Mercurial > hg > truffle
annotate src/share/vm/gc_implementation/g1/g1CollectedHeap.hpp @ 6628:bb3f6194fedb
7178363: G1: Remove the serial code for PrintGCDetails and make it a special case of the parallel code
Summary: Also reviewed by vitalyd@gmail.com. Introduced the WorkerDataArray class. Fixed some minor logging bugs.
Reviewed-by: johnc, mgerdin
author | brutisso |
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date | Thu, 23 Aug 2012 10:21:12 +0200 |
parents | 7383557659bd |
children | c9814fadeb38 |
rev | line source |
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342 | 1 /* |
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2 * Copyright (c) 2001, 2012, Oracle and/or its affiliates. All rights reserved. |
342 | 3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
4 * | |
5 * This code is free software; you can redistribute it and/or modify it | |
6 * under the terms of the GNU General Public License version 2 only, as | |
7 * published by the Free Software Foundation. | |
8 * | |
9 * This code is distributed in the hope that it will be useful, but WITHOUT | |
10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or | |
11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License | |
12 * version 2 for more details (a copy is included in the LICENSE file that | |
13 * accompanied this code). | |
14 * | |
15 * You should have received a copy of the GNU General Public License version | |
16 * 2 along with this work; if not, write to the Free Software Foundation, | |
17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. | |
18 * | |
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19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
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20 * or visit www.oracle.com if you need additional information or have any |
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21 * questions. |
342 | 22 * |
23 */ | |
24 | |
1972 | 25 #ifndef SHARE_VM_GC_IMPLEMENTATION_G1_G1COLLECTEDHEAP_HPP |
26 #define SHARE_VM_GC_IMPLEMENTATION_G1_G1COLLECTEDHEAP_HPP | |
27 | |
28 #include "gc_implementation/g1/concurrentMark.hpp" | |
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29 #include "gc_implementation/g1/g1AllocRegion.hpp" |
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30 #include "gc_implementation/g1/g1HRPrinter.hpp" |
1972 | 31 #include "gc_implementation/g1/g1RemSet.hpp" |
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32 #include "gc_implementation/g1/g1MonitoringSupport.hpp" |
3766 | 33 #include "gc_implementation/g1/heapRegionSeq.hpp" |
2152 | 34 #include "gc_implementation/g1/heapRegionSets.hpp" |
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35 #include "gc_implementation/shared/hSpaceCounters.hpp" |
6595 | 36 #include "gc_implementation/shared/parGCAllocBuffer.hpp" |
1972 | 37 #include "memory/barrierSet.hpp" |
38 #include "memory/memRegion.hpp" | |
39 #include "memory/sharedHeap.hpp" | |
40 | |
342 | 41 // A "G1CollectedHeap" is an implementation of a java heap for HotSpot. |
42 // It uses the "Garbage First" heap organization and algorithm, which | |
43 // may combine concurrent marking with parallel, incremental compaction of | |
44 // heap subsets that will yield large amounts of garbage. | |
45 | |
46 class HeapRegion; | |
2173 | 47 class HRRSCleanupTask; |
342 | 48 class PermanentGenerationSpec; |
49 class GenerationSpec; | |
50 class OopsInHeapRegionClosure; | |
51 class G1ScanHeapEvacClosure; | |
52 class ObjectClosure; | |
53 class SpaceClosure; | |
54 class CompactibleSpaceClosure; | |
55 class Space; | |
56 class G1CollectorPolicy; | |
57 class GenRemSet; | |
58 class G1RemSet; | |
59 class HeapRegionRemSetIterator; | |
60 class ConcurrentMark; | |
61 class ConcurrentMarkThread; | |
62 class ConcurrentG1Refine; | |
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63 class GenerationCounters; |
342 | 64 |
6197 | 65 typedef OverflowTaskQueue<StarTask, mtGC> RefToScanQueue; |
66 typedef GenericTaskQueueSet<RefToScanQueue, mtGC> RefToScanQueueSet; | |
342 | 67 |
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68 typedef int RegionIdx_t; // needs to hold [ 0..max_regions() ) |
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69 typedef int CardIdx_t; // needs to hold [ 0..CardsPerRegion ) |
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70 |
342 | 71 enum GCAllocPurpose { |
72 GCAllocForTenured, | |
73 GCAllocForSurvived, | |
74 GCAllocPurposeCount | |
75 }; | |
76 | |
6197 | 77 class YoungList : public CHeapObj<mtGC> { |
342 | 78 private: |
79 G1CollectedHeap* _g1h; | |
80 | |
81 HeapRegion* _head; | |
82 | |
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83 HeapRegion* _survivor_head; |
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84 HeapRegion* _survivor_tail; |
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85 |
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86 HeapRegion* _curr; |
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87 |
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88 uint _length; |
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89 uint _survivor_length; |
342 | 90 |
91 size_t _last_sampled_rs_lengths; | |
92 size_t _sampled_rs_lengths; | |
93 | |
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94 void empty_list(HeapRegion* list); |
342 | 95 |
96 public: | |
97 YoungList(G1CollectedHeap* g1h); | |
98 | |
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99 void push_region(HeapRegion* hr); |
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100 void add_survivor_region(HeapRegion* hr); |
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101 |
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102 void empty_list(); |
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103 bool is_empty() { return _length == 0; } |
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104 uint length() { return _length; } |
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105 uint survivor_length() { return _survivor_length; } |
342 | 106 |
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107 // Currently we do not keep track of the used byte sum for the |
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108 // young list and the survivors and it'd be quite a lot of work to |
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109 // do so. When we'll eventually replace the young list with |
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110 // instances of HeapRegionLinkedList we'll get that for free. So, |
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111 // we'll report the more accurate information then. |
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112 size_t eden_used_bytes() { |
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113 assert(length() >= survivor_length(), "invariant"); |
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114 return (size_t) (length() - survivor_length()) * HeapRegion::GrainBytes; |
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115 } |
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116 size_t survivor_used_bytes() { |
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117 return (size_t) survivor_length() * HeapRegion::GrainBytes; |
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118 } |
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119 |
342 | 120 void rs_length_sampling_init(); |
121 bool rs_length_sampling_more(); | |
122 void rs_length_sampling_next(); | |
123 | |
124 void reset_sampled_info() { | |
125 _last_sampled_rs_lengths = 0; | |
126 } | |
127 size_t sampled_rs_lengths() { return _last_sampled_rs_lengths; } | |
128 | |
129 // for development purposes | |
130 void reset_auxilary_lists(); | |
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131 void clear() { _head = NULL; _length = 0; } |
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132 |
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133 void clear_survivors() { |
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134 _survivor_head = NULL; |
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135 _survivor_tail = NULL; |
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136 _survivor_length = 0; |
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137 } |
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138 |
342 | 139 HeapRegion* first_region() { return _head; } |
140 HeapRegion* first_survivor_region() { return _survivor_head; } | |
545 | 141 HeapRegion* last_survivor_region() { return _survivor_tail; } |
342 | 142 |
143 // debugging | |
144 bool check_list_well_formed(); | |
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145 bool check_list_empty(bool check_sample = true); |
342 | 146 void print(); |
147 }; | |
148 | |
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149 class MutatorAllocRegion : public G1AllocRegion { |
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150 protected: |
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151 virtual HeapRegion* allocate_new_region(size_t word_size, bool force); |
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152 virtual void retire_region(HeapRegion* alloc_region, size_t allocated_bytes); |
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153 public: |
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154 MutatorAllocRegion() |
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155 : G1AllocRegion("Mutator Alloc Region", false /* bot_updates */) { } |
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156 }; |
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157 |
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158 // The G1 STW is alive closure. |
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159 // An instance is embedded into the G1CH and used as the |
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160 // (optional) _is_alive_non_header closure in the STW |
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161 // reference processor. It is also extensively used during |
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162 // refence processing during STW evacuation pauses. |
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163 class G1STWIsAliveClosure: public BoolObjectClosure { |
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164 G1CollectedHeap* _g1; |
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165 public: |
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166 G1STWIsAliveClosure(G1CollectedHeap* g1) : _g1(g1) {} |
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167 void do_object(oop p) { assert(false, "Do not call."); } |
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168 bool do_object_b(oop p); |
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169 }; |
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170 |
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171 class SurvivorGCAllocRegion : public G1AllocRegion { |
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172 protected: |
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173 virtual HeapRegion* allocate_new_region(size_t word_size, bool force); |
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174 virtual void retire_region(HeapRegion* alloc_region, size_t allocated_bytes); |
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175 public: |
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176 SurvivorGCAllocRegion() |
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177 : G1AllocRegion("Survivor GC Alloc Region", false /* bot_updates */) { } |
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178 }; |
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179 |
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180 class OldGCAllocRegion : public G1AllocRegion { |
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181 protected: |
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182 virtual HeapRegion* allocate_new_region(size_t word_size, bool force); |
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183 virtual void retire_region(HeapRegion* alloc_region, size_t allocated_bytes); |
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184 public: |
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185 OldGCAllocRegion() |
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186 : G1AllocRegion("Old GC Alloc Region", true /* bot_updates */) { } |
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187 }; |
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188 |
342 | 189 class RefineCardTableEntryClosure; |
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190 |
342 | 191 class G1CollectedHeap : public SharedHeap { |
192 friend class VM_G1CollectForAllocation; | |
193 friend class VM_GenCollectForPermanentAllocation; | |
194 friend class VM_G1CollectFull; | |
195 friend class VM_G1IncCollectionPause; | |
196 friend class VMStructs; | |
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197 friend class MutatorAllocRegion; |
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198 friend class SurvivorGCAllocRegion; |
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199 friend class OldGCAllocRegion; |
342 | 200 |
201 // Closures used in implementation. | |
5987 | 202 template <bool do_gen_barrier, G1Barrier barrier, bool do_mark_object> |
203 friend class G1ParCopyClosure; | |
342 | 204 friend class G1IsAliveClosure; |
205 friend class G1EvacuateFollowersClosure; | |
206 friend class G1ParScanThreadState; | |
207 friend class G1ParScanClosureSuper; | |
208 friend class G1ParEvacuateFollowersClosure; | |
209 friend class G1ParTask; | |
210 friend class G1FreeGarbageRegionClosure; | |
211 friend class RefineCardTableEntryClosure; | |
212 friend class G1PrepareCompactClosure; | |
213 friend class RegionSorter; | |
2152 | 214 friend class RegionResetter; |
342 | 215 friend class CountRCClosure; |
216 friend class EvacPopObjClosure; | |
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217 friend class G1ParCleanupCTTask; |
342 | 218 |
219 // Other related classes. | |
220 friend class G1MarkSweep; | |
221 | |
222 private: | |
223 // The one and only G1CollectedHeap, so static functions can find it. | |
224 static G1CollectedHeap* _g1h; | |
225 | |
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226 static size_t _humongous_object_threshold_in_words; |
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227 |
342 | 228 // Storage for the G1 heap (excludes the permanent generation). |
229 VirtualSpace _g1_storage; | |
230 MemRegion _g1_reserved; | |
231 | |
232 // The part of _g1_storage that is currently committed. | |
233 MemRegion _g1_committed; | |
234 | |
2152 | 235 // The master free list. It will satisfy all new region allocations. |
236 MasterFreeRegionList _free_list; | |
237 | |
238 // The secondary free list which contains regions that have been | |
239 // freed up during the cleanup process. This will be appended to the | |
240 // master free list when appropriate. | |
241 SecondaryFreeRegionList _secondary_free_list; | |
242 | |
4072 | 243 // It keeps track of the old regions. |
244 MasterOldRegionSet _old_set; | |
245 | |
2152 | 246 // It keeps track of the humongous regions. |
247 MasterHumongousRegionSet _humongous_set; | |
342 | 248 |
249 // The number of regions we could create by expansion. | |
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250 uint _expansion_regions; |
342 | 251 |
252 // The block offset table for the G1 heap. | |
253 G1BlockOffsetSharedArray* _bot_shared; | |
254 | |
4072 | 255 // Tears down the region sets / lists so that they are empty and the |
256 // regions on the heap do not belong to a region set / list. The | |
257 // only exception is the humongous set which we leave unaltered. If | |
258 // free_list_only is true, it will only tear down the master free | |
259 // list. It is called before a Full GC (free_list_only == false) or | |
260 // before heap shrinking (free_list_only == true). | |
261 void tear_down_region_sets(bool free_list_only); | |
262 | |
263 // Rebuilds the region sets / lists so that they are repopulated to | |
264 // reflect the contents of the heap. The only exception is the | |
265 // humongous set which was not torn down in the first place. If | |
266 // free_list_only is true, it will only rebuild the master free | |
267 // list. It is called after a Full GC (free_list_only == false) or | |
268 // after heap shrinking (free_list_only == true). | |
269 void rebuild_region_sets(bool free_list_only); | |
342 | 270 |
271 // The sequence of all heap regions in the heap. | |
3766 | 272 HeapRegionSeq _hrs; |
342 | 273 |
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274 // Alloc region used to satisfy mutator allocation requests. |
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275 MutatorAllocRegion _mutator_alloc_region; |
342 | 276 |
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277 // Alloc region used to satisfy allocation requests by the GC for |
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278 // survivor objects. |
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279 SurvivorGCAllocRegion _survivor_gc_alloc_region; |
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280 |
6595 | 281 // PLAB sizing policy for survivors. |
282 PLABStats _survivor_plab_stats; | |
283 | |
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284 // Alloc region used to satisfy allocation requests by the GC for |
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285 // old objects. |
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286 OldGCAllocRegion _old_gc_alloc_region; |
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287 |
6595 | 288 // PLAB sizing policy for tenured objects. |
289 PLABStats _old_plab_stats; | |
290 | |
291 PLABStats* stats_for_purpose(GCAllocPurpose purpose) { | |
292 PLABStats* stats = NULL; | |
293 | |
294 switch (purpose) { | |
295 case GCAllocForSurvived: | |
296 stats = &_survivor_plab_stats; | |
297 break; | |
298 case GCAllocForTenured: | |
299 stats = &_old_plab_stats; | |
300 break; | |
301 default: | |
302 assert(false, "unrecognized GCAllocPurpose"); | |
303 } | |
304 | |
305 return stats; | |
306 } | |
307 | |
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308 // The last old region we allocated to during the last GC. |
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309 // Typically, it is not full so we should re-use it during the next GC. |
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310 HeapRegion* _retained_old_gc_alloc_region; |
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311 |
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312 // It specifies whether we should attempt to expand the heap after a |
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313 // region allocation failure. If heap expansion fails we set this to |
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314 // false so that we don't re-attempt the heap expansion (it's likely |
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315 // that subsequent expansion attempts will also fail if one fails). |
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316 // Currently, it is only consulted during GC and it's reset at the |
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317 // start of each GC. |
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318 bool _expand_heap_after_alloc_failure; |
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319 |
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320 // It resets the mutator alloc region before new allocations can take place. |
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321 void init_mutator_alloc_region(); |
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322 |
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323 // It releases the mutator alloc region. |
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324 void release_mutator_alloc_region(); |
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325 |
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326 // It initializes the GC alloc regions at the start of a GC. |
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327 void init_gc_alloc_regions(); |
342 | 328 |
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329 // It releases the GC alloc regions at the end of a GC. |
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330 void release_gc_alloc_regions(); |
342 | 331 |
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332 // It does any cleanup that needs to be done on the GC alloc regions |
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333 // before a Full GC. |
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334 void abandon_gc_alloc_regions(); |
342 | 335 |
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336 // Helper for monitoring and management support. |
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337 G1MonitoringSupport* _g1mm; |
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338 |
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339 // Determines PLAB size for a particular allocation purpose. |
6595 | 340 size_t desired_plab_sz(GCAllocPurpose purpose); |
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341 |
342 | 342 // Outside of GC pauses, the number of bytes used in all regions other |
343 // than the current allocation region. | |
344 size_t _summary_bytes_used; | |
345 | |
526 | 346 // This is used for a quick test on whether a reference points into |
347 // the collection set or not. Basically, we have an array, with one | |
348 // byte per region, and that byte denotes whether the corresponding | |
349 // region is in the collection set or not. The entry corresponding | |
350 // the bottom of the heap, i.e., region 0, is pointed to by | |
351 // _in_cset_fast_test_base. The _in_cset_fast_test field has been | |
352 // biased so that it actually points to address 0 of the address | |
353 // space, to make the test as fast as possible (we can simply shift | |
354 // the address to address into it, instead of having to subtract the | |
355 // bottom of the heap from the address before shifting it; basically | |
356 // it works in the same way the card table works). | |
357 bool* _in_cset_fast_test; | |
358 | |
359 // The allocated array used for the fast test on whether a reference | |
360 // points into the collection set or not. This field is also used to | |
361 // free the array. | |
362 bool* _in_cset_fast_test_base; | |
363 | |
364 // The length of the _in_cset_fast_test_base array. | |
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365 uint _in_cset_fast_test_length; |
526 | 366 |
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367 volatile unsigned _gc_time_stamp; |
342 | 368 |
369 size_t* _surviving_young_words; | |
370 | |
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371 G1HRPrinter _hr_printer; |
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372 |
342 | 373 void setup_surviving_young_words(); |
374 void update_surviving_young_words(size_t* surv_young_words); | |
375 void cleanup_surviving_young_words(); | |
376 | |
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377 // It decides whether an explicit GC should start a concurrent cycle |
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378 // instead of doing a STW GC. Currently, a concurrent cycle is |
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379 // explicitly started if: |
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380 // (a) cause == _gc_locker and +GCLockerInvokesConcurrent, or |
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381 // (b) cause == _java_lang_system_gc and +ExplicitGCInvokesConcurrent. |
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382 // (c) cause == _g1_humongous_allocation |
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383 bool should_do_concurrent_full_gc(GCCause::Cause cause); |
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384 |
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385 // Keeps track of how many "old marking cycles" (i.e., Full GCs or |
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386 // concurrent cycles) we have started. |
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387 volatile unsigned int _old_marking_cycles_started; |
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388 |
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389 // Keeps track of how many "old marking cycles" (i.e., Full GCs or |
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390 // concurrent cycles) we have completed. |
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391 volatile unsigned int _old_marking_cycles_completed; |
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392 |
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393 // This is a non-product method that is helpful for testing. It is |
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394 // called at the end of a GC and artificially expands the heap by |
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395 // allocating a number of dead regions. This way we can induce very |
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396 // frequent marking cycles and stress the cleanup / concurrent |
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397 // cleanup code more (as all the regions that will be allocated by |
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398 // this method will be found dead by the marking cycle). |
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399 void allocate_dummy_regions() PRODUCT_RETURN; |
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400 |
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401 // Clear RSets after a compaction. It also resets the GC time stamps. |
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402 void clear_rsets_post_compaction(); |
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403 |
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404 // If the HR printer is active, dump the state of the regions in the |
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405 // heap after a compaction. |
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406 void print_hrs_post_compaction(); |
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407 |
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408 double verify(bool guard, const char* msg); |
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409 void verify_before_gc(); |
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410 void verify_after_gc(); |
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411 |
1973 | 412 // These are macros so that, if the assert fires, we get the correct |
413 // line number, file, etc. | |
414 | |
2361 | 415 #define heap_locking_asserts_err_msg(_extra_message_) \ |
2152 | 416 err_msg("%s : Heap_lock locked: %s, at safepoint: %s, is VM thread: %s", \ |
2361 | 417 (_extra_message_), \ |
2152 | 418 BOOL_TO_STR(Heap_lock->owned_by_self()), \ |
419 BOOL_TO_STR(SafepointSynchronize::is_at_safepoint()), \ | |
420 BOOL_TO_STR(Thread::current()->is_VM_thread())) | |
1973 | 421 |
422 #define assert_heap_locked() \ | |
423 do { \ | |
424 assert(Heap_lock->owned_by_self(), \ | |
425 heap_locking_asserts_err_msg("should be holding the Heap_lock")); \ | |
426 } while (0) | |
427 | |
2361 | 428 #define assert_heap_locked_or_at_safepoint(_should_be_vm_thread_) \ |
1973 | 429 do { \ |
430 assert(Heap_lock->owned_by_self() || \ | |
2152 | 431 (SafepointSynchronize::is_at_safepoint() && \ |
2361 | 432 ((_should_be_vm_thread_) == Thread::current()->is_VM_thread())), \ |
1973 | 433 heap_locking_asserts_err_msg("should be holding the Heap_lock or " \ |
434 "should be at a safepoint")); \ | |
435 } while (0) | |
436 | |
437 #define assert_heap_locked_and_not_at_safepoint() \ | |
438 do { \ | |
439 assert(Heap_lock->owned_by_self() && \ | |
440 !SafepointSynchronize::is_at_safepoint(), \ | |
441 heap_locking_asserts_err_msg("should be holding the Heap_lock and " \ | |
442 "should not be at a safepoint")); \ | |
443 } while (0) | |
444 | |
445 #define assert_heap_not_locked() \ | |
446 do { \ | |
447 assert(!Heap_lock->owned_by_self(), \ | |
448 heap_locking_asserts_err_msg("should not be holding the Heap_lock")); \ | |
449 } while (0) | |
450 | |
451 #define assert_heap_not_locked_and_not_at_safepoint() \ | |
452 do { \ | |
453 assert(!Heap_lock->owned_by_self() && \ | |
454 !SafepointSynchronize::is_at_safepoint(), \ | |
455 heap_locking_asserts_err_msg("should not be holding the Heap_lock and " \ | |
456 "should not be at a safepoint")); \ | |
457 } while (0) | |
458 | |
2361 | 459 #define assert_at_safepoint(_should_be_vm_thread_) \ |
1973 | 460 do { \ |
2152 | 461 assert(SafepointSynchronize::is_at_safepoint() && \ |
2361 | 462 ((_should_be_vm_thread_) == Thread::current()->is_VM_thread()), \ |
1973 | 463 heap_locking_asserts_err_msg("should be at a safepoint")); \ |
464 } while (0) | |
465 | |
466 #define assert_not_at_safepoint() \ | |
467 do { \ | |
468 assert(!SafepointSynchronize::is_at_safepoint(), \ | |
469 heap_locking_asserts_err_msg("should not be at a safepoint")); \ | |
470 } while (0) | |
471 | |
342 | 472 protected: |
473 | |
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474 // The young region list. |
342 | 475 YoungList* _young_list; |
476 | |
477 // The current policy object for the collector. | |
478 G1CollectorPolicy* _g1_policy; | |
479 | |
2152 | 480 // This is the second level of trying to allocate a new region. If |
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481 // new_region() didn't find a region on the free_list, this call will |
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482 // check whether there's anything available on the |
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483 // secondary_free_list and/or wait for more regions to appear on |
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484 // that list, if _free_regions_coming is set. |
2361 | 485 HeapRegion* new_region_try_secondary_free_list(); |
342 | 486 |
2361 | 487 // Try to allocate a single non-humongous HeapRegion sufficient for |
488 // an allocation of the given word_size. If do_expand is true, | |
489 // attempt to expand the heap if necessary to satisfy the allocation | |
490 // request. | |
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491 HeapRegion* new_region(size_t word_size, bool do_expand); |
342 | 492 |
2361 | 493 // Attempt to satisfy a humongous allocation request of the given |
494 // size by finding a contiguous set of free regions of num_regions | |
495 // length and remove them from the master free list. Return the | |
3766 | 496 // index of the first region or G1_NULL_HRS_INDEX if the search |
497 // was unsuccessful. | |
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498 uint humongous_obj_allocate_find_first(uint num_regions, |
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499 size_t word_size); |
342 | 500 |
2361 | 501 // Initialize a contiguous set of free regions of length num_regions |
502 // and starting at index first so that they appear as a single | |
503 // humongous region. | |
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504 HeapWord* humongous_obj_allocate_initialize_regions(uint first, |
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505 uint num_regions, |
2361 | 506 size_t word_size); |
507 | |
508 // Attempt to allocate a humongous object of the given size. Return | |
509 // NULL if unsuccessful. | |
2152 | 510 HeapWord* humongous_obj_allocate(size_t word_size); |
1973 | 511 |
512 // The following two methods, allocate_new_tlab() and | |
513 // mem_allocate(), are the two main entry points from the runtime | |
514 // into the G1's allocation routines. They have the following | |
515 // assumptions: | |
516 // | |
517 // * They should both be called outside safepoints. | |
518 // | |
519 // * They should both be called without holding the Heap_lock. | |
520 // | |
521 // * All allocation requests for new TLABs should go to | |
522 // allocate_new_tlab(). | |
