Mercurial > hg > graal-compiler
annotate src/share/vm/gc_implementation/g1/g1CollectedHeap.hpp @ 20336:6701abbc4441
8054818: Refactor HeapRegionSeq to manage heap region and auxiliary data
Summary: Let HeapRegionSeq manage the heap region and auxiliary data to decrease the amount of responsibilities of G1CollectedHeap, and encapsulate this work from other code.
Reviewed-by: jwilhelm, jmasa, mgerdin, brutisso
author | tschatzl |
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date | Tue, 19 Aug 2014 10:50:27 +0200 |
parents | eec72fa4b108 |
children | 1f1d373cd044 |
rev | line source |
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342 | 1 /* |
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2 * Copyright (c) 2001, 2014, Oracle and/or its affiliates. All rights reserved. |
342 | 3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
4 * | |
5 * This code is free software; you can redistribute it and/or modify it | |
6 * under the terms of the GNU General Public License version 2 only, as | |
7 * published by the Free Software Foundation. | |
8 * | |
9 * This code is distributed in the hope that it will be useful, but WITHOUT | |
10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or | |
11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License | |
12 * version 2 for more details (a copy is included in the LICENSE file that | |
13 * accompanied this code). | |
14 * | |
15 * You should have received a copy of the GNU General Public License version | |
16 * 2 along with this work; if not, write to the Free Software Foundation, | |
17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. | |
18 * | |
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19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
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20 * or visit www.oracle.com if you need additional information or have any |
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21 * questions. |
342 | 22 * |
23 */ | |
24 | |
1972 | 25 #ifndef SHARE_VM_GC_IMPLEMENTATION_G1_G1COLLECTEDHEAP_HPP |
26 #define SHARE_VM_GC_IMPLEMENTATION_G1_G1COLLECTEDHEAP_HPP | |
27 | |
28 #include "gc_implementation/g1/concurrentMark.hpp" | |
10405 | 29 #include "gc_implementation/g1/evacuationInfo.hpp" |
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30 #include "gc_implementation/g1/g1AllocRegion.hpp" |
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31 #include "gc_implementation/g1/g1BiasedArray.hpp" |
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32 #include "gc_implementation/g1/g1HRPrinter.hpp" |
10405 | 33 #include "gc_implementation/g1/g1MonitoringSupport.hpp" |
12343 | 34 #include "gc_implementation/g1/g1SATBCardTableModRefBS.hpp" |
10405 | 35 #include "gc_implementation/g1/g1YCTypes.hpp" |
3766 | 36 #include "gc_implementation/g1/heapRegionSeq.hpp" |
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37 #include "gc_implementation/g1/heapRegionSet.hpp" |
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38 #include "gc_implementation/shared/hSpaceCounters.hpp" |
6595 | 39 #include "gc_implementation/shared/parGCAllocBuffer.hpp" |
1972 | 40 #include "memory/barrierSet.hpp" |
41 #include "memory/memRegion.hpp" | |
42 #include "memory/sharedHeap.hpp" | |
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43 #include "utilities/stack.hpp" |
1972 | 44 |
342 | 45 // A "G1CollectedHeap" is an implementation of a java heap for HotSpot. |
46 // It uses the "Garbage First" heap organization and algorithm, which | |
47 // may combine concurrent marking with parallel, incremental compaction of | |
48 // heap subsets that will yield large amounts of garbage. | |
49 | |
12080 | 50 // Forward declarations |
342 | 51 class HeapRegion; |
2173 | 52 class HRRSCleanupTask; |
342 | 53 class GenerationSpec; |
54 class OopsInHeapRegionClosure; | |
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55 class G1KlassScanClosure; |
342 | 56 class G1ScanHeapEvacClosure; |
57 class ObjectClosure; | |
58 class SpaceClosure; | |
59 class CompactibleSpaceClosure; | |
60 class Space; | |
61 class G1CollectorPolicy; | |
62 class GenRemSet; | |
63 class G1RemSet; | |
64 class HeapRegionRemSetIterator; | |
65 class ConcurrentMark; | |
66 class ConcurrentMarkThread; | |
67 class ConcurrentG1Refine; | |
10405 | 68 class ConcurrentGCTimer; |
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69 class GenerationCounters; |
10405 | 70 class STWGCTimer; |
71 class G1NewTracer; | |
72 class G1OldTracer; | |
73 class EvacuationFailedInfo; | |
12080 | 74 class nmethod; |
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75 class Ticks; |
342 | 76 |
6197 | 77 typedef OverflowTaskQueue<StarTask, mtGC> RefToScanQueue; |
78 typedef GenericTaskQueueSet<RefToScanQueue, mtGC> RefToScanQueueSet; | |
342 | 79 |
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80 typedef int RegionIdx_t; // needs to hold [ 0..max_regions() ) |
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81 typedef int CardIdx_t; // needs to hold [ 0..CardsPerRegion ) |
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82 |
342 | 83 enum GCAllocPurpose { |
84 GCAllocForTenured, | |
85 GCAllocForSurvived, | |
86 GCAllocPurposeCount | |
87 }; | |
88 | |
6197 | 89 class YoungList : public CHeapObj<mtGC> { |
342 | 90 private: |
91 G1CollectedHeap* _g1h; | |
92 | |
93 HeapRegion* _head; | |
94 | |
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95 HeapRegion* _survivor_head; |
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96 HeapRegion* _survivor_tail; |
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97 |
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98 HeapRegion* _curr; |
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99 |
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100 uint _length; |
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101 uint _survivor_length; |
342 | 102 |
103 size_t _last_sampled_rs_lengths; | |
104 size_t _sampled_rs_lengths; | |
105 | |
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106 void empty_list(HeapRegion* list); |
342 | 107 |
108 public: | |
109 YoungList(G1CollectedHeap* g1h); | |
110 | |
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111 void push_region(HeapRegion* hr); |
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112 void add_survivor_region(HeapRegion* hr); |
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113 |
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114 void empty_list(); |
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115 bool is_empty() { return _length == 0; } |
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116 uint length() { return _length; } |
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117 uint survivor_length() { return _survivor_length; } |
342 | 118 |
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119 // Currently we do not keep track of the used byte sum for the |
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120 // young list and the survivors and it'd be quite a lot of work to |
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121 // do so. When we'll eventually replace the young list with |
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122 // instances of HeapRegionLinkedList we'll get that for free. So, |
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123 // we'll report the more accurate information then. |
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124 size_t eden_used_bytes() { |
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125 assert(length() >= survivor_length(), "invariant"); |
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126 return (size_t) (length() - survivor_length()) * HeapRegion::GrainBytes; |
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127 } |
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128 size_t survivor_used_bytes() { |
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129 return (size_t) survivor_length() * HeapRegion::GrainBytes; |
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130 } |
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131 |
342 | 132 void rs_length_sampling_init(); |
133 bool rs_length_sampling_more(); | |
134 void rs_length_sampling_next(); | |
135 | |
136 void reset_sampled_info() { | |
137 _last_sampled_rs_lengths = 0; | |
138 } | |
139 size_t sampled_rs_lengths() { return _last_sampled_rs_lengths; } | |
140 | |
141 // for development purposes | |
142 void reset_auxilary_lists(); | |
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143 void clear() { _head = NULL; _length = 0; } |
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144 |
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145 void clear_survivors() { |
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146 _survivor_head = NULL; |
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147 _survivor_tail = NULL; |
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148 _survivor_length = 0; |
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149 } |
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150 |
342 | 151 HeapRegion* first_region() { return _head; } |
152 HeapRegion* first_survivor_region() { return _survivor_head; } | |
545 | 153 HeapRegion* last_survivor_region() { return _survivor_tail; } |
342 | 154 |
155 // debugging | |
156 bool check_list_well_formed(); | |
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157 bool check_list_empty(bool check_sample = true); |
342 | 158 void print(); |
159 }; | |
160 | |
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161 class MutatorAllocRegion : public G1AllocRegion { |
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162 protected: |
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163 virtual HeapRegion* allocate_new_region(size_t word_size, bool force); |
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164 virtual void retire_region(HeapRegion* alloc_region, size_t allocated_bytes); |
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165 public: |
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166 MutatorAllocRegion() |
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167 : G1AllocRegion("Mutator Alloc Region", false /* bot_updates */) { } |
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168 }; |
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169 |
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170 class SurvivorGCAllocRegion : public G1AllocRegion { |
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171 protected: |
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172 virtual HeapRegion* allocate_new_region(size_t word_size, bool force); |
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173 virtual void retire_region(HeapRegion* alloc_region, size_t allocated_bytes); |
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174 public: |
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175 SurvivorGCAllocRegion() |
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176 : G1AllocRegion("Survivor GC Alloc Region", false /* bot_updates */) { } |
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177 }; |
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178 |
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179 class OldGCAllocRegion : public G1AllocRegion { |
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180 protected: |
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181 virtual HeapRegion* allocate_new_region(size_t word_size, bool force); |
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182 virtual void retire_region(HeapRegion* alloc_region, size_t allocated_bytes); |
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183 public: |
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184 OldGCAllocRegion() |
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185 : G1AllocRegion("Old GC Alloc Region", true /* bot_updates */) { } |
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186 |
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187 // This specialization of release() makes sure that the last card that has been |
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188 // allocated into has been completely filled by a dummy object. |
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189 // This avoids races when remembered set scanning wants to update the BOT of the |
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190 // last card in the retained old gc alloc region, and allocation threads |
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191 // allocating into that card at the same time. |
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192 virtual HeapRegion* release(); |
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193 }; |
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194 |
12080 | 195 // The G1 STW is alive closure. |
196 // An instance is embedded into the G1CH and used as the | |
197 // (optional) _is_alive_non_header closure in the STW | |
198 // reference processor. It is also extensively used during | |
199 // reference processing during STW evacuation pauses. | |
200 class G1STWIsAliveClosure: public BoolObjectClosure { | |
201 G1CollectedHeap* _g1; | |
202 public: | |
203 G1STWIsAliveClosure(G1CollectedHeap* g1) : _g1(g1) {} | |
204 bool do_object_b(oop p); | |
205 }; | |
206 | |
342 | 207 class RefineCardTableEntryClosure; |
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208 |
342 | 209 class G1CollectedHeap : public SharedHeap { |
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210 friend class VM_CollectForMetadataAllocation; |
342 | 211 friend class VM_G1CollectForAllocation; |
212 friend class VM_G1CollectFull; | |
213 friend class VM_G1IncCollectionPause; | |
214 friend class VMStructs; | |
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215 friend class MutatorAllocRegion; |
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216 friend class SurvivorGCAllocRegion; |
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217 friend class OldGCAllocRegion; |
342 | 218 |
219 // Closures used in implementation. | |
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220 template <G1Barrier barrier, G1Mark do_mark_object> |
5987 | 221 friend class G1ParCopyClosure; |
342 | 222 friend class G1IsAliveClosure; |
223 friend class G1EvacuateFollowersClosure; | |
224 friend class G1ParScanThreadState; | |
225 friend class G1ParScanClosureSuper; | |
226 friend class G1ParEvacuateFollowersClosure; | |
227 friend class G1ParTask; | |
228 friend class G1FreeGarbageRegionClosure; | |
229 friend class RefineCardTableEntryClosure; | |
230 friend class G1PrepareCompactClosure; | |
231 friend class RegionSorter; | |
2152 | 232 friend class RegionResetter; |
342 | 233 friend class CountRCClosure; |
234 friend class EvacPopObjClosure; | |
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235 friend class G1ParCleanupCTTask; |
342 | 236 |
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237 friend class G1FreeHumongousRegionClosure; |
342 | 238 // Other related classes. |
239 friend class G1MarkSweep; | |
240 | |
241 private: | |
242 // The one and only G1CollectedHeap, so static functions can find it. | |
243 static G1CollectedHeap* _g1h; | |
244 | |
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245 static size_t _humongous_object_threshold_in_words; |
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246 |
2152 | 247 // The secondary free list which contains regions that have been |
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248 // freed up during the cleanup process. This will be appended to |
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249 // the master free list when appropriate. |
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250 FreeRegionList _secondary_free_list; |
2152 | 251 |
4072 | 252 // It keeps track of the old regions. |
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253 HeapRegionSet _old_set; |
4072 | 254 |
2152 | 255 // It keeps track of the humongous regions. |
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256 HeapRegionSet _humongous_set; |
342 | 257 |
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258 void clear_humongous_is_live_table(); |
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259 void eagerly_reclaim_humongous_regions(); |
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260 |
342 | 261 // The number of regions we could create by expansion. |
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262 uint _expansion_regions; |
342 | 263 |
264 // The block offset table for the G1 heap. | |
265 G1BlockOffsetSharedArray* _bot_shared; | |
266 | |
4072 | 267 // Tears down the region sets / lists so that they are empty and the |
268 // regions on the heap do not belong to a region set / list. The | |
269 // only exception is the humongous set which we leave unaltered. If | |
270 // free_list_only is true, it will only tear down the master free | |
271 // list. It is called before a Full GC (free_list_only == false) or | |
272 // before heap shrinking (free_list_only == true). | |
273 void tear_down_region_sets(bool free_list_only); | |
274 | |
275 // Rebuilds the region sets / lists so that they are repopulated to | |
276 // reflect the contents of the heap. The only exception is the | |
277 // humongous set which was not torn down in the first place. If | |
278 // free_list_only is true, it will only rebuild the master free | |
279 // list. It is called after a Full GC (free_list_only == false) or | |
280 // after heap shrinking (free_list_only == true). | |
281 void rebuild_region_sets(bool free_list_only); | |
342 | 282 |
283 // The sequence of all heap regions in the heap. | |
3766 | 284 HeapRegionSeq _hrs; |
342 | 285 |
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286 // Alloc region used to satisfy mutator allocation requests. |
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287 MutatorAllocRegion _mutator_alloc_region; |
342 | 288 |
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289 // Alloc region used to satisfy allocation requests by the GC for |
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290 // survivor objects. |
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291 SurvivorGCAllocRegion _survivor_gc_alloc_region; |
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292 |
6595 | 293 // PLAB sizing policy for survivors. |
294 PLABStats _survivor_plab_stats; | |
295 | |
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296 // Alloc region used to satisfy allocation requests by the GC for |
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297 // old objects. |
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298 OldGCAllocRegion _old_gc_alloc_region; |
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299 |
6595 | 300 // PLAB sizing policy for tenured objects. |
301 PLABStats _old_plab_stats; | |
302 | |
303 PLABStats* stats_for_purpose(GCAllocPurpose purpose) { | |
304 PLABStats* stats = NULL; | |
305 | |
306 switch (purpose) { | |
307 case GCAllocForSurvived: | |
308 stats = &_survivor_plab_stats; | |
309 break; | |
310 case GCAllocForTenured: | |
311 stats = &_old_plab_stats; | |
312 break; | |
313 default: | |
314 assert(false, "unrecognized GCAllocPurpose"); | |
315 } | |
316 | |
317 return stats; | |
318 } | |
319 | |
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320 // The last old region we allocated to during the last GC. |
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321 // Typically, it is not full so we should re-use it during the next GC. |
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322 HeapRegion* _retained_old_gc_alloc_region; |
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323 |
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324 // It specifies whether we should attempt to expand the heap after a |
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325 // region allocation failure. If heap expansion fails we set this to |
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326 // false so that we don't re-attempt the heap expansion (it's likely |
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327 // that subsequent expansion attempts will also fail if one fails). |
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328 // Currently, it is only consulted during GC and it's reset at the |
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329 // start of each GC. |
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330 bool _expand_heap_after_alloc_failure; |
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331 |
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332 // It resets the mutator alloc region before new allocations can take place. |
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333 void init_mutator_alloc_region(); |
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334 |
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335 // It releases the mutator alloc region. |
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336 void release_mutator_alloc_region(); |
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337 |
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338 // It initializes the GC alloc regions at the start of a GC. |
10405 | 339 void init_gc_alloc_regions(EvacuationInfo& evacuation_info); |
342 | 340 |
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341 // Setup the retained old gc alloc region as the currrent old gc alloc region. |
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342 void use_retained_old_gc_alloc_region(EvacuationInfo& evacuation_info); |
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343 |
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344 // It releases the GC alloc regions at the end of a GC. |
10405 | 345 void release_gc_alloc_regions(uint no_of_gc_workers, EvacuationInfo& evacuation_info); |
342 | 346 |
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347 // It does any cleanup that needs to be done on the GC alloc regions |
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348 // before a Full GC. |
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349 void abandon_gc_alloc_regions(); |
342 | 350 |
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351 // Helper for monitoring and management support. |
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352 G1MonitoringSupport* _g1mm; |
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353 |
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354 // Determines PLAB size for a particular allocation purpose. |
6595 | 355 size_t desired_plab_sz(GCAllocPurpose purpose); |
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356 |
342 | 357 // Outside of GC pauses, the number of bytes used in all regions other |
358 // than the current allocation region. | |
359 size_t _summary_bytes_used; | |
360 | |
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361 // Records whether the region at the given index is kept live by roots or |
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362 // references from the young generation. |
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363 class HumongousIsLiveBiasedMappedArray : public G1BiasedMappedArray<bool> { |
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364 protected: |
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365 bool default_value() const { return false; } |
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366 public: |
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367 void clear() { G1BiasedMappedArray<bool>::clear(); } |
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368 void set_live(uint region) { |
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369 set_by_index(region, true); |
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370 } |
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371 bool is_live(uint region) { |
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372 return get_by_index(region); |
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373 } |
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374 }; |
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375 |
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376 HumongousIsLiveBiasedMappedArray _humongous_is_live; |
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377 // Stores whether during humongous object registration we found candidate regions. |
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378 // If not, we can skip a few steps. |
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379 bool _has_humongous_reclaim_candidates; |
526 | 380 |
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381 volatile unsigned _gc_time_stamp; |
342 | 382 |
383 size_t* _surviving_young_words; | |
384 | |
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385 G1HRPrinter _hr_printer; |
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386 |
342 | 387 void setup_surviving_young_words(); |
388 void update_surviving_young_words(size_t* surv_young_words); | |
389 void cleanup_surviving_young_words(); | |
390 | |
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391 // It decides whether an explicit GC should start a concurrent cycle |
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392 // instead of doing a STW GC. Currently, a concurrent cycle is |
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393 // explicitly started if: |
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394 // (a) cause == _gc_locker and +GCLockerInvokesConcurrent, or |
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395 // (b) cause == _java_lang_system_gc and +ExplicitGCInvokesConcurrent. |
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396 // (c) cause == _g1_humongous_allocation |
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397 bool should_do_concurrent_full_gc(GCCause::Cause cause); |
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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 started. |
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401 volatile unsigned int _old_marking_cycles_started; |
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402 |
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403 // Keeps track of how many "old marking cycles" (i.e., Full GCs or |
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404 // concurrent cycles) we have completed. |
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405 volatile unsigned int _old_marking_cycles_completed; |
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406 |
10405 | 407 bool _concurrent_cycle_started; |
408 | |
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409 // This is a non-product method that is helpful for testing. It is |
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410 // called at the end of a GC and artificially expands the heap by |
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411 // allocating a number of dead regions. This way we can induce very |
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412 // frequent marking cycles and stress the cleanup / concurrent |
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413 // cleanup code more (as all the regions that will be allocated by |
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414 // this method will be found dead by the marking cycle). |
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415 void allocate_dummy_regions() PRODUCT_RETURN; |
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416 |
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417 // Clear RSets after a compaction. It also resets the GC time stamps. |
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418 void clear_rsets_post_compaction(); |
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419 |
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420 // If the HR printer is active, dump the state of the regions in the |
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421 // heap after a compaction. |
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422 void print_hrs_post_compaction(); |
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423 |
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424 double verify(bool guard, const char* msg); |
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425 void verify_before_gc(); |
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426 void verify_after_gc(); |
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427 |
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428 void log_gc_header(); |
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429 void log_gc_footer(double pause_time_sec); |
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430 |
1973 | 431 // These are macros so that, if the assert fires, we get the correct |
432 // line number, file, etc. | |
433 | |
2361 | 434 #define heap_locking_asserts_err_msg(_extra_message_) \ |
2152 | 435 err_msg("%s : Heap_lock locked: %s, at safepoint: %s, is VM thread: %s", \ |
2361 | 436 (_extra_message_), \ |
2152 | 437 BOOL_TO_STR(Heap_lock->owned_by_self()), \ |
438 BOOL_TO_STR(SafepointSynchronize::is_at_safepoint()), \ | |
439 BOOL_TO_STR(Thread::current()->is_VM_thread())) | |
1973 | 440 |
441 #define assert_heap_locked() \ | |
442 do { \ | |
443 assert(Heap_lock->owned_by_self(), \ | |
444 heap_locking_asserts_err_msg("should be holding the Heap_lock")); \ | |
445 } while (0) | |
446 | |
2361 | 447 #define assert_heap_locked_or_at_safepoint(_should_be_vm_thread_) \ |
1973 | 448 do { \ |
449 assert(Heap_lock->owned_by_self() || \ | |
2152 | 450 (SafepointSynchronize::is_at_safepoint() && \ |
2361 | 451 ((_should_be_vm_thread_) == Thread::current()->is_VM_thread())), \ |
1973 | 452 heap_locking_asserts_err_msg("should be holding the Heap_lock or " \ |
453 "should be at a safepoint")); \ | |
454 } while (0) | |
455 | |
456 #define assert_heap_locked_and_not_at_safepoint() \ | |
457 do { \ | |
458 assert(Heap_lock->owned_by_self() && \ | |
459 !SafepointSynchronize::is_at_safepoint(), \ | |
460 heap_locking_asserts_err_msg("should be holding the Heap_lock and " \ | |
461 "should not be at a safepoint")); \ | |
462 } while (0) | |
463 | |
464 #define assert_heap_not_locked() \ | |
465 do { \ | |
466 assert(!Heap_lock->owned_by_self(), \ | |
467 heap_locking_asserts_err_msg("should not be holding the Heap_lock")); \ | |
468 } while (0) | |
469 | |
470 #define assert_heap_not_locked_and_not_at_safepoint() \ | |
471 do { \ | |
472 assert(!Heap_lock->owned_by_self() && \ | |
473 !SafepointSynchronize::is_at_safepoint(), \ | |
474 heap_locking_asserts_err_msg("should not be holding the Heap_lock and " \ | |
475 "should not be at a safepoint")); \ | |
476 } while (0) | |
477 | |
2361 | 478 #define assert_at_safepoint(_should_be_vm_thread_) \ |
1973 | 479 do { \ |
2152 | 480 assert(SafepointSynchronize::is_at_safepoint() && \ |
2361 | 481 ((_should_be_vm_thread_) == Thread::current()->is_VM_thread()), \ |
1973 | 482 heap_locking_asserts_err_msg("should be at a safepoint")); \ |
483 } while (0) | |
484 | |
485 #define assert_not_at_safepoint() \ | |
486 do { \ | |
487 assert(!SafepointSynchronize::is_at_safepoint(), \ | |
488 heap_locking_asserts_err_msg("should not be at a safepoint")); \ | |
489 } while (0) | |
490 | |
342 | 491 protected: |
492 | |
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493 // The young region list. |
342 | 494 YoungList* _young_list; |
495 | |
496 // The current policy object for the collector. | |
497 G1CollectorPolicy* _g1_policy; | |
498 | |
2152 | 499 // This is the second level of trying to allocate a new region. If |
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500 // new_region() didn't find a region on the free_list, this call will |
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501 // check whether there's anything available on the |
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502 // secondary_free_list and/or wait for more regions to appear on |
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503 // that list, if _free_regions_coming is set. |
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504 HeapRegion* new_region_try_secondary_free_list(bool is_old); |
342 | 505 |
2361 | 506 // Try to allocate a single non-humongous HeapRegion sufficient for |
507 // an allocation of the given word_size. If do_expand is true, | |
508 // attempt to expand the heap if necessary to satisfy the allocation | |
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509 // request. If the region is to be used as an old region or for a |
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510 // humongous object, set is_old to true. If not, to false. |
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511 HeapRegion* new_region(size_t word_size, bool is_old, bool do_expand); |
342 | 512 |
2361 | 513 // Initialize a contiguous set of free regions of length num_regions |
514 // and starting at index first so that they appear as a single | |
515 // humongous region. | |
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516 HeapWord* humongous_obj_allocate_initialize_regions(uint first, |
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517 uint num_regions, |
2361 | 518 size_t word_size); |
519 | |
520 // Attempt to allocate a humongous object of the given size. Return | |
521 // NULL if unsuccessful. | |
2152 | 522 HeapWord* humongous_obj_allocate(size_t word_size); |
1973 | 523 |
524 // The following two methods, allocate_new_tlab() and | |
525 // mem_allocate(), are the two main entry points from the runtime | |
526 // into the G1's allocation routines. They have the following | |
527 // assumptions: | |
528 // | |
529 // * They should both be called outside safepoints. | |
530 // | |
531 // * They should both be called without holding the Heap_lock. | |
532 // | |
533 // * All allocation requests for new TLABs should go to | |
534 // allocate_new_tlab(). | |
535 // | |
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536 // * All non-TLAB allocation requests should go to mem_allocate(). |
1973 | 537 // |
538 // * If either call cannot satisfy the allocation request using the | |
539 // current allocating region, they will try to get a new one. If | |
540 // this fails, they will attempt to do an evacuation pause and | |
541 // retry the allocation. | |
542 // | |
543 // * If all allocation attempts fail, even after trying to schedule | |
544 // an evacuation pause, allocate_new_tlab() will return NULL, | |
545 // whereas mem_allocate() will attempt a heap expansion and/or | |
546 // schedule a Full GC. | |
547 // | |
548 // * We do not allow humongous-sized TLABs. So, allocate_new_tlab | |
549 // should never be called with word_size being humongous. All | |
550 // humongous allocation requests should go to mem_allocate() which | |
551 // will satisfy them with a special path. | |
552 | |
553 virtual HeapWord* allocate_new_tlab(size_t word_size); | |
554 | |
555 virtual HeapWord* mem_allocate(size_t word_size, | |
556 bool* gc_overhead_limit_was_exceeded); | |
342 | 557 |
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558 // The following three methods take a gc_count_before_ret |
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559 // parameter which is used to return the GC count if the method |
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560 // returns NULL. Given that we are required to read the GC count |
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561 // while holding the Heap_lock, and these paths will take the |
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562 // Heap_lock at some point, it's easier to get them to read the GC |
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563 // count while holding the Heap_lock before they return NULL instead |
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564 // of the caller (namely: mem_allocate()) having to also take the |
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565 // Heap_lock just to read the GC count. |
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566 |
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567 // First-level mutator allocation attempt: try to allocate out of |
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568 // the mutator alloc region without taking the Heap_lock. This |
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569 // should only be used for non-humongous allocations. |
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570 inline HeapWord* attempt_allocation(size_t word_size, |
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571 unsigned int* gc_count_before_ret, |
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572 int* gclocker_retry_count_ret); |
342 | 573 |
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574 // Second-level mutator allocation attempt: take the Heap_lock and |
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575 // retry the allocation attempt, potentially scheduling a GC |
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576 // pause. This should only be used for non-humongous allocations. |
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577 HeapWord* attempt_allocation_slow(size_t word_size, |
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578 unsigned int* gc_count_before_ret, |
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579 int* gclocker_retry_count_ret); |
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580 |
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581 // Takes the Heap_lock and attempts a humongous allocation. It can |
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582 // potentially schedule a GC pause. |
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583 HeapWord* attempt_allocation_humongous(size_t word_size, |
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584 unsigned int* gc_count_before_ret, |
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585 int* gclocker_retry_count_ret); |
1973 | 586 |
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587 // Allocation attempt that should be called during safepoints (e.g., |
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588 // at the end of a successful GC). expect_null_mutator_alloc_region |
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589 // specifies whether the mutator alloc region is expected to be NULL |
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590 // or not. |
1973 | 591 HeapWord* attempt_allocation_at_safepoint(size_t word_size, |
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592 bool expect_null_mutator_alloc_region); |
1973 | 593 |
594 // It dirties the cards that cover the block so that so that the post | |
595 // write barrier never queues anything when updating objects on this | |
596 // block. It is assumed (and in fact we assert) that the block | |
597 // belongs to a young region. | |
598 inline void dirty_young_block(HeapWord* start, size_t word_size); | |
342 | 599 |
600 // Allocate blocks during garbage collection. Will ensure an | |
601 // allocation region, either by picking one or expanding the | |
602 // heap, and then allocate a block of the given size. The block | |
603 // may not be a humongous - it must fit into a single heap region. | |
604 HeapWord* par_allocate_during_gc(GCAllocPurpose purpose, size_t word_size); | |
605 | |
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606 HeapWord* allocate_during_gc_slow(GCAllocPurpose purpose, |
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607 HeapRegion* alloc_region, |
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608 bool par, |
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609 size_t word_size); |
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610 |
342 | 611 // Ensure that no further allocations can happen in "r", bearing in mind |
612 // that parallel threads might be attempting allocations. | |
613 void par_allocate_remaining_space(HeapRegion* r); | |
614 | |
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615 // Allocation attempt during GC for a survivor object / PLAB. |
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616 inline HeapWord* survivor_attempt_allocation(size_t word_size); |
545 | 617 |
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618 // Allocation attempt during GC for an old object / PLAB. |
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619 inline HeapWord* old_attempt_allocation(size_t word_size); |
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620 |
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621 // These methods are the "callbacks" from the G1AllocRegion class. |
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622 |
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623 // For mutator alloc regions. |
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624 HeapRegion* new_mutator_alloc_region(size_t word_size, bool force); |
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625 void retire_mutator_alloc_region(HeapRegion* alloc_region, |
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626 size_t allocated_bytes); |
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627 |
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628 // For GC alloc regions. |
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629 HeapRegion* new_gc_alloc_region(size_t word_size, uint count, |
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630 GCAllocPurpose ap); |
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631 void retire_gc_alloc_region(HeapRegion* alloc_region, |
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632 size_t allocated_bytes, GCAllocPurpose ap); |
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633 |
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634 // - if explicit_gc is true, the GC is for a System.gc() or a heap |
1973 | 635 // inspection request and should collect the entire heap |
636 // - if clear_all_soft_refs is true, all soft references should be | |
637 // cleared during the GC | |
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638 // - if explicit_gc is false, word_size describes the allocation that |
1973 | 639 // the GC should attempt (at least) to satisfy |
640 // - it returns false if it is unable to do the collection due to the | |
641 // GC locker being active, true otherwise | |
642 bool do_collection(bool explicit_gc, | |
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643 bool clear_all_soft_refs, |
342 | 644 size_t word_size); |
645 | |
646 // Callback from VM_G1CollectFull operation. | |
647 // Perform a full collection. | |
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648 virtual void do_full_collection(bool clear_all_soft_refs); |
342 | 649 |
650 // Resize the heap if necessary after a full collection. If this is | |
651 // after a collect-for allocation, "word_size" is the allocation size, | |
652 // and will be considered part of the used portion of the heap. | |
653 void resize_if_necessary_after_full_collection(size_t word_size); | |
654 | |
655 // Callback from VM_G1CollectForAllocation operation. | |
656 // This function does everything necessary/possible to satisfy a | |
657 // failed allocation request (including collection, expansion, etc.) | |
1973 | 658 HeapWord* satisfy_failed_allocation(size_t word_size, bool* succeeded); |
342 | 659 |
660 // Attempting to expand the heap sufficiently | |
661 // to support an allocation of the given "word_size". If | |
662 // successful, perform the allocation and return the address of the | |
663 // allocated block, or else "NULL". | |
1973 | 664 HeapWord* expand_and_allocate(size_t word_size); |
342 | 665 |
3979
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666 // Process any reference objects discovered during |
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667 // an incremental evacuation pause. |
6819 | 668 void process_discovered_references(uint no_of_gc_workers); |
3979
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669 |
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670 // Enqueue any remaining discovered references |
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671 // after processing. |
6819 | 672 void enqueue_discovered_references(uint no_of_gc_workers); |
3979
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673 |
342 | 674 public: |
3289
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675 |
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676 G1MonitoringSupport* g1mm() { |
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677 assert(_g1mm != NULL, "should have been initialized"); |
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678 return _g1mm; |
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679 } |
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680 |
342 | 681 // Expand the garbage-first heap by at least the given size (in bytes!). |
2188
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682 // Returns true if the heap was expanded by the requested amount; |
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683 // false otherwise. |
342 | 684 // (Rounds up to a HeapRegion boundary.) |
2188
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685 bool expand(size_t expand_bytes); |
342 | 686 |
687 // Do anything common to GC's. | |
688 virtual void gc_prologue(bool full); | |
689 virtual void gc_epilogue(bool full); | |
690 | |
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691 inline void set_humongous_is_live(oop obj); |
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692 |
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693 bool humongous_is_live(uint region) { |
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694 return _humongous_is_live.is_live(region); |
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695 } |
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696 |
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697 // Returns whether the given region (which must be a humongous (start) region) |
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698 // is to be considered conservatively live regardless of any other conditions. |
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699 bool humongous_region_is_always_live(uint index); |
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700 // Register the given region to be part of the collection set. |
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701 inline void register_humongous_region_with_in_cset_fast_test(uint index); |
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702 // Register regions with humongous objects (actually on the start region) in |
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703 // the in_cset_fast_test table. |
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704 void register_humongous_regions_with_in_cset_fast_test(); |
526 | 705 // We register a region with the fast "in collection set" test. We |
706 // simply set to true the array slot corresponding to this region. | |
707 void register_region_with_in_cset_fast_test(HeapRegion* r) { | |
20305
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|
708 _in_cset_fast_test.set_in_cset(r->hrs_index()); |
526 | 709 } |
710 | |
711 // This is a fast test on whether a reference points into the | |
17688
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8035326: Assume non-NULL references in G1CollectedHeap::in_cset_fast_test
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712 // collection set or not. Assume that the reference |
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8035326: Assume non-NULL references in G1CollectedHeap::in_cset_fast_test
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713 // points into the heap. |
17833
bfdf528be8e8
8038498: Fix includes and C inlining after 8035330
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|
714 inline bool in_cset_fast_test(oop obj); |
526 | 715 |
1394
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716 void clear_cset_fast_test() { |
20212
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|
717 _in_cset_fast_test.clear(); |
1394
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718 } |
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719 |
6120
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7172388: G1: _total_full_collections should not be incremented for concurrent cycles
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|
720 // This is called at the start of either a concurrent cycle or a Full |
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|
721 // GC to update the number of old marking cycles started. |
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|
722 void increment_old_marking_cycles_started(); |
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723 |
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724 // This is called at the end of either a concurrent cycle or a Full |
6120
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|
725 // GC to update the number of old marking cycles completed. Those two |
1656
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|
726 // can happen in a nested fashion, i.e., we start a concurrent |
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|
727 // cycle, a Full GC happens half-way through it which ends first, |
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|
728 // and then the cycle notices that a Full GC happened and ends |
2030
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7000559: G1: assertion failure !outer || (full_collections_started == _full_collections_completed + 1)
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729 // too. The concurrent parameter is a boolean to help us do a bit |
fb712ff22571
7000559: G1: assertion failure !outer || (full_collections_started == _full_collections_completed + 1)
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diff
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|
730 // tighter consistency checking in the method. If concurrent is |
fb712ff22571
7000559: G1: assertion failure !outer || (full_collections_started == _full_collections_completed + 1)
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diff
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|
731 // false, the caller is the inner caller in the nesting (i.e., the |
fb712ff22571
7000559: G1: assertion failure !outer || (full_collections_started == _full_collections_completed + 1)
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|
732 // Full GC). If concurrent is true, the caller is the outer caller |
fb712ff22571
7000559: G1: assertion failure !outer || (full_collections_started == _full_collections_completed + 1)
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diff
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|
733 // in this nesting (i.e., the concurrent cycle). Further nesting is |
6120
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|
734 // not currently supported. The end of this call also notifies |
2030
fb712ff22571
7000559: G1: assertion failure !outer || (full_collections_started == _full_collections_completed + 1)
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diff
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|
735 // the FullGCCount_lock in case a Java thread is waiting for a full |
fb712ff22571
7000559: G1: assertion failure !outer || (full_collections_started == _full_collections_completed + 1)
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diff
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|
736 // GC to happen (e.g., it called System.gc() with |
1656
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|
737 // +ExplicitGCInvokesConcurrent). |
6120
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|
738 void increment_old_marking_cycles_completed(bool concurrent); |
1656
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|
739 |
6120
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diff
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|
740 unsigned int old_marking_cycles_completed() { |
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|
741 return _old_marking_cycles_completed; |
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|
742 } |
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diff
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|
743 |
13400
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8028128: Add a type safe alternative for working with counter based data
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12352
diff
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|
744 void register_concurrent_cycle_start(const Ticks& start_time); |
10405 | 745 void register_concurrent_cycle_end(); |
746 void trace_heap_after_concurrent_cycle(); | |
747 | |
748 G1YCType yc_type(); | |
749 | |
3778
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7049999: G1: Make the G1PrintHeapRegions output consistent and complete
tonyp
parents:
3777
diff
changeset
|
750 G1HRPrinter* hr_printer() { return &_hr_printer; } |
5f6f2615433a
7049999: G1: Make the G1PrintHeapRegions output consistent and complete
tonyp
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3777
diff
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|
751 |
17736
58fc1b1523dc
8034079: G1: Refactor the HeapRegionSet hierarchy
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17727
diff
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|
752 // Frees a non-humongous region by initializing its contents and |
58fc1b1523dc
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diff
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|
753 // adding it to the free list that's passed as a parameter (this is |
58fc1b1523dc
8034079: G1: Refactor the HeapRegionSet hierarchy
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|
754 // usually a local list which will be appended to the master free |
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8034079: G1: Refactor the HeapRegionSet hierarchy
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|
755 // list later). The used bytes of freed regions are accumulated in |
58fc1b1523dc
8034079: G1: Refactor the HeapRegionSet hierarchy
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|
756 // pre_used. If par is true, the region's RSet will not be freed |
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8034079: G1: Refactor the HeapRegionSet hierarchy
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diff
changeset
|
757 // up. The assumption is that this will be done later. |
17755
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diff
changeset
|
758 // The locked parameter indicates if the caller has already taken |
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diff
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|
759 // care of proper synchronization. This may allow some optimizations. |
17736
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|
760 void free_region(HeapRegion* hr, |
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|
761 FreeRegionList* free_list, |
17755
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|
762 bool par, |
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|
763 bool locked = false); |
17736
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|
764 |
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|
765 // Frees a humongous region by collapsing it into individual regions |
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|
766 // and calling free_region() for each of them. The freed regions |
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diff
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|
767 // will be added to the free list that's passed as a parameter (this |
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diff
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|
768 // is usually a local list which will be appended to the master free |
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|
769 // list later). The used bytes of freed regions are accumulated in |
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|
770 // pre_used. If par is true, the region's RSet will not be freed |
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771 // up. The assumption is that this will be done later. |
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|
772 void free_humongous_region(HeapRegion* hr, |
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773 FreeRegionList* free_list, |
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|
774 bool par); |
342 | 775 protected: |
776 | |
777 // Shrink the garbage-first heap by at most the given size (in bytes!). | |
778 // (Rounds down to a HeapRegion boundary.) | |
779 virtual void shrink(size_t expand_bytes); | |
780 void shrink_helper(size_t expand_bytes); | |
781 | |
1709 | 782 #if TASKQUEUE_STATS |
783 static void print_taskqueue_stats_hdr(outputStream* const st = gclog_or_tty); | |
784 void print_taskqueue_stats(outputStream* const st = gclog_or_tty) const; | |
785 void reset_taskqueue_stats(); | |
786 #endif // TASKQUEUE_STATS | |
787 | |
1973 | 788 // Schedule the VM operation that will do an evacuation pause to |
789 // satisfy an allocation request of word_size. *succeeded will | |
790 // return whether the VM operation was successful (it did do an | |
791 // evacuation pause) or not (another thread beat us to it or the GC | |
792 // locker was active). Given that we should not be holding the | |
793 // Heap_lock when we enter this method, we will pass the | |
794 // gc_count_before (i.e., total_collections()) as a parameter since | |
795 // it has to be read while holding the Heap_lock. Currently, both | |
796 // methods that call do_collection_pause() release the Heap_lock | |
797 // before the call, so it's easy to read gc_count_before just before. | |
12113
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798 HeapWord* do_collection_pause(size_t word_size, |
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|
799 unsigned int gc_count_before, |
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|
800 bool* succeeded, |
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|
801 GCCause::Cause gc_cause); |
342 | 802 |
803 // The guts of the incremental collection pause, executed by the vm | |
1973 | 804 // thread. It returns false if it is unable to do the collection due |
805 // to the GC locker being active, true otherwise | |
806 bool do_collection_pause_at_safepoint(double target_pause_time_ms); | |
342 | 807 |
808 // Actually do the work of evacuating the collection set. | |
10405 | 809 void evacuate_collection_set(EvacuationInfo& evacuation_info); |
342 | 810 |
811 // The g1 remembered set of the heap. | |
812 G1RemSet* _g1_rem_set; | |
813 | |
616
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6720309: G1: don't synchronously update RSet during evacuation pauses
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545
diff
changeset
|
814 // A set of cards that cover the objects for which the Rsets should be updated |
4f360ec815ba
6720309: G1: don't synchronously update RSet during evacuation pauses
iveresov
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545
diff
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|
815 // concurrently after the collection. |
4f360ec815ba
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parents:
545
diff
changeset
|
816 DirtyCardQueueSet _dirty_card_queue_set; |
4f360ec815ba
6720309: G1: don't synchronously update RSet during evacuation pauses
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|
817 |
342 | 818 // The closure used to refine a single card. |
819 RefineCardTableEntryClosure* _refine_cte_cl; | |
820 | |
821 // A function to check the consistency of dirty card logs. | |
822 void check_ct_logs_at_safepoint(); | |
823 | |
1705 | 824 // A DirtyCardQueueSet that is used to hold cards that contain |
825 // references into the current collection set. This is used to | |
826 // update the remembered sets of the regions in the collection | |
827 // set in the event of an evacuation failure. | |
828 DirtyCardQueueSet _into_cset_dirty_card_queue_set; | |
829 | |
342 | 830 // After a collection pause, make the regions in the CS into free |
831 // regions. | |
10405 | 832 void free_collection_set(HeapRegion* cs_head, EvacuationInfo& evacuation_info); |
342 | 833 |
1394
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|
834 // Abandon the current collection set without recording policy |
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|
835 // statistics or updating free lists. |
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diff
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|
836 void abandon_collection_set(HeapRegion* cs_head); |
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837 |
342 | 838 // Applies "scan_non_heap_roots" to roots outside the heap, |
839 // "scan_rs" to roots inside the heap (having done "set_region" to | |
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840 // indicate the region in which the root resides), |
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841 // and does "scan_metadata" If "scan_rs" is |
342 | 842 // NULL, then this step is skipped. The "worker_i" |
843 // param is for use with parallel roots processing, and should be | |
844 // the "i" of the calling parallel worker thread's work(i) function. | |
845 // In the sequential case this param will be ignored. | |
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846 void g1_process_roots(OopClosure* scan_non_heap_roots, |
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847 OopClosure* scan_non_heap_weak_roots, |
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848 OopsInHeapRegionClosure* scan_rs, |
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849 CLDClosure* scan_strong_clds, |
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850 CLDClosure* scan_weak_clds, |
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851 CodeBlobClosure* scan_strong_code, |
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852 uint worker_i); |
342 | 853 |
3766 | 854 // Notifies all the necessary spaces that the committed space has |
855 // been updated (either expanded or shrunk). It should be called | |
856 // after _g1_storage is updated. | |
857 void update_committed_space(HeapWord* old_end, HeapWord* new_end); | |
858 | |
342 | 859 // The concurrent marker (and the thread it runs in.) |
860 ConcurrentMark* _cm; | |
861 ConcurrentMarkThread* _cmThread; | |
862 bool _mark_in_progress; | |
863 | |
864 // The concurrent refiner. | |
865 ConcurrentG1Refine* _cg1r; | |
866 | |
867 // The parallel task queues | |
868 RefToScanQueueSet *_task_queues; | |
869 | |
870 // True iff a evacuation has failed in the current collection. | |
871 bool _evacuation_failed; | |
872 | |
10405 | 873 EvacuationFailedInfo* _evacuation_failed_info_array; |
342 | 874 |
875 // Failed evacuations cause some logical from-space objects to have | |
876 // forwarding pointers to themselves. Reset them. | |
877 void remove_self_forwarding_pointers(); | |
878 | |
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879 // Together, these store an object with a preserved mark, and its mark value. |
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880 Stack<oop, mtGC> _objs_with_preserved_marks; |
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881 Stack<markOop, mtGC> _preserved_marks_of_objs; |
342 | 882 |
883 // Preserve the mark of "obj", if necessary, in preparation for its mark | |
884 // word being overwritten with a self-forwarding-pointer. | |
885 void preserve_mark_if_necessary(oop obj, markOop m); | |
886 | |
887 // The stack of evac-failure objects left to be scanned. | |
888 GrowableArray<oop>* _evac_failure_scan_stack; | |
889 // The closure to apply to evac-failure objects. | |
890 | |
891 OopsInHeapRegionClosure* _evac_failure_closure; | |
892 // Set the field above. | |
893 void | |
894 set_evac_failure_closure(OopsInHeapRegionClosure* evac_failure_closure) { | |
895 _evac_failure_closure = evac_failure_closure; | |
896 } | |
897 | |
898 // Push "obj" on the scan stack. | |
899 void push_on_evac_failure_scan_stack(oop obj); | |
900 // Process scan stack entries until the stack is empty. | |
901 void drain_evac_failure_scan_stack(); | |
902 // True iff an invocation of "drain_scan_stack" is in progress; to | |
903 // prevent unnecessary recursion. | |
904 bool _drain_in_progress; | |
905 | |
906 // Do any necessary initialization for evacuation-failure handling. | |
907 // "cl" is the closure that will be used to process evac-failure | |
908 // objects. | |
909 void init_for_evac_failure(OopsInHeapRegionClosure* cl); | |
910 // Do any necessary cleanup for evacuation-failure handling data | |
911 // structures. | |
912 void finalize_for_evac_failure(); | |
913 | |
914 // An attempt to evacuate "obj" has failed; take necessary steps. | |
10405 | 915 oop handle_evacuation_failure_par(G1ParScanThreadState* _par_scan_state, oop obj); |
342 | 916 void handle_evacuation_failure_common(oop obj, markOop m); |
917 | |
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918 #ifndef PRODUCT |
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919 // Support for forcing evacuation failures. Analogous to |
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920 // PromotionFailureALot for the other collectors. |
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921 |
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922 // Records whether G1EvacuationFailureALot should be in effect |
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923 // for the current GC |
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924 bool _evacuation_failure_alot_for_current_gc; |
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925 |
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926 // Used to record the GC number for interval checking when |
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927 // determining whether G1EvaucationFailureALot is in effect |
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928 // for the current GC. |
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929 size_t _evacuation_failure_alot_gc_number; |
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930 |
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931 // Count of the number of evacuations between failures. |
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932 volatile size_t _evacuation_failure_alot_count; |
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933 |
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934 // Set whether G1EvacuationFailureALot should be in effect |
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935 // for the current GC (based upon the type of GC and which |
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936 // command line flags are set); |
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937 inline bool evacuation_failure_alot_for_gc_type(bool gcs_are_young, |
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938 bool during_initial_mark, |
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939 bool during_marking); |
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940 |
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941 inline void set_evacuation_failure_alot_for_current_gc(); |
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942 |
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943 // Return true if it's time to cause an evacuation failure. |
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944 inline bool evacuation_should_fail(); |
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945 |
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946 // Reset the G1EvacuationFailureALot counters. Should be called at |
10405 | 947 // the end of an evacuation pause in which an evacuation failure occurred. |
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948 inline void reset_evacuation_should_fail(); |
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949 #endif // !PRODUCT |
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950 |
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951 // ("Weak") Reference processing support. |
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952 // |
10405 | 953 // G1 has 2 instances of the reference processor class. One |
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954 // (_ref_processor_cm) handles reference object discovery |
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955 // and subsequent processing during concurrent marking cycles. |
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956 // |
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957 // The other (_ref_processor_stw) handles reference object |
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958 // discovery and processing during full GCs and incremental |
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959 // evacuation pauses. |
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960 // |
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961 // During an incremental pause, reference discovery will be |
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962 // temporarily disabled for _ref_processor_cm and will be |
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963 // enabled for _ref_processor_stw. At the end of the evacuation |
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964 // pause references discovered by _ref_processor_stw will be |
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965 // processed and discovery will be disabled. The previous |
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966 // setting for reference object discovery for _ref_processor_cm |
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967 // will be re-instated. |
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968 // |
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969 // At the start of marking: |
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970 // * Discovery by the CM ref processor is verified to be inactive |
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971 // and it's discovered lists are empty. |
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972 // * Discovery by the CM ref processor is then enabled. |
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973 // |
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974 // At the end of marking: |
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975 // * Any references on the CM ref processor's discovered |
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976 // lists are processed (possibly MT). |
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977 // |
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978 // At the start of full GC we: |
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979 // * Disable discovery by the CM ref processor and |
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980 // empty CM ref processor's discovered lists |
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981 // (without processing any entries). |
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982 // * Verify that the STW ref processor is inactive and it's |
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983 // discovered lists are empty. |
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984 // * Temporarily set STW ref processor discovery as single threaded. |
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985 // * Temporarily clear the STW ref processor's _is_alive_non_header |
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986 // field. |
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987 // * Finally enable discovery by the STW ref processor. |
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988 // |
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989 // The STW ref processor is used to record any discovered |
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990 // references during the full GC. |
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991 // |
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992 // At the end of a full GC we: |
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993 // * Enqueue any reference objects discovered by the STW ref processor |
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994 // that have non-live referents. This has the side-effect of |
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995 // making the STW ref processor inactive by disabling discovery. |
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996 // * Verify that the CM ref processor is still inactive |
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997 // and no references have been placed on it's discovered |
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998 // lists (also checked as a precondition during initial marking). |
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999 |
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1000 // The (stw) reference processor... |
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1001 ReferenceProcessor* _ref_processor_stw; |
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1002 |
10405 | 1003 STWGCTimer* _gc_timer_stw; |
1004 ConcurrentGCTimer* _gc_timer_cm; | |
1005 | |
1006 G1OldTracer* _gc_tracer_cm; | |
1007 G1NewTracer* _gc_tracer_stw; | |
1008 | |
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1009 // During reference object discovery, the _is_alive_non_header |
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1010 // closure (if non-null) is applied to the referent object to |
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1011 // determine whether the referent is live. If so then the |
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1012 // reference object does not need to be 'discovered' and can |
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1013 // be treated as a regular oop. This has the benefit of reducing |
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1014 // the number of 'discovered' reference objects that need to |
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1015 // be processed. |
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1016 // |
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1017 // Instance of the is_alive closure for embedding into the |
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1018 // STW reference processor as the _is_alive_non_header field. |
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1019 // Supplying a value for the _is_alive_non_header field is |
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1020 // optional but doing so prevents unnecessary additions to |
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1021 // the discovered lists during reference discovery. |
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1022 G1STWIsAliveClosure _is_alive_closure_stw; |
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1023 |
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1024 // The (concurrent marking) reference processor... |
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1025 ReferenceProcessor* _ref_processor_cm; |
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1026 |
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1027 // Instance of the concurrent mark is_alive closure for embedding |
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1028 // into the Concurrent Marking reference processor as the |
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1029 // _is_alive_non_header field. Supplying a value for the |
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1030 // _is_alive_non_header field is optional but doing so prevents |
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1031 // unnecessary additions to the discovered lists during reference |
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1032 // discovery. |
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1033 G1CMIsAliveClosure _is_alive_closure_cm; |
342 | 1034 |
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1035 // Cache used by G1CollectedHeap::start_cset_region_for_worker(). |
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1036 HeapRegion** _worker_cset_start_region; |
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1037 |
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1038 // Time stamp to validate the regions recorded in the cache |
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1039 // used by G1CollectedHeap::start_cset_region_for_worker(). |
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1040 // The heap region entry for a given worker is valid iff |
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1041 // the associated time stamp value matches the current value |
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1042 // of G1CollectedHeap::_gc_time_stamp. |
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1043 unsigned int* _worker_cset_start_region_time_stamp; |
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1044 |
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1045 enum G1H_process_roots_tasks { |
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1046 G1H_PS_filter_satb_buffers, |
342 | 1047 G1H_PS_refProcessor_oops_do, |
1048 // Leave this one last. | |
1049 G1H_PS_NumElements | |
1050 }; | |
1051 | |
1052 SubTasksDone* _process_strong_tasks; | |
1053 | |
2152 | 1054 volatile bool _free_regions_coming; |
342 | 1055 |
1056 public: | |
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1057 |
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1058 SubTasksDone* process_strong_tasks() { return _process_strong_tasks; } |
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1059 |
342 | 1060 void set_refine_cte_cl_concurrency(bool concurrent); |
1061 | |
1709 | 1062 RefToScanQueue *task_queue(int i) const; |
342 | 1063 |
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1064 // A set of cards where updates happened during the GC |
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1065 DirtyCardQueueSet& dirty_card_queue_set() { return _dirty_card_queue_set; } |
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1066 |
1705 | 1067 // A DirtyCardQueueSet that is used to hold cards that contain |
1068 // references into the current collection set. This is used to | |
1069 // update the remembered sets of the regions in the collection | |
1070 // set in the event of an evacuation failure. | |
1071 DirtyCardQueueSet& into_cset_dirty_card_queue_set() | |
1072 { return _into_cset_dirty_card_queue_set; } | |
1073 | |
342 | 1074 // Create a G1CollectedHeap with the specified policy. |
1075 // Must call the initialize method afterwards. | |
1076 // May not return if something goes wrong. | |
1077 G1CollectedHeap(G1CollectorPolicy* policy); | |
1078 | |
1079 // Initialize the G1CollectedHeap to have the initial and | |
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1080 // maximum sizes and remembered and barrier sets |
342 | 1081 // specified by the policy object. |
1082 jint initialize(); | |
1083 | |
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1084 virtual void stop(); |
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1085 |
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1086 // Return the (conservative) maximum heap alignment for any G1 heap |
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1087 static size_t conservative_max_heap_alignment(); |
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1088 |
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1089 // Initialize weak reference processing. |
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1090 virtual void ref_processing_init(); |
342 | 1091 |
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1092 void set_par_threads(uint t) { |
342 | 1093 SharedHeap::set_par_threads(t); |
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1094 // Done in SharedHeap but oddly there are |
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1095 // two _process_strong_tasks's in a G1CollectedHeap |
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1096 // so do it here too. |
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1097 _process_strong_tasks->set_n_threads(t); |
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1098 } |
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1099 |
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1100 // Set _n_par_threads according to a policy TBD. |
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1101 void set_par_threads(); |
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1102 |
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1103 void set_n_termination(int t) { |
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1104 _process_strong_tasks->set_n_threads(t); |
342 | 1105 } |
1106 | |
1107 virtual CollectedHeap::Name kind() const { | |
1108 return CollectedHeap::G1CollectedHeap; | |
1109 } | |
1110 | |
1111 // The current policy object for the collector. | |
1112 G1CollectorPolicy* g1_policy() const { return _g1_policy; } | |
1113 | |
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1114 virtual CollectorPolicy* collector_policy() const { return (CollectorPolicy*) g1_policy(); } |
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1115 |
342 | 1116 // Adaptive size policy. No such thing for g1. |
1117 virtual AdaptiveSizePolicy* size_policy() { return NULL; } | |
1118 | |
1119 // The rem set and barrier set. | |
1120 G1RemSet* g1_rem_set() const { return _g1_rem_set; } | |
1121 | |
1122 unsigned get_gc_time_stamp() { | |
1123 return _gc_time_stamp; | |
1124 } | |
1125 | |
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1126 inline void reset_gc_time_stamp(); |
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1127 |
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1128 void check_gc_time_stamps() PRODUCT_RETURN; |
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1129 |
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1130 inline void increment_gc_time_stamp(); |
342 | 1131 |
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1132 // Reset the given region's GC timestamp. If it's starts humongous, |
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1133 // also reset the GC timestamp of its corresponding |
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1134 // continues humongous regions too. |
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1135 void reset_gc_time_stamps(HeapRegion* hr); |
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1136 |
1705 | 1137 void iterate_dirty_card_closure(CardTableEntryClosure* cl, |
1138 DirtyCardQueue* into_cset_dcq, | |
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1139 bool concurrent, uint worker_i); |
342 | 1140 |
1141 // The shared block offset table array. | |
1142 G1BlockOffsetSharedArray* bot_shared() const { return _bot_shared; } | |
1143 | |
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1144 // Reference Processing accessors |
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1145 |
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1146 // The STW reference processor.... |
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1147 ReferenceProcessor* ref_processor_stw() const { return _ref_processor_stw; } |
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1148 |
10405 | 1149 // The Concurrent Marking reference processor... |
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1150 ReferenceProcessor* ref_processor_cm() const { return _ref_processor_cm; } |
342 | 1151 |
10405 | 1152 ConcurrentGCTimer* gc_timer_cm() const { return _gc_timer_cm; } |
1153 G1OldTracer* gc_tracer_cm() const { return _gc_tracer_cm; } | |
1154 | |
342 | 1155 virtual size_t capacity() const; |
1156 virtual size_t used() const; | |
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1157 // This should be called when we're not holding the heap lock. The |
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1158 // result might be a bit inaccurate. |
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1159 size_t used_unlocked() const; |
342 | 1160 size_t recalculate_used() const; |
1161 | |
1162 // These virtual functions do the actual allocation. | |
1163 // Some heaps may offer a contiguous region for shared non-blocking | |
1164 // allocation, via inlined code (by exporting the address of the top and | |
1165 // end fields defining the extent of the contiguous allocation region.) | |
1166 // But G1CollectedHeap doesn't yet support this. | |
1167 | |
1168 // Return an estimate of the maximum allocation that could be performed | |
1169 // without triggering any collection or expansion activity. In a | |
1170 // generational collector, for example, this is probably the largest | |
1171 // allocation that could be supported (without expansion) in the youngest | |
1172 // generation. It is "unsafe" because no locks are taken; the result | |
1173 // should be treated as an approximation, not a guarantee, for use in | |
1174 // heuristic resizing decisions. | |
1175 virtual size_t unsafe_max_alloc(); | |
1176 | |
1177 virtual bool is_maximal_no_gc() const { | |
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1178 return _hrs.available() == 0; |
342 | 1179 } |
1180 | |
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1181 // The current number of regions in the heap. |
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1182 uint num_regions() const { return _hrs.length(); } |
3766 | 1183 |
1184 // The max number of regions in the heap. | |
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1185 uint max_regions() const { return _hrs.max_length(); } |
342 | 1186 |
1187 // The number of regions that are completely free. | |
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1188 uint num_free_regions() const { return _hrs.num_free_regions(); } |
342 | 1189 |
1190 // The number of regions that are not completely free. | |
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1191 uint num_used_regions() const { return num_regions() - num_free_regions(); } |
3766 | 1192 |
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1193 void verify_not_dirty_region(HeapRegion* hr) PRODUCT_RETURN; |
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1194 void verify_dirty_region(HeapRegion* hr) PRODUCT_RETURN; |
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1195 void verify_dirty_young_list(HeapRegion* head) PRODUCT_RETURN; |
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1196 void verify_dirty_young_regions() PRODUCT_RETURN; |
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1197 |
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1198 #ifndef PRODUCT |
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1199 // Make sure that the given bitmap has no marked objects in the |
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1200 // range [from,limit). If it does, print an error message and return |
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1201 // false. Otherwise, just return true. bitmap_name should be "prev" |
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1202 // or "next". |
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1203 bool verify_no_bits_over_tams(const char* bitmap_name, CMBitMapRO* bitmap, |
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1204 HeapWord* from, HeapWord* limit); |
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1205 |
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1206 // Verify that the prev / next bitmap range [tams,end) for the given |
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1207 // region has no marks. Return true if all is well, false if errors |
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1208 // are detected. |
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1209 bool verify_bitmaps(const char* caller, HeapRegion* hr); |
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1210 #endif // PRODUCT |
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1211 |
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1212 // If G1VerifyBitmaps is set, verify that the marking bitmaps for |
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1213 // the given region do not have any spurious marks. If errors are |
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1214 // detected, print appropriate error messages and crash. |
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1215 void check_bitmaps(const char* caller, HeapRegion* hr) PRODUCT_RETURN; |
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1216 |
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1217 // If G1VerifyBitmaps is set, verify that the marking bitmaps do not |
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1218 // have any spurious marks. If errors are detected, print |
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1219 // appropriate error messages and crash. |
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1220 void check_bitmaps(const char* caller) PRODUCT_RETURN; |
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1221 |
2152 | 1222 // verify_region_sets() performs verification over the region |
1223 // lists. It will be compiled in the product code to be used when | |
1224 // necessary (i.e., during heap verification). | |
1225 void verify_region_sets(); | |
342 | 1226 |
2152 | 1227 // verify_region_sets_optional() is planted in the code for |
1228 // list verification in non-product builds (and it can be enabled in | |
10405 | 1229 // product builds by defining HEAP_REGION_SET_FORCE_VERIFY to be 1). |
2152 | 1230 #if HEAP_REGION_SET_FORCE_VERIFY |
1231 void verify_region_sets_optional() { | |
1232 verify_region_sets(); | |
1233 } | |
1234 #else // HEAP_REGION_SET_FORCE_VERIFY | |
1235 void verify_region_sets_optional() { } | |
1236 #endif // HEAP_REGION_SET_FORCE_VERIFY | |
342 | 1237 |
2152 | 1238 #ifdef ASSERT |
2361 | 1239 bool is_on_master_free_list(HeapRegion* hr) { |
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1240 return _hrs.is_free(hr); |
2152 | 1241 } |
1242 #endif // ASSERT | |
342 | 1243 |
2152 | 1244 // Wrapper for the region list operations that can be called from |
1245 // methods outside this class. | |
342 | 1246 |
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1247 void secondary_free_list_add(FreeRegionList* list) { |
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1248 _secondary_free_list.add_ordered(list); |
2152 | 1249 } |
342 | 1250 |
2152 | 1251 void append_secondary_free_list() { |
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1252 _hrs.insert_list_into_free_list(&_secondary_free_list); |
2152 | 1253 } |
342 | 1254 |
2361 | 1255 void append_secondary_free_list_if_not_empty_with_lock() { |
1256 // If the secondary free list looks empty there's no reason to | |
1257 // take the lock and then try to append it. | |
2152 | 1258 if (!_secondary_free_list.is_empty()) { |
1259 MutexLockerEx x(SecondaryFreeList_lock, Mutex::_no_safepoint_check_flag); | |
1260 append_secondary_free_list(); | |
1261 } | |
1262 } | |
342 | 1263 |
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1264 inline void old_set_remove(HeapRegion* hr); |
4072 | 1265 |
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1266 size_t non_young_capacity_bytes() { |
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1267 return _old_set.total_capacity_bytes() + _humongous_set.total_capacity_bytes(); |
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1268 } |
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1269 |
2152 | 1270 void set_free_regions_coming(); |
1271 void reset_free_regions_coming(); | |
1272 bool free_regions_coming() { return _free_regions_coming; } | |
1273 void wait_while_free_regions_coming(); | |
342 | 1274 |
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1275 // Determine whether the given region is one that we are using as an |
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1276 // old GC alloc region. |
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1277 bool is_old_gc_alloc_region(HeapRegion* hr) { |
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1278 return hr == _retained_old_gc_alloc_region; |
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1279 } |
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1280 |
342 | 1281 // Perform a collection of the heap; intended for use in implementing |
1282 // "System.gc". This probably implies as full a collection as the | |
1283 // "CollectedHeap" supports. | |
1284 virtual void collect(GCCause::Cause cause); | |
1285 | |
1286 // The same as above but assume that the caller holds the Heap_lock. | |
1287 void collect_locked(GCCause::Cause cause); | |
1288 | |
10405 | 1289 // True iff an evacuation has failed in the most-recent collection. |
342 | 1290 bool evacuation_failed() { return _evacuation_failed; } |
1291 | |
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1292 void remove_from_old_sets(const HeapRegionSetCount& old_regions_removed, const HeapRegionSetCount& humongous_regions_removed); |
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1293 void prepend_to_freelist(FreeRegionList* list); |
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1294 void decrement_summary_bytes(size_t bytes); |
342 | 1295 |
4708 | 1296 // Returns "TRUE" iff "p" points into the committed areas of the heap. |
342 | 1297 virtual bool is_in(const void* p) const; |
1298 | |
1299 // Return "TRUE" iff the given object address is within the collection | |
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1300 // set. Slow implementation. |
342 | 1301 inline bool obj_in_cs(oop obj); |
1302 | |
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1303 inline bool is_in_cset(oop obj); |
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1304 |
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1305 inline bool is_in_cset_or_humongous(const oop obj); |
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1306 |
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1307 enum in_cset_state_t { |
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1308 InNeither, // neither in collection set nor humongous |
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1309 InCSet, // region is in collection set only |
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1310 IsHumongous // region is a humongous start region |
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1311 }; |
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1312 private: |
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1313 // Instances of this class are used for quick tests on whether a reference points |
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1314 // into the collection set or is a humongous object (points into a humongous |
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1315 // object). |
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1316 // Each of the array's elements denotes whether the corresponding region is in |
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1317 // the collection set or a humongous region. |
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1318 // We use this to quickly reclaim humongous objects: by making a humongous region |
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1319 // succeed this test, we sort-of add it to the collection set. During the reference |
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1320 // iteration closures, when we see a humongous region, we simply mark it as |
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1321 // referenced, i.e. live. |
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1322 class G1FastCSetBiasedMappedArray : public G1BiasedMappedArray<char> { |
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1323 protected: |
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1324 char default_value() const { return G1CollectedHeap::InNeither; } |
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1325 public: |
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1326 void set_humongous(uintptr_t index) { |
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1327 assert(get_by_index(index) != InCSet, "Should not overwrite InCSet values"); |
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1328 set_by_index(index, G1CollectedHeap::IsHumongous); |
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1329 } |
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1330 |
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1331 void clear_humongous(uintptr_t index) { |
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1332 set_by_index(index, G1CollectedHeap::InNeither); |
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1333 } |
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1334 |
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1335 void set_in_cset(uintptr_t index) { |
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1336 assert(get_by_index(index) != G1CollectedHeap::IsHumongous, "Should not overwrite IsHumongous value"); |
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1337 set_by_index(index, G1CollectedHeap::InCSet); |
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1338 } |
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1339 |
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1340 bool is_in_cset_or_humongous(HeapWord* addr) const { return get_by_address(addr) != G1CollectedHeap::InNeither; } |
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1341 bool is_in_cset(HeapWord* addr) const { return get_by_address(addr) == G1CollectedHeap::InCSet; } |
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1342 G1CollectedHeap::in_cset_state_t at(HeapWord* addr) const { return (G1CollectedHeap::in_cset_state_t)get_by_address(addr); } |
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1343 void clear() { G1BiasedMappedArray<char>::clear(); } |
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1344 }; |
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1345 |
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1346 // This array is used for a quick test on whether a reference points into |
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1347 // the collection set or not. Each of the array's elements denotes whether the |
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1348 // corresponding region is in the collection set or not. |
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1349 G1FastCSetBiasedMappedArray _in_cset_fast_test; |
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1350 |
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1351 public: |
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1352 |
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1353 inline in_cset_state_t in_cset_state(const oop obj); |
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1354 |
342 | 1355 // Return "TRUE" iff the given object address is in the reserved |
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1356 // region of g1. |
342 | 1357 bool is_in_g1_reserved(const void* p) const { |
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1358 return _hrs.reserved().contains(p); |
342 | 1359 } |
1360 | |
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1361 // Returns a MemRegion that corresponds to the space that has been |
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1362 // reserved for the heap |
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1363 MemRegion g1_reserved() const { |
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1364 return _hrs.reserved(); |
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1365 } |
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1366 |
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1367 // Returns a MemRegion that corresponds to the space that has been |
342 | 1368 // committed in the heap |
1369 MemRegion g1_committed() { | |
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1370 return _hrs.committed(); |
342 | 1371 } |
1372 | |
2311 | 1373 virtual bool is_in_closed_subset(const void* p) const; |
342 | 1374 |
12343 | 1375 G1SATBCardTableModRefBS* g1_barrier_set() { |
1376 return (G1SATBCardTableModRefBS*) barrier_set(); | |
1377 } | |
1378 | |
342 | 1379 // This resets the card table to all zeros. It is used after |
1380 // a collection pause which used the card table to claim cards. | |
1381 void cleanUpCardTable(); | |
1382 | |
1383 // Iteration functions. | |
1384 | |
1385 // Iterate over all the ref-containing fields of all objects, calling | |
1386 // "cl.do_oop" on each. | |
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1387 virtual void oop_iterate(ExtendedOopClosure* cl); |
342 | 1388 |
1389 // Iterate over all objects, calling "cl.do_object" on each. | |
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1390 virtual void object_iterate(ObjectClosure* cl); |
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1391 |
678 | 1392 virtual void safe_object_iterate(ObjectClosure* cl) { |
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1393 object_iterate(cl); |
678 | 1394 } |
342 | 1395 |
1396 // Iterate over all spaces in use in the heap, in ascending address order. | |
1397 virtual void space_iterate(SpaceClosure* cl); | |
1398 | |
1399 // Iterate over heap regions, in address order, terminating the | |
1400 // iteration early if the "doHeapRegion" method returns "true". | |
3766 | 1401 void heap_region_iterate(HeapRegionClosure* blk) const; |
342 | 1402 |
3766 | 1403 // Return the region with the given index. It assumes the index is valid. |
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1404 inline HeapRegion* region_at(uint index) const; |
342 | 1405 |
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1406 // Calculate the region index of the given address. Given address must be |
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1407 // within the heap. |
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1408 inline uint addr_to_region(HeapWord* addr) const; |
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1409 |
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1410 inline HeapWord* bottom_addr_for_region(uint index) const; |
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1411 |
342 | 1412 // Divide the heap region sequence into "chunks" of some size (the number |
1413 // of regions divided by the number of parallel threads times some | |
1414 // overpartition factor, currently 4). Assumes that this will be called | |
1415 // in parallel by ParallelGCThreads worker threads with discinct worker | |
1416 // ids in the range [0..max(ParallelGCThreads-1, 1)], that all parallel | |
1417 // calls will use the same "claim_value", and that that claim value is | |
1418 // different from the claim_value of any heap region before the start of | |
1419 // the iteration. Applies "blk->doHeapRegion" to each of the regions, by | |
1420 // attempting to claim the first region in each chunk, and, if | |
1421 // successful, applying the closure to each region in the chunk (and | |
1422 // setting the claim value of the second and subsequent regions of the | |
1423 // chunk.) For now requires that "doHeapRegion" always returns "false", | |
1424 // i.e., that a closure never attempt to abort a traversal. | |
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1425 void heap_region_par_iterate_chunked(HeapRegionClosure* cl, |
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1426 uint worker_id, |
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1427 uint num_workers, |
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1428 jint claim_value) const; |
342 | 1429 |
390 | 1430 // It resets all the region claim values to the default. |
1431 void reset_heap_region_claim_values(); | |
1432 | |
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1433 // Resets the claim values of regions in the current |
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1434 // collection set to the default. |
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1435 void reset_cset_heap_region_claim_values(); |
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1436 |
355 | 1437 #ifdef ASSERT |
1438 bool check_heap_region_claim_values(jint claim_value); | |
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1439 |
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1440 // Same as the routine above but only checks regions in the |
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1441 // current collection set. |
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1442 bool check_cset_heap_region_claim_values(jint claim_value); |
355 | 1443 #endif // ASSERT |
1444 | |
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1445 // Clear the cached cset start regions and (more importantly) |
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1446 // the time stamps. Called when we reset the GC time stamp. |
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1447 void clear_cset_start_regions(); |
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1448 |
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1449 // Given the id of a worker, obtain or calculate a suitable |
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1450 // starting region for iterating over the current collection set. |
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1451 HeapRegion* start_cset_region_for_worker(uint worker_i); |
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1452 |
342 | 1453 // Iterate over the regions (if any) in the current collection set. |
1454 void collection_set_iterate(HeapRegionClosure* blk); | |
1455 | |
1456 // As above but starting from region r | |
1457 void collection_set_iterate_from(HeapRegion* r, HeapRegionClosure *blk); | |
1458 | |
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1459 HeapRegion* next_compaction_region(const HeapRegion* from) const; |
342 | 1460 |
1461 // A CollectedHeap will contain some number of spaces. This finds the | |
1462 // space containing a given address, or else returns NULL. | |
1463 virtual Space* space_containing(const void* addr) const; | |
1464 | |
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1465 // Returns the HeapRegion that contains addr. addr must not be NULL. |
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1466 template <class T> |
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1467 inline HeapRegion* heap_region_containing_raw(const T addr) const; |
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1468 |
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1469 // Returns the HeapRegion that contains addr. addr must not be NULL. |
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1470 // If addr is within a humongous continues region, it returns its humongous start region. |
3766 | 1471 template <class T> |
1472 inline HeapRegion* heap_region_containing(const T addr) const; | |
342 | 1473 |
1474 // A CollectedHeap is divided into a dense sequence of "blocks"; that is, | |
1475 // each address in the (reserved) heap is a member of exactly | |
1476 // one block. The defining characteristic of a block is that it is | |
1477 // possible to find its size, and thus to progress forward to the next | |
1478 // block. (Blocks may be of different sizes.) Thus, blocks may | |
1479 // represent Java objects, or they might be free blocks in a | |
1480 // free-list-based heap (or subheap), as long as the two kinds are | |
1481 // distinguishable and the size of each is determinable. | |
1482 | |
1483 // Returns the address of the start of the "block" that contains the | |
1484 // address "addr". We say "blocks" instead of "object" since some heaps | |
1485 // may not pack objects densely; a chunk may either be an object or a | |
1486 // non-object. | |
1487 virtual HeapWord* block_start(const void* addr) const; | |
1488 | |
1489 // Requires "addr" to be the start of a chunk, and returns its size. | |
1490 // "addr + size" is required to be the start of a new chunk, or the end | |
1491 // of the active area of the heap. | |
1492 virtual size_t block_size(const HeapWord* addr) const; | |
1493 | |
1494 // Requires "addr" to be the start of a block, and returns "TRUE" iff | |
1495 // the block is an object. | |
1496 virtual bool block_is_obj(const HeapWord* addr) const; | |
1497 | |
1498 // Does this heap support heap inspection? (+PrintClassHistogram) | |
1499 virtual bool supports_heap_inspection() const { return true; } | |
1500 | |
1501 // Section on thread-local allocation buffers (TLABs) | |
1502 // See CollectedHeap for semantics. | |
1503 | |
17727 | 1504 bool supports_tlab_allocation() const; |
1505 size_t tlab_capacity(Thread* ignored) const; | |
1506 size_t tlab_used(Thread* ignored) const; | |
1507 size_t max_tlab_size() const; | |
1508 size_t unsafe_max_tlab_alloc(Thread* ignored) const; | |
342 | 1509 |
1510 // Can a compiler initialize a new object without store barriers? | |
1511 // This permission only extends from the creation of a new object | |
1027
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1512 // via a TLAB up to the first subsequent safepoint. If such permission |
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1513 // is granted for this heap type, the compiler promises to call |
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1514 // defer_store_barrier() below on any slow path allocation of |
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1515 // a new object for which such initializing store barriers will |
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1516 // have been elided. G1, like CMS, allows this, but should be |
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1517 // ready to provide a compensating write barrier as necessary |
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1518 // if that storage came out of a non-young region. The efficiency |
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1519 // of this implementation depends crucially on being able to |
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1520 // answer very efficiently in constant time whether a piece of |
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1521 // storage in the heap comes from a young region or not. |
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1522 // See ReduceInitialCardMarks. |
342 | 1523 virtual bool can_elide_tlab_store_barriers() const { |
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1524 return true; |
1027
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1525 } |
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1526 |
1166 | 1527 virtual bool card_mark_must_follow_store() const { |
1528 return true; | |
1529 } | |
1530 | |
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1531 inline bool is_in_young(const oop obj); |
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1532 |
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1533 #ifdef ASSERT |
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1534 virtual bool is_in_partial_collection(const void* p); |
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1535 #endif |
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1536 |
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1537 virtual bool is_scavengable(const void* addr); |
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1538 |
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1539 // We don't need barriers for initializing stores to objects |
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1540 // in the young gen: for the SATB pre-barrier, there is no |
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1541 // pre-value that needs to be remembered; for the remembered-set |
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1542 // update logging post-barrier, we don't maintain remembered set |
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1543 // information for young gen objects. |
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1544 virtual inline bool can_elide_initializing_store_barrier(oop new_obj); |
342 | 1545 |
1546 // Returns "true" iff the given word_size is "very large". | |
1547 static bool isHumongous(size_t word_size) { | |
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1548 // Note this has to be strictly greater-than as the TLABs |
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1549 // are capped at the humongous thresold and we want to |
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1550 // ensure that we don't try to allocate a TLAB as |
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1551 // humongous and that we don't allocate a humongous |
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1552 // object in a TLAB. |
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1553 return word_size > _humongous_object_threshold_in_words; |
342 | 1554 } |
1555 | |
1556 // Update mod union table with the set of dirty cards. | |
1557 void updateModUnion(); | |
1558 | |
1559 // Set the mod union bits corresponding to the given memRegion. Note | |
1560 // that this is always a safe operation, since it doesn't clear any | |
1561 // bits. | |
1562 void markModUnionRange(MemRegion mr); | |
1563 | |
1564 // Records the fact that a marking phase is no longer in progress. | |
1565 void set_marking_complete() { | |
1566 _mark_in_progress = false; | |
1567 } | |
1568 void set_marking_started() { | |
1569 _mark_in_progress = true; | |
1570 } | |
1571 bool mark_in_progress() { | |
1572 return _mark_in_progress; | |
1573 } | |
1574 | |
1575 // Print the maximum heap capacity. | |
1576 virtual size_t max_capacity() const; | |
1577 | |
1578 virtual jlong millis_since_last_gc(); | |
1579 | |
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1580 |
342 | 1581 // Convenience function to be used in situations where the heap type can be |
1582 // asserted to be this type. | |
1583 static G1CollectedHeap* heap(); | |
1584 | |
1585 void set_region_short_lived_locked(HeapRegion* hr); | |
1586 // add appropriate methods for any other surv rate groups | |
1587 | |
17727 | 1588 YoungList* young_list() const { return _young_list; } |
342 | 1589 |
1590 // debugging | |
1591 bool check_young_list_well_formed() { | |
1592 return _young_list->check_list_well_formed(); | |
1593 } | |
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1594 |
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1595 bool check_young_list_empty(bool check_heap, |
342 | 1596 bool check_sample = true); |
1597 | |
1598 // *** Stuff related to concurrent marking. It's not clear to me that so | |
1599 // many of these need to be public. | |
1600 | |
1601 // The functions below are helper functions that a subclass of | |
1602 // "CollectedHeap" can use in the implementation of its virtual | |
1603 // functions. | |
1604 // This performs a concurrent marking of the live objects in a | |
1605 // bitmap off to the side. | |
1606 void doConcurrentMark(); | |
1607 | |
1608 bool isMarkedPrev(oop obj) const; | |
1609 bool isMarkedNext(oop obj) const; | |
1610 | |
1611 // Determine if an object is dead, given the object and also | |
1612 // the region to which the object belongs. An object is dead | |
1613 // iff a) it was not allocated since the last mark and b) it | |
1614 // is not marked. | |
1615 bool is_obj_dead(const oop obj, const HeapRegion* hr) const { | |
1616 return | |
1617 !hr->obj_allocated_since_prev_marking(obj) && | |
1618 !isMarkedPrev(obj); | |
1619 } | |
1620 | |
1621 // This function returns true when an object has been | |
1622 // around since the previous marking and hasn't yet | |
1623 // been marked during this marking. | |
1624 bool is_obj_ill(const oop obj, const HeapRegion* hr) const { | |
1625 return | |
1626 !hr->obj_allocated_since_next_marking(obj) && | |
1627 !isMarkedNext(obj); | |
1628 } | |
1629 | |
1630 // Determine if an object is dead, given only the object itself. | |
1631 // This will find the region to which the object belongs and | |
1632 // then call the region version of the same function. | |
1633 | |
1634 // Added if it is NULL it isn't dead. | |
1635 | |
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1636 inline bool is_obj_dead(const oop obj) const; |
342 | 1637 |
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1638 inline bool is_obj_ill(const oop obj) const; |
342 | 1639 |
12080 | 1640 bool allocated_since_marking(oop obj, HeapRegion* hr, VerifyOption vo); |
1641 HeapWord* top_at_mark_start(HeapRegion* hr, VerifyOption vo); | |
1642 bool is_marked(oop obj, VerifyOption vo); | |
1643 const char* top_at_mark_start_str(VerifyOption vo); | |
1644 | |
1645 ConcurrentMark* concurrent_mark() const { return _cm; } | |
1646 | |
1647 // Refinement | |
1648 | |
1649 ConcurrentG1Refine* concurrent_g1_refine() const { return _cg1r; } | |
1650 | |
1651 // The dirty cards region list is used to record a subset of regions | |
1652 // whose cards need clearing. The list if populated during the | |
1653 // remembered set scanning and drained during the card table | |
1654 // cleanup. Although the methods are reentrant, population/draining | |
1655 // phases must not overlap. For synchronization purposes the last | |
1656 // element on the list points to itself. | |
1657 HeapRegion* _dirty_cards_region_list; | |
1658 void push_dirty_cards_region(HeapRegion* hr); | |
1659 HeapRegion* pop_dirty_cards_region(); | |
1660 | |
1661 // Optimized nmethod scanning support routines | |
1662 | |
1663 // Register the given nmethod with the G1 heap | |
1664 virtual void register_nmethod(nmethod* nm); | |
1665 | |
1666 // Unregister the given nmethod from the G1 heap | |
1667 virtual void unregister_nmethod(nmethod* nm); | |
1668 | |
1669 // Migrate the nmethods in the code root lists of the regions | |
1670 // in the collection set to regions in to-space. In the event | |
1671 // of an evacuation failure, nmethods that reference objects | |
1672 // that were not successfullly evacuated are not migrated. | |
1673 void migrate_strong_code_roots(); | |
1674 | |
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1675 // Free up superfluous code root memory. |
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1676 void purge_code_root_memory(); |
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|
1677 |
12080 | 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 |
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1686 // Parallel phase of unloading/cleaning after G1 concurrent mark. |
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1687 void parallel_cleaning(BoolObjectClosure* is_alive, bool process_strings, bool process_symbols, bool class_unloading_occurred); |
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1688 |
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1689 // Redirty logged cards in the refinement queue. |
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1690 void redirty_logged_cards(); |
12080 | 1691 // Verification |
1692 | |
1693 // The following is just to alert the verification code | |
1694 // that a full collection has occurred and that the | |
1695 // remembered sets are no longer up to date. | |
1696 bool _full_collection; | |
1697 void set_full_collection() { _full_collection = true;} | |
1698 void clear_full_collection() {_full_collection = false;} | |
1699 bool full_collection() {return _full_collection;} | |
1700 | |
1701 // Perform any cleanup actions necessary before allowing a verification. | |
1702 virtual void prepare_for_verify(); | |
1703 | |
1704 // Perform verification. | |
1705 | |
1706 // vo == UsePrevMarking -> use "prev" marking information, | |
1707 // vo == UseNextMarking -> use "next" marking information | |
1708 // vo == UseMarkWord -> use the mark word in the object header | |
1709 // | |
1710 // NOTE: Only the "prev" marking information is guaranteed to be | |
1711 // consistent most of the time, so most calls to this should use | |
1712 // vo == UsePrevMarking. | |
1713 // Currently, there is only one case where this is called with | |
1714 // vo == UseNextMarking, which is to verify the "next" marking | |
1715 // information at the end of remark. | |
1716 // Currently there is only one place where this is called with | |
1717 // vo == UseMarkWord, which is to verify the marking during a | |
1718 // full GC. | |
1719 void verify(bool silent, VerifyOption vo); | |
1720 | |
1721 // Override; it uses the "prev" marking information | |
1722 virtual void verify(bool silent); | |
1723 | |
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1724 // The methods below are here for convenience and dispatch the |
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1725 // appropriate method depending on value of the given VerifyOption |
12080 | 1726 // parameter. The values for that parameter, and their meanings, |
1727 // are the same as those above. | |
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1728 |
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1729 bool is_obj_dead_cond(const oop obj, |
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1730 const HeapRegion* hr, |
17833
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1731 const VerifyOption vo) const; |
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1732 |
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1733 bool is_obj_dead_cond(const oop obj, |
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1734 const VerifyOption vo) const; |
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1735 |
12080 | 1736 // Printing |
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1737 |
12080 | 1738 virtual void print_on(outputStream* st) const; |
1739 virtual void print_extended_on(outputStream* st) const; | |
1740 virtual void print_on_error(outputStream* st) const; | |
342 | 1741 |
12080 | 1742 virtual void print_gc_threads_on(outputStream* st) const; |
1743 virtual void gc_threads_do(ThreadClosure* tc) const; | |
342 | 1744 |
12080 | 1745 // Override |
1746 void print_tracing_info() const; | |
1747 | |
1748 // The following two methods are helpful for debugging RSet issues. | |
1749 void print_cset_rsets() PRODUCT_RETURN; | |
1750 void print_all_rsets() PRODUCT_RETURN; | |
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1751 |
342 | 1752 public: |
1753 size_t pending_card_num(); | |
1754 size_t cards_scanned(); | |
1755 | |
1756 protected: | |
1757 size_t _max_heap_capacity; | |
1758 }; | |
1759 | |
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1760 class G1ParGCAllocBuffer: public ParGCAllocBuffer { |
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1761 private: |
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1762 bool _retired; |
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1763 |
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1764 public: |
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1765 G1ParGCAllocBuffer(size_t gclab_word_size); |
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1766 virtual ~G1ParGCAllocBuffer() { |
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1767 guarantee(_retired, "Allocation buffer has not been retired"); |
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1768 } |
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1769 |
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1770 virtual void set_buf(HeapWord* buf) { |
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1771 ParGCAllocBuffer::set_buf(buf); |
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1772 _retired = false; |
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1773 } |
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1774 |
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1775 virtual void retire(bool end_of_gc, bool retain) { |
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1776 if (_retired) { |
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1777 return; |
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1778 } |
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1779 ParGCAllocBuffer::retire(end_of_gc, retain); |
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1780 _retired = true; |
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1781 } |
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1782 }; |
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1783 |
1972 | 1784 #endif // SHARE_VM_GC_IMPLEMENTATION_G1_G1COLLECTEDHEAP_HPP |