab_capacity(Thread* ignored) const; | |
| 1463 size_t tlab_used(Thread* ignored) const; | |
| 1464 size_t max_tlab_size() const; | |
| 1465 size_t unsafe_max_tlab_alloc(Thread* ignored) const; | |
| 342 | 1466 |
| 1467 // Can a compiler initialize a new object without store barriers? | |
| 1468 // This permission only extends from the creation of a new object | |
|
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1469 // via a TLAB up to the first subsequent safepoint. If such permission |
|
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1470 // is granted for this heap type, the compiler promises to call |
|
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|
1471 // defer_store_barrier() below on any slow path allocation of |
|
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1472 // a new object for which such initializing store barriers will |
|
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1473 // have been elided. G1, like CMS, allows this, but should be |
|
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|
1474 // ready to provide a compensating write barrier as necessary |
|
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|
1475 // if that storage came out of a non-young region. The efficiency |
|
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1476 // of this implementation depends crucially on being able to |
|
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|
1477 // answer very efficiently in constant time whether a piece of |
|
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|
1478 // storage in the heap comes from a young region or not. |
|
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|
1479 // See ReduceInitialCardMarks. |
| 342 | 1480 virtual bool can_elide_tlab_store_barriers() const { |
|
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1481 return true; |
|
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|
1482 } |
|
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|
1483 |
| 1166 | 1484 virtual bool card_mark_must_follow_store() const { |
| 1485 return true; | |
| 1486 } | |
| 1487 | |
|
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1488 inline bool is_in_young(const oop obj); |
|
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|
1489 |
|
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1490 #ifdef ASSERT |
|
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|
1491 virtual bool is_in_partial_collection(const void* p); |
|
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1492 #endif |
|
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|
1493 |
|
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|
1494 virtual bool is_scavengable(const void* addr); |
|
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1495 |
|
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|
1496 // We don't need barriers for initializing stores to objects |
|
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|
1497 // in the young gen: for the SATB pre-barrier, there is no |
|
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1498 // pre-value that needs to be remembered; for the remembered-set |
|
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1499 // update logging post-barrier, we don't maintain remembered set |
|
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1500 // information for young gen objects. |
|
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|
1501 virtual inline bool can_elide_initializing_store_barrier(oop new_obj); |
| 342 | 1502 |
| 1503 // Returns "true" iff the given word_size is "very large". | |
| 1504 static bool isHumongous(size_t word_size) { | |
|
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1505 // Note this has to be strictly greater-than as the TLABs |
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1506 // are capped at the humongous thresold and we want to |
|
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1507 // ensure that we don't try to allocate a TLAB as |
|
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1508 // humongous and that we don't allocate a humongous |
|
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1509 // object in a TLAB. |
|
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|
1510 return word_size > _humongous_object_threshold_in_words; |
| 342 | 1511 } |
| 1512 | |
| 1513 // Update mod union table with the set of dirty cards. | |
| 1514 void updateModUnion(); | |
| 1515 | |
| 1516 // Set the mod union bits corresponding to the given memRegion. Note | |
| 1517 // that this is always a safe operation, since it doesn't clear any | |
| 1518 // bits. | |
| 1519 void markModUnionRange(MemRegion mr); | |
| 1520 | |
| 1521 // Records the fact that a marking phase is no longer in progress. | |
| 1522 void set_marking_complete() { | |
| 1523 _mark_in_progress = false; | |
| 1524 } | |
| 1525 void set_marking_started() { | |
| 1526 _mark_in_progress = true; | |
| 1527 } | |
