Mercurial > hg > graal-compiler
annotate src/share/vm/gc_implementation/g1/g1CollectedHeap.hpp @ 3980:8229bd737950
7075646: G1: fix inconsistencies in the monitoring data
Summary: Fixed a few inconsistencies in the monitoring data, in particular when reported from jstat.
Reviewed-by: jmasa, brutisso, johnc
author | tonyp |
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date | Fri, 23 Sep 2011 16:07:49 -0400 |
parents | 4dfb2df418f2 |
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342 | 1 /* |
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2 * Copyright (c) 2001, 2011, Oracle and/or its affiliates. All rights reserved. |
342 | 3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
4 * | |
5 * This code is free software; you can redistribute it and/or modify it | |
6 * under the terms of the GNU General Public License version 2 only, as | |
7 * published by the Free Software Foundation. | |
8 * | |
9 * This code is distributed in the hope that it will be useful, but WITHOUT | |
10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or | |
11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License | |
12 * version 2 for more details (a copy is included in the LICENSE file that | |
13 * accompanied this code). | |
14 * | |
15 * You should have received a copy of the GNU General Public License version | |
16 * 2 along with this work; if not, write to the Free Software Foundation, | |
17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. | |
18 * | |
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19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
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20 * or visit www.oracle.com if you need additional information or have any |
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21 * questions. |
342 | 22 * |
23 */ | |
24 | |
1972 | 25 #ifndef SHARE_VM_GC_IMPLEMENTATION_G1_G1COLLECTEDHEAP_HPP |
26 #define SHARE_VM_GC_IMPLEMENTATION_G1_G1COLLECTEDHEAP_HPP | |
27 | |
28 #include "gc_implementation/g1/concurrentMark.hpp" | |
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29 #include "gc_implementation/g1/g1AllocRegion.hpp" |
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30 #include "gc_implementation/g1/g1HRPrinter.hpp" |
1972 | 31 #include "gc_implementation/g1/g1RemSet.hpp" |
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32 #include "gc_implementation/g1/g1MonitoringSupport.hpp" |
3766 | 33 #include "gc_implementation/g1/heapRegionSeq.hpp" |
2152 | 34 #include "gc_implementation/g1/heapRegionSets.hpp" |
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35 #include "gc_implementation/shared/hSpaceCounters.hpp" |
1972 | 36 #include "gc_implementation/parNew/parGCAllocBuffer.hpp" |
37 #include "memory/barrierSet.hpp" | |
38 #include "memory/memRegion.hpp" | |
39 #include "memory/sharedHeap.hpp" | |
40 | |
342 | 41 // A "G1CollectedHeap" is an implementation of a java heap for HotSpot. |
42 // It uses the "Garbage First" heap organization and algorithm, which | |
43 // may combine concurrent marking with parallel, incremental compaction of | |
44 // heap subsets that will yield large amounts of garbage. | |
45 | |
46 class HeapRegion; | |
2173 | 47 class HRRSCleanupTask; |
342 | 48 class PermanentGenerationSpec; |
49 class GenerationSpec; | |
50 class OopsInHeapRegionClosure; | |
51 class G1ScanHeapEvacClosure; | |
52 class ObjectClosure; | |
53 class SpaceClosure; | |
54 class CompactibleSpaceClosure; | |
55 class Space; | |
56 class G1CollectorPolicy; | |
57 class GenRemSet; | |
58 class G1RemSet; | |
59 class HeapRegionRemSetIterator; | |
60 class ConcurrentMark; | |
61 class ConcurrentMarkThread; | |
62 class ConcurrentG1Refine; | |
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63 class GenerationCounters; |
342 | 64 |
1709 | 65 typedef OverflowTaskQueue<StarTask> RefToScanQueue; |
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66 typedef GenericTaskQueueSet<RefToScanQueue> RefToScanQueueSet; |
342 | 67 |
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68 typedef int RegionIdx_t; // needs to hold [ 0..max_regions() ) |
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69 typedef int CardIdx_t; // needs to hold [ 0..CardsPerRegion ) |
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70 |
342 | 71 enum GCAllocPurpose { |
72 GCAllocForTenured, | |
73 GCAllocForSurvived, | |
74 GCAllocPurposeCount | |
75 }; | |
76 | |
77 class YoungList : public CHeapObj { | |
78 private: | |
79 G1CollectedHeap* _g1h; | |
80 | |
81 HeapRegion* _head; | |
82 | |
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83 HeapRegion* _survivor_head; |
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84 HeapRegion* _survivor_tail; |
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85 |
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86 HeapRegion* _curr; |
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87 |
342 | 88 size_t _length; |
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89 size_t _survivor_length; |
342 | 90 |
91 size_t _last_sampled_rs_lengths; | |
92 size_t _sampled_rs_lengths; | |
93 | |
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94 void empty_list(HeapRegion* list); |
342 | 95 |
96 public: | |
97 YoungList(G1CollectedHeap* g1h); | |
98 | |
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99 void push_region(HeapRegion* hr); |
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100 void add_survivor_region(HeapRegion* hr); |
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101 |
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102 void empty_list(); |
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103 bool is_empty() { return _length == 0; } |
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104 size_t length() { return _length; } |
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105 size_t survivor_length() { return _survivor_length; } |
342 | 106 |
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107 // Currently we do not keep track of the used byte sum for the |
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108 // young list and the survivors and it'd be quite a lot of work to |
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109 // do so. When we'll eventually replace the young list with |
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110 // instances of HeapRegionLinkedList we'll get that for free. So, |
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111 // we'll report the more accurate information then. |
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112 size_t eden_used_bytes() { |
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113 assert(length() >= survivor_length(), "invariant"); |
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114 return (length() - survivor_length()) * HeapRegion::GrainBytes; |
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115 } |
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116 size_t survivor_used_bytes() { |
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117 return survivor_length() * HeapRegion::GrainBytes; |
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118 } |
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119 |
342 | 120 void rs_length_sampling_init(); |
121 bool rs_length_sampling_more(); | |
122 void rs_length_sampling_next(); | |
123 | |
124 void reset_sampled_info() { | |
125 _last_sampled_rs_lengths = 0; | |
126 } | |
127 size_t sampled_rs_lengths() { return _last_sampled_rs_lengths; } | |
128 | |
129 // for development purposes | |
130 void reset_auxilary_lists(); | |
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131 void clear() { _head = NULL; _length = 0; } |
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132 |
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133 void clear_survivors() { |
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134 _survivor_head = NULL; |
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135 _survivor_tail = NULL; |
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136 _survivor_length = 0; |
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137 } |
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138 |
342 | 139 HeapRegion* first_region() { return _head; } |
140 HeapRegion* first_survivor_region() { return _survivor_head; } | |
545 | 141 HeapRegion* last_survivor_region() { return _survivor_tail; } |
342 | 142 |
143 // debugging | |
144 bool check_list_well_formed(); | |
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145 bool check_list_empty(bool check_sample = true); |
342 | 146 void print(); |
147 }; | |
148 | |
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149 class MutatorAllocRegion : public G1AllocRegion { |
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150 protected: |
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151 virtual HeapRegion* allocate_new_region(size_t word_size, bool force); |
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152 virtual void retire_region(HeapRegion* alloc_region, size_t allocated_bytes); |
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153 public: |
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154 MutatorAllocRegion() |
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155 : G1AllocRegion("Mutator Alloc Region", false /* bot_updates */) { } |
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156 }; |
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157 |
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158 // The G1 STW is alive closure. |
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159 // An instance is embedded into the G1CH and used as the |
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160 // (optional) _is_alive_non_header closure in the STW |
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161 // reference processor. It is also extensively used during |
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162 // refence processing during STW evacuation pauses. |
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163 class G1STWIsAliveClosure: public BoolObjectClosure { |
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164 G1CollectedHeap* _g1; |
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165 public: |
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166 G1STWIsAliveClosure(G1CollectedHeap* g1) : _g1(g1) {} |
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167 void do_object(oop p) { assert(false, "Do not call."); } |
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168 bool do_object_b(oop p); |
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169 }; |
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170 |
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171 class SurvivorGCAllocRegion : public G1AllocRegion { |
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172 protected: |
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173 virtual HeapRegion* allocate_new_region(size_t word_size, bool force); |
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174 virtual void retire_region(HeapRegion* alloc_region, size_t allocated_bytes); |
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175 public: |
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176 SurvivorGCAllocRegion() |
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177 : G1AllocRegion("Survivor GC Alloc Region", false /* bot_updates */) { } |
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178 }; |
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179 |
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180 class OldGCAllocRegion : public G1AllocRegion { |
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181 protected: |
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182 virtual HeapRegion* allocate_new_region(size_t word_size, bool force); |
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183 virtual void retire_region(HeapRegion* alloc_region, size_t allocated_bytes); |
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184 public: |
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185 OldGCAllocRegion() |
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186 : G1AllocRegion("Old GC Alloc Region", true /* bot_updates */) { } |
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187 }; |
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188 |
342 | 189 class RefineCardTableEntryClosure; |
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190 |
342 | 191 class G1CollectedHeap : public SharedHeap { |
192 friend class VM_G1CollectForAllocation; | |
193 friend class VM_GenCollectForPermanentAllocation; | |
194 friend class VM_G1CollectFull; | |
195 friend class VM_G1IncCollectionPause; | |
196 friend class VMStructs; | |
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197 friend class MutatorAllocRegion; |
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198 friend class SurvivorGCAllocRegion; |
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199 friend class OldGCAllocRegion; |
342 | 200 |
201 // Closures used in implementation. | |
202 friend class G1ParCopyHelper; | |
203 friend class G1IsAliveClosure; | |
204 friend class G1EvacuateFollowersClosure; | |
205 friend class G1ParScanThreadState; | |
206 friend class G1ParScanClosureSuper; | |
207 friend class G1ParEvacuateFollowersClosure; | |
208 friend class G1ParTask; | |
209 friend class G1FreeGarbageRegionClosure; | |
210 friend class RefineCardTableEntryClosure; | |
211 friend class G1PrepareCompactClosure; | |
212 friend class RegionSorter; | |
2152 | 213 friend class RegionResetter; |
342 | 214 friend class CountRCClosure; |
215 friend class EvacPopObjClosure; | |
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216 friend class G1ParCleanupCTTask; |
342 | 217 |
218 // Other related classes. | |
219 friend class G1MarkSweep; | |
220 | |
221 private: | |
222 // The one and only G1CollectedHeap, so static functions can find it. | |
223 static G1CollectedHeap* _g1h; | |
224 | |
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225 static size_t _humongous_object_threshold_in_words; |
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226 |
342 | 227 // Storage for the G1 heap (excludes the permanent generation). |
228 VirtualSpace _g1_storage; | |
229 MemRegion _g1_reserved; | |
230 | |
231 // The part of _g1_storage that is currently committed. | |
232 MemRegion _g1_committed; | |
233 | |
2152 | 234 // The master free list. It will satisfy all new region allocations. |
235 MasterFreeRegionList _free_list; | |
236 | |
237 // The secondary free list which contains regions that have been | |
238 // freed up during the cleanup process. This will be appended to the | |
239 // master free list when appropriate. | |
240 SecondaryFreeRegionList _secondary_free_list; | |
241 | |
242 // It keeps track of the humongous regions. | |
243 MasterHumongousRegionSet _humongous_set; | |
342 | 244 |
245 // The number of regions we could create by expansion. | |
246 size_t _expansion_regions; | |
247 | |
248 // The block offset table for the G1 heap. | |
249 G1BlockOffsetSharedArray* _bot_shared; | |
250 | |
251 // Move all of the regions off the free lists, then rebuild those free | |
252 // lists, before and after full GC. | |
253 void tear_down_region_lists(); | |
254 void rebuild_region_lists(); | |
255 | |
256 // The sequence of all heap regions in the heap. | |
3766 | 257 HeapRegionSeq _hrs; |
342 | 258 |
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259 // Alloc region used to satisfy mutator allocation requests. |
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260 MutatorAllocRegion _mutator_alloc_region; |
342 | 261 |
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262 // Alloc region used to satisfy allocation requests by the GC for |
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263 // survivor objects. |
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264 SurvivorGCAllocRegion _survivor_gc_alloc_region; |
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265 |
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266 // Alloc region used to satisfy allocation requests by the GC for |
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267 // old objects. |
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268 OldGCAllocRegion _old_gc_alloc_region; |
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269 |
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270 // The last old region we allocated to during the last GC. |
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271 // Typically, it is not full so we should re-use it during the next GC. |
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272 HeapRegion* _retained_old_gc_alloc_region; |
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273 |
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274 // It resets the mutator alloc region before new allocations can take place. |
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275 void init_mutator_alloc_region(); |
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276 |
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277 // It releases the mutator alloc region. |
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278 void release_mutator_alloc_region(); |
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279 |
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280 // It initializes the GC alloc regions at the start of a GC. |
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281 void init_gc_alloc_regions(); |
342 | 282 |
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283 // It releases the GC alloc regions at the end of a GC. |
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284 void release_gc_alloc_regions(); |
342 | 285 |
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286 // It does any cleanup that needs to be done on the GC alloc regions |
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287 // before a Full GC. |
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288 void abandon_gc_alloc_regions(); |
342 | 289 |
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290 // Helper for monitoring and management support. |
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291 G1MonitoringSupport* _g1mm; |
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292 |
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293 // Determines PLAB size for a particular allocation purpose. |
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294 static size_t desired_plab_sz(GCAllocPurpose purpose); |
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295 |
342 | 296 // Outside of GC pauses, the number of bytes used in all regions other |
297 // than the current allocation region. | |
298 size_t _summary_bytes_used; | |
299 | |
526 | 300 // This is used for a quick test on whether a reference points into |
301 // the collection set or not. Basically, we have an array, with one | |
302 // byte per region, and that byte denotes whether the corresponding | |
303 // region is in the collection set or not. The entry corresponding | |
304 // the bottom of the heap, i.e., region 0, is pointed to by | |
305 // _in_cset_fast_test_base. The _in_cset_fast_test field has been | |
306 // biased so that it actually points to address 0 of the address | |
307 // space, to make the test as fast as possible (we can simply shift | |
308 // the address to address into it, instead of having to subtract the | |
309 // bottom of the heap from the address before shifting it; basically | |
310 // it works in the same way the card table works). | |
311 bool* _in_cset_fast_test; | |
312 | |
313 // The allocated array used for the fast test on whether a reference | |
314 // points into the collection set or not. This field is also used to | |
315 // free the array. | |
316 bool* _in_cset_fast_test_base; | |
317 | |
318 // The length of the _in_cset_fast_test_base array. | |
319 size_t _in_cset_fast_test_length; | |
320 | |
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321 volatile unsigned _gc_time_stamp; |
342 | 322 |
323 size_t* _surviving_young_words; | |
324 | |
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325 G1HRPrinter _hr_printer; |
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326 |
342 | 327 void setup_surviving_young_words(); |
328 void update_surviving_young_words(size_t* surv_young_words); | |
329 void cleanup_surviving_young_words(); | |
330 | |
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331 // It decides whether an explicit GC should start a concurrent cycle |
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332 // instead of doing a STW GC. Currently, a concurrent cycle is |
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333 // explicitly started if: |
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334 // (a) cause == _gc_locker and +GCLockerInvokesConcurrent, or |
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335 // (b) cause == _java_lang_system_gc and +ExplicitGCInvokesConcurrent. |
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336 bool should_do_concurrent_full_gc(GCCause::Cause cause); |
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337 |
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338 // Keeps track of how many "full collections" (i.e., Full GCs or |
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339 // concurrent cycles) we have completed. The number of them we have |
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340 // started is maintained in _total_full_collections in CollectedHeap. |
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341 volatile unsigned int _full_collections_completed; |
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342 |
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343 // This is a non-product method that is helpful for testing. It is |
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344 // called at the end of a GC and artificially expands the heap by |
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345 // allocating a number of dead regions. This way we can induce very |
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346 // frequent marking cycles and stress the cleanup / concurrent |
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347 // cleanup code more (as all the regions that will be allocated by |
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348 // this method will be found dead by the marking cycle). |
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349 void allocate_dummy_regions() PRODUCT_RETURN; |
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350 |
1973 | 351 // These are macros so that, if the assert fires, we get the correct |
352 // line number, file, etc. | |
353 | |
2361 | 354 #define heap_locking_asserts_err_msg(_extra_message_) \ |
2152 | 355 err_msg("%s : Heap_lock locked: %s, at safepoint: %s, is VM thread: %s", \ |
2361 | 356 (_extra_message_), \ |
2152 | 357 BOOL_TO_STR(Heap_lock->owned_by_self()), \ |
358 BOOL_TO_STR(SafepointSynchronize::is_at_safepoint()), \ | |
359 BOOL_TO_STR(Thread::current()->is_VM_thread())) | |
1973 | 360 |
361 #define assert_heap_locked() \ | |
362 do { \ | |
363 assert(Heap_lock->owned_by_self(), \ | |
364 heap_locking_asserts_err_msg("should be holding the Heap_lock")); \ | |
365 } while (0) | |
366 | |
2361 | 367 #define assert_heap_locked_or_at_safepoint(_should_be_vm_thread_) \ |
1973 | 368 do { \ |
369 assert(Heap_lock->owned_by_self() || \ | |
2152 | 370 (SafepointSynchronize::is_at_safepoint() && \ |
2361 | 371 ((_should_be_vm_thread_) == Thread::current()->is_VM_thread())), \ |
1973 | 372 heap_locking_asserts_err_msg("should be holding the Heap_lock or " \ |
373 "should be at a safepoint")); \ | |
374 } while (0) | |
375 | |
376 #define assert_heap_locked_and_not_at_safepoint() \ | |
377 do { \ | |
378 assert(Heap_lock->owned_by_self() && \ | |
379 !SafepointSynchronize::is_at_safepoint(), \ | |
380 heap_locking_asserts_err_msg("should be holding the Heap_lock and " \ | |
381 "should not be at a safepoint")); \ | |
382 } while (0) | |
383 | |
384 #define assert_heap_not_locked() \ | |
385 do { \ | |
386 assert(!Heap_lock->owned_by_self(), \ | |
387 heap_locking_asserts_err_msg("should not be holding the Heap_lock")); \ | |
388 } while (0) | |
389 | |
390 #define assert_heap_not_locked_and_not_at_safepoint() \ | |
391 do { \ | |
392 assert(!Heap_lock->owned_by_self() && \ | |
393 !SafepointSynchronize::is_at_safepoint(), \ | |
394 heap_locking_asserts_err_msg("should not be holding the Heap_lock and " \ | |
395 "should not be at a safepoint")); \ | |
396 } while (0) | |
397 | |
2361 | 398 #define assert_at_safepoint(_should_be_vm_thread_) \ |
1973 | 399 do { \ |
2152 | 400 assert(SafepointSynchronize::is_at_safepoint() && \ |
2361 | 401 ((_should_be_vm_thread_) == Thread::current()->is_VM_thread()), \ |
1973 | 402 heap_locking_asserts_err_msg("should be at a safepoint")); \ |
403 } while (0) | |
404 | |
405 #define assert_not_at_safepoint() \ | |
406 do { \ | |
407 assert(!SafepointSynchronize::is_at_safepoint(), \ | |
408 heap_locking_asserts_err_msg("should not be at a safepoint")); \ | |
409 } while (0) | |
410 | |
342 | 411 protected: |
412 | |
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413 // The young region list. |
342 | 414 YoungList* _young_list; |
415 | |
416 // The current policy object for the collector. | |
417 G1CollectorPolicy* _g1_policy; | |
418 | |
2152 | 419 // This is the second level of trying to allocate a new region. If |
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420 // new_region() didn't find a region on the free_list, this call will |
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421 // check whether there's anything available on the |
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422 // secondary_free_list and/or wait for more regions to appear on |
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423 // that list, if _free_regions_coming is set. |
2361 | 424 HeapRegion* new_region_try_secondary_free_list(); |
342 | 425 |
2361 | 426 // Try to allocate a single non-humongous HeapRegion sufficient for |
427 // an allocation of the given word_size. If do_expand is true, | |
428 // attempt to expand the heap if necessary to satisfy the allocation | |
429 // request. | |
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430 HeapRegion* new_region(size_t word_size, bool do_expand); |
342 | 431 |
2361 | 432 // Attempt to satisfy a humongous allocation request of the given |
433 // size by finding a contiguous set of free regions of num_regions | |
434 // length and remove them from the master free list. Return the | |
3766 | 435 // index of the first region or G1_NULL_HRS_INDEX if the search |
436 // was unsuccessful. | |
437 size_t humongous_obj_allocate_find_first(size_t num_regions, | |
438 size_t word_size); | |
342 | 439 |
2361 | 440 // Initialize a contiguous set of free regions of length num_regions |
441 // and starting at index first so that they appear as a single | |
442 // humongous region. | |
3766 | 443 HeapWord* humongous_obj_allocate_initialize_regions(size_t first, |
2361 | 444 size_t num_regions, |
445 size_t word_size); | |
446 | |
447 // Attempt to allocate a humongous object of the given size. Return | |
448 // NULL if unsuccessful. | |
2152 | 449 HeapWord* humongous_obj_allocate(size_t word_size); |
1973 | 450 |
451 // The following two methods, allocate_new_tlab() and | |
452 // mem_allocate(), are the two main entry points from the runtime | |
453 // into the G1's allocation routines. They have the following | |
454 // assumptions: | |
455 // | |
456 // * They should both be called outside safepoints. | |
457 // | |
458 // * They should both be called without holding the Heap_lock. | |
459 // | |
460 // * All allocation requests for new TLABs should go to | |
461 // allocate_new_tlab(). | |
462 // | |
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463 // * All non-TLAB allocation requests should go to mem_allocate(). |
1973 | 464 // |
465 // * If either call cannot satisfy the allocation request using the | |
466 // current allocating region, they will try to get a new one. If | |
467 // this fails, they will attempt to do an evacuation pause and | |
468 // retry the allocation. | |
469 // | |
470 // * If all allocation attempts fail, even after trying to schedule | |
471 // an evacuation pause, allocate_new_tlab() will return NULL, | |
472 // whereas mem_allocate() will attempt a heap expansion and/or | |
473 // schedule a Full GC. | |
474 // | |
475 // * We do not allow humongous-sized TLABs. So, allocate_new_tlab | |
476 // should never be called with word_size being humongous. All | |
477 // humongous allocation requests should go to mem_allocate() which | |
478 // will satisfy them with a special path. | |
479 | |
480 virtual HeapWord* allocate_new_tlab(size_t word_size); | |
481 | |
482 virtual HeapWord* mem_allocate(size_t word_size, | |
483 bool* gc_overhead_limit_was_exceeded); | |
342 | 484 |
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485 // The following three methods take a gc_count_before_ret |
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486 // parameter which is used to return the GC count if the method |
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487 // returns NULL. Given that we are required to read the GC count |
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488 // while holding the Heap_lock, and these paths will take the |
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489 // Heap_lock at some point, it's easier to get them to read the GC |
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490 // count while holding the Heap_lock before they return NULL instead |
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491 // of the caller (namely: mem_allocate()) having to also take the |
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492 // Heap_lock just to read the GC count. |
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493 |
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494 // First-level mutator allocation attempt: try to allocate out of |
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495 // the mutator alloc region without taking the Heap_lock. This |
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496 // should only be used for non-humongous allocations. |
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497 inline HeapWord* attempt_allocation(size_t word_size, |
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498 unsigned int* gc_count_before_ret); |
342 | 499 |
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500 // Second-level mutator allocation attempt: take the Heap_lock and |
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501 // retry the allocation attempt, potentially scheduling a GC |
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502 // pause. This should only be used for non-humongous allocations. |
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503 HeapWord* attempt_allocation_slow(size_t word_size, |
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504 unsigned int* gc_count_before_ret); |
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505 |
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506 // Takes the Heap_lock and attempts a humongous allocation. It can |
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507 // potentially schedule a GC pause. |
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508 HeapWord* attempt_allocation_humongous(size_t word_size, |
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509 unsigned int* gc_count_before_ret); |
1973 | 510 |
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511 // Allocation attempt that should be called during safepoints (e.g., |
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512 // at the end of a successful GC). expect_null_mutator_alloc_region |
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513 // specifies whether the mutator alloc region is expected to be NULL |
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514 // or not. |
1973 | 515 HeapWord* attempt_allocation_at_safepoint(size_t word_size, |
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516 bool expect_null_mutator_alloc_region); |
1973 | 517 |
518 // It dirties the cards that cover the block so that so that the post | |
519 // write barrier never queues anything when updating objects on this | |
520 // block. It is assumed (and in fact we assert) that the block | |
521 // belongs to a young region. | |
522 inline void dirty_young_block(HeapWord* start, size_t word_size); | |
342 | 523 |
524 // Allocate blocks during garbage collection. Will ensure an | |
525 // allocation region, either by picking one or expanding the | |
526 // heap, and then allocate a block of the given size. The block | |
527 // may not be a humongous - it must fit into a single heap region. | |
528 HeapWord* par_allocate_during_gc(GCAllocPurpose purpose, size_t word_size); | |
529 | |
530 HeapWord* allocate_during_gc_slow(GCAllocPurpose purpose, | |
531 HeapRegion* alloc_region, | |
532 bool par, | |
533 size_t word_size); | |
534 | |
535 // Ensure that no further allocations can happen in "r", bearing in mind | |
536 // that parallel threads might be attempting allocations. | |
537 void par_allocate_remaining_space(HeapRegion* r); | |
538 | |
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539 // Allocation attempt during GC for a survivor object / PLAB. |
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540 inline HeapWord* survivor_attempt_allocation(size_t word_size); |
545 | 541 |
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542 // Allocation attempt during GC for an old object / PLAB. |
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543 inline HeapWord* old_attempt_allocation(size_t word_size); |
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544 |
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545 // These methods are the "callbacks" from the G1AllocRegion class. |
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546 |
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547 // For mutator alloc regions. |
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548 HeapRegion* new_mutator_alloc_region(size_t word_size, bool force); |
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549 void retire_mutator_alloc_region(HeapRegion* alloc_region, |
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550 size_t allocated_bytes); |
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551 |
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552 // For GC alloc regions. |
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553 HeapRegion* new_gc_alloc_region(size_t word_size, size_t count, |
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554 GCAllocPurpose ap); |
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555 void retire_gc_alloc_region(HeapRegion* alloc_region, |
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556 size_t allocated_bytes, GCAllocPurpose ap); |
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557 |
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558 // - if explicit_gc is true, the GC is for a System.gc() or a heap |
1973 | 559 // inspection request and should collect the entire heap |
560 // - if clear_all_soft_refs is true, all soft references should be | |
561 // cleared during the GC | |
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562 // - if explicit_gc is false, word_size describes the allocation that |
1973 | 563 // the GC should attempt (at least) to satisfy |
564 // - it returns false if it is unable to do the collection due to the | |
565 // GC locker being active, true otherwise | |
566 bool do_collection(bool explicit_gc, | |
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567 bool clear_all_soft_refs, |
342 | 568 size_t word_size); |
569 | |
570 // Callback from VM_G1CollectFull operation. | |
571 // Perform a full collection. | |
572 void do_full_collection(bool clear_all_soft_refs); | |
573 | |
574 // Resize the heap if necessary after a full collection. If this is | |
575 // after a collect-for allocation, "word_size" is the allocation size, | |
576 // and will be considered part of the used portion of the heap. | |
577 void resize_if_necessary_after_full_collection(size_t word_size); | |
578 | |
579 // Callback from VM_G1CollectForAllocation operation. | |
580 // This function does everything necessary/possible to satisfy a | |
581 // failed allocation request (including collection, expansion, etc.) | |
1973 | 582 HeapWord* satisfy_failed_allocation(size_t word_size, bool* succeeded); |
342 | 583 |
584 // Attempting to expand the heap sufficiently | |
585 // to support an allocation of the given "word_size". If | |
586 // successful, perform the allocation and return the address of the | |
587 // allocated block, or else "NULL". | |
1973 | 588 HeapWord* expand_and_allocate(size_t word_size); |
342 | 589 |
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590 // Process any reference objects discovered during |
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591 // an incremental evacuation pause. |
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592 void process_discovered_references(); |
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593 |
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594 // Enqueue any remaining discovered references |
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595 // after processing. |
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596 void enqueue_discovered_references(); |
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597 |
342 | 598 public: |
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599 |
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600 G1MonitoringSupport* g1mm() { |
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601 assert(_g1mm != NULL, "should have been initialized"); |
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602 return _g1mm; |
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603 } |
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604 |
342 | 605 // Expand the garbage-first heap by at least the given size (in bytes!). |
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606 // Returns true if the heap was expanded by the requested amount; |
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607 // false otherwise. |
342 | 608 // (Rounds up to a HeapRegion boundary.) |
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609 bool expand(size_t expand_bytes); |
342 | 610 |
611 // Do anything common to GC's. | |
612 virtual void gc_prologue(bool full); | |
613 virtual void gc_epilogue(bool full); | |
614 | |
526 | 615 // We register a region with the fast "in collection set" test. We |
616 // simply set to true the array slot corresponding to this region. | |
617 void register_region_with_in_cset_fast_test(HeapRegion* r) { | |
618 assert(_in_cset_fast_test_base != NULL, "sanity"); | |
619 assert(r->in_collection_set(), "invariant"); | |
3766 | 620 size_t index = r->hrs_index(); |
621 assert(index < _in_cset_fast_test_length, "invariant"); | |
526 | 622 assert(!_in_cset_fast_test_base[index], "invariant"); |
623 _in_cset_fast_test_base[index] = true; | |
624 } | |
625 | |
626 // This is a fast test on whether a reference points into the | |
627 // collection set or not. It does not assume that the reference | |
628 // points into the heap; if it doesn't, it will return false. | |
629 bool in_cset_fast_test(oop obj) { | |
630 assert(_in_cset_fast_test != NULL, "sanity"); | |
631 if (_g1_committed.contains((HeapWord*) obj)) { | |
632 // no need to subtract the bottom of the heap from obj, | |
633 // _in_cset_fast_test is biased | |
634 size_t index = ((size_t) obj) >> HeapRegion::LogOfHRGrainBytes; | |
635 bool ret = _in_cset_fast_test[index]; | |
636 // let's make sure the result is consistent with what the slower | |
637 // test returns | |
638 assert( ret || !obj_in_cs(obj), "sanity"); | |
639 assert(!ret || obj_in_cs(obj), "sanity"); | |
640 return ret; | |
641 } else { | |
642 return false; | |
643 } | |
644 } | |
645 | |
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646 void clear_cset_fast_test() { |
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647 assert(_in_cset_fast_test_base != NULL, "sanity"); |
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648 memset(_in_cset_fast_test_base, false, |
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649 _in_cset_fast_test_length * sizeof(bool)); |
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650 } |
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651 |
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652 // This is called at the end of either a concurrent cycle or a Full |
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653 // GC to update the number of full collections completed. Those two |
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654 // can happen in a nested fashion, i.e., we start a concurrent |
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655 // cycle, a Full GC happens half-way through it which ends first, |
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656 // and then the cycle notices that a Full GC happened and ends |
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657 // too. The concurrent parameter is a boolean to help us do a bit |
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658 // tighter consistency checking in the method. If concurrent is |
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659 // false, the caller is the inner caller in the nesting (i.e., the |
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660 // Full GC). If concurrent is true, the caller is the outer caller |
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661 // in this nesting (i.e., the concurrent cycle). Further nesting is |
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662 // not currently supported. The end of the this call also notifies |
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663 // the FullGCCount_lock in case a Java thread is waiting for a full |
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664 // GC to happen (e.g., it called System.gc() with |
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665 // +ExplicitGCInvokesConcurrent). |
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666 void increment_full_collections_completed(bool concurrent); |
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667 |
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668 unsigned int full_collections_completed() { |
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669 return _full_collections_completed; |
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670 } |
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671 |
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672 G1HRPrinter* hr_printer() { return &_hr_printer; } |
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673 |
342 | 674 protected: |
675 | |
676 // Shrink the garbage-first heap by at most the given size (in bytes!). | |
677 // (Rounds down to a HeapRegion boundary.) | |
678 virtual void shrink(size_t expand_bytes); | |
679 void shrink_helper(size_t expand_bytes); | |
680 | |
1709 | 681 #if TASKQUEUE_STATS |
682 static void print_taskqueue_stats_hdr(outputStream* const st = gclog_or_tty); | |
683 void print_taskqueue_stats(outputStream* const st = gclog_or_tty) const; | |
684 void reset_taskqueue_stats(); | |
685 #endif // TASKQUEUE_STATS | |
686 | |
1973 | 687 // Schedule the VM operation that will do an evacuation pause to |
688 // satisfy an allocation request of word_size. *succeeded will | |
689 // return whether the VM operation was successful (it did do an | |
690 // evacuation pause) or not (another thread beat us to it or the GC | |
691 // locker was active). Given that we should not be holding the | |
692 // Heap_lock when we enter this method, we will pass the | |
693 // gc_count_before (i.e., total_collections()) as a parameter since | |
694 // it has to be read while holding the Heap_lock. Currently, both | |
695 // methods that call do_collection_pause() release the Heap_lock | |
696 // before the call, so it's easy to read gc_count_before just before. | |
697 HeapWord* do_collection_pause(size_t word_size, | |
698 unsigned int gc_count_before, | |
699 bool* succeeded); | |
342 | 700 |
701 // The guts of the incremental collection pause, executed by the vm | |
1973 | 702 // thread. It returns false if it is unable to do the collection due |
703 // to the GC locker being active, true otherwise | |
704 bool do_collection_pause_at_safepoint(double target_pause_time_ms); | |
342 | 705 |
706 // Actually do the work of evacuating the collection set. | |
1973 | 707 void evacuate_collection_set(); |
342 | 708 |
709 // The g1 remembered set of the heap. | |
710 G1RemSet* _g1_rem_set; | |
711 // And it's mod ref barrier set, used to track updates for the above. | |
712 ModRefBarrierSet* _mr_bs; | |
713 | |
616
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714 // A set of cards that cover the objects for which the Rsets should be updated |
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715 // concurrently after the collection. |
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716 DirtyCardQueueSet _dirty_card_queue_set; |
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717 |
342 | 718 // The Heap Region Rem Set Iterator. |
719 HeapRegionRemSetIterator** _rem_set_iterator; | |
720 | |
721 // The closure used to refine a single card. | |
722 RefineCardTableEntryClosure* _refine_cte_cl; | |
723 | |
724 // A function to check the consistency of dirty card logs. | |
725 void check_ct_logs_at_safepoint(); | |
726 | |
1705 | 727 // A DirtyCardQueueSet that is used to hold cards that contain |
728 // references into the current collection set. This is used to | |
729 // update the remembered sets of the regions in the collection | |
730 // set in the event of an evacuation failure. | |
731 DirtyCardQueueSet _into_cset_dirty_card_queue_set; | |
732 | |
342 | 733 // After a collection pause, make the regions in the CS into free |
734 // regions. | |
735 void free_collection_set(HeapRegion* cs_head); | |
736 | |
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737 // Abandon the current collection set without recording policy |
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738 // statistics or updating free lists. |
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739 void abandon_collection_set(HeapRegion* cs_head); |
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740 |
342 | 741 // Applies "scan_non_heap_roots" to roots outside the heap, |
742 // "scan_rs" to roots inside the heap (having done "set_region" to | |
743 // indicate the region in which the root resides), and does "scan_perm" | |
744 // (setting the generation to the perm generation.) If "scan_rs" is | |
745 // NULL, then this step is skipped. The "worker_i" | |
746 // param is for use with parallel roots processing, and should be | |
747 // the "i" of the calling parallel worker thread's work(i) function. | |
748 // In the sequential case this param will be ignored. | |
749 void g1_process_strong_roots(bool collecting_perm_gen, | |
750 SharedHeap::ScanningOption so, | |
751 OopClosure* scan_non_heap_roots, | |
752 OopsInHeapRegionClosure* scan_rs, | |
753 OopsInGenClosure* scan_perm, | |
754 int worker_i); | |
755 | |
756 // Apply "blk" to all the weak roots of the system. These include | |
757 // JNI weak roots, the code cache, system dictionary, symbol table, | |
758 // string table, and referents of reachable weak refs. | |
759 void g1_process_weak_roots(OopClosure* root_closure, | |
760 OopClosure* non_root_closure); | |
761 | |
2361 | 762 // Frees a non-humongous region by initializing its contents and |
2152 | 763 // adding it to the free list that's passed as a parameter (this is |
764 // usually a local list which will be appended to the master free | |
765 // list later). The used bytes of freed regions are accumulated in | |
766 // pre_used. If par is true, the region's RSet will not be freed | |
767 // up. The assumption is that this will be done later. | |
768 void free_region(HeapRegion* hr, | |
769 size_t* pre_used, | |
770 FreeRegionList* free_list, | |
771 bool par); | |
342 | 772 |
2361 | 773 // Frees a humongous region by collapsing it into individual regions |
774 // and calling free_region() for each of them. The freed regions | |
775 // will be added to the free list that's passed as a parameter (this | |
776 // is usually a local list which will be appended to the master free | |
777 // list later). The used bytes of freed regions are accumulated in | |
778 // pre_used. If par is true, the region's RSet will not be freed | |
779 // up. The assumption is that this will be done later. | |
2152 | 780 void free_humongous_region(HeapRegion* hr, |
781 size_t* pre_used, | |
782 FreeRegionList* free_list, | |
783 HumongousRegionSet* humongous_proxy_set, | |
784 bool par); | |
342 | 785 |
3766 | 786 // Notifies all the necessary spaces that the committed space has |
787 // been updated (either expanded or shrunk). It should be called | |
788 // after _g1_storage is updated. | |
789 void update_committed_space(HeapWord* old_end, HeapWord* new_end); | |
790 | |
342 | 791 // The concurrent marker (and the thread it runs in.) |
792 ConcurrentMark* _cm; | |
793 ConcurrentMarkThread* _cmThread; | |
794 bool _mark_in_progress; | |
795 | |
796 // The concurrent refiner. | |
797 ConcurrentG1Refine* _cg1r; | |
798 | |
799 // The parallel task queues | |
800 RefToScanQueueSet *_task_queues; | |
801 | |
802 // True iff a evacuation has failed in the current collection. | |
803 bool _evacuation_failed; | |
804 | |
805 // Set the attribute indicating whether evacuation has failed in the | |
806 // current collection. | |
807 void set_evacuation_failed(bool b) { _evacuation_failed = b; } | |
808 | |
809 // Failed evacuations cause some logical from-space objects to have | |
810 // forwarding pointers to themselves. Reset them. | |
811 void remove_self_forwarding_pointers(); | |
812 | |
813 // When one is non-null, so is the other. Together, they each pair is | |
814 // an object with a preserved mark, and its mark value. | |
815 GrowableArray<oop>* _objs_with_preserved_marks; | |
816 GrowableArray<markOop>* _preserved_marks_of_objs; | |
817 | |
818 // Preserve the mark of "obj", if necessary, in preparation for its mark | |
819 // word being overwritten with a self-forwarding-pointer. | |
820 void preserve_mark_if_necessary(oop obj, markOop m); | |
821 | |
822 // The stack of evac-failure objects left to be scanned. | |
823 GrowableArray<oop>* _evac_failure_scan_stack; | |
824 // The closure to apply to evac-failure objects. | |
825 | |
826 OopsInHeapRegionClosure* _evac_failure_closure; | |
827 // Set the field above. | |
828 void | |
829 set_evac_failure_closure(OopsInHeapRegionClosure* evac_failure_closure) { | |
830 _evac_failure_closure = evac_failure_closure; | |
831 } | |
832 | |
833 // Push "obj" on the scan stack. | |
834 void push_on_evac_failure_scan_stack(oop obj); | |
835 // Process scan stack entries until the stack is empty. | |
836 void drain_evac_failure_scan_stack(); | |
837 // True iff an invocation of "drain_scan_stack" is in progress; to | |
838 // prevent unnecessary recursion. | |
839 bool _drain_in_progress; | |
840 | |
841 // Do any necessary initialization for evacuation-failure handling. | |
842 // "cl" is the closure that will be used to process evac-failure | |
843 // objects. | |
844 void init_for_evac_failure(OopsInHeapRegionClosure* cl); | |
845 // Do any necessary cleanup for evacuation-failure handling data | |
846 // structures. | |
847 void finalize_for_evac_failure(); | |
848 | |
849 // An attempt to evacuate "obj" has failed; take necessary steps. | |
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850 oop handle_evacuation_failure_par(OopsInHeapRegionClosure* cl, oop obj, |
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851 bool should_mark_root); |
342 | 852 void handle_evacuation_failure_common(oop obj, markOop m); |
853 | |
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854 // ("Weak") Reference processing support. |
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855 // |
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856 // G1 has 2 instances of the referece processor class. One |
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857 // (_ref_processor_cm) handles reference object discovery |
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858 // and subsequent processing during concurrent marking cycles. |
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859 // |
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860 // The other (_ref_processor_stw) handles reference object |
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861 // discovery and processing during full GCs and incremental |
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862 // evacuation pauses. |
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863 // |
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864 // During an incremental pause, reference discovery will be |
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865 // temporarily disabled for _ref_processor_cm and will be |
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866 // enabled for _ref_processor_stw. At the end of the evacuation |
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867 // pause references discovered by _ref_processor_stw will be |
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868 // processed and discovery will be disabled. The previous |
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869 // setting for reference object discovery for _ref_processor_cm |
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870 // will be re-instated. |
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871 // |
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872 // At the start of marking: |
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873 // * Discovery by the CM ref processor is verified to be inactive |
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874 // and it's discovered lists are empty. |
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875 // * Discovery by the CM ref processor is then enabled. |
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876 // |
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877 // At the end of marking: |
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878 // * Any references on the CM ref processor's discovered |
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879 // lists are processed (possibly MT). |
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880 // |
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881 // At the start of full GC we: |
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882 // * Disable discovery by the CM ref processor and |
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883 // empty CM ref processor's discovered lists |
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884 // (without processing any entries). |
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885 // * Verify that the STW ref processor is inactive and it's |
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886 // discovered lists are empty. |
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887 // * Temporarily set STW ref processor discovery as single threaded. |
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888 // * Temporarily clear the STW ref processor's _is_alive_non_header |
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889 // field. |
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890 // * Finally enable discovery by the STW ref processor. |
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891 // |
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892 // The STW ref processor is used to record any discovered |
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893 // references during the full GC. |
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894 // |
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895 // At the end of a full GC we: |
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896 // * Enqueue any reference objects discovered by the STW ref processor |
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897 // that have non-live referents. This has the side-effect of |
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898 // making the STW ref processor inactive by disabling discovery. |
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899 // * Verify that the CM ref processor is still inactive |
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900 // and no references have been placed on it's discovered |
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901 // lists (also checked as a precondition during initial marking). |
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902 |
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903 // The (stw) reference processor... |
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904 ReferenceProcessor* _ref_processor_stw; |
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905 |
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906 // During reference object discovery, the _is_alive_non_header |
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907 // closure (if non-null) is applied to the referent object to |
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908 // determine whether the referent is live. If so then the |
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909 // reference object does not need to be 'discovered' and can |
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910 // be treated as a regular oop. This has the benefit of reducing |
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911 // the number of 'discovered' reference objects that need to |
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912 // be processed. |
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913 // |
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914 // Instance of the is_alive closure for embedding into the |
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915 // STW reference processor as the _is_alive_non_header field. |
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916 // Supplying a value for the _is_alive_non_header field is |
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917 // optional but doing so prevents unnecessary additions to |
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918 // the discovered lists during reference discovery. |
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919 G1STWIsAliveClosure _is_alive_closure_stw; |
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920 |
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921 // The (concurrent marking) reference processor... |
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922 ReferenceProcessor* _ref_processor_cm; |
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923 |
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924 // Instance of the concurrent mark is_alive closure for embedding |
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925 // into the Concurrent Marking reference processor as the |
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926 // _is_alive_non_header field. Supplying a value for the |
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927 // _is_alive_non_header field is optional but doing so prevents |
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928 // unnecessary additions to the discovered lists during reference |
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929 // discovery. |
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930 G1CMIsAliveClosure _is_alive_closure_cm; |
342 | 931 |
932 enum G1H_process_strong_roots_tasks { | |
933 G1H_PS_mark_stack_oops_do, | |
934 G1H_PS_refProcessor_oops_do, | |
935 // Leave this one last. | |
936 G1H_PS_NumElements | |
937 }; | |
938 | |
939 SubTasksDone* _process_strong_tasks; | |
940 | |
2152 | 941 volatile bool _free_regions_coming; |
342 | 942 |
943 public: | |
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944 |
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945 SubTasksDone* process_strong_tasks() { return _process_strong_tasks; } |
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946 |
342 | 947 void set_refine_cte_cl_concurrency(bool concurrent); |
948 | |
1709 | 949 RefToScanQueue *task_queue(int i) const; |
342 | 950 |
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951 // A set of cards where updates happened during the GC |
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952 DirtyCardQueueSet& dirty_card_queue_set() { return _dirty_card_queue_set; } |
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953 |
1705 | 954 // A DirtyCardQueueSet that is used to hold cards that contain |
955 // references into the current collection set. This is used to | |
956 // update the remembered sets of the regions in the collection | |
957 // set in the event of an evacuation failure. | |
958 DirtyCardQueueSet& into_cset_dirty_card_queue_set() | |
959 { return _into_cset_dirty_card_queue_set; } | |
960 | |
342 | 961 // Create a G1CollectedHeap with the specified policy. |
962 // Must call the initialize method afterwards. | |
963 // May not return if something goes wrong. | |
964 G1CollectedHeap(G1CollectorPolicy* policy); | |
965 | |
966 // Initialize the G1CollectedHeap to have the initial and | |
967 // maximum sizes, permanent generation, and remembered and barrier sets | |
968 // specified by the policy object. | |
969 jint initialize(); | |
970 | |
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971 // Initialize weak reference processing. |
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972 virtual void ref_processing_init(); |
342 | 973 |
974 void set_par_threads(int t) { | |
975 SharedHeap::set_par_threads(t); | |
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976 _process_strong_tasks->set_n_threads(t); |
342 | 977 } |
978 | |
979 virtual CollectedHeap::Name kind() const { | |
980 return CollectedHeap::G1CollectedHeap; | |
981 } | |
982 | |
983 // The current policy object for the collector. | |
984 G1CollectorPolicy* g1_policy() const { return _g1_policy; } | |
985 | |
986 // Adaptive size policy. No such thing for g1. | |
987 virtual AdaptiveSizePolicy* size_policy() { return NULL; } | |
988 | |
989 // The rem set and barrier set. | |
990 G1RemSet* g1_rem_set() const { return _g1_rem_set; } | |
991 ModRefBarrierSet* mr_bs() const { return _mr_bs; } | |
992 | |
993 // The rem set iterator. | |
994 HeapRegionRemSetIterator* rem_set_iterator(int i) { | |
995 return _rem_set_iterator[i]; | |
996 } | |
997 | |
998 HeapRegionRemSetIterator* rem_set_iterator() { | |
999 return _rem_set_iterator[0]; | |
1000 } | |
1001 | |
1002 unsigned get_gc_time_stamp() { | |
1003 return _gc_time_stamp; | |
1004 } | |
1005 | |
1006 void reset_gc_time_stamp() { | |
1007 _gc_time_stamp = 0; | |
353
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1008 OrderAccess::fence(); |
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1009 } |
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1010 |
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1011 void increment_gc_time_stamp() { |
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1012 ++_gc_time_stamp; |
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1013 OrderAccess::fence(); |
342 | 1014 } |
1015 | |
1705 | 1016 void iterate_dirty_card_closure(CardTableEntryClosure* cl, |
1017 DirtyCardQueue* into_cset_dcq, | |
1018 bool concurrent, int worker_i); | |
342 | 1019 |
1020 // The shared block offset table array. | |
1021 G1BlockOffsetSharedArray* bot_shared() const { return _bot_shared; } | |
1022 | |
3979
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1023 // Reference Processing accessors |
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1024 |
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1025 // The STW reference processor.... |
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1026 ReferenceProcessor* ref_processor_stw() const { return _ref_processor_stw; } |
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1027 |
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1028 // The Concurent Marking reference processor... |
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1029 ReferenceProcessor* ref_processor_cm() const { return _ref_processor_cm; } |
342 | 1030 |
1031 virtual size_t capacity() const; | |
1032 virtual size_t used() const; | |
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1033 // This should be called when we're not holding the heap lock. The |
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1034 // result might be a bit inaccurate. |
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1035 size_t used_unlocked() const; |
342 | 1036 size_t recalculate_used() const; |
1037 | |
1038 // These virtual functions do the actual allocation. | |
1039 // Some heaps may offer a contiguous region for shared non-blocking | |
1040 // allocation, via inlined code (by exporting the address of the top and | |
1041 // end fields defining the extent of the contiguous allocation region.) | |
1042 // But G1CollectedHeap doesn't yet support this. | |
1043 | |
1044 // Return an estimate of the maximum allocation that could be performed | |
1045 // without triggering any collection or expansion activity. In a | |
1046 // generational collector, for example, this is probably the largest | |
1047 // allocation that could be supported (without expansion) in the youngest | |
1048 // generation. It is "unsafe" because no locks are taken; the result | |
1049 // should be treated as an approximation, not a guarantee, for use in | |
1050 // heuristic resizing decisions. | |
1051 virtual size_t unsafe_max_alloc(); | |
1052 | |
1053 virtual bool is_maximal_no_gc() const { | |
1054 return _g1_storage.uncommitted_size() == 0; | |
1055 } | |
1056 | |
1057 // The total number of regions in the heap. | |
3766 | 1058 size_t n_regions() { return _hrs.length(); } |
1059 | |
1060 // The max number of regions in the heap. | |
1061 size_t max_regions() { return _hrs.max_length(); } | |
342 | 1062 |
1063 // The number of regions that are completely free. | |
3766 | 1064 size_t free_regions() { return _free_list.length(); } |
342 | 1065 |
1066 // The number of regions that are not completely free. | |
1067 size_t used_regions() { return n_regions() - free_regions(); } | |
1068 | |
1069 // The number of regions available for "regular" expansion. | |
1070 size_t expansion_regions() { return _expansion_regions; } | |
1071 | |
3766 | 1072 // Factory method for HeapRegion instances. It will return NULL if |
1073 // the allocation fails. | |
1074 HeapRegion* new_heap_region(size_t hrs_index, HeapWord* bottom); | |
1075 | |
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1076 void verify_not_dirty_region(HeapRegion* hr) PRODUCT_RETURN; |
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1077 void verify_dirty_region(HeapRegion* hr) PRODUCT_RETURN; |
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1078 void verify_dirty_young_list(HeapRegion* head) PRODUCT_RETURN; |
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1079 void verify_dirty_young_regions() PRODUCT_RETURN; |
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1080 |
2152 | 1081 // verify_region_sets() performs verification over the region |
1082 // lists. It will be compiled in the product code to be used when | |
1083 // necessary (i.e., during heap verification). | |
1084 void verify_region_sets(); | |
342 | 1085 |
2152 | 1086 // verify_region_sets_optional() is planted in the code for |
1087 // list verification in non-product builds (and it can be enabled in | |
1088 // product builds by definning HEAP_REGION_SET_FORCE_VERIFY to be 1). | |
1089 #if HEAP_REGION_SET_FORCE_VERIFY | |
1090 void verify_region_sets_optional() { | |
1091 verify_region_sets(); | |
1092 } | |
1093 #else // HEAP_REGION_SET_FORCE_VERIFY | |
1094 void verify_region_sets_optional() { } | |
1095 #endif // HEAP_REGION_SET_FORCE_VERIFY | |
342 | 1096 |
2152 | 1097 #ifdef ASSERT |
2361 | 1098 bool is_on_master_free_list(HeapRegion* hr) { |
2152 | 1099 return hr->containing_set() == &_free_list; |
1100 } | |
342 | 1101 |
2361 | 1102 bool is_in_humongous_set(HeapRegion* hr) { |
2152 | 1103 return hr->containing_set() == &_humongous_set; |
2361 | 1104 } |
2152 | 1105 #endif // ASSERT |
342 | 1106 |
2152 | 1107 // Wrapper for the region list operations that can be called from |
1108 // methods outside this class. | |
342 | 1109 |
2152 | 1110 void secondary_free_list_add_as_tail(FreeRegionList* list) { |
1111 _secondary_free_list.add_as_tail(list); | |
1112 } | |
342 | 1113 |
2152 | 1114 void append_secondary_free_list() { |
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1115 _free_list.add_as_head(&_secondary_free_list); |
2152 | 1116 } |
342 | 1117 |
2361 | 1118 void append_secondary_free_list_if_not_empty_with_lock() { |
1119 // If the secondary free list looks empty there's no reason to | |
1120 // take the lock and then try to append it. | |
2152 | 1121 if (!_secondary_free_list.is_empty()) { |
1122 MutexLockerEx x(SecondaryFreeList_lock, Mutex::_no_safepoint_check_flag); | |
1123 append_secondary_free_list(); | |
1124 } | |
1125 } | |
342 | 1126 |
2152 | 1127 void set_free_regions_coming(); |
1128 void reset_free_regions_coming(); | |
1129 bool free_regions_coming() { return _free_regions_coming; } | |
1130 void wait_while_free_regions_coming(); | |
342 | 1131 |
1132 // Perform a collection of the heap; intended for use in implementing | |
1133 // "System.gc". This probably implies as full a collection as the | |
1134 // "CollectedHeap" supports. | |
1135 virtual void collect(GCCause::Cause cause); | |
1136 | |
1137 // The same as above but assume that the caller holds the Heap_lock. | |
1138 void collect_locked(GCCause::Cause cause); | |
1139 | |
1140 // This interface assumes that it's being called by the | |
1141 // vm thread. It collects the heap assuming that the | |
1142 // heap lock is already held and that we are executing in | |
1143 // the context of the vm thread. | |
1144 virtual void collect_as_vm_thread(GCCause::Cause cause); | |
1145 | |
1146 // True iff a evacuation has failed in the most-recent collection. | |
1147 bool evacuation_failed() { return _evacuation_failed; } | |
1148 | |
2152 | 1149 // It will free a region if it has allocated objects in it that are |
1150 // all dead. It calls either free_region() or | |
1151 // free_humongous_region() depending on the type of the region that | |
1152 // is passed to it. | |
2173 | 1153 void free_region_if_empty(HeapRegion* hr, |
1154 size_t* pre_used, | |
1155 FreeRegionList* free_list, | |
1156 HumongousRegionSet* humongous_proxy_set, | |
1157 HRRSCleanupTask* hrrs_cleanup_task, | |
1158 bool par); | |
342 | 1159 |
2152 | 1160 // It appends the free list to the master free list and updates the |
1161 // master humongous list according to the contents of the proxy | |
1162 // list. It also adjusts the total used bytes according to pre_used | |
1163 // (if par is true, it will do so by taking the ParGCRareEvent_lock). | |
1164 void update_sets_after_freeing_regions(size_t pre_used, | |
1165 FreeRegionList* free_list, | |
1166 HumongousRegionSet* humongous_proxy_set, | |
1167 bool par); | |
342 | 1168 |
1169 // Returns "TRUE" iff "p" points into the allocated area of the heap. | |
1170 virtual bool is_in(const void* p) const; | |
1171 | |
1172 // Return "TRUE" iff the given object address is within the collection | |
1173 // set. | |
1174 inline bool obj_in_cs(oop obj); | |
1175 | |
1176 // Return "TRUE" iff the given object address is in the reserved | |
1177 // region of g1 (excluding the permanent generation). | |
1178 bool is_in_g1_reserved(const void* p) const { | |
1179 return _g1_reserved.contains(p); | |
1180 } | |
1181 | |
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1182 // Returns a MemRegion that corresponds to the space that has been |
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1183 // reserved for the heap |
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1184 MemRegion g1_reserved() { |
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1185 return _g1_reserved; |
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1186 } |
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1187 |
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1188 // Returns a MemRegion that corresponds to the space that has been |
342 | 1189 // committed in the heap |
1190 MemRegion g1_committed() { | |
1191 return _g1_committed; | |
1192 } | |
1193 | |
2311 | 1194 virtual bool is_in_closed_subset(const void* p) const; |
342 | 1195 |
1196 // This resets the card table to all zeros. It is used after | |
1197 // a collection pause which used the card table to claim cards. | |
1198 void cleanUpCardTable(); | |
1199 | |
1200 // Iteration functions. | |
1201 | |
1202 // Iterate over all the ref-containing fields of all objects, calling | |
1203 // "cl.do_oop" on each. | |
678 | 1204 virtual void oop_iterate(OopClosure* cl) { |
1205 oop_iterate(cl, true); | |
1206 } | |
1207 void oop_iterate(OopClosure* cl, bool do_perm); | |
342 | 1208 |
1209 // Same as above, restricted to a memory region. | |
678 | 1210 virtual void oop_iterate(MemRegion mr, OopClosure* cl) { |
1211 oop_iterate(mr, cl, true); | |
1212 } | |
1213 void oop_iterate(MemRegion mr, OopClosure* cl, bool do_perm); | |
342 | 1214 |
1215 // Iterate over all objects, calling "cl.do_object" on each. | |
678 | 1216 virtual void object_iterate(ObjectClosure* cl) { |
1217 object_iterate(cl, true); | |
1218 } | |
1219 virtual void safe_object_iterate(ObjectClosure* cl) { | |
1220 object_iterate(cl, true); | |
1221 } | |
1222 void object_iterate(ObjectClosure* cl, bool do_perm); | |
342 | 1223 |
1224 // Iterate over all objects allocated since the last collection, calling | |
1225 // "cl.do_object" on each. The heap must have been initialized properly | |
1226 // to support this function, or else this call will fail. | |
1227 virtual void object_iterate_since_last_GC(ObjectClosure* cl); | |
1228 | |
1229 // Iterate over all spaces in use in the heap, in ascending address order. | |
1230 virtual void space_iterate(SpaceClosure* cl); | |
1231 | |
1232 // Iterate over heap regions, in address order, terminating the | |
1233 // iteration early if the "doHeapRegion" method returns "true". | |
3766 | 1234 void heap_region_iterate(HeapRegionClosure* blk) const; |
342 | 1235 |
1236 // Iterate over heap regions starting with r (or the first region if "r" | |
1237 // is NULL), in address order, terminating early if the "doHeapRegion" | |
1238 // method returns "true". | |
3766 | 1239 void heap_region_iterate_from(HeapRegion* r, HeapRegionClosure* blk) const; |
342 | 1240 |
3766 | 1241 // Return the region with the given index. It assumes the index is valid. |
1242 HeapRegion* region_at(size_t index) const { return _hrs.at(index); } | |
342 | 1243 |
1244 // Divide the heap region sequence into "chunks" of some size (the number | |
1245 // of regions divided by the number of parallel threads times some | |
1246 // overpartition factor, currently 4). Assumes that this will be called | |
1247 // in parallel by ParallelGCThreads worker threads with discinct worker | |
1248 // ids in the range [0..max(ParallelGCThreads-1, 1)], that all parallel | |
1249 // calls will use the same "claim_value", and that that claim value is | |
1250 // different from the claim_value of any heap region before the start of | |
1251 // the iteration. Applies "blk->doHeapRegion" to each of the regions, by | |
1252 // attempting to claim the first region in each chunk, and, if | |
1253 // successful, applying the closure to each region in the chunk (and | |
1254 // setting the claim value of the second and subsequent regions of the | |
1255 // chunk.) For now requires that "doHeapRegion" always returns "false", | |
1256 // i.e., that a closure never attempt to abort a traversal. | |
1257 void heap_region_par_iterate_chunked(HeapRegionClosure* blk, | |
1258 int worker, | |
1259 jint claim_value); | |
1260 | |
390 | 1261 // It resets all the region claim values to the default. |
1262 void reset_heap_region_claim_values(); | |
1263 | |
355 | 1264 #ifdef ASSERT |
1265 bool check_heap_region_claim_values(jint claim_value); | |
1266 #endif // ASSERT | |
1267 | |
342 | 1268 // Iterate over the regions (if any) in the current collection set. |
1269 void collection_set_iterate(HeapRegionClosure* blk); | |
1270 | |
1271 // As above but starting from region r | |
1272 void collection_set_iterate_from(HeapRegion* r, HeapRegionClosure *blk); | |
1273 | |
1274 // Returns the first (lowest address) compactible space in the heap. | |
1275 virtual CompactibleSpace* first_compactible_space(); | |
1276 | |
1277 // A CollectedHeap will contain some number of spaces. This finds the | |
1278 // space containing a given address, or else returns NULL. | |
1279 virtual Space* space_containing(const void* addr) const; | |
1280 | |
1281 // A G1CollectedHeap will contain some number of heap regions. This | |
1282 // finds the region containing a given address, or else returns NULL. | |
3766 | 1283 template <class T> |
1284 inline HeapRegion* heap_region_containing(const T addr) const; | |
342 | 1285 |
1286 // Like the above, but requires "addr" to be in the heap (to avoid a | |
1287 // null-check), and unlike the above, may return an continuing humongous | |
1288 // region. | |
3766 | 1289 template <class T> |
1290 inline HeapRegion* heap_region_containing_raw(const T addr) const; | |
342 | 1291 |
1292 // A CollectedHeap is divided into a dense sequence of "blocks"; that is, | |
1293 // each address in the (reserved) heap is a member of exactly | |
1294 // one block. The defining characteristic of a block is that it is | |
1295 // possible to find its size, and thus to progress forward to the next | |
1296 // block. (Blocks may be of different sizes.) Thus, blocks may | |
1297 // represent Java objects, or they might be free blocks in a | |
1298 // free-list-based heap (or subheap), as long as the two kinds are | |
1299 // distinguishable and the size of each is determinable. | |
1300 | |
1301 // Returns the address of the start of the "block" that contains the | |
1302 // address "addr". We say "blocks" instead of "object" since some heaps | |
1303 // may not pack objects densely; a chunk may either be an object or a | |
1304 // non-object. | |
1305 virtual HeapWord* block_start(const void* addr) const; | |
1306 | |
1307 // Requires "addr" to be the start of a chunk, and returns its size. | |
1308 // "addr + size" is required to be the start of a new chunk, or the end | |
1309 // of the active area of the heap. | |
1310 virtual size_t block_size(const HeapWord* addr) const; | |
1311 | |
1312 // Requires "addr" to be the start of a block, and returns "TRUE" iff | |
1313 // the block is an object. | |
1314 virtual bool block_is_obj(const HeapWord* addr) const; | |
1315 | |
1316 // Does this heap support heap inspection? (+PrintClassHistogram) | |
1317 virtual bool supports_heap_inspection() const { return true; } | |
1318 | |
1319 // Section on thread-local allocation buffers (TLABs) | |
1320 // See CollectedHeap for semantics. | |
1321 | |
1322 virtual bool supports_tlab_allocation() const; | |
1323 virtual size_t tlab_capacity(Thread* thr) const; | |
1324 virtual size_t unsafe_max_tlab_alloc(Thread* thr) const; | |
1325 | |
1326 // Can a compiler initialize a new object without store barriers? | |
1327 // This permission only extends from the creation of a new object | |
1027
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1328 // via a TLAB up to the first subsequent safepoint. If such permission |
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1329 // is granted for this heap type, the compiler promises to call |
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1330 // defer_store_barrier() below on any slow path allocation of |
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1331 // a new object for which such initializing store barriers will |
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1332 // have been elided. G1, like CMS, allows this, but should be |
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1333 // ready to provide a compensating write barrier as necessary |
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1334 // if that storage came out of a non-young region. The efficiency |
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1335 // of this implementation depends crucially on being able to |
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1336 // answer very efficiently in constant time whether a piece of |
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1337 // storage in the heap comes from a young region or not. |
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1338 // See ReduceInitialCardMarks. |
342 | 1339 virtual bool can_elide_tlab_store_barriers() const { |
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1340 // 6920090: Temporarily disabled, because of lingering |
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1341 // instabilities related to RICM with G1. In the |
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1342 // interim, the option ReduceInitialCardMarksForG1 |
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1343 // below is left solely as a debugging device at least |
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1344 // until 6920109 fixes the instabilities. |
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1345 return ReduceInitialCardMarksForG1; |
1027
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1346 } |
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1347 |
1166 | 1348 virtual bool card_mark_must_follow_store() const { |
1349 return true; | |
1350 } | |
1351 | |
3766 | 1352 bool is_in_young(const oop obj) { |
1027
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1353 HeapRegion* hr = heap_region_containing(obj); |
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1354 return hr != NULL && hr->is_young(); |
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1355 } |
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1356 |
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1357 #ifdef ASSERT |
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1358 virtual bool is_in_partial_collection(const void* p); |
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1359 #endif |
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1360 |
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1361 virtual bool is_scavengable(const void* addr); |
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1362 |
1027
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1363 // We don't need barriers for initializing stores to objects |
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1364 // in the young gen: for the SATB pre-barrier, there is no |
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1365 // pre-value that needs to be remembered; for the remembered-set |
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1366 // update logging post-barrier, we don't maintain remembered set |
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1367 // information for young gen objects. |
1027
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1368 virtual bool can_elide_initializing_store_barrier(oop new_obj) { |
1194
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1369 // Re 6920090, 6920109 above. |
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1370 assert(ReduceInitialCardMarksForG1, "Else cannot be here"); |
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1371 return is_in_young(new_obj); |
342 | 1372 } |
1373 | |
1374 // Can a compiler elide a store barrier when it writes | |
1375 // a permanent oop into the heap? Applies when the compiler | |
1376 // is storing x to the heap, where x->is_perm() is true. | |
1377 virtual bool can_elide_permanent_oop_store_barriers() const { | |
1378 // At least until perm gen collection is also G1-ified, at | |
1379 // which point this should return false. | |
1380 return true; | |
1381 } | |
1382 | |
1383 // Returns "true" iff the given word_size is "very large". | |
1384 static bool isHumongous(size_t word_size) { | |
1313
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1385 // Note this has to be strictly greater-than as the TLABs |
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1386 // are capped at the humongous thresold and we want to |
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1387 // ensure that we don't try to allocate a TLAB as |
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1388 // humongous and that we don't allocate a humongous |
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1389 // object in a TLAB. |
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1390 return word_size > _humongous_object_threshold_in_words; |
342 | 1391 } |
1392 | |
1393 // Update mod union table with the set of dirty cards. | |
1394 void updateModUnion(); | |
1395 | |
1396 // Set the mod union bits corresponding to the given memRegion. Note | |
1397 // that this is always a safe operation, since it doesn't clear any | |
1398 // bits. | |
1399 void markModUnionRange(MemRegion mr); | |
1400 | |
1401 // Records the fact that a marking phase is no longer in progress. | |
1402 void set_marking_complete() { | |
1403 _mark_in_progress = false; | |
1404 } | |
1405 void set_marking_started() { | |
1406 _mark_in_progress = true; | |
1407 } | |
1408 bool mark_in_progress() { | |
1409 return _mark_in_progress; | |
1410 } | |
1411 | |
1412 // Print the maximum heap capacity. | |
1413 virtual size_t max_capacity() const; | |
1414 | |
1415 virtual jlong millis_since_last_gc(); | |
1416 | |
1417 // Perform any cleanup actions necessary before allowing a verification. | |
1418 virtual void prepare_for_verify(); | |
1419 | |
1420 // Perform verification. | |
811 | 1421 |
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1422 // vo == UsePrevMarking -> use "prev" marking information, |
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1423 // vo == UseNextMarking -> use "next" marking information |
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1424 // vo == UseMarkWord -> use the mark word in the object header |
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1425 // |
811 | 1426 // NOTE: Only the "prev" marking information is guaranteed to be |
1427 // consistent most of the time, so most calls to this should use | |
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1428 // vo == UsePrevMarking. |
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1429 // Currently, there is only one case where this is called with |
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1430 // vo == UseNextMarking, which is to verify the "next" marking |
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1431 // information at the end of remark. |
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1432 // Currently there is only one place where this is called with |
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1433 // vo == UseMarkWord, which is to verify the marking during a |
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1434 // full GC. |
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1435 void verify(bool allow_dirty, bool silent, VerifyOption vo); |
811 | 1436 |
1437 // Override; it uses the "prev" marking information | |
342 | 1438 virtual void verify(bool allow_dirty, bool silent); |
838
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1439 // Default behavior by calling print(tty); |
342 | 1440 virtual void print() const; |
838
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1441 // This calls print_on(st, PrintHeapAtGCExtended). |
342 | 1442 virtual void print_on(outputStream* st) const; |
838
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1443 // If extended is true, it will print out information for all |
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1444 // regions in the heap by calling print_on_extended(st). |
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1445 virtual void print_on(outputStream* st, bool extended) const; |
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1446 virtual void print_on_extended(outputStream* st) const; |
342 | 1447 |
1448 virtual void print_gc_threads_on(outputStream* st) const; | |
1449 virtual void gc_threads_do(ThreadClosure* tc) const; | |
1450 | |
1451 // Override | |
1452 void print_tracing_info() const; | |
1453 | |
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1454 // The following two methods are helpful for debugging RSet issues. |
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1455 void print_cset_rsets() PRODUCT_RETURN; |
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1456 void print_all_rsets() PRODUCT_RETURN; |
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1457 |
342 | 1458 // Convenience function to be used in situations where the heap type can be |
1459 // asserted to be this type. | |
1460 static G1CollectedHeap* heap(); | |
1461 | |
1462 void empty_young_list(); | |
1463 | |
1464 void set_region_short_lived_locked(HeapRegion* hr); | |
1465 // add appropriate methods for any other surv rate groups | |
1466 | |
1394
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1467 YoungList* young_list() { return _young_list; } |
342 | 1468 |
1469 // debugging | |
1470 bool check_young_list_well_formed() { | |
1471 return _young_list->check_list_well_formed(); | |
1472 } | |
1394
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1473 |
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1474 bool check_young_list_empty(bool check_heap, |
342 | 1475 bool check_sample = true); |
1476 | |
1477 // *** Stuff related to concurrent marking. It's not clear to me that so | |
1478 // many of these need to be public. | |
1479 | |
1480 // The functions below are helper functions that a subclass of | |
1481 // "CollectedHeap" can use in the implementation of its virtual | |
1482 // functions. | |
1483 // This performs a concurrent marking of the live objects in a | |
1484 // bitmap off to the side. | |
1485 void doConcurrentMark(); | |
1486 | |
1487 bool isMarkedPrev(oop obj) const; | |
1488 bool isMarkedNext(oop obj) const; | |
1489 | |
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1490 // vo == UsePrevMarking -> use "prev" marking information, |
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1491 // vo == UseNextMarking -> use "next" marking information, |
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1492 // vo == UseMarkWord -> use mark word from object header |
811 | 1493 bool is_obj_dead_cond(const oop obj, |
1494 const HeapRegion* hr, | |
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1495 const VerifyOption vo) const { |
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1496 |
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1497 switch (vo) { |
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1498 case VerifyOption_G1UsePrevMarking: |
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1499 return is_obj_dead(obj, hr); |
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1500 case VerifyOption_G1UseNextMarking: |
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1501 return is_obj_ill(obj, hr); |
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1502 default: |
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1503 assert(vo == VerifyOption_G1UseMarkWord, "must be"); |
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1504 return !obj->is_gc_marked(); |
811 | 1505 } |
1506 } | |
1507 | |
342 | 1508 // Determine if an object is dead, given the object and also |
1509 // the region to which the object belongs. An object is dead | |
1510 // iff a) it was not allocated since the last mark and b) it | |
1511 // is not marked. | |
1512 | |
1513 bool is_obj_dead(const oop obj, const HeapRegion* hr) const { | |
1514 return | |
1515 !hr->obj_allocated_since_prev_marking(obj) && | |
1516 !isMarkedPrev(obj); | |
1517 } | |
1518 | |
1519 // This is used when copying an object to survivor space. | |
1520 // If the object is marked live, then we mark the copy live. | |
1521 // If the object is allocated since the start of this mark | |
1522 // cycle, then we mark the copy live. | |
1523 // If the object has been around since the previous mark | |
1524 // phase, and hasn't been marked yet during this phase, | |
1525 // then we don't mark it, we just wait for the | |
1526 // current marking cycle to get to it. | |
1527 | |
1528 // This function returns true when an object has been | |
1529 // around since the previous marking and hasn't yet | |
1530 // been marked during this marking. | |
1531 | |
1532 bool is_obj_ill(const oop obj, const HeapRegion* hr) const { | |
1533 return | |
1534 !hr->obj_allocated_since_next_marking(obj) && | |
1535 !isMarkedNext(obj); | |
1536 } | |
1537 | |
1538 // Determine if an object is dead, given only the object itself. | |
1539 // This will find the region to which the object belongs and | |
1540 // then call the region version of the same function. | |
1541 | |
1542 // Added if it is in permanent gen it isn't dead. | |
1543 // Added if it is NULL it isn't dead. | |
1544 | |
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1545 // vo == UsePrevMarking -> use "prev" marking information, |
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1546 // vo == UseNextMarking -> use "next" marking information, |
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1547 // vo == UseMarkWord -> use mark word from object header |
811 | 1548 bool is_obj_dead_cond(const oop obj, |
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1549 const VerifyOption vo) const { |
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1550 |
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1551 switch (vo) { |
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1552 case VerifyOption_G1UsePrevMarking: |
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1553 return is_obj_dead(obj); |
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1554 case VerifyOption_G1UseNextMarking: |
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1555 return is_obj_ill(obj); |
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1556 default: |
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1557 assert(vo == VerifyOption_G1UseMarkWord, "must be"); |
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1558 return !obj->is_gc_marked(); |
811 | 1559 } |
1560 } | |
1561 | |
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1562 bool is_obj_dead(const oop obj) const { |
811 | 1563 const HeapRegion* hr = heap_region_containing(obj); |
342 | 1564 if (hr == NULL) { |
1565 if (Universe::heap()->is_in_permanent(obj)) | |
1566 return false; | |
1567 else if (obj == NULL) return false; | |
1568 else return true; | |
1569 } | |
1570 else return is_obj_dead(obj, hr); | |
1571 } | |
1572 | |
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1573 bool is_obj_ill(const oop obj) const { |
811 | 1574 const HeapRegion* hr = heap_region_containing(obj); |
342 | 1575 if (hr == NULL) { |
1576 if (Universe::heap()->is_in_permanent(obj)) | |
1577 return false; | |
1578 else if (obj == NULL) return false; | |
1579 else return true; | |
1580 } | |
1581 else return is_obj_ill(obj, hr); | |
1582 } | |
1583 | |
1584 // The following is just to alert the verification code | |
1585 // that a full collection has occurred and that the | |
1586 // remembered sets are no longer up to date. | |
1587 bool _full_collection; | |
1588 void set_full_collection() { _full_collection = true;} | |
1589 void clear_full_collection() {_full_collection = false;} | |
1590 bool full_collection() {return _full_collection;} | |
1591 | |
1592 ConcurrentMark* concurrent_mark() const { return _cm; } | |
1593 ConcurrentG1Refine* concurrent_g1_refine() const { return _cg1r; } | |
1594 | |
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1595 // The dirty cards region list is used to record a subset of regions |
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1596 // whose cards need clearing. The list if populated during the |
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1597 // remembered set scanning and drained during the card table |
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1598 // cleanup. Although the methods are reentrant, population/draining |
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1599 // phases must not overlap. For synchronization purposes the last |
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1600 // element on the list points to itself. |
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1601 HeapRegion* _dirty_cards_region_list; |
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1602 void push_dirty_cards_region(HeapRegion* hr); |
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1603 HeapRegion* pop_dirty_cards_region(); |
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1604 |
342 | 1605 public: |
1606 void stop_conc_gc_threads(); | |
1607 | |
1608 // <NEW PREDICTION> | |
1609 | |
1610 double predict_region_elapsed_time_ms(HeapRegion* hr, bool young); | |
1611 void check_if_region_is_too_expensive(double predicted_time_ms); | |
1612 size_t pending_card_num(); | |
1613 size_t max_pending_card_num(); | |
1614 size_t cards_scanned(); | |
1615 | |
1616 // </NEW PREDICTION> | |
1617 | |
1618 protected: | |
1619 size_t _max_heap_capacity; | |
1620 }; | |
1621 | |
845
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1622 #define use_local_bitmaps 1 |
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1623 #define verify_local_bitmaps 0 |
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1624 #define oop_buffer_length 256 |
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1625 |
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1626 #ifndef PRODUCT |
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1627 class GCLabBitMap; |
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1628 class GCLabBitMapClosure: public BitMapClosure { |
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1629 private: |
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1630 ConcurrentMark* _cm; |
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1631 GCLabBitMap* _bitmap; |
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1632 |
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1633 public: |
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1634 GCLabBitMapClosure(ConcurrentMark* cm, |
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1635 GCLabBitMap* bitmap) { |
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1636 _cm = cm; |
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1637 _bitmap = bitmap; |
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1638 } |
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1639 |
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1640 virtual bool do_bit(size_t offset); |
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1641 }; |
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1642 #endif // !PRODUCT |
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1643 |
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1644 class GCLabBitMap: public BitMap { |
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1645 private: |
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1646 ConcurrentMark* _cm; |
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1647 |
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1648 int _shifter; |
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1649 size_t _bitmap_word_covers_words; |
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1650 |
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1651 // beginning of the heap |
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1652 HeapWord* _heap_start; |
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1653 |
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1654 // this is the actual start of the GCLab |
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1655 HeapWord* _real_start_word; |
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1656 |
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1657 // this is the actual end of the GCLab |
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1658 HeapWord* _real_end_word; |
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1659 |
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1660 // this is the first word, possibly located before the actual start |
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1661 // of the GCLab, that corresponds to the first bit of the bitmap |
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1662 HeapWord* _start_word; |
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1663 |
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1664 // size of a GCLab in words |
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1665 size_t _gclab_word_size; |
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1666 |
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1667 static int shifter() { |
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1668 return MinObjAlignment - 1; |
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1669 } |
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1670 |
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1671 // how many heap words does a single bitmap word corresponds to? |
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1672 static size_t bitmap_word_covers_words() { |
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1673 return BitsPerWord << shifter(); |
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|
1674 } |
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1675 |
1391
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|
1676 size_t gclab_word_size() const { |
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|
1677 return _gclab_word_size; |
845
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1678 } |
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1679 |
1391
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1680 // Calculates actual GCLab size in words |
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1681 size_t gclab_real_word_size() const { |
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1682 return bitmap_size_in_bits(pointer_delta(_real_end_word, _start_word)) |
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1683 / BitsPerWord; |
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1684 } |
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|
1685 |
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|
1686 static size_t bitmap_size_in_bits(size_t gclab_word_size) { |
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1687 size_t bits_in_bitmap = gclab_word_size >> shifter(); |
845
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1688 // We are going to ensure that the beginning of a word in this |
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1689 // bitmap also corresponds to the beginning of a word in the |
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1690 // global marking bitmap. To handle the case where a GCLab |
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|
1691 // starts from the middle of the bitmap, we need to add enough |
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1692 // space (i.e. up to a bitmap word) to ensure that we have |
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|
1693 // enough bits in the bitmap. |
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1694 return bits_in_bitmap + BitsPerWord - 1; |
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|
1695 } |
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|
1696 public: |
1391
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1697 GCLabBitMap(HeapWord* heap_start, size_t gclab_word_size) |
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1698 : BitMap(bitmap_size_in_bits(gclab_word_size)), |
845
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|
1699 _cm(G1CollectedHeap::heap()->concurrent_mark()), |
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|
1700 _shifter(shifter()), |
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|
1701 _bitmap_word_covers_words(bitmap_word_covers_words()), |
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|
1702 _heap_start(heap_start), |
1391
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1703 _gclab_word_size(gclab_word_size), |
845
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1704 _real_start_word(NULL), |
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|
1705 _real_end_word(NULL), |
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|
1706 _start_word(NULL) |
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|
1707 { |
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|
1708 guarantee( size_in_words() >= bitmap_size_in_words(), |
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|
1709 "just making sure"); |
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|
1710 } |
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|
1711 |
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|
1712 inline unsigned heapWordToOffset(HeapWord* addr) { |
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1713 unsigned offset = (unsigned) pointer_delta(addr, _start_word) >> _shifter; |
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|
1714 assert(offset < size(), "offset should be within bounds"); |
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|
1715 return offset; |
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|
1716 } |
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|
1717 |
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|
1718 inline HeapWord* offsetToHeapWord(size_t offset) { |
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1719 HeapWord* addr = _start_word + (offset << _shifter); |
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1720 assert(_real_start_word <= addr && addr < _real_end_word, "invariant"); |
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|
1721 return addr; |
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|
1722 } |
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|
1723 |
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|
1724 bool fields_well_formed() { |
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|
1725 bool ret1 = (_real_start_word == NULL) && |
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|
1726 (_real_end_word == NULL) && |
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|
1727 (_start_word == NULL); |
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|
1728 if (ret1) |
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|
1729 return true; |
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|
1730 |
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|
1731 bool ret2 = _real_start_word >= _start_word && |
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|
1732 _start_word < _real_end_word && |
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|
1733 (_real_start_word + _gclab_word_size) == _real_end_word && |
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|
1734 (_start_word + _gclab_word_size + _bitmap_word_covers_words) |
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
ysr
parents:
838
diff
changeset
|
1735 > _real_end_word; |
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
ysr
parents:
838
diff
changeset
|
1736 return ret2; |
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
ysr
parents:
838
diff
changeset
|
1737 } |
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
ysr
parents:
838
diff
changeset
|
1738 |
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
ysr
parents:
838
diff
changeset
|
1739 inline bool mark(HeapWord* addr) { |
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
ysr
parents:
838
diff
changeset
|
1740 guarantee(use_local_bitmaps, "invariant"); |
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
ysr
parents:
838
diff
changeset
|
1741 assert(fields_well_formed(), "invariant"); |
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
ysr
parents:
838
diff
changeset
|
1742 |
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
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parents:
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diff
changeset
|
1743 if (addr >= _real_start_word && addr < _real_end_word) { |
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
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parents:
838
diff
changeset
|
1744 assert(!isMarked(addr), "should not have already been marked"); |
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
ysr
parents:
838
diff
changeset
|
1745 |
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
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parents:
838
diff
changeset
|
1746 // first mark it on the bitmap |
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
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parents:
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diff
changeset
|
1747 at_put(heapWordToOffset(addr), true); |
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
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parents:
838
diff
changeset
|
1748 |
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
ysr
parents:
838
diff
changeset
|
1749 return true; |
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
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parents:
838
diff
changeset
|
1750 } else { |
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
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parents:
838
diff
changeset
|
1751 return false; |
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
ysr
parents:
838
diff
changeset
|
1752 } |
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
ysr
parents:
838
diff
changeset
|
1753 } |
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
ysr
parents:
838
diff
changeset
|
1754 |
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
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parents:
838
diff
changeset
|
1755 inline bool isMarked(HeapWord* addr) { |
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
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parents:
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diff
changeset
|
1756 guarantee(use_local_bitmaps, "invariant"); |
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
ysr
parents:
838
diff
changeset
|
1757 assert(fields_well_formed(), "invariant"); |
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
ysr
parents:
838
diff
changeset
|
1758 |
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
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parents:
838
diff
changeset
|
1759 return at(heapWordToOffset(addr)); |
df6caf649ff7
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parents:
838
diff
changeset
|
1760 } |
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
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parents:
838
diff
changeset
|
1761 |
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
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parents:
838
diff
changeset
|
1762 void set_buffer(HeapWord* start) { |
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
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parents:
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diff
changeset
|
1763 guarantee(use_local_bitmaps, "invariant"); |
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
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parents:
838
diff
changeset
|
1764 clear(); |
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
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parents:
838
diff
changeset
|
1765 |
df6caf649ff7
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parents:
838
diff
changeset
|
1766 assert(start != NULL, "invariant"); |
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
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parents:
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diff
changeset
|
1767 _real_start_word = start; |
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
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parents:
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diff
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|
1768 _real_end_word = start + _gclab_word_size; |
df6caf649ff7
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parents:
838
diff
changeset
|
1769 |
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parents:
838
diff
changeset
|
1770 size_t diff = |
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6700789: G1: Enable use of compressed oops with G1 heaps
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parents:
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diff
changeset
|
1771 pointer_delta(start, _heap_start) % _bitmap_word_covers_words; |
df6caf649ff7
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parents:
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diff
changeset
|
1772 _start_word = start - diff; |
df6caf649ff7
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parents:
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diff
changeset
|
1773 |
df6caf649ff7
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parents:
838
diff
changeset
|
1774 assert(fields_well_formed(), "invariant"); |
df6caf649ff7
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parents:
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diff
changeset
|
1775 } |
df6caf649ff7
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parents:
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diff
changeset
|
1776 |
df6caf649ff7
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parents:
838
diff
changeset
|
1777 #ifndef PRODUCT |
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parents:
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diff
changeset
|
1778 void verify() { |
df6caf649ff7
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parents:
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diff
changeset
|
1779 // verify that the marks have been propagated |
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parents:
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diff
changeset
|
1780 GCLabBitMapClosure cl(_cm, this); |
df6caf649ff7
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parents:
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diff
changeset
|
1781 iterate(&cl); |
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
ysr
parents:
838
diff
changeset
|
1782 } |
df6caf649ff7
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parents:
838
diff
changeset
|
1783 #endif // PRODUCT |
df6caf649ff7
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parents:
838
diff
changeset
|
1784 |
df6caf649ff7
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ysr
parents:
838
diff
changeset
|
1785 void retire() { |
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
ysr
parents:
838
diff
changeset
|
1786 guarantee(use_local_bitmaps, "invariant"); |
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
ysr
parents:
838
diff
changeset
|
1787 assert(fields_well_formed(), "invariant"); |
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
ysr
parents:
838
diff
changeset
|
1788 |
df6caf649ff7
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ysr
parents:
838
diff
changeset
|
1789 if (_start_word != NULL) { |
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
ysr
parents:
838
diff
changeset
|
1790 CMBitMap* mark_bitmap = _cm->nextMarkBitMap(); |
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
ysr
parents:
838
diff
changeset
|
1791 |
df6caf649ff7
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parents:
838
diff
changeset
|
1792 // this means that the bitmap was set up for the GCLab |
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
ysr
parents:
838
diff
changeset
|
1793 assert(_real_start_word != NULL && _real_end_word != NULL, "invariant"); |
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
ysr
parents:
838
diff
changeset
|
1794 |
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
ysr
parents:
838
diff
changeset
|
1795 mark_bitmap->mostly_disjoint_range_union(this, |
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
ysr
parents:
838
diff
changeset
|
1796 0, // always start from the start of the bitmap |
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
ysr
parents:
838
diff
changeset
|
1797 _start_word, |
1391
79e419e5ea3b
6942253: G1: replace G1ParallelGCAllocBufferSize with YoungPLABSize and OldPLABSize
apetrusenko
parents:
1313
diff
changeset
|
1798 gclab_real_word_size()); |
845
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
ysr
parents:
838
diff
changeset
|
1799 _cm->grayRegionIfNecessary(MemRegion(_real_start_word, _real_end_word)); |
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
ysr
parents:
838
diff
changeset
|
1800 |
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
ysr
parents:
838
diff
changeset
|
1801 #ifndef PRODUCT |
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
ysr
parents:
838
diff
changeset
|
1802 if (use_local_bitmaps && verify_local_bitmaps) |
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
ysr
parents:
838
diff
changeset
|
1803 verify(); |
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
ysr
parents:
838
diff
changeset
|
1804 #endif // PRODUCT |
df6caf649ff7
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parents:
838
diff
changeset
|
1805 } else { |
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
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parents:
838
diff
changeset
|
1806 assert(_real_start_word == NULL && _real_end_word == NULL, "invariant"); |
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
ysr
parents:
838
diff
changeset
|
1807 } |
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
ysr
parents:
838
diff
changeset
|
1808 } |
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
ysr
parents:
838
diff
changeset
|
1809 |
1391
79e419e5ea3b
6942253: G1: replace G1ParallelGCAllocBufferSize with YoungPLABSize and OldPLABSize
apetrusenko
parents:
1313
diff
changeset
|
1810 size_t bitmap_size_in_words() const { |
79e419e5ea3b
6942253: G1: replace G1ParallelGCAllocBufferSize with YoungPLABSize and OldPLABSize
apetrusenko
parents:
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diff
changeset
|
1811 return (bitmap_size_in_bits(gclab_word_size()) + BitsPerWord - 1) / BitsPerWord; |
845
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
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parents:
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diff
changeset
|
1812 } |
1391
79e419e5ea3b
6942253: G1: replace G1ParallelGCAllocBufferSize with YoungPLABSize and OldPLABSize
apetrusenko
parents:
1313
diff
changeset
|
1813 |
845
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
ysr
parents:
838
diff
changeset
|
1814 }; |
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
ysr
parents:
838
diff
changeset
|
1815 |
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
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parents:
838
diff
changeset
|
1816 class G1ParGCAllocBuffer: public ParGCAllocBuffer { |
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
ysr
parents:
838
diff
changeset
|
1817 private: |
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
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parents:
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diff
changeset
|
1818 bool _retired; |
3886
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7080389: G1: refactor marking code in evacuation pause copy closures
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parents:
3867
diff
changeset
|
1819 bool _should_mark_objects; |
845
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
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parents:
838
diff
changeset
|
1820 GCLabBitMap _bitmap; |
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
ysr
parents:
838
diff
changeset
|
1821 |
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6700789: G1: Enable use of compressed oops with G1 heaps
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parents:
838
diff
changeset
|
1822 public: |
3886
eeae91c9baba
7080389: G1: refactor marking code in evacuation pause copy closures
johnc
parents:
3867
diff
changeset
|
1823 G1ParGCAllocBuffer(size_t gclab_word_size); |
845
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
ysr
parents:
838
diff
changeset
|
1824 |
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
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parents:
838
diff
changeset
|
1825 inline bool mark(HeapWord* addr) { |
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
ysr
parents:
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diff
changeset
|
1826 guarantee(use_local_bitmaps, "invariant"); |
3886
eeae91c9baba
7080389: G1: refactor marking code in evacuation pause copy closures
johnc
parents:
3867
diff
changeset
|
1827 assert(_should_mark_objects, "invariant"); |
845
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
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parents:
838
diff
changeset
|
1828 return _bitmap.mark(addr); |
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parents:
838
diff
changeset
|
1829 } |
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
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parents:
838
diff
changeset
|
1830 |
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
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parents:
838
diff
changeset
|
1831 inline void set_buf(HeapWord* buf) { |
3886
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7080389: G1: refactor marking code in evacuation pause copy closures
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parents:
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diff
changeset
|
1832 if (use_local_bitmaps && _should_mark_objects) { |
845
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
ysr
parents:
838
diff
changeset
|
1833 _bitmap.set_buffer(buf); |
3886
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7080389: G1: refactor marking code in evacuation pause copy closures
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parents:
3867
diff
changeset
|
1834 } |
845
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
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parents:
838
diff
changeset
|
1835 ParGCAllocBuffer::set_buf(buf); |
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
ysr
parents:
838
diff
changeset
|
1836 _retired = false; |
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
ysr
parents:
838
diff
changeset
|
1837 } |
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
ysr
parents:
838
diff
changeset
|
1838 |
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
ysr
parents:
838
diff
changeset
|
1839 inline void retire(bool end_of_gc, bool retain) { |
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
ysr
parents:
838
diff
changeset
|
1840 if (_retired) |
df6caf649ff7
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parents:
838
diff
changeset
|
1841 return; |
3886
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7080389: G1: refactor marking code in evacuation pause copy closures
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parents:
3867
diff
changeset
|
1842 if (use_local_bitmaps && _should_mark_objects) { |
845
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
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parents:
838
diff
changeset
|
1843 _bitmap.retire(); |
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
ysr
parents:
838
diff
changeset
|
1844 } |
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
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parents:
838
diff
changeset
|
1845 ParGCAllocBuffer::retire(end_of_gc, retain); |
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
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parents:
838
diff
changeset
|
1846 _retired = true; |
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
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parents:
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diff
changeset
|
1847 } |
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
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parents:
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diff
changeset
|
1848 }; |
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
ysr
parents:
838
diff
changeset
|
1849 |
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
ysr
parents:
838
diff
changeset
|
1850 class G1ParScanThreadState : public StackObj { |
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
ysr
parents:
838
diff
changeset
|
1851 protected: |
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
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parents:
838
diff
changeset
|
1852 G1CollectedHeap* _g1h; |
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
ysr
parents:
838
diff
changeset
|
1853 RefToScanQueue* _refs; |
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
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parents:
838
diff
changeset
|
1854 DirtyCardQueue _dcq; |
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
ysr
parents:
838
diff
changeset
|
1855 CardTableModRefBS* _ct_bs; |
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
ysr
parents:
838
diff
changeset
|
1856 G1RemSet* _g1_rem; |
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
ysr
parents:
838
diff
changeset
|
1857 |
1391
79e419e5ea3b
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apetrusenko
parents:
1313
diff
changeset
|
1858 G1ParGCAllocBuffer _surviving_alloc_buffer; |
79e419e5ea3b
6942253: G1: replace G1ParallelGCAllocBufferSize with YoungPLABSize and OldPLABSize
apetrusenko
parents:
1313
diff
changeset
|
1859 G1ParGCAllocBuffer _tenured_alloc_buffer; |
79e419e5ea3b
6942253: G1: replace G1ParallelGCAllocBufferSize with YoungPLABSize and OldPLABSize
apetrusenko
parents:
1313
diff
changeset
|
1860 G1ParGCAllocBuffer* _alloc_buffers[GCAllocPurposeCount]; |
79e419e5ea3b
6942253: G1: replace G1ParallelGCAllocBufferSize with YoungPLABSize and OldPLABSize
apetrusenko
parents:
1313
diff
changeset
|
1861 ageTable _age_table; |
845
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6700789: G1: Enable use of compressed oops with G1 heaps
ysr
parents:
838
diff
changeset
|
1862 |
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1863 size_t _alloc_buffer_waste; |
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1864 size_t _undo_waste; |
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1865 |
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1866 OopsInHeapRegionClosure* _evac_failure_cl; |
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1867 G1ParScanHeapEvacClosure* _evac_cl; |
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1868 G1ParScanPartialArrayClosure* _partial_scan_cl; |
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1869 |
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1870 int _hash_seed; |
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1871 int _queue_num; |
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1872 |
1611 | 1873 size_t _term_attempts; |
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1874 |
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1875 double _start; |
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1876 double _start_strong_roots; |
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1877 double _strong_roots_time; |
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1878 double _start_term; |
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1879 double _term_time; |
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1880 |
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1881 // Map from young-age-index (0 == not young, 1 is youngest) to |
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1882 // surviving words. base is what we get back from the malloc call |
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1883 size_t* _surviving_young_words_base; |
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1884 // this points into the array, as we use the first few entries for padding |
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1885 size_t* _surviving_young_words; |
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1886 |
1709 | 1887 #define PADDING_ELEM_NUM (DEFAULT_CACHE_LINE_SIZE / sizeof(size_t)) |
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1888 |
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1889 void add_to_alloc_buffer_waste(size_t waste) { _alloc_buffer_waste += waste; } |
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1890 |
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1891 void add_to_undo_waste(size_t waste) { _undo_waste += waste; } |
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1892 |
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1893 DirtyCardQueue& dirty_card_queue() { return _dcq; } |
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1894 CardTableModRefBS* ctbs() { return _ct_bs; } |
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1895 |
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1896 template <class T> void immediate_rs_update(HeapRegion* from, T* p, int tid) { |
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1897 if (!from->is_survivor()) { |
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1898 _g1_rem->par_write_ref(from, p, tid); |
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1899 } |
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1900 } |
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1901 |
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1902 template <class T> void deferred_rs_update(HeapRegion* from, T* p, int tid) { |
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1903 // If the new value of the field points to the same region or |
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1904 // is the to-space, we don't need to include it in the Rset updates. |
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1905 if (!from->is_in_reserved(oopDesc::load_decode_heap_oop(p)) && !from->is_survivor()) { |
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1906 size_t card_index = ctbs()->index_for(p); |
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1907 // If the card hasn't been added to the buffer, do it. |
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1908 if (ctbs()->mark_card_deferred(card_index)) { |
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1909 dirty_card_queue().enqueue((jbyte*)ctbs()->byte_for_index(card_index)); |
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1910 } |
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1911 } |
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1912 } |
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1913 |
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1914 public: |
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1915 G1ParScanThreadState(G1CollectedHeap* g1h, int queue_num); |
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1916 |
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1917 ~G1ParScanThreadState() { |
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1918 FREE_C_HEAP_ARRAY(size_t, _surviving_young_words_base); |
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1919 } |
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1920 |
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1921 RefToScanQueue* refs() { return _refs; } |
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1922 ageTable* age_table() { return &_age_table; } |
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1923 |
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1924 G1ParGCAllocBuffer* alloc_buffer(GCAllocPurpose purpose) { |
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1925 return _alloc_buffers[purpose]; |
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1926 } |
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1927 |
1709 | 1928 size_t alloc_buffer_waste() const { return _alloc_buffer_waste; } |
1929 size_t undo_waste() const { return _undo_waste; } | |
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1930 |
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1931 #ifdef ASSERT |
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1932 bool verify_ref(narrowOop* ref) const; |
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1933 bool verify_ref(oop* ref) const; |
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1934 bool verify_task(StarTask ref) const; |
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1935 #endif // ASSERT |
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1936 |
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1937 template <class T> void push_on_queue(T* ref) { |
1862
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1938 assert(verify_ref(ref), "sanity"); |
1709 | 1939 refs()->push(ref); |
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1940 } |
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1941 |
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1942 template <class T> void update_rs(HeapRegion* from, T* p, int tid) { |
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1943 if (G1DeferredRSUpdate) { |
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1944 deferred_rs_update(from, p, tid); |
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1945 } else { |
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1946 immediate_rs_update(from, p, tid); |
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1947 } |
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1948 } |
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1949 |
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1950 HeapWord* allocate_slow(GCAllocPurpose purpose, size_t word_sz) { |
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1951 |
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1952 HeapWord* obj = NULL; |
1391
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1953 size_t gclab_word_size = _g1h->desired_plab_sz(purpose); |
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1954 if (word_sz * 100 < gclab_word_size * ParallelGCBufferWastePct) { |
845
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1955 G1ParGCAllocBuffer* alloc_buf = alloc_buffer(purpose); |
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1956 assert(gclab_word_size == alloc_buf->word_sz(), |
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1957 "dynamic resizing is not supported"); |
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1958 add_to_alloc_buffer_waste(alloc_buf->words_remaining()); |
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1959 alloc_buf->retire(false, false); |
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1960 |
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1961 HeapWord* buf = _g1h->par_allocate_during_gc(purpose, gclab_word_size); |
845
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1962 if (buf == NULL) return NULL; // Let caller handle allocation failure. |
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1963 // Otherwise. |
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1964 alloc_buf->set_buf(buf); |
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1965 |
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1966 obj = alloc_buf->allocate(word_sz); |
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1967 assert(obj != NULL, "buffer was definitely big enough..."); |
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1968 } else { |
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1969 obj = _g1h->par_allocate_during_gc(purpose, word_sz); |
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1970 } |
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1971 return obj; |
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1972 } |
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1973 |
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1974 HeapWord* allocate(GCAllocPurpose purpose, size_t word_sz) { |
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1975 HeapWord* obj = alloc_buffer(purpose)->allocate(word_sz); |
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1976 if (obj != NULL) return obj; |
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1977 return allocate_slow(purpose, word_sz); |
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1978 } |
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1979 |
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1980 void undo_allocation(GCAllocPurpose purpose, HeapWord* obj, size_t word_sz) { |
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1981 if (alloc_buffer(purpose)->contains(obj)) { |
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1982 assert(alloc_buffer(purpose)->contains(obj + word_sz - 1), |
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1983 "should contain whole object"); |
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1984 alloc_buffer(purpose)->undo_allocation(obj, word_sz); |
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1985 } else { |
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1986 CollectedHeap::fill_with_object(obj, word_sz); |
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1987 add_to_undo_waste(word_sz); |
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1988 } |
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1989 } |
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1990 |
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1991 void set_evac_failure_closure(OopsInHeapRegionClosure* evac_failure_cl) { |
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1992 _evac_failure_cl = evac_failure_cl; |
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1993 } |
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1994 OopsInHeapRegionClosure* evac_failure_closure() { |
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1995 return _evac_failure_cl; |
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1996 } |
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1997 |
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1998 void set_evac_closure(G1ParScanHeapEvacClosure* evac_cl) { |
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1999 _evac_cl = evac_cl; |
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2000 } |
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2001 |
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2002 void set_partial_scan_closure(G1ParScanPartialArrayClosure* partial_scan_cl) { |
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2003 _partial_scan_cl = partial_scan_cl; |
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2004 } |
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2005 |
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2006 int* hash_seed() { return &_hash_seed; } |
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2007 int queue_num() { return _queue_num; } |
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2008 |
1709 | 2009 size_t term_attempts() const { return _term_attempts; } |
1611 | 2010 void note_term_attempt() { _term_attempts++; } |
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2011 |
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2012 void start_strong_roots() { |
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2013 _start_strong_roots = os::elapsedTime(); |
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2014 } |
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2015 void end_strong_roots() { |
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2016 _strong_roots_time += (os::elapsedTime() - _start_strong_roots); |
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2017 } |
1709 | 2018 double strong_roots_time() const { return _strong_roots_time; } |
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2019 |
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2020 void start_term_time() { |
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2021 note_term_attempt(); |
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2022 _start_term = os::elapsedTime(); |
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2023 } |
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2024 void end_term_time() { |
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2025 _term_time += (os::elapsedTime() - _start_term); |
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2026 } |
1709 | 2027 double term_time() const { return _term_time; } |
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2028 |
1709 | 2029 double elapsed_time() const { |
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2030 return os::elapsedTime() - _start; |
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2031 } |
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2032 |
1709 | 2033 static void |
2034 print_termination_stats_hdr(outputStream* const st = gclog_or_tty); | |
2035 void | |
2036 print_termination_stats(int i, outputStream* const st = gclog_or_tty) const; | |
2037 | |
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2038 size_t* surviving_young_words() { |
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2039 // We add on to hide entry 0 which accumulates surviving words for |
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2040 // age -1 regions (i.e. non-young ones) |
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2041 return _surviving_young_words; |
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2042 } |
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2043 |
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2044 void retire_alloc_buffers() { |
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2045 for (int ap = 0; ap < GCAllocPurposeCount; ++ap) { |
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2046 size_t waste = _alloc_buffers[ap]->words_remaining(); |
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2047 add_to_alloc_buffer_waste(waste); |
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2048 _alloc_buffers[ap]->retire(true, false); |
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2049 } |
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2050 } |
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2051 |
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2052 template <class T> void deal_with_reference(T* ref_to_scan) { |
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2053 if (has_partial_array_mask(ref_to_scan)) { |
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2054 _partial_scan_cl->do_oop_nv(ref_to_scan); |
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2055 } else { |
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2056 // Note: we can use "raw" versions of "region_containing" because |
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2057 // "obj_to_scan" is definitely in the heap, and is not in a |
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2058 // humongous region. |
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2059 HeapRegion* r = _g1h->heap_region_containing_raw(ref_to_scan); |
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2060 _evac_cl->set_region(r); |
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2061 _evac_cl->do_oop_nv(ref_to_scan); |
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2062 } |
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2063 } |
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2064 |
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2065 void deal_with_reference(StarTask ref) { |
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2066 assert(verify_task(ref), "sanity"); |
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2067 if (ref.is_narrow()) { |
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2068 deal_with_reference((narrowOop*)ref); |
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2069 } else { |
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2070 deal_with_reference((oop*)ref); |
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2071 } |
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2072 } |
1862
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2073 |
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2074 public: |
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2075 void trim_queue(); |
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2076 }; |
1972 | 2077 |
2078 #endif // SHARE_VM_GC_IMPLEMENTATION_G1_G1COLLECTEDHEAP_HPP |