Mercurial > hg > graal-jvmci-8
annotate src/share/vm/gc_implementation/g1/g1CollectedHeap.hpp @ 23660:b5f3a471e646
Merge.
author | Doug Simon <doug.simon@oracle.com> |
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date | Wed, 01 Jun 2016 00:11:44 +0200 |
parents | dd9cc155639c |
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rev | line source |
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20494 | 1 /* |
22936 | 2 * Copyright (c) 2001, 2015, 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 | |
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28 #include "gc_implementation/g1/g1AllocationContext.hpp" |
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29 #include "gc_implementation/g1/g1Allocator.hpp" |
1972 | 30 #include "gc_implementation/g1/concurrentMark.hpp" |
10405 | 31 #include "gc_implementation/g1/evacuationInfo.hpp" |
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32 #include "gc_implementation/g1/g1AllocRegion.hpp" |
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33 #include "gc_implementation/g1/g1BiasedArray.hpp" |
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34 #include "gc_implementation/g1/g1HRPrinter.hpp" |
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35 #include "gc_implementation/g1/g1InCSetState.hpp" |
10405 | 36 #include "gc_implementation/g1/g1MonitoringSupport.hpp" |
12343 | 37 #include "gc_implementation/g1/g1SATBCardTableModRefBS.hpp" |
10405 | 38 #include "gc_implementation/g1/g1YCTypes.hpp" |
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39 #include "gc_implementation/g1/heapRegionManager.hpp" |
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40 #include "gc_implementation/g1/heapRegionSet.hpp" |
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41 #include "gc_implementation/shared/hSpaceCounters.hpp" |
6595 | 42 #include "gc_implementation/shared/parGCAllocBuffer.hpp" |
1972 | 43 #include "memory/barrierSet.hpp" |
44 #include "memory/memRegion.hpp" | |
45 #include "memory/sharedHeap.hpp" | |
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46 #include "utilities/stack.hpp" |
1972 | 47 |
342 | 48 // A "G1CollectedHeap" is an implementation of a java heap for HotSpot. |
49 // It uses the "Garbage First" heap organization and algorithm, which | |
50 // may combine concurrent marking with parallel, incremental compaction of | |
51 // heap subsets that will yield large amounts of garbage. | |
52 | |
12080 | 53 // Forward declarations |
342 | 54 class HeapRegion; |
2173 | 55 class HRRSCleanupTask; |
342 | 56 class GenerationSpec; |
57 class OopsInHeapRegionClosure; | |
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58 class G1KlassScanClosure; |
342 | 59 class G1ScanHeapEvacClosure; |
60 class ObjectClosure; | |
61 class SpaceClosure; | |
62 class CompactibleSpaceClosure; | |
63 class Space; | |
64 class G1CollectorPolicy; | |
65 class GenRemSet; | |
66 class G1RemSet; | |
67 class HeapRegionRemSetIterator; | |
68 class ConcurrentMark; | |
69 class ConcurrentMarkThread; | |
70 class ConcurrentG1Refine; | |
10405 | 71 class ConcurrentGCTimer; |
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72 class GenerationCounters; |
10405 | 73 class STWGCTimer; |
74 class G1NewTracer; | |
75 class G1OldTracer; | |
76 class EvacuationFailedInfo; | |
12080 | 77 class nmethod; |
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78 class Ticks; |
342 | 79 |
6197 | 80 typedef OverflowTaskQueue<StarTask, mtGC> RefToScanQueue; |
81 typedef GenericTaskQueueSet<RefToScanQueue, mtGC> RefToScanQueueSet; | |
342 | 82 |
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83 typedef int RegionIdx_t; // needs to hold [ 0..max_regions() ) |
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84 typedef int CardIdx_t; // needs to hold [ 0..CardsPerRegion ) |
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85 |
6197 | 86 class YoungList : public CHeapObj<mtGC> { |
342 | 87 private: |
88 G1CollectedHeap* _g1h; | |
89 | |
90 HeapRegion* _head; | |
91 | |
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92 HeapRegion* _survivor_head; |
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93 HeapRegion* _survivor_tail; |
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94 |
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95 HeapRegion* _curr; |
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96 |
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97 uint _length; |
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98 uint _survivor_length; |
342 | 99 |
100 size_t _last_sampled_rs_lengths; | |
101 size_t _sampled_rs_lengths; | |
102 | |
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103 void empty_list(HeapRegion* list); |
342 | 104 |
105 public: | |
106 YoungList(G1CollectedHeap* g1h); | |
107 | |
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108 void push_region(HeapRegion* hr); |
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109 void add_survivor_region(HeapRegion* hr); |
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110 |
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111 void empty_list(); |
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112 bool is_empty() { return _length == 0; } |
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113 uint length() { return _length; } |
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114 uint survivor_length() { return _survivor_length; } |
342 | 115 |
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116 // Currently we do not keep track of the used byte sum for the |
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117 // young list and the survivors and it'd be quite a lot of work to |
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118 // do so. When we'll eventually replace the young list with |
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119 // instances of HeapRegionLinkedList we'll get that for free. So, |
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120 // we'll report the more accurate information then. |
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121 size_t eden_used_bytes() { |
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122 assert(length() >= survivor_length(), "invariant"); |
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123 return (size_t) (length() - survivor_length()) * HeapRegion::GrainBytes; |
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124 } |
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125 size_t survivor_used_bytes() { |
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126 return (size_t) survivor_length() * HeapRegion::GrainBytes; |
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127 } |
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128 |
342 | 129 void rs_length_sampling_init(); |
130 bool rs_length_sampling_more(); | |
131 void rs_length_sampling_next(); | |
132 | |
133 void reset_sampled_info() { | |
134 _last_sampled_rs_lengths = 0; | |
135 } | |
136 size_t sampled_rs_lengths() { return _last_sampled_rs_lengths; } | |
137 | |
138 // for development purposes | |
139 void reset_auxilary_lists(); | |
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140 void clear() { _head = NULL; _length = 0; } |
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141 |
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142 void clear_survivors() { |
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143 _survivor_head = NULL; |
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144 _survivor_tail = NULL; |
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145 _survivor_length = 0; |
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146 } |
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147 |
342 | 148 HeapRegion* first_region() { return _head; } |
149 HeapRegion* first_survivor_region() { return _survivor_head; } | |
545 | 150 HeapRegion* last_survivor_region() { return _survivor_tail; } |
342 | 151 |
152 // debugging | |
153 bool check_list_well_formed(); | |
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154 bool check_list_empty(bool check_sample = true); |
342 | 155 void print(); |
156 }; | |
157 | |
12080 | 158 // The G1 STW is alive closure. |
159 // An instance is embedded into the G1CH and used as the | |
160 // (optional) _is_alive_non_header closure in the STW | |
161 // reference processor. It is also extensively used during | |
162 // reference processing during STW evacuation pauses. | |
163 class G1STWIsAliveClosure: public BoolObjectClosure { | |
164 G1CollectedHeap* _g1; | |
165 public: | |
166 G1STWIsAliveClosure(G1CollectedHeap* g1) : _g1(g1) {} | |
167 bool do_object_b(oop p); | |
168 }; | |
169 | |
342 | 170 class RefineCardTableEntryClosure; |
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171 |
20337 | 172 class G1RegionMappingChangedListener : public G1MappingChangedListener { |
173 private: | |
174 void reset_from_card_cache(uint start_idx, size_t num_regions); | |
175 public: | |
20543 | 176 virtual void on_commit(uint start_idx, size_t num_regions, bool zero_filled); |
20337 | 177 }; |
178 | |
342 | 179 class G1CollectedHeap : public SharedHeap { |
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180 friend class VM_CollectForMetadataAllocation; |
342 | 181 friend class VM_G1CollectForAllocation; |
182 friend class VM_G1CollectFull; | |
183 friend class VM_G1IncCollectionPause; | |
184 friend class VMStructs; | |
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185 friend class MutatorAllocRegion; |
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186 friend class SurvivorGCAllocRegion; |
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187 friend class OldGCAllocRegion; |
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188 friend class G1Allocator; |
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189 friend class G1DefaultAllocator; |
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190 friend class G1ResManAllocator; |
342 | 191 |
192 // Closures used in implementation. | |
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193 template <G1Barrier barrier, G1Mark do_mark_object> |
5987 | 194 friend class G1ParCopyClosure; |
342 | 195 friend class G1IsAliveClosure; |
196 friend class G1EvacuateFollowersClosure; | |
197 friend class G1ParScanThreadState; | |
198 friend class G1ParScanClosureSuper; | |
199 friend class G1ParEvacuateFollowersClosure; | |
200 friend class G1ParTask; | |
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201 friend class G1ParGCAllocator; |
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202 friend class G1DefaultParGCAllocator; |
342 | 203 friend class G1FreeGarbageRegionClosure; |
204 friend class RefineCardTableEntryClosure; | |
205 friend class G1PrepareCompactClosure; | |
206 friend class RegionSorter; | |
2152 | 207 friend class RegionResetter; |
342 | 208 friend class CountRCClosure; |
209 friend class EvacPopObjClosure; | |
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210 friend class G1ParCleanupCTTask; |
342 | 211 |
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212 friend class G1FreeHumongousRegionClosure; |
342 | 213 // Other related classes. |
214 friend class G1MarkSweep; | |
215 | |
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216 // Testing classes. |
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217 friend class G1CheckCSetFastTableClosure; |
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218 |
342 | 219 private: |
220 // The one and only G1CollectedHeap, so static functions can find it. | |
221 static G1CollectedHeap* _g1h; | |
222 | |
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223 static size_t _humongous_object_threshold_in_words; |
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224 |
2152 | 225 // The secondary free list which contains regions that have been |
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226 // freed up during the cleanup process. This will be appended to |
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227 // the master free list when appropriate. |
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228 FreeRegionList _secondary_free_list; |
2152 | 229 |
4072 | 230 // It keeps track of the old regions. |
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231 HeapRegionSet _old_set; |
4072 | 232 |
2152 | 233 // It keeps track of the humongous regions. |
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234 HeapRegionSet _humongous_set; |
342 | 235 |
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236 void eagerly_reclaim_humongous_regions(); |
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237 |
342 | 238 // The number of regions we could create by expansion. |
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239 uint _expansion_regions; |
342 | 240 |
241 // The block offset table for the G1 heap. | |
242 G1BlockOffsetSharedArray* _bot_shared; | |
243 | |
4072 | 244 // Tears down the region sets / lists so that they are empty and the |
245 // regions on the heap do not belong to a region set / list. The | |
246 // only exception is the humongous set which we leave unaltered. If | |
247 // free_list_only is true, it will only tear down the master free | |
248 // list. It is called before a Full GC (free_list_only == false) or | |
249 // before heap shrinking (free_list_only == true). | |
250 void tear_down_region_sets(bool free_list_only); | |
251 | |
252 // Rebuilds the region sets / lists so that they are repopulated to | |
253 // reflect the contents of the heap. The only exception is the | |
254 // humongous set which was not torn down in the first place. If | |
255 // free_list_only is true, it will only rebuild the master free | |
256 // list. It is called after a Full GC (free_list_only == false) or | |
257 // after heap shrinking (free_list_only == true). | |
258 void rebuild_region_sets(bool free_list_only); | |
342 | 259 |
20337 | 260 // Callback for region mapping changed events. |
261 G1RegionMappingChangedListener _listener; | |
262 | |
342 | 263 // The sequence of all heap regions in the heap. |
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264 HeapRegionManager _hrm; |
342 | 265 |
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266 // Class that handles the different kinds of allocations. |
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267 G1Allocator* _allocator; |
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268 |
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269 // Statistics for each allocation context |
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270 AllocationContextStats _allocation_context_stats; |
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271 |
6595 | 272 // PLAB sizing policy for survivors. |
273 PLABStats _survivor_plab_stats; | |
274 | |
275 // PLAB sizing policy for tenured objects. | |
276 PLABStats _old_plab_stats; | |
277 | |
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278 // It specifies whether we should attempt to expand the heap after a |
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279 // region allocation failure. If heap expansion fails we set this to |
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280 // false so that we don't re-attempt the heap expansion (it's likely |
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281 // that subsequent expansion attempts will also fail if one fails). |
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282 // Currently, it is only consulted during GC and it's reset at the |
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283 // start of each GC. |
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284 bool _expand_heap_after_alloc_failure; |
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285 |
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286 // It resets the mutator alloc region before new allocations can take place. |
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287 void init_mutator_alloc_region(); |
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288 |
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289 // It releases the mutator alloc region. |
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290 void release_mutator_alloc_region(); |
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291 |
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292 // It initializes the GC alloc regions at the start of a GC. |
10405 | 293 void init_gc_alloc_regions(EvacuationInfo& evacuation_info); |
342 | 294 |
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295 // It releases the GC alloc regions at the end of a GC. |
10405 | 296 void release_gc_alloc_regions(uint no_of_gc_workers, EvacuationInfo& evacuation_info); |
342 | 297 |
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298 // It does any cleanup that needs to be done on the GC alloc regions |
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299 // before a Full GC. |
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300 void abandon_gc_alloc_regions(); |
342 | 301 |
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302 // Helper for monitoring and management support. |
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303 G1MonitoringSupport* _g1mm; |
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304 |
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305 // Records whether the region at the given index is (still) a |
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306 // candidate for eager reclaim. Only valid for humongous start |
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307 // regions; other regions have unspecified values. Humongous start |
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308 // regions are initialized at start of collection pause, with |
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309 // candidates removed from the set as they are found reachable from |
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310 // roots or the young generation. |
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311 class HumongousReclaimCandidates : public G1BiasedMappedArray<bool> { |
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312 protected: |
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313 bool default_value() const { return false; } |
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314 public: |
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315 void clear() { G1BiasedMappedArray<bool>::clear(); } |
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316 void set_candidate(uint region, bool value) { |
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317 set_by_index(region, value); |
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318 } |
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319 bool is_candidate(uint region) { |
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320 return get_by_index(region); |
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321 } |
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322 }; |
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323 |
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324 HumongousReclaimCandidates _humongous_reclaim_candidates; |
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325 // Stores whether during humongous object registration we found candidate regions. |
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326 // If not, we can skip a few steps. |
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327 bool _has_humongous_reclaim_candidates; |
526 | 328 |
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329 volatile unsigned _gc_time_stamp; |
342 | 330 |
331 size_t* _surviving_young_words; | |
332 | |
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333 G1HRPrinter _hr_printer; |
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334 |
342 | 335 void setup_surviving_young_words(); |
336 void update_surviving_young_words(size_t* surv_young_words); | |
337 void cleanup_surviving_young_words(); | |
338 | |
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339 // It decides whether an explicit GC should start a concurrent cycle |
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340 // instead of doing a STW GC. Currently, a concurrent cycle is |
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341 // explicitly started if: |
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342 // (a) cause == _gc_locker and +GCLockerInvokesConcurrent, or |
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343 // (b) cause == _java_lang_system_gc and +ExplicitGCInvokesConcurrent. |
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344 // (c) cause == _g1_humongous_allocation |
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345 bool should_do_concurrent_full_gc(GCCause::Cause cause); |
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346 |
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347 // Keeps track of how many "old marking cycles" (i.e., Full GCs or |
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348 // concurrent cycles) we have started. |
22936 | 349 volatile uint _old_marking_cycles_started; |
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350 |
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351 // Keeps track of how many "old marking cycles" (i.e., Full GCs or |
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352 // concurrent cycles) we have completed. |
22936 | 353 volatile uint _old_marking_cycles_completed; |
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354 |
10405 | 355 bool _concurrent_cycle_started; |
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356 bool _heap_summary_sent; |
10405 | 357 |
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358 // This is a non-product method that is helpful for testing. It is |
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359 // called at the end of a GC and artificially expands the heap by |
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360 // allocating a number of dead regions. This way we can induce very |
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361 // frequent marking cycles and stress the cleanup / concurrent |
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362 // cleanup code more (as all the regions that will be allocated by |
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363 // this method will be found dead by the marking cycle). |
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364 void allocate_dummy_regions() PRODUCT_RETURN; |
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365 |
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366 // Clear RSets after a compaction. It also resets the GC time stamps. |
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367 void clear_rsets_post_compaction(); |
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368 |
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369 // If the HR printer is active, dump the state of the regions in the |
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370 // heap after a compaction. |
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371 void print_hrm_post_compaction(); |
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372 |
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373 // Create a memory mapper for auxiliary data structures of the given size and |
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374 // translation factor. |
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375 static G1RegionToSpaceMapper* create_aux_memory_mapper(const char* description, |
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376 size_t size, |
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377 size_t translation_factor); |
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378 |
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379 double verify(bool guard, const char* msg); |
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380 void verify_before_gc(); |
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381 void verify_after_gc(); |
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382 |
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383 void log_gc_header(); |
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384 void log_gc_footer(double pause_time_sec); |
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385 |
1973 | 386 // These are macros so that, if the assert fires, we get the correct |
387 // line number, file, etc. | |
388 | |
2361 | 389 #define heap_locking_asserts_err_msg(_extra_message_) \ |
2152 | 390 err_msg("%s : Heap_lock locked: %s, at safepoint: %s, is VM thread: %s", \ |
2361 | 391 (_extra_message_), \ |
2152 | 392 BOOL_TO_STR(Heap_lock->owned_by_self()), \ |
393 BOOL_TO_STR(SafepointSynchronize::is_at_safepoint()), \ | |
394 BOOL_TO_STR(Thread::current()->is_VM_thread())) | |
1973 | 395 |
396 #define assert_heap_locked() \ | |
397 do { \ | |
398 assert(Heap_lock->owned_by_self(), \ | |
399 heap_locking_asserts_err_msg("should be holding the Heap_lock")); \ | |
400 } while (0) | |
401 | |
2361 | 402 #define assert_heap_locked_or_at_safepoint(_should_be_vm_thread_) \ |
1973 | 403 do { \ |
404 assert(Heap_lock->owned_by_self() || \ | |
2152 | 405 (SafepointSynchronize::is_at_safepoint() && \ |
2361 | 406 ((_should_be_vm_thread_) == Thread::current()->is_VM_thread())), \ |
1973 | 407 heap_locking_asserts_err_msg("should be holding the Heap_lock or " \ |
408 "should be at a safepoint")); \ | |
409 } while (0) | |
410 | |
411 #define assert_heap_locked_and_not_at_safepoint() \ | |
412 do { \ | |
413 assert(Heap_lock->owned_by_self() && \ | |
414 !SafepointSynchronize::is_at_safepoint(), \ | |
415 heap_locking_asserts_err_msg("should be holding the Heap_lock and " \ | |
416 "should not be at a safepoint")); \ | |
417 } while (0) | |
418 | |
419 #define assert_heap_not_locked() \ | |
420 do { \ | |
421 assert(!Heap_lock->owned_by_self(), \ | |
422 heap_locking_asserts_err_msg("should not be holding the Heap_lock")); \ | |
423 } while (0) | |
424 | |
425 #define assert_heap_not_locked_and_not_at_safepoint() \ | |
426 do { \ | |
427 assert(!Heap_lock->owned_by_self() && \ | |
428 !SafepointSynchronize::is_at_safepoint(), \ | |
429 heap_locking_asserts_err_msg("should not be holding the Heap_lock and " \ | |
430 "should not be at a safepoint")); \ | |
431 } while (0) | |
432 | |
2361 | 433 #define assert_at_safepoint(_should_be_vm_thread_) \ |
1973 | 434 do { \ |
2152 | 435 assert(SafepointSynchronize::is_at_safepoint() && \ |
2361 | 436 ((_should_be_vm_thread_) == Thread::current()->is_VM_thread()), \ |
1973 | 437 heap_locking_asserts_err_msg("should be at a safepoint")); \ |
438 } while (0) | |
439 | |
440 #define assert_not_at_safepoint() \ | |
441 do { \ | |
442 assert(!SafepointSynchronize::is_at_safepoint(), \ | |
443 heap_locking_asserts_err_msg("should not be at a safepoint")); \ | |
444 } while (0) | |
445 | |
342 | 446 protected: |
447 | |
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448 // The young region list. |
342 | 449 YoungList* _young_list; |
450 | |
451 // The current policy object for the collector. | |
452 G1CollectorPolicy* _g1_policy; | |
453 | |
2152 | 454 // This is the second level of trying to allocate a new region. If |
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455 // new_region() didn't find a region on the free_list, this call will |
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456 // check whether there's anything available on the |
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457 // secondary_free_list and/or wait for more regions to appear on |
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458 // that list, if _free_regions_coming is set. |
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459 HeapRegion* new_region_try_secondary_free_list(bool is_old); |
342 | 460 |
2361 | 461 // Try to allocate a single non-humongous HeapRegion sufficient for |
462 // an allocation of the given word_size. If do_expand is true, | |
463 // attempt to expand the heap if necessary to satisfy the allocation | |
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464 // request. If the region is to be used as an old region or for a |
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465 // humongous object, set is_old to true. If not, to false. |
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466 HeapRegion* new_region(size_t word_size, bool is_old, bool do_expand); |
342 | 467 |
2361 | 468 // Initialize a contiguous set of free regions of length num_regions |
469 // and starting at index first so that they appear as a single | |
470 // humongous region. | |
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471 HeapWord* humongous_obj_allocate_initialize_regions(uint first, |
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472 uint num_regions, |
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473 size_t word_size, |
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474 AllocationContext_t context); |
2361 | 475 |
476 // Attempt to allocate a humongous object of the given size. Return | |
477 // NULL if unsuccessful. | |
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478 HeapWord* humongous_obj_allocate(size_t word_size, AllocationContext_t context); |
1973 | 479 |
480 // The following two methods, allocate_new_tlab() and | |
481 // mem_allocate(), are the two main entry points from the runtime | |
482 // into the G1's allocation routines. They have the following | |
483 // assumptions: | |
484 // | |
485 // * They should both be called outside safepoints. | |
486 // | |
487 // * They should both be called without holding the Heap_lock. | |
488 // | |
489 // * All allocation requests for new TLABs should go to | |
490 // allocate_new_tlab(). | |
491 // | |
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492 // * All non-TLAB allocation requests should go to mem_allocate(). |
1973 | 493 // |
494 // * If either call cannot satisfy the allocation request using the | |
495 // current allocating region, they will try to get a new one. If | |
496 // this fails, they will attempt to do an evacuation pause and | |
497 // retry the allocation. | |
498 // | |
499 // * If all allocation attempts fail, even after trying to schedule | |
500 // an evacuation pause, allocate_new_tlab() will return NULL, | |
501 // whereas mem_allocate() will attempt a heap expansion and/or | |
502 // schedule a Full GC. | |
503 // | |
504 // * We do not allow humongous-sized TLABs. So, allocate_new_tlab | |
505 // should never be called with word_size being humongous. All | |
506 // humongous allocation requests should go to mem_allocate() which | |
507 // will satisfy them with a special path. | |
508 | |
509 virtual HeapWord* allocate_new_tlab(size_t word_size); | |
510 | |
511 virtual HeapWord* mem_allocate(size_t word_size, | |
512 bool* gc_overhead_limit_was_exceeded); | |
342 | 513 |
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514 // The following three methods take a gc_count_before_ret |
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515 // parameter which is used to return the GC count if the method |
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516 // returns NULL. Given that we are required to read the GC count |
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517 // while holding the Heap_lock, and these paths will take the |
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518 // Heap_lock at some point, it's easier to get them to read the GC |
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519 // count while holding the Heap_lock before they return NULL instead |
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520 // of the caller (namely: mem_allocate()) having to also take the |
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521 // Heap_lock just to read the GC count. |
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522 |
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523 // First-level mutator allocation attempt: try to allocate out of |
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524 // the mutator alloc region without taking the Heap_lock. This |
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525 // should only be used for non-humongous allocations. |
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526 inline HeapWord* attempt_allocation(size_t word_size, |
22936 | 527 uint* gc_count_before_ret, |
528 uint* gclocker_retry_count_ret); | |
342 | 529 |
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530 // Second-level mutator allocation attempt: take the Heap_lock and |
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531 // retry the allocation attempt, potentially scheduling a GC |
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532 // pause. This should only be used for non-humongous allocations. |
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533 HeapWord* attempt_allocation_slow(size_t word_size, |
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534 AllocationContext_t context, |
22936 | 535 uint* gc_count_before_ret, |
536 uint* gclocker_retry_count_ret); | |
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537 |
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538 // Takes the Heap_lock and attempts a humongous allocation. It can |
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539 // potentially schedule a GC pause. |
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540 HeapWord* attempt_allocation_humongous(size_t word_size, |
22936 | 541 uint* gc_count_before_ret, |
542 uint* gclocker_retry_count_ret); | |
1973 | 543 |
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544 // Allocation attempt that should be called during safepoints (e.g., |
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545 // at the end of a successful GC). expect_null_mutator_alloc_region |
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546 // specifies whether the mutator alloc region is expected to be NULL |
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547 // or not. |
1973 | 548 HeapWord* attempt_allocation_at_safepoint(size_t word_size, |
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549 AllocationContext_t context, |
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550 bool expect_null_mutator_alloc_region); |
1973 | 551 |
552 // It dirties the cards that cover the block so that so that the post | |
553 // write barrier never queues anything when updating objects on this | |
554 // block. It is assumed (and in fact we assert) that the block | |
555 // belongs to a young region. | |
556 inline void dirty_young_block(HeapWord* start, size_t word_size); | |
342 | 557 |
558 // Allocate blocks during garbage collection. Will ensure an | |
559 // allocation region, either by picking one or expanding the | |
560 // heap, and then allocate a block of the given size. The block | |
561 // may not be a humongous - it must fit into a single heap region. | |
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562 inline HeapWord* par_allocate_during_gc(InCSetState dest, |
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563 size_t word_size, |
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564 AllocationContext_t context); |
342 | 565 // Ensure that no further allocations can happen in "r", bearing in mind |
566 // that parallel threads might be attempting allocations. | |
567 void par_allocate_remaining_space(HeapRegion* r); | |
568 | |
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569 // Allocation attempt during GC for a survivor object / PLAB. |
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570 inline HeapWord* survivor_attempt_allocation(size_t word_size, |
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571 AllocationContext_t context); |
545 | 572 |
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573 // Allocation attempt during GC for an old object / PLAB. |
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574 inline HeapWord* old_attempt_allocation(size_t word_size, |
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575 AllocationContext_t context); |
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576 |
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577 // These methods are the "callbacks" from the G1AllocRegion class. |
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578 |
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579 // For mutator alloc regions. |
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580 HeapRegion* new_mutator_alloc_region(size_t word_size, bool force); |
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581 void retire_mutator_alloc_region(HeapRegion* alloc_region, |
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582 size_t allocated_bytes); |
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583 |
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584 // For GC alloc regions. |
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585 HeapRegion* new_gc_alloc_region(size_t word_size, uint count, |
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586 InCSetState dest); |
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587 void retire_gc_alloc_region(HeapRegion* alloc_region, |
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588 size_t allocated_bytes, InCSetState dest); |
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589 |
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590 // - if explicit_gc is true, the GC is for a System.gc() or a heap |
1973 | 591 // inspection request and should collect the entire heap |
592 // - if clear_all_soft_refs is true, all soft references should be | |
593 // cleared during the GC | |
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594 // - if explicit_gc is false, word_size describes the allocation that |
1973 | 595 // the GC should attempt (at least) to satisfy |
596 // - it returns false if it is unable to do the collection due to the | |
597 // GC locker being active, true otherwise | |
598 bool do_collection(bool explicit_gc, | |
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599 bool clear_all_soft_refs, |
342 | 600 size_t word_size); |
601 | |
602 // Callback from VM_G1CollectFull operation. | |
603 // Perform a full collection. | |
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604 virtual void do_full_collection(bool clear_all_soft_refs); |
342 | 605 |
606 // Resize the heap if necessary after a full collection. If this is | |
607 // after a collect-for allocation, "word_size" is the allocation size, | |
608 // and will be considered part of the used portion of the heap. | |
609 void resize_if_necessary_after_full_collection(size_t word_size); | |
610 | |
611 // Callback from VM_G1CollectForAllocation operation. | |
612 // This function does everything necessary/possible to satisfy a | |
613 // failed allocation request (including collection, expansion, etc.) | |
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614 HeapWord* satisfy_failed_allocation(size_t word_size, |
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615 AllocationContext_t context, |
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616 bool* succeeded); |
342 | 617 |
618 // Attempting to expand the heap sufficiently | |
619 // to support an allocation of the given "word_size". If | |
620 // successful, perform the allocation and return the address of the | |
621 // allocated block, or else "NULL". | |
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622 HeapWord* expand_and_allocate(size_t word_size, AllocationContext_t context); |
342 | 623 |
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624 // Process any reference objects discovered during |
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625 // an incremental evacuation pause. |
6819 | 626 void process_discovered_references(uint no_of_gc_workers); |
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627 |
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628 // Enqueue any remaining discovered references |
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629 // after processing. |
6819 | 630 void enqueue_discovered_references(uint no_of_gc_workers); |
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631 |
342 | 632 public: |
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633 |
20417 | 634 G1Allocator* allocator() { |
635 return _allocator; | |
636 } | |
637 | |
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638 G1MonitoringSupport* g1mm() { |
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639 assert(_g1mm != NULL, "should have been initialized"); |
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640 return _g1mm; |
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641 } |
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642 |
342 | 643 // Expand the garbage-first heap by at least the given size (in bytes!). |
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644 // Returns true if the heap was expanded by the requested amount; |
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645 // false otherwise. |
342 | 646 // (Rounds up to a HeapRegion boundary.) |
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647 bool expand(size_t expand_bytes); |
342 | 648 |
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649 // Returns the PLAB statistics for a given destination. |
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650 inline PLABStats* alloc_buffer_stats(InCSetState dest); |
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651 |
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652 // Determines PLAB size for a given destination. |
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653 inline size_t desired_plab_sz(InCSetState dest); |
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654 |
20445
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655 inline AllocationContextStats& allocation_context_stats(); |
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656 |
342 | 657 // Do anything common to GC's. |
658 virtual void gc_prologue(bool full); | |
659 virtual void gc_epilogue(bool full); | |
660 | |
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661 // Modify the reclaim candidate set and test for presence. |
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662 // These are only valid for starts_humongous regions. |
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663 inline void set_humongous_reclaim_candidate(uint region, bool value); |
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664 inline bool is_humongous_reclaim_candidate(uint region); |
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665 |
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666 // Remove from the reclaim candidate set. Also remove from the |
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667 // collection set so that later encounters avoid the slow path. |
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668 inline void set_humongous_is_live(oop obj); |
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669 |
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670 // Register the given region to be part of the collection set. |
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671 inline void register_humongous_region_with_in_cset_fast_test(uint index); |
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672 // Register regions with humongous objects (actually on the start region) in |
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673 // the in_cset_fast_test table. |
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674 void register_humongous_regions_with_in_cset_fast_test(); |
526 | 675 // We register a region with the fast "in collection set" test. We |
676 // simply set to true the array slot corresponding to this region. | |
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677 void register_young_region_with_in_cset_fast_test(HeapRegion* r) { |
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678 _in_cset_fast_test.set_in_young(r->hrm_index()); |
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679 } |
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680 void register_old_region_with_in_cset_fast_test(HeapRegion* r) { |
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681 _in_cset_fast_test.set_in_old(r->hrm_index()); |
526 | 682 } |
683 | |
684 // This is a fast test on whether a reference points into the | |
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685 // collection set or not. Assume that the reference |
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686 // points into the heap. |
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687 inline bool in_cset_fast_test(oop obj); |
526 | 688 |
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689 void clear_cset_fast_test() { |
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690 _in_cset_fast_test.clear(); |
1394
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691 } |
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692 |
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693 // This is called at the start of either a concurrent cycle or a Full |
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694 // GC to update the number of old marking cycles started. |
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695 void increment_old_marking_cycles_started(); |
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696 |
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697 // This is called at the end of either a concurrent cycle or a Full |
6120
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698 // GC to update the number of old marking cycles completed. Those two |
1656
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699 // can happen in a nested fashion, i.e., we start a concurrent |
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700 // cycle, a Full GC happens half-way through it which ends first, |
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701 // and then the cycle notices that a Full GC happened and ends |
2030
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702 // too. The concurrent parameter is a boolean to help us do a bit |
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703 // tighter consistency checking in the method. If concurrent is |
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704 // false, the caller is the inner caller in the nesting (i.e., the |
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705 // Full GC). If concurrent is true, the caller is the outer caller |
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706 // in this nesting (i.e., the concurrent cycle). Further nesting is |
6120
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707 // not currently supported. The end of this call also notifies |
2030
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diff
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708 // the FullGCCount_lock in case a Java thread is waiting for a full |
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709 // GC to happen (e.g., it called System.gc() with |
1656
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|
710 // +ExplicitGCInvokesConcurrent). |
6120
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|
711 void increment_old_marking_cycles_completed(bool concurrent); |
1656
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|
712 |
22936 | 713 uint old_marking_cycles_completed() { |
6120
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|
714 return _old_marking_cycles_completed; |
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|
715 } |
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|
716 |
13400
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717 void register_concurrent_cycle_start(const Ticks& start_time); |
10405 | 718 void register_concurrent_cycle_end(); |
719 void trace_heap_after_concurrent_cycle(); | |
720 | |
721 G1YCType yc_type(); | |
722 | |
3778
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|
723 G1HRPrinter* hr_printer() { return &_hr_printer; } |
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|
724 |
17736
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|
725 // Frees a non-humongous region by initializing its contents and |
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|
726 // adding it to the free list that's passed as a parameter (this is |
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8034079: G1: Refactor the HeapRegionSet hierarchy
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727 // usually a local list which will be appended to the master free |
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|
728 // list later). The used bytes of freed regions are accumulated in |
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|
729 // pre_used. If par is true, the region's RSet will not be freed |
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730 // up. The assumption is that this will be done later. |
17755
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731 // The locked parameter indicates if the caller has already taken |
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|
732 // care of proper synchronization. This may allow some optimizations. |
17736
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733 void free_region(HeapRegion* hr, |
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|
734 FreeRegionList* free_list, |
17755
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|
735 bool par, |
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|
736 bool locked = false); |
17736
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|
737 |
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|
738 // Frees a humongous region by collapsing it into individual regions |
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|
739 // and calling free_region() for each of them. The freed regions |
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740 // will be added to the free list that's passed as a parameter (this |
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741 // is usually a local list which will be appended to the master free |
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|
742 // list later). The used bytes of freed regions are accumulated in |
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|
743 // pre_used. If par is true, the region's RSet will not be freed |
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744 // up. The assumption is that this will be done later. |
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|
745 void free_humongous_region(HeapRegion* hr, |
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|
746 FreeRegionList* free_list, |
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|
747 bool par); |
342 | 748 protected: |
749 | |
750 // Shrink the garbage-first heap by at most the given size (in bytes!). | |
751 // (Rounds down to a HeapRegion boundary.) | |
752 virtual void shrink(size_t expand_bytes); | |
753 void shrink_helper(size_t expand_bytes); | |
754 | |
1709 | 755 #if TASKQUEUE_STATS |
756 static void print_taskqueue_stats_hdr(outputStream* const st = gclog_or_tty); | |
757 void print_taskqueue_stats(outputStream* const st = gclog_or_tty) const; | |
758 void reset_taskqueue_stats(); | |
759 #endif // TASKQUEUE_STATS | |
760 | |
1973 | 761 // Schedule the VM operation that will do an evacuation pause to |
762 // satisfy an allocation request of word_size. *succeeded will | |
763 // return whether the VM operation was successful (it did do an | |
764 // evacuation pause) or not (another thread beat us to it or the GC | |
765 // locker was active). Given that we should not be holding the | |
766 // Heap_lock when we enter this method, we will pass the | |
767 // gc_count_before (i.e., total_collections()) as a parameter since | |
768 // it has to be read while holding the Heap_lock. Currently, both | |
769 // methods that call do_collection_pause() release the Heap_lock | |
770 // before the call, so it's easy to read gc_count_before just before. | |
12113
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|
771 HeapWord* do_collection_pause(size_t word_size, |
22936 | 772 uint gc_count_before, |
12113
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|
773 bool* succeeded, |
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|
774 GCCause::Cause gc_cause); |
342 | 775 |
776 // The guts of the incremental collection pause, executed by the vm | |
1973 | 777 // thread. It returns false if it is unable to do the collection due |
778 // to the GC locker being active, true otherwise | |
779 bool do_collection_pause_at_safepoint(double target_pause_time_ms); | |
342 | 780 |
781 // Actually do the work of evacuating the collection set. | |
10405 | 782 void evacuate_collection_set(EvacuationInfo& evacuation_info); |
342 | 783 |
784 // The g1 remembered set of the heap. | |
785 G1RemSet* _g1_rem_set; | |
786 | |
616
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6720309: G1: don't synchronously update RSet during evacuation pauses
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diff
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|
787 // A set of cards that cover the objects for which the Rsets should be updated |
4f360ec815ba
6720309: G1: don't synchronously update RSet during evacuation pauses
iveresov
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545
diff
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|
788 // concurrently after the collection. |
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diff
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|
789 DirtyCardQueueSet _dirty_card_queue_set; |
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|
790 |
342 | 791 // The closure used to refine a single card. |
792 RefineCardTableEntryClosure* _refine_cte_cl; | |
793 | |
794 // A function to check the consistency of dirty card logs. | |
795 void check_ct_logs_at_safepoint(); | |
796 | |
1705 | 797 // A DirtyCardQueueSet that is used to hold cards that contain |
798 // references into the current collection set. This is used to | |
799 // update the remembered sets of the regions in the collection | |
800 // set in the event of an evacuation failure. | |
801 DirtyCardQueueSet _into_cset_dirty_card_queue_set; | |
802 | |
342 | 803 // After a collection pause, make the regions in the CS into free |
804 // regions. | |
10405 | 805 void free_collection_set(HeapRegion* cs_head, EvacuationInfo& evacuation_info); |
342 | 806 |
1394
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|
807 // Abandon the current collection set without recording policy |
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diff
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|
808 // statistics or updating free lists. |
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|
809 void abandon_collection_set(HeapRegion* cs_head); |
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|
810 |
342 | 811 // The concurrent marker (and the thread it runs in.) |
812 ConcurrentMark* _cm; | |
813 ConcurrentMarkThread* _cmThread; | |
814 bool _mark_in_progress; | |
815 | |
816 // The concurrent refiner. | |
817 ConcurrentG1Refine* _cg1r; | |
818 | |
819 // The parallel task queues | |
820 RefToScanQueueSet *_task_queues; | |
821 | |
822 // True iff a evacuation has failed in the current collection. | |
823 bool _evacuation_failed; | |
824 | |
10405 | 825 EvacuationFailedInfo* _evacuation_failed_info_array; |
342 | 826 |
827 // Failed evacuations cause some logical from-space objects to have | |
828 // forwarding pointers to themselves. Reset them. | |
829 void remove_self_forwarding_pointers(); | |
830 | |
8038
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831 // Together, these store an object with a preserved mark, and its mark value. |
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832 Stack<oop, mtGC> _objs_with_preserved_marks; |
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833 Stack<markOop, mtGC> _preserved_marks_of_objs; |
342 | 834 |
835 // Preserve the mark of "obj", if necessary, in preparation for its mark | |
836 // word being overwritten with a self-forwarding-pointer. | |
837 void preserve_mark_if_necessary(oop obj, markOop m); | |
838 | |
839 // The stack of evac-failure objects left to be scanned. | |
840 GrowableArray<oop>* _evac_failure_scan_stack; | |
841 // The closure to apply to evac-failure objects. | |
842 | |
843 OopsInHeapRegionClosure* _evac_failure_closure; | |
844 // Set the field above. | |
845 void | |
846 set_evac_failure_closure(OopsInHeapRegionClosure* evac_failure_closure) { | |
847 _evac_failure_closure = evac_failure_closure; | |
848 } | |
849 | |
850 // Push "obj" on the scan stack. | |
851 void push_on_evac_failure_scan_stack(oop obj); | |
852 // Process scan stack entries until the stack is empty. | |
853 void drain_evac_failure_scan_stack(); | |
854 // True iff an invocation of "drain_scan_stack" is in progress; to | |
855 // prevent unnecessary recursion. | |
856 bool _drain_in_progress; | |
857 | |
858 // Do any necessary initialization for evacuation-failure handling. | |
859 // "cl" is the closure that will be used to process evac-failure | |
860 // objects. | |
861 void init_for_evac_failure(OopsInHeapRegionClosure* cl); | |
862 // Do any necessary cleanup for evacuation-failure handling data | |
863 // structures. | |
864 void finalize_for_evac_failure(); | |
865 | |
866 // An attempt to evacuate "obj" has failed; take necessary steps. | |
10405 | 867 oop handle_evacuation_failure_par(G1ParScanThreadState* _par_scan_state, oop obj); |
342 | 868 void handle_evacuation_failure_common(oop obj, markOop m); |
869 | |
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870 #ifndef PRODUCT |
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871 // Support for forcing evacuation failures. Analogous to |
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872 // PromotionFailureALot for the other collectors. |
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873 |
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874 // Records whether G1EvacuationFailureALot should be in effect |
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875 // for the current GC |
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876 bool _evacuation_failure_alot_for_current_gc; |
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877 |
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878 // Used to record the GC number for interval checking when |
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879 // determining whether G1EvaucationFailureALot is in effect |
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880 // for the current GC. |
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881 size_t _evacuation_failure_alot_gc_number; |
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882 |
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883 // Count of the number of evacuations between failures. |
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884 volatile size_t _evacuation_failure_alot_count; |
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885 |
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886 // Set whether G1EvacuationFailureALot should be in effect |
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887 // for the current GC (based upon the type of GC and which |
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888 // command line flags are set); |
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889 inline bool evacuation_failure_alot_for_gc_type(bool gcs_are_young, |
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890 bool during_initial_mark, |
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891 bool during_marking); |
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892 |
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893 inline void set_evacuation_failure_alot_for_current_gc(); |
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894 |
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895 // Return true if it's time to cause an evacuation failure. |
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896 inline bool evacuation_should_fail(); |
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897 |
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898 // Reset the G1EvacuationFailureALot counters. Should be called at |
10405 | 899 // the end of an evacuation pause in which an evacuation failure occurred. |
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900 inline void reset_evacuation_should_fail(); |
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901 #endif // !PRODUCT |
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902 |
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903 // ("Weak") Reference processing support. |
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904 // |
10405 | 905 // G1 has 2 instances of the reference processor class. One |
3979
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906 // (_ref_processor_cm) handles reference object discovery |
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907 // and subsequent processing during concurrent marking cycles. |
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908 // |
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909 // The other (_ref_processor_stw) handles reference object |
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910 // discovery and processing during full GCs and incremental |
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911 // evacuation pauses. |
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912 // |
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913 // During an incremental pause, reference discovery will be |
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914 // temporarily disabled for _ref_processor_cm and will be |
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915 // enabled for _ref_processor_stw. At the end of the evacuation |
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916 // pause references discovered by _ref_processor_stw will be |
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917 // processed and discovery will be disabled. The previous |
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918 // setting for reference object discovery for _ref_processor_cm |
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919 // will be re-instated. |
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920 // |
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921 // At the start of marking: |
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922 // * Discovery by the CM ref processor is verified to be inactive |
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923 // and it's discovered lists are empty. |
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924 // * Discovery by the CM ref processor is then enabled. |
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925 // |
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926 // At the end of marking: |
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927 // * Any references on the CM ref processor's discovered |
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928 // lists are processed (possibly MT). |
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929 // |
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930 // At the start of full GC we: |
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931 // * Disable discovery by the CM ref processor and |
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932 // empty CM ref processor's discovered lists |
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933 // (without processing any entries). |
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934 // * Verify that the STW ref processor is inactive and it's |
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935 // discovered lists are empty. |
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936 // * Temporarily set STW ref processor discovery as single threaded. |
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937 // * Temporarily clear the STW ref processor's _is_alive_non_header |
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938 // field. |
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939 // * Finally enable discovery by the STW ref processor. |
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940 // |
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941 // The STW ref processor is used to record any discovered |
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942 // references during the full GC. |
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943 // |
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944 // At the end of a full GC we: |
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945 // * Enqueue any reference objects discovered by the STW ref processor |
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946 // that have non-live referents. This has the side-effect of |
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947 // making the STW ref processor inactive by disabling discovery. |
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948 // * Verify that the CM ref processor is still inactive |
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949 // and no references have been placed on it's discovered |
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950 // lists (also checked as a precondition during initial marking). |
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951 |
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952 // The (stw) reference processor... |
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953 ReferenceProcessor* _ref_processor_stw; |
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954 |
10405 | 955 STWGCTimer* _gc_timer_stw; |
956 ConcurrentGCTimer* _gc_timer_cm; | |
957 | |
958 G1OldTracer* _gc_tracer_cm; | |
959 G1NewTracer* _gc_tracer_stw; | |
960 | |
3979
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961 // During reference object discovery, the _is_alive_non_header |
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962 // closure (if non-null) is applied to the referent object to |
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963 // determine whether the referent is live. If so then the |
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964 // reference object does not need to be 'discovered' and can |
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965 // be treated as a regular oop. This has the benefit of reducing |
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966 // the number of 'discovered' reference objects that need to |
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967 // be processed. |
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968 // |
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969 // Instance of the is_alive closure for embedding into the |
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970 // STW reference processor as the _is_alive_non_header field. |
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971 // Supplying a value for the _is_alive_non_header field is |
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972 // optional but doing so prevents unnecessary additions to |
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973 // the discovered lists during reference discovery. |
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974 G1STWIsAliveClosure _is_alive_closure_stw; |
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975 |
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976 // The (concurrent marking) reference processor... |
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977 ReferenceProcessor* _ref_processor_cm; |
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978 |
2037
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979 // Instance of the concurrent mark is_alive closure for embedding |
3979
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980 // into the Concurrent Marking reference processor as the |
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981 // _is_alive_non_header field. Supplying a value for the |
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982 // _is_alive_non_header field is optional but doing so prevents |
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983 // unnecessary additions to the discovered lists during reference |
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984 // discovery. |
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985 G1CMIsAliveClosure _is_alive_closure_cm; |
342 | 986 |
4709
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987 // Cache used by G1CollectedHeap::start_cset_region_for_worker(). |
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988 HeapRegion** _worker_cset_start_region; |
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989 |
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990 // Time stamp to validate the regions recorded in the cache |
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991 // used by G1CollectedHeap::start_cset_region_for_worker(). |
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992 // The heap region entry for a given worker is valid iff |
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993 // the associated time stamp value matches the current value |
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994 // of G1CollectedHeap::_gc_time_stamp. |
22936 | 995 uint* _worker_cset_start_region_time_stamp; |
4709
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996 |
2152 | 997 volatile bool _free_regions_coming; |
342 | 998 |
999 public: | |
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1000 |
342 | 1001 void set_refine_cte_cl_concurrency(bool concurrent); |
1002 | |
1709 | 1003 RefToScanQueue *task_queue(int i) const; |
342 | 1004 |
616
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1005 // A set of cards where updates happened during the GC |
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1006 DirtyCardQueueSet& dirty_card_queue_set() { return _dirty_card_queue_set; } |
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1007 |
1705 | 1008 // A DirtyCardQueueSet that is used to hold cards that contain |
1009 // references into the current collection set. This is used to | |
1010 // update the remembered sets of the regions in the collection | |
1011 // set in the event of an evacuation failure. | |
1012 DirtyCardQueueSet& into_cset_dirty_card_queue_set() | |
1013 { return _into_cset_dirty_card_queue_set; } | |
1014 | |
342 | 1015 // Create a G1CollectedHeap with the specified policy. |
1016 // Must call the initialize method afterwards. | |
1017 // May not return if something goes wrong. | |
1018 G1CollectedHeap(G1CollectorPolicy* policy); | |
1019 | |
1020 // Initialize the G1CollectedHeap to have the initial and | |
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1021 // maximum sizes and remembered and barrier sets |
342 | 1022 // specified by the policy object. |
1023 jint initialize(); | |
1024 | |
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1025 virtual void stop(); |
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1026 |
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1027 // Return the (conservative) maximum heap alignment for any G1 heap |
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1028 static size_t conservative_max_heap_alignment(); |
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1029 |
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1030 // Initialize weak reference processing. |
2037
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1031 virtual void ref_processing_init(); |
342 | 1032 |
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1033 // Explicitly import set_par_threads into this scope |
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1034 using SharedHeap::set_par_threads; |
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1035 // Set _n_par_threads according to a policy TBD. |
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1036 void set_par_threads(); |
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1037 |
342 | 1038 virtual CollectedHeap::Name kind() const { |
1039 return CollectedHeap::G1CollectedHeap; | |
1040 } | |
1041 | |
1042 // The current policy object for the collector. | |
1043 G1CollectorPolicy* g1_policy() const { return _g1_policy; } | |
1044 | |
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1045 virtual CollectorPolicy* collector_policy() const { return (CollectorPolicy*) g1_policy(); } |
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1046 |
342 | 1047 // Adaptive size policy. No such thing for g1. |
1048 virtual AdaptiveSizePolicy* size_policy() { return NULL; } | |
1049 | |
1050 // The rem set and barrier set. | |
1051 G1RemSet* g1_rem_set() const { return _g1_rem_set; } | |
1052 | |
1053 unsigned get_gc_time_stamp() { | |
1054 return _gc_time_stamp; | |
1055 } | |
1056 | |
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1057 inline void reset_gc_time_stamp(); |
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1058 |
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1059 void check_gc_time_stamps() PRODUCT_RETURN; |
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1060 |
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1061 inline void increment_gc_time_stamp(); |
342 | 1062 |
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1063 // Reset the given region's GC timestamp. If it's starts humongous, |
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1064 // also reset the GC timestamp of its corresponding |
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1065 // continues humongous regions too. |
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1066 void reset_gc_time_stamps(HeapRegion* hr); |
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1067 |
1705 | 1068 void iterate_dirty_card_closure(CardTableEntryClosure* cl, |
1069 DirtyCardQueue* into_cset_dcq, | |
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1070 bool concurrent, uint worker_i); |
342 | 1071 |
1072 // The shared block offset table array. | |
1073 G1BlockOffsetSharedArray* bot_shared() const { return _bot_shared; } | |
1074 | |
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1075 // Reference Processing accessors |
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1076 |
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1077 // The STW reference processor.... |
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1078 ReferenceProcessor* ref_processor_stw() const { return _ref_processor_stw; } |
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1079 |
10405 | 1080 // The Concurrent Marking reference processor... |
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1081 ReferenceProcessor* ref_processor_cm() const { return _ref_processor_cm; } |
342 | 1082 |
10405 | 1083 ConcurrentGCTimer* gc_timer_cm() const { return _gc_timer_cm; } |
1084 G1OldTracer* gc_tracer_cm() const { return _gc_tracer_cm; } | |
1085 | |
342 | 1086 virtual size_t capacity() const; |
1087 virtual size_t used() const; | |
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1088 // This should be called when we're not holding the heap lock. The |
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1089 // result might be a bit inaccurate. |
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1090 size_t used_unlocked() const; |
342 | 1091 size_t recalculate_used() const; |
1092 | |
1093 // These virtual functions do the actual allocation. | |
1094 // Some heaps may offer a contiguous region for shared non-blocking | |
1095 // allocation, via inlined code (by exporting the address of the top and | |
1096 // end fields defining the extent of the contiguous allocation region.) | |
1097 // But G1CollectedHeap doesn't yet support this. | |
1098 | |
1099 virtual bool is_maximal_no_gc() const { | |
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1100 return _hrm.available() == 0; |
342 | 1101 } |
1102 | |
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1103 // The current number of regions in the heap. |
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1104 uint num_regions() const { return _hrm.length(); } |
3766 | 1105 |
1106 // The max number of regions in the heap. | |
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1107 uint max_regions() const { return _hrm.max_length(); } |
342 | 1108 |
1109 // The number of regions that are completely free. | |
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1110 uint num_free_regions() const { return _hrm.num_free_regions(); } |
342 | 1111 |
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1112 MemoryUsage get_auxiliary_data_memory_usage() const { |
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1113 return _hrm.get_auxiliary_data_memory_usage(); |
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1114 } |
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1115 |
342 | 1116 // The number of regions that are not completely free. |
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1117 uint num_used_regions() const { return num_regions() - num_free_regions(); } |
3766 | 1118 |
3317
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1119 void verify_not_dirty_region(HeapRegion* hr) PRODUCT_RETURN; |
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1120 void verify_dirty_region(HeapRegion* hr) PRODUCT_RETURN; |
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1121 void verify_dirty_young_list(HeapRegion* head) PRODUCT_RETURN; |
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1122 void verify_dirty_young_regions() PRODUCT_RETURN; |
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1123 |
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1124 #ifndef PRODUCT |
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1125 // Make sure that the given bitmap has no marked objects in the |
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1126 // range [from,limit). If it does, print an error message and return |
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1127 // false. Otherwise, just return true. bitmap_name should be "prev" |
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1128 // or "next". |
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1129 bool verify_no_bits_over_tams(const char* bitmap_name, CMBitMapRO* bitmap, |
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1130 HeapWord* from, HeapWord* limit); |
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1131 |
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1132 // Verify that the prev / next bitmap range [tams,end) for the given |
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1133 // region has no marks. Return true if all is well, false if errors |
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1134 // are detected. |
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1135 bool verify_bitmaps(const char* caller, HeapRegion* hr); |
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1136 #endif // PRODUCT |
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1137 |
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1138 // If G1VerifyBitmaps is set, verify that the marking bitmaps for |
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1139 // the given region do not have any spurious marks. If errors are |
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1140 // detected, print appropriate error messages and crash. |
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1141 void check_bitmaps(const char* caller, HeapRegion* hr) PRODUCT_RETURN; |
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1142 |
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1143 // If G1VerifyBitmaps is set, verify that the marking bitmaps do not |
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1144 // have any spurious marks. If errors are detected, print |
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1145 // appropriate error messages and crash. |
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1146 void check_bitmaps(const char* caller) PRODUCT_RETURN; |
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1147 |
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1148 // Do sanity check on the contents of the in-cset fast test table. |
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1149 bool check_cset_fast_test() PRODUCT_RETURN_( return true; ); |
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1150 |
2152 | 1151 // verify_region_sets() performs verification over the region |
1152 // lists. It will be compiled in the product code to be used when | |
1153 // necessary (i.e., during heap verification). | |
1154 void verify_region_sets(); | |
342 | 1155 |
2152 | 1156 // verify_region_sets_optional() is planted in the code for |
1157 // list verification in non-product builds (and it can be enabled in | |
10405 | 1158 // product builds by defining HEAP_REGION_SET_FORCE_VERIFY to be 1). |
2152 | 1159 #if HEAP_REGION_SET_FORCE_VERIFY |
1160 void verify_region_sets_optional() { | |
1161 verify_region_sets(); | |
1162 } | |
1163 #else // HEAP_REGION_SET_FORCE_VERIFY | |
1164 void verify_region_sets_optional() { } | |
1165 #endif // HEAP_REGION_SET_FORCE_VERIFY | |
342 | 1166 |
2152 | 1167 #ifdef ASSERT |
2361 | 1168 bool is_on_master_free_list(HeapRegion* hr) { |
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1169 return _hrm.is_free(hr); |
2152 | 1170 } |
1171 #endif // ASSERT | |
342 | 1172 |
2152 | 1173 // Wrapper for the region list operations that can be called from |
1174 // methods outside this class. | |
342 | 1175 |
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1176 void secondary_free_list_add(FreeRegionList* list) { |
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1177 _secondary_free_list.add_ordered(list); |
2152 | 1178 } |
342 | 1179 |
2152 | 1180 void append_secondary_free_list() { |
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1181 _hrm.insert_list_into_free_list(&_secondary_free_list); |
2152 | 1182 } |
342 | 1183 |
2361 | 1184 void append_secondary_free_list_if_not_empty_with_lock() { |
1185 // If the secondary free list looks empty there's no reason to | |
1186 // take the lock and then try to append it. | |
2152 | 1187 if (!_secondary_free_list.is_empty()) { |
1188 MutexLockerEx x(SecondaryFreeList_lock, Mutex::_no_safepoint_check_flag); | |
1189 append_secondary_free_list(); | |
1190 } | |
1191 } | |
342 | 1192 |
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1193 inline void old_set_remove(HeapRegion* hr); |
4072 | 1194 |
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1195 size_t non_young_capacity_bytes() { |
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1196 return _old_set.total_capacity_bytes() + _humongous_set.total_capacity_bytes(); |
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1197 } |
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1198 |
2152 | 1199 void set_free_regions_coming(); |
1200 void reset_free_regions_coming(); | |
1201 bool free_regions_coming() { return _free_regions_coming; } | |
1202 void wait_while_free_regions_coming(); | |
342 | 1203 |
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1204 // Determine whether the given region is one that we are using as an |
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1205 // old GC alloc region. |
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1206 bool is_old_gc_alloc_region(HeapRegion* hr) { |
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1207 return _allocator->is_retained_old_region(hr); |
4912
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1208 } |
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1209 |
342 | 1210 // Perform a collection of the heap; intended for use in implementing |
1211 // "System.gc". This probably implies as full a collection as the | |
1212 // "CollectedHeap" supports. | |
1213 virtual void collect(GCCause::Cause cause); | |
1214 | |
1215 // The same as above but assume that the caller holds the Heap_lock. | |
1216 void collect_locked(GCCause::Cause cause); | |
1217 | |
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1218 virtual bool copy_allocation_context_stats(const jint* contexts, |
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1219 jlong* totals, |
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1220 jbyte* accuracy, |
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1221 jint len); |
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1222 |
10405 | 1223 // True iff an evacuation has failed in the most-recent collection. |
342 | 1224 bool evacuation_failed() { return _evacuation_failed; } |
1225 | |
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1226 void remove_from_old_sets(const HeapRegionSetCount& old_regions_removed, const HeapRegionSetCount& humongous_regions_removed); |
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1227 void prepend_to_freelist(FreeRegionList* list); |
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1228 void decrement_summary_bytes(size_t bytes); |
342 | 1229 |
4708 | 1230 // Returns "TRUE" iff "p" points into the committed areas of the heap. |
342 | 1231 virtual bool is_in(const void* p) const; |
20337 | 1232 #ifdef ASSERT |
1233 // Returns whether p is in one of the available areas of the heap. Slow but | |
1234 // extensive version. | |
1235 bool is_in_exact(const void* p) const; | |
1236 #endif | |
342 | 1237 |
1238 // Return "TRUE" iff the given object address is within the collection | |
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1239 // set. Slow implementation. |
342 | 1240 inline bool obj_in_cs(oop obj); |
1241 | |
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1242 inline bool is_in_cset(oop obj); |
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1243 |
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1244 inline bool is_in_cset_or_humongous(const oop obj); |
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1245 |
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1246 private: |
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1247 // This array is used for a quick test on whether a reference points into |
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1248 // the collection set or not. Each of the array's elements denotes whether the |
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1249 // corresponding region is in the collection set or not. |
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1250 G1InCSetStateFastTestBiasedMappedArray _in_cset_fast_test; |
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1251 |
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1252 public: |
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1253 |
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1254 inline InCSetState in_cset_state(const oop obj); |
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1255 |
342 | 1256 // Return "TRUE" iff the given object address is in the reserved |
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1257 // region of g1. |
342 | 1258 bool is_in_g1_reserved(const void* p) const { |
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1259 return _hrm.reserved().contains(p); |
342 | 1260 } |
1261 | |
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1262 // Returns a MemRegion that corresponds to the space that has been |
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1263 // reserved for the heap |
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1264 MemRegion g1_reserved() const { |
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1265 return _hrm.reserved(); |
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1266 } |
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1267 |
2311 | 1268 virtual bool is_in_closed_subset(const void* p) const; |
342 | 1269 |
20337 | 1270 G1SATBCardTableLoggingModRefBS* g1_barrier_set() { |
1271 return (G1SATBCardTableLoggingModRefBS*) barrier_set(); | |
12343 | 1272 } |
1273 | |
342 | 1274 // This resets the card table to all zeros. It is used after |
1275 // a collection pause which used the card table to claim cards. | |
1276 void cleanUpCardTable(); | |
1277 | |
1278 // Iteration functions. | |
1279 | |
1280 // Iterate over all the ref-containing fields of all objects, calling | |
1281 // "cl.do_oop" on each. | |
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1282 virtual void oop_iterate(ExtendedOopClosure* cl); |
342 | 1283 |
1284 // Iterate over all objects, calling "cl.do_object" on each. | |
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1285 virtual void object_iterate(ObjectClosure* cl); |
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1286 |
678 | 1287 virtual void safe_object_iterate(ObjectClosure* cl) { |
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1288 object_iterate(cl); |
678 | 1289 } |
342 | 1290 |
1291 // Iterate over all spaces in use in the heap, in ascending address order. | |
1292 virtual void space_iterate(SpaceClosure* cl); | |
1293 | |
1294 // Iterate over heap regions, in address order, terminating the | |
1295 // iteration early if the "doHeapRegion" method returns "true". | |
3766 | 1296 void heap_region_iterate(HeapRegionClosure* blk) const; |
342 | 1297 |
3766 | 1298 // Return the region with the given index. It assumes the index is valid. |
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1299 inline HeapRegion* region_at(uint index) const; |
342 | 1300 |
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1301 // Calculate the region index of the given address. Given address must be |
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1302 // within the heap. |
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1303 inline uint addr_to_region(HeapWord* addr) const; |
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1304 |
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1305 inline HeapWord* bottom_addr_for_region(uint index) const; |
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1306 |
342 | 1307 // Divide the heap region sequence into "chunks" of some size (the number |
1308 // of regions divided by the number of parallel threads times some | |
1309 // overpartition factor, currently 4). Assumes that this will be called | |
1310 // in parallel by ParallelGCThreads worker threads with discinct worker | |
1311 // ids in the range [0..max(ParallelGCThreads-1, 1)], that all parallel | |
1312 // calls will use the same "claim_value", and that that claim value is | |
1313 // different from the claim_value of any heap region before the start of | |
1314 // the iteration. Applies "blk->doHeapRegion" to each of the regions, by | |
1315 // attempting to claim the first region in each chunk, and, if | |
1316 // successful, applying the closure to each region in the chunk (and | |
1317 // setting the claim value of the second and subsequent regions of the | |
1318 // chunk.) For now requires that "doHeapRegion" always returns "false", | |
1319 // i.e., that a closure never attempt to abort a traversal. | |
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1320 void heap_region_par_iterate_chunked(HeapRegionClosure* cl, |
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1321 uint worker_id, |
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1322 uint num_workers, |
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1323 jint claim_value) const; |
342 | 1324 |
390 | 1325 // It resets all the region claim values to the default. |
1326 void reset_heap_region_claim_values(); | |
1327 | |
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1328 // Resets the claim values of regions in the current |
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1329 // collection set to the default. |
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1330 void reset_cset_heap_region_claim_values(); |
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1331 |
355 | 1332 #ifdef ASSERT |
1333 bool check_heap_region_claim_values(jint claim_value); | |
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1334 |
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1335 // Same as the routine above but only checks regions in the |
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1336 // current collection set. |
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1337 bool check_cset_heap_region_claim_values(jint claim_value); |
355 | 1338 #endif // ASSERT |
1339 | |
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1340 // Clear the cached cset start regions and (more importantly) |
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1341 // the time stamps. Called when we reset the GC time stamp. |
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1342 void clear_cset_start_regions(); |
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1343 |
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1344 // Given the id of a worker, obtain or calculate a suitable |
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1345 // starting region for iterating over the current collection set. |
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1346 HeapRegion* start_cset_region_for_worker(uint worker_i); |
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1347 |
342 | 1348 // Iterate over the regions (if any) in the current collection set. |
1349 void collection_set_iterate(HeapRegionClosure* blk); | |
1350 | |
1351 // As above but starting from region r | |
1352 void collection_set_iterate_from(HeapRegion* r, HeapRegionClosure *blk); | |
1353 | |
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1354 HeapRegion* next_compaction_region(const HeapRegion* from) const; |
342 | 1355 |
1356 // A CollectedHeap will contain some number of spaces. This finds the | |
1357 // space containing a given address, or else returns NULL. | |
1358 virtual Space* space_containing(const void* addr) const; | |
1359 | |
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1360 // Returns the HeapRegion that contains addr. addr must not be NULL. |
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1361 template <class T> |
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1362 inline HeapRegion* heap_region_containing_raw(const T addr) const; |
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1363 |
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1364 // Returns the HeapRegion that contains addr. addr must not be NULL. |
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1365 // If addr is within a humongous continues region, it returns its humongous start region. |
3766 | 1366 template <class T> |
1367 inline HeapRegion* heap_region_containing(const T addr) const; | |
342 | 1368 |
1369 // A CollectedHeap is divided into a dense sequence of "blocks"; that is, | |
1370 // each address in the (reserved) heap is a member of exactly | |
1371 // one block. The defining characteristic of a block is that it is | |
1372 // possible to find its size, and thus to progress forward to the next | |
1373 // block. (Blocks may be of different sizes.) Thus, blocks may | |
1374 // represent Java objects, or they might be free blocks in a | |
1375 // free-list-based heap (or subheap), as long as the two kinds are | |
1376 // distinguishable and the size of each is determinable. | |
1377 | |
1378 // Returns the address of the start of the "block" that contains the | |
1379 // address "addr". We say "blocks" instead of "object" since some heaps | |
1380 // may not pack objects densely; a chunk may either be an object or a | |
1381 // non-object. | |
1382 virtual HeapWord* block_start(const void* addr) const; | |
1383 | |
1384 // Requires "addr" to be the start of a chunk, and returns its size. | |
1385 // "addr + size" is required to be the start of a new chunk, or the end | |
1386 // of the active area of the heap. | |
1387 virtual size_t block_size(const HeapWord* addr) const; | |
1388 | |
1389 // Requires "addr" to be the start of a block, and returns "TRUE" iff | |
1390 // the block is an object. | |
1391 virtual bool block_is_obj(const HeapWord* addr) const; | |
1392 | |
1393 // Does this heap support heap inspection? (+PrintClassHistogram) | |
1394 virtual bool supports_heap_inspection() const { return true; } | |
1395 | |
1396 // Section on thread-local allocation buffers (TLABs) | |
1397 // See CollectedHeap for semantics. | |
1398 | |
17727 | 1399 bool supports_tlab_allocation() const; |
1400 size_t tlab_capacity(Thread* ignored) const; | |
1401 size_t tlab_used(Thread* ignored) const; | |
1402 size_t max_tlab_size() const; | |
1403 size_t unsafe_max_tlab_alloc(Thread* ignored) const; | |
342 | 1404 |
1405 // Can a compiler initialize a new object without store barriers? | |
1406 // This permission only extends from the creation of a new object | |
1027
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1407 // via a TLAB up to the first subsequent safepoint. If such permission |
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1408 // is granted for this heap type, the compiler promises to call |
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1409 // defer_store_barrier() below on any slow path allocation of |
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1410 // a new object for which such initializing store barriers will |
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1411 // have been elided. G1, like CMS, allows this, but should be |
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1412 // ready to provide a compensating write barrier as necessary |
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1413 // if that storage came out of a non-young region. The efficiency |
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1414 // of this implementation depends crucially on being able to |
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1415 // answer very efficiently in constant time whether a piece of |
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1416 // storage in the heap comes from a young region or not. |
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1417 // See ReduceInitialCardMarks. |
342 | 1418 virtual bool can_elide_tlab_store_barriers() const { |
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1419 return true; |
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1420 } |
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1421 |
1166 | 1422 virtual bool card_mark_must_follow_store() const { |
1423 return true; | |
1424 } | |
1425 | |
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1426 inline bool is_in_young(const oop obj); |
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1427 |
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1428 #ifdef ASSERT |
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1429 virtual bool is_in_partial_collection(const void* p); |
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1430 #endif |
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1431 |
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1432 virtual bool is_scavengable(const void* addr); |
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1433 |
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1434 // We don't need barriers for initializing stores to objects |
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1435 // in the young gen: for the SATB pre-barrier, there is no |
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1436 // pre-value that needs to be remembered; for the remembered-set |
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1437 // update logging post-barrier, we don't maintain remembered set |
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1438 // information for young gen objects. |
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1439 virtual inline bool can_elide_initializing_store_barrier(oop new_obj); |
342 | 1440 |
1441 // Returns "true" iff the given word_size is "very large". | |
1442 static bool isHumongous(size_t word_size) { | |
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1443 // Note this has to be strictly greater-than as the TLABs |
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1444 // are capped at the humongous thresold and we want to |
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1445 // ensure that we don't try to allocate a TLAB as |
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1446 // humongous and that we don't allocate a humongous |
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1447 // object in a TLAB. |
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1448 return word_size > _humongous_object_threshold_in_words; |
342 | 1449 } |
1450 | |
1451 // Update mod union table with the set of dirty cards. | |
1452 void updateModUnion(); | |
1453 | |
1454 // Set the mod union bits corresponding to the given memRegion. Note | |
1455 // that this is always a safe operation, since it doesn't clear any | |
1456 // bits. | |
1457 void markModUnionRange(MemRegion mr); | |
1458 | |
1459 // Records the fact that a marking phase is no longer in progress. | |
1460 void set_marking_complete() { | |
1461 _mark_in_progress = false; | |
1462 } | |
1463 void set_marking_started() { | |
1464 _mark_in_progress = true; | |
1465 } | |
1466 bool mark_in_progress() { | |
1467 return _mark_in_progress; | |
1468 } | |
1469 | |
1470 // Print the maximum heap capacity. | |
1471 virtual size_t max_capacity() const; | |
1472 | |
1473 virtual jlong millis_since_last_gc(); | |
1474 | |
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1475 |
342 | 1476 // Convenience function to be used in situations where the heap type can be |
1477 // asserted to be this type. | |
1478 static G1CollectedHeap* heap(); | |
1479 | |
1480 void set_region_short_lived_locked(HeapRegion* hr); | |
1481 // add appropriate methods for any other surv rate groups | |
1482 | |
17727 | 1483 YoungList* young_list() const { return _young_list; } |
342 | 1484 |
1485 // debugging | |
1486 bool check_young_list_well_formed() { | |
1487 return _young_list->check_list_well_formed(); | |
1488 } | |
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1489 |
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1490 bool check_young_list_empty(bool check_heap, |
342 | 1491 bool check_sample = true); |
1492 | |
1493 // *** Stuff related to concurrent marking. It's not clear to me that so | |
1494 // many of these need to be public. | |
1495 | |
1496 // The functions below are helper functions that a subclass of | |
1497 // "CollectedHeap" can use in the implementation of its virtual | |
1498 // functions. | |
1499 // This performs a concurrent marking of the live objects in a | |
1500 // bitmap off to the side. | |
1501 void doConcurrentMark(); | |
1502 | |
1503 bool isMarkedPrev(oop obj) const; | |
1504 bool isMarkedNext(oop obj) const; | |
1505 | |
1506 // Determine if an object is dead, given the object and also | |
1507 // the region to which the object belongs. An object is dead | |
1508 // iff a) it was not allocated since the last mark and b) it | |
1509 // is not marked. | |
1510 bool is_obj_dead(const oop obj, const HeapRegion* hr) const { | |
1511 return | |
1512 !hr->obj_allocated_since_prev_marking(obj) && | |
1513 !isMarkedPrev(obj); | |
1514 } | |
1515 | |
1516 // This function returns true when an object has been | |
1517 // around since the previous marking and hasn't yet | |
1518 // been marked during this marking. | |
1519 bool is_obj_ill(const oop obj, const HeapRegion* hr) const { | |
1520 return | |
1521 !hr->obj_allocated_since_next_marking(obj) && | |
1522 !isMarkedNext(obj); | |
1523 } | |
1524 | |
1525 // Determine if an object is dead, given only the object itself. | |
1526 // This will find the region to which the object belongs and | |
1527 // then call the region version of the same function. | |
1528 | |
1529 // Added if it is NULL it isn't dead. | |
1530 | |
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1531 inline bool is_obj_dead(const oop obj) const; |
342 | 1532 |
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1533 inline bool is_obj_ill(const oop obj) const; |
342 | 1534 |
12080 | 1535 bool allocated_since_marking(oop obj, HeapRegion* hr, VerifyOption vo); |
1536 HeapWord* top_at_mark_start(HeapRegion* hr, VerifyOption vo); | |
1537 bool is_marked(oop obj, VerifyOption vo); | |
1538 const char* top_at_mark_start_str(VerifyOption vo); | |
1539 | |
1540 ConcurrentMark* concurrent_mark() const { return _cm; } | |
1541 | |
1542 // Refinement | |
1543 | |
1544 ConcurrentG1Refine* concurrent_g1_refine() const { return _cg1r; } | |
1545 | |
1546 // The dirty cards region list is used to record a subset of regions | |
1547 // whose cards need clearing. The list if populated during the | |
1548 // remembered set scanning and drained during the card table | |
1549 // cleanup. Although the methods are reentrant, population/draining | |
1550 // phases must not overlap. For synchronization purposes the last | |
1551 // element on the list points to itself. | |
1552 HeapRegion* _dirty_cards_region_list; | |
1553 void push_dirty_cards_region(HeapRegion* hr); | |
1554 HeapRegion* pop_dirty_cards_region(); | |
1555 | |
1556 // Optimized nmethod scanning support routines | |
1557 | |
1558 // Register the given nmethod with the G1 heap | |
1559 virtual void register_nmethod(nmethod* nm); | |
1560 | |
1561 // Unregister the given nmethod from the G1 heap | |
1562 virtual void unregister_nmethod(nmethod* nm); | |
1563 | |
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1564 // Free up superfluous code root memory. |
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1565 void purge_code_root_memory(); |
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1566 |
12080 | 1567 // Rebuild the stong code root lists for each region |
1568 // after a full GC | |
1569 void rebuild_strong_code_roots(); | |
1570 | |
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1571 // Delete entries for dead interned string and clean up unreferenced symbols |
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1572 // in symbol table, possibly in parallel. |
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1573 void unlink_string_and_symbol_table(BoolObjectClosure* is_alive, bool unlink_strings = true, bool unlink_symbols = true); |
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1574 |
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1575 // Parallel phase of unloading/cleaning after G1 concurrent mark. |
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1576 void parallel_cleaning(BoolObjectClosure* is_alive, bool process_strings, bool process_symbols, bool class_unloading_occurred); |
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1577 |
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1578 // Redirty logged cards in the refinement queue. |
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1579 void redirty_logged_cards(); |
12080 | 1580 // Verification |
1581 | |
1582 // The following is just to alert the verification code | |
1583 // that a full collection has occurred and that the | |
1584 // remembered sets are no longer up to date. | |
1585 bool _full_collection; | |
1586 void set_full_collection() { _full_collection = true;} | |
1587 void clear_full_collection() {_full_collection = false;} | |
1588 bool full_collection() {return _full_collection;} | |
1589 | |
1590 // Perform any cleanup actions necessary before allowing a verification. | |
1591 virtual void prepare_for_verify(); | |
1592 | |
1593 // Perform verification. | |
1594 | |
1595 // vo == UsePrevMarking -> use "prev" marking information, | |
1596 // vo == UseNextMarking -> use "next" marking information | |
1597 // vo == UseMarkWord -> use the mark word in the object header | |
1598 // | |
1599 // NOTE: Only the "prev" marking information is guaranteed to be | |
1600 // consistent most of the time, so most calls to this should use | |
1601 // vo == UsePrevMarking. | |
1602 // Currently, there is only one case where this is called with | |
1603 // vo == UseNextMarking, which is to verify the "next" marking | |
1604 // information at the end of remark. | |
1605 // Currently there is only one place where this is called with | |
1606 // vo == UseMarkWord, which is to verify the marking during a | |
1607 // full GC. | |
1608 void verify(bool silent, VerifyOption vo); | |
1609 | |
1610 // Override; it uses the "prev" marking information | |
1611 virtual void verify(bool silent); | |
1612 | |
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1613 // The methods below are here for convenience and dispatch the |
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1614 // appropriate method depending on value of the given VerifyOption |
12080 | 1615 // parameter. The values for that parameter, and their meanings, |
1616 // are the same as those above. | |
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1617 |
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1618 bool is_obj_dead_cond(const oop obj, |
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1619 const HeapRegion* hr, |
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1620 const VerifyOption vo) const; |
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1621 |
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1622 bool is_obj_dead_cond(const oop obj, |
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1623 const VerifyOption vo) const; |
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1624 |
12080 | 1625 // Printing |
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1626 |
12080 | 1627 virtual void print_on(outputStream* st) const; |
1628 virtual void print_extended_on(outputStream* st) const; | |
1629 virtual void print_on_error(outputStream* st) const; | |
342 | 1630 |
12080 | 1631 virtual void print_gc_threads_on(outputStream* st) const; |
1632 virtual void gc_threads_do(ThreadClosure* tc) const; | |
342 | 1633 |
12080 | 1634 // Override |
1635 void print_tracing_info() const; | |
1636 | |
1637 // The following two methods are helpful for debugging RSet issues. | |
1638 void print_cset_rsets() PRODUCT_RETURN; | |
1639 void print_all_rsets() PRODUCT_RETURN; | |
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1640 |
342 | 1641 public: |
1642 size_t pending_card_num(); | |
1643 size_t cards_scanned(); | |
1644 | |
1645 protected: | |
1646 size_t _max_heap_capacity; | |
1647 }; | |
1648 | |
1972 | 1649 #endif // SHARE_VM_GC_IMPLEMENTATION_G1_G1COLLECTEDHEAP_HPP |