Mercurial > hg > graal-compiler
annotate src/share/vm/gc_implementation/g1/g1CollectedHeap.hpp @ 20215:983092f35ff7
8028710: G1 does not retire allocation buffers after reference processing work
Summary: G1 does not retire allocation buffers after reference processing work when -XX:+ParallelRefProcEnabled is enabled. This causes wrong calculation of PLAB sizes, as the amount of space wasted is not updated correctly.
Reviewed-by: brutisso
author | tschatzl |
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date | Mon, 21 Jul 2014 09:40:19 +0200 |
parents | d7e2d5f2846b |
children | b0c374311c4e |
rev | line source |
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342 | 1 /* |
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2 * Copyright (c) 2001, 2014, Oracle and/or its affiliates. All rights reserved. |
342 | 3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
4 * | |
5 * This code is free software; you can redistribute it and/or modify it | |
6 * under the terms of the GNU General Public License version 2 only, as | |
7 * published by the Free Software Foundation. | |
8 * | |
9 * This code is distributed in the hope that it will be useful, but WITHOUT | |
10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or | |
11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License | |
12 * version 2 for more details (a copy is included in the LICENSE file that | |
13 * accompanied this code). | |
14 * | |
15 * You should have received a copy of the GNU General Public License version | |
16 * 2 along with this work; if not, write to the Free Software Foundation, | |
17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. | |
18 * | |
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19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
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20 * or visit www.oracle.com if you need additional information or have any |
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21 * questions. |
342 | 22 * |
23 */ | |
24 | |
1972 | 25 #ifndef SHARE_VM_GC_IMPLEMENTATION_G1_G1COLLECTEDHEAP_HPP |
26 #define SHARE_VM_GC_IMPLEMENTATION_G1_G1COLLECTEDHEAP_HPP | |
27 | |
28 #include "gc_implementation/g1/concurrentMark.hpp" | |
10405 | 29 #include "gc_implementation/g1/evacuationInfo.hpp" |
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30 #include "gc_implementation/g1/g1AllocRegion.hpp" |
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31 #include "gc_implementation/g1/g1BiasedArray.hpp" |
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32 #include "gc_implementation/g1/g1HRPrinter.hpp" |
10405 | 33 #include "gc_implementation/g1/g1MonitoringSupport.hpp" |
1972 | 34 #include "gc_implementation/g1/g1RemSet.hpp" |
12343 | 35 #include "gc_implementation/g1/g1SATBCardTableModRefBS.hpp" |
10405 | 36 #include "gc_implementation/g1/g1YCTypes.hpp" |
3766 | 37 #include "gc_implementation/g1/heapRegionSeq.hpp" |
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38 #include "gc_implementation/g1/heapRegionSet.hpp" |
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39 #include "gc_implementation/shared/hSpaceCounters.hpp" |
6595 | 40 #include "gc_implementation/shared/parGCAllocBuffer.hpp" |
1972 | 41 #include "memory/barrierSet.hpp" |
42 #include "memory/memRegion.hpp" | |
43 #include "memory/sharedHeap.hpp" | |
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44 #include "utilities/stack.hpp" |
1972 | 45 |
342 | 46 // A "G1CollectedHeap" is an implementation of a java heap for HotSpot. |
47 // It uses the "Garbage First" heap organization and algorithm, which | |
48 // may combine concurrent marking with parallel, incremental compaction of | |
49 // heap subsets that will yield large amounts of garbage. | |
50 | |
12080 | 51 // Forward declarations |
342 | 52 class HeapRegion; |
2173 | 53 class HRRSCleanupTask; |
342 | 54 class GenerationSpec; |
55 class OopsInHeapRegionClosure; | |
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56 class G1KlassScanClosure; |
342 | 57 class G1ScanHeapEvacClosure; |
58 class ObjectClosure; | |
59 class SpaceClosure; | |
60 class CompactibleSpaceClosure; | |
61 class Space; | |
62 class G1CollectorPolicy; | |
63 class GenRemSet; | |
64 class G1RemSet; | |
65 class HeapRegionRemSetIterator; | |
66 class ConcurrentMark; | |
67 class ConcurrentMarkThread; | |
68 class ConcurrentG1Refine; | |
10405 | 69 class ConcurrentGCTimer; |
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70 class GenerationCounters; |
10405 | 71 class STWGCTimer; |
72 class G1NewTracer; | |
73 class G1OldTracer; | |
74 class EvacuationFailedInfo; | |
12080 | 75 class nmethod; |
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76 class Ticks; |
342 | 77 |
6197 | 78 typedef OverflowTaskQueue<StarTask, mtGC> RefToScanQueue; |
79 typedef GenericTaskQueueSet<RefToScanQueue, mtGC> RefToScanQueueSet; | |
342 | 80 |
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81 typedef int RegionIdx_t; // needs to hold [ 0..max_regions() ) |
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82 typedef int CardIdx_t; // needs to hold [ 0..CardsPerRegion ) |
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83 |
342 | 84 enum GCAllocPurpose { |
85 GCAllocForTenured, | |
86 GCAllocForSurvived, | |
87 GCAllocPurposeCount | |
88 }; | |
89 | |
6197 | 90 class YoungList : public CHeapObj<mtGC> { |
342 | 91 private: |
92 G1CollectedHeap* _g1h; | |
93 | |
94 HeapRegion* _head; | |
95 | |
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96 HeapRegion* _survivor_head; |
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97 HeapRegion* _survivor_tail; |
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98 |
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99 HeapRegion* _curr; |
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100 |
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101 uint _length; |
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102 uint _survivor_length; |
342 | 103 |
104 size_t _last_sampled_rs_lengths; | |
105 size_t _sampled_rs_lengths; | |
106 | |
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107 void empty_list(HeapRegion* list); |
342 | 108 |
109 public: | |
110 YoungList(G1CollectedHeap* g1h); | |
111 | |
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112 void push_region(HeapRegion* hr); |
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113 void add_survivor_region(HeapRegion* hr); |
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114 |
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115 void empty_list(); |
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116 bool is_empty() { return _length == 0; } |
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117 uint length() { return _length; } |
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118 uint survivor_length() { return _survivor_length; } |
342 | 119 |
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120 // Currently we do not keep track of the used byte sum for the |
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121 // young list and the survivors and it'd be quite a lot of work to |
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122 // do so. When we'll eventually replace the young list with |
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123 // instances of HeapRegionLinkedList we'll get that for free. So, |
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124 // we'll report the more accurate information then. |
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125 size_t eden_used_bytes() { |
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126 assert(length() >= survivor_length(), "invariant"); |
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127 return (size_t) (length() - survivor_length()) * HeapRegion::GrainBytes; |
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128 } |
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129 size_t survivor_used_bytes() { |
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130 return (size_t) survivor_length() * HeapRegion::GrainBytes; |
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131 } |
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132 |
342 | 133 void rs_length_sampling_init(); |
134 bool rs_length_sampling_more(); | |
135 void rs_length_sampling_next(); | |
136 | |
137 void reset_sampled_info() { | |
138 _last_sampled_rs_lengths = 0; | |
139 } | |
140 size_t sampled_rs_lengths() { return _last_sampled_rs_lengths; } | |
141 | |
142 // for development purposes | |
143 void reset_auxilary_lists(); | |
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144 void clear() { _head = NULL; _length = 0; } |
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145 |
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146 void clear_survivors() { |
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147 _survivor_head = NULL; |
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148 _survivor_tail = NULL; |
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149 _survivor_length = 0; |
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150 } |
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151 |
342 | 152 HeapRegion* first_region() { return _head; } |
153 HeapRegion* first_survivor_region() { return _survivor_head; } | |
545 | 154 HeapRegion* last_survivor_region() { return _survivor_tail; } |
342 | 155 |
156 // debugging | |
157 bool check_list_well_formed(); | |
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158 bool check_list_empty(bool check_sample = true); |
342 | 159 void print(); |
160 }; | |
161 | |
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162 class MutatorAllocRegion : public G1AllocRegion { |
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163 protected: |
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164 virtual HeapRegion* allocate_new_region(size_t word_size, bool force); |
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165 virtual void retire_region(HeapRegion* alloc_region, size_t allocated_bytes); |
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166 public: |
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167 MutatorAllocRegion() |
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168 : G1AllocRegion("Mutator Alloc Region", false /* bot_updates */) { } |
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169 }; |
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170 |
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171 class SurvivorGCAllocRegion : public G1AllocRegion { |
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172 protected: |
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173 virtual HeapRegion* allocate_new_region(size_t word_size, bool force); |
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174 virtual void retire_region(HeapRegion* alloc_region, size_t allocated_bytes); |
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175 public: |
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176 SurvivorGCAllocRegion() |
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177 : G1AllocRegion("Survivor GC Alloc Region", false /* bot_updates */) { } |
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178 }; |
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179 |
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180 class OldGCAllocRegion : public G1AllocRegion { |
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181 protected: |
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182 virtual HeapRegion* allocate_new_region(size_t word_size, bool force); |
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183 virtual void retire_region(HeapRegion* alloc_region, size_t allocated_bytes); |
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184 public: |
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185 OldGCAllocRegion() |
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186 : G1AllocRegion("Old GC Alloc Region", true /* bot_updates */) { } |
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187 }; |
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188 |
12080 | 189 // The G1 STW is alive closure. |
190 // An instance is embedded into the G1CH and used as the | |
191 // (optional) _is_alive_non_header closure in the STW | |
192 // reference processor. It is also extensively used during | |
193 // reference processing during STW evacuation pauses. | |
194 class G1STWIsAliveClosure: public BoolObjectClosure { | |
195 G1CollectedHeap* _g1; | |
196 public: | |
197 G1STWIsAliveClosure(G1CollectedHeap* g1) : _g1(g1) {} | |
198 bool do_object_b(oop p); | |
199 }; | |
200 | |
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201 // Instances of this class are used for quick tests on whether a reference points |
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202 // into the collection set. Each of the array's elements denotes whether the |
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203 // corresponding region is in the collection set. |
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204 class G1FastCSetBiasedMappedArray : public G1BiasedMappedArray<bool> { |
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205 protected: |
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206 bool default_value() const { return false; } |
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207 public: |
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208 void clear() { G1BiasedMappedArray<bool>::clear(); } |
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209 }; |
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210 |
342 | 211 class RefineCardTableEntryClosure; |
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212 |
342 | 213 class G1CollectedHeap : public SharedHeap { |
214 friend class VM_G1CollectForAllocation; | |
215 friend class VM_G1CollectFull; | |
216 friend class VM_G1IncCollectionPause; | |
217 friend class VMStructs; | |
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218 friend class MutatorAllocRegion; |
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219 friend class SurvivorGCAllocRegion; |
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220 friend class OldGCAllocRegion; |
342 | 221 |
222 // Closures used in implementation. | |
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223 template <G1Barrier barrier, bool do_mark_object> |
5987 | 224 friend class G1ParCopyClosure; |
342 | 225 friend class G1IsAliveClosure; |
226 friend class G1EvacuateFollowersClosure; | |
227 friend class G1ParScanThreadState; | |
228 friend class G1ParScanClosureSuper; | |
229 friend class G1ParEvacuateFollowersClosure; | |
230 friend class G1ParTask; | |
231 friend class G1FreeGarbageRegionClosure; | |
232 friend class RefineCardTableEntryClosure; | |
233 friend class G1PrepareCompactClosure; | |
234 friend class RegionSorter; | |
2152 | 235 friend class RegionResetter; |
342 | 236 friend class CountRCClosure; |
237 friend class EvacPopObjClosure; | |
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238 friend class G1ParCleanupCTTask; |
342 | 239 |
240 // Other related classes. | |
241 friend class G1MarkSweep; | |
242 | |
243 private: | |
244 // The one and only G1CollectedHeap, so static functions can find it. | |
245 static G1CollectedHeap* _g1h; | |
246 | |
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247 static size_t _humongous_object_threshold_in_words; |
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248 |
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249 // Storage for the G1 heap. |
342 | 250 VirtualSpace _g1_storage; |
251 MemRegion _g1_reserved; | |
252 | |
253 // The part of _g1_storage that is currently committed. | |
254 MemRegion _g1_committed; | |
255 | |
2152 | 256 // The master free list. It will satisfy all new region allocations. |
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257 FreeRegionList _free_list; |
2152 | 258 |
259 // The secondary free list which contains regions that have been | |
260 // freed up during the cleanup process. This will be appended to the | |
261 // master free list when appropriate. | |
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262 FreeRegionList _secondary_free_list; |
2152 | 263 |
4072 | 264 // It keeps track of the old regions. |
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265 HeapRegionSet _old_set; |
4072 | 266 |
2152 | 267 // It keeps track of the humongous regions. |
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268 HeapRegionSet _humongous_set; |
342 | 269 |
270 // The number of regions we could create by expansion. | |
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271 uint _expansion_regions; |
342 | 272 |
273 // The block offset table for the G1 heap. | |
274 G1BlockOffsetSharedArray* _bot_shared; | |
275 | |
4072 | 276 // Tears down the region sets / lists so that they are empty and the |
277 // regions on the heap do not belong to a region set / list. The | |
278 // only exception is the humongous set which we leave unaltered. If | |
279 // free_list_only is true, it will only tear down the master free | |
280 // list. It is called before a Full GC (free_list_only == false) or | |
281 // before heap shrinking (free_list_only == true). | |
