Mercurial > hg > graal-compiler
annotate src/share/vm/gc_implementation/g1/g1CollectedHeap.hpp @ 5988:2a0172480595
7127697: G1: remove dead code after recent concurrent mark changes
Summary: Removed lots of dead code after some recent conc mark changes.
Reviewed-by: brutisso, johnc
author | tonyp |
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date | Thu, 05 Apr 2012 13:57:23 -0400 |
parents | 748051fd24ce |
children | b632e80fc9dc |
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. | |
5987 | 202 template <bool do_gen_barrier, G1Barrier barrier, bool do_mark_object> |
203 friend class G1ParCopyClosure; | |
342 | 204 friend class G1IsAliveClosure; |
205 friend class G1EvacuateFollowersClosure; | |
206 friend class G1ParScanThreadState; | |
207 friend class G1ParScanClosureSuper; | |
208 friend class G1ParEvacuateFollowersClosure; | |
209 friend class G1ParTask; | |
210 friend class G1FreeGarbageRegionClosure; | |
211 friend class RefineCardTableEntryClosure; | |
212 friend class G1PrepareCompactClosure; | |
213 friend class RegionSorter; | |
2152 | 214 friend class RegionResetter; |
342 | 215 friend class CountRCClosure; |
216 friend class EvacPopObjClosure; | |
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217 friend class G1ParCleanupCTTask; |
342 | 218 |
219 // Other related classes. | |
220 friend class G1MarkSweep; | |
221 | |
222 private: | |
223 // The one and only G1CollectedHeap, so static functions can find it. | |
224 static G1CollectedHeap* _g1h; | |
225 | |
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226 static size_t _humongous_object_threshold_in_words; |
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227 |
342 | 228 // Storage for the G1 heap (excludes the permanent generation). |
229 VirtualSpace _g1_storage; | |
230 MemRegion _g1_reserved; | |
231 | |
232 // The part of _g1_storage that is currently committed. | |
233 MemRegion _g1_committed; | |
234 | |
2152 | 235 // The master free list. It will satisfy all new region allocations. |
236 MasterFreeRegionList _free_list; | |
237 | |
238 // The secondary free list which contains regions that have been | |
239 // freed up during the cleanup process. This will be appended to the | |
240 // master free list when appropriate. | |
241 SecondaryFreeRegionList _secondary_free_list; | |
242 | |
4072 | 243 // It keeps track of the old regions. |
244 MasterOldRegionSet _old_set; | |
245 | |
2152 | 246 // It keeps track of the humongous regions. |
247 MasterHumongousRegionSet _humongous_set; | |
342 | 248 |
249 // The number of regions we could create by expansion. | |
250 size_t _expansion_regions; | |
251 | |
252 // The block offset table for the G1 heap. | |
253 G1BlockOffsetSharedArray* _bot_shared; | |
254 | |
4072 | 255 // Tears down the region sets / lists so that they are empty and the |
256 // regions on the heap do not belong to a region set / list. The | |
257 // only exception is the humongous set which we leave unaltered. If | |
258 // free_list_only is true, it will only tear down the master free | |
259 // list. It is called before a Full GC (free_list_only == false) or | |
260 // before heap shrinking (free_list_only == true). | |
261 void tear_down_region_sets(bool free_list_only); | |
262 | |
263 // Rebuilds the region sets / lists so that they are repopulated to | |
264 // reflect the contents of the heap. The only exception is the | |
265 // humongous set which was not torn down in the first place. If | |
266 // free_list_only is true, it will only rebuild the master free | |
267 // list. It is called after a Full GC (free_list_only == false) or | |
268 // after heap shrinking (free_list_only == true). | |
269 void rebuild_region_sets(bool free_list_only); | |
342 | 270 |
271 // The sequence of all heap regions in the heap. | |
3766 | 272 HeapRegionSeq _hrs; |
342 | 273 |
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274 // Alloc region used to satisfy mutator allocation requests. |
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275 MutatorAllocRegion _mutator_alloc_region; |
342 | 276 |
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277 // Alloc region used to satisfy allocation requests by the GC for |
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278 // survivor objects. |
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279 SurvivorGCAllocRegion _survivor_gc_alloc_region; |
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280 |
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281 // Alloc region used to satisfy allocation requests by the GC for |
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282 // old objects. |
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283 OldGCAllocRegion _old_gc_alloc_region; |
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284 |
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285 // The last old region we allocated to during the last GC. |
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286 // Typically, it is not full so we should re-use it during the next GC. |
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287 HeapRegion* _retained_old_gc_alloc_region; |
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288 |
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289 // It specifies whether we should attempt to expand the heap after a |
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290 // region allocation failure. If heap expansion fails we set this to |
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291 // false so that we don't re-attempt the heap expansion (it's likely |
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292 // that subsequent expansion attempts will also fail if one fails). |
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293 // Currently, it is only consulted during GC and it's reset at the |
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294 // start of each GC. |
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295 bool _expand_heap_after_alloc_failure; |
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296 |
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297 // It resets the mutator alloc region before new allocations can take place. |
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298 void init_mutator_alloc_region(); |
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299 |
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300 // It releases the mutator alloc region. |
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301 void release_mutator_alloc_region(); |
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302 |
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303 // It initializes the GC alloc regions at the start of a GC. |
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304 void init_gc_alloc_regions(); |
342 | 305 |
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306 // It releases the GC alloc regions at the end of a GC. |
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307 void release_gc_alloc_regions(); |
342 | 308 |
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309 // It does any cleanup that needs to be done on the GC alloc regions |
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310 // before a Full GC. |
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311 void abandon_gc_alloc_regions(); |
342 | 312 |
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313 // Helper for monitoring and management support. |
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314 G1MonitoringSupport* _g1mm; |
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315 |
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316 // Determines PLAB size for a particular allocation purpose. |
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317 static size_t desired_plab_sz(GCAllocPurpose purpose); |
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318 |
342 | 319 // Outside of GC pauses, the number of bytes used in all regions other |
320 // than the current allocation region. | |
321 size_t _summary_bytes_used; | |
322 | |
526 | 323 // This is used for a quick test on whether a reference points into |
324 // the collection set or not. Basically, we have an array, with one | |
325 // byte per region, and that byte denotes whether the corresponding | |
326 // region is in the collection set or not. The entry corresponding | |
327 // the bottom of the heap, i.e., region 0, is pointed to by | |
328 // _in_cset_fast_test_base. The _in_cset_fast_test field has been | |
329 // biased so that it actually points to address 0 of the address | |
330 // space, to make the test as fast as possible (we can simply shift | |
331 // the address to address into it, instead of having to subtract the | |
332 // bottom of the heap from the address before shifting it; basically | |
333 // it works in the same way the card table works). | |
334 bool* _in_cset_fast_test; | |
335 | |
336 // The allocated array used for the fast test on whether a reference | |
337 // points into the collection set or not. This field is also used to | |
338 // free the array. | |
339 bool* _in_cset_fast_test_base; | |
340 | |
341 // The length of the _in_cset_fast_test_base array. | |
342 size_t _in_cset_fast_test_length; | |
343 | |
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344 volatile unsigned _gc_time_stamp; |
342 | 345 |
346 size_t* _surviving_young_words; | |
347 | |
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348 G1HRPrinter _hr_printer; |
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349 |
342 | 350 void setup_surviving_young_words(); |
351 void update_surviving_young_words(size_t* surv_young_words); | |
352 void cleanup_surviving_young_words(); | |
353 | |
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354 // It decides whether an explicit GC should start a concurrent cycle |
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355 // instead of doing a STW GC. Currently, a concurrent cycle is |
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356 // explicitly started if: |
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357 // (a) cause == _gc_locker and +GCLockerInvokesConcurrent, or |
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358 // (b) cause == _java_lang_system_gc and +ExplicitGCInvokesConcurrent. |
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359 // (c) cause == _g1_humongous_allocation |
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360 bool should_do_concurrent_full_gc(GCCause::Cause cause); |
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361 |
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362 // Keeps track of how many "full collections" (i.e., Full GCs or |
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363 // concurrent cycles) we have completed. The number of them we have |
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364 // started is maintained in _total_full_collections in CollectedHeap. |
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365 volatile unsigned int _full_collections_completed; |
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366 |
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367 // This is a non-product method that is helpful for testing. It is |
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368 // called at the end of a GC and artificially expands the heap by |
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369 // allocating a number of dead regions. This way we can induce very |
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370 // frequent marking cycles and stress the cleanup / concurrent |
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371 // cleanup code more (as all the regions that will be allocated by |
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372 // this method will be found dead by the marking cycle). |
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373 void allocate_dummy_regions() PRODUCT_RETURN; |
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374 |
1973 | 375 // These are macros so that, if the assert fires, we get the correct |
376 // line number, file, etc. | |
377 | |
2361 | 378 #define heap_locking_asserts_err_msg(_extra_message_) \ |
2152 | 379 err_msg("%s : Heap_lock locked: %s, at safepoint: %s, is VM thread: %s", \ |
2361 | 380 (_extra_message_), \ |
2152 | 381 BOOL_TO_STR(Heap_lock->owned_by_self()), \ |
382 BOOL_TO_STR(SafepointSynchronize::is_at_safepoint()), \ | |
383 BOOL_TO_STR(Thread::current()->is_VM_thread())) | |
1973 | 384 |
385 #define assert_heap_locked() \ | |
386 do { \ | |
387 assert(Heap_lock->owned_by_self(), \ | |
388 heap_locking_asserts_err_msg("should be holding the Heap_lock")); \ | |
389 } while (0) | |
390 | |
2361 | 391 #define assert_heap_locked_or_at_safepoint(_should_be_vm_thread_) \ |
1973 | 392 do { \ |
393 assert(Heap_lock->owned_by_self() || \ | |
2152 | 394 (SafepointSynchronize::is_at_safepoint() && \ |
2361 | 395 ((_should_be_vm_thread_) == Thread::current()->is_VM_thread())), \ |
1973 | 396 heap_locking_asserts_err_msg("should be holding the Heap_lock or " \ |
397 "should be at a safepoint")); \ | |
398 } while (0) | |
399 | |
400 #define assert_heap_locked_and_not_at_safepoint() \ | |
401 do { \ | |
402 assert(Heap_lock->owned_by_self() && \ | |
403 !SafepointSynchronize::is_at_safepoint(), \ | |
404 heap_locking_asserts_err_msg("should be holding the Heap_lock and " \ | |
405 "should not be at a safepoint")); \ | |
406 } while (0) | |
407 | |
408 #define assert_heap_not_locked() \ | |
409 do { \ | |
410 assert(!Heap_lock->owned_by_self(), \ | |
411 heap_locking_asserts_err_msg("should not be holding the Heap_lock")); \ | |
412 } while (0) | |
413 | |
414 #define assert_heap_not_locked_and_not_at_safepoint() \ | |
415 do { \ | |
416 assert(!Heap_lock->owned_by_self() && \ | |
417 !SafepointSynchronize::is_at_safepoint(), \ | |
418 heap_locking_asserts_err_msg("should not be holding the Heap_lock and " \ | |
