Mercurial > hg > truffle
annotate src/share/vm/gc_implementation/g1/g1CollectedHeap.hpp @ 10972:a0a47b2649a2
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author | ctornqvi |
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date | Fri, 14 Jun 2013 13:11:58 +0200 |
parents | f2110083203d |
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rev | line source |
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342 | 1 /* |
10405 | 2 * Copyright (c) 2001, 2013, Oracle and/or its affiliates. All rights reserved. |
342 | 3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
4 * | |
5 * This code is free software; you can redistribute it and/or modify it | |
6 * under the terms of the GNU General Public License version 2 only, as | |
7 * published by the Free Software Foundation. | |
8 * | |
9 * This code is distributed in the hope that it will be useful, but WITHOUT | |
10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or | |
11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License | |
12 * version 2 for more details (a copy is included in the LICENSE file that | |
13 * accompanied this code). | |
14 * | |
15 * You should have received a copy of the GNU General Public License version | |
16 * 2 along with this work; if not, write to the Free Software Foundation, | |
17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. | |
18 * | |
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19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
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20 * or visit www.oracle.com if you need additional information or have any |
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21 * questions. |
342 | 22 * |
23 */ | |
24 | |
1972 | 25 #ifndef SHARE_VM_GC_IMPLEMENTATION_G1_G1COLLECTEDHEAP_HPP |
26 #define SHARE_VM_GC_IMPLEMENTATION_G1_G1COLLECTEDHEAP_HPP | |
27 | |
28 #include "gc_implementation/g1/concurrentMark.hpp" | |
10405 | 29 #include "gc_implementation/g1/evacuationInfo.hpp" |
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30 #include "gc_implementation/g1/g1AllocRegion.hpp" |
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31 #include "gc_implementation/g1/g1HRPrinter.hpp" |
10405 | 32 #include "gc_implementation/g1/g1MonitoringSupport.hpp" |
1972 | 33 #include "gc_implementation/g1/g1RemSet.hpp" |
10405 | 34 #include "gc_implementation/g1/g1YCTypes.hpp" |
3766 | 35 #include "gc_implementation/g1/heapRegionSeq.hpp" |
2152 | 36 #include "gc_implementation/g1/heapRegionSets.hpp" |
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37 #include "gc_implementation/shared/hSpaceCounters.hpp" |
6595 | 38 #include "gc_implementation/shared/parGCAllocBuffer.hpp" |
1972 | 39 #include "memory/barrierSet.hpp" |
40 #include "memory/memRegion.hpp" | |
41 #include "memory/sharedHeap.hpp" | |
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42 #include "utilities/stack.hpp" |
1972 | 43 |
342 | 44 // A "G1CollectedHeap" is an implementation of a java heap for HotSpot. |
45 // It uses the "Garbage First" heap organization and algorithm, which | |
46 // may combine concurrent marking with parallel, incremental compaction of | |
47 // heap subsets that will yield large amounts of garbage. | |
48 | |
49 class HeapRegion; | |
2173 | 50 class HRRSCleanupTask; |
342 | 51 class GenerationSpec; |
52 class OopsInHeapRegionClosure; | |
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53 class G1KlassScanClosure; |
342 | 54 class G1ScanHeapEvacClosure; |
55 class ObjectClosure; | |
56 class SpaceClosure; | |
57 class CompactibleSpaceClosure; | |
58 class Space; | |
59 class G1CollectorPolicy; | |
60 class GenRemSet; | |
61 class G1RemSet; | |
62 class HeapRegionRemSetIterator; | |
63 class ConcurrentMark; | |
64 class ConcurrentMarkThread; | |
65 class ConcurrentG1Refine; | |
10405 | 66 class ConcurrentGCTimer; |
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67 class GenerationCounters; |
10405 | 68 class STWGCTimer; |
69 class G1NewTracer; | |
70 class G1OldTracer; | |
71 class EvacuationFailedInfo; | |
342 | 72 |
6197 | 73 typedef OverflowTaskQueue<StarTask, mtGC> RefToScanQueue; |
74 typedef GenericTaskQueueSet<RefToScanQueue, mtGC> RefToScanQueueSet; | |
342 | 75 |
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76 typedef int RegionIdx_t; // needs to hold [ 0..max_regions() ) |
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77 typedef int CardIdx_t; // needs to hold [ 0..CardsPerRegion ) |
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78 |
342 | 79 enum GCAllocPurpose { |
80 GCAllocForTenured, | |
81 GCAllocForSurvived, | |
82 GCAllocPurposeCount | |
83 }; | |
84 | |
6197 | 85 class YoungList : public CHeapObj<mtGC> { |
342 | 86 private: |
87 G1CollectedHeap* _g1h; | |
88 | |
89 HeapRegion* _head; | |
90 | |
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91 HeapRegion* _survivor_head; |
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92 HeapRegion* _survivor_tail; |
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93 |
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94 HeapRegion* _curr; |
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95 |
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96 uint _length; |
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97 uint _survivor_length; |
342 | 98 |
99 size_t _last_sampled_rs_lengths; | |
100 size_t _sampled_rs_lengths; | |
101 | |
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102 void empty_list(HeapRegion* list); |
342 | 103 |
104 public: | |
105 YoungList(G1CollectedHeap* g1h); | |
106 | |
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107 void push_region(HeapRegion* hr); |
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108 void add_survivor_region(HeapRegion* hr); |
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109 |
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110 void empty_list(); |
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111 bool is_empty() { return _length == 0; } |
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112 uint length() { return _length; } |
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113 uint survivor_length() { return _survivor_length; } |
342 | 114 |
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115 // Currently we do not keep track of the used byte sum for the |
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116 // young list and the survivors and it'd be quite a lot of work to |
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117 // do so. When we'll eventually replace the young list with |
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118 // instances of HeapRegionLinkedList we'll get that for free. So, |
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119 // we'll report the more accurate information then. |
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120 size_t eden_used_bytes() { |
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121 assert(length() >= survivor_length(), "invariant"); |
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122 return (size_t) (length() - survivor_length()) * HeapRegion::GrainBytes; |
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123 } |
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124 size_t survivor_used_bytes() { |
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125 return (size_t) survivor_length() * HeapRegion::GrainBytes; |
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126 } |
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127 |
342 | 128 void rs_length_sampling_init(); |
129 bool rs_length_sampling_more(); | |
130 void rs_length_sampling_next(); | |
131 | |
132 void reset_sampled_info() { | |
133 _last_sampled_rs_lengths = 0; | |
134 } | |
135 size_t sampled_rs_lengths() { return _last_sampled_rs_lengths; } | |
136 | |
137 // for development purposes | |
138 void reset_auxilary_lists(); | |
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139 void clear() { _head = NULL; _length = 0; } |
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140 |
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141 void clear_survivors() { |
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142 _survivor_head = NULL; |
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143 _survivor_tail = NULL; |
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144 _survivor_length = 0; |
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145 } |
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146 |
342 | 147 HeapRegion* first_region() { return _head; } |
148 HeapRegion* first_survivor_region() { return _survivor_head; } | |
545 | 149 HeapRegion* last_survivor_region() { return _survivor_tail; } |
342 | 150 |
151 // debugging | |
152 bool check_list_well_formed(); | |
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153 bool check_list_empty(bool check_sample = true); |
342 | 154 void print(); |
155 }; | |
156 | |
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157 class MutatorAllocRegion : public G1AllocRegion { |
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158 protected: |
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159 virtual HeapRegion* allocate_new_region(size_t word_size, bool force); |
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160 virtual void retire_region(HeapRegion* alloc_region, size_t allocated_bytes); |
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161 public: |
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162 MutatorAllocRegion() |
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163 : G1AllocRegion("Mutator Alloc Region", false /* bot_updates */) { } |
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164 }; |
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165 |
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166 // The G1 STW is alive closure. |
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167 // An instance is embedded into the G1CH and used as the |
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168 // (optional) _is_alive_non_header closure in the STW |
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169 // reference processor. It is also extensively used during |
10405 | 170 // reference processing during STW evacuation pauses. |
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171 class G1STWIsAliveClosure: public BoolObjectClosure { |
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172 G1CollectedHeap* _g1; |
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173 public: |
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174 G1STWIsAliveClosure(G1CollectedHeap* g1) : _g1(g1) {} |
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175 bool do_object_b(oop p); |
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176 }; |
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177 |
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178 class SurvivorGCAllocRegion : public G1AllocRegion { |
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179 protected: |
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180 virtual HeapRegion* allocate_new_region(size_t word_size, bool force); |
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181 virtual void retire_region(HeapRegion* alloc_region, size_t allocated_bytes); |
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182 public: |
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183 SurvivorGCAllocRegion() |
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184 : G1AllocRegion("Survivor GC Alloc Region", false /* bot_updates */) { } |
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185 }; |
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186 |
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187 class OldGCAllocRegion : public G1AllocRegion { |
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188 protected: |
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189 virtual HeapRegion* allocate_new_region(size_t word_size, bool force); |
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190 virtual void retire_region(HeapRegion* alloc_region, size_t allocated_bytes); |
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191 public: |
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192 OldGCAllocRegion() |
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193 : G1AllocRegion("Old GC Alloc Region", true /* bot_updates */) { } |
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194 }; |
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195 |
342 | 196 class RefineCardTableEntryClosure; |
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197 |
342 | 198 class G1CollectedHeap : public SharedHeap { |
199 friend class VM_G1CollectForAllocation; | |
200 friend class VM_G1CollectFull; | |
201 friend class VM_G1IncCollectionPause; | |
202 friend class VMStructs; | |
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203 friend class MutatorAllocRegion; |
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204 friend class SurvivorGCAllocRegion; |
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205 friend class OldGCAllocRegion; |
342 | 206 |
207 // Closures used in implementation. | |
5987 | 208 template <bool do_gen_barrier, G1Barrier barrier, bool do_mark_object> |
209 friend class G1ParCopyClosure; | |
342 | 210 friend class G1IsAliveClosure; |
211 friend class G1EvacuateFollowersClosure; | |
212 friend class G1ParScanThreadState; | |
213 friend class G1ParScanClosureSuper; | |
214 friend class G1ParEvacuateFollowersClosure; | |
215 friend class G1ParTask; | |
216 friend class G1FreeGarbageRegionClosure; | |
217 friend class RefineCardTableEntryClosure; | |
218 friend class G1PrepareCompactClosure; | |
219 friend class RegionSorter; | |
2152 | 220 friend class RegionResetter; |
342 | 221 friend class CountRCClosure; |
222 friend class EvacPopObjClosure; | |
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223 friend class G1ParCleanupCTTask; |
342 | 224 |
225 // Other related classes. | |
226 friend class G1MarkSweep; | |
227 | |
228 private: | |
229 // The one and only G1CollectedHeap, so static functions can find it. | |
230 static G1CollectedHeap* _g1h; | |
231 | |
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232 static size_t _humongous_object_threshold_in_words; |
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233 |
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234 // Storage for the G1 heap. |
342 | 235 VirtualSpace _g1_storage; |
236 MemRegion _g1_reserved; | |
237 | |
238 // The part of _g1_storage that is currently committed. | |
239 MemRegion _g1_committed; | |
240 | |
2152 | 241 // The master free list. It will satisfy all new region allocations. |
242 MasterFreeRegionList _free_list; | |
243 | |
244 // The secondary free list which contains regions that have been | |
245 // freed up during the cleanup process. This will be appended to the | |
246 // master free list when appropriate. | |
247 SecondaryFreeRegionList _secondary_free_list; | |
248 | |
4072 | 249 // It keeps track of the old regions. |
250 MasterOldRegionSet _old_set; | |
251 | |
2152 | 252 // It keeps track of the humongous regions. |
253 MasterHumongousRegionSet _humongous_set; | |
342 | 254 |
255 // The number of regions we could create by expansion. | |
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256 uint _expansion_regions; |
342 | 257 |
258 // The block offset table for the G1 heap. | |
259 G1BlockOffsetSharedArray* _bot_shared; | |
260 | |
4072 | 261 // Tears down the region sets / lists so that they are empty and the |
262 // regions on the heap do not belong to a region set / list. The | |
263 // only exception is the humongous set which we leave unaltered. If | |
264 // free_list_only is true, it will only tear down the master free | |
265 // list. It is called before a Full GC (free_list_only == false) or | |
266 // before heap shrinking (free_list_only == true). | |
267 void tear_down_region_sets(bool free_list_only); | |
268 | |
269 // Rebuilds the region sets / lists so that they are repopulated to | |
270 // reflect the contents of the heap. The only exception is the | |
271 // humongous set which was not torn down in the first place. If | |
272 // free_list_only is true, it will only rebuild the master free | |
273 // list. It is called after a Full GC (free_list_only == false) or | |
274 // after heap shrinking (free_list_only == true). | |
275 void rebuild_region_sets(bool free_list_only); | |
342 | 276 |
277 // The sequence of all heap regions in the heap. | |
3766 | 278 HeapRegionSeq _hrs; |
342 | 279 |
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280 // Alloc region used to satisfy mutator allocation requests. |
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281 MutatorAllocRegion _mutator_alloc_region; |
342 | 282 |
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283 // Alloc region used to satisfy allocation requests by the GC for |
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284 // survivor objects. |
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285 SurvivorGCAllocRegion _survivor_gc_alloc_region; |
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286 |
6595 | 287 // PLAB sizing policy for survivors. |
288 PLABStats _survivor_plab_stats; | |
289 | |
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290 // Alloc region used to satisfy allocation requests by the GC for |
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291 // old objects. |
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292 OldGCAllocRegion _old_gc_alloc_region; |
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293 |
6595 | 294 // PLAB sizing policy for tenured objects. |
295 PLABStats _old_plab_stats; | |
296 | |
297 PLABStats* stats_for_purpose(GCAllocPurpose purpose) { | |
298 PLABStats* stats = NULL; | |
299 | |
300 switch (purpose) { | |
301 case GCAllocForSurvived: | |
302 stats = &_survivor_plab_stats; | |
303 break; | |
304 case GCAllocForTenured: | |
305 stats = &_old_plab_stats; | |
306 break; | |
307 default: | |
308 assert(false, "unrecognized GCAllocPurpose"); | |
309 } | |
310 | |
311 return stats; | |
312 } | |
313 | |
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314 // The last old region we allocated to during the last GC. |
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315 // Typically, it is not full so we should re-use it during the next GC. |
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316 HeapRegion* _retained_old_gc_alloc_region; |
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317 |
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318 // It specifies whether we should attempt to expand the heap after a |
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319 // region allocation failure. If heap expansion fails we set this to |
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320 // false so that we don't re-attempt the heap expansion (it's likely |
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321 // that subsequent expansion attempts will also fail if one fails). |
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322 // Currently, it is only consulted during GC and it's reset at the |
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323 // start of each GC. |
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324 bool _expand_heap_after_alloc_failure; |
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325 |
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326 // It resets the mutator alloc region before new allocations can take place. |
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327 void init_mutator_alloc_region(); |
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328 |
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329 // It releases the mutator alloc region. |
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330 void release_mutator_alloc_region(); |
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331 |
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332 // It initializes the GC alloc regions at the start of a GC. |
10405 | 333 void init_gc_alloc_regions(EvacuationInfo& evacuation_info); |
342 | 334 |
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335 // It releases the GC alloc regions at the end of a GC. |
10405 | 336 void release_gc_alloc_regions(uint no_of_gc_workers, EvacuationInfo& evacuation_info); |
342 | 337 |
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338 // It does any cleanup that needs to be done on the GC alloc regions |
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339 // before a Full GC. |
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340 void abandon_gc_alloc_regions(); |
342 | 341 |
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342 // Helper for monitoring and management support. |
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343 G1MonitoringSupport* _g1mm; |
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344 |
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345 // Determines PLAB size for a particular allocation purpose. |
6595 | 346 size_t desired_plab_sz(GCAllocPurpose purpose); |
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347 |
342 | 348 // Outside of GC pauses, the number of bytes used in all regions other |
349 // than the current allocation region. | |
350 size_t _summary_bytes_used; | |
351 | |
526 | 352 // This is used for a quick test on whether a reference points into |
353 // the collection set or not. Basically, we have an array, with one | |
354 // byte per region, and that byte denotes whether the corresponding | |
355 // region is in the collection set or not. The entry corresponding | |
356 // the bottom of the heap, i.e., region 0, is pointed to by | |
357 // _in_cset_fast_test_base. The _in_cset_fast_test field has been | |
358 // biased so that it actually points to address 0 of the address | |
359 // space, to make the test as fast as possible (we can simply shift | |
360 // the address to address into it, instead of having to subtract the | |
361 // bottom of the heap from the address before shifting it; basically | |
362 // it works in the same way the card table works). | |
363 bool* _in_cset_fast_test; | |
364 | |
365 // The allocated array used for the fast test on whether a reference | |
366 // points into the collection set or not. This field is also used to | |
367 // free the array. | |
368 bool* _in_cset_fast_test_base; | |
369 | |
370 // The length of the _in_cset_fast_test_base array. | |
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371 uint _in_cset_fast_test_length; |
526 | 372 |
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373 volatile unsigned _gc_time_stamp; |
342 | 374 |
375 size_t* _surviving_young_words; | |
376 | |
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377 G1HRPrinter _hr_printer; |
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378 |
342 | 379 void setup_surviving_young_words(); |
380 void update_surviving_young_words(size_t* surv_young_words); | |
381 void cleanup_surviving_young_words(); | |
382 | |
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383 // It decides whether an explicit GC should start a concurrent cycle |
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384 // instead of doing a STW GC. Currently, a concurrent cycle is |
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385 // explicitly started if: |
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386 // (a) cause == _gc_locker and +GCLockerInvokesConcurrent, or |
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387 // (b) cause == _java_lang_system_gc and +ExplicitGCInvokesConcurrent. |
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388 // (c) cause == _g1_humongous_allocation |
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389 bool should_do_concurrent_full_gc(GCCause::Cause cause); |
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390 |
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391 // Keeps track of how many "old marking cycles" (i.e., Full GCs or |
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392 // concurrent cycles) we have started. |
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393 volatile unsigned int _old_marking_cycles_started; |
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394 |
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395 // Keeps track of how many "old marking cycles" (i.e., Full GCs or |
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396 // concurrent cycles) we have completed. |
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397 volatile unsigned int _old_marking_cycles_completed; |
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398 |
10405 | 399 bool _concurrent_cycle_started; |
400 | |
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401 // This is a non-product method that is helpful for testing. It is |
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402 // called at the end of a GC and artificially expands the heap by |
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403 // allocating a number of dead regions. This way we can induce very |
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404 // frequent marking cycles and stress the cleanup / concurrent |
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405 // cleanup code more (as all the regions that will be allocated by |
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406 // this method will be found dead by the marking cycle). |
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407 void allocate_dummy_regions() PRODUCT_RETURN; |
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408 |
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409 // Clear RSets after a compaction. It also resets the GC time stamps. |
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410 void clear_rsets_post_compaction(); |
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411 |
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412 // If the HR printer is active, dump the state of the regions in the |
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413 // heap after a compaction. |
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414 void print_hrs_post_compaction(); |
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415 |
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416 double verify(bool guard, const char* msg); |
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417 void verify_before_gc(); |
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418 void verify_after_gc(); |
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419 |
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420 void log_gc_header(); |
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421 void log_gc_footer(double pause_time_sec); |
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422 |
1973 | 423 // These are macros so that, if the assert fires, we get the correct |
424 // line number, file, etc. | |
425 | |
2361 | 426 #define heap_locking_asserts_err_msg(_extra_message_) \ |
2152 | 427 err_msg("%s : Heap_lock locked: %s, at safepoint: %s, is VM thread: %s", \ |
2361 | 428 (_extra_message_), \ |
2152 | 429 BOOL_TO_STR(Heap_lock->owned_by_self()), \ |
430 BOOL_TO_STR(SafepointSynchronize::is_at_safepoint()), \ | |
431 BOOL_TO_STR(Thread::current()->is_VM_thread())) | |
1973 | 432 |
433 #define assert_heap_locked() \ | |
434 do { \ | |
435 assert(Heap_lock->owned_by_self(), \ | |
436 heap_locking_asserts_err_msg("should be holding the Heap_lock")); \ | |
437 } while (0) | |
438 | |
2361 | 439 #define assert_heap_locked_or_at_safepoint(_should_be_vm_thread_) \ |
1973 | 440 do { \ |
441 assert(Heap_lock->owned_by_self() || \ | |
2152 | 442 (SafepointSynchronize::is_at_safepoint() && \ |
2361 | 443 ((_should_be_vm_thread_) == Thread::current()->is_VM_thread())), \ |
1973 | 444 heap_locking_asserts_err_msg("should be holding the Heap_lock or " \ |
445 "should be at a safepoint")); \ | |
446 } while (0) | |
447 | |
448 #define assert_heap_locked_and_not_at_safepoint() \ | |
449 do { \ | |
450 assert(Heap_lock->owned_by_self() && \ | |
451 !SafepointSynchronize::is_at_safepoint(), \ | |
452 heap_locking_asserts_err_msg("should be holding the Heap_lock and " \ | |
453 "should not be at a safepoint")); \ | |
454 } while (0) | |
455 | |
456 #define assert_heap_not_locked() \ | |
457 do { \ | |
458 assert(!Heap_lock->owned_by_self(), \ | |
459 heap_locking_asserts_err_msg("should not be holding the Heap_lock")); \ | |
460 } while (0) | |
461 | |
462 #define assert_heap_not_locked_and_not_at_safepoint() \ | |
463 do { \ | |
464 assert(!Heap_lock->owned_by_self() && \ | |
465 !SafepointSynchronize::is_at_safepoint(), \ | |
466 heap_locking_asserts_err_msg("should not be holding the Heap_lock and " \ | |
467 "should not be at a safepoint")); \ | |
468 } while (0) | |
469 | |
2361 | 470 #define assert_at_safepoint(_should_be_vm_thread_) \ |
1973 | 471 do { \ |
2152 | 472 assert(SafepointSynchronize::is_at_safepoint() && \ |
2361 | 473 ((_should_be_vm_thread_) == Thread::current()->is_VM_thread()), \ |
1973 | 474 heap_locking_asserts_err_msg("should be at a safepoint")); \ |
475 } while (0) | |
476 | |
477 #define assert_not_at_safepoint() \ | |
478 do { \ | |
479 assert(!SafepointSynchronize::is_at_safepoint(), \ | |
480 heap_locking_asserts_err_msg("should not be at a safepoint")); \ | |
481 } while (0) | |
482 | |
342 | 483 protected: |
484 | |
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485 // The young region list. |
342 | 486 YoungList* _young_list; |
487 | |
488 // The current policy object for the collector. | |
489 G1CollectorPolicy* _g1_policy; | |
490 | |
2152 | 491 // This is the second level of trying to allocate a new region. If |
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492 // new_region() didn't find a region on the free_list, this call will |
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493 // check whether there's anything available on the |
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494 // secondary_free_list and/or wait for more regions to appear on |
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495 // that list, if _free_regions_coming is set. |
2361 | 496 HeapRegion* new_region_try_secondary_free_list(); |
342 | 497 |
2361 | 498 // Try to allocate a single non-humongous HeapRegion sufficient for |
499 // an allocation of the given word_size. If do_expand is true, | |
500 // attempt to expand the heap if necessary to satisfy the allocation | |
501 // request. | |
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502 HeapRegion* new_region(size_t word_size, bool do_expand); |
342 | 503 |
2361 | 504 // Attempt to satisfy a humongous allocation request of the given |
505 // size by finding a contiguous set of free regions of num_regions | |
506 // length and remove them from the master free list. Return the | |
3766 | 507 // index of the first region or G1_NULL_HRS_INDEX if the search |
508 // was unsuccessful. | |
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509 uint humongous_obj_allocate_find_first(uint num_regions, |
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510 size_t word_size); |
342 | 511 |
2361 | 512 // Initialize a contiguous set of free regions of length num_regions |
513 // and starting at index first so that they appear as a single | |
514 // humongous region. | |
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515 HeapWord* humongous_obj_allocate_initialize_regions(uint first, |
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516 uint num_regions, |
2361 | 517 size_t word_size); |
518 | |
519 // Attempt to allocate a humongous object of the given size. Return | |
520 // NULL if unsuccessful. | |
2152 | 521 HeapWord* humongous_obj_allocate(size_t word_size); |
1973 | 522 |
523 // The following two methods, allocate_new_tlab() and | |
524 // mem_allocate(), are the two main entry points from the runtime | |
525 // into the G1's allocation routines. They have the following | |
526 // assumptions: | |
527 // | |
528 // * They should both be called outside safepoints. | |
529 // | |
530 // * They should both be called without holding the Heap_lock. | |
531 // | |
532 // * All allocation requests for new TLABs should go to | |
533 // allocate_new_tlab(). | |
534 // | |
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535 // * All non-TLAB allocation requests should go to mem_allocate(). |
1973 | 536 // |
537 // * If either call cannot satisfy the allocation request using the | |
538 // current allocating region, they will try to get a new one. If | |
539 // this fails, they will attempt to do an evacuation pause and | |
540 // retry the allocation. | |
541 // | |
542 // * If all allocation attempts fail, even after trying to schedule | |
543 // an evacuation pause, allocate_new_tlab() will return NULL, | |
544 // whereas mem_allocate() will attempt a heap expansion and/or | |
545 // schedule a Full GC. | |
546 // | |
547 // * We do not allow humongous-sized TLABs. So, allocate_new_tlab | |
548 // should never be called with word_size being humongous. All | |
549 // humongous allocation requests should go to mem_allocate() which | |
550 // will satisfy them with a special path. | |
551 | |
552 virtual HeapWord* allocate_new_tlab(size_t word_size); | |
553 | |
554 virtual HeapWord* mem_allocate(size_t word_size, | |
555 bool* gc_overhead_limit_was_exceeded); | |
342 | 556 |
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557 // The following three methods take a gc_count_before_ret |
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558 // parameter which is used to return the GC count if the method |
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559 // returns NULL. Given that we are required to read the GC count |
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560 // while holding the Heap_lock, and these paths will take the |
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561 // Heap_lock at some point, it's easier to get them to read the GC |
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562 // count while holding the Heap_lock before they return NULL instead |
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563 // of the caller (namely: mem_allocate()) having to also take the |
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564 // Heap_lock just to read the GC count. |
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565 |
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566 // First-level mutator allocation attempt: try to allocate out of |
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567 // the mutator alloc region without taking the Heap_lock. This |
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568 // should only be used for non-humongous allocations. |
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569 inline HeapWord* attempt_allocation(size_t word_size, |
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570 unsigned int* gc_count_before_ret, |
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571 int* gclocker_retry_count_ret); |
342 | 572 |
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573 // Second-level mutator allocation attempt: take the Heap_lock and |
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574 // retry the allocation attempt, potentially scheduling a GC |
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575 // pause. This should only be used for non-humongous allocations. |
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576 HeapWord* attempt_allocation_slow(size_t word_size, |
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577 unsigned int* gc_count_before_ret, |
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578 int* gclocker_retry_count_ret); |
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579 |
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580 // Takes the Heap_lock and attempts a humongous allocation. It can |
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581 // potentially schedule a GC pause. |
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582 HeapWord* attempt_allocation_humongous(size_t word_size, |
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583 unsigned int* gc_count_before_ret, |
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584 int* gclocker_retry_count_ret); |
1973 | 585 |
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586 // Allocation attempt that should be called during safepoints (e.g., |
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587 // at the end of a successful GC). expect_null_mutator_alloc_region |
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588 // specifies whether the mutator alloc region is expected to be NULL |
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589 // or not. |
1973 | 590 HeapWord* attempt_allocation_at_safepoint(size_t word_size, |
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591 bool expect_null_mutator_alloc_region); |
1973 | 592 |
593 // It dirties the cards that cover the block so that so that the post | |
594 // write barrier never queues anything when updating objects on this | |
595 // block. It is assumed (and in fact we assert) that the block | |
596 // belongs to a young region. | |
597 inline void dirty_young_block(HeapWord* start, size_t word_size); | |
342 | 598 |
599 // Allocate blocks during garbage collection. Will ensure an | |
600 // allocation region, either by picking one or expanding the | |
601 // heap, and then allocate a block of the given size. The block | |
602 // may not be a humongous - it must fit into a single heap region. | |
603 HeapWord* par_allocate_during_gc(GCAllocPurpose purpose, size_t word_size); | |
604 | |
605 // Ensure that no further allocations can happen in "r", bearing in mind | |
606 // that parallel threads might be attempting allocations. | |
607 void par_allocate_remaining_space(HeapRegion* r); | |
608 | |
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609 // Allocation attempt during GC for a survivor object / PLAB. |
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610 inline HeapWord* survivor_attempt_allocation(size_t word_size); |
545 | 611 |
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612 // Allocation attempt during GC for an old object / PLAB. |
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613 inline HeapWord* old_attempt_allocation(size_t word_size); |
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614 |
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615 // These methods are the "callbacks" from the G1AllocRegion class. |
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616 |
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617 // For mutator alloc regions. |
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618 HeapRegion* new_mutator_alloc_region(size_t word_size, bool force); |
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619 void retire_mutator_alloc_region(HeapRegion* alloc_region, |
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620 size_t allocated_bytes); |
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621 |
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622 // For GC alloc regions. |
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623 HeapRegion* new_gc_alloc_region(size_t word_size, uint count, |
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624 GCAllocPurpose ap); |
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625 void retire_gc_alloc_region(HeapRegion* alloc_region, |
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626 size_t allocated_bytes, GCAllocPurpose ap); |
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627 |
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628 // - if explicit_gc is true, the GC is for a System.gc() or a heap |
1973 | 629 // inspection request and should collect the entire heap |
630 // - if clear_all_soft_refs is true, all soft references should be | |
631 // cleared during the GC | |
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632 // - if explicit_gc is false, word_size describes the allocation that |
1973 | 633 // the GC should attempt (at least) to satisfy |
634 // - it returns false if it is unable to do the collection due to the | |
635 // GC locker being active, true otherwise | |
636 bool do_collection(bool explicit_gc, | |
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637 bool clear_all_soft_refs, |
342 | 638 size_t word_size); |
639 | |
640 // Callback from VM_G1CollectFull operation. | |
641 // Perform a full collection. | |
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642 virtual void do_full_collection(bool clear_all_soft_refs); |
342 | 643 |
644 // Resize the heap if necessary after a full collection. If this is | |
645 // after a collect-for allocation, "word_size" is the allocation size, | |
646 // and will be considered part of the used portion of the heap. | |
647 void resize_if_necessary_after_full_collection(size_t word_size); | |
648 | |
649 // Callback from VM_G1CollectForAllocation operation. | |
650 // This function does everything necessary/possible to satisfy a | |
651 // failed allocation request (including collection, expansion, etc.) | |
1973 | 652 HeapWord* satisfy_failed_allocation(size_t word_size, bool* succeeded); |
342 | 653 |
654 // Attempting to expand the heap sufficiently | |
655 // to support an allocation of the given "word_size". If | |
656 // successful, perform the allocation and return the address of the | |
657 // allocated block, or else "NULL". | |
1973 | 658 HeapWord* expand_and_allocate(size_t word_size); |
342 | 659 |
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660 // Process any reference objects discovered during |
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661 // an incremental evacuation pause. |
6819 | 662 void process_discovered_references(uint no_of_gc_workers); |
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663 |
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664 // Enqueue any remaining discovered references |
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665 // after processing. |
6819 | 666 void enqueue_discovered_references(uint no_of_gc_workers); |
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667 |
342 | 668 public: |
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669 |
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670 G1MonitoringSupport* g1mm() { |
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671 assert(_g1mm != NULL, "should have been initialized"); |
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672 return _g1mm; |
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673 } |
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674 |
342 | 675 // Expand the garbage-first heap by at least the given size (in bytes!). |
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676 // Returns true if the heap was expanded by the requested amount; |
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677 // false otherwise. |
342 | 678 // (Rounds up to a HeapRegion boundary.) |
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679 bool expand(size_t expand_bytes); |
342 | 680 |
681 // Do anything common to GC's. | |
682 virtual void gc_prologue(bool full); | |
683 virtual void gc_epilogue(bool full); | |
684 | |
526 | 685 // We register a region with the fast "in collection set" test. We |
686 // simply set to true the array slot corresponding to this region. | |
687 void register_region_with_in_cset_fast_test(HeapRegion* r) { | |
688 assert(_in_cset_fast_test_base != NULL, "sanity"); | |
689 assert(r->in_collection_set(), "invariant"); | |
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690 uint index = r->hrs_index(); |
3766 | 691 assert(index < _in_cset_fast_test_length, "invariant"); |
526 | 692 assert(!_in_cset_fast_test_base[index], "invariant"); |
693 _in_cset_fast_test_base[index] = true; | |
694 } | |
695 | |
696 // This is a fast test on whether a reference points into the | |
697 // collection set or not. It does not assume that the reference | |
698 // points into the heap; if it doesn't, it will return false. | |
699 bool in_cset_fast_test(oop obj) { | |
700 assert(_in_cset_fast_test != NULL, "sanity"); | |
701 if (_g1_committed.contains((HeapWord*) obj)) { | |
702 // no need to subtract the bottom of the heap from obj, | |
703 // _in_cset_fast_test is biased | |
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704 uintx index = (uintx) obj >> HeapRegion::LogOfHRGrainBytes; |
526 | 705 bool ret = _in_cset_fast_test[index]; |
706 // let's make sure the result is consistent with what the slower | |
707 // test returns | |
708 assert( ret || !obj_in_cs(obj), "sanity"); | |
709 assert(!ret || obj_in_cs(obj), "sanity"); | |
710 return ret; | |
711 } else { | |
712 return false; | |
713 } | |
714 } | |
715 | |
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716 void clear_cset_fast_test() { |
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717 assert(_in_cset_fast_test_base != NULL, "sanity"); |
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718 memset(_in_cset_fast_test_base, false, |
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719 (size_t) _in_cset_fast_test_length * sizeof(bool)); |
1394
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720 } |
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721 |
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722 // This is called at the start of either a concurrent cycle or a Full |
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723 // GC to update the number of old marking cycles started. |
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724 void increment_old_marking_cycles_started(); |
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725 |
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726 // This is called at the end of either a concurrent cycle or a Full |
6120
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727 // GC to update the number of old marking cycles completed. Those two |
1656
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728 // can happen in a nested fashion, i.e., we start a concurrent |
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729 // cycle, a Full GC happens half-way through it which ends first, |
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730 // and then the cycle notices that a Full GC happened and ends |
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731 // too. The concurrent parameter is a boolean to help us do a bit |
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732 // tighter consistency checking in the method. If concurrent is |
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733 // false, the caller is the inner caller in the nesting (i.e., the |
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734 // Full GC). If concurrent is true, the caller is the outer caller |
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735 // in this nesting (i.e., the concurrent cycle). Further nesting is |
6120
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736 // not currently supported. The end of this call also notifies |
2030
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737 // the FullGCCount_lock in case a Java thread is waiting for a full |
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738 // GC to happen (e.g., it called System.gc() with |
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739 // +ExplicitGCInvokesConcurrent). |
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740 void increment_old_marking_cycles_completed(bool concurrent); |
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741 |
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742 unsigned int old_marking_cycles_completed() { |
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743 return _old_marking_cycles_completed; |
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744 } |
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745 |
10405 | 746 void register_concurrent_cycle_start(jlong start_time); |
747 void register_concurrent_cycle_end(); | |
748 void trace_heap_after_concurrent_cycle(); | |
749 | |
750 G1YCType yc_type(); | |
751 | |
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752 G1HRPrinter* hr_printer() { return &_hr_printer; } |
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753 |
342 | 754 protected: |
755 | |
756 // Shrink the garbage-first heap by at most the given size (in bytes!). | |
757 // (Rounds down to a HeapRegion boundary.) | |
758 virtual void shrink(size_t expand_bytes); | |
759 void shrink_helper(size_t expand_bytes); | |
760 | |
1709 | 761 #if TASKQUEUE_STATS |
762 static void print_taskqueue_stats_hdr(outputStream* const st = gclog_or_tty); | |
763 void print_taskqueue_stats(outputStream* const st = gclog_or_tty) const; | |
764 void reset_taskqueue_stats(); | |
765 #endif // TASKQUEUE_STATS | |
766 | |
1973 | 767 // Schedule the VM operation that will do an evacuation pause to |
768 // satisfy an allocation request of word_size. *succeeded will | |
769 // return whether the VM operation was successful (it did do an | |
770 // evacuation pause) or not (another thread beat us to it or the GC | |
771 // locker was active). Given that we should not be holding the | |
772 // Heap_lock when we enter this method, we will pass the | |
773 // gc_count_before (i.e., total_collections()) as a parameter since | |
774 // it has to be read while holding the Heap_lock. Currently, both | |
775 // methods that call do_collection_pause() release the Heap_lock | |
776 // before the call, so it's easy to read gc_count_before just before. | |
777 HeapWord* do_collection_pause(size_t word_size, | |
778 unsigned int gc_count_before, | |
779 bool* succeeded); | |
342 | 780 |
781 // The guts of the incremental collection pause, executed by the vm | |
1973 | 782 // thread. It returns false if it is unable to do the collection due |
783 // to the GC locker being active, true otherwise | |
784 bool do_collection_pause_at_safepoint(double target_pause_time_ms); | |
342 | 785 |
786 // Actually do the work of evacuating the collection set. | |
10405 | 787 void evacuate_collection_set(EvacuationInfo& evacuation_info); |
342 | 788 |
789 // The g1 remembered set of the heap. | |
790 G1RemSet* _g1_rem_set; | |
791 // And it's mod ref barrier set, used to track updates for the above. | |
792 ModRefBarrierSet* _mr_bs; | |
793 | |
616
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794 // A set of cards that cover the objects for which the Rsets should be updated |
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795 // concurrently after the collection. |
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796 DirtyCardQueueSet _dirty_card_queue_set; |
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797 |
342 | 798 // The closure used to refine a single card. |
799 RefineCardTableEntryClosure* _refine_cte_cl; | |
800 | |
801 // A function to check the consistency of dirty card logs. | |
802 void check_ct_logs_at_safepoint(); | |
803 | |
1705 | 804 // A DirtyCardQueueSet that is used to hold cards that contain |
805 // references into the current collection set. This is used to | |
806 // update the remembered sets of the regions in the collection | |
807 // set in the event of an evacuation failure. | |
808 DirtyCardQueueSet _into_cset_dirty_card_queue_set; | |
809 | |
342 | 810 // After a collection pause, make the regions in the CS into free |
811 // regions. | |
10405 | 812 void free_collection_set(HeapRegion* cs_head, EvacuationInfo& evacuation_info); |
342 | 813 |
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814 // Abandon the current collection set without recording policy |
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815 // statistics or updating free lists. |
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816 void abandon_collection_set(HeapRegion* cs_head); |
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817 |
342 | 818 // Applies "scan_non_heap_roots" to roots outside the heap, |
819 // "scan_rs" to roots inside the heap (having done "set_region" to | |
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820 // indicate the region in which the root resides), |
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821 // and does "scan_metadata" If "scan_rs" is |
342 | 822 // NULL, then this step is skipped. The "worker_i" |
823 // param is for use with parallel roots processing, and should be | |
824 // the "i" of the calling parallel worker thread's work(i) function. | |
825 // In the sequential case this param will be ignored. | |
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826 void g1_process_strong_roots(bool is_scavenging, |
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827 ScanningOption so, |
342 | 828 OopClosure* scan_non_heap_roots, |
829 OopsInHeapRegionClosure* scan_rs, | |
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830 G1KlassScanClosure* scan_klasses, |
342 | 831 int worker_i); |
832 | |
833 // Apply "blk" to all the weak roots of the system. These include | |
834 // JNI weak roots, the code cache, system dictionary, symbol table, | |
835 // string table, and referents of reachable weak refs. | |
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836 void g1_process_weak_roots(OopClosure* root_closure); |
342 | 837 |
2361 | 838 // Frees a non-humongous region by initializing its contents and |
2152 | 839 // adding it to the free list that's passed as a parameter (this is |
840 // usually a local list which will be appended to the master free | |
841 // list later). The used bytes of freed regions are accumulated in | |
842 // pre_used. If par is true, the region's RSet will not be freed | |
843 // up. The assumption is that this will be done later. | |
844 void free_region(HeapRegion* hr, | |
845 size_t* pre_used, | |
846 FreeRegionList* free_list, | |
847 bool par); | |
342 | 848 |
2361 | 849 // Frees a humongous region by collapsing it into individual regions |
850 // and calling free_region() for each of them. The freed regions | |
851 // will be added to the free list that's passed as a parameter (this | |
852 // is usually a local list which will be appended to the master free | |
853 // list later). The used bytes of freed regions are accumulated in | |
854 // pre_used. If par is true, the region's RSet will not be freed | |
855 // up. The assumption is that this will be done later. | |
2152 | 856 void free_humongous_region(HeapRegion* hr, |
857 size_t* pre_used, | |
858 FreeRegionList* free_list, | |
859 HumongousRegionSet* humongous_proxy_set, | |
860 bool par); | |
342 | 861 |
3766 | 862 // Notifies all the necessary spaces that the committed space has |
863 // been updated (either expanded or shrunk). It should be called | |
864 // after _g1_storage is updated. | |
865 void update_committed_space(HeapWord* old_end, HeapWord* new_end); | |
866 | |
342 | 867 // The concurrent marker (and the thread it runs in.) |
868 ConcurrentMark* _cm; | |
869 ConcurrentMarkThread* _cmThread; | |
870 bool _mark_in_progress; | |
871 | |
872 // The concurrent refiner. | |
873 ConcurrentG1Refine* _cg1r; | |
874 | |
875 // The parallel task queues | |
876 RefToScanQueueSet *_task_queues; | |
877 | |
878 // True iff a evacuation has failed in the current collection. | |
879 bool _evacuation_failed; | |
880 | |
10405 | 881 EvacuationFailedInfo* _evacuation_failed_info_array; |
342 | 882 |
883 // Failed evacuations cause some logical from-space objects to have | |
884 // forwarding pointers to themselves. Reset them. | |
885 void remove_self_forwarding_pointers(); | |
886 | |
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887 // Together, these store an object with a preserved mark, and its mark value. |
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888 Stack<oop, mtGC> _objs_with_preserved_marks; |
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889 Stack<markOop, mtGC> _preserved_marks_of_objs; |
342 | 890 |
891 // Preserve the mark of "obj", if necessary, in preparation for its mark | |
892 // word being overwritten with a self-forwarding-pointer. | |
893 void preserve_mark_if_necessary(oop obj, markOop m); | |
894 | |
895 // The stack of evac-failure objects left to be scanned. | |
896 GrowableArray<oop>* _evac_failure_scan_stack; | |
897 // The closure to apply to evac-failure objects. | |
898 | |
899 OopsInHeapRegionClosure* _evac_failure_closure; | |
900 // Set the field above. | |
901 void | |
902 set_evac_failure_closure(OopsInHeapRegionClosure* evac_failure_closure) { | |
903 _evac_failure_closure = evac_failure_closure; | |
904 } | |
905 | |
906 // Push "obj" on the scan stack. | |
907 void push_on_evac_failure_scan_stack(oop obj); | |
908 // Process scan stack entries until the stack is empty. | |
909 void drain_evac_failure_scan_stack(); | |
910 // True iff an invocation of "drain_scan_stack" is in progress; to | |
911 // prevent unnecessary recursion. | |
912 bool _drain_in_progress; | |
913 | |
914 // Do any necessary initialization for evacuation-failure handling. | |
915 // "cl" is the closure that will be used to process evac-failure | |
916 // objects. | |
917 void init_for_evac_failure(OopsInHeapRegionClosure* cl); | |
918 // Do any necessary cleanup for evacuation-failure handling data | |
919 // structures. | |
920 void finalize_for_evac_failure(); | |
921 | |
922 // An attempt to evacuate "obj" has failed; take necessary steps. | |
10405 | 923 oop handle_evacuation_failure_par(G1ParScanThreadState* _par_scan_state, oop obj); |
342 | 924 void handle_evacuation_failure_common(oop obj, markOop m); |
925 | |
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926 #ifndef PRODUCT |
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927 // Support for forcing evacuation failures. Analogous to |
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928 // PromotionFailureALot for the other collectors. |
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929 |
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930 // Records whether G1EvacuationFailureALot should be in effect |
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931 // for the current GC |
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932 bool _evacuation_failure_alot_for_current_gc; |
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933 |
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934 // Used to record the GC number for interval checking when |
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935 // determining whether G1EvaucationFailureALot is in effect |
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936 // for the current GC. |
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937 size_t _evacuation_failure_alot_gc_number; |
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938 |
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939 // Count of the number of evacuations between failures. |
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940 volatile size_t _evacuation_failure_alot_count; |
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941 |
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942 // Set whether G1EvacuationFailureALot should be in effect |
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943 // for the current GC (based upon the type of GC and which |
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944 // command line flags are set); |
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945 inline bool evacuation_failure_alot_for_gc_type(bool gcs_are_young, |
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946 bool during_initial_mark, |
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947 bool during_marking); |
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948 |
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949 inline void set_evacuation_failure_alot_for_current_gc(); |
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950 |
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951 // Return true if it's time to cause an evacuation failure. |
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952 inline bool evacuation_should_fail(); |
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953 |
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954 // Reset the G1EvacuationFailureALot counters. Should be called at |
10405 | 955 // the end of an evacuation pause in which an evacuation failure occurred. |
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956 inline void reset_evacuation_should_fail(); |
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957 #endif // !PRODUCT |
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958 |
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959 // ("Weak") Reference processing support. |
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960 // |
10405 | 961 // G1 has 2 instances of the reference processor class. One |
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962 // (_ref_processor_cm) handles reference object discovery |
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963 // and subsequent processing during concurrent marking cycles. |
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964 // |
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965 // The other (_ref_processor_stw) handles reference object |
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966 // discovery and processing during full GCs and incremental |
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967 // evacuation pauses. |
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968 // |
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969 // During an incremental pause, reference discovery will be |
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970 // temporarily disabled for _ref_processor_cm and will be |
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971 // enabled for _ref_processor_stw. At the end of the evacuation |
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972 // pause references discovered by _ref_processor_stw will be |
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973 // processed and discovery will be disabled. The previous |
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974 // setting for reference object discovery for _ref_processor_cm |
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975 // will be re-instated. |
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976 // |
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977 // At the start of marking: |
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978 // * Discovery by the CM ref processor is verified to be inactive |
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979 // and it's discovered lists are empty. |
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980 // * Discovery by the CM ref processor is then enabled. |
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981 // |
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982 // At the end of marking: |
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983 // * Any references on the CM ref processor's discovered |
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984 // lists are processed (possibly MT). |
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985 // |
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986 // At the start of full GC we: |
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987 // * Disable discovery by the CM ref processor and |
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988 // empty CM ref processor's discovered lists |
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989 // (without processing any entries). |
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990 // * Verify that the STW ref processor is inactive and it's |
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991 // discovered lists are empty. |
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992 // * Temporarily set STW ref processor discovery as single threaded. |
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993 // * Temporarily clear the STW ref processor's _is_alive_non_header |
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994 // field. |
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995 // * Finally enable discovery by the STW ref processor. |
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996 // |
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997 // The STW ref processor is used to record any discovered |
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998 // references during the full GC. |
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999 // |
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1000 // At the end of a full GC we: |
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1001 // * Enqueue any reference objects discovered by the STW ref processor |
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1002 // that have non-live referents. This has the side-effect of |
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1003 // making the STW ref processor inactive by disabling discovery. |
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1004 // * Verify that the CM ref processor is still inactive |
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1005 // and no references have been placed on it's discovered |
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1006 // lists (also checked as a precondition during initial marking). |
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1007 |
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1008 // The (stw) reference processor... |
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1009 ReferenceProcessor* _ref_processor_stw; |
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1010 |
10405 | 1011 STWGCTimer* _gc_timer_stw; |
1012 ConcurrentGCTimer* _gc_timer_cm; | |
1013 | |
1014 G1OldTracer* _gc_tracer_cm; | |
1015 G1NewTracer* _gc_tracer_stw; | |
1016 | |
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1017 // During reference object discovery, the _is_alive_non_header |
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1018 // closure (if non-null) is applied to the referent object to |
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1019 // determine whether the referent is live. If so then the |
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1020 // reference object does not need to be 'discovered' and can |
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1021 // be treated as a regular oop. This has the benefit of reducing |
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1022 // the number of 'discovered' reference objects that need to |
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1023 // be processed. |
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1024 // |
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1025 // Instance of the is_alive closure for embedding into the |
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1026 // STW reference processor as the _is_alive_non_header field. |
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1027 // Supplying a value for the _is_alive_non_header field is |
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1028 // optional but doing so prevents unnecessary additions to |
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1029 // the discovered lists during reference discovery. |
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1030 G1STWIsAliveClosure _is_alive_closure_stw; |
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1031 |
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1032 // The (concurrent marking) reference processor... |
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1033 ReferenceProcessor* _ref_processor_cm; |
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1034 |
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1035 // Instance of the concurrent mark is_alive closure for embedding |
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1036 // into the Concurrent Marking reference processor as the |
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1037 // _is_alive_non_header field. Supplying a value for the |
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1038 // _is_alive_non_header field is optional but doing so prevents |
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1039 // unnecessary additions to the discovered lists during reference |
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1040 // discovery. |
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1041 G1CMIsAliveClosure _is_alive_closure_cm; |
342 | 1042 |
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1043 // Cache used by G1CollectedHeap::start_cset_region_for_worker(). |
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1044 HeapRegion** _worker_cset_start_region; |
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1045 |
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1046 // Time stamp to validate the regions recorded in the cache |
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1047 // used by G1CollectedHeap::start_cset_region_for_worker(). |
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1048 // The heap region entry for a given worker is valid iff |
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1049 // the associated time stamp value matches the current value |
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1050 // of G1CollectedHeap::_gc_time_stamp. |
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1051 unsigned int* _worker_cset_start_region_time_stamp; |
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1052 |
342 | 1053 enum G1H_process_strong_roots_tasks { |
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1054 G1H_PS_filter_satb_buffers, |
342 | 1055 G1H_PS_refProcessor_oops_do, |
1056 // Leave this one last. | |
1057 G1H_PS_NumElements | |
1058 }; | |
1059 | |
1060 SubTasksDone* _process_strong_tasks; | |
1061 | |
2152 | 1062 volatile bool _free_regions_coming; |
342 | 1063 |
1064 public: | |
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1065 |
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1066 SubTasksDone* process_strong_tasks() { return _process_strong_tasks; } |
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1067 |
342 | 1068 void set_refine_cte_cl_concurrency(bool concurrent); |
1069 | |
1709 | 1070 RefToScanQueue *task_queue(int i) const; |
342 | 1071 |
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1072 // A set of cards where updates happened during the GC |
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1073 DirtyCardQueueSet& dirty_card_queue_set() { return _dirty_card_queue_set; } |
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1074 |
1705 | 1075 // A DirtyCardQueueSet that is used to hold cards that contain |
1076 // references into the current collection set. This is used to | |
1077 // update the remembered sets of the regions in the collection | |
1078 // set in the event of an evacuation failure. | |
1079 DirtyCardQueueSet& into_cset_dirty_card_queue_set() | |
1080 { return _into_cset_dirty_card_queue_set; } | |
1081 | |
342 | 1082 // Create a G1CollectedHeap with the specified policy. |
1083 // Must call the initialize method afterwards. | |
1084 // May not return if something goes wrong. | |
1085 G1CollectedHeap(G1CollectorPolicy* policy); | |
1086 | |
1087 // Initialize the G1CollectedHeap to have the initial and | |
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1088 // maximum sizes and remembered and barrier sets |
342 | 1089 // specified by the policy object. |
1090 jint initialize(); | |
1091 | |
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1092 // Initialize weak reference processing. |
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1093 virtual void ref_processing_init(); |
342 | 1094 |
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1095 void set_par_threads(uint t) { |
342 | 1096 SharedHeap::set_par_threads(t); |
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1097 // Done in SharedHeap but oddly there are |
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1098 // two _process_strong_tasks's in a G1CollectedHeap |
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1099 // so do it here too. |
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1100 _process_strong_tasks->set_n_threads(t); |
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1101 } |
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1102 |
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1103 // Set _n_par_threads according to a policy TBD. |
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1104 void set_par_threads(); |
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1105 |
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1106 void set_n_termination(int t) { |
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1107 _process_strong_tasks->set_n_threads(t); |
342 | 1108 } |
1109 | |
1110 virtual CollectedHeap::Name kind() const { | |
1111 return CollectedHeap::G1CollectedHeap; | |
1112 } | |
1113 | |
1114 // The current policy object for the collector. | |
1115 G1CollectorPolicy* g1_policy() const { return _g1_policy; } | |
1116 | |
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1117 virtual CollectorPolicy* collector_policy() const { return (CollectorPolicy*) g1_policy(); } |
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1118 |
342 | 1119 // Adaptive size policy. No such thing for g1. |
1120 virtual AdaptiveSizePolicy* size_policy() { return NULL; } | |
1121 | |
1122 // The rem set and barrier set. | |
1123 G1RemSet* g1_rem_set() const { return _g1_rem_set; } | |
1124 ModRefBarrierSet* mr_bs() const { return _mr_bs; } | |
1125 | |
1126 unsigned get_gc_time_stamp() { | |
1127 return _gc_time_stamp; | |
1128 } | |
1129 | |
1130 void reset_gc_time_stamp() { | |
1131 _gc_time_stamp = 0; | |
353
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1132 OrderAccess::fence(); |
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1133 // Clear the cached CSet starting regions and time stamps. |
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1134 // Their validity is dependent on the GC timestamp. |
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1135 clear_cset_start_regions(); |
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1136 } |
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1137 |
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1138 void check_gc_time_stamps() PRODUCT_RETURN; |
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1139 |
353
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1140 void increment_gc_time_stamp() { |
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1141 ++_gc_time_stamp; |
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1142 OrderAccess::fence(); |
342 | 1143 } |
1144 | |
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1145 // Reset the given region's GC timestamp. If it's starts humongous, |
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1146 // also reset the GC timestamp of its corresponding |
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1147 // continues humongous regions too. |
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1148 void reset_gc_time_stamps(HeapRegion* hr); |
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1149 |
1705 | 1150 void iterate_dirty_card_closure(CardTableEntryClosure* cl, |
1151 DirtyCardQueue* into_cset_dcq, | |
1152 bool concurrent, int worker_i); | |
342 | 1153 |
1154 // The shared block offset table array. | |
1155 G1BlockOffsetSharedArray* bot_shared() const { return _bot_shared; } | |
1156 | |
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1157 // Reference Processing accessors |
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1158 |
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1159 // The STW reference processor.... |
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1160 ReferenceProcessor* ref_processor_stw() const { return _ref_processor_stw; } |
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1161 |
10405 | 1162 // The Concurrent Marking reference processor... |
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1163 ReferenceProcessor* ref_processor_cm() const { return _ref_processor_cm; } |
342 | 1164 |
10405 | 1165 ConcurrentGCTimer* gc_timer_cm() const { return _gc_timer_cm; } |
1166 G1OldTracer* gc_tracer_cm() const { return _gc_tracer_cm; } | |
1167 | |
342 | 1168 virtual size_t capacity() const; |
1169 virtual size_t used() const; | |
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1170 // This should be called when we're not holding the heap lock. The |
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1171 // result might be a bit inaccurate. |
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1172 size_t used_unlocked() const; |
342 | 1173 size_t recalculate_used() const; |
1174 | |
1175 // These virtual functions do the actual allocation. | |
1176 // Some heaps may offer a contiguous region for shared non-blocking | |
1177 // allocation, via inlined code (by exporting the address of the top and | |
1178 // end fields defining the extent of the contiguous allocation region.) | |
1179 // But G1CollectedHeap doesn't yet support this. | |
1180 | |
1181 // Return an estimate of the maximum allocation that could be performed | |
1182 // without triggering any collection or expansion activity. In a | |
1183 // generational collector, for example, this is probably the largest | |
1184 // allocation that could be supported (without expansion) in the youngest | |
1185 // generation. It is "unsafe" because no locks are taken; the result | |
1186 // should be treated as an approximation, not a guarantee, for use in | |
1187 // heuristic resizing decisions. | |
1188 virtual size_t unsafe_max_alloc(); | |
1189 | |
1190 virtual bool is_maximal_no_gc() const { | |
1191 return _g1_storage.uncommitted_size() == 0; | |
1192 } | |
1193 | |
1194 // The total number of regions in the heap. | |
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1195 uint n_regions() { return _hrs.length(); } |
3766 | 1196 |
1197 // The max number of regions in the heap. | |
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1198 uint max_regions() { return _hrs.max_length(); } |
342 | 1199 |
1200 // The number of regions that are completely free. | |
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1201 uint free_regions() { return _free_list.length(); } |
342 | 1202 |
1203 // The number of regions that are not completely free. | |
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1204 uint used_regions() { return n_regions() - free_regions(); } |
342 | 1205 |
1206 // The number of regions available for "regular" expansion. | |
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1207 uint expansion_regions() { return _expansion_regions; } |
342 | 1208 |
3766 | 1209 // Factory method for HeapRegion instances. It will return NULL if |
1210 // the allocation fails. | |
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1211 HeapRegion* new_heap_region(uint hrs_index, HeapWord* bottom); |
3766 | 1212 |
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1213 void verify_not_dirty_region(HeapRegion* hr) PRODUCT_RETURN; |
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1214 void verify_dirty_region(HeapRegion* hr) PRODUCT_RETURN; |
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1215 void verify_dirty_young_list(HeapRegion* head) PRODUCT_RETURN; |
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1216 void verify_dirty_young_regions() PRODUCT_RETURN; |
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1217 |
2152 | 1218 // verify_region_sets() performs verification over the region |
1219 // lists. It will be compiled in the product code to be used when | |
1220 // necessary (i.e., during heap verification). | |
1221 void verify_region_sets(); | |
342 | 1222 |
2152 | 1223 // verify_region_sets_optional() is planted in the code for |
1224 // list verification in non-product builds (and it can be enabled in | |
10405 | 1225 // product builds by defining HEAP_REGION_SET_FORCE_VERIFY to be 1). |
2152 | 1226 #if HEAP_REGION_SET_FORCE_VERIFY |
1227 void verify_region_sets_optional() { | |
1228 verify_region_sets(); | |
1229 } | |
1230 #else // HEAP_REGION_SET_FORCE_VERIFY | |
1231 void verify_region_sets_optional() { } | |
1232 #endif // HEAP_REGION_SET_FORCE_VERIFY | |
342 | 1233 |
2152 | 1234 #ifdef ASSERT |
2361 | 1235 bool is_on_master_free_list(HeapRegion* hr) { |
2152 | 1236 return hr->containing_set() == &_free_list; |
1237 } | |
342 | 1238 |
2361 | 1239 bool is_in_humongous_set(HeapRegion* hr) { |
2152 | 1240 return hr->containing_set() == &_humongous_set; |
2361 | 1241 } |
2152 | 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 |
2152 | 1247 void secondary_free_list_add_as_tail(FreeRegionList* list) { |
1248 _secondary_free_list.add_as_tail(list); | |
1249 } | |
342 | 1250 |
2152 | 1251 void append_secondary_free_list() { |
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1252 _free_list.add_as_head(&_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 |
4072 | 1264 void old_set_remove(HeapRegion* hr) { |
1265 _old_set.remove(hr); | |
1266 } | |
1267 | |
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1268 size_t non_young_capacity_bytes() { |
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1269 return _old_set.total_capacity_bytes() + _humongous_set.total_capacity_bytes(); |
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1270 } |
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1271 |
2152 | 1272 void set_free_regions_coming(); |
1273 void reset_free_regions_coming(); | |
1274 bool free_regions_coming() { return _free_regions_coming; } | |
1275 void wait_while_free_regions_coming(); | |
342 | 1276 |
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1277 // Determine whether the given region is one that we are using as an |
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1278 // old GC alloc region. |
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1279 bool is_old_gc_alloc_region(HeapRegion* hr) { |
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1280 return hr == _retained_old_gc_alloc_region; |
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1281 } |
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1282 |
342 | 1283 // Perform a collection of the heap; intended for use in implementing |
1284 // "System.gc". This probably implies as full a collection as the | |
1285 // "CollectedHeap" supports. | |
1286 virtual void collect(GCCause::Cause cause); | |
1287 | |
1288 // The same as above but assume that the caller holds the Heap_lock. | |
1289 void collect_locked(GCCause::Cause cause); | |
1290 | |
10405 | 1291 // True iff an evacuation has failed in the most-recent collection. |
342 | 1292 bool evacuation_failed() { return _evacuation_failed; } |
1293 | |
2152 | 1294 // It will free a region if it has allocated objects in it that are |
1295 // all dead. It calls either free_region() or | |
1296 // free_humongous_region() depending on the type of the region that | |
1297 // is passed to it. | |
2173 | 1298 void free_region_if_empty(HeapRegion* hr, |
1299 size_t* pre_used, | |
1300 FreeRegionList* free_list, | |
4072 | 1301 OldRegionSet* old_proxy_set, |
2173 | 1302 HumongousRegionSet* humongous_proxy_set, |
1303 HRRSCleanupTask* hrrs_cleanup_task, | |
1304 bool par); | |
342 | 1305 |
2152 | 1306 // It appends the free list to the master free list and updates the |
1307 // master humongous list according to the contents of the proxy | |
1308 // list. It also adjusts the total used bytes according to pre_used | |
1309 // (if par is true, it will do so by taking the ParGCRareEvent_lock). | |
1310 void update_sets_after_freeing_regions(size_t pre_used, | |
1311 FreeRegionList* free_list, | |
4072 | 1312 OldRegionSet* old_proxy_set, |
2152 | 1313 HumongousRegionSet* humongous_proxy_set, |
1314 bool par); | |
342 | 1315 |
4708 | 1316 // Returns "TRUE" iff "p" points into the committed areas of the heap. |
342 | 1317 virtual bool is_in(const void* p) const; |
1318 | |
1319 // Return "TRUE" iff the given object address is within the collection | |
1320 // set. | |
1321 inline bool obj_in_cs(oop obj); | |
1322 | |
1323 // Return "TRUE" iff the given object address is in the reserved | |
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1324 // region of g1. |
342 | 1325 bool is_in_g1_reserved(const void* p) const { |
1326 return _g1_reserved.contains(p); | |
1327 } | |
1328 | |
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1329 // Returns a MemRegion that corresponds to the space that has been |
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1330 // reserved for the heap |
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1331 MemRegion g1_reserved() { |
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1332 return _g1_reserved; |
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1333 } |
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1334 |
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1335 // Returns a MemRegion that corresponds to the space that has been |
342 | 1336 // committed in the heap |
1337 MemRegion g1_committed() { | |
1338 return _g1_committed; | |
1339 } | |
1340 | |
2311 | 1341 virtual bool is_in_closed_subset(const void* p) const; |
342 | 1342 |
1343 // This resets the card table to all zeros. It is used after | |
1344 // a collection pause which used the card table to claim cards. | |
1345 void cleanUpCardTable(); | |
1346 | |
1347 // Iteration functions. | |
1348 | |
1349 // Iterate over all the ref-containing fields of all objects, calling | |
1350 // "cl.do_oop" on each. | |
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1351 virtual void oop_iterate(ExtendedOopClosure* cl); |
342 | 1352 |
1353 // Same as above, restricted to a memory region. | |
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1354 void oop_iterate(MemRegion mr, ExtendedOopClosure* cl); |
342 | 1355 |
1356 // Iterate over all objects, calling "cl.do_object" on each. | |
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1357 virtual void object_iterate(ObjectClosure* cl); |
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1358 |
678 | 1359 virtual void safe_object_iterate(ObjectClosure* cl) { |
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1360 object_iterate(cl); |
678 | 1361 } |
342 | 1362 |
1363 // Iterate over all objects allocated since the last collection, calling | |
1364 // "cl.do_object" on each. The heap must have been initialized properly | |
1365 // to support this function, or else this call will fail. | |
1366 virtual void object_iterate_since_last_GC(ObjectClosure* cl); | |
1367 | |
1368 // Iterate over all spaces in use in the heap, in ascending address order. | |
1369 virtual void space_iterate(SpaceClosure* cl); | |
1370 | |
1371 // Iterate over heap regions, in address order, terminating the | |
1372 // iteration early if the "doHeapRegion" method returns "true". | |
3766 | 1373 void heap_region_iterate(HeapRegionClosure* blk) const; |
342 | 1374 |
3766 | 1375 // Return the region with the given index. It assumes the index is valid. |
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1376 HeapRegion* region_at(uint index) const { return _hrs.at(index); } |
342 | 1377 |
1378 // Divide the heap region sequence into "chunks" of some size (the number | |
1379 // of regions divided by the number of parallel threads times some | |
1380 // overpartition factor, currently 4). Assumes that this will be called | |
1381 // in parallel by ParallelGCThreads worker threads with discinct worker | |
1382 // ids in the range [0..max(ParallelGCThreads-1, 1)], that all parallel | |
1383 // calls will use the same "claim_value", and that that claim value is | |
1384 // different from the claim_value of any heap region before the start of | |
1385 // the iteration. Applies "blk->doHeapRegion" to each of the regions, by | |
1386 // attempting to claim the first region in each chunk, and, if | |
1387 // successful, applying the closure to each region in the chunk (and | |
1388 // setting the claim value of the second and subsequent regions of the | |
1389 // chunk.) For now requires that "doHeapRegion" always returns "false", | |
1390 // i.e., that a closure never attempt to abort a traversal. | |
1391 void heap_region_par_iterate_chunked(HeapRegionClosure* blk, | |
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1392 uint worker, |
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1393 uint no_of_par_workers, |
342 | 1394 jint claim_value); |
1395 | |
390 | 1396 // It resets all the region claim values to the default. |
1397 void reset_heap_region_claim_values(); | |
1398 | |
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1399 // Resets the claim values of regions in the current |
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1400 // collection set to the default. |
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1401 void reset_cset_heap_region_claim_values(); |
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1402 |
355 | 1403 #ifdef ASSERT |
1404 bool check_heap_region_claim_values(jint claim_value); | |
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1405 |
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1406 // Same as the routine above but only checks regions in the |
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1407 // current collection set. |
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1408 bool check_cset_heap_region_claim_values(jint claim_value); |
355 | 1409 #endif // ASSERT |
1410 | |
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1411 // Clear the cached cset start regions and (more importantly) |
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1412 // the time stamps. Called when we reset the GC time stamp. |
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1413 void clear_cset_start_regions(); |
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1414 |
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1415 // Given the id of a worker, obtain or calculate a suitable |
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1416 // starting region for iterating over the current collection set. |
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1417 HeapRegion* start_cset_region_for_worker(int worker_i); |
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1418 |
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1419 // This is a convenience method that is used by the |
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1420 // HeapRegionIterator classes to calculate the starting region for |
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1421 // each worker so that they do not all start from the same region. |
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1422 HeapRegion* start_region_for_worker(uint worker_i, uint no_of_par_workers); |
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1423 |
342 | 1424 // Iterate over the regions (if any) in the current collection set. |
1425 void collection_set_iterate(HeapRegionClosure* blk); | |
1426 | |
1427 // As above but starting from region r | |
1428 void collection_set_iterate_from(HeapRegion* r, HeapRegionClosure *blk); | |
1429 | |
1430 // Returns the first (lowest address) compactible space in the heap. | |
1431 virtual CompactibleSpace* first_compactible_space(); | |
1432 | |
1433 // A CollectedHeap will contain some number of spaces. This finds the | |
1434 // space containing a given address, or else returns NULL. | |
1435 virtual Space* space_containing(const void* addr) const; | |
1436 | |
1437 // A G1CollectedHeap will contain some number of heap regions. This | |
1438 // finds the region containing a given address, or else returns NULL. | |
3766 | 1439 template <class T> |
1440 inline HeapRegion* heap_region_containing(const T addr) const; | |
342 | 1441 |
1442 // Like the above, but requires "addr" to be in the heap (to avoid a | |
1443 // null-check), and unlike the above, may return an continuing humongous | |
1444 // region. | |
3766 | 1445 template <class T> |
1446 inline HeapRegion* heap_region_containing_raw(const T addr) const; | |
342 | 1447 |
1448 // A CollectedHeap is divided into a dense sequence of "blocks"; that is, | |
1449 // each address in the (reserved) heap is a member of exactly | |
1450 // one block. The defining characteristic of a block is that it is | |
1451 // possible to find its size, and thus to progress forward to the next | |
1452 // block. (Blocks may be of different sizes.) Thus, blocks may | |
1453 // represent Java objects, or they might be free blocks in a | |
1454 // free-list-based heap (or subheap), as long as the two kinds are | |
1455 // distinguishable and the size of each is determinable. | |
1456 | |
1457 // Returns the address of the start of the "block" that contains the | |
1458 // address "addr". We say "blocks" instead of "object" since some heaps | |
1459 // may not pack objects densely; a chunk may either be an object or a | |
1460 // non-object. | |
1461 virtual HeapWord* block_start(const void* addr) const; | |
1462 | |
1463 // Requires "addr" to be the start of a chunk, and returns its size. | |
1464 // "addr + size" is required to be the start of a new chunk, or the end | |
1465 // of the active area of the heap. | |
1466 virtual size_t block_size(const HeapWord* addr) const; | |
1467 | |
1468 // Requires "addr" to be the start of a block, and returns "TRUE" iff | |
1469 // the block is an object. | |
1470 virtual bool block_is_obj(const HeapWord* addr) const; | |
1471 | |
1472 // Does this heap support heap inspection? (+PrintClassHistogram) | |
1473 virtual bool supports_heap_inspection() const { return true; } | |
1474 | |
1475 // Section on thread-local allocation buffers (TLABs) | |
1476 // See CollectedHeap for semantics. | |
1477 | |
1478 virtual bool supports_tlab_allocation() const; | |
1479 virtual size_t tlab_capacity(Thread* thr) const; | |
1480 virtual size_t unsafe_max_tlab_alloc(Thread* thr) const; | |
1481 | |
1482 // Can a compiler initialize a new object without store barriers? | |
1483 // This permission only extends from the creation of a new object | |
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1484 // via a TLAB up to the first subsequent safepoint. If such permission |
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1485 // is granted for this heap type, the compiler promises to call |
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1486 // defer_store_barrier() below on any slow path allocation of |
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1487 // a new object for which such initializing store barriers will |
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1488 // have been elided. G1, like CMS, allows this, but should be |
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1489 // ready to provide a compensating write barrier as necessary |
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1490 // if that storage came out of a non-young region. The efficiency |
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1491 // of this implementation depends crucially on being able to |
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1492 // answer very efficiently in constant time whether a piece of |
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1493 // storage in the heap comes from a young region or not. |
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1494 // See ReduceInitialCardMarks. |
342 | 1495 virtual bool can_elide_tlab_store_barriers() const { |
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1496 return true; |
1027
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1497 } |
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1498 |
1166 | 1499 virtual bool card_mark_must_follow_store() const { |
1500 return true; | |
1501 } | |
1502 | |
3766 | 1503 bool is_in_young(const oop obj) { |
1027
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1504 HeapRegion* hr = heap_region_containing(obj); |
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1505 return hr != NULL && hr->is_young(); |
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1506 } |
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1507 |
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1508 #ifdef ASSERT |
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1509 virtual bool is_in_partial_collection(const void* p); |
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1510 #endif |
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1511 |
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1512 virtual bool is_scavengable(const void* addr); |
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1513 |
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1514 // We don't need barriers for initializing stores to objects |
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1515 // in the young gen: for the SATB pre-barrier, there is no |
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1516 // pre-value that needs to be remembered; for the remembered-set |
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1517 // update logging post-barrier, we don't maintain remembered set |
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1518 // information for young gen objects. |
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1519 virtual bool can_elide_initializing_store_barrier(oop new_obj) { |
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1520 return is_in_young(new_obj); |
342 | 1521 } |
1522 | |
1523 // Returns "true" iff the given word_size is "very large". | |
1524 static bool isHumongous(size_t word_size) { | |
1313
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1525 // Note this has to be strictly greater-than as the TLABs |
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1526 // are capped at the humongous thresold and we want to |
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1527 // ensure that we don't try to allocate a TLAB as |
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1528 // humongous and that we don't allocate a humongous |
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1529 // object in a TLAB. |
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1530 return word_size > _humongous_object_threshold_in_words; |
342 | 1531 } |
1532 | |
1533 // Update mod union table with the set of dirty cards. | |
1534 void updateModUnion(); | |
1535 | |
1536 // Set the mod union bits corresponding to the given memRegion. Note | |
1537 // that this is always a safe operation, since it doesn't clear any | |
1538 // bits. | |
1539 void markModUnionRange(MemRegion mr); | |
1540 | |
1541 // Records the fact that a marking phase is no longer in progress. | |
1542 void set_marking_complete() { | |
1543 _mark_in_progress = false; | |
1544 } | |
1545 void set_marking_started() { | |
1546 _mark_in_progress = true; | |
1547 } | |
1548 bool mark_in_progress() { | |
1549 return _mark_in_progress; | |
1550 } | |
1551 | |
1552 // Print the maximum heap capacity. | |
1553 virtual size_t max_capacity() const; | |
1554 | |
1555 virtual jlong millis_since_last_gc(); | |
1556 | |
1557 // Perform any cleanup actions necessary before allowing a verification. | |
1558 virtual void prepare_for_verify(); | |
1559 | |
1560 // Perform verification. | |
811 | 1561 |
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1562 // vo == UsePrevMarking -> use "prev" marking information, |
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1563 // vo == UseNextMarking -> use "next" marking information |
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1564 // vo == UseMarkWord -> use the mark word in the object header |
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1565 // |
811 | 1566 // NOTE: Only the "prev" marking information is guaranteed to be |
1567 // consistent most of the time, so most calls to this should use | |
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1568 // vo == UsePrevMarking. |
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1569 // Currently, there is only one case where this is called with |
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1570 // vo == UseNextMarking, which is to verify the "next" marking |
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1571 // information at the end of remark. |
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1572 // Currently there is only one place where this is called with |
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1573 // vo == UseMarkWord, which is to verify the marking during a |
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1574 // full GC. |
6008 | 1575 void verify(bool silent, VerifyOption vo); |
811 | 1576 |
1577 // Override; it uses the "prev" marking information | |
6008 | 1578 virtual void verify(bool silent); |
10405 | 1579 |
342 | 1580 virtual void print_on(outputStream* st) const; |
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1581 virtual void print_extended_on(outputStream* st) const; |
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1582 virtual void print_on_error(outputStream* st) const; |
342 | 1583 |
1584 virtual void print_gc_threads_on(outputStream* st) const; | |
1585 virtual void gc_threads_do(ThreadClosure* tc) const; | |
1586 | |
1587 // Override | |
1588 void print_tracing_info() const; | |
1589 | |
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1590 // The following two methods are helpful for debugging RSet issues. |
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1591 void print_cset_rsets() PRODUCT_RETURN; |
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1592 void print_all_rsets() PRODUCT_RETURN; |
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1593 |
342 | 1594 // Convenience function to be used in situations where the heap type can be |
1595 // asserted to be this type. | |
1596 static G1CollectedHeap* heap(); | |
1597 | |
1598 void set_region_short_lived_locked(HeapRegion* hr); | |
1599 // add appropriate methods for any other surv rate groups | |
1600 | |
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1601 YoungList* young_list() { return _young_list; } |
342 | 1602 |
1603 // debugging | |
1604 bool check_young_list_well_formed() { | |
1605 return _young_list->check_list_well_formed(); | |
1606 } | |
1394
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1607 |
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1608 bool check_young_list_empty(bool check_heap, |
342 | 1609 bool check_sample = true); |
1610 | |
1611 // *** Stuff related to concurrent marking. It's not clear to me that so | |
1612 // many of these need to be public. | |
1613 | |
1614 // The functions below are helper functions that a subclass of | |
1615 // "CollectedHeap" can use in the implementation of its virtual | |
1616 // functions. | |
1617 // This performs a concurrent marking of the live objects in a | |
1618 // bitmap off to the side. | |
1619 void doConcurrentMark(); | |
1620 | |
1621 bool isMarkedPrev(oop obj) const; | |
1622 bool isMarkedNext(oop obj) const; | |
1623 | |
1624 // Determine if an object is dead, given the object and also | |
1625 // the region to which the object belongs. An object is dead | |
1626 // iff a) it was not allocated since the last mark and b) it | |
1627 // is not marked. | |
1628 | |
1629 bool is_obj_dead(const oop obj, const HeapRegion* hr) const { | |
1630 return | |
1631 !hr->obj_allocated_since_prev_marking(obj) && | |
1632 !isMarkedPrev(obj); | |
1633 } | |
1634 | |
1635 // This function returns true when an object has been | |
1636 // around since the previous marking and hasn't yet | |
1637 // been marked during this marking. | |
1638 | |
1639 bool is_obj_ill(const oop obj, const HeapRegion* hr) const { | |
1640 return | |
1641 !hr->obj_allocated_since_next_marking(obj) && | |
1642 !isMarkedNext(obj); | |
1643 } | |
1644 | |
1645 // Determine if an object is dead, given only the object itself. | |
1646 // This will find the region to which the object belongs and | |
1647 // then call the region version of the same function. | |
1648 | |
1649 // Added if it is NULL it isn't dead. | |
1650 | |
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1651 bool is_obj_dead(const oop obj) const { |
811 | 1652 const HeapRegion* hr = heap_region_containing(obj); |
342 | 1653 if (hr == NULL) { |
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1654 if (obj == NULL) return false; |
342 | 1655 else return true; |
1656 } | |
1657 else return is_obj_dead(obj, hr); | |
1658 } | |
1659 | |
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1660 bool is_obj_ill(const oop obj) const { |
811 | 1661 const HeapRegion* hr = heap_region_containing(obj); |
342 | 1662 if (hr == NULL) { |
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1663 if (obj == NULL) return false; |
342 | 1664 else return true; |
1665 } | |
1666 else return is_obj_ill(obj, hr); | |
1667 } | |
1668 | |
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1669 // The methods below are here for convenience and dispatch the |
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1670 // appropriate method depending on value of the given VerifyOption |
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1671 // parameter. The options for that parameter are: |
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1672 // |
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1673 // vo == UsePrevMarking -> use "prev" marking information, |
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1674 // vo == UseNextMarking -> use "next" marking information, |
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1675 // vo == UseMarkWord -> use mark word from object header |
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1676 |
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1677 bool is_obj_dead_cond(const oop obj, |
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1678 const HeapRegion* hr, |
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1679 const VerifyOption vo) const { |
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1680 switch (vo) { |
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1681 case VerifyOption_G1UsePrevMarking: return is_obj_dead(obj, hr); |
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1682 case VerifyOption_G1UseNextMarking: return is_obj_ill(obj, hr); |
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1683 case VerifyOption_G1UseMarkWord: return !obj->is_gc_marked(); |
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1684 default: ShouldNotReachHere(); |
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1685 } |
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1686 return false; // keep some compilers happy |
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1687 } |
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1688 |
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1689 bool is_obj_dead_cond(const oop obj, |
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1690 const VerifyOption vo) const { |
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1691 switch (vo) { |
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1692 case VerifyOption_G1UsePrevMarking: return is_obj_dead(obj); |
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1693 case VerifyOption_G1UseNextMarking: return is_obj_ill(obj); |
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1694 case VerifyOption_G1UseMarkWord: return !obj->is_gc_marked(); |
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1695 default: ShouldNotReachHere(); |
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1696 } |
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1697 return false; // keep some compilers happy |
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1698 } |
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1699 |
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1700 bool allocated_since_marking(oop obj, HeapRegion* hr, VerifyOption vo); |
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1701 HeapWord* top_at_mark_start(HeapRegion* hr, VerifyOption vo); |
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1702 bool is_marked(oop obj, VerifyOption vo); |
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1703 const char* top_at_mark_start_str(VerifyOption vo); |
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1704 |
342 | 1705 // The following is just to alert the verification code |
1706 // that a full collection has occurred and that the | |
1707 // remembered sets are no longer up to date. | |
1708 bool _full_collection; | |
1709 void set_full_collection() { _full_collection = true;} | |
1710 void clear_full_collection() {_full_collection = false;} | |
1711 bool full_collection() {return _full_collection;} | |
1712 | |
1713 ConcurrentMark* concurrent_mark() const { return _cm; } | |
1714 ConcurrentG1Refine* concurrent_g1_refine() const { return _cg1r; } | |
1715 | |
796
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1716 // The dirty cards region list is used to record a subset of regions |
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1717 // whose cards need clearing. The list if populated during the |
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1718 // remembered set scanning and drained during the card table |
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1719 // cleanup. Although the methods are reentrant, population/draining |
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1720 // phases must not overlap. For synchronization purposes the last |
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1721 // element on the list points to itself. |
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1722 HeapRegion* _dirty_cards_region_list; |
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1723 void push_dirty_cards_region(HeapRegion* hr); |
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1724 HeapRegion* pop_dirty_cards_region(); |
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1725 |
342 | 1726 public: |
1727 void stop_conc_gc_threads(); | |
1728 | |
1729 size_t pending_card_num(); | |
1730 size_t cards_scanned(); | |
1731 | |
1732 protected: | |
1733 size_t _max_heap_capacity; | |
1734 }; | |
1735 | |
845
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1736 class G1ParGCAllocBuffer: public ParGCAllocBuffer { |
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1737 private: |
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1738 bool _retired; |
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1739 |
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1740 public: |
3886
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1741 G1ParGCAllocBuffer(size_t gclab_word_size); |
845
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1742 |
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1743 void set_buf(HeapWord* buf) { |
845
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1744 ParGCAllocBuffer::set_buf(buf); |
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1745 _retired = false; |
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1746 } |
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1747 |
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1748 void retire(bool end_of_gc, bool retain) { |
845
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1749 if (_retired) |
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1750 return; |
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1751 ParGCAllocBuffer::retire(end_of_gc, retain); |
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|
1752 _retired = true; |
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|
1753 } |
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1754 |
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1755 bool is_retired() { |
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1756 return _retired; |
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1757 } |
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1758 }; |
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1759 |
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1760 class G1ParGCAllocBufferContainer { |
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1761 protected: |
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1762 static int const _priority_max = 2; |
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1763 G1ParGCAllocBuffer* _priority_buffer[_priority_max]; |
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1764 |
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1765 public: |
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1766 G1ParGCAllocBufferContainer(size_t gclab_word_size) { |
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1767 for (int pr = 0; pr < _priority_max; ++pr) { |
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1768 _priority_buffer[pr] = new G1ParGCAllocBuffer(gclab_word_size); |
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1769 } |
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|
1770 } |
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|
1771 |
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1772 ~G1ParGCAllocBufferContainer() { |
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1773 for (int pr = 0; pr < _priority_max; ++pr) { |
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1774 assert(_priority_buffer[pr]->is_retired(), "alloc buffers should all retire at this point."); |
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1775 delete _priority_buffer[pr]; |
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1776 } |
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|
1777 } |
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1778 |
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1779 HeapWord* allocate(size_t word_sz) { |
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1780 HeapWord* obj; |
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1781 for (int pr = 0; pr < _priority_max; ++pr) { |
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1782 obj = _priority_buffer[pr]->allocate(word_sz); |
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1783 if (obj != NULL) return obj; |
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|
1784 } |
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1785 return obj; |
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|
1786 } |
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|
1787 |
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1788 bool contains(void* addr) { |
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1789 for (int pr = 0; pr < _priority_max; ++pr) { |
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1790 if (_priority_buffer[pr]->contains(addr)) return true; |
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|
1791 } |
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|
1792 return false; |
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|
1793 } |
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|
1794 |
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1795 void undo_allocation(HeapWord* obj, size_t word_sz) { |
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|
1796 bool finish_undo; |
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1797 for (int pr = 0; pr < _priority_max; ++pr) { |
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1798 if (_priority_buffer[pr]->contains(obj)) { |
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1799 _priority_buffer[pr]->undo_allocation(obj, word_sz); |
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1800 finish_undo = true; |
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1801 } |
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1802 } |
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1803 if (!finish_undo) ShouldNotReachHere(); |
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1804 } |
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1805 |
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1806 size_t words_remaining() { |
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1807 size_t result = 0; |
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1808 for (int pr = 0; pr < _priority_max; ++pr) { |
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1809 result += _priority_buffer[pr]->words_remaining(); |
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1810 } |
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1811 return result; |
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|
1812 } |
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1813 |
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1814 size_t words_remaining_in_retired_buffer() { |
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1815 G1ParGCAllocBuffer* retired = _priority_buffer[0]; |
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1816 return retired->words_remaining(); |
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1817 } |
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1818 |
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1819 void flush_stats_and_retire(PLABStats* stats, bool end_of_gc, bool retain) { |
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1820 for (int pr = 0; pr < _priority_max; ++pr) { |
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1821 _priority_buffer[pr]->flush_stats_and_retire(stats, end_of_gc, retain); |
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1822 } |
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1823 } |
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1824 |
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1825 void update(bool end_of_gc, bool retain, HeapWord* buf, size_t word_sz) { |
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1826 G1ParGCAllocBuffer* retired_and_set = _priority_buffer[0]; |
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1827 retired_and_set->retire(end_of_gc, retain); |
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1828 retired_and_set->set_buf(buf); |
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1829 retired_and_set->set_word_size(word_sz); |
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1830 adjust_priority_order(); |
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1831 } |
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1832 |
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1833 private: |
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1834 void adjust_priority_order() { |
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1835 G1ParGCAllocBuffer* retired_and_set = _priority_buffer[0]; |
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1836 |
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1837 int last = _priority_max - 1; |
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1838 for (int pr = 0; pr < last; ++pr) { |
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1839 _priority_buffer[pr] = _priority_buffer[pr + 1]; |
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1840 } |
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1841 _priority_buffer[last] = retired_and_set; |
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1842 } |
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1843 }; |
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1844 |
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1845 class G1ParScanThreadState : public StackObj { |
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1846 protected: |
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1847 G1CollectedHeap* _g1h; |
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1848 RefToScanQueue* _refs; |
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1849 DirtyCardQueue _dcq; |
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1850 CardTableModRefBS* _ct_bs; |
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1851 G1RemSet* _g1_rem; |
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1852 |
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1853 G1ParGCAllocBufferContainer _surviving_alloc_buffer; |
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1854 G1ParGCAllocBufferContainer _tenured_alloc_buffer; |
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1855 G1ParGCAllocBufferContainer* _alloc_buffers[GCAllocPurposeCount]; |
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1856 ageTable _age_table; |
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1857 |
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1858 size_t _alloc_buffer_waste; |
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1859 size_t _undo_waste; |
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1860 |
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1861 OopsInHeapRegionClosure* _evac_failure_cl; |
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1862 G1ParScanHeapEvacClosure* _evac_cl; |
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1863 G1ParScanPartialArrayClosure* _partial_scan_cl; |
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1864 |
10405 | 1865 int _hash_seed; |
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1866 uint _queue_num; |
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1867 |
1611 | 1868 size_t _term_attempts; |
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1869 |
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1870 double _start; |
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1871 double _start_strong_roots; |
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1872 double _strong_roots_time; |
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1873 double _start_term; |
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1874 double _term_time; |
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1875 |
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1876 // Map from young-age-index (0 == not young, 1 is youngest) to |
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1877 // surviving words. base is what we get back from the malloc call |
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1878 size_t* _surviving_young_words_base; |
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1879 // this points into the array, as we use the first few entries for padding |
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1880 size_t* _surviving_young_words; |
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1881 |
1709 | 1882 #define PADDING_ELEM_NUM (DEFAULT_CACHE_LINE_SIZE / sizeof(size_t)) |
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1883 |
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1884 void add_to_alloc_buffer_waste(size_t waste) { _alloc_buffer_waste += waste; } |
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1885 |
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1886 void add_to_undo_waste(size_t waste) { _undo_waste += waste; } |
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1887 |
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1888 DirtyCardQueue& dirty_card_queue() { return _dcq; } |
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1889 CardTableModRefBS* ctbs() { return _ct_bs; } |
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1890 |
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1891 template <class T> void immediate_rs_update(HeapRegion* from, T* p, int tid) { |
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1892 if (!from->is_survivor()) { |
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1893 _g1_rem->par_write_ref(from, p, tid); |
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1894 } |
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1895 } |
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1896 |
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1897 template <class T> void deferred_rs_update(HeapRegion* from, T* p, int tid) { |
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1898 // If the new value of the field points to the same region or |
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1899 // is the to-space, we don't need to include it in the Rset updates. |
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1900 if (!from->is_in_reserved(oopDesc::load_decode_heap_oop(p)) && !from->is_survivor()) { |
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1901 size_t card_index = ctbs()->index_for(p); |
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1902 // If the card hasn't been added to the buffer, do it. |
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1903 if (ctbs()->mark_card_deferred(card_index)) { |
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1904 dirty_card_queue().enqueue((jbyte*)ctbs()->byte_for_index(card_index)); |
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1905 } |
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1906 } |
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1907 } |
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1908 |
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1909 public: |
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1910 G1ParScanThreadState(G1CollectedHeap* g1h, uint queue_num); |
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1911 |
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1912 ~G1ParScanThreadState() { |
6197 | 1913 FREE_C_HEAP_ARRAY(size_t, _surviving_young_words_base, mtGC); |
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1914 } |
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1915 |
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1916 RefToScanQueue* refs() { return _refs; } |
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1917 ageTable* age_table() { return &_age_table; } |
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1918 |
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1919 G1ParGCAllocBufferContainer* alloc_buffer(GCAllocPurpose purpose) { |
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1920 return _alloc_buffers[purpose]; |
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1921 } |
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1922 |
1709 | 1923 size_t alloc_buffer_waste() const { return _alloc_buffer_waste; } |
1924 size_t undo_waste() const { return _undo_waste; } | |
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1925 |
1862
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1926 #ifdef ASSERT |
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1927 bool verify_ref(narrowOop* ref) const; |
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1928 bool verify_ref(oop* ref) const; |
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1929 bool verify_task(StarTask ref) const; |
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1930 #endif // ASSERT |
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1931 |
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1932 template <class T> void push_on_queue(T* ref) { |
1862
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1933 assert(verify_ref(ref), "sanity"); |
1709 | 1934 refs()->push(ref); |
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1935 } |
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1936 |
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1937 template <class T> void update_rs(HeapRegion* from, T* p, int tid) { |
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1938 if (G1DeferredRSUpdate) { |
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1939 deferred_rs_update(from, p, tid); |
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1940 } else { |
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1941 immediate_rs_update(from, p, tid); |
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1942 } |
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1943 } |
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1944 |
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1945 HeapWord* allocate_slow(GCAllocPurpose purpose, size_t word_sz) { |
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1946 HeapWord* obj = NULL; |
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1947 size_t gclab_word_size = _g1h->desired_plab_sz(purpose); |
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1948 if (word_sz * 100 < gclab_word_size * ParallelGCBufferWastePct) { |
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1949 G1ParGCAllocBufferContainer* alloc_buf = alloc_buffer(purpose); |
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1950 |
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1951 HeapWord* buf = _g1h->par_allocate_during_gc(purpose, gclab_word_size); |
845
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1952 if (buf == NULL) return NULL; // Let caller handle allocation failure. |
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1953 |
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1954 add_to_alloc_buffer_waste(alloc_buf->words_remaining_in_retired_buffer()); |
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1955 alloc_buf->update(false /* end_of_gc */, false /* retain */, buf, gclab_word_size); |
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1956 |
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1957 obj = alloc_buf->allocate(word_sz); |
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1958 assert(obj != NULL, "buffer was definitely big enough..."); |
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1959 } else { |
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1960 obj = _g1h->par_allocate_during_gc(purpose, word_sz); |
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1961 } |
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1962 return obj; |
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1963 } |
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1964 |
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1965 HeapWord* allocate(GCAllocPurpose purpose, size_t word_sz) { |
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1966 HeapWord* obj = alloc_buffer(purpose)->allocate(word_sz); |
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1967 if (obj != NULL) return obj; |
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1968 return allocate_slow(purpose, word_sz); |
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1969 } |
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1970 |
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1971 void undo_allocation(GCAllocPurpose purpose, HeapWord* obj, size_t word_sz) { |
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1972 if (alloc_buffer(purpose)->contains(obj)) { |
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1973 assert(alloc_buffer(purpose)->contains(obj + word_sz - 1), |
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1974 "should contain whole object"); |
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1975 alloc_buffer(purpose)->undo_allocation(obj, word_sz); |
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1976 } else { |
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1977 CollectedHeap::fill_with_object(obj, word_sz); |
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1978 add_to_undo_waste(word_sz); |
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1979 } |
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1980 } |
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1981 |
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1982 void set_evac_failure_closure(OopsInHeapRegionClosure* evac_failure_cl) { |
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1983 _evac_failure_cl = evac_failure_cl; |
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1984 } |
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1985 OopsInHeapRegionClosure* evac_failure_closure() { |
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1986 return _evac_failure_cl; |
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1987 } |
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1988 |
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1989 void set_evac_closure(G1ParScanHeapEvacClosure* evac_cl) { |
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1990 _evac_cl = evac_cl; |
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1991 } |
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1992 |
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1993 void set_partial_scan_closure(G1ParScanPartialArrayClosure* partial_scan_cl) { |
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1994 _partial_scan_cl = partial_scan_cl; |
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1995 } |
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1996 |
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1997 int* hash_seed() { return &_hash_seed; } |
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1998 uint queue_num() { return _queue_num; } |
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1999 |
1709 | 2000 size_t term_attempts() const { return _term_attempts; } |
1611 | 2001 void note_term_attempt() { _term_attempts++; } |
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2002 |
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2003 void start_strong_roots() { |
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2004 _start_strong_roots = os::elapsedTime(); |
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2005 } |
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2006 void end_strong_roots() { |
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2007 _strong_roots_time += (os::elapsedTime() - _start_strong_roots); |
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2008 } |
1709 | 2009 double strong_roots_time() const { return _strong_roots_time; } |
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2010 |
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2011 void start_term_time() { |
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2012 note_term_attempt(); |
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2013 _start_term = os::elapsedTime(); |
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2014 } |
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2015 void end_term_time() { |
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2016 _term_time += (os::elapsedTime() - _start_term); |
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2017 } |
1709 | 2018 double term_time() const { return _term_time; } |
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2019 |
1709 | 2020 double elapsed_time() const { |
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2021 return os::elapsedTime() - _start; |
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2022 } |
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2023 |
1709 | 2024 static void |
2025 print_termination_stats_hdr(outputStream* const st = gclog_or_tty); | |
2026 void | |
2027 print_termination_stats(int i, outputStream* const st = gclog_or_tty) const; | |
2028 | |
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2029 size_t* surviving_young_words() { |
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2030 // We add on to hide entry 0 which accumulates surviving words for |
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2031 // age -1 regions (i.e. non-young ones) |
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2032 return _surviving_young_words; |
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2033 } |
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2034 |
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2035 void retire_alloc_buffers() { |
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2036 for (int ap = 0; ap < GCAllocPurposeCount; ++ap) { |
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2037 size_t waste = _alloc_buffers[ap]->words_remaining(); |
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2038 add_to_alloc_buffer_waste(waste); |
6595 | 2039 _alloc_buffers[ap]->flush_stats_and_retire(_g1h->stats_for_purpose((GCAllocPurpose)ap), |
2040 true /* end_of_gc */, | |
2041 false /* retain */); | |
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2042 } |
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2043 } |
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2044 |
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2045 template <class T> void deal_with_reference(T* ref_to_scan) { |
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2046 if (has_partial_array_mask(ref_to_scan)) { |
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2047 _partial_scan_cl->do_oop_nv(ref_to_scan); |
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2048 } else { |
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2049 // Note: we can use "raw" versions of "region_containing" because |
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2050 // "obj_to_scan" is definitely in the heap, and is not in a |
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2051 // humongous region. |
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2052 HeapRegion* r = _g1h->heap_region_containing_raw(ref_to_scan); |
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2053 _evac_cl->set_region(r); |
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2054 _evac_cl->do_oop_nv(ref_to_scan); |
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2055 } |
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2056 } |
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2057 |
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2058 void deal_with_reference(StarTask ref) { |
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2059 assert(verify_task(ref), "sanity"); |
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2060 if (ref.is_narrow()) { |
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2061 deal_with_reference((narrowOop*)ref); |
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2062 } else { |
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2063 deal_with_reference((oop*)ref); |
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2064 } |
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2065 } |
1862
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2066 |
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2067 void trim_queue(); |
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2068 }; |
1972 | 2069 |
2070 #endif // SHARE_VM_GC_IMPLEMENTATION_G1_G1COLLECTEDHEAP_HPP |