282 void tear_down_region_sets(bool free_list_only); | |
283 | |
284 // Rebuilds the region sets / lists so that they are repopulated to | |
285 // reflect the contents of the heap. The only exception is the | |
286 // humongous set which was not torn down in the first place. If | |
287 // free_list_only is true, it will only rebuild the master free | |
288 // list. It is called after a Full GC (free_list_only == false) or | |
289 // after heap shrinking (free_list_only == true). | |
290 void rebuild_region_sets(bool free_list_only); | |
342 | 291 |
292 // The sequence of all heap regions in the heap. | |
3766 | 293 HeapRegionSeq _hrs; |
342 | 294 |
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295 // Alloc region used to satisfy mutator allocation requests. |
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296 MutatorAllocRegion _mutator_alloc_region; |
342 | 297 |
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298 // Alloc region used to satisfy allocation requests by the GC for |
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299 // survivor objects. |
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300 SurvivorGCAllocRegion _survivor_gc_alloc_region; |
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301 |
6595 | 302 // PLAB sizing policy for survivors. |
303 PLABStats _survivor_plab_stats; | |
304 | |
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305 // Alloc region used to satisfy allocation requests by the GC for |
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306 // old objects. |
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307 OldGCAllocRegion _old_gc_alloc_region; |
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308 |
6595 | 309 // PLAB sizing policy for tenured objects. |
310 PLABStats _old_plab_stats; | |
311 | |
312 PLABStats* stats_for_purpose(GCAllocPurpose purpose) { | |
313 PLABStats* stats = NULL; | |
314 | |
315 switch (purpose) { | |
316 case GCAllocForSurvived: | |
317 stats = &_survivor_plab_stats; | |
318 break; | |
319 case GCAllocForTenured: | |
320 stats = &_old_plab_stats; | |
321 break; | |
322 default: | |
323 assert(false, "unrecognized GCAllocPurpose"); | |
324 } | |
325 | |
326 return stats; | |
327 } | |
328 | |
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329 // The last old region we allocated to during the last GC. |
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330 // Typically, it is not full so we should re-use it during the next GC. |
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331 HeapRegion* _retained_old_gc_alloc_region; |
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332 |
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333 // It specifies whether we should attempt to expand the heap after a |
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334 // region allocation failure. If heap expansion fails we set this to |
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335 // false so that we don't re-attempt the heap expansion (it's likely |
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336 // that subsequent expansion attempts will also fail if one fails). |
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337 // Currently, it is only consulted during GC and it's reset at the |
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338 // start of each GC. |
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339 bool _expand_heap_after_alloc_failure; |
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340 |
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341 // It resets the mutator alloc region before new allocations can take place. |
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342 void init_mutator_alloc_region(); |
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343 |
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344 // It releases the mutator alloc region. |
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345 void release_mutator_alloc_region(); |
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346 |
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347 // It initializes the GC alloc regions at the start of a GC. |
10405 | 348 void init_gc_alloc_regions(EvacuationInfo& evacuation_info); |
342 | 349 |
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350 // It releases the GC alloc regions at the end of a GC. |
10405 | 351 void release_gc_alloc_regions(uint no_of_gc_workers, EvacuationInfo& evacuation_info); |
342 | 352 |
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353 // It does any cleanup that needs to be done on the GC alloc regions |
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354 // before a Full GC. |
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355 void abandon_gc_alloc_regions(); |
342 | 356 |
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357 // Helper for monitoring and management support. |
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358 G1MonitoringSupport* _g1mm; |
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359 |
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360 // Determines PLAB size for a particular allocation purpose. |
6595 | 361 size_t desired_plab_sz(GCAllocPurpose purpose); |
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362 |
342 | 363 // Outside of GC pauses, the number of bytes used in all regions other |
364 // than the current allocation region. | |
365 size_t _summary_bytes_used; | |
366 | |
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367 // This array is used for a quick test on whether a reference points into |
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368 // the collection set or not. Each of the array's elements denotes whether the |
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369 // corresponding region is in the collection set or not. |
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370 G1FastCSetBiasedMappedArray _in_cset_fast_test; |
526 | 371 |
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372 volatile unsigned _gc_time_stamp; |
342 | 373 |
374 size_t* _surviving_young_words; | |
375 | |
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376 G1HRPrinter _hr_printer; |
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377 |
342 | 378 void setup_surviving_young_words(); |
379 void update_surviving_young_words(size_t* surv_young_words); | |
380 void cleanup_surviving_young_words(); | |
381 | |
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382 // It decides whether an explicit GC should start a concurrent cycle |
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383 // instead of doing a STW GC. Currently, a concurrent cycle is |
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384 // explicitly started if: |
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385 // (a) cause == _gc_locker and +GCLockerInvokesConcurrent, or |
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386 // (b) cause == _java_lang_system_gc and +ExplicitGCInvokesConcurrent. |
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387 // (c) cause == _g1_humongous_allocation |
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388 bool should_do_concurrent_full_gc(GCCause::Cause cause); |
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389 |
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390 // Keeps track of how many "old marking cycles" (i.e., Full GCs or |
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391 // concurrent cycles) we have started. |
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392 volatile unsigned int _old_marking_cycles_started; |
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393 |
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394 // Keeps track of how many "old marking cycles" (i.e., Full GCs or |
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395 // concurrent cycles) we have completed. |
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396 volatile unsigned int _old_marking_cycles_completed; |
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397 |
10405 | 398 bool _concurrent_cycle_started; |
399 | |
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400 // This is a non-product method that is helpful for testing. It is |
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401 // called at the end of a GC and artificially expands the heap by |
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402 // allocating a number of dead regions. This way we can induce very |
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403 // frequent marking cycles and stress the cleanup / concurrent |
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404 // cleanup code more (as all the regions that will be allocated by |
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405 // this method will be found dead by the marking cycle). |
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406 void allocate_dummy_regions() PRODUCT_RETURN; |
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407 |
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408 // Clear RSets after a compaction. It also resets the GC time stamps. |
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409 void clear_rsets_post_compaction(); |
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410 |
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411 // If the HR printer is active, dump the state of the regions in the |
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412 // heap after a compaction. |
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413 void print_hrs_post_compaction(); |
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414 |
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415 double verify(bool guard, const char* msg); |
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416 void verify_before_gc(); |
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417 void verify_after_gc(); |
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418 |
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419 void log_gc_header(); |
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420 void log_gc_footer(double pause_time_sec); |
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421 |
1973 | 422 // These are macros so that, if the assert fires, we get the correct |
423 // line number, file, etc. | |
424 | |
2361 | 425 #define heap_locking_asserts_err_msg(_extra_message_) \ |
2152 | 426 err_msg("%s : Heap_lock locked: %s, at safepoint: %s, is VM thread: %s", \ |
2361 | 427 (_extra_message_), \ |
2152 | 428 BOOL_TO_STR(Heap_lock->owned_by_self()), \ |
429 BOOL_TO_STR(SafepointSynchronize::is_at_safepoint()), \ | |
430 BOOL_TO_STR(Thread::current()->is_VM_thread())) | |
1973 | 431 |
432 #define assert_heap_locked() \ | |
433 do { \ | |
434 assert(Heap_lock->owned_by_self(), \ | |
435 heap_locking_asserts_err_msg("should be holding the Heap_lock")); \ | |
436 } while (0) | |
437 | |
2361 | 438 #define assert_heap_locked_or_at_safepoint(_should_be_vm_thread_) \ |
1973 | 439 do { \ |
440 assert(Heap_lock->owned_by_self() || \ | |
2152 | 441 (SafepointSynchronize::is_at_safepoint() && \ |
2361 | 442 ((_should_be_vm_thread_) == Thread::current()->is_VM_thread())), \ |
1973 | 443 heap_locking_asserts_err_msg("should be holding the Heap_lock or " \ |
444 "should be at a safepoint")); \ | |
445 } while (0) | |
446 | |
447 #define assert_heap_locked_and_not_at_safepoint() \ | |
448 do { \ | |
449 assert(Heap_lock->owned_by_self() && \ | |
450 !SafepointSynchronize::is_at_safepoint(), \ | |
451 heap_locking_asserts_err_msg("should be holding the Heap_lock and " \ | |
452 "should not be at a safepoint")); \ | |
453 } while (0) | |
454 | |
455 #define assert_heap_not_locked() \ | |
456 do { \ | |
457 assert(!Heap_lock->owned_by_self(), \ | |
458 heap_locking_asserts_err_msg("should not be holding the Heap_lock")); \ | |
459 } while (0) | |
460 | |
461 #define assert_heap_not_locked_and_not_at_safepoint() \ | |
462 do { \ | |
463 assert(!Heap_lock->owned_by_self() && \ | |
464 !SafepointSynchronize::is_at_safepoint(), \ | |
465 heap_locking_asserts_err_msg("should not be holding the Heap_lock and " \ | |
466 "should not be at a safepoint")); \ | |
467 } while (0) | |
468 | |
2361 | 469 #define assert_at_safepoint(_should_be_vm_thread_) \ |
1973 | 470 do { \ |
2152 | 471 assert(SafepointSynchronize::is_at_safepoint() && \ |
2361 | 472 ((_should_be_vm_thread_) == Thread::current()->is_VM_thread()), \ |
1973 | 473 heap_locking_asserts_err_msg("should be at a safepoint")); \ |
474 } while (0) | |
475 | |
476 #define assert_not_at_safepoint() \ | |
477 do { \ | |
478 assert(!SafepointSynchronize::is_at_safepoint(), \ | |
479 heap_locking_asserts_err_msg("should not be at a safepoint")); \ | |
480 } while (0) | |
481 | |
342 | 482 protected: |
483 | |
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484 // The young region list. |
342 | 485 YoungList* _young_list; |
486 | |
487 // The current policy object for the collector. | |
488 G1CollectorPolicy* _g1_policy; | |
489 | |
2152 | 490 // This is the second level of trying to allocate a new region. If |
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491 // new_region() didn't find a region on the free_list, this call will |
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492 // check whether there's anything available on the |
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493 // secondary_free_list and/or wait for more regions to appear on |
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494 // that list, if _free_regions_coming is set. |
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495 HeapRegion* new_region_try_secondary_free_list(bool is_old); |
342 | 496 |
2361 | 497 // Try to allocate a single non-humongous HeapRegion sufficient for |
498 // an allocation of the given word_size. If do_expand is true, | |
499 // attempt to expand the heap if necessary to satisfy the allocation | |
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500 // request. If the region is to be used as an old region or for a |
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501 // humongous object, set is_old to true. If not, to false. |
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502 HeapRegion* new_region(size_t word_size, bool is_old, bool do_expand); |
342 | 503 |
2361 | 504 // Attempt to satisfy a humongous allocation request of the given |
505 // size by finding a contiguous set of free regions of num_regions | |
506 // length and remove them from the master free list. Return the | |
3766 | 507 // index of the first region or G1_NULL_HRS_INDEX if the search |
508 // was unsuccessful. | |
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509 uint humongous_obj_allocate_find_first(uint num_regions, |
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510 size_t word_size); |
342 | 511 |
2361 | 512 // Initialize a contiguous set of free regions of length num_regions |
513 // and starting at index first so that they appear as a single | |
514 // humongous region. | |
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515 HeapWord* humongous_obj_allocate_initialize_regions(uint first, |
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516 uint num_regions, |
2361 | 517 size_t word_size); |
518 | |
519 // Attempt to allocate a humongous object of the given size. Return | |
520 // NULL if unsuccessful. | |
2152 | 521 HeapWord* humongous_obj_allocate(size_t word_size); |
1973 | 522 |
523 // The following two methods, allocate_new_tlab() and | |
524 // mem_allocate(), are the two main entry points from the runtime | |
525 // into the G1's allocation routines. They have the following | |
526 // assumptions: | |
527 // | |
528 // * They should both be called outside safepoints. | |
529 // | |
530 // * They should both be called without holding the Heap_lock. | |
531 // | |
532 // * All allocation requests for new TLABs should go to | |
533 // allocate_new_tlab(). | |
534 // | |
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535 // * All non-TLAB allocation requests should go to mem_allocate(). |
1973 | 536 // |
537 // * If either call cannot satisfy the allocation request using the | |
538 // current allocating region, they will try to get a new one. If | |
539 // this fails, they will attempt to do an evacuation pause and | |
540 // retry the allocation. | |
541 // | |
542 // * If all allocation attempts fail, even after trying to schedule | |
543 // an evacuation pause, allocate_new_tlab() will return NULL, | |
544 // whereas mem_allocate() will attempt a heap expansion and/or | |
545 // schedule a Full GC. | |
546 // | |
547 // * We do not allow humongous-sized TLABs. So, allocate_new_tlab | |
548 // should never be called with word_size being humongous. All | |
549 // humongous allocation requests should go to mem_allocate() which | |
550 // will satisfy them with a special path. | |
551 | |
552 virtual HeapWord* allocate_new_tlab(size_t word_size); | |
553 | |
554 virtual HeapWord* mem_allocate(size_t word_size, | |
555 bool* gc_overhead_limit_was_exceeded); | |
342 | 556 |
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557 // The following three methods take a gc_count_before_ret |