419 "should not be at a safepoint")); \ | |
420 } while (0) | |
421 | |
2361 | 422 #define assert_at_safepoint(_should_be_vm_thread_) \ |
1973 | 423 do { \ |
2152 | 424 assert(SafepointSynchronize::is_at_safepoint() && \ |
2361 | 425 ((_should_be_vm_thread_) == Thread::current()->is_VM_thread()), \ |
1973 | 426 heap_locking_asserts_err_msg("should be at a safepoint")); \ |
427 } while (0) | |
428 | |
429 #define assert_not_at_safepoint() \ | |
430 do { \ | |
431 assert(!SafepointSynchronize::is_at_safepoint(), \ | |
432 heap_locking_asserts_err_msg("should not be at a safepoint")); \ | |
433 } while (0) | |
434 | |
342 | 435 protected: |
436 | |
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437 // The young region list. |
342 | 438 YoungList* _young_list; |
439 | |
440 // The current policy object for the collector. | |
441 G1CollectorPolicy* _g1_policy; | |
442 | |
2152 | 443 // This is the second level of trying to allocate a new region. If |
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444 // new_region() didn't find a region on the free_list, this call will |
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445 // check whether there's anything available on the |
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446 // secondary_free_list and/or wait for more regions to appear on |
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447 // that list, if _free_regions_coming is set. |
2361 | 448 HeapRegion* new_region_try_secondary_free_list(); |
342 | 449 |
2361 | 450 // Try to allocate a single non-humongous HeapRegion sufficient for |
451 // an allocation of the given word_size. If do_expand is true, | |
452 // attempt to expand the heap if necessary to satisfy the allocation | |
453 // request. | |
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454 HeapRegion* new_region(size_t word_size, bool do_expand); |
342 | 455 |
2361 | 456 // Attempt to satisfy a humongous allocation request of the given |
457 // size by finding a contiguous set of free regions of num_regions | |
458 // length and remove them from the master free list. Return the | |
3766 | 459 // index of the first region or G1_NULL_HRS_INDEX if the search |
460 // was unsuccessful. | |
461 size_t humongous_obj_allocate_find_first(size_t num_regions, | |
462 size_t word_size); | |
342 | 463 |
2361 | 464 // Initialize a contiguous set of free regions of length num_regions |
465 // and starting at index first so that they appear as a single | |
466 // humongous region. | |
3766 | 467 HeapWord* humongous_obj_allocate_initialize_regions(size_t first, |
2361 | 468 size_t num_regions, |
469 size_t word_size); | |
470 | |
471 // Attempt to allocate a humongous object of the given size. Return | |
472 // NULL if unsuccessful. | |
2152 | 473 HeapWord* humongous_obj_allocate(size_t word_size); |
1973 | 474 |
475 // The following two methods, allocate_new_tlab() and | |
476 // mem_allocate(), are the two main entry points from the runtime | |
477 // into the G1's allocation routines. They have the following | |
478 // assumptions: | |
479 // | |
480 // * They should both be called outside safepoints. | |
481 // | |
482 // * They should both be called without holding the Heap_lock. | |
483 // | |
484 // * All allocation requests for new TLABs should go to | |
485 // allocate_new_tlab(). | |
486 // | |
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487 // * All non-TLAB allocation requests should go to mem_allocate(). |
1973 | 488 // |
489 // * If either call cannot satisfy the allocation request using the | |
490 // current allocating region, they will try to get a new one. If | |
491 // this fails, they will attempt to do an evacuation pause and | |
492 // retry the allocation. | |
493 // | |
494 // * If all allocation attempts fail, even after trying to schedule | |
495 // an evacuation pause, allocate_new_tlab() will return NULL, | |
496 // whereas mem_allocate() will attempt a heap expansion and/or | |
497 // schedule a Full GC. | |
498 // | |
499 // * We do not allow humongous-sized TLABs. So, allocate_new_tlab | |
500 // should never be called with word_size being humongous. All | |
501 // humongous allocation requests should go to mem_allocate() which | |
502 // will satisfy them with a special path. | |
503 | |
504 virtual HeapWord* allocate_new_tlab(size_t word_size); | |
505 | |
506 virtual HeapWord* mem_allocate(size_t word_size, | |
507 bool* gc_overhead_limit_was_exceeded); | |
342 | 508 |
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509 // The following three methods take a gc_count_before_ret |
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510 // parameter which is used to return the GC count if the method |
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511 // returns NULL. Given that we are required to read the GC count |
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512 // while holding the Heap_lock, and these paths will take the |
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513 // Heap_lock at some point, it's easier to get them to read the GC |
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514 // count while holding the Heap_lock before they return NULL instead |
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515 // of the caller (namely: mem_allocate()) having to also take the |
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516 // Heap_lock just to read the GC count. |
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517 |
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518 // First-level mutator allocation attempt: try to allocate out of |
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519 // the mutator alloc region without taking the Heap_lock. This |
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520 // should only be used for non-humongous allocations. |
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521 inline HeapWord* attempt_allocation(size_t word_size, |
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522 unsigned int* gc_count_before_ret); |
342 | 523 |
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524 // Second-level mutator allocation attempt: take the Heap_lock and |
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525 // retry the allocation attempt, potentially scheduling a GC |
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526 // pause. This should only be used for non-humongous allocations. |
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527 HeapWord* attempt_allocation_slow(size_t word_size, |
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528 unsigned int* gc_count_before_ret); |
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529 |
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530 // Takes the Heap_lock and attempts a humongous allocation. It can |
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531 // potentially schedule a GC pause. |
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532 HeapWord* attempt_allocation_humongous(size_t word_size, |
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533 unsigned int* gc_count_before_ret); |
1973 | 534 |
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535 // Allocation attempt that should be called during safepoints (e.g., |
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536 // at the end of a successful GC). expect_null_mutator_alloc_region |
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537 // specifies whether the mutator alloc region is expected to be NULL |
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538 // or not. |
1973 | 539 HeapWord* attempt_allocation_at_safepoint(size_t word_size, |
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540 bool expect_null_mutator_alloc_region); |
1973 | 541 |
542 // It dirties the cards that cover the block so that so that the post | |
543 // write barrier never queues anything when updating objects on this | |
544 // block. It is assumed (and in fact we assert) that the block | |
545 // belongs to a young region. | |
546 inline void dirty_young_block(HeapWord* start, size_t word_size); | |
342 | 547 |
548 // Allocate blocks during garbage collection. Will ensure an | |
549 // allocation region, either by picking one or expanding the | |
550 // heap, and then allocate a block of the given size. The block | |
551 // may not be a humongous - it must fit into a single heap region. | |
552 HeapWord* par_allocate_during_gc(GCAllocPurpose purpose, size_t word_size); | |
553 | |
554 HeapWord* allocate_during_gc_slow(GCAllocPurpose purpose, | |
555 HeapRegion* alloc_region, | |
556 bool par, | |
557 size_t word_size); | |
558 | |
559 // Ensure that no further allocations can happen in "r", bearing in mind | |
560 // that parallel threads might be attempting allocations. | |
561 void par_allocate_remaining_space(HeapRegion* r); | |
562 | |
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563 // Allocation attempt during GC for a survivor object / PLAB. |
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564 inline HeapWord* survivor_attempt_allocation(size_t word_size); |
545 | 565 |
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566 // Allocation attempt during GC for an old object / PLAB. |
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567 inline HeapWord* old_attempt_allocation(size_t word_size); |
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568 |
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569 // These methods are the "callbacks" from the G1AllocRegion class. |
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570 |
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571 // For mutator alloc regions. |
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572 HeapRegion* new_mutator_alloc_region(size_t word_size, bool force); |
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573 void retire_mutator_alloc_region(HeapRegion* alloc_region, |
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574 size_t allocated_bytes); |
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575 |
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576 // For GC alloc regions. |
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577 HeapRegion* new_gc_alloc_region(size_t word_size, size_t count, |
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578 GCAllocPurpose ap); |
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579 void retire_gc_alloc_region(HeapRegion* alloc_region, |
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580 size_t allocated_bytes, GCAllocPurpose ap); |
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581 |
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582 // - if explicit_gc is true, the GC is for a System.gc() or a heap |
1973 | 583 // inspection request and should collect the entire heap |
584 // - if clear_all_soft_refs is true, all soft references should be | |
585 // cleared during the GC | |
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586 // - if explicit_gc is false, word_size describes the allocation that |
1973 | 587 // the GC should attempt (at least) to satisfy |
588 // - it returns false if it is unable to do the collection due to the | |
589 // GC locker being active, true otherwise | |
590 bool do_collection(bool explicit_gc, | |
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591 bool clear_all_soft_refs, |
342 | 592 size_t word_size); |
593 | |
594 // Callback from VM_G1CollectFull operation. | |
595 // Perform a full collection. | |
596 void do_full_collection(bool clear_all_soft_refs); | |
597 | |
598 // Resize the heap if necessary after a full collection. If this is | |
599 // after a collect-for allocation, "word_size" is the allocation size, | |
600 // and will be considered part of the used portion of the heap. | |
601 void resize_if_necessary_after_full_collection(size_t word_size); | |
602 | |
603 // Callback from VM_G1CollectForAllocation operation. | |
604 // This function does everything necessary/possible to satisfy a | |
605 // failed allocation request (including collection, expansion, etc.) | |
1973 | 606 HeapWord* satisfy_failed_allocation(size_t word_size, bool* succeeded); |
342 | 607 |
608 // Attempting to expand the heap sufficiently | |
609 // to support an allocation of the given "word_size". If | |
610 // successful, perform the allocation and return the address of the | |
611 // allocated block, or else "NULL". | |
1973 | 612 HeapWord* expand_and_allocate(size_t word_size); |
342 | 613 |
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614 // Process any reference objects discovered during |
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615 // an incremental evacuation pause. |
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616 void process_discovered_references(); |
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617 |
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618 // Enqueue any remaining discovered references |
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619 // after processing. |
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620 void enqueue_discovered_references(); |
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621 |
342 | 622 public: |
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623 |
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624 G1MonitoringSupport* g1mm() { |
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625 assert(_g1mm != NULL, "should have been initialized"); |
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626 return _g1mm; |
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627 } |
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628 |
342 | 629 // Expand the garbage-first heap by at least the given size (in bytes!). |
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630 // Returns true if the heap was expanded by the requested amount; |
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631 // false otherwise. |