523 // | |
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524 // * All non-TLAB allocation requests should go to mem_allocate(). |
1973 | 525 // |
526 // * If either call cannot satisfy the allocation request using the | |
527 // current allocating region, they will try to get a new one. If | |
528 // this fails, they will attempt to do an evacuation pause and | |
529 // retry the allocation. | |
530 // | |
531 // * If all allocation attempts fail, even after trying to schedule | |
532 // an evacuation pause, allocate_new_tlab() will return NULL, | |
533 // whereas mem_allocate() will attempt a heap expansion and/or | |
534 // schedule a Full GC. | |
535 // | |
536 // * We do not allow humongous-sized TLABs. So, allocate_new_tlab | |
537 // should never be called with word_size being humongous. All | |
538 // humongous allocation requests should go to mem_allocate() which | |
539 // will satisfy them with a special path. | |
540 | |
541 virtual HeapWord* allocate_new_tlab(size_t word_size); | |
542 | |
543 virtual HeapWord* mem_allocate(size_t word_size, | |
544 bool* gc_overhead_limit_was_exceeded); | |
342 | 545 |
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546 // The following three methods take a gc_count_before_ret |
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547 // parameter which is used to return the GC count if the method |
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548 // returns NULL. Given that we are required to read the GC count |
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549 // while holding the Heap_lock, and these paths will take the |
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550 // Heap_lock at some point, it's easier to get them to read the GC |
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551 // count while holding the Heap_lock before they return NULL instead |
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552 // of the caller (namely: mem_allocate()) having to also take the |
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553 // Heap_lock just to read the GC count. |
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554 |
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555 // First-level mutator allocation attempt: try to allocate out of |
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556 // the mutator alloc region without taking the Heap_lock. This |
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557 // should only be used for non-humongous allocations. |
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558 inline HeapWord* attempt_allocation(size_t word_size, |
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559 unsigned int* gc_count_before_ret); |
342 | 560 |
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561 // Second-level mutator allocation attempt: take the Heap_lock and |
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562 // retry the allocation attempt, potentially scheduling a GC |
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563 // pause. This should only be used for non-humongous allocations. |
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564 HeapWord* attempt_allocation_slow(size_t word_size, |
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565 unsigned int* gc_count_before_ret); |
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566 |
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567 // Takes the Heap_lock and attempts a humongous allocation. It can |
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568 // potentially schedule a GC pause. |
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569 HeapWord* attempt_allocation_humongous(size_t word_size, |
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570 unsigned int* gc_count_before_ret); |
1973 | 571 |
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572 // Allocation attempt that should be called during safepoints (e.g., |
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573 // at the end of a successful GC). expect_null_mutator_alloc_region |
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574 // specifies whether the mutator alloc region is expected to be NULL |
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575 // or not. |
1973 | 576 HeapWord* attempt_allocation_at_safepoint(size_t word_size, |
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577 bool expect_null_mutator_alloc_region); |
1973 | 578 |
579 // It dirties the cards that cover the block so that so that the post | |
580 // write barrier never queues anything when updating objects on this | |
581 // block. It is assumed (and in fact we assert) that the block | |
582 // belongs to a young region. | |
583 inline void dirty_young_block(HeapWord* start, size_t word_size); | |
342 | 584 |
585 // Allocate blocks during garbage collection. Will ensure an | |
586 // allocation region, either by picking one or expanding the | |
587 // heap, and then allocate a block of the given size. The block | |
588 // may not be a humongous - it must fit into a single heap region. | |
589 HeapWord* par_allocate_during_gc(GCAllocPurpose purpose, size_t word_size); | |
590 | |
591 HeapWord* allocate_during_gc_slow(GCAllocPurpose purpose, | |
592 HeapRegion* alloc_region, | |
593 bool par, | |
594 size_t word_size); | |
595 | |
596 // Ensure that no further allocations can happen in "r", bearing in mind | |
597 // that parallel threads might be attempting allocations. | |
598 void par_allocate_remaining_space(HeapRegion* r); | |
599 | |
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600 // Allocation attempt during GC for a survivor object / PLAB. |
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601 inline HeapWord* survivor_attempt_allocation(size_t word_size); |
545 | 602 |
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603 // Allocation attempt during GC for an old object / PLAB. |
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604 inline HeapWord* old_attempt_allocation(size_t word_size); |
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605 |
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606 // These methods are the "callbacks" from the G1AllocRegion class. |
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607 |
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608 // For mutator alloc regions. |
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609 HeapRegion* new_mutator_alloc_region(size_t word_size, bool force); |
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610 void retire_mutator_alloc_region(HeapRegion* alloc_region, |
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611 size_t allocated_bytes); |
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612 |
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613 // For GC alloc regions. |
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614 HeapRegion* new_gc_alloc_region(size_t word_size, uint count, |
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615 GCAllocPurpose ap); |
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616 void retire_gc_alloc_region(HeapRegion* alloc_region, |
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617 size_t allocated_bytes, GCAllocPurpose ap); |
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618 |
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619 // - if explicit_gc is true, the GC is for a System.gc() or a heap |
1973 | 620 // inspection request and should collect the entire heap |
621 // - if clear_all_soft_refs is true, all soft references should be | |
622 // cleared during the GC | |
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623 // - if explicit_gc is false, word_size describes the allocation that |
1973 | 624 // the GC should attempt (at least) to satisfy |
625 // - it returns false if it is unable to do the collection due to the | |
626 // GC locker being active, true otherwise | |
627 bool do_collection(bool explicit_gc, | |
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628 bool clear_all_soft_refs, |
342 | 629 size_t word_size); |
630 | |
631 // Callback from VM_G1CollectFull operation. | |
632 // Perform a full collection. | |
633 void do_full_collection(bool clear_all_soft_refs); | |
634 | |
635 // Resize the heap if necessary after a full collection. If this is | |
636 // after a collect-for allocation, "word_size" is the allocation size, | |
637 // and will be considered part of the used portion of the heap. | |
638 void resize_if_necessary_after_full_collection(size_t word_size); | |
639 | |
640 // Callback from VM_G1CollectForAllocation operation. | |
641 // This function does everything necessary/possible to satisfy a | |
642 // failed allocation request (including collection, expansion, etc.) | |
1973 | 643 HeapWord* satisfy_failed_allocation(size_t word_size, bool* succeeded); |
342 | 644 |
645 // Attempting to expand the heap sufficiently | |
646 // to support an allocation of the given "word_size". If | |
647 // successful, perform the allocation and return the address of the | |
648 // allocated block, or else "NULL". | |
1973 | 649 HeapWord* expand_and_allocate(size_t word_size); |
342 | 650 |
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651 // Process any reference objects discovered during |
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652 // an incremental evacuation pause. |
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653 void process_discovered_references(); |
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654 |
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655 // Enqueue any remaining discovered references |
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656 // after processing. |
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657 void enqueue_discovered_references(); |
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658 |
342 | 659 public: |
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660 |
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661 G1MonitoringSupport* g1mm() { |
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662 assert(_g1mm != NULL, "should have been initialized"); |
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663 return _g1mm; |
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664 } |
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665 |
342 | 666 // Expand the garbage-first heap by at least the given size (in bytes!). |
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667 // Returns true if the heap was expanded by the requested amount; |
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668 // false otherwise. |
342 | 669 // (Rounds up to a HeapRegion boundary.) |
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670 bool expand(size_t expand_bytes); |
342 | 671 |
672 // Do anything common to GC's. | |
673 virtual void gc_prologue(bool full); | |
674 virtual void gc_epilogue(bool full); | |
675 | |
526 | 676 // We register a region with the fast "in collection set" test. We |
677 // simply set to true the array slot corresponding to this region. | |
678 void register_region_with_in_cset_fast_test(HeapRegion* r) { | |
679 assert(_in_cset_fast_test_base != NULL, "sanity"); | |
680 assert(r->in_collection_set(), "invariant"); | |
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681 uint index = r->hrs_index(); |
3766 | 682 assert(index < _in_cset_fast_test_length, "invariant"); |
526 | 683 assert(!_in_cset_fast_test_base[index], "invariant"); |
684 _in_cset_fast_test_base[index] = true; | |
685 } | |
686 | |
687 // This is a fast test on whether a reference points into the | |
688 // collection set or not. It does not assume that the reference | |
689 // points into the heap; if it doesn't, it will return false. | |
690 bool in_cset_fast_test(oop obj) { | |
691 assert(_in_cset_fast_test != NULL, "sanity"); | |
692 if (_g1_committed.contains((HeapWord*) obj)) { | |
693 // no need to subtract the bottom of the heap from obj, | |
694 // _in_cset_fast_test is biased | |
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695 uintx index = (uintx) obj >> HeapRegion::LogOfHRGrainBytes; |
526 | 696 bool ret = _in_cset_fast_test[index]; |
697 // let's make sure the result is consistent with what the slower | |
698 // test returns | |
699 assert( ret || !obj_in_cs(obj), "sanity"); | |
700 assert(!ret || obj_in_cs(obj), "sanity"); | |
701 return ret; | |
702 } else { | |
703 return false; | |
704 } | |
705 } | |
706 | |
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707 void clear_cset_fast_test() { |
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708 assert(_in_cset_fast_test_base != NULL, "sanity"); |
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709 memset(_in_cset_fast_test_base, false, |
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710 (size_t) _in_cset_fast_test_length * sizeof(bool)); |
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711 } |
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712 |
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713 // This is called at the start of either a concurrent cycle or a Full |
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714 // GC to update the number of old marking cycles started. |
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715 void increment_old_marking_cycles_started(); |
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716 |
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717 // This is called at the end of either a concurrent cycle or a Full |
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718 // GC to update the number of old marking cycles completed. Those two |
1656
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719 // can happen in a nested fashion, i.e., we start a concurrent |
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720 // cycle, a Full GC happens half-way through it which ends first, |
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721 // and then the cycle notices that a Full GC happened and ends |
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722 // too. The concurrent parameter is a boolean to help us do a bit |
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723 // tighter consistency checking in the method. If concurrent is |
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724 // false, the caller is the inner caller in the nesting (i.e., the |
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725 // Full GC). If concurrent is true, the caller is the outer caller |
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726 // in this nesting (i.e., the concurrent cycle). Further nesting is |
6120
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727 // not currently supported. The end of this call also notifies |
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728 // the FullGCCount_lock in case a Java thread is waiting for a full |
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729 // GC to happen (e.g., it called System.gc() with |
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730 // +ExplicitGCInvokesConcurrent). |
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731 void increment_old_marking_cycles_completed(bool concurrent); |
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732 |
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733 unsigned int old_marking_cycles_completed() { |
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734 return _old_marking_cycles_completed; |
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735 } |
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736 |
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737 G1HRPrinter* hr_printer() { return &_hr_printer; } |
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738 |
342 | 739 protected: |
740 | |
741 // Shrink the garbage-first heap by at most the given size (in bytes!). | |
742 // (Rounds down to a HeapRegion boundary.) | |
743 virtual void shrink(size_t expand_bytes); | |
744 void shrink_helper(size_t expand_bytes); | |
745 | |
1709 | 746 #if TASKQUEUE_STATS |
747 static void print_taskqueue_stats_hdr(outputStream* const st = gclog_or_tty); | |
748 void print_taskqueue_stats(outputStream* const st = gclog_or_tty) const; | |
749 void reset_taskqueue_stats(); | |
750 #endif // TASKQUEUE_STATS | |
751 | |
1973 | 752 // Schedule the VM operation that will do an evacuation pause to |
753 // satisfy an allocation request of word_size. *succeeded will | |
754 // return whether the VM operation was successful (it did do an | |
755 // evacuation pause) or not (another thread beat us to it or the GC | |
756 // locker was active). Given that we should not be holding the | |
757 // Heap_lock when we enter this method, we will pass the | |
758 // gc_count_before (i.e., total_collections()) as a parameter since | |
759 // it has to be read while holding the Heap_lock. Currently, both | |
760 // methods that call do_collection_pause() release the Heap_lock | |
761 // before the call, so it's easy to read gc_count_before just before. | |
762 HeapWord* do_collection_pause(size_t word_size, | |
763 unsigned int gc_count_before, | |
764 bool* succeeded); | |
342 | 765 |
766 // The guts of the incremental collection pause, executed by the vm | |
1973 | 767 // thread. It returns false if it is unable to do the collection due |
768 // to the GC locker being active, true otherwise | |
769 bool do_collection_pause_at_safepoint(double target_pause_time_ms); | |
342 | 770 |
771 // Actually do the work of evacuating the collection set. | |
1973 | 772 void evacuate_collection_set(); |
342 | 773 |
774 // The g1 remembered set of the heap. | |
775 G1RemSet* _g1_rem_set; | |
776 // And it's mod ref barrier set, used to track updates for the above. | |
777 ModRefBarrierSet* _mr_bs; | |
778 | |
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779 // A set of cards that cover the objects for which the Rsets should be updated |
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780 // concurrently after the collection. |
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781 DirtyCardQueueSet _dirty_card_queue_set; |
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782 |
342 | 783 // The Heap Region Rem Set Iterator. |
784 HeapRegionRemSetIterator** _rem_set_iterator; | |
785 | |
786 // The closure used to refine a single card. | |
787 RefineCardTableEntryClosure* _refine_cte_cl; | |
788 | |
789 // A function to check the consistency of dirty card logs. | |
790 void check_ct_logs_at_safepoint(); | |
791 | |
1705 | 792 // A DirtyCardQueueSet that is used to hold cards that contain |
793 // references into the current collection set. This is used to | |
794 // update the remembered sets of the regions in the collection | |
795 // set in the event of an evacuation failure. | |
796 DirtyCardQueueSet _into_cset_dirty_card_queue_set; | |
797 | |
342 | 798 // After a collection pause, make the regions in the CS into free |
799 // regions. | |
800 void free_collection_set(HeapRegion* cs_head); | |
801 | |
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802 // Abandon the current collection set without recording policy |
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803 // statistics or updating free lists. |
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804 void abandon_collection_set(HeapRegion* cs_head); |
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805 |
342 | 806 // Applies "scan_non_heap_roots" to roots outside the heap, |
807 // "scan_rs" to roots inside the heap (having done "set_region" to | |
808 // indicate the region in which the root resides), and does "scan_perm" | |
809 // (setting the generation to the perm generation.) If "scan_rs" is | |
810 // NULL, then this step is skipped. The "worker_i" | |
811 // param is for use with parallel roots processing, and should be | |
812 // the "i" of the calling parallel worker thread's work(i) function. | |
813 // In the sequential case this param will be ignored. | |
814 void g1_process_strong_roots(bool collecting_perm_gen, | |
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815 ScanningOption so, |
342 | 816 OopClosure* scan_non_heap_roots, |
817 OopsInHeapRegionClosure* scan_rs, | |
818 OopsInGenClosure* scan_perm, | |
819 int worker_i); | |
820 | |
821 // Apply "blk" to all the weak roots of the system. These include | |
822 // JNI weak roots, the code cache, system dictionary, symbol table, | |
823 // string table, and referents of reachable weak refs. | |
824 void g1_process_weak_roots(OopClosure* root_closure, | |
825 OopClosure* non_root_closure); | |
826 | |
2361 | 827 // Frees a non-humongous region by initializing its contents and |
2152 | 828 // adding it to the free list that's passed as a parameter (this is |
829 // usually a local list which will be appended to the master free | |
830 // list later). The used bytes of freed regions are accumulated in | |
831 // pre_used. If par is true, the region's RSet will not be freed | |
832 // up. The assumption is that this will be done later. | |
833 void free_region(HeapRegion* hr, | |
834 size_t* pre_used, | |
835 FreeRegionList* free_list, | |
836 bool par); | |
342 | 837 |
2361 | 838 // Frees a humongous region by collapsing it into individual regions |
839 // and calling free_region() for each of them. The freed regions | |
840 // will be added to the free list that's passed as a parameter (this | |
841 // is usually a local list which will be appended to the master free | |
842 // list later). The used bytes of freed regions are accumulated in | |
843 // pre_used. If par is true, the region's RSet will not be freed | |
844 // up. The assumption is that this will be done later. | |
2152 | 845 void free_humongous_region(HeapRegion* hr, |
846 size_t* pre_used, | |
847 FreeRegionList* free_list, | |
848 HumongousRegionSet* humongous_proxy_set, | |
849 bool par); | |
342 | 850 |
3766 | 851 // Notifies all the necessary spaces that the committed space has |
852 // been updated (either expanded or shrunk). It should be called | |
853 // after _g1_storage is updated. | |
854 void update_committed_space(HeapWord* old_end, HeapWord* new_end); | |
855 | |
342 | 856 // The concurrent marker (and the thread it runs in.) |
857 ConcurrentMark* _cm; | |
858 ConcurrentMarkThread* _cmThread; | |
859 bool _mark_in_progress; | |
860 | |
861 // The concurrent refiner. | |
862 ConcurrentG1Refine* _cg1r; | |
863 | |
864 // The parallel task queues | |
865 RefToScanQueueSet *_task_queues; | |
866 | |
867 // True iff a evacuation has failed in the current collection. | |
868 bool _evacuation_failed; | |
869 | |
870 // Set the attribute indicating whether evacuation has failed in the | |
871 // current collection. | |
872 void set_evacuation_failed(bool b) { _evacuation_failed = b; } | |
873 | |
874 // Failed evacuations cause some logical from-space objects to have | |
875 // forwarding pointers to themselves. Reset them. | |
876 void remove_self_forwarding_pointers(); | |
877 | |
878 // When one is non-null, so is the other. Together, they each pair is | |
879 // an object with a preserved mark, and its mark value. | |
880 GrowableArray<oop>* _objs_with_preserved_marks; | |
881 GrowableArray<markOop>* _preserved_marks_of_objs; | |
882 | |
883 // Preserve the mark of "obj", if necessary, in preparation for its mark | |
884 // word being overwritten with a self-forwarding-pointer. | |
885 void preserve_mark_if_necessary(oop obj, markOop m); | |
886 | |
887 // The stack of evac-failure objects left to be scanned. | |
888 GrowableArray<oop>* _evac_failure_scan_stack; | |
889 // The closure to apply to evac-failure objects. | |
890 | |
891 OopsInHeapRegionClosure* _evac_failure_closure; | |
892 // Set the field above. | |
893 void | |
894 set_evac_failure_closure(OopsInHeapRegionClosure* evac_failure_closure) { | |
895 _evac_failure_closure = evac_failure_closure; | |
896 } | |
897 | |
898 // Push "obj" on the scan stack. | |
899 void push_on_evac_failure_scan_stack(oop obj); | |
900 // Process scan stack entries until the stack is empty. | |
901 void drain_evac_failure_scan_stack(); | |
902 // True iff an invocation of "drain_scan_stack" is in progress; to | |
903 // prevent unnecessary recursion. | |
904 bool _drain_in_progress; | |
905 | |
906 // Do any necessary initialization for evacuation-failure handling. | |
907 // "cl" is the closure that will be used to process evac-failure | |
908 // objects. | |
909 void init_for_evac_failure(OopsInHeapRegionClosure* cl); | |
910 // Do any necessary cleanup for evacuation-failure handling data | |
911 // structures. | |
912 void finalize_for_evac_failure(); | |
913 | |
914 // An attempt to evacuate "obj" has failed; take necessary steps. | |
4787
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915 oop handle_evacuation_failure_par(OopsInHeapRegionClosure* cl, oop obj); |
342 | 916 void handle_evacuation_failure_common(oop obj, markOop m); |
917 | |
3979
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918 // ("Weak") Reference processing support. |
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919 // |
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920 // G1 has 2 instances of the referece processor class. One |
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921 // (_ref_processor_cm) handles reference object discovery |
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922 // and subsequent processing during concurrent marking cycles. |
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923 // |
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924 // The other (_ref_processor_stw) handles reference object |
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925 // discovery and processing during full GCs and incremental |
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926 // evacuation pauses. |
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927 // |
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928 // During an incremental pause, reference discovery will be |
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929 // temporarily disabled for _ref_processor_cm and will be |
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930 // enabled for _ref_processor_stw. At the end of the evacuation |
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931 // pause references discovered by _ref_processor_stw will be |
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932 // processed and discovery will be disabled. The previous |
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933 // setting for reference object discovery for _ref_processor_cm |
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934 // will be re-instated. |
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935 // |
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936 // At the start of marking: |
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937 // * Discovery by the CM ref processor is verified to be inactive |
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938 // and it's discovered lists are empty. |
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939 // * Discovery by the CM ref processor is then enabled. |
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940 // |
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941 // At the end of marking: |
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942 // * Any references on the CM ref processor's discovered |
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943 // lists are processed (possibly MT). |
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944 // |
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945 // At the start of full GC we: |
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946 // * Disable discovery by the CM ref processor and |
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947 // empty CM ref processor's discovered lists |
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948 // (without processing any entries). |
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949 // * Verify that the STW ref processor is inactive and it's |
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950 // discovered lists are empty. |
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951 // * Temporarily set STW ref processor discovery as single threaded. |
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952 // * Temporarily clear the STW ref processor's _is_alive_non_header |
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953 // field. |
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954 // * Finally enable discovery by the STW ref processor. |
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955 // |
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956 // The STW ref processor is used to record any discovered |
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957 // references during the full GC. |
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958 // |
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959 // At the end of a full GC we: |
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960 // * Enqueue any reference objects discovered by the STW ref processor |
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961 // that have non-live referents. This has the side-effect of |
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962 // making the STW ref processor inactive by disabling discovery. |
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963 // * Verify that the CM ref processor is still inactive |
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964 // and no references have been placed on it's discovered |
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965 // lists (also checked as a precondition during initial marking). |
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966 |
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967 // The (stw) reference processor... |
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968 ReferenceProcessor* _ref_processor_stw; |
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969 |
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970 // During reference object discovery, the _is_alive_non_header |
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971 // closure (if non-null) is applied to the referent object to |
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972 // determine whether the referent is live. If so then the |
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973 // reference object does not need to be 'discovered' and can |
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974 // be treated as a regular oop. This has the benefit of reducing |
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975 // the number of 'discovered' reference objects that need to |
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976 // be processed. |
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977 // |
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978 // Instance of the is_alive closure for embedding into the |
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979 // STW reference processor as the _is_alive_non_header field. |
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980 // Supplying a value for the _is_alive_non_header field is |
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981 // optional but doing so prevents unnecessary additions to |
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982 // the discovered lists during reference discovery. |
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983 G1STWIsAliveClosure _is_alive_closure_stw; |
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984 |
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985 // The (concurrent marking) reference processor... |
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986 ReferenceProcessor* _ref_processor_cm; |
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987 |
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988 // Instance of the concurrent mark is_alive closure for embedding |
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989 // into the Concurrent Marking reference processor as the |
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990 // _is_alive_non_header field. Supplying a value for the |
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991 // _is_alive_non_header field is optional but doing so prevents |
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992 // unnecessary additions to the discovered lists during reference |
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993 // discovery. |
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994 G1CMIsAliveClosure _is_alive_closure_cm; |
342 | 995 |
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996 // Cache used by G1CollectedHeap::start_cset_region_for_worker(). |
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997 HeapRegion** _worker_cset_start_region; |
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998 |
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999 // Time stamp to validate the regions recorded in the cache |
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1000 // used by G1CollectedHeap::start_cset_region_for_worker(). |
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1001 // The heap region entry for a given worker is valid iff |
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1002 // the associated time stamp value matches the current value |
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1003 // of G1CollectedHeap::_gc_time_stamp. |
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1004 unsigned int* _worker_cset_start_region_time_stamp; |
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1005 |
342 | 1006 enum G1H_process_strong_roots_tasks { |
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1007 G1H_PS_filter_satb_buffers, |
342 | 1008 G1H_PS_refProcessor_oops_do, |
1009 // Leave this one last. | |
1010 G1H_PS_NumElements | |
1011 }; | |
1012 | |
1013 SubTasksDone* _process_strong_tasks; | |
1014 | |
2152 | 1015 volatile bool _free_regions_coming; |
342 | 1016 |
1017 public: | |
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1018 |
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1019 SubTasksDone* process_strong_tasks() { return _process_strong_tasks; } |
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1020 |
342 | 1021 void set_refine_cte_cl_concurrency(bool concurrent); |
1022 | |
1709 | 1023 RefToScanQueue *task_queue(int i) const; |
342 | 1024 |
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1025 // A set of cards where updates happened during the GC |
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1026 DirtyCardQueueSet& dirty_card_queue_set() { return _dirty_card_queue_set; } |
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1027 |
1705 | 1028 // A DirtyCardQueueSet that is used to hold cards that contain |
1029 // references into the current collection set. This is used to | |
1030 // update the remembered sets of the regions in the collection | |
1031 // set in the event of an evacuation failure. | |
1032 DirtyCardQueueSet& into_cset_dirty_card_queue_set() | |
1033 { return _into_cset_dirty_card_queue_set; } | |
1034 | |
342 | 1035 // Create a G1CollectedHeap with the specified policy. |
1036 // Must call the initialize method afterwards. | |
1037 // May not return if something goes wrong. | |
1038 G1CollectedHeap(G1CollectorPolicy* policy); | |
1039 | |
1040 // Initialize the G1CollectedHeap to have the initial and | |
1041 // maximum sizes, permanent generation, and remembered and barrier sets | |
1042 // specified by the policy object. | |
1043 jint initialize(); | |
1044 | |
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1045 // Initialize weak reference processing. |
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1046 virtual void ref_processing_init(); |
342 | 1047 |
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1048 void set_par_threads(uint t) { |
342 | 1049 SharedHeap::set_par_threads(t); |
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1050 // Done in SharedHeap but oddly there are |
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1051 // two _process_strong_tasks's in a G1CollectedHeap |
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1052 // so do it here too. |
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1053 _process_strong_tasks->set_n_threads(t); |
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1054 } |
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1055 |
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1056 // Set _n_par_threads according to a policy TBD. |
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1057 void set_par_threads(); |
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1058 |
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1059 void set_n_termination(int t) { |
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1060 _process_strong_tasks->set_n_threads(t); |
342 | 1061 } |
1062 | |
1063 virtual CollectedHeap::Name kind() const { | |
1064 return CollectedHeap::G1CollectedHeap; | |
1065 } | |
1066 | |
1067 // The current policy object for the collector. | |
1068 G1CollectorPolicy* g1_policy() const { return _g1_policy; } | |
1069 | |
1070 // Adaptive size policy. No such thing for g1. | |
1071 virtual AdaptiveSizePolicy* size_policy() { return NULL; } | |
1072 | |
1073 // The rem set and barrier set. | |
1074 G1RemSet* g1_rem_set() const { return _g1_rem_set; } | |
1075 ModRefBarrierSet* mr_bs() const { return _mr_bs; } | |
1076 | |
1077 // The rem set iterator. | |
1078 HeapRegionRemSetIterator* rem_set_iterator(int i) { | |
1079 return _rem_set_iterator[i]; | |
1080 } | |
1081 | |
1082 HeapRegionRemSetIterator* rem_set_iterator() { | |
1083 return _rem_set_iterator[0]; | |
1084 } | |
1085 | |
1086 unsigned get_gc_time_stamp() { | |
1087 return _gc_time_stamp; | |
1088 } | |
1089 | |
1090 void reset_gc_time_stamp() { | |
1091 _gc_time_stamp = 0; | |
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1092 OrderAccess::fence(); |
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1093 // Clear the cached CSet starting regions and time stamps. |
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1094 // Their validity is dependent on the GC timestamp. |
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1095 clear_cset_start_regions(); |
353
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1096 } |
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1097 |
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1098 void check_gc_time_stamps() PRODUCT_RETURN; |
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1099 |
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1100 void increment_gc_time_stamp() { |
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1101 ++_gc_time_stamp; |
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1102 OrderAccess::fence(); |
342 | 1103 } |
1104 | |
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1105 // Reset the given region's GC timestamp. If it's starts humongous, |
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1106 // also reset the GC timestamp of its corresponding |
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1107 // continues humongous regions too. |
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1108 void reset_gc_time_stamps(HeapRegion* hr); |
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1109 |
1705 | 1110 void iterate_dirty_card_closure(CardTableEntryClosure* cl, |
1111 DirtyCardQueue* into_cset_dcq, | |
1112 bool concurrent, int worker_i); | |
342 | 1113 |
1114 // The shared block offset table array. | |
1115 G1BlockOffsetSharedArray* bot_shared() const { return _bot_shared; } | |
1116 | |
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1117 // Reference Processing accessors |
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1118 |
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1119 // The STW reference processor.... |
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1120 ReferenceProcessor* ref_processor_stw() const { return _ref_processor_stw; } |
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1121 |
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1122 // The Concurent Marking reference processor... |
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1123 ReferenceProcessor* ref_processor_cm() const { return _ref_processor_cm; } |
342 | 1124 |
1125 virtual size_t capacity() const; | |
1126 virtual size_t used() const; | |
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1127 // This should be called when we're not holding the heap lock. The |
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1128 // result might be a bit inaccurate. |
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1129 size_t used_unlocked() const; |
342 | 1130 size_t recalculate_used() const; |
1131 | |
1132 // These virtual functions do the actual allocation. | |
1133 // Some heaps may offer a contiguous region for shared non-blocking | |
1134 // allocation, via inlined code (by exporting the address of the top and | |
1135 // end fields defining the extent of the contiguous allocation region.) | |
1136 // But G1CollectedHeap doesn't yet support this. | |
1137 | |
1138 // Return an estimate of the maximum allocation that could be performed | |
1139 // without triggering any collection or expansion activity. In a | |
1140 // generational collector, for example, this is probably the largest | |
1141 // allocation that could be supported (without expansion) in the youngest | |
1142 // generation. It is "unsafe" because no locks are taken; the result | |
1143 // should be treated as an approximation, not a guarantee, for use in | |
1144 // heuristic resizing decisions. | |
1145 virtual size_t unsafe_max_alloc(); | |
1146 | |
1147 virtual bool is_maximal_no_gc() const { | |
1148 return _g1_storage.uncommitted_size() == 0; | |
1149 } | |
1150 | |
1151 // The total number of regions in the heap. | |
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1152 uint n_regions() { return _hrs.length(); } |
3766 | 1153 |
1154 // The max number of regions in the heap. | |
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1155 uint max_regions() { return _hrs.max_length(); } |
342 | 1156 |
1157 // The number of regions that are completely free. | |
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1158 uint free_regions() { return _free_list.length(); } |
342 | 1159 |
1160 // The number of regions that are not completely free. | |
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1161 uint used_regions() { return n_regions() - free_regions(); } |
342 | 1162 |
1163 // The number of regions available for "regular" expansion. | |
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1164 uint expansion_regions() { return _expansion_regions; } |
342 | 1165 |
3766 | 1166 // Factory method for HeapRegion instances. It will return NULL if |
1167 // the allocation fails. | |
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1168 HeapRegion* new_heap_region(uint hrs_index, HeapWord* bottom); |
3766 | 1169 |
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1170 void verify_not_dirty_region(HeapRegion* hr) PRODUCT_RETURN; |
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1171 void verify_dirty_region(HeapRegion* hr) PRODUCT_RETURN; |
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1172 void verify_dirty_young_list(HeapRegion* head) PRODUCT_RETURN; |
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1173 void verify_dirty_young_regions() PRODUCT_RETURN; |
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1174 |
2152 | 1175 // verify_region_sets() performs verification over the region |
1176 // lists. It will be compiled in the product code to be used when | |
1177 // necessary (i.e., during heap verification). | |
1178 void verify_region_sets(); | |
342 | 1179 |
2152 | 1180 // verify_region_sets_optional() is planted in the code for |
1181 // list verification in non-product builds (and it can be enabled in | |
1182 // product builds by definning HEAP_REGION_SET_FORCE_VERIFY to be 1). | |
1183 #if HEAP_REGION_SET_FORCE_VERIFY | |
1184 void verify_region_sets_optional() { | |
1185 verify_region_sets(); | |
1186 } | |
1187 #else // HEAP_REGION_SET_FORCE_VERIFY | |
1188 void verify_region_sets_optional() { } | |
1189 #endif // HEAP_REGION_SET_FORCE_VERIFY | |
342 | 1190 |
2152 | 1191 #ifdef ASSERT |
2361 | 1192 bool is_on_master_free_list(HeapRegion* hr) { |
2152 | 1193 return hr->containing_set() == &_free_list; |
1194 } | |
342 | 1195 |
2361 | 1196 bool is_in_humongous_set(HeapRegion* hr) { |
2152 | 1197 return hr->containing_set() == &_humongous_set; |
2361 | 1198 } |
2152 | 1199 #endif // ASSERT |
342 | 1200 |
2152 | 1201 // Wrapper for the region list operations that can be called from |
1202 // methods outside this class. | |
342 | 1203 |
2152 | 1204 void secondary_free_list_add_as_tail(FreeRegionList* list) { |
1205 _secondary_free_list.add_as_tail(list); | |
1206 } | |
342 | 1207 |
2152 | 1208 void append_secondary_free_list() { |
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1209 _free_list.add_as_head(&_secondary_free_list); |
2152 | 1210 } |
342 | 1211 |
2361 | 1212 void append_secondary_free_list_if_not_empty_with_lock() { |
1213 // If the secondary free list looks empty there's no reason to | |
1214 // take the lock and then try to append it. | |
2152 | 1215 if (!_secondary_free_list.is_empty()) { |
1216 MutexLockerEx x(SecondaryFreeList_lock, Mutex::_no_safepoint_check_flag); | |
1217 append_secondary_free_list(); | |
1218 } | |
1219 } | |
342 | 1220 |
4072 | 1221 void old_set_remove(HeapRegion* hr) { |
1222 _old_set.remove(hr); | |
1223 } | |
1224 | |
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1225 size_t non_young_capacity_bytes() { |
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1226 return _old_set.total_capacity_bytes() + _humongous_set.total_capacity_bytes(); |
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1227 } |
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1228 |
2152 | 1229 void set_free_regions_coming(); |
1230 void reset_free_regions_coming(); | |
1231 bool free_regions_coming() { return _free_regions_coming; } | |
1232 void wait_while_free_regions_coming(); | |
342 | 1233 |
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1234 // Determine whether the given region is one that we are using as an |
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1235 // old GC alloc region. |
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1236 bool is_old_gc_alloc_region(HeapRegion* hr) { |
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1237 return hr == _retained_old_gc_alloc_region; |
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1238 } |
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1239 |
342 | 1240 // Perform a collection of the heap; intended for use in implementing |
1241 // "System.gc". This probably implies as full a collection as the | |
1242 // "CollectedHeap" supports. | |
1243 virtual void collect(GCCause::Cause cause); | |
1244 | |
1245 // The same as above but assume that the caller holds the Heap_lock. | |
1246 void collect_locked(GCCause::Cause cause); | |
1247 | |
1248 // This interface assumes that it's being called by the | |
1249 // vm thread. It collects the heap assuming that the | |
1250 // heap lock is already held and that we are executing in | |
1251 // the context of the vm thread. | |
1252 virtual void collect_as_vm_thread(GCCause::Cause cause); | |
1253 | |
1254 // True iff a evacuation has failed in the most-recent collection. | |
1255 bool evacuation_failed() { return _evacuation_failed; } | |
1256 | |
2152 | 1257 // It will free a region if it has allocated objects in it that are |
1258 // all dead. It calls either free_region() or | |
1259 // free_humongous_region() depending on the type of the region that | |
1260 // is passed to it. | |
2173 | 1261 void free_region_if_empty(HeapRegion* hr, |
1262 size_t* pre_used, | |
1263 FreeRegionList* free_list, | |
4072 | 1264 OldRegionSet* old_proxy_set, |
2173 | 1265 HumongousRegionSet* humongous_proxy_set, |
1266 HRRSCleanupTask* hrrs_cleanup_task, | |
1267 bool par); | |
342 | 1268 |
2152 | 1269 // It appends the free list to the master free list and updates the |
1270 // master humongous list according to the contents of the proxy | |
1271 // list. It also adjusts the total used bytes according to pre_used | |
1272 // (if par is true, it will do so by taking the ParGCRareEvent_lock). | |
1273 void update_sets_after_freeing_regions(size_t pre_used, | |
1274 FreeRegionList* free_list, | |
4072 | 1275 OldRegionSet* old_proxy_set, |
2152 | 1276 HumongousRegionSet* humongous_proxy_set, |
1277 bool par); | |
342 | 1278 |
4708 | 1279 // Returns "TRUE" iff "p" points into the committed areas of the heap. |
342 | 1280 virtual bool is_in(const void* p) const; |
1281 | |
1282 // Return "TRUE" iff the given object address is within the collection | |
1283 // set. | |
1284 inline bool obj_in_cs(oop obj); | |
1285 | |
1286 // Return "TRUE" iff the given object address is in the reserved | |
1287 // region of g1 (excluding the permanent generation). | |
1288 bool is_in_g1_reserved(const void* p) const { | |
1289 return _g1_reserved.contains(p); | |
1290 } | |
1291 | |
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1292 // Returns a MemRegion that corresponds to the space that has been |
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1293 // reserved for the heap |
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1294 MemRegion g1_reserved() { |
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1295 return _g1_reserved; |
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1296 } |
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1297 |
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1298 // Returns a MemRegion that corresponds to the space that has been |
342 | 1299 // committed in the heap |
1300 MemRegion g1_committed() { | |
1301 return _g1_committed; | |
1302 } | |
1303 | |
2311 | 1304 virtual bool is_in_closed_subset(const void* p) const; |
342 | 1305 |
1306 // This resets the card table to all zeros. It is used after | |
1307 // a collection pause which used the card table to claim cards. | |
1308 void cleanUpCardTable(); | |
1309 | |
1310 // Iteration functions. | |
1311 | |
1312 // Iterate over all the ref-containing fields of all objects, calling | |
1313 // "cl.do_oop" on each. | |
678 | 1314 virtual void oop_iterate(OopClosure* cl) { |
1315 oop_iterate(cl, true); | |
1316 } | |
1317 void oop_iterate(OopClosure* cl, bool do_perm); | |
342 | 1318 |
1319 // Same as above, restricted to a memory region. | |
678 | 1320 virtual void oop_iterate(MemRegion mr, OopClosure* cl) { |
1321 oop_iterate(mr, cl, true); | |
1322 } | |
1323 void oop_iterate(MemRegion mr, OopClosure* cl, bool do_perm); | |
342 | 1324 |
1325 // Iterate over all objects, calling "cl.do_object" on each. | |
678 | 1326 virtual void object_iterate(ObjectClosure* cl) { |
1327 object_iterate(cl, true); | |
1328 } | |
1329 virtual void safe_object_iterate(ObjectClosure* cl) { | |
1330 object_iterate(cl, true); | |
1331 } | |
1332 void object_iterate(ObjectClosure* cl, bool do_perm); | |
342 | 1333 |
1334 // Iterate over all objects allocated since the last collection, calling | |
1335 // "cl.do_object" on each. The heap must have been initialized properly | |
1336 // to support this function, or else this call will fail. | |
1337 virtual void object_iterate_since_last_GC(ObjectClosure* cl); | |
1338 | |
1339 // Iterate over all spaces in use in the heap, in ascending address order. | |
1340 virtual void space_iterate(SpaceClosure* cl); | |
1341 | |
1342 // Iterate over heap regions, in address order, terminating the | |
1343 // iteration early if the "doHeapRegion" method returns "true". | |
3766 | 1344 void heap_region_iterate(HeapRegionClosure* blk) const; |
342 | 1345 |
3766 | 1346 // Return the region with the given index. It assumes the index is valid. |
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1347 HeapRegion* region_at(uint index) const { return _hrs.at(index); } |
342 | 1348 |
1349 // Divide the heap region sequence into "chunks" of some size (the number | |
1350 // of regions divided by the number of parallel threads times some | |
1351 // overpartition factor, currently 4). Assumes that this will be called | |
1352 // in parallel by ParallelGCThreads worker threads with discinct worker | |
1353 // ids in the range [0..max(ParallelGCThreads-1, 1)], that all parallel | |
1354 // calls will use the same "claim_value", and that that claim value is | |
1355 // different from the claim_value of any heap region before the start of | |
1356 // the iteration. Applies "blk->doHeapRegion" to each of the regions, by | |
1357 // attempting to claim the first region in each chunk, and, if | |
1358 // successful, applying the closure to each region in the chunk (and | |
1359 // setting the claim value of the second and subsequent regions of the | |
1360 // chunk.) For now requires that "doHeapRegion" always returns "false", | |
1361 // i.e., that a closure never attempt to abort a traversal. | |
1362 void heap_region_par_iterate_chunked(HeapRegionClosure* blk, | |
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1363 uint worker, |
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1364 uint no_of_par_workers, |
342 | 1365 jint claim_value); |
1366 | |
390 | 1367 // It resets all the region claim values to the default. |
1368 void reset_heap_region_claim_values(); | |
1369 | |
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1370 // Resets the claim values of regions in the current |
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1371 // collection set to the default. |
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1372 void reset_cset_heap_region_claim_values(); |
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1373 |
355 | 1374 #ifdef ASSERT |
1375 bool check_heap_region_claim_values(jint claim_value); | |
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1376 |
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1377 // Same as the routine above but only checks regions in the |
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1378 // current collection set. |
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1379 bool check_cset_heap_region_claim_values(jint claim_value); |
355 | 1380 #endif // ASSERT |
1381 | |
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1382 // Clear the cached cset start regions and (more importantly) |
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1383 // the time stamps. Called when we reset the GC time stamp. |
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1384 void clear_cset_start_regions(); |
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1385 |
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1386 // Given the id of a worker, obtain or calculate a suitable |
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1387 // starting region for iterating over the current collection set. |
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1388 HeapRegion* start_cset_region_for_worker(int worker_i); |
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1389 |
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1390 // This is a convenience method that is used by the |
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1391 // HeapRegionIterator classes to calculate the starting region for |
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1392 // each worker so that they do not all start from the same region. |
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1393 HeapRegion* start_region_for_worker(uint worker_i, uint no_of_par_workers); |
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1394 |
342 | 1395 // Iterate over the regions (if any) in the current collection set. |
1396 void collection_set_iterate(HeapRegionClosure* blk); | |
1397 | |
1398 // As above but starting from region r | |
1399 void collection_set_iterate_from(HeapRegion* r, HeapRegionClosure *blk); | |
1400 | |
1401 // Returns the first (lowest address) compactible space in the heap. | |
1402 virtual CompactibleSpace* first_compactible_space(); | |
1403 | |
1404 // A CollectedHeap will contain some number of spaces. This finds the | |
1405 // space containing a given address, or else returns NULL. | |
1406 virtual Space* space_containing(const void* addr) const; | |
1407 | |
1408 // A G1CollectedHeap will contain some number of heap regions. This | |
1409 // finds the region containing a given address, or else returns NULL. | |
3766 | 1410 template <class T> |
1411 inline HeapRegion* heap_region_containing(const T addr) const; | |
342 | 1412 |
1413 // Like the above, but requires "addr" to be in the heap (to avoid a | |
1414 // null-check), and unlike the above, may return an continuing humongous | |
1415 // region. | |
3766 | 1416 template <class T> |
1417 inline HeapRegion* heap_region_containing_raw(const T addr) const; | |
342 | 1418 |
1419 // A CollectedHeap is divided into a dense sequence of "blocks"; that is, | |
1420 // each address in the (reserved) heap is a member of exactly | |
1421 // one block. The defining characteristic of a block is that it is | |
1422 // possible to find its size, and thus to progress forward to the next | |
1423 // block. (Blocks may be of different sizes.) Thus, blocks may | |
1424 // represent Java objects, or they might be free blocks in a | |
1425 // free-list-based heap (or subheap), as long as the two kinds are | |
1426 // distinguishable and the size of each is determinable. | |
1427 | |
1428 // Returns the address of the start of the "block" that contains the | |
1429 // address "addr". We say "blocks" instead of "object" since some heaps | |
1430 // may not pack objects densely; a chunk may either be an object or a | |
1431 // non-object. | |
1432 virtual HeapWord* block_start(const void* addr) const; | |
1433 | |
1434 // Requires "addr" to be the start of a chunk, and returns its size. | |
1435 // "addr + size" is required to be the start of a new chunk, or the end | |
1436 // of the active area of the heap. | |
1437 virtual size_t block_size(const HeapWord* addr) const; | |
1438 | |
1439 // Requires "addr" to be the start of a block, and returns "TRUE" iff | |
1440 // the block is an object. | |
1441 virtual bool block_is_obj(const HeapWord* addr) const; | |
1442 | |
1443 // Does this heap support heap inspection? (+PrintClassHistogram) | |
1444 virtual bool supports_heap_inspection() const { return true; } | |
1445 | |
1446 // Section on thread-local allocation buffers (TLABs) | |
1447 // See CollectedHeap for semantics. | |
1448 | |
1449 virtual bool supports_tlab_allocation() const; | |
1450 virtual size_t tlab_capacity(Thread* thr) const; | |
1451 virtual size_t unsafe_max_tlab_alloc(Thread* thr) const; | |
1452 | |
1453 // Can a compiler initialize a new object without store barriers? | |
1454 // This permission only extends from the creation of a new object | |
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1455 // via a TLAB up to the first subsequent safepoint. If such permission |
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1456 // is granted for this heap type, the compiler promises to call |
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1457 // defer_store_barrier() below on any slow path allocation of |
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1458 // a new object for which such initializing store barriers will |
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1459 // have been elided. G1, like CMS, allows this, but should be |
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1460 // ready to provide a compensating write barrier as necessary |
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1461 // if that storage came out of a non-young region. The efficiency |
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1462 // of this implementation depends crucially on being able to |
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1463 // answer very efficiently in constant time whether a piece of |
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1464 // storage in the heap comes from a young region or not. |
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1465 // See ReduceInitialCardMarks. |
342 | 1466 virtual bool can_elide_tlab_store_barriers() const { |
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1467 return true; |
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1468 } |
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1469 |
1166 | 1470 virtual bool card_mark_must_follow_store() const { |
1471 return true; | |
1472 } | |
1473 | |
3766 | 1474 bool is_in_young(const oop obj) { |
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1475 HeapRegion* hr = heap_region_containing(obj); |
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1476 return hr != NULL && hr->is_young(); |
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1477 } |
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1478 |
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1479 #ifdef ASSERT |
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1480 virtual bool is_in_partial_collection(const void* p); |
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1481 #endif |
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1482 |
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1483 virtual bool is_scavengable(const void* addr); |
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1484 |
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1485 // We don't need barriers for initializing stores to objects |
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1486 // in the young gen: for the SATB pre-barrier, there is no |
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1487 // pre-value that needs to be remembered; for the remembered-set |
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1488 // update logging post-barrier, we don't maintain remembered set |
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1489 // information for young gen objects. |
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1490 virtual bool can_elide_initializing_store_barrier(oop new_obj) { |
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1491 return is_in_young(new_obj); |
342 | 1492 } |
1493 | |
1494 // Can a compiler elide a store barrier when it writes | |
1495 // a permanent oop into the heap? Applies when the compiler | |
1496 // is storing x to the heap, where x->is_perm() is true. | |
1497 virtual bool can_elide_permanent_oop_store_barriers() const { | |
1498 // At least until perm gen collection is also G1-ified, at | |
1499 // which point this should return false. | |
1500 return true; | |
1501 } | |
1502 | |
1503 // Returns "true" iff the given word_size is "very large". | |
1504 static bool isHumongous(size_t word_size) { | |
1313
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1505 // Note this has to be strictly greater-than as the TLABs |
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1506 // are capped at the humongous thresold and we want to |
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1507 // ensure that we don't try to allocate a TLAB as |
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1508 // humongous and that we don't allocate a humongous |
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1509 // object in a TLAB. |
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1510 return word_size > _humongous_object_threshold_in_words; |
342 | 1511 } |
1512 | |
1513 // Update mod union table with the set of dirty cards. | |
1514 void updateModUnion(); | |
1515 | |
1516 // Set the mod union bits corresponding to the given memRegion. Note | |
1517 // that this is always a safe operation, since it doesn't clear any | |
1518 // bits. | |
1519 void markModUnionRange(MemRegion mr); | |
1520 | |
1521 // Records the fact that a marking phase is no longer in progress. | |
1522 void set_marking_complete() { | |
1523 _mark_in_progress = false; | |
1524 } | |
1525 void set_marking_started() { | |
1526 _mark_in_progress = true; | |
1527 } | |
1528 bool mark_in_progress() { | |
1529 return _mark_in_progress; | |
1530 } | |
1531 | |
1532 // Print the maximum heap capacity. | |
1533 virtual size_t max_capacity() const; | |
1534 | |
1535 virtual jlong millis_since_last_gc(); | |
1536 | |
1537 // Perform any cleanup actions necessary before allowing a verification. | |
1538 virtual void prepare_for_verify(); | |
1539 | |
1540 // Perform verification. | |
811 | 1541 |
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1542 // vo == UsePrevMarking -> use "prev" marking information, |
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1543 // vo == UseNextMarking -> use "next" marking information |
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1544 // vo == UseMarkWord -> use the mark word in the object header |
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1545 // |
811 | 1546 // NOTE: Only the "prev" marking information is guaranteed to be |
1547 // consistent most of the time, so most calls to this should use | |
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1548 // vo == UsePrevMarking. |
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1549 // Currently, there is only one case where this is called with |
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1550 // vo == UseNextMarking, which is to verify the "next" marking |
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1551 // information at the end of remark. |
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1552 // Currently there is only one place where this is called with |
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1553 // vo == UseMarkWord, which is to verify the marking during a |
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1554 // full GC. |
6008 | 1555 void verify(bool silent, VerifyOption vo); |
811 | 1556 |
1557 // Override; it uses the "prev" marking information | |
6008 | 1558 virtual void verify(bool silent); |
342 | 1559 virtual void print_on(outputStream* st) const; |
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1560 virtual void print_extended_on(outputStream* st) const; |
342 | 1561 |
1562 virtual void print_gc_threads_on(outputStream* st) const; | |
1563 virtual void gc_threads_do(ThreadClosure* tc) const; | |
1564 | |
1565 // Override | |
1566 void print_tracing_info() const; | |
1567 | |
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1568 // The following two methods are helpful for debugging RSet issues. |
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1569 void print_cset_rsets() PRODUCT_RETURN; |
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1570 void print_all_rsets() PRODUCT_RETURN; |
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1571 |
342 | 1572 // Convenience function to be used in situations where the heap type can be |
1573 // asserted to be this type. | |
1574 static G1CollectedHeap* heap(); | |
1575 | |
1576 void set_region_short_lived_locked(HeapRegion* hr); | |
1577 // add appropriate methods for any other surv rate groups | |
1578 | |
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1579 YoungList* young_list() { return _young_list; } |
342 | 1580 |
1581 // debugging | |
1582 bool check_young_list_well_formed() { | |
1583 return _young_list->check_list_well_formed(); | |
1584 } | |
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1585 |
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1586 bool check_young_list_empty(bool check_heap, |
342 | 1587 bool check_sample = true); |
1588 | |
1589 // *** Stuff related to concurrent marking. It's not clear to me that so | |
1590 // many of these need to be public. | |
1591 | |
1592 // The functions below are helper functions that a subclass of | |
1593 // "CollectedHeap" can use in the implementation of its virtual | |
1594 // functions. | |
1595 // This performs a concurrent marking of the live objects in a | |
1596 // bitmap off to the side. | |
1597 void doConcurrentMark(); | |
1598 | |
1599 bool isMarkedPrev(oop obj) const; | |
1600 bool isMarkedNext(oop obj) const; | |
1601 | |
1602 // Determine if an object is dead, given the object and also | |
1603 // the region to which the object belongs. An object is dead | |
1604 // iff a) it was not allocated since the last mark and b) it | |
1605 // is not marked. | |
1606 | |
1607 bool is_obj_dead(const oop obj, const HeapRegion* hr) const { | |
1608 return | |
1609 !hr->obj_allocated_since_prev_marking(obj) && | |
1610 !isMarkedPrev(obj); | |
1611 } | |
1612 | |
1613 // This function returns true when an object has been | |
1614 // around since the previous marking and hasn't yet | |
1615 // been marked during this marking. | |
1616 | |
1617 bool is_obj_ill(const oop obj, const HeapRegion* hr) const { | |
1618 return | |
1619 !hr->obj_allocated_since_next_marking(obj) && | |
1620 !isMarkedNext(obj); | |
1621 } | |
1622 | |
1623 // Determine if an object is dead, given only the object itself. | |
1624 // This will find the region to which the object belongs and | |
1625 // then call the region version of the same function. | |
1626 | |
1627 // Added if it is in permanent gen it isn't dead. | |
1628 // Added if it is NULL it isn't dead. | |
1629 | |
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1630 bool is_obj_dead(const oop obj) const { |
811 | 1631 const HeapRegion* hr = heap_region_containing(obj); |
342 | 1632 if (hr == NULL) { |
1633 if (Universe::heap()->is_in_permanent(obj)) | |
1634 return false; | |
1635 else if (obj == NULL) return false; | |
1636 else return true; | |
1637 } | |
1638 else return is_obj_dead(obj, hr); | |
1639 } | |
1640 | |
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1641 bool is_obj_ill(const oop obj) const { |
811 | 1642 const HeapRegion* hr = heap_region_containing(obj); |
342 | 1643 if (hr == NULL) { |
1644 if (Universe::heap()->is_in_permanent(obj)) | |
1645 return false; | |
1646 else if (obj == NULL) return false; | |
1647 else return true; | |
1648 } | |
1649 else return is_obj_ill(obj, hr); | |
1650 } | |
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 |
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1654 // parameter. The options for that parameter are: |
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1655 // |
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1656 // vo == UsePrevMarking -> use "prev" marking information, |
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1657 // vo == UseNextMarking -> use "next" marking information, |
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1658 // vo == UseMarkWord -> use mark word from object header |
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1659 |
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1660 bool is_obj_dead_cond(const oop obj, |
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1661 const HeapRegion* hr, |
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1662 const VerifyOption vo) const { |
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1663 switch (vo) { |
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1664 case VerifyOption_G1UsePrevMarking: return is_obj_dead(obj, hr); |
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1665 case VerifyOption_G1UseNextMarking: return is_obj_ill(obj, hr); |
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1666 case VerifyOption_G1UseMarkWord: return !obj->is_gc_marked(); |
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1667 default: ShouldNotReachHere(); |
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1668 } |
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1669 return false; // keep some compilers happy |
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1670 } |
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1671 |
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1672 bool is_obj_dead_cond(const oop obj, |
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1673 const VerifyOption vo) const { |
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1674 switch (vo) { |
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1675 case VerifyOption_G1UsePrevMarking: return is_obj_dead(obj); |
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1676 case VerifyOption_G1UseNextMarking: return is_obj_ill(obj); |
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1677 case VerifyOption_G1UseMarkWord: return !obj->is_gc_marked(); |
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1678 default: ShouldNotReachHere(); |
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1679 } |
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1680 return false; // keep some compilers happy |
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1681 } |
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1682 |
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1683 bool allocated_since_marking(oop obj, HeapRegion* hr, VerifyOption vo); |
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1684 HeapWord* top_at_mark_start(HeapRegion* hr, VerifyOption vo); |
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1685 bool is_marked(oop obj, VerifyOption vo); |
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1686 const char* top_at_mark_start_str(VerifyOption vo); |
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1687 |
342 | 1688 // The following is just to alert the verification code |
1689 // that a full collection has occurred and that the | |
1690 // remembered sets are no longer up to date. | |
1691 bool _full_collection; | |
1692 void set_full_collection() { _full_collection = true;} | |
1693 void clear_full_collection() {_full_collection = false;} | |
1694 bool full_collection() {return _full_collection;} | |
1695 | |
1696 ConcurrentMark* concurrent_mark() const { return _cm; } | |
1697 ConcurrentG1Refine* concurrent_g1_refine() const { return _cg1r; } | |
1698 | |
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1699 // The dirty cards region list is used to record a subset of regions |
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1700 // whose cards need clearing. The list if populated during the |
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1701 // remembered set scanning and drained during the card table |
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1702 // cleanup. Although the methods are reentrant, population/draining |
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1703 // phases must not overlap. For synchronization purposes the last |
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1704 // element on the list points to itself. |
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1705 HeapRegion* _dirty_cards_region_list; |
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1706 void push_dirty_cards_region(HeapRegion* hr); |
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1707 HeapRegion* pop_dirty_cards_region(); |
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1708 |
342 | 1709 public: |
1710 void stop_conc_gc_threads(); | |
1711 | |
1712 size_t pending_card_num(); | |
1713 size_t cards_scanned(); | |
1714 | |
1715 protected: | |
1716 size_t _max_heap_capacity; | |
1717 }; | |
1718 | |
845
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1719 class G1ParGCAllocBuffer: public ParGCAllocBuffer { |
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1720 private: |
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1721 bool _retired; |
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1722 |
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1723 public: |
3886
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1724 G1ParGCAllocBuffer(size_t gclab_word_size); |
845
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1725 |
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1726 void set_buf(HeapWord* buf) { |
845
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1727 ParGCAllocBuffer::set_buf(buf); |
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1728 _retired = false; |
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1729 } |
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1730 |
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1731 void retire(bool end_of_gc, bool retain) { |
845
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1732 if (_retired) |
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1733 return; |
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1734 ParGCAllocBuffer::retire(end_of_gc, retain); |
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1735 _retired = true; |
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1736 } |
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1737 }; |
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1738 |
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1739 class G1ParScanThreadState : public StackObj { |
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1740 protected: |
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1741 G1CollectedHeap* _g1h; |
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1742 RefToScanQueue* _refs; |
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1743 DirtyCardQueue _dcq; |
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1744 CardTableModRefBS* _ct_bs; |
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1745 G1RemSet* _g1_rem; |
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1746 |
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1747 G1ParGCAllocBuffer _surviving_alloc_buffer; |
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1748 G1ParGCAllocBuffer _tenured_alloc_buffer; |
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1749 G1ParGCAllocBuffer* _alloc_buffers[GCAllocPurposeCount]; |
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1750 ageTable _age_table; |
845
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1751 |
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1752 size_t _alloc_buffer_waste; |
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1753 size_t _undo_waste; |
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1754 |
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1755 OopsInHeapRegionClosure* _evac_failure_cl; |
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1756 G1ParScanHeapEvacClosure* _evac_cl; |
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1757 G1ParScanPartialArrayClosure* _partial_scan_cl; |
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1758 |
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1759 int _hash_seed; |
4836
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1760 uint _queue_num; |
845
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1761 |
1611 | 1762 size_t _term_attempts; |
845
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1763 |
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1764 double _start; |
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1765 double _start_strong_roots; |
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1766 double _strong_roots_time; |
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1767 double _start_term; |
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1768 double _term_time; |
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1769 |
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1770 // Map from young-age-index (0 == not young, 1 is youngest) to |
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1771 // surviving words. base is what we get back from the malloc call |
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1772 size_t* _surviving_young_words_base; |
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1773 // this points into the array, as we use the first few entries for padding |
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1774 size_t* _surviving_young_words; |
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1775 |
1709 | 1776 #define PADDING_ELEM_NUM (DEFAULT_CACHE_LINE_SIZE / sizeof(size_t)) |
845
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1777 |
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1778 void add_to_alloc_buffer_waste(size_t waste) { _alloc_buffer_waste += waste; } |
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1779 |
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1780 void add_to_undo_waste(size_t waste) { _undo_waste += waste; } |
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1781 |
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1782 DirtyCardQueue& dirty_card_queue() { return _dcq; } |
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1783 CardTableModRefBS* ctbs() { return _ct_bs; } |
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1784 |
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1785 template <class T> void immediate_rs_update(HeapRegion* from, T* p, int tid) { |
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1786 if (!from->is_survivor()) { |
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1787 _g1_rem->par_write_ref(from, p, tid); |
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1788 } |
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1789 } |
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1790 |
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1791 template <class T> void deferred_rs_update(HeapRegion* from, T* p, int tid) { |
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1792 // If the new value of the field points to the same region or |
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1793 // is the to-space, we don't need to include it in the Rset updates. |
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1794 if (!from->is_in_reserved(oopDesc::load_decode_heap_oop(p)) && !from->is_survivor()) { |
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1795 size_t card_index = ctbs()->index_for(p); |
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1796 // If the card hasn't been added to the buffer, do it. |
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1797 if (ctbs()->mark_card_deferred(card_index)) { |
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1798 dirty_card_queue().enqueue((jbyte*)ctbs()->byte_for_index(card_index)); |
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1799 } |
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1800 } |
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1801 } |
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1802 |
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1803 public: |
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1804 G1ParScanThreadState(G1CollectedHeap* g1h, uint queue_num); |
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1805 |
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1806 ~G1ParScanThreadState() { |
6197 | 1807 FREE_C_HEAP_ARRAY(size_t, _surviving_young_words_base, mtGC); |
845
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1808 } |
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1809 |
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1810 RefToScanQueue* refs() { return _refs; } |
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1811 ageTable* age_table() { return &_age_table; } |
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1812 |
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1813 G1ParGCAllocBuffer* alloc_buffer(GCAllocPurpose purpose) { |
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1814 return _alloc_buffers[purpose]; |
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1815 } |
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1816 |
1709 | 1817 size_t alloc_buffer_waste() const { return _alloc_buffer_waste; } |
1818 size_t undo_waste() const { return _undo_waste; } | |
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1819 |
1862
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1820 #ifdef ASSERT |
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1821 bool verify_ref(narrowOop* ref) const; |
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1822 bool verify_ref(oop* ref) const; |
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1823 bool verify_task(StarTask ref) const; |
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1824 #endif // ASSERT |
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1825 |
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1826 template <class T> void push_on_queue(T* ref) { |
1862
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1827 assert(verify_ref(ref), "sanity"); |
1709 | 1828 refs()->push(ref); |
845
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1829 } |
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1830 |
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1831 template <class T> void update_rs(HeapRegion* from, T* p, int tid) { |
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1832 if (G1DeferredRSUpdate) { |
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1833 deferred_rs_update(from, p, tid); |
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1834 } else { |
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1835 immediate_rs_update(from, p, tid); |
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1836 } |
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1837 } |
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1838 |
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1839 HeapWord* allocate_slow(GCAllocPurpose purpose, size_t word_sz) { |
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1840 HeapWord* obj = NULL; |
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1841 size_t gclab_word_size = _g1h->desired_plab_sz(purpose); |
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1842 if (word_sz * 100 < gclab_word_size * ParallelGCBufferWastePct) { |
845
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1843 G1ParGCAllocBuffer* alloc_buf = alloc_buffer(purpose); |
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1844 add_to_alloc_buffer_waste(alloc_buf->words_remaining()); |
6595 | 1845 alloc_buf->flush_stats_and_retire(_g1h->stats_for_purpose(purpose), |
1846 false /* end_of_gc */, | |
1847 false /* retain */); | |
845
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1848 |
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1849 HeapWord* buf = _g1h->par_allocate_during_gc(purpose, gclab_word_size); |
845
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1850 if (buf == NULL) return NULL; // Let caller handle allocation failure. |
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1851 // Otherwise. |
6595 | 1852 alloc_buf->set_word_size(gclab_word_size); |
845
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1853 alloc_buf->set_buf(buf); |
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1854 |
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1855 obj = alloc_buf->allocate(word_sz); |
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1856 assert(obj != NULL, "buffer was definitely big enough..."); |
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1857 } else { |
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1858 obj = _g1h->par_allocate_during_gc(purpose, word_sz); |
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1859 } |
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1860 return obj; |
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1861 } |
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1862 |
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1863 HeapWord* allocate(GCAllocPurpose purpose, size_t word_sz) { |
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1864 HeapWord* obj = alloc_buffer(purpose)->allocate(word_sz); |
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1865 if (obj != NULL) return obj; |
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1866 return allocate_slow(purpose, word_sz); |
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1867 } |
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1868 |
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1869 void undo_allocation(GCAllocPurpose purpose, HeapWord* obj, size_t word_sz) { |
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1870 if (alloc_buffer(purpose)->contains(obj)) { |
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1871 assert(alloc_buffer(purpose)->contains(obj + word_sz - 1), |
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1872 "should contain whole object"); |
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1873 alloc_buffer(purpose)->undo_allocation(obj, word_sz); |
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1874 } else { |
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1875 CollectedHeap::fill_with_object(obj, word_sz); |
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1876 add_to_undo_waste(word_sz); |
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1877 } |
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1878 } |
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1879 |
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1880 void set_evac_failure_closure(OopsInHeapRegionClosure* evac_failure_cl) { |
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1881 _evac_failure_cl = evac_failure_cl; |
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1882 } |
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1883 OopsInHeapRegionClosure* evac_failure_closure() { |
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1884 return _evac_failure_cl; |
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1885 } |
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1886 |
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1887 void set_evac_closure(G1ParScanHeapEvacClosure* evac_cl) { |
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1888 _evac_cl = evac_cl; |
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1889 } |
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1890 |
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1891 void set_partial_scan_closure(G1ParScanPartialArrayClosure* partial_scan_cl) { |
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1892 _partial_scan_cl = partial_scan_cl; |
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1893 } |
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1894 |
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1895 int* hash_seed() { return &_hash_seed; } |
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1896 uint queue_num() { return _queue_num; } |
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1897 |
1709 | 1898 size_t term_attempts() const { return _term_attempts; } |
1611 | 1899 void note_term_attempt() { _term_attempts++; } |
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1900 |
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1901 void start_strong_roots() { |
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1902 _start_strong_roots = os::elapsedTime(); |
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1903 } |
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1904 void end_strong_roots() { |
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1905 _strong_roots_time += (os::elapsedTime() - _start_strong_roots); |
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1906 } |
1709 | 1907 double strong_roots_time() const { return _strong_roots_time; } |
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1908 |
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1909 void start_term_time() { |
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1910 note_term_attempt(); |
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1911 _start_term = os::elapsedTime(); |
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1912 } |
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1913 void end_term_time() { |
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1914 _term_time += (os::elapsedTime() - _start_term); |
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1915 } |
1709 | 1916 double term_time() const { return _term_time; } |
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1917 |
1709 | 1918 double elapsed_time() const { |
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1919 return os::elapsedTime() - _start; |
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1920 } |
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1921 |
1709 | 1922 static void |
1923 print_termination_stats_hdr(outputStream* const st = gclog_or_tty); | |
1924 void | |
1925 print_termination_stats(int i, outputStream* const st = gclog_or_tty) const; | |
1926 | |
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1927 size_t* surviving_young_words() { |
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1928 // We add on to hide entry 0 which accumulates surviving words for |
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1929 // age -1 regions (i.e. non-young ones) |
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1930 return _surviving_young_words; |
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1931 } |
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1932 |
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1933 void retire_alloc_buffers() { |
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1934 for (int ap = 0; ap < GCAllocPurposeCount; ++ap) { |
1391
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1935 size_t waste = _alloc_buffers[ap]->words_remaining(); |
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1936 add_to_alloc_buffer_waste(waste); |
6595 | 1937 _alloc_buffers[ap]->flush_stats_and_retire(_g1h->stats_for_purpose((GCAllocPurpose)ap), |
1938 true /* end_of_gc */, | |
1939 false /* retain */); | |
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1940 } |
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1941 } |
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1942 |
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1943 template <class T> void deal_with_reference(T* ref_to_scan) { |
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1944 if (has_partial_array_mask(ref_to_scan)) { |
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1945 _partial_scan_cl->do_oop_nv(ref_to_scan); |
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1946 } else { |
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1947 // Note: we can use "raw" versions of "region_containing" because |
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1948 // "obj_to_scan" is definitely in the heap, and is not in a |
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1949 // humongous region. |
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1950 HeapRegion* r = _g1h->heap_region_containing_raw(ref_to_scan); |
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1951 _evac_cl->set_region(r); |
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1952 _evac_cl->do_oop_nv(ref_to_scan); |
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1953 } |
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1954 } |
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1955 |
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1956 void deal_with_reference(StarTask ref) { |
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1957 assert(verify_task(ref), "sanity"); |
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1958 if (ref.is_narrow()) { |
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1959 deal_with_reference((narrowOop*)ref); |
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1960 } else { |
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1961 deal_with_reference((oop*)ref); |
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1962 } |
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1963 } |
1862
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1964 |
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1965 public: |
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1966 void trim_queue(); |
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1967 }; |
1972 | 1968 |
1969 #endif // SHARE_VM_GC_IMPLEMENTATION_G1_G1COLLECTEDHEAP_HPP |