| 1528 bool mark_in_progress() { | |
| 1529 return _mark_in_progress; | |
| 1530 } | |
| 1531 | |
| 1532 // Print the maximum heap capacity. | |
| 1533 virtual size_t max_capacity() const; | |
| 1534 | |
| 1535 virtual jlong millis_since_last_gc(); | |
| 1536 | |
|
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|
1537 |
| 342 | 1538 // Convenience function to be used in situations where the heap type can be |
| 1539 // asserted to be this type. | |
| 1540 static G1CollectedHeap* heap(); | |
| 1541 | |
| 1542 void set_region_short_lived_locked(HeapRegion* hr); | |
| 1543 // add appropriate methods for any other surv rate groups | |
| 1544 | |
| 17727 | 1545 YoungList* young_list() const { return _young_list; } |
| 342 | 1546 |
| 1547 // debugging | |
| 1548 bool check_young_list_well_formed() { | |
| 1549 return _young_list->check_list_well_formed(); | |
| 1550 } | |
|
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1551 |
|
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|
1552 bool check_young_list_empty(bool check_heap, |
| 342 | 1553 bool check_sample = true); |
| 1554 | |
| 1555 // *** Stuff related to concurrent marking. It's not clear to me that so | |
| 1556 // many of these need to be public. | |
| 1557 | |
| 1558 // The functions below are helper functions that a subclass of | |
| 1559 // "CollectedHeap" can use in the implementation of its virtual | |
| 1560 // functions. | |
| 1561 // This performs a concurrent marking of the live objects in a | |
| 1562 // bitmap off to the side. | |
| 1563 void doConcurrentMark(); | |
| 1564 | |
| 1565 bool isMarkedPrev(oop obj) const; | |
| 1566 bool isMarkedNext(oop obj) const; | |
| 1567 | |
| 1568 // Determine if an object is dead, given the object and also | |
| 1569 // the region to which the object belongs. An object is dead | |
| 1570 // iff a) it was not allocated since the last mark and b) it | |
| 1571 // is not marked. | |
| 1572 bool is_obj_dead(const oop obj, const HeapRegion* hr) const { | |
| 1573 return | |
| 1574 !hr->obj_allocated_since_prev_marking(obj) && | |
| 1575 !isMarkedPrev(obj); | |
| 1576 } | |
| 1577 | |
| 1578 // This function returns true when an object has been | |
| 1579 // around since the previous marking and hasn't yet | |
| 1580 // been marked during this marking. | |
| 1581 bool is_obj_ill(const oop obj, const HeapRegion* hr) const { | |
| 1582 return | |
| 1583 !hr->obj_allocated_since_next_marking(obj) && | |
| 1584 !isMarkedNext(obj); | |
| 1585 } | |
| 1586 | |
| 1587 // Determine if an object is dead, given only the object itself. | |
| 1588 // This will find the region to which the object belongs and | |
| 1589 // then call the region version of the same function. | |
| 1590 | |
| 1591 // Added if it is NULL it isn't dead. | |
| 1592 | |
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1593 inline bool is_obj_dead(const oop obj) const; |
| 342 | 1594 |
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1595 inline bool is_obj_ill(const oop obj) const; |
| 342 | 1596 |
| 12080 | 1597 bool allocated_since_marking(oop obj, HeapRegion* hr, VerifyOption vo); |
| 1598 HeapWord* top_at_mark_start(HeapRegion* hr, VerifyOption vo); | |
| 1599 bool is_marked(oop obj, VerifyOption vo); | |
| 1600 const char* top_at_mark_start_str(VerifyOption vo); | |
| 1601 | |
| 1602 ConcurrentMark* concurrent_mark() const { return _cm; } | |
| 1603 | |
| 1604 // Refinement | |
| 1605 | |
| 1606 ConcurrentG1Refine* concurrent_g1_refine() const { return _cg1r; } | |
| 1607 | |
| 1608 // The dirty cards region list is used to record a subset of regions | |
| 1609 // whose cards need clearing. The list if populated during the | |
| 1610 // remembered set scanning and drained during the card table | |
| 1611 // cleanup. Although the methods are reentrant, population/draining | |
| 1612 // phases must not overlap. For synchronization purposes the last | |
| 1613 // element on the list points to itself. | |
| 1614 HeapRegion* _dirty_cards_region_list; | |
| 1615 void push_dirty_cards_region(HeapRegion* hr); | |
| 1616 HeapRegion* pop_dirty_cards_region(); | |
| 1617 | |
| 1618 // Optimized nmethod scanning support routines | |
| 1619 | |
| 1620 // Register the given nmethod with the G1 heap | |
| 1621 virtual void register_nmethod(nmethod* nm); | |
| 1622 | |
| 1623 // Unregister the given nmethod from the G1 heap | |
| 1624 virtual void unregister_nmethod(nmethod* nm); | |
| 1625 | |
| 1626 // Migrate the nmethods in the code root lists of the regions | |
| 1627 // in the collection set to regions in to-space. In the event | |
| 1628 // of an evacuation failure, nmethods that reference objects | |
| 1629 // that were not successfullly evacuated are not migrated. | |
| 1630 void migrate_strong_code_roots(); | |
| 1631 | |
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1632 // Free up superfluous code root memory. |
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1633 void purge_code_root_memory(); |