342 | 632 // (Rounds up to a HeapRegion boundary.) |
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633 bool expand(size_t expand_bytes); |
342 | 634 |
635 // Do anything common to GC's. | |
636 virtual void gc_prologue(bool full); | |
637 virtual void gc_epilogue(bool full); | |
638 | |
526 | 639 // We register a region with the fast "in collection set" test. We |
640 // simply set to true the array slot corresponding to this region. | |
641 void register_region_with_in_cset_fast_test(HeapRegion* r) { | |
642 assert(_in_cset_fast_test_base != NULL, "sanity"); | |
643 assert(r->in_collection_set(), "invariant"); | |
3766 | 644 size_t index = r->hrs_index(); |
645 assert(index < _in_cset_fast_test_length, "invariant"); | |
526 | 646 assert(!_in_cset_fast_test_base[index], "invariant"); |
647 _in_cset_fast_test_base[index] = true; | |
648 } | |
649 | |
650 // This is a fast test on whether a reference points into the | |
651 // collection set or not. It does not assume that the reference | |
652 // points into the heap; if it doesn't, it will return false. | |
653 bool in_cset_fast_test(oop obj) { | |
654 assert(_in_cset_fast_test != NULL, "sanity"); | |
655 if (_g1_committed.contains((HeapWord*) obj)) { | |
656 // no need to subtract the bottom of the heap from obj, | |
657 // _in_cset_fast_test is biased | |
658 size_t index = ((size_t) obj) >> HeapRegion::LogOfHRGrainBytes; | |
659 bool ret = _in_cset_fast_test[index]; | |
660 // let's make sure the result is consistent with what the slower | |
661 // test returns | |
662 assert( ret || !obj_in_cs(obj), "sanity"); | |
663 assert(!ret || obj_in_cs(obj), "sanity"); | |
664 return ret; | |
665 } else { | |
666 return false; | |
667 } | |
668 } | |
669 | |
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670 void clear_cset_fast_test() { |
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671 assert(_in_cset_fast_test_base != NULL, "sanity"); |
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672 memset(_in_cset_fast_test_base, false, |
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673 _in_cset_fast_test_length * sizeof(bool)); |
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674 } |
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675 |
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676 // This is called at the end of either a concurrent cycle or a Full |
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677 // GC to update the number of full collections completed. Those two |
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678 // can happen in a nested fashion, i.e., we start a concurrent |
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679 // cycle, a Full GC happens half-way through it which ends first, |
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680 // and then the cycle notices that a Full GC happened and ends |
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681 // too. The concurrent parameter is a boolean to help us do a bit |
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682 // tighter consistency checking in the method. If concurrent is |
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683 // false, the caller is the inner caller in the nesting (i.e., the |
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684 // Full GC). If concurrent is true, the caller is the outer caller |
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685 // in this nesting (i.e., the concurrent cycle). Further nesting is |
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686 // not currently supported. The end of the this call also notifies |
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687 // the FullGCCount_lock in case a Java thread is waiting for a full |
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688 // GC to happen (e.g., it called System.gc() with |
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689 // +ExplicitGCInvokesConcurrent). |
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690 void increment_full_collections_completed(bool concurrent); |
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691 |
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692 unsigned int full_collections_completed() { |
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693 return _full_collections_completed; |
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694 } |
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695 |
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696 G1HRPrinter* hr_printer() { return &_hr_printer; } |
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697 |
342 | 698 protected: |
699 | |
700 // Shrink the garbage-first heap by at most the given size (in bytes!). | |
701 // (Rounds down to a HeapRegion boundary.) | |
702 virtual void shrink(size_t expand_bytes); | |
703 void shrink_helper(size_t expand_bytes); | |
704 | |
1709 | 705 #if TASKQUEUE_STATS |
706 static void print_taskqueue_stats_hdr(outputStream* const st = gclog_or_tty); | |
707 void print_taskqueue_stats(outputStream* const st = gclog_or_tty) const; | |
708 void reset_taskqueue_stats(); | |
709 #endif // TASKQUEUE_STATS | |
710 | |
1973 | 711 // Schedule the VM operation that will do an evacuation pause to |
712 // satisfy an allocation request of word_size. *succeeded will | |
713 // return whether the VM operation was successful (it did do an | |
714 // evacuation pause) or not (another thread beat us to it or the GC | |
715 // locker was active). Given that we should not be holding the | |
716 // Heap_lock when we enter this method, we will pass the | |
717 // gc_count_before (i.e., total_collections()) as a parameter since | |
718 // it has to be read while holding the Heap_lock. Currently, both | |
719 // methods that call do_collection_pause() release the Heap_lock | |
720 // before the call, so it's easy to read gc_count_before just before. | |
721 HeapWord* do_collection_pause(size_t word_size, | |
722 unsigned int gc_count_before, | |
723 bool* succeeded); | |
342 | 724 |
725 // The guts of the incremental collection pause, executed by the vm | |
1973 | 726 // thread. It returns false if it is unable to do the collection due |
727 // to the GC locker being active, true otherwise | |
728 bool do_collection_pause_at_safepoint(double target_pause_time_ms); | |
342 | 729 |
730 // Actually do the work of evacuating the collection set. | |
1973 | 731 void evacuate_collection_set(); |
342 | 732 |
733 // The g1 remembered set of the heap. | |
734 G1RemSet* _g1_rem_set; | |
735 // And it's mod ref barrier set, used to track updates for the above. | |
736 ModRefBarrierSet* _mr_bs; | |
737 | |
616
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738 // A set of cards that cover the objects for which the Rsets should be updated |
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739 // concurrently after the collection. |
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740 DirtyCardQueueSet _dirty_card_queue_set; |
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741 |
342 | 742 // The Heap Region Rem Set Iterator. |
743 HeapRegionRemSetIterator** _rem_set_iterator; | |
744 | |
745 // The closure used to refine a single card. | |
746 RefineCardTableEntryClosure* _refine_cte_cl; | |
747 | |
748 // A function to check the consistency of dirty card logs. | |
749 void check_ct_logs_at_safepoint(); | |
750 | |
1705 | 751 // A DirtyCardQueueSet that is used to hold cards that contain |
752 // references into the current collection set. This is used to | |
753 // update the remembered sets of the regions in the collection | |
754 // set in the event of an evacuation failure. | |
755 DirtyCardQueueSet _into_cset_dirty_card_queue_set; | |
756 | |
342 | 757 // After a collection pause, make the regions in the CS into free |
758 // regions. | |
759 void free_collection_set(HeapRegion* cs_head); | |
760 | |
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761 // Abandon the current collection set without recording policy |
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762 // statistics or updating free lists. |
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763 void abandon_collection_set(HeapRegion* cs_head); |
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764 |
342 | 765 // Applies "scan_non_heap_roots" to roots outside the heap, |
766 // "scan_rs" to roots inside the heap (having done "set_region" to | |
767 // indicate the region in which the root resides), and does "scan_perm" | |
768 // (setting the generation to the perm generation.) If "scan_rs" is | |
769 // NULL, then this step is skipped. The "worker_i" | |
770 // param is for use with parallel roots processing, and should be | |
771 // the "i" of the calling parallel worker thread's work(i) function. | |
772 // In the sequential case this param will be ignored. | |
773 void g1_process_strong_roots(bool collecting_perm_gen, | |
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774 ScanningOption so, |
342 | 775 OopClosure* scan_non_heap_roots, |
776 OopsInHeapRegionClosure* scan_rs, | |
777 OopsInGenClosure* scan_perm, | |
778 int worker_i); | |
779 | |
780 // Apply "blk" to all the weak roots of the system. These include | |
781 // JNI weak roots, the code cache, system dictionary, symbol table, | |
782 // string table, and referents of reachable weak refs. | |
783 void g1_process_weak_roots(OopClosure* root_closure, | |
784 OopClosure* non_root_closure); | |
785 | |
2361 | 786 // Frees a non-humongous region by initializing its contents and |
2152 | 787 // adding it to the free list that's passed as a parameter (this is |
788 // usually a local list which will be appended to the master free | |
789 // list later). The used bytes of freed regions are accumulated in | |
790 // pre_used. If par is true, the region's RSet will not be freed | |
791 // up. The assumption is that this will be done later. | |
792 void free_region(HeapRegion* hr, | |
793 size_t* pre_used, | |
794 FreeRegionList* free_list, | |
795 bool par); | |
342 | 796 |
2361 | 797 // Frees a humongous region by collapsing it into individual regions |
798 // and calling free_region() for each of them. The freed regions | |
799 // will be added to the free list that's passed as a parameter (this | |
800 // is usually a local list which will be appended to the master free | |
801 // list later). The used bytes of freed regions are accumulated in | |
802 // pre_used. If par is true, the region's RSet will not be freed | |
803 // up. The assumption is that this will be done later. | |
2152 | 804 void free_humongous_region(HeapRegion* hr, |
805 size_t* pre_used, | |
806 FreeRegionList* free_list, | |
807 HumongousRegionSet* humongous_proxy_set, | |
808 bool par); | |
342 | 809 |
3766 | 810 // Notifies all the necessary spaces that the committed space has |
811 // been updated (either expanded or shrunk). It should be called | |
812 // after _g1_storage is updated. | |
813 void update_committed_space(HeapWord* old_end, HeapWord* new_end); | |
814 | |
342 | 815 // The concurrent marker (and the thread it runs in.) |
816 ConcurrentMark* _cm; | |
817 ConcurrentMarkThread* _cmThread; | |
818 bool _mark_in_progress; | |
819 | |
820 // The concurrent refiner. | |
821 ConcurrentG1Refine* _cg1r; | |
822 | |
823 // The parallel task queues | |
824 RefToScanQueueSet *_task_queues; | |
825 | |
826 // True iff a evacuation has failed in the current collection. | |
827 bool _evacuation_failed; | |
828 | |
829 // Set the attribute indicating whether evacuation has failed in the | |
830 // current collection. | |
831 void set_evacuation_failed(bool b) { _evacuation_failed = b; } | |
832 | |
833 // Failed evacuations cause some logical from-space objects to have | |
834 // forwarding pointers to themselves. Reset them. | |
835 void remove_self_forwarding_pointers(); | |
836 | |
837 // When one is non-null, so is the other. Together, they each pair is | |
838 // an object with a preserved mark, and its mark value. | |
839 GrowableArray<oop>* _objs_with_preserved_marks; | |
840 GrowableArray<markOop>* _preserved_marks_of_objs; | |
841 | |
842 // Preserve the mark of "obj", if necessary, in preparation for its mark | |
843 // word being overwritten with a self-forwarding-pointer. | |
844 void preserve_mark_if_necessary(oop obj, markOop m); | |
845 | |
846 // The stack of evac-failure objects left to be scanned. | |
847 GrowableArray<oop>* _evac_failure_scan_stack; | |
848 // The closure to apply to evac-failure objects. | |
849 | |
850 OopsInHeapRegionClosure* _evac_failure_closure; | |
851 // Set the field above. | |
852 void | |
853 set_evac_failure_closure(OopsInHeapRegionClosure* evac_failure_closure) { | |
854 _evac_failure_closure = evac_failure_closure; | |
855 } | |
856 | |
857 // Push "obj" on the scan stack. | |
858 void push_on_evac_failure_scan_stack(oop obj); | |
859 // Process scan stack entries until the stack is empty. | |
860 void drain_evac_failure_scan_stack(); | |
861 // True iff an invocation of "drain_scan_stack" is in progress; to | |
862 // prevent unnecessary recursion. | |
863 bool _drain_in_progress; | |
864 | |
865 // Do any necessary initialization for evacuation-failure handling. | |
866 // "cl" is the closure that will be used to process evac-failure | |
867 // objects. | |
868 void init_for_evac_failure(OopsInHeapRegionClosure* cl); | |
869 // Do any necessary cleanup for evacuation-failure handling data | |
870 // structures. | |
871 void finalize_for_evac_failure(); | |
872 | |
873 // An attempt to evacuate "obj" has failed; take necessary steps. | |
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874 oop handle_evacuation_failure_par(OopsInHeapRegionClosure* cl, oop obj); |
342 | 875 void handle_evacuation_failure_common(oop obj, markOop m); |
876 | |
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877 // ("Weak") Reference processing support. |
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878 // |
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879 // G1 has 2 instances of the referece processor class. One |
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880 // (_ref_processor_cm) handles reference object discovery |
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881 // and subsequent processing during concurrent marking cycles. |
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882 // |
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883 // The other (_ref_processor_stw) handles reference object |
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884 // discovery and processing during full GCs and incremental |
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885 // evacuation pauses. |
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886 // |
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887 // During an incremental pause, reference discovery will be |
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888 // temporarily disabled for _ref_processor_cm and will be |
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889 // enabled for _ref_processor_stw. At the end of the evacuation |
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890 // pause references discovered by _ref_processor_stw will be |
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891 // processed and discovery will be disabled. The previous |
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892 // setting for reference object discovery for _ref_processor_cm |
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893 // will be re-instated. |
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894 // |
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895 // At the start of marking: |
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896 // * Discovery by the CM ref processor is verified to be inactive |
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897 // and it's discovered lists are empty. |
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898 // * Discovery by the CM ref processor is then enabled. |
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899 // |
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900 // At the end of marking: |
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901 // * Any references on the CM ref processor's discovered |
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902 // lists are processed (possibly MT). |
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903 // |
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904 // At the start of full GC we: |
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905 // * Disable discovery by the CM ref processor and |
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906 // empty CM ref processor's discovered lists |
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907 // (without processing any entries). |
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908 // * Verify that the STW ref processor is inactive and it's |
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909 // discovered lists are empty. |
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910 // * Temporarily set STW ref processor discovery as single threaded. |
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911 // * Temporarily clear the STW ref processor's _is_alive_non_header |
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912 // field. |
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913 // * Finally enable discovery by the STW ref processor. |
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914 // |
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915 // The STW ref processor is used to record any discovered |
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916 // references during the full GC. |
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917 // |
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918 // At the end of a full GC we: |
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919 // * Enqueue any reference objects discovered by the STW ref processor |
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920 // that have non-live referents. This has the side-effect of |
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921 // making the STW ref processor inactive by disabling discovery. |
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922 // * Verify that the CM ref processor is still inactive |
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923 // and no references have been placed on it's discovered |
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924 // lists (also checked as a precondition during initial marking). |
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925 |
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926 // The (stw) reference processor... |
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927 ReferenceProcessor* _ref_processor_stw; |
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928 |
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929 // During reference object discovery, the _is_alive_non_header |
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930 // closure (if non-null) is applied to the referent object to |
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931 // determine whether the referent is live. If so then the |
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932 // reference object does not need to be 'discovered' and can |
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933 // be treated as a regular oop. This has the benefit of reducing |
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934 // the number of 'discovered' reference objects that need to |
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935 // be processed. |
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936 // |
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937 // Instance of the is_alive closure for embedding into the |
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938 // STW reference processor as the _is_alive_non_header field. |
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939 // Supplying a value for the _is_alive_non_header field is |
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940 // optional but doing so prevents unnecessary additions to |
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941 // the discovered lists during reference discovery. |
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942 G1STWIsAliveClosure _is_alive_closure_stw; |
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943 |
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944 // The (concurrent marking) reference processor... |
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945 ReferenceProcessor* _ref_processor_cm; |
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946 |
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947 // Instance of the concurrent mark is_alive closure for embedding |
3979
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948 // into the Concurrent Marking reference processor as the |
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949 // _is_alive_non_header field. Supplying a value for the |
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950 // _is_alive_non_header field is optional but doing so prevents |
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951 // unnecessary additions to the discovered lists during reference |
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952 // discovery. |
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953 G1CMIsAliveClosure _is_alive_closure_cm; |
342 | 954 |
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955 // Cache used by G1CollectedHeap::start_cset_region_for_worker(). |
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956 HeapRegion** _worker_cset_start_region; |
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957 |
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958 // Time stamp to validate the regions recorded in the cache |
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959 // used by G1CollectedHeap::start_cset_region_for_worker(). |
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960 // The heap region entry for a given worker is valid iff |
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961 // the associated time stamp value matches the current value |
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962 // of G1CollectedHeap::_gc_time_stamp. |
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963 unsigned int* _worker_cset_start_region_time_stamp; |
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964 |
342 | 965 enum G1H_process_strong_roots_tasks { |
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966 G1H_PS_filter_satb_buffers, |
342 | 967 G1H_PS_refProcessor_oops_do, |
968 // Leave this one last. | |
969 G1H_PS_NumElements | |
970 }; | |
971 | |
972 SubTasksDone* _process_strong_tasks; | |
973 | |
2152 | 974 volatile bool _free_regions_coming; |
342 | 975 |
976 public: | |
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977 |
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978 SubTasksDone* process_strong_tasks() { return _process_strong_tasks; } |
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979 |
342 | 980 void set_refine_cte_cl_concurrency(bool concurrent); |
981 | |
1709 | 982 RefToScanQueue *task_queue(int i) const; |
342 | 983 |
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984 // A set of cards where updates happened during the GC |
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985 DirtyCardQueueSet& dirty_card_queue_set() { return _dirty_card_queue_set; } |
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986 |
1705 | 987 // A DirtyCardQueueSet that is used to hold cards that contain |
988 // references into the current collection set. This is used to | |
989 // update the remembered sets of the regions in the collection | |
990 // set in the event of an evacuation failure. | |
991 DirtyCardQueueSet& into_cset_dirty_card_queue_set() | |
992 { return _into_cset_dirty_card_queue_set; } | |
993 | |
342 | 994 // Create a G1CollectedHeap with the specified policy. |
995 // Must call the initialize method afterwards. | |
996 // May not return if something goes wrong. | |
997 G1CollectedHeap(G1CollectorPolicy* policy); | |
998 | |
999 // Initialize the G1CollectedHeap to have the initial and | |
1000 // maximum sizes, permanent generation, and remembered and barrier sets | |
1001 // specified by the policy object. | |
1002 jint initialize(); | |
1003 | |
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1004 // Initialize weak reference processing. |
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1005 virtual void ref_processing_init(); |
342 | 1006 |
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1007 void set_par_threads(uint t) { |
342 | 1008 SharedHeap::set_par_threads(t); |
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1009 // Done in SharedHeap but oddly there are |
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1010 // two _process_strong_tasks's in a G1CollectedHeap |
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1011 // so do it here too. |
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1012 _process_strong_tasks->set_n_threads(t); |
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1013 } |
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1014 |
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1015 // Set _n_par_threads according to a policy TBD. |
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1016 void set_par_threads(); |
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1017 |
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1018 void set_n_termination(int t) { |
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1019 _process_strong_tasks->set_n_threads(t); |
342 | 1020 } |
1021 | |
1022 virtual CollectedHeap::Name kind() const { | |
1023 return CollectedHeap::G1CollectedHeap; | |
1024 } | |
1025 | |
1026 // The current policy object for the collector. | |
1027 G1CollectorPolicy* g1_policy() const { return _g1_policy; } | |
1028 | |
1029 // Adaptive size policy. No such thing for g1. | |
1030 virtual AdaptiveSizePolicy* size_policy() { return NULL; } | |
1031 | |
1032 // The rem set and barrier set. | |
1033 G1RemSet* g1_rem_set() const { return _g1_rem_set; } | |
1034 ModRefBarrierSet* mr_bs() const { return _mr_bs; } | |
1035 | |
1036 // The rem set iterator. | |
1037 HeapRegionRemSetIterator* rem_set_iterator(int i) { | |
1038 return _rem_set_iterator[i]; | |
1039 } | |
1040 | |
1041 HeapRegionRemSetIterator* rem_set_iterator() { | |
1042 return _rem_set_iterator[0]; | |
1043 } | |
1044 | |
1045 unsigned get_gc_time_stamp() { | |
1046 return _gc_time_stamp; | |
1047 } | |
1048 | |
1049 void reset_gc_time_stamp() { | |
1050 _gc_time_stamp = 0; | |
353
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1051 OrderAccess::fence(); |
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1052 // Clear the cached CSet starting regions and time stamps. |
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1053 // Their validity is dependent on the GC timestamp. |
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1054 clear_cset_start_regions(); |
353
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1055 } |
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1056 |
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1057 void increment_gc_time_stamp() { |
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1058 ++_gc_time_stamp; |
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1059 OrderAccess::fence(); |
342 | 1060 } |
1061 | |
1705 | 1062 void iterate_dirty_card_closure(CardTableEntryClosure* cl, |
1063 DirtyCardQueue* into_cset_dcq, | |
1064 bool concurrent, int worker_i); | |
342 | 1065 |
1066 // The shared block offset table array. | |
1067 G1BlockOffsetSharedArray* bot_shared() const { return _bot_shared; } | |
1068 | |
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1069 // Reference Processing accessors |
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1070 |
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1071 // The STW reference processor.... |
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1072 ReferenceProcessor* ref_processor_stw() const { return _ref_processor_stw; } |
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1073 |
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1074 // The Concurent Marking reference processor... |
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1075 ReferenceProcessor* ref_processor_cm() const { return _ref_processor_cm; } |
342 | 1076 |
1077 virtual size_t capacity() const; | |
1078 virtual size_t used() const; | |
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1079 // This should be called when we're not holding the heap lock. The |
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1080 // result might be a bit inaccurate. |
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1081 size_t used_unlocked() const; |
342 | 1082 size_t recalculate_used() const; |
1083 | |
1084 // These virtual functions do the actual allocation. | |
1085 // Some heaps may offer a contiguous region for shared non-blocking | |
1086 // allocation, via inlined code (by exporting the address of the top and | |
1087 // end fields defining the extent of the contiguous allocation region.) | |
1088 // But G1CollectedHeap doesn't yet support this. | |
1089 | |
1090 // Return an estimate of the maximum allocation that could be performed | |
1091 // without triggering any collection or expansion activity. In a | |
1092 // generational collector, for example, this is probably the largest | |
1093 // allocation that could be supported (without expansion) in the youngest | |
1094 // generation. It is "unsafe" because no locks are taken; the result | |
1095 // should be treated as an approximation, not a guarantee, for use in | |
1096 // heuristic resizing decisions. | |
1097 virtual size_t unsafe_max_alloc(); | |
1098 | |
1099 virtual bool is_maximal_no_gc() const { | |
1100 return _g1_storage.uncommitted_size() == 0; | |
1101 } | |
1102 | |
1103 // The total number of regions in the heap. | |
3766 | 1104 size_t n_regions() { return _hrs.length(); } |
1105 | |
1106 // The max number of regions in the heap. | |
1107 size_t max_regions() { return _hrs.max_length(); } | |
342 | 1108 |
1109 // The number of regions that are completely free. | |
3766 | 1110 size_t free_regions() { return _free_list.length(); } |
342 | 1111 |
1112 // The number of regions that are not completely free. | |
1113 size_t used_regions() { return n_regions() - free_regions(); } | |
1114 | |
1115 // The number of regions available for "regular" expansion. | |
1116 size_t expansion_regions() { return _expansion_regions; } | |
1117 | |
3766 | 1118 // Factory method for HeapRegion instances. It will return NULL if |
1119 // the allocation fails. | |
1120 HeapRegion* new_heap_region(size_t hrs_index, HeapWord* bottom); | |
1121 | |
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1122 void verify_not_dirty_region(HeapRegion* hr) PRODUCT_RETURN; |
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1123 void verify_dirty_region(HeapRegion* hr) PRODUCT_RETURN; |
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1124 void verify_dirty_young_list(HeapRegion* head) PRODUCT_RETURN; |
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1125 void verify_dirty_young_regions() PRODUCT_RETURN; |
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1126 |
2152 | 1127 // verify_region_sets() performs verification over the region |
1128 // lists. It will be compiled in the product code to be used when | |
1129 // necessary (i.e., during heap verification). | |
1130 void verify_region_sets(); | |
342 | 1131 |
2152 | 1132 // verify_region_sets_optional() is planted in the code for |
1133 // list verification in non-product builds (and it can be enabled in | |
1134 // product builds by definning HEAP_REGION_SET_FORCE_VERIFY to be 1). | |
1135 #if HEAP_REGION_SET_FORCE_VERIFY | |
1136 void verify_region_sets_optional() { | |
1137 verify_region_sets(); | |
1138 } | |
1139 #else // HEAP_REGION_SET_FORCE_VERIFY | |
1140 void verify_region_sets_optional() { } | |
1141 #endif // HEAP_REGION_SET_FORCE_VERIFY | |
342 | 1142 |
2152 | 1143 #ifdef ASSERT |
2361 | 1144 bool is_on_master_free_list(HeapRegion* hr) { |
2152 | 1145 return hr->containing_set() == &_free_list; |
1146 } | |
342 | 1147 |
2361 | 1148 bool is_in_humongous_set(HeapRegion* hr) { |
2152 | 1149 return hr->containing_set() == &_humongous_set; |
2361 | 1150 } |
2152 | 1151 #endif // ASSERT |
342 | 1152 |
2152 | 1153 // Wrapper for the region list operations that can be called from |
1154 // methods outside this class. | |
342 | 1155 |
2152 | 1156 void secondary_free_list_add_as_tail(FreeRegionList* list) { |
1157 _secondary_free_list.add_as_tail(list); | |
1158 } | |
342 | 1159 |
2152 | 1160 void append_secondary_free_list() { |
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1161 _free_list.add_as_head(&_secondary_free_list); |
2152 | 1162 } |
342 | 1163 |
2361 | 1164 void append_secondary_free_list_if_not_empty_with_lock() { |
1165 // If the secondary free list looks empty there's no reason to | |
1166 // take the lock and then try to append it. | |
2152 | 1167 if (!_secondary_free_list.is_empty()) { |
1168 MutexLockerEx x(SecondaryFreeList_lock, Mutex::_no_safepoint_check_flag); | |
1169 append_secondary_free_list(); | |
1170 } | |
1171 } | |
342 | 1172 |
4072 | 1173 void old_set_remove(HeapRegion* hr) { |
1174 _old_set.remove(hr); | |
1175 } | |
1176 | |
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1177 size_t non_young_capacity_bytes() { |
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1178 return _old_set.total_capacity_bytes() + _humongous_set.total_capacity_bytes(); |
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1179 } |
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1180 |
2152 | 1181 void set_free_regions_coming(); |
1182 void reset_free_regions_coming(); | |
1183 bool free_regions_coming() { return _free_regions_coming; } | |
1184 void wait_while_free_regions_coming(); | |
342 | 1185 |
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1186 // Determine whether the given region is one that we are using as an |
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1187 // old GC alloc region. |
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1188 bool is_old_gc_alloc_region(HeapRegion* hr) { |
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1189 return hr == _retained_old_gc_alloc_region; |
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1190 } |
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1191 |
342 | 1192 // Perform a collection of the heap; intended for use in implementing |
1193 // "System.gc". This probably implies as full a collection as the | |
1194 // "CollectedHeap" supports. | |
1195 virtual void collect(GCCause::Cause cause); | |
1196 | |
1197 // The same as above but assume that the caller holds the Heap_lock. | |
1198 void collect_locked(GCCause::Cause cause); | |
1199 | |
1200 // This interface assumes that it's being called by the | |
1201 // vm thread. It collects the heap assuming that the | |
1202 // heap lock is already held and that we are executing in | |
1203 // the context of the vm thread. | |
1204 virtual void collect_as_vm_thread(GCCause::Cause cause); | |
1205 | |
1206 // True iff a evacuation has failed in the most-recent collection. | |
1207 bool evacuation_failed() { return _evacuation_failed; } | |
1208 | |
2152 | 1209 // It will free a region if it has allocated objects in it that are |
1210 // all dead. It calls either free_region() or | |
1211 // free_humongous_region() depending on the type of the region that | |
1212 // is passed to it. | |
2173 | 1213 void free_region_if_empty(HeapRegion* hr, |
1214 size_t* pre_used, | |
1215 FreeRegionList* free_list, | |
4072 | 1216 OldRegionSet* old_proxy_set, |
2173 | 1217 HumongousRegionSet* humongous_proxy_set, |
1218 HRRSCleanupTask* hrrs_cleanup_task, | |
1219 bool par); | |
342 | 1220 |
2152 | 1221 // It appends the free list to the master free list and updates the |
1222 // master humongous list according to the contents of the proxy | |
1223 // list. It also adjusts the total used bytes according to pre_used | |
1224 // (if par is true, it will do so by taking the ParGCRareEvent_lock). | |
1225 void update_sets_after_freeing_regions(size_t pre_used, | |
1226 FreeRegionList* free_list, | |
4072 | 1227 OldRegionSet* old_proxy_set, |
2152 | 1228 HumongousRegionSet* humongous_proxy_set, |
1229 bool par); | |
342 | 1230 |
4708 | 1231 // Returns "TRUE" iff "p" points into the committed areas of the heap. |
342 | 1232 virtual bool is_in(const void* p) const; |
1233 | |
1234 // Return "TRUE" iff the given object address is within the collection | |
1235 // set. | |
1236 inline bool obj_in_cs(oop obj); | |
1237 | |
1238 // Return "TRUE" iff the given object address is in the reserved | |
1239 // region of g1 (excluding the permanent generation). | |
1240 bool is_in_g1_reserved(const void* p) const { | |
1241 return _g1_reserved.contains(p); | |
1242 } | |
1243 | |
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1244 // Returns a MemRegion that corresponds to the space that has been |
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1245 // reserved for the heap |
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1246 MemRegion g1_reserved() { |
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1247 return _g1_reserved; |
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1248 } |
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1249 |
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1250 // Returns a MemRegion that corresponds to the space that has been |
342 | 1251 // committed in the heap |
1252 MemRegion g1_committed() { | |
1253 return _g1_committed; | |
1254 } | |
1255 | |
2311 | 1256 virtual bool is_in_closed_subset(const void* p) const; |
342 | 1257 |
1258 // This resets the card table to all zeros. It is used after | |
1259 // a collection pause which used the card table to claim cards. | |
1260 void cleanUpCardTable(); | |
1261 | |
1262 // Iteration functions. | |
1263 | |
1264 // Iterate over all the ref-containing fields of all objects, calling | |
1265 // "cl.do_oop" on each. | |
678 | 1266 virtual void oop_iterate(OopClosure* cl) { |
1267 oop_iterate(cl, true); | |
1268 } | |
1269 void oop_iterate(OopClosure* cl, bool do_perm); | |
342 | 1270 |
1271 // Same as above, restricted to a memory region. | |
678 | 1272 virtual void oop_iterate(MemRegion mr, OopClosure* cl) { |
1273 oop_iterate(mr, cl, true); | |
1274 } | |
1275 void oop_iterate(MemRegion mr, OopClosure* cl, bool do_perm); | |
342 | 1276 |
1277 // Iterate over all objects, calling "cl.do_object" on each. | |
678 | 1278 virtual void object_iterate(ObjectClosure* cl) { |
1279 object_iterate(cl, true); | |
1280 } | |
1281 virtual void safe_object_iterate(ObjectClosure* cl) { | |
1282 object_iterate(cl, true); | |
1283 } | |
1284 void object_iterate(ObjectClosure* cl, bool do_perm); | |
342 | 1285 |
1286 // Iterate over all objects allocated since the last collection, calling | |
1287 // "cl.do_object" on each. The heap must have been initialized properly | |
1288 // to support this function, or else this call will fail. | |
1289 virtual void object_iterate_since_last_GC(ObjectClosure* cl); | |
1290 | |
1291 // Iterate over all spaces in use in the heap, in ascending address order. | |
1292 virtual void space_iterate(SpaceClosure* cl); | |
1293 | |
1294 // Iterate over heap regions, in address order, terminating the | |
1295 // iteration early if the "doHeapRegion" method returns "true". | |
3766 | 1296 void heap_region_iterate(HeapRegionClosure* blk) const; |
342 | 1297 |
1298 // Iterate over heap regions starting with r (or the first region if "r" | |
1299 // is NULL), in address order, terminating early if the "doHeapRegion" | |
1300 // method returns "true". | |
3766 | 1301 void heap_region_iterate_from(HeapRegion* r, HeapRegionClosure* blk) const; |
342 | 1302 |
3766 | 1303 // Return the region with the given index. It assumes the index is valid. |
1304 HeapRegion* region_at(size_t index) const { return _hrs.at(index); } | |
342 | 1305 |
1306 // Divide the heap region sequence into "chunks" of some size (the number | |
1307 // of regions divided by the number of parallel threads times some | |
1308 // overpartition factor, currently 4). Assumes that this will be called | |
1309 // in parallel by ParallelGCThreads worker threads with discinct worker | |
1310 // ids in the range [0..max(ParallelGCThreads-1, 1)], that all parallel | |
1311 // calls will use the same "claim_value", and that that claim value is | |
1312 // different from the claim_value of any heap region before the start of | |
1313 // the iteration. Applies "blk->doHeapRegion" to each of the regions, by | |
1314 // attempting to claim the first region in each chunk, and, if | |
1315 // successful, applying the closure to each region in the chunk (and | |
1316 // setting the claim value of the second and subsequent regions of the | |
1317 // chunk.) For now requires that "doHeapRegion" always returns "false", | |
1318 // i.e., that a closure never attempt to abort a traversal. | |
1319 void heap_region_par_iterate_chunked(HeapRegionClosure* blk, | |
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1320 uint worker, |
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1321 uint no_of_par_workers, |
342 | 1322 jint claim_value); |
1323 | |
390 | 1324 // It resets all the region claim values to the default. |
1325 void reset_heap_region_claim_values(); | |
1326 | |
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1327 // Resets the claim values of regions in the current |
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1328 // collection set to the default. |
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1329 void reset_cset_heap_region_claim_values(); |
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1330 |
355 | 1331 #ifdef ASSERT |
1332 bool check_heap_region_claim_values(jint claim_value); | |
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1333 |
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1334 // Same as the routine above but only checks regions in the |
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1335 // current collection set. |
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1336 bool check_cset_heap_region_claim_values(jint claim_value); |
355 | 1337 #endif // ASSERT |
1338 | |
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1339 // Clear the cached cset start regions and (more importantly) |
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1340 // the time stamps. Called when we reset the GC time stamp. |
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1341 void clear_cset_start_regions(); |
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1342 |
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1343 // Given the id of a worker, obtain or calculate a suitable |
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1344 // starting region for iterating over the current collection set. |
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1345 HeapRegion* start_cset_region_for_worker(int worker_i); |
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1346 |
342 | 1347 // Iterate over the regions (if any) in the current collection set. |
1348 void collection_set_iterate(HeapRegionClosure* blk); | |
1349 | |
1350 // As above but starting from region r | |
1351 void collection_set_iterate_from(HeapRegion* r, HeapRegionClosure *blk); | |
1352 | |
1353 // Returns the first (lowest address) compactible space in the heap. | |
1354 virtual CompactibleSpace* first_compactible_space(); | |
1355 | |
1356 // A CollectedHeap will contain some number of spaces. This finds the | |
1357 // space containing a given address, or else returns NULL. | |
1358 virtual Space* space_containing(const void* addr) const; | |
1359 | |
1360 // A G1CollectedHeap will contain some number of heap regions. This | |
1361 // finds the region containing a given address, or else returns NULL. | |
3766 | 1362 template <class T> |
1363 inline HeapRegion* heap_region_containing(const T addr) const; | |
342 | 1364 |
1365 // Like the above, but requires "addr" to be in the heap (to avoid a | |
1366 // null-check), and unlike the above, may return an continuing humongous | |
1367 // region. | |
3766 | 1368 template <class T> |
1369 inline HeapRegion* heap_region_containing_raw(const T addr) const; | |
342 | 1370 |
1371 // A CollectedHeap is divided into a dense sequence of "blocks"; that is, | |
1372 // each address in the (reserved) heap is a member of exactly | |
1373 // one block. The defining characteristic of a block is that it is | |
1374 // possible to find its size, and thus to progress forward to the next | |
1375 // block. (Blocks may be of different sizes.) Thus, blocks may | |
1376 // represent Java objects, or they might be free blocks in a | |
1377 // free-list-based heap (or subheap), as long as the two kinds are | |
1378 // distinguishable and the size of each is determinable. | |
1379 | |
1380 // Returns the address of the start of the "block" that contains the | |
1381 // address "addr". We say "blocks" instead of "object" since some heaps | |
1382 // may not pack objects densely; a chunk may either be an object or a | |
1383 // non-object. | |
1384 virtual HeapWord* block_start(const void* addr) const; | |
1385 | |
1386 // Requires "addr" to be the start of a chunk, and returns its size. | |
1387 // "addr + size" is required to be the start of a new chunk, or the end | |
1388 // of the active area of the heap. | |
1389 virtual size_t block_size(const HeapWord* addr) const; | |
1390 | |
1391 // Requires "addr" to be the start of a block, and returns "TRUE" iff | |
1392 // the block is an object. | |
1393 virtual bool block_is_obj(const HeapWord* addr) const; | |
1394 | |
1395 // Does this heap support heap inspection? (+PrintClassHistogram) | |
1396 virtual bool supports_heap_inspection() const { return true; } | |
1397 | |
1398 // Section on thread-local allocation buffers (TLABs) | |
1399 // See CollectedHeap for semantics. | |
1400 | |
1401 virtual bool supports_tlab_allocation() const; | |
1402 virtual size_t tlab_capacity(Thread* thr) const; | |
1403 virtual size_t unsafe_max_tlab_alloc(Thread* thr) const; | |
1404 | |
1405 // Can a compiler initialize a new object without store barriers? | |
1406 // This permission only extends from the creation of a new object | |
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1407 // via a TLAB up to the first subsequent safepoint. If such permission |
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1408 // is granted for this heap type, the compiler promises to call |
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1409 // defer_store_barrier() below on any slow path allocation of |
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1410 // a new object for which such initializing store barriers will |
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1411 // have been elided. G1, like CMS, allows this, but should be |
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1412 // ready to provide a compensating write barrier as necessary |
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1413 // if that storage came out of a non-young region. The efficiency |
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1414 // of this implementation depends crucially on being able to |
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1415 // answer very efficiently in constant time whether a piece of |
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1416 // storage in the heap comes from a young region or not. |
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1417 // See ReduceInitialCardMarks. |
342 | 1418 virtual bool can_elide_tlab_store_barriers() const { |
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1419 return true; |
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1420 } |
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1421 |
1166 | 1422 virtual bool card_mark_must_follow_store() const { |
1423 return true; | |
1424 } | |
1425 | |
3766 | 1426 bool is_in_young(const oop obj) { |
1027
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1427 HeapRegion* hr = heap_region_containing(obj); |
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1428 return hr != NULL && hr->is_young(); |
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1429 } |
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1430 |
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1431 #ifdef ASSERT |
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1432 virtual bool is_in_partial_collection(const void* p); |
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1433 #endif |
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1434 |
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1435 virtual bool is_scavengable(const void* addr); |
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1436 |
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1437 // We don't need barriers for initializing stores to objects |
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1438 // in the young gen: for the SATB pre-barrier, there is no |
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1439 // pre-value that needs to be remembered; for the remembered-set |
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1440 // update logging post-barrier, we don't maintain remembered set |
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1441 // information for young gen objects. |
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1442 virtual bool can_elide_initializing_store_barrier(oop new_obj) { |
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1443 return is_in_young(new_obj); |
342 | 1444 } |
1445 | |
1446 // Can a compiler elide a store barrier when it writes | |
1447 // a permanent oop into the heap? Applies when the compiler | |
1448 // is storing x to the heap, where x->is_perm() is true. | |
1449 virtual bool can_elide_permanent_oop_store_barriers() const { | |
1450 // At least until perm gen collection is also G1-ified, at | |
1451 // which point this should return false. | |
1452 return true; | |
1453 } | |
1454 | |
1455 // Returns "true" iff the given word_size is "very large". | |
1456 static bool isHumongous(size_t word_size) { | |
1313
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1457 // Note this has to be strictly greater-than as the TLABs |
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1458 // are capped at the humongous thresold and we want to |
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1459 // ensure that we don't try to allocate a TLAB as |
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1460 // humongous and that we don't allocate a humongous |
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1461 // object in a TLAB. |
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1462 return word_size > _humongous_object_threshold_in_words; |
342 | 1463 } |
1464 | |
1465 // Update mod union table with the set of dirty cards. | |
1466 void updateModUnion(); | |
1467 | |
1468 // Set the mod union bits corresponding to the given memRegion. Note | |
1469 // that this is always a safe operation, since it doesn't clear any | |
1470 // bits. | |
1471 void markModUnionRange(MemRegion mr); | |
1472 | |
1473 // Records the fact that a marking phase is no longer in progress. | |
1474 void set_marking_complete() { | |
1475 _mark_in_progress = false; | |
1476 } | |
1477 void set_marking_started() { | |
1478 _mark_in_progress = true; | |
1479 } | |
1480 bool mark_in_progress() { | |
1481 return _mark_in_progress; | |
1482 } | |
1483 | |
1484 // Print the maximum heap capacity. | |
1485 virtual size_t max_capacity() const; | |
1486 | |
1487 virtual jlong millis_since_last_gc(); | |
1488 | |
1489 // Perform any cleanup actions necessary before allowing a verification. | |
1490 virtual void prepare_for_verify(); | |
1491 | |
1492 // Perform verification. | |
811 | 1493 |
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1494 // vo == UsePrevMarking -> use "prev" marking information, |
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1495 // vo == UseNextMarking -> use "next" marking information |
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1496 // vo == UseMarkWord -> use the mark word in the object header |
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1497 // |
811 | 1498 // NOTE: Only the "prev" marking information is guaranteed to be |
1499 // consistent most of the time, so most calls to this should use | |
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1500 // vo == UsePrevMarking. |
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1501 // Currently, there is only one case where this is called with |
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1502 // vo == UseNextMarking, which is to verify the "next" marking |
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1503 // information at the end of remark. |
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1504 // Currently there is only one place where this is called with |
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1505 // vo == UseMarkWord, which is to verify the marking during a |
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1506 // full GC. |
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1507 void verify(bool allow_dirty, bool silent, VerifyOption vo); |
811 | 1508 |
1509 // Override; it uses the "prev" marking information | |
342 | 1510 virtual void verify(bool allow_dirty, bool silent); |
1511 virtual void print_on(outputStream* st) const; | |
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1512 virtual void print_extended_on(outputStream* st) const; |
342 | 1513 |
1514 virtual void print_gc_threads_on(outputStream* st) const; | |
1515 virtual void gc_threads_do(ThreadClosure* tc) const; | |
1516 | |
1517 // Override | |
1518 void print_tracing_info() const; | |
1519 | |
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1520 // The following two methods are helpful for debugging RSet issues. |
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1521 void print_cset_rsets() PRODUCT_RETURN; |
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1522 void print_all_rsets() PRODUCT_RETURN; |
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1523 |
342 | 1524 // Convenience function to be used in situations where the heap type can be |
1525 // asserted to be this type. | |
1526 static G1CollectedHeap* heap(); | |
1527 | |
1528 void set_region_short_lived_locked(HeapRegion* hr); | |
1529 // add appropriate methods for any other surv rate groups | |
1530 | |
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1531 YoungList* young_list() { return _young_list; } |
342 | 1532 |
1533 // debugging | |
1534 bool check_young_list_well_formed() { | |
1535 return _young_list->check_list_well_formed(); | |
1536 } | |
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1537 |
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1538 bool check_young_list_empty(bool check_heap, |
342 | 1539 bool check_sample = true); |
1540 | |
1541 // *** Stuff related to concurrent marking. It's not clear to me that so | |
1542 // many of these need to be public. | |
1543 | |
1544 // The functions below are helper functions that a subclass of | |
1545 // "CollectedHeap" can use in the implementation of its virtual | |
1546 // functions. | |
1547 // This performs a concurrent marking of the live objects in a | |
1548 // bitmap off to the side. | |
1549 void doConcurrentMark(); | |
1550 | |
1551 bool isMarkedPrev(oop obj) const; | |
1552 bool isMarkedNext(oop obj) const; | |
1553 | |
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1554 // vo == UsePrevMarking -> use "prev" marking information, |
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1555 // vo == UseNextMarking -> use "next" marking information, |
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1556 // vo == UseMarkWord -> use mark word from object header |
811 | 1557 bool is_obj_dead_cond(const oop obj, |
1558 const HeapRegion* hr, | |
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1559 const VerifyOption vo) const { |
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1560 |
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1561 switch (vo) { |
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1562 case VerifyOption_G1UsePrevMarking: |
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1563 return is_obj_dead(obj, hr); |
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1564 case VerifyOption_G1UseNextMarking: |
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1565 return is_obj_ill(obj, hr); |
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1566 default: |
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1567 assert(vo == VerifyOption_G1UseMarkWord, "must be"); |
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1568 return !obj->is_gc_marked(); |
811 | 1569 } |
1570 } | |
1571 | |
342 | 1572 // Determine if an object is dead, given the object and also |
1573 // the region to which the object belongs. An object is dead | |
1574 // iff a) it was not allocated since the last mark and b) it | |
1575 // is not marked. | |
1576 | |
1577 bool is_obj_dead(const oop obj, const HeapRegion* hr) const { | |
1578 return | |
1579 !hr->obj_allocated_since_prev_marking(obj) && | |
1580 !isMarkedPrev(obj); | |
1581 } | |
1582 | |
1583 // This is used when copying an object to survivor space. | |
1584 // If the object is marked live, then we mark the copy live. | |
1585 // If the object is allocated since the start of this mark | |
1586 // cycle, then we mark the copy live. | |
1587 // If the object has been around since the previous mark | |
1588 // phase, and hasn't been marked yet during this phase, | |
1589 // then we don't mark it, we just wait for the | |
1590 // current marking cycle to get to it. | |
1591 | |
1592 // This function returns true when an object has been | |
1593 // around since the previous marking and hasn't yet | |
1594 // been marked during this marking. | |
1595 | |
1596 bool is_obj_ill(const oop obj, const HeapRegion* hr) const { | |
1597 return | |
1598 !hr->obj_allocated_since_next_marking(obj) && | |
1599 !isMarkedNext(obj); | |
1600 } | |
1601 | |
1602 // Determine if an object is dead, given only the object itself. | |
1603 // This will find the region to which the object belongs and | |
1604 // then call the region version of the same function. | |
1605 | |
1606 // Added if it is in permanent gen it isn't dead. | |
1607 // Added if it is NULL it isn't dead. | |
1608 | |
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1609 // vo == UsePrevMarking -> use "prev" marking information, |
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1610 // vo == UseNextMarking -> use "next" marking information, |
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1611 // vo == UseMarkWord -> use mark word from object header |
811 | 1612 bool is_obj_dead_cond(const oop obj, |
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1613 const VerifyOption vo) const { |
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1614 |
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1615 switch (vo) { |
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1616 case VerifyOption_G1UsePrevMarking: |
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1617 return is_obj_dead(obj); |
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1618 case VerifyOption_G1UseNextMarking: |
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1619 return is_obj_ill(obj); |
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1620 default: |
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1621 assert(vo == VerifyOption_G1UseMarkWord, "must be"); |
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1622 return !obj->is_gc_marked(); |
811 | 1623 } |
1624 } | |
1625 | |
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1626 bool is_obj_dead(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_dead(obj, hr); | |
1635 } | |
1636 | |
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1637 bool is_obj_ill(const oop obj) const { |
811 | 1638 const HeapRegion* hr = heap_region_containing(obj); |
342 | 1639 if (hr == NULL) { |
1640 if (Universe::heap()->is_in_permanent(obj)) | |
1641 return false; | |
1642 else if (obj == NULL) return false; | |
1643 else return true; | |
1644 } | |
1645 else return is_obj_ill(obj, hr); | |
1646 } | |
1647 | |
1648 // The following is just to alert the verification code | |
1649 // that a full collection has occurred and that the | |
1650 // remembered sets are no longer up to date. | |
1651 bool _full_collection; | |
1652 void set_full_collection() { _full_collection = true;} | |
1653 void clear_full_collection() {_full_collection = false;} | |
1654 bool full_collection() {return _full_collection;} | |
1655 | |
1656 ConcurrentMark* concurrent_mark() const { return _cm; } | |
1657 ConcurrentG1Refine* concurrent_g1_refine() const { return _cg1r; } | |
1658 | |
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1659 // The dirty cards region list is used to record a subset of regions |
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1660 // whose cards need clearing. The list if populated during the |
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1661 // remembered set scanning and drained during the card table |
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1662 // cleanup. Although the methods are reentrant, population/draining |
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1663 // phases must not overlap. For synchronization purposes the last |
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1664 // element on the list points to itself. |
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1665 HeapRegion* _dirty_cards_region_list; |
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1666 void push_dirty_cards_region(HeapRegion* hr); |
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1667 HeapRegion* pop_dirty_cards_region(); |
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1668 |
342 | 1669 public: |
1670 void stop_conc_gc_threads(); | |
1671 | |
1672 size_t pending_card_num(); | |
1673 size_t max_pending_card_num(); | |
1674 size_t cards_scanned(); | |
1675 | |
1676 protected: | |
1677 size_t _max_heap_capacity; | |
1678 }; | |
1679 | |
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1680 class G1ParGCAllocBuffer: public ParGCAllocBuffer { |
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1681 private: |
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1682 bool _retired; |
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1683 |
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1684 public: |
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1685 G1ParGCAllocBuffer(size_t gclab_word_size); |
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1686 |
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1687 void set_buf(HeapWord* buf) { |
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1688 ParGCAllocBuffer::set_buf(buf); |
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1689 _retired = false; |
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1690 } |
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1691 |
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1692 void retire(bool end_of_gc, bool retain) { |
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1693 if (_retired) |
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|
1694 return; |
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1695 ParGCAllocBuffer::retire(end_of_gc, retain); |
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1696 _retired = true; |
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|
1697 } |
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|
1698 }; |
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1699 |
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1700 class G1ParScanThreadState : public StackObj { |
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1701 protected: |
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1702 G1CollectedHeap* _g1h; |
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1703 RefToScanQueue* _refs; |
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1704 DirtyCardQueue _dcq; |
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1705 CardTableModRefBS* _ct_bs; |
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1706 G1RemSet* _g1_rem; |
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1707 |
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1708 G1ParGCAllocBuffer _surviving_alloc_buffer; |
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1709 G1ParGCAllocBuffer _tenured_alloc_buffer; |
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1710 G1ParGCAllocBuffer* _alloc_buffers[GCAllocPurposeCount]; |
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1711 ageTable _age_table; |
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1712 |
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1713 size_t _alloc_buffer_waste; |
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1714 size_t _undo_waste; |
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1715 |
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1716 OopsInHeapRegionClosure* _evac_failure_cl; |
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1717 G1ParScanHeapEvacClosure* _evac_cl; |
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1718 G1ParScanPartialArrayClosure* _partial_scan_cl; |
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1719 |
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1720 int _hash_seed; |
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1721 uint _queue_num; |
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1722 |
1611 | 1723 size_t _term_attempts; |
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1724 |
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1725 double _start; |
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1726 double _start_strong_roots; |
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1727 double _strong_roots_time; |
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1728 double _start_term; |
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1729 double _term_time; |
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1730 |
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1731 // Map from young-age-index (0 == not young, 1 is youngest) to |
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1732 // surviving words. base is what we get back from the malloc call |
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1733 size_t* _surviving_young_words_base; |
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1734 // this points into the array, as we use the first few entries for padding |
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1735 size_t* _surviving_young_words; |
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1736 |
1709 | 1737 #define PADDING_ELEM_NUM (DEFAULT_CACHE_LINE_SIZE / sizeof(size_t)) |
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1738 |
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1739 void add_to_alloc_buffer_waste(size_t waste) { _alloc_buffer_waste += waste; } |
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1740 |
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1741 void add_to_undo_waste(size_t waste) { _undo_waste += waste; } |
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1742 |
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1743 DirtyCardQueue& dirty_card_queue() { return _dcq; } |
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1744 CardTableModRefBS* ctbs() { return _ct_bs; } |
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1745 |
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1746 template <class T> void immediate_rs_update(HeapRegion* from, T* p, int tid) { |
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1747 if (!from->is_survivor()) { |
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1748 _g1_rem->par_write_ref(from, p, tid); |
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1749 } |
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1750 } |
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1751 |
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1752 template <class T> void deferred_rs_update(HeapRegion* from, T* p, int tid) { |
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1753 // If the new value of the field points to the same region or |
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1754 // is the to-space, we don't need to include it in the Rset updates. |
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1755 if (!from->is_in_reserved(oopDesc::load_decode_heap_oop(p)) && !from->is_survivor()) { |
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1756 size_t card_index = ctbs()->index_for(p); |
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1757 // If the card hasn't been added to the buffer, do it. |
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1758 if (ctbs()->mark_card_deferred(card_index)) { |
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1759 dirty_card_queue().enqueue((jbyte*)ctbs()->byte_for_index(card_index)); |
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1760 } |
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1761 } |
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1762 } |
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1763 |
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1764 public: |
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1765 G1ParScanThreadState(G1CollectedHeap* g1h, uint queue_num); |
845
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1766 |
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1767 ~G1ParScanThreadState() { |
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1768 FREE_C_HEAP_ARRAY(size_t, _surviving_young_words_base); |
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1769 } |
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1770 |
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1771 RefToScanQueue* refs() { return _refs; } |
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1772 ageTable* age_table() { return &_age_table; } |
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1773 |
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1774 G1ParGCAllocBuffer* alloc_buffer(GCAllocPurpose purpose) { |
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1775 return _alloc_buffers[purpose]; |
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1776 } |
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1777 |
1709 | 1778 size_t alloc_buffer_waste() const { return _alloc_buffer_waste; } |
1779 size_t undo_waste() const { return _undo_waste; } | |
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1780 |
1862
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1781 #ifdef ASSERT |
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1782 bool verify_ref(narrowOop* ref) const; |
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1783 bool verify_ref(oop* ref) const; |
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1784 bool verify_task(StarTask ref) const; |
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1785 #endif // ASSERT |
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1786 |
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1787 template <class T> void push_on_queue(T* ref) { |
1862
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1788 assert(verify_ref(ref), "sanity"); |
1709 | 1789 refs()->push(ref); |
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1790 } |
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1791 |
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1792 template <class T> void update_rs(HeapRegion* from, T* p, int tid) { |
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1793 if (G1DeferredRSUpdate) { |
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1794 deferred_rs_update(from, p, tid); |
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1795 } else { |
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1796 immediate_rs_update(from, p, tid); |
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1797 } |
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1798 } |
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1799 |
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1800 HeapWord* allocate_slow(GCAllocPurpose purpose, size_t word_sz) { |
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1801 |
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1802 HeapWord* obj = NULL; |
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1803 size_t gclab_word_size = _g1h->desired_plab_sz(purpose); |
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1804 if (word_sz * 100 < gclab_word_size * ParallelGCBufferWastePct) { |
845
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1805 G1ParGCAllocBuffer* alloc_buf = alloc_buffer(purpose); |
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1806 assert(gclab_word_size == alloc_buf->word_sz(), |
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1807 "dynamic resizing is not supported"); |
845
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1808 add_to_alloc_buffer_waste(alloc_buf->words_remaining()); |
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1809 alloc_buf->retire(false, false); |
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1810 |
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1811 HeapWord* buf = _g1h->par_allocate_during_gc(purpose, gclab_word_size); |
845
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1812 if (buf == NULL) return NULL; // Let caller handle allocation failure. |
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1813 // Otherwise. |
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1814 alloc_buf->set_buf(buf); |
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1815 |
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1816 obj = alloc_buf->allocate(word_sz); |
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1817 assert(obj != NULL, "buffer was definitely big enough..."); |
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1818 } else { |
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1819 obj = _g1h->par_allocate_during_gc(purpose, word_sz); |
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1820 } |
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1821 return obj; |
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1822 } |
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1823 |
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1824 HeapWord* allocate(GCAllocPurpose purpose, size_t word_sz) { |
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1825 HeapWord* obj = alloc_buffer(purpose)->allocate(word_sz); |
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1826 if (obj != NULL) return obj; |
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1827 return allocate_slow(purpose, word_sz); |
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1828 } |
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1829 |
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1830 void undo_allocation(GCAllocPurpose purpose, HeapWord* obj, size_t word_sz) { |
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1831 if (alloc_buffer(purpose)->contains(obj)) { |
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1832 assert(alloc_buffer(purpose)->contains(obj + word_sz - 1), |
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1833 "should contain whole object"); |
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1834 alloc_buffer(purpose)->undo_allocation(obj, word_sz); |
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1835 } else { |
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1836 CollectedHeap::fill_with_object(obj, word_sz); |
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1837 add_to_undo_waste(word_sz); |
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1838 } |
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1839 } |
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1840 |
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1841 void set_evac_failure_closure(OopsInHeapRegionClosure* evac_failure_cl) { |
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1842 _evac_failure_cl = evac_failure_cl; |
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1843 } |
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1844 OopsInHeapRegionClosure* evac_failure_closure() { |
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1845 return _evac_failure_cl; |
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1846 } |
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1847 |
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1848 void set_evac_closure(G1ParScanHeapEvacClosure* evac_cl) { |
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1849 _evac_cl = evac_cl; |
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1850 } |
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1851 |
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1852 void set_partial_scan_closure(G1ParScanPartialArrayClosure* partial_scan_cl) { |
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1853 _partial_scan_cl = partial_scan_cl; |
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1854 } |
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1855 |
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1856 int* hash_seed() { return &_hash_seed; } |
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1857 uint queue_num() { return _queue_num; } |
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1858 |
1709 | 1859 size_t term_attempts() const { return _term_attempts; } |
1611 | 1860 void note_term_attempt() { _term_attempts++; } |
845
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1861 |
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1862 void start_strong_roots() { |
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1863 _start_strong_roots = os::elapsedTime(); |
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1864 } |
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1865 void end_strong_roots() { |
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1866 _strong_roots_time += (os::elapsedTime() - _start_strong_roots); |
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1867 } |
1709 | 1868 double strong_roots_time() const { return _strong_roots_time; } |
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1869 |
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1870 void start_term_time() { |
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1871 note_term_attempt(); |
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1872 _start_term = os::elapsedTime(); |
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1873 } |
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1874 void end_term_time() { |
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1875 _term_time += (os::elapsedTime() - _start_term); |
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1876 } |
1709 | 1877 double term_time() const { return _term_time; } |
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1878 |
1709 | 1879 double elapsed_time() const { |
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1880 return os::elapsedTime() - _start; |
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1881 } |
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1882 |
1709 | 1883 static void |
1884 print_termination_stats_hdr(outputStream* const st = gclog_or_tty); | |
1885 void | |
1886 print_termination_stats(int i, outputStream* const st = gclog_or_tty) const; | |
1887 | |
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1888 size_t* surviving_young_words() { |
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1889 // We add on to hide entry 0 which accumulates surviving words for |
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1890 // age -1 regions (i.e. non-young ones) |
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1891 return _surviving_young_words; |
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1892 } |
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1893 |
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1894 void retire_alloc_buffers() { |
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1895 for (int ap = 0; ap < GCAllocPurposeCount; ++ap) { |
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1896 size_t waste = _alloc_buffers[ap]->words_remaining(); |
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1897 add_to_alloc_buffer_waste(waste); |
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1898 _alloc_buffers[ap]->retire(true, false); |
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1899 } |
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1900 } |
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1901 |
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1902 template <class T> void deal_with_reference(T* ref_to_scan) { |
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1903 if (has_partial_array_mask(ref_to_scan)) { |
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1904 _partial_scan_cl->do_oop_nv(ref_to_scan); |
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1905 } else { |
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1906 // Note: we can use "raw" versions of "region_containing" because |
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1907 // "obj_to_scan" is definitely in the heap, and is not in a |
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1908 // humongous region. |
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1909 HeapRegion* r = _g1h->heap_region_containing_raw(ref_to_scan); |
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1910 _evac_cl->set_region(r); |
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1911 _evac_cl->do_oop_nv(ref_to_scan); |
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1912 } |
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1913 } |
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1914 |
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1915 void deal_with_reference(StarTask ref) { |
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1916 assert(verify_task(ref), "sanity"); |
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1917 if (ref.is_narrow()) { |
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1918 deal_with_reference((narrowOop*)ref); |
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1919 } else { |
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1920 deal_with_reference((oop*)ref); |
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1921 } |
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1922 } |
1862
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1923 |
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1924 public: |
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1925 void trim_queue(); |
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1926 }; |
1972 | 1927 |
1928 #endif // SHARE_VM_GC_IMPLEMENTATION_G1_G1COLLECTEDHEAP_HPP |