Mercurial > hg > truffle
annotate src/share/vm/gc_implementation/g1/g1CollectedHeap.hpp @ 8081:579f6adb7f51
8003539: Minimal VM don't react to -Dcom.sun.management and -XX:+ManagementServer
Summary: A warning message should be displayed if these options are used with the Minimal VM.
Reviewed-by: dholmes, dsamersoff
author | jprovino |
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date | Tue, 05 Feb 2013 13:32:34 -0500 |
parents | 2e6857353b2c |
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342 | 1 /* |
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2 * Copyright (c) 2001, 2012, Oracle and/or its affiliates. All rights reserved. |
342 | 3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
4 * | |
5 * This code is free software; you can redistribute it and/or modify it | |
6 * under the terms of the GNU General Public License version 2 only, as | |
7 * published by the Free Software Foundation. | |
8 * | |
9 * This code is distributed in the hope that it will be useful, but WITHOUT | |
10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or | |
11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License | |
12 * version 2 for more details (a copy is included in the LICENSE file that | |
13 * accompanied this code). | |
14 * | |
15 * You should have received a copy of the GNU General Public License version | |
16 * 2 along with this work; if not, write to the Free Software Foundation, | |
17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. | |
18 * | |
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19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
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20 * or visit www.oracle.com if you need additional information or have any |
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21 * questions. |
342 | 22 * |
23 */ | |
24 | |
1972 | 25 #ifndef SHARE_VM_GC_IMPLEMENTATION_G1_G1COLLECTEDHEAP_HPP |
26 #define SHARE_VM_GC_IMPLEMENTATION_G1_G1COLLECTEDHEAP_HPP | |
27 | |
28 #include "gc_implementation/g1/concurrentMark.hpp" | |
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29 #include "gc_implementation/g1/g1AllocRegion.hpp" |
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30 #include "gc_implementation/g1/g1HRPrinter.hpp" |
1972 | 31 #include "gc_implementation/g1/g1RemSet.hpp" |
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32 #include "gc_implementation/g1/g1MonitoringSupport.hpp" |
3766 | 33 #include "gc_implementation/g1/heapRegionSeq.hpp" |
2152 | 34 #include "gc_implementation/g1/heapRegionSets.hpp" |
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35 #include "gc_implementation/shared/hSpaceCounters.hpp" |
6595 | 36 #include "gc_implementation/shared/parGCAllocBuffer.hpp" |
1972 | 37 #include "memory/barrierSet.hpp" |
38 #include "memory/memRegion.hpp" | |
39 #include "memory/sharedHeap.hpp" | |
40 | |
342 | 41 // A "G1CollectedHeap" is an implementation of a java heap for HotSpot. |
42 // It uses the "Garbage First" heap organization and algorithm, which | |
43 // may combine concurrent marking with parallel, incremental compaction of | |
44 // heap subsets that will yield large amounts of garbage. | |
45 | |
46 class HeapRegion; | |
2173 | 47 class HRRSCleanupTask; |
342 | 48 class GenerationSpec; |
49 class OopsInHeapRegionClosure; | |
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50 class G1KlassScanClosure; |
342 | 51 class G1ScanHeapEvacClosure; |
52 class ObjectClosure; | |
53 class SpaceClosure; | |
54 class CompactibleSpaceClosure; | |
55 class Space; | |
56 class G1CollectorPolicy; | |
57 class GenRemSet; | |
58 class G1RemSet; | |
59 class HeapRegionRemSetIterator; | |
60 class ConcurrentMark; | |
61 class ConcurrentMarkThread; | |
62 class ConcurrentG1Refine; | |
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63 class GenerationCounters; |
342 | 64 |
6197 | 65 typedef OverflowTaskQueue<StarTask, mtGC> RefToScanQueue; |
66 typedef GenericTaskQueueSet<RefToScanQueue, mtGC> RefToScanQueueSet; | |
342 | 67 |
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68 typedef int RegionIdx_t; // needs to hold [ 0..max_regions() ) |
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69 typedef int CardIdx_t; // needs to hold [ 0..CardsPerRegion ) |
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70 |
342 | 71 enum GCAllocPurpose { |
72 GCAllocForTenured, | |
73 GCAllocForSurvived, | |
74 GCAllocPurposeCount | |
75 }; | |
76 | |
6197 | 77 class YoungList : public CHeapObj<mtGC> { |
342 | 78 private: |
79 G1CollectedHeap* _g1h; | |
80 | |
81 HeapRegion* _head; | |
82 | |
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83 HeapRegion* _survivor_head; |
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84 HeapRegion* _survivor_tail; |
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85 |
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86 HeapRegion* _curr; |
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87 |
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88 uint _length; |
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89 uint _survivor_length; |
342 | 90 |
91 size_t _last_sampled_rs_lengths; | |
92 size_t _sampled_rs_lengths; | |
93 | |
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94 void empty_list(HeapRegion* list); |
342 | 95 |
96 public: | |
97 YoungList(G1CollectedHeap* g1h); | |
98 | |
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99 void push_region(HeapRegion* hr); |
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100 void add_survivor_region(HeapRegion* hr); |
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101 |
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102 void empty_list(); |
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103 bool is_empty() { return _length == 0; } |
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104 uint length() { return _length; } |
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105 uint survivor_length() { return _survivor_length; } |
342 | 106 |
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107 // Currently we do not keep track of the used byte sum for the |
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108 // young list and the survivors and it'd be quite a lot of work to |
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109 // do so. When we'll eventually replace the young list with |
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110 // instances of HeapRegionLinkedList we'll get that for free. So, |
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111 // we'll report the more accurate information then. |
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112 size_t eden_used_bytes() { |
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113 assert(length() >= survivor_length(), "invariant"); |
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114 return (size_t) (length() - survivor_length()) * HeapRegion::GrainBytes; |
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115 } |
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116 size_t survivor_used_bytes() { |
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117 return (size_t) survivor_length() * HeapRegion::GrainBytes; |
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118 } |
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119 |
342 | 120 void rs_length_sampling_init(); |
121 bool rs_length_sampling_more(); | |
122 void rs_length_sampling_next(); | |
123 | |
124 void reset_sampled_info() { | |
125 _last_sampled_rs_lengths = 0; | |
126 } | |
127 size_t sampled_rs_lengths() { return _last_sampled_rs_lengths; } | |
128 | |
129 // for development purposes | |
130 void reset_auxilary_lists(); | |
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131 void clear() { _head = NULL; _length = 0; } |
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132 |
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133 void clear_survivors() { |
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134 _survivor_head = NULL; |
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135 _survivor_tail = NULL; |
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136 _survivor_length = 0; |
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137 } |
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138 |
342 | 139 HeapRegion* first_region() { return _head; } |
140 HeapRegion* first_survivor_region() { return _survivor_head; } | |
545 | 141 HeapRegion* last_survivor_region() { return _survivor_tail; } |
342 | 142 |
143 // debugging | |
144 bool check_list_well_formed(); | |
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145 bool check_list_empty(bool check_sample = true); |
342 | 146 void print(); |
147 }; | |
148 | |
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149 class MutatorAllocRegion : public G1AllocRegion { |
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150 protected: |
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151 virtual HeapRegion* allocate_new_region(size_t word_size, bool force); |
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152 virtual void retire_region(HeapRegion* alloc_region, size_t allocated_bytes); |
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153 public: |
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154 MutatorAllocRegion() |
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155 : G1AllocRegion("Mutator Alloc Region", false /* bot_updates */) { } |
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156 }; |
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157 |
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158 // The G1 STW is alive closure. |
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159 // An instance is embedded into the G1CH and used as the |
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160 // (optional) _is_alive_non_header closure in the STW |
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161 // reference processor. It is also extensively used during |
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162 // refence processing during STW evacuation pauses. |
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163 class G1STWIsAliveClosure: public BoolObjectClosure { |
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164 G1CollectedHeap* _g1; |
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165 public: |
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166 G1STWIsAliveClosure(G1CollectedHeap* g1) : _g1(g1) {} |
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167 void do_object(oop p) { assert(false, "Do not call."); } |
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168 bool do_object_b(oop p); |
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169 }; |
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170 |
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171 class SurvivorGCAllocRegion : public G1AllocRegion { |
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172 protected: |
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173 virtual HeapRegion* allocate_new_region(size_t word_size, bool force); |
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174 virtual void retire_region(HeapRegion* alloc_region, size_t allocated_bytes); |
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175 public: |
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176 SurvivorGCAllocRegion() |
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177 : G1AllocRegion("Survivor GC Alloc Region", false /* bot_updates */) { } |
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178 }; |
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179 |
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180 class OldGCAllocRegion : public G1AllocRegion { |
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181 protected: |
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182 virtual HeapRegion* allocate_new_region(size_t word_size, bool force); |
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183 virtual void retire_region(HeapRegion* alloc_region, size_t allocated_bytes); |
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184 public: |
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185 OldGCAllocRegion() |
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186 : G1AllocRegion("Old GC Alloc Region", true /* bot_updates */) { } |
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187 }; |
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188 |
342 | 189 class RefineCardTableEntryClosure; |
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190 |
342 | 191 class G1CollectedHeap : public SharedHeap { |
192 friend class VM_G1CollectForAllocation; | |
193 friend class VM_G1CollectFull; | |
194 friend class VM_G1IncCollectionPause; | |
195 friend class VMStructs; | |
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196 friend class MutatorAllocRegion; |
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197 friend class SurvivorGCAllocRegion; |
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198 friend class OldGCAllocRegion; |
342 | 199 |
200 // Closures used in implementation. | |
5987 | 201 template <bool do_gen_barrier, G1Barrier barrier, bool do_mark_object> |
202 friend class G1ParCopyClosure; | |
342 | 203 friend class G1IsAliveClosure; |
204 friend class G1EvacuateFollowersClosure; | |
205 friend class G1ParScanThreadState; | |
206 friend class G1ParScanClosureSuper; | |
207 friend class G1ParEvacuateFollowersClosure; | |
208 friend class G1ParTask; | |
209 friend class G1FreeGarbageRegionClosure; | |
210 friend class RefineCardTableEntryClosure; | |
211 friend class G1PrepareCompactClosure; | |
212 friend class RegionSorter; | |
2152 | 213 friend class RegionResetter; |
342 | 214 friend class CountRCClosure; |
215 friend class EvacPopObjClosure; | |
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216 friend class G1ParCleanupCTTask; |
342 | 217 |
218 // Other related classes. | |
219 friend class G1MarkSweep; | |
220 | |
221 private: | |
222 // The one and only G1CollectedHeap, so static functions can find it. | |
223 static G1CollectedHeap* _g1h; | |
224 | |
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225 static size_t _humongous_object_threshold_in_words; |
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226 |
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227 // Storage for the G1 heap. |
342 | 228 VirtualSpace _g1_storage; |
229 MemRegion _g1_reserved; | |
230 | |
231 // The part of _g1_storage that is currently committed. | |
232 MemRegion _g1_committed; | |
233 | |
2152 | 234 // The master free list. It will satisfy all new region allocations. |
235 MasterFreeRegionList _free_list; | |
236 | |
237 // The secondary free list which contains regions that have been | |
238 // freed up during the cleanup process. This will be appended to the | |
239 // master free list when appropriate. | |
240 SecondaryFreeRegionList _secondary_free_list; | |
241 | |
4072 | 242 // It keeps track of the old regions. |
243 MasterOldRegionSet _old_set; | |
244 | |
2152 | 245 // It keeps track of the humongous regions. |
246 MasterHumongousRegionSet _humongous_set; | |
342 | 247 |
248 // The number of regions we could create by expansion. | |
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249 uint _expansion_regions; |
342 | 250 |
251 // The block offset table for the G1 heap. | |
252 G1BlockOffsetSharedArray* _bot_shared; | |
253 | |
4072 | 254 // Tears down the region sets / lists so that they are empty and the |
255 // regions on the heap do not belong to a region set / list. The | |
256 // only exception is the humongous set which we leave unaltered. If | |
257 // free_list_only is true, it will only tear down the master free | |
258 // list. It is called before a Full GC (free_list_only == false) or | |
259 // before heap shrinking (free_list_only == true). | |
260 void tear_down_region_sets(bool free_list_only); | |
261 | |
262 // Rebuilds the region sets / lists so that they are repopulated to | |
263 // reflect the contents of the heap. The only exception is the | |
264 // humongous set which was not torn down in the first place. If | |
265 // free_list_only is true, it will only rebuild the master free | |
266 // list. It is called after a Full GC (free_list_only == false) or | |
267 // after heap shrinking (free_list_only == true). | |
268 void rebuild_region_sets(bool free_list_only); | |
342 | 269 |
270 // The sequence of all heap regions in the heap. | |
3766 | 271 HeapRegionSeq _hrs; |
342 | 272 |
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273 // Alloc region used to satisfy mutator allocation requests. |
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274 MutatorAllocRegion _mutator_alloc_region; |
342 | 275 |
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276 // Alloc region used to satisfy allocation requests by the GC for |
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277 // survivor objects. |
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278 SurvivorGCAllocRegion _survivor_gc_alloc_region; |
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279 |
6595 | 280 // PLAB sizing policy for survivors. |
281 PLABStats _survivor_plab_stats; | |
282 | |
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283 // Alloc region used to satisfy allocation requests by the GC for |
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284 // old objects. |
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285 OldGCAllocRegion _old_gc_alloc_region; |
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286 |
6595 | 287 // PLAB sizing policy for tenured objects. |
288 PLABStats _old_plab_stats; | |
289 | |
290 PLABStats* stats_for_purpose(GCAllocPurpose purpose) { | |
291 PLABStats* stats = NULL; | |
292 | |
293 switch (purpose) { | |
294 case GCAllocForSurvived: | |
295 stats = &_survivor_plab_stats; | |
296 break; | |
297 case GCAllocForTenured: | |
298 stats = &_old_plab_stats; | |
299 break; | |
300 default: | |
301 assert(false, "unrecognized GCAllocPurpose"); | |
302 } | |
303 | |
304 return stats; | |
305 } | |
306 | |
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307 // The last old region we allocated to during the last GC. |
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308 // Typically, it is not full so we should re-use it during the next GC. |
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309 HeapRegion* _retained_old_gc_alloc_region; |
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310 |
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311 // It specifies whether we should attempt to expand the heap after a |
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312 // region allocation failure. If heap expansion fails we set this to |
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313 // false so that we don't re-attempt the heap expansion (it's likely |
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314 // that subsequent expansion attempts will also fail if one fails). |
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315 // Currently, it is only consulted during GC and it's reset at the |
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316 // start of each GC. |
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317 bool _expand_heap_after_alloc_failure; |
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318 |
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319 // It resets the mutator alloc region before new allocations can take place. |
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320 void init_mutator_alloc_region(); |
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321 |
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322 // It releases the mutator alloc region. |
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323 void release_mutator_alloc_region(); |
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324 |
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325 // It initializes the GC alloc regions at the start of a GC. |
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326 void init_gc_alloc_regions(); |
342 | 327 |
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328 // It releases the GC alloc regions at the end of a GC. |
6819 | 329 void release_gc_alloc_regions(uint no_of_gc_workers); |
342 | 330 |
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331 // It does any cleanup that needs to be done on the GC alloc regions |
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332 // before a Full GC. |
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333 void abandon_gc_alloc_regions(); |
342 | 334 |
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335 // Helper for monitoring and management support. |
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336 G1MonitoringSupport* _g1mm; |
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337 |
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338 // Determines PLAB size for a particular allocation purpose. |
6595 | 339 size_t desired_plab_sz(GCAllocPurpose purpose); |
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340 |
342 | 341 // Outside of GC pauses, the number of bytes used in all regions other |
342 // than the current allocation region. | |
343 size_t _summary_bytes_used; | |
344 | |
526 | 345 // This is used for a quick test on whether a reference points into |
346 // the collection set or not. Basically, we have an array, with one | |
347 // byte per region, and that byte denotes whether the corresponding | |
348 // region is in the collection set or not. The entry corresponding | |
349 // the bottom of the heap, i.e., region 0, is pointed to by | |
350 // _in_cset_fast_test_base. The _in_cset_fast_test field has been | |
351 // biased so that it actually points to address 0 of the address | |
352 // space, to make the test as fast as possible (we can simply shift | |
353 // the address to address into it, instead of having to subtract the | |
354 // bottom of the heap from the address before shifting it; basically | |
355 // it works in the same way the card table works). | |
356 bool* _in_cset_fast_test; | |
357 | |
358 // The allocated array used for the fast test on whether a reference | |
359 // points into the collection set or not. This field is also used to | |
360 // free the array. | |
361 bool* _in_cset_fast_test_base; | |
362 | |
363 // The length of the _in_cset_fast_test_base array. | |
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364 uint _in_cset_fast_test_length; |
526 | 365 |
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366 volatile unsigned _gc_time_stamp; |
342 | 367 |
368 size_t* _surviving_young_words; | |
369 | |
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370 G1HRPrinter _hr_printer; |
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371 |
342 | 372 void setup_surviving_young_words(); |
373 void update_surviving_young_words(size_t* surv_young_words); | |
374 void cleanup_surviving_young_words(); | |
375 | |
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376 // It decides whether an explicit GC should start a concurrent cycle |
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377 // instead of doing a STW GC. Currently, a concurrent cycle is |
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378 // explicitly started if: |
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379 // (a) cause == _gc_locker and +GCLockerInvokesConcurrent, or |
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380 // (b) cause == _java_lang_system_gc and +ExplicitGCInvokesConcurrent. |
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381 // (c) cause == _g1_humongous_allocation |
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382 bool should_do_concurrent_full_gc(GCCause::Cause cause); |
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383 |
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384 // Keeps track of how many "old marking cycles" (i.e., Full GCs or |
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385 // concurrent cycles) we have started. |
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386 volatile unsigned int _old_marking_cycles_started; |
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387 |
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388 // Keeps track of how many "old marking cycles" (i.e., Full GCs or |
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389 // concurrent cycles) we have completed. |
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390 volatile unsigned int _old_marking_cycles_completed; |
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391 |
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392 // This is a non-product method that is helpful for testing. It is |
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393 // called at the end of a GC and artificially expands the heap by |
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394 // allocating a number of dead regions. This way we can induce very |
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395 // frequent marking cycles and stress the cleanup / concurrent |
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396 // cleanup code more (as all the regions that will be allocated by |
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397 // this method will be found dead by the marking cycle). |
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398 void allocate_dummy_regions() PRODUCT_RETURN; |
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399 |
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400 // Clear RSets after a compaction. It also resets the GC time stamps. |
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401 void clear_rsets_post_compaction(); |
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402 |
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403 // If the HR printer is active, dump the state of the regions in the |
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404 // heap after a compaction. |
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405 void print_hrs_post_compaction(); |
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406 |
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407 double verify(bool guard, const char* msg); |
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408 void verify_before_gc(); |
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409 void verify_after_gc(); |
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410 |
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411 void log_gc_header(); |
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412 void log_gc_footer(double pause_time_sec); |
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413 |
1973 | 414 // These are macros so that, if the assert fires, we get the correct |
415 // line number, file, etc. | |
416 | |
2361 | 417 #define heap_locking_asserts_err_msg(_extra_message_) \ |
2152 | 418 err_msg("%s : Heap_lock locked: %s, at safepoint: %s, is VM thread: %s", \ |
2361 | 419 (_extra_message_), \ |
2152 | 420 BOOL_TO_STR(Heap_lock->owned_by_self()), \ |
421 BOOL_TO_STR(SafepointSynchronize::is_at_safepoint()), \ | |
422 BOOL_TO_STR(Thread::current()->is_VM_thread())) | |
1973 | 423 |
424 #define assert_heap_locked() \ | |
425 do { \ | |
426 assert(Heap_lock->owned_by_self(), \ | |
427 heap_locking_asserts_err_msg("should be holding the Heap_lock")); \ | |
428 } while (0) | |
429 | |
2361 | 430 #define assert_heap_locked_or_at_safepoint(_should_be_vm_thread_) \ |
1973 | 431 do { \ |
432 assert(Heap_lock->owned_by_self() || \ | |
2152 | 433 (SafepointSynchronize::is_at_safepoint() && \ |
2361 | 434 ((_should_be_vm_thread_) == Thread::current()->is_VM_thread())), \ |
1973 | 435 heap_locking_asserts_err_msg("should be holding the Heap_lock or " \ |
436 "should be at a safepoint")); \ | |
437 } while (0) | |
438 | |
439 #define assert_heap_locked_and_not_at_safepoint() \ | |
440 do { \ | |
441 assert(Heap_lock->owned_by_self() && \ | |
442 !SafepointSynchronize::is_at_safepoint(), \ | |
443 heap_locking_asserts_err_msg("should be holding the Heap_lock and " \ | |
444 "should not be at a safepoint")); \ | |
445 } while (0) | |
446 | |
447 #define assert_heap_not_locked() \ | |
448 do { \ | |
449 assert(!Heap_lock->owned_by_self(), \ | |
450 heap_locking_asserts_err_msg("should not be holding the Heap_lock")); \ | |
451 } while (0) | |
452 | |
453 #define assert_heap_not_locked_and_not_at_safepoint() \ | |
454 do { \ | |
455 assert(!Heap_lock->owned_by_self() && \ | |
456 !SafepointSynchronize::is_at_safepoint(), \ | |
457 heap_locking_asserts_err_msg("should not be holding the Heap_lock and " \ | |
458 "should not be at a safepoint")); \ | |
459 } while (0) | |
460 | |
2361 | 461 #define assert_at_safepoint(_should_be_vm_thread_) \ |
1973 | 462 do { \ |
2152 | 463 assert(SafepointSynchronize::is_at_safepoint() && \ |
2361 | 464 ((_should_be_vm_thread_) == Thread::current()->is_VM_thread()), \ |
1973 | 465 heap_locking_asserts_err_msg("should be at a safepoint")); \ |
466 } while (0) | |
467 | |
468 #define assert_not_at_safepoint() \ | |
469 do { \ | |
470 assert(!SafepointSynchronize::is_at_safepoint(), \ | |
471 heap_locking_asserts_err_msg("should not be at a safepoint")); \ | |
472 } while (0) | |
473 | |
342 | 474 protected: |
475 | |
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476 // The young region list. |
342 | 477 YoungList* _young_list; |
478 | |
479 // The current policy object for the collector. | |
480 G1CollectorPolicy* _g1_policy; | |
481 | |
2152 | 482 // This is the second level of trying to allocate a new region. If |
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483 // new_region() didn't find a region on the free_list, this call will |
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484 // check whether there's anything available on the |
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485 // secondary_free_list and/or wait for more regions to appear on |
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486 // that list, if _free_regions_coming is set. |
2361 | 487 HeapRegion* new_region_try_secondary_free_list(); |
342 | 488 |
2361 | 489 // Try to allocate a single non-humongous HeapRegion sufficient for |
490 // an allocation of the given word_size. If do_expand is true, | |
491 // attempt to expand the heap if necessary to satisfy the allocation | |
492 // request. | |
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493 HeapRegion* new_region(size_t word_size, bool do_expand); |
342 | 494 |
2361 | 495 // Attempt to satisfy a humongous allocation request of the given |
496 // size by finding a contiguous set of free regions of num_regions | |
497 // length and remove them from the master free list. Return the | |
3766 | 498 // index of the first region or G1_NULL_HRS_INDEX if the search |
499 // was unsuccessful. | |
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500 uint humongous_obj_allocate_find_first(uint num_regions, |
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501 size_t word_size); |
342 | 502 |
2361 | 503 // Initialize a contiguous set of free regions of length num_regions |
504 // and starting at index first so that they appear as a single | |
505 // humongous region. | |
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506 HeapWord* humongous_obj_allocate_initialize_regions(uint first, |
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507 uint num_regions, |
2361 | 508 size_t word_size); |
509 | |
510 // Attempt to allocate a humongous object of the given size. Return | |
511 // NULL if unsuccessful. | |
2152 | 512 HeapWord* humongous_obj_allocate(size_t word_size); |
1973 | 513 |
514 // The following two methods, allocate_new_tlab() and | |
515 // mem_allocate(), are the two main entry points from the runtime | |
516 // into the G1's allocation routines. They have the following | |
517 // assumptions: | |
518 // | |
519 // * They should both be called outside safepoints. | |
520 // | |
521 // * They should both be called without holding the Heap_lock. | |
522 // | |
523 // * All allocation requests for new TLABs should go to | |
524 // allocate_new_tlab(). | |
525 // | |
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526 // * All non-TLAB allocation requests should go to mem_allocate(). |
1973 | 527 // |
528 // * If either call cannot satisfy the allocation request using the | |
529 // current allocating region, they will try to get a new one. If | |
530 // this fails, they will attempt to do an evacuation pause and | |
531 // retry the allocation. | |
532 // | |
533 // * If all allocation attempts fail, even after trying to schedule | |
534 // an evacuation pause, allocate_new_tlab() will return NULL, | |
535 // whereas mem_allocate() will attempt a heap expansion and/or | |
536 // schedule a Full GC. | |
537 // | |
538 // * We do not allow humongous-sized TLABs. So, allocate_new_tlab | |
539 // should never be called with word_size being humongous. All | |
540 // humongous allocation requests should go to mem_allocate() which | |
541 // will satisfy them with a special path. | |
542 | |
543 virtual HeapWord* allocate_new_tlab(size_t word_size); | |
544 | |
545 virtual HeapWord* mem_allocate(size_t word_size, | |
546 bool* gc_overhead_limit_was_exceeded); | |
342 | 547 |
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548 // The following three methods take a gc_count_before_ret |
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549 // parameter which is used to return the GC count if the method |
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550 // returns NULL. Given that we are required to read the GC count |
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551 // while holding the Heap_lock, and these paths will take the |
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552 // Heap_lock at some point, it's easier to get them to read the GC |
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553 // count while holding the Heap_lock before they return NULL instead |
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554 // of the caller (namely: mem_allocate()) having to also take the |
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555 // Heap_lock just to read the GC count. |
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556 |
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557 // First-level mutator allocation attempt: try to allocate out of |
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558 // the mutator alloc region without taking the Heap_lock. This |
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559 // should only be used for non-humongous allocations. |
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560 inline HeapWord* attempt_allocation(size_t word_size, |
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561 unsigned int* gc_count_before_ret); |
342 | 562 |
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563 // Second-level mutator allocation attempt: take the Heap_lock and |
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564 // retry the allocation attempt, potentially scheduling a GC |
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565 // pause. This should only be used for non-humongous allocations. |
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566 HeapWord* attempt_allocation_slow(size_t word_size, |
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567 unsigned int* gc_count_before_ret); |
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568 |
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569 // Takes the Heap_lock and attempts a humongous allocation. It can |
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570 // potentially schedule a GC pause. |
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571 HeapWord* attempt_allocation_humongous(size_t word_size, |
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572 unsigned int* gc_count_before_ret); |
1973 | 573 |
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574 // Allocation attempt that should be called during safepoints (e.g., |
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575 // at the end of a successful GC). expect_null_mutator_alloc_region |
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576 // specifies whether the mutator alloc region is expected to be NULL |
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577 // or not. |
1973 | 578 HeapWord* attempt_allocation_at_safepoint(size_t word_size, |
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579 bool expect_null_mutator_alloc_region); |
1973 | 580 |
581 // It dirties the cards that cover the block so that so that the post | |
582 // write barrier never queues anything when updating objects on this | |
583 // block. It is assumed (and in fact we assert) that the block | |
584 // belongs to a young region. | |
585 inline void dirty_young_block(HeapWord* start, size_t word_size); | |
342 | 586 |
587 // Allocate blocks during garbage collection. Will ensure an | |
588 // allocation region, either by picking one or expanding the | |
589 // heap, and then allocate a block of the given size. The block | |
590 // may not be a humongous - it must fit into a single heap region. | |
591 HeapWord* par_allocate_during_gc(GCAllocPurpose purpose, size_t word_size); | |
592 | |
593 HeapWord* allocate_during_gc_slow(GCAllocPurpose purpose, | |
594 HeapRegion* alloc_region, | |
595 bool par, | |
596 size_t word_size); | |
597 | |
598 // Ensure that no further allocations can happen in "r", bearing in mind | |
599 // that parallel threads might be attempting allocations. | |
600 void par_allocate_remaining_space(HeapRegion* r); | |
601 | |
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602 // Allocation attempt during GC for a survivor object / PLAB. |
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603 inline HeapWord* survivor_attempt_allocation(size_t word_size); |
545 | 604 |
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605 // Allocation attempt during GC for an old object / PLAB. |
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606 inline HeapWord* old_attempt_allocation(size_t word_size); |
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607 |
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608 // These methods are the "callbacks" from the G1AllocRegion class. |
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609 |
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610 // For mutator alloc regions. |
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611 HeapRegion* new_mutator_alloc_region(size_t word_size, bool force); |
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612 void retire_mutator_alloc_region(HeapRegion* alloc_region, |
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613 size_t allocated_bytes); |
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614 |
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615 // For GC alloc regions. |
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616 HeapRegion* new_gc_alloc_region(size_t word_size, uint count, |
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617 GCAllocPurpose ap); |
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618 void retire_gc_alloc_region(HeapRegion* alloc_region, |
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619 size_t allocated_bytes, GCAllocPurpose ap); |
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620 |
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621 // - if explicit_gc is true, the GC is for a System.gc() or a heap |
1973 | 622 // inspection request and should collect the entire heap |
623 // - if clear_all_soft_refs is true, all soft references should be | |
624 // cleared during the GC | |
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625 // - if explicit_gc is false, word_size describes the allocation that |
1973 | 626 // the GC should attempt (at least) to satisfy |
627 // - it returns false if it is unable to do the collection due to the | |
628 // GC locker being active, true otherwise | |
629 bool do_collection(bool explicit_gc, | |
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630 bool clear_all_soft_refs, |
342 | 631 size_t word_size); |
632 | |
633 // Callback from VM_G1CollectFull operation. | |
634 // Perform a full collection. | |
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635 virtual void do_full_collection(bool clear_all_soft_refs); |
342 | 636 |
637 // Resize the heap if necessary after a full collection. If this is | |
638 // after a collect-for allocation, "word_size" is the allocation size, | |
639 // and will be considered part of the used portion of the heap. | |
640 void resize_if_necessary_after_full_collection(size_t word_size); | |
641 | |
642 // Callback from VM_G1CollectForAllocation operation. | |
643 // This function does everything necessary/possible to satisfy a | |
644 // failed allocation request (including collection, expansion, etc.) | |
1973 | 645 HeapWord* satisfy_failed_allocation(size_t word_size, bool* succeeded); |
342 | 646 |
647 // Attempting to expand the heap sufficiently | |
648 // to support an allocation of the given "word_size". If | |
649 // successful, perform the allocation and return the address of the | |
650 // allocated block, or else "NULL". | |
1973 | 651 HeapWord* expand_and_allocate(size_t word_size); |
342 | 652 |
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653 // Process any reference objects discovered during |
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654 // an incremental evacuation pause. |
6819 | 655 void process_discovered_references(uint no_of_gc_workers); |
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656 |
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657 // Enqueue any remaining discovered references |
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658 // after processing. |
6819 | 659 void enqueue_discovered_references(uint no_of_gc_workers); |
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660 |
342 | 661 public: |
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662 |
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663 G1MonitoringSupport* g1mm() { |
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664 assert(_g1mm != NULL, "should have been initialized"); |
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665 return _g1mm; |
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666 } |
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667 |
342 | 668 // Expand the garbage-first heap by at least the given size (in bytes!). |
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669 // Returns true if the heap was expanded by the requested amount; |
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670 // false otherwise. |
342 | 671 // (Rounds up to a HeapRegion boundary.) |
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672 bool expand(size_t expand_bytes); |
342 | 673 |
674 // Do anything common to GC's. | |
675 virtual void gc_prologue(bool full); | |
676 virtual void gc_epilogue(bool full); | |
677 | |
526 | 678 // We register a region with the fast "in collection set" test. We |
679 // simply set to true the array slot corresponding to this region. | |
680 void register_region_with_in_cset_fast_test(HeapRegion* r) { | |
681 assert(_in_cset_fast_test_base != NULL, "sanity"); | |
682 assert(r->in_collection_set(), "invariant"); | |
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683 uint index = r->hrs_index(); |
3766 | 684 assert(index < _in_cset_fast_test_length, "invariant"); |
526 | 685 assert(!_in_cset_fast_test_base[index], "invariant"); |
686 _in_cset_fast_test_base[index] = true; | |
687 } | |
688 | |
689 // This is a fast test on whether a reference points into the | |
690 // collection set or not. It does not assume that the reference | |
691 // points into the heap; if it doesn't, it will return false. | |
692 bool in_cset_fast_test(oop obj) { | |
693 assert(_in_cset_fast_test != NULL, "sanity"); | |
694 if (_g1_committed.contains((HeapWord*) obj)) { | |
695 // no need to subtract the bottom of the heap from obj, | |
696 // _in_cset_fast_test is biased | |
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697 uintx index = (uintx) obj >> HeapRegion::LogOfHRGrainBytes; |
526 | 698 bool ret = _in_cset_fast_test[index]; |
699 // let's make sure the result is consistent with what the slower | |
700 // test returns | |
701 assert( ret || !obj_in_cs(obj), "sanity"); | |
702 assert(!ret || obj_in_cs(obj), "sanity"); | |
703 return ret; | |
704 } else { | |
705 return false; | |
706 } | |
707 } | |
708 | |
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709 void clear_cset_fast_test() { |
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710 assert(_in_cset_fast_test_base != NULL, "sanity"); |
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711 memset(_in_cset_fast_test_base, false, |
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712 (size_t) _in_cset_fast_test_length * sizeof(bool)); |
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713 } |
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714 |
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715 // This is called at the start of either a concurrent cycle or a Full |
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716 // GC to update the number of old marking cycles started. |
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717 void increment_old_marking_cycles_started(); |
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718 |
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719 // This is called at the end of either a concurrent cycle or a Full |
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720 // GC to update the number of old marking cycles completed. Those two |
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721 // can happen in a nested fashion, i.e., we start a concurrent |
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722 // cycle, a Full GC happens half-way through it which ends first, |
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723 // and then the cycle notices that a Full GC happened and ends |
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724 // too. The concurrent parameter is a boolean to help us do a bit |
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725 // tighter consistency checking in the method. If concurrent is |
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726 // false, the caller is the inner caller in the nesting (i.e., the |
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727 // Full GC). If concurrent is true, the caller is the outer caller |
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728 // in this nesting (i.e., the concurrent cycle). Further nesting is |
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729 // not currently supported. The end of this call also notifies |
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730 // the FullGCCount_lock in case a Java thread is waiting for a full |
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731 // GC to happen (e.g., it called System.gc() with |
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732 // +ExplicitGCInvokesConcurrent). |
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733 void increment_old_marking_cycles_completed(bool concurrent); |
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734 |
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735 unsigned int old_marking_cycles_completed() { |
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736 return _old_marking_cycles_completed; |
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737 } |
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738 |
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739 G1HRPrinter* hr_printer() { return &_hr_printer; } |
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740 |
342 | 741 protected: |
742 | |
743 // Shrink the garbage-first heap by at most the given size (in bytes!). | |
744 // (Rounds down to a HeapRegion boundary.) | |
745 virtual void shrink(size_t expand_bytes); | |
746 void shrink_helper(size_t expand_bytes); | |
747 | |
1709 | 748 #if TASKQUEUE_STATS |
749 static void print_taskqueue_stats_hdr(outputStream* const st = gclog_or_tty); | |
750 void print_taskqueue_stats(outputStream* const st = gclog_or_tty) const; | |
751 void reset_taskqueue_stats(); | |
752 #endif // TASKQUEUE_STATS | |
753 | |
1973 | 754 // Schedule the VM operation that will do an evacuation pause to |
755 // satisfy an allocation request of word_size. *succeeded will | |
756 // return whether the VM operation was successful (it did do an | |
757 // evacuation pause) or not (another thread beat us to it or the GC | |
758 // locker was active). Given that we should not be holding the | |
759 // Heap_lock when we enter this method, we will pass the | |
760 // gc_count_before (i.e., total_collections()) as a parameter since | |
761 // it has to be read while holding the Heap_lock. Currently, both | |
762 // methods that call do_collection_pause() release the Heap_lock | |
763 // before the call, so it's easy to read gc_count_before just before. | |
764 HeapWord* do_collection_pause(size_t word_size, | |
765 unsigned int gc_count_before, | |
766 bool* succeeded); | |
342 | 767 |
768 // The guts of the incremental collection pause, executed by the vm | |
1973 | 769 // thread. It returns false if it is unable to do the collection due |
770 // to the GC locker being active, true otherwise | |
771 bool do_collection_pause_at_safepoint(double target_pause_time_ms); | |
342 | 772 |
773 // Actually do the work of evacuating the collection set. | |
1973 | 774 void evacuate_collection_set(); |
342 | 775 |
776 // The g1 remembered set of the heap. | |
777 G1RemSet* _g1_rem_set; | |
778 // And it's mod ref barrier set, used to track updates for the above. | |
779 ModRefBarrierSet* _mr_bs; | |
780 | |
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781 // A set of cards that cover the objects for which the Rsets should be updated |
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782 // concurrently after the collection. |
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783 DirtyCardQueueSet _dirty_card_queue_set; |
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784 |
342 | 785 // The Heap Region Rem Set Iterator. |
786 HeapRegionRemSetIterator** _rem_set_iterator; | |
787 | |
788 // The closure used to refine a single card. | |
789 RefineCardTableEntryClosure* _refine_cte_cl; | |
790 | |
791 // A function to check the consistency of dirty card logs. | |
792 void check_ct_logs_at_safepoint(); | |
793 | |
1705 | 794 // A DirtyCardQueueSet that is used to hold cards that contain |
795 // references into the current collection set. This is used to | |
796 // update the remembered sets of the regions in the collection | |
797 // set in the event of an evacuation failure. | |
798 DirtyCardQueueSet _into_cset_dirty_card_queue_set; | |
799 | |
342 | 800 // After a collection pause, make the regions in the CS into free |
801 // regions. | |
802 void free_collection_set(HeapRegion* cs_head); | |
803 | |
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804 // Abandon the current collection set without recording policy |
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805 // statistics or updating free lists. |
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806 void abandon_collection_set(HeapRegion* cs_head); |
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807 |
342 | 808 // Applies "scan_non_heap_roots" to roots outside the heap, |
809 // "scan_rs" to roots inside the heap (having done "set_region" to | |
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810 // indicate the region in which the root resides), |
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811 // and does "scan_metadata" If "scan_rs" is |
342 | 812 // NULL, then this step is skipped. The "worker_i" |
813 // param is for use with parallel roots processing, and should be | |
814 // the "i" of the calling parallel worker thread's work(i) function. | |
815 // In the sequential case this param will be ignored. | |
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816 void g1_process_strong_roots(bool is_scavenging, |
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817 ScanningOption so, |
342 | 818 OopClosure* scan_non_heap_roots, |
819 OopsInHeapRegionClosure* scan_rs, | |
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820 G1KlassScanClosure* scan_klasses, |
342 | 821 int worker_i); |
822 | |
823 // Apply "blk" to all the weak roots of the system. These include | |
824 // JNI weak roots, the code cache, system dictionary, symbol table, | |
825 // string table, and referents of reachable weak refs. | |
826 void g1_process_weak_roots(OopClosure* root_closure, | |
827 OopClosure* non_root_closure); | |
828 | |
2361 | 829 // Frees a non-humongous region by initializing its contents and |
2152 | 830 // adding it to the free list that's passed as a parameter (this is |
831 // usually a local list which will be appended to the master free | |
832 // list later). The used bytes of freed regions are accumulated in | |
833 // pre_used. If par is true, the region's RSet will not be freed | |
834 // up. The assumption is that this will be done later. | |
835 void free_region(HeapRegion* hr, | |
836 size_t* pre_used, | |
837 FreeRegionList* free_list, | |
838 bool par); | |
342 | 839 |
2361 | 840 // Frees a humongous region by collapsing it into individual regions |
841 // and calling free_region() for each of them. The freed regions | |
842 // will be added to the free list that's passed as a parameter (this | |
843 // is usually a local list which will be appended to the master free | |
844 // list later). The used bytes of freed regions are accumulated in | |
845 // pre_used. If par is true, the region's RSet will not be freed | |
846 // up. The assumption is that this will be done later. | |
2152 | 847 void free_humongous_region(HeapRegion* hr, |
848 size_t* pre_used, | |
849 FreeRegionList* free_list, | |
850 HumongousRegionSet* humongous_proxy_set, | |
851 bool par); | |
342 | 852 |
3766 | 853 // Notifies all the necessary spaces that the committed space has |
854 // been updated (either expanded or shrunk). It should be called | |
855 // after _g1_storage is updated. | |
856 void update_committed_space(HeapWord* old_end, HeapWord* new_end); | |
857 | |
342 | 858 // The concurrent marker (and the thread it runs in.) |
859 ConcurrentMark* _cm; | |
860 ConcurrentMarkThread* _cmThread; | |
861 bool _mark_in_progress; | |
862 | |
863 // The concurrent refiner. | |
864 ConcurrentG1Refine* _cg1r; | |
865 | |
866 // The parallel task queues | |
867 RefToScanQueueSet *_task_queues; | |
868 | |
869 // True iff a evacuation has failed in the current collection. | |
870 bool _evacuation_failed; | |
871 | |
872 // Set the attribute indicating whether evacuation has failed in the | |
873 // current collection. | |
874 void set_evacuation_failed(bool b) { _evacuation_failed = b; } | |
875 | |
876 // Failed evacuations cause some logical from-space objects to have | |
877 // forwarding pointers to themselves. Reset them. | |
878 void remove_self_forwarding_pointers(); | |
879 | |
880 // When one is non-null, so is the other. Together, they each pair is | |
881 // an object with a preserved mark, and its mark value. | |
882 GrowableArray<oop>* _objs_with_preserved_marks; | |
883 GrowableArray<markOop>* _preserved_marks_of_objs; | |
884 | |
885 // Preserve the mark of "obj", if necessary, in preparation for its mark | |
886 // word being overwritten with a self-forwarding-pointer. | |
887 void preserve_mark_if_necessary(oop obj, markOop m); | |
888 | |
889 // The stack of evac-failure objects left to be scanned. | |
890 GrowableArray<oop>* _evac_failure_scan_stack; | |
891 // The closure to apply to evac-failure objects. | |
892 | |
893 OopsInHeapRegionClosure* _evac_failure_closure; | |
894 // Set the field above. | |
895 void | |
896 set_evac_failure_closure(OopsInHeapRegionClosure* evac_failure_closure) { | |
897 _evac_failure_closure = evac_failure_closure; | |
898 } | |
899 | |
900 // Push "obj" on the scan stack. | |
901 void push_on_evac_failure_scan_stack(oop obj); | |
902 // Process scan stack entries until the stack is empty. | |
903 void drain_evac_failure_scan_stack(); | |
904 // True iff an invocation of "drain_scan_stack" is in progress; to | |
905 // prevent unnecessary recursion. | |
906 bool _drain_in_progress; | |
907 | |
908 // Do any necessary initialization for evacuation-failure handling. | |
909 // "cl" is the closure that will be used to process evac-failure | |
910 // objects. | |
911 void init_for_evac_failure(OopsInHeapRegionClosure* cl); | |
912 // Do any necessary cleanup for evacuation-failure handling data | |
913 // structures. | |
914 void finalize_for_evac_failure(); | |
915 | |
916 // An attempt to evacuate "obj" has failed; take necessary steps. | |
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917 oop handle_evacuation_failure_par(OopsInHeapRegionClosure* cl, oop obj); |
342 | 918 void handle_evacuation_failure_common(oop obj, markOop m); |
919 | |
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920 #ifndef PRODUCT |
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921 // Support for forcing evacuation failures. Analogous to |
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922 // PromotionFailureALot for the other collectors. |
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923 |
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924 // Records whether G1EvacuationFailureALot should be in effect |
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925 // for the current GC |
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926 bool _evacuation_failure_alot_for_current_gc; |
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927 |
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928 // Used to record the GC number for interval checking when |
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929 // determining whether G1EvaucationFailureALot is in effect |
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930 // for the current GC. |
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931 size_t _evacuation_failure_alot_gc_number; |
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932 |
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933 // Count of the number of evacuations between failures. |
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934 volatile size_t _evacuation_failure_alot_count; |
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935 |
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936 // Set whether G1EvacuationFailureALot should be in effect |
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937 // for the current GC (based upon the type of GC and which |
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938 // command line flags are set); |
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939 inline bool evacuation_failure_alot_for_gc_type(bool gcs_are_young, |
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940 bool during_initial_mark, |
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941 bool during_marking); |
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942 |
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943 inline void set_evacuation_failure_alot_for_current_gc(); |
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944 |
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945 // Return true if it's time to cause an evacuation failure. |
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946 inline bool evacuation_should_fail(); |
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947 |
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948 // Reset the G1EvacuationFailureALot counters. Should be called at |
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949 // the end of an evacuation pause in which an evacuation failure ocurred. |
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950 inline void reset_evacuation_should_fail(); |
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951 #endif // !PRODUCT |
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952 |
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953 // ("Weak") Reference processing support. |
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954 // |
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955 // G1 has 2 instances of the referece processor class. One |
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956 // (_ref_processor_cm) handles reference object discovery |
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957 // and subsequent processing during concurrent marking cycles. |
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958 // |
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959 // The other (_ref_processor_stw) handles reference object |
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960 // discovery and processing during full GCs and incremental |
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961 // evacuation pauses. |
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962 // |
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963 // During an incremental pause, reference discovery will be |
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964 // temporarily disabled for _ref_processor_cm and will be |
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965 // enabled for _ref_processor_stw. At the end of the evacuation |
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966 // pause references discovered by _ref_processor_stw will be |
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967 // processed and discovery will be disabled. The previous |
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968 // setting for reference object discovery for _ref_processor_cm |
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969 // will be re-instated. |
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970 // |
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971 // At the start of marking: |
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972 // * Discovery by the CM ref processor is verified to be inactive |
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973 // and it's discovered lists are empty. |
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974 // * Discovery by the CM ref processor is then enabled. |
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975 // |
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976 // At the end of marking: |
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977 // * Any references on the CM ref processor's discovered |
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978 // lists are processed (possibly MT). |
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979 // |
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980 // At the start of full GC we: |
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981 // * Disable discovery by the CM ref processor and |
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982 // empty CM ref processor's discovered lists |
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983 // (without processing any entries). |
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984 // * Verify that the STW ref processor is inactive and it's |
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985 // discovered lists are empty. |
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986 // * Temporarily set STW ref processor discovery as single threaded. |
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987 // * Temporarily clear the STW ref processor's _is_alive_non_header |
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988 // field. |
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989 // * Finally enable discovery by the STW ref processor. |
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990 // |
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991 // The STW ref processor is used to record any discovered |
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992 // references during the full GC. |
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993 // |
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994 // At the end of a full GC we: |
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995 // * Enqueue any reference objects discovered by the STW ref processor |
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996 // that have non-live referents. This has the side-effect of |
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997 // making the STW ref processor inactive by disabling discovery. |
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998 // * Verify that the CM ref processor is still inactive |
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999 // and no references have been placed on it's discovered |
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1000 // lists (also checked as a precondition during initial marking). |
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1001 |
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1002 // The (stw) reference processor... |
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1003 ReferenceProcessor* _ref_processor_stw; |
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1004 |
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1005 // During reference object discovery, the _is_alive_non_header |
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1006 // closure (if non-null) is applied to the referent object to |
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1007 // determine whether the referent is live. If so then the |
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1008 // reference object does not need to be 'discovered' and can |
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1009 // be treated as a regular oop. This has the benefit of reducing |
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1010 // the number of 'discovered' reference objects that need to |
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1011 // be processed. |
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1012 // |
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1013 // Instance of the is_alive closure for embedding into the |
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1014 // STW reference processor as the _is_alive_non_header field. |
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1015 // Supplying a value for the _is_alive_non_header field is |
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1016 // optional but doing so prevents unnecessary additions to |
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1017 // the discovered lists during reference discovery. |
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1018 G1STWIsAliveClosure _is_alive_closure_stw; |
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1019 |
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1020 // The (concurrent marking) reference processor... |
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1021 ReferenceProcessor* _ref_processor_cm; |
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1022 |
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1023 // Instance of the concurrent mark is_alive closure for embedding |
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1024 // into the Concurrent Marking reference processor as the |
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1025 // _is_alive_non_header field. Supplying a value for the |
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1026 // _is_alive_non_header field is optional but doing so prevents |
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1027 // unnecessary additions to the discovered lists during reference |
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1028 // discovery. |
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1029 G1CMIsAliveClosure _is_alive_closure_cm; |
342 | 1030 |
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1031 // Cache used by G1CollectedHeap::start_cset_region_for_worker(). |
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1032 HeapRegion** _worker_cset_start_region; |
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1033 |
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1034 // Time stamp to validate the regions recorded in the cache |
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1035 // used by G1CollectedHeap::start_cset_region_for_worker(). |
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1036 // The heap region entry for a given worker is valid iff |
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1037 // the associated time stamp value matches the current value |
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1038 // of G1CollectedHeap::_gc_time_stamp. |
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1039 unsigned int* _worker_cset_start_region_time_stamp; |
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1040 |
342 | 1041 enum G1H_process_strong_roots_tasks { |
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1042 G1H_PS_filter_satb_buffers, |
342 | 1043 G1H_PS_refProcessor_oops_do, |
1044 // Leave this one last. | |
1045 G1H_PS_NumElements | |
1046 }; | |
1047 | |
1048 SubTasksDone* _process_strong_tasks; | |
1049 | |
2152 | 1050 volatile bool _free_regions_coming; |
342 | 1051 |
1052 public: | |
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1053 |
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1054 SubTasksDone* process_strong_tasks() { return _process_strong_tasks; } |
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1055 |
342 | 1056 void set_refine_cte_cl_concurrency(bool concurrent); |
1057 | |
1709 | 1058 RefToScanQueue *task_queue(int i) const; |
342 | 1059 |
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1060 // A set of cards where updates happened during the GC |
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1061 DirtyCardQueueSet& dirty_card_queue_set() { return _dirty_card_queue_set; } |
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1062 |
1705 | 1063 // A DirtyCardQueueSet that is used to hold cards that contain |
1064 // references into the current collection set. This is used to | |
1065 // update the remembered sets of the regions in the collection | |
1066 // set in the event of an evacuation failure. | |
1067 DirtyCardQueueSet& into_cset_dirty_card_queue_set() | |
1068 { return _into_cset_dirty_card_queue_set; } | |
1069 | |
342 | 1070 // Create a G1CollectedHeap with the specified policy. |
1071 // Must call the initialize method afterwards. | |
1072 // May not return if something goes wrong. | |
1073 G1CollectedHeap(G1CollectorPolicy* policy); | |
1074 | |
1075 // Initialize the G1CollectedHeap to have the initial and | |
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1076 // maximum sizes and remembered and barrier sets |
342 | 1077 // specified by the policy object. |
1078 jint initialize(); | |
1079 | |
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1080 // Initialize weak reference processing. |
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1081 virtual void ref_processing_init(); |
342 | 1082 |
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1083 void set_par_threads(uint t) { |
342 | 1084 SharedHeap::set_par_threads(t); |
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1085 // Done in SharedHeap but oddly there are |
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1086 // two _process_strong_tasks's in a G1CollectedHeap |
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1087 // so do it here too. |
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1088 _process_strong_tasks->set_n_threads(t); |
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1089 } |
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1090 |
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1091 // Set _n_par_threads according to a policy TBD. |
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1092 void set_par_threads(); |
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1093 |
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1094 void set_n_termination(int t) { |
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1095 _process_strong_tasks->set_n_threads(t); |
342 | 1096 } |
1097 | |
1098 virtual CollectedHeap::Name kind() const { | |
1099 return CollectedHeap::G1CollectedHeap; | |
1100 } | |
1101 | |
1102 // The current policy object for the collector. | |
1103 G1CollectorPolicy* g1_policy() const { return _g1_policy; } | |
1104 | |
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1105 virtual CollectorPolicy* collector_policy() const { return (CollectorPolicy*) g1_policy(); } |
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1106 |
342 | 1107 // Adaptive size policy. No such thing for g1. |
1108 virtual AdaptiveSizePolicy* size_policy() { return NULL; } | |
1109 | |
1110 // The rem set and barrier set. | |
1111 G1RemSet* g1_rem_set() const { return _g1_rem_set; } | |
1112 ModRefBarrierSet* mr_bs() const { return _mr_bs; } | |
1113 | |
1114 // The rem set iterator. | |
1115 HeapRegionRemSetIterator* rem_set_iterator(int i) { | |
1116 return _rem_set_iterator[i]; | |
1117 } | |
1118 | |
1119 HeapRegionRemSetIterator* rem_set_iterator() { | |
1120 return _rem_set_iterator[0]; | |
1121 } | |
1122 | |
1123 unsigned get_gc_time_stamp() { | |
1124 return _gc_time_stamp; | |
1125 } | |
1126 | |
1127 void reset_gc_time_stamp() { | |
1128 _gc_time_stamp = 0; | |
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1129 OrderAccess::fence(); |
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1130 // Clear the cached CSet starting regions and time stamps. |
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1131 // Their validity is dependent on the GC timestamp. |
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1132 clear_cset_start_regions(); |
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1133 } |
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1134 |
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1135 void check_gc_time_stamps() PRODUCT_RETURN; |
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1136 |
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1137 void increment_gc_time_stamp() { |
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1138 ++_gc_time_stamp; |
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1139 OrderAccess::fence(); |
342 | 1140 } |
1141 | |
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1142 // Reset the given region's GC timestamp. If it's starts humongous, |
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1143 // also reset the GC timestamp of its corresponding |
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1144 // continues humongous regions too. |
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1145 void reset_gc_time_stamps(HeapRegion* hr); |
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1146 |
1705 | 1147 void iterate_dirty_card_closure(CardTableEntryClosure* cl, |
1148 DirtyCardQueue* into_cset_dcq, | |
1149 bool concurrent, int worker_i); | |
342 | 1150 |
1151 // The shared block offset table array. | |
1152 G1BlockOffsetSharedArray* bot_shared() const { return _bot_shared; } | |
1153 | |
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1154 // Reference Processing accessors |
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1155 |
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1156 // The STW reference processor.... |
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1157 ReferenceProcessor* ref_processor_stw() const { return _ref_processor_stw; } |
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1158 |
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1159 // The Concurent Marking reference processor... |
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1160 ReferenceProcessor* ref_processor_cm() const { return _ref_processor_cm; } |
342 | 1161 |
1162 virtual size_t capacity() const; | |
1163 virtual size_t used() const; | |
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1164 // This should be called when we're not holding the heap lock. The |
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1165 // result might be a bit inaccurate. |
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1166 size_t used_unlocked() const; |
342 | 1167 size_t recalculate_used() const; |
1168 | |
1169 // These virtual functions do the actual allocation. | |
1170 // Some heaps may offer a contiguous region for shared non-blocking | |
1171 // allocation, via inlined code (by exporting the address of the top and | |
1172 // end fields defining the extent of the contiguous allocation region.) | |
1173 // But G1CollectedHeap doesn't yet support this. | |
1174 | |
1175 // Return an estimate of the maximum allocation that could be performed | |
1176 // without triggering any collection or expansion activity. In a | |
1177 // generational collector, for example, this is probably the largest | |
1178 // allocation that could be supported (without expansion) in the youngest | |
1179 // generation. It is "unsafe" because no locks are taken; the result | |
1180 // should be treated as an approximation, not a guarantee, for use in | |
1181 // heuristic resizing decisions. | |
1182 virtual size_t unsafe_max_alloc(); | |
1183 | |
1184 virtual bool is_maximal_no_gc() const { | |
1185 return _g1_storage.uncommitted_size() == 0; | |
1186 } | |
1187 | |
1188 // The total number of regions in the heap. | |
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1189 uint n_regions() { return _hrs.length(); } |
3766 | 1190 |
1191 // The max number of regions in the heap. | |
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1192 uint max_regions() { return _hrs.max_length(); } |
342 | 1193 |
1194 // The number of regions that are completely free. | |
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1195 uint free_regions() { return _free_list.length(); } |
342 | 1196 |
1197 // The number of regions that are not completely free. | |
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1198 uint used_regions() { return n_regions() - free_regions(); } |
342 | 1199 |
1200 // The number of regions available for "regular" expansion. | |
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1201 uint expansion_regions() { return _expansion_regions; } |
342 | 1202 |
3766 | 1203 // Factory method for HeapRegion instances. It will return NULL if |
1204 // the allocation fails. | |
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1205 HeapRegion* new_heap_region(uint hrs_index, HeapWord* bottom); |
3766 | 1206 |
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1207 void verify_not_dirty_region(HeapRegion* hr) PRODUCT_RETURN; |
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1208 void verify_dirty_region(HeapRegion* hr) PRODUCT_RETURN; |
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1209 void verify_dirty_young_list(HeapRegion* head) PRODUCT_RETURN; |
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1210 void verify_dirty_young_regions() PRODUCT_RETURN; |
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1211 |
2152 | 1212 // verify_region_sets() performs verification over the region |
1213 // lists. It will be compiled in the product code to be used when | |
1214 // necessary (i.e., during heap verification). | |
1215 void verify_region_sets(); | |
342 | 1216 |
2152 | 1217 // verify_region_sets_optional() is planted in the code for |
1218 // list verification in non-product builds (and it can be enabled in | |
1219 // product builds by definning HEAP_REGION_SET_FORCE_VERIFY to be 1). | |
1220 #if HEAP_REGION_SET_FORCE_VERIFY | |
1221 void verify_region_sets_optional() { | |
1222 verify_region_sets(); | |
1223 } | |
1224 #else // HEAP_REGION_SET_FORCE_VERIFY | |
1225 void verify_region_sets_optional() { } | |
1226 #endif // HEAP_REGION_SET_FORCE_VERIFY | |
342 | 1227 |
2152 | 1228 #ifdef ASSERT |
2361 | 1229 bool is_on_master_free_list(HeapRegion* hr) { |
2152 | 1230 return hr->containing_set() == &_free_list; |
1231 } | |
342 | 1232 |
2361 | 1233 bool is_in_humongous_set(HeapRegion* hr) { |
2152 | 1234 return hr->containing_set() == &_humongous_set; |
2361 | 1235 } |
2152 | 1236 #endif // ASSERT |
342 | 1237 |
2152 | 1238 // Wrapper for the region list operations that can be called from |
1239 // methods outside this class. | |
342 | 1240 |
2152 | 1241 void secondary_free_list_add_as_tail(FreeRegionList* list) { |
1242 _secondary_free_list.add_as_tail(list); | |
1243 } | |
342 | 1244 |
2152 | 1245 void append_secondary_free_list() { |
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1246 _free_list.add_as_head(&_secondary_free_list); |
2152 | 1247 } |
342 | 1248 |
2361 | 1249 void append_secondary_free_list_if_not_empty_with_lock() { |
1250 // If the secondary free list looks empty there's no reason to | |
1251 // take the lock and then try to append it. | |
2152 | 1252 if (!_secondary_free_list.is_empty()) { |
1253 MutexLockerEx x(SecondaryFreeList_lock, Mutex::_no_safepoint_check_flag); | |
1254 append_secondary_free_list(); | |
1255 } | |
1256 } | |
342 | 1257 |
4072 | 1258 void old_set_remove(HeapRegion* hr) { |
1259 _old_set.remove(hr); | |
1260 } | |
1261 | |
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1262 size_t non_young_capacity_bytes() { |
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1263 return _old_set.total_capacity_bytes() + _humongous_set.total_capacity_bytes(); |
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1264 } |
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1265 |
2152 | 1266 void set_free_regions_coming(); |
1267 void reset_free_regions_coming(); | |
1268 bool free_regions_coming() { return _free_regions_coming; } | |
1269 void wait_while_free_regions_coming(); | |
342 | 1270 |
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1271 // Determine whether the given region is one that we are using as an |
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1272 // old GC alloc region. |
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1273 bool is_old_gc_alloc_region(HeapRegion* hr) { |
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1274 return hr == _retained_old_gc_alloc_region; |
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1275 } |
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1276 |
342 | 1277 // Perform a collection of the heap; intended for use in implementing |
1278 // "System.gc". This probably implies as full a collection as the | |
1279 // "CollectedHeap" supports. | |
1280 virtual void collect(GCCause::Cause cause); | |
1281 | |
1282 // The same as above but assume that the caller holds the Heap_lock. | |
1283 void collect_locked(GCCause::Cause cause); | |
1284 | |
1285 // True iff a evacuation has failed in the most-recent collection. | |
1286 bool evacuation_failed() { return _evacuation_failed; } | |
1287 | |
2152 | 1288 // It will free a region if it has allocated objects in it that are |
1289 // all dead. It calls either free_region() or | |
1290 // free_humongous_region() depending on the type of the region that | |
1291 // is passed to it. | |
2173 | 1292 void free_region_if_empty(HeapRegion* hr, |
1293 size_t* pre_used, | |
1294 FreeRegionList* free_list, | |
4072 | 1295 OldRegionSet* old_proxy_set, |
2173 | 1296 HumongousRegionSet* humongous_proxy_set, |
1297 HRRSCleanupTask* hrrs_cleanup_task, | |
1298 bool par); | |
342 | 1299 |
2152 | 1300 // It appends the free list to the master free list and updates the |
1301 // master humongous list according to the contents of the proxy | |
1302 // list. It also adjusts the total used bytes according to pre_used | |
1303 // (if par is true, it will do so by taking the ParGCRareEvent_lock). | |
1304 void update_sets_after_freeing_regions(size_t pre_used, | |
1305 FreeRegionList* free_list, | |
4072 | 1306 OldRegionSet* old_proxy_set, |
2152 | 1307 HumongousRegionSet* humongous_proxy_set, |
1308 bool par); | |
342 | 1309 |
4708 | 1310 // Returns "TRUE" iff "p" points into the committed areas of the heap. |
342 | 1311 virtual bool is_in(const void* p) const; |
1312 | |
1313 // Return "TRUE" iff the given object address is within the collection | |
1314 // set. | |
1315 inline bool obj_in_cs(oop obj); | |
1316 | |
1317 // Return "TRUE" iff the given object address is in the reserved | |
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1318 // region of g1. |
342 | 1319 bool is_in_g1_reserved(const void* p) const { |
1320 return _g1_reserved.contains(p); | |
1321 } | |
1322 | |
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1323 // Returns a MemRegion that corresponds to the space that has been |
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1324 // reserved for the heap |
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1325 MemRegion g1_reserved() { |
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1326 return _g1_reserved; |
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1327 } |
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1328 |
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1329 // Returns a MemRegion that corresponds to the space that has been |
342 | 1330 // committed in the heap |
1331 MemRegion g1_committed() { | |
1332 return _g1_committed; | |
1333 } | |
1334 | |
2311 | 1335 virtual bool is_in_closed_subset(const void* p) const; |
342 | 1336 |
1337 // This resets the card table to all zeros. It is used after | |
1338 // a collection pause which used the card table to claim cards. | |
1339 void cleanUpCardTable(); | |
1340 | |
1341 // Iteration functions. | |
1342 | |
1343 // Iterate over all the ref-containing fields of all objects, calling | |
1344 // "cl.do_oop" on each. | |
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1345 virtual void oop_iterate(ExtendedOopClosure* cl); |
342 | 1346 |
1347 // Same as above, restricted to a memory region. | |
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1348 void oop_iterate(MemRegion mr, ExtendedOopClosure* cl); |
342 | 1349 |
1350 // Iterate over all objects, calling "cl.do_object" on each. | |
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1351 virtual void object_iterate(ObjectClosure* cl); |
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1352 |
678 | 1353 virtual void safe_object_iterate(ObjectClosure* cl) { |
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1354 object_iterate(cl); |
678 | 1355 } |
342 | 1356 |
1357 // Iterate over all objects allocated since the last collection, calling | |
1358 // "cl.do_object" on each. The heap must have been initialized properly | |
1359 // to support this function, or else this call will fail. | |
1360 virtual void object_iterate_since_last_GC(ObjectClosure* cl); | |
1361 | |
1362 // Iterate over all spaces in use in the heap, in ascending address order. | |
1363 virtual void space_iterate(SpaceClosure* cl); | |
1364 | |
1365 // Iterate over heap regions, in address order, terminating the | |
1366 // iteration early if the "doHeapRegion" method returns "true". | |
3766 | 1367 void heap_region_iterate(HeapRegionClosure* blk) const; |
342 | 1368 |
3766 | 1369 // Return the region with the given index. It assumes the index is valid. |
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1370 HeapRegion* region_at(uint index) const { return _hrs.at(index); } |
342 | 1371 |
1372 // Divide the heap region sequence into "chunks" of some size (the number | |
1373 // of regions divided by the number of parallel threads times some | |
1374 // overpartition factor, currently 4). Assumes that this will be called | |
1375 // in parallel by ParallelGCThreads worker threads with discinct worker | |
1376 // ids in the range [0..max(ParallelGCThreads-1, 1)], that all parallel | |
1377 // calls will use the same "claim_value", and that that claim value is | |
1378 // different from the claim_value of any heap region before the start of | |
1379 // the iteration. Applies "blk->doHeapRegion" to each of the regions, by | |
1380 // attempting to claim the first region in each chunk, and, if | |
1381 // successful, applying the closure to each region in the chunk (and | |
1382 // setting the claim value of the second and subsequent regions of the | |
1383 // chunk.) For now requires that "doHeapRegion" always returns "false", | |
1384 // i.e., that a closure never attempt to abort a traversal. | |
1385 void heap_region_par_iterate_chunked(HeapRegionClosure* blk, | |
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1386 uint worker, |
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1387 uint no_of_par_workers, |
342 | 1388 jint claim_value); |
1389 | |
390 | 1390 // It resets all the region claim values to the default. |
1391 void reset_heap_region_claim_values(); | |
1392 | |
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1393 // Resets the claim values of regions in the current |
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1394 // collection set to the default. |
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1395 void reset_cset_heap_region_claim_values(); |
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1396 |
355 | 1397 #ifdef ASSERT |
1398 bool check_heap_region_claim_values(jint claim_value); | |
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1399 |
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1400 // Same as the routine above but only checks regions in the |
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1401 // current collection set. |
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1402 bool check_cset_heap_region_claim_values(jint claim_value); |
355 | 1403 #endif // ASSERT |
1404 | |
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1405 // Clear the cached cset start regions and (more importantly) |
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1406 // the time stamps. Called when we reset the GC time stamp. |
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1407 void clear_cset_start_regions(); |
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1408 |
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1409 // Given the id of a worker, obtain or calculate a suitable |
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1410 // starting region for iterating over the current collection set. |
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1411 HeapRegion* start_cset_region_for_worker(int worker_i); |
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1412 |
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1413 // This is a convenience method that is used by the |
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1414 // HeapRegionIterator classes to calculate the starting region for |
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1415 // each worker so that they do not all start from the same region. |
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1416 HeapRegion* start_region_for_worker(uint worker_i, uint no_of_par_workers); |
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1417 |
342 | 1418 // Iterate over the regions (if any) in the current collection set. |
1419 void collection_set_iterate(HeapRegionClosure* blk); | |
1420 | |
1421 // As above but starting from region r | |
1422 void collection_set_iterate_from(HeapRegion* r, HeapRegionClosure *blk); | |
1423 | |
1424 // Returns the first (lowest address) compactible space in the heap. | |
1425 virtual CompactibleSpace* first_compactible_space(); | |
1426 | |
1427 // A CollectedHeap will contain some number of spaces. This finds the | |
1428 // space containing a given address, or else returns NULL. | |
1429 virtual Space* space_containing(const void* addr) const; | |
1430 | |
1431 // A G1CollectedHeap will contain some number of heap regions. This | |
1432 // finds the region containing a given address, or else returns NULL. | |
3766 | 1433 template <class T> |
1434 inline HeapRegion* heap_region_containing(const T addr) const; | |
342 | 1435 |
1436 // Like the above, but requires "addr" to be in the heap (to avoid a | |
1437 // null-check), and unlike the above, may return an continuing humongous | |
1438 // region. | |
3766 | 1439 template <class T> |
1440 inline HeapRegion* heap_region_containing_raw(const T addr) const; | |
342 | 1441 |
1442 // A CollectedHeap is divided into a dense sequence of "blocks"; that is, | |
1443 // each address in the (reserved) heap is a member of exactly | |
1444 // one block. The defining characteristic of a block is that it is | |
1445 // possible to find its size, and thus to progress forward to the next | |
1446 // block. (Blocks may be of different sizes.) Thus, blocks may | |
1447 // represent Java objects, or they might be free blocks in a | |
1448 // free-list-based heap (or subheap), as long as the two kinds are | |
1449 // distinguishable and the size of each is determinable. | |
1450 | |
1451 // Returns the address of the start of the "block" that contains the | |
1452 // address "addr". We say "blocks" instead of "object" since some heaps | |
1453 // may not pack objects densely; a chunk may either be an object or a | |
1454 // non-object. | |
1455 virtual HeapWord* block_start(const void* addr) const; | |
1456 | |
1457 // Requires "addr" to be the start of a chunk, and returns its size. | |
1458 // "addr + size" is required to be the start of a new chunk, or the end | |
1459 // of the active area of the heap. | |
1460 virtual size_t block_size(const HeapWord* addr) const; | |
1461 | |
1462 // Requires "addr" to be the start of a block, and returns "TRUE" iff | |
1463 // the block is an object. | |
1464 virtual bool block_is_obj(const HeapWord* addr) const; | |
1465 | |
1466 // Does this heap support heap inspection? (+PrintClassHistogram) | |
1467 virtual bool supports_heap_inspection() const { return true; } | |
1468 | |
1469 // Section on thread-local allocation buffers (TLABs) | |
1470 // See CollectedHeap for semantics. | |
1471 | |
1472 virtual bool supports_tlab_allocation() const; | |
1473 virtual size_t tlab_capacity(Thread* thr) const; | |
1474 virtual size_t unsafe_max_tlab_alloc(Thread* thr) const; | |
1475 | |
1476 // Can a compiler initialize a new object without store barriers? | |
1477 // This permission only extends from the creation of a new object | |
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1478 // via a TLAB up to the first subsequent safepoint. If such permission |
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1479 // is granted for this heap type, the compiler promises to call |
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1480 // defer_store_barrier() below on any slow path allocation of |
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1481 // a new object for which such initializing store barriers will |
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1482 // have been elided. G1, like CMS, allows this, but should be |
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1483 // ready to provide a compensating write barrier as necessary |
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1484 // if that storage came out of a non-young region. The efficiency |
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1485 // of this implementation depends crucially on being able to |
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1486 // answer very efficiently in constant time whether a piece of |
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1487 // storage in the heap comes from a young region or not. |
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1488 // See ReduceInitialCardMarks. |
342 | 1489 virtual bool can_elide_tlab_store_barriers() const { |
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1490 return true; |
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1491 } |
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1492 |
1166 | 1493 virtual bool card_mark_must_follow_store() const { |
1494 return true; | |
1495 } | |
1496 | |
3766 | 1497 bool is_in_young(const oop obj) { |
1027
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1498 HeapRegion* hr = heap_region_containing(obj); |
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1499 return hr != NULL && hr->is_young(); |
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1500 } |
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1501 |
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1502 #ifdef ASSERT |
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1503 virtual bool is_in_partial_collection(const void* p); |
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1504 #endif |
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1505 |
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1506 virtual bool is_scavengable(const void* addr); |
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1507 |
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1508 // We don't need barriers for initializing stores to objects |
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1509 // in the young gen: for the SATB pre-barrier, there is no |
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1510 // pre-value that needs to be remembered; for the remembered-set |
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1511 // update logging post-barrier, we don't maintain remembered set |
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1512 // information for young gen objects. |
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1513 virtual bool can_elide_initializing_store_barrier(oop new_obj) { |
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1514 return is_in_young(new_obj); |
342 | 1515 } |
1516 | |
1517 // Returns "true" iff the given word_size is "very large". | |
1518 static bool isHumongous(size_t word_size) { | |
1313
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1519 // Note this has to be strictly greater-than as the TLABs |
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1520 // are capped at the humongous thresold and we want to |
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1521 // ensure that we don't try to allocate a TLAB as |
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1522 // humongous and that we don't allocate a humongous |
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1523 // object in a TLAB. |
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1524 return word_size > _humongous_object_threshold_in_words; |
342 | 1525 } |
1526 | |
1527 // Update mod union table with the set of dirty cards. | |
1528 void updateModUnion(); | |
1529 | |
1530 // Set the mod union bits corresponding to the given memRegion. Note | |
1531 // that this is always a safe operation, since it doesn't clear any | |
1532 // bits. | |
1533 void markModUnionRange(MemRegion mr); | |
1534 | |
1535 // Records the fact that a marking phase is no longer in progress. | |
1536 void set_marking_complete() { | |
1537 _mark_in_progress = false; | |
1538 } | |
1539 void set_marking_started() { | |
1540 _mark_in_progress = true; | |
1541 } | |
1542 bool mark_in_progress() { | |
1543 return _mark_in_progress; | |
1544 } | |
1545 | |
1546 // Print the maximum heap capacity. | |
1547 virtual size_t max_capacity() const; | |
1548 | |
1549 virtual jlong millis_since_last_gc(); | |
1550 | |
1551 // Perform any cleanup actions necessary before allowing a verification. | |
1552 virtual void prepare_for_verify(); | |
1553 | |
1554 // Perform verification. | |
811 | 1555 |
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1556 // vo == UsePrevMarking -> use "prev" marking information, |
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1557 // vo == UseNextMarking -> use "next" marking information |
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1558 // vo == UseMarkWord -> use the mark word in the object header |
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1559 // |
811 | 1560 // NOTE: Only the "prev" marking information is guaranteed to be |
1561 // consistent most of the time, so most calls to this should use | |
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1562 // vo == UsePrevMarking. |
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1563 // Currently, there is only one case where this is called with |
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1564 // vo == UseNextMarking, which is to verify the "next" marking |
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1565 // information at the end of remark. |
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1566 // Currently there is only one place where this is called with |
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1567 // vo == UseMarkWord, which is to verify the marking during a |
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1568 // full GC. |
6008 | 1569 void verify(bool silent, VerifyOption vo); |
811 | 1570 |
1571 // Override; it uses the "prev" marking information | |
6008 | 1572 virtual void verify(bool silent); |
342 | 1573 virtual void print_on(outputStream* st) const; |
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1574 virtual void print_extended_on(outputStream* st) const; |
342 | 1575 |
1576 virtual void print_gc_threads_on(outputStream* st) const; | |
1577 virtual void gc_threads_do(ThreadClosure* tc) const; | |
1578 | |
1579 // Override | |
1580 void print_tracing_info() const; | |
1581 | |
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1582 // The following two methods are helpful for debugging RSet issues. |
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1583 void print_cset_rsets() PRODUCT_RETURN; |
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1584 void print_all_rsets() PRODUCT_RETURN; |
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1585 |
342 | 1586 // Convenience function to be used in situations where the heap type can be |
1587 // asserted to be this type. | |
1588 static G1CollectedHeap* heap(); | |
1589 | |
1590 void set_region_short_lived_locked(HeapRegion* hr); | |
1591 // add appropriate methods for any other surv rate groups | |
1592 | |
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1593 YoungList* young_list() { return _young_list; } |
342 | 1594 |
1595 // debugging | |
1596 bool check_young_list_well_formed() { | |
1597 return _young_list->check_list_well_formed(); | |
1598 } | |
1394
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1599 |
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1600 bool check_young_list_empty(bool check_heap, |
342 | 1601 bool check_sample = true); |
1602 | |
1603 // *** Stuff related to concurrent marking. It's not clear to me that so | |
1604 // many of these need to be public. | |
1605 | |
1606 // The functions below are helper functions that a subclass of | |
1607 // "CollectedHeap" can use in the implementation of its virtual | |
1608 // functions. | |
1609 // This performs a concurrent marking of the live objects in a | |
1610 // bitmap off to the side. | |
1611 void doConcurrentMark(); | |
1612 | |
1613 bool isMarkedPrev(oop obj) const; | |
1614 bool isMarkedNext(oop obj) const; | |
1615 | |
1616 // Determine if an object is dead, given the object and also | |
1617 // the region to which the object belongs. An object is dead | |
1618 // iff a) it was not allocated since the last mark and b) it | |
1619 // is not marked. | |
1620 | |
1621 bool is_obj_dead(const oop obj, const HeapRegion* hr) const { | |
1622 return | |
1623 !hr->obj_allocated_since_prev_marking(obj) && | |
1624 !isMarkedPrev(obj); | |
1625 } | |
1626 | |
1627 // This function returns true when an object has been | |
1628 // around since the previous marking and hasn't yet | |
1629 // been marked during this marking. | |
1630 | |
1631 bool is_obj_ill(const oop obj, const HeapRegion* hr) const { | |
1632 return | |
1633 !hr->obj_allocated_since_next_marking(obj) && | |
1634 !isMarkedNext(obj); | |
1635 } | |
1636 | |
1637 // Determine if an object is dead, given only the object itself. | |
1638 // This will find the region to which the object belongs and | |
1639 // then call the region version of the same function. | |
1640 | |
1641 // Added if it is NULL it isn't dead. | |
1642 | |
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1643 bool is_obj_dead(const oop obj) const { |
811 | 1644 const HeapRegion* hr = heap_region_containing(obj); |
342 | 1645 if (hr == NULL) { |
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1646 if (obj == NULL) return false; |
342 | 1647 else return true; |
1648 } | |
1649 else return is_obj_dead(obj, hr); | |
1650 } | |
1651 | |
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1652 bool is_obj_ill(const oop obj) const { |
811 | 1653 const HeapRegion* hr = heap_region_containing(obj); |
342 | 1654 if (hr == NULL) { |
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1655 if (obj == NULL) return false; |
342 | 1656 else return true; |
1657 } | |
1658 else return is_obj_ill(obj, hr); | |
1659 } | |
1660 | |
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1661 // The methods below are here for convenience and dispatch the |
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1662 // appropriate method depending on value of the given VerifyOption |
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1663 // parameter. The options for that parameter are: |
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1664 // |
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1665 // vo == UsePrevMarking -> use "prev" marking information, |
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1666 // vo == UseNextMarking -> use "next" marking information, |
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1667 // vo == UseMarkWord -> use mark word from object header |
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1668 |
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1669 bool is_obj_dead_cond(const oop obj, |
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1670 const HeapRegion* hr, |
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1671 const VerifyOption vo) const { |
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1672 switch (vo) { |
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1673 case VerifyOption_G1UsePrevMarking: return is_obj_dead(obj, hr); |
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1674 case VerifyOption_G1UseNextMarking: return is_obj_ill(obj, hr); |
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1675 case VerifyOption_G1UseMarkWord: return !obj->is_gc_marked(); |
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1676 default: ShouldNotReachHere(); |
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1677 } |
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1678 return false; // keep some compilers happy |
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1679 } |
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1680 |
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1681 bool is_obj_dead_cond(const oop obj, |
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1682 const VerifyOption vo) const { |
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1683 switch (vo) { |
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1684 case VerifyOption_G1UsePrevMarking: return is_obj_dead(obj); |
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1685 case VerifyOption_G1UseNextMarking: return is_obj_ill(obj); |
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1686 case VerifyOption_G1UseMarkWord: return !obj->is_gc_marked(); |
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1687 default: ShouldNotReachHere(); |
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1688 } |
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1689 return false; // keep some compilers happy |
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1690 } |
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1691 |
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1692 bool allocated_since_marking(oop obj, HeapRegion* hr, VerifyOption vo); |
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1693 HeapWord* top_at_mark_start(HeapRegion* hr, VerifyOption vo); |
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1694 bool is_marked(oop obj, VerifyOption vo); |
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1695 const char* top_at_mark_start_str(VerifyOption vo); |
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1696 |
342 | 1697 // The following is just to alert the verification code |
1698 // that a full collection has occurred and that the | |
1699 // remembered sets are no longer up to date. | |
1700 bool _full_collection; | |
1701 void set_full_collection() { _full_collection = true;} | |
1702 void clear_full_collection() {_full_collection = false;} | |
1703 bool full_collection() {return _full_collection;} | |
1704 | |
1705 ConcurrentMark* concurrent_mark() const { return _cm; } | |
1706 ConcurrentG1Refine* concurrent_g1_refine() const { return _cg1r; } | |
1707 | |
796
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1708 // The dirty cards region list is used to record a subset of regions |
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1709 // whose cards need clearing. The list if populated during the |
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1710 // remembered set scanning and drained during the card table |
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1711 // cleanup. Although the methods are reentrant, population/draining |
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1712 // phases must not overlap. For synchronization purposes the last |
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1713 // element on the list points to itself. |
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1714 HeapRegion* _dirty_cards_region_list; |
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1715 void push_dirty_cards_region(HeapRegion* hr); |
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1716 HeapRegion* pop_dirty_cards_region(); |
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1717 |
342 | 1718 public: |
1719 void stop_conc_gc_threads(); | |
1720 | |
1721 size_t pending_card_num(); | |
1722 size_t cards_scanned(); | |
1723 | |
1724 protected: | |
1725 size_t _max_heap_capacity; | |
1726 }; | |
1727 | |
845
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1728 class G1ParGCAllocBuffer: public ParGCAllocBuffer { |
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1729 private: |
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1730 bool _retired; |
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1731 |
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1732 public: |
3886
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1733 G1ParGCAllocBuffer(size_t gclab_word_size); |
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1734 |
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1735 void set_buf(HeapWord* buf) { |
845
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1736 ParGCAllocBuffer::set_buf(buf); |
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1737 _retired = false; |
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1738 } |
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1739 |
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1740 void retire(bool end_of_gc, bool retain) { |
845
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1741 if (_retired) |
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1742 return; |
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1743 ParGCAllocBuffer::retire(end_of_gc, retain); |
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1744 _retired = true; |
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1745 } |
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1746 }; |
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1747 |
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1748 class G1ParScanThreadState : public StackObj { |
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1749 protected: |
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1750 G1CollectedHeap* _g1h; |
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1751 RefToScanQueue* _refs; |
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1752 DirtyCardQueue _dcq; |
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1753 CardTableModRefBS* _ct_bs; |
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1754 G1RemSet* _g1_rem; |
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1755 |
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1756 G1ParGCAllocBuffer _surviving_alloc_buffer; |
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1757 G1ParGCAllocBuffer _tenured_alloc_buffer; |
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1758 G1ParGCAllocBuffer* _alloc_buffers[GCAllocPurposeCount]; |
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1759 ageTable _age_table; |
845
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1760 |
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1761 size_t _alloc_buffer_waste; |
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1762 size_t _undo_waste; |
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1763 |
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1764 OopsInHeapRegionClosure* _evac_failure_cl; |
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1765 G1ParScanHeapEvacClosure* _evac_cl; |
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1766 G1ParScanPartialArrayClosure* _partial_scan_cl; |
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1767 |
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1768 int _hash_seed; |
4836
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1769 uint _queue_num; |
845
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1770 |
1611 | 1771 size_t _term_attempts; |
845
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1772 |
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1773 double _start; |
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1774 double _start_strong_roots; |
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1775 double _strong_roots_time; |
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1776 double _start_term; |
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1777 double _term_time; |
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1778 |
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1779 // Map from young-age-index (0 == not young, 1 is youngest) to |
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1780 // surviving words. base is what we get back from the malloc call |
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1781 size_t* _surviving_young_words_base; |
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1782 // this points into the array, as we use the first few entries for padding |
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1783 size_t* _surviving_young_words; |
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1784 |
1709 | 1785 #define PADDING_ELEM_NUM (DEFAULT_CACHE_LINE_SIZE / sizeof(size_t)) |
845
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1786 |
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1787 void add_to_alloc_buffer_waste(size_t waste) { _alloc_buffer_waste += waste; } |
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1788 |
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1789 void add_to_undo_waste(size_t waste) { _undo_waste += waste; } |
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1790 |
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1791 DirtyCardQueue& dirty_card_queue() { return _dcq; } |
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1792 CardTableModRefBS* ctbs() { return _ct_bs; } |
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1793 |
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1794 template <class T> void immediate_rs_update(HeapRegion* from, T* p, int tid) { |
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1795 if (!from->is_survivor()) { |
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1796 _g1_rem->par_write_ref(from, p, tid); |
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1797 } |
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1798 } |
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1799 |
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1800 template <class T> void deferred_rs_update(HeapRegion* from, T* p, int tid) { |
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1801 // If the new value of the field points to the same region or |
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1802 // is the to-space, we don't need to include it in the Rset updates. |
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1803 if (!from->is_in_reserved(oopDesc::load_decode_heap_oop(p)) && !from->is_survivor()) { |
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1804 size_t card_index = ctbs()->index_for(p); |
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1805 // If the card hasn't been added to the buffer, do it. |
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1806 if (ctbs()->mark_card_deferred(card_index)) { |
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1807 dirty_card_queue().enqueue((jbyte*)ctbs()->byte_for_index(card_index)); |
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1808 } |
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1809 } |
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1810 } |
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1811 |
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1812 public: |
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1813 G1ParScanThreadState(G1CollectedHeap* g1h, uint queue_num); |
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1814 |
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1815 ~G1ParScanThreadState() { |
6197 | 1816 FREE_C_HEAP_ARRAY(size_t, _surviving_young_words_base, mtGC); |
845
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1817 } |
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1818 |
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1819 RefToScanQueue* refs() { return _refs; } |
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1820 ageTable* age_table() { return &_age_table; } |
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1821 |
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1822 G1ParGCAllocBuffer* alloc_buffer(GCAllocPurpose purpose) { |
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1823 return _alloc_buffers[purpose]; |
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1824 } |
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1825 |
1709 | 1826 size_t alloc_buffer_waste() const { return _alloc_buffer_waste; } |
1827 size_t undo_waste() const { return _undo_waste; } | |
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1828 |
1862
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1829 #ifdef ASSERT |
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1830 bool verify_ref(narrowOop* ref) const; |
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1831 bool verify_ref(oop* ref) const; |
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1832 bool verify_task(StarTask ref) const; |
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1833 #endif // ASSERT |
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1834 |
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1835 template <class T> void push_on_queue(T* ref) { |
1862
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1836 assert(verify_ref(ref), "sanity"); |
1709 | 1837 refs()->push(ref); |
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1838 } |
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1839 |
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1840 template <class T> void update_rs(HeapRegion* from, T* p, int tid) { |
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1841 if (G1DeferredRSUpdate) { |
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1842 deferred_rs_update(from, p, tid); |
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1843 } else { |
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1844 immediate_rs_update(from, p, tid); |
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1845 } |
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1846 } |
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1847 |
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1848 HeapWord* allocate_slow(GCAllocPurpose purpose, size_t word_sz) { |
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1849 HeapWord* obj = NULL; |
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1850 size_t gclab_word_size = _g1h->desired_plab_sz(purpose); |
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1851 if (word_sz * 100 < gclab_word_size * ParallelGCBufferWastePct) { |
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1852 G1ParGCAllocBuffer* alloc_buf = alloc_buffer(purpose); |
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1853 add_to_alloc_buffer_waste(alloc_buf->words_remaining()); |
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1854 alloc_buf->retire(false /* end_of_gc */, false /* retain */); |
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1855 |
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1856 HeapWord* buf = _g1h->par_allocate_during_gc(purpose, gclab_word_size); |
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1857 if (buf == NULL) return NULL; // Let caller handle allocation failure. |
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1858 // Otherwise. |
6595 | 1859 alloc_buf->set_word_size(gclab_word_size); |
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1860 alloc_buf->set_buf(buf); |
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1861 |
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1862 obj = alloc_buf->allocate(word_sz); |
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1863 assert(obj != NULL, "buffer was definitely big enough..."); |
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1864 } else { |
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1865 obj = _g1h->par_allocate_during_gc(purpose, word_sz); |
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1866 } |
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1867 return obj; |
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1868 } |
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1869 |
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1870 HeapWord* allocate(GCAllocPurpose purpose, size_t word_sz) { |
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1871 HeapWord* obj = alloc_buffer(purpose)->allocate(word_sz); |
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1872 if (obj != NULL) return obj; |
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1873 return allocate_slow(purpose, word_sz); |
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1874 } |
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1875 |
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1876 void undo_allocation(GCAllocPurpose purpose, HeapWord* obj, size_t word_sz) { |
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1877 if (alloc_buffer(purpose)->contains(obj)) { |
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1878 assert(alloc_buffer(purpose)->contains(obj + word_sz - 1), |
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1879 "should contain whole object"); |
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1880 alloc_buffer(purpose)->undo_allocation(obj, word_sz); |
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1881 } else { |
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1882 CollectedHeap::fill_with_object(obj, word_sz); |
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1883 add_to_undo_waste(word_sz); |
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1884 } |
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1885 } |
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1886 |
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1887 void set_evac_failure_closure(OopsInHeapRegionClosure* evac_failure_cl) { |
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1888 _evac_failure_cl = evac_failure_cl; |
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1889 } |
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1890 OopsInHeapRegionClosure* evac_failure_closure() { |
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1891 return _evac_failure_cl; |
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1892 } |
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1893 |
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1894 void set_evac_closure(G1ParScanHeapEvacClosure* evac_cl) { |
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1895 _evac_cl = evac_cl; |
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1896 } |
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1897 |
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1898 void set_partial_scan_closure(G1ParScanPartialArrayClosure* partial_scan_cl) { |
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1899 _partial_scan_cl = partial_scan_cl; |
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1900 } |
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1901 |
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1902 int* hash_seed() { return &_hash_seed; } |
4836
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1903 uint queue_num() { return _queue_num; } |
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1904 |
1709 | 1905 size_t term_attempts() const { return _term_attempts; } |
1611 | 1906 void note_term_attempt() { _term_attempts++; } |
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1907 |
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1908 void start_strong_roots() { |
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1909 _start_strong_roots = os::elapsedTime(); |
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1910 } |
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1911 void end_strong_roots() { |
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1912 _strong_roots_time += (os::elapsedTime() - _start_strong_roots); |
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1913 } |
1709 | 1914 double strong_roots_time() const { return _strong_roots_time; } |
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1915 |
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1916 void start_term_time() { |
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1917 note_term_attempt(); |
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1918 _start_term = os::elapsedTime(); |
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1919 } |
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1920 void end_term_time() { |
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1921 _term_time += (os::elapsedTime() - _start_term); |
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1922 } |
1709 | 1923 double term_time() const { return _term_time; } |
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1924 |
1709 | 1925 double elapsed_time() const { |
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1926 return os::elapsedTime() - _start; |
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1927 } |
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1928 |
1709 | 1929 static void |
1930 print_termination_stats_hdr(outputStream* const st = gclog_or_tty); | |
1931 void | |
1932 print_termination_stats(int i, outputStream* const st = gclog_or_tty) const; | |
1933 | |
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1934 size_t* surviving_young_words() { |
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1935 // We add on to hide entry 0 which accumulates surviving words for |
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1936 // age -1 regions (i.e. non-young ones) |
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1937 return _surviving_young_words; |
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1938 } |
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1939 |
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1940 void retire_alloc_buffers() { |
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1941 for (int ap = 0; ap < GCAllocPurposeCount; ++ap) { |
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1942 size_t waste = _alloc_buffers[ap]->words_remaining(); |
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1943 add_to_alloc_buffer_waste(waste); |
6595 | 1944 _alloc_buffers[ap]->flush_stats_and_retire(_g1h->stats_for_purpose((GCAllocPurpose)ap), |
1945 true /* end_of_gc */, | |
1946 false /* retain */); | |
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1947 } |
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1948 } |
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1949 |
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1950 template <class T> void deal_with_reference(T* ref_to_scan) { |
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1951 if (has_partial_array_mask(ref_to_scan)) { |
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1952 _partial_scan_cl->do_oop_nv(ref_to_scan); |
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1953 } else { |
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1954 // Note: we can use "raw" versions of "region_containing" because |
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1955 // "obj_to_scan" is definitely in the heap, and is not in a |
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1956 // humongous region. |
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1957 HeapRegion* r = _g1h->heap_region_containing_raw(ref_to_scan); |
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1958 _evac_cl->set_region(r); |
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1959 _evac_cl->do_oop_nv(ref_to_scan); |
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1960 } |
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1961 } |
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1962 |
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1963 void deal_with_reference(StarTask ref) { |
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1964 assert(verify_task(ref), "sanity"); |
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1965 if (ref.is_narrow()) { |
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1966 deal_with_reference((narrowOop*)ref); |
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1967 } else { |
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1968 deal_with_reference((oop*)ref); |
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1969 } |
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1970 } |
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1971 |
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1972 public: |
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1973 void trim_queue(); |
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1974 }; |
1972 | 1975 |
1976 #endif // SHARE_VM_GC_IMPLEMENTATION_G1_G1COLLECTEDHEAP_HPP |