Mercurial > hg > truffle
annotate src/share/vm/gc_implementation/g1/g1CollectedHeap.hpp @ 21645:7eb156f30b61
Merge.
author | Thomas Wuerthinger <thomas.wuerthinger@oracle.com> |
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date | Mon, 01 Jun 2015 22:13:10 +0200 |
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342 | 1 /* |
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2 * Copyright (c) 2001, 2014, Oracle and/or its affiliates. All rights reserved. |
342 | 3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
4 * | |
5 * This code is free software; you can redistribute it and/or modify it | |
6 * under the terms of the GNU General Public License version 2 only, as | |
7 * published by the Free Software Foundation. | |
8 * | |
9 * This code is distributed in the hope that it will be useful, but WITHOUT | |
10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or | |
11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License | |
12 * version 2 for more details (a copy is included in the LICENSE file that | |
13 * accompanied this code). | |
14 * | |
15 * You should have received a copy of the GNU General Public License version | |
16 * 2 along with this work; if not, write to the Free Software Foundation, | |
17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. | |
18 * | |
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19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
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20 * or visit www.oracle.com if you need additional information or have any |
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21 * questions. |
342 | 22 * |
23 */ | |
24 | |
1972 | 25 #ifndef SHARE_VM_GC_IMPLEMENTATION_G1_G1COLLECTEDHEAP_HPP |
26 #define SHARE_VM_GC_IMPLEMENTATION_G1_G1COLLECTEDHEAP_HPP | |
27 | |
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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" |
10405 | 35 #include "gc_implementation/g1/g1MonitoringSupport.hpp" |
12343 | 36 #include "gc_implementation/g1/g1SATBCardTableModRefBS.hpp" |
10405 | 37 #include "gc_implementation/g1/g1YCTypes.hpp" |
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38 #include "gc_implementation/g1/heapRegionManager.hpp" |
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39 #include "gc_implementation/g1/heapRegionSet.hpp" |
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40 #include "gc_implementation/shared/hSpaceCounters.hpp" |
6595 | 41 #include "gc_implementation/shared/parGCAllocBuffer.hpp" |
1972 | 42 #include "memory/barrierSet.hpp" |
43 #include "memory/memRegion.hpp" | |
44 #include "memory/sharedHeap.hpp" | |
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45 #include "utilities/stack.hpp" |
1972 | 46 |
342 | 47 // A "G1CollectedHeap" is an implementation of a java heap for HotSpot. |
48 // It uses the "Garbage First" heap organization and algorithm, which | |
49 // may combine concurrent marking with parallel, incremental compaction of | |
50 // heap subsets that will yield large amounts of garbage. | |
51 | |
12080 | 52 // Forward declarations |
342 | 53 class HeapRegion; |
2173 | 54 class HRRSCleanupTask; |
342 | 55 class GenerationSpec; |
56 class OopsInHeapRegionClosure; | |
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57 class G1KlassScanClosure; |
342 | 58 class G1ScanHeapEvacClosure; |
59 class ObjectClosure; | |
60 class SpaceClosure; | |
61 class CompactibleSpaceClosure; | |
62 class Space; | |
63 class G1CollectorPolicy; | |
64 class GenRemSet; | |
65 class G1RemSet; | |
66 class HeapRegionRemSetIterator; | |
67 class ConcurrentMark; | |
68 class ConcurrentMarkThread; | |
69 class ConcurrentG1Refine; | |
10405 | 70 class ConcurrentGCTimer; |
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71 class GenerationCounters; |
10405 | 72 class STWGCTimer; |
73 class G1NewTracer; | |
74 class G1OldTracer; | |
75 class EvacuationFailedInfo; | |
12080 | 76 class nmethod; |
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77 class Ticks; |
342 | 78 |
6197 | 79 typedef OverflowTaskQueue<StarTask, mtGC> RefToScanQueue; |
80 typedef GenericTaskQueueSet<RefToScanQueue, mtGC> RefToScanQueueSet; | |
342 | 81 |
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82 typedef int RegionIdx_t; // needs to hold [ 0..max_regions() ) |
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83 typedef int CardIdx_t; // needs to hold [ 0..CardsPerRegion ) |
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84 |
6197 | 85 class YoungList : public CHeapObj<mtGC> { |
342 | 86 private: |
87 G1CollectedHeap* _g1h; | |
88 | |
89 HeapRegion* _head; | |
90 | |
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91 HeapRegion* _survivor_head; |
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92 HeapRegion* _survivor_tail; |
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93 |
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94 HeapRegion* _curr; |
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95 |
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96 uint _length; |
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97 uint _survivor_length; |
342 | 98 |
99 size_t _last_sampled_rs_lengths; | |
100 size_t _sampled_rs_lengths; | |
101 | |
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102 void empty_list(HeapRegion* list); |
342 | 103 |
104 public: | |
105 YoungList(G1CollectedHeap* g1h); | |
106 | |
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107 void push_region(HeapRegion* hr); |
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108 void add_survivor_region(HeapRegion* hr); |
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109 |
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110 void empty_list(); |
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111 bool is_empty() { return _length == 0; } |
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112 uint length() { return _length; } |
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113 uint survivor_length() { return _survivor_length; } |
342 | 114 |
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115 // Currently we do not keep track of the used byte sum for the |
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116 // young list and the survivors and it'd be quite a lot of work to |
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117 // do so. When we'll eventually replace the young list with |
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118 // instances of HeapRegionLinkedList we'll get that for free. So, |
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119 // we'll report the more accurate information then. |
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120 size_t eden_used_bytes() { |
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121 assert(length() >= survivor_length(), "invariant"); |
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122 return (size_t) (length() - survivor_length()) * HeapRegion::GrainBytes; |
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123 } |
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124 size_t survivor_used_bytes() { |
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125 return (size_t) survivor_length() * HeapRegion::GrainBytes; |
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126 } |
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127 |
342 | 128 void rs_length_sampling_init(); |
129 bool rs_length_sampling_more(); | |
130 void rs_length_sampling_next(); | |
131 | |
132 void reset_sampled_info() { | |
133 _last_sampled_rs_lengths = 0; | |
134 } | |
135 size_t sampled_rs_lengths() { return _last_sampled_rs_lengths; } | |
136 | |
137 // for development purposes | |
138 void reset_auxilary_lists(); | |
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139 void clear() { _head = NULL; _length = 0; } |
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140 |
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141 void clear_survivors() { |
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142 _survivor_head = NULL; |
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143 _survivor_tail = NULL; |
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144 _survivor_length = 0; |
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145 } |
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146 |
342 | 147 HeapRegion* first_region() { return _head; } |
148 HeapRegion* first_survivor_region() { return _survivor_head; } | |
545 | 149 HeapRegion* last_survivor_region() { return _survivor_tail; } |
342 | 150 |
151 // debugging | |
152 bool check_list_well_formed(); | |
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153 bool check_list_empty(bool check_sample = true); |
342 | 154 void print(); |
155 }; | |
156 | |
12080 | 157 // The G1 STW is alive closure. |
158 // An instance is embedded into the G1CH and used as the | |
159 // (optional) _is_alive_non_header closure in the STW | |
160 // reference processor. It is also extensively used during | |
161 // reference processing during STW evacuation pauses. | |
162 class G1STWIsAliveClosure: public BoolObjectClosure { | |
163 G1CollectedHeap* _g1; | |
164 public: | |
165 G1STWIsAliveClosure(G1CollectedHeap* g1) : _g1(g1) {} | |
166 bool do_object_b(oop p); | |
167 }; | |
168 | |
342 | 169 class RefineCardTableEntryClosure; |
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170 |
20337 | 171 class G1RegionMappingChangedListener : public G1MappingChangedListener { |
172 private: | |
173 void reset_from_card_cache(uint start_idx, size_t num_regions); | |
174 public: | |
20543 | 175 virtual void on_commit(uint start_idx, size_t num_regions, bool zero_filled); |
20337 | 176 }; |
177 | |
342 | 178 class G1CollectedHeap : public SharedHeap { |
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179 friend class VM_CollectForMetadataAllocation; |
342 | 180 friend class VM_G1CollectForAllocation; |
181 friend class VM_G1CollectFull; | |
182 friend class VM_G1IncCollectionPause; | |
183 friend class VMStructs; | |
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184 friend class MutatorAllocRegion; |
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185 friend class SurvivorGCAllocRegion; |
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186 friend class OldGCAllocRegion; |
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187 friend class G1Allocator; |
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188 friend class G1DefaultAllocator; |
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189 friend class G1ResManAllocator; |
342 | 190 |
191 // Closures used in implementation. | |
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192 template <G1Barrier barrier, G1Mark do_mark_object> |
5987 | 193 friend class G1ParCopyClosure; |
342 | 194 friend class G1IsAliveClosure; |
195 friend class G1EvacuateFollowersClosure; | |
196 friend class G1ParScanThreadState; | |
197 friend class G1ParScanClosureSuper; | |
198 friend class G1ParEvacuateFollowersClosure; | |
199 friend class G1ParTask; | |
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200 friend class G1ParGCAllocator; |
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201 friend class G1DefaultParGCAllocator; |
342 | 202 friend class G1FreeGarbageRegionClosure; |
203 friend class RefineCardTableEntryClosure; | |
204 friend class G1PrepareCompactClosure; | |
205 friend class RegionSorter; | |
2152 | 206 friend class RegionResetter; |
342 | 207 friend class CountRCClosure; |
208 friend class EvacPopObjClosure; | |
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209 friend class G1ParCleanupCTTask; |
342 | 210 |
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211 friend class G1FreeHumongousRegionClosure; |
342 | 212 // Other related classes. |
213 friend class G1MarkSweep; | |
214 | |
215 private: | |
216 // The one and only G1CollectedHeap, so static functions can find it. | |
217 static G1CollectedHeap* _g1h; | |
218 | |
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219 static size_t _humongous_object_threshold_in_words; |
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220 |
2152 | 221 // The secondary free list which contains regions that have been |
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222 // freed up during the cleanup process. This will be appended to |
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223 // the master free list when appropriate. |
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224 FreeRegionList _secondary_free_list; |
2152 | 225 |
4072 | 226 // It keeps track of the old regions. |
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227 HeapRegionSet _old_set; |
4072 | 228 |
2152 | 229 // It keeps track of the humongous regions. |
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230 HeapRegionSet _humongous_set; |
342 | 231 |
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232 void clear_humongous_is_live_table(); |
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233 void eagerly_reclaim_humongous_regions(); |
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234 |
342 | 235 // The number of regions we could create by expansion. |
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236 uint _expansion_regions; |
342 | 237 |
238 // The block offset table for the G1 heap. | |
239 G1BlockOffsetSharedArray* _bot_shared; | |
240 | |
4072 | 241 // Tears down the region sets / lists so that they are empty and the |
242 // regions on the heap do not belong to a region set / list. The | |
243 // only exception is the humongous set which we leave unaltered. If | |
244 // free_list_only is true, it will only tear down the master free | |
245 // list. It is called before a Full GC (free_list_only == false) or | |
246 // before heap shrinking (free_list_only == true). | |
247 void tear_down_region_sets(bool free_list_only); | |
248 | |
249 // Rebuilds the region sets / lists so that they are repopulated to | |
250 // reflect the contents of the heap. The only exception is the | |
251 // humongous set which was not torn down in the first place. If | |
252 // free_list_only is true, it will only rebuild the master free | |
253 // list. It is called after a Full GC (free_list_only == false) or | |
254 // after heap shrinking (free_list_only == true). | |
255 void rebuild_region_sets(bool free_list_only); | |
342 | 256 |
20337 | 257 // Callback for region mapping changed events. |
258 G1RegionMappingChangedListener _listener; | |
259 | |
342 | 260 // The sequence of all heap regions in the heap. |
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261 HeapRegionManager _hrm; |
342 | 262 |
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263 // Class that handles the different kinds of allocations. |
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264 G1Allocator* _allocator; |
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265 |
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266 // Statistics for each allocation context |
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267 AllocationContextStats _allocation_context_stats; |
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268 |
6595 | 269 // PLAB sizing policy for survivors. |
270 PLABStats _survivor_plab_stats; | |
271 | |
272 // PLAB sizing policy for tenured objects. | |
273 PLABStats _old_plab_stats; | |
274 | |
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275 // It specifies whether we should attempt to expand the heap after a |
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276 // region allocation failure. If heap expansion fails we set this to |
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277 // false so that we don't re-attempt the heap expansion (it's likely |
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278 // that subsequent expansion attempts will also fail if one fails). |
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279 // Currently, it is only consulted during GC and it's reset at the |
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280 // start of each GC. |
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281 bool _expand_heap_after_alloc_failure; |
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282 |
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283 // It resets the mutator alloc region before new allocations can take place. |
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284 void init_mutator_alloc_region(); |
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285 |
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286 // It releases the mutator alloc region. |
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287 void release_mutator_alloc_region(); |
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288 |
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289 // It initializes the GC alloc regions at the start of a GC. |
10405 | 290 void init_gc_alloc_regions(EvacuationInfo& evacuation_info); |
342 | 291 |
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292 // It releases the GC alloc regions at the end of a GC. |
10405 | 293 void release_gc_alloc_regions(uint no_of_gc_workers, EvacuationInfo& evacuation_info); |
342 | 294 |
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295 // It does any cleanup that needs to be done on the GC alloc regions |
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296 // before a Full GC. |
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297 void abandon_gc_alloc_regions(); |
342 | 298 |
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299 // Helper for monitoring and management support. |
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300 G1MonitoringSupport* _g1mm; |
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301 |
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302 // Records whether the region at the given index is kept live by roots or |
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303 // references from the young generation. |
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304 class HumongousIsLiveBiasedMappedArray : public G1BiasedMappedArray<bool> { |
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305 protected: |
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306 bool default_value() const { return false; } |
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307 public: |
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308 void clear() { G1BiasedMappedArray<bool>::clear(); } |
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309 void set_live(uint region) { |
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310 set_by_index(region, true); |
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311 } |
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312 bool is_live(uint region) { |
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313 return get_by_index(region); |
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314 } |
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315 }; |
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316 |
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317 HumongousIsLiveBiasedMappedArray _humongous_is_live; |
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318 // Stores whether during humongous object registration we found candidate regions. |
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319 // If not, we can skip a few steps. |
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320 bool _has_humongous_reclaim_candidates; |
526 | 321 |
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322 volatile unsigned _gc_time_stamp; |
342 | 323 |
324 size_t* _surviving_young_words; | |
325 | |
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326 G1HRPrinter _hr_printer; |
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327 |
342 | 328 void setup_surviving_young_words(); |
329 void update_surviving_young_words(size_t* surv_young_words); | |
330 void cleanup_surviving_young_words(); | |
331 | |
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332 // It decides whether an explicit GC should start a concurrent cycle |
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333 // instead of doing a STW GC. Currently, a concurrent cycle is |
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334 // explicitly started if: |
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335 // (a) cause == _gc_locker and +GCLockerInvokesConcurrent, or |
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336 // (b) cause == _java_lang_system_gc and +ExplicitGCInvokesConcurrent. |
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337 // (c) cause == _g1_humongous_allocation |
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338 bool should_do_concurrent_full_gc(GCCause::Cause cause); |
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339 |
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340 // Keeps track of how many "old marking cycles" (i.e., Full GCs or |
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341 // concurrent cycles) we have started. |
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342 volatile unsigned int _old_marking_cycles_started; |
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343 |
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344 // Keeps track of how many "old marking cycles" (i.e., Full GCs or |
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345 // concurrent cycles) we have completed. |
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346 volatile unsigned int _old_marking_cycles_completed; |
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347 |
10405 | 348 bool _concurrent_cycle_started; |
349 | |
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350 // This is a non-product method that is helpful for testing. It is |
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351 // called at the end of a GC and artificially expands the heap by |
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352 // allocating a number of dead regions. This way we can induce very |
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353 // frequent marking cycles and stress the cleanup / concurrent |
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354 // cleanup code more (as all the regions that will be allocated by |
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355 // this method will be found dead by the marking cycle). |
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356 void allocate_dummy_regions() PRODUCT_RETURN; |
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357 |
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358 // Clear RSets after a compaction. It also resets the GC time stamps. |
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359 void clear_rsets_post_compaction(); |
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360 |
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361 // If the HR printer is active, dump the state of the regions in the |
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362 // heap after a compaction. |
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363 void print_hrm_post_compaction(); |
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364 |
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365 double verify(bool guard, const char* msg); |
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366 void verify_before_gc(); |
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367 void verify_after_gc(); |
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368 |
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369 void log_gc_header(); |
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370 void log_gc_footer(double pause_time_sec); |
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371 |
1973 | 372 // These are macros so that, if the assert fires, we get the correct |
373 // line number, file, etc. | |
374 | |
2361 | 375 #define heap_locking_asserts_err_msg(_extra_message_) \ |
2152 | 376 err_msg("%s : Heap_lock locked: %s, at safepoint: %s, is VM thread: %s", \ |
2361 | 377 (_extra_message_), \ |
2152 | 378 BOOL_TO_STR(Heap_lock->owned_by_self()), \ |
379 BOOL_TO_STR(SafepointSynchronize::is_at_safepoint()), \ | |
380 BOOL_TO_STR(Thread::current()->is_VM_thread())) | |
1973 | 381 |
382 #define assert_heap_locked() \ | |
383 do { \ | |
384 assert(Heap_lock->owned_by_self(), \ | |
385 heap_locking_asserts_err_msg("should be holding the Heap_lock")); \ | |
386 } while (0) | |
387 | |
2361 | 388 #define assert_heap_locked_or_at_safepoint(_should_be_vm_thread_) \ |
1973 | 389 do { \ |
390 assert(Heap_lock->owned_by_self() || \ | |
2152 | 391 (SafepointSynchronize::is_at_safepoint() && \ |
2361 | 392 ((_should_be_vm_thread_) == Thread::current()->is_VM_thread())), \ |
1973 | 393 heap_locking_asserts_err_msg("should be holding the Heap_lock or " \ |
394 "should be at a safepoint")); \ | |
395 } while (0) | |
396 | |
397 #define assert_heap_locked_and_not_at_safepoint() \ | |
398 do { \ | |
399 assert(Heap_lock->owned_by_self() && \ | |
400 !SafepointSynchronize::is_at_safepoint(), \ | |
401 heap_locking_asserts_err_msg("should be holding the Heap_lock and " \ | |
402 "should not be at a safepoint")); \ | |
403 } while (0) | |
404 | |
405 #define assert_heap_not_locked() \ | |
406 do { \ | |
407 assert(!Heap_lock->owned_by_self(), \ | |
408 heap_locking_asserts_err_msg("should not be holding the Heap_lock")); \ | |
409 } while (0) | |
410 | |
411 #define assert_heap_not_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 not be holding the Heap_lock and " \ | |
416 "should not be at a safepoint")); \ | |
417 } while (0) | |
418 | |
2361 | 419 #define assert_at_safepoint(_should_be_vm_thread_) \ |
1973 | 420 do { \ |
2152 | 421 assert(SafepointSynchronize::is_at_safepoint() && \ |
2361 | 422 ((_should_be_vm_thread_) == Thread::current()->is_VM_thread()), \ |
1973 | 423 heap_locking_asserts_err_msg("should be at a safepoint")); \ |
424 } while (0) | |
425 | |
426 #define assert_not_at_safepoint() \ | |
427 do { \ | |
428 assert(!SafepointSynchronize::is_at_safepoint(), \ | |
429 heap_locking_asserts_err_msg("should not be at a safepoint")); \ | |
430 } while (0) | |
431 | |
342 | 432 protected: |
433 | |
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434 // The young region list. |
342 | 435 YoungList* _young_list; |
436 | |
437 // The current policy object for the collector. | |
438 G1CollectorPolicy* _g1_policy; | |
439 | |
2152 | 440 // This is the second level of trying to allocate a new region. If |
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441 // new_region() didn't find a region on the free_list, this call will |
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442 // check whether there's anything available on the |
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443 // secondary_free_list and/or wait for more regions to appear on |
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444 // that list, if _free_regions_coming is set. |
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445 HeapRegion* new_region_try_secondary_free_list(bool is_old); |
342 | 446 |
2361 | 447 // Try to allocate a single non-humongous HeapRegion sufficient for |
448 // an allocation of the given word_size. If do_expand is true, | |
449 // attempt to expand the heap if necessary to satisfy the allocation | |
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450 // request. If the region is to be used as an old region or for a |
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451 // humongous object, set is_old to true. If not, to false. |
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452 HeapRegion* new_region(size_t word_size, bool is_old, bool do_expand); |
342 | 453 |
2361 | 454 // Initialize a contiguous set of free regions of length num_regions |
455 // and starting at index first so that they appear as a single | |
456 // humongous region. | |
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457 HeapWord* humongous_obj_allocate_initialize_regions(uint first, |
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458 uint num_regions, |
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459 size_t word_size, |
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460 AllocationContext_t context); |
2361 | 461 |
462 // Attempt to allocate a humongous object of the given size. Return | |
463 // NULL if unsuccessful. | |
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464 HeapWord* humongous_obj_allocate(size_t word_size, AllocationContext_t context); |
1973 | 465 |
466 // The following two methods, allocate_new_tlab() and | |
467 // mem_allocate(), are the two main entry points from the runtime | |
468 // into the G1's allocation routines. They have the following | |
469 // assumptions: | |
470 // | |
471 // * They should both be called outside safepoints. | |
472 // | |
473 // * They should both be called without holding the Heap_lock. | |
474 // | |
475 // * All allocation requests for new TLABs should go to | |
476 // allocate_new_tlab(). | |
477 // | |
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478 // * All non-TLAB allocation requests should go to mem_allocate(). |
1973 | 479 // |
480 // * If either call cannot satisfy the allocation request using the | |
481 // current allocating region, they will try to get a new one. If | |
482 // this fails, they will attempt to do an evacuation pause and | |
483 // retry the allocation. | |
484 // | |
485 // * If all allocation attempts fail, even after trying to schedule | |
486 // an evacuation pause, allocate_new_tlab() will return NULL, | |
487 // whereas mem_allocate() will attempt a heap expansion and/or | |
488 // schedule a Full GC. | |
489 // | |
490 // * We do not allow humongous-sized TLABs. So, allocate_new_tlab | |
491 // should never be called with word_size being humongous. All | |
492 // humongous allocation requests should go to mem_allocate() which | |
493 // will satisfy them with a special path. | |
494 | |
495 virtual HeapWord* allocate_new_tlab(size_t word_size); | |
496 | |
497 virtual HeapWord* mem_allocate(size_t word_size, | |
498 bool* gc_overhead_limit_was_exceeded); | |
342 | 499 |
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500 // The following three methods take a gc_count_before_ret |
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501 // parameter which is used to return the GC count if the method |
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502 // returns NULL. Given that we are required to read the GC count |
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503 // while holding the Heap_lock, and these paths will take the |
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504 // Heap_lock at some point, it's easier to get them to read the GC |
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505 // count while holding the Heap_lock before they return NULL instead |
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506 // of the caller (namely: mem_allocate()) having to also take the |
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507 // Heap_lock just to read the GC count. |
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508 |
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509 // First-level mutator allocation attempt: try to allocate out of |
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510 // the mutator alloc region without taking the Heap_lock. This |
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511 // should only be used for non-humongous allocations. |
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512 inline HeapWord* attempt_allocation(size_t word_size, |
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513 unsigned int* gc_count_before_ret, |
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514 int* gclocker_retry_count_ret); |
342 | 515 |
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516 // Second-level mutator allocation attempt: take the Heap_lock and |
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517 // retry the allocation attempt, potentially scheduling a GC |
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518 // pause. This should only be used for non-humongous allocations. |
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519 HeapWord* attempt_allocation_slow(size_t word_size, |
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520 AllocationContext_t context, |
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521 unsigned int* gc_count_before_ret, |
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522 int* gclocker_retry_count_ret); |
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523 |
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524 // Takes the Heap_lock and attempts a humongous allocation. It can |
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525 // potentially schedule a GC pause. |
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526 HeapWord* attempt_allocation_humongous(size_t word_size, |
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527 unsigned int* gc_count_before_ret, |
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528 int* gclocker_retry_count_ret); |
1973 | 529 |
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530 // Allocation attempt that should be called during safepoints (e.g., |
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531 // at the end of a successful GC). expect_null_mutator_alloc_region |
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532 // specifies whether the mutator alloc region is expected to be NULL |
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533 // or not. |
1973 | 534 HeapWord* attempt_allocation_at_safepoint(size_t word_size, |
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535 AllocationContext_t context, |
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536 bool expect_null_mutator_alloc_region); |
1973 | 537 |
538 // It dirties the cards that cover the block so that so that the post | |
539 // write barrier never queues anything when updating objects on this | |
540 // block. It is assumed (and in fact we assert) that the block | |
541 // belongs to a young region. | |
542 inline void dirty_young_block(HeapWord* start, size_t word_size); | |
342 | 543 |
544 // Allocate blocks during garbage collection. Will ensure an | |
545 // allocation region, either by picking one or expanding the | |
546 // heap, and then allocate a block of the given size. The block | |
547 // may not be a humongous - it must fit into a single heap region. | |
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548 HeapWord* par_allocate_during_gc(GCAllocPurpose purpose, |
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549 size_t word_size, |
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550 AllocationContext_t context); |
342 | 551 |
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552 HeapWord* allocate_during_gc_slow(GCAllocPurpose purpose, |
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553 HeapRegion* alloc_region, |
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554 bool par, |
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555 size_t word_size); |
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556 |
342 | 557 // Ensure that no further allocations can happen in "r", bearing in mind |
558 // that parallel threads might be attempting allocations. | |
559 void par_allocate_remaining_space(HeapRegion* r); | |
560 | |
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561 // Allocation attempt during GC for a survivor object / PLAB. |
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562 inline HeapWord* survivor_attempt_allocation(size_t word_size, |
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563 AllocationContext_t context); |
545 | 564 |
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565 // Allocation attempt during GC for an old object / PLAB. |
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566 inline HeapWord* old_attempt_allocation(size_t word_size, |
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567 AllocationContext_t context); |
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568 |
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569 // These methods are the "callbacks" from the G1AllocRegion class. |
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570 |
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571 // For mutator alloc regions. |
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572 HeapRegion* new_mutator_alloc_region(size_t word_size, bool force); |
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573 void retire_mutator_alloc_region(HeapRegion* alloc_region, |
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574 size_t allocated_bytes); |
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575 |
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576 // For GC alloc regions. |
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577 HeapRegion* new_gc_alloc_region(size_t word_size, uint count, |
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578 GCAllocPurpose ap); |
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579 void retire_gc_alloc_region(HeapRegion* alloc_region, |
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580 size_t allocated_bytes, GCAllocPurpose ap); |
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581 |
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582 // - if explicit_gc is true, the GC is for a System.gc() or a heap |
1973 | 583 // inspection request and should collect the entire heap |
584 // - if clear_all_soft_refs is true, all soft references should be | |
585 // cleared during the GC | |
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586 // - if explicit_gc is false, word_size describes the allocation that |
1973 | 587 // the GC should attempt (at least) to satisfy |
588 // - it returns false if it is unable to do the collection due to the | |
589 // GC locker being active, true otherwise | |
590 bool do_collection(bool explicit_gc, | |
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591 bool clear_all_soft_refs, |
342 | 592 size_t word_size); |
593 | |
594 // Callback from VM_G1CollectFull operation. | |
595 // Perform a full collection. | |
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596 virtual void do_full_collection(bool clear_all_soft_refs); |
342 | 597 |
598 // Resize the heap if necessary after a full collection. If this is | |
599 // after a collect-for allocation, "word_size" is the allocation size, | |
600 // and will be considered part of the used portion of the heap. | |
601 void resize_if_necessary_after_full_collection(size_t word_size); | |
602 | |
603 // Callback from VM_G1CollectForAllocation operation. | |
604 // This function does everything necessary/possible to satisfy a | |
605 // failed allocation request (including collection, expansion, etc.) | |
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606 HeapWord* satisfy_failed_allocation(size_t word_size, |
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607 AllocationContext_t context, |
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608 bool* succeeded); |
342 | 609 |
610 // Attempting to expand the heap sufficiently | |
611 // to support an allocation of the given "word_size". If | |
612 // successful, perform the allocation and return the address of the | |
613 // allocated block, or else "NULL". | |
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614 HeapWord* expand_and_allocate(size_t word_size, AllocationContext_t context); |
342 | 615 |
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616 // Process any reference objects discovered during |
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617 // an incremental evacuation pause. |
6819 | 618 void process_discovered_references(uint no_of_gc_workers); |
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619 |
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620 // Enqueue any remaining discovered references |
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621 // after processing. |
6819 | 622 void enqueue_discovered_references(uint no_of_gc_workers); |
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623 |
342 | 624 public: |
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625 |
20417 | 626 G1Allocator* allocator() { |
627 return _allocator; | |
628 } | |
629 | |
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630 G1MonitoringSupport* g1mm() { |
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631 assert(_g1mm != NULL, "should have been initialized"); |
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632 return _g1mm; |
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633 } |
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634 |
342 | 635 // Expand the garbage-first heap by at least the given size (in bytes!). |
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636 // Returns true if the heap was expanded by the requested amount; |
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637 // false otherwise. |
342 | 638 // (Rounds up to a HeapRegion boundary.) |
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639 bool expand(size_t expand_bytes); |
342 | 640 |
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641 // Returns the PLAB statistics given a purpose. |
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642 PLABStats* stats_for_purpose(GCAllocPurpose purpose) { |
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643 PLABStats* stats = NULL; |
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644 |
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645 switch (purpose) { |
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646 case GCAllocForSurvived: |
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647 stats = &_survivor_plab_stats; |
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648 break; |
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649 case GCAllocForTenured: |
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650 stats = &_old_plab_stats; |
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651 break; |
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652 default: |
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653 assert(false, "unrecognized GCAllocPurpose"); |
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654 } |
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655 |
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656 return stats; |
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657 } |
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658 |
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659 // Determines PLAB size for a particular allocation purpose. |
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660 size_t desired_plab_sz(GCAllocPurpose purpose); |
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661 |
20445
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662 inline AllocationContextStats& allocation_context_stats(); |
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663 |
342 | 664 // Do anything common to GC's. |
665 virtual void gc_prologue(bool full); | |
666 virtual void gc_epilogue(bool full); | |
667 | |
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668 inline void set_humongous_is_live(oop obj); |
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669 |
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670 bool humongous_is_live(uint region) { |
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671 return _humongous_is_live.is_live(region); |
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672 } |
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673 |
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674 // Returns whether the given region (which must be a humongous (start) region) |
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675 // is to be considered conservatively live regardless of any other conditions. |
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676 bool humongous_region_is_always_live(uint index); |
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677 // Register the given region to be part of the collection set. |
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678 inline void register_humongous_region_with_in_cset_fast_test(uint index); |
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679 // Register regions with humongous objects (actually on the start region) in |
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680 // the in_cset_fast_test table. |
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681 void register_humongous_regions_with_in_cset_fast_test(); |
526 | 682 // We register a region with the fast "in collection set" test. We |
683 // simply set to true the array slot corresponding to this region. | |
684 void register_region_with_in_cset_fast_test(HeapRegion* r) { | |
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685 _in_cset_fast_test.set_in_cset(r->hrm_index()); |
526 | 686 } |
687 | |
688 // This is a fast test on whether a reference points into the | |
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689 // collection set or not. Assume that the reference |
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690 // points into the heap. |
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691 inline bool in_cset_fast_test(oop obj); |
526 | 692 |
1394
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693 void clear_cset_fast_test() { |
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694 _in_cset_fast_test.clear(); |
1394
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695 } |
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696 |
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697 // This is called at the start of either a concurrent cycle or a Full |
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698 // GC to update the number of old marking cycles started. |
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|
699 void increment_old_marking_cycles_started(); |
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700 |
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701 // This is called at the end of either a concurrent cycle or a Full |
6120
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brutisso
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702 // GC to update the number of old marking cycles completed. Those two |
1656
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|
703 // can happen in a nested fashion, i.e., we start a concurrent |
4e5661ba9d98
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704 // cycle, a Full GC happens half-way through it which ends first, |
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tonyp
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diff
changeset
|
705 // and then the cycle notices that a Full GC happened and ends |
2030
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7000559: G1: assertion failure !outer || (full_collections_started == _full_collections_completed + 1)
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1991
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706 // too. The concurrent parameter is a boolean to help us do a bit |
fb712ff22571
7000559: G1: assertion failure !outer || (full_collections_started == _full_collections_completed + 1)
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diff
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|
707 // tighter consistency checking in the method. If concurrent is |
fb712ff22571
7000559: G1: assertion failure !outer || (full_collections_started == _full_collections_completed + 1)
tonyp
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1991
diff
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|
708 // false, the caller is the inner caller in the nesting (i.e., the |
fb712ff22571
7000559: G1: assertion failure !outer || (full_collections_started == _full_collections_completed + 1)
tonyp
parents:
1991
diff
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|
709 // Full GC). If concurrent is true, the caller is the outer caller |
fb712ff22571
7000559: G1: assertion failure !outer || (full_collections_started == _full_collections_completed + 1)
tonyp
parents:
1991
diff
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|
710 // in this nesting (i.e., the concurrent cycle). Further nesting is |
6120
37552638d24a
7172388: G1: _total_full_collections should not be incremented for concurrent cycles
brutisso
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diff
changeset
|
711 // not currently supported. The end of this call also notifies |
2030
fb712ff22571
7000559: G1: assertion failure !outer || (full_collections_started == _full_collections_completed + 1)
tonyp
parents:
1991
diff
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|
712 // the FullGCCount_lock in case a Java thread is waiting for a full |
fb712ff22571
7000559: G1: assertion failure !outer || (full_collections_started == _full_collections_completed + 1)
tonyp
parents:
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diff
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|
713 // GC to happen (e.g., it called System.gc() with |
1656
4e5661ba9d98
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tonyp
parents:
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diff
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|
714 // +ExplicitGCInvokesConcurrent). |
6120
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brutisso
parents:
6010
diff
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|
715 void increment_old_marking_cycles_completed(bool concurrent); |
1656
4e5661ba9d98
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tonyp
parents:
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diff
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|
716 |
6120
37552638d24a
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brutisso
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diff
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|
717 unsigned int old_marking_cycles_completed() { |
37552638d24a
7172388: G1: _total_full_collections should not be incremented for concurrent cycles
brutisso
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6010
diff
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|
718 return _old_marking_cycles_completed; |
1656
4e5661ba9d98
6944166: G1: explicit GCs are not always handled correctly
tonyp
parents:
1611
diff
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|
719 } |
4e5661ba9d98
6944166: G1: explicit GCs are not always handled correctly
tonyp
parents:
1611
diff
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|
720 |
13400
86e6d691f2e1
8028128: Add a type safe alternative for working with counter based data
mgronlun
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12352
diff
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|
721 void register_concurrent_cycle_start(const Ticks& start_time); |
10405 | 722 void register_concurrent_cycle_end(); |
723 void trace_heap_after_concurrent_cycle(); | |
724 | |
725 G1YCType yc_type(); | |
726 | |
3778
5f6f2615433a
7049999: G1: Make the G1PrintHeapRegions output consistent and complete
tonyp
parents:
3777
diff
changeset
|
727 G1HRPrinter* hr_printer() { return &_hr_printer; } |
5f6f2615433a
7049999: G1: Make the G1PrintHeapRegions output consistent and complete
tonyp
parents:
3777
diff
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|
728 |
17736
58fc1b1523dc
8034079: G1: Refactor the HeapRegionSet hierarchy
brutisso
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17727
diff
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|
729 // Frees a non-humongous region by initializing its contents and |
58fc1b1523dc
8034079: G1: Refactor the HeapRegionSet hierarchy
brutisso
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diff
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|
730 // adding it to the free list that's passed as a parameter (this is |
58fc1b1523dc
8034079: G1: Refactor the HeapRegionSet hierarchy
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diff
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|
731 // usually a local list which will be appended to the master free |
58fc1b1523dc
8034079: G1: Refactor the HeapRegionSet hierarchy
brutisso
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diff
changeset
|
732 // list later). The used bytes of freed regions are accumulated in |
58fc1b1523dc
8034079: G1: Refactor the HeapRegionSet hierarchy
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diff
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|
733 // pre_used. If par is true, the region's RSet will not be freed |
58fc1b1523dc
8034079: G1: Refactor the HeapRegionSet hierarchy
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diff
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|
734 // up. The assumption is that this will be done later. |
17755
96b1c2e06e25
8027295: Free CSet takes ~50% of young pause time
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diff
changeset
|
735 // The locked parameter indicates if the caller has already taken |
96b1c2e06e25
8027295: Free CSet takes ~50% of young pause time
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diff
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|
736 // care of proper synchronization. This may allow some optimizations. |
17736
58fc1b1523dc
8034079: G1: Refactor the HeapRegionSet hierarchy
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diff
changeset
|
737 void free_region(HeapRegion* hr, |
58fc1b1523dc
8034079: G1: Refactor the HeapRegionSet hierarchy
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|
738 FreeRegionList* free_list, |
17755
96b1c2e06e25
8027295: Free CSet takes ~50% of young pause time
tschatzl
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diff
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|
739 bool par, |
96b1c2e06e25
8027295: Free CSet takes ~50% of young pause time
tschatzl
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17753
diff
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|
740 bool locked = false); |
17736
58fc1b1523dc
8034079: G1: Refactor the HeapRegionSet hierarchy
brutisso
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diff
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|
741 |
58fc1b1523dc
8034079: G1: Refactor the HeapRegionSet hierarchy
brutisso
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diff
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|
742 // Frees a humongous region by collapsing it into individual regions |
58fc1b1523dc
8034079: G1: Refactor the HeapRegionSet hierarchy
brutisso
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|
743 // and calling free_region() for each of them. The freed regions |
58fc1b1523dc
8034079: G1: Refactor the HeapRegionSet hierarchy
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|
744 // will be added to the free list that's passed as a parameter (this |
58fc1b1523dc
8034079: G1: Refactor the HeapRegionSet hierarchy
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diff
changeset
|
745 // is usually a local list which will be appended to the master free |
58fc1b1523dc
8034079: G1: Refactor the HeapRegionSet hierarchy
brutisso
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17727
diff
changeset
|
746 // list later). The used bytes of freed regions are accumulated in |
58fc1b1523dc
8034079: G1: Refactor the HeapRegionSet hierarchy
brutisso
parents:
17727
diff
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|
747 // pre_used. If par is true, the region's RSet will not be freed |
58fc1b1523dc
8034079: G1: Refactor the HeapRegionSet hierarchy
brutisso
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diff
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|
748 // up. The assumption is that this will be done later. |
58fc1b1523dc
8034079: G1: Refactor the HeapRegionSet hierarchy
brutisso
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|
749 void free_humongous_region(HeapRegion* hr, |
58fc1b1523dc
8034079: G1: Refactor the HeapRegionSet hierarchy
brutisso
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17727
diff
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|
750 FreeRegionList* free_list, |
58fc1b1523dc
8034079: G1: Refactor the HeapRegionSet hierarchy
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17727
diff
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|
751 bool par); |
342 | 752 protected: |
753 | |
754 // Shrink the garbage-first heap by at most the given size (in bytes!). | |
755 // (Rounds down to a HeapRegion boundary.) | |
756 virtual void shrink(size_t expand_bytes); | |
757 void shrink_helper(size_t expand_bytes); | |
758 | |
1709 | 759 #if TASKQUEUE_STATS |
760 static void print_taskqueue_stats_hdr(outputStream* const st = gclog_or_tty); | |
761 void print_taskqueue_stats(outputStream* const st = gclog_or_tty) const; | |
762 void reset_taskqueue_stats(); | |
763 #endif // TASKQUEUE_STATS | |
764 | |
1973 | 765 // Schedule the VM operation that will do an evacuation pause to |
766 // satisfy an allocation request of word_size. *succeeded will | |
767 // return whether the VM operation was successful (it did do an | |
768 // evacuation pause) or not (another thread beat us to it or the GC | |
769 // locker was active). Given that we should not be holding the | |
770 // Heap_lock when we enter this method, we will pass the | |
771 // gc_count_before (i.e., total_collections()) as a parameter since | |
772 // it has to be read while holding the Heap_lock. Currently, both | |
773 // methods that call do_collection_pause() release the Heap_lock | |
774 // before the call, so it's easy to read gc_count_before just before. | |
12113
f7d3b4387a16
8022872: G1: Use correct GC cause for young GC triggered by humongous allocations
brutisso
parents:
12080
diff
changeset
|
775 HeapWord* do_collection_pause(size_t word_size, |
f7d3b4387a16
8022872: G1: Use correct GC cause for young GC triggered by humongous allocations
brutisso
parents:
12080
diff
changeset
|
776 unsigned int gc_count_before, |
f7d3b4387a16
8022872: G1: Use correct GC cause for young GC triggered by humongous allocations
brutisso
parents:
12080
diff
changeset
|
777 bool* succeeded, |
f7d3b4387a16
8022872: G1: Use correct GC cause for young GC triggered by humongous allocations
brutisso
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12080
diff
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|
778 GCCause::Cause gc_cause); |
342 | 779 |
780 // The guts of the incremental collection pause, executed by the vm | |
1973 | 781 // thread. It returns false if it is unable to do the collection due |
782 // to the GC locker being active, true otherwise | |
783 bool do_collection_pause_at_safepoint(double target_pause_time_ms); | |
342 | 784 |
785 // Actually do the work of evacuating the collection set. | |
10405 | 786 void evacuate_collection_set(EvacuationInfo& evacuation_info); |
342 | 787 |
788 // The g1 remembered set of the heap. | |
789 G1RemSet* _g1_rem_set; | |
790 | |
616
4f360ec815ba
6720309: G1: don't synchronously update RSet during evacuation pauses
iveresov
parents:
545
diff
changeset
|
791 // 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
parents:
545
diff
changeset
|
792 // concurrently after the collection. |
4f360ec815ba
6720309: G1: don't synchronously update RSet during evacuation pauses
iveresov
parents:
545
diff
changeset
|
793 DirtyCardQueueSet _dirty_card_queue_set; |
4f360ec815ba
6720309: G1: don't synchronously update RSet during evacuation pauses
iveresov
parents:
545
diff
changeset
|
794 |
342 | 795 // The closure used to refine a single card. |
796 RefineCardTableEntryClosure* _refine_cte_cl; | |
797 | |
798 // A function to check the consistency of dirty card logs. | |
799 void check_ct_logs_at_safepoint(); | |
800 | |
1705 | 801 // A DirtyCardQueueSet that is used to hold cards that contain |
802 // references into the current collection set. This is used to | |
803 // update the remembered sets of the regions in the collection | |
804 // set in the event of an evacuation failure. | |
805 DirtyCardQueueSet _into_cset_dirty_card_queue_set; | |
806 | |
342 | 807 // After a collection pause, make the regions in the CS into free |
808 // regions. | |
10405 | 809 void free_collection_set(HeapRegion* cs_head, EvacuationInfo& evacuation_info); |
342 | 810 |
1394
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6819061: G1: eliminate serial Other times that are proportional to the collection set length
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parents:
1391
diff
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|
811 // Abandon the current collection set without recording policy |
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
812 // statistics or updating free lists. |
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
813 void abandon_collection_set(HeapRegion* cs_head); |
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
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1391
diff
changeset
|
814 |
342 | 815 // Applies "scan_non_heap_roots" to roots outside the heap, |
816 // "scan_rs" to roots inside the heap (having done "set_region" to | |
6725
da91efe96a93
6964458: Reimplement class meta-data storage to use native memory
coleenp
parents:
6629
diff
changeset
|
817 // indicate the region in which the root resides), |
da91efe96a93
6964458: Reimplement class meta-data storage to use native memory
coleenp
parents:
6629
diff
changeset
|
818 // and does "scan_metadata" If "scan_rs" is |
342 | 819 // NULL, then this step is skipped. The "worker_i" |
820 // param is for use with parallel roots processing, and should be | |
821 // the "i" of the calling parallel worker thread's work(i) function. | |
822 // In the sequential case this param will be ignored. | |
20278
2c6ef90f030a
8049421: G1 Class Unloading after completing a concurrent mark cycle
stefank
parents:
20257
diff
changeset
|
823 void g1_process_roots(OopClosure* scan_non_heap_roots, |
2c6ef90f030a
8049421: G1 Class Unloading after completing a concurrent mark cycle
stefank
parents:
20257
diff
changeset
|
824 OopClosure* scan_non_heap_weak_roots, |
2c6ef90f030a
8049421: G1 Class Unloading after completing a concurrent mark cycle
stefank
parents:
20257
diff
changeset
|
825 OopsInHeapRegionClosure* scan_rs, |
2c6ef90f030a
8049421: G1 Class Unloading after completing a concurrent mark cycle
stefank
parents:
20257
diff
changeset
|
826 CLDClosure* scan_strong_clds, |
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827 CLDClosure* scan_weak_clds, |
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828 CodeBlobClosure* scan_strong_code, |
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829 uint worker_i); |
342 | 830 |
831 // The concurrent marker (and the thread it runs in.) | |
832 ConcurrentMark* _cm; | |
833 ConcurrentMarkThread* _cmThread; | |
834 bool _mark_in_progress; | |
835 | |
836 // The concurrent refiner. | |
837 ConcurrentG1Refine* _cg1r; | |
838 | |
839 // The parallel task queues | |
840 RefToScanQueueSet *_task_queues; | |
841 | |
842 // True iff a evacuation has failed in the current collection. | |
843 bool _evacuation_failed; | |
844 | |
10405 | 845 EvacuationFailedInfo* _evacuation_failed_info_array; |
342 | 846 |
847 // Failed evacuations cause some logical from-space objects to have | |
848 // forwarding pointers to themselves. Reset them. | |
849 void remove_self_forwarding_pointers(); | |
850 | |
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851 // Together, these store an object with a preserved mark, and its mark value. |
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852 Stack<oop, mtGC> _objs_with_preserved_marks; |
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853 Stack<markOop, mtGC> _preserved_marks_of_objs; |
342 | 854 |
855 // Preserve the mark of "obj", if necessary, in preparation for its mark | |
856 // word being overwritten with a self-forwarding-pointer. | |
857 void preserve_mark_if_necessary(oop obj, markOop m); | |
858 | |
859 // The stack of evac-failure objects left to be scanned. | |
860 GrowableArray<oop>* _evac_failure_scan_stack; | |
861 // The closure to apply to evac-failure objects. | |
862 | |
863 OopsInHeapRegionClosure* _evac_failure_closure; | |
864 // Set the field above. | |
865 void | |
866 set_evac_failure_closure(OopsInHeapRegionClosure* evac_failure_closure) { | |
867 _evac_failure_closure = evac_failure_closure; | |
868 } | |
869 | |
870 // Push "obj" on the scan stack. | |
871 void push_on_evac_failure_scan_stack(oop obj); | |
872 // Process scan stack entries until the stack is empty. | |
873 void drain_evac_failure_scan_stack(); | |
874 // True iff an invocation of "drain_scan_stack" is in progress; to | |
875 // prevent unnecessary recursion. | |
876 bool _drain_in_progress; | |
877 | |
878 // Do any necessary initialization for evacuation-failure handling. | |
879 // "cl" is the closure that will be used to process evac-failure | |
880 // objects. | |
881 void init_for_evac_failure(OopsInHeapRegionClosure* cl); | |
882 // Do any necessary cleanup for evacuation-failure handling data | |
883 // structures. | |
884 void finalize_for_evac_failure(); | |
885 | |
886 // An attempt to evacuate "obj" has failed; take necessary steps. | |
10405 | 887 oop handle_evacuation_failure_par(G1ParScanThreadState* _par_scan_state, oop obj); |
342 | 888 void handle_evacuation_failure_common(oop obj, markOop m); |
889 | |
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890 #ifndef PRODUCT |
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891 // Support for forcing evacuation failures. Analogous to |
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892 // PromotionFailureALot for the other collectors. |
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893 |
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894 // Records whether G1EvacuationFailureALot should be in effect |
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895 // for the current GC |
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896 bool _evacuation_failure_alot_for_current_gc; |
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897 |
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898 // Used to record the GC number for interval checking when |
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899 // determining whether G1EvaucationFailureALot is in effect |
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900 // for the current GC. |
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901 size_t _evacuation_failure_alot_gc_number; |
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902 |
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903 // Count of the number of evacuations between failures. |
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904 volatile size_t _evacuation_failure_alot_count; |
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905 |
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906 // Set whether G1EvacuationFailureALot should be in effect |
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907 // for the current GC (based upon the type of GC and which |
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908 // command line flags are set); |
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909 inline bool evacuation_failure_alot_for_gc_type(bool gcs_are_young, |
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910 bool during_initial_mark, |
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911 bool during_marking); |
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912 |
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913 inline void set_evacuation_failure_alot_for_current_gc(); |
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914 |
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915 // Return true if it's time to cause an evacuation failure. |
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916 inline bool evacuation_should_fail(); |
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917 |
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918 // Reset the G1EvacuationFailureALot counters. Should be called at |
10405 | 919 // the end of an evacuation pause in which an evacuation failure occurred. |
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920 inline void reset_evacuation_should_fail(); |
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921 #endif // !PRODUCT |
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922 |
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923 // ("Weak") Reference processing support. |
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924 // |
10405 | 925 // G1 has 2 instances of the reference processor class. One |
3979
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926 // (_ref_processor_cm) handles reference object discovery |
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927 // and subsequent processing during concurrent marking cycles. |
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928 // |
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929 // The other (_ref_processor_stw) handles reference object |
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930 // discovery and processing during full GCs and incremental |
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931 // evacuation pauses. |
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932 // |
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933 // During an incremental pause, reference discovery will be |
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934 // temporarily disabled for _ref_processor_cm and will be |
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935 // enabled for _ref_processor_stw. At the end of the evacuation |
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936 // pause references discovered by _ref_processor_stw will be |
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937 // processed and discovery will be disabled. The previous |
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938 // setting for reference object discovery for _ref_processor_cm |
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939 // will be re-instated. |
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940 // |
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941 // At the start of marking: |
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942 // * Discovery by the CM ref processor is verified to be inactive |
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943 // and it's discovered lists are empty. |
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944 // * Discovery by the CM ref processor is then enabled. |
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945 // |
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946 // At the end of marking: |
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947 // * Any references on the CM ref processor's discovered |
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948 // lists are processed (possibly MT). |
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949 // |
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950 // At the start of full GC we: |
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951 // * Disable discovery by the CM ref processor and |
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952 // empty CM ref processor's discovered lists |
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953 // (without processing any entries). |
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954 // * Verify that the STW ref processor is inactive and it's |
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955 // discovered lists are empty. |
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956 // * Temporarily set STW ref processor discovery as single threaded. |
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957 // * Temporarily clear the STW ref processor's _is_alive_non_header |
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958 // field. |
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959 // * Finally enable discovery by the STW ref processor. |
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960 // |
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961 // The STW ref processor is used to record any discovered |
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962 // references during the full GC. |
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963 // |
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964 // At the end of a full GC we: |
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965 // * Enqueue any reference objects discovered by the STW ref processor |
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966 // that have non-live referents. This has the side-effect of |
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967 // making the STW ref processor inactive by disabling discovery. |
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968 // * Verify that the CM ref processor is still inactive |
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969 // and no references have been placed on it's discovered |
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970 // lists (also checked as a precondition during initial marking). |
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971 |
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972 // The (stw) reference processor... |
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973 ReferenceProcessor* _ref_processor_stw; |
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974 |
10405 | 975 STWGCTimer* _gc_timer_stw; |
976 ConcurrentGCTimer* _gc_timer_cm; | |
977 | |
978 G1OldTracer* _gc_tracer_cm; | |
979 G1NewTracer* _gc_tracer_stw; | |
980 | |
3979
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981 // During reference object discovery, the _is_alive_non_header |
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982 // closure (if non-null) is applied to the referent object to |
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983 // determine whether the referent is live. If so then the |
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984 // reference object does not need to be 'discovered' and can |
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985 // be treated as a regular oop. This has the benefit of reducing |
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986 // the number of 'discovered' reference objects that need to |
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987 // be processed. |
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988 // |
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989 // Instance of the is_alive closure for embedding into the |
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990 // STW reference processor as the _is_alive_non_header field. |
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991 // Supplying a value for the _is_alive_non_header field is |
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992 // optional but doing so prevents unnecessary additions to |
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993 // the discovered lists during reference discovery. |
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994 G1STWIsAliveClosure _is_alive_closure_stw; |
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995 |
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996 // The (concurrent marking) reference processor... |
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997 ReferenceProcessor* _ref_processor_cm; |
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998 |
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999 // Instance of the concurrent mark is_alive closure for embedding |
3979
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1000 // into the Concurrent Marking reference processor as the |
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1001 // _is_alive_non_header field. Supplying a value for the |
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1002 // _is_alive_non_header field is optional but doing so prevents |
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1003 // unnecessary additions to the discovered lists during reference |
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1004 // discovery. |
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1005 G1CMIsAliveClosure _is_alive_closure_cm; |
342 | 1006 |
4709
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1007 // Cache used by G1CollectedHeap::start_cset_region_for_worker(). |
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1008 HeapRegion** _worker_cset_start_region; |
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1009 |
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1010 // Time stamp to validate the regions recorded in the cache |
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1011 // used by G1CollectedHeap::start_cset_region_for_worker(). |
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1012 // The heap region entry for a given worker is valid iff |
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1013 // the associated time stamp value matches the current value |
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1014 // of G1CollectedHeap::_gc_time_stamp. |
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1015 unsigned int* _worker_cset_start_region_time_stamp; |
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1016 |
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1017 enum G1H_process_roots_tasks { |
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1018 G1H_PS_filter_satb_buffers, |
342 | 1019 G1H_PS_refProcessor_oops_do, |
1020 // Leave this one last. | |
1021 G1H_PS_NumElements | |
1022 }; | |
1023 | |
1024 SubTasksDone* _process_strong_tasks; | |
1025 | |
2152 | 1026 volatile bool _free_regions_coming; |
342 | 1027 |
1028 public: | |
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1029 |
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1030 SubTasksDone* process_strong_tasks() { return _process_strong_tasks; } |
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1031 |
342 | 1032 void set_refine_cte_cl_concurrency(bool concurrent); |
1033 | |
1709 | 1034 RefToScanQueue *task_queue(int i) const; |
342 | 1035 |
616
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1036 // A set of cards where updates happened during the GC |
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1037 DirtyCardQueueSet& dirty_card_queue_set() { return _dirty_card_queue_set; } |
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1038 |
1705 | 1039 // A DirtyCardQueueSet that is used to hold cards that contain |
1040 // references into the current collection set. This is used to | |
1041 // update the remembered sets of the regions in the collection | |
1042 // set in the event of an evacuation failure. | |
1043 DirtyCardQueueSet& into_cset_dirty_card_queue_set() | |
1044 { return _into_cset_dirty_card_queue_set; } | |
1045 | |
342 | 1046 // Create a G1CollectedHeap with the specified policy. |
1047 // Must call the initialize method afterwards. | |
1048 // May not return if something goes wrong. | |
1049 G1CollectedHeap(G1CollectorPolicy* policy); | |
1050 | |
1051 // Initialize the G1CollectedHeap to have the initial and | |
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1052 // maximum sizes and remembered and barrier sets |
342 | 1053 // specified by the policy object. |
1054 jint initialize(); | |
1055 | |
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1056 virtual void stop(); |
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1057 |
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1058 // Return the (conservative) maximum heap alignment for any G1 heap |
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1059 static size_t conservative_max_heap_alignment(); |
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1060 |
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1061 // Initialize weak reference processing. |
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1062 virtual void ref_processing_init(); |
342 | 1063 |
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1064 void set_par_threads(uint t) { |
342 | 1065 SharedHeap::set_par_threads(t); |
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1066 // Done in SharedHeap but oddly there are |
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1067 // two _process_strong_tasks's in a G1CollectedHeap |
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1068 // so do it here too. |
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1069 _process_strong_tasks->set_n_threads(t); |
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1070 } |
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1071 |
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1072 // Set _n_par_threads according to a policy TBD. |
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1073 void set_par_threads(); |
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1074 |
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1075 void set_n_termination(int t) { |
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1076 _process_strong_tasks->set_n_threads(t); |
342 | 1077 } |
1078 | |
1079 virtual CollectedHeap::Name kind() const { | |
1080 return CollectedHeap::G1CollectedHeap; | |
1081 } | |
1082 | |
1083 // The current policy object for the collector. | |
1084 G1CollectorPolicy* g1_policy() const { return _g1_policy; } | |
1085 | |
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1086 virtual CollectorPolicy* collector_policy() const { return (CollectorPolicy*) g1_policy(); } |
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1087 |
342 | 1088 // Adaptive size policy. No such thing for g1. |
1089 virtual AdaptiveSizePolicy* size_policy() { return NULL; } | |
1090 | |
1091 // The rem set and barrier set. | |
1092 G1RemSet* g1_rem_set() const { return _g1_rem_set; } | |
1093 | |
1094 unsigned get_gc_time_stamp() { | |
1095 return _gc_time_stamp; | |
1096 } | |
1097 | |
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1098 inline void reset_gc_time_stamp(); |
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1099 |
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1100 void check_gc_time_stamps() PRODUCT_RETURN; |
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1101 |
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1102 inline void increment_gc_time_stamp(); |
342 | 1103 |
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1104 // Reset the given region's GC timestamp. If it's starts humongous, |
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1105 // also reset the GC timestamp of its corresponding |
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1106 // continues humongous regions too. |
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1107 void reset_gc_time_stamps(HeapRegion* hr); |
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1108 |
1705 | 1109 void iterate_dirty_card_closure(CardTableEntryClosure* cl, |
1110 DirtyCardQueue* into_cset_dcq, | |
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1111 bool concurrent, uint worker_i); |
342 | 1112 |
1113 // The shared block offset table array. | |
1114 G1BlockOffsetSharedArray* bot_shared() const { return _bot_shared; } | |
1115 | |
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1116 // Reference Processing accessors |
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1117 |
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1118 // The STW reference processor.... |
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1119 ReferenceProcessor* ref_processor_stw() const { return _ref_processor_stw; } |
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1120 |
10405 | 1121 // The Concurrent Marking reference processor... |
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1122 ReferenceProcessor* ref_processor_cm() const { return _ref_processor_cm; } |
342 | 1123 |
10405 | 1124 ConcurrentGCTimer* gc_timer_cm() const { return _gc_timer_cm; } |
1125 G1OldTracer* gc_tracer_cm() const { return _gc_tracer_cm; } | |
1126 | |
342 | 1127 virtual size_t capacity() const; |
1128 virtual size_t used() const; | |
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1129 // This should be called when we're not holding the heap lock. The |
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1130 // result might be a bit inaccurate. |
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1131 size_t used_unlocked() const; |
342 | 1132 size_t recalculate_used() const; |
1133 | |
1134 // These virtual functions do the actual allocation. | |
1135 // Some heaps may offer a contiguous region for shared non-blocking | |
1136 // allocation, via inlined code (by exporting the address of the top and | |
1137 // end fields defining the extent of the contiguous allocation region.) | |
1138 // But G1CollectedHeap doesn't yet support this. | |
1139 | |
1140 virtual bool is_maximal_no_gc() const { | |
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1141 return _hrm.available() == 0; |
342 | 1142 } |
1143 | |
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1144 // The current number of regions in the heap. |
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1145 uint num_regions() const { return _hrm.length(); } |
3766 | 1146 |
1147 // The max number of regions in the heap. | |
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1148 uint max_regions() const { return _hrm.max_length(); } |
342 | 1149 |
1150 // The number of regions that are completely free. | |
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1151 uint num_free_regions() const { return _hrm.num_free_regions(); } |
342 | 1152 |
1153 // The number of regions that are not completely free. | |
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1154 uint num_used_regions() const { return num_regions() - num_free_regions(); } |
3766 | 1155 |
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1156 void verify_not_dirty_region(HeapRegion* hr) PRODUCT_RETURN; |
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1157 void verify_dirty_region(HeapRegion* hr) PRODUCT_RETURN; |
2433
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1158 void verify_dirty_young_list(HeapRegion* head) PRODUCT_RETURN; |
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1159 void verify_dirty_young_regions() PRODUCT_RETURN; |
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1160 |
20291
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1161 #ifndef PRODUCT |
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1162 // Make sure that the given bitmap has no marked objects in the |
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1163 // range [from,limit). If it does, print an error message and return |
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1164 // false. Otherwise, just return true. bitmap_name should be "prev" |
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1165 // or "next". |
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1166 bool verify_no_bits_over_tams(const char* bitmap_name, CMBitMapRO* bitmap, |
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1167 HeapWord* from, HeapWord* limit); |
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1168 |
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1169 // Verify that the prev / next bitmap range [tams,end) for the given |
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1170 // region has no marks. Return true if all is well, false if errors |
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1171 // are detected. |
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1172 bool verify_bitmaps(const char* caller, HeapRegion* hr); |
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1173 #endif // PRODUCT |
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1174 |
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1175 // If G1VerifyBitmaps is set, verify that the marking bitmaps for |
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1176 // the given region do not have any spurious marks. If errors are |
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1177 // detected, print appropriate error messages and crash. |
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1178 void check_bitmaps(const char* caller, HeapRegion* hr) PRODUCT_RETURN; |
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1179 |
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1180 // If G1VerifyBitmaps is set, verify that the marking bitmaps do not |
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1181 // have any spurious marks. If errors are detected, print |
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1182 // appropriate error messages and crash. |
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1183 void check_bitmaps(const char* caller) PRODUCT_RETURN; |
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1184 |
2152 | 1185 // verify_region_sets() performs verification over the region |
1186 // lists. It will be compiled in the product code to be used when | |
1187 // necessary (i.e., during heap verification). | |
1188 void verify_region_sets(); | |
342 | 1189 |
2152 | 1190 // verify_region_sets_optional() is planted in the code for |
1191 // list verification in non-product builds (and it can be enabled in | |
10405 | 1192 // product builds by defining HEAP_REGION_SET_FORCE_VERIFY to be 1). |
2152 | 1193 #if HEAP_REGION_SET_FORCE_VERIFY |
1194 void verify_region_sets_optional() { | |
1195 verify_region_sets(); | |
1196 } | |
1197 #else // HEAP_REGION_SET_FORCE_VERIFY | |
1198 void verify_region_sets_optional() { } | |
1199 #endif // HEAP_REGION_SET_FORCE_VERIFY | |
342 | 1200 |
2152 | 1201 #ifdef ASSERT |
2361 | 1202 bool is_on_master_free_list(HeapRegion* hr) { |
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1203 return _hrm.is_free(hr); |
2152 | 1204 } |
1205 #endif // ASSERT | |
342 | 1206 |
2152 | 1207 // Wrapper for the region list operations that can be called from |
1208 // methods outside this class. | |
342 | 1209 |
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1210 void secondary_free_list_add(FreeRegionList* list) { |
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1211 _secondary_free_list.add_ordered(list); |
2152 | 1212 } |
342 | 1213 |
2152 | 1214 void append_secondary_free_list() { |
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1215 _hrm.insert_list_into_free_list(&_secondary_free_list); |
2152 | 1216 } |
342 | 1217 |
2361 | 1218 void append_secondary_free_list_if_not_empty_with_lock() { |
1219 // If the secondary free list looks empty there's no reason to | |
1220 // take the lock and then try to append it. | |
2152 | 1221 if (!_secondary_free_list.is_empty()) { |
1222 MutexLockerEx x(SecondaryFreeList_lock, Mutex::_no_safepoint_check_flag); | |
1223 append_secondary_free_list(); | |
1224 } | |
1225 } | |
342 | 1226 |
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1227 inline void old_set_remove(HeapRegion* hr); |
4072 | 1228 |
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1229 size_t non_young_capacity_bytes() { |
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1230 return _old_set.total_capacity_bytes() + _humongous_set.total_capacity_bytes(); |
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1231 } |
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1232 |
2152 | 1233 void set_free_regions_coming(); |
1234 void reset_free_regions_coming(); | |
1235 bool free_regions_coming() { return _free_regions_coming; } | |
1236 void wait_while_free_regions_coming(); | |
342 | 1237 |
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1238 // Determine whether the given region is one that we are using as an |
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1239 // old GC alloc region. |
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1240 bool is_old_gc_alloc_region(HeapRegion* hr) { |
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1241 return _allocator->is_retained_old_region(hr); |
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1242 } |
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1243 |
342 | 1244 // Perform a collection of the heap; intended for use in implementing |
1245 // "System.gc". This probably implies as full a collection as the | |
1246 // "CollectedHeap" supports. | |
1247 virtual void collect(GCCause::Cause cause); | |
1248 | |
1249 // The same as above but assume that the caller holds the Heap_lock. | |
1250 void collect_locked(GCCause::Cause cause); | |
1251 | |
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1252 virtual bool copy_allocation_context_stats(const jint* contexts, |
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1253 jlong* totals, |
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1254 jbyte* accuracy, |
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1255 jint len); |
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1256 |
10405 | 1257 // True iff an evacuation has failed in the most-recent collection. |
342 | 1258 bool evacuation_failed() { return _evacuation_failed; } |
1259 | |
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1260 void remove_from_old_sets(const HeapRegionSetCount& old_regions_removed, const HeapRegionSetCount& humongous_regions_removed); |
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1261 void prepend_to_freelist(FreeRegionList* list); |
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1262 void decrement_summary_bytes(size_t bytes); |
342 | 1263 |
4708 | 1264 // Returns "TRUE" iff "p" points into the committed areas of the heap. |
342 | 1265 virtual bool is_in(const void* p) const; |
20337 | 1266 #ifdef ASSERT |
1267 // Returns whether p is in one of the available areas of the heap. Slow but | |
1268 // extensive version. | |
1269 bool is_in_exact(const void* p) const; | |
1270 #endif | |
342 | 1271 |
1272 // Return "TRUE" iff the given object address is within the collection | |
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1273 // set. Slow implementation. |
342 | 1274 inline bool obj_in_cs(oop obj); |
1275 | |
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1276 inline bool is_in_cset(oop obj); |
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1277 |
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1278 inline bool is_in_cset_or_humongous(const oop obj); |
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1279 |
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1280 enum in_cset_state_t { |
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1281 InNeither, // neither in collection set nor humongous |
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1282 InCSet, // region is in collection set only |
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1283 IsHumongous // region is a humongous start region |
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1284 }; |
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1285 private: |
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1286 // Instances of this class are used for quick tests on whether a reference points |
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1287 // into the collection set or is a humongous object (points into a humongous |
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1288 // object). |
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1289 // Each of the array's elements denotes whether the corresponding region is in |
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1290 // the collection set or a humongous region. |
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1291 // We use this to quickly reclaim humongous objects: by making a humongous region |
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1292 // succeed this test, we sort-of add it to the collection set. During the reference |
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1293 // iteration closures, when we see a humongous region, we simply mark it as |
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1294 // referenced, i.e. live. |
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1295 class G1FastCSetBiasedMappedArray : public G1BiasedMappedArray<char> { |
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1296 protected: |
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1297 char default_value() const { return G1CollectedHeap::InNeither; } |
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1298 public: |
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1299 void set_humongous(uintptr_t index) { |
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1300 assert(get_by_index(index) != InCSet, "Should not overwrite InCSet values"); |
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1301 set_by_index(index, G1CollectedHeap::IsHumongous); |
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1302 } |
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1303 |
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1304 void clear_humongous(uintptr_t index) { |
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1305 set_by_index(index, G1CollectedHeap::InNeither); |
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1306 } |
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1307 |
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1308 void set_in_cset(uintptr_t index) { |
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1309 assert(get_by_index(index) != G1CollectedHeap::IsHumongous, "Should not overwrite IsHumongous value"); |
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1310 set_by_index(index, G1CollectedHeap::InCSet); |
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1311 } |
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1312 |
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1313 bool is_in_cset_or_humongous(HeapWord* addr) const { return get_by_address(addr) != G1CollectedHeap::InNeither; } |
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1314 bool is_in_cset(HeapWord* addr) const { return get_by_address(addr) == G1CollectedHeap::InCSet; } |
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1315 G1CollectedHeap::in_cset_state_t at(HeapWord* addr) const { return (G1CollectedHeap::in_cset_state_t)get_by_address(addr); } |
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1316 void clear() { G1BiasedMappedArray<char>::clear(); } |
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1317 }; |
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1318 |
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1319 // This array is used for a quick test on whether a reference points into |
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1320 // the collection set or not. Each of the array's elements denotes whether the |
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1321 // corresponding region is in the collection set or not. |
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1322 G1FastCSetBiasedMappedArray _in_cset_fast_test; |
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1323 |
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1324 public: |
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1325 |
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1326 inline in_cset_state_t in_cset_state(const oop obj); |
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1327 |
342 | 1328 // Return "TRUE" iff the given object address is in the reserved |
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1329 // region of g1. |
342 | 1330 bool is_in_g1_reserved(const void* p) const { |
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1331 return _hrm.reserved().contains(p); |
342 | 1332 } |
1333 | |
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1334 // Returns a MemRegion that corresponds to the space that has been |
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1335 // reserved for the heap |
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1336 MemRegion g1_reserved() const { |
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1337 return _hrm.reserved(); |
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1338 } |
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1339 |
2311 | 1340 virtual bool is_in_closed_subset(const void* p) const; |
342 | 1341 |
20337 | 1342 G1SATBCardTableLoggingModRefBS* g1_barrier_set() { |
1343 return (G1SATBCardTableLoggingModRefBS*) barrier_set(); | |
12343 | 1344 } |
1345 | |
342 | 1346 // This resets the card table to all zeros. It is used after |
1347 // a collection pause which used the card table to claim cards. | |
1348 void cleanUpCardTable(); | |
1349 | |
1350 // Iteration functions. | |
1351 | |
1352 // Iterate over all the ref-containing fields of all objects, calling | |
1353 // "cl.do_oop" on each. | |
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1354 virtual void oop_iterate(ExtendedOopClosure* cl); |
342 | 1355 |
1356 // Iterate over all objects, calling "cl.do_object" on each. | |
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1357 virtual void object_iterate(ObjectClosure* cl); |
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1358 |
678 | 1359 virtual void safe_object_iterate(ObjectClosure* cl) { |
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1360 object_iterate(cl); |
678 | 1361 } |
342 | 1362 |
1363 // Iterate over all spaces in use in the heap, in ascending address order. | |
1364 virtual void space_iterate(SpaceClosure* cl); | |
1365 | |
1366 // Iterate over heap regions, in address order, terminating the | |
1367 // iteration early if the "doHeapRegion" method returns "true". | |
3766 | 1368 void heap_region_iterate(HeapRegionClosure* blk) const; |
342 | 1369 |
3766 | 1370 // Return the region with the given index. It assumes the index is valid. |
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1371 inline HeapRegion* region_at(uint index) const; |
342 | 1372 |
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1373 // Calculate the region index of the given address. Given address must be |
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1374 // within the heap. |
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1375 inline uint addr_to_region(HeapWord* addr) const; |
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1376 |
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1377 inline HeapWord* bottom_addr_for_region(uint index) const; |
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1378 |
342 | 1379 // Divide the heap region sequence into "chunks" of some size (the number |
1380 // of regions divided by the number of parallel threads times some | |
1381 // overpartition factor, currently 4). Assumes that this will be called | |
1382 // in parallel by ParallelGCThreads worker threads with discinct worker | |
1383 // ids in the range [0..max(ParallelGCThreads-1, 1)], that all parallel | |
1384 // calls will use the same "claim_value", and that that claim value is | |
1385 // different from the claim_value of any heap region before the start of | |
1386 // the iteration. Applies "blk->doHeapRegion" to each of the regions, by | |
1387 // attempting to claim the first region in each chunk, and, if | |
1388 // successful, applying the closure to each region in the chunk (and | |
1389 // setting the claim value of the second and subsequent regions of the | |
1390 // chunk.) For now requires that "doHeapRegion" always returns "false", | |
1391 // i.e., that a closure never attempt to abort a traversal. | |
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1392 void heap_region_par_iterate_chunked(HeapRegionClosure* cl, |
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1393 uint worker_id, |
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1394 uint num_workers, |
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1395 jint claim_value) const; |
342 | 1396 |
390 | 1397 // It resets all the region claim values to the default. |
1398 void reset_heap_region_claim_values(); | |
1399 | |
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1400 // Resets the claim values of regions in the current |
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1401 // collection set to the default. |
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1402 void reset_cset_heap_region_claim_values(); |
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1403 |
355 | 1404 #ifdef ASSERT |
1405 bool check_heap_region_claim_values(jint claim_value); | |
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1406 |
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1407 // Same as the routine above but only checks regions in the |
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1408 // current collection set. |
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1409 bool check_cset_heap_region_claim_values(jint claim_value); |
355 | 1410 #endif // ASSERT |
1411 | |
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1412 // Clear the cached cset start regions and (more importantly) |
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1413 // the time stamps. Called when we reset the GC time stamp. |
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1414 void clear_cset_start_regions(); |
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1415 |
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1416 // Given the id of a worker, obtain or calculate a suitable |
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1417 // starting region for iterating over the current collection set. |
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1418 HeapRegion* start_cset_region_for_worker(uint worker_i); |
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1419 |
342 | 1420 // Iterate over the regions (if any) in the current collection set. |
1421 void collection_set_iterate(HeapRegionClosure* blk); | |
1422 | |
1423 // As above but starting from region r | |
1424 void collection_set_iterate_from(HeapRegion* r, HeapRegionClosure *blk); | |
1425 | |
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1426 HeapRegion* next_compaction_region(const HeapRegion* from) const; |
342 | 1427 |
1428 // A CollectedHeap will contain some number of spaces. This finds the | |
1429 // space containing a given address, or else returns NULL. | |
1430 virtual Space* space_containing(const void* addr) const; | |
1431 | |
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1432 // Returns the HeapRegion that contains addr. addr must not be NULL. |
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1433 template <class T> |
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1434 inline HeapRegion* heap_region_containing_raw(const T addr) const; |
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1435 |
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1436 // Returns the HeapRegion that contains addr. addr must not be NULL. |
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1437 // If addr is within a humongous continues region, it returns its humongous start region. |
3766 | 1438 template <class T> |
1439 inline HeapRegion* heap_region_containing(const T addr) const; | |
342 | 1440 |
1441 // A CollectedHeap is divided into a dense sequence of "blocks"; that is, | |
1442 // each address in the (reserved) heap is a member of exactly | |
1443 // one block. The defining characteristic of a block is that it is | |
1444 // possible to find its size, and thus to progress forward to the next | |
1445 // block. (Blocks may be of different sizes.) Thus, blocks may | |
1446 // represent Java objects, or they might be free blocks in a | |
1447 // free-list-based heap (or subheap), as long as the two kinds are | |
1448 // distinguishable and the size of each is determinable. | |
1449 | |
1450 // Returns the address of the start of the "block" that contains the | |
1451 // address "addr". We say "blocks" instead of "object" since some heaps | |
1452 // may not pack objects densely; a chunk may either be an object or a | |
1453 // non-object. | |
1454 virtual HeapWord* block_start(const void* addr) const; | |
1455 | |
1456 // Requires "addr" to be the start of a chunk, and returns its size. | |
1457 // "addr + size" is required to be the start of a new chunk, or the end | |
1458 // of the active area of the heap. | |
1459 virtual size_t block_size(const HeapWord* addr) const; | |
1460 | |
1461 // Requires "addr" to be the start of a block, and returns "TRUE" iff | |
1462 // the block is an object. | |
1463 virtual bool block_is_obj(const HeapWord* addr) const; | |
1464 | |
1465 // Does this heap support heap inspection? (+PrintClassHistogram) | |
1466 virtual bool supports_heap_inspection() const { return true; } | |
1467 | |
1468 // Section on thread-local allocation buffers (TLABs) | |
1469 // See CollectedHeap for semantics. | |
1470 | |
17727 | 1471 bool supports_tlab_allocation() const; |
1472 size_t tlab_capacity(Thread* ignored) const; | |
1473 size_t tlab_used(Thread* ignored) const; | |
1474 size_t max_tlab_size() const; | |
1475 size_t unsafe_max_tlab_alloc(Thread* ignored) const; | |
342 | 1476 |
1477 // Can a compiler initialize a new object without store barriers? | |
1478 // This permission only extends from the creation of a new object | |
1027
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1479 // via a TLAB up to the first subsequent safepoint. If such permission |
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1480 // is granted for this heap type, the compiler promises to call |
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1481 // defer_store_barrier() below on any slow path allocation of |
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1482 // a new object for which such initializing store barriers will |
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1483 // have been elided. G1, like CMS, allows this, but should be |
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1484 // ready to provide a compensating write barrier as necessary |
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1485 // if that storage came out of a non-young region. The efficiency |
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1486 // of this implementation depends crucially on being able to |
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1487 // answer very efficiently in constant time whether a piece of |
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1488 // storage in the heap comes from a young region or not. |
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1489 // See ReduceInitialCardMarks. |
342 | 1490 virtual bool can_elide_tlab_store_barriers() const { |
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1491 return true; |
1027
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1492 } |
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1493 |
1166 | 1494 virtual bool card_mark_must_follow_store() const { |
1495 return true; | |
1496 } | |
1497 | |
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1498 inline bool is_in_young(const oop obj); |
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1499 |
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1500 #ifdef ASSERT |
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1501 virtual bool is_in_partial_collection(const void* p); |
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1502 #endif |
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1503 |
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1504 virtual bool is_scavengable(const void* addr); |
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1505 |
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1506 // We don't need barriers for initializing stores to objects |
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1507 // in the young gen: for the SATB pre-barrier, there is no |
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1508 // pre-value that needs to be remembered; for the remembered-set |
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1509 // update logging post-barrier, we don't maintain remembered set |
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1510 // information for young gen objects. |
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1511 virtual inline bool can_elide_initializing_store_barrier(oop new_obj); |
342 | 1512 |
1513 // Returns "true" iff the given word_size is "very large". | |
1514 static bool isHumongous(size_t word_size) { | |
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1515 // Note this has to be strictly greater-than as the TLABs |
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1516 // are capped at the humongous thresold and we want to |
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1517 // ensure that we don't try to allocate a TLAB as |
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1518 // humongous and that we don't allocate a humongous |
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1519 // object in a TLAB. |
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1520 return word_size > _humongous_object_threshold_in_words; |
342 | 1521 } |
1522 | |
1523 // Update mod union table with the set of dirty cards. | |
1524 void updateModUnion(); | |
1525 | |
1526 // Set the mod union bits corresponding to the given memRegion. Note | |
1527 // that this is always a safe operation, since it doesn't clear any | |
1528 // bits. | |
1529 void markModUnionRange(MemRegion mr); | |
1530 | |
1531 // Records the fact that a marking phase is no longer in progress. | |
1532 void set_marking_complete() { | |
1533 _mark_in_progress = false; | |
1534 } | |
1535 void set_marking_started() { | |
1536 _mark_in_progress = true; | |
1537 } | |
1538 bool mark_in_progress() { | |
1539 return _mark_in_progress; | |
1540 } | |
1541 | |
1542 // Print the maximum heap capacity. | |
1543 virtual size_t max_capacity() const; | |
1544 | |
1545 virtual jlong millis_since_last_gc(); | |
1546 | |
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1547 |
342 | 1548 // Convenience function to be used in situations where the heap type can be |
1549 // asserted to be this type. | |
1550 static G1CollectedHeap* heap(); | |
1551 | |
1552 void set_region_short_lived_locked(HeapRegion* hr); | |
1553 // add appropriate methods for any other surv rate groups | |
1554 | |
17727 | 1555 YoungList* young_list() const { return _young_list; } |
342 | 1556 |
1557 // debugging | |
1558 bool check_young_list_well_formed() { | |
1559 return _young_list->check_list_well_formed(); | |
1560 } | |
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1561 |
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1562 bool check_young_list_empty(bool check_heap, |
342 | 1563 bool check_sample = true); |
1564 | |
1565 // *** Stuff related to concurrent marking. It's not clear to me that so | |
1566 // many of these need to be public. | |
1567 | |
1568 // The functions below are helper functions that a subclass of | |
1569 // "CollectedHeap" can use in the implementation of its virtual | |
1570 // functions. | |
1571 // This performs a concurrent marking of the live objects in a | |
1572 // bitmap off to the side. | |
1573 void doConcurrentMark(); | |
1574 | |
1575 bool isMarkedPrev(oop obj) const; | |
1576 bool isMarkedNext(oop obj) const; | |
1577 | |
1578 // Determine if an object is dead, given the object and also | |
1579 // the region to which the object belongs. An object is dead | |
1580 // iff a) it was not allocated since the last mark and b) it | |
1581 // is not marked. | |
1582 bool is_obj_dead(const oop obj, const HeapRegion* hr) const { | |
1583 return | |
1584 !hr->obj_allocated_since_prev_marking(obj) && | |
1585 !isMarkedPrev(obj); | |
1586 } | |
1587 | |
1588 // This function returns true when an object has been | |
1589 // around since the previous marking and hasn't yet | |
1590 // been marked during this marking. | |
1591 bool is_obj_ill(const oop obj, const HeapRegion* hr) const { | |
1592 return | |
1593 !hr->obj_allocated_since_next_marking(obj) && | |
1594 !isMarkedNext(obj); | |
1595 } | |
1596 | |
1597 // Determine if an object is dead, given only the object itself. | |
1598 // This will find the region to which the object belongs and | |
1599 // then call the region version of the same function. | |
1600 | |
1601 // Added if it is NULL it isn't dead. | |
1602 | |
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1603 inline bool is_obj_dead(const oop obj) const; |
342 | 1604 |
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1605 inline bool is_obj_ill(const oop obj) const; |
342 | 1606 |
12080 | 1607 bool allocated_since_marking(oop obj, HeapRegion* hr, VerifyOption vo); |
1608 HeapWord* top_at_mark_start(HeapRegion* hr, VerifyOption vo); | |
1609 bool is_marked(oop obj, VerifyOption vo); | |
1610 const char* top_at_mark_start_str(VerifyOption vo); | |
1611 | |
1612 ConcurrentMark* concurrent_mark() const { return _cm; } | |
1613 | |
1614 // Refinement | |
1615 | |
1616 ConcurrentG1Refine* concurrent_g1_refine() const { return _cg1r; } | |
1617 | |
1618 // The dirty cards region list is used to record a subset of regions | |
1619 // whose cards need clearing. The list if populated during the | |
1620 // remembered set scanning and drained during the card table | |
1621 // cleanup. Although the methods are reentrant, population/draining | |
1622 // phases must not overlap. For synchronization purposes the last | |
1623 // element on the list points to itself. | |
1624 HeapRegion* _dirty_cards_region_list; | |
1625 void push_dirty_cards_region(HeapRegion* hr); | |
1626 HeapRegion* pop_dirty_cards_region(); | |
1627 | |
1628 // Optimized nmethod scanning support routines | |
1629 | |
1630 // Register the given nmethod with the G1 heap | |
1631 virtual void register_nmethod(nmethod* nm); | |
1632 | |
1633 // Unregister the given nmethod from the G1 heap | |
1634 virtual void unregister_nmethod(nmethod* nm); | |
1635 | |
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1636 // Free up superfluous code root memory. |
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1637 void purge_code_root_memory(); |
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1638 |
12080 | 1639 // Rebuild the stong code root lists for each region |
1640 // after a full GC | |
1641 void rebuild_strong_code_roots(); | |
1642 | |
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1643 // Delete entries for dead interned string and clean up unreferenced symbols |
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1644 // in symbol table, possibly in parallel. |
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1645 void unlink_string_and_symbol_table(BoolObjectClosure* is_alive, bool unlink_strings = true, bool unlink_symbols = true); |
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1646 |
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1647 // Parallel phase of unloading/cleaning after G1 concurrent mark. |
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1648 void parallel_cleaning(BoolObjectClosure* is_alive, bool process_strings, bool process_symbols, bool class_unloading_occurred); |
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1649 |
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1650 // Redirty logged cards in the refinement queue. |
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1651 void redirty_logged_cards(); |
12080 | 1652 // Verification |
1653 | |
1654 // The following is just to alert the verification code | |
1655 // that a full collection has occurred and that the | |
1656 // remembered sets are no longer up to date. | |
1657 bool _full_collection; | |
1658 void set_full_collection() { _full_collection = true;} | |
1659 void clear_full_collection() {_full_collection = false;} | |
1660 bool full_collection() {return _full_collection;} | |
1661 | |
1662 // Perform any cleanup actions necessary before allowing a verification. | |
1663 virtual void prepare_for_verify(); | |
1664 | |
1665 // Perform verification. | |
1666 | |
1667 // vo == UsePrevMarking -> use "prev" marking information, | |
1668 // vo == UseNextMarking -> use "next" marking information | |
1669 // vo == UseMarkWord -> use the mark word in the object header | |
1670 // | |
1671 // NOTE: Only the "prev" marking information is guaranteed to be | |
1672 // consistent most of the time, so most calls to this should use | |
1673 // vo == UsePrevMarking. | |
1674 // Currently, there is only one case where this is called with | |
1675 // vo == UseNextMarking, which is to verify the "next" marking | |
1676 // information at the end of remark. | |
1677 // Currently there is only one place where this is called with | |
1678 // vo == UseMarkWord, which is to verify the marking during a | |
1679 // full GC. | |
1680 void verify(bool silent, VerifyOption vo); | |
1681 | |
1682 // Override; it uses the "prev" marking information | |
1683 virtual void verify(bool silent); | |
1684 | |
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1685 // The methods below are here for convenience and dispatch the |
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1686 // appropriate method depending on value of the given VerifyOption |
12080 | 1687 // parameter. The values for that parameter, and their meanings, |
1688 // are the same as those above. | |
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1689 |
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1690 bool is_obj_dead_cond(const oop obj, |
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1691 const HeapRegion* hr, |
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1692 const VerifyOption vo) const; |
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1693 |
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1694 bool is_obj_dead_cond(const oop obj, |
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1695 const VerifyOption vo) const; |
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1696 |
12080 | 1697 // Printing |
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1698 |
12080 | 1699 virtual void print_on(outputStream* st) const; |
1700 virtual void print_extended_on(outputStream* st) const; | |
1701 virtual void print_on_error(outputStream* st) const; | |
342 | 1702 |
12080 | 1703 virtual void print_gc_threads_on(outputStream* st) const; |
1704 virtual void gc_threads_do(ThreadClosure* tc) const; | |
342 | 1705 |
12080 | 1706 // Override |
1707 void print_tracing_info() const; | |
1708 | |
1709 // The following two methods are helpful for debugging RSet issues. | |
1710 void print_cset_rsets() PRODUCT_RETURN; | |
1711 void print_all_rsets() PRODUCT_RETURN; | |
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1712 |
342 | 1713 public: |
1714 size_t pending_card_num(); | |
1715 size_t cards_scanned(); | |
1716 | |
1717 protected: | |
1718 size_t _max_heap_capacity; | |
1719 }; | |
1720 | |
1972 | 1721 #endif // SHARE_VM_GC_IMPLEMENTATION_G1_G1COLLECTEDHEAP_HPP |