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1634 |
| 12080 | 1635 // Rebuild the stong code root lists for each region |
| 1636 // after a full GC | |
| 1637 void rebuild_strong_code_roots(); | |
| 1638 | |
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1639 // Delete entries for dead interned string and clean up unreferenced symbols |
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1640 // in symbol table, possibly in parallel. |
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1641 void unlink_string_and_symbol_table(BoolObjectClosure* is_alive, bool unlink_strings = true, bool unlink_symbols = true); |
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1642 |
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1643 // Parallel phase of unloading/cleaning after G1 concurrent mark. |
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1644 void parallel_cleaning(BoolObjectClosure* is_alive, bool process_strings, bool process_symbols, bool class_unloading_occurred); |
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1645 |
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1646 // Redirty logged cards in the refinement queue. |
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1647 void redirty_logged_cards(); |
| 12080 | 1648 // Verification |
| 1649 | |
| 1650 // The following is just to alert the verification code | |
| 1651 // that a full collection has occurred and that the | |
| 1652 // remembered sets are no longer up to date. | |
| 1653 bool _full_collection; | |
| 1654 void set_full_collection() { _full_collection = true;} | |
| 1655 void clear_full_collection() {_full_collection = false;} | |
| 1656 bool full_collection() {return _full_collection;} | |
| 1657 | |
| 1658 // Perform any cleanup actions necessary before allowing a verification. | |
| 1659 virtual void prepare_for_verify(); | |
| 1660 | |
| 1661 // Perform verification. | |
| 1662 | |
| 1663 // vo == UsePrevMarking -> use "prev" marking information, | |
| 1664 // vo == UseNextMarking -> use "next" marking information | |
| 1665 // vo == UseMarkWord -> use the mark word in the object header | |
| 1666 // | |
| 1667 // NOTE: Only the "prev" marking information is guaranteed to be | |
| 1668 // consistent most of the time, so most calls to this should use | |
| 1669 // vo == UsePrevMarking. | |
| 1670 // Currently, there is only one case where this is called with | |
| 1671 // vo == UseNextMarking, which is to verify the "next" marking | |
| 1672 // information at the end of remark. | |
| 1673 // Currently there is only one place where this is called with | |
| 1674 // vo == UseMarkWord, which is to verify the marking during a | |
| 1675 // full GC. | |
| 1676 void verify(bool silent, VerifyOption vo); | |
| 1677 | |
| 1678 // Override; it uses the "prev" marking information | |
| 1679 virtual void verify(bool silent); | |
| 1680 | |
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1681 // The methods below are here for convenience and dispatch the |
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1682 // appropriate method depending on value of the given VerifyOption |
| 12080 | 1683 // parameter. The values for that parameter, and their meanings, |
| 1684 // are the same as those above. | |
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1685 |
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1686 bool is_obj_dead_cond(const oop obj, |
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1687 const HeapRegion* hr, |
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1688 const VerifyOption vo) const; |
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1689 |
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1690 bool is_obj_dead_cond(const oop obj, |
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1691 const VerifyOption vo) const; |
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1692 |
| 12080 | 1693 // Printing |
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1694 |
| 12080 | 1695 virtual void print_on(outputStream* st) const; |
| 1696 virtual void print_extended_on(outputStream* st) const; | |
| 1697 virtual void print_on_error(outputStream* st) const; | |
| 342 | 1698 |
| 12080 | 1699 virtual void print_gc_threads_on(outputStream* st) const; |
| 1700 virtual void gc_threads_do(ThreadClosure* tc) const; | |
| 342 | 1701 |
| 12080 | 1702 // Override |
| 1703 void print_tracing_info() const; | |
| 1704 | |
| 1705 // The following two methods are helpful for debugging RSet issues. | |
| 1706 void print_cset_rsets() PRODUCT_RETURN; | |
| 1707 void print_all_rsets() PRODUCT_RETURN; | |
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1708 |
| 342 | 1709 public: |
| 1710 size_t pending_card_num(); | |
| 1711 size_t cards_scanned(); | |
| 1712 | |
| 1713 protected: | |
| 1714 size_t _max_heap_capacity; | |
| 1715 }; | |
| 1716 | |
| 1972 | 1717 #endif // SHARE_VM_GC_IMPLEMENTATION_G1_G1COLLECTEDHEAP_HPP |