Mercurial > hg > truffle
annotate src/share/vm/gc_implementation/g1/g1CollectedHeap.hpp @ 6615:09aad8452938
7190310: Inlining WeakReference.get(), and hoisting $referent may lead to non-terminating loops
Summary: In C2 add software membar after load from Reference.referent field to prevent commoning of loads across safepoint since GC can change its value. In C1 always generate Reference.get() intrinsic.
Reviewed-by: roland, twisti, dholmes, johnc
author | kvn |
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date | Mon, 20 Aug 2012 09:58:58 -0700 |
parents | a2f7274eb6ef |
children | aaf61e68b255 |
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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 |
6197 | 65 typedef OverflowTaskQueue<StarTask, mtGC> RefToScanQueue; |
66 typedef GenericTaskQueueSet<RefToScanQueue, mtGC> 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 | |
6197 | 77 class YoungList : public CHeapObj<mtGC> { |
342 | 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 |
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88 uint _length; |
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89 uint _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 uint length() { return _length; } |
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105 uint 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 (size_t) (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 (size_t) 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. | |
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250 uint _expansion_regions; |
342 | 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. | |
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342 uint _in_cset_fast_test_length; |
526 | 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 "old marking cycles" (i.e., Full GCs or |
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363 // concurrent cycles) we have started. |
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364 volatile unsigned int _old_marking_cycles_started; |
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365 |
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366 // Keeps track of how many "old marking cycles" (i.e., Full GCs or |
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367 // concurrent cycles) we have completed. |
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368 volatile unsigned int _old_marking_cycles_completed; |
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369 |
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370 // This is a non-product method that is helpful for testing. It is |
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371 // called at the end of a GC and artificially expands the heap by |
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372 // allocating a number of dead regions. This way we can induce very |
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373 // frequent marking cycles and stress the cleanup / concurrent |
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374 // cleanup code more (as all the regions that will be allocated by |
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375 // this method will be found dead by the marking cycle). |
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376 void allocate_dummy_regions() PRODUCT_RETURN; |
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377 |
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378 // Clear RSets after a compaction. It also resets the GC time stamps. |
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379 void clear_rsets_post_compaction(); |
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380 |
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381 // If the HR printer is active, dump the state of the regions in the |
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382 // heap after a compaction. |
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383 void print_hrs_post_compaction(); |
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384 |
1973 | 385 // These are macros so that, if the assert fires, we get the correct |
386 // line number, file, etc. | |
387 | |
2361 | 388 #define heap_locking_asserts_err_msg(_extra_message_) \ |
2152 | 389 err_msg("%s : Heap_lock locked: %s, at safepoint: %s, is VM thread: %s", \ |
2361 | 390 (_extra_message_), \ |
2152 | 391 BOOL_TO_STR(Heap_lock->owned_by_self()), \ |
392 BOOL_TO_STR(SafepointSynchronize::is_at_safepoint()), \ | |
393 BOOL_TO_STR(Thread::current()->is_VM_thread())) | |
1973 | 394 |
395 #define assert_heap_locked() \ | |
396 do { \ | |
397 assert(Heap_lock->owned_by_self(), \ | |
398 heap_locking_asserts_err_msg("should be holding the Heap_lock")); \ | |
399 } while (0) | |
400 | |
2361 | 401 #define assert_heap_locked_or_at_safepoint(_should_be_vm_thread_) \ |
1973 | 402 do { \ |
403 assert(Heap_lock->owned_by_self() || \ | |
2152 | 404 (SafepointSynchronize::is_at_safepoint() && \ |
2361 | 405 ((_should_be_vm_thread_) == Thread::current()->is_VM_thread())), \ |
1973 | 406 heap_locking_asserts_err_msg("should be holding the Heap_lock or " \ |
407 "should be at a safepoint")); \ | |
408 } while (0) | |
409 | |
410 #define assert_heap_locked_and_not_at_safepoint() \ | |
411 do { \ | |
412 assert(Heap_lock->owned_by_self() && \ | |
413 !SafepointSynchronize::is_at_safepoint(), \ | |
414 heap_locking_asserts_err_msg("should be holding the Heap_lock and " \ | |
415 "should not be at a safepoint")); \ | |
416 } while (0) | |
417 | |
418 #define assert_heap_not_locked() \ | |
419 do { \ | |
420 assert(!Heap_lock->owned_by_self(), \ | |
421 heap_locking_asserts_err_msg("should not be holding the Heap_lock")); \ | |
422 } while (0) | |
423 | |
424 #define assert_heap_not_locked_and_not_at_safepoint() \ | |
425 do { \ | |
426 assert(!Heap_lock->owned_by_self() && \ | |
427 !SafepointSynchronize::is_at_safepoint(), \ | |
428 heap_locking_asserts_err_msg("should not be holding the Heap_lock and " \ | |
429 "should not be at a safepoint")); \ | |
430 } while (0) | |
431 | |
2361 | 432 #define assert_at_safepoint(_should_be_vm_thread_) \ |
1973 | 433 do { \ |
2152 | 434 assert(SafepointSynchronize::is_at_safepoint() && \ |
2361 | 435 ((_should_be_vm_thread_) == Thread::current()->is_VM_thread()), \ |
1973 | 436 heap_locking_asserts_err_msg("should be at a safepoint")); \ |
437 } while (0) | |
438 | |
439 #define assert_not_at_safepoint() \ | |
440 do { \ | |
441 assert(!SafepointSynchronize::is_at_safepoint(), \ | |
442 heap_locking_asserts_err_msg("should not be at a safepoint")); \ | |
443 } while (0) | |
444 | |
342 | 445 protected: |
446 | |
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447 // The young region list. |
342 | 448 YoungList* _young_list; |
449 | |
450 // The current policy object for the collector. | |
451 G1CollectorPolicy* _g1_policy; | |
452 | |
2152 | 453 // This is the second level of trying to allocate a new region. If |
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454 // new_region() didn't find a region on the free_list, this call will |
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455 // check whether there's anything available on the |
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456 // secondary_free_list and/or wait for more regions to appear on |
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457 // that list, if _free_regions_coming is set. |
2361 | 458 HeapRegion* new_region_try_secondary_free_list(); |
342 | 459 |
2361 | 460 // Try to allocate a single non-humongous HeapRegion sufficient for |
461 // an allocation of the given word_size. If do_expand is true, | |
462 // attempt to expand the heap if necessary to satisfy the allocation | |
463 // request. | |
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464 HeapRegion* new_region(size_t word_size, bool do_expand); |
342 | 465 |
2361 | 466 // Attempt to satisfy a humongous allocation request of the given |
467 // size by finding a contiguous set of free regions of num_regions | |
468 // length and remove them from the master free list. Return the | |
3766 | 469 // index of the first region or G1_NULL_HRS_INDEX if the search |
470 // was unsuccessful. | |
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471 uint humongous_obj_allocate_find_first(uint num_regions, |
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472 size_t word_size); |
342 | 473 |
2361 | 474 // Initialize a contiguous set of free regions of length num_regions |
475 // and starting at index first so that they appear as a single | |
476 // humongous region. | |
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477 HeapWord* humongous_obj_allocate_initialize_regions(uint first, |
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478 uint num_regions, |
2361 | 479 size_t word_size); |
480 | |
481 // Attempt to allocate a humongous object of the given size. Return | |
482 // NULL if unsuccessful. | |
2152 | 483 HeapWord* humongous_obj_allocate(size_t word_size); |
1973 | 484 |
485 // The following two methods, allocate_new_tlab() and | |
486 // mem_allocate(), are the two main entry points from the runtime | |
487 // into the G1's allocation routines. They have the following | |
488 // assumptions: | |
489 // | |
490 // * They should both be called outside safepoints. | |
491 // | |
492 // * They should both be called without holding the Heap_lock. | |
493 // | |
494 // * All allocation requests for new TLABs should go to | |
495 // allocate_new_tlab(). | |
496 // | |
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497 // * All non-TLAB allocation requests should go to mem_allocate(). |
1973 | 498 // |
499 // * If either call cannot satisfy the allocation request using the | |
500 // current allocating region, they will try to get a new one. If | |
501 // this fails, they will attempt to do an evacuation pause and | |
502 // retry the allocation. | |
503 // | |
504 // * If all allocation attempts fail, even after trying to schedule | |
505 // an evacuation pause, allocate_new_tlab() will return NULL, | |
506 // whereas mem_allocate() will attempt a heap expansion and/or | |
507 // schedule a Full GC. | |
508 // | |
509 // * We do not allow humongous-sized TLABs. So, allocate_new_tlab | |
510 // should never be called with word_size being humongous. All | |
511 // humongous allocation requests should go to mem_allocate() which | |
512 // will satisfy them with a special path. | |
513 | |
514 virtual HeapWord* allocate_new_tlab(size_t word_size); | |
515 | |
516 virtual HeapWord* mem_allocate(size_t word_size, | |
517 bool* gc_overhead_limit_was_exceeded); | |
342 | 518 |
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519 // The following three methods take a gc_count_before_ret |
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520 // parameter which is used to return the GC count if the method |
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521 // returns NULL. Given that we are required to read the GC count |
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522 // while holding the Heap_lock, and these paths will take the |
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523 // Heap_lock at some point, it's easier to get them to read the GC |
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524 // count while holding the Heap_lock before they return NULL instead |
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525 // of the caller (namely: mem_allocate()) having to also take the |
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526 // Heap_lock just to read the GC count. |
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527 |
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528 // First-level mutator allocation attempt: try to allocate out of |
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529 // the mutator alloc region without taking the Heap_lock. This |
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530 // should only be used for non-humongous allocations. |
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531 inline HeapWord* attempt_allocation(size_t word_size, |
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532 unsigned int* gc_count_before_ret); |
342 | 533 |
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534 // Second-level mutator allocation attempt: take the Heap_lock and |
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535 // retry the allocation attempt, potentially scheduling a GC |
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536 // pause. This should only be used for non-humongous allocations. |
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537 HeapWord* attempt_allocation_slow(size_t word_size, |
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538 unsigned int* gc_count_before_ret); |
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539 |
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540 // Takes the Heap_lock and attempts a humongous allocation. It can |
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541 // potentially schedule a GC pause. |
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542 HeapWord* attempt_allocation_humongous(size_t word_size, |
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543 unsigned int* gc_count_before_ret); |
1973 | 544 |
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545 // Allocation attempt that should be called during safepoints (e.g., |
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546 // at the end of a successful GC). expect_null_mutator_alloc_region |
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547 // specifies whether the mutator alloc region is expected to be NULL |
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548 // or not. |
1973 | 549 HeapWord* attempt_allocation_at_safepoint(size_t word_size, |
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550 bool expect_null_mutator_alloc_region); |
1973 | 551 |
552 // It dirties the cards that cover the block so that so that the post | |
553 // write barrier never queues anything when updating objects on this | |
554 // block. It is assumed (and in fact we assert) that the block | |
555 // belongs to a young region. | |
556 inline void dirty_young_block(HeapWord* start, size_t word_size); | |
342 | 557 |
558 // Allocate blocks during garbage collection. Will ensure an | |
559 // allocation region, either by picking one or expanding the | |
560 // heap, and then allocate a block of the given size. The block | |
561 // may not be a humongous - it must fit into a single heap region. | |
562 HeapWord* par_allocate_during_gc(GCAllocPurpose purpose, size_t word_size); | |
563 | |
564 HeapWord* allocate_during_gc_slow(GCAllocPurpose purpose, | |
565 HeapRegion* alloc_region, | |
566 bool par, | |
567 size_t word_size); | |
568 | |
569 // Ensure that no further allocations can happen in "r", bearing in mind | |
570 // that parallel threads might be attempting allocations. | |
571 void par_allocate_remaining_space(HeapRegion* r); | |
572 | |
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573 // Allocation attempt during GC for a survivor object / PLAB. |
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574 inline HeapWord* survivor_attempt_allocation(size_t word_size); |
545 | 575 |
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576 // Allocation attempt during GC for an old object / PLAB. |
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577 inline HeapWord* old_attempt_allocation(size_t word_size); |
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578 |
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579 // These methods are the "callbacks" from the G1AllocRegion class. |
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580 |
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581 // For mutator alloc regions. |
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582 HeapRegion* new_mutator_alloc_region(size_t word_size, bool force); |
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583 void retire_mutator_alloc_region(HeapRegion* alloc_region, |
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584 size_t allocated_bytes); |
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585 |
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586 // For GC alloc regions. |
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587 HeapRegion* new_gc_alloc_region(size_t word_size, uint count, |
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588 GCAllocPurpose ap); |
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589 void retire_gc_alloc_region(HeapRegion* alloc_region, |
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590 size_t allocated_bytes, GCAllocPurpose ap); |
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591 |
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592 // - if explicit_gc is true, the GC is for a System.gc() or a heap |
1973 | 593 // inspection request and should collect the entire heap |
594 // - if clear_all_soft_refs is true, all soft references should be | |
595 // cleared during the GC | |
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596 // - if explicit_gc is false, word_size describes the allocation that |
1973 | 597 // the GC should attempt (at least) to satisfy |
598 // - it returns false if it is unable to do the collection due to the | |
599 // GC locker being active, true otherwise | |
600 bool do_collection(bool explicit_gc, | |
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601 bool clear_all_soft_refs, |
342 | 602 size_t word_size); |
603 | |
604 // Callback from VM_G1CollectFull operation. | |
605 // Perform a full collection. | |
606 void do_full_collection(bool clear_all_soft_refs); | |
607 | |
608 // Resize the heap if necessary after a full collection. If this is | |
609 // after a collect-for allocation, "word_size" is the allocation size, | |
610 // and will be considered part of the used portion of the heap. | |
611 void resize_if_necessary_after_full_collection(size_t word_size); | |
612 | |
613 // Callback from VM_G1CollectForAllocation operation. | |
614 // This function does everything necessary/possible to satisfy a | |
615 // failed allocation request (including collection, expansion, etc.) | |
1973 | 616 HeapWord* satisfy_failed_allocation(size_t word_size, bool* succeeded); |
342 | 617 |
618 // Attempting to expand the heap sufficiently | |
619 // to support an allocation of the given "word_size". If | |
620 // successful, perform the allocation and return the address of the | |
621 // allocated block, or else "NULL". | |
1973 | 622 HeapWord* expand_and_allocate(size_t word_size); |
342 | 623 |
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624 // Process any reference objects discovered during |
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625 // an incremental evacuation pause. |
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626 void process_discovered_references(); |
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627 |
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628 // Enqueue any remaining discovered references |
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629 // after processing. |
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630 void enqueue_discovered_references(); |
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631 |
342 | 632 public: |
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633 |
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634 G1MonitoringSupport* g1mm() { |
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635 assert(_g1mm != NULL, "should have been initialized"); |
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636 return _g1mm; |
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637 } |
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638 |
342 | 639 // Expand the garbage-first heap by at least the given size (in bytes!). |
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640 // Returns true if the heap was expanded by the requested amount; |
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641 // false otherwise. |
342 | 642 // (Rounds up to a HeapRegion boundary.) |
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643 bool expand(size_t expand_bytes); |
342 | 644 |
645 // Do anything common to GC's. | |
646 virtual void gc_prologue(bool full); | |
647 virtual void gc_epilogue(bool full); | |
648 | |
526 | 649 // We register a region with the fast "in collection set" test. We |
650 // simply set to true the array slot corresponding to this region. | |
651 void register_region_with_in_cset_fast_test(HeapRegion* r) { | |
652 assert(_in_cset_fast_test_base != NULL, "sanity"); | |
653 assert(r->in_collection_set(), "invariant"); | |
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654 uint index = r->hrs_index(); |
3766 | 655 assert(index < _in_cset_fast_test_length, "invariant"); |
526 | 656 assert(!_in_cset_fast_test_base[index], "invariant"); |
657 _in_cset_fast_test_base[index] = true; | |
658 } | |
659 | |
660 // This is a fast test on whether a reference points into the | |
661 // collection set or not. It does not assume that the reference | |
662 // points into the heap; if it doesn't, it will return false. | |
663 bool in_cset_fast_test(oop obj) { | |
664 assert(_in_cset_fast_test != NULL, "sanity"); | |
665 if (_g1_committed.contains((HeapWord*) obj)) { | |
666 // no need to subtract the bottom of the heap from obj, | |
667 // _in_cset_fast_test is biased | |
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668 uintx index = (uintx) obj >> HeapRegion::LogOfHRGrainBytes; |
526 | 669 bool ret = _in_cset_fast_test[index]; |
670 // let's make sure the result is consistent with what the slower | |
671 // test returns | |
672 assert( ret || !obj_in_cs(obj), "sanity"); | |
673 assert(!ret || obj_in_cs(obj), "sanity"); | |
674 return ret; | |
675 } else { | |
676 return false; | |
677 } | |
678 } | |
679 | |
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680 void clear_cset_fast_test() { |
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681 assert(_in_cset_fast_test_base != NULL, "sanity"); |
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682 memset(_in_cset_fast_test_base, false, |
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683 (size_t) _in_cset_fast_test_length * sizeof(bool)); |
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684 } |
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685 |
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686 // This is called at the start of either a concurrent cycle or a Full |
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687 // GC to update the number of old marking cycles started. |
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688 void increment_old_marking_cycles_started(); |
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689 |
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690 // This is called at the end of either a concurrent cycle or a Full |
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691 // GC to update the number of old marking cycles completed. Those two |
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692 // can happen in a nested fashion, i.e., we start a concurrent |
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693 // cycle, a Full GC happens half-way through it which ends first, |
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694 // and then the cycle notices that a Full GC happened and ends |
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695 // too. The concurrent parameter is a boolean to help us do a bit |
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696 // tighter consistency checking in the method. If concurrent is |
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697 // false, the caller is the inner caller in the nesting (i.e., the |
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698 // Full GC). If concurrent is true, the caller is the outer caller |
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699 // in this nesting (i.e., the concurrent cycle). Further nesting is |
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700 // not currently supported. The end of this call also notifies |
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701 // the FullGCCount_lock in case a Java thread is waiting for a full |
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702 // GC to happen (e.g., it called System.gc() with |
1656
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703 // +ExplicitGCInvokesConcurrent). |
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704 void increment_old_marking_cycles_completed(bool concurrent); |
1656
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705 |
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706 unsigned int old_marking_cycles_completed() { |
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707 return _old_marking_cycles_completed; |
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708 } |
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709 |
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710 G1HRPrinter* hr_printer() { return &_hr_printer; } |
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711 |
342 | 712 protected: |
713 | |
714 // Shrink the garbage-first heap by at most the given size (in bytes!). | |
715 // (Rounds down to a HeapRegion boundary.) | |
716 virtual void shrink(size_t expand_bytes); | |
717 void shrink_helper(size_t expand_bytes); | |
718 | |
1709 | 719 #if TASKQUEUE_STATS |
720 static void print_taskqueue_stats_hdr(outputStream* const st = gclog_or_tty); | |
721 void print_taskqueue_stats(outputStream* const st = gclog_or_tty) const; | |
722 void reset_taskqueue_stats(); | |
723 #endif // TASKQUEUE_STATS | |
724 | |
1973 | 725 // Schedule the VM operation that will do an evacuation pause to |
726 // satisfy an allocation request of word_size. *succeeded will | |
727 // return whether the VM operation was successful (it did do an | |
728 // evacuation pause) or not (another thread beat us to it or the GC | |
729 // locker was active). Given that we should not be holding the | |
730 // Heap_lock when we enter this method, we will pass the | |
731 // gc_count_before (i.e., total_collections()) as a parameter since | |
732 // it has to be read while holding the Heap_lock. Currently, both | |
733 // methods that call do_collection_pause() release the Heap_lock | |
734 // before the call, so it's easy to read gc_count_before just before. | |
735 HeapWord* do_collection_pause(size_t word_size, | |
736 unsigned int gc_count_before, | |
737 bool* succeeded); | |
342 | 738 |
739 // The guts of the incremental collection pause, executed by the vm | |
1973 | 740 // thread. It returns false if it is unable to do the collection due |
741 // to the GC locker being active, true otherwise | |
742 bool do_collection_pause_at_safepoint(double target_pause_time_ms); | |
342 | 743 |
744 // Actually do the work of evacuating the collection set. | |
1973 | 745 void evacuate_collection_set(); |
342 | 746 |
747 // The g1 remembered set of the heap. | |
748 G1RemSet* _g1_rem_set; | |
749 // And it's mod ref barrier set, used to track updates for the above. | |
750 ModRefBarrierSet* _mr_bs; | |
751 | |
616
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752 // A set of cards that cover the objects for which the Rsets should be updated |
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753 // concurrently after the collection. |
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754 DirtyCardQueueSet _dirty_card_queue_set; |
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755 |
342 | 756 // The Heap Region Rem Set Iterator. |
757 HeapRegionRemSetIterator** _rem_set_iterator; | |
758 | |
759 // The closure used to refine a single card. | |
760 RefineCardTableEntryClosure* _refine_cte_cl; | |
761 | |
762 // A function to check the consistency of dirty card logs. | |
763 void check_ct_logs_at_safepoint(); | |
764 | |
1705 | 765 // A DirtyCardQueueSet that is used to hold cards that contain |
766 // references into the current collection set. This is used to | |
767 // update the remembered sets of the regions in the collection | |
768 // set in the event of an evacuation failure. | |
769 DirtyCardQueueSet _into_cset_dirty_card_queue_set; | |
770 | |
342 | 771 // After a collection pause, make the regions in the CS into free |
772 // regions. | |
773 void free_collection_set(HeapRegion* cs_head); | |
774 | |
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775 // Abandon the current collection set without recording policy |
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776 // statistics or updating free lists. |
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777 void abandon_collection_set(HeapRegion* cs_head); |
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778 |
342 | 779 // Applies "scan_non_heap_roots" to roots outside the heap, |
780 // "scan_rs" to roots inside the heap (having done "set_region" to | |
781 // indicate the region in which the root resides), and does "scan_perm" | |
782 // (setting the generation to the perm generation.) If "scan_rs" is | |
783 // NULL, then this step is skipped. The "worker_i" | |
784 // param is for use with parallel roots processing, and should be | |
785 // the "i" of the calling parallel worker thread's work(i) function. | |
786 // In the sequential case this param will be ignored. | |
787 void g1_process_strong_roots(bool collecting_perm_gen, | |
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788 ScanningOption so, |
342 | 789 OopClosure* scan_non_heap_roots, |
790 OopsInHeapRegionClosure* scan_rs, | |
791 OopsInGenClosure* scan_perm, | |
792 int worker_i); | |
793 | |
794 // Apply "blk" to all the weak roots of the system. These include | |
795 // JNI weak roots, the code cache, system dictionary, symbol table, | |
796 // string table, and referents of reachable weak refs. | |
797 void g1_process_weak_roots(OopClosure* root_closure, | |
798 OopClosure* non_root_closure); | |
799 | |
2361 | 800 // Frees a non-humongous region by initializing its contents and |
2152 | 801 // adding it to the free list that's passed as a parameter (this is |
802 // usually a local list which will be appended to the master free | |
803 // list later). The used bytes of freed regions are accumulated in | |
804 // pre_used. If par is true, the region's RSet will not be freed | |
805 // up. The assumption is that this will be done later. | |
806 void free_region(HeapRegion* hr, | |
807 size_t* pre_used, | |
808 FreeRegionList* free_list, | |
809 bool par); | |
342 | 810 |
2361 | 811 // Frees a humongous region by collapsing it into individual regions |
812 // and calling free_region() for each of them. The freed regions | |
813 // will be added to the free list that's passed as a parameter (this | |
814 // is usually a local list which will be appended to the master free | |
815 // list later). The used bytes of freed regions are accumulated in | |
816 // pre_used. If par is true, the region's RSet will not be freed | |
817 // up. The assumption is that this will be done later. | |
2152 | 818 void free_humongous_region(HeapRegion* hr, |
819 size_t* pre_used, | |
820 FreeRegionList* free_list, | |
821 HumongousRegionSet* humongous_proxy_set, | |
822 bool par); | |
342 | 823 |
3766 | 824 // Notifies all the necessary spaces that the committed space has |
825 // been updated (either expanded or shrunk). It should be called | |
826 // after _g1_storage is updated. | |
827 void update_committed_space(HeapWord* old_end, HeapWord* new_end); | |
828 | |
342 | 829 // The concurrent marker (and the thread it runs in.) |
830 ConcurrentMark* _cm; | |
831 ConcurrentMarkThread* _cmThread; | |
832 bool _mark_in_progress; | |
833 | |
834 // The concurrent refiner. | |
835 ConcurrentG1Refine* _cg1r; | |
836 | |
837 // The parallel task queues | |
838 RefToScanQueueSet *_task_queues; | |
839 | |
840 // True iff a evacuation has failed in the current collection. | |
841 bool _evacuation_failed; | |
842 | |
843 // Set the attribute indicating whether evacuation has failed in the | |
844 // current collection. | |
845 void set_evacuation_failed(bool b) { _evacuation_failed = b; } | |
846 | |
847 // Failed evacuations cause some logical from-space objects to have | |
848 // forwarding pointers to themselves. Reset them. | |
849 void remove_self_forwarding_pointers(); | |
850 | |
851 // When one is non-null, so is the other. Together, they each pair is | |
852 // an object with a preserved mark, and its mark value. | |
853 GrowableArray<oop>* _objs_with_preserved_marks; | |
854 GrowableArray<markOop>* _preserved_marks_of_objs; | |
855 | |
856 // Preserve the mark of "obj", if necessary, in preparation for its mark | |
857 // word being overwritten with a self-forwarding-pointer. | |
858 void preserve_mark_if_necessary(oop obj, markOop m); | |
859 | |
860 // The stack of evac-failure objects left to be scanned. | |
861 GrowableArray<oop>* _evac_failure_scan_stack; | |
862 // The closure to apply to evac-failure objects. | |
863 | |
864 OopsInHeapRegionClosure* _evac_failure_closure; | |
865 // Set the field above. | |
866 void | |
867 set_evac_failure_closure(OopsInHeapRegionClosure* evac_failure_closure) { | |
868 _evac_failure_closure = evac_failure_closure; | |
869 } | |
870 | |
871 // Push "obj" on the scan stack. | |
872 void push_on_evac_failure_scan_stack(oop obj); | |
873 // Process scan stack entries until the stack is empty. | |
874 void drain_evac_failure_scan_stack(); | |
875 // True iff an invocation of "drain_scan_stack" is in progress; to | |
876 // prevent unnecessary recursion. | |
877 bool _drain_in_progress; | |
878 | |
879 // Do any necessary initialization for evacuation-failure handling. | |
880 // "cl" is the closure that will be used to process evac-failure | |
881 // objects. | |
882 void init_for_evac_failure(OopsInHeapRegionClosure* cl); | |
883 // Do any necessary cleanup for evacuation-failure handling data | |
884 // structures. | |
885 void finalize_for_evac_failure(); | |
886 | |
887 // An attempt to evacuate "obj" has failed; take necessary steps. | |
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888 oop handle_evacuation_failure_par(OopsInHeapRegionClosure* cl, oop obj); |
342 | 889 void handle_evacuation_failure_common(oop obj, markOop m); |
890 | |
3979
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891 // ("Weak") Reference processing support. |
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892 // |
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893 // G1 has 2 instances of the referece processor class. One |
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894 // (_ref_processor_cm) handles reference object discovery |
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895 // and subsequent processing during concurrent marking cycles. |
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896 // |
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897 // The other (_ref_processor_stw) handles reference object |
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898 // discovery and processing during full GCs and incremental |
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899 // evacuation pauses. |
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900 // |
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901 // During an incremental pause, reference discovery will be |
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902 // temporarily disabled for _ref_processor_cm and will be |
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903 // enabled for _ref_processor_stw. At the end of the evacuation |
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904 // pause references discovered by _ref_processor_stw will be |
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905 // processed and discovery will be disabled. The previous |
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906 // setting for reference object discovery for _ref_processor_cm |
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907 // will be re-instated. |
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|
908 // |
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909 // At the start of marking: |
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910 // * Discovery by the CM ref processor is verified to be inactive |
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911 // and it's discovered lists are empty. |
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912 // * Discovery by the CM ref processor is then enabled. |
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913 // |
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914 // At the end of marking: |
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915 // * Any references on the CM ref processor's discovered |
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916 // lists are processed (possibly MT). |
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917 // |
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918 // At the start of full GC we: |
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919 // * Disable discovery by the CM ref processor and |
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920 // empty CM ref processor's discovered lists |
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921 // (without processing any entries). |
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922 // * Verify that the STW ref processor is inactive and it's |
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923 // discovered lists are empty. |
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924 // * Temporarily set STW ref processor discovery as single threaded. |
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925 // * Temporarily clear the STW ref processor's _is_alive_non_header |
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926 // field. |
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927 // * Finally enable discovery by the STW ref processor. |
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928 // |
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929 // The STW ref processor is used to record any discovered |
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930 // references during the full GC. |
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931 // |
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932 // At the end of a full GC we: |
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933 // * Enqueue any reference objects discovered by the STW ref processor |
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934 // that have non-live referents. This has the side-effect of |
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935 // making the STW ref processor inactive by disabling discovery. |
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936 // * Verify that the CM ref processor is still inactive |
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937 // and no references have been placed on it's discovered |
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938 // lists (also checked as a precondition during initial marking). |
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939 |
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940 // The (stw) reference processor... |
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941 ReferenceProcessor* _ref_processor_stw; |
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942 |
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943 // During reference object discovery, the _is_alive_non_header |
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944 // closure (if non-null) is applied to the referent object to |
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945 // determine whether the referent is live. If so then the |
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946 // reference object does not need to be 'discovered' and can |
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947 // be treated as a regular oop. This has the benefit of reducing |
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948 // the number of 'discovered' reference objects that need to |
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949 // be processed. |
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950 // |
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951 // Instance of the is_alive closure for embedding into the |
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952 // STW reference processor as the _is_alive_non_header field. |
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953 // Supplying a value for the _is_alive_non_header field is |
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954 // optional but doing so prevents unnecessary additions to |
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955 // the discovered lists during reference discovery. |
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956 G1STWIsAliveClosure _is_alive_closure_stw; |
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957 |
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958 // The (concurrent marking) reference processor... |
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959 ReferenceProcessor* _ref_processor_cm; |
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960 |
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961 // Instance of the concurrent mark is_alive closure for embedding |
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962 // into the Concurrent Marking reference processor as the |
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963 // _is_alive_non_header field. Supplying a value for the |
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964 // _is_alive_non_header field is optional but doing so prevents |
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965 // unnecessary additions to the discovered lists during reference |
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966 // discovery. |
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967 G1CMIsAliveClosure _is_alive_closure_cm; |
342 | 968 |
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969 // Cache used by G1CollectedHeap::start_cset_region_for_worker(). |
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970 HeapRegion** _worker_cset_start_region; |
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971 |
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972 // Time stamp to validate the regions recorded in the cache |
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973 // used by G1CollectedHeap::start_cset_region_for_worker(). |
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974 // The heap region entry for a given worker is valid iff |
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975 // the associated time stamp value matches the current value |
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976 // of G1CollectedHeap::_gc_time_stamp. |
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977 unsigned int* _worker_cset_start_region_time_stamp; |
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978 |
342 | 979 enum G1H_process_strong_roots_tasks { |
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980 G1H_PS_filter_satb_buffers, |
342 | 981 G1H_PS_refProcessor_oops_do, |
982 // Leave this one last. | |
983 G1H_PS_NumElements | |
984 }; | |
985 | |
986 SubTasksDone* _process_strong_tasks; | |
987 | |
2152 | 988 volatile bool _free_regions_coming; |
342 | 989 |
990 public: | |
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991 |
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992 SubTasksDone* process_strong_tasks() { return _process_strong_tasks; } |
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993 |
342 | 994 void set_refine_cte_cl_concurrency(bool concurrent); |
995 | |
1709 | 996 RefToScanQueue *task_queue(int i) const; |
342 | 997 |
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998 // A set of cards where updates happened during the GC |
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999 DirtyCardQueueSet& dirty_card_queue_set() { return _dirty_card_queue_set; } |
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1000 |
1705 | 1001 // A DirtyCardQueueSet that is used to hold cards that contain |
1002 // references into the current collection set. This is used to | |
1003 // update the remembered sets of the regions in the collection | |
1004 // set in the event of an evacuation failure. | |
1005 DirtyCardQueueSet& into_cset_dirty_card_queue_set() | |
1006 { return _into_cset_dirty_card_queue_set; } | |
1007 | |
342 | 1008 // Create a G1CollectedHeap with the specified policy. |
1009 // Must call the initialize method afterwards. | |
1010 // May not return if something goes wrong. | |
1011 G1CollectedHeap(G1CollectorPolicy* policy); | |
1012 | |
1013 // Initialize the G1CollectedHeap to have the initial and | |
1014 // maximum sizes, permanent generation, and remembered and barrier sets | |
1015 // specified by the policy object. | |
1016 jint initialize(); | |
1017 | |
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1018 // Initialize weak reference processing. |
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1019 virtual void ref_processing_init(); |
342 | 1020 |
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1021 void set_par_threads(uint t) { |
342 | 1022 SharedHeap::set_par_threads(t); |
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1023 // Done in SharedHeap but oddly there are |
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1024 // two _process_strong_tasks's in a G1CollectedHeap |
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1025 // so do it here too. |
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1026 _process_strong_tasks->set_n_threads(t); |
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1027 } |
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1028 |
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1029 // Set _n_par_threads according to a policy TBD. |
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1030 void set_par_threads(); |
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1031 |
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1032 void set_n_termination(int t) { |
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1033 _process_strong_tasks->set_n_threads(t); |
342 | 1034 } |
1035 | |
1036 virtual CollectedHeap::Name kind() const { | |
1037 return CollectedHeap::G1CollectedHeap; | |
1038 } | |
1039 | |
1040 // The current policy object for the collector. | |
1041 G1CollectorPolicy* g1_policy() const { return _g1_policy; } | |
1042 | |
1043 // Adaptive size policy. No such thing for g1. | |
1044 virtual AdaptiveSizePolicy* size_policy() { return NULL; } | |
1045 | |
1046 // The rem set and barrier set. | |
1047 G1RemSet* g1_rem_set() const { return _g1_rem_set; } | |
1048 ModRefBarrierSet* mr_bs() const { return _mr_bs; } | |
1049 | |
1050 // The rem set iterator. | |
1051 HeapRegionRemSetIterator* rem_set_iterator(int i) { | |
1052 return _rem_set_iterator[i]; | |
1053 } | |
1054 | |
1055 HeapRegionRemSetIterator* rem_set_iterator() { | |
1056 return _rem_set_iterator[0]; | |
1057 } | |
1058 | |
1059 unsigned get_gc_time_stamp() { | |
1060 return _gc_time_stamp; | |
1061 } | |
1062 | |
1063 void reset_gc_time_stamp() { | |
1064 _gc_time_stamp = 0; | |
353
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1065 OrderAccess::fence(); |
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1066 // Clear the cached CSet starting regions and time stamps. |
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1067 // Their validity is dependent on the GC timestamp. |
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1068 clear_cset_start_regions(); |
353
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1069 } |
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1070 |
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1071 void check_gc_time_stamps() PRODUCT_RETURN; |
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1072 |
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1073 void increment_gc_time_stamp() { |
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1074 ++_gc_time_stamp; |
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1075 OrderAccess::fence(); |
342 | 1076 } |
1077 | |
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1078 // Reset the given region's GC timestamp. If it's starts humongous, |
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1079 // also reset the GC timestamp of its corresponding |
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1080 // continues humongous regions too. |
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1081 void reset_gc_time_stamps(HeapRegion* hr); |
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1082 |
1705 | 1083 void iterate_dirty_card_closure(CardTableEntryClosure* cl, |
1084 DirtyCardQueue* into_cset_dcq, | |
1085 bool concurrent, int worker_i); | |
342 | 1086 |
1087 // The shared block offset table array. | |
1088 G1BlockOffsetSharedArray* bot_shared() const { return _bot_shared; } | |
1089 | |
3979
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1090 // Reference Processing accessors |
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1091 |
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1092 // The STW reference processor.... |
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1093 ReferenceProcessor* ref_processor_stw() const { return _ref_processor_stw; } |
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1094 |
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1095 // The Concurent Marking reference processor... |
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1096 ReferenceProcessor* ref_processor_cm() const { return _ref_processor_cm; } |
342 | 1097 |
1098 virtual size_t capacity() const; | |
1099 virtual size_t used() const; | |
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1100 // This should be called when we're not holding the heap lock. The |
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1101 // result might be a bit inaccurate. |
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1102 size_t used_unlocked() const; |
342 | 1103 size_t recalculate_used() const; |
1104 | |
1105 // These virtual functions do the actual allocation. | |
1106 // Some heaps may offer a contiguous region for shared non-blocking | |
1107 // allocation, via inlined code (by exporting the address of the top and | |
1108 // end fields defining the extent of the contiguous allocation region.) | |
1109 // But G1CollectedHeap doesn't yet support this. | |
1110 | |
1111 // Return an estimate of the maximum allocation that could be performed | |
1112 // without triggering any collection or expansion activity. In a | |
1113 // generational collector, for example, this is probably the largest | |
1114 // allocation that could be supported (without expansion) in the youngest | |
1115 // generation. It is "unsafe" because no locks are taken; the result | |
1116 // should be treated as an approximation, not a guarantee, for use in | |
1117 // heuristic resizing decisions. | |
1118 virtual size_t unsafe_max_alloc(); | |
1119 | |
1120 virtual bool is_maximal_no_gc() const { | |
1121 return _g1_storage.uncommitted_size() == 0; | |
1122 } | |
1123 | |
1124 // The total number of regions in the heap. | |
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1125 uint n_regions() { return _hrs.length(); } |
3766 | 1126 |
1127 // The max number of regions in the heap. | |
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1128 uint max_regions() { return _hrs.max_length(); } |
342 | 1129 |
1130 // The number of regions that are completely free. | |
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1131 uint free_regions() { return _free_list.length(); } |
342 | 1132 |
1133 // The number of regions that are not completely free. | |
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1134 uint used_regions() { return n_regions() - free_regions(); } |
342 | 1135 |
1136 // The number of regions available for "regular" expansion. | |
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1137 uint expansion_regions() { return _expansion_regions; } |
342 | 1138 |
3766 | 1139 // Factory method for HeapRegion instances. It will return NULL if |
1140 // the allocation fails. | |
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1141 HeapRegion* new_heap_region(uint hrs_index, HeapWord* bottom); |
3766 | 1142 |
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1143 void verify_not_dirty_region(HeapRegion* hr) PRODUCT_RETURN; |
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1144 void verify_dirty_region(HeapRegion* hr) PRODUCT_RETURN; |
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1145 void verify_dirty_young_list(HeapRegion* head) PRODUCT_RETURN; |
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1146 void verify_dirty_young_regions() PRODUCT_RETURN; |
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1147 |
2152 | 1148 // verify_region_sets() performs verification over the region |
1149 // lists. It will be compiled in the product code to be used when | |
1150 // necessary (i.e., during heap verification). | |
1151 void verify_region_sets(); | |
342 | 1152 |
2152 | 1153 // verify_region_sets_optional() is planted in the code for |
1154 // list verification in non-product builds (and it can be enabled in | |
1155 // product builds by definning HEAP_REGION_SET_FORCE_VERIFY to be 1). | |
1156 #if HEAP_REGION_SET_FORCE_VERIFY | |
1157 void verify_region_sets_optional() { | |
1158 verify_region_sets(); | |
1159 } | |
1160 #else // HEAP_REGION_SET_FORCE_VERIFY | |
1161 void verify_region_sets_optional() { } | |
1162 #endif // HEAP_REGION_SET_FORCE_VERIFY | |
342 | 1163 |
2152 | 1164 #ifdef ASSERT |
2361 | 1165 bool is_on_master_free_list(HeapRegion* hr) { |
2152 | 1166 return hr->containing_set() == &_free_list; |
1167 } | |
342 | 1168 |
2361 | 1169 bool is_in_humongous_set(HeapRegion* hr) { |
2152 | 1170 return hr->containing_set() == &_humongous_set; |
2361 | 1171 } |
2152 | 1172 #endif // ASSERT |
342 | 1173 |
2152 | 1174 // Wrapper for the region list operations that can be called from |
1175 // methods outside this class. | |
342 | 1176 |
2152 | 1177 void secondary_free_list_add_as_tail(FreeRegionList* list) { |
1178 _secondary_free_list.add_as_tail(list); | |
1179 } | |
342 | 1180 |
2152 | 1181 void append_secondary_free_list() { |
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1182 _free_list.add_as_head(&_secondary_free_list); |
2152 | 1183 } |
342 | 1184 |
2361 | 1185 void append_secondary_free_list_if_not_empty_with_lock() { |
1186 // If the secondary free list looks empty there's no reason to | |
1187 // take the lock and then try to append it. | |
2152 | 1188 if (!_secondary_free_list.is_empty()) { |
1189 MutexLockerEx x(SecondaryFreeList_lock, Mutex::_no_safepoint_check_flag); | |
1190 append_secondary_free_list(); | |
1191 } | |
1192 } | |
342 | 1193 |
4072 | 1194 void old_set_remove(HeapRegion* hr) { |
1195 _old_set.remove(hr); | |
1196 } | |
1197 | |
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1198 size_t non_young_capacity_bytes() { |
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1199 return _old_set.total_capacity_bytes() + _humongous_set.total_capacity_bytes(); |
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1200 } |
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1201 |
2152 | 1202 void set_free_regions_coming(); |
1203 void reset_free_regions_coming(); | |
1204 bool free_regions_coming() { return _free_regions_coming; } | |
1205 void wait_while_free_regions_coming(); | |
342 | 1206 |
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1207 // Determine whether the given region is one that we are using as an |
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1208 // old GC alloc region. |
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1209 bool is_old_gc_alloc_region(HeapRegion* hr) { |
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1210 return hr == _retained_old_gc_alloc_region; |
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1211 } |
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1212 |
342 | 1213 // Perform a collection of the heap; intended for use in implementing |
1214 // "System.gc". This probably implies as full a collection as the | |
1215 // "CollectedHeap" supports. | |
1216 virtual void collect(GCCause::Cause cause); | |
1217 | |
1218 // The same as above but assume that the caller holds the Heap_lock. | |
1219 void collect_locked(GCCause::Cause cause); | |
1220 | |
1221 // This interface assumes that it's being called by the | |
1222 // vm thread. It collects the heap assuming that the | |
1223 // heap lock is already held and that we are executing in | |
1224 // the context of the vm thread. | |
1225 virtual void collect_as_vm_thread(GCCause::Cause cause); | |
1226 | |
1227 // True iff a evacuation has failed in the most-recent collection. | |
1228 bool evacuation_failed() { return _evacuation_failed; } | |
1229 | |
2152 | 1230 // It will free a region if it has allocated objects in it that are |
1231 // all dead. It calls either free_region() or | |
1232 // free_humongous_region() depending on the type of the region that | |
1233 // is passed to it. | |
2173 | 1234 void free_region_if_empty(HeapRegion* hr, |
1235 size_t* pre_used, | |
1236 FreeRegionList* free_list, | |
4072 | 1237 OldRegionSet* old_proxy_set, |
2173 | 1238 HumongousRegionSet* humongous_proxy_set, |
1239 HRRSCleanupTask* hrrs_cleanup_task, | |
1240 bool par); | |
342 | 1241 |
2152 | 1242 // It appends the free list to the master free list and updates the |
1243 // master humongous list according to the contents of the proxy | |
1244 // list. It also adjusts the total used bytes according to pre_used | |
1245 // (if par is true, it will do so by taking the ParGCRareEvent_lock). | |
1246 void update_sets_after_freeing_regions(size_t pre_used, | |
1247 FreeRegionList* free_list, | |
4072 | 1248 OldRegionSet* old_proxy_set, |
2152 | 1249 HumongousRegionSet* humongous_proxy_set, |
1250 bool par); | |
342 | 1251 |
4708 | 1252 // Returns "TRUE" iff "p" points into the committed areas of the heap. |
342 | 1253 virtual bool is_in(const void* p) const; |
1254 | |
1255 // Return "TRUE" iff the given object address is within the collection | |
1256 // set. | |
1257 inline bool obj_in_cs(oop obj); | |
1258 | |
1259 // Return "TRUE" iff the given object address is in the reserved | |
1260 // region of g1 (excluding the permanent generation). | |
1261 bool is_in_g1_reserved(const void* p) const { | |
1262 return _g1_reserved.contains(p); | |
1263 } | |
1264 | |
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1265 // Returns a MemRegion that corresponds to the space that has been |
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1266 // reserved for the heap |
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1267 MemRegion g1_reserved() { |
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1268 return _g1_reserved; |
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1269 } |
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1270 |
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1271 // Returns a MemRegion that corresponds to the space that has been |
342 | 1272 // committed in the heap |
1273 MemRegion g1_committed() { | |
1274 return _g1_committed; | |
1275 } | |
1276 | |
2311 | 1277 virtual bool is_in_closed_subset(const void* p) const; |
342 | 1278 |
1279 // This resets the card table to all zeros. It is used after | |
1280 // a collection pause which used the card table to claim cards. | |
1281 void cleanUpCardTable(); | |
1282 | |
1283 // Iteration functions. | |
1284 | |
1285 // Iterate over all the ref-containing fields of all objects, calling | |
1286 // "cl.do_oop" on each. | |
678 | 1287 virtual void oop_iterate(OopClosure* cl) { |
1288 oop_iterate(cl, true); | |
1289 } | |
1290 void oop_iterate(OopClosure* cl, bool do_perm); | |
342 | 1291 |
1292 // Same as above, restricted to a memory region. | |
678 | 1293 virtual void oop_iterate(MemRegion mr, OopClosure* cl) { |
1294 oop_iterate(mr, cl, true); | |
1295 } | |
1296 void oop_iterate(MemRegion mr, OopClosure* cl, bool do_perm); | |
342 | 1297 |
1298 // Iterate over all objects, calling "cl.do_object" on each. | |
678 | 1299 virtual void object_iterate(ObjectClosure* cl) { |
1300 object_iterate(cl, true); | |
1301 } | |
1302 virtual void safe_object_iterate(ObjectClosure* cl) { | |
1303 object_iterate(cl, true); | |
1304 } | |
1305 void object_iterate(ObjectClosure* cl, bool do_perm); | |
342 | 1306 |
1307 // Iterate over all objects allocated since the last collection, calling | |
1308 // "cl.do_object" on each. The heap must have been initialized properly | |
1309 // to support this function, or else this call will fail. | |
1310 virtual void object_iterate_since_last_GC(ObjectClosure* cl); | |
1311 | |
1312 // Iterate over all spaces in use in the heap, in ascending address order. | |
1313 virtual void space_iterate(SpaceClosure* cl); | |
1314 | |
1315 // Iterate over heap regions, in address order, terminating the | |
1316 // iteration early if the "doHeapRegion" method returns "true". | |
3766 | 1317 void heap_region_iterate(HeapRegionClosure* blk) const; |
342 | 1318 |
3766 | 1319 // Return the region with the given index. It assumes the index is valid. |
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1320 HeapRegion* region_at(uint index) const { return _hrs.at(index); } |
342 | 1321 |
1322 // Divide the heap region sequence into "chunks" of some size (the number | |
1323 // of regions divided by the number of parallel threads times some | |
1324 // overpartition factor, currently 4). Assumes that this will be called | |
1325 // in parallel by ParallelGCThreads worker threads with discinct worker | |
1326 // ids in the range [0..max(ParallelGCThreads-1, 1)], that all parallel | |
1327 // calls will use the same "claim_value", and that that claim value is | |
1328 // different from the claim_value of any heap region before the start of | |
1329 // the iteration. Applies "blk->doHeapRegion" to each of the regions, by | |
1330 // attempting to claim the first region in each chunk, and, if | |
1331 // successful, applying the closure to each region in the chunk (and | |
1332 // setting the claim value of the second and subsequent regions of the | |
1333 // chunk.) For now requires that "doHeapRegion" always returns "false", | |
1334 // i.e., that a closure never attempt to abort a traversal. | |
1335 void heap_region_par_iterate_chunked(HeapRegionClosure* blk, | |
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1336 uint worker, |
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1337 uint no_of_par_workers, |
342 | 1338 jint claim_value); |
1339 | |
390 | 1340 // It resets all the region claim values to the default. |
1341 void reset_heap_region_claim_values(); | |
1342 | |
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1343 // Resets the claim values of regions in the current |
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1344 // collection set to the default. |
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1345 void reset_cset_heap_region_claim_values(); |
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1346 |
355 | 1347 #ifdef ASSERT |
1348 bool check_heap_region_claim_values(jint claim_value); | |
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1349 |
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1350 // Same as the routine above but only checks regions in the |
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1351 // current collection set. |
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1352 bool check_cset_heap_region_claim_values(jint claim_value); |
355 | 1353 #endif // ASSERT |
1354 | |
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1355 // Clear the cached cset start regions and (more importantly) |
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1356 // the time stamps. Called when we reset the GC time stamp. |
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1357 void clear_cset_start_regions(); |
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1358 |
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1359 // Given the id of a worker, obtain or calculate a suitable |
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1360 // starting region for iterating over the current collection set. |
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1361 HeapRegion* start_cset_region_for_worker(int worker_i); |
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1362 |
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1363 // This is a convenience method that is used by the |
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1364 // HeapRegionIterator classes to calculate the starting region for |
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1365 // each worker so that they do not all start from the same region. |
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1366 HeapRegion* start_region_for_worker(uint worker_i, uint no_of_par_workers); |
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1367 |
342 | 1368 // Iterate over the regions (if any) in the current collection set. |
1369 void collection_set_iterate(HeapRegionClosure* blk); | |
1370 | |
1371 // As above but starting from region r | |
1372 void collection_set_iterate_from(HeapRegion* r, HeapRegionClosure *blk); | |
1373 | |
1374 // Returns the first (lowest address) compactible space in the heap. | |
1375 virtual CompactibleSpace* first_compactible_space(); | |
1376 | |
1377 // A CollectedHeap will contain some number of spaces. This finds the | |
1378 // space containing a given address, or else returns NULL. | |
1379 virtual Space* space_containing(const void* addr) const; | |
1380 | |
1381 // A G1CollectedHeap will contain some number of heap regions. This | |
1382 // finds the region containing a given address, or else returns NULL. | |
3766 | 1383 template <class T> |
1384 inline HeapRegion* heap_region_containing(const T addr) const; | |
342 | 1385 |
1386 // Like the above, but requires "addr" to be in the heap (to avoid a | |
1387 // null-check), and unlike the above, may return an continuing humongous | |
1388 // region. | |
3766 | 1389 template <class T> |
1390 inline HeapRegion* heap_region_containing_raw(const T addr) const; | |
342 | 1391 |
1392 // A CollectedHeap is divided into a dense sequence of "blocks"; that is, | |
1393 // each address in the (reserved) heap is a member of exactly | |
1394 // one block. The defining characteristic of a block is that it is | |
1395 // possible to find its size, and thus to progress forward to the next | |
1396 // block. (Blocks may be of different sizes.) Thus, blocks may | |
1397 // represent Java objects, or they might be free blocks in a | |
1398 // free-list-based heap (or subheap), as long as the two kinds are | |
1399 // distinguishable and the size of each is determinable. | |
1400 | |
1401 // Returns the address of the start of the "block" that contains the | |
1402 // address "addr". We say "blocks" instead of "object" since some heaps | |
1403 // may not pack objects densely; a chunk may either be an object or a | |
1404 // non-object. | |
1405 virtual HeapWord* block_start(const void* addr) const; | |
1406 | |
1407 // Requires "addr" to be the start of a chunk, and returns its size. | |
1408 // "addr + size" is required to be the start of a new chunk, or the end | |
1409 // of the active area of the heap. | |
1410 virtual size_t block_size(const HeapWord* addr) const; | |
1411 | |
1412 // Requires "addr" to be the start of a block, and returns "TRUE" iff | |
1413 // the block is an object. | |
1414 virtual bool block_is_obj(const HeapWord* addr) const; | |
1415 | |
1416 // Does this heap support heap inspection? (+PrintClassHistogram) | |
1417 virtual bool supports_heap_inspection() const { return true; } | |
1418 | |
1419 // Section on thread-local allocation buffers (TLABs) | |
1420 // See CollectedHeap for semantics. | |
1421 | |
1422 virtual bool supports_tlab_allocation() const; | |
1423 virtual size_t tlab_capacity(Thread* thr) const; | |
1424 virtual size_t unsafe_max_tlab_alloc(Thread* thr) const; | |
1425 | |
1426 // Can a compiler initialize a new object without store barriers? | |
1427 // This permission only extends from the creation of a new object | |
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1428 // via a TLAB up to the first subsequent safepoint. If such permission |
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1429 // is granted for this heap type, the compiler promises to call |
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1430 // defer_store_barrier() below on any slow path allocation of |
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1431 // a new object for which such initializing store barriers will |
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1432 // have been elided. G1, like CMS, allows this, but should be |
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1433 // ready to provide a compensating write barrier as necessary |
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1434 // if that storage came out of a non-young region. The efficiency |
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1435 // of this implementation depends crucially on being able to |
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1436 // answer very efficiently in constant time whether a piece of |
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1437 // storage in the heap comes from a young region or not. |
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1438 // See ReduceInitialCardMarks. |
342 | 1439 virtual bool can_elide_tlab_store_barriers() const { |
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1440 return true; |
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1441 } |
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1442 |
1166 | 1443 virtual bool card_mark_must_follow_store() const { |
1444 return true; | |
1445 } | |
1446 | |
3766 | 1447 bool is_in_young(const oop obj) { |
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1448 HeapRegion* hr = heap_region_containing(obj); |
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1449 return hr != NULL && hr->is_young(); |
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1450 } |
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1451 |
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1452 #ifdef ASSERT |
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1453 virtual bool is_in_partial_collection(const void* p); |
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1454 #endif |
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1455 |
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1456 virtual bool is_scavengable(const void* addr); |
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1457 |
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1458 // We don't need barriers for initializing stores to objects |
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1459 // in the young gen: for the SATB pre-barrier, there is no |
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1460 // pre-value that needs to be remembered; for the remembered-set |
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1461 // update logging post-barrier, we don't maintain remembered set |
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1462 // information for young gen objects. |
1027
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1463 virtual bool can_elide_initializing_store_barrier(oop new_obj) { |
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1464 return is_in_young(new_obj); |
342 | 1465 } |
1466 | |
1467 // Can a compiler elide a store barrier when it writes | |
1468 // a permanent oop into the heap? Applies when the compiler | |
1469 // is storing x to the heap, where x->is_perm() is true. | |
1470 virtual bool can_elide_permanent_oop_store_barriers() const { | |
1471 // At least until perm gen collection is also G1-ified, at | |
1472 // which point this should return false. | |
1473 return true; | |
1474 } | |
1475 | |
1476 // Returns "true" iff the given word_size is "very large". | |
1477 static bool isHumongous(size_t word_size) { | |
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1478 // Note this has to be strictly greater-than as the TLABs |
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1479 // are capped at the humongous thresold and we want to |
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1480 // ensure that we don't try to allocate a TLAB as |
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1481 // humongous and that we don't allocate a humongous |
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1482 // object in a TLAB. |
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1483 return word_size > _humongous_object_threshold_in_words; |
342 | 1484 } |
1485 | |
1486 // Update mod union table with the set of dirty cards. | |
1487 void updateModUnion(); | |
1488 | |
1489 // Set the mod union bits corresponding to the given memRegion. Note | |
1490 // that this is always a safe operation, since it doesn't clear any | |
1491 // bits. | |
1492 void markModUnionRange(MemRegion mr); | |
1493 | |
1494 // Records the fact that a marking phase is no longer in progress. | |
1495 void set_marking_complete() { | |
1496 _mark_in_progress = false; | |
1497 } | |
1498 void set_marking_started() { | |
1499 _mark_in_progress = true; | |
1500 } | |
1501 bool mark_in_progress() { | |
1502 return _mark_in_progress; | |
1503 } | |
1504 | |
1505 // Print the maximum heap capacity. | |
1506 virtual size_t max_capacity() const; | |
1507 | |
1508 virtual jlong millis_since_last_gc(); | |
1509 | |
1510 // Perform any cleanup actions necessary before allowing a verification. | |
1511 virtual void prepare_for_verify(); | |
1512 | |
1513 // Perform verification. | |
811 | 1514 |
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1515 // vo == UsePrevMarking -> use "prev" marking information, |
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1516 // vo == UseNextMarking -> use "next" marking information |
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1517 // vo == UseMarkWord -> use the mark word in the object header |
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1518 // |
811 | 1519 // NOTE: Only the "prev" marking information is guaranteed to be |
1520 // consistent most of the time, so most calls to this should use | |
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1521 // vo == UsePrevMarking. |
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1522 // Currently, there is only one case where this is called with |
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1523 // vo == UseNextMarking, which is to verify the "next" marking |
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1524 // information at the end of remark. |
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1525 // Currently there is only one place where this is called with |
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1526 // vo == UseMarkWord, which is to verify the marking during a |
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1527 // full GC. |
6008 | 1528 void verify(bool silent, VerifyOption vo); |
811 | 1529 |
1530 // Override; it uses the "prev" marking information | |
6008 | 1531 virtual void verify(bool silent); |
342 | 1532 virtual void print_on(outputStream* st) const; |
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1533 virtual void print_extended_on(outputStream* st) const; |
342 | 1534 |
1535 virtual void print_gc_threads_on(outputStream* st) const; | |
1536 virtual void gc_threads_do(ThreadClosure* tc) const; | |
1537 | |
1538 // Override | |
1539 void print_tracing_info() const; | |
1540 | |
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1541 // The following two methods are helpful for debugging RSet issues. |
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1542 void print_cset_rsets() PRODUCT_RETURN; |
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1543 void print_all_rsets() PRODUCT_RETURN; |
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1544 |
342 | 1545 // Convenience function to be used in situations where the heap type can be |
1546 // asserted to be this type. | |
1547 static G1CollectedHeap* heap(); | |
1548 | |
1549 void set_region_short_lived_locked(HeapRegion* hr); | |
1550 // add appropriate methods for any other surv rate groups | |
1551 | |
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1552 YoungList* young_list() { return _young_list; } |
342 | 1553 |
1554 // debugging | |
1555 bool check_young_list_well_formed() { | |
1556 return _young_list->check_list_well_formed(); | |
1557 } | |
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1558 |
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1559 bool check_young_list_empty(bool check_heap, |
342 | 1560 bool check_sample = true); |
1561 | |
1562 // *** Stuff related to concurrent marking. It's not clear to me that so | |
1563 // many of these need to be public. | |
1564 | |
1565 // The functions below are helper functions that a subclass of | |
1566 // "CollectedHeap" can use in the implementation of its virtual | |
1567 // functions. | |
1568 // This performs a concurrent marking of the live objects in a | |
1569 // bitmap off to the side. | |
1570 void doConcurrentMark(); | |
1571 | |
1572 bool isMarkedPrev(oop obj) const; | |
1573 bool isMarkedNext(oop obj) const; | |
1574 | |
1575 // Determine if an object is dead, given the object and also | |
1576 // the region to which the object belongs. An object is dead | |
1577 // iff a) it was not allocated since the last mark and b) it | |
1578 // is not marked. | |
1579 | |
1580 bool is_obj_dead(const oop obj, const HeapRegion* hr) const { | |
1581 return | |
1582 !hr->obj_allocated_since_prev_marking(obj) && | |
1583 !isMarkedPrev(obj); | |
1584 } | |
1585 | |
1586 // This function returns true when an object has been | |
1587 // around since the previous marking and hasn't yet | |
1588 // been marked during this marking. | |
1589 | |
1590 bool is_obj_ill(const oop obj, const HeapRegion* hr) const { | |
1591 return | |
1592 !hr->obj_allocated_since_next_marking(obj) && | |
1593 !isMarkedNext(obj); | |
1594 } | |
1595 | |
1596 // Determine if an object is dead, given only the object itself. | |
1597 // This will find the region to which the object belongs and | |
1598 // then call the region version of the same function. | |
1599 | |
1600 // Added if it is in permanent gen it isn't dead. | |
1601 // Added if it is NULL it isn't dead. | |
1602 | |
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1603 bool is_obj_dead(const oop obj) const { |
811 | 1604 const HeapRegion* hr = heap_region_containing(obj); |
342 | 1605 if (hr == NULL) { |
1606 if (Universe::heap()->is_in_permanent(obj)) | |
1607 return false; | |
1608 else if (obj == NULL) return false; | |
1609 else return true; | |
1610 } | |
1611 else return is_obj_dead(obj, hr); | |
1612 } | |
1613 | |
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1614 bool is_obj_ill(const oop obj) const { |
811 | 1615 const HeapRegion* hr = heap_region_containing(obj); |
342 | 1616 if (hr == NULL) { |
1617 if (Universe::heap()->is_in_permanent(obj)) | |
1618 return false; | |
1619 else if (obj == NULL) return false; | |
1620 else return true; | |
1621 } | |
1622 else return is_obj_ill(obj, hr); | |
1623 } | |
1624 | |
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1625 // The methods below are here for convenience and dispatch the |
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1626 // appropriate method depending on value of the given VerifyOption |
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1627 // parameter. The options for that parameter are: |
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1628 // |
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1629 // vo == UsePrevMarking -> use "prev" marking information, |
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1630 // vo == UseNextMarking -> use "next" marking information, |
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1631 // vo == UseMarkWord -> use mark word from object header |
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1632 |
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1633 bool is_obj_dead_cond(const oop obj, |
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1634 const HeapRegion* hr, |
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1635 const VerifyOption vo) const { |
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1636 switch (vo) { |
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1637 case VerifyOption_G1UsePrevMarking: return is_obj_dead(obj, hr); |
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1638 case VerifyOption_G1UseNextMarking: return is_obj_ill(obj, hr); |
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1639 case VerifyOption_G1UseMarkWord: return !obj->is_gc_marked(); |
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1640 default: ShouldNotReachHere(); |
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1641 } |
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1642 return false; // keep some compilers happy |
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1643 } |
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1644 |
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1645 bool is_obj_dead_cond(const oop obj, |
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1646 const VerifyOption vo) const { |
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1647 switch (vo) { |
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1648 case VerifyOption_G1UsePrevMarking: return is_obj_dead(obj); |
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1649 case VerifyOption_G1UseNextMarking: return is_obj_ill(obj); |
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1650 case VerifyOption_G1UseMarkWord: return !obj->is_gc_marked(); |
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1651 default: ShouldNotReachHere(); |
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1652 } |
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1653 return false; // keep some compilers happy |
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1654 } |
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1655 |
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1656 bool allocated_since_marking(oop obj, HeapRegion* hr, VerifyOption vo); |
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1657 HeapWord* top_at_mark_start(HeapRegion* hr, VerifyOption vo); |
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1658 bool is_marked(oop obj, VerifyOption vo); |
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1659 const char* top_at_mark_start_str(VerifyOption vo); |
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1660 |
342 | 1661 // The following is just to alert the verification code |
1662 // that a full collection has occurred and that the | |
1663 // remembered sets are no longer up to date. | |
1664 bool _full_collection; | |
1665 void set_full_collection() { _full_collection = true;} | |
1666 void clear_full_collection() {_full_collection = false;} | |
1667 bool full_collection() {return _full_collection;} | |
1668 | |
1669 ConcurrentMark* concurrent_mark() const { return _cm; } | |
1670 ConcurrentG1Refine* concurrent_g1_refine() const { return _cg1r; } | |
1671 | |
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1672 // The dirty cards region list is used to record a subset of regions |
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1673 // whose cards need clearing. The list if populated during the |
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1674 // remembered set scanning and drained during the card table |
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1675 // cleanup. Although the methods are reentrant, population/draining |
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1676 // phases must not overlap. For synchronization purposes the last |
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1677 // element on the list points to itself. |
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1678 HeapRegion* _dirty_cards_region_list; |
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1679 void push_dirty_cards_region(HeapRegion* hr); |
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1680 HeapRegion* pop_dirty_cards_region(); |
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1681 |
342 | 1682 public: |
1683 void stop_conc_gc_threads(); | |
1684 | |
1685 size_t pending_card_num(); | |
1686 size_t max_pending_card_num(); | |
1687 size_t cards_scanned(); | |
1688 | |
1689 protected: | |
1690 size_t _max_heap_capacity; | |
1691 }; | |
1692 | |
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1693 class G1ParGCAllocBuffer: public ParGCAllocBuffer { |
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1694 private: |
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1695 bool _retired; |
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1696 |
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1697 public: |
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1698 G1ParGCAllocBuffer(size_t gclab_word_size); |
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1699 |
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1700 void set_buf(HeapWord* buf) { |
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1701 ParGCAllocBuffer::set_buf(buf); |
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1702 _retired = false; |
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1703 } |
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1704 |
4787
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1705 void retire(bool end_of_gc, bool retain) { |
845
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1706 if (_retired) |
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1707 return; |
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1708 ParGCAllocBuffer::retire(end_of_gc, retain); |
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1709 _retired = true; |
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1710 } |
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1711 }; |
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1712 |
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1713 class G1ParScanThreadState : public StackObj { |
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1714 protected: |
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1715 G1CollectedHeap* _g1h; |
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1716 RefToScanQueue* _refs; |
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1717 DirtyCardQueue _dcq; |
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1718 CardTableModRefBS* _ct_bs; |
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1719 G1RemSet* _g1_rem; |
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1720 |
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1721 G1ParGCAllocBuffer _surviving_alloc_buffer; |
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1722 G1ParGCAllocBuffer _tenured_alloc_buffer; |
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1723 G1ParGCAllocBuffer* _alloc_buffers[GCAllocPurposeCount]; |
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1724 ageTable _age_table; |
845
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1725 |
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1726 size_t _alloc_buffer_waste; |
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1727 size_t _undo_waste; |
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1728 |
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1729 OopsInHeapRegionClosure* _evac_failure_cl; |
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1730 G1ParScanHeapEvacClosure* _evac_cl; |
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1731 G1ParScanPartialArrayClosure* _partial_scan_cl; |
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1732 |
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1733 int _hash_seed; |
4836
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1734 uint _queue_num; |
845
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1735 |
1611 | 1736 size_t _term_attempts; |
845
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1737 |
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1738 double _start; |
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1739 double _start_strong_roots; |
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1740 double _strong_roots_time; |
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1741 double _start_term; |
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1742 double _term_time; |
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1743 |
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1744 // Map from young-age-index (0 == not young, 1 is youngest) to |
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1745 // surviving words. base is what we get back from the malloc call |
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1746 size_t* _surviving_young_words_base; |
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1747 // this points into the array, as we use the first few entries for padding |
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1748 size_t* _surviving_young_words; |
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1749 |
1709 | 1750 #define PADDING_ELEM_NUM (DEFAULT_CACHE_LINE_SIZE / sizeof(size_t)) |
845
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1751 |
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1752 void add_to_alloc_buffer_waste(size_t waste) { _alloc_buffer_waste += waste; } |
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1753 |
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1754 void add_to_undo_waste(size_t waste) { _undo_waste += waste; } |
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1755 |
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1756 DirtyCardQueue& dirty_card_queue() { return _dcq; } |
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1757 CardTableModRefBS* ctbs() { return _ct_bs; } |
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1758 |
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1759 template <class T> void immediate_rs_update(HeapRegion* from, T* p, int tid) { |
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1760 if (!from->is_survivor()) { |
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1761 _g1_rem->par_write_ref(from, p, tid); |
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1762 } |
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1763 } |
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1764 |
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1765 template <class T> void deferred_rs_update(HeapRegion* from, T* p, int tid) { |
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1766 // If the new value of the field points to the same region or |
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1767 // is the to-space, we don't need to include it in the Rset updates. |
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1768 if (!from->is_in_reserved(oopDesc::load_decode_heap_oop(p)) && !from->is_survivor()) { |
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1769 size_t card_index = ctbs()->index_for(p); |
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1770 // If the card hasn't been added to the buffer, do it. |
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1771 if (ctbs()->mark_card_deferred(card_index)) { |
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1772 dirty_card_queue().enqueue((jbyte*)ctbs()->byte_for_index(card_index)); |
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1773 } |
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1774 } |
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1775 } |
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1776 |
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1777 public: |
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1778 G1ParScanThreadState(G1CollectedHeap* g1h, uint queue_num); |
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1779 |
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1780 ~G1ParScanThreadState() { |
6197 | 1781 FREE_C_HEAP_ARRAY(size_t, _surviving_young_words_base, mtGC); |
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1782 } |
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1783 |
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1784 RefToScanQueue* refs() { return _refs; } |
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1785 ageTable* age_table() { return &_age_table; } |
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1786 |
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1787 G1ParGCAllocBuffer* alloc_buffer(GCAllocPurpose purpose) { |
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1788 return _alloc_buffers[purpose]; |
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1789 } |
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1790 |
1709 | 1791 size_t alloc_buffer_waste() const { return _alloc_buffer_waste; } |
1792 size_t undo_waste() const { return _undo_waste; } | |
845
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1793 |
1862
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1794 #ifdef ASSERT |
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1795 bool verify_ref(narrowOop* ref) const; |
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1796 bool verify_ref(oop* ref) const; |
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1797 bool verify_task(StarTask ref) const; |
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1798 #endif // ASSERT |
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1799 |
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1800 template <class T> void push_on_queue(T* ref) { |
1862
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1801 assert(verify_ref(ref), "sanity"); |
1709 | 1802 refs()->push(ref); |
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1803 } |
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1804 |
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1805 template <class T> void update_rs(HeapRegion* from, T* p, int tid) { |
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1806 if (G1DeferredRSUpdate) { |
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1807 deferred_rs_update(from, p, tid); |
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1808 } else { |
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1809 immediate_rs_update(from, p, tid); |
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1810 } |
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1811 } |
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1812 |
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1813 HeapWord* allocate_slow(GCAllocPurpose purpose, size_t word_sz) { |
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1814 |
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1815 HeapWord* obj = NULL; |
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1816 size_t gclab_word_size = _g1h->desired_plab_sz(purpose); |
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1817 if (word_sz * 100 < gclab_word_size * ParallelGCBufferWastePct) { |
845
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1818 G1ParGCAllocBuffer* alloc_buf = alloc_buffer(purpose); |
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1819 assert(gclab_word_size == alloc_buf->word_sz(), |
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1820 "dynamic resizing is not supported"); |
845
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1821 add_to_alloc_buffer_waste(alloc_buf->words_remaining()); |
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1822 alloc_buf->retire(false, false); |
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1823 |
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1824 HeapWord* buf = _g1h->par_allocate_during_gc(purpose, gclab_word_size); |
845
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1825 if (buf == NULL) return NULL; // Let caller handle allocation failure. |
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1826 // Otherwise. |
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1827 alloc_buf->set_buf(buf); |
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1828 |
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1829 obj = alloc_buf->allocate(word_sz); |
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1830 assert(obj != NULL, "buffer was definitely big enough..."); |
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1831 } else { |
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1832 obj = _g1h->par_allocate_during_gc(purpose, word_sz); |
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1833 } |
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1834 return obj; |
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1835 } |
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1836 |
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1837 HeapWord* allocate(GCAllocPurpose purpose, size_t word_sz) { |
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1838 HeapWord* obj = alloc_buffer(purpose)->allocate(word_sz); |
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1839 if (obj != NULL) return obj; |
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1840 return allocate_slow(purpose, word_sz); |
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1841 } |
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1842 |
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1843 void undo_allocation(GCAllocPurpose purpose, HeapWord* obj, size_t word_sz) { |
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1844 if (alloc_buffer(purpose)->contains(obj)) { |
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1845 assert(alloc_buffer(purpose)->contains(obj + word_sz - 1), |
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1846 "should contain whole object"); |
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1847 alloc_buffer(purpose)->undo_allocation(obj, word_sz); |
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1848 } else { |
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1849 CollectedHeap::fill_with_object(obj, word_sz); |
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1850 add_to_undo_waste(word_sz); |
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1851 } |
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1852 } |
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1853 |
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1854 void set_evac_failure_closure(OopsInHeapRegionClosure* evac_failure_cl) { |
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1855 _evac_failure_cl = evac_failure_cl; |
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1856 } |
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1857 OopsInHeapRegionClosure* evac_failure_closure() { |
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1858 return _evac_failure_cl; |
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1859 } |
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1860 |
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1861 void set_evac_closure(G1ParScanHeapEvacClosure* evac_cl) { |
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1862 _evac_cl = evac_cl; |
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1863 } |
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1864 |
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1865 void set_partial_scan_closure(G1ParScanPartialArrayClosure* partial_scan_cl) { |
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1866 _partial_scan_cl = partial_scan_cl; |
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1867 } |
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1868 |
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1869 int* hash_seed() { return &_hash_seed; } |
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1870 uint queue_num() { return _queue_num; } |
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1871 |
1709 | 1872 size_t term_attempts() const { return _term_attempts; } |
1611 | 1873 void note_term_attempt() { _term_attempts++; } |
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1874 |
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1875 void start_strong_roots() { |
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1876 _start_strong_roots = os::elapsedTime(); |
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1877 } |
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1878 void end_strong_roots() { |
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1879 _strong_roots_time += (os::elapsedTime() - _start_strong_roots); |
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1880 } |
1709 | 1881 double strong_roots_time() const { return _strong_roots_time; } |
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1882 |
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1883 void start_term_time() { |
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1884 note_term_attempt(); |
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1885 _start_term = os::elapsedTime(); |
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1886 } |
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1887 void end_term_time() { |
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1888 _term_time += (os::elapsedTime() - _start_term); |
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1889 } |
1709 | 1890 double term_time() const { return _term_time; } |
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1891 |
1709 | 1892 double elapsed_time() const { |
845
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1893 return os::elapsedTime() - _start; |
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1894 } |
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1895 |
1709 | 1896 static void |
1897 print_termination_stats_hdr(outputStream* const st = gclog_or_tty); | |
1898 void | |
1899 print_termination_stats(int i, outputStream* const st = gclog_or_tty) const; | |
1900 | |
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1901 size_t* surviving_young_words() { |
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1902 // We add on to hide entry 0 which accumulates surviving words for |
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1903 // age -1 regions (i.e. non-young ones) |
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1904 return _surviving_young_words; |
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1905 } |
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1906 |
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1907 void retire_alloc_buffers() { |
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1908 for (int ap = 0; ap < GCAllocPurposeCount; ++ap) { |
1391
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1909 size_t waste = _alloc_buffers[ap]->words_remaining(); |
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1910 add_to_alloc_buffer_waste(waste); |
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1911 _alloc_buffers[ap]->retire(true, false); |
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1912 } |
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1913 } |
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1914 |
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1915 template <class T> void deal_with_reference(T* ref_to_scan) { |
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1916 if (has_partial_array_mask(ref_to_scan)) { |
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1917 _partial_scan_cl->do_oop_nv(ref_to_scan); |
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1918 } else { |
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1919 // Note: we can use "raw" versions of "region_containing" because |
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1920 // "obj_to_scan" is definitely in the heap, and is not in a |
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1921 // humongous region. |
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1922 HeapRegion* r = _g1h->heap_region_containing_raw(ref_to_scan); |
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1923 _evac_cl->set_region(r); |
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1924 _evac_cl->do_oop_nv(ref_to_scan); |
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1925 } |
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1926 } |
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1927 |
1862
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1928 void deal_with_reference(StarTask ref) { |
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1929 assert(verify_task(ref), "sanity"); |
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1930 if (ref.is_narrow()) { |
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1931 deal_with_reference((narrowOop*)ref); |
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1932 } else { |
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1933 deal_with_reference((oop*)ref); |
845
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1934 } |
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1935 } |
1862
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1936 |
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1937 public: |
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1938 void trim_queue(); |
845
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1939 }; |
1972 | 1940 |
1941 #endif // SHARE_VM_GC_IMPLEMENTATION_G1_G1COLLECTEDHEAP_HPP |