Mercurial > hg > graal-compiler
annotate src/share/vm/gc_implementation/g1/g1CollectedHeap.hpp @ 20738:e2ed74d2e054
8044406: JVM crash with JDK8 (build 1.8.0-b132) with G1 GC
Summary: Fill the last card that has been allocated into with a dummy object
Reviewed-by: tschatzl, mgerdin
author | poonam |
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date | Tue, 19 Aug 2014 02:05:49 -0700 |
parents | a45a4f5a9609 |
children | c2844108a708 |
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342 | 1 /* |
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2 * Copyright (c) 2001, 2014, Oracle and/or its affiliates. All rights reserved. |
342 | 3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
4 * | |
5 * This code is free software; you can redistribute it and/or modify it | |
6 * under the terms of the GNU General Public License version 2 only, as | |
7 * published by the Free Software Foundation. | |
8 * | |
9 * This code is distributed in the hope that it will be useful, but WITHOUT | |
10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or | |
11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License | |
12 * version 2 for more details (a copy is included in the LICENSE file that | |
13 * accompanied this code). | |
14 * | |
15 * You should have received a copy of the GNU General Public License version | |
16 * 2 along with this work; if not, write to the Free Software Foundation, | |
17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. | |
18 * | |
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19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
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20 * or visit www.oracle.com if you need additional information or have any |
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21 * questions. |
342 | 22 * |
23 */ | |
24 | |
1972 | 25 #ifndef SHARE_VM_GC_IMPLEMENTATION_G1_G1COLLECTEDHEAP_HPP |
26 #define SHARE_VM_GC_IMPLEMENTATION_G1_G1COLLECTEDHEAP_HPP | |
27 | |
28 #include "gc_implementation/g1/concurrentMark.hpp" | |
10405 | 29 #include "gc_implementation/g1/evacuationInfo.hpp" |
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30 #include "gc_implementation/g1/g1AllocRegion.hpp" |
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31 #include "gc_implementation/g1/g1HRPrinter.hpp" |
10405 | 32 #include "gc_implementation/g1/g1MonitoringSupport.hpp" |
1972 | 33 #include "gc_implementation/g1/g1RemSet.hpp" |
12343 | 34 #include "gc_implementation/g1/g1SATBCardTableModRefBS.hpp" |
10405 | 35 #include "gc_implementation/g1/g1YCTypes.hpp" |
3766 | 36 #include "gc_implementation/g1/heapRegionSeq.hpp" |
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37 #include "gc_implementation/g1/heapRegionSet.hpp" |
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38 #include "gc_implementation/shared/hSpaceCounters.hpp" |
6595 | 39 #include "gc_implementation/shared/parGCAllocBuffer.hpp" |
1972 | 40 #include "memory/barrierSet.hpp" |
41 #include "memory/memRegion.hpp" | |
42 #include "memory/sharedHeap.hpp" | |
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43 #include "utilities/stack.hpp" |
1972 | 44 |
342 | 45 // A "G1CollectedHeap" is an implementation of a java heap for HotSpot. |
46 // It uses the "Garbage First" heap organization and algorithm, which | |
47 // may combine concurrent marking with parallel, incremental compaction of | |
48 // heap subsets that will yield large amounts of garbage. | |
49 | |
12080 | 50 // Forward declarations |
342 | 51 class HeapRegion; |
2173 | 52 class HRRSCleanupTask; |
342 | 53 class GenerationSpec; |
54 class OopsInHeapRegionClosure; | |
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55 class G1KlassScanClosure; |
342 | 56 class G1ScanHeapEvacClosure; |
57 class ObjectClosure; | |
58 class SpaceClosure; | |
59 class CompactibleSpaceClosure; | |
60 class Space; | |
61 class G1CollectorPolicy; | |
62 class GenRemSet; | |
63 class G1RemSet; | |
64 class HeapRegionRemSetIterator; | |
65 class ConcurrentMark; | |
66 class ConcurrentMarkThread; | |
67 class ConcurrentG1Refine; | |
10405 | 68 class ConcurrentGCTimer; |
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69 class GenerationCounters; |
10405 | 70 class STWGCTimer; |
71 class G1NewTracer; | |
72 class G1OldTracer; | |
73 class EvacuationFailedInfo; | |
12080 | 74 class nmethod; |
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75 class Ticks; |
342 | 76 |
6197 | 77 typedef OverflowTaskQueue<StarTask, mtGC> RefToScanQueue; |
78 typedef GenericTaskQueueSet<RefToScanQueue, mtGC> RefToScanQueueSet; | |
342 | 79 |
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80 typedef int RegionIdx_t; // needs to hold [ 0..max_regions() ) |
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81 typedef int CardIdx_t; // needs to hold [ 0..CardsPerRegion ) |
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82 |
342 | 83 enum GCAllocPurpose { |
84 GCAllocForTenured, | |
85 GCAllocForSurvived, | |
86 GCAllocPurposeCount | |
87 }; | |
88 | |
6197 | 89 class YoungList : public CHeapObj<mtGC> { |
342 | 90 private: |
91 G1CollectedHeap* _g1h; | |
92 | |
93 HeapRegion* _head; | |
94 | |
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95 HeapRegion* _survivor_head; |
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96 HeapRegion* _survivor_tail; |
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97 |
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98 HeapRegion* _curr; |
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99 |
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100 uint _length; |
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101 uint _survivor_length; |
342 | 102 |
103 size_t _last_sampled_rs_lengths; | |
104 size_t _sampled_rs_lengths; | |
105 | |
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106 void empty_list(HeapRegion* list); |
342 | 107 |
108 public: | |
109 YoungList(G1CollectedHeap* g1h); | |
110 | |
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111 void push_region(HeapRegion* hr); |
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112 void add_survivor_region(HeapRegion* hr); |
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113 |
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114 void empty_list(); |
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115 bool is_empty() { return _length == 0; } |
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116 uint length() { return _length; } |
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117 uint survivor_length() { return _survivor_length; } |
342 | 118 |
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119 // Currently we do not keep track of the used byte sum for the |
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120 // young list and the survivors and it'd be quite a lot of work to |
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121 // do so. When we'll eventually replace the young list with |
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122 // instances of HeapRegionLinkedList we'll get that for free. So, |
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123 // we'll report the more accurate information then. |
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124 size_t eden_used_bytes() { |
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125 assert(length() >= survivor_length(), "invariant"); |
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126 return (size_t) (length() - survivor_length()) * HeapRegion::GrainBytes; |
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127 } |
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128 size_t survivor_used_bytes() { |
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129 return (size_t) survivor_length() * HeapRegion::GrainBytes; |
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130 } |
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131 |
342 | 132 void rs_length_sampling_init(); |
133 bool rs_length_sampling_more(); | |
134 void rs_length_sampling_next(); | |
135 | |
136 void reset_sampled_info() { | |
137 _last_sampled_rs_lengths = 0; | |
138 } | |
139 size_t sampled_rs_lengths() { return _last_sampled_rs_lengths; } | |
140 | |
141 // for development purposes | |
142 void reset_auxilary_lists(); | |
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143 void clear() { _head = NULL; _length = 0; } |
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144 |
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145 void clear_survivors() { |
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146 _survivor_head = NULL; |
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147 _survivor_tail = NULL; |
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148 _survivor_length = 0; |
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149 } |
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150 |
342 | 151 HeapRegion* first_region() { return _head; } |
152 HeapRegion* first_survivor_region() { return _survivor_head; } | |
545 | 153 HeapRegion* last_survivor_region() { return _survivor_tail; } |
342 | 154 |
155 // debugging | |
156 bool check_list_well_formed(); | |
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157 bool check_list_empty(bool check_sample = true); |
342 | 158 void print(); |
159 }; | |
160 | |
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161 class MutatorAllocRegion : public G1AllocRegion { |
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162 protected: |
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163 virtual HeapRegion* allocate_new_region(size_t word_size, bool force); |
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164 virtual void retire_region(HeapRegion* alloc_region, size_t allocated_bytes); |
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165 public: |
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166 MutatorAllocRegion() |
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167 : G1AllocRegion("Mutator Alloc Region", false /* bot_updates */) { } |
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168 }; |
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169 |
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170 class SurvivorGCAllocRegion : public G1AllocRegion { |
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171 protected: |
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172 virtual HeapRegion* allocate_new_region(size_t word_size, bool force); |
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173 virtual void retire_region(HeapRegion* alloc_region, size_t allocated_bytes); |
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174 public: |
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175 SurvivorGCAllocRegion() |
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176 : G1AllocRegion("Survivor GC Alloc Region", false /* bot_updates */) { } |
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177 }; |
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178 |
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179 class OldGCAllocRegion : public G1AllocRegion { |
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180 protected: |
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181 virtual HeapRegion* allocate_new_region(size_t word_size, bool force); |
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182 virtual void retire_region(HeapRegion* alloc_region, size_t allocated_bytes); |
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183 public: |
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184 OldGCAllocRegion() |
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185 : G1AllocRegion("Old GC Alloc Region", true /* bot_updates */) { } |
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186 |
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187 // This specialization of release() makes sure that the last card that has been |
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188 // allocated into has been completely filled by a dummy object. |
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189 // This avoids races when remembered set scanning wants to update the BOT of the |
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190 // last card in the retained old gc alloc region, and allocation threads |
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191 // allocating into that card at the same time. |
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192 virtual HeapRegion* release(); |
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193 }; |
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194 |
12080 | 195 // The G1 STW is alive closure. |
196 // An instance is embedded into the G1CH and used as the | |
197 // (optional) _is_alive_non_header closure in the STW | |
198 // reference processor. It is also extensively used during | |
199 // reference processing during STW evacuation pauses. | |
200 class G1STWIsAliveClosure: public BoolObjectClosure { | |
201 G1CollectedHeap* _g1; | |
202 public: | |
203 G1STWIsAliveClosure(G1CollectedHeap* g1) : _g1(g1) {} | |
204 bool do_object_b(oop p); | |
205 }; | |
206 | |
342 | 207 class RefineCardTableEntryClosure; |
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208 |
342 | 209 class G1CollectedHeap : public SharedHeap { |
210 friend class VM_G1CollectForAllocation; | |
211 friend class VM_G1CollectFull; | |
212 friend class VM_G1IncCollectionPause; | |
213 friend class VMStructs; | |
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214 friend class MutatorAllocRegion; |
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215 friend class SurvivorGCAllocRegion; |
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216 friend class OldGCAllocRegion; |
342 | 217 |
218 // Closures used in implementation. | |
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219 template <G1Barrier barrier, bool do_mark_object> |
5987 | 220 friend class G1ParCopyClosure; |
342 | 221 friend class G1IsAliveClosure; |
222 friend class G1EvacuateFollowersClosure; | |
223 friend class G1ParScanThreadState; | |
224 friend class G1ParScanClosureSuper; | |
225 friend class G1ParEvacuateFollowersClosure; | |
226 friend class G1ParTask; | |
227 friend class G1FreeGarbageRegionClosure; | |
228 friend class RefineCardTableEntryClosure; | |
229 friend class G1PrepareCompactClosure; | |
230 friend class RegionSorter; | |
2152 | 231 friend class RegionResetter; |
342 | 232 friend class CountRCClosure; |
233 friend class EvacPopObjClosure; | |
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234 friend class G1ParCleanupCTTask; |
342 | 235 |
236 // Other related classes. | |
237 friend class G1MarkSweep; | |
238 | |
239 private: | |
240 // The one and only G1CollectedHeap, so static functions can find it. | |
241 static G1CollectedHeap* _g1h; | |
242 | |
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243 static size_t _humongous_object_threshold_in_words; |
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244 |
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245 // Storage for the G1 heap. |
342 | 246 VirtualSpace _g1_storage; |
247 MemRegion _g1_reserved; | |
248 | |
249 // The part of _g1_storage that is currently committed. | |
250 MemRegion _g1_committed; | |
251 | |
2152 | 252 // The master free list. It will satisfy all new region allocations. |
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253 FreeRegionList _free_list; |
2152 | 254 |
255 // The secondary free list which contains regions that have been | |
256 // freed up during the cleanup process. This will be appended to the | |
257 // master free list when appropriate. | |
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258 FreeRegionList _secondary_free_list; |
2152 | 259 |
4072 | 260 // It keeps track of the old regions. |
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261 HeapRegionSet _old_set; |
4072 | 262 |
2152 | 263 // It keeps track of the humongous regions. |
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264 HeapRegionSet _humongous_set; |
342 | 265 |
266 // The number of regions we could create by expansion. | |
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267 uint _expansion_regions; |
342 | 268 |
269 // The block offset table for the G1 heap. | |
270 G1BlockOffsetSharedArray* _bot_shared; | |
271 | |
4072 | 272 // Tears down the region sets / lists so that they are empty and the |
273 // regions on the heap do not belong to a region set / list. The | |
274 // only exception is the humongous set which we leave unaltered. If | |
275 // free_list_only is true, it will only tear down the master free | |
276 // list. It is called before a Full GC (free_list_only == false) or | |
277 // before heap shrinking (free_list_only == true). | |
278 void tear_down_region_sets(bool free_list_only); | |
279 | |
280 // Rebuilds the region sets / lists so that they are repopulated to | |
281 // reflect the contents of the heap. The only exception is the | |
282 // humongous set which was not torn down in the first place. If | |
283 // free_list_only is true, it will only rebuild the master free | |
284 // list. It is called after a Full GC (free_list_only == false) or | |
285 // after heap shrinking (free_list_only == true). | |
286 void rebuild_region_sets(bool free_list_only); | |
342 | 287 |
288 // The sequence of all heap regions in the heap. | |
3766 | 289 HeapRegionSeq _hrs; |
342 | 290 |
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291 // Alloc region used to satisfy mutator allocation requests. |
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292 MutatorAllocRegion _mutator_alloc_region; |
342 | 293 |
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294 // Alloc region used to satisfy allocation requests by the GC for |
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295 // survivor objects. |
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296 SurvivorGCAllocRegion _survivor_gc_alloc_region; |
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297 |
6595 | 298 // PLAB sizing policy for survivors. |
299 PLABStats _survivor_plab_stats; | |
300 | |
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301 // Alloc region used to satisfy allocation requests by the GC for |
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302 // old objects. |
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303 OldGCAllocRegion _old_gc_alloc_region; |
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304 |
6595 | 305 // PLAB sizing policy for tenured objects. |
306 PLABStats _old_plab_stats; | |
307 | |
308 PLABStats* stats_for_purpose(GCAllocPurpose purpose) { | |
309 PLABStats* stats = NULL; | |
310 | |
311 switch (purpose) { | |
312 case GCAllocForSurvived: | |
313 stats = &_survivor_plab_stats; | |
314 break; | |
315 case GCAllocForTenured: | |
316 stats = &_old_plab_stats; | |
317 break; | |
318 default: | |
319 assert(false, "unrecognized GCAllocPurpose"); | |
320 } | |
321 | |
322 return stats; | |
323 } | |
324 | |
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325 // The last old region we allocated to during the last GC. |
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326 // Typically, it is not full so we should re-use it during the next GC. |
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327 HeapRegion* _retained_old_gc_alloc_region; |
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328 |
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329 // It specifies whether we should attempt to expand the heap after a |
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330 // region allocation failure. If heap expansion fails we set this to |
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331 // false so that we don't re-attempt the heap expansion (it's likely |
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332 // that subsequent expansion attempts will also fail if one fails). |
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333 // Currently, it is only consulted during GC and it's reset at the |
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334 // start of each GC. |
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335 bool _expand_heap_after_alloc_failure; |
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336 |
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337 // It resets the mutator alloc region before new allocations can take place. |
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338 void init_mutator_alloc_region(); |
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339 |
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340 // It releases the mutator alloc region. |
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341 void release_mutator_alloc_region(); |
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342 |
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343 // It initializes the GC alloc regions at the start of a GC. |
10405 | 344 void init_gc_alloc_regions(EvacuationInfo& evacuation_info); |
342 | 345 |
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346 // It releases the GC alloc regions at the end of a GC. |
10405 | 347 void release_gc_alloc_regions(uint no_of_gc_workers, EvacuationInfo& evacuation_info); |
342 | 348 |
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349 // It does any cleanup that needs to be done on the GC alloc regions |
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350 // before a Full GC. |
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351 void abandon_gc_alloc_regions(); |
342 | 352 |
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353 // Helper for monitoring and management support. |
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354 G1MonitoringSupport* _g1mm; |
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355 |
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356 // Determines PLAB size for a particular allocation purpose. |
6595 | 357 size_t desired_plab_sz(GCAllocPurpose purpose); |
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358 |
342 | 359 // Outside of GC pauses, the number of bytes used in all regions other |
360 // than the current allocation region. | |
361 size_t _summary_bytes_used; | |
362 | |
526 | 363 // This is used for a quick test on whether a reference points into |
364 // the collection set or not. Basically, we have an array, with one | |
365 // byte per region, and that byte denotes whether the corresponding | |
366 // region is in the collection set or not. The entry corresponding | |
367 // the bottom of the heap, i.e., region 0, is pointed to by | |
368 // _in_cset_fast_test_base. The _in_cset_fast_test field has been | |
369 // biased so that it actually points to address 0 of the address | |
370 // space, to make the test as fast as possible (we can simply shift | |
371 // the address to address into it, instead of having to subtract the | |
372 // bottom of the heap from the address before shifting it; basically | |
373 // it works in the same way the card table works). | |
374 bool* _in_cset_fast_test; | |
375 | |
376 // The allocated array used for the fast test on whether a reference | |
377 // points into the collection set or not. This field is also used to | |
378 // free the array. | |
379 bool* _in_cset_fast_test_base; | |
380 | |
381 // The length of the _in_cset_fast_test_base array. | |
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382 uint _in_cset_fast_test_length; |
526 | 383 |
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384 volatile unsigned _gc_time_stamp; |
342 | 385 |
386 size_t* _surviving_young_words; | |
387 | |
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388 G1HRPrinter _hr_printer; |
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389 |
342 | 390 void setup_surviving_young_words(); |
391 void update_surviving_young_words(size_t* surv_young_words); | |
392 void cleanup_surviving_young_words(); | |
393 | |
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394 // It decides whether an explicit GC should start a concurrent cycle |
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395 // instead of doing a STW GC. Currently, a concurrent cycle is |
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396 // explicitly started if: |
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397 // (a) cause == _gc_locker and +GCLockerInvokesConcurrent, or |
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398 // (b) cause == _java_lang_system_gc and +ExplicitGCInvokesConcurrent. |
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399 // (c) cause == _g1_humongous_allocation |
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400 bool should_do_concurrent_full_gc(GCCause::Cause cause); |
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401 |
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402 // Keeps track of how many "old marking cycles" (i.e., Full GCs or |
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403 // concurrent cycles) we have started. |
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404 volatile unsigned int _old_marking_cycles_started; |
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405 |
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406 // Keeps track of how many "old marking cycles" (i.e., Full GCs or |
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407 // concurrent cycles) we have completed. |
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408 volatile unsigned int _old_marking_cycles_completed; |
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409 |
10405 | 410 bool _concurrent_cycle_started; |
411 | |
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412 // This is a non-product method that is helpful for testing. It is |
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413 // called at the end of a GC and artificially expands the heap by |
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414 // allocating a number of dead regions. This way we can induce very |
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415 // frequent marking cycles and stress the cleanup / concurrent |
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416 // cleanup code more (as all the regions that will be allocated by |
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417 // this method will be found dead by the marking cycle). |
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418 void allocate_dummy_regions() PRODUCT_RETURN; |
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419 |
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420 // Clear RSets after a compaction. It also resets the GC time stamps. |
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421 void clear_rsets_post_compaction(); |
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422 |
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423 // If the HR printer is active, dump the state of the regions in the |
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424 // heap after a compaction. |
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425 void print_hrs_post_compaction(); |
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426 |
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427 double verify(bool guard, const char* msg); |
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428 void verify_before_gc(); |
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429 void verify_after_gc(); |
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430 |
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431 void log_gc_header(); |
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432 void log_gc_footer(double pause_time_sec); |
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433 |
1973 | 434 // These are macros so that, if the assert fires, we get the correct |
435 // line number, file, etc. | |
436 | |
2361 | 437 #define heap_locking_asserts_err_msg(_extra_message_) \ |
2152 | 438 err_msg("%s : Heap_lock locked: %s, at safepoint: %s, is VM thread: %s", \ |
2361 | 439 (_extra_message_), \ |
2152 | 440 BOOL_TO_STR(Heap_lock->owned_by_self()), \ |
441 BOOL_TO_STR(SafepointSynchronize::is_at_safepoint()), \ | |
442 BOOL_TO_STR(Thread::current()->is_VM_thread())) | |
1973 | 443 |
444 #define assert_heap_locked() \ | |
445 do { \ | |
446 assert(Heap_lock->owned_by_self(), \ | |
447 heap_locking_asserts_err_msg("should be holding the Heap_lock")); \ | |
448 } while (0) | |
449 | |
2361 | 450 #define assert_heap_locked_or_at_safepoint(_should_be_vm_thread_) \ |
1973 | 451 do { \ |
452 assert(Heap_lock->owned_by_self() || \ | |
2152 | 453 (SafepointSynchronize::is_at_safepoint() && \ |
2361 | 454 ((_should_be_vm_thread_) == Thread::current()->is_VM_thread())), \ |
1973 | 455 heap_locking_asserts_err_msg("should be holding the Heap_lock or " \ |
456 "should be at a safepoint")); \ | |
457 } while (0) | |
458 | |
459 #define assert_heap_locked_and_not_at_safepoint() \ | |
460 do { \ | |
461 assert(Heap_lock->owned_by_self() && \ | |
462 !SafepointSynchronize::is_at_safepoint(), \ | |
463 heap_locking_asserts_err_msg("should be holding the Heap_lock and " \ | |
464 "should not be at a safepoint")); \ | |
465 } while (0) | |
466 | |
467 #define assert_heap_not_locked() \ | |
468 do { \ | |
469 assert(!Heap_lock->owned_by_self(), \ | |
470 heap_locking_asserts_err_msg("should not be holding the Heap_lock")); \ | |
471 } while (0) | |
472 | |
473 #define assert_heap_not_locked_and_not_at_safepoint() \ | |
474 do { \ | |
475 assert(!Heap_lock->owned_by_self() && \ | |
476 !SafepointSynchronize::is_at_safepoint(), \ | |
477 heap_locking_asserts_err_msg("should not be holding the Heap_lock and " \ | |
478 "should not be at a safepoint")); \ | |
479 } while (0) | |
480 | |
2361 | 481 #define assert_at_safepoint(_should_be_vm_thread_) \ |
1973 | 482 do { \ |
2152 | 483 assert(SafepointSynchronize::is_at_safepoint() && \ |
2361 | 484 ((_should_be_vm_thread_) == Thread::current()->is_VM_thread()), \ |
1973 | 485 heap_locking_asserts_err_msg("should be at a safepoint")); \ |
486 } while (0) | |
487 | |
488 #define assert_not_at_safepoint() \ | |
489 do { \ | |
490 assert(!SafepointSynchronize::is_at_safepoint(), \ | |
491 heap_locking_asserts_err_msg("should not be at a safepoint")); \ | |
492 } while (0) | |
493 | |
342 | 494 protected: |
495 | |
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496 // The young region list. |
342 | 497 YoungList* _young_list; |
498 | |
499 // The current policy object for the collector. | |
500 G1CollectorPolicy* _g1_policy; | |
501 | |
2152 | 502 // This is the second level of trying to allocate a new region. If |
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503 // new_region() didn't find a region on the free_list, this call will |
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504 // check whether there's anything available on the |
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505 // secondary_free_list and/or wait for more regions to appear on |
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506 // that list, if _free_regions_coming is set. |
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507 HeapRegion* new_region_try_secondary_free_list(bool is_old); |
342 | 508 |
2361 | 509 // Try to allocate a single non-humongous HeapRegion sufficient for |
510 // an allocation of the given word_size. If do_expand is true, | |
511 // attempt to expand the heap if necessary to satisfy the allocation | |
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512 // request. If the region is to be used as an old region or for a |
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513 // humongous object, set is_old to true. If not, to false. |
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514 HeapRegion* new_region(size_t word_size, bool is_old, bool do_expand); |
342 | 515 |
2361 | 516 // Attempt to satisfy a humongous allocation request of the given |
517 // size by finding a contiguous set of free regions of num_regions | |
518 // length and remove them from the master free list. Return the | |
3766 | 519 // index of the first region or G1_NULL_HRS_INDEX if the search |
520 // was unsuccessful. | |
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521 uint humongous_obj_allocate_find_first(uint num_regions, |
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522 size_t word_size); |
342 | 523 |
2361 | 524 // Initialize a contiguous set of free regions of length num_regions |
525 // and starting at index first so that they appear as a single | |
526 // humongous region. | |
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527 HeapWord* humongous_obj_allocate_initialize_regions(uint first, |
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528 uint num_regions, |
2361 | 529 size_t word_size); |
530 | |
531 // Attempt to allocate a humongous object of the given size. Return | |
532 // NULL if unsuccessful. | |
2152 | 533 HeapWord* humongous_obj_allocate(size_t word_size); |
1973 | 534 |
535 // The following two methods, allocate_new_tlab() and | |
536 // mem_allocate(), are the two main entry points from the runtime | |
537 // into the G1's allocation routines. They have the following | |
538 // assumptions: | |
539 // | |
540 // * They should both be called outside safepoints. | |
541 // | |
542 // * They should both be called without holding the Heap_lock. | |
543 // | |
544 // * All allocation requests for new TLABs should go to | |
545 // allocate_new_tlab(). | |
546 // | |
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547 // * All non-TLAB allocation requests should go to mem_allocate(). |
1973 | 548 // |
549 // * If either call cannot satisfy the allocation request using the | |
550 // current allocating region, they will try to get a new one. If | |
551 // this fails, they will attempt to do an evacuation pause and | |
552 // retry the allocation. | |
553 // | |
554 // * If all allocation attempts fail, even after trying to schedule | |
555 // an evacuation pause, allocate_new_tlab() will return NULL, | |
556 // whereas mem_allocate() will attempt a heap expansion and/or | |
557 // schedule a Full GC. | |
558 // | |
559 // * We do not allow humongous-sized TLABs. So, allocate_new_tlab | |
560 // should never be called with word_size being humongous. All | |
561 // humongous allocation requests should go to mem_allocate() which | |
562 // will satisfy them with a special path. | |
563 | |
564 virtual HeapWord* allocate_new_tlab(size_t word_size); | |
565 | |
566 virtual HeapWord* mem_allocate(size_t word_size, | |
567 bool* gc_overhead_limit_was_exceeded); | |
342 | 568 |
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569 // The following three methods take a gc_count_before_ret |
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570 // parameter which is used to return the GC count if the method |
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571 // returns NULL. Given that we are required to read the GC count |
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572 // while holding the Heap_lock, and these paths will take the |
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573 // Heap_lock at some point, it's easier to get them to read the GC |
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574 // count while holding the Heap_lock before they return NULL instead |
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575 // of the caller (namely: mem_allocate()) having to also take the |
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576 // Heap_lock just to read the GC count. |
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577 |
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578 // First-level mutator allocation attempt: try to allocate out of |
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579 // the mutator alloc region without taking the Heap_lock. This |
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580 // should only be used for non-humongous allocations. |
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581 inline HeapWord* attempt_allocation(size_t word_size, |
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582 unsigned int* gc_count_before_ret, |
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583 int* gclocker_retry_count_ret); |
342 | 584 |
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585 // Second-level mutator allocation attempt: take the Heap_lock and |
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586 // retry the allocation attempt, potentially scheduling a GC |
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587 // pause. This should only be used for non-humongous allocations. |
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588 HeapWord* attempt_allocation_slow(size_t word_size, |
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589 unsigned int* gc_count_before_ret, |
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590 int* gclocker_retry_count_ret); |
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591 |
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592 // Takes the Heap_lock and attempts a humongous allocation. It can |
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593 // potentially schedule a GC pause. |
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594 HeapWord* attempt_allocation_humongous(size_t word_size, |
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595 unsigned int* gc_count_before_ret, |
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596 int* gclocker_retry_count_ret); |
1973 | 597 |
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598 // Allocation attempt that should be called during safepoints (e.g., |
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599 // at the end of a successful GC). expect_null_mutator_alloc_region |
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600 // specifies whether the mutator alloc region is expected to be NULL |
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601 // or not. |
1973 | 602 HeapWord* attempt_allocation_at_safepoint(size_t word_size, |
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603 bool expect_null_mutator_alloc_region); |
1973 | 604 |
605 // It dirties the cards that cover the block so that so that the post | |
606 // write barrier never queues anything when updating objects on this | |
607 // block. It is assumed (and in fact we assert) that the block | |
608 // belongs to a young region. | |
609 inline void dirty_young_block(HeapWord* start, size_t word_size); | |
342 | 610 |
611 // Allocate blocks during garbage collection. Will ensure an | |
612 // allocation region, either by picking one or expanding the | |
613 // heap, and then allocate a block of the given size. The block | |
614 // may not be a humongous - it must fit into a single heap region. | |
615 HeapWord* par_allocate_during_gc(GCAllocPurpose purpose, size_t word_size); | |
616 | |
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617 HeapWord* allocate_during_gc_slow(GCAllocPurpose purpose, |
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618 HeapRegion* alloc_region, |
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619 bool par, |
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620 size_t word_size); |
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621 |
342 | 622 // Ensure that no further allocations can happen in "r", bearing in mind |
623 // that parallel threads might be attempting allocations. | |
624 void par_allocate_remaining_space(HeapRegion* r); | |
625 | |
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626 // Allocation attempt during GC for a survivor object / PLAB. |
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627 inline HeapWord* survivor_attempt_allocation(size_t word_size); |
545 | 628 |
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629 // Allocation attempt during GC for an old object / PLAB. |
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630 inline HeapWord* old_attempt_allocation(size_t word_size); |
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631 |
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632 // These methods are the "callbacks" from the G1AllocRegion class. |
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633 |
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634 // For mutator alloc regions. |
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635 HeapRegion* new_mutator_alloc_region(size_t word_size, bool force); |
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636 void retire_mutator_alloc_region(HeapRegion* alloc_region, |
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637 size_t allocated_bytes); |
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638 |
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639 // For GC alloc regions. |
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640 HeapRegion* new_gc_alloc_region(size_t word_size, uint count, |
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641 GCAllocPurpose ap); |
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642 void retire_gc_alloc_region(HeapRegion* alloc_region, |
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643 size_t allocated_bytes, GCAllocPurpose ap); |
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644 |
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645 // - if explicit_gc is true, the GC is for a System.gc() or a heap |
1973 | 646 // inspection request and should collect the entire heap |
647 // - if clear_all_soft_refs is true, all soft references should be | |
648 // cleared during the GC | |
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649 // - if explicit_gc is false, word_size describes the allocation that |
1973 | 650 // the GC should attempt (at least) to satisfy |
651 // - it returns false if it is unable to do the collection due to the | |
652 // GC locker being active, true otherwise | |
653 bool do_collection(bool explicit_gc, | |
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654 bool clear_all_soft_refs, |
342 | 655 size_t word_size); |
656 | |
657 // Callback from VM_G1CollectFull operation. | |
658 // Perform a full collection. | |
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659 virtual void do_full_collection(bool clear_all_soft_refs); |
342 | 660 |
661 // Resize the heap if necessary after a full collection. If this is | |
662 // after a collect-for allocation, "word_size" is the allocation size, | |
663 // and will be considered part of the used portion of the heap. | |
664 void resize_if_necessary_after_full_collection(size_t word_size); | |
665 | |
666 // Callback from VM_G1CollectForAllocation operation. | |
667 // This function does everything necessary/possible to satisfy a | |
668 // failed allocation request (including collection, expansion, etc.) | |
1973 | 669 HeapWord* satisfy_failed_allocation(size_t word_size, bool* succeeded); |
342 | 670 |
671 // Attempting to expand the heap sufficiently | |
672 // to support an allocation of the given "word_size". If | |
673 // successful, perform the allocation and return the address of the | |
674 // allocated block, or else "NULL". | |
1973 | 675 HeapWord* expand_and_allocate(size_t word_size); |
342 | 676 |
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677 // Process any reference objects discovered during |
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678 // an incremental evacuation pause. |
6819 | 679 void process_discovered_references(uint no_of_gc_workers); |
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680 |
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681 // Enqueue any remaining discovered references |
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682 // after processing. |
6819 | 683 void enqueue_discovered_references(uint no_of_gc_workers); |
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684 |
342 | 685 public: |
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686 |
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687 G1MonitoringSupport* g1mm() { |
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688 assert(_g1mm != NULL, "should have been initialized"); |
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689 return _g1mm; |
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690 } |
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691 |
342 | 692 // Expand the garbage-first heap by at least the given size (in bytes!). |
2188
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693 // Returns true if the heap was expanded by the requested amount; |
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694 // false otherwise. |
342 | 695 // (Rounds up to a HeapRegion boundary.) |
2188
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696 bool expand(size_t expand_bytes); |
342 | 697 |
698 // Do anything common to GC's. | |
699 virtual void gc_prologue(bool full); | |
700 virtual void gc_epilogue(bool full); | |
701 | |
526 | 702 // We register a region with the fast "in collection set" test. We |
703 // simply set to true the array slot corresponding to this region. | |
704 void register_region_with_in_cset_fast_test(HeapRegion* r) { | |
705 assert(_in_cset_fast_test_base != NULL, "sanity"); | |
706 assert(r->in_collection_set(), "invariant"); | |
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707 uint index = r->hrs_index(); |
3766 | 708 assert(index < _in_cset_fast_test_length, "invariant"); |
526 | 709 assert(!_in_cset_fast_test_base[index], "invariant"); |
710 _in_cset_fast_test_base[index] = true; | |
711 } | |
712 | |
713 // This is a fast test on whether a reference points into the | |
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714 // collection set or not. Assume that the reference |
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715 // points into the heap. |
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716 inline bool in_cset_fast_test(oop obj); |
526 | 717 |
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718 void clear_cset_fast_test() { |
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719 assert(_in_cset_fast_test_base != NULL, "sanity"); |
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720 memset(_in_cset_fast_test_base, false, |
6010
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721 (size_t) _in_cset_fast_test_length * sizeof(bool)); |
1394
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722 } |
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723 |
6120
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724 // This is called at the start of either a concurrent cycle or a Full |
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725 // GC to update the number of old marking cycles started. |
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726 void increment_old_marking_cycles_started(); |
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727 |
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728 // This is called at the end of either a concurrent cycle or a Full |
6120
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729 // GC to update the number of old marking cycles completed. Those two |
1656
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730 // can happen in a nested fashion, i.e., we start a concurrent |
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731 // cycle, a Full GC happens half-way through it which ends first, |
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732 // and then the cycle notices that a Full GC happened and ends |
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733 // too. The concurrent parameter is a boolean to help us do a bit |
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734 // tighter consistency checking in the method. If concurrent is |
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735 // false, the caller is the inner caller in the nesting (i.e., the |
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736 // Full GC). If concurrent is true, the caller is the outer caller |
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737 // in this nesting (i.e., the concurrent cycle). Further nesting is |
6120
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|
738 // not currently supported. The end of this call also notifies |
2030
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739 // the FullGCCount_lock in case a Java thread is waiting for a full |
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740 // GC to happen (e.g., it called System.gc() with |
1656
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741 // +ExplicitGCInvokesConcurrent). |
6120
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742 void increment_old_marking_cycles_completed(bool concurrent); |
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743 |
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744 unsigned int old_marking_cycles_completed() { |
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745 return _old_marking_cycles_completed; |
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746 } |
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747 |
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748 void register_concurrent_cycle_start(const Ticks& start_time); |
10405 | 749 void register_concurrent_cycle_end(); |
750 void trace_heap_after_concurrent_cycle(); | |
751 | |
752 G1YCType yc_type(); | |
753 | |
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754 G1HRPrinter* hr_printer() { return &_hr_printer; } |
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755 |
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756 // Frees a non-humongous region by initializing its contents and |
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757 // adding it to the free list that's passed as a parameter (this is |
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758 // usually a local list which will be appended to the master free |
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759 // list later). The used bytes of freed regions are accumulated in |
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760 // pre_used. If par is true, the region's RSet will not be freed |
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761 // up. The assumption is that this will be done later. |
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762 // The locked parameter indicates if the caller has already taken |
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763 // care of proper synchronization. This may allow some optimizations. |
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764 void free_region(HeapRegion* hr, |
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765 FreeRegionList* free_list, |
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766 bool par, |
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767 bool locked = false); |
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768 |
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769 // Frees a humongous region by collapsing it into individual regions |
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770 // and calling free_region() for each of them. The freed regions |
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771 // will be added to the free list that's passed as a parameter (this |
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772 // is usually a local list which will be appended to the master free |
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773 // list later). The used bytes of freed regions are accumulated in |
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774 // pre_used. If par is true, the region's RSet will not be freed |
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775 // up. The assumption is that this will be done later. |
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776 void free_humongous_region(HeapRegion* hr, |
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777 FreeRegionList* free_list, |
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778 bool par); |
342 | 779 protected: |
780 | |
781 // Shrink the garbage-first heap by at most the given size (in bytes!). | |
782 // (Rounds down to a HeapRegion boundary.) | |
783 virtual void shrink(size_t expand_bytes); | |
784 void shrink_helper(size_t expand_bytes); | |
785 | |
1709 | 786 #if TASKQUEUE_STATS |
787 static void print_taskqueue_stats_hdr(outputStream* const st = gclog_or_tty); | |
788 void print_taskqueue_stats(outputStream* const st = gclog_or_tty) const; | |
789 void reset_taskqueue_stats(); | |
790 #endif // TASKQUEUE_STATS | |
791 | |
1973 | 792 // Schedule the VM operation that will do an evacuation pause to |
793 // satisfy an allocation request of word_size. *succeeded will | |
794 // return whether the VM operation was successful (it did do an | |
795 // evacuation pause) or not (another thread beat us to it or the GC | |
796 // locker was active). Given that we should not be holding the | |
797 // Heap_lock when we enter this method, we will pass the | |
798 // gc_count_before (i.e., total_collections()) as a parameter since | |
799 // it has to be read while holding the Heap_lock. Currently, both | |
800 // methods that call do_collection_pause() release the Heap_lock | |
801 // before the call, so it's easy to read gc_count_before just before. | |
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802 HeapWord* do_collection_pause(size_t word_size, |
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803 unsigned int gc_count_before, |
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804 bool* succeeded, |
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805 GCCause::Cause gc_cause); |
342 | 806 |
807 // The guts of the incremental collection pause, executed by the vm | |
1973 | 808 // thread. It returns false if it is unable to do the collection due |
809 // to the GC locker being active, true otherwise | |
810 bool do_collection_pause_at_safepoint(double target_pause_time_ms); | |
342 | 811 |
812 // Actually do the work of evacuating the collection set. | |
10405 | 813 void evacuate_collection_set(EvacuationInfo& evacuation_info); |
342 | 814 |
815 // The g1 remembered set of the heap. | |
816 G1RemSet* _g1_rem_set; | |
817 | |
616
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818 // A set of cards that cover the objects for which the Rsets should be updated |
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819 // concurrently after the collection. |
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820 DirtyCardQueueSet _dirty_card_queue_set; |
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821 |
342 | 822 // The closure used to refine a single card. |
823 RefineCardTableEntryClosure* _refine_cte_cl; | |
824 | |
825 // A function to check the consistency of dirty card logs. | |
826 void check_ct_logs_at_safepoint(); | |
827 | |
1705 | 828 // A DirtyCardQueueSet that is used to hold cards that contain |
829 // references into the current collection set. This is used to | |
830 // update the remembered sets of the regions in the collection | |
831 // set in the event of an evacuation failure. | |
832 DirtyCardQueueSet _into_cset_dirty_card_queue_set; | |
833 | |
342 | 834 // After a collection pause, make the regions in the CS into free |
835 // regions. | |
10405 | 836 void free_collection_set(HeapRegion* cs_head, EvacuationInfo& evacuation_info); |
342 | 837 |
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838 // Abandon the current collection set without recording policy |
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839 // statistics or updating free lists. |
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840 void abandon_collection_set(HeapRegion* cs_head); |
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841 |
342 | 842 // Applies "scan_non_heap_roots" to roots outside the heap, |
843 // "scan_rs" to roots inside the heap (having done "set_region" to | |
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844 // indicate the region in which the root resides), |
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845 // and does "scan_metadata" If "scan_rs" is |
342 | 846 // NULL, then this step is skipped. The "worker_i" |
847 // param is for use with parallel roots processing, and should be | |
848 // the "i" of the calling parallel worker thread's work(i) function. | |
849 // In the sequential case this param will be ignored. | |
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850 void g1_process_strong_roots(bool is_scavenging, |
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851 ScanningOption so, |
342 | 852 OopClosure* scan_non_heap_roots, |
853 OopsInHeapRegionClosure* scan_rs, | |
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854 G1KlassScanClosure* scan_klasses, |
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855 uint worker_i); |
342 | 856 |
857 // Apply "blk" to all the weak roots of the system. These include | |
858 // JNI weak roots, the code cache, system dictionary, symbol table, | |
859 // string table, and referents of reachable weak refs. | |
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860 void g1_process_weak_roots(OopClosure* root_closure); |
342 | 861 |
3766 | 862 // Notifies all the necessary spaces that the committed space has |
863 // been updated (either expanded or shrunk). It should be called | |
864 // after _g1_storage is updated. | |
865 void update_committed_space(HeapWord* old_end, HeapWord* new_end); | |
866 | |
342 | 867 // The concurrent marker (and the thread it runs in.) |
868 ConcurrentMark* _cm; | |
869 ConcurrentMarkThread* _cmThread; | |
870 bool _mark_in_progress; | |
871 | |
872 // The concurrent refiner. | |
873 ConcurrentG1Refine* _cg1r; | |
874 | |
875 // The parallel task queues | |
876 RefToScanQueueSet *_task_queues; | |
877 | |
878 // True iff a evacuation has failed in the current collection. | |
879 bool _evacuation_failed; | |
880 | |
10405 | 881 EvacuationFailedInfo* _evacuation_failed_info_array; |
342 | 882 |
883 // Failed evacuations cause some logical from-space objects to have | |
884 // forwarding pointers to themselves. Reset them. | |
885 void remove_self_forwarding_pointers(); | |
886 | |
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887 // Together, these store an object with a preserved mark, and its mark value. |
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888 Stack<oop, mtGC> _objs_with_preserved_marks; |
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889 Stack<markOop, mtGC> _preserved_marks_of_objs; |
342 | 890 |
891 // Preserve the mark of "obj", if necessary, in preparation for its mark | |
892 // word being overwritten with a self-forwarding-pointer. | |
893 void preserve_mark_if_necessary(oop obj, markOop m); | |
894 | |
895 // The stack of evac-failure objects left to be scanned. | |
896 GrowableArray<oop>* _evac_failure_scan_stack; | |
897 // The closure to apply to evac-failure objects. | |
898 | |
899 OopsInHeapRegionClosure* _evac_failure_closure; | |
900 // Set the field above. | |
901 void | |
902 set_evac_failure_closure(OopsInHeapRegionClosure* evac_failure_closure) { | |
903 _evac_failure_closure = evac_failure_closure; | |
904 } | |
905 | |
906 // Push "obj" on the scan stack. | |
907 void push_on_evac_failure_scan_stack(oop obj); | |
908 // Process scan stack entries until the stack is empty. | |
909 void drain_evac_failure_scan_stack(); | |
910 // True iff an invocation of "drain_scan_stack" is in progress; to | |
911 // prevent unnecessary recursion. | |
912 bool _drain_in_progress; | |
913 | |
914 // Do any necessary initialization for evacuation-failure handling. | |
915 // "cl" is the closure that will be used to process evac-failure | |
916 // objects. | |
917 void init_for_evac_failure(OopsInHeapRegionClosure* cl); | |
918 // Do any necessary cleanup for evacuation-failure handling data | |
919 // structures. | |
920 void finalize_for_evac_failure(); | |
921 | |
922 // An attempt to evacuate "obj" has failed; take necessary steps. | |
10405 | 923 oop handle_evacuation_failure_par(G1ParScanThreadState* _par_scan_state, oop obj); |
342 | 924 void handle_evacuation_failure_common(oop obj, markOop m); |
925 | |
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926 #ifndef PRODUCT |
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927 // Support for forcing evacuation failures. Analogous to |
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928 // PromotionFailureALot for the other collectors. |
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929 |
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930 // Records whether G1EvacuationFailureALot should be in effect |
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931 // for the current GC |
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932 bool _evacuation_failure_alot_for_current_gc; |
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933 |
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934 // Used to record the GC number for interval checking when |
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935 // determining whether G1EvaucationFailureALot is in effect |
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936 // for the current GC. |
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937 size_t _evacuation_failure_alot_gc_number; |
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938 |
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939 // Count of the number of evacuations between failures. |
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940 volatile size_t _evacuation_failure_alot_count; |
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941 |
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942 // Set whether G1EvacuationFailureALot should be in effect |
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943 // for the current GC (based upon the type of GC and which |
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944 // command line flags are set); |
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945 inline bool evacuation_failure_alot_for_gc_type(bool gcs_are_young, |
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946 bool during_initial_mark, |
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947 bool during_marking); |
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948 |
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949 inline void set_evacuation_failure_alot_for_current_gc(); |
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950 |
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951 // Return true if it's time to cause an evacuation failure. |
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952 inline bool evacuation_should_fail(); |
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953 |
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954 // Reset the G1EvacuationFailureALot counters. Should be called at |
10405 | 955 // the end of an evacuation pause in which an evacuation failure occurred. |
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956 inline void reset_evacuation_should_fail(); |
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957 #endif // !PRODUCT |
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958 |
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959 // ("Weak") Reference processing support. |
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960 // |
10405 | 961 // G1 has 2 instances of the reference processor class. One |
3979
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962 // (_ref_processor_cm) handles reference object discovery |
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963 // and subsequent processing during concurrent marking cycles. |
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964 // |
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965 // The other (_ref_processor_stw) handles reference object |
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966 // discovery and processing during full GCs and incremental |
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967 // evacuation pauses. |
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968 // |
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969 // During an incremental pause, reference discovery will be |
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970 // temporarily disabled for _ref_processor_cm and will be |
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971 // enabled for _ref_processor_stw. At the end of the evacuation |
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972 // pause references discovered by _ref_processor_stw will be |
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973 // processed and discovery will be disabled. The previous |
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974 // setting for reference object discovery for _ref_processor_cm |
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975 // will be re-instated. |
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976 // |
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977 // At the start of marking: |
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978 // * Discovery by the CM ref processor is verified to be inactive |
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979 // and it's discovered lists are empty. |
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980 // * Discovery by the CM ref processor is then enabled. |
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981 // |
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982 // At the end of marking: |
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983 // * Any references on the CM ref processor's discovered |
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984 // lists are processed (possibly MT). |
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985 // |
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986 // At the start of full GC we: |
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987 // * Disable discovery by the CM ref processor and |
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988 // empty CM ref processor's discovered lists |
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989 // (without processing any entries). |
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990 // * Verify that the STW ref processor is inactive and it's |
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991 // discovered lists are empty. |
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992 // * Temporarily set STW ref processor discovery as single threaded. |
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993 // * Temporarily clear the STW ref processor's _is_alive_non_header |
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994 // field. |
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995 // * Finally enable discovery by the STW ref processor. |
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996 // |
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997 // The STW ref processor is used to record any discovered |
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998 // references during the full GC. |
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999 // |
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1000 // At the end of a full GC we: |
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1001 // * Enqueue any reference objects discovered by the STW ref processor |
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1002 // that have non-live referents. This has the side-effect of |
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1003 // making the STW ref processor inactive by disabling discovery. |
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1004 // * Verify that the CM ref processor is still inactive |
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1005 // and no references have been placed on it's discovered |
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1006 // lists (also checked as a precondition during initial marking). |
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1007 |
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1008 // The (stw) reference processor... |
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1009 ReferenceProcessor* _ref_processor_stw; |
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1010 |
10405 | 1011 STWGCTimer* _gc_timer_stw; |
1012 ConcurrentGCTimer* _gc_timer_cm; | |
1013 | |
1014 G1OldTracer* _gc_tracer_cm; | |
1015 G1NewTracer* _gc_tracer_stw; | |
1016 | |
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1017 // During reference object discovery, the _is_alive_non_header |
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1018 // closure (if non-null) is applied to the referent object to |
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1019 // determine whether the referent is live. If so then the |
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1020 // reference object does not need to be 'discovered' and can |
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1021 // be treated as a regular oop. This has the benefit of reducing |
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1022 // the number of 'discovered' reference objects that need to |
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1023 // be processed. |
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1024 // |
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1025 // Instance of the is_alive closure for embedding into the |
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1026 // STW reference processor as the _is_alive_non_header field. |
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1027 // Supplying a value for the _is_alive_non_header field is |
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1028 // optional but doing so prevents unnecessary additions to |
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1029 // the discovered lists during reference discovery. |
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1030 G1STWIsAliveClosure _is_alive_closure_stw; |
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1031 |
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1032 // The (concurrent marking) reference processor... |
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1033 ReferenceProcessor* _ref_processor_cm; |
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1034 |
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1035 // Instance of the concurrent mark is_alive closure for embedding |
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1036 // into the Concurrent Marking reference processor as the |
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1037 // _is_alive_non_header field. Supplying a value for the |
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1038 // _is_alive_non_header field is optional but doing so prevents |
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1039 // unnecessary additions to the discovered lists during reference |
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1040 // discovery. |
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1041 G1CMIsAliveClosure _is_alive_closure_cm; |
342 | 1042 |
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1043 // Cache used by G1CollectedHeap::start_cset_region_for_worker(). |
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1044 HeapRegion** _worker_cset_start_region; |
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1045 |
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1046 // Time stamp to validate the regions recorded in the cache |
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1047 // used by G1CollectedHeap::start_cset_region_for_worker(). |
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1048 // The heap region entry for a given worker is valid iff |
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1049 // the associated time stamp value matches the current value |
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1050 // of G1CollectedHeap::_gc_time_stamp. |
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1051 unsigned int* _worker_cset_start_region_time_stamp; |
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1052 |
342 | 1053 enum G1H_process_strong_roots_tasks { |
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1054 G1H_PS_filter_satb_buffers, |
342 | 1055 G1H_PS_refProcessor_oops_do, |
1056 // Leave this one last. | |
1057 G1H_PS_NumElements | |
1058 }; | |
1059 | |
1060 SubTasksDone* _process_strong_tasks; | |
1061 | |
2152 | 1062 volatile bool _free_regions_coming; |
342 | 1063 |
1064 public: | |
1833
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1065 |
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1066 SubTasksDone* process_strong_tasks() { return _process_strong_tasks; } |
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1067 |
342 | 1068 void set_refine_cte_cl_concurrency(bool concurrent); |
1069 | |
1709 | 1070 RefToScanQueue *task_queue(int i) const; |
342 | 1071 |
616
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1072 // A set of cards where updates happened during the GC |
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1073 DirtyCardQueueSet& dirty_card_queue_set() { return _dirty_card_queue_set; } |
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1074 |
1705 | 1075 // A DirtyCardQueueSet that is used to hold cards that contain |
1076 // references into the current collection set. This is used to | |
1077 // update the remembered sets of the regions in the collection | |
1078 // set in the event of an evacuation failure. | |
1079 DirtyCardQueueSet& into_cset_dirty_card_queue_set() | |
1080 { return _into_cset_dirty_card_queue_set; } | |
1081 | |
342 | 1082 // Create a G1CollectedHeap with the specified policy. |
1083 // Must call the initialize method afterwards. | |
1084 // May not return if something goes wrong. | |
1085 G1CollectedHeap(G1CollectorPolicy* policy); | |
1086 | |
1087 // Initialize the G1CollectedHeap to have the initial and | |
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1088 // maximum sizes and remembered and barrier sets |
342 | 1089 // specified by the policy object. |
1090 jint initialize(); | |
1091 | |
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1092 virtual void stop(); |
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1093 |
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1094 // Return the (conservative) maximum heap alignment for any G1 heap |
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1095 static size_t conservative_max_heap_alignment(); |
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1096 |
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1097 // Initialize weak reference processing. |
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1098 virtual void ref_processing_init(); |
342 | 1099 |
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1100 void set_par_threads(uint t) { |
342 | 1101 SharedHeap::set_par_threads(t); |
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1102 // Done in SharedHeap but oddly there are |
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1103 // two _process_strong_tasks's in a G1CollectedHeap |
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1104 // so do it here too. |
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1105 _process_strong_tasks->set_n_threads(t); |
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1106 } |
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1107 |
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1108 // Set _n_par_threads according to a policy TBD. |
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1109 void set_par_threads(); |
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1110 |
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1111 void set_n_termination(int t) { |
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1112 _process_strong_tasks->set_n_threads(t); |
342 | 1113 } |
1114 | |
1115 virtual CollectedHeap::Name kind() const { | |
1116 return CollectedHeap::G1CollectedHeap; | |
1117 } | |
1118 | |
1119 // The current policy object for the collector. | |
1120 G1CollectorPolicy* g1_policy() const { return _g1_policy; } | |
1121 | |
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1122 virtual CollectorPolicy* collector_policy() const { return (CollectorPolicy*) g1_policy(); } |
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1123 |
342 | 1124 // Adaptive size policy. No such thing for g1. |
1125 virtual AdaptiveSizePolicy* size_policy() { return NULL; } | |
1126 | |
1127 // The rem set and barrier set. | |
1128 G1RemSet* g1_rem_set() const { return _g1_rem_set; } | |
1129 | |
1130 unsigned get_gc_time_stamp() { | |
1131 return _gc_time_stamp; | |
1132 } | |
1133 | |
1134 void reset_gc_time_stamp() { | |
1135 _gc_time_stamp = 0; | |
353
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1136 OrderAccess::fence(); |
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1137 // Clear the cached CSet starting regions and time stamps. |
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1138 // Their validity is dependent on the GC timestamp. |
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1139 clear_cset_start_regions(); |
353
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1140 } |
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1141 |
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1142 void check_gc_time_stamps() PRODUCT_RETURN; |
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1143 |
353
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1144 void increment_gc_time_stamp() { |
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1145 ++_gc_time_stamp; |
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1146 OrderAccess::fence(); |
342 | 1147 } |
1148 | |
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1149 // Reset the given region's GC timestamp. If it's starts humongous, |
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1150 // also reset the GC timestamp of its corresponding |
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1151 // continues humongous regions too. |
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1152 void reset_gc_time_stamps(HeapRegion* hr); |
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1153 |
1705 | 1154 void iterate_dirty_card_closure(CardTableEntryClosure* cl, |
1155 DirtyCardQueue* into_cset_dcq, | |
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1156 bool concurrent, uint worker_i); |
342 | 1157 |
1158 // The shared block offset table array. | |
1159 G1BlockOffsetSharedArray* bot_shared() const { return _bot_shared; } | |
1160 | |
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1161 // Reference Processing accessors |
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1162 |
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1163 // The STW reference processor.... |
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1164 ReferenceProcessor* ref_processor_stw() const { return _ref_processor_stw; } |
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1165 |
10405 | 1166 // The Concurrent Marking reference processor... |
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1167 ReferenceProcessor* ref_processor_cm() const { return _ref_processor_cm; } |
342 | 1168 |
10405 | 1169 ConcurrentGCTimer* gc_timer_cm() const { return _gc_timer_cm; } |
1170 G1OldTracer* gc_tracer_cm() const { return _gc_tracer_cm; } | |
1171 | |
342 | 1172 virtual size_t capacity() const; |
1173 virtual size_t used() const; | |
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1174 // This should be called when we're not holding the heap lock. The |
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1175 // result might be a bit inaccurate. |
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1176 size_t used_unlocked() const; |
342 | 1177 size_t recalculate_used() const; |
1178 | |
1179 // These virtual functions do the actual allocation. | |
1180 // Some heaps may offer a contiguous region for shared non-blocking | |
1181 // allocation, via inlined code (by exporting the address of the top and | |
1182 // end fields defining the extent of the contiguous allocation region.) | |
1183 // But G1CollectedHeap doesn't yet support this. | |
1184 | |
1185 // Return an estimate of the maximum allocation that could be performed | |
1186 // without triggering any collection or expansion activity. In a | |
1187 // generational collector, for example, this is probably the largest | |
1188 // allocation that could be supported (without expansion) in the youngest | |
1189 // generation. It is "unsafe" because no locks are taken; the result | |
1190 // should be treated as an approximation, not a guarantee, for use in | |
1191 // heuristic resizing decisions. | |
1192 virtual size_t unsafe_max_alloc(); | |
1193 | |
1194 virtual bool is_maximal_no_gc() const { | |
1195 return _g1_storage.uncommitted_size() == 0; | |
1196 } | |
1197 | |
1198 // The total number of regions in the heap. | |
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1199 uint n_regions() { return _hrs.length(); } |
3766 | 1200 |
1201 // The max number of regions in the heap. | |
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1202 uint max_regions() { return _hrs.max_length(); } |
342 | 1203 |
1204 // The number of regions that are completely free. | |
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1205 uint free_regions() { return _free_list.length(); } |
342 | 1206 |
1207 // The number of regions that are not completely free. | |
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1208 uint used_regions() { return n_regions() - free_regions(); } |
342 | 1209 |
1210 // The number of regions available for "regular" expansion. | |
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1211 uint expansion_regions() { return _expansion_regions; } |
342 | 1212 |
3766 | 1213 // Factory method for HeapRegion instances. It will return NULL if |
1214 // the allocation fails. | |
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1215 HeapRegion* new_heap_region(uint hrs_index, HeapWord* bottom); |
3766 | 1216 |
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1217 void verify_not_dirty_region(HeapRegion* hr) PRODUCT_RETURN; |
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1218 void verify_dirty_region(HeapRegion* hr) PRODUCT_RETURN; |
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1219 void verify_dirty_young_list(HeapRegion* head) PRODUCT_RETURN; |
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1220 void verify_dirty_young_regions() PRODUCT_RETURN; |
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1221 |
2152 | 1222 // verify_region_sets() performs verification over the region |
1223 // lists. It will be compiled in the product code to be used when | |
1224 // necessary (i.e., during heap verification). | |
1225 void verify_region_sets(); | |
342 | 1226 |
2152 | 1227 // verify_region_sets_optional() is planted in the code for |
1228 // list verification in non-product builds (and it can be enabled in | |
10405 | 1229 // product builds by defining HEAP_REGION_SET_FORCE_VERIFY to be 1). |
2152 | 1230 #if HEAP_REGION_SET_FORCE_VERIFY |
1231 void verify_region_sets_optional() { | |
1232 verify_region_sets(); | |
1233 } | |
1234 #else // HEAP_REGION_SET_FORCE_VERIFY | |
1235 void verify_region_sets_optional() { } | |
1236 #endif // HEAP_REGION_SET_FORCE_VERIFY | |
342 | 1237 |
2152 | 1238 #ifdef ASSERT |
2361 | 1239 bool is_on_master_free_list(HeapRegion* hr) { |
2152 | 1240 return hr->containing_set() == &_free_list; |
1241 } | |
1242 #endif // ASSERT | |
342 | 1243 |
2152 | 1244 // Wrapper for the region list operations that can be called from |
1245 // methods outside this class. | |
342 | 1246 |
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1247 void secondary_free_list_add(FreeRegionList* list) { |
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1248 _secondary_free_list.add_ordered(list); |
2152 | 1249 } |
342 | 1250 |
2152 | 1251 void append_secondary_free_list() { |
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1252 _free_list.add_ordered(&_secondary_free_list); |
2152 | 1253 } |
342 | 1254 |
2361 | 1255 void append_secondary_free_list_if_not_empty_with_lock() { |
1256 // If the secondary free list looks empty there's no reason to | |
1257 // take the lock and then try to append it. | |
2152 | 1258 if (!_secondary_free_list.is_empty()) { |
1259 MutexLockerEx x(SecondaryFreeList_lock, Mutex::_no_safepoint_check_flag); | |
1260 append_secondary_free_list(); | |
1261 } | |
1262 } | |
342 | 1263 |
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1264 inline void old_set_remove(HeapRegion* hr); |
4072 | 1265 |
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1266 size_t non_young_capacity_bytes() { |
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1267 return _old_set.total_capacity_bytes() + _humongous_set.total_capacity_bytes(); |
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1268 } |
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1269 |
2152 | 1270 void set_free_regions_coming(); |
1271 void reset_free_regions_coming(); | |
1272 bool free_regions_coming() { return _free_regions_coming; } | |
1273 void wait_while_free_regions_coming(); | |
342 | 1274 |
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1275 // Determine whether the given region is one that we are using as an |
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1276 // old GC alloc region. |
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1277 bool is_old_gc_alloc_region(HeapRegion* hr) { |
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1278 return hr == _retained_old_gc_alloc_region; |
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1279 } |
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1280 |
342 | 1281 // Perform a collection of the heap; intended for use in implementing |
1282 // "System.gc". This probably implies as full a collection as the | |
1283 // "CollectedHeap" supports. | |
1284 virtual void collect(GCCause::Cause cause); | |
1285 | |
1286 // The same as above but assume that the caller holds the Heap_lock. | |
1287 void collect_locked(GCCause::Cause cause); | |
1288 | |
10405 | 1289 // True iff an evacuation has failed in the most-recent collection. |
342 | 1290 bool evacuation_failed() { return _evacuation_failed; } |
1291 | |
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1292 void remove_from_old_sets(const HeapRegionSetCount& old_regions_removed, const HeapRegionSetCount& humongous_regions_removed); |
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1293 void prepend_to_freelist(FreeRegionList* list); |
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1294 void decrement_summary_bytes(size_t bytes); |
342 | 1295 |
4708 | 1296 // Returns "TRUE" iff "p" points into the committed areas of the heap. |
342 | 1297 virtual bool is_in(const void* p) const; |
1298 | |
1299 // Return "TRUE" iff the given object address is within the collection | |
1300 // set. | |
1301 inline bool obj_in_cs(oop obj); | |
1302 | |
1303 // Return "TRUE" iff the given object address is in the reserved | |
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1304 // region of g1. |
342 | 1305 bool is_in_g1_reserved(const void* p) const { |
1306 return _g1_reserved.contains(p); | |
1307 } | |
1308 | |
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1309 // Returns a MemRegion that corresponds to the space that has been |
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1310 // reserved for the heap |
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1311 MemRegion g1_reserved() { |
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1312 return _g1_reserved; |
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1313 } |
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1314 |
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1315 // Returns a MemRegion that corresponds to the space that has been |
342 | 1316 // committed in the heap |
1317 MemRegion g1_committed() { | |
1318 return _g1_committed; | |
1319 } | |
1320 | |
2311 | 1321 virtual bool is_in_closed_subset(const void* p) const; |
342 | 1322 |
12343 | 1323 G1SATBCardTableModRefBS* g1_barrier_set() { |
1324 return (G1SATBCardTableModRefBS*) barrier_set(); | |
1325 } | |
1326 | |
342 | 1327 // This resets the card table to all zeros. It is used after |
1328 // a collection pause which used the card table to claim cards. | |
1329 void cleanUpCardTable(); | |
1330 | |
1331 // Iteration functions. | |
1332 | |
1333 // Iterate over all the ref-containing fields of all objects, calling | |
1334 // "cl.do_oop" on each. | |
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1335 virtual void oop_iterate(ExtendedOopClosure* cl); |
342 | 1336 |
1337 // Same as above, restricted to a memory region. | |
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1338 void oop_iterate(MemRegion mr, ExtendedOopClosure* cl); |
342 | 1339 |
1340 // Iterate over all objects, calling "cl.do_object" on each. | |
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1341 virtual void object_iterate(ObjectClosure* cl); |
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1342 |
678 | 1343 virtual void safe_object_iterate(ObjectClosure* cl) { |
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1344 object_iterate(cl); |
678 | 1345 } |
342 | 1346 |
1347 // Iterate over all spaces in use in the heap, in ascending address order. | |
1348 virtual void space_iterate(SpaceClosure* cl); | |
1349 | |
1350 // Iterate over heap regions, in address order, terminating the | |
1351 // iteration early if the "doHeapRegion" method returns "true". | |
3766 | 1352 void heap_region_iterate(HeapRegionClosure* blk) const; |
342 | 1353 |
3766 | 1354 // Return the region with the given index. It assumes the index is valid. |
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1355 inline HeapRegion* region_at(uint index) const; |
342 | 1356 |
1357 // Divide the heap region sequence into "chunks" of some size (the number | |
1358 // of regions divided by the number of parallel threads times some | |
1359 // overpartition factor, currently 4). Assumes that this will be called | |
1360 // in parallel by ParallelGCThreads worker threads with discinct worker | |
1361 // ids in the range [0..max(ParallelGCThreads-1, 1)], that all parallel | |
1362 // calls will use the same "claim_value", and that that claim value is | |
1363 // different from the claim_value of any heap region before the start of | |
1364 // the iteration. Applies "blk->doHeapRegion" to each of the regions, by | |
1365 // attempting to claim the first region in each chunk, and, if | |
1366 // successful, applying the closure to each region in the chunk (and | |
1367 // setting the claim value of the second and subsequent regions of the | |
1368 // chunk.) For now requires that "doHeapRegion" always returns "false", | |
1369 // i.e., that a closure never attempt to abort a traversal. | |
1370 void heap_region_par_iterate_chunked(HeapRegionClosure* blk, | |
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1371 uint worker, |
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1372 uint no_of_par_workers, |
342 | 1373 jint claim_value); |
1374 | |
390 | 1375 // It resets all the region claim values to the default. |
1376 void reset_heap_region_claim_values(); | |
1377 | |
4783
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1378 // Resets the claim values of regions in the current |
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1379 // collection set to the default. |
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1380 void reset_cset_heap_region_claim_values(); |
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1381 |
355 | 1382 #ifdef ASSERT |
1383 bool check_heap_region_claim_values(jint claim_value); | |
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1384 |
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1385 // Same as the routine above but only checks regions in the |
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1386 // current collection set. |
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1387 bool check_cset_heap_region_claim_values(jint claim_value); |
355 | 1388 #endif // ASSERT |
1389 | |
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1390 // Clear the cached cset start regions and (more importantly) |
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1391 // the time stamps. Called when we reset the GC time stamp. |
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1392 void clear_cset_start_regions(); |
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1393 |
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1394 // Given the id of a worker, obtain or calculate a suitable |
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1395 // starting region for iterating over the current collection set. |
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1396 HeapRegion* start_cset_region_for_worker(uint worker_i); |
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1397 |
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1398 // This is a convenience method that is used by the |
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1399 // HeapRegionIterator classes to calculate the starting region for |
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1400 // each worker so that they do not all start from the same region. |
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1401 HeapRegion* start_region_for_worker(uint worker_i, uint no_of_par_workers); |
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1402 |
342 | 1403 // Iterate over the regions (if any) in the current collection set. |
1404 void collection_set_iterate(HeapRegionClosure* blk); | |
1405 | |
1406 // As above but starting from region r | |
1407 void collection_set_iterate_from(HeapRegion* r, HeapRegionClosure *blk); | |
1408 | |
1409 // Returns the first (lowest address) compactible space in the heap. | |
1410 virtual CompactibleSpace* first_compactible_space(); | |
1411 | |
1412 // A CollectedHeap will contain some number of spaces. This finds the | |
1413 // space containing a given address, or else returns NULL. | |
1414 virtual Space* space_containing(const void* addr) const; | |
1415 | |
1416 // A G1CollectedHeap will contain some number of heap regions. This | |
1417 // finds the region containing a given address, or else returns NULL. | |
3766 | 1418 template <class T> |
1419 inline HeapRegion* heap_region_containing(const T addr) const; | |
342 | 1420 |
1421 // Like the above, but requires "addr" to be in the heap (to avoid a | |
1422 // null-check), and unlike the above, may return an continuing humongous | |
1423 // region. | |
3766 | 1424 template <class T> |
1425 inline HeapRegion* heap_region_containing_raw(const T addr) const; | |
342 | 1426 |
1427 // A CollectedHeap is divided into a dense sequence of "blocks"; that is, | |
1428 // each address in the (reserved) heap is a member of exactly | |
1429 // one block. The defining characteristic of a block is that it is | |
1430 // possible to find its size, and thus to progress forward to the next | |
1431 // block. (Blocks may be of different sizes.) Thus, blocks may | |
1432 // represent Java objects, or they might be free blocks in a | |
1433 // free-list-based heap (or subheap), as long as the two kinds are | |
1434 // distinguishable and the size of each is determinable. | |
1435 | |
1436 // Returns the address of the start of the "block" that contains the | |
1437 // address "addr". We say "blocks" instead of "object" since some heaps | |
1438 // may not pack objects densely; a chunk may either be an object or a | |
1439 // non-object. | |
1440 virtual HeapWord* block_start(const void* addr) const; | |
1441 | |
1442 // Requires "addr" to be the start of a chunk, and returns its size. | |
1443 // "addr + size" is required to be the start of a new chunk, or the end | |
1444 // of the active area of the heap. | |
1445 virtual size_t block_size(const HeapWord* addr) const; | |
1446 | |
1447 // Requires "addr" to be the start of a block, and returns "TRUE" iff | |
1448 // the block is an object. | |
1449 virtual bool block_is_obj(const HeapWord* addr) const; | |
1450 | |
1451 // Does this heap support heap inspection? (+PrintClassHistogram) | |
1452 virtual bool supports_heap_inspection() const { return true; } | |
1453 | |
1454 // Section on thread-local allocation buffers (TLABs) | |
1455 // See CollectedHeap for semantics. | |
1456 | |
17727 | 1457 bool supports_tlab_allocation() const; |
1458 size_t tlab_capacity(Thread* ignored) const; | |
1459 size_t tlab_used(Thread* ignored) const; | |
1460 size_t max_tlab_size() const; | |
1461 size_t unsafe_max_tlab_alloc(Thread* ignored) const; | |
342 | 1462 |
1463 // Can a compiler initialize a new object without store barriers? | |
1464 // This permission only extends from the creation of a new object | |
1027
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1465 // via a TLAB up to the first subsequent safepoint. If such permission |
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1466 // is granted for this heap type, the compiler promises to call |
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1467 // defer_store_barrier() below on any slow path allocation of |
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1468 // a new object for which such initializing store barriers will |
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1469 // have been elided. G1, like CMS, allows this, but should be |
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1470 // ready to provide a compensating write barrier as necessary |
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1471 // if that storage came out of a non-young region. The efficiency |
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1472 // of this implementation depends crucially on being able to |
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1473 // answer very efficiently in constant time whether a piece of |
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1474 // storage in the heap comes from a young region or not. |
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1475 // See ReduceInitialCardMarks. |
342 | 1476 virtual bool can_elide_tlab_store_barriers() const { |
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1477 return true; |
1027
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1478 } |
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1479 |
1166 | 1480 virtual bool card_mark_must_follow_store() const { |
1481 return true; | |
1482 } | |
1483 | |
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1484 inline bool is_in_young(const oop obj); |
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1485 |
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1486 #ifdef ASSERT |
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1487 virtual bool is_in_partial_collection(const void* p); |
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1488 #endif |
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1489 |
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1490 virtual bool is_scavengable(const void* addr); |
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1491 |
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1492 // We don't need barriers for initializing stores to objects |
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1493 // in the young gen: for the SATB pre-barrier, there is no |
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1494 // pre-value that needs to be remembered; for the remembered-set |
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1495 // update logging post-barrier, we don't maintain remembered set |
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1496 // information for young gen objects. |
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1497 virtual inline bool can_elide_initializing_store_barrier(oop new_obj); |
342 | 1498 |
1499 // Returns "true" iff the given word_size is "very large". | |
1500 static bool isHumongous(size_t word_size) { | |
1313
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1501 // Note this has to be strictly greater-than as the TLABs |
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1502 // are capped at the humongous thresold and we want to |
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1503 // ensure that we don't try to allocate a TLAB as |
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1504 // humongous and that we don't allocate a humongous |
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1505 // object in a TLAB. |
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1506 return word_size > _humongous_object_threshold_in_words; |
342 | 1507 } |
1508 | |
1509 // Update mod union table with the set of dirty cards. | |
1510 void updateModUnion(); | |
1511 | |
1512 // Set the mod union bits corresponding to the given memRegion. Note | |
1513 // that this is always a safe operation, since it doesn't clear any | |
1514 // bits. | |
1515 void markModUnionRange(MemRegion mr); | |
1516 | |
1517 // Records the fact that a marking phase is no longer in progress. | |
1518 void set_marking_complete() { | |
1519 _mark_in_progress = false; | |
1520 } | |
1521 void set_marking_started() { | |
1522 _mark_in_progress = true; | |
1523 } | |
1524 bool mark_in_progress() { | |
1525 return _mark_in_progress; | |
1526 } | |
1527 | |
1528 // Print the maximum heap capacity. | |
1529 virtual size_t max_capacity() const; | |
1530 | |
1531 virtual jlong millis_since_last_gc(); | |
1532 | |
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1533 |
342 | 1534 // Convenience function to be used in situations where the heap type can be |
1535 // asserted to be this type. | |
1536 static G1CollectedHeap* heap(); | |
1537 | |
1538 void set_region_short_lived_locked(HeapRegion* hr); | |
1539 // add appropriate methods for any other surv rate groups | |
1540 | |
17727 | 1541 YoungList* young_list() const { return _young_list; } |
342 | 1542 |
1543 // debugging | |
1544 bool check_young_list_well_formed() { | |
1545 return _young_list->check_list_well_formed(); | |
1546 } | |
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1547 |
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1548 bool check_young_list_empty(bool check_heap, |
342 | 1549 bool check_sample = true); |
1550 | |
1551 // *** Stuff related to concurrent marking. It's not clear to me that so | |
1552 // many of these need to be public. | |
1553 | |
1554 // The functions below are helper functions that a subclass of | |
1555 // "CollectedHeap" can use in the implementation of its virtual | |
1556 // functions. | |
1557 // This performs a concurrent marking of the live objects in a | |
1558 // bitmap off to the side. | |
1559 void doConcurrentMark(); | |
1560 | |
1561 bool isMarkedPrev(oop obj) const; | |
1562 bool isMarkedNext(oop obj) const; | |
1563 | |
1564 // Determine if an object is dead, given the object and also | |
1565 // the region to which the object belongs. An object is dead | |
1566 // iff a) it was not allocated since the last mark and b) it | |
1567 // is not marked. | |
1568 | |
1569 bool is_obj_dead(const oop obj, const HeapRegion* hr) const { | |
1570 return | |
1571 !hr->obj_allocated_since_prev_marking(obj) && | |
1572 !isMarkedPrev(obj); | |
1573 } | |
1574 | |
1575 // This function returns true when an object has been | |
1576 // around since the previous marking and hasn't yet | |
1577 // been marked during this marking. | |
1578 | |
1579 bool is_obj_ill(const oop obj, const HeapRegion* hr) const { | |
1580 return | |
1581 !hr->obj_allocated_since_next_marking(obj) && | |
1582 !isMarkedNext(obj); | |
1583 } | |
1584 | |
1585 // Determine if an object is dead, given only the object itself. | |
1586 // This will find the region to which the object belongs and | |
1587 // then call the region version of the same function. | |
1588 | |
1589 // Added if it is NULL it isn't dead. | |
1590 | |
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1591 inline bool is_obj_dead(const oop obj) const; |
342 | 1592 |
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1593 inline bool is_obj_ill(const oop obj) const; |
342 | 1594 |
12080 | 1595 bool allocated_since_marking(oop obj, HeapRegion* hr, VerifyOption vo); |
1596 HeapWord* top_at_mark_start(HeapRegion* hr, VerifyOption vo); | |
1597 bool is_marked(oop obj, VerifyOption vo); | |
1598 const char* top_at_mark_start_str(VerifyOption vo); | |
1599 | |
1600 ConcurrentMark* concurrent_mark() const { return _cm; } | |
1601 | |
1602 // Refinement | |
1603 | |
1604 ConcurrentG1Refine* concurrent_g1_refine() const { return _cg1r; } | |
1605 | |
1606 // The dirty cards region list is used to record a subset of regions | |
1607 // whose cards need clearing. The list if populated during the | |
1608 // remembered set scanning and drained during the card table | |
1609 // cleanup. Although the methods are reentrant, population/draining | |
1610 // phases must not overlap. For synchronization purposes the last | |
1611 // element on the list points to itself. | |
1612 HeapRegion* _dirty_cards_region_list; | |
1613 void push_dirty_cards_region(HeapRegion* hr); | |
1614 HeapRegion* pop_dirty_cards_region(); | |
1615 | |
1616 // Optimized nmethod scanning support routines | |
1617 | |
1618 // Register the given nmethod with the G1 heap | |
1619 virtual void register_nmethod(nmethod* nm); | |
1620 | |
1621 // Unregister the given nmethod from the G1 heap | |
1622 virtual void unregister_nmethod(nmethod* nm); | |
1623 | |
1624 // Migrate the nmethods in the code root lists of the regions | |
1625 // in the collection set to regions in to-space. In the event | |
1626 // of an evacuation failure, nmethods that reference objects | |
1627 // that were not successfullly evacuated are not migrated. | |
1628 void migrate_strong_code_roots(); | |
1629 | |
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1630 // Free up superfluous code root memory. |
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1631 void purge_code_root_memory(); |
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1632 |
12080 | 1633 // During an initial mark pause, mark all the code roots that |
1634 // point into regions *not* in the collection set. | |
1635 void mark_strong_code_roots(uint worker_id); | |
1636 | |
1637 // Rebuild the stong code root lists for each region | |
1638 // after a full GC | |
1639 void rebuild_strong_code_roots(); | |
1640 | |
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1641 // Delete entries for dead interned string and clean up unreferenced symbols |
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1642 // in symbol table, possibly in parallel. |
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1643 void unlink_string_and_symbol_table(BoolObjectClosure* is_alive, bool unlink_strings = true, bool unlink_symbols = true); |
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1644 |
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1645 // Redirty logged cards in the refinement queue. |
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1646 void redirty_logged_cards(); |
12080 | 1647 // Verification |
1648 | |
1649 // The following is just to alert the verification code | |
1650 // that a full collection has occurred and that the | |
1651 // remembered sets are no longer up to date. | |
1652 bool _full_collection; | |
1653 void set_full_collection() { _full_collection = true;} | |
1654 void clear_full_collection() {_full_collection = false;} | |
1655 bool full_collection() {return _full_collection;} | |
1656 | |
1657 // Perform any cleanup actions necessary before allowing a verification. | |
1658 virtual void prepare_for_verify(); | |
1659 | |
1660 // Perform verification. | |
1661 | |
1662 // vo == UsePrevMarking -> use "prev" marking information, | |
1663 // vo == UseNextMarking -> use "next" marking information | |
1664 // vo == UseMarkWord -> use the mark word in the object header | |
1665 // | |
1666 // NOTE: Only the "prev" marking information is guaranteed to be | |
1667 // consistent most of the time, so most calls to this should use | |
1668 // vo == UsePrevMarking. | |
1669 // Currently, there is only one case where this is called with | |
1670 // vo == UseNextMarking, which is to verify the "next" marking | |
1671 // information at the end of remark. | |
1672 // Currently there is only one place where this is called with | |
1673 // vo == UseMarkWord, which is to verify the marking during a | |
1674 // full GC. | |
1675 void verify(bool silent, VerifyOption vo); | |
1676 | |
1677 // Override; it uses the "prev" marking information | |
1678 virtual void verify(bool silent); | |
1679 | |
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1680 // The methods below are here for convenience and dispatch the |
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1681 // appropriate method depending on value of the given VerifyOption |
12080 | 1682 // parameter. The values for that parameter, and their meanings, |
1683 // are the same as those above. | |
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1684 |
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1685 bool is_obj_dead_cond(const oop obj, |
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1686 const HeapRegion* hr, |
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1687 const VerifyOption vo) const; |
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1688 |
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1689 bool is_obj_dead_cond(const oop obj, |
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1690 const VerifyOption vo) const; |
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1691 |
12080 | 1692 // Printing |
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1693 |
12080 | 1694 virtual void print_on(outputStream* st) const; |
1695 virtual void print_extended_on(outputStream* st) const; | |
1696 virtual void print_on_error(outputStream* st) const; | |
342 | 1697 |
12080 | 1698 virtual void print_gc_threads_on(outputStream* st) const; |
1699 virtual void gc_threads_do(ThreadClosure* tc) const; | |
342 | 1700 |
12080 | 1701 // Override |
1702 void print_tracing_info() const; | |
1703 | |
1704 // The following two methods are helpful for debugging RSet issues. | |
1705 void print_cset_rsets() PRODUCT_RETURN; | |
1706 void print_all_rsets() PRODUCT_RETURN; | |
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1707 |
342 | 1708 public: |
1709 size_t pending_card_num(); | |
1710 size_t cards_scanned(); | |
1711 | |
1712 protected: | |
1713 size_t _max_heap_capacity; | |
1714 }; | |
1715 | |
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1716 class G1ParGCAllocBuffer: public ParGCAllocBuffer { |
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1717 private: |
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1718 bool _retired; |
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1719 |
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1720 public: |
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1721 G1ParGCAllocBuffer(size_t gclab_word_size); |
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1722 |
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1723 void set_buf(HeapWord* buf) { |
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1724 ParGCAllocBuffer::set_buf(buf); |
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1725 _retired = false; |
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1726 } |
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1727 |
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1728 void retire(bool end_of_gc, bool retain) { |
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1729 if (_retired) |
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1730 return; |
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1731 ParGCAllocBuffer::retire(end_of_gc, retain); |
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1732 _retired = true; |
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1733 } |
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1734 }; |
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1735 |
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1736 class G1ParScanThreadState : public StackObj { |
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1737 protected: |
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1738 G1CollectedHeap* _g1h; |
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1739 RefToScanQueue* _refs; |
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1740 DirtyCardQueue _dcq; |
12343 | 1741 G1SATBCardTableModRefBS* _ct_bs; |
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1742 G1RemSet* _g1_rem; |
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1743 |
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1744 G1ParGCAllocBuffer _surviving_alloc_buffer; |
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1745 G1ParGCAllocBuffer _tenured_alloc_buffer; |
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1746 G1ParGCAllocBuffer* _alloc_buffers[GCAllocPurposeCount]; |
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1747 ageTable _age_table; |
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1748 |
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1749 G1ParScanClosure _scanner; |
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1750 |
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1751 size_t _alloc_buffer_waste; |
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1752 size_t _undo_waste; |
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1753 |
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1754 OopsInHeapRegionClosure* _evac_failure_cl; |
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1755 |
10405 | 1756 int _hash_seed; |
4836
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1757 uint _queue_num; |
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1758 |
1611 | 1759 size_t _term_attempts; |
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1760 |
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1761 double _start; |
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1762 double _start_strong_roots; |
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1763 double _strong_roots_time; |
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1764 double _start_term; |
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1765 double _term_time; |
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1766 |
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1767 // Map from young-age-index (0 == not young, 1 is youngest) to |
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1768 // surviving words. base is what we get back from the malloc call |
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1769 size_t* _surviving_young_words_base; |
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1770 // this points into the array, as we use the first few entries for padding |
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1771 size_t* _surviving_young_words; |
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1772 |
1709 | 1773 #define PADDING_ELEM_NUM (DEFAULT_CACHE_LINE_SIZE / sizeof(size_t)) |
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1774 |
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1775 void add_to_alloc_buffer_waste(size_t waste) { _alloc_buffer_waste += waste; } |
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1776 |
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1777 void add_to_undo_waste(size_t waste) { _undo_waste += waste; } |
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1778 |
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1779 DirtyCardQueue& dirty_card_queue() { return _dcq; } |
12343 | 1780 G1SATBCardTableModRefBS* ctbs() { return _ct_bs; } |
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1781 |
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1782 template <class T> inline void immediate_rs_update(HeapRegion* from, T* p, int tid); |
845
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1783 |
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1784 template <class T> void deferred_rs_update(HeapRegion* from, T* p, int tid) { |
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1785 // If the new value of the field points to the same region or |
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1786 // is the to-space, we don't need to include it in the Rset updates. |
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1787 if (!from->is_in_reserved(oopDesc::load_decode_heap_oop(p)) && !from->is_survivor()) { |
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1788 size_t card_index = ctbs()->index_for(p); |
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1789 // If the card hasn't been added to the buffer, do it. |
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1790 if (ctbs()->mark_card_deferred(card_index)) { |
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1791 dirty_card_queue().enqueue((jbyte*)ctbs()->byte_for_index(card_index)); |
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1792 } |
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1793 } |
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1794 } |
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1795 |
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1796 public: |
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1797 G1ParScanThreadState(G1CollectedHeap* g1h, uint queue_num, ReferenceProcessor* rp); |
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1798 |
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1799 ~G1ParScanThreadState() { |
6197 | 1800 FREE_C_HEAP_ARRAY(size_t, _surviving_young_words_base, mtGC); |
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1801 } |
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1802 |
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1803 RefToScanQueue* refs() { return _refs; } |
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1804 ageTable* age_table() { return &_age_table; } |
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1805 |
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1806 G1ParGCAllocBuffer* alloc_buffer(GCAllocPurpose purpose) { |
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1807 return _alloc_buffers[purpose]; |
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1808 } |
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1809 |
1709 | 1810 size_t alloc_buffer_waste() const { return _alloc_buffer_waste; } |
1811 size_t undo_waste() const { return _undo_waste; } | |
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1812 |
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1813 #ifdef ASSERT |
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1814 bool verify_ref(narrowOop* ref) const; |
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1815 bool verify_ref(oop* ref) const; |
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1816 bool verify_task(StarTask ref) const; |
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1817 #endif // ASSERT |
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1818 |
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1819 template <class T> void push_on_queue(T* ref) { |
1862
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1820 assert(verify_ref(ref), "sanity"); |
1709 | 1821 refs()->push(ref); |
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1822 } |
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1823 |
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1824 template <class T> inline void update_rs(HeapRegion* from, T* p, int tid); |
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1825 |
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1826 HeapWord* allocate_slow(GCAllocPurpose purpose, size_t word_sz) { |
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1827 HeapWord* obj = NULL; |
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1828 size_t gclab_word_size = _g1h->desired_plab_sz(purpose); |
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1829 if (word_sz * 100 < gclab_word_size * ParallelGCBufferWastePct) { |
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1830 G1ParGCAllocBuffer* alloc_buf = alloc_buffer(purpose); |
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1831 add_to_alloc_buffer_waste(alloc_buf->words_remaining()); |
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1832 alloc_buf->retire(false /* end_of_gc */, false /* retain */); |
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1833 |
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1834 HeapWord* buf = _g1h->par_allocate_during_gc(purpose, gclab_word_size); |
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1835 if (buf == NULL) return NULL; // Let caller handle allocation failure. |
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1836 // Otherwise. |
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1837 alloc_buf->set_word_size(gclab_word_size); |
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1838 alloc_buf->set_buf(buf); |
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1839 |
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1840 obj = alloc_buf->allocate(word_sz); |
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1841 assert(obj != NULL, "buffer was definitely big enough..."); |
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1842 } else { |
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1843 obj = _g1h->par_allocate_during_gc(purpose, word_sz); |
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1844 } |
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1845 return obj; |
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1846 } |
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1847 |
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1848 HeapWord* allocate(GCAllocPurpose purpose, size_t word_sz) { |
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1849 HeapWord* obj = alloc_buffer(purpose)->allocate(word_sz); |
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1850 if (obj != NULL) return obj; |
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1851 return allocate_slow(purpose, word_sz); |
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1852 } |
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1853 |
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1854 void undo_allocation(GCAllocPurpose purpose, HeapWord* obj, size_t word_sz) { |
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1855 if (alloc_buffer(purpose)->contains(obj)) { |
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1856 assert(alloc_buffer(purpose)->contains(obj + word_sz - 1), |
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1857 "should contain whole object"); |
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1858 alloc_buffer(purpose)->undo_allocation(obj, word_sz); |
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1859 } else { |
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1860 CollectedHeap::fill_with_object(obj, word_sz); |
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1861 add_to_undo_waste(word_sz); |
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1862 } |
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1863 } |
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1864 |
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1865 void set_evac_failure_closure(OopsInHeapRegionClosure* evac_failure_cl) { |
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1866 _evac_failure_cl = evac_failure_cl; |
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1867 } |
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1868 OopsInHeapRegionClosure* evac_failure_closure() { |
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1869 return _evac_failure_cl; |
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1870 } |
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1871 |
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1872 int* hash_seed() { return &_hash_seed; } |
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1873 uint queue_num() { return _queue_num; } |
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1874 |
1709 | 1875 size_t term_attempts() const { return _term_attempts; } |
1611 | 1876 void note_term_attempt() { _term_attempts++; } |
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1877 |
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1878 void start_strong_roots() { |
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1879 _start_strong_roots = os::elapsedTime(); |
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1880 } |
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1881 void end_strong_roots() { |
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1882 _strong_roots_time += (os::elapsedTime() - _start_strong_roots); |
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1883 } |
1709 | 1884 double strong_roots_time() const { return _strong_roots_time; } |
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1885 |
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1886 void start_term_time() { |
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1887 note_term_attempt(); |
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1888 _start_term = os::elapsedTime(); |
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1889 } |
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1890 void end_term_time() { |
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1891 _term_time += (os::elapsedTime() - _start_term); |
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1892 } |
1709 | 1893 double term_time() const { return _term_time; } |
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1894 |
1709 | 1895 double elapsed_time() const { |
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1896 return os::elapsedTime() - _start; |
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1897 } |
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1898 |
1709 | 1899 static void |
1900 print_termination_stats_hdr(outputStream* const st = gclog_or_tty); | |
1901 void | |
1902 print_termination_stats(int i, outputStream* const st = gclog_or_tty) const; | |
1903 | |
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1904 size_t* surviving_young_words() { |
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1905 // We add on to hide entry 0 which accumulates surviving words for |
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1906 // age -1 regions (i.e. non-young ones) |
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1907 return _surviving_young_words; |
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1908 } |
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1909 |
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1910 void retire_alloc_buffers() { |
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1911 for (int ap = 0; ap < GCAllocPurposeCount; ++ap) { |
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1912 size_t waste = _alloc_buffers[ap]->words_remaining(); |
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1913 add_to_alloc_buffer_waste(waste); |
6595 | 1914 _alloc_buffers[ap]->flush_stats_and_retire(_g1h->stats_for_purpose((GCAllocPurpose)ap), |
1915 true /* end_of_gc */, | |
1916 false /* retain */); | |
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1917 } |
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1918 } |
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1919 private: |
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1920 #define G1_PARTIAL_ARRAY_MASK 0x2 |
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1921 |
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1922 inline bool has_partial_array_mask(oop* ref) const { |
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1923 return ((uintptr_t)ref & G1_PARTIAL_ARRAY_MASK) == G1_PARTIAL_ARRAY_MASK; |
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1924 } |
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1925 |
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1926 // We never encode partial array oops as narrowOop*, so return false immediately. |
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1927 // This allows the compiler to create optimized code when popping references from |
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1928 // the work queue. |
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1929 inline bool has_partial_array_mask(narrowOop* ref) const { |
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1930 assert(((uintptr_t)ref & G1_PARTIAL_ARRAY_MASK) != G1_PARTIAL_ARRAY_MASK, "Partial array oop reference encoded as narrowOop*"); |
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1931 return false; |
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1932 } |
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1933 |
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1934 // Only implement set_partial_array_mask() for regular oops, not for narrowOops. |
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1935 // We always encode partial arrays as regular oop, to allow the |
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1936 // specialization for has_partial_array_mask() for narrowOops above. |
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1937 // This means that unintentional use of this method with narrowOops are caught |
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1938 // by the compiler. |
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1939 inline oop* set_partial_array_mask(oop obj) const { |
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1940 assert(((uintptr_t)(void *)obj & G1_PARTIAL_ARRAY_MASK) == 0, "Information loss!"); |
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1941 return (oop*) ((uintptr_t)(void *)obj | G1_PARTIAL_ARRAY_MASK); |
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1942 } |
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1943 |
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1944 inline oop clear_partial_array_mask(oop* ref) const { |
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1945 return cast_to_oop((intptr_t)ref & ~G1_PARTIAL_ARRAY_MASK); |
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1946 } |
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1947 |
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1948 inline void do_oop_partial_array(oop* p); |
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1949 |
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1950 // This method is applied to the fields of the objects that have just been copied. |
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1951 template <class T> void do_oop_evac(T* p, HeapRegion* from) { |
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1952 assert(!oopDesc::is_null(oopDesc::load_decode_heap_oop(p)), |
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1953 "Reference should not be NULL here as such are never pushed to the task queue."); |
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1954 oop obj = oopDesc::load_decode_heap_oop_not_null(p); |
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1955 |
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1956 // Although we never intentionally push references outside of the collection |
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1957 // set, due to (benign) races in the claim mechanism during RSet scanning more |
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1958 // than one thread might claim the same card. So the same card may be |
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1959 // processed multiple times. So redo this check. |
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1960 if (_g1h->in_cset_fast_test(obj)) { |
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1961 oop forwardee; |
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1962 if (obj->is_forwarded()) { |
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1963 forwardee = obj->forwardee(); |
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1964 } else { |
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1965 forwardee = copy_to_survivor_space(obj); |
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1966 } |
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1967 assert(forwardee != NULL, "forwardee should not be NULL"); |
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1968 oopDesc::encode_store_heap_oop(p, forwardee); |
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1969 } |
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1970 |
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1971 assert(obj != NULL, "Must be"); |
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1972 update_rs(from, p, queue_num()); |
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1973 } |
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1974 public: |
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1975 |
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1976 oop copy_to_survivor_space(oop const obj); |
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1977 |
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1978 template <class T> inline void deal_with_reference(T* ref_to_scan); |
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1979 |
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1980 inline void deal_with_reference(StarTask ref); |
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1981 |
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1982 public: |
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1983 void trim_queue(); |
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1984 }; |
1972 | 1985 |
1986 #endif // SHARE_VM_GC_IMPLEMENTATION_G1_G1COLLECTEDHEAP_HPP |