Mercurial > hg > graal-jvmci-8
annotate src/share/vm/gc_implementation/g1/g1CollectedHeap.hpp @ 17690:e5c0b296deb2
8034948: Back out JDK-6976350 since it does not fix any issue
Summary: Revert JDK-6976350 because it does not improve PLAB fragmentation. To the contrary, it tends to increase the amount of wasted space with many threads.
Reviewed-by: brutisso
author | tschatzl |
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date | Wed, 26 Feb 2014 15:32:51 +0100 |
parents | 5d492d192cbf |
children | cfd4aac53239 |
rev | line source |
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342 | 1 /* |
10405 | 2 * Copyright (c) 2001, 2013, 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" |
2152 | 37 #include "gc_implementation/g1/heapRegionSets.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 |
12080 | 188 // The G1 STW is alive closure. |
189 // An instance is embedded into the G1CH and used as the | |
190 // (optional) _is_alive_non_header closure in the STW | |
191 // reference processor. It is also extensively used during | |
192 // reference processing during STW evacuation pauses. | |
193 class G1STWIsAliveClosure: public BoolObjectClosure { | |
194 G1CollectedHeap* _g1; | |
195 public: | |
196 G1STWIsAliveClosure(G1CollectedHeap* g1) : _g1(g1) {} | |
197 bool do_object_b(oop p); | |
198 }; | |
199 | |
342 | 200 class RefineCardTableEntryClosure; |
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201 |
342 | 202 class G1CollectedHeap : public SharedHeap { |
203 friend class VM_G1CollectForAllocation; | |
204 friend class VM_G1CollectFull; | |
205 friend class VM_G1IncCollectionPause; | |
206 friend class VMStructs; | |
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207 friend class MutatorAllocRegion; |
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208 friend class SurvivorGCAllocRegion; |
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209 friend class OldGCAllocRegion; |
342 | 210 |
211 // Closures used in implementation. | |
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212 template <G1Barrier barrier, bool do_mark_object> |
5987 | 213 friend class G1ParCopyClosure; |
342 | 214 friend class G1IsAliveClosure; |
215 friend class G1EvacuateFollowersClosure; | |
216 friend class G1ParScanThreadState; | |
217 friend class G1ParScanClosureSuper; | |
218 friend class G1ParEvacuateFollowersClosure; | |
219 friend class G1ParTask; | |
220 friend class G1FreeGarbageRegionClosure; | |
221 friend class RefineCardTableEntryClosure; | |
222 friend class G1PrepareCompactClosure; | |
223 friend class RegionSorter; | |
2152 | 224 friend class RegionResetter; |
342 | 225 friend class CountRCClosure; |
226 friend class EvacPopObjClosure; | |
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227 friend class G1ParCleanupCTTask; |
342 | 228 |
229 // Other related classes. | |
230 friend class G1MarkSweep; | |
231 | |
232 private: | |
233 // The one and only G1CollectedHeap, so static functions can find it. | |
234 static G1CollectedHeap* _g1h; | |
235 | |
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236 static size_t _humongous_object_threshold_in_words; |
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237 |
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238 // Storage for the G1 heap. |
342 | 239 VirtualSpace _g1_storage; |
240 MemRegion _g1_reserved; | |
241 | |
242 // The part of _g1_storage that is currently committed. | |
243 MemRegion _g1_committed; | |
244 | |
2152 | 245 // The master free list. It will satisfy all new region allocations. |
246 MasterFreeRegionList _free_list; | |
247 | |
248 // The secondary free list which contains regions that have been | |
249 // freed up during the cleanup process. This will be appended to the | |
250 // master free list when appropriate. | |
251 SecondaryFreeRegionList _secondary_free_list; | |
252 | |
4072 | 253 // It keeps track of the old regions. |
254 MasterOldRegionSet _old_set; | |
255 | |
2152 | 256 // It keeps track of the humongous regions. |
257 MasterHumongousRegionSet _humongous_set; | |
342 | 258 |
259 // The number of regions we could create by expansion. | |
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260 uint _expansion_regions; |
342 | 261 |
262 // The block offset table for the G1 heap. | |
263 G1BlockOffsetSharedArray* _bot_shared; | |
264 | |
4072 | 265 // Tears down the region sets / lists so that they are empty and the |
266 // regions on the heap do not belong to a region set / list. The | |
267 // only exception is the humongous set which we leave unaltered. If | |
268 // free_list_only is true, it will only tear down the master free | |
269 // list. It is called before a Full GC (free_list_only == false) or | |
270 // before heap shrinking (free_list_only == true). | |
271 void tear_down_region_sets(bool free_list_only); | |
272 | |
273 // Rebuilds the region sets / lists so that they are repopulated to | |
274 // reflect the contents of the heap. The only exception is the | |
275 // humongous set which was not torn down in the first place. If | |
276 // free_list_only is true, it will only rebuild the master free | |
277 // list. It is called after a Full GC (free_list_only == false) or | |
278 // after heap shrinking (free_list_only == true). | |
279 void rebuild_region_sets(bool free_list_only); | |
342 | 280 |
281 // The sequence of all heap regions in the heap. | |
3766 | 282 HeapRegionSeq _hrs; |
342 | 283 |
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284 // Alloc region used to satisfy mutator allocation requests. |
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285 MutatorAllocRegion _mutator_alloc_region; |
342 | 286 |
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287 // Alloc region used to satisfy allocation requests by the GC for |
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288 // survivor objects. |
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289 SurvivorGCAllocRegion _survivor_gc_alloc_region; |
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290 |
6595 | 291 // PLAB sizing policy for survivors. |
292 PLABStats _survivor_plab_stats; | |
293 | |
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294 // Alloc region used to satisfy allocation requests by the GC for |
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295 // old objects. |
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296 OldGCAllocRegion _old_gc_alloc_region; |
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297 |
6595 | 298 // PLAB sizing policy for tenured objects. |
299 PLABStats _old_plab_stats; | |
300 | |
301 PLABStats* stats_for_purpose(GCAllocPurpose purpose) { | |
302 PLABStats* stats = NULL; | |
303 | |
304 switch (purpose) { | |
305 case GCAllocForSurvived: | |
306 stats = &_survivor_plab_stats; | |
307 break; | |
308 case GCAllocForTenured: | |
309 stats = &_old_plab_stats; | |
310 break; | |
311 default: | |
312 assert(false, "unrecognized GCAllocPurpose"); | |
313 } | |
314 | |
315 return stats; | |
316 } | |
317 | |
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318 // The last old region we allocated to during the last GC. |
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319 // Typically, it is not full so we should re-use it during the next GC. |
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320 HeapRegion* _retained_old_gc_alloc_region; |
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321 |
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322 // It specifies whether we should attempt to expand the heap after a |
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323 // region allocation failure. If heap expansion fails we set this to |
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324 // false so that we don't re-attempt the heap expansion (it's likely |
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325 // that subsequent expansion attempts will also fail if one fails). |
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326 // Currently, it is only consulted during GC and it's reset at the |
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327 // start of each GC. |
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328 bool _expand_heap_after_alloc_failure; |
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329 |
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330 // It resets the mutator alloc region before new allocations can take place. |
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331 void init_mutator_alloc_region(); |
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332 |
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333 // It releases the mutator alloc region. |
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334 void release_mutator_alloc_region(); |
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335 |
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336 // It initializes the GC alloc regions at the start of a GC. |
10405 | 337 void init_gc_alloc_regions(EvacuationInfo& evacuation_info); |
342 | 338 |
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339 // It releases the GC alloc regions at the end of a GC. |
10405 | 340 void release_gc_alloc_regions(uint no_of_gc_workers, EvacuationInfo& evacuation_info); |
342 | 341 |
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342 // It does any cleanup that needs to be done on the GC alloc regions |
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343 // before a Full GC. |
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344 void abandon_gc_alloc_regions(); |
342 | 345 |
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346 // Helper for monitoring and management support. |
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347 G1MonitoringSupport* _g1mm; |
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348 |
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349 // Determines PLAB size for a particular allocation purpose. |
6595 | 350 size_t desired_plab_sz(GCAllocPurpose purpose); |
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351 |
342 | 352 // Outside of GC pauses, the number of bytes used in all regions other |
353 // than the current allocation region. | |
354 size_t _summary_bytes_used; | |
355 | |
526 | 356 // This is used for a quick test on whether a reference points into |
357 // the collection set or not. Basically, we have an array, with one | |
358 // byte per region, and that byte denotes whether the corresponding | |
359 // region is in the collection set or not. The entry corresponding | |
360 // the bottom of the heap, i.e., region 0, is pointed to by | |
361 // _in_cset_fast_test_base. The _in_cset_fast_test field has been | |
362 // biased so that it actually points to address 0 of the address | |
363 // space, to make the test as fast as possible (we can simply shift | |
364 // the address to address into it, instead of having to subtract the | |
365 // bottom of the heap from the address before shifting it; basically | |
366 // it works in the same way the card table works). | |
367 bool* _in_cset_fast_test; | |
368 | |
369 // The allocated array used for the fast test on whether a reference | |
370 // points into the collection set or not. This field is also used to | |
371 // free the array. | |
372 bool* _in_cset_fast_test_base; | |
373 | |
374 // The length of the _in_cset_fast_test_base array. | |
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375 uint _in_cset_fast_test_length; |
526 | 376 |
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377 volatile unsigned _gc_time_stamp; |
342 | 378 |
379 size_t* _surviving_young_words; | |
380 | |
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381 G1HRPrinter _hr_printer; |
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382 |
342 | 383 void setup_surviving_young_words(); |
384 void update_surviving_young_words(size_t* surv_young_words); | |
385 void cleanup_surviving_young_words(); | |
386 | |
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387 // It decides whether an explicit GC should start a concurrent cycle |
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388 // instead of doing a STW GC. Currently, a concurrent cycle is |
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389 // explicitly started if: |
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390 // (a) cause == _gc_locker and +GCLockerInvokesConcurrent, or |
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391 // (b) cause == _java_lang_system_gc and +ExplicitGCInvokesConcurrent. |
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392 // (c) cause == _g1_humongous_allocation |
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393 bool should_do_concurrent_full_gc(GCCause::Cause cause); |
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394 |
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395 // Keeps track of how many "old marking cycles" (i.e., Full GCs or |
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396 // concurrent cycles) we have started. |
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397 volatile unsigned int _old_marking_cycles_started; |
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398 |
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399 // Keeps track of how many "old marking cycles" (i.e., Full GCs or |
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400 // concurrent cycles) we have completed. |
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401 volatile unsigned int _old_marking_cycles_completed; |
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402 |
10405 | 403 bool _concurrent_cycle_started; |
404 | |
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405 // This is a non-product method that is helpful for testing. It is |
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406 // called at the end of a GC and artificially expands the heap by |
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407 // allocating a number of dead regions. This way we can induce very |
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408 // frequent marking cycles and stress the cleanup / concurrent |
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409 // cleanup code more (as all the regions that will be allocated by |
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410 // this method will be found dead by the marking cycle). |
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411 void allocate_dummy_regions() PRODUCT_RETURN; |
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412 |
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413 // Clear RSets after a compaction. It also resets the GC time stamps. |
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414 void clear_rsets_post_compaction(); |
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415 |
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416 // If the HR printer is active, dump the state of the regions in the |
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417 // heap after a compaction. |
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418 void print_hrs_post_compaction(); |
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419 |