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558 // parameter which is used to return the GC count if the method |
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559 // returns NULL. Given that we are required to read the GC count |
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560 // while holding the Heap_lock, and these paths will take the |
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561 // Heap_lock at some point, it's easier to get them to read the GC |
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562 // count while holding the Heap_lock before they return NULL instead |
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563 // of the caller (namely: mem_allocate()) having to also take the |
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564 // Heap_lock just to read the GC count. |
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565 |
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566 // First-level mutator allocation attempt: try to allocate out of |
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567 // the mutator alloc region without taking the Heap_lock. This |
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568 // should only be used for non-humongous allocations. |
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569 inline HeapWord* attempt_allocation(size_t word_size, |
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570 unsigned int* gc_count_before_ret, |
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571 int* gclocker_retry_count_ret); |
342 | 572 |
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573 // Second-level mutator allocation attempt: take the Heap_lock and |
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574 // retry the allocation attempt, potentially scheduling a GC |
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575 // pause. This should only be used for non-humongous allocations. |
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576 HeapWord* attempt_allocation_slow(size_t word_size, |
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577 unsigned int* gc_count_before_ret, |
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578 int* gclocker_retry_count_ret); |
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579 |
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580 // Takes the Heap_lock and attempts a humongous allocation. It can |
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581 // potentially schedule a GC pause. |
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582 HeapWord* attempt_allocation_humongous(size_t word_size, |
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583 unsigned int* gc_count_before_ret, |
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584 int* gclocker_retry_count_ret); |
1973 | 585 |
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586 // Allocation attempt that should be called during safepoints (e.g., |
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587 // at the end of a successful GC). expect_null_mutator_alloc_region |
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588 // specifies whether the mutator alloc region is expected to be NULL |
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589 // or not. |
1973 | 590 HeapWord* attempt_allocation_at_safepoint(size_t word_size, |
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591 bool expect_null_mutator_alloc_region); |
1973 | 592 |
593 // It dirties the cards that cover the block so that so that the post | |
594 // write barrier never queues anything when updating objects on this | |
595 // block. It is assumed (and in fact we assert) that the block | |
596 // belongs to a young region. | |
597 inline void dirty_young_block(HeapWord* start, size_t word_size); | |
342 | 598 |
599 // Allocate blocks during garbage collection. Will ensure an | |
600 // allocation region, either by picking one or expanding the | |
601 // heap, and then allocate a block of the given size. The block | |
602 // may not be a humongous - it must fit into a single heap region. | |
603 HeapWord* par_allocate_during_gc(GCAllocPurpose purpose, size_t word_size); | |
604 | |
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605 HeapWord* allocate_during_gc_slow(GCAllocPurpose purpose, |
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606 HeapRegion* alloc_region, |
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607 bool par, |
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608 size_t word_size); |
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609 |
342 | 610 // Ensure that no further allocations can happen in "r", bearing in mind |
611 // that parallel threads might be attempting allocations. | |
612 void par_allocate_remaining_space(HeapRegion* r); | |
613 | |
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614 // Allocation attempt during GC for a survivor object / PLAB. |
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615 inline HeapWord* survivor_attempt_allocation(size_t word_size); |
545 | 616 |
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617 // Allocation attempt during GC for an old object / PLAB. |
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618 inline HeapWord* old_attempt_allocation(size_t word_size); |
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619 |
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620 // These methods are the "callbacks" from the G1AllocRegion class. |
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621 |
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622 // For mutator alloc regions. |
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623 HeapRegion* new_mutator_alloc_region(size_t word_size, bool force); |
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624 void retire_mutator_alloc_region(HeapRegion* alloc_region, |
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625 size_t allocated_bytes); |
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626 |
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627 // For GC alloc regions. |
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628 HeapRegion* new_gc_alloc_region(size_t word_size, uint count, |
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629 GCAllocPurpose ap); |
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630 void retire_gc_alloc_region(HeapRegion* alloc_region, |
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631 size_t allocated_bytes, GCAllocPurpose ap); |
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632 |
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633 // - if explicit_gc is true, the GC is for a System.gc() or a heap |
1973 | 634 // inspection request and should collect the entire heap |
635 // - if clear_all_soft_refs is true, all soft references should be | |
636 // cleared during the GC | |
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637 // - if explicit_gc is false, word_size describes the allocation that |
1973 | 638 // the GC should attempt (at least) to satisfy |
639 // - it returns false if it is unable to do the collection due to the | |
640 // GC locker being active, true otherwise | |
641 bool do_collection(bool explicit_gc, | |
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642 bool clear_all_soft_refs, |
342 | 643 size_t word_size); |
644 | |
645 // Callback from VM_G1CollectFull operation. | |
646 // Perform a full collection. | |
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647 virtual void do_full_collection(bool clear_all_soft_refs); |
342 | 648 |
649 // Resize the heap if necessary after a full collection. If this is | |
650 // after a collect-for allocation, "word_size" is the allocation size, | |
651 // and will be considered part of the used portion of the heap. | |
652 void resize_if_necessary_after_full_collection(size_t word_size); | |
653 | |
654 // Callback from VM_G1CollectForAllocation operation. | |
655 // This function does everything necessary/possible to satisfy a | |
656 // failed allocation request (including collection, expansion, etc.) | |
1973 | 657 HeapWord* satisfy_failed_allocation(size_t word_size, bool* succeeded); |
342 | 658 |
659 // Attempting to expand the heap sufficiently | |
660 // to support an allocation of the given "word_size". If | |
661 // successful, perform the allocation and return the address of the | |
662 // allocated block, or else "NULL". | |
1973 | 663 HeapWord* expand_and_allocate(size_t word_size); |
342 | 664 |
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665 // Process any reference objects discovered during |
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666 // an incremental evacuation pause. |
6819 | 667 void process_discovered_references(uint no_of_gc_workers); |
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668 |
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669 // Enqueue any remaining discovered references |
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670 // after processing. |
6819 | 671 void enqueue_discovered_references(uint no_of_gc_workers); |
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672 |
342 | 673 public: |
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674 |
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675 G1MonitoringSupport* g1mm() { |
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676 assert(_g1mm != NULL, "should have been initialized"); |
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677 return _g1mm; |
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|
678 } |
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679 |
342 | 680 // Expand the garbage-first heap by at least the given size (in bytes!). |
2188
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681 // Returns true if the heap was expanded by the requested amount; |
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682 // false otherwise. |
342 | 683 // (Rounds up to a HeapRegion boundary.) |
2188
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684 bool expand(size_t expand_bytes); |
342 | 685 |
686 // Do anything common to GC's. | |
687 virtual void gc_prologue(bool full); | |
688 virtual void gc_epilogue(bool full); | |
689 | |
526 | 690 // We register a region with the fast "in collection set" test. We |
691 // simply set to true the array slot corresponding to this region. | |
692 void register_region_with_in_cset_fast_test(HeapRegion* r) { | |
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693 _in_cset_fast_test.set_by_index(r->hrs_index(), true); |
526 | 694 } |
695 | |
696 // This is a fast test on whether a reference points into the | |
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697 // collection set or not. Assume that the reference |
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698 // points into the heap. |
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699 inline bool in_cset_fast_test(oop obj); |
526 | 700 |
1394
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701 void clear_cset_fast_test() { |
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702 _in_cset_fast_test.clear(); |
1394
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703 } |
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704 |
6120
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7172388: G1: _total_full_collections should not be incremented for concurrent cycles
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705 // This is called at the start of either a concurrent cycle or a Full |
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706 // GC to update the number of old marking cycles started. |
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707 void increment_old_marking_cycles_started(); |
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708 |
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709 // This is called at the end of either a concurrent cycle or a Full |
6120
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|
710 // GC to update the number of old marking cycles completed. Those two |
1656
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711 // can happen in a nested fashion, i.e., we start a concurrent |
4e5661ba9d98
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|
712 // cycle, a Full GC happens half-way through it which ends first, |
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tonyp
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|
713 // 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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|
714 // 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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diff
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|
715 // tighter consistency checking in the method. If concurrent is |
fb712ff22571
7000559: G1: assertion failure !outer || (full_collections_started == _full_collections_completed + 1)
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1991
diff
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|
716 // 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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diff
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|
717 // Full GC). If concurrent is true, the caller is the outer caller |
fb712ff22571
7000559: G1: assertion failure !outer || (full_collections_started == _full_collections_completed + 1)
tonyp
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diff
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|
718 // in this nesting (i.e., the concurrent cycle). Further nesting is |
6120
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brutisso
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|
719 // not currently supported. The end of this call also notifies |
2030
fb712ff22571
7000559: G1: assertion failure !outer || (full_collections_started == _full_collections_completed + 1)
tonyp
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diff
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|
720 // 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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diff
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|
721 // GC to happen (e.g., it called System.gc() with |
1656
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tonyp
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|
722 // +ExplicitGCInvokesConcurrent). |
6120
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|
723 void increment_old_marking_cycles_completed(bool concurrent); |
1656
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|
724 |
6120
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|
725 unsigned int old_marking_cycles_completed() { |
37552638d24a
7172388: G1: _total_full_collections should not be incremented for concurrent cycles
brutisso
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|
726 return _old_marking_cycles_completed; |
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tonyp
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|
727 } |
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diff
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|
728 |
13400
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8028128: Add a type safe alternative for working with counter based data
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|
729 void register_concurrent_cycle_start(const Ticks& start_time); |
10405 | 730 void register_concurrent_cycle_end(); |
731 void trace_heap_after_concurrent_cycle(); | |
732 | |
733 G1YCType yc_type(); | |
734 | |
3778
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7049999: G1: Make the G1PrintHeapRegions output consistent and complete
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|
735 G1HRPrinter* hr_printer() { return &_hr_printer; } |
5f6f2615433a
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|
736 |
17736
58fc1b1523dc
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|
737 // Frees a non-humongous region by initializing its contents and |
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|
738 // adding it to the free list that's passed as a parameter (this is |
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739 // usually a local list which will be appended to the master free |
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740 // list later). The used bytes of freed regions are accumulated in |
58fc1b1523dc
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|
741 // pre_used. If par is true, the region's RSet will not be freed |
58fc1b1523dc
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|
742 // up. The assumption is that this will be done later. |
17755
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|
743 // The locked parameter indicates if the caller has already taken |
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8027295: Free CSet takes ~50% of young pause time
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|
744 // care of proper synchronization. This may allow some optimizations. |
17736
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|
745 void free_region(HeapRegion* hr, |
58fc1b1523dc
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|
746 FreeRegionList* free_list, |
17755
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tschatzl
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|
747 bool par, |
96b1c2e06e25
8027295: Free CSet takes ~50% of young pause time
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|
748 bool locked = false); |
17736
58fc1b1523dc
8034079: G1: Refactor the HeapRegionSet hierarchy
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|
749 |
58fc1b1523dc
8034079: G1: Refactor the HeapRegionSet hierarchy
brutisso
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|
750 // Frees a humongous region by collapsing it into individual regions |
58fc1b1523dc
8034079: G1: Refactor the HeapRegionSet hierarchy
brutisso
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|
751 // and calling free_region() for each of them. The freed regions |
58fc1b1523dc
8034079: G1: Refactor the HeapRegionSet hierarchy
brutisso
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17727
diff
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|
752 // will be added to the free list that's passed as a parameter (this |
58fc1b1523dc
8034079: G1: Refactor the HeapRegionSet hierarchy
brutisso
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17727
diff
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|
753 // is usually a local list which will be appended to the master free |
58fc1b1523dc
8034079: G1: Refactor the HeapRegionSet hierarchy
brutisso
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|
754 // list later). The used bytes of freed regions are accumulated in |
58fc1b1523dc
8034079: G1: Refactor the HeapRegionSet hierarchy
brutisso
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|
755 // 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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|
756 // up. The assumption is that this will be done later. |
58fc1b1523dc
8034079: G1: Refactor the HeapRegionSet hierarchy
brutisso
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|
757 void free_humongous_region(HeapRegion* hr, |
58fc1b1523dc
8034079: G1: Refactor the HeapRegionSet hierarchy
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|
758 FreeRegionList* free_list, |
58fc1b1523dc
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17727
diff
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|
759 bool par); |
342 | 760 protected: |
761 | |
762 // Shrink the garbage-first heap by at most the given size (in bytes!). | |
763 // (Rounds down to a HeapRegion boundary.) | |
764 virtual void shrink(size_t expand_bytes); | |
765 void shrink_helper(size_t expand_bytes); | |
766 | |
1709 | 767 #if TASKQUEUE_STATS |
768 static void print_taskqueue_stats_hdr(outputStream* const st = gclog_or_tty); | |
769 void print_taskqueue_stats(outputStream* const st = gclog_or_tty) const; | |
770 void reset_taskqueue_stats(); | |
771 #endif // TASKQUEUE_STATS | |
772 | |
1973 | 773 // Schedule the VM operation that will do an evacuation pause to |
774 // satisfy an allocation request of word_size. *succeeded will | |
775 // return whether the VM operation was successful (it did do an | |
776 // evacuation pause) or not (another thread beat us to it or the GC | |
777 // locker was active). Given that we should not be holding the | |
778 // Heap_lock when we enter this method, we will pass the | |
779 // gc_count_before (i.e., total_collections()) as a parameter since | |
780 // it has to be read while holding the Heap_lock. Currently, both | |
781 // methods that call do_collection_pause() release the Heap_lock | |
782 // before the call, so it's easy to read gc_count_before just before. | |
12113
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brutisso
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|
783 HeapWord* do_collection_pause(size_t word_size, |
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8022872: G1: Use correct GC cause for young GC triggered by humongous allocations
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|
784 unsigned int gc_count_before, |
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|
785 bool* succeeded, |
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|
786 GCCause::Cause gc_cause); |
342 | 787 |
788 // The guts of the incremental collection pause, executed by the vm | |
1973 | 789 // thread. It returns false if it is unable to do the collection due |
790 // to the GC locker being active, true otherwise | |
791 bool do_collection_pause_at_safepoint(double target_pause_time_ms); | |
342 | 792 |
793 // Actually do the work of evacuating the collection set. | |
10405 | 794 void evacuate_collection_set(EvacuationInfo& evacuation_info); |
342 | 795 |
796 // The g1 remembered set of the heap. | |
797 G1RemSet* _g1_rem_set; | |
798 | |
616
4f360ec815ba
6720309: G1: don't synchronously update RSet during evacuation pauses
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parents:
545
diff
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|
799 // A set of cards that cover the objects for which the Rsets should be updated |
4f360ec815ba
6720309: G1: don't synchronously update RSet during evacuation pauses
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545
diff
changeset
|
800 // concurrently after the collection. |
4f360ec815ba
6720309: G1: don't synchronously update RSet during evacuation pauses
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parents:
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diff
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|
801 DirtyCardQueueSet _dirty_card_queue_set; |
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6720309: G1: don't synchronously update RSet during evacuation pauses
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|
802 |
342 | 803 // The closure used to refine a single card. |
804 RefineCardTableEntryClosure* _refine_cte_cl; | |
805 | |
806 // A function to check the consistency of dirty card logs. | |
807 void check_ct_logs_at_safepoint(); | |
808 | |
1705 | 809 // A DirtyCardQueueSet that is used to hold cards that contain |
810 // references into the current collection set. This is used to | |
811 // update the remembered sets of the regions in the collection | |
812 // set in the event of an evacuation failure. | |
813 DirtyCardQueueSet _into_cset_dirty_card_queue_set; | |
814 | |
342 | 815 // After a collection pause, make the regions in the CS into free |
816 // regions. | |
10405 | 817 void free_collection_set(HeapRegion* cs_head, EvacuationInfo& evacuation_info); |
342 | 818 |
1394
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diff
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|
819 // Abandon the current collection set without recording policy |
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6819061: G1: eliminate serial Other times that are proportional to the collection set length
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diff
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|
820 // statistics or updating free lists. |
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diff
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|
821 void abandon_collection_set(HeapRegion* cs_head); |
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|
822 |
342 | 823 // Applies "scan_non_heap_roots" to roots outside the heap, |
824 // "scan_rs" to roots inside the heap (having done "set_region" to | |
6725
da91efe96a93
6964458: Reimplement class meta-data storage to use native memory
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|
825 // indicate the region in which the root resides), |
da91efe96a93
6964458: Reimplement class meta-data storage to use native memory
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|
826 // and does "scan_metadata" If "scan_rs" is |
342 | 827 // NULL, then this step is skipped. The "worker_i" |
828 // param is for use with parallel roots processing, and should be | |
829 // the "i" of the calling parallel worker thread's work(i) function. | |
830 // In the sequential case this param will be ignored. | |
6725
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|
831 void g1_process_strong_roots(bool is_scavenging, |
4910
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7129892: G1: explicit marking cycle initiation might fail to initiate a marking cycle
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|
832 ScanningOption so, |
342 | 833 OopClosure* scan_non_heap_roots, |
834 OopsInHeapRegionClosure* scan_rs, | |
6725
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835 G1KlassScanClosure* scan_klasses, |
17844
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8016302: Change type of the number of GC workers to unsigned int (2)
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17833
diff
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|
836 uint worker_i); |
342 | 837 |
838 // Apply "blk" to all the weak roots of the system. These include | |
839 // JNI weak roots, the code cache, system dictionary, symbol table, | |
840 // string table, and referents of reachable weak refs. | |
10179
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|
841 void g1_process_weak_roots(OopClosure* root_closure); |
342 | 842 |
3766 | 843 // Notifies all the necessary spaces that the committed space has |
844 // been updated (either expanded or shrunk). It should be called | |
845 // after _g1_storage is updated. | |
846 void update_committed_space(HeapWord* old_end, HeapWord* new_end); | |
847 | |
342 | 848 // The concurrent marker (and the thread it runs in.) |
849 ConcurrentMark* _cm; | |
850 ConcurrentMarkThread* _cmThread; | |
851 bool _mark_in_progress; | |
852 | |
853 // The concurrent refiner. | |
854 ConcurrentG1Refine* _cg1r; | |
855 | |
856 // The parallel task queues | |
857 RefToScanQueueSet *_task_queues; | |
858 | |
859 // True iff a evacuation has failed in the current collection. | |
860 bool _evacuation_failed; | |
861 | |
10405 | 862 EvacuationFailedInfo* _evacuation_failed_info_array; |
342 | 863 |
864 // Failed evacuations cause some logical from-space objects to have | |
865 // forwarding pointers to themselves. Reset them. | |
866 void remove_self_forwarding_pointers(); | |
867 | |
8038
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868 // Together, these store an object with a preserved mark, and its mark value. |
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869 Stack<oop, mtGC> _objs_with_preserved_marks; |
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870 Stack<markOop, mtGC> _preserved_marks_of_objs; |
342 | 871 |
872 // Preserve the mark of "obj", if necessary, in preparation for its mark | |
873 // word being overwritten with a self-forwarding-pointer. | |
874 void preserve_mark_if_necessary(oop obj, markOop m); | |
875 | |
876 // The stack of evac-failure objects left to be scanned. | |
877 GrowableArray<oop>* _evac_failure_scan_stack; | |
878 // The closure to apply to evac-failure objects. | |
879 | |
880 OopsInHeapRegionClosure* _evac_failure_closure; | |
881 // Set the field above. | |
882 void | |
883 set_evac_failure_closure(OopsInHeapRegionClosure* evac_failure_closure) { | |
884 _evac_failure_closure = evac_failure_closure; | |
885 } | |
886 | |
887 // Push "obj" on the scan stack. | |
888 void push_on_evac_failure_scan_stack(oop obj); | |
889 // Process scan stack entries until the stack is empty. | |
890 void drain_evac_failure_scan_stack(); | |
891 // True iff an invocation of "drain_scan_stack" is in progress; to | |
892 // prevent unnecessary recursion. | |
893 bool _drain_in_progress; | |
894 | |
895 // Do any necessary initialization for evacuation-failure handling. | |
896 // "cl" is the closure that will be used to process evac-failure | |
897 // objects. | |
898 void init_for_evac_failure(OopsInHeapRegionClosure* cl); | |
899 // Do any necessary cleanup for evacuation-failure handling data | |
900 // structures. | |
901 void finalize_for_evac_failure(); | |
902 | |
903 // An attempt to evacuate "obj" has failed; take necessary steps. | |
10405 | 904 oop handle_evacuation_failure_par(G1ParScanThreadState* _par_scan_state, oop obj); |
342 | 905 void handle_evacuation_failure_common(oop obj, markOop m); |
906 | |
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907 #ifndef PRODUCT |
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908 // Support for forcing evacuation failures. Analogous to |
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909 // PromotionFailureALot for the other collectors. |
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910 |
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911 // Records whether G1EvacuationFailureALot should be in effect |
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912 // for the current GC |
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913 bool _evacuation_failure_alot_for_current_gc; |
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914 |
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915 // Used to record the GC number for interval checking when |
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916 // determining whether G1EvaucationFailureALot is in effect |
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917 // for the current GC. |
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918 size_t _evacuation_failure_alot_gc_number; |
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919 |
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920 // Count of the number of evacuations between failures. |
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921 volatile size_t _evacuation_failure_alot_count; |
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922 |
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923 // Set whether G1EvacuationFailureALot should be in effect |
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924 // for the current GC (based upon the type of GC and which |
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925 // command line flags are set); |
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926 inline bool evacuation_failure_alot_for_gc_type(bool gcs_are_young, |
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927 bool during_initial_mark, |
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928 bool during_marking); |
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929 |
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930 inline void set_evacuation_failure_alot_for_current_gc(); |
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931 |
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932 // Return true if it's time to cause an evacuation failure. |
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933 inline bool evacuation_should_fail(); |
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934 |
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935 // Reset the G1EvacuationFailureALot counters. Should be called at |
10405 | 936 // the end of an evacuation pause in which an evacuation failure occurred. |
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937 inline void reset_evacuation_should_fail(); |
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938 #endif // !PRODUCT |
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939 |
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940 // ("Weak") Reference processing support. |
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941 // |
10405 | 942 // G1 has 2 instances of the reference processor class. One |
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943 // (_ref_processor_cm) handles reference object discovery |
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944 // and subsequent processing during concurrent marking cycles. |
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945 // |
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946 // The other (_ref_processor_stw) handles reference object |
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947 // discovery and processing during full GCs and incremental |
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948 // evacuation pauses. |
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949 // |
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950 // During an incremental pause, reference discovery will be |
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951 // temporarily disabled for _ref_processor_cm and will be |
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952 // enabled for _ref_processor_stw. At the end of the evacuation |
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953 // pause references discovered by _ref_processor_stw will be |
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954 // processed and discovery will be disabled. The previous |
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955 // setting for reference object discovery for _ref_processor_cm |
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956 // will be re-instated. |
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957 // |
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958 // At the start of marking: |
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959 // * Discovery by the CM ref processor is verified to be inactive |
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960 // and it's discovered lists are empty. |
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961 // * Discovery by the CM ref processor is then enabled. |
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962 // |
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963 // At the end of marking: |
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964 // * Any references on the CM ref processor's discovered |
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965 // lists are processed (possibly MT). |
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966 // |
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967 // At the start of full GC we: |
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968 // * Disable discovery by the CM ref processor and |
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969 // empty CM ref processor's discovered lists |
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970 // (without processing any entries). |
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971 // * Verify that the STW ref processor is inactive and it's |
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972 // discovered lists are empty. |
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973 // * Temporarily set STW ref processor discovery as single threaded. |
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974 // * Temporarily clear the STW ref processor's _is_alive_non_header |
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975 // field. |
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976 // * Finally enable discovery by the STW ref processor. |
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977 // |
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978 // The STW ref processor is used to record any discovered |
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979 // references during the full GC. |
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980 // |
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981 // At the end of a full GC we: |
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982 // * Enqueue any reference objects discovered by the STW ref processor |
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983 // that have non-live referents. This has the side-effect of |
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984 // making the STW ref processor inactive by disabling discovery. |
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985 // * Verify that the CM ref processor is still inactive |
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986 // and no references have been placed on it's discovered |
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987 // lists (also checked as a precondition during initial marking). |
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988 |
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989 // The (stw) reference processor... |
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990 ReferenceProcessor* _ref_processor_stw; |
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991 |
10405 | 992 STWGCTimer* _gc_timer_stw; |
993 ConcurrentGCTimer* _gc_timer_cm; | |
994 | |
995 G1OldTracer* _gc_tracer_cm; | |
996 G1NewTracer* _gc_tracer_stw; | |
997 | |
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998 // During reference object discovery, the _is_alive_non_header |
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999 // closure (if non-null) is applied to the referent object to |
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1000 // determine whether the referent is live. If so then the |
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1001 // reference object does not need to be 'discovered' and can |
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1002 // be treated as a regular oop. This has the benefit of reducing |
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1003 // the number of 'discovered' reference objects that need to |
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1004 // be processed. |
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1005 // |
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1006 // Instance of the is_alive closure for embedding into the |
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1007 // STW reference processor as the _is_alive_non_header field. |
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1008 // Supplying a value for the _is_alive_non_header field is |
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1009 // optional but doing so prevents unnecessary additions to |
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1010 // the discovered lists during reference discovery. |
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1011 G1STWIsAliveClosure _is_alive_closure_stw; |
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1012 |
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1013 // The (concurrent marking) reference processor... |
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1014 ReferenceProcessor* _ref_processor_cm; |
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1015 |
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1016 // Instance of the concurrent mark is_alive closure for embedding |
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1017 // into the Concurrent Marking reference processor as the |
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1018 // _is_alive_non_header field. Supplying a value for the |
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1019 // _is_alive_non_header field is optional but doing so prevents |
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1020 // unnecessary additions to the discovered lists during reference |
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1021 // discovery. |
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1022 G1CMIsAliveClosure _is_alive_closure_cm; |
342 | 1023 |
4709
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1024 // Cache used by G1CollectedHeap::start_cset_region_for_worker(). |
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1025 HeapRegion** _worker_cset_start_region; |
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1026 |
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1027 // Time stamp to validate the regions recorded in the cache |
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1028 // used by G1CollectedHeap::start_cset_region_for_worker(). |
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1029 // The heap region entry for a given worker is valid iff |
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1030 // the associated time stamp value matches the current value |
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1031 // of G1CollectedHeap::_gc_time_stamp. |
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1032 unsigned int* _worker_cset_start_region_time_stamp; |
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1033 |
342 | 1034 enum G1H_process_strong_roots_tasks { |
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1035 G1H_PS_filter_satb_buffers, |
342 | 1036 G1H_PS_refProcessor_oops_do, |
1037 // Leave this one last. | |
1038 G1H_PS_NumElements | |
1039 }; | |
1040 | |
1041 SubTasksDone* _process_strong_tasks; | |
1042 | |
2152 | 1043 volatile bool _free_regions_coming; |
342 | 1044 |
1045 public: | |
1833
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1046 |
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1047 SubTasksDone* process_strong_tasks() { return _process_strong_tasks; } |
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1048 |
342 | 1049 void set_refine_cte_cl_concurrency(bool concurrent); |
1050 | |
1709 | 1051 RefToScanQueue *task_queue(int i) const; |
342 | 1052 |
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1053 // A set of cards where updates happened during the GC |
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1054 DirtyCardQueueSet& dirty_card_queue_set() { return _dirty_card_queue_set; } |
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1055 |
1705 | 1056 // A DirtyCardQueueSet that is used to hold cards that contain |
1057 // references into the current collection set. This is used to | |
1058 // update the remembered sets of the regions in the collection | |
1059 // set in the event of an evacuation failure. | |
1060 DirtyCardQueueSet& into_cset_dirty_card_queue_set() | |
1061 { return _into_cset_dirty_card_queue_set; } | |
1062 | |
342 | 1063 // Create a G1CollectedHeap with the specified policy. |
1064 // Must call the initialize method afterwards. | |
1065 // May not return if something goes wrong. | |
1066 G1CollectedHeap(G1CollectorPolicy* policy); | |
1067 | |
1068 // Initialize the G1CollectedHeap to have the initial and | |
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1069 // maximum sizes and remembered and barrier sets |
342 | 1070 // specified by the policy object. |
1071 jint initialize(); | |
1072 | |
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1073 virtual void stop(); |
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1074 |
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1075 // Return the (conservative) maximum heap alignment for any G1 heap |
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1076 static size_t conservative_max_heap_alignment(); |
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1077 |
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1078 // Initialize weak reference processing. |
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1079 virtual void ref_processing_init(); |
342 | 1080 |
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1081 void set_par_threads(uint t) { |
342 | 1082 SharedHeap::set_par_threads(t); |
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1083 // Done in SharedHeap but oddly there are |
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1084 // two _process_strong_tasks's in a G1CollectedHeap |
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1085 // so do it here too. |
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1086 _process_strong_tasks->set_n_threads(t); |
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1087 } |
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1088 |
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1089 // Set _n_par_threads according to a policy TBD. |
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1090 void set_par_threads(); |
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1091 |
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1092 void set_n_termination(int t) { |
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1093 _process_strong_tasks->set_n_threads(t); |
342 | 1094 } |
1095 | |
1096 virtual CollectedHeap::Name kind() const { | |
1097 return CollectedHeap::G1CollectedHeap; | |
1098 } | |
1099 | |
1100 // The current policy object for the collector. | |
1101 G1CollectorPolicy* g1_policy() const { return _g1_policy; } | |
1102 | |
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1103 virtual CollectorPolicy* collector_policy() const { return (CollectorPolicy*) g1_policy(); } |
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1104 |
342 | 1105 // Adaptive size policy. No such thing for g1. |
1106 virtual AdaptiveSizePolicy* size_policy() { return NULL; } | |
1107 | |
1108 // The rem set and barrier set. | |
1109 G1RemSet* g1_rem_set() const { return _g1_rem_set; } | |
1110 | |
1111 unsigned get_gc_time_stamp() { | |
1112 return _gc_time_stamp; | |
1113 } | |
1114 | |
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1115 inline void reset_gc_time_stamp(); |
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1116 |
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1117 void check_gc_time_stamps() PRODUCT_RETURN; |
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1118 |
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1119 inline void increment_gc_time_stamp(); |
342 | 1120 |
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1121 // Reset the given region's GC timestamp. If it's starts humongous, |
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1122 // also reset the GC timestamp of its corresponding |
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1123 // continues humongous regions too. |
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1124 void reset_gc_time_stamps(HeapRegion* hr); |
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1125 |
1705 | 1126 void iterate_dirty_card_closure(CardTableEntryClosure* cl, |
1127 DirtyCardQueue* into_cset_dcq, | |
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1128 bool concurrent, uint worker_i); |
342 | 1129 |
1130 // The shared block offset table array. | |
1131 G1BlockOffsetSharedArray* bot_shared() const { return _bot_shared; } | |
1132 | |
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1133 // Reference Processing accessors |
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1134 |
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1135 // The STW reference processor.... |
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1136 ReferenceProcessor* ref_processor_stw() const { return _ref_processor_stw; } |
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1137 |
10405 | 1138 // The Concurrent Marking reference processor... |
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1139 ReferenceProcessor* ref_processor_cm() const { return _ref_processor_cm; } |
342 | 1140 |
10405 | 1141 ConcurrentGCTimer* gc_timer_cm() const { return _gc_timer_cm; } |
1142 G1OldTracer* gc_tracer_cm() const { return _gc_tracer_cm; } | |
1143 | |
342 | 1144 virtual size_t capacity() const; |
1145 virtual size_t used() const; | |
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1146 // This should be called when we're not holding the heap lock. The |
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1147 // result might be a bit inaccurate. |
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1148 size_t used_unlocked() const; |
342 | 1149 size_t recalculate_used() const; |
1150 | |
1151 // These virtual functions do the actual allocation. | |
1152 // Some heaps may offer a contiguous region for shared non-blocking | |
1153 // allocation, via inlined code (by exporting the address of the top and | |
1154 // end fields defining the extent of the contiguous allocation region.) | |
1155 // But G1CollectedHeap doesn't yet support this. | |
1156 | |
1157 // Return an estimate of the maximum allocation that could be performed | |
1158 // without triggering any collection or expansion activity. In a | |
1159 // generational collector, for example, this is probably the largest | |
1160 // allocation that could be supported (without expansion) in the youngest | |
1161 // generation. It is "unsafe" because no locks are taken; the result | |
1162 // should be treated as an approximation, not a guarantee, for use in | |
1163 // heuristic resizing decisions. | |
1164 virtual size_t unsafe_max_alloc(); | |
1165 | |
1166 virtual bool is_maximal_no_gc() const { | |
1167 return _g1_storage.uncommitted_size() == 0; | |
1168 } | |
1169 | |
1170 // The total number of regions in the heap. | |
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1171 uint n_regions() { return _hrs.length(); } |
3766 | 1172 |
1173 // The max number of regions in the heap. | |
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1174 uint max_regions() { return _hrs.max_length(); } |
342 | 1175 |
1176 // The number of regions that are completely free. | |
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1177 uint free_regions() { return _free_list.length(); } |
342 | 1178 |
1179 // The number of regions that are not completely free. | |
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1180 uint used_regions() { return n_regions() - free_regions(); } |
342 | 1181 |
1182 // The number of regions available for "regular" expansion. | |
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1183 uint expansion_regions() { return _expansion_regions; } |
342 | 1184 |
3766 | 1185 // Factory method for HeapRegion instances. It will return NULL if |
1186 // the allocation fails. | |
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1187 HeapRegion* new_heap_region(uint hrs_index, HeapWord* bottom); |
3766 | 1188 |
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1189 void verify_not_dirty_region(HeapRegion* hr) PRODUCT_RETURN; |
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1190 void verify_dirty_region(HeapRegion* hr) PRODUCT_RETURN; |
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1191 void verify_dirty_young_list(HeapRegion* head) PRODUCT_RETURN; |
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1192 void verify_dirty_young_regions() PRODUCT_RETURN; |
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1193 |
2152 | 1194 // verify_region_sets() performs verification over the region |
1195 // lists. It will be compiled in the product code to be used when | |
1196 // necessary (i.e., during heap verification). | |
1197 void verify_region_sets(); | |
342 | 1198 |
2152 | 1199 // verify_region_sets_optional() is planted in the code for |
1200 // list verification in non-product builds (and it can be enabled in | |
10405 | 1201 // product builds by defining HEAP_REGION_SET_FORCE_VERIFY to be 1). |
2152 | 1202 #if HEAP_REGION_SET_FORCE_VERIFY |
1203 void verify_region_sets_optional() { | |
1204 verify_region_sets(); | |
1205 } | |
1206 #else // HEAP_REGION_SET_FORCE_VERIFY | |
1207 void verify_region_sets_optional() { } | |
1208 #endif // HEAP_REGION_SET_FORCE_VERIFY | |
342 | 1209 |
2152 | 1210 #ifdef ASSERT |
2361 | 1211 bool is_on_master_free_list(HeapRegion* hr) { |
2152 | 1212 return hr->containing_set() == &_free_list; |
1213 } | |
1214 #endif // ASSERT | |
342 | 1215 |
2152 | 1216 // Wrapper for the region list operations that can be called from |
1217 // methods outside this class. | |
342 | 1218 |
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1219 void secondary_free_list_add(FreeRegionList* list) { |
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1220 _secondary_free_list.add_ordered(list); |
2152 | 1221 } |
342 | 1222 |
2152 | 1223 void append_secondary_free_list() { |
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1224 _free_list.add_ordered(&_secondary_free_list); |
2152 | 1225 } |
342 | 1226 |
2361 | 1227 void append_secondary_free_list_if_not_empty_with_lock() { |
1228 // If the secondary free list looks empty there's no reason to | |
1229 // take the lock and then try to append it. | |
2152 | 1230 if (!_secondary_free_list.is_empty()) { |
1231 MutexLockerEx x(SecondaryFreeList_lock, Mutex::_no_safepoint_check_flag); | |
1232 append_secondary_free_list(); | |
1233 } | |
1234 } | |
342 | 1235 |
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1236 inline void old_set_remove(HeapRegion* hr); |
4072 | 1237 |
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1238 size_t non_young_capacity_bytes() { |
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1239 return _old_set.total_capacity_bytes() + _humongous_set.total_capacity_bytes(); |
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1240 } |
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1241 |
2152 | 1242 void set_free_regions_coming(); |
1243 void reset_free_regions_coming(); | |
1244 bool free_regions_coming() { return _free_regions_coming; } | |
1245 void wait_while_free_regions_coming(); | |
342 | 1246 |
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1247 // Determine whether the given region is one that we are using as an |
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1248 // old GC alloc region. |
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1249 bool is_old_gc_alloc_region(HeapRegion* hr) { |
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1250 return hr == _retained_old_gc_alloc_region; |
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1251 } |
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1252 |
342 | 1253 // Perform a collection of the heap; intended for use in implementing |
1254 // "System.gc". This probably implies as full a collection as the | |
1255 // "CollectedHeap" supports. | |
1256 virtual void collect(GCCause::Cause cause); | |
1257 | |
1258 // The same as above but assume that the caller holds the Heap_lock. | |
1259 void collect_locked(GCCause::Cause cause); | |
1260 | |
10405 | 1261 // True iff an evacuation has failed in the most-recent collection. |
342 | 1262 bool evacuation_failed() { return _evacuation_failed; } |
1263 | |
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1264 void remove_from_old_sets(const HeapRegionSetCount& old_regions_removed, const HeapRegionSetCount& humongous_regions_removed); |
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1265 void prepend_to_freelist(FreeRegionList* list); |
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1266 void decrement_summary_bytes(size_t bytes); |
342 | 1267 |
4708 | 1268 // Returns "TRUE" iff "p" points into the committed areas of the heap. |
342 | 1269 virtual bool is_in(const void* p) const; |
1270 | |
1271 // Return "TRUE" iff the given object address is within the collection | |
1272 // set. | |
1273 inline bool obj_in_cs(oop obj); | |
1274 | |
1275 // Return "TRUE" iff the given object address is in the reserved | |
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1276 // region of g1. |
342 | 1277 bool is_in_g1_reserved(const void* p) const { |
1278 return _g1_reserved.contains(p); | |
1279 } | |
1280 | |
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1281 // Returns a MemRegion that corresponds to the space that has been |
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1282 // reserved for the heap |
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1283 MemRegion g1_reserved() { |
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1284 return _g1_reserved; |
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1285 } |
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1286 |
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1287 // Returns a MemRegion that corresponds to the space that has been |
342 | 1288 // committed in the heap |
1289 MemRegion g1_committed() { | |
1290 return _g1_committed; | |
1291 } | |
1292 | |
2311 | 1293 virtual bool is_in_closed_subset(const void* p) const; |
342 | 1294 |
12343 | 1295 G1SATBCardTableModRefBS* g1_barrier_set() { |
1296 return (G1SATBCardTableModRefBS*) barrier_set(); | |
1297 } | |
1298 | |
342 | 1299 // This resets the card table to all zeros. It is used after |
1300 // a collection pause which used the card table to claim cards. | |
1301 void cleanUpCardTable(); | |
1302 | |
1303 // Iteration functions. | |
1304 | |
1305 // Iterate over all the ref-containing fields of all objects, calling | |
1306 // "cl.do_oop" on each. | |
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1307 virtual void oop_iterate(ExtendedOopClosure* cl); |
342 | 1308 |
1309 // Same as above, restricted to a memory region. | |
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1310 void oop_iterate(MemRegion mr, ExtendedOopClosure* cl); |
342 | 1311 |
1312 // Iterate over all objects, calling "cl.do_object" on each. | |
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1313 virtual void object_iterate(ObjectClosure* cl); |
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1314 |
678 | 1315 virtual void safe_object_iterate(ObjectClosure* cl) { |
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1316 object_iterate(cl); |
678 | 1317 } |
342 | 1318 |
1319 // Iterate over all spaces in use in the heap, in ascending address order. | |
1320 virtual void space_iterate(SpaceClosure* cl); | |
1321 | |
1322 // Iterate over heap regions, in address order, terminating the | |
1323 // iteration early if the "doHeapRegion" method returns "true". | |
3766 | 1324 void heap_region_iterate(HeapRegionClosure* blk) const; |
342 | 1325 |
3766 | 1326 // Return the region with the given index. It assumes the index is valid. |
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1327 inline HeapRegion* region_at(uint index) const; |
342 | 1328 |
1329 // Divide the heap region sequence into "chunks" of some size (the number | |
1330 // of regions divided by the number of parallel threads times some | |
1331 // overpartition factor, currently 4). Assumes that this will be called | |
1332 // in parallel by ParallelGCThreads worker threads with discinct worker | |
1333 // ids in the range [0..max(ParallelGCThreads-1, 1)], that all parallel | |
1334 // calls will use the same "claim_value", and that that claim value is | |
1335 // different from the claim_value of any heap region before the start of | |
1336 // the iteration. Applies "blk->doHeapRegion" to each of the regions, by | |
1337 // attempting to claim the first region in each chunk, and, if | |
1338 // successful, applying the closure to each region in the chunk (and | |
1339 // setting the claim value of the second and subsequent regions of the | |
1340 // chunk.) For now requires that "doHeapRegion" always returns "false", | |
1341 // i.e., that a closure never attempt to abort a traversal. | |
1342 void heap_region_par_iterate_chunked(HeapRegionClosure* blk, | |
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1343 uint worker, |
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1344 uint no_of_par_workers, |
342 | 1345 jint claim_value); |
1346 | |
390 | 1347 // It resets all the region claim values to the default. |
1348 void reset_heap_region_claim_values(); | |
1349 | |
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1350 // Resets the claim values of regions in the current |
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1351 // collection set to the default. |
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1352 void reset_cset_heap_region_claim_values(); |
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1353 |
355 | 1354 #ifdef ASSERT |
1355 bool check_heap_region_claim_values(jint claim_value); | |
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1356 |
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1357 // Same as the routine above but only checks regions in the |
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1358 // current collection set. |
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1359 bool check_cset_heap_region_claim_values(jint claim_value); |
355 | 1360 #endif // ASSERT |
1361 | |
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1362 // Clear the cached cset start regions and (more importantly) |
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1363 // the time stamps. Called when we reset the GC time stamp. |
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1364 void clear_cset_start_regions(); |
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1365 |
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1366 // Given the id of a worker, obtain or calculate a suitable |
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1367 // starting region for iterating over the current collection set. |
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1368 HeapRegion* start_cset_region_for_worker(uint worker_i); |
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1369 |
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1370 // This is a convenience method that is used by the |
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1371 // HeapRegionIterator classes to calculate the starting region for |
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1372 // each worker so that they do not all start from the same region. |
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1373 HeapRegion* start_region_for_worker(uint worker_i, uint no_of_par_workers); |
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1374 |
342 | 1375 // Iterate over the regions (if any) in the current collection set. |
1376 void collection_set_iterate(HeapRegionClosure* blk); | |
1377 | |
1378 // As above but starting from region r | |
1379 void collection_set_iterate_from(HeapRegion* r, HeapRegionClosure *blk); | |
1380 | |
1381 // Returns the first (lowest address) compactible space in the heap. | |
1382 virtual CompactibleSpace* first_compactible_space(); | |
1383 | |
1384 // A CollectedHeap will contain some number of spaces. This finds the | |
1385 // space containing a given address, or else returns NULL. | |
1386 virtual Space* space_containing(const void* addr) const; | |
1387 | |
1388 // A G1CollectedHeap will contain some number of heap regions. This | |
1389 // finds the region containing a given address, or else returns NULL. | |
3766 | 1390 template <class T> |
1391 inline HeapRegion* heap_region_containing(const T addr) const; | |
342 | 1392 |
1393 // Like the above, but requires "addr" to be in the heap (to avoid a | |
1394 // null-check), and unlike the above, may return an continuing humongous | |
1395 // region. | |
3766 | 1396 template <class T> |
1397 inline HeapRegion* heap_region_containing_raw(const T addr) const; | |
342 | 1398 |
1399 // A CollectedHeap is divided into a dense sequence of "blocks"; that is, | |
1400 // each address in the (reserved) heap is a member of exactly | |
1401 // one block. The defining characteristic of a block is that it is | |
1402 // possible to find its size, and thus to progress forward to the next | |
1403 // block. (Blocks may be of different sizes.) Thus, blocks may | |
1404 // represent Java objects, or they might be free blocks in a | |
1405 // free-list-based heap (or subheap), as long as the two kinds are | |
1406 // distinguishable and the size of each is determinable. | |
1407 | |
1408 // Returns the address of the start of the "block" that contains the | |
1409 // address "addr". We say "blocks" instead of "object" since some heaps | |
1410 // may not pack objects densely; a chunk may either be an object or a | |
1411 // non-object. | |
1412 virtual HeapWord* block_start(const void* addr) const; | |
1413 | |
1414 // Requires "addr" to be the start of a chunk, and returns its size. | |
1415 // "addr + size" is required to be the start of a new chunk, or the end | |
1416 // of the active area of the heap. | |
1417 virtual size_t block_size(const HeapWord* addr) const; | |
1418 | |
1419 // Requires "addr" to be the start of a block, and returns "TRUE" iff | |
1420 // the block is an object. | |
1421 virtual bool block_is_obj(const HeapWord* addr) const; | |
1422 | |
1423 // Does this heap support heap inspection? (+PrintClassHistogram) | |
1424 virtual bool supports_heap_inspection() const { return true; } | |
1425 | |
1426 // Section on thread-local allocation buffers (TLABs) | |
1427 // See CollectedHeap for semantics. | |
1428 | |
17727 | 1429 bool supports_tlab_allocation() const; |
1430 size_t tlab_capacity(Thread* ignored) const; | |
1431 size_t tlab_used(Thread* ignored) const; | |
1432 size_t max_tlab_size() const; | |
1433 size_t unsafe_max_tlab_alloc(Thread* ignored) const; | |
342 | 1434 |
1435 // Can a compiler initialize a new object without store barriers? | |
1436 // This permission only extends from the creation of a new object | |
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1437 // via a TLAB up to the first subsequent safepoint. If such permission |
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1438 // is granted for this heap type, the compiler promises to call |
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1439 // defer_store_barrier() below on any slow path allocation of |
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1440 // a new object for which such initializing store barriers will |
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1441 // have been elided. G1, like CMS, allows this, but should be |
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1442 // ready to provide a compensating write barrier as necessary |
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1443 // if that storage came out of a non-young region. The efficiency |
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1444 // of this implementation depends crucially on being able to |
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1445 // answer very efficiently in constant time whether a piece of |
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1446 // storage in the heap comes from a young region or not. |
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1447 // See ReduceInitialCardMarks. |
342 | 1448 virtual bool can_elide_tlab_store_barriers() const { |
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1449 return true; |
1027
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1450 } |
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1451 |
1166 | 1452 virtual bool card_mark_must_follow_store() const { |
1453 return true; | |
1454 } | |
1455 | |
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1456 inline bool is_in_young(const oop obj); |
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1457 |
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1458 #ifdef ASSERT |
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1459 virtual bool is_in_partial_collection(const void* p); |
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1460 #endif |
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1461 |
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1462 virtual bool is_scavengable(const void* addr); |
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1463 |
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1464 // We don't need barriers for initializing stores to objects |
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1465 // in the young gen: for the SATB pre-barrier, there is no |
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1466 // pre-value that needs to be remembered; for the remembered-set |
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1467 // update logging post-barrier, we don't maintain remembered set |
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1468 // information for young gen objects. |
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1469 virtual inline bool can_elide_initializing_store_barrier(oop new_obj); |
342 | 1470 |
1471 // Returns "true" iff the given word_size is "very large". | |
1472 static bool isHumongous(size_t word_size) { | |
1313
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1473 // Note this has to be strictly greater-than as the TLABs |
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1474 // are capped at the humongous thresold and we want to |
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1475 // ensure that we don't try to allocate a TLAB as |
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1476 // humongous and that we don't allocate a humongous |
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1477 // object in a TLAB. |
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1478 return word_size > _humongous_object_threshold_in_words; |
342 | 1479 } |
1480 | |
1481 // Update mod union table with the set of dirty cards. | |
1482 void updateModUnion(); | |
1483 | |
1484 // Set the mod union bits corresponding to the given memRegion. Note | |
1485 // that this is always a safe operation, since it doesn't clear any | |
1486 // bits. | |
1487 void markModUnionRange(MemRegion mr); | |
1488 | |
1489 // Records the fact that a marking phase is no longer in progress. | |
1490 void set_marking_complete() { | |
1491 _mark_in_progress = false; | |
1492 } | |
1493 void set_marking_started() { | |
1494 _mark_in_progress = true; | |
1495 } | |
1496 bool mark_in_progress() { | |
1497 return _mark_in_progress; | |
1498 } | |
1499 | |
1500 // Print the maximum heap capacity. | |
1501 virtual size_t max_capacity() const; | |
1502 | |
1503 virtual jlong millis_since_last_gc(); | |
1504 | |
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1505 |
342 | 1506 // Convenience function to be used in situations where the heap type can be |
1507 // asserted to be this type. | |
1508 static G1CollectedHeap* heap(); | |
1509 | |
1510 void set_region_short_lived_locked(HeapRegion* hr); | |
1511 // add appropriate methods for any other surv rate groups | |
1512 | |
17727 | 1513 YoungList* young_list() const { return _young_list; } |
342 | 1514 |
1515 // debugging | |
1516 bool check_young_list_well_formed() { | |
1517 return _young_list->check_list_well_formed(); | |
1518 } | |
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1519 |
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1520 bool check_young_list_empty(bool check_heap, |
342 | 1521 bool check_sample = true); |
1522 | |
1523 // *** Stuff related to concurrent marking. It's not clear to me that so | |
1524 // many of these need to be public. | |
1525 | |
1526 // The functions below are helper functions that a subclass of | |
1527 // "CollectedHeap" can use in the implementation of its virtual | |
1528 // functions. | |
1529 // This performs a concurrent marking of the live objects in a | |
1530 // bitmap off to the side. | |
1531 void doConcurrentMark(); | |
1532 | |
1533 bool isMarkedPrev(oop obj) const; | |
1534 bool isMarkedNext(oop obj) const; | |
1535 | |
1536 // Determine if an object is dead, given the object and also | |
1537 // the region to which the object belongs. An object is dead | |
1538 // iff a) it was not allocated since the last mark and b) it | |
1539 // is not marked. | |
1540 | |
1541 bool is_obj_dead(const oop obj, const HeapRegion* hr) const { | |
1542 return | |
1543 !hr->obj_allocated_since_prev_marking(obj) && | |
1544 !isMarkedPrev(obj); | |
1545 } | |
1546 | |
1547 // This function returns true when an object has been | |
1548 // around since the previous marking and hasn't yet | |
1549 // been marked during this marking. | |
1550 | |
1551 bool is_obj_ill(const oop obj, const HeapRegion* hr) const { | |
1552 return | |
1553 !hr->obj_allocated_since_next_marking(obj) && | |
1554 !isMarkedNext(obj); | |
1555 } | |
1556 | |
1557 // Determine if an object is dead, given only the object itself. | |
1558 // This will find the region to which the object belongs and | |
1559 // then call the region version of the same function. | |
1560 | |
1561 // Added if it is NULL it isn't dead. | |
1562 | |
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1563 inline bool is_obj_dead(const oop obj) const; |
342 | 1564 |
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1565 inline bool is_obj_ill(const oop obj) const; |
342 | 1566 |
12080 | 1567 bool allocated_since_marking(oop obj, HeapRegion* hr, VerifyOption vo); |
1568 HeapWord* top_at_mark_start(HeapRegion* hr, VerifyOption vo); | |
1569 bool is_marked(oop obj, VerifyOption vo); | |
1570 const char* top_at_mark_start_str(VerifyOption vo); | |
1571 | |
1572 ConcurrentMark* concurrent_mark() const { return _cm; } | |
1573 | |
1574 // Refinement | |
1575 | |
1576 ConcurrentG1Refine* concurrent_g1_refine() const { return _cg1r; } | |
1577 | |
1578 // The dirty cards region list is used to record a subset of regions | |
1579 // whose cards need clearing. The list if populated during the | |
1580 // remembered set scanning and drained during the card table | |
1581 // cleanup. Although the methods are reentrant, population/draining | |
1582 // phases must not overlap. For synchronization purposes the last | |
1583 // element on the list points to itself. | |
1584 HeapRegion* _dirty_cards_region_list; | |
1585 void push_dirty_cards_region(HeapRegion* hr); | |
1586 HeapRegion* pop_dirty_cards_region(); | |
1587 | |
1588 // Optimized nmethod scanning support routines | |
1589 | |
1590 // Register the given nmethod with the G1 heap | |
1591 virtual void register_nmethod(nmethod* nm); | |
1592 | |
1593 // Unregister the given nmethod from the G1 heap | |
1594 virtual void unregister_nmethod(nmethod* nm); | |
1595 | |
1596 // Migrate the nmethods in the code root lists of the regions | |
1597 // in the collection set to regions in to-space. In the event | |
1598 // of an evacuation failure, nmethods that reference objects | |
1599 // that were not successfullly evacuated are not migrated. | |
1600 void migrate_strong_code_roots(); | |
1601 | |
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1602 // Free up superfluous code root memory. |
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1603 void purge_code_root_memory(); |
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1604 |
12080 | 1605 // During an initial mark pause, mark all the code roots that |
1606 // point into regions *not* in the collection set. | |
1607 void mark_strong_code_roots(uint worker_id); | |
1608 | |
1609 // Rebuild the stong code root lists for each region | |
1610 // after a full GC | |
1611 void rebuild_strong_code_roots(); | |
1612 | |
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1613 // Delete entries for dead interned string and clean up unreferenced symbols |
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1614 // in symbol table, possibly in parallel. |
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1615 void unlink_string_and_symbol_table(BoolObjectClosure* is_alive, bool unlink_strings = true, bool unlink_symbols = true); |
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1616 |
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1617 // Redirty logged cards in the refinement queue. |
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1618 void redirty_logged_cards(); |
12080 | 1619 // Verification |
1620 | |
1621 // The following is just to alert the verification code | |
1622 // that a full collection has occurred and that the | |
1623 // remembered sets are no longer up to date. | |
1624 bool _full_collection; | |
1625 void set_full_collection() { _full_collection = true;} | |
1626 void clear_full_collection() {_full_collection = false;} | |
1627 bool full_collection() {return _full_collection;} | |
1628 | |
1629 // Perform any cleanup actions necessary before allowing a verification. | |
1630 virtual void prepare_for_verify(); | |
1631 | |
1632 // Perform verification. | |
1633 | |
1634 // vo == UsePrevMarking -> use "prev" marking information, | |
1635 // vo == UseNextMarking -> use "next" marking information | |
1636 // vo == UseMarkWord -> use the mark word in the object header | |
1637 // | |
1638 // NOTE: Only the "prev" marking information is guaranteed to be | |
1639 // consistent most of the time, so most calls to this should use | |
1640 // vo == UsePrevMarking. | |
1641 // Currently, there is only one case where this is called with | |
1642 // vo == UseNextMarking, which is to verify the "next" marking | |
1643 // information at the end of remark. | |
1644 // Currently there is only one place where this is called with | |
1645 // vo == UseMarkWord, which is to verify the marking during a | |
1646 // full GC. | |
1647 void verify(bool silent, VerifyOption vo); | |
1648 | |
1649 // Override; it uses the "prev" marking information | |
1650 virtual void verify(bool silent); | |
1651 | |
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1652 // The methods below are here for convenience and dispatch the |
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1653 // appropriate method depending on value of the given VerifyOption |
12080 | 1654 // parameter. The values for that parameter, and their meanings, |
1655 // are the same as those above. | |
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1656 |
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1657 bool is_obj_dead_cond(const oop obj, |
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1658 const HeapRegion* hr, |
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1659 const VerifyOption vo) const; |
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1660 |
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1661 bool is_obj_dead_cond(const oop obj, |
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1662 const VerifyOption vo) const; |
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1663 |
12080 | 1664 // Printing |
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1665 |
12080 | 1666 virtual void print_on(outputStream* st) const; |
1667 virtual void print_extended_on(outputStream* st) const; | |
1668 virtual void print_on_error(outputStream* st) const; | |
342 | 1669 |
12080 | 1670 virtual void print_gc_threads_on(outputStream* st) const; |
1671 virtual void gc_threads_do(ThreadClosure* tc) const; | |
342 | 1672 |
12080 | 1673 // Override |
1674 void print_tracing_info() const; | |
1675 | |
1676 // The following two methods are helpful for debugging RSet issues. | |
1677 void print_cset_rsets() PRODUCT_RETURN; | |
1678 void print_all_rsets() PRODUCT_RETURN; | |
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1679 |
342 | 1680 public: |
1681 size_t pending_card_num(); | |
1682 size_t cards_scanned(); | |
1683 | |
1684 protected: | |
1685 size_t _max_heap_capacity; | |
1686 }; | |
1687 | |
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1688 class G1ParGCAllocBuffer: public ParGCAllocBuffer { |
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1689 private: |
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1690 bool _retired; |
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1691 |
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1692 public: |
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1693 G1ParGCAllocBuffer(size_t gclab_word_size); |
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1694 virtual ~G1ParGCAllocBuffer() { |
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1695 guarantee(_retired, "Allocation buffer has not been retired"); |
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1696 } |
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1697 |
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1698 virtual void set_buf(HeapWord* buf) { |
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1699 ParGCAllocBuffer::set_buf(buf); |
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1700 _retired = false; |
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1701 } |
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1702 |
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1703 virtual void retire(bool end_of_gc, bool retain) { |
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1704 if (_retired) { |
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1705 return; |
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1706 } |
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1707 ParGCAllocBuffer::retire(end_of_gc, retain); |
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1708 _retired = true; |
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1709 } |
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1710 }; |
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1711 |
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1712 class G1ParScanThreadState : public StackObj { |
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1713 protected: |
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1714 G1CollectedHeap* _g1h; |
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1715 RefToScanQueue* _refs; |
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1716 DirtyCardQueue _dcq; |
12343 | 1717 G1SATBCardTableModRefBS* _ct_bs; |
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1718 G1RemSet* _g1_rem; |
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1719 |
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1720 G1ParGCAllocBuffer _surviving_alloc_buffer; |
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1721 G1ParGCAllocBuffer _tenured_alloc_buffer; |
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1722 G1ParGCAllocBuffer* _alloc_buffers[GCAllocPurposeCount]; |
1391
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1723 ageTable _age_table; |
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1724 |
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|
1725 G1ParScanClosure _scanner; |
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1726 |
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1727 size_t _alloc_buffer_waste; |
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|
1728 size_t _undo_waste; |
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1729 |
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1730 OopsInHeapRegionClosure* _evac_failure_cl; |
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1731 |
10405 | 1732 int _hash_seed; |
4836
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|
1733 uint _queue_num; |
845
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1734 |
1611 | 1735 size_t _term_attempts; |
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1736 |
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1737 double _start; |
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|
1738 double _start_strong_roots; |
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|
1739 double _strong_roots_time; |
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|
1740 double _start_term; |
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|
1741 double _term_time; |
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1742 |
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1743 // Map from young-age-index (0 == not young, 1 is youngest) to |
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1744 // surviving words. base is what we get back from the malloc call |
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1745 size_t* _surviving_young_words_base; |
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1746 // this points into the array, as we use the first few entries for padding |
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1747 size_t* _surviving_young_words; |
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1748 |
1709 | 1749 #define PADDING_ELEM_NUM (DEFAULT_CACHE_LINE_SIZE / sizeof(size_t)) |
845
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1750 |
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1751 void add_to_alloc_buffer_waste(size_t waste) { _alloc_buffer_waste += waste; } |
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1752 |
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1753 void add_to_undo_waste(size_t waste) { _undo_waste += waste; } |
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1754 |
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1755 DirtyCardQueue& dirty_card_queue() { return _dcq; } |
12343 | 1756 G1SATBCardTableModRefBS* ctbs() { return _ct_bs; } |
845
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1757 |
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1758 template <class T> inline void immediate_rs_update(HeapRegion* from, T* p, int tid); |
845
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1759 |
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|
1760 template <class T> void deferred_rs_update(HeapRegion* from, T* p, int tid) { |
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1761 // If the new value of the field points to the same region or |
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1762 // is the to-space, we don't need to include it in the Rset updates. |
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1763 if (!from->is_in_reserved(oopDesc::load_decode_heap_oop(p)) && !from->is_survivor()) { |
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1764 size_t card_index = ctbs()->index_for(p); |
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1765 // If the card hasn't been added to the buffer, do it. |
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1766 if (ctbs()->mark_card_deferred(card_index)) { |
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1767 dirty_card_queue().enqueue((jbyte*)ctbs()->byte_for_index(card_index)); |
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1768 } |
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1769 } |
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|
1770 } |
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1771 |
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1772 public: |
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1773 G1ParScanThreadState(G1CollectedHeap* g1h, uint queue_num, ReferenceProcessor* rp); |
845
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1774 |
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1775 ~G1ParScanThreadState() { |
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1776 retire_alloc_buffers(); |
6197 | 1777 FREE_C_HEAP_ARRAY(size_t, _surviving_young_words_base, mtGC); |
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1778 } |
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1779 |
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1780 RefToScanQueue* refs() { return _refs; } |
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1781 ageTable* age_table() { return &_age_table; } |
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1782 |
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1783 G1ParGCAllocBuffer* alloc_buffer(GCAllocPurpose purpose) { |
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1784 return _alloc_buffers[purpose]; |
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1785 } |
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1786 |
1709 | 1787 size_t alloc_buffer_waste() const { return _alloc_buffer_waste; } |
1788 size_t undo_waste() const { return _undo_waste; } | |
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1789 |
1862
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1790 #ifdef ASSERT |
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1791 bool verify_ref(narrowOop* ref) const; |
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1792 bool verify_ref(oop* ref) const; |
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1793 bool verify_task(StarTask ref) const; |
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1794 #endif // ASSERT |
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1795 |
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1796 template <class T> void push_on_queue(T* ref) { |
1862
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1797 assert(verify_ref(ref), "sanity"); |
1709 | 1798 refs()->push(ref); |
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1799 } |
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1800 |
17833
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1801 template <class T> inline void update_rs(HeapRegion* from, T* p, int tid); |
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1802 |
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1803 HeapWord* allocate_slow(GCAllocPurpose purpose, size_t word_sz) { |
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1804 HeapWord* obj = NULL; |
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1805 size_t gclab_word_size = _g1h->desired_plab_sz(purpose); |
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1806 if (word_sz * 100 < gclab_word_size * ParallelGCBufferWastePct) { |
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1807 G1ParGCAllocBuffer* alloc_buf = alloc_buffer(purpose); |
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1808 add_to_alloc_buffer_waste(alloc_buf->words_remaining()); |
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1809 alloc_buf->retire(false /* end_of_gc */, false /* retain */); |
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1810 |
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1811 HeapWord* buf = _g1h->par_allocate_during_gc(purpose, gclab_word_size); |
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1812 if (buf == NULL) return NULL; // Let caller handle allocation failure. |
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1813 // Otherwise. |
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1814 alloc_buf->set_word_size(gclab_word_size); |
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1815 alloc_buf->set_buf(buf); |
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1816 |
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1817 obj = alloc_buf->allocate(word_sz); |
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1818 assert(obj != NULL, "buffer was definitely big enough..."); |
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1819 } else { |
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1820 obj = _g1h->par_allocate_during_gc(purpose, word_sz); |
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1821 } |
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1822 return obj; |
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1823 } |
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1824 |
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1825 HeapWord* allocate(GCAllocPurpose purpose, size_t word_sz) { |
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1826 HeapWord* obj = alloc_buffer(purpose)->allocate(word_sz); |
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1827 if (obj != NULL) return obj; |
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1828 return allocate_slow(purpose, word_sz); |
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1829 } |
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1830 |
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1831 void undo_allocation(GCAllocPurpose purpose, HeapWord* obj, size_t word_sz) { |
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1832 if (alloc_buffer(purpose)->contains(obj)) { |
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1833 assert(alloc_buffer(purpose)->contains(obj + word_sz - 1), |
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1834 "should contain whole object"); |
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1835 alloc_buffer(purpose)->undo_allocation(obj, word_sz); |
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1836 } else { |
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1837 CollectedHeap::fill_with_object(obj, word_sz); |
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1838 add_to_undo_waste(word_sz); |
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1839 } |
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1840 } |
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1841 |
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1842 void set_evac_failure_closure(OopsInHeapRegionClosure* evac_failure_cl) { |
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1843 _evac_failure_cl = evac_failure_cl; |
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1844 } |
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1845 OopsInHeapRegionClosure* evac_failure_closure() { |
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1846 return _evac_failure_cl; |
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1847 } |
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1848 |
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1849 int* hash_seed() { return &_hash_seed; } |
4836
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1850 uint queue_num() { return _queue_num; } |
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1851 |
1709 | 1852 size_t term_attempts() const { return _term_attempts; } |
1611 | 1853 void note_term_attempt() { _term_attempts++; } |
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1854 |
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1855 void start_strong_roots() { |
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1856 _start_strong_roots = os::elapsedTime(); |
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1857 } |
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1858 void end_strong_roots() { |
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1859 _strong_roots_time += (os::elapsedTime() - _start_strong_roots); |
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1860 } |
1709 | 1861 double strong_roots_time() const { return _strong_roots_time; } |
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1862 |
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1863 void start_term_time() { |
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1864 note_term_attempt(); |
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1865 _start_term = os::elapsedTime(); |
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1866 } |
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1867 void end_term_time() { |
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1868 _term_time += (os::elapsedTime() - _start_term); |
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1869 } |
1709 | 1870 double term_time() const { return _term_time; } |
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1871 |
1709 | 1872 double elapsed_time() const { |
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1873 return os::elapsedTime() - _start; |
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1874 } |
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1875 |
1709 | 1876 static void |
1877 print_termination_stats_hdr(outputStream* const st = gclog_or_tty); | |
1878 void | |
1879 print_termination_stats(int i, outputStream* const st = gclog_or_tty) const; | |
1880 | |
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1881 size_t* surviving_young_words() { |
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1882 // We add on to hide entry 0 which accumulates surviving words for |
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1883 // age -1 regions (i.e. non-young ones) |
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1884 return _surviving_young_words; |
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1885 } |
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1886 |
20215
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1887 private: |
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1888 void retire_alloc_buffers() { |
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1889 for (int ap = 0; ap < GCAllocPurposeCount; ++ap) { |
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1890 size_t waste = _alloc_buffers[ap]->words_remaining(); |
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1891 add_to_alloc_buffer_waste(waste); |
6595 | 1892 _alloc_buffers[ap]->flush_stats_and_retire(_g1h->stats_for_purpose((GCAllocPurpose)ap), |
1893 true /* end_of_gc */, | |
1894 false /* retain */); | |
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1895 } |
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1896 } |
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1897 |
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1898 #define G1_PARTIAL_ARRAY_MASK 0x2 |
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1899 |
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1900 inline bool has_partial_array_mask(oop* ref) const { |
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1901 return ((uintptr_t)ref & G1_PARTIAL_ARRAY_MASK) == G1_PARTIAL_ARRAY_MASK; |
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1902 } |
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1903 |
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1904 // We never encode partial array oops as narrowOop*, so return false immediately. |
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1905 // This allows the compiler to create optimized code when popping references from |
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1906 // the work queue. |
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1907 inline bool has_partial_array_mask(narrowOop* ref) const { |
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1908 assert(((uintptr_t)ref & G1_PARTIAL_ARRAY_MASK) != G1_PARTIAL_ARRAY_MASK, "Partial array oop reference encoded as narrowOop*"); |
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1909 return false; |
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1910 } |
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1911 |
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1912 // Only implement set_partial_array_mask() for regular oops, not for narrowOops. |
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1913 // We always encode partial arrays as regular oop, to allow the |
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1914 // specialization for has_partial_array_mask() for narrowOops above. |
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1915 // This means that unintentional use of this method with narrowOops are caught |
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1916 // by the compiler. |
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1917 inline oop* set_partial_array_mask(oop obj) const { |
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1918 assert(((uintptr_t)(void *)obj & G1_PARTIAL_ARRAY_MASK) == 0, "Information loss!"); |
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1919 return (oop*) ((uintptr_t)(void *)obj | G1_PARTIAL_ARRAY_MASK); |
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1920 } |
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1921 |
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1922 inline oop clear_partial_array_mask(oop* ref) const { |
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1923 return cast_to_oop((intptr_t)ref & ~G1_PARTIAL_ARRAY_MASK); |
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1924 } |
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1925 |
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1926 inline void do_oop_partial_array(oop* p); |
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1927 |
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1928 // This method is applied to the fields of the objects that have just been copied. |
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1929 template <class T> void do_oop_evac(T* p, HeapRegion* from) { |
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1930 assert(!oopDesc::is_null(oopDesc::load_decode_heap_oop(p)), |
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1931 "Reference should not be NULL here as such are never pushed to the task queue."); |
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1932 oop obj = oopDesc::load_decode_heap_oop_not_null(p); |
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1933 |
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1934 // Although we never intentionally push references outside of the collection |
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1935 // set, due to (benign) races in the claim mechanism during RSet scanning more |
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1936 // than one thread might claim the same card. So the same card may be |
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1937 // processed multiple times. So redo this check. |
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1938 if (_g1h->in_cset_fast_test(obj)) { |
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1939 oop forwardee; |
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1940 if (obj->is_forwarded()) { |
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1941 forwardee = obj->forwardee(); |
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1942 } else { |
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1943 forwardee = copy_to_survivor_space(obj); |
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1944 } |
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1945 assert(forwardee != NULL, "forwardee should not be NULL"); |
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1946 oopDesc::encode_store_heap_oop(p, forwardee); |
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1947 } |
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1948 |
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1949 assert(obj != NULL, "Must be"); |
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1950 update_rs(from, p, queue_num()); |
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1951 } |
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1952 public: |
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1953 |
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1954 oop copy_to_survivor_space(oop const obj); |
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1955 |
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1956 template <class T> inline void deal_with_reference(T* ref_to_scan); |
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1957 |
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1958 inline void deal_with_reference(StarTask ref); |
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1959 |
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1960 public: |
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1961 void trim_queue(); |
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1962 }; |
1972 | 1963 |
1964 #endif // SHARE_VM_GC_IMPLEMENTATION_G1_G1COLLECTEDHEAP_HPP |