Mercurial > hg > truffle
annotate src/share/vm/gc_implementation/g1/g1CollectedHeap.hpp @ 4784:02838862dec8
7121623: G1: always be able to reliably calculate the length of a forwarded chunked array
Summary: Store the "next chunk start index" in the length field of the to-space object, instead of the from-space object, so that we can always reliably read the size of all from-space objects.
Reviewed-by: johnc, ysr, jmasa
author | tonyp |
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date | Sat, 07 Jan 2012 00:43:59 -0500 |
parents | 023652e49ac0 |
children | 2ace1c4ee8da |
rev | line source |
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342 | 1 /* |
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2 * Copyright (c) 2001, 2012, Oracle and/or its affiliates. All rights reserved. |
342 | 3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
4 * | |
5 * This code is free software; you can redistribute it and/or modify it | |
6 * under the terms of the GNU General Public License version 2 only, as | |
7 * published by the Free Software Foundation. | |
8 * | |
9 * This code is distributed in the hope that it will be useful, but WITHOUT | |
10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or | |
11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License | |
12 * version 2 for more details (a copy is included in the LICENSE file that | |
13 * accompanied this code). | |
14 * | |
15 * You should have received a copy of the GNU General Public License version | |
16 * 2 along with this work; if not, write to the Free Software Foundation, | |
17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. | |
18 * | |
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19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
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20 * or visit www.oracle.com if you need additional information or have any |
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21 * questions. |
342 | 22 * |
23 */ | |
24 | |
1972 | 25 #ifndef SHARE_VM_GC_IMPLEMENTATION_G1_G1COLLECTEDHEAP_HPP |
26 #define SHARE_VM_GC_IMPLEMENTATION_G1_G1COLLECTEDHEAP_HPP | |
27 | |
28 #include "gc_implementation/g1/concurrentMark.hpp" | |
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29 #include "gc_implementation/g1/g1AllocRegion.hpp" |
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30 #include "gc_implementation/g1/g1HRPrinter.hpp" |
1972 | 31 #include "gc_implementation/g1/g1RemSet.hpp" |
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32 #include "gc_implementation/g1/g1MonitoringSupport.hpp" |
3766 | 33 #include "gc_implementation/g1/heapRegionSeq.hpp" |
2152 | 34 #include "gc_implementation/g1/heapRegionSets.hpp" |
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35 #include "gc_implementation/shared/hSpaceCounters.hpp" |
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 | |
4072 | 242 // It keeps track of the old regions. |
243 MasterOldRegionSet _old_set; | |
244 | |
2152 | 245 // It keeps track of the humongous regions. |
246 MasterHumongousRegionSet _humongous_set; | |
342 | 247 |
248 // The number of regions we could create by expansion. | |
249 size_t _expansion_regions; | |
250 | |
251 // The block offset table for the G1 heap. | |
252 G1BlockOffsetSharedArray* _bot_shared; | |
253 | |
4072 | 254 // Tears down the region sets / lists so that they are empty and the |
255 // regions on the heap do not belong to a region set / list. The | |
256 // only exception is the humongous set which we leave unaltered. If | |
257 // free_list_only is true, it will only tear down the master free | |
258 // list. It is called before a Full GC (free_list_only == false) or | |
259 // before heap shrinking (free_list_only == true). | |
260 void tear_down_region_sets(bool free_list_only); | |
261 | |
262 // Rebuilds the region sets / lists so that they are repopulated to | |
263 // reflect the contents of the heap. The only exception is the | |
264 // humongous set which was not torn down in the first place. If | |
265 // free_list_only is true, it will only rebuild the master free | |
266 // list. It is called after a Full GC (free_list_only == false) or | |
267 // after heap shrinking (free_list_only == true). | |
268 void rebuild_region_sets(bool free_list_only); | |
342 | 269 |
270 // The sequence of all heap regions in the heap. | |
3766 | 271 HeapRegionSeq _hrs; |
342 | 272 |
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273 // Alloc region used to satisfy mutator allocation requests. |
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274 MutatorAllocRegion _mutator_alloc_region; |
342 | 275 |
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276 // Alloc region used to satisfy allocation requests by the GC for |
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277 // survivor objects. |
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278 SurvivorGCAllocRegion _survivor_gc_alloc_region; |
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279 |
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280 // Alloc region used to satisfy allocation requests by the GC for |
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281 // old objects. |
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282 OldGCAllocRegion _old_gc_alloc_region; |
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283 |
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284 // The last old region we allocated to during the last GC. |
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285 // Typically, it is not full so we should re-use it during the next GC. |
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286 HeapRegion* _retained_old_gc_alloc_region; |
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287 |
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288 // It specifies whether we should attempt to expand the heap after a |
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289 // region allocation failure. If heap expansion fails we set this to |
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290 // false so that we don't re-attempt the heap expansion (it's likely |
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291 // that subsequent expansion attempts will also fail if one fails). |
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292 // Currently, it is only consulted during GC and it's reset at the |
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293 // start of each GC. |
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294 bool _expand_heap_after_alloc_failure; |
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295 |
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296 // It resets the mutator alloc region before new allocations can take place. |
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297 void init_mutator_alloc_region(); |
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298 |
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299 // It releases the mutator alloc region. |
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300 void release_mutator_alloc_region(); |
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301 |
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302 // It initializes the GC alloc regions at the start of a GC. |
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303 void init_gc_alloc_regions(); |
342 | 304 |
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305 // It releases the GC alloc regions at the end of a GC. |
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306 void release_gc_alloc_regions(); |
342 | 307 |
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308 // It does any cleanup that needs to be done on the GC alloc regions |
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309 // before a Full GC. |
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310 void abandon_gc_alloc_regions(); |
342 | 311 |
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312 // Helper for monitoring and management support. |
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313 G1MonitoringSupport* _g1mm; |
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314 |
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315 // Determines PLAB size for a particular allocation purpose. |
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316 static size_t desired_plab_sz(GCAllocPurpose purpose); |
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317 |
342 | 318 // Outside of GC pauses, the number of bytes used in all regions other |
319 // than the current allocation region. | |
320 size_t _summary_bytes_used; | |
321 | |
526 | 322 // This is used for a quick test on whether a reference points into |
323 // the collection set or not. Basically, we have an array, with one | |
324 // byte per region, and that byte denotes whether the corresponding | |
325 // region is in the collection set or not. The entry corresponding | |
326 // the bottom of the heap, i.e., region 0, is pointed to by | |
327 // _in_cset_fast_test_base. The _in_cset_fast_test field has been | |
328 // biased so that it actually points to address 0 of the address | |
329 // space, to make the test as fast as possible (we can simply shift | |
330 // the address to address into it, instead of having to subtract the | |
331 // bottom of the heap from the address before shifting it; basically | |
332 // it works in the same way the card table works). | |
333 bool* _in_cset_fast_test; | |
334 | |
335 // The allocated array used for the fast test on whether a reference | |
336 // points into the collection set or not. This field is also used to | |
337 // free the array. | |
338 bool* _in_cset_fast_test_base; | |
339 | |
340 // The length of the _in_cset_fast_test_base array. | |
341 size_t _in_cset_fast_test_length; | |
342 | |
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343 volatile unsigned _gc_time_stamp; |
342 | 344 |
345 size_t* _surviving_young_words; | |
346 | |
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347 G1HRPrinter _hr_printer; |
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348 |
342 | 349 void setup_surviving_young_words(); |
350 void update_surviving_young_words(size_t* surv_young_words); | |
351 void cleanup_surviving_young_words(); | |
352 | |
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353 // It decides whether an explicit GC should start a concurrent cycle |
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354 // instead of doing a STW GC. Currently, a concurrent cycle is |
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355 // explicitly started if: |
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356 // (a) cause == _gc_locker and +GCLockerInvokesConcurrent, or |
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357 // (b) cause == _java_lang_system_gc and +ExplicitGCInvokesConcurrent. |
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358 bool should_do_concurrent_full_gc(GCCause::Cause cause); |
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359 |
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360 // Keeps track of how many "full collections" (i.e., Full GCs or |
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361 // concurrent cycles) we have completed. The number of them we have |
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362 // started is maintained in _total_full_collections in CollectedHeap. |
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363 volatile unsigned int _full_collections_completed; |
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364 |
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365 // This is a non-product method that is helpful for testing. It is |
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366 // called at the end of a GC and artificially expands the heap by |
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367 // allocating a number of dead regions. This way we can induce very |
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368 // frequent marking cycles and stress the cleanup / concurrent |
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369 // cleanup code more (as all the regions that will be allocated by |
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370 // this method will be found dead by the marking cycle). |
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371 void allocate_dummy_regions() PRODUCT_RETURN; |
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372 |
1973 | 373 // These are macros so that, if the assert fires, we get the correct |
374 // line number, file, etc. | |
375 | |
2361 | 376 #define heap_locking_asserts_err_msg(_extra_message_) \ |
2152 | 377 err_msg("%s : Heap_lock locked: %s, at safepoint: %s, is VM thread: %s", \ |
2361 | 378 (_extra_message_), \ |
2152 | 379 BOOL_TO_STR(Heap_lock->owned_by_self()), \ |
380 BOOL_TO_STR(SafepointSynchronize::is_at_safepoint()), \ | |
381 BOOL_TO_STR(Thread::current()->is_VM_thread())) | |
1973 | 382 |
383 #define assert_heap_locked() \ | |
384 do { \ | |
385 assert(Heap_lock->owned_by_self(), \ | |
386 heap_locking_asserts_err_msg("should be holding the Heap_lock")); \ | |
387 } while (0) | |
388 | |
2361 | 389 #define assert_heap_locked_or_at_safepoint(_should_be_vm_thread_) \ |
1973 | 390 do { \ |
391 assert(Heap_lock->owned_by_self() || \ | |
2152 | 392 (SafepointSynchronize::is_at_safepoint() && \ |
2361 | 393 ((_should_be_vm_thread_) == Thread::current()->is_VM_thread())), \ |
1973 | 394 heap_locking_asserts_err_msg("should be holding the Heap_lock or " \ |
395 "should be at a safepoint")); \ | |
396 } while (0) | |
397 | |
398 #define assert_heap_locked_and_not_at_safepoint() \ | |
399 do { \ | |
400 assert(Heap_lock->owned_by_self() && \ | |
401 !SafepointSynchronize::is_at_safepoint(), \ | |
402 heap_locking_asserts_err_msg("should be holding the Heap_lock and " \ | |
403 "should not be at a safepoint")); \ | |
404 } while (0) | |
405 | |
406 #define assert_heap_not_locked() \ | |
407 do { \ | |
408 assert(!Heap_lock->owned_by_self(), \ | |
409 heap_locking_asserts_err_msg("should not be holding the Heap_lock")); \ | |
410 } while (0) | |
411 | |
412 #define assert_heap_not_locked_and_not_at_safepoint() \ | |
413 do { \ | |
414 assert(!Heap_lock->owned_by_self() && \ | |
415 !SafepointSynchronize::is_at_safepoint(), \ | |
416 heap_locking_asserts_err_msg("should not be holding the Heap_lock and " \ | |
417 "should not be at a safepoint")); \ | |
418 } while (0) | |
419 | |
2361 | 420 #define assert_at_safepoint(_should_be_vm_thread_) \ |
1973 | 421 do { \ |
2152 | 422 assert(SafepointSynchronize::is_at_safepoint() && \ |
2361 | 423 ((_should_be_vm_thread_) == Thread::current()->is_VM_thread()), \ |
1973 | 424 heap_locking_asserts_err_msg("should be at a safepoint")); \ |
425 } while (0) | |
426 | |
427 #define assert_not_at_safepoint() \ | |
428 do { \ | |
429 assert(!SafepointSynchronize::is_at_safepoint(), \ | |
430 heap_locking_asserts_err_msg("should not be at a safepoint")); \ | |
431 } while (0) | |
432 | |
342 | 433 protected: |
434 | |
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435 // The young region list. |
342 | 436 YoungList* _young_list; |
437 | |
438 // The current policy object for the collector. | |
439 G1CollectorPolicy* _g1_policy; | |
440 | |
2152 | 441 // This is the second level of trying to allocate a new region. If |
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442 // new_region() didn't find a region on the free_list, this call will |
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443 // check whether there's anything available on the |
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444 // secondary_free_list and/or wait for more regions to appear on |
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445 // that list, if _free_regions_coming is set. |
2361 | 446 HeapRegion* new_region_try_secondary_free_list(); |
342 | 447 |
2361 | 448 // Try to allocate a single non-humongous HeapRegion sufficient for |
449 // an allocation of the given word_size. If do_expand is true, | |
450 // attempt to expand the heap if necessary to satisfy the allocation | |
451 // request. | |
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452 HeapRegion* new_region(size_t word_size, bool do_expand); |
342 | 453 |
2361 | 454 // Attempt to satisfy a humongous allocation request of the given |
455 // size by finding a contiguous set of free regions of num_regions | |
456 // length and remove them from the master free list. Return the | |
3766 | 457 // index of the first region or G1_NULL_HRS_INDEX if the search |
458 // was unsuccessful. | |
459 size_t humongous_obj_allocate_find_first(size_t num_regions, | |
460 size_t word_size); | |
342 | 461 |
2361 | 462 // Initialize a contiguous set of free regions of length num_regions |
463 // and starting at index first so that they appear as a single | |
464 // humongous region. | |
3766 | 465 HeapWord* humongous_obj_allocate_initialize_regions(size_t first, |
2361 | 466 size_t num_regions, |
467 size_t word_size); | |
468 | |
469 // Attempt to allocate a humongous object of the given size. Return | |
470 // NULL if unsuccessful. | |
2152 | 471 HeapWord* humongous_obj_allocate(size_t word_size); |
1973 | 472 |
473 // The following two methods, allocate_new_tlab() and | |
474 // mem_allocate(), are the two main entry points from the runtime | |
475 // into the G1's allocation routines. They have the following | |
476 // assumptions: | |
477 // | |
478 // * They should both be called outside safepoints. | |
479 // | |
480 // * They should both be called without holding the Heap_lock. | |
481 // | |
482 // * All allocation requests for new TLABs should go to | |
483 // allocate_new_tlab(). | |
484 // | |
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485 // * All non-TLAB allocation requests should go to mem_allocate(). |
1973 | 486 // |
487 // * If either call cannot satisfy the allocation request using the | |
488 // current allocating region, they will try to get a new one. If | |
489 // this fails, they will attempt to do an evacuation pause and | |
490 // retry the allocation. | |
491 // | |
492 // * If all allocation attempts fail, even after trying to schedule | |
493 // an evacuation pause, allocate_new_tlab() will return NULL, | |
494 // whereas mem_allocate() will attempt a heap expansion and/or | |
495 // schedule a Full GC. | |
496 // | |
497 // * We do not allow humongous-sized TLABs. So, allocate_new_tlab | |
498 // should never be called with word_size being humongous. All | |
499 // humongous allocation requests should go to mem_allocate() which | |
500 // will satisfy them with a special path. | |
501 | |
502 virtual HeapWord* allocate_new_tlab(size_t word_size); | |
503 | |
504 virtual HeapWord* mem_allocate(size_t word_size, | |
505 bool* gc_overhead_limit_was_exceeded); | |
342 | 506 |
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507 // The following three methods take a gc_count_before_ret |
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508 // parameter which is used to return the GC count if the method |
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509 // returns NULL. Given that we are required to read the GC count |
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510 // while holding the Heap_lock, and these paths will take the |
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511 // Heap_lock at some point, it's easier to get them to read the GC |
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512 // count while holding the Heap_lock before they return NULL instead |
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513 // of the caller (namely: mem_allocate()) having to also take the |
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514 // Heap_lock just to read the GC count. |
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515 |
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516 // First-level mutator allocation attempt: try to allocate out of |
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517 // the mutator alloc region without taking the Heap_lock. This |
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518 // should only be used for non-humongous allocations. |
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519 inline HeapWord* attempt_allocation(size_t word_size, |
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520 unsigned int* gc_count_before_ret); |
342 | 521 |
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522 // Second-level mutator allocation attempt: take the Heap_lock and |
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523 // retry the allocation attempt, potentially scheduling a GC |
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524 // pause. This should only be used for non-humongous allocations. |
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525 HeapWord* attempt_allocation_slow(size_t word_size, |
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526 unsigned int* gc_count_before_ret); |
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527 |
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528 // Takes the Heap_lock and attempts a humongous allocation. It can |
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529 // potentially schedule a GC pause. |
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530 HeapWord* attempt_allocation_humongous(size_t word_size, |
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531 unsigned int* gc_count_before_ret); |
1973 | 532 |
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533 // Allocation attempt that should be called during safepoints (e.g., |
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534 // at the end of a successful GC). expect_null_mutator_alloc_region |
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535 // specifies whether the mutator alloc region is expected to be NULL |
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536 // or not. |
1973 | 537 HeapWord* attempt_allocation_at_safepoint(size_t word_size, |
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538 bool expect_null_mutator_alloc_region); |
1973 | 539 |
540 // It dirties the cards that cover the block so that so that the post | |
541 // write barrier never queues anything when updating objects on this | |
542 // block. It is assumed (and in fact we assert) that the block | |
543 // belongs to a young region. | |
544 inline void dirty_young_block(HeapWord* start, size_t word_size); | |
342 | 545 |
546 // Allocate blocks during garbage collection. Will ensure an | |
547 // allocation region, either by picking one or expanding the | |
548 // heap, and then allocate a block of the given size. The block | |
549 // may not be a humongous - it must fit into a single heap region. | |
550 HeapWord* par_allocate_during_gc(GCAllocPurpose purpose, size_t word_size); | |
551 | |
552 HeapWord* allocate_during_gc_slow(GCAllocPurpose purpose, | |
553 HeapRegion* alloc_region, | |
554 bool par, | |
555 size_t word_size); | |
556 | |
557 // Ensure that no further allocations can happen in "r", bearing in mind | |
558 // that parallel threads might be attempting allocations. | |
559 void par_allocate_remaining_space(HeapRegion* r); | |
560 | |
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561 // Allocation attempt during GC for a survivor object / PLAB. |
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562 inline HeapWord* survivor_attempt_allocation(size_t word_size); |
545 | 563 |
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564 // Allocation attempt during GC for an old object / PLAB. |
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565 inline HeapWord* old_attempt_allocation(size_t word_size); |
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566 |
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567 // These methods are the "callbacks" from the G1AllocRegion class. |
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568 |
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569 // For mutator alloc regions. |
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570 HeapRegion* new_mutator_alloc_region(size_t word_size, bool force); |
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571 void retire_mutator_alloc_region(HeapRegion* alloc_region, |
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572 size_t allocated_bytes); |
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573 |
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574 // For GC alloc regions. |
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575 HeapRegion* new_gc_alloc_region(size_t word_size, size_t count, |
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576 GCAllocPurpose ap); |
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577 void retire_gc_alloc_region(HeapRegion* alloc_region, |
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578 size_t allocated_bytes, GCAllocPurpose ap); |
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579 |
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580 // - if explicit_gc is true, the GC is for a System.gc() or a heap |
1973 | 581 // inspection request and should collect the entire heap |
582 // - if clear_all_soft_refs is true, all soft references should be | |
583 // cleared during the GC | |
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584 // - if explicit_gc is false, word_size describes the allocation that |
1973 | 585 // the GC should attempt (at least) to satisfy |
586 // - it returns false if it is unable to do the collection due to the | |
587 // GC locker being active, true otherwise | |
588 bool do_collection(bool explicit_gc, | |
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589 bool clear_all_soft_refs, |
342 | 590 size_t word_size); |
591 | |
592 // Callback from VM_G1CollectFull operation. | |
593 // Perform a full collection. | |
594 void do_full_collection(bool clear_all_soft_refs); | |
595 | |
596 // Resize the heap if necessary after a full collection. If this is | |
597 // after a collect-for allocation, "word_size" is the allocation size, | |
598 // and will be considered part of the used portion of the heap. | |
599 void resize_if_necessary_after_full_collection(size_t word_size); | |
600 | |
601 // Callback from VM_G1CollectForAllocation operation. | |
602 // This function does everything necessary/possible to satisfy a | |
603 // failed allocation request (including collection, expansion, etc.) | |
1973 | 604 HeapWord* satisfy_failed_allocation(size_t word_size, bool* succeeded); |
342 | 605 |
606 // Attempting to expand the heap sufficiently | |
607 // to support an allocation of the given "word_size". If | |
608 // successful, perform the allocation and return the address of the | |
609 // allocated block, or else "NULL". | |
1973 | 610 HeapWord* expand_and_allocate(size_t word_size); |
342 | 611 |
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612 // Process any reference objects discovered during |
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613 // an incremental evacuation pause. |
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614 void process_discovered_references(); |
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615 |
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616 // Enqueue any remaining discovered references |
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617 // after processing. |
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618 void enqueue_discovered_references(); |
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619 |
342 | 620 public: |
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621 |
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622 G1MonitoringSupport* g1mm() { |
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623 assert(_g1mm != NULL, "should have been initialized"); |
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624 return _g1mm; |
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625 } |
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626 |
342 | 627 // Expand the garbage-first heap by at least the given size (in bytes!). |
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628 // Returns true if the heap was expanded by the requested amount; |
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629 // false otherwise. |
342 | 630 // (Rounds up to a HeapRegion boundary.) |
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631 bool expand(size_t expand_bytes); |
342 | 632 |
633 // Do anything common to GC's. | |
634 virtual void gc_prologue(bool full); | |
635 virtual void gc_epilogue(bool full); | |
636 | |
526 | 637 // We register a region with the fast "in collection set" test. We |
638 // simply set to true the array slot corresponding to this region. | |
639 void register_region_with_in_cset_fast_test(HeapRegion* r) { | |
640 assert(_in_cset_fast_test_base != NULL, "sanity"); | |
641 assert(r->in_collection_set(), "invariant"); | |
3766 | 642 size_t index = r->hrs_index(); |
643 assert(index < _in_cset_fast_test_length, "invariant"); | |
526 | 644 assert(!_in_cset_fast_test_base[index], "invariant"); |
645 _in_cset_fast_test_base[index] = true; | |
646 } | |
647 | |
648 // This is a fast test on whether a reference points into the | |
649 // collection set or not. It does not assume that the reference | |
650 // points into the heap; if it doesn't, it will return false. | |
651 bool in_cset_fast_test(oop obj) { | |
652 assert(_in_cset_fast_test != NULL, "sanity"); | |
653 if (_g1_committed.contains((HeapWord*) obj)) { | |
654 // no need to subtract the bottom of the heap from obj, | |
655 // _in_cset_fast_test is biased | |
656 size_t index = ((size_t) obj) >> HeapRegion::LogOfHRGrainBytes; | |
657 bool ret = _in_cset_fast_test[index]; | |
658 // let's make sure the result is consistent with what the slower | |
659 // test returns | |
660 assert( ret || !obj_in_cs(obj), "sanity"); | |
661 assert(!ret || obj_in_cs(obj), "sanity"); | |
662 return ret; | |
663 } else { | |
664 return false; | |
665 } | |
666 } | |
667 | |
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668 void clear_cset_fast_test() { |
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669 assert(_in_cset_fast_test_base != NULL, "sanity"); |
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670 memset(_in_cset_fast_test_base, false, |
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671 _in_cset_fast_test_length * sizeof(bool)); |
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672 } |
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673 |
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674 // This is called at the end of either a concurrent cycle or a Full |
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675 // GC to update the number of full collections completed. Those two |
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676 // can happen in a nested fashion, i.e., we start a concurrent |
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677 // cycle, a Full GC happens half-way through it which ends first, |
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678 // and then the cycle notices that a Full GC happened and ends |
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679 // too. The concurrent parameter is a boolean to help us do a bit |
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680 // tighter consistency checking in the method. If concurrent is |
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681 // false, the caller is the inner caller in the nesting (i.e., the |
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682 // Full GC). If concurrent is true, the caller is the outer caller |
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683 // in this nesting (i.e., the concurrent cycle). Further nesting is |
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684 // not currently supported. The end of the this call also notifies |
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685 // the FullGCCount_lock in case a Java thread is waiting for a full |
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686 // GC to happen (e.g., it called System.gc() with |
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687 // +ExplicitGCInvokesConcurrent). |
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688 void increment_full_collections_completed(bool concurrent); |
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689 |
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690 unsigned int full_collections_completed() { |
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691 return _full_collections_completed; |
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692 } |
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693 |
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694 G1HRPrinter* hr_printer() { return &_hr_printer; } |
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695 |
342 | 696 protected: |
697 | |
698 // Shrink the garbage-first heap by at most the given size (in bytes!). | |
699 // (Rounds down to a HeapRegion boundary.) | |
700 virtual void shrink(size_t expand_bytes); | |
701 void shrink_helper(size_t expand_bytes); | |
702 | |
1709 | 703 #if TASKQUEUE_STATS |
704 static void print_taskqueue_stats_hdr(outputStream* const st = gclog_or_tty); | |
705 void print_taskqueue_stats(outputStream* const st = gclog_or_tty) const; | |
706 void reset_taskqueue_stats(); | |
707 #endif // TASKQUEUE_STATS | |
708 | |
1973 | 709 // Schedule the VM operation that will do an evacuation pause to |
710 // satisfy an allocation request of word_size. *succeeded will | |
711 // return whether the VM operation was successful (it did do an | |
712 // evacuation pause) or not (another thread beat us to it or the GC | |
713 // locker was active). Given that we should not be holding the | |
714 // Heap_lock when we enter this method, we will pass the | |
715 // gc_count_before (i.e., total_collections()) as a parameter since | |
716 // it has to be read while holding the Heap_lock. Currently, both | |
717 // methods that call do_collection_pause() release the Heap_lock | |
718 // before the call, so it's easy to read gc_count_before just before. | |
719 HeapWord* do_collection_pause(size_t word_size, | |
720 unsigned int gc_count_before, | |
721 bool* succeeded); | |
342 | 722 |
723 // The guts of the incremental collection pause, executed by the vm | |
1973 | 724 // thread. It returns false if it is unable to do the collection due |
725 // to the GC locker being active, true otherwise | |
726 bool do_collection_pause_at_safepoint(double target_pause_time_ms); | |
342 | 727 |
728 // Actually do the work of evacuating the collection set. | |
1973 | 729 void evacuate_collection_set(); |
342 | 730 |
731 // The g1 remembered set of the heap. | |
732 G1RemSet* _g1_rem_set; | |
733 // And it's mod ref barrier set, used to track updates for the above. | |
734 ModRefBarrierSet* _mr_bs; | |
735 | |
616
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736 // A set of cards that cover the objects for which the Rsets should be updated |
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737 // concurrently after the collection. |
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738 DirtyCardQueueSet _dirty_card_queue_set; |
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739 |
342 | 740 // The Heap Region Rem Set Iterator. |
741 HeapRegionRemSetIterator** _rem_set_iterator; | |
742 | |
743 // The closure used to refine a single card. | |
744 RefineCardTableEntryClosure* _refine_cte_cl; | |
745 | |
746 // A function to check the consistency of dirty card logs. | |
747 void check_ct_logs_at_safepoint(); | |
748 | |
1705 | 749 // A DirtyCardQueueSet that is used to hold cards that contain |
750 // references into the current collection set. This is used to | |
751 // update the remembered sets of the regions in the collection | |
752 // set in the event of an evacuation failure. | |
753 DirtyCardQueueSet _into_cset_dirty_card_queue_set; | |
754 | |
342 | 755 // After a collection pause, make the regions in the CS into free |
756 // regions. | |
757 void free_collection_set(HeapRegion* cs_head); | |
758 | |
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759 // Abandon the current collection set without recording policy |
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760 // statistics or updating free lists. |
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761 void abandon_collection_set(HeapRegion* cs_head); |
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762 |
342 | 763 // Applies "scan_non_heap_roots" to roots outside the heap, |
764 // "scan_rs" to roots inside the heap (having done "set_region" to | |
765 // indicate the region in which the root resides), and does "scan_perm" | |
766 // (setting the generation to the perm generation.) If "scan_rs" is | |
767 // NULL, then this step is skipped. The "worker_i" | |
768 // param is for use with parallel roots processing, and should be | |
769 // the "i" of the calling parallel worker thread's work(i) function. | |
770 // In the sequential case this param will be ignored. | |
771 void g1_process_strong_roots(bool collecting_perm_gen, | |
772 SharedHeap::ScanningOption so, | |
773 OopClosure* scan_non_heap_roots, | |
774 OopsInHeapRegionClosure* scan_rs, | |
775 OopsInGenClosure* scan_perm, | |
776 int worker_i); | |
777 | |
778 // Apply "blk" to all the weak roots of the system. These include | |
779 // JNI weak roots, the code cache, system dictionary, symbol table, | |
780 // string table, and referents of reachable weak refs. | |
781 void g1_process_weak_roots(OopClosure* root_closure, | |
782 OopClosure* non_root_closure); | |
783 | |
2361 | 784 // Frees a non-humongous region by initializing its contents and |
2152 | 785 // adding it to the free list that's passed as a parameter (this is |
786 // usually a local list which will be appended to the master free | |
787 // list later). The used bytes of freed regions are accumulated in | |
788 // pre_used. If par is true, the region's RSet will not be freed | |
789 // up. The assumption is that this will be done later. | |
790 void free_region(HeapRegion* hr, | |
791 size_t* pre_used, | |
792 FreeRegionList* free_list, | |
793 bool par); | |
342 | 794 |
2361 | 795 // Frees a humongous region by collapsing it into individual regions |
796 // and calling free_region() for each of them. The freed regions | |
797 // will be added to the free list that's passed as a parameter (this | |
798 // is usually a local list which will be appended to the master free | |
799 // list later). The used bytes of freed regions are accumulated in | |
800 // pre_used. If par is true, the region's RSet will not be freed | |
801 // up. The assumption is that this will be done later. | |
2152 | 802 void free_humongous_region(HeapRegion* hr, |
803 size_t* pre_used, | |
804 FreeRegionList* free_list, | |
805 HumongousRegionSet* humongous_proxy_set, | |
806 bool par); | |
342 | 807 |
3766 | 808 // Notifies all the necessary spaces that the committed space has |
809 // been updated (either expanded or shrunk). It should be called | |
810 // after _g1_storage is updated. | |
811 void update_committed_space(HeapWord* old_end, HeapWord* new_end); | |
812 | |
342 | 813 // The concurrent marker (and the thread it runs in.) |
814 ConcurrentMark* _cm; | |
815 ConcurrentMarkThread* _cmThread; | |
816 bool _mark_in_progress; | |
817 | |
818 // The concurrent refiner. | |
819 ConcurrentG1Refine* _cg1r; | |
820 | |
821 // The parallel task queues | |
822 RefToScanQueueSet *_task_queues; | |
823 | |
824 // True iff a evacuation has failed in the current collection. | |
825 bool _evacuation_failed; | |
826 | |
827 // Set the attribute indicating whether evacuation has failed in the | |
828 // current collection. | |
829 void set_evacuation_failed(bool b) { _evacuation_failed = b; } | |
830 | |
831 // Failed evacuations cause some logical from-space objects to have | |
832 // forwarding pointers to themselves. Reset them. | |
833 void remove_self_forwarding_pointers(); | |
834 | |
835 // When one is non-null, so is the other. Together, they each pair is | |
836 // an object with a preserved mark, and its mark value. | |
837 GrowableArray<oop>* _objs_with_preserved_marks; | |
838 GrowableArray<markOop>* _preserved_marks_of_objs; | |
839 | |
840 // Preserve the mark of "obj", if necessary, in preparation for its mark | |
841 // word being overwritten with a self-forwarding-pointer. | |
842 void preserve_mark_if_necessary(oop obj, markOop m); | |
843 | |
844 // The stack of evac-failure objects left to be scanned. | |
845 GrowableArray<oop>* _evac_failure_scan_stack; | |
846 // The closure to apply to evac-failure objects. | |
847 | |
848 OopsInHeapRegionClosure* _evac_failure_closure; | |
849 // Set the field above. | |
850 void | |
851 set_evac_failure_closure(OopsInHeapRegionClosure* evac_failure_closure) { | |
852 _evac_failure_closure = evac_failure_closure; | |
853 } | |
854 | |
855 // Push "obj" on the scan stack. | |
856 void push_on_evac_failure_scan_stack(oop obj); | |
857 // Process scan stack entries until the stack is empty. | |
858 void drain_evac_failure_scan_stack(); | |
859 // True iff an invocation of "drain_scan_stack" is in progress; to | |
860 // prevent unnecessary recursion. | |
861 bool _drain_in_progress; | |
862 | |
863 // Do any necessary initialization for evacuation-failure handling. | |
864 // "cl" is the closure that will be used to process evac-failure | |
865 // objects. | |
866 void init_for_evac_failure(OopsInHeapRegionClosure* cl); | |
867 // Do any necessary cleanup for evacuation-failure handling data | |
868 // structures. | |
869 void finalize_for_evac_failure(); | |
870 | |
871 // An attempt to evacuate "obj" has failed; take necessary steps. | |
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872 oop handle_evacuation_failure_par(OopsInHeapRegionClosure* cl, oop obj, |
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873 bool should_mark_root); |
342 | 874 void handle_evacuation_failure_common(oop obj, markOop m); |
875 | |
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876 // ("Weak") Reference processing support. |
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877 // |
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878 // G1 has 2 instances of the referece processor class. One |
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879 // (_ref_processor_cm) handles reference object discovery |
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880 // and subsequent processing during concurrent marking cycles. |
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881 // |
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882 // The other (_ref_processor_stw) handles reference object |
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883 // discovery and processing during full GCs and incremental |
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884 // evacuation pauses. |
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885 // |
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886 // During an incremental pause, reference discovery will be |
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887 // temporarily disabled for _ref_processor_cm and will be |
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888 // enabled for _ref_processor_stw. At the end of the evacuation |
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889 // pause references discovered by _ref_processor_stw will be |
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890 // processed and discovery will be disabled. The previous |
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891 // setting for reference object discovery for _ref_processor_cm |
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892 // will be re-instated. |
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893 // |
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894 // At the start of marking: |
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895 // * Discovery by the CM ref processor is verified to be inactive |
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896 // and it's discovered lists are empty. |
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897 // * Discovery by the CM ref processor is then enabled. |
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898 // |
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899 // At the end of marking: |
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900 // * Any references on the CM ref processor's discovered |
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901 // lists are processed (possibly MT). |
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902 // |
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903 // At the start of full GC we: |
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904 // * Disable discovery by the CM ref processor and |
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905 // empty CM ref processor's discovered lists |
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906 // (without processing any entries). |
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907 // * Verify that the STW ref processor is inactive and it's |
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908 // discovered lists are empty. |
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909 // * Temporarily set STW ref processor discovery as single threaded. |
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910 // * Temporarily clear the STW ref processor's _is_alive_non_header |
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911 // field. |
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912 // * Finally enable discovery by the STW ref processor. |
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913 // |
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914 // The STW ref processor is used to record any discovered |
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915 // references during the full GC. |
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916 // |
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917 // At the end of a full GC we: |
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918 // * Enqueue any reference objects discovered by the STW ref processor |
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919 // that have non-live referents. This has the side-effect of |
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920 // making the STW ref processor inactive by disabling discovery. |
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921 // * Verify that the CM ref processor is still inactive |
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922 // and no references have been placed on it's discovered |
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923 // lists (also checked as a precondition during initial marking). |
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924 |
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925 // The (stw) reference processor... |
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926 ReferenceProcessor* _ref_processor_stw; |
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927 |
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928 // During reference object discovery, the _is_alive_non_header |
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929 // closure (if non-null) is applied to the referent object to |
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930 // determine whether the referent is live. If so then the |
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931 // reference object does not need to be 'discovered' and can |
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932 // be treated as a regular oop. This has the benefit of reducing |
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933 // the number of 'discovered' reference objects that need to |
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934 // be processed. |
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935 // |
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936 // Instance of the is_alive closure for embedding into the |
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937 // STW reference processor as the _is_alive_non_header field. |
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938 // Supplying a value for the _is_alive_non_header field is |
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939 // optional but doing so prevents unnecessary additions to |
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940 // the discovered lists during reference discovery. |
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941 G1STWIsAliveClosure _is_alive_closure_stw; |
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942 |
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943 // The (concurrent marking) reference processor... |
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944 ReferenceProcessor* _ref_processor_cm; |
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945 |
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946 // Instance of the concurrent mark is_alive closure for embedding |
3979
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947 // into the Concurrent Marking reference processor as the |
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948 // _is_alive_non_header field. Supplying a value for the |
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949 // _is_alive_non_header field is optional but doing so prevents |
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950 // unnecessary additions to the discovered lists during reference |
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951 // discovery. |
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952 G1CMIsAliveClosure _is_alive_closure_cm; |
342 | 953 |
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954 // Cache used by G1CollectedHeap::start_cset_region_for_worker(). |
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955 HeapRegion** _worker_cset_start_region; |
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956 |
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957 // Time stamp to validate the regions recorded in the cache |
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958 // used by G1CollectedHeap::start_cset_region_for_worker(). |
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959 // The heap region entry for a given worker is valid iff |
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960 // the associated time stamp value matches the current value |
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961 // of G1CollectedHeap::_gc_time_stamp. |
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962 unsigned int* _worker_cset_start_region_time_stamp; |
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963 |
342 | 964 enum G1H_process_strong_roots_tasks { |
965 G1H_PS_mark_stack_oops_do, | |
966 G1H_PS_refProcessor_oops_do, | |
967 // Leave this one last. | |
968 G1H_PS_NumElements | |
969 }; | |
970 | |
971 SubTasksDone* _process_strong_tasks; | |
972 | |
2152 | 973 volatile bool _free_regions_coming; |
342 | 974 |
975 public: | |
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976 |
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977 SubTasksDone* process_strong_tasks() { return _process_strong_tasks; } |
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978 |
342 | 979 void set_refine_cte_cl_concurrency(bool concurrent); |
980 | |
1709 | 981 RefToScanQueue *task_queue(int i) const; |
342 | 982 |
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983 // A set of cards where updates happened during the GC |
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984 DirtyCardQueueSet& dirty_card_queue_set() { return _dirty_card_queue_set; } |
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985 |
1705 | 986 // A DirtyCardQueueSet that is used to hold cards that contain |
987 // references into the current collection set. This is used to | |
988 // update the remembered sets of the regions in the collection | |
989 // set in the event of an evacuation failure. | |
990 DirtyCardQueueSet& into_cset_dirty_card_queue_set() | |
991 { return _into_cset_dirty_card_queue_set; } | |
992 | |
342 | 993 // Create a G1CollectedHeap with the specified policy. |
994 // Must call the initialize method afterwards. | |
995 // May not return if something goes wrong. | |
996 G1CollectedHeap(G1CollectorPolicy* policy); | |
997 | |
998 // Initialize the G1CollectedHeap to have the initial and | |
999 // maximum sizes, permanent generation, and remembered and barrier sets | |
1000 // specified by the policy object. | |
1001 jint initialize(); | |
1002 | |
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1003 // Initialize weak reference processing. |
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1004 virtual void ref_processing_init(); |
342 | 1005 |
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1006 void set_par_threads(uint t) { |
342 | 1007 SharedHeap::set_par_threads(t); |
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1008 // Done in SharedHeap but oddly there are |
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1009 // two _process_strong_tasks's in a G1CollectedHeap |
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1010 // so do it here too. |
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1011 _process_strong_tasks->set_n_threads(t); |
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1012 } |
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1013 |
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1014 // Set _n_par_threads according to a policy TBD. |
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1015 void set_par_threads(); |
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1016 |
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1017 void set_n_termination(int t) { |
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1018 _process_strong_tasks->set_n_threads(t); |
342 | 1019 } |
1020 | |
1021 virtual CollectedHeap::Name kind() const { | |
1022 return CollectedHeap::G1CollectedHeap; | |
1023 } | |
1024 | |
1025 // The current policy object for the collector. | |
1026 G1CollectorPolicy* g1_policy() const { return _g1_policy; } | |
1027 | |
1028 // Adaptive size policy. No such thing for g1. | |
1029 virtual AdaptiveSizePolicy* size_policy() { return NULL; } | |
1030 | |
1031 // The rem set and barrier set. | |
1032 G1RemSet* g1_rem_set() const { return _g1_rem_set; } | |
1033 ModRefBarrierSet* mr_bs() const { return _mr_bs; } | |
1034 | |
1035 // The rem set iterator. | |
1036 HeapRegionRemSetIterator* rem_set_iterator(int i) { | |
1037 return _rem_set_iterator[i]; | |
1038 } | |
1039 | |
1040 HeapRegionRemSetIterator* rem_set_iterator() { | |
1041 return _rem_set_iterator[0]; | |
1042 } | |
1043 | |
1044 unsigned get_gc_time_stamp() { | |
1045 return _gc_time_stamp; | |
1046 } | |
1047 | |
1048 void reset_gc_time_stamp() { | |
1049 _gc_time_stamp = 0; | |
353
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1050 OrderAccess::fence(); |
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1051 // Clear the cached CSet starting regions and time stamps. |
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1052 // Their validity is dependent on the GC timestamp. |
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1053 clear_cset_start_regions(); |
353
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1054 } |
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1055 |
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1056 void increment_gc_time_stamp() { |
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1057 ++_gc_time_stamp; |
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1058 OrderAccess::fence(); |
342 | 1059 } |
1060 | |
1705 | 1061 void iterate_dirty_card_closure(CardTableEntryClosure* cl, |
1062 DirtyCardQueue* into_cset_dcq, | |
1063 bool concurrent, int worker_i); | |
342 | 1064 |
1065 // The shared block offset table array. | |
1066 G1BlockOffsetSharedArray* bot_shared() const { return _bot_shared; } | |
1067 | |
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1068 // Reference Processing accessors |
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1069 |
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1070 // The STW reference processor.... |
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1071 ReferenceProcessor* ref_processor_stw() const { return _ref_processor_stw; } |
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1072 |
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1073 // The Concurent Marking reference processor... |
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1074 ReferenceProcessor* ref_processor_cm() const { return _ref_processor_cm; } |
342 | 1075 |
1076 virtual size_t capacity() const; | |
1077 virtual size_t used() const; | |
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1078 // This should be called when we're not holding the heap lock. The |
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1079 // result might be a bit inaccurate. |
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1080 size_t used_unlocked() const; |
342 | 1081 size_t recalculate_used() const; |
1082 | |
1083 // These virtual functions do the actual allocation. | |
1084 // Some heaps may offer a contiguous region for shared non-blocking | |
1085 // allocation, via inlined code (by exporting the address of the top and | |
1086 // end fields defining the extent of the contiguous allocation region.) | |
1087 // But G1CollectedHeap doesn't yet support this. | |
1088 | |
1089 // Return an estimate of the maximum allocation that could be performed | |
1090 // without triggering any collection or expansion activity. In a | |
1091 // generational collector, for example, this is probably the largest | |
1092 // allocation that could be supported (without expansion) in the youngest | |
1093 // generation. It is "unsafe" because no locks are taken; the result | |
1094 // should be treated as an approximation, not a guarantee, for use in | |
1095 // heuristic resizing decisions. | |
1096 virtual size_t unsafe_max_alloc(); | |
1097 | |
1098 virtual bool is_maximal_no_gc() const { | |
1099 return _g1_storage.uncommitted_size() == 0; | |
1100 } | |
1101 | |
1102 // The total number of regions in the heap. | |
3766 | 1103 size_t n_regions() { return _hrs.length(); } |
1104 | |
1105 // The max number of regions in the heap. | |
1106 size_t max_regions() { return _hrs.max_length(); } | |
342 | 1107 |
1108 // The number of regions that are completely free. | |
3766 | 1109 size_t free_regions() { return _free_list.length(); } |
342 | 1110 |
1111 // The number of regions that are not completely free. | |
1112 size_t used_regions() { return n_regions() - free_regions(); } | |
1113 | |
1114 // The number of regions available for "regular" expansion. | |
1115 size_t expansion_regions() { return _expansion_regions; } | |
1116 | |
3766 | 1117 // Factory method for HeapRegion instances. It will return NULL if |
1118 // the allocation fails. | |
1119 HeapRegion* new_heap_region(size_t hrs_index, HeapWord* bottom); | |
1120 | |
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1121 void verify_not_dirty_region(HeapRegion* hr) PRODUCT_RETURN; |
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1122 void verify_dirty_region(HeapRegion* hr) PRODUCT_RETURN; |
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1123 void verify_dirty_young_list(HeapRegion* head) PRODUCT_RETURN; |
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1124 void verify_dirty_young_regions() PRODUCT_RETURN; |
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1125 |
2152 | 1126 // verify_region_sets() performs verification over the region |
1127 // lists. It will be compiled in the product code to be used when | |
1128 // necessary (i.e., during heap verification). | |
1129 void verify_region_sets(); | |
342 | 1130 |
2152 | 1131 // verify_region_sets_optional() is planted in the code for |
1132 // list verification in non-product builds (and it can be enabled in | |
1133 // product builds by definning HEAP_REGION_SET_FORCE_VERIFY to be 1). | |
1134 #if HEAP_REGION_SET_FORCE_VERIFY | |
1135 void verify_region_sets_optional() { | |
1136 verify_region_sets(); | |
1137 } | |
1138 #else // HEAP_REGION_SET_FORCE_VERIFY | |
1139 void verify_region_sets_optional() { } | |
1140 #endif // HEAP_REGION_SET_FORCE_VERIFY | |
342 | 1141 |
2152 | 1142 #ifdef ASSERT |
2361 | 1143 bool is_on_master_free_list(HeapRegion* hr) { |
2152 | 1144 return hr->containing_set() == &_free_list; |
1145 } | |
342 | 1146 |
2361 | 1147 bool is_in_humongous_set(HeapRegion* hr) { |
2152 | 1148 return hr->containing_set() == &_humongous_set; |
2361 | 1149 } |
2152 | 1150 #endif // ASSERT |
342 | 1151 |
2152 | 1152 // Wrapper for the region list operations that can be called from |
1153 // methods outside this class. | |
342 | 1154 |
2152 | 1155 void secondary_free_list_add_as_tail(FreeRegionList* list) { |
1156 _secondary_free_list.add_as_tail(list); | |
1157 } | |
342 | 1158 |
2152 | 1159 void append_secondary_free_list() { |
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1160 _free_list.add_as_head(&_secondary_free_list); |
2152 | 1161 } |
342 | 1162 |
2361 | 1163 void append_secondary_free_list_if_not_empty_with_lock() { |
1164 // If the secondary free list looks empty there's no reason to | |
1165 // take the lock and then try to append it. | |
2152 | 1166 if (!_secondary_free_list.is_empty()) { |
1167 MutexLockerEx x(SecondaryFreeList_lock, Mutex::_no_safepoint_check_flag); | |
1168 append_secondary_free_list(); | |
1169 } | |
1170 } | |
342 | 1171 |
4072 | 1172 void old_set_remove(HeapRegion* hr) { |
1173 _old_set.remove(hr); | |
1174 } | |
1175 | |
2152 | 1176 void set_free_regions_coming(); |
1177 void reset_free_regions_coming(); | |
1178 bool free_regions_coming() { return _free_regions_coming; } | |
1179 void wait_while_free_regions_coming(); | |
342 | 1180 |
1181 // Perform a collection of the heap; intended for use in implementing | |
1182 // "System.gc". This probably implies as full a collection as the | |
1183 // "CollectedHeap" supports. | |
1184 virtual void collect(GCCause::Cause cause); | |
1185 | |
1186 // The same as above but assume that the caller holds the Heap_lock. | |
1187 void collect_locked(GCCause::Cause cause); | |
1188 | |
1189 // This interface assumes that it's being called by the | |
1190 // vm thread. It collects the heap assuming that the | |
1191 // heap lock is already held and that we are executing in | |
1192 // the context of the vm thread. | |
1193 virtual void collect_as_vm_thread(GCCause::Cause cause); | |
1194 | |
1195 // True iff a evacuation has failed in the most-recent collection. | |
1196 bool evacuation_failed() { return _evacuation_failed; } | |
1197 | |
2152 | 1198 // It will free a region if it has allocated objects in it that are |
1199 // all dead. It calls either free_region() or | |
1200 // free_humongous_region() depending on the type of the region that | |
1201 // is passed to it. | |
2173 | 1202 void free_region_if_empty(HeapRegion* hr, |
1203 size_t* pre_used, | |
1204 FreeRegionList* free_list, | |
4072 | 1205 OldRegionSet* old_proxy_set, |
2173 | 1206 HumongousRegionSet* humongous_proxy_set, |
1207 HRRSCleanupTask* hrrs_cleanup_task, | |
1208 bool par); | |
342 | 1209 |
2152 | 1210 // It appends the free list to the master free list and updates the |
1211 // master humongous list according to the contents of the proxy | |
1212 // list. It also adjusts the total used bytes according to pre_used | |
1213 // (if par is true, it will do so by taking the ParGCRareEvent_lock). | |
1214 void update_sets_after_freeing_regions(size_t pre_used, | |
1215 FreeRegionList* free_list, | |
4072 | 1216 OldRegionSet* old_proxy_set, |
2152 | 1217 HumongousRegionSet* humongous_proxy_set, |
1218 bool par); | |
342 | 1219 |
4708 | 1220 // Returns "TRUE" iff "p" points into the committed areas of the heap. |
342 | 1221 virtual bool is_in(const void* p) const; |
1222 | |
1223 // Return "TRUE" iff the given object address is within the collection | |
1224 // set. | |
1225 inline bool obj_in_cs(oop obj); | |
1226 | |
1227 // Return "TRUE" iff the given object address is in the reserved | |
1228 // region of g1 (excluding the permanent generation). | |
1229 bool is_in_g1_reserved(const void* p) const { | |
1230 return _g1_reserved.contains(p); | |
1231 } | |
1232 | |
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1233 // Returns a MemRegion that corresponds to the space that has been |
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1234 // reserved for the heap |
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1235 MemRegion g1_reserved() { |
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1236 return _g1_reserved; |
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1237 } |
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1238 |
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1239 // Returns a MemRegion that corresponds to the space that has been |
342 | 1240 // committed in the heap |
1241 MemRegion g1_committed() { | |
1242 return _g1_committed; | |
1243 } | |
1244 | |
2311 | 1245 virtual bool is_in_closed_subset(const void* p) const; |
342 | 1246 |
1247 // This resets the card table to all zeros. It is used after | |
1248 // a collection pause which used the card table to claim cards. | |
1249 void cleanUpCardTable(); | |
1250 | |
1251 // Iteration functions. | |
1252 | |
1253 // Iterate over all the ref-containing fields of all objects, calling | |
1254 // "cl.do_oop" on each. | |
678 | 1255 virtual void oop_iterate(OopClosure* cl) { |
1256 oop_iterate(cl, true); | |
1257 } | |
1258 void oop_iterate(OopClosure* cl, bool do_perm); | |
342 | 1259 |
1260 // Same as above, restricted to a memory region. | |
678 | 1261 virtual void oop_iterate(MemRegion mr, OopClosure* cl) { |
1262 oop_iterate(mr, cl, true); | |
1263 } | |
1264 void oop_iterate(MemRegion mr, OopClosure* cl, bool do_perm); | |
342 | 1265 |
1266 // Iterate over all objects, calling "cl.do_object" on each. | |
678 | 1267 virtual void object_iterate(ObjectClosure* cl) { |
1268 object_iterate(cl, true); | |
1269 } | |
1270 virtual void safe_object_iterate(ObjectClosure* cl) { | |
1271 object_iterate(cl, true); | |
1272 } | |
1273 void object_iterate(ObjectClosure* cl, bool do_perm); | |
342 | 1274 |
1275 // Iterate over all objects allocated since the last collection, calling | |
1276 // "cl.do_object" on each. The heap must have been initialized properly | |
1277 // to support this function, or else this call will fail. | |
1278 virtual void object_iterate_since_last_GC(ObjectClosure* cl); | |
1279 | |
1280 // Iterate over all spaces in use in the heap, in ascending address order. | |
1281 virtual void space_iterate(SpaceClosure* cl); | |
1282 | |
1283 // Iterate over heap regions, in address order, terminating the | |
1284 // iteration early if the "doHeapRegion" method returns "true". | |
3766 | 1285 void heap_region_iterate(HeapRegionClosure* blk) const; |
342 | 1286 |
1287 // Iterate over heap regions starting with r (or the first region if "r" | |
1288 // is NULL), in address order, terminating early if the "doHeapRegion" | |
1289 // method returns "true". | |
3766 | 1290 void heap_region_iterate_from(HeapRegion* r, HeapRegionClosure* blk) const; |
342 | 1291 |
3766 | 1292 // Return the region with the given index. It assumes the index is valid. |
1293 HeapRegion* region_at(size_t index) const { return _hrs.at(index); } | |
342 | 1294 |
1295 // Divide the heap region sequence into "chunks" of some size (the number | |
1296 // of regions divided by the number of parallel threads times some | |
1297 // overpartition factor, currently 4). Assumes that this will be called | |
1298 // in parallel by ParallelGCThreads worker threads with discinct worker | |
1299 // ids in the range [0..max(ParallelGCThreads-1, 1)], that all parallel | |
1300 // calls will use the same "claim_value", and that that claim value is | |
1301 // different from the claim_value of any heap region before the start of | |
1302 // the iteration. Applies "blk->doHeapRegion" to each of the regions, by | |
1303 // attempting to claim the first region in each chunk, and, if | |
1304 // successful, applying the closure to each region in the chunk (and | |
1305 // setting the claim value of the second and subsequent regions of the | |
1306 // chunk.) For now requires that "doHeapRegion" always returns "false", | |
1307 // i.e., that a closure never attempt to abort a traversal. | |
1308 void heap_region_par_iterate_chunked(HeapRegionClosure* blk, | |
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1309 uint worker, |
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1310 uint no_of_par_workers, |
342 | 1311 jint claim_value); |
1312 | |
390 | 1313 // It resets all the region claim values to the default. |
1314 void reset_heap_region_claim_values(); | |
1315 | |
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1316 // Resets the claim values of regions in the current |
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1317 // collection set to the default. |
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1318 void reset_cset_heap_region_claim_values(); |
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1319 |
355 | 1320 #ifdef ASSERT |
1321 bool check_heap_region_claim_values(jint claim_value); | |
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1322 |
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1323 // Same as the routine above but only checks regions in the |
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1324 // current collection set. |
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1325 bool check_cset_heap_region_claim_values(jint claim_value); |
355 | 1326 #endif // ASSERT |
1327 | |
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1328 // Clear the cached cset start regions and (more importantly) |
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1329 // the time stamps. Called when we reset the GC time stamp. |
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1330 void clear_cset_start_regions(); |
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1331 |
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1332 // Given the id of a worker, obtain or calculate a suitable |
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1333 // starting region for iterating over the current collection set. |
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1334 HeapRegion* start_cset_region_for_worker(int worker_i); |
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1335 |
342 | 1336 // Iterate over the regions (if any) in the current collection set. |
1337 void collection_set_iterate(HeapRegionClosure* blk); | |
1338 | |
1339 // As above but starting from region r | |
1340 void collection_set_iterate_from(HeapRegion* r, HeapRegionClosure *blk); | |
1341 | |
1342 // Returns the first (lowest address) compactible space in the heap. | |
1343 virtual CompactibleSpace* first_compactible_space(); | |
1344 | |
1345 // A CollectedHeap will contain some number of spaces. This finds the | |
1346 // space containing a given address, or else returns NULL. | |
1347 virtual Space* space_containing(const void* addr) const; | |
1348 | |
1349 // A G1CollectedHeap will contain some number of heap regions. This | |
1350 // finds the region containing a given address, or else returns NULL. | |
3766 | 1351 template <class T> |
1352 inline HeapRegion* heap_region_containing(const T addr) const; | |
342 | 1353 |
1354 // Like the above, but requires "addr" to be in the heap (to avoid a | |
1355 // null-check), and unlike the above, may return an continuing humongous | |
1356 // region. | |
3766 | 1357 template <class T> |
1358 inline HeapRegion* heap_region_containing_raw(const T addr) const; | |
342 | 1359 |
1360 // A CollectedHeap is divided into a dense sequence of "blocks"; that is, | |
1361 // each address in the (reserved) heap is a member of exactly | |
1362 // one block. The defining characteristic of a block is that it is | |
1363 // possible to find its size, and thus to progress forward to the next | |
1364 // block. (Blocks may be of different sizes.) Thus, blocks may | |
1365 // represent Java objects, or they might be free blocks in a | |
1366 // free-list-based heap (or subheap), as long as the two kinds are | |
1367 // distinguishable and the size of each is determinable. | |
1368 | |
1369 // Returns the address of the start of the "block" that contains the | |
1370 // address "addr". We say "blocks" instead of "object" since some heaps | |
1371 // may not pack objects densely; a chunk may either be an object or a | |
1372 // non-object. | |
1373 virtual HeapWord* block_start(const void* addr) const; | |
1374 | |
1375 // Requires "addr" to be the start of a chunk, and returns its size. | |
1376 // "addr + size" is required to be the start of a new chunk, or the end | |
1377 // of the active area of the heap. | |
1378 virtual size_t block_size(const HeapWord* addr) const; | |
1379 | |
1380 // Requires "addr" to be the start of a block, and returns "TRUE" iff | |
1381 // the block is an object. | |
1382 virtual bool block_is_obj(const HeapWord* addr) const; | |
1383 | |
1384 // Does this heap support heap inspection? (+PrintClassHistogram) | |
1385 virtual bool supports_heap_inspection() const { return true; } | |
1386 | |
1387 // Section on thread-local allocation buffers (TLABs) | |
1388 // See CollectedHeap for semantics. | |
1389 | |
1390 virtual bool supports_tlab_allocation() const; | |
1391 virtual size_t tlab_capacity(Thread* thr) const; | |
1392 virtual size_t unsafe_max_tlab_alloc(Thread* thr) const; | |
1393 | |
1394 // Can a compiler initialize a new object without store barriers? | |
1395 // This permission only extends from the creation of a new object | |
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1396 // via a TLAB up to the first subsequent safepoint. If such permission |
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1397 // is granted for this heap type, the compiler promises to call |
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1398 // defer_store_barrier() below on any slow path allocation of |
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1399 // a new object for which such initializing store barriers will |
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1400 // have been elided. G1, like CMS, allows this, but should be |
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1401 // ready to provide a compensating write barrier as necessary |
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1402 // if that storage came out of a non-young region. The efficiency |
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1403 // of this implementation depends crucially on being able to |
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1404 // answer very efficiently in constant time whether a piece of |
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1405 // storage in the heap comes from a young region or not. |
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1406 // See ReduceInitialCardMarks. |
342 | 1407 virtual bool can_elide_tlab_store_barriers() const { |
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1408 return true; |
1027
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1409 } |
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1410 |
1166 | 1411 virtual bool card_mark_must_follow_store() const { |
1412 return true; | |
1413 } | |
1414 | |
3766 | 1415 bool is_in_young(const oop obj) { |
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1416 HeapRegion* hr = heap_region_containing(obj); |
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1417 return hr != NULL && hr->is_young(); |
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1418 } |
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1419 |
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1420 #ifdef ASSERT |
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1421 virtual bool is_in_partial_collection(const void* p); |
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1422 #endif |
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1423 |
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1424 virtual bool is_scavengable(const void* addr); |
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1425 |
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1426 // We don't need barriers for initializing stores to objects |
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1427 // in the young gen: for the SATB pre-barrier, there is no |
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1428 // pre-value that needs to be remembered; for the remembered-set |
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1429 // update logging post-barrier, we don't maintain remembered set |
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1430 // information for young gen objects. |
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1431 virtual bool can_elide_initializing_store_barrier(oop new_obj) { |
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1432 return is_in_young(new_obj); |
342 | 1433 } |
1434 | |
1435 // Can a compiler elide a store barrier when it writes | |
1436 // a permanent oop into the heap? Applies when the compiler | |
1437 // is storing x to the heap, where x->is_perm() is true. | |
1438 virtual bool can_elide_permanent_oop_store_barriers() const { | |
1439 // At least until perm gen collection is also G1-ified, at | |
1440 // which point this should return false. | |
1441 return true; | |
1442 } | |
1443 | |
1444 // Returns "true" iff the given word_size is "very large". | |
1445 static bool isHumongous(size_t word_size) { | |
1313
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1446 // Note this has to be strictly greater-than as the TLABs |
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1447 // are capped at the humongous thresold and we want to |
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1448 // ensure that we don't try to allocate a TLAB as |
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1449 // humongous and that we don't allocate a humongous |
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1450 // object in a TLAB. |
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1451 return word_size > _humongous_object_threshold_in_words; |
342 | 1452 } |
1453 | |
1454 // Update mod union table with the set of dirty cards. | |
1455 void updateModUnion(); | |
1456 | |
1457 // Set the mod union bits corresponding to the given memRegion. Note | |
1458 // that this is always a safe operation, since it doesn't clear any | |
1459 // bits. | |
1460 void markModUnionRange(MemRegion mr); | |
1461 | |
1462 // Records the fact that a marking phase is no longer in progress. | |
1463 void set_marking_complete() { | |
1464 _mark_in_progress = false; | |
1465 } | |
1466 void set_marking_started() { | |
1467 _mark_in_progress = true; | |
1468 } | |
1469 bool mark_in_progress() { | |
1470 return _mark_in_progress; | |
1471 } | |
1472 | |
1473 // Print the maximum heap capacity. | |
1474 virtual size_t max_capacity() const; | |
1475 | |
1476 virtual jlong millis_since_last_gc(); | |
1477 | |
1478 // Perform any cleanup actions necessary before allowing a verification. | |
1479 virtual void prepare_for_verify(); | |
1480 | |
1481 // Perform verification. | |
811 | 1482 |
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1483 // vo == UsePrevMarking -> use "prev" marking information, |
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1484 // vo == UseNextMarking -> use "next" marking information |
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1485 // vo == UseMarkWord -> use the mark word in the object header |
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1486 // |
811 | 1487 // NOTE: Only the "prev" marking information is guaranteed to be |
1488 // consistent most of the time, so most calls to this should use | |
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1489 // vo == UsePrevMarking. |
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1490 // Currently, there is only one case where this is called with |
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1491 // vo == UseNextMarking, which is to verify the "next" marking |
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1492 // information at the end of remark. |
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1493 // Currently there is only one place where this is called with |
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1494 // vo == UseMarkWord, which is to verify the marking during a |
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1495 // full GC. |
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1496 void verify(bool allow_dirty, bool silent, VerifyOption vo); |
811 | 1497 |
1498 // Override; it uses the "prev" marking information | |
342 | 1499 virtual void verify(bool allow_dirty, bool silent); |
1500 virtual void print_on(outputStream* st) const; | |
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1501 virtual void print_extended_on(outputStream* st) const; |
342 | 1502 |
1503 virtual void print_gc_threads_on(outputStream* st) const; | |
1504 virtual void gc_threads_do(ThreadClosure* tc) const; | |
1505 | |
1506 // Override | |
1507 void print_tracing_info() const; | |
1508 | |
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1509 // The following two methods are helpful for debugging RSet issues. |
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1510 void print_cset_rsets() PRODUCT_RETURN; |
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1511 void print_all_rsets() PRODUCT_RETURN; |
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1512 |
342 | 1513 // Convenience function to be used in situations where the heap type can be |
1514 // asserted to be this type. | |
1515 static G1CollectedHeap* heap(); | |
1516 | |
1517 void set_region_short_lived_locked(HeapRegion* hr); | |
1518 // add appropriate methods for any other surv rate groups | |
1519 | |
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1520 YoungList* young_list() { return _young_list; } |
342 | 1521 |
1522 // debugging | |
1523 bool check_young_list_well_formed() { | |
1524 return _young_list->check_list_well_formed(); | |
1525 } | |
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1526 |
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1527 bool check_young_list_empty(bool check_heap, |
342 | 1528 bool check_sample = true); |
1529 | |
1530 // *** Stuff related to concurrent marking. It's not clear to me that so | |
1531 // many of these need to be public. | |
1532 | |
1533 // The functions below are helper functions that a subclass of | |
1534 // "CollectedHeap" can use in the implementation of its virtual | |
1535 // functions. | |
1536 // This performs a concurrent marking of the live objects in a | |
1537 // bitmap off to the side. | |
1538 void doConcurrentMark(); | |
1539 | |
1540 bool isMarkedPrev(oop obj) const; | |
1541 bool isMarkedNext(oop obj) const; | |
1542 | |
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1543 // vo == UsePrevMarking -> use "prev" marking information, |
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1544 // vo == UseNextMarking -> use "next" marking information, |
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1545 // vo == UseMarkWord -> use mark word from object header |
811 | 1546 bool is_obj_dead_cond(const oop obj, |
1547 const HeapRegion* hr, | |
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1548 const VerifyOption vo) const { |
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1549 |
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1550 switch (vo) { |
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1551 case VerifyOption_G1UsePrevMarking: |
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1552 return is_obj_dead(obj, hr); |
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1553 case VerifyOption_G1UseNextMarking: |
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1554 return is_obj_ill(obj, hr); |
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1555 default: |
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1556 assert(vo == VerifyOption_G1UseMarkWord, "must be"); |
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1557 return !obj->is_gc_marked(); |
811 | 1558 } |
1559 } | |
1560 | |
342 | 1561 // Determine if an object is dead, given the object and also |
1562 // the region to which the object belongs. An object is dead | |
1563 // iff a) it was not allocated since the last mark and b) it | |
1564 // is not marked. | |
1565 | |
1566 bool is_obj_dead(const oop obj, const HeapRegion* hr) const { | |
1567 return | |
1568 !hr->obj_allocated_since_prev_marking(obj) && | |
1569 !isMarkedPrev(obj); | |
1570 } | |
1571 | |
1572 // This is used when copying an object to survivor space. | |
1573 // If the object is marked live, then we mark the copy live. | |
1574 // If the object is allocated since the start of this mark | |
1575 // cycle, then we mark the copy live. | |
1576 // If the object has been around since the previous mark | |
1577 // phase, and hasn't been marked yet during this phase, | |
1578 // then we don't mark it, we just wait for the | |
1579 // current marking cycle to get to it. | |
1580 | |
1581 // This function returns true when an object has been | |
1582 // around since the previous marking and hasn't yet | |
1583 // been marked during this marking. | |
1584 | |
1585 bool is_obj_ill(const oop obj, const HeapRegion* hr) const { | |
1586 return | |
1587 !hr->obj_allocated_since_next_marking(obj) && | |
1588 !isMarkedNext(obj); | |
1589 } | |
1590 | |
1591 // Determine if an object is dead, given only the object itself. | |
1592 // This will find the region to which the object belongs and | |
1593 // then call the region version of the same function. | |
1594 | |
1595 // Added if it is in permanent gen it isn't dead. | |
1596 // Added if it is NULL it isn't dead. | |
1597 | |
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1598 // vo == UsePrevMarking -> use "prev" marking information, |
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1599 // vo == UseNextMarking -> use "next" marking information, |
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1600 // vo == UseMarkWord -> use mark word from object header |
811 | 1601 bool is_obj_dead_cond(const oop obj, |
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1602 const VerifyOption vo) const { |
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1603 |
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1604 switch (vo) { |
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1605 case VerifyOption_G1UsePrevMarking: |
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1606 return is_obj_dead(obj); |
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1607 case VerifyOption_G1UseNextMarking: |
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1608 return is_obj_ill(obj); |
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1609 default: |
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1610 assert(vo == VerifyOption_G1UseMarkWord, "must be"); |
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1611 return !obj->is_gc_marked(); |
811 | 1612 } |
1613 } | |
1614 | |
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1615 bool is_obj_dead(const oop obj) const { |
811 | 1616 const HeapRegion* hr = heap_region_containing(obj); |
342 | 1617 if (hr == NULL) { |
1618 if (Universe::heap()->is_in_permanent(obj)) | |
1619 return false; | |
1620 else if (obj == NULL) return false; | |
1621 else return true; | |
1622 } | |
1623 else return is_obj_dead(obj, hr); | |
1624 } | |
1625 | |
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1626 bool is_obj_ill(const oop obj) const { |
811 | 1627 const HeapRegion* hr = heap_region_containing(obj); |
342 | 1628 if (hr == NULL) { |
1629 if (Universe::heap()->is_in_permanent(obj)) | |
1630 return false; | |
1631 else if (obj == NULL) return false; | |
1632 else return true; | |
1633 } | |
1634 else return is_obj_ill(obj, hr); | |
1635 } | |
1636 | |
1637 // The following is just to alert the verification code | |
1638 // that a full collection has occurred and that the | |
1639 // remembered sets are no longer up to date. | |
1640 bool _full_collection; | |
1641 void set_full_collection() { _full_collection = true;} | |
1642 void clear_full_collection() {_full_collection = false;} | |
1643 bool full_collection() {return _full_collection;} | |
1644 | |
1645 ConcurrentMark* concurrent_mark() const { return _cm; } | |
1646 ConcurrentG1Refine* concurrent_g1_refine() const { return _cg1r; } | |
1647 | |
796
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1648 // The dirty cards region list is used to record a subset of regions |
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1649 // whose cards need clearing. The list if populated during the |
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1650 // remembered set scanning and drained during the card table |
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1651 // cleanup. Although the methods are reentrant, population/draining |
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1652 // phases must not overlap. For synchronization purposes the last |
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1653 // element on the list points to itself. |
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1654 HeapRegion* _dirty_cards_region_list; |
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1655 void push_dirty_cards_region(HeapRegion* hr); |
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1656 HeapRegion* pop_dirty_cards_region(); |
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1657 |
342 | 1658 public: |
1659 void stop_conc_gc_threads(); | |
1660 | |
1661 double predict_region_elapsed_time_ms(HeapRegion* hr, bool young); | |
1662 void check_if_region_is_too_expensive(double predicted_time_ms); | |
1663 size_t pending_card_num(); | |
1664 size_t max_pending_card_num(); | |
1665 size_t cards_scanned(); | |
1666 | |
1667 protected: | |
1668 size_t _max_heap_capacity; | |
1669 }; | |
1670 | |
845
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1671 #define use_local_bitmaps 1 |
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1672 #define verify_local_bitmaps 0 |
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1673 #define oop_buffer_length 256 |
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1674 |
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1675 #ifndef PRODUCT |
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1676 class GCLabBitMap; |
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1677 class GCLabBitMapClosure: public BitMapClosure { |
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1678 private: |
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1679 ConcurrentMark* _cm; |
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1680 GCLabBitMap* _bitmap; |
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1681 |
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1682 public: |
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1683 GCLabBitMapClosure(ConcurrentMark* cm, |
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1684 GCLabBitMap* bitmap) { |
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1685 _cm = cm; |
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1686 _bitmap = bitmap; |
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|
1687 } |
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1688 |
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|
1689 virtual bool do_bit(size_t offset); |
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|
1690 }; |
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1691 #endif // !PRODUCT |
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1692 |
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1693 class GCLabBitMap: public BitMap { |
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1694 private: |
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|
1695 ConcurrentMark* _cm; |
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1696 |
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|
1697 int _shifter; |
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1698 size_t _bitmap_word_covers_words; |
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1699 |
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1700 // beginning of the heap |
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1701 HeapWord* _heap_start; |
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1702 |
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1703 // this is the actual start of the GCLab |
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1704 HeapWord* _real_start_word; |
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1705 |
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1706 // this is the actual end of the GCLab |
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1707 HeapWord* _real_end_word; |
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1708 |
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1709 // this is the first word, possibly located before the actual start |
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1710 // of the GCLab, that corresponds to the first bit of the bitmap |
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1711 HeapWord* _start_word; |
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1712 |
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1713 // size of a GCLab in words |
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1714 size_t _gclab_word_size; |
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1715 |
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1716 static int shifter() { |
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1717 return MinObjAlignment - 1; |
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1718 } |
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1719 |
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1720 // how many heap words does a single bitmap word corresponds to? |
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1721 static size_t bitmap_word_covers_words() { |
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1722 return BitsPerWord << shifter(); |
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|
1723 } |
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1724 |
1391
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1725 size_t gclab_word_size() const { |
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1726 return _gclab_word_size; |
845
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|
1727 } |
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1728 |
1391
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1729 // Calculates actual GCLab size in words |
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1730 size_t gclab_real_word_size() const { |
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1731 return bitmap_size_in_bits(pointer_delta(_real_end_word, _start_word)) |
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1732 / BitsPerWord; |
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1733 } |
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1734 |
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1735 static size_t bitmap_size_in_bits(size_t gclab_word_size) { |
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1736 size_t bits_in_bitmap = gclab_word_size >> shifter(); |
845
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1737 // We are going to ensure that the beginning of a word in this |
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1738 // bitmap also corresponds to the beginning of a word in the |
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1739 // global marking bitmap. To handle the case where a GCLab |
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1740 // starts from the middle of the bitmap, we need to add enough |
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|
1741 // space (i.e. up to a bitmap word) to ensure that we have |
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
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parents:
838
diff
changeset
|
1742 // enough bits in the bitmap. |
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
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diff
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|
1743 return bits_in_bitmap + BitsPerWord - 1; |
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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|
1744 } |
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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
|
1745 public: |
1391
79e419e5ea3b
6942253: G1: replace G1ParallelGCAllocBufferSize with YoungPLABSize and OldPLABSize
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|
1746 GCLabBitMap(HeapWord* heap_start, size_t gclab_word_size) |
79e419e5ea3b
6942253: G1: replace G1ParallelGCAllocBufferSize with YoungPLABSize and OldPLABSize
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|
1747 : BitMap(bitmap_size_in_bits(gclab_word_size)), |
845
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
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parents:
838
diff
changeset
|
1748 _cm(G1CollectedHeap::heap()->concurrent_mark()), |
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
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838
diff
changeset
|
1749 _shifter(shifter()), |
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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|
1750 _bitmap_word_covers_words(bitmap_word_covers_words()), |
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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|
1751 _heap_start(heap_start), |
1391
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6942253: G1: replace G1ParallelGCAllocBufferSize with YoungPLABSize and OldPLABSize
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|
1752 _gclab_word_size(gclab_word_size), |
845
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
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diff
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|
1753 _real_start_word(NULL), |
df6caf649ff7
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diff
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|
1754 _real_end_word(NULL), |
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6700789: G1: Enable use of compressed oops with G1 heaps
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diff
changeset
|
1755 _start_word(NULL) |
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diff
changeset
|
1756 { |
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6700789: G1: Enable use of compressed oops with G1 heaps
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diff
changeset
|
1757 guarantee( size_in_words() >= bitmap_size_in_words(), |
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
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parents:
838
diff
changeset
|
1758 "just making sure"); |
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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
|
1759 } |
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parents:
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diff
changeset
|
1760 |
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diff
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|
1761 inline unsigned heapWordToOffset(HeapWord* addr) { |
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6700789: G1: Enable use of compressed oops with G1 heaps
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diff
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|
1762 unsigned offset = (unsigned) pointer_delta(addr, _start_word) >> _shifter; |
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6700789: G1: Enable use of compressed oops with G1 heaps
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diff
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|
1763 assert(offset < size(), "offset should be within bounds"); |
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6700789: G1: Enable use of compressed oops with G1 heaps
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diff
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|
1764 return offset; |
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diff
changeset
|
1765 } |
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diff
changeset
|
1766 |
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diff
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|
1767 inline HeapWord* offsetToHeapWord(size_t offset) { |
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1768 HeapWord* addr = _start_word + (offset << _shifter); |
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|
1769 assert(_real_start_word <= addr && addr < _real_end_word, "invariant"); |
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|
1770 return addr; |
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diff
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|
1771 } |
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diff
changeset
|
1772 |
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diff
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|
1773 bool fields_well_formed() { |
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|
1774 bool ret1 = (_real_start_word == NULL) && |
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|
1775 (_real_end_word == NULL) && |
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|
1776 (_start_word == NULL); |
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|
1777 if (ret1) |
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|
1778 return true; |
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diff
changeset
|
1779 |
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diff
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|
1780 bool ret2 = _real_start_word >= _start_word && |
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|
1781 _start_word < _real_end_word && |
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6700789: G1: Enable use of compressed oops with G1 heaps
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1782 (_real_start_word + _gclab_word_size) == _real_end_word && |
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|
1783 (_start_word + _gclab_word_size + _bitmap_word_covers_words) |
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|
1784 > _real_end_word; |
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|
1785 return ret2; |
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diff
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|
1786 } |
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diff
changeset
|
1787 |
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diff
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|
1788 inline bool mark(HeapWord* addr) { |
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diff
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|
1789 guarantee(use_local_bitmaps, "invariant"); |
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parents:
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diff
changeset
|
1790 assert(fields_well_formed(), "invariant"); |
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|
1791 |
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|
1792 if (addr >= _real_start_word && addr < _real_end_word) { |
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|
1793 assert(!isMarked(addr), "should not have already been marked"); |
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|
1794 |
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|
1795 // first mark it on the bitmap |
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|
1796 at_put(heapWordToOffset(addr), true); |
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|
1797 |
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|
1798 return true; |
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diff
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|
1799 } else { |
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|
1800 return false; |
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diff
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|
1801 } |
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diff
changeset
|
1802 } |
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changeset
|
1803 |
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|
1804 inline bool isMarked(HeapWord* addr) { |
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|
1805 guarantee(use_local_bitmaps, "invariant"); |
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parents:
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diff
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|
1806 assert(fields_well_formed(), "invariant"); |
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diff
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|
1807 |
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|
1808 return at(heapWordToOffset(addr)); |
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diff
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|
1809 } |
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diff
changeset
|
1810 |
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diff
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|
1811 void set_buffer(HeapWord* start) { |
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6700789: G1: Enable use of compressed oops with G1 heaps
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changeset
|
1812 guarantee(use_local_bitmaps, "invariant"); |
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diff
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|
1813 clear(); |
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diff
changeset
|
1814 |
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diff
changeset
|
1815 assert(start != NULL, "invariant"); |
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diff
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|
1816 _real_start_word = start; |
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|
1817 _real_end_word = start + _gclab_word_size; |
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|
1818 |
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|
1819 size_t diff = |
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|
1820 pointer_delta(start, _heap_start) % _bitmap_word_covers_words; |
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|
1821 _start_word = start - diff; |
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changeset
|
1822 |
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|
1823 assert(fields_well_formed(), "invariant"); |
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diff
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|
1824 } |
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diff
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|
1825 |
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diff
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|
1826 #ifndef PRODUCT |
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diff
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|
1827 void verify() { |
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diff
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|
1828 // verify that the marks have been propagated |
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|
1829 GCLabBitMapClosure cl(_cm, this); |
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diff
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|
1830 iterate(&cl); |
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diff
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|
1831 } |
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diff
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|
1832 #endif // PRODUCT |
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diff
changeset
|
1833 |
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diff
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|
1834 void retire() { |
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changeset
|
1835 guarantee(use_local_bitmaps, "invariant"); |
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diff
changeset
|
1836 assert(fields_well_formed(), "invariant"); |
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diff
changeset
|
1837 |
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|
1838 if (_start_word != NULL) { |
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|
1839 CMBitMap* mark_bitmap = _cm->nextMarkBitMap(); |
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|
1840 |
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|
1841 // this means that the bitmap was set up for the GCLab |
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|
1842 assert(_real_start_word != NULL && _real_end_word != NULL, "invariant"); |
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|
1843 |
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diff
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|
1844 mark_bitmap->mostly_disjoint_range_union(this, |
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diff
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|
1845 0, // always start from the start of the bitmap |
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|
1846 _start_word, |
1391
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|
1847 gclab_real_word_size()); |
845
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diff
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|
1848 _cm->grayRegionIfNecessary(MemRegion(_real_start_word, _real_end_word)); |
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|
1849 |
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|
1850 #ifndef PRODUCT |
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|
1851 if (use_local_bitmaps && verify_local_bitmaps) |
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diff
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|
1852 verify(); |
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diff
changeset
|
1853 #endif // PRODUCT |
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|
1854 } else { |
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|
1855 assert(_real_start_word == NULL && _real_end_word == NULL, "invariant"); |
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parents:
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diff
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|
1856 } |
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diff
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|
1857 } |
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diff
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|
1858 |
1391
79e419e5ea3b
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apetrusenko
parents:
1313
diff
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|
1859 size_t bitmap_size_in_words() const { |
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6942253: G1: replace G1ParallelGCAllocBufferSize with YoungPLABSize and OldPLABSize
apetrusenko
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|
1860 return (bitmap_size_in_bits(gclab_word_size()) + BitsPerWord - 1) / BitsPerWord; |
845
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diff
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|
1861 } |
1391
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diff
changeset
|
1862 |
845
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parents:
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diff
changeset
|
1863 }; |
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parents:
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diff
changeset
|
1864 |
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diff
changeset
|
1865 class G1ParGCAllocBuffer: public ParGCAllocBuffer { |
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
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parents:
838
diff
changeset
|
1866 private: |
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parents:
838
diff
changeset
|
1867 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
|
1868 bool _should_mark_objects; |
845
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1869 GCLabBitMap _bitmap; |
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1870 |
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1871 public: |
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1872 G1ParGCAllocBuffer(size_t gclab_word_size); |
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1873 |
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1874 inline bool mark(HeapWord* addr) { |
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1875 guarantee(use_local_bitmaps, "invariant"); |
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1876 assert(_should_mark_objects, "invariant"); |
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1877 return _bitmap.mark(addr); |
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1878 } |
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1879 |
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1880 inline void set_buf(HeapWord* buf) { |
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1881 if (use_local_bitmaps && _should_mark_objects) { |
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1882 _bitmap.set_buffer(buf); |
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1883 } |
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1884 ParGCAllocBuffer::set_buf(buf); |
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1885 _retired = false; |
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1886 } |
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1887 |
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1888 inline void retire(bool end_of_gc, bool retain) { |
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1889 if (_retired) |
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1890 return; |
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1891 if (use_local_bitmaps && _should_mark_objects) { |
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1892 _bitmap.retire(); |
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1893 } |
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1894 ParGCAllocBuffer::retire(end_of_gc, retain); |
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1895 _retired = true; |
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1896 } |
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1897 }; |
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1898 |
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1899 class G1ParScanThreadState : public StackObj { |
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1900 protected: |
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1901 G1CollectedHeap* _g1h; |
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1902 RefToScanQueue* _refs; |
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1903 DirtyCardQueue _dcq; |
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1904 CardTableModRefBS* _ct_bs; |
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1905 G1RemSet* _g1_rem; |
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1906 |
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1907 G1ParGCAllocBuffer _surviving_alloc_buffer; |
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1908 G1ParGCAllocBuffer _tenured_alloc_buffer; |
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1909 G1ParGCAllocBuffer* _alloc_buffers[GCAllocPurposeCount]; |
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1910 ageTable _age_table; |
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1911 |
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1912 size_t _alloc_buffer_waste; |
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1913 size_t _undo_waste; |
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1914 |
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1915 OopsInHeapRegionClosure* _evac_failure_cl; |
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1916 G1ParScanHeapEvacClosure* _evac_cl; |
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1917 G1ParScanPartialArrayClosure* _partial_scan_cl; |
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1918 |
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1919 int _hash_seed; |
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1920 int _queue_num; |
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1921 |
1611 | 1922 size_t _term_attempts; |
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1923 |
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1924 double _start; |
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1925 double _start_strong_roots; |
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1926 double _strong_roots_time; |
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1927 double _start_term; |
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1928 double _term_time; |
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1929 |
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1930 // Map from young-age-index (0 == not young, 1 is youngest) to |
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1931 // surviving words. base is what we get back from the malloc call |
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1932 size_t* _surviving_young_words_base; |
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1933 // this points into the array, as we use the first few entries for padding |
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1934 size_t* _surviving_young_words; |
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1935 |
1709 | 1936 #define PADDING_ELEM_NUM (DEFAULT_CACHE_LINE_SIZE / sizeof(size_t)) |
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1937 |
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1938 void add_to_alloc_buffer_waste(size_t waste) { _alloc_buffer_waste += waste; } |
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1939 |
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1940 void add_to_undo_waste(size_t waste) { _undo_waste += waste; } |
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1941 |
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1942 DirtyCardQueue& dirty_card_queue() { return _dcq; } |
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1943 CardTableModRefBS* ctbs() { return _ct_bs; } |
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1944 |
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1945 template <class T> void immediate_rs_update(HeapRegion* from, T* p, int tid) { |
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1946 if (!from->is_survivor()) { |
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1947 _g1_rem->par_write_ref(from, p, tid); |
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1948 } |
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1949 } |
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1950 |
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1951 template <class T> void deferred_rs_update(HeapRegion* from, T* p, int tid) { |
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1952 // If the new value of the field points to the same region or |
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1953 // is the to-space, we don't need to include it in the Rset updates. |
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1954 if (!from->is_in_reserved(oopDesc::load_decode_heap_oop(p)) && !from->is_survivor()) { |
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1955 size_t card_index = ctbs()->index_for(p); |
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1956 // If the card hasn't been added to the buffer, do it. |
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1957 if (ctbs()->mark_card_deferred(card_index)) { |
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1958 dirty_card_queue().enqueue((jbyte*)ctbs()->byte_for_index(card_index)); |
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1959 } |
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1960 } |
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1961 } |
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1962 |
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1963 public: |
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1964 G1ParScanThreadState(G1CollectedHeap* g1h, int queue_num); |
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1965 |
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1966 ~G1ParScanThreadState() { |
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1967 FREE_C_HEAP_ARRAY(size_t, _surviving_young_words_base); |
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1968 } |
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1969 |
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1970 RefToScanQueue* refs() { return _refs; } |
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1971 ageTable* age_table() { return &_age_table; } |
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1972 |
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1973 G1ParGCAllocBuffer* alloc_buffer(GCAllocPurpose purpose) { |
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1974 return _alloc_buffers[purpose]; |
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1975 } |
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1976 |
1709 | 1977 size_t alloc_buffer_waste() const { return _alloc_buffer_waste; } |
1978 size_t undo_waste() const { return _undo_waste; } | |
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1979 |
1862
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1980 #ifdef ASSERT |
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1981 bool verify_ref(narrowOop* ref) const; |
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1982 bool verify_ref(oop* ref) const; |
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1983 bool verify_task(StarTask ref) const; |
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1984 #endif // ASSERT |
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1985 |
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1986 template <class T> void push_on_queue(T* ref) { |
1862
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1987 assert(verify_ref(ref), "sanity"); |
1709 | 1988 refs()->push(ref); |
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1989 } |
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1990 |
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1991 template <class T> void update_rs(HeapRegion* from, T* p, int tid) { |
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1992 if (G1DeferredRSUpdate) { |
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1993 deferred_rs_update(from, p, tid); |
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1994 } else { |
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1995 immediate_rs_update(from, p, tid); |
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1996 } |
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1997 } |
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1998 |
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1999 HeapWord* allocate_slow(GCAllocPurpose purpose, size_t word_sz) { |
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2000 |
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2001 HeapWord* obj = NULL; |
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2002 size_t gclab_word_size = _g1h->desired_plab_sz(purpose); |
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2003 if (word_sz * 100 < gclab_word_size * ParallelGCBufferWastePct) { |
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2004 G1ParGCAllocBuffer* alloc_buf = alloc_buffer(purpose); |
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2005 assert(gclab_word_size == alloc_buf->word_sz(), |
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2006 "dynamic resizing is not supported"); |
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2007 add_to_alloc_buffer_waste(alloc_buf->words_remaining()); |
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2008 alloc_buf->retire(false, false); |
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2009 |
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2010 HeapWord* buf = _g1h->par_allocate_during_gc(purpose, gclab_word_size); |
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2011 if (buf == NULL) return NULL; // Let caller handle allocation failure. |
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2012 // Otherwise. |
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2013 alloc_buf->set_buf(buf); |
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2014 |
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2015 obj = alloc_buf->allocate(word_sz); |
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2016 assert(obj != NULL, "buffer was definitely big enough..."); |
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2017 } else { |
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2018 obj = _g1h->par_allocate_during_gc(purpose, word_sz); |
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2019 } |
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2020 return obj; |
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2021 } |
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2022 |
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2023 HeapWord* allocate(GCAllocPurpose purpose, size_t word_sz) { |
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2024 HeapWord* obj = alloc_buffer(purpose)->allocate(word_sz); |
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2025 if (obj != NULL) return obj; |
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2026 return allocate_slow(purpose, word_sz); |
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2027 } |
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2028 |
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2029 void undo_allocation(GCAllocPurpose purpose, HeapWord* obj, size_t word_sz) { |
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2030 if (alloc_buffer(purpose)->contains(obj)) { |
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2031 assert(alloc_buffer(purpose)->contains(obj + word_sz - 1), |
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2032 "should contain whole object"); |
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2033 alloc_buffer(purpose)->undo_allocation(obj, word_sz); |
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2034 } else { |
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2035 CollectedHeap::fill_with_object(obj, word_sz); |
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2036 add_to_undo_waste(word_sz); |
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2037 } |
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2038 } |
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2039 |
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2040 void set_evac_failure_closure(OopsInHeapRegionClosure* evac_failure_cl) { |
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2041 _evac_failure_cl = evac_failure_cl; |
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2042 } |
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2043 OopsInHeapRegionClosure* evac_failure_closure() { |
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2044 return _evac_failure_cl; |
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2045 } |
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2046 |
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2047 void set_evac_closure(G1ParScanHeapEvacClosure* evac_cl) { |
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2048 _evac_cl = evac_cl; |
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2049 } |
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2050 |
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2051 void set_partial_scan_closure(G1ParScanPartialArrayClosure* partial_scan_cl) { |
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2052 _partial_scan_cl = partial_scan_cl; |
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2053 } |
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2054 |
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2055 int* hash_seed() { return &_hash_seed; } |
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2056 int queue_num() { return _queue_num; } |
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2057 |
1709 | 2058 size_t term_attempts() const { return _term_attempts; } |
1611 | 2059 void note_term_attempt() { _term_attempts++; } |
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2060 |
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2061 void start_strong_roots() { |
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2062 _start_strong_roots = os::elapsedTime(); |
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2063 } |
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2064 void end_strong_roots() { |
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2065 _strong_roots_time += (os::elapsedTime() - _start_strong_roots); |
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2066 } |
1709 | 2067 double strong_roots_time() const { return _strong_roots_time; } |
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2068 |
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2069 void start_term_time() { |
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2070 note_term_attempt(); |
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2071 _start_term = os::elapsedTime(); |
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2072 } |
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2073 void end_term_time() { |
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2074 _term_time += (os::elapsedTime() - _start_term); |
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2075 } |
1709 | 2076 double term_time() const { return _term_time; } |
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2077 |
1709 | 2078 double elapsed_time() const { |
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2079 return os::elapsedTime() - _start; |
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2080 } |
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2081 |
1709 | 2082 static void |
2083 print_termination_stats_hdr(outputStream* const st = gclog_or_tty); | |
2084 void | |
2085 print_termination_stats(int i, outputStream* const st = gclog_or_tty) const; | |
2086 | |
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2087 size_t* surviving_young_words() { |
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2088 // We add on to hide entry 0 which accumulates surviving words for |
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2089 // age -1 regions (i.e. non-young ones) |
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2090 return _surviving_young_words; |
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2091 } |
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2092 |
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2093 void retire_alloc_buffers() { |
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2094 for (int ap = 0; ap < GCAllocPurposeCount; ++ap) { |
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2095 size_t waste = _alloc_buffers[ap]->words_remaining(); |
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2096 add_to_alloc_buffer_waste(waste); |
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2097 _alloc_buffers[ap]->retire(true, false); |
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2098 } |
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2099 } |
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2100 |
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2101 template <class T> void deal_with_reference(T* ref_to_scan) { |
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2102 if (has_partial_array_mask(ref_to_scan)) { |
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2103 _partial_scan_cl->do_oop_nv(ref_to_scan); |
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2104 } else { |
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2105 // Note: we can use "raw" versions of "region_containing" because |
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2106 // "obj_to_scan" is definitely in the heap, and is not in a |
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2107 // humongous region. |
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2108 HeapRegion* r = _g1h->heap_region_containing_raw(ref_to_scan); |
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2109 _evac_cl->set_region(r); |
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2110 _evac_cl->do_oop_nv(ref_to_scan); |
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2111 } |
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2112 } |
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2113 |
1862
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2114 void deal_with_reference(StarTask ref) { |
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2115 assert(verify_task(ref), "sanity"); |
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2116 if (ref.is_narrow()) { |
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2117 deal_with_reference((narrowOop*)ref); |
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2118 } else { |
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2119 deal_with_reference((oop*)ref); |
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2120 } |
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2121 } |
1862
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2122 |
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2123 public: |
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2124 void trim_queue(); |
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2125 }; |
1972 | 2126 |
2127 #endif // SHARE_VM_GC_IMPLEMENTATION_G1_G1COLLECTEDHEAP_HPP |