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420 double verify(bool guard, const char* msg); |
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421 void verify_before_gc(); |
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422 void verify_after_gc(); |
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423 |
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424 void log_gc_header(); |
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425 void log_gc_footer(double pause_time_sec); |
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426 |
1973 | 427 // These are macros so that, if the assert fires, we get the correct |
428 // line number, file, etc. | |
429 | |
2361 | 430 #define heap_locking_asserts_err_msg(_extra_message_) \ |
2152 | 431 err_msg("%s : Heap_lock locked: %s, at safepoint: %s, is VM thread: %s", \ |
2361 | 432 (_extra_message_), \ |
2152 | 433 BOOL_TO_STR(Heap_lock->owned_by_self()), \ |
434 BOOL_TO_STR(SafepointSynchronize::is_at_safepoint()), \ | |
435 BOOL_TO_STR(Thread::current()->is_VM_thread())) | |
1973 | 436 |
437 #define assert_heap_locked() \ | |
438 do { \ | |
439 assert(Heap_lock->owned_by_self(), \ | |
440 heap_locking_asserts_err_msg("should be holding the Heap_lock")); \ | |
441 } while (0) | |
442 | |
2361 | 443 #define assert_heap_locked_or_at_safepoint(_should_be_vm_thread_) \ |
1973 | 444 do { \ |
445 assert(Heap_lock->owned_by_self() || \ | |
2152 | 446 (SafepointSynchronize::is_at_safepoint() && \ |
2361 | 447 ((_should_be_vm_thread_) == Thread::current()->is_VM_thread())), \ |
1973 | 448 heap_locking_asserts_err_msg("should be holding the Heap_lock or " \ |
449 "should be at a safepoint")); \ | |
450 } while (0) | |
451 | |
452 #define assert_heap_locked_and_not_at_safepoint() \ | |
453 do { \ | |
454 assert(Heap_lock->owned_by_self() && \ | |
455 !SafepointSynchronize::is_at_safepoint(), \ | |
456 heap_locking_asserts_err_msg("should be holding the Heap_lock and " \ | |
457 "should not be at a safepoint")); \ | |
458 } while (0) | |
459 | |
460 #define assert_heap_not_locked() \ | |
461 do { \ | |
462 assert(!Heap_lock->owned_by_self(), \ | |
463 heap_locking_asserts_err_msg("should not be holding the Heap_lock")); \ | |
464 } while (0) | |
465 | |
466 #define assert_heap_not_locked_and_not_at_safepoint() \ | |
467 do { \ | |
468 assert(!Heap_lock->owned_by_self() && \ | |
469 !SafepointSynchronize::is_at_safepoint(), \ | |
470 heap_locking_asserts_err_msg("should not be holding the Heap_lock and " \ | |
471 "should not be at a safepoint")); \ | |
472 } while (0) | |
473 | |
2361 | 474 #define assert_at_safepoint(_should_be_vm_thread_) \ |
1973 | 475 do { \ |
2152 | 476 assert(SafepointSynchronize::is_at_safepoint() && \ |
2361 | 477 ((_should_be_vm_thread_) == Thread::current()->is_VM_thread()), \ |
1973 | 478 heap_locking_asserts_err_msg("should be at a safepoint")); \ |
479 } while (0) | |
480 | |
481 #define assert_not_at_safepoint() \ | |
482 do { \ | |
483 assert(!SafepointSynchronize::is_at_safepoint(), \ | |
484 heap_locking_asserts_err_msg("should not be at a safepoint")); \ | |
485 } while (0) | |
486 | |
342 | 487 protected: |
488 | |
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489 // The young region list. |
342 | 490 YoungList* _young_list; |
491 | |
492 // The current policy object for the collector. | |
493 G1CollectorPolicy* _g1_policy; | |
494 | |
2152 | 495 // This is the second level of trying to allocate a new region. If |
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496 // new_region() didn't find a region on the free_list, this call will |
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497 // check whether there's anything available on the |
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498 // secondary_free_list and/or wait for more regions to appear on |
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499 // that list, if _free_regions_coming is set. |
2361 | 500 HeapRegion* new_region_try_secondary_free_list(); |
342 | 501 |
2361 | 502 // Try to allocate a single non-humongous HeapRegion sufficient for |
503 // an allocation of the given word_size. If do_expand is true, | |
504 // attempt to expand the heap if necessary to satisfy the allocation | |
505 // request. | |
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506 HeapRegion* new_region(size_t word_size, bool do_expand); |
342 | 507 |
2361 | 508 // Attempt to satisfy a humongous allocation request of the given |
509 // size by finding a contiguous set of free regions of num_regions | |
510 // length and remove them from the master free list. Return the | |
3766 | 511 // index of the first region or G1_NULL_HRS_INDEX if the search |
512 // was unsuccessful. | |
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513 uint humongous_obj_allocate_find_first(uint num_regions, |
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514 size_t word_size); |
342 | 515 |
2361 | 516 // Initialize a contiguous set of free regions of length num_regions |
517 // and starting at index first so that they appear as a single | |
518 // humongous region. | |
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519 HeapWord* humongous_obj_allocate_initialize_regions(uint first, |
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520 uint num_regions, |
2361 | 521 size_t word_size); |
522 | |
523 // Attempt to allocate a humongous object of the given size. Return | |
524 // NULL if unsuccessful. | |
2152 | 525 HeapWord* humongous_obj_allocate(size_t word_size); |
1973 | 526 |
527 // The following two methods, allocate_new_tlab() and | |
528 // mem_allocate(), are the two main entry points from the runtime | |
529 // into the G1's allocation routines. They have the following | |
530 // assumptions: | |
531 // | |
532 // * They should both be called outside safepoints. | |
533 // | |
534 // * They should both be called without holding the Heap_lock. | |
535 // | |
536 // * All allocation requests for new TLABs should go to | |
537 // allocate_new_tlab(). | |
538 // | |
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539 // * All non-TLAB allocation requests should go to mem_allocate(). |
1973 | 540 // |
541 // * If either call cannot satisfy the allocation request using the | |
542 // current allocating region, they will try to get a new one. If | |
543 // this fails, they will attempt to do an evacuation pause and | |
544 // retry the allocation. | |
545 // | |
546 // * If all allocation attempts fail, even after trying to schedule | |
547 // an evacuation pause, allocate_new_tlab() will return NULL, | |
548 // whereas mem_allocate() will attempt a heap expansion and/or | |
549 // schedule a Full GC. | |
550 // | |
551 // * We do not allow humongous-sized TLABs. So, allocate_new_tlab | |
552 // should never be called with word_size being humongous. All | |
553 // humongous allocation requests should go to mem_allocate() which | |
554 // will satisfy them with a special path. | |
555 | |
556 virtual HeapWord* allocate_new_tlab(size_t word_size); | |
557 | |
558 virtual HeapWord* mem_allocate(size_t word_size, | |
559 bool* gc_overhead_limit_was_exceeded); | |
342 | 560 |
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561 // The following three methods take a gc_count_before_ret |
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562 // parameter which is used to return the GC count if the method |
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563 // returns NULL. Given that we are required to read the GC count |
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564 // while holding the Heap_lock, and these paths will take the |
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565 // Heap_lock at some point, it's easier to get them to read the GC |
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566 // count while holding the Heap_lock before they return NULL instead |
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567 // of the caller (namely: mem_allocate()) having to also take the |
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568 // Heap_lock just to read the GC count. |
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569 |
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570 // First-level mutator allocation attempt: try to allocate out of |
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571 // the mutator alloc region without taking the Heap_lock. This |
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572 // should only be used for non-humongous allocations. |
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573 inline HeapWord* attempt_allocation(size_t word_size, |
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574 unsigned int* gc_count_before_ret, |
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575 int* gclocker_retry_count_ret); |
342 | 576 |
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577 // Second-level mutator allocation attempt: take the Heap_lock and |
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578 // retry the allocation attempt, potentially scheduling a GC |
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579 // pause. This should only be used for non-humongous allocations. |
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580 HeapWord* attempt_allocation_slow(size_t word_size, |
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581 unsigned int* gc_count_before_ret, |
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582 int* gclocker_retry_count_ret); |
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583 |
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584 // Takes the Heap_lock and attempts a humongous allocation. It can |
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585 // potentially schedule a GC pause. |
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586 HeapWord* attempt_allocation_humongous(size_t word_size, |
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587 unsigned int* gc_count_before_ret, |
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588 int* gclocker_retry_count_ret); |
1973 | 589 |
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590 // Allocation attempt that should be called during safepoints (e.g., |
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591 // at the end of a successful GC). expect_null_mutator_alloc_region |
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592 // specifies whether the mutator alloc region is expected to be NULL |
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593 // or not. |
1973 | 594 HeapWord* attempt_allocation_at_safepoint(size_t word_size, |
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595 bool expect_null_mutator_alloc_region); |
1973 | 596 |
597 // It dirties the cards that cover the block so that so that the post | |
598 // write barrier never queues anything when updating objects on this | |
599 // block. It is assumed (and in fact we assert) that the block | |
600 // belongs to a young region. | |
601 inline void dirty_young_block(HeapWord* start, size_t word_size); | |
342 | 602 |
603 // Allocate blocks during garbage collection. Will ensure an | |
604 // allocation region, either by picking one or expanding the | |
605 // heap, and then allocate a block of the given size. The block | |
606 // may not be a humongous - it must fit into a single heap region. | |
607 HeapWord* par_allocate_during_gc(GCAllocPurpose purpose, size_t word_size); | |
608 | |
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609 HeapWord* allocate_during_gc_slow(GCAllocPurpose purpose, |
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610 HeapRegion* alloc_region, |
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611 bool par, |
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612 size_t word_size); |
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613 |
342 | 614 // Ensure that no further allocations can happen in "r", bearing in mind |
615 // that parallel threads might be attempting allocations. | |
616 void par_allocate_remaining_space(HeapRegion* r); | |
617 | |
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618 // Allocation attempt during GC for a survivor object / PLAB. |
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619 inline HeapWord* survivor_attempt_allocation(size_t word_size); |
545 | 620 |
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621 // Allocation attempt during GC for an old object / PLAB. |
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622 inline HeapWord* old_attempt_allocation(size_t word_size); |
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623 |
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624 // These methods are the "callbacks" from the G1AllocRegion class. |
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625 |
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626 // For mutator alloc regions. |
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627 HeapRegion* new_mutator_alloc_region(size_t word_size, bool force); |
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628 void retire_mutator_alloc_region(HeapRegion* alloc_region, |
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629 size_t allocated_bytes); |
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630 |
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631 // For GC alloc regions. |
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632 HeapRegion* new_gc_alloc_region(size_t word_size, uint count, |
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633 GCAllocPurpose ap); |
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634 void retire_gc_alloc_region(HeapRegion* alloc_region, |
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635 size_t allocated_bytes, GCAllocPurpose ap); |
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636 |
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637 // - if explicit_gc is true, the GC is for a System.gc() or a heap |
1973 | 638 // inspection request and should collect the entire heap |
639 // - if clear_all_soft_refs is true, all soft references should be | |
640 // cleared during the GC | |
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641 // - if explicit_gc is false, word_size describes the allocation that |
1973 | 642 // the GC should attempt (at least) to satisfy |
643 // - it returns false if it is unable to do the collection due to the | |
644 // GC locker being active, true otherwise | |
645 bool do_collection(bool explicit_gc, | |
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646 bool clear_all_soft_refs, |
342 | 647 size_t word_size); |
648 | |
649 // Callback from VM_G1CollectFull operation. | |
650 // Perform a full collection. | |
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651 virtual void do_full_collection(bool clear_all_soft_refs); |
342 | 652 |
653 // Resize the heap if necessary after a full collection. If this is | |
654 // after a collect-for allocation, "word_size" is the allocation size, | |
655 // and will be considered part of the used portion of the heap. | |
656 void resize_if_necessary_after_full_collection(size_t word_size); | |
657 | |
658 // Callback from VM_G1CollectForAllocation operation. | |
659 // This function does everything necessary/possible to satisfy a | |
660 // failed allocation request (including collection, expansion, etc.) | |
1973 | 661 HeapWord* satisfy_failed_allocation(size_t word_size, bool* succeeded); |
342 | 662 |
663 // Attempting to expand the heap sufficiently | |
664 // to support an allocation of the given "word_size". If | |
665 // successful, perform the allocation and return the address of the | |
666 // allocated block, or else "NULL". | |
1973 | 667 HeapWord* expand_and_allocate(size_t word_size); |
342 | 668 |
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669 // Process any reference objects discovered during |
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670 // an incremental evacuation pause. |
6819 | 671 void process_discovered_references(uint no_of_gc_workers); |
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672 |
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673 // Enqueue any remaining discovered references |
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674 // after processing. |
6819 | 675 void enqueue_discovered_references(uint no_of_gc_workers); |
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676 |
342 | 677 public: |
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678 |
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679 G1MonitoringSupport* g1mm() { |
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680 assert(_g1mm != NULL, "should have been initialized"); |
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681 return _g1mm; |
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682 } |
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683 |
342 | 684 // Expand the garbage-first heap by at least the given size (in bytes!). |
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685 // Returns true if the heap was expanded by the requested amount; |
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686 // false otherwise. |
342 | 687 // (Rounds up to a HeapRegion boundary.) |
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688 bool expand(size_t expand_bytes); |
342 | 689 |
690 // Do anything common to GC's. | |
691 virtual void gc_prologue(bool full); | |
692 virtual void gc_epilogue(bool full); | |
693 | |
526 | 694 // We register a region with the fast "in collection set" test. We |
695 // simply set to true the array slot corresponding to this region. | |
696 void register_region_with_in_cset_fast_test(HeapRegion* r) { | |
697 assert(_in_cset_fast_test_base != NULL, "sanity"); | |
698 assert(r->in_collection_set(), "invariant"); | |
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699 uint index = r->hrs_index(); |
3766 | 700 assert(index < _in_cset_fast_test_length, "invariant"); |
526 | 701 assert(!_in_cset_fast_test_base[index], "invariant"); |
702 _in_cset_fast_test_base[index] = true; | |
703 } | |
704 | |
705 // This is a fast test on whether a reference points into the | |
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706 // collection set or not. Assume that the reference |
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707 // points into the heap. |
526 | 708 bool in_cset_fast_test(oop obj) { |
709 assert(_in_cset_fast_test != NULL, "sanity"); | |
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710 assert(_g1_committed.contains((HeapWord*) obj), err_msg("Given reference outside of heap, is "PTR_FORMAT, (HeapWord*)obj)); |
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711 // no need to subtract the bottom of the heap from obj, |
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712 // _in_cset_fast_test is biased |
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713 uintx index = cast_from_oop<uintx>(obj) >> HeapRegion::LogOfHRGrainBytes; |
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714 bool ret = _in_cset_fast_test[index]; |
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715 // let's make sure the result is consistent with what the slower |
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716 // test returns |
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717 assert( ret || !obj_in_cs(obj), "sanity"); |
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718 assert(!ret || obj_in_cs(obj), "sanity"); |
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719 return ret; |
526 | 720 } |
721 | |
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722 void clear_cset_fast_test() { |
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723 assert(_in_cset_fast_test_base != NULL, "sanity"); |
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724 memset(_in_cset_fast_test_base, false, |
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725 (size_t) _in_cset_fast_test_length * sizeof(bool)); |
1394
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726 } |
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727 |
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728 // This is called at the start of either a concurrent cycle or a Full |
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729 // GC to update the number of old marking cycles started. |
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730 void increment_old_marking_cycles_started(); |
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731 |
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732 // This is called at the end of either a concurrent cycle or a Full |
6120
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733 // GC to update the number of old marking cycles completed. Those two |
1656
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734 // can happen in a nested fashion, i.e., we start a concurrent |
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735 // cycle, a Full GC happens half-way through it which ends first, |
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736 // and then the cycle notices that a Full GC happened and ends |
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737 // too. The concurrent parameter is a boolean to help us do a bit |
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738 // tighter consistency checking in the method. If concurrent is |
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739 // false, the caller is the inner caller in the nesting (i.e., the |
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740 // Full GC). If concurrent is true, the caller is the outer caller |
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741 // in this nesting (i.e., the concurrent cycle). Further nesting is |
6120
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742 // not currently supported. The end of this call also notifies |
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743 // the FullGCCount_lock in case a Java thread is waiting for a full |
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744 // GC to happen (e.g., it called System.gc() with |
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745 // +ExplicitGCInvokesConcurrent). |
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746 void increment_old_marking_cycles_completed(bool concurrent); |
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747 |
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748 unsigned int old_marking_cycles_completed() { |
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749 return _old_marking_cycles_completed; |
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750 } |
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751 |
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752 void register_concurrent_cycle_start(const Ticks& start_time); |
10405 | 753 void register_concurrent_cycle_end(); |
754 void trace_heap_after_concurrent_cycle(); | |
755 | |
756 G1YCType yc_type(); | |
757 | |
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758 G1HRPrinter* hr_printer() { return &_hr_printer; } |
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759 |
342 | 760 protected: |
761 | |
762 // Shrink the garbage-first heap by at most the given size (in bytes!). | |
763 // (Rounds down to a HeapRegion boundary.) | |
764 virtual void shrink(size_t expand_bytes); | |
765 void shrink_helper(size_t expand_bytes); | |
766 | |
1709 | 767 #if TASKQUEUE_STATS |
768 static void print_taskqueue_stats_hdr(outputStream* const st = gclog_or_tty); | |
769 void print_taskqueue_stats(outputStream* const st = gclog_or_tty) const; | |
770 void reset_taskqueue_stats(); | |
771 #endif // TASKQUEUE_STATS | |
772 | |
1973 | 773 // Schedule the VM operation that will do an evacuation pause to |
774 // satisfy an allocation request of word_size. *succeeded will | |
775 // return whether the VM operation was successful (it did do an | |
776 // evacuation pause) or not (another thread beat us to it or the GC | |
777 // locker was active). Given that we should not be holding the | |
778 // Heap_lock when we enter this method, we will pass the | |
779 // gc_count_before (i.e., total_collections()) as a parameter since | |
780 // it has to be read while holding the Heap_lock. Currently, both | |
781 // methods that call do_collection_pause() release the Heap_lock | |
782 // before the call, so it's easy to read gc_count_before just before. | |
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783 HeapWord* do_collection_pause(size_t word_size, |
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784 unsigned int gc_count_before, |
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785 bool* succeeded, |
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786 GCCause::Cause gc_cause); |
342 | 787 |
788 // The guts of the incremental collection pause, executed by the vm | |
1973 | 789 // thread. It returns false if it is unable to do the collection due |
790 // to the GC locker being active, true otherwise | |
791 bool do_collection_pause_at_safepoint(double target_pause_time_ms); | |
342 | 792 |
793 // Actually do the work of evacuating the collection set. | |
10405 | 794 void evacuate_collection_set(EvacuationInfo& evacuation_info); |
342 | 795 |
796 // The g1 remembered set of the heap. | |
797 G1RemSet* _g1_rem_set; | |
798 | |
616
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799 // A set of cards that cover the objects for which the Rsets should be updated |
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800 // concurrently after the collection. |
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801 DirtyCardQueueSet _dirty_card_queue_set; |
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802 |
342 | 803 // The closure used to refine a single card. |
804 RefineCardTableEntryClosure* _refine_cte_cl; | |
805 | |
806 // A function to check the consistency of dirty card logs. | |
807 void check_ct_logs_at_safepoint(); | |
808 | |
1705 | 809 // A DirtyCardQueueSet that is used to hold cards that contain |
810 // references into the current collection set. This is used to | |
811 // update the remembered sets of the regions in the collection | |
812 // set in the event of an evacuation failure. | |
813 DirtyCardQueueSet _into_cset_dirty_card_queue_set; | |
814 | |
342 | 815 // After a collection pause, make the regions in the CS into free |
816 // regions. | |
10405 | 817 void free_collection_set(HeapRegion* cs_head, EvacuationInfo& evacuation_info); |
342 | 818 |
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819 // Abandon the current collection set without recording policy |
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820 // statistics or updating free lists. |
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821 void abandon_collection_set(HeapRegion* cs_head); |
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822 |
342 | 823 // Applies "scan_non_heap_roots" to roots outside the heap, |
824 // "scan_rs" to roots inside the heap (having done "set_region" to | |
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825 // indicate the region in which the root resides), |
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826 // and does "scan_metadata" If "scan_rs" is |
342 | 827 // NULL, then this step is skipped. The "worker_i" |
828 // param is for use with parallel roots processing, and should be | |
829 // the "i" of the calling parallel worker thread's work(i) function. | |
830 // In the sequential case this param will be ignored. | |
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831 void g1_process_strong_roots(bool is_scavenging, |
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832 ScanningOption so, |
342 | 833 OopClosure* scan_non_heap_roots, |
834 OopsInHeapRegionClosure* scan_rs, | |
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835 G1KlassScanClosure* scan_klasses, |
342 | 836 int worker_i); |
837 | |
838 // Apply "blk" to all the weak roots of the system. These include | |
839 // JNI weak roots, the code cache, system dictionary, symbol table, | |
840 // string table, and referents of reachable weak refs. | |
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841 void g1_process_weak_roots(OopClosure* root_closure); |
342 | 842 |
2361 | 843 // Frees a non-humongous region by initializing its contents and |
2152 | 844 // adding it to the free list that's passed as a parameter (this is |
845 // usually a local list which will be appended to the master free | |
846 // list later). The used bytes of freed regions are accumulated in | |
847 // pre_used. If par is true, the region's RSet will not be freed | |
848 // up. The assumption is that this will be done later. | |
849 void free_region(HeapRegion* hr, | |
850 size_t* pre_used, | |
851 FreeRegionList* free_list, | |
852 bool par); | |
342 | 853 |
2361 | 854 // Frees a humongous region by collapsing it into individual regions |
855 // and calling free_region() for each of them. The freed regions | |
856 // will be added to the free list that's passed as a parameter (this | |
857 // is usually a local list which will be appended to the master free | |
858 // list later). The used bytes of freed regions are accumulated in | |
859 // pre_used. If par is true, the region's RSet will not be freed | |
860 // up. The assumption is that this will be done later. | |
2152 | 861 void free_humongous_region(HeapRegion* hr, |
862 size_t* pre_used, | |
863 FreeRegionList* free_list, | |
864 HumongousRegionSet* humongous_proxy_set, | |
865 bool par); | |
342 | 866 |
3766 | 867 // Notifies all the necessary spaces that the committed space has |
868 // been updated (either expanded or shrunk). It should be called | |
869 // after _g1_storage is updated. | |
870 void update_committed_space(HeapWord* old_end, HeapWord* new_end); | |
871 | |
342 | 872 // The concurrent marker (and the thread it runs in.) |
873 ConcurrentMark* _cm; | |
874 ConcurrentMarkThread* _cmThread; | |
875 bool _mark_in_progress; | |
876 | |
877 // The concurrent refiner. | |
878 ConcurrentG1Refine* _cg1r; | |
879 | |
880 // The parallel task queues | |
881 RefToScanQueueSet *_task_queues; | |
882 | |
883 // True iff a evacuation has failed in the current collection. | |
884 bool _evacuation_failed; | |
885 | |
10405 | 886 EvacuationFailedInfo* _evacuation_failed_info_array; |
342 | 887 |
888 // Failed evacuations cause some logical from-space objects to have | |
889 // forwarding pointers to themselves. Reset them. | |
890 void remove_self_forwarding_pointers(); | |
891 | |
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892 // Together, these store an object with a preserved mark, and its mark value. |
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893 Stack<oop, mtGC> _objs_with_preserved_marks; |
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894 Stack<markOop, mtGC> _preserved_marks_of_objs; |
342 | 895 |
896 // Preserve the mark of "obj", if necessary, in preparation for its mark | |
897 // word being overwritten with a self-forwarding-pointer. | |
898 void preserve_mark_if_necessary(oop obj, markOop m); | |
899 | |
900 // The stack of evac-failure objects left to be scanned. | |
901 GrowableArray<oop>* _evac_failure_scan_stack; | |
902 // The closure to apply to evac-failure objects. | |
903 | |
904 OopsInHeapRegionClosure* _evac_failure_closure; | |
905 // Set the field above. | |
906 void | |
907 set_evac_failure_closure(OopsInHeapRegionClosure* evac_failure_closure) { | |
908 _evac_failure_closure = evac_failure_closure; | |
909 } | |
910 | |
911 // Push "obj" on the scan stack. | |
912 void push_on_evac_failure_scan_stack(oop obj); | |
913 // Process scan stack entries until the stack is empty. | |
914 void drain_evac_failure_scan_stack(); | |
915 // True iff an invocation of "drain_scan_stack" is in progress; to | |
916 // prevent unnecessary recursion. | |
917 bool _drain_in_progress; | |
918 | |
919 // Do any necessary initialization for evacuation-failure handling. | |
920 // "cl" is the closure that will be used to process evac-failure | |
921 // objects. | |
922 void init_for_evac_failure(OopsInHeapRegionClosure* cl); | |
923 // Do any necessary cleanup for evacuation-failure handling data | |
924 // structures. | |
925 void finalize_for_evac_failure(); | |
926 | |
927 // An attempt to evacuate "obj" has failed; take necessary steps. | |
10405 | 928 oop handle_evacuation_failure_par(G1ParScanThreadState* _par_scan_state, oop obj); |
342 | 929 void handle_evacuation_failure_common(oop obj, markOop m); |
930 | |
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931 #ifndef PRODUCT |
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932 // Support for forcing evacuation failures. Analogous to |
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933 // PromotionFailureALot for the other collectors. |
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934 |
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935 // Records whether G1EvacuationFailureALot should be in effect |
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936 // for the current GC |
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937 bool _evacuation_failure_alot_for_current_gc; |
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938 |
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939 // Used to record the GC number for interval checking when |
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940 // determining whether G1EvaucationFailureALot is in effect |
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941 // for the current GC. |
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942 size_t _evacuation_failure_alot_gc_number; |
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943 |
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944 // Count of the number of evacuations between failures. |
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945 volatile size_t _evacuation_failure_alot_count; |
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946 |
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947 // Set whether G1EvacuationFailureALot should be in effect |
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948 // for the current GC (based upon the type of GC and which |
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949 // command line flags are set); |
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950 inline bool evacuation_failure_alot_for_gc_type(bool gcs_are_young, |
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951 bool during_initial_mark, |
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952 bool during_marking); |
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953 |
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954 inline void set_evacuation_failure_alot_for_current_gc(); |
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955 |
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956 // Return true if it's time to cause an evacuation failure. |
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957 inline bool evacuation_should_fail(); |
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958 |
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959 // Reset the G1EvacuationFailureALot counters. Should be called at |
10405 | 960 // the end of an evacuation pause in which an evacuation failure occurred. |
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961 inline void reset_evacuation_should_fail(); |
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962 #endif // !PRODUCT |
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963 |
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964 // ("Weak") Reference processing support. |
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965 // |
10405 | 966 // G1 has 2 instances of the reference processor class. One |
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967 // (_ref_processor_cm) handles reference object discovery |
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968 // and subsequent processing during concurrent marking cycles. |
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969 // |
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970 // The other (_ref_processor_stw) handles reference object |
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971 // discovery and processing during full GCs and incremental |
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972 // evacuation pauses. |
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973 // |
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974 // During an incremental pause, reference discovery will be |
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975 // temporarily disabled for _ref_processor_cm and will be |
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976 // enabled for _ref_processor_stw. At the end of the evacuation |
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977 // pause references discovered by _ref_processor_stw will be |
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978 // processed and discovery will be disabled. The previous |
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979 // setting for reference object discovery for _ref_processor_cm |
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980 // will be re-instated. |
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981 // |
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982 // At the start of marking: |
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983 // * Discovery by the CM ref processor is verified to be inactive |
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984 // and it's discovered lists are empty. |
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985 // * Discovery by the CM ref processor is then enabled. |
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986 // |
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987 // At the end of marking: |
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988 // * Any references on the CM ref processor's discovered |
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989 // lists are processed (possibly MT). |
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990 // |
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991 // At the start of full GC we: |
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992 // * Disable discovery by the CM ref processor and |
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993 // empty CM ref processor's discovered lists |
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994 // (without processing any entries). |
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995 // * Verify that the STW ref processor is inactive and it's |
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996 // discovered lists are empty. |
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997 // * Temporarily set STW ref processor discovery as single threaded. |
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998 // * Temporarily clear the STW ref processor's _is_alive_non_header |
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999 // field. |
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1000 // * Finally enable discovery by the STW ref processor. |
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1001 // |
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1002 // The STW ref processor is used to record any discovered |
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1003 // references during the full GC. |
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1004 // |
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1005 // At the end of a full GC we: |
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1006 // * Enqueue any reference objects discovered by the STW ref processor |
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1007 // that have non-live referents. This has the side-effect of |
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1008 // making the STW ref processor inactive by disabling discovery. |
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1009 // * Verify that the CM ref processor is still inactive |
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1010 // and no references have been placed on it's discovered |
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1011 // lists (also checked as a precondition during initial marking). |
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1012 |
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1013 // The (stw) reference processor... |
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1014 ReferenceProcessor* _ref_processor_stw; |
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1015 |
10405 | 1016 STWGCTimer* _gc_timer_stw; |
1017 ConcurrentGCTimer* _gc_timer_cm; | |
1018 | |
1019 G1OldTracer* _gc_tracer_cm; | |
1020 G1NewTracer* _gc_tracer_stw; | |
1021 | |
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1022 // During reference object discovery, the _is_alive_non_header |
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1023 // closure (if non-null) is applied to the referent object to |
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1024 // determine whether the referent is live. If so then the |
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1025 // reference object does not need to be 'discovered' and can |
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1026 // be treated as a regular oop. This has the benefit of reducing |
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1027 // the number of 'discovered' reference objects that need to |
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1028 // be processed. |
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1029 // |
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1030 // Instance of the is_alive closure for embedding into the |
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1031 // STW reference processor as the _is_alive_non_header field. |
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1032 // Supplying a value for the _is_alive_non_header field is |
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1033 // optional but doing so prevents unnecessary additions to |
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1034 // the discovered lists during reference discovery. |
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1035 G1STWIsAliveClosure _is_alive_closure_stw; |
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1036 |
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1037 // The (concurrent marking) reference processor... |
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1038 ReferenceProcessor* _ref_processor_cm; |
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1039 |
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1040 // Instance of the concurrent mark is_alive closure for embedding |
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1041 // into the Concurrent Marking reference processor as the |
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1042 // _is_alive_non_header field. Supplying a value for the |
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1043 // _is_alive_non_header field is optional but doing so prevents |
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1044 // unnecessary additions to the discovered lists during reference |
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1045 // discovery. |
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1046 G1CMIsAliveClosure _is_alive_closure_cm; |
342 | 1047 |
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1048 // Cache used by G1CollectedHeap::start_cset_region_for_worker(). |
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1049 HeapRegion** _worker_cset_start_region; |
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1050 |
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1051 // Time stamp to validate the regions recorded in the cache |
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1052 // used by G1CollectedHeap::start_cset_region_for_worker(). |
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1053 // The heap region entry for a given worker is valid iff |
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1054 // the associated time stamp value matches the current value |
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1055 // of G1CollectedHeap::_gc_time_stamp. |
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1056 unsigned int* _worker_cset_start_region_time_stamp; |
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1057 |
342 | 1058 enum G1H_process_strong_roots_tasks { |
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1059 G1H_PS_filter_satb_buffers, |
342 | 1060 G1H_PS_refProcessor_oops_do, |
1061 // Leave this one last. | |
1062 G1H_PS_NumElements | |
1063 }; | |
1064 | |
1065 SubTasksDone* _process_strong_tasks; | |
1066 | |
2152 | 1067 volatile bool _free_regions_coming; |
342 | 1068 |
1069 public: | |
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1070 |
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1071 SubTasksDone* process_strong_tasks() { return _process_strong_tasks; } |
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1072 |
342 | 1073 void set_refine_cte_cl_concurrency(bool concurrent); |
1074 | |
1709 | 1075 RefToScanQueue *task_queue(int i) const; |
342 | 1076 |
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1077 // A set of cards where updates happened during the GC |
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1078 DirtyCardQueueSet& dirty_card_queue_set() { return _dirty_card_queue_set; } |
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1079 |
1705 | 1080 // A DirtyCardQueueSet that is used to hold cards that contain |
1081 // references into the current collection set. This is used to | |
1082 // update the remembered sets of the regions in the collection | |
1083 // set in the event of an evacuation failure. | |
1084 DirtyCardQueueSet& into_cset_dirty_card_queue_set() | |
1085 { return _into_cset_dirty_card_queue_set; } | |
1086 | |
342 | 1087 // Create a G1CollectedHeap with the specified policy. |
1088 // Must call the initialize method afterwards. | |
1089 // May not return if something goes wrong. | |
1090 G1CollectedHeap(G1CollectorPolicy* policy); | |
1091 | |
1092 // Initialize the G1CollectedHeap to have the initial and | |
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1093 // maximum sizes and remembered and barrier sets |
342 | 1094 // specified by the policy object. |
1095 jint initialize(); | |
1096 | |
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1097 // Return the (conservative) maximum heap alignment for any G1 heap |
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1098 static size_t conservative_max_heap_alignment(); |
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1099 |
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1100 // Initialize weak reference processing. |
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1101 virtual void ref_processing_init(); |
342 | 1102 |
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1103 void set_par_threads(uint t) { |
342 | 1104 SharedHeap::set_par_threads(t); |
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1105 // Done in SharedHeap but oddly there are |
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1106 // two _process_strong_tasks's in a G1CollectedHeap |
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1107 // so do it here too. |
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1108 _process_strong_tasks->set_n_threads(t); |
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1109 } |
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1110 |
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1111 // Set _n_par_threads according to a policy TBD. |
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1112 void set_par_threads(); |
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1113 |
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1114 void set_n_termination(int t) { |
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1115 _process_strong_tasks->set_n_threads(t); |
342 | 1116 } |
1117 | |
1118 virtual CollectedHeap::Name kind() const { | |
1119 return CollectedHeap::G1CollectedHeap; | |
1120 } | |
1121 | |
1122 // The current policy object for the collector. | |
1123 G1CollectorPolicy* g1_policy() const { return _g1_policy; } | |
1124 | |
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1125 virtual CollectorPolicy* collector_policy() const { return (CollectorPolicy*) g1_policy(); } |
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1126 |
342 | 1127 // Adaptive size policy. No such thing for g1. |
1128 virtual AdaptiveSizePolicy* size_policy() { return NULL; } | |
1129 | |
1130 // The rem set and barrier set. | |
1131 G1RemSet* g1_rem_set() const { return _g1_rem_set; } | |
1132 | |
1133 unsigned get_gc_time_stamp() { | |
1134 return _gc_time_stamp; | |
1135 } | |
1136 | |
1137 void reset_gc_time_stamp() { | |
1138 _gc_time_stamp = 0; | |
353
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1139 OrderAccess::fence(); |
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1140 // Clear the cached CSet starting regions and time stamps. |
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1141 // Their validity is dependent on the GC timestamp. |
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1142 clear_cset_start_regions(); |
353
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1143 } |
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1144 |
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1145 void check_gc_time_stamps() PRODUCT_RETURN; |
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1146 |
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1147 void increment_gc_time_stamp() { |
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1148 ++_gc_time_stamp; |
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1149 OrderAccess::fence(); |
342 | 1150 } |
1151 | |
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1152 // Reset the given region's GC timestamp. If it's starts humongous, |
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1153 // also reset the GC timestamp of its corresponding |
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1154 // continues humongous regions too. |
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1155 void reset_gc_time_stamps(HeapRegion* hr); |
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1156 |
1705 | 1157 void iterate_dirty_card_closure(CardTableEntryClosure* cl, |
1158 DirtyCardQueue* into_cset_dcq, | |
1159 bool concurrent, int worker_i); | |
342 | 1160 |
1161 // The shared block offset table array. | |
1162 G1BlockOffsetSharedArray* bot_shared() const { return _bot_shared; } | |
1163 | |
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1164 // Reference Processing accessors |
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1165 |
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1166 // The STW reference processor.... |
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1167 ReferenceProcessor* ref_processor_stw() const { return _ref_processor_stw; } |
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1168 |
10405 | 1169 // The Concurrent Marking reference processor... |
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1170 ReferenceProcessor* ref_processor_cm() const { return _ref_processor_cm; } |
342 | 1171 |
10405 | 1172 ConcurrentGCTimer* gc_timer_cm() const { return _gc_timer_cm; } |
1173 G1OldTracer* gc_tracer_cm() const { return _gc_tracer_cm; } | |
1174 | |
342 | 1175 virtual size_t capacity() const; |
1176 virtual size_t used() const; | |
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1177 // This should be called when we're not holding the heap lock. The |
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1178 // result might be a bit inaccurate. |
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1179 size_t used_unlocked() const; |
342 | 1180 size_t recalculate_used() const; |
1181 | |
1182 // These virtual functions do the actual allocation. | |
1183 // Some heaps may offer a contiguous region for shared non-blocking | |
1184 // allocation, via inlined code (by exporting the address of the top and | |
1185 // end fields defining the extent of the contiguous allocation region.) | |
1186 // But G1CollectedHeap doesn't yet support this. | |
1187 | |
1188 // Return an estimate of the maximum allocation that could be performed | |
1189 // without triggering any collection or expansion activity. In a | |
1190 // generational collector, for example, this is probably the largest | |
1191 // allocation that could be supported (without expansion) in the youngest | |
1192 // generation. It is "unsafe" because no locks are taken; the result | |
1193 // should be treated as an approximation, not a guarantee, for use in | |
1194 // heuristic resizing decisions. | |
1195 virtual size_t unsafe_max_alloc(); | |
1196 | |
1197 virtual bool is_maximal_no_gc() const { | |
1198 return _g1_storage.uncommitted_size() == 0; | |
1199 } | |
1200 | |
1201 // The total number of regions in the heap. | |
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1202 uint n_regions() { return _hrs.length(); } |
3766 | 1203 |
1204 // The max number of regions in the heap. | |
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1205 uint max_regions() { return _hrs.max_length(); } |
342 | 1206 |
1207 // The number of regions that are completely free. | |
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1208 uint free_regions() { return _free_list.length(); } |
342 | 1209 |
1210 // The number of regions that are not completely free. | |
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1211 uint used_regions() { return n_regions() - free_regions(); } |
342 | 1212 |
1213 // The number of regions available for "regular" expansion. | |
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1214 uint expansion_regions() { return _expansion_regions; } |
342 | 1215 |
3766 | 1216 // Factory method for HeapRegion instances. It will return NULL if |
1217 // the allocation fails. | |
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1218 HeapRegion* new_heap_region(uint hrs_index, HeapWord* bottom); |
3766 | 1219 |
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1220 void verify_not_dirty_region(HeapRegion* hr) PRODUCT_RETURN; |
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1221 void verify_dirty_region(HeapRegion* hr) PRODUCT_RETURN; |
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1222 void verify_dirty_young_list(HeapRegion* head) PRODUCT_RETURN; |
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1223 void verify_dirty_young_regions() PRODUCT_RETURN; |
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1224 |
2152 | 1225 // verify_region_sets() performs verification over the region |
1226 // lists. It will be compiled in the product code to be used when | |
1227 // necessary (i.e., during heap verification). | |
1228 void verify_region_sets(); | |
342 | 1229 |
2152 | 1230 // verify_region_sets_optional() is planted in the code for |
1231 // list verification in non-product builds (and it can be enabled in | |
10405 | 1232 // product builds by defining HEAP_REGION_SET_FORCE_VERIFY to be 1). |
2152 | 1233 #if HEAP_REGION_SET_FORCE_VERIFY |
1234 void verify_region_sets_optional() { | |
1235 verify_region_sets(); | |
1236 } | |
1237 #else // HEAP_REGION_SET_FORCE_VERIFY | |
1238 void verify_region_sets_optional() { } | |
1239 #endif // HEAP_REGION_SET_FORCE_VERIFY | |
342 | 1240 |
2152 | 1241 #ifdef ASSERT |
2361 | 1242 bool is_on_master_free_list(HeapRegion* hr) { |
2152 | 1243 return hr->containing_set() == &_free_list; |
1244 } | |
342 | 1245 |
2361 | 1246 bool is_in_humongous_set(HeapRegion* hr) { |
2152 | 1247 return hr->containing_set() == &_humongous_set; |
2361 | 1248 } |
2152 | 1249 #endif // ASSERT |
342 | 1250 |
2152 | 1251 // Wrapper for the region list operations that can be called from |
1252 // methods outside this class. | |
342 | 1253 |
2152 | 1254 void secondary_free_list_add_as_tail(FreeRegionList* list) { |
1255 _secondary_free_list.add_as_tail(list); | |
1256 } | |
342 | 1257 |
2152 | 1258 void append_secondary_free_list() { |
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1259 _free_list.add_as_head(&_secondary_free_list); |
2152 | 1260 } |
342 | 1261 |
2361 | 1262 void append_secondary_free_list_if_not_empty_with_lock() { |
1263 // If the secondary free list looks empty there's no reason to | |
1264 // take the lock and then try to append it. | |
2152 | 1265 if (!_secondary_free_list.is_empty()) { |
1266 MutexLockerEx x(SecondaryFreeList_lock, Mutex::_no_safepoint_check_flag); | |
1267 append_secondary_free_list(); | |
1268 } | |
1269 } | |
342 | 1270 |
4072 | 1271 void old_set_remove(HeapRegion* hr) { |
1272 _old_set.remove(hr); | |
1273 } | |
1274 | |
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1275 size_t non_young_capacity_bytes() { |
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1276 return _old_set.total_capacity_bytes() + _humongous_set.total_capacity_bytes(); |
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1277 } |
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1278 |
2152 | 1279 void set_free_regions_coming(); |
1280 void reset_free_regions_coming(); | |
1281 bool free_regions_coming() { return _free_regions_coming; } | |
1282 void wait_while_free_regions_coming(); | |
342 | 1283 |
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1284 // Determine whether the given region is one that we are using as an |
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1285 // old GC alloc region. |
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1286 bool is_old_gc_alloc_region(HeapRegion* hr) { |
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1287 return hr == _retained_old_gc_alloc_region; |
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1288 } |
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1289 |
342 | 1290 // Perform a collection of the heap; intended for use in implementing |
1291 // "System.gc". This probably implies as full a collection as the | |
1292 // "CollectedHeap" supports. | |
1293 virtual void collect(GCCause::Cause cause); | |
1294 | |
1295 // The same as above but assume that the caller holds the Heap_lock. | |
1296 void collect_locked(GCCause::Cause cause); | |
1297 | |
10405 | 1298 // True iff an evacuation has failed in the most-recent collection. |
342 | 1299 bool evacuation_failed() { return _evacuation_failed; } |
1300 | |
2152 | 1301 // It will free a region if it has allocated objects in it that are |
1302 // all dead. It calls either free_region() or | |
1303 // free_humongous_region() depending on the type of the region that | |
1304 // is passed to it. | |
2173 | 1305 void free_region_if_empty(HeapRegion* hr, |
1306 size_t* pre_used, | |
1307 FreeRegionList* free_list, | |
4072 | 1308 OldRegionSet* old_proxy_set, |
2173 | 1309 HumongousRegionSet* humongous_proxy_set, |
1310 HRRSCleanupTask* hrrs_cleanup_task, | |
1311 bool par); | |
342 | 1312 |
2152 | 1313 // It appends the free list to the master free list and updates the |
1314 // master humongous list according to the contents of the proxy | |
1315 // list. It also adjusts the total used bytes according to pre_used | |
1316 // (if par is true, it will do so by taking the ParGCRareEvent_lock). | |
1317 void update_sets_after_freeing_regions(size_t pre_used, | |
1318 FreeRegionList* free_list, | |
4072 | 1319 OldRegionSet* old_proxy_set, |
2152 | 1320 HumongousRegionSet* humongous_proxy_set, |
1321 bool par); | |
342 | 1322 |
4708 | 1323 // Returns "TRUE" iff "p" points into the committed areas of the heap. |
342 | 1324 virtual bool is_in(const void* p) const; |
1325 | |
1326 // Return "TRUE" iff the given object address is within the collection | |
1327 // set. | |
1328 inline bool obj_in_cs(oop obj); | |
1329 | |
1330 // Return "TRUE" iff the given object address is in the reserved | |
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1331 // region of g1. |
342 | 1332 bool is_in_g1_reserved(const void* p) const { |
1333 return _g1_reserved.contains(p); | |
1334 } | |
1335 | |
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1336 // Returns a MemRegion that corresponds to the space that has been |
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1337 // reserved for the heap |
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1338 MemRegion g1_reserved() { |
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1339 return _g1_reserved; |
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1340 } |
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1341 |
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1342 // Returns a MemRegion that corresponds to the space that has been |
342 | 1343 // committed in the heap |
1344 MemRegion g1_committed() { | |
1345 return _g1_committed; | |
1346 } | |
1347 | |
2311 | 1348 virtual bool is_in_closed_subset(const void* p) const; |
342 | 1349 |
12343 | 1350 G1SATBCardTableModRefBS* g1_barrier_set() { |
1351 return (G1SATBCardTableModRefBS*) barrier_set(); | |
1352 } | |
1353 | |
342 | 1354 // This resets the card table to all zeros. It is used after |
1355 // a collection pause which used the card table to claim cards. | |
1356 void cleanUpCardTable(); | |
1357 | |
1358 // Iteration functions. | |
1359 | |
1360 // Iterate over all the ref-containing fields of all objects, calling | |
1361 // "cl.do_oop" on each. | |
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1362 virtual void oop_iterate(ExtendedOopClosure* cl); |
342 | 1363 |
1364 // Same as above, restricted to a memory region. | |
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1365 void oop_iterate(MemRegion mr, ExtendedOopClosure* cl); |
342 | 1366 |
1367 // Iterate over all objects, calling "cl.do_object" on each. | |
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1368 virtual void object_iterate(ObjectClosure* cl); |
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1369 |
678 | 1370 virtual void safe_object_iterate(ObjectClosure* cl) { |
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1371 object_iterate(cl); |
678 | 1372 } |
342 | 1373 |
1374 // Iterate over all spaces in use in the heap, in ascending address order. | |
1375 virtual void space_iterate(SpaceClosure* cl); | |
1376 | |
1377 // Iterate over heap regions, in address order, terminating the | |
1378 // iteration early if the "doHeapRegion" method returns "true". | |
3766 | 1379 void heap_region_iterate(HeapRegionClosure* blk) const; |
342 | 1380 |
3766 | 1381 // Return the region with the given index. It assumes the index is valid. |
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1382 HeapRegion* region_at(uint index) const { return _hrs.at(index); } |
342 | 1383 |
1384 // Divide the heap region sequence into "chunks" of some size (the number | |
1385 // of regions divided by the number of parallel threads times some | |
1386 // overpartition factor, currently 4). Assumes that this will be called | |
1387 // in parallel by ParallelGCThreads worker threads with discinct worker | |
1388 // ids in the range [0..max(ParallelGCThreads-1, 1)], that all parallel | |
1389 // calls will use the same "claim_value", and that that claim value is | |
1390 // different from the claim_value of any heap region before the start of | |
1391 // the iteration. Applies "blk->doHeapRegion" to each of the regions, by | |
1392 // attempting to claim the first region in each chunk, and, if | |
1393 // successful, applying the closure to each region in the chunk (and | |
1394 // setting the claim value of the second and subsequent regions of the | |
1395 // chunk.) For now requires that "doHeapRegion" always returns "false", | |
1396 // i.e., that a closure never attempt to abort a traversal. | |
1397 void heap_region_par_iterate_chunked(HeapRegionClosure* blk, | |
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1398 uint worker, |
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1399 uint no_of_par_workers, |
342 | 1400 jint claim_value); |
1401 | |
390 | 1402 // It resets all the region claim values to the default. |
1403 void reset_heap_region_claim_values(); | |
1404 | |
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1405 // Resets the claim values of regions in the current |
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1406 // collection set to the default. |
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1407 void reset_cset_heap_region_claim_values(); |
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1408 |
355 | 1409 #ifdef ASSERT |
1410 bool check_heap_region_claim_values(jint claim_value); | |
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1411 |
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1412 // Same as the routine above but only checks regions in the |
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1413 // current collection set. |
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1414 bool check_cset_heap_region_claim_values(jint claim_value); |
355 | 1415 #endif // ASSERT |
1416 | |
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1417 // Clear the cached cset start regions and (more importantly) |
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1418 // the time stamps. Called when we reset the GC time stamp. |
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1419 void clear_cset_start_regions(); |
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1420 |
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1421 // Given the id of a worker, obtain or calculate a suitable |
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1422 // starting region for iterating over the current collection set. |
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1423 HeapRegion* start_cset_region_for_worker(int worker_i); |
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1424 |
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1425 // This is a convenience method that is used by the |
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1426 // HeapRegionIterator classes to calculate the starting region for |
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1427 // each worker so that they do not all start from the same region. |
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1428 HeapRegion* start_region_for_worker(uint worker_i, uint no_of_par_workers); |
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1429 |
342 | 1430 // Iterate over the regions (if any) in the current collection set. |
1431 void collection_set_iterate(HeapRegionClosure* blk); | |
1432 | |
1433 // As above but starting from region r | |
1434 void collection_set_iterate_from(HeapRegion* r, HeapRegionClosure *blk); | |
1435 | |
1436 // Returns the first (lowest address) compactible space in the heap. | |
1437 virtual CompactibleSpace* first_compactible_space(); | |
1438 | |
1439 // A CollectedHeap will contain some number of spaces. This finds the | |
1440 // space containing a given address, or else returns NULL. | |
1441 virtual Space* space_containing(const void* addr) const; | |
1442 | |
1443 // A G1CollectedHeap will contain some number of heap regions. This | |
1444 // finds the region containing a given address, or else returns NULL. | |
3766 | 1445 template <class T> |
1446 inline HeapRegion* heap_region_containing(const T addr) const; | |
342 | 1447 |
1448 // Like the above, but requires "addr" to be in the heap (to avoid a | |
1449 // null-check), and unlike the above, may return an continuing humongous | |
1450 // region. | |
3766 | 1451 template <class T> |
1452 inline HeapRegion* heap_region_containing_raw(const T addr) const; | |
342 | 1453 |
1454 // A CollectedHeap is divided into a dense sequence of "blocks"; that is, | |
1455 // each address in the (reserved) heap is a member of exactly | |
1456 // one block. The defining characteristic of a block is that it is | |
1457 // possible to find its size, and thus to progress forward to the next | |
1458 // block. (Blocks may be of different sizes.) Thus, blocks may | |
1459 // represent Java objects, or they might be free blocks in a | |
1460 // free-list-based heap (or subheap), as long as the two kinds are | |
1461 // distinguishable and the size of each is determinable. | |
1462 | |
1463 // Returns the address of the start of the "block" that contains the | |
1464 // address "addr". We say "blocks" instead of "object" since some heaps | |
1465 // may not pack objects densely; a chunk may either be an object or a | |
1466 // non-object. | |
1467 virtual HeapWord* block_start(const void* addr) const; | |
1468 | |
1469 // Requires "addr" to be the start of a chunk, and returns its size. | |
1470 // "addr + size" is required to be the start of a new chunk, or the end | |
1471 // of the active area of the heap. | |
1472 virtual size_t block_size(const HeapWord* addr) const; | |
1473 | |
1474 // Requires "addr" to be the start of a block, and returns "TRUE" iff | |
1475 // the block is an object. | |
1476 virtual bool block_is_obj(const HeapWord* addr) const; | |
1477 | |
1478 // Does this heap support heap inspection? (+PrintClassHistogram) | |
1479 virtual bool supports_heap_inspection() const { return true; } | |
1480 | |
1481 // Section on thread-local allocation buffers (TLABs) | |
1482 // See CollectedHeap for semantics. | |
1483 | |
1484 virtual bool supports_tlab_allocation() const; | |
1485 virtual size_t tlab_capacity(Thread* thr) const; | |
1486 virtual size_t unsafe_max_tlab_alloc(Thread* thr) const; | |
1487 | |
1488 // Can a compiler initialize a new object without store barriers? | |
1489 // This permission only extends from the creation of a new object | |
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1490 // via a TLAB up to the first subsequent safepoint. If such permission |
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1491 // is granted for this heap type, the compiler promises to call |
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1492 // defer_store_barrier() below on any slow path allocation of |
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1493 // a new object for which such initializing store barriers will |
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1494 // have been elided. G1, like CMS, allows this, but should be |
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1495 // ready to provide a compensating write barrier as necessary |
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1496 // if that storage came out of a non-young region. The efficiency |
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1497 // of this implementation depends crucially on being able to |
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1498 // answer very efficiently in constant time whether a piece of |
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1499 // storage in the heap comes from a young region or not. |
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1500 // See ReduceInitialCardMarks. |
342 | 1501 virtual bool can_elide_tlab_store_barriers() const { |
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1502 return true; |
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1503 } |
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1504 |
1166 | 1505 virtual bool card_mark_must_follow_store() const { |
1506 return true; | |
1507 } | |
1508 | |
3766 | 1509 bool is_in_young(const oop obj) { |
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1510 HeapRegion* hr = heap_region_containing(obj); |
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1511 return hr != NULL && hr->is_young(); |
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1512 } |
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1513 |
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1514 #ifdef ASSERT |
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1515 virtual bool is_in_partial_collection(const void* p); |
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1516 #endif |
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1517 |
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1518 virtual bool is_scavengable(const void* addr); |
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1519 |
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1520 // We don't need barriers for initializing stores to objects |
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1521 // in the young gen: for the SATB pre-barrier, there is no |
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1522 // pre-value that needs to be remembered; for the remembered-set |
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1523 // update logging post-barrier, we don't maintain remembered set |
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1524 // information for young gen objects. |
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1525 virtual bool can_elide_initializing_store_barrier(oop new_obj) { |
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1526 return is_in_young(new_obj); |
342 | 1527 } |
1528 | |
1529 // Returns "true" iff the given word_size is "very large". | |
1530 static bool isHumongous(size_t word_size) { | |
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1531 // Note this has to be strictly greater-than as the TLABs |
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1532 // are capped at the humongous thresold and we want to |
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1533 // ensure that we don't try to allocate a TLAB as |
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1534 // humongous and that we don't allocate a humongous |
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1535 // object in a TLAB. |
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1536 return word_size > _humongous_object_threshold_in_words; |
342 | 1537 } |
1538 | |
1539 // Update mod union table with the set of dirty cards. | |
1540 void updateModUnion(); | |
1541 | |
1542 // Set the mod union bits corresponding to the given memRegion. Note | |
1543 // that this is always a safe operation, since it doesn't clear any | |
1544 // bits. | |
1545 void markModUnionRange(MemRegion mr); | |
1546 | |
1547 // Records the fact that a marking phase is no longer in progress. | |
1548 void set_marking_complete() { | |
1549 _mark_in_progress = false; | |
1550 } | |
1551 void set_marking_started() { | |
1552 _mark_in_progress = true; | |
1553 } | |
1554 bool mark_in_progress() { | |
1555 return _mark_in_progress; | |
1556 } | |
1557 | |
1558 // Print the maximum heap capacity. | |
1559 virtual size_t max_capacity() const; | |
1560 | |
1561 virtual jlong millis_since_last_gc(); | |
1562 | |
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1563 |
342 | 1564 // Convenience function to be used in situations where the heap type can be |
1565 // asserted to be this type. | |
1566 static G1CollectedHeap* heap(); | |
1567 | |
1568 void set_region_short_lived_locked(HeapRegion* hr); | |
1569 // add appropriate methods for any other surv rate groups | |
1570 | |
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1571 YoungList* young_list() { return _young_list; } |
342 | 1572 |
1573 // debugging | |
1574 bool check_young_list_well_formed() { | |
1575 return _young_list->check_list_well_formed(); | |
1576 } | |
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1577 |
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1578 bool check_young_list_empty(bool check_heap, |
342 | 1579 bool check_sample = true); |
1580 | |
1581 // *** Stuff related to concurrent marking. It's not clear to me that so | |
1582 // many of these need to be public. | |
1583 | |
1584 // The functions below are helper functions that a subclass of | |
1585 // "CollectedHeap" can use in the implementation of its virtual | |
1586 // functions. | |
1587 // This performs a concurrent marking of the live objects in a | |
1588 // bitmap off to the side. | |
1589 void doConcurrentMark(); | |
1590 | |
1591 bool isMarkedPrev(oop obj) const; | |
1592 bool isMarkedNext(oop obj) const; | |
1593 | |
1594 // Determine if an object is dead, given the object and also | |
1595 // the region to which the object belongs. An object is dead | |
1596 // iff a) it was not allocated since the last mark and b) it | |
1597 // is not marked. | |
1598 | |
1599 bool is_obj_dead(const oop obj, const HeapRegion* hr) const { | |
1600 return | |
1601 !hr->obj_allocated_since_prev_marking(obj) && | |
1602 !isMarkedPrev(obj); | |
1603 } | |
1604 | |
1605 // This function returns true when an object has been | |
1606 // around since the previous marking and hasn't yet | |
1607 // been marked during this marking. | |
1608 | |
1609 bool is_obj_ill(const oop obj, const HeapRegion* hr) const { | |
1610 return | |
1611 !hr->obj_allocated_since_next_marking(obj) && | |
1612 !isMarkedNext(obj); | |
1613 } | |
1614 | |
1615 // Determine if an object is dead, given only the object itself. | |
1616 // This will find the region to which the object belongs and | |
1617 // then call the region version of the same function. | |
1618 | |
1619 // Added if it is NULL it isn't dead. | |
1620 | |
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1621 bool is_obj_dead(const oop obj) const { |
811 | 1622 const HeapRegion* hr = heap_region_containing(obj); |
342 | 1623 if (hr == NULL) { |
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1624 if (obj == NULL) return false; |
342 | 1625 else return true; |
1626 } | |
1627 else return is_obj_dead(obj, hr); | |
1628 } | |
1629 | |
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1630 bool is_obj_ill(const oop obj) const { |
811 | 1631 const HeapRegion* hr = heap_region_containing(obj); |
342 | 1632 if (hr == NULL) { |
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1633 if (obj == NULL) return false; |
342 | 1634 else return true; |
1635 } | |
1636 else return is_obj_ill(obj, hr); | |
1637 } | |
1638 | |
12080 | 1639 bool allocated_since_marking(oop obj, HeapRegion* hr, VerifyOption vo); |
1640 HeapWord* top_at_mark_start(HeapRegion* hr, VerifyOption vo); | |
1641 bool is_marked(oop obj, VerifyOption vo); | |
1642 const char* top_at_mark_start_str(VerifyOption vo); | |
1643 | |
1644 ConcurrentMark* concurrent_mark() const { return _cm; } | |
1645 | |
1646 // Refinement | |
1647 | |
1648 ConcurrentG1Refine* concurrent_g1_refine() const { return _cg1r; } | |
1649 | |
1650 // The dirty cards region list is used to record a subset of regions | |
1651 // whose cards need clearing. The list if populated during the | |
1652 // remembered set scanning and drained during the card table | |
1653 // cleanup. Although the methods are reentrant, population/draining | |
1654 // phases must not overlap. For synchronization purposes the last | |
1655 // element on the list points to itself. | |
1656 HeapRegion* _dirty_cards_region_list; | |
1657 void push_dirty_cards_region(HeapRegion* hr); | |
1658 HeapRegion* pop_dirty_cards_region(); | |
1659 | |
1660 // Optimized nmethod scanning support routines | |
1661 | |
1662 // Register the given nmethod with the G1 heap | |
1663 virtual void register_nmethod(nmethod* nm); | |
1664 | |
1665 // Unregister the given nmethod from the G1 heap | |
1666 virtual void unregister_nmethod(nmethod* nm); | |
1667 | |
1668 // Migrate the nmethods in the code root lists of the regions | |
1669 // in the collection set to regions in to-space. In the event | |
1670 // of an evacuation failure, nmethods that reference objects | |
1671 // that were not successfullly evacuated are not migrated. | |
1672 void migrate_strong_code_roots(); | |
1673 | |
1674 // During an initial mark pause, mark all the code roots that | |
1675 // point into regions *not* in the collection set. | |
1676 void mark_strong_code_roots(uint worker_id); | |
1677 | |
1678 // Rebuild the stong code root lists for each region | |
1679 // after a full GC | |
1680 void rebuild_strong_code_roots(); | |
1681 | |
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1682 // Delete entries for dead interned string and clean up unreferenced symbols |
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1683 // in symbol table, possibly in parallel. |
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1684 void unlink_string_and_symbol_table(BoolObjectClosure* is_alive, bool unlink_strings = true, bool unlink_symbols = true); |
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1685 |
12080 | 1686 // Verification |
1687 | |
1688 // The following is just to alert the verification code | |
1689 // that a full collection has occurred and that the | |
1690 // remembered sets are no longer up to date. | |
1691 bool _full_collection; | |
1692 void set_full_collection() { _full_collection = true;} | |
1693 void clear_full_collection() {_full_collection = false;} | |
1694 bool full_collection() {return _full_collection;} | |
1695 | |
1696 // Perform any cleanup actions necessary before allowing a verification. | |
1697 virtual void prepare_for_verify(); | |
1698 | |
1699 // Perform verification. | |
1700 | |
1701 // vo == UsePrevMarking -> use "prev" marking information, | |
1702 // vo == UseNextMarking -> use "next" marking information | |
1703 // vo == UseMarkWord -> use the mark word in the object header | |
1704 // | |
1705 // NOTE: Only the "prev" marking information is guaranteed to be | |
1706 // consistent most of the time, so most calls to this should use | |
1707 // vo == UsePrevMarking. | |
1708 // Currently, there is only one case where this is called with | |
1709 // vo == UseNextMarking, which is to verify the "next" marking | |
1710 // information at the end of remark. | |
1711 // Currently there is only one place where this is called with | |
1712 // vo == UseMarkWord, which is to verify the marking during a | |
1713 // full GC. | |
1714 void verify(bool silent, VerifyOption vo); | |
1715 | |
1716 // Override; it uses the "prev" marking information | |
1717 virtual void verify(bool silent); | |
1718 | |
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1719 // The methods below are here for convenience and dispatch the |
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1720 // appropriate method depending on value of the given VerifyOption |
12080 | 1721 // parameter. The values for that parameter, and their meanings, |
1722 // are the same as those above. | |
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1723 |
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1724 bool is_obj_dead_cond(const oop obj, |
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1725 const HeapRegion* hr, |
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1726 const VerifyOption vo) const { |
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1727 switch (vo) { |
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1728 case VerifyOption_G1UsePrevMarking: return is_obj_dead(obj, hr); |
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1729 case VerifyOption_G1UseNextMarking: return is_obj_ill(obj, hr); |
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1730 case VerifyOption_G1UseMarkWord: return !obj->is_gc_marked(); |
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1731 default: ShouldNotReachHere(); |
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1732 } |
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1733 return false; // keep some compilers happy |
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1734 } |
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1735 |
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1736 bool is_obj_dead_cond(const oop obj, |
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1737 const VerifyOption vo) const { |
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1738 switch (vo) { |
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1739 case VerifyOption_G1UsePrevMarking: return is_obj_dead(obj); |
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1740 case VerifyOption_G1UseNextMarking: return is_obj_ill(obj); |
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1741 case VerifyOption_G1UseMarkWord: return !obj->is_gc_marked(); |
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1742 default: ShouldNotReachHere(); |
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1743 } |
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1744 return false; // keep some compilers happy |
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1745 } |
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1746 |
12080 | 1747 // Printing |
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1748 |
12080 | 1749 virtual void print_on(outputStream* st) const; |
1750 virtual void print_extended_on(outputStream* st) const; | |
1751 virtual void print_on_error(outputStream* st) const; | |
342 | 1752 |
12080 | 1753 virtual void print_gc_threads_on(outputStream* st) const; |
1754 virtual void gc_threads_do(ThreadClosure* tc) const; | |
342 | 1755 |
12080 | 1756 // Override |
1757 void print_tracing_info() const; | |
1758 | |
1759 // The following two methods are helpful for debugging RSet issues. | |
1760 void print_cset_rsets() PRODUCT_RETURN; | |
1761 void print_all_rsets() PRODUCT_RETURN; | |
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1762 |
342 | 1763 public: |
1764 void stop_conc_gc_threads(); | |
1765 | |
1766 size_t pending_card_num(); | |
1767 size_t cards_scanned(); | |
1768 | |
1769 protected: | |
1770 size_t _max_heap_capacity; | |
1771 }; | |
1772 | |
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1773 class G1ParGCAllocBuffer: public ParGCAllocBuffer { |
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1774 private: |
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1775 bool _retired; |
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1776 |
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1777 public: |
3886
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1778 G1ParGCAllocBuffer(size_t gclab_word_size); |
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1779 |
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1780 void set_buf(HeapWord* buf) { |
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1781 ParGCAllocBuffer::set_buf(buf); |
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1782 _retired = false; |
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1783 } |
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1784 |
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1785 void retire(bool end_of_gc, bool retain) { |
845
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1786 if (_retired) |
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1787 return; |
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1788 ParGCAllocBuffer::retire(end_of_gc, retain); |
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1789 _retired = true; |
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1790 } |
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1791 }; |
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1792 |
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1793 class G1ParScanThreadState : public StackObj { |
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1794 protected: |
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1795 G1CollectedHeap* _g1h; |
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1796 RefToScanQueue* _refs; |
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1797 DirtyCardQueue _dcq; |
12343 | 1798 G1SATBCardTableModRefBS* _ct_bs; |
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1799 G1RemSet* _g1_rem; |
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1800 |
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1801 G1ParGCAllocBuffer _surviving_alloc_buffer; |
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1802 G1ParGCAllocBuffer _tenured_alloc_buffer; |
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1803 G1ParGCAllocBuffer* _alloc_buffers[GCAllocPurposeCount]; |
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1804 ageTable _age_table; |
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1805 |
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1806 G1ParScanClosure _scanner; |
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1807 |
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1808 size_t _alloc_buffer_waste; |
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1809 size_t _undo_waste; |
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1810 |
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1811 OopsInHeapRegionClosure* _evac_failure_cl; |
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1812 G1ParScanHeapEvacClosure* _evac_cl; |
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1813 G1ParScanPartialArrayClosure* _partial_scan_cl; |
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1814 |
10405 | 1815 int _hash_seed; |
4836
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1816 uint _queue_num; |
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1817 |
1611 | 1818 size_t _term_attempts; |
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1819 |
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1820 double _start; |
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1821 double _start_strong_roots; |
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1822 double _strong_roots_time; |
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1823 double _start_term; |
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1824 double _term_time; |
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1825 |
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1826 // Map from young-age-index (0 == not young, 1 is youngest) to |
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1827 // surviving words. base is what we get back from the malloc call |
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1828 size_t* _surviving_young_words_base; |
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1829 // this points into the array, as we use the first few entries for padding |
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1830 size_t* _surviving_young_words; |
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1831 |
1709 | 1832 #define PADDING_ELEM_NUM (DEFAULT_CACHE_LINE_SIZE / sizeof(size_t)) |
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1833 |
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1834 void add_to_alloc_buffer_waste(size_t waste) { _alloc_buffer_waste += waste; } |
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1835 |
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1836 void add_to_undo_waste(size_t waste) { _undo_waste += waste; } |
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1837 |
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1838 DirtyCardQueue& dirty_card_queue() { return _dcq; } |
12343 | 1839 G1SATBCardTableModRefBS* ctbs() { return _ct_bs; } |
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1840 |
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1841 template <class T> void immediate_rs_update(HeapRegion* from, T* p, int tid) { |
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1842 if (!from->is_survivor()) { |
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1843 _g1_rem->par_write_ref(from, p, tid); |
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1844 } |
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1845 } |
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1846 |
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1847 template <class T> void deferred_rs_update(HeapRegion* from, T* p, int tid) { |
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1848 // If the new value of the field points to the same region or |
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1849 // is the to-space, we don't need to include it in the Rset updates. |
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1850 if (!from->is_in_reserved(oopDesc::load_decode_heap_oop(p)) && !from->is_survivor()) { |
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1851 size_t card_index = ctbs()->index_for(p); |
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1852 // If the card hasn't been added to the buffer, do it. |
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1853 if (ctbs()->mark_card_deferred(card_index)) { |
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1854 dirty_card_queue().enqueue((jbyte*)ctbs()->byte_for_index(card_index)); |
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1855 } |
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1856 } |
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1857 } |
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1858 |
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1859 public: |
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1860 G1ParScanThreadState(G1CollectedHeap* g1h, uint queue_num, ReferenceProcessor* rp); |
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1861 |
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1862 ~G1ParScanThreadState() { |
6197 | 1863 FREE_C_HEAP_ARRAY(size_t, _surviving_young_words_base, mtGC); |
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1864 } |
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1865 |
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1866 RefToScanQueue* refs() { return _refs; } |
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1867 ageTable* age_table() { return &_age_table; } |
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1868 |
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1869 G1ParGCAllocBuffer* alloc_buffer(GCAllocPurpose purpose) { |
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1870 return _alloc_buffers[purpose]; |
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1871 } |
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1872 |
1709 | 1873 size_t alloc_buffer_waste() const { return _alloc_buffer_waste; } |
1874 size_t undo_waste() const { return _undo_waste; } | |
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1875 |
1862
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1876 #ifdef ASSERT |
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1877 bool verify_ref(narrowOop* ref) const; |
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1878 bool verify_ref(oop* ref) const; |
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1879 bool verify_task(StarTask ref) const; |
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1880 #endif // ASSERT |
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1881 |
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1882 template <class T> void push_on_queue(T* ref) { |
1862
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1883 assert(verify_ref(ref), "sanity"); |
1709 | 1884 refs()->push(ref); |
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1885 } |
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1886 |
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1887 template <class T> void update_rs(HeapRegion* from, T* p, int tid) { |
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1888 if (G1DeferredRSUpdate) { |
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1889 deferred_rs_update(from, p, tid); |
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1890 } else { |
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1891 immediate_rs_update(from, p, tid); |
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1892 } |
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1893 } |
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1894 |
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1895 HeapWord* allocate_slow(GCAllocPurpose purpose, size_t word_sz) { |
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1896 HeapWord* obj = NULL; |
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1897 size_t gclab_word_size = _g1h->desired_plab_sz(purpose); |
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1898 if (word_sz * 100 < gclab_word_size * ParallelGCBufferWastePct) { |
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1899 G1ParGCAllocBuffer* alloc_buf = alloc_buffer(purpose); |
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1900 add_to_alloc_buffer_waste(alloc_buf->words_remaining()); |
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1901 alloc_buf->retire(false /* end_of_gc */, false /* retain */); |
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1902 |
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1903 HeapWord* buf = _g1h->par_allocate_during_gc(purpose, gclab_word_size); |
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1904 if (buf == NULL) return NULL; // Let caller handle allocation failure. |
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1905 // Otherwise. |
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1906 alloc_buf->set_word_size(gclab_word_size); |
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1907 alloc_buf->set_buf(buf); |
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1908 |
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1909 obj = alloc_buf->allocate(word_sz); |
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1910 assert(obj != NULL, "buffer was definitely big enough..."); |
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1911 } else { |
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1912 obj = _g1h->par_allocate_during_gc(purpose, word_sz); |
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1913 } |
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1914 return obj; |
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1915 } |
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1916 |
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1917 HeapWord* allocate(GCAllocPurpose purpose, size_t word_sz) { |
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1918 HeapWord* obj = alloc_buffer(purpose)->allocate(word_sz); |
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1919 if (obj != NULL) return obj; |
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1920 return allocate_slow(purpose, word_sz); |
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1921 } |
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1922 |
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1923 void undo_allocation(GCAllocPurpose purpose, HeapWord* obj, size_t word_sz) { |
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1924 if (alloc_buffer(purpose)->contains(obj)) { |
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1925 assert(alloc_buffer(purpose)->contains(obj + word_sz - 1), |
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1926 "should contain whole object"); |
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1927 alloc_buffer(purpose)->undo_allocation(obj, word_sz); |
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1928 } else { |
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1929 CollectedHeap::fill_with_object(obj, word_sz); |
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1930 add_to_undo_waste(word_sz); |
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1931 } |
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1932 } |
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1933 |
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1934 void set_evac_failure_closure(OopsInHeapRegionClosure* evac_failure_cl) { |
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1935 _evac_failure_cl = evac_failure_cl; |
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1936 } |
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1937 OopsInHeapRegionClosure* evac_failure_closure() { |
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1938 return _evac_failure_cl; |
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1939 } |
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1940 |
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1941 void set_evac_closure(G1ParScanHeapEvacClosure* evac_cl) { |
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1942 _evac_cl = evac_cl; |
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1943 } |
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1944 |
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1945 void set_partial_scan_closure(G1ParScanPartialArrayClosure* partial_scan_cl) { |
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1946 _partial_scan_cl = partial_scan_cl; |
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1947 } |
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1948 |
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1949 int* hash_seed() { return &_hash_seed; } |
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1950 uint queue_num() { return _queue_num; } |
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1951 |
1709 | 1952 size_t term_attempts() const { return _term_attempts; } |
1611 | 1953 void note_term_attempt() { _term_attempts++; } |
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1954 |
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1955 void start_strong_roots() { |
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1956 _start_strong_roots = os::elapsedTime(); |
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1957 } |
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1958 void end_strong_roots() { |
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1959 _strong_roots_time += (os::elapsedTime() - _start_strong_roots); |
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1960 } |
1709 | 1961 double strong_roots_time() const { return _strong_roots_time; } |
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1962 |
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1963 void start_term_time() { |
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1964 note_term_attempt(); |
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1965 _start_term = os::elapsedTime(); |
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1966 } |
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1967 void end_term_time() { |
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1968 _term_time += (os::elapsedTime() - _start_term); |
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1969 } |
1709 | 1970 double term_time() const { return _term_time; } |
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1971 |
1709 | 1972 double elapsed_time() const { |
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1973 return os::elapsedTime() - _start; |
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1974 } |
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1975 |
1709 | 1976 static void |
1977 print_termination_stats_hdr(outputStream* const st = gclog_or_tty); | |
1978 void | |
1979 print_termination_stats(int i, outputStream* const st = gclog_or_tty) const; | |
1980 | |
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1981 size_t* surviving_young_words() { |
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1982 // We add on to hide entry 0 which accumulates surviving words for |
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1983 // age -1 regions (i.e. non-young ones) |
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1984 return _surviving_young_words; |
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1985 } |
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1986 |
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1987 void retire_alloc_buffers() { |
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1988 for (int ap = 0; ap < GCAllocPurposeCount; ++ap) { |
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1989 size_t waste = _alloc_buffers[ap]->words_remaining(); |
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1990 add_to_alloc_buffer_waste(waste); |
6595 | 1991 _alloc_buffers[ap]->flush_stats_and_retire(_g1h->stats_for_purpose((GCAllocPurpose)ap), |
1992 true /* end_of_gc */, | |
1993 false /* retain */); | |
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1994 } |
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1995 } |
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1996 |
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1997 oop copy_to_survivor_space(oop const obj); |
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1998 |
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1999 template <class T> void deal_with_reference(T* ref_to_scan) { |
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2000 if (has_partial_array_mask(ref_to_scan)) { |
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2001 _partial_scan_cl->do_oop_nv(ref_to_scan); |
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2002 } else { |
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2003 // Note: we can use "raw" versions of "region_containing" because |
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2004 // "obj_to_scan" is definitely in the heap, and is not in a |
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2005 // humongous region. |
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2006 HeapRegion* r = _g1h->heap_region_containing_raw(ref_to_scan); |
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2007 _evac_cl->set_region(r); |
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2008 _evac_cl->do_oop_nv(ref_to_scan); |
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2009 } |
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2010 } |
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2011 |
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2012 void deal_with_reference(StarTask ref) { |
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2013 assert(verify_task(ref), "sanity"); |
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2014 if (ref.is_narrow()) { |
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2015 deal_with_reference((narrowOop*)ref); |
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2016 } else { |
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2017 deal_with_reference((oop*)ref); |
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2018 } |
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2019 } |
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2020 |
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2021 public: |
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2022 void trim_queue(); |
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2023 }; |
1972 | 2024 |
2025 #endif // SHARE_VM_GC_IMPLEMENTATION_G1_G1COLLECTEDHEAP_